diff options
Diffstat (limited to 'drivers/net/bonding')
| -rw-r--r-- | drivers/net/bonding/Makefile | 12 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_3ad.c | 2770 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_alb.c | 1830 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_debugfs.c | 125 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 5552 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_netlink.c | 785 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_options.c | 1491 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_procfs.c | 312 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_sysfs.c | 816 | ||||
| -rw-r--r-- | drivers/net/bonding/bond_sysfs_slave.c | 146 | ||||
| -rw-r--r-- | drivers/net/bonding/bonding_priv.h | 24 |
11 files changed, 13863 insertions, 0 deletions
diff --git a/drivers/net/bonding/Makefile b/drivers/net/bonding/Makefile new file mode 100644 index 000000000..30e8ae3da --- /dev/null +++ b/drivers/net/bonding/Makefile @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for the Ethernet Bonding driver +# + +obj-$(CONFIG_BONDING) += bonding.o + +bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o bond_sysfs_slave.o bond_debugfs.o bond_netlink.o bond_options.o + +proc-$(CONFIG_PROC_FS) += bond_procfs.o +bonding-objs += $(proc-y) + diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c new file mode 100644 index 000000000..320e54618 --- /dev/null +++ b/drivers/net/bonding/bond_3ad.c @@ -0,0 +1,2770 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. + */ + +#include <linux/skbuff.h> +#include <linux/if_ether.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/ethtool.h> +#include <linux/etherdevice.h> +#include <linux/if_bonding.h> +#include <linux/pkt_sched.h> +#include <net/net_namespace.h> +#include <net/bonding.h> +#include <net/bond_3ad.h> +#include <net/netlink.h> + +/* General definitions */ +#define AD_SHORT_TIMEOUT 1 +#define AD_LONG_TIMEOUT 0 +#define AD_STANDBY 0x2 +#define AD_MAX_TX_IN_SECOND 3 +#define AD_COLLECTOR_MAX_DELAY 0 + +/* Timer definitions (43.4.4 in the 802.3ad standard) */ +#define AD_FAST_PERIODIC_TIME 1 +#define AD_SLOW_PERIODIC_TIME 30 +#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME) +#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME) +#define AD_CHURN_DETECTION_TIME 60 +#define AD_AGGREGATE_WAIT_TIME 2 + +/* Port Variables definitions used by the State Machines (43.4.7 in the + * 802.3ad standard) + */ +#define AD_PORT_BEGIN 0x1 +#define AD_PORT_LACP_ENABLED 0x2 +#define AD_PORT_ACTOR_CHURN 0x4 +#define AD_PORT_PARTNER_CHURN 0x8 +#define AD_PORT_READY 0x10 +#define AD_PORT_READY_N 0x20 +#define AD_PORT_MATCHED 0x40 +#define AD_PORT_STANDBY 0x80 +#define AD_PORT_SELECTED 0x100 +#define AD_PORT_MOVED 0x200 +#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN) + +/* Port Key definitions + * key is determined according to the link speed, duplex and + * user key (which is yet not supported) + * -------------------------------------------------------------- + * Port key | User key (10 bits) | Speed (5 bits) | Duplex| + * -------------------------------------------------------------- + * |15 6|5 1|0 + */ +#define AD_DUPLEX_KEY_MASKS 0x1 +#define AD_SPEED_KEY_MASKS 0x3E +#define AD_USER_KEY_MASKS 0xFFC0 + +enum ad_link_speed_type { + AD_LINK_SPEED_1MBPS = 1, + AD_LINK_SPEED_10MBPS, + AD_LINK_SPEED_100MBPS, + AD_LINK_SPEED_1000MBPS, + AD_LINK_SPEED_2500MBPS, + AD_LINK_SPEED_5000MBPS, + AD_LINK_SPEED_10000MBPS, + AD_LINK_SPEED_14000MBPS, + AD_LINK_SPEED_20000MBPS, + AD_LINK_SPEED_25000MBPS, + AD_LINK_SPEED_40000MBPS, + AD_LINK_SPEED_50000MBPS, + AD_LINK_SPEED_56000MBPS, + AD_LINK_SPEED_100000MBPS, +}; + +/* compare MAC addresses */ +#define MAC_ADDRESS_EQUAL(A, B) \ + ether_addr_equal_64bits((const u8 *)A, (const u8 *)B) + +static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = { + 0, 0, 0, 0, 0, 0 +}; +static u16 ad_ticks_per_sec; +static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; + +const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = { + 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02 +}; + +/* ================= main 802.3ad protocol functions ================== */ +static int ad_lacpdu_send(struct port *port); +static int ad_marker_send(struct port *port, struct bond_marker *marker); +static void ad_mux_machine(struct port *port, bool *update_slave_arr); +static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port); +static void ad_tx_machine(struct port *port); +static void ad_periodic_machine(struct port *port); +static void ad_port_selection_logic(struct port *port, bool *update_slave_arr); +static void ad_agg_selection_logic(struct aggregator *aggregator, + bool *update_slave_arr); +static void ad_clear_agg(struct aggregator *aggregator); +static void ad_initialize_agg(struct aggregator *aggregator); +static void ad_initialize_port(struct port *port, int lacp_fast); +static void ad_enable_collecting_distributing(struct port *port, + bool *update_slave_arr); +static void ad_disable_collecting_distributing(struct port *port, + bool *update_slave_arr); +static void ad_marker_info_received(struct bond_marker *marker_info, + struct port *port); +static void ad_marker_response_received(struct bond_marker *marker, + struct port *port); +static void ad_update_actor_keys(struct port *port, bool reset); + + +/* ================= api to bonding and kernel code ================== */ + +/** + * __get_bond_by_port - get the port's bonding struct + * @port: the port we're looking at + * + * Return @port's bonding struct, or %NULL if it can't be found. + */ +static inline struct bonding *__get_bond_by_port(struct port *port) +{ + if (port->slave == NULL) + return NULL; + + return bond_get_bond_by_slave(port->slave); +} + +/** + * __get_first_agg - get the first aggregator in the bond + * @port: the port we're looking at + * + * Return the aggregator of the first slave in @bond, or %NULL if it can't be + * found. + * The caller must hold RCU or RTNL lock. + */ +static inline struct aggregator *__get_first_agg(struct port *port) +{ + struct bonding *bond = __get_bond_by_port(port); + struct slave *first_slave; + struct aggregator *agg; + + /* If there's no bond for this port, or bond has no slaves */ + if (bond == NULL) + return NULL; + + rcu_read_lock(); + first_slave = bond_first_slave_rcu(bond); + agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL; + rcu_read_unlock(); + + return agg; +} + +/** + * __agg_has_partner - see if we have a partner + * @agg: the agregator we're looking at + * + * Return nonzero if aggregator has a partner (denoted by a non-zero ether + * address for the partner). Return 0 if not. + */ +static inline int __agg_has_partner(struct aggregator *agg) +{ + return !is_zero_ether_addr(agg->partner_system.mac_addr_value); +} + +/** + * __disable_port - disable the port's slave + * @port: the port we're looking at + */ +static inline void __disable_port(struct port *port) +{ + bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); +} + +/** + * __enable_port - enable the port's slave, if it's up + * @port: the port we're looking at + */ +static inline void __enable_port(struct port *port) +{ + struct slave *slave = port->slave; + + if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave)) + bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER); +} + +/** + * __port_is_enabled - check if the port's slave is in active state + * @port: the port we're looking at + */ +static inline int __port_is_enabled(struct port *port) +{ + return bond_is_active_slave(port->slave); +} + +/** + * __get_agg_selection_mode - get the aggregator selection mode + * @port: the port we're looking at + * + * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT. + */ +static inline u32 __get_agg_selection_mode(struct port *port) +{ + struct bonding *bond = __get_bond_by_port(port); + + if (bond == NULL) + return BOND_AD_STABLE; + + return bond->params.ad_select; +} + +/** + * __check_agg_selection_timer - check if the selection timer has expired + * @port: the port we're looking at + */ +static inline int __check_agg_selection_timer(struct port *port) +{ + struct bonding *bond = __get_bond_by_port(port); + + if (bond == NULL) + return 0; + + return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0; +} + +/** + * __get_link_speed - get a port's speed + * @port: the port we're looking at + * + * Return @port's speed in 802.3ad enum format. i.e. one of: + * 0, + * %AD_LINK_SPEED_10MBPS, + * %AD_LINK_SPEED_100MBPS, + * %AD_LINK_SPEED_1000MBPS, + * %AD_LINK_SPEED_2500MBPS, + * %AD_LINK_SPEED_5000MBPS, + * %AD_LINK_SPEED_10000MBPS + * %AD_LINK_SPEED_14000MBPS, + * %AD_LINK_SPEED_20000MBPS + * %AD_LINK_SPEED_25000MBPS + * %AD_LINK_SPEED_40000MBPS + * %AD_LINK_SPEED_50000MBPS + * %AD_LINK_SPEED_56000MBPS + * %AD_LINK_SPEED_100000MBPS + */ +static u16 __get_link_speed(struct port *port) +{ + struct slave *slave = port->slave; + u16 speed; + + /* this if covers only a special case: when the configuration starts + * with link down, it sets the speed to 0. + * This is done in spite of the fact that the e100 driver reports 0 + * to be compatible with MVT in the future. + */ + if (slave->link != BOND_LINK_UP) + speed = 0; + else { + switch (slave->speed) { + case SPEED_10: + speed = AD_LINK_SPEED_10MBPS; + break; + + case SPEED_100: + speed = AD_LINK_SPEED_100MBPS; + break; + + case SPEED_1000: + speed = AD_LINK_SPEED_1000MBPS; + break; + + case SPEED_2500: + speed = AD_LINK_SPEED_2500MBPS; + break; + + case SPEED_5000: + speed = AD_LINK_SPEED_5000MBPS; + break; + + case SPEED_10000: + speed = AD_LINK_SPEED_10000MBPS; + break; + + case SPEED_14000: + speed = AD_LINK_SPEED_14000MBPS; + break; + + case SPEED_20000: + speed = AD_LINK_SPEED_20000MBPS; + break; + + case SPEED_25000: + speed = AD_LINK_SPEED_25000MBPS; + break; + + case SPEED_40000: + speed = AD_LINK_SPEED_40000MBPS; + break; + + case SPEED_50000: + speed = AD_LINK_SPEED_50000MBPS; + break; + + case SPEED_56000: + speed = AD_LINK_SPEED_56000MBPS; + break; + + case SPEED_100000: + speed = AD_LINK_SPEED_100000MBPS; + break; + + default: + /* unknown speed value from ethtool. shouldn't happen */ + if (slave->speed != SPEED_UNKNOWN) + pr_warn_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n", + slave->bond->dev->name, + slave->dev->name, slave->speed, + port->actor_port_number); + speed = 0; + break; + } + } + + slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n", + port->actor_port_number, speed); + return speed; +} + +/** + * __get_duplex - get a port's duplex + * @port: the port we're looking at + * + * Return @port's duplex in 802.3ad bitmask format. i.e.: + * 0x01 if in full duplex + * 0x00 otherwise + */ +static u8 __get_duplex(struct port *port) +{ + struct slave *slave = port->slave; + u8 retval = 0x0; + + /* handling a special case: when the configuration starts with + * link down, it sets the duplex to 0. + */ + if (slave->link == BOND_LINK_UP) { + switch (slave->duplex) { + case DUPLEX_FULL: + retval = 0x1; + slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n", + port->actor_port_number); + break; + case DUPLEX_HALF: + default: + retval = 0x0; + slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n", + port->actor_port_number); + break; + } + } + return retval; +} + +static void __ad_actor_update_port(struct port *port) +{ + const struct bonding *bond = bond_get_bond_by_slave(port->slave); + + port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr; + port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority; +} + +/* Conversions */ + +/** + * __ad_timer_to_ticks - convert a given timer type to AD module ticks + * @timer_type: which timer to operate + * @par: timer parameter. see below + * + * If @timer_type is %current_while_timer, @par indicates long/short timer. + * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME, + * %SLOW_PERIODIC_TIME. + */ +static u16 __ad_timer_to_ticks(u16 timer_type, u16 par) +{ + u16 retval = 0; /* to silence the compiler */ + + switch (timer_type) { + case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */ + if (par) + retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); + else + retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); + break; + case AD_ACTOR_CHURN_TIMER: /* for local churn machine */ + retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); + break; + case AD_PERIODIC_TIMER: /* for periodic machine */ + retval = (par*ad_ticks_per_sec); /* long timeout */ + break; + case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */ + retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); + break; + case AD_WAIT_WHILE_TIMER: /* for selection machine */ + retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec); + break; + } + + return retval; +} + + +/* ================= ad_rx_machine helper functions ================== */ + +/** + * __choose_matched - update a port's matched variable from a received lacpdu + * @lacpdu: the lacpdu we've received + * @port: the port we're looking at + * + * Update the value of the matched variable, using parameter values from a + * newly received lacpdu. Parameter values for the partner carried in the + * received PDU are compared with the corresponding operational parameter + * values for the actor. Matched is set to TRUE if all of these parameters + * match and the PDU parameter partner_state.aggregation has the same value as + * actor_oper_port_state.aggregation and lacp will actively maintain the link + * in the aggregation. Matched is also set to TRUE if the value of + * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates + * an individual link and lacp will actively maintain the link. Otherwise, + * matched is set to FALSE. LACP is considered to be actively maintaining the + * link if either the PDU's actor_state.lacp_activity variable is TRUE or both + * the actor's actor_oper_port_state.lacp_activity and the PDU's + * partner_state.lacp_activity variables are TRUE. + * + * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is + * used here to implement the language from 802.3ad 43.4.9 that requires + * recordPDU to "match" the LACPDU parameters to the stored values. + */ +static void __choose_matched(struct lacpdu *lacpdu, struct port *port) +{ + /* check if all parameters are alike + * or this is individual link(aggregation == FALSE) + * then update the state machine Matched variable. + */ + if (((ntohs(lacpdu->partner_port) == port->actor_port_number) && + (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) && + MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) && + (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) && + (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) && + ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) || + ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0) + ) { + port->sm_vars |= AD_PORT_MATCHED; + } else { + port->sm_vars &= ~AD_PORT_MATCHED; + } +} + +/** + * __record_pdu - record parameters from a received lacpdu + * @lacpdu: the lacpdu we've received + * @port: the port we're looking at + * + * Record the parameter values for the Actor carried in a received lacpdu as + * the current partner operational parameter values and sets + * actor_oper_port_state.defaulted to FALSE. + */ +static void __record_pdu(struct lacpdu *lacpdu, struct port *port) +{ + if (lacpdu && port) { + struct port_params *partner = &port->partner_oper; + + __choose_matched(lacpdu, port); + /* record the new parameter values for the partner + * operational + */ + partner->port_number = ntohs(lacpdu->actor_port); + partner->port_priority = ntohs(lacpdu->actor_port_priority); + partner->system = lacpdu->actor_system; + partner->system_priority = ntohs(lacpdu->actor_system_priority); + partner->key = ntohs(lacpdu->actor_key); + partner->port_state = lacpdu->actor_state; + + /* set actor_oper_port_state.defaulted to FALSE */ + port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED; + + /* set the partner sync. to on if the partner is sync, + * and the port is matched + */ + if ((port->sm_vars & AD_PORT_MATCHED) && + (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) { + partner->port_state |= LACP_STATE_SYNCHRONIZATION; + slave_dbg(port->slave->bond->dev, port->slave->dev, + "partner sync=1\n"); + } else { + partner->port_state &= ~LACP_STATE_SYNCHRONIZATION; + slave_dbg(port->slave->bond->dev, port->slave->dev, + "partner sync=0\n"); + } + } +} + +/** + * __record_default - record default parameters + * @port: the port we're looking at + * + * This function records the default parameter values for the partner carried + * in the Partner Admin parameters as the current partner operational parameter + * values and sets actor_oper_port_state.defaulted to TRUE. + */ +static void __record_default(struct port *port) +{ + if (port) { + /* record the partner admin parameters */ + memcpy(&port->partner_oper, &port->partner_admin, + sizeof(struct port_params)); + + /* set actor_oper_port_state.defaulted to true */ + port->actor_oper_port_state |= LACP_STATE_DEFAULTED; + } +} + +/** + * __update_selected - update a port's Selected variable from a received lacpdu + * @lacpdu: the lacpdu we've received + * @port: the port we're looking at + * + * Update the value of the selected variable, using parameter values from a + * newly received lacpdu. The parameter values for the Actor carried in the + * received PDU are compared with the corresponding operational parameter + * values for the ports partner. If one or more of the comparisons shows that + * the value(s) received in the PDU differ from the current operational values, + * then selected is set to FALSE and actor_oper_port_state.synchronization is + * set to out_of_sync. Otherwise, selected remains unchanged. + */ +static void __update_selected(struct lacpdu *lacpdu, struct port *port) +{ + if (lacpdu && port) { + const struct port_params *partner = &port->partner_oper; + + /* check if any parameter is different then + * update the state machine selected variable. + */ + if (ntohs(lacpdu->actor_port) != partner->port_number || + ntohs(lacpdu->actor_port_priority) != partner->port_priority || + !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) || + ntohs(lacpdu->actor_system_priority) != partner->system_priority || + ntohs(lacpdu->actor_key) != partner->key || + (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) { + port->sm_vars &= ~AD_PORT_SELECTED; + } + } +} + +/** + * __update_default_selected - update a port's Selected variable from Partner + * @port: the port we're looking at + * + * This function updates the value of the selected variable, using the partner + * administrative parameter values. The administrative values are compared with + * the corresponding operational parameter values for the partner. If one or + * more of the comparisons shows that the administrative value(s) differ from + * the current operational values, then Selected is set to FALSE and + * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise, + * Selected remains unchanged. + */ +static void __update_default_selected(struct port *port) +{ + if (port) { + const struct port_params *admin = &port->partner_admin; + const struct port_params *oper = &port->partner_oper; + + /* check if any parameter is different then + * update the state machine selected variable. + */ + if (admin->port_number != oper->port_number || + admin->port_priority != oper->port_priority || + !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) || + admin->system_priority != oper->system_priority || + admin->key != oper->key || + (admin->port_state & LACP_STATE_AGGREGATION) + != (oper->port_state & LACP_STATE_AGGREGATION)) { + port->sm_vars &= ~AD_PORT_SELECTED; + } + } +} + +/** + * __update_ntt - update a port's ntt variable from a received lacpdu + * @lacpdu: the lacpdu we've received + * @port: the port we're looking at + * + * Updates the value of the ntt variable, using parameter values from a newly + * received lacpdu. The parameter values for the partner carried in the + * received PDU are compared with the corresponding operational parameter + * values for the Actor. If one or more of the comparisons shows that the + * value(s) received in the PDU differ from the current operational values, + * then ntt is set to TRUE. Otherwise, ntt remains unchanged. + */ +static void __update_ntt(struct lacpdu *lacpdu, struct port *port) +{ + /* validate lacpdu and port */ + if (lacpdu && port) { + /* check if any parameter is different then + * update the port->ntt. + */ + if ((ntohs(lacpdu->partner_port) != port->actor_port_number) || + (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) || + !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) || + (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) || + (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) || + ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) || + ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) || + ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) || + ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION)) + ) { + port->ntt = true; + } + } +} + +/** + * __agg_ports_are_ready - check if all ports in an aggregator are ready + * @aggregator: the aggregator we're looking at + * + */ +static int __agg_ports_are_ready(struct aggregator *aggregator) +{ + struct port *port; + int retval = 1; + + if (aggregator) { + /* scan all ports in this aggregator to verfy if they are + * all ready. + */ + for (port = aggregator->lag_ports; + port; + port = port->next_port_in_aggregator) { + if (!(port->sm_vars & AD_PORT_READY_N)) { + retval = 0; + break; + } + } + } + + return retval; +} + +/** + * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator + * @aggregator: the aggregator we're looking at + * @val: Should the ports' ready bit be set on or off + * + */ +static void __set_agg_ports_ready(struct aggregator *aggregator, int val) +{ + struct port *port; + + for (port = aggregator->lag_ports; port; + port = port->next_port_in_aggregator) { + if (val) + port->sm_vars |= AD_PORT_READY; + else + port->sm_vars &= ~AD_PORT_READY; + } +} + +static int __agg_active_ports(struct aggregator *agg) +{ + struct port *port; + int active = 0; + + for (port = agg->lag_ports; port; + port = port->next_port_in_aggregator) { + if (port->is_enabled) + active++; + } + + return active; +} + +/** + * __get_agg_bandwidth - get the total bandwidth of an aggregator + * @aggregator: the aggregator we're looking at + * + */ +static u32 __get_agg_bandwidth(struct aggregator *aggregator) +{ + int nports = __agg_active_ports(aggregator); + u32 bandwidth = 0; + + if (nports) { + switch (__get_link_speed(aggregator->lag_ports)) { + case AD_LINK_SPEED_1MBPS: + bandwidth = nports; + break; + case AD_LINK_SPEED_10MBPS: + bandwidth = nports * 10; + break; + case AD_LINK_SPEED_100MBPS: + bandwidth = nports * 100; + break; + case AD_LINK_SPEED_1000MBPS: + bandwidth = nports * 1000; + break; + case AD_LINK_SPEED_2500MBPS: + bandwidth = nports * 2500; + break; + case AD_LINK_SPEED_5000MBPS: + bandwidth = nports * 5000; + break; + case AD_LINK_SPEED_10000MBPS: + bandwidth = nports * 10000; + break; + case AD_LINK_SPEED_14000MBPS: + bandwidth = nports * 14000; + break; + case AD_LINK_SPEED_20000MBPS: + bandwidth = nports * 20000; + break; + case AD_LINK_SPEED_25000MBPS: + bandwidth = nports * 25000; + break; + case AD_LINK_SPEED_40000MBPS: + bandwidth = nports * 40000; + break; + case AD_LINK_SPEED_50000MBPS: + bandwidth = nports * 50000; + break; + case AD_LINK_SPEED_56000MBPS: + bandwidth = nports * 56000; + break; + case AD_LINK_SPEED_100000MBPS: + bandwidth = nports * 100000; + break; + default: + bandwidth = 0; /* to silence the compiler */ + } + } + return bandwidth; +} + +/** + * __get_active_agg - get the current active aggregator + * @aggregator: the aggregator we're looking at + * + * Caller must hold RCU lock. + */ +static struct aggregator *__get_active_agg(struct aggregator *aggregator) +{ + struct bonding *bond = aggregator->slave->bond; + struct list_head *iter; + struct slave *slave; + + bond_for_each_slave_rcu(bond, slave, iter) + if (SLAVE_AD_INFO(slave)->aggregator.is_active) + return &(SLAVE_AD_INFO(slave)->aggregator); + + return NULL; +} + +/** + * __update_lacpdu_from_port - update a port's lacpdu fields + * @port: the port we're looking at + */ +static inline void __update_lacpdu_from_port(struct port *port) +{ + struct lacpdu *lacpdu = &port->lacpdu; + const struct port_params *partner = &port->partner_oper; + + /* update current actual Actor parameters + * lacpdu->subtype initialized + * lacpdu->version_number initialized + * lacpdu->tlv_type_actor_info initialized + * lacpdu->actor_information_length initialized + */ + + lacpdu->actor_system_priority = htons(port->actor_system_priority); + lacpdu->actor_system = port->actor_system; + lacpdu->actor_key = htons(port->actor_oper_port_key); + lacpdu->actor_port_priority = htons(port->actor_port_priority); + lacpdu->actor_port = htons(port->actor_port_number); + lacpdu->actor_state = port->actor_oper_port_state; + slave_dbg(port->slave->bond->dev, port->slave->dev, + "update lacpdu: actor port state %x\n", + port->actor_oper_port_state); + + /* lacpdu->reserved_3_1 initialized + * lacpdu->tlv_type_partner_info initialized + * lacpdu->partner_information_length initialized + */ + + lacpdu->partner_system_priority = htons(partner->system_priority); + lacpdu->partner_system = partner->system; + lacpdu->partner_key = htons(partner->key); + lacpdu->partner_port_priority = htons(partner->port_priority); + lacpdu->partner_port = htons(partner->port_number); + lacpdu->partner_state = partner->port_state; + + /* lacpdu->reserved_3_2 initialized + * lacpdu->tlv_type_collector_info initialized + * lacpdu->collector_information_length initialized + * collector_max_delay initialized + * reserved_12[12] initialized + * tlv_type_terminator initialized + * terminator_length initialized + * reserved_50[50] initialized + */ +} + +/* ================= main 802.3ad protocol code ========================= */ + +/** + * ad_lacpdu_send - send out a lacpdu packet on a given port + * @port: the port we're looking at + * + * Returns: 0 on success + * < 0 on error + */ +static int ad_lacpdu_send(struct port *port) +{ + struct slave *slave = port->slave; + struct sk_buff *skb; + struct lacpdu_header *lacpdu_header; + int length = sizeof(struct lacpdu_header); + + skb = dev_alloc_skb(length); + if (!skb) + return -ENOMEM; + + atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx); + atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx); + + skb->dev = slave->dev; + skb_reset_mac_header(skb); + skb->network_header = skb->mac_header + ETH_HLEN; + skb->protocol = PKT_TYPE_LACPDU; + skb->priority = TC_PRIO_CONTROL; + + lacpdu_header = skb_put(skb, length); + + ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr); + /* Note: source address is set to be the member's PERMANENT address, + * because we use it to identify loopback lacpdus in receive. + */ + ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr); + lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU; + + lacpdu_header->lacpdu = port->lacpdu; + + dev_queue_xmit(skb); + + return 0; +} + +/** + * ad_marker_send - send marker information/response on a given port + * @port: the port we're looking at + * @marker: marker data to send + * + * Returns: 0 on success + * < 0 on error + */ +static int ad_marker_send(struct port *port, struct bond_marker *marker) +{ + struct slave *slave = port->slave; + struct sk_buff *skb; + struct bond_marker_header *marker_header; + int length = sizeof(struct bond_marker_header); + + skb = dev_alloc_skb(length + 16); + if (!skb) + return -ENOMEM; + + switch (marker->tlv_type) { + case AD_MARKER_INFORMATION_SUBTYPE: + atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx); + atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx); + break; + case AD_MARKER_RESPONSE_SUBTYPE: + atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx); + atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx); + break; + } + + skb_reserve(skb, 16); + + skb->dev = slave->dev; + skb_reset_mac_header(skb); + skb->network_header = skb->mac_header + ETH_HLEN; + skb->protocol = PKT_TYPE_LACPDU; + + marker_header = skb_put(skb, length); + + ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr); + /* Note: source address is set to be the member's PERMANENT address, + * because we use it to identify loopback MARKERs in receive. + */ + ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr); + marker_header->hdr.h_proto = PKT_TYPE_LACPDU; + + marker_header->marker = *marker; + + dev_queue_xmit(skb); + + return 0; +} + +/** + * ad_mux_machine - handle a port's mux state machine + * @port: the port we're looking at + * @update_slave_arr: Does slave array need update? + */ +static void ad_mux_machine(struct port *port, bool *update_slave_arr) +{ + mux_states_t last_state; + + /* keep current State Machine state to compare later if it was + * changed + */ + last_state = port->sm_mux_state; + + if (port->sm_vars & AD_PORT_BEGIN) { + port->sm_mux_state = AD_MUX_DETACHED; + } else { + switch (port->sm_mux_state) { + case AD_MUX_DETACHED: + if ((port->sm_vars & AD_PORT_SELECTED) + || (port->sm_vars & AD_PORT_STANDBY)) + /* if SELECTED or STANDBY */ + port->sm_mux_state = AD_MUX_WAITING; + break; + case AD_MUX_WAITING: + /* if SELECTED == FALSE return to DETACH state */ + if (!(port->sm_vars & AD_PORT_SELECTED)) { + port->sm_vars &= ~AD_PORT_READY_N; + /* in order to withhold the Selection Logic to + * check all ports READY_N value every callback + * cycle to update ready variable, we check + * READY_N and update READY here + */ + __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); + port->sm_mux_state = AD_MUX_DETACHED; + break; + } + + /* check if the wait_while_timer expired */ + if (port->sm_mux_timer_counter + && !(--port->sm_mux_timer_counter)) + port->sm_vars |= AD_PORT_READY_N; + + /* in order to withhold the selection logic to check + * all ports READY_N value every callback cycle to + * update ready variable, we check READY_N and update + * READY here + */ + __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); + + /* if the wait_while_timer expired, and the port is + * in READY state, move to ATTACHED state + */ + if ((port->sm_vars & AD_PORT_READY) + && !port->sm_mux_timer_counter) + port->sm_mux_state = AD_MUX_ATTACHED; + break; + case AD_MUX_ATTACHED: + /* check also if agg_select_timer expired (so the + * edable port will take place only after this timer) + */ + if ((port->sm_vars & AD_PORT_SELECTED) && + (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) && + !__check_agg_selection_timer(port)) { + if (port->aggregator->is_active) + port->sm_mux_state = + AD_MUX_COLLECTING_DISTRIBUTING; + } else if (!(port->sm_vars & AD_PORT_SELECTED) || + (port->sm_vars & AD_PORT_STANDBY)) { + /* if UNSELECTED or STANDBY */ + port->sm_vars &= ~AD_PORT_READY_N; + /* in order to withhold the selection logic to + * check all ports READY_N value every callback + * cycle to update ready variable, we check + * READY_N and update READY here + */ + __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); + port->sm_mux_state = AD_MUX_DETACHED; + } else if (port->aggregator->is_active) { + port->actor_oper_port_state |= + LACP_STATE_SYNCHRONIZATION; + } + break; + case AD_MUX_COLLECTING_DISTRIBUTING: + if (!(port->sm_vars & AD_PORT_SELECTED) || + (port->sm_vars & AD_PORT_STANDBY) || + !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) || + !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) { + port->sm_mux_state = AD_MUX_ATTACHED; + } else { + /* if port state hasn't changed make + * sure that a collecting distributing + * port in an active aggregator is enabled + */ + if (port->aggregator && + port->aggregator->is_active && + !__port_is_enabled(port)) { + __enable_port(port); + *update_slave_arr = true; + } + } + break; + default: + break; + } + } + + /* check if the state machine was changed */ + if (port->sm_mux_state != last_state) { + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", + port->actor_port_number, + last_state, + port->sm_mux_state); + switch (port->sm_mux_state) { + case AD_MUX_DETACHED: + port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; + ad_disable_collecting_distributing(port, + update_slave_arr); + port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; + port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; + port->ntt = true; + break; + case AD_MUX_WAITING: + port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0); + break; + case AD_MUX_ATTACHED: + if (port->aggregator->is_active) + port->actor_oper_port_state |= + LACP_STATE_SYNCHRONIZATION; + else + port->actor_oper_port_state &= + ~LACP_STATE_SYNCHRONIZATION; + port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; + port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; + ad_disable_collecting_distributing(port, + update_slave_arr); + port->ntt = true; + break; + case AD_MUX_COLLECTING_DISTRIBUTING: + port->actor_oper_port_state |= LACP_STATE_COLLECTING; + port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING; + port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; + ad_enable_collecting_distributing(port, + update_slave_arr); + port->ntt = true; + break; + default: + break; + } + } +} + +/** + * ad_rx_machine - handle a port's rx State Machine + * @lacpdu: the lacpdu we've received + * @port: the port we're looking at + * + * If lacpdu arrived, stop previous timer (if exists) and set the next state as + * CURRENT. If timer expired set the state machine in the proper state. + * In other cases, this function checks if we need to switch to other state. + */ +static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port) +{ + rx_states_t last_state; + + /* keep current State Machine state to compare later if it was + * changed + */ + last_state = port->sm_rx_state; + + if (lacpdu) { + atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx); + atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx); + } + /* check if state machine should change state */ + + /* first, check if port was reinitialized */ + if (port->sm_vars & AD_PORT_BEGIN) { + port->sm_rx_state = AD_RX_INITIALIZE; + port->sm_vars |= AD_PORT_CHURNED; + /* check if port is not enabled */ + } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled) + port->sm_rx_state = AD_RX_PORT_DISABLED; + /* check if new lacpdu arrived */ + else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || + (port->sm_rx_state == AD_RX_DEFAULTED) || + (port->sm_rx_state == AD_RX_CURRENT))) { + if (port->sm_rx_state != AD_RX_CURRENT) + port->sm_vars |= AD_PORT_CHURNED; + port->sm_rx_timer_counter = 0; + port->sm_rx_state = AD_RX_CURRENT; + } else { + /* if timer is on, and if it is expired */ + if (port->sm_rx_timer_counter && + !(--port->sm_rx_timer_counter)) { + switch (port->sm_rx_state) { + case AD_RX_EXPIRED: + port->sm_rx_state = AD_RX_DEFAULTED; + break; + case AD_RX_CURRENT: + port->sm_rx_state = AD_RX_EXPIRED; + break; + default: + break; + } + } else { + /* if no lacpdu arrived and no timer is on */ + switch (port->sm_rx_state) { + case AD_RX_PORT_DISABLED: + if (port->is_enabled && + (port->sm_vars & AD_PORT_LACP_ENABLED)) + port->sm_rx_state = AD_RX_EXPIRED; + else if (port->is_enabled + && ((port->sm_vars + & AD_PORT_LACP_ENABLED) == 0)) + port->sm_rx_state = AD_RX_LACP_DISABLED; + break; + default: + break; + + } + } + } + + /* check if the State machine was changed or new lacpdu arrived */ + if ((port->sm_rx_state != last_state) || (lacpdu)) { + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", + port->actor_port_number, + last_state, + port->sm_rx_state); + switch (port->sm_rx_state) { + case AD_RX_INITIALIZE: + if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)) + port->sm_vars &= ~AD_PORT_LACP_ENABLED; + else + port->sm_vars |= AD_PORT_LACP_ENABLED; + port->sm_vars &= ~AD_PORT_SELECTED; + __record_default(port); + port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; + port->sm_rx_state = AD_RX_PORT_DISABLED; + + fallthrough; + case AD_RX_PORT_DISABLED: + port->sm_vars &= ~AD_PORT_MATCHED; + break; + case AD_RX_LACP_DISABLED: + port->sm_vars &= ~AD_PORT_SELECTED; + __record_default(port); + port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION; + port->sm_vars |= AD_PORT_MATCHED; + port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; + break; + case AD_RX_EXPIRED: + /* Reset of the Synchronization flag (Standard 43.4.12) + * This reset cause to disable this port in the + * COLLECTING_DISTRIBUTING state of the mux machine in + * case of EXPIRED even if LINK_DOWN didn't arrive for + * the port. + */ + port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION; + port->sm_vars &= ~AD_PORT_MATCHED; + port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT; + port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY; + port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT)); + port->actor_oper_port_state |= LACP_STATE_EXPIRED; + port->sm_vars |= AD_PORT_CHURNED; + break; + case AD_RX_DEFAULTED: + __update_default_selected(port); + __record_default(port); + port->sm_vars |= AD_PORT_MATCHED; + port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; + break; + case AD_RX_CURRENT: + /* detect loopback situation */ + if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), + &(port->actor_system))) { + slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n" + "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n"); + return; + } + __update_selected(lacpdu, port); + __update_ntt(lacpdu, port); + __record_pdu(lacpdu, port); + port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)); + port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; + break; + default: + break; + } + } +} + +/** + * ad_churn_machine - handle port churn's state machine + * @port: the port we're looking at + * + */ +static void ad_churn_machine(struct port *port) +{ + if (port->sm_vars & AD_PORT_CHURNED) { + port->sm_vars &= ~AD_PORT_CHURNED; + port->sm_churn_actor_state = AD_CHURN_MONITOR; + port->sm_churn_partner_state = AD_CHURN_MONITOR; + port->sm_churn_actor_timer_counter = + __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0); + port->sm_churn_partner_timer_counter = + __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0); + return; + } + if (port->sm_churn_actor_timer_counter && + !(--port->sm_churn_actor_timer_counter) && + port->sm_churn_actor_state == AD_CHURN_MONITOR) { + if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) { + port->sm_churn_actor_state = AD_NO_CHURN; + } else { + port->churn_actor_count++; + port->sm_churn_actor_state = AD_CHURN; + } + } + if (port->sm_churn_partner_timer_counter && + !(--port->sm_churn_partner_timer_counter) && + port->sm_churn_partner_state == AD_CHURN_MONITOR) { + if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) { + port->sm_churn_partner_state = AD_NO_CHURN; + } else { + port->churn_partner_count++; + port->sm_churn_partner_state = AD_CHURN; + } + } +} + +/** + * ad_tx_machine - handle a port's tx state machine + * @port: the port we're looking at + */ +static void ad_tx_machine(struct port *port) +{ + /* check if tx timer expired, to verify that we do not send more than + * 3 packets per second + */ + if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) { + /* check if there is something to send */ + if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) { + __update_lacpdu_from_port(port); + + if (ad_lacpdu_send(port) >= 0) { + slave_dbg(port->slave->bond->dev, + port->slave->dev, + "Sent LACPDU on port %d\n", + port->actor_port_number); + + /* mark ntt as false, so it will not be sent + * again until demanded + */ + port->ntt = false; + } + } + /* restart tx timer(to verify that we will not exceed + * AD_MAX_TX_IN_SECOND + */ + port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; + } +} + +/** + * ad_periodic_machine - handle a port's periodic state machine + * @port: the port we're looking at + * + * Turn ntt flag on priodically to perform periodic transmission of lacpdu's. + */ +static void ad_periodic_machine(struct port *port) +{ + periodic_states_t last_state; + + /* keep current state machine state to compare later if it was changed */ + last_state = port->sm_periodic_state; + + /* check if port was reinitialized */ + if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) || + (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY)) + ) { + port->sm_periodic_state = AD_NO_PERIODIC; + } + /* check if state machine should change state */ + else if (port->sm_periodic_timer_counter) { + /* check if periodic state machine expired */ + if (!(--port->sm_periodic_timer_counter)) { + /* if expired then do tx */ + port->sm_periodic_state = AD_PERIODIC_TX; + } else { + /* If not expired, check if there is some new timeout + * parameter from the partner state + */ + switch (port->sm_periodic_state) { + case AD_FAST_PERIODIC: + if (!(port->partner_oper.port_state + & LACP_STATE_LACP_TIMEOUT)) + port->sm_periodic_state = AD_SLOW_PERIODIC; + break; + case AD_SLOW_PERIODIC: + if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) { + port->sm_periodic_timer_counter = 0; + port->sm_periodic_state = AD_PERIODIC_TX; + } + break; + default: + break; + } + } + } else { + switch (port->sm_periodic_state) { + case AD_NO_PERIODIC: + port->sm_periodic_state = AD_FAST_PERIODIC; + break; + case AD_PERIODIC_TX: + if (!(port->partner_oper.port_state & + LACP_STATE_LACP_TIMEOUT)) + port->sm_periodic_state = AD_SLOW_PERIODIC; + else + port->sm_periodic_state = AD_FAST_PERIODIC; + break; + default: + break; + } + } + + /* check if the state machine was changed */ + if (port->sm_periodic_state != last_state) { + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", + port->actor_port_number, last_state, + port->sm_periodic_state); + switch (port->sm_periodic_state) { + case AD_NO_PERIODIC: + port->sm_periodic_timer_counter = 0; + break; + case AD_FAST_PERIODIC: + /* decrement 1 tick we lost in the PERIODIC_TX cycle */ + port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; + break; + case AD_SLOW_PERIODIC: + /* decrement 1 tick we lost in the PERIODIC_TX cycle */ + port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; + break; + case AD_PERIODIC_TX: + port->ntt = true; + break; + default: + break; + } + } +} + +/** + * ad_port_selection_logic - select aggregation groups + * @port: the port we're looking at + * @update_slave_arr: Does slave array need update? + * + * Select aggregation groups, and assign each port for it's aggregetor. The + * selection logic is called in the inititalization (after all the handshkes), + * and after every lacpdu receive (if selected is off). + */ +static void ad_port_selection_logic(struct port *port, bool *update_slave_arr) +{ + struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator; + struct port *last_port = NULL, *curr_port; + struct list_head *iter; + struct bonding *bond; + struct slave *slave; + int found = 0; + + /* if the port is already Selected, do nothing */ + if (port->sm_vars & AD_PORT_SELECTED) + return; + + bond = __get_bond_by_port(port); + + /* if the port is connected to other aggregator, detach it */ + if (port->aggregator) { + /* detach the port from its former aggregator */ + temp_aggregator = port->aggregator; + for (curr_port = temp_aggregator->lag_ports; curr_port; + last_port = curr_port, + curr_port = curr_port->next_port_in_aggregator) { + if (curr_port == port) { + temp_aggregator->num_of_ports--; + /* if it is the first port attached to the + * aggregator + */ + if (!last_port) { + temp_aggregator->lag_ports = + port->next_port_in_aggregator; + } else { + /* not the first port attached to the + * aggregator + */ + last_port->next_port_in_aggregator = + port->next_port_in_aggregator; + } + + /* clear the port's relations to this + * aggregator + */ + port->aggregator = NULL; + port->next_port_in_aggregator = NULL; + port->actor_port_aggregator_identifier = 0; + + slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n", + port->actor_port_number, + temp_aggregator->aggregator_identifier); + /* if the aggregator is empty, clear its + * parameters, and set it ready to be attached + */ + if (!temp_aggregator->lag_ports) + ad_clear_agg(temp_aggregator); + break; + } + } + if (!curr_port) { + /* meaning: the port was related to an aggregator + * but was not on the aggregator port list + */ + net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n", + port->slave->bond->dev->name, + port->slave->dev->name, + port->actor_port_number, + port->aggregator->aggregator_identifier); + } + } + /* search on all aggregators for a suitable aggregator for this port */ + bond_for_each_slave(bond, slave, iter) { + aggregator = &(SLAVE_AD_INFO(slave)->aggregator); + + /* keep a free aggregator for later use(if needed) */ + if (!aggregator->lag_ports) { + if (!free_aggregator) + free_aggregator = aggregator; + continue; + } + /* check if current aggregator suits us */ + if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */ + MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) && + (aggregator->partner_system_priority == port->partner_oper.system_priority) && + (aggregator->partner_oper_aggregator_key == port->partner_oper.key) + ) && + ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */ + !aggregator->is_individual) /* but is not individual OR */ + ) + ) { + /* attach to the founded aggregator */ + port->aggregator = aggregator; + port->actor_port_aggregator_identifier = + port->aggregator->aggregator_identifier; + port->next_port_in_aggregator = aggregator->lag_ports; + port->aggregator->num_of_ports++; + aggregator->lag_ports = port; + slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n", + port->actor_port_number, + port->aggregator->aggregator_identifier); + + /* mark this port as selected */ + port->sm_vars |= AD_PORT_SELECTED; + found = 1; + break; + } + } + + /* the port couldn't find an aggregator - attach it to a new + * aggregator + */ + if (!found) { + if (free_aggregator) { + /* assign port a new aggregator */ + port->aggregator = free_aggregator; + port->actor_port_aggregator_identifier = + port->aggregator->aggregator_identifier; + + /* update the new aggregator's parameters + * if port was responsed from the end-user + */ + if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS) + /* if port is full duplex */ + port->aggregator->is_individual = false; + else + port->aggregator->is_individual = true; + + port->aggregator->actor_admin_aggregator_key = + port->actor_admin_port_key; + port->aggregator->actor_oper_aggregator_key = + port->actor_oper_port_key; + port->aggregator->partner_system = + port->partner_oper.system; + port->aggregator->partner_system_priority = + port->partner_oper.system_priority; + port->aggregator->partner_oper_aggregator_key = port->partner_oper.key; + port->aggregator->receive_state = 1; + port->aggregator->transmit_state = 1; + port->aggregator->lag_ports = port; + port->aggregator->num_of_ports++; + + /* mark this port as selected */ + port->sm_vars |= AD_PORT_SELECTED; + + slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n", + port->actor_port_number, + port->aggregator->aggregator_identifier); + } else { + slave_err(bond->dev, port->slave->dev, + "Port %d did not find a suitable aggregator\n", + port->actor_port_number); + return; + } + } + /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE + * in all aggregator's ports, else set ready=FALSE in all + * aggregator's ports + */ + __set_agg_ports_ready(port->aggregator, + __agg_ports_are_ready(port->aggregator)); + + aggregator = __get_first_agg(port); + ad_agg_selection_logic(aggregator, update_slave_arr); + + if (!port->aggregator->is_active) + port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; +} + +/* Decide if "agg" is a better choice for the new active aggregator that + * the current best, according to the ad_select policy. + */ +static struct aggregator *ad_agg_selection_test(struct aggregator *best, + struct aggregator *curr) +{ + /* 0. If no best, select current. + * + * 1. If the current agg is not individual, and the best is + * individual, select current. + * + * 2. If current agg is individual and the best is not, keep best. + * + * 3. Therefore, current and best are both individual or both not + * individual, so: + * + * 3a. If current agg partner replied, and best agg partner did not, + * select current. + * + * 3b. If current agg partner did not reply and best agg partner + * did reply, keep best. + * + * 4. Therefore, current and best both have partner replies or + * both do not, so perform selection policy: + * + * BOND_AD_COUNT: Select by count of ports. If count is equal, + * select by bandwidth. + * + * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth. + */ + if (!best) + return curr; + + if (!curr->is_individual && best->is_individual) + return curr; + + if (curr->is_individual && !best->is_individual) + return best; + + if (__agg_has_partner(curr) && !__agg_has_partner(best)) + return curr; + + if (!__agg_has_partner(curr) && __agg_has_partner(best)) + return best; + + switch (__get_agg_selection_mode(curr->lag_ports)) { + case BOND_AD_COUNT: + if (__agg_active_ports(curr) > __agg_active_ports(best)) + return curr; + + if (__agg_active_ports(curr) < __agg_active_ports(best)) + return best; + + fallthrough; + case BOND_AD_STABLE: + case BOND_AD_BANDWIDTH: + if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best)) + return curr; + + break; + + default: + net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n", + curr->slave->bond->dev->name, + curr->slave->dev->name, + __get_agg_selection_mode(curr->lag_ports)); + break; + } + + return best; +} + +static int agg_device_up(const struct aggregator *agg) +{ + struct port *port = agg->lag_ports; + + if (!port) + return 0; + + for (port = agg->lag_ports; port; + port = port->next_port_in_aggregator) { + if (netif_running(port->slave->dev) && + netif_carrier_ok(port->slave->dev)) + return 1; + } + + return 0; +} + +/** + * ad_agg_selection_logic - select an aggregation group for a team + * @agg: the aggregator we're looking at + * @update_slave_arr: Does slave array need update? + * + * It is assumed that only one aggregator may be selected for a team. + * + * The logic of this function is to select the aggregator according to + * the ad_select policy: + * + * BOND_AD_STABLE: select the aggregator with the most ports attached to + * it, and to reselect the active aggregator only if the previous + * aggregator has no more ports related to it. + * + * BOND_AD_BANDWIDTH: select the aggregator with the highest total + * bandwidth, and reselect whenever a link state change takes place or the + * set of slaves in the bond changes. + * + * BOND_AD_COUNT: select the aggregator with largest number of ports + * (slaves), and reselect whenever a link state change takes place or the + * set of slaves in the bond changes. + * + * FIXME: this function MUST be called with the first agg in the bond, or + * __get_active_agg() won't work correctly. This function should be better + * called with the bond itself, and retrieve the first agg from it. + */ +static void ad_agg_selection_logic(struct aggregator *agg, + bool *update_slave_arr) +{ + struct aggregator *best, *active, *origin; + struct bonding *bond = agg->slave->bond; + struct list_head *iter; + struct slave *slave; + struct port *port; + + rcu_read_lock(); + origin = agg; + active = __get_active_agg(agg); + best = (active && agg_device_up(active)) ? active : NULL; + + bond_for_each_slave_rcu(bond, slave, iter) { + agg = &(SLAVE_AD_INFO(slave)->aggregator); + + agg->is_active = 0; + + if (__agg_active_ports(agg) && agg_device_up(agg)) + best = ad_agg_selection_test(best, agg); + } + + if (best && + __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) { + /* For the STABLE policy, don't replace the old active + * aggregator if it's still active (it has an answering + * partner) or if both the best and active don't have an + * answering partner. + */ + if (active && active->lag_ports && + __agg_active_ports(active) && + (__agg_has_partner(active) || + (!__agg_has_partner(active) && + !__agg_has_partner(best)))) { + if (!(!active->actor_oper_aggregator_key && + best->actor_oper_aggregator_key)) { + best = NULL; + active->is_active = 1; + } + } + } + + if (best && (best == active)) { + best = NULL; + active->is_active = 1; + } + + /* if there is new best aggregator, activate it */ + if (best) { + netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", + best->slave ? best->slave->dev->name : "NULL", + best->aggregator_identifier, best->num_of_ports, + best->actor_oper_aggregator_key, + best->partner_oper_aggregator_key, + best->is_individual, best->is_active); + netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n", + best->slave ? best->slave->dev->name : "NULL", + best->lag_ports, best->slave); + + bond_for_each_slave_rcu(bond, slave, iter) { + agg = &(SLAVE_AD_INFO(slave)->aggregator); + + slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", + agg->aggregator_identifier, agg->num_of_ports, + agg->actor_oper_aggregator_key, + agg->partner_oper_aggregator_key, + agg->is_individual, agg->is_active); + } + + /* check if any partner replies */ + if (best->is_individual) + net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n", + bond->dev->name); + + best->is_active = 1; + netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n", + best->slave ? best->slave->dev->name : "NULL", + best->aggregator_identifier); + netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", + best->slave ? best->slave->dev->name : "NULL", + best->aggregator_identifier, best->num_of_ports, + best->actor_oper_aggregator_key, + best->partner_oper_aggregator_key, + best->is_individual, best->is_active); + + /* disable the ports that were related to the former + * active_aggregator + */ + if (active) { + for (port = active->lag_ports; port; + port = port->next_port_in_aggregator) { + __disable_port(port); + } + } + /* Slave array needs update. */ + *update_slave_arr = true; + } + + /* if the selected aggregator is of join individuals + * (partner_system is NULL), enable their ports + */ + active = __get_active_agg(origin); + + if (active) { + if (!__agg_has_partner(active)) { + for (port = active->lag_ports; port; + port = port->next_port_in_aggregator) { + __enable_port(port); + } + *update_slave_arr = true; + } + } + + rcu_read_unlock(); + + bond_3ad_set_carrier(bond); +} + +/** + * ad_clear_agg - clear a given aggregator's parameters + * @aggregator: the aggregator we're looking at + */ +static void ad_clear_agg(struct aggregator *aggregator) +{ + if (aggregator) { + aggregator->is_individual = false; + aggregator->actor_admin_aggregator_key = 0; + aggregator->actor_oper_aggregator_key = 0; + eth_zero_addr(aggregator->partner_system.mac_addr_value); + aggregator->partner_system_priority = 0; + aggregator->partner_oper_aggregator_key = 0; + aggregator->receive_state = 0; + aggregator->transmit_state = 0; + aggregator->lag_ports = NULL; + aggregator->is_active = 0; + aggregator->num_of_ports = 0; + pr_debug("%s: LAG %d was cleared\n", + aggregator->slave ? + aggregator->slave->dev->name : "NULL", + aggregator->aggregator_identifier); + } +} + +/** + * ad_initialize_agg - initialize a given aggregator's parameters + * @aggregator: the aggregator we're looking at + */ +static void ad_initialize_agg(struct aggregator *aggregator) +{ + if (aggregator) { + ad_clear_agg(aggregator); + + eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value); + aggregator->aggregator_identifier = 0; + aggregator->slave = NULL; + } +} + +/** + * ad_initialize_port - initialize a given port's parameters + * @port: the port we're looking at + * @lacp_fast: boolean. whether fast periodic should be used + */ +static void ad_initialize_port(struct port *port, int lacp_fast) +{ + static const struct port_params tmpl = { + .system_priority = 0xffff, + .key = 1, + .port_number = 1, + .port_priority = 0xff, + .port_state = 1, + }; + static const struct lacpdu lacpdu = { + .subtype = 0x01, + .version_number = 0x01, + .tlv_type_actor_info = 0x01, + .actor_information_length = 0x14, + .tlv_type_partner_info = 0x02, + .partner_information_length = 0x14, + .tlv_type_collector_info = 0x03, + .collector_information_length = 0x10, + .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY), + }; + + if (port) { + port->actor_port_priority = 0xff; + port->actor_port_aggregator_identifier = 0; + port->ntt = false; + port->actor_admin_port_state = LACP_STATE_AGGREGATION | + LACP_STATE_LACP_ACTIVITY; + port->actor_oper_port_state = LACP_STATE_AGGREGATION | + LACP_STATE_LACP_ACTIVITY; + + if (lacp_fast) + port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; + + memcpy(&port->partner_admin, &tmpl, sizeof(tmpl)); + memcpy(&port->partner_oper, &tmpl, sizeof(tmpl)); + + port->is_enabled = true; + /* private parameters */ + port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED; + port->sm_rx_state = 0; + port->sm_rx_timer_counter = 0; + port->sm_periodic_state = 0; + port->sm_periodic_timer_counter = 0; + port->sm_mux_state = 0; + port->sm_mux_timer_counter = 0; + port->sm_tx_state = 0; + port->aggregator = NULL; + port->next_port_in_aggregator = NULL; + port->transaction_id = 0; + + port->sm_churn_actor_timer_counter = 0; + port->sm_churn_actor_state = 0; + port->churn_actor_count = 0; + port->sm_churn_partner_timer_counter = 0; + port->sm_churn_partner_state = 0; + port->churn_partner_count = 0; + + memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu)); + } +} + +/** + * ad_enable_collecting_distributing - enable a port's transmit/receive + * @port: the port we're looking at + * @update_slave_arr: Does slave array need update? + * + * Enable @port if it's in an active aggregator + */ +static void ad_enable_collecting_distributing(struct port *port, + bool *update_slave_arr) +{ + if (port->aggregator->is_active) { + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Enabling port %d (LAG %d)\n", + port->actor_port_number, + port->aggregator->aggregator_identifier); + __enable_port(port); + /* Slave array needs update */ + *update_slave_arr = true; + } +} + +/** + * ad_disable_collecting_distributing - disable a port's transmit/receive + * @port: the port we're looking at + * @update_slave_arr: Does slave array need update? + */ +static void ad_disable_collecting_distributing(struct port *port, + bool *update_slave_arr) +{ + if (port->aggregator && + !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system), + &(null_mac_addr))) { + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Disabling port %d (LAG %d)\n", + port->actor_port_number, + port->aggregator->aggregator_identifier); + __disable_port(port); + /* Slave array needs an update */ + *update_slave_arr = true; + } +} + +/** + * ad_marker_info_received - handle receive of a Marker information frame + * @marker_info: Marker info received + * @port: the port we're looking at + */ +static void ad_marker_info_received(struct bond_marker *marker_info, + struct port *port) +{ + struct bond_marker marker; + + atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx); + atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx); + + /* copy the received marker data to the response marker */ + memcpy(&marker, marker_info, sizeof(struct bond_marker)); + /* change the marker subtype to marker response */ + marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE; + + /* send the marker response */ + if (ad_marker_send(port, &marker) >= 0) + slave_dbg(port->slave->bond->dev, port->slave->dev, + "Sent Marker Response on port %d\n", + port->actor_port_number); +} + +/** + * ad_marker_response_received - handle receive of a marker response frame + * @marker: marker PDU received + * @port: the port we're looking at + * + * This function does nothing since we decided not to implement send and handle + * response for marker PDU's, in this stage, but only to respond to marker + * information. + */ +static void ad_marker_response_received(struct bond_marker *marker, + struct port *port) +{ + atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx); + atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx); + + /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */ +} + +/* ========= AD exported functions to the main bonding code ========= */ + +/* Check aggregators status in team every T seconds */ +#define AD_AGGREGATOR_SELECTION_TIMER 8 + +/** + * bond_3ad_initiate_agg_selection - initate aggregator selection + * @bond: bonding struct + * @timeout: timeout value to set + * + * Set the aggregation selection timer, to initiate an agg selection in + * the very near future. Called during first initialization, and during + * any down to up transitions of the bond. + */ +void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout) +{ + atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout); +} + +/** + * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures + * @bond: bonding struct to work on + * @tick_resolution: tick duration (millisecond resolution) + * + * Can be called only after the mac address of the bond is set. + */ +void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution) +{ + BOND_AD_INFO(bond).aggregator_identifier = 0; + BOND_AD_INFO(bond).system.sys_priority = + bond->params.ad_actor_sys_prio; + if (is_zero_ether_addr(bond->params.ad_actor_system)) + BOND_AD_INFO(bond).system.sys_mac_addr = + *((struct mac_addr *)bond->dev->dev_addr); + else + BOND_AD_INFO(bond).system.sys_mac_addr = + *((struct mac_addr *)bond->params.ad_actor_system); + + /* initialize how many times this module is called in one + * second (should be about every 100ms) + */ + ad_ticks_per_sec = tick_resolution; + + bond_3ad_initiate_agg_selection(bond, + AD_AGGREGATOR_SELECTION_TIMER * + ad_ticks_per_sec); +} + +/** + * bond_3ad_bind_slave - initialize a slave's port + * @slave: slave struct to work on + * + * Returns: 0 on success + * < 0 on error + */ +void bond_3ad_bind_slave(struct slave *slave) +{ + struct bonding *bond = bond_get_bond_by_slave(slave); + struct port *port; + struct aggregator *aggregator; + + /* check that the slave has not been initialized yet. */ + if (SLAVE_AD_INFO(slave)->port.slave != slave) { + + /* port initialization */ + port = &(SLAVE_AD_INFO(slave)->port); + + ad_initialize_port(port, bond->params.lacp_fast); + + port->slave = slave; + port->actor_port_number = SLAVE_AD_INFO(slave)->id; + /* key is determined according to the link speed, duplex and + * user key + */ + port->actor_admin_port_key = bond->params.ad_user_port_key << 6; + ad_update_actor_keys(port, false); + /* actor system is the bond's system */ + __ad_actor_update_port(port); + /* tx timer(to verify that no more than MAX_TX_IN_SECOND + * lacpdu's are sent in one second) + */ + port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; + + __disable_port(port); + + /* aggregator initialization */ + aggregator = &(SLAVE_AD_INFO(slave)->aggregator); + + ad_initialize_agg(aggregator); + + aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr); + aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier; + aggregator->slave = slave; + aggregator->is_active = 0; + aggregator->num_of_ports = 0; + } +} + +/** + * bond_3ad_unbind_slave - deinitialize a slave's port + * @slave: slave struct to work on + * + * Search for the aggregator that is related to this port, remove the + * aggregator and assign another aggregator for other port related to it + * (if any), and remove the port. + */ +void bond_3ad_unbind_slave(struct slave *slave) +{ + struct port *port, *prev_port, *temp_port; + struct aggregator *aggregator, *new_aggregator, *temp_aggregator; + int select_new_active_agg = 0; + struct bonding *bond = slave->bond; + struct slave *slave_iter; + struct list_head *iter; + bool dummy_slave_update; /* Ignore this value as caller updates array */ + + /* Sync against bond_3ad_state_machine_handler() */ + spin_lock_bh(&bond->mode_lock); + aggregator = &(SLAVE_AD_INFO(slave)->aggregator); + port = &(SLAVE_AD_INFO(slave)->port); + + /* if slave is null, the whole port is not initialized */ + if (!port->slave) { + slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n"); + goto out; + } + + slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n", + aggregator->aggregator_identifier); + + /* Tell the partner that this port is not suitable for aggregation */ + port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; + port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; + port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; + port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION; + __update_lacpdu_from_port(port); + ad_lacpdu_send(port); + + /* check if this aggregator is occupied */ + if (aggregator->lag_ports) { + /* check if there are other ports related to this aggregator + * except the port related to this slave(thats ensure us that + * there is a reason to search for new aggregator, and that we + * will find one + */ + if ((aggregator->lag_ports != port) || + (aggregator->lag_ports->next_port_in_aggregator)) { + /* find new aggregator for the related port(s) */ + bond_for_each_slave(bond, slave_iter, iter) { + new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); + /* if the new aggregator is empty, or it is + * connected to our port only + */ + if (!new_aggregator->lag_ports || + ((new_aggregator->lag_ports == port) && + !new_aggregator->lag_ports->next_port_in_aggregator)) + break; + } + if (!slave_iter) + new_aggregator = NULL; + + /* if new aggregator found, copy the aggregator's + * parameters and connect the related lag_ports to the + * new aggregator + */ + if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) { + slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n", + aggregator->aggregator_identifier, + new_aggregator->aggregator_identifier); + + if ((new_aggregator->lag_ports == port) && + new_aggregator->is_active) { + slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); + select_new_active_agg = 1; + } + + new_aggregator->is_individual = aggregator->is_individual; + new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key; + new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key; + new_aggregator->partner_system = aggregator->partner_system; + new_aggregator->partner_system_priority = aggregator->partner_system_priority; + new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key; + new_aggregator->receive_state = aggregator->receive_state; + new_aggregator->transmit_state = aggregator->transmit_state; + new_aggregator->lag_ports = aggregator->lag_ports; + new_aggregator->is_active = aggregator->is_active; + new_aggregator->num_of_ports = aggregator->num_of_ports; + + /* update the information that is written on + * the ports about the aggregator + */ + for (temp_port = aggregator->lag_ports; temp_port; + temp_port = temp_port->next_port_in_aggregator) { + temp_port->aggregator = new_aggregator; + temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier; + } + + ad_clear_agg(aggregator); + + if (select_new_active_agg) + ad_agg_selection_logic(__get_first_agg(port), + &dummy_slave_update); + } else { + slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n"); + } + } else { + /* in case that the only port related to this + * aggregator is the one we want to remove + */ + select_new_active_agg = aggregator->is_active; + ad_clear_agg(aggregator); + if (select_new_active_agg) { + slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); + /* select new active aggregator */ + temp_aggregator = __get_first_agg(port); + if (temp_aggregator) + ad_agg_selection_logic(temp_aggregator, + &dummy_slave_update); + } + } + } + + slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number); + + /* find the aggregator that this port is connected to */ + bond_for_each_slave(bond, slave_iter, iter) { + temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); + prev_port = NULL; + /* search the port in the aggregator's related ports */ + for (temp_port = temp_aggregator->lag_ports; temp_port; + prev_port = temp_port, + temp_port = temp_port->next_port_in_aggregator) { + if (temp_port == port) { + /* the aggregator found - detach the port from + * this aggregator + */ + if (prev_port) + prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator; + else + temp_aggregator->lag_ports = temp_port->next_port_in_aggregator; + temp_aggregator->num_of_ports--; + if (__agg_active_ports(temp_aggregator) == 0) { + select_new_active_agg = temp_aggregator->is_active; + if (temp_aggregator->num_of_ports == 0) + ad_clear_agg(temp_aggregator); + if (select_new_active_agg) { + slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); + /* select new active aggregator */ + ad_agg_selection_logic(__get_first_agg(port), + &dummy_slave_update); + } + } + break; + } + } + } + port->slave = NULL; + +out: + spin_unlock_bh(&bond->mode_lock); +} + +/** + * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports + * @bond: bonding struct to work on + * + * If an ad_actor setting gets changed we need to update the individual port + * settings so the bond device will use the new values when it gets upped. + */ +void bond_3ad_update_ad_actor_settings(struct bonding *bond) +{ + struct list_head *iter; + struct slave *slave; + + ASSERT_RTNL(); + + BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio; + if (is_zero_ether_addr(bond->params.ad_actor_system)) + BOND_AD_INFO(bond).system.sys_mac_addr = + *((struct mac_addr *)bond->dev->dev_addr); + else + BOND_AD_INFO(bond).system.sys_mac_addr = + *((struct mac_addr *)bond->params.ad_actor_system); + + spin_lock_bh(&bond->mode_lock); + bond_for_each_slave(bond, slave, iter) { + struct port *port = &(SLAVE_AD_INFO(slave))->port; + + __ad_actor_update_port(port); + port->ntt = true; + } + spin_unlock_bh(&bond->mode_lock); +} + +/** + * bond_agg_timer_advance - advance agg_select_timer + * @bond: bonding structure + * + * Return true when agg_select_timer reaches 0. + */ +static bool bond_agg_timer_advance(struct bonding *bond) +{ + int val, nval; + + while (1) { + val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer); + if (!val) + return false; + nval = val - 1; + if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer, + val, nval) == val) + break; + } + return nval == 0; +} + +/** + * bond_3ad_state_machine_handler - handle state machines timeout + * @work: work context to fetch bonding struct to work on from + * + * The state machine handling concept in this module is to check every tick + * which state machine should operate any function. The execution order is + * round robin, so when we have an interaction between state machines, the + * reply of one to each other might be delayed until next tick. + * + * This function also complete the initialization when the agg_select_timer + * times out, and it selects an aggregator for the ports that are yet not + * related to any aggregator, and selects the active aggregator for a bond. + */ +void bond_3ad_state_machine_handler(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + ad_work.work); + struct aggregator *aggregator; + struct list_head *iter; + struct slave *slave; + struct port *port; + bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; + bool update_slave_arr = false; + + /* Lock to protect data accessed by all (e.g., port->sm_vars) and + * against running with bond_3ad_unbind_slave. ad_rx_machine may run + * concurrently due to incoming LACPDU as well. + */ + spin_lock_bh(&bond->mode_lock); + rcu_read_lock(); + + /* check if there are any slaves */ + if (!bond_has_slaves(bond)) + goto re_arm; + + if (bond_agg_timer_advance(bond)) { + slave = bond_first_slave_rcu(bond); + port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL; + + /* select the active aggregator for the bond */ + if (port) { + if (!port->slave) { + net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n", + bond->dev->name); + goto re_arm; + } + + aggregator = __get_first_agg(port); + ad_agg_selection_logic(aggregator, &update_slave_arr); + } + bond_3ad_set_carrier(bond); + } + + /* for each port run the state machines */ + bond_for_each_slave_rcu(bond, slave, iter) { + port = &(SLAVE_AD_INFO(slave)->port); + if (!port->slave) { + net_warn_ratelimited("%s: Warning: Found an uninitialized port\n", + bond->dev->name); + goto re_arm; + } + + ad_rx_machine(NULL, port); + ad_periodic_machine(port); + ad_port_selection_logic(port, &update_slave_arr); + ad_mux_machine(port, &update_slave_arr); + ad_tx_machine(port); + ad_churn_machine(port); + + /* turn off the BEGIN bit, since we already handled it */ + if (port->sm_vars & AD_PORT_BEGIN) + port->sm_vars &= ~AD_PORT_BEGIN; + } + +re_arm: + bond_for_each_slave_rcu(bond, slave, iter) { + if (slave->should_notify) { + should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; + break; + } + } + rcu_read_unlock(); + spin_unlock_bh(&bond->mode_lock); + + if (update_slave_arr) + bond_slave_arr_work_rearm(bond, 0); + + if (should_notify_rtnl && rtnl_trylock()) { + bond_slave_state_notify(bond); + rtnl_unlock(); + } + queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); +} + +/** + * bond_3ad_rx_indication - handle a received frame + * @lacpdu: received lacpdu + * @slave: slave struct to work on + * + * It is assumed that frames that were sent on this NIC don't returned as new + * received frames (loopback). Since only the payload is given to this + * function, it check for loopback. + */ +static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave) +{ + struct bonding *bond = slave->bond; + int ret = RX_HANDLER_ANOTHER; + struct bond_marker *marker; + struct port *port; + atomic64_t *stat; + + port = &(SLAVE_AD_INFO(slave)->port); + if (!port->slave) { + net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n", + slave->dev->name, slave->bond->dev->name); + return ret; + } + + switch (lacpdu->subtype) { + case AD_TYPE_LACPDU: + ret = RX_HANDLER_CONSUMED; + slave_dbg(slave->bond->dev, slave->dev, + "Received LACPDU on port %d\n", + port->actor_port_number); + /* Protect against concurrent state machines */ + spin_lock(&slave->bond->mode_lock); + ad_rx_machine(lacpdu, port); + spin_unlock(&slave->bond->mode_lock); + break; + case AD_TYPE_MARKER: + ret = RX_HANDLER_CONSUMED; + /* No need to convert fields to Little Endian since we + * don't use the marker's fields. + */ + marker = (struct bond_marker *)lacpdu; + switch (marker->tlv_type) { + case AD_MARKER_INFORMATION_SUBTYPE: + slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n", + port->actor_port_number); + ad_marker_info_received(marker, port); + break; + case AD_MARKER_RESPONSE_SUBTYPE: + slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n", + port->actor_port_number); + ad_marker_response_received(marker, port); + break; + default: + slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n", + port->actor_port_number); + stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx; + atomic64_inc(stat); + stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx; + atomic64_inc(stat); + } + break; + default: + atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx); + atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx); + } + + return ret; +} + +/** + * ad_update_actor_keys - Update the oper / admin keys for a port based on + * its current speed and duplex settings. + * + * @port: the port we'are looking at + * @reset: Boolean to just reset the speed and the duplex part of the key + * + * The logic to change the oper / admin keys is: + * (a) A full duplex port can participate in LACP with partner. + * (b) When the speed is changed, LACP need to be reinitiated. + */ +static void ad_update_actor_keys(struct port *port, bool reset) +{ + u8 duplex = 0; + u16 ospeed = 0, speed = 0; + u16 old_oper_key = port->actor_oper_port_key; + + port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS); + if (!reset) { + speed = __get_link_speed(port); + ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1; + duplex = __get_duplex(port); + port->actor_admin_port_key |= (speed << 1) | duplex; + } + port->actor_oper_port_key = port->actor_admin_port_key; + + if (old_oper_key != port->actor_oper_port_key) { + /* Only 'duplex' port participates in LACP */ + if (duplex) + port->sm_vars |= AD_PORT_LACP_ENABLED; + else + port->sm_vars &= ~AD_PORT_LACP_ENABLED; + + if (!reset) { + if (!speed) { + slave_err(port->slave->bond->dev, + port->slave->dev, + "speed changed to 0 on port %d\n", + port->actor_port_number); + } else if (duplex && ospeed != speed) { + /* Speed change restarts LACP state-machine */ + port->sm_vars |= AD_PORT_BEGIN; + } + } + } +} + +/** + * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex + * change indication + * + * @slave: slave struct to work on + * + * Handle reselection of aggregator (if needed) for this port. + */ +void bond_3ad_adapter_speed_duplex_changed(struct slave *slave) +{ + struct port *port; + + port = &(SLAVE_AD_INFO(slave)->port); + + /* if slave is null, the whole port is not initialized */ + if (!port->slave) { + slave_warn(slave->bond->dev, slave->dev, + "speed/duplex changed for uninitialized port\n"); + return; + } + + spin_lock_bh(&slave->bond->mode_lock); + ad_update_actor_keys(port, false); + spin_unlock_bh(&slave->bond->mode_lock); + slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n", + port->actor_port_number); +} + +/** + * bond_3ad_handle_link_change - handle a slave's link status change indication + * @slave: slave struct to work on + * @link: whether the link is now up or down + * + * Handle reselection of aggregator (if needed) for this port. + */ +void bond_3ad_handle_link_change(struct slave *slave, char link) +{ + struct aggregator *agg; + struct port *port; + bool dummy; + + port = &(SLAVE_AD_INFO(slave)->port); + + /* if slave is null, the whole port is not initialized */ + if (!port->slave) { + slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n"); + return; + } + + spin_lock_bh(&slave->bond->mode_lock); + /* on link down we are zeroing duplex and speed since + * some of the adaptors(ce1000.lan) report full duplex/speed + * instead of N/A(duplex) / 0(speed). + * + * on link up we are forcing recheck on the duplex and speed since + * some of he adaptors(ce1000.lan) report. + */ + if (link == BOND_LINK_UP) { + port->is_enabled = true; + ad_update_actor_keys(port, false); + } else { + /* link has failed */ + port->is_enabled = false; + ad_update_actor_keys(port, true); + } + agg = __get_first_agg(port); + ad_agg_selection_logic(agg, &dummy); + + spin_unlock_bh(&slave->bond->mode_lock); + + slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n", + port->actor_port_number, + link == BOND_LINK_UP ? "UP" : "DOWN"); + + /* RTNL is held and mode_lock is released so it's safe + * to update slave_array here. + */ + bond_update_slave_arr(slave->bond, NULL); +} + +/** + * bond_3ad_set_carrier - set link state for bonding master + * @bond: bonding structure + * + * if we have an active aggregator, we're up, if not, we're down. + * Presumes that we cannot have an active aggregator if there are + * no slaves with link up. + * + * This behavior complies with IEEE 802.3 section 43.3.9. + * + * Called by bond_set_carrier(). Return zero if carrier state does not + * change, nonzero if it does. + */ +int bond_3ad_set_carrier(struct bonding *bond) +{ + struct aggregator *active; + struct slave *first_slave; + int ret = 1; + + rcu_read_lock(); + first_slave = bond_first_slave_rcu(bond); + if (!first_slave) { + ret = 0; + goto out; + } + active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator)); + if (active) { + /* are enough slaves available to consider link up? */ + if (__agg_active_ports(active) < bond->params.min_links) { + if (netif_carrier_ok(bond->dev)) { + netif_carrier_off(bond->dev); + goto out; + } + } else if (!netif_carrier_ok(bond->dev)) { + netif_carrier_on(bond->dev); + goto out; + } + } else if (netif_carrier_ok(bond->dev)) { + netif_carrier_off(bond->dev); + } +out: + rcu_read_unlock(); + return ret; +} + +/** + * __bond_3ad_get_active_agg_info - get information of the active aggregator + * @bond: bonding struct to work on + * @ad_info: ad_info struct to fill with the bond's info + * + * Returns: 0 on success + * < 0 on error + */ +int __bond_3ad_get_active_agg_info(struct bonding *bond, + struct ad_info *ad_info) +{ + struct aggregator *aggregator = NULL; + struct list_head *iter; + struct slave *slave; + struct port *port; + + bond_for_each_slave_rcu(bond, slave, iter) { + port = &(SLAVE_AD_INFO(slave)->port); + if (port->aggregator && port->aggregator->is_active) { + aggregator = port->aggregator; + break; + } + } + + if (!aggregator) + return -1; + + ad_info->aggregator_id = aggregator->aggregator_identifier; + ad_info->ports = __agg_active_ports(aggregator); + ad_info->actor_key = aggregator->actor_oper_aggregator_key; + ad_info->partner_key = aggregator->partner_oper_aggregator_key; + ether_addr_copy(ad_info->partner_system, + aggregator->partner_system.mac_addr_value); + return 0; +} + +int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info) +{ + int ret; + + rcu_read_lock(); + ret = __bond_3ad_get_active_agg_info(bond, ad_info); + rcu_read_unlock(); + + return ret; +} + +int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct lacpdu *lacpdu, _lacpdu; + + if (skb->protocol != PKT_TYPE_LACPDU) + return RX_HANDLER_ANOTHER; + + if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr)) + return RX_HANDLER_ANOTHER; + + lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu); + if (!lacpdu) { + atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx); + atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx); + return RX_HANDLER_ANOTHER; + } + + return bond_3ad_rx_indication(lacpdu, slave); +} + +/** + * bond_3ad_update_lacp_rate - change the lacp rate + * @bond: bonding struct + * + * When modify lacp_rate parameter via sysfs, + * update actor_oper_port_state of each port. + * + * Hold bond->mode_lock, + * so we can modify port->actor_oper_port_state, + * no matter bond is up or down. + */ +void bond_3ad_update_lacp_rate(struct bonding *bond) +{ + struct port *port = NULL; + struct list_head *iter; + struct slave *slave; + int lacp_fast; + + lacp_fast = bond->params.lacp_fast; + spin_lock_bh(&bond->mode_lock); + bond_for_each_slave(bond, slave, iter) { + port = &(SLAVE_AD_INFO(slave)->port); + if (lacp_fast) + port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; + else + port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT; + } + spin_unlock_bh(&bond->mode_lock); +} + +size_t bond_3ad_stats_size(void) +{ + return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */ + nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */ + nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */ +} + +int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats) +{ + u64 val; + + val = atomic64_read(&stats->lacpdu_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->lacpdu_tx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->lacpdu_unknown_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->lacpdu_illegal_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + + val = atomic64_read(&stats->marker_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->marker_tx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->marker_resp_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->marker_resp_tx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + val = atomic64_read(&stats->marker_unknown_rx); + if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val, + BOND_3AD_STAT_PAD)) + return -EMSGSIZE; + + return 0; +} diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c new file mode 100644 index 000000000..64ba46574 --- /dev/null +++ b/drivers/net/bonding/bond_alb.c @@ -0,0 +1,1830 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. + */ + +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/pkt_sched.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/if_bonding.h> +#include <linux/if_vlan.h> +#include <linux/in.h> +#include <net/ipx.h> +#include <net/arp.h> +#include <net/ipv6.h> +#include <asm/byteorder.h> +#include <net/bonding.h> +#include <net/bond_alb.h> + +static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = { + 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 +}; +static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; + +#pragma pack(1) +struct learning_pkt { + u8 mac_dst[ETH_ALEN]; + u8 mac_src[ETH_ALEN]; + __be16 type; + u8 padding[ETH_ZLEN - ETH_HLEN]; +}; + +struct arp_pkt { + __be16 hw_addr_space; + __be16 prot_addr_space; + u8 hw_addr_len; + u8 prot_addr_len; + __be16 op_code; + u8 mac_src[ETH_ALEN]; /* sender hardware address */ + __be32 ip_src; /* sender IP address */ + u8 mac_dst[ETH_ALEN]; /* target hardware address */ + __be32 ip_dst; /* target IP address */ +}; +#pragma pack() + +/* Forward declaration */ +static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], + bool strict_match); +static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); +static void rlb_src_unlink(struct bonding *bond, u32 index); +static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, + u32 ip_dst_hash); + +static inline u8 _simple_hash(const u8 *hash_start, int hash_size) +{ + int i; + u8 hash = 0; + + for (i = 0; i < hash_size; i++) + hash ^= hash_start[i]; + + return hash; +} + +/*********************** tlb specific functions ***************************/ + +static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) +{ + if (save_load) { + entry->load_history = 1 + entry->tx_bytes / + BOND_TLB_REBALANCE_INTERVAL; + entry->tx_bytes = 0; + } + + entry->tx_slave = NULL; + entry->next = TLB_NULL_INDEX; + entry->prev = TLB_NULL_INDEX; +} + +static inline void tlb_init_slave(struct slave *slave) +{ + SLAVE_TLB_INFO(slave).load = 0; + SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; +} + +static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, + int save_load) +{ + struct tlb_client_info *tx_hash_table; + u32 index; + + /* clear slave from tx_hashtbl */ + tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; + + /* skip this if we've already freed the tx hash table */ + if (tx_hash_table) { + index = SLAVE_TLB_INFO(slave).head; + while (index != TLB_NULL_INDEX) { + u32 next_index = tx_hash_table[index].next; + tlb_init_table_entry(&tx_hash_table[index], save_load); + index = next_index; + } + } + + tlb_init_slave(slave); +} + +static void tlb_clear_slave(struct bonding *bond, struct slave *slave, + int save_load) +{ + spin_lock_bh(&bond->mode_lock); + __tlb_clear_slave(bond, slave, save_load); + spin_unlock_bh(&bond->mode_lock); +} + +/* Must be called before starting the monitor timer */ +static int tlb_initialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); + struct tlb_client_info *new_hashtbl; + int i; + + new_hashtbl = kzalloc(size, GFP_KERNEL); + if (!new_hashtbl) + return -ENOMEM; + + spin_lock_bh(&bond->mode_lock); + + bond_info->tx_hashtbl = new_hashtbl; + + for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) + tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); + + spin_unlock_bh(&bond->mode_lock); + + return 0; +} + +/* Must be called only after all slaves have been released */ +static void tlb_deinitialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + spin_lock_bh(&bond->mode_lock); + + kfree(bond_info->tx_hashtbl); + bond_info->tx_hashtbl = NULL; + + spin_unlock_bh(&bond->mode_lock); +} + +static long long compute_gap(struct slave *slave) +{ + return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ + (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ +} + +static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) +{ + struct slave *slave, *least_loaded; + struct list_head *iter; + long long max_gap; + + least_loaded = NULL; + max_gap = LLONG_MIN; + + /* Find the slave with the largest gap */ + bond_for_each_slave_rcu(bond, slave, iter) { + if (bond_slave_can_tx(slave)) { + long long gap = compute_gap(slave); + + if (max_gap < gap) { + least_loaded = slave; + max_gap = gap; + } + } + } + + return least_loaded; +} + +static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, + u32 skb_len) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct tlb_client_info *hash_table; + struct slave *assigned_slave; + + hash_table = bond_info->tx_hashtbl; + assigned_slave = hash_table[hash_index].tx_slave; + if (!assigned_slave) { + assigned_slave = tlb_get_least_loaded_slave(bond); + + if (assigned_slave) { + struct tlb_slave_info *slave_info = + &(SLAVE_TLB_INFO(assigned_slave)); + u32 next_index = slave_info->head; + + hash_table[hash_index].tx_slave = assigned_slave; + hash_table[hash_index].next = next_index; + hash_table[hash_index].prev = TLB_NULL_INDEX; + + if (next_index != TLB_NULL_INDEX) + hash_table[next_index].prev = hash_index; + + slave_info->head = hash_index; + slave_info->load += + hash_table[hash_index].load_history; + } + } + + if (assigned_slave) + hash_table[hash_index].tx_bytes += skb_len; + + return assigned_slave; +} + +static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, + u32 skb_len) +{ + struct slave *tx_slave; + + /* We don't need to disable softirq here, becase + * tlb_choose_channel() is only called by bond_alb_xmit() + * which already has softirq disabled. + */ + spin_lock(&bond->mode_lock); + tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); + spin_unlock(&bond->mode_lock); + + return tx_slave; +} + +/*********************** rlb specific functions ***************************/ + +/* when an ARP REPLY is received from a client update its info + * in the rx_hashtbl + */ +static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *client_info; + u32 hash_index; + + spin_lock_bh(&bond->mode_lock); + + hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if ((client_info->assigned) && + (client_info->ip_src == arp->ip_dst) && + (client_info->ip_dst == arp->ip_src) && + (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { + /* update the clients MAC address */ + ether_addr_copy(client_info->mac_dst, arp->mac_src); + client_info->ntt = 1; + bond_info->rx_ntt = 1; + } + + spin_unlock_bh(&bond->mode_lock); +} + +static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct arp_pkt *arp, _arp; + + if (skb->protocol != cpu_to_be16(ETH_P_ARP)) + goto out; + + arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); + if (!arp) + goto out; + + /* We received an ARP from arp->ip_src. + * We might have used this IP address previously (on the bonding host + * itself or on a system that is bridged together with the bond). + * However, if arp->mac_src is different than what is stored in + * rx_hashtbl, some other host is now using the IP and we must prevent + * sending out client updates with this IP address and the old MAC + * address. + * Clean up all hash table entries that have this address as ip_src but + * have a different mac_src. + */ + rlb_purge_src_ip(bond, arp); + + if (arp->op_code == htons(ARPOP_REPLY)) { + /* update rx hash table for this ARP */ + rlb_update_entry_from_arp(bond, arp); + slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n"); + } +out: + return RX_HANDLER_ANOTHER; +} + +/* Caller must hold rcu_read_lock() */ +static struct slave *__rlb_next_rx_slave(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct slave *before = NULL, *rx_slave = NULL, *slave; + struct list_head *iter; + bool found = false; + + bond_for_each_slave_rcu(bond, slave, iter) { + if (!bond_slave_can_tx(slave)) + continue; + if (!found) { + if (!before || before->speed < slave->speed) + before = slave; + } else { + if (!rx_slave || rx_slave->speed < slave->speed) + rx_slave = slave; + } + if (slave == bond_info->rx_slave) + found = true; + } + /* we didn't find anything after the current or we have something + * better before and up to the current slave + */ + if (!rx_slave || (before && rx_slave->speed < before->speed)) + rx_slave = before; + + if (rx_slave) + bond_info->rx_slave = rx_slave; + + return rx_slave; +} + +/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ +static struct slave *rlb_next_rx_slave(struct bonding *bond) +{ + struct slave *rx_slave; + + ASSERT_RTNL(); + + rcu_read_lock(); + rx_slave = __rlb_next_rx_slave(bond); + rcu_read_unlock(); + + return rx_slave; +} + +/* teach the switch the mac of a disabled slave + * on the primary for fault tolerance + * + * Caller must hold RTNL + */ +static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) +{ + struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); + + if (!curr_active) + return; + + if (!bond->alb_info.primary_is_promisc) { + if (!dev_set_promiscuity(curr_active->dev, 1)) + bond->alb_info.primary_is_promisc = 1; + else + bond->alb_info.primary_is_promisc = 0; + } + + bond->alb_info.rlb_promisc_timeout_counter = 0; + + alb_send_learning_packets(curr_active, addr, true); +} + +/* slave being removed should not be active at this point + * + * Caller must hold rtnl. + */ +static void rlb_clear_slave(struct bonding *bond, struct slave *slave) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *rx_hash_table; + u32 index, next_index; + + /* clear slave from rx_hashtbl */ + spin_lock_bh(&bond->mode_lock); + + rx_hash_table = bond_info->rx_hashtbl; + index = bond_info->rx_hashtbl_used_head; + for (; index != RLB_NULL_INDEX; index = next_index) { + next_index = rx_hash_table[index].used_next; + if (rx_hash_table[index].slave == slave) { + struct slave *assigned_slave = rlb_next_rx_slave(bond); + + if (assigned_slave) { + rx_hash_table[index].slave = assigned_slave; + if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) { + bond_info->rx_hashtbl[index].ntt = 1; + bond_info->rx_ntt = 1; + /* A slave has been removed from the + * table because it is either disabled + * or being released. We must retry the + * update to avoid clients from not + * being updated & disconnecting when + * there is stress + */ + bond_info->rlb_update_retry_counter = + RLB_UPDATE_RETRY; + } + } else { /* there is no active slave */ + rx_hash_table[index].slave = NULL; + } + } + } + + spin_unlock_bh(&bond->mode_lock); + + if (slave != rtnl_dereference(bond->curr_active_slave)) + rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); +} + +static void rlb_update_client(struct rlb_client_info *client_info) +{ + int i; + + if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst)) + return; + + for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { + struct sk_buff *skb; + + skb = arp_create(ARPOP_REPLY, ETH_P_ARP, + client_info->ip_dst, + client_info->slave->dev, + client_info->ip_src, + client_info->mac_dst, + client_info->slave->dev->dev_addr, + client_info->mac_dst); + if (!skb) { + slave_err(client_info->slave->bond->dev, + client_info->slave->dev, + "failed to create an ARP packet\n"); + continue; + } + + skb->dev = client_info->slave->dev; + + if (client_info->vlan_id) { + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), + client_info->vlan_id); + } + + arp_xmit(skb); + } +} + +/* sends ARP REPLIES that update the clients that need updating */ +static void rlb_update_rx_clients(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *client_info; + u32 hash_index; + + spin_lock_bh(&bond->mode_lock); + + hash_index = bond_info->rx_hashtbl_used_head; + for (; hash_index != RLB_NULL_INDEX; + hash_index = client_info->used_next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + if (client_info->ntt) { + rlb_update_client(client_info); + if (bond_info->rlb_update_retry_counter == 0) + client_info->ntt = 0; + } + } + + /* do not update the entries again until this counter is zero so that + * not to confuse the clients. + */ + bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; + + spin_unlock_bh(&bond->mode_lock); +} + +/* The slave was assigned a new mac address - update the clients */ +static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *client_info; + int ntt = 0; + u32 hash_index; + + spin_lock_bh(&bond->mode_lock); + + hash_index = bond_info->rx_hashtbl_used_head; + for (; hash_index != RLB_NULL_INDEX; + hash_index = client_info->used_next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if ((client_info->slave == slave) && + is_valid_ether_addr(client_info->mac_dst)) { + client_info->ntt = 1; + ntt = 1; + } + } + + /* update the team's flag only after the whole iteration */ + if (ntt) { + bond_info->rx_ntt = 1; + /* fasten the change */ + bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; + } + + spin_unlock_bh(&bond->mode_lock); +} + +/* mark all clients using src_ip to be updated */ +static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *client_info; + u32 hash_index; + + spin_lock(&bond->mode_lock); + + hash_index = bond_info->rx_hashtbl_used_head; + for (; hash_index != RLB_NULL_INDEX; + hash_index = client_info->used_next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if (!client_info->slave) { + netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); + continue; + } + /* update all clients using this src_ip, that are not assigned + * to the team's address (curr_active_slave) and have a known + * unicast mac address. + */ + if ((client_info->ip_src == src_ip) && + !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, + bond->dev->dev_addr) && + is_valid_ether_addr(client_info->mac_dst)) { + client_info->ntt = 1; + bond_info->rx_ntt = 1; + } + } + + spin_unlock(&bond->mode_lock); +} + +static struct slave *rlb_choose_channel(struct sk_buff *skb, + struct bonding *bond, + const struct arp_pkt *arp) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct slave *assigned_slave, *curr_active_slave; + struct rlb_client_info *client_info; + u32 hash_index = 0; + + spin_lock(&bond->mode_lock); + + curr_active_slave = rcu_dereference(bond->curr_active_slave); + + hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); + client_info = &(bond_info->rx_hashtbl[hash_index]); + + if (client_info->assigned) { + if ((client_info->ip_src == arp->ip_src) && + (client_info->ip_dst == arp->ip_dst)) { + /* the entry is already assigned to this client */ + if (!is_broadcast_ether_addr(arp->mac_dst)) { + /* update mac address from arp */ + ether_addr_copy(client_info->mac_dst, arp->mac_dst); + } + ether_addr_copy(client_info->mac_src, arp->mac_src); + + assigned_slave = client_info->slave; + if (assigned_slave) { + spin_unlock(&bond->mode_lock); + return assigned_slave; + } + } else { + /* the entry is already assigned to some other client, + * move the old client to primary (curr_active_slave) so + * that the new client can be assigned to this entry. + */ + if (curr_active_slave && + client_info->slave != curr_active_slave) { + client_info->slave = curr_active_slave; + rlb_update_client(client_info); + } + } + } + /* assign a new slave */ + assigned_slave = __rlb_next_rx_slave(bond); + + if (assigned_slave) { + if (!(client_info->assigned && + client_info->ip_src == arp->ip_src)) { + /* ip_src is going to be updated, + * fix the src hash list + */ + u32 hash_src = _simple_hash((u8 *)&arp->ip_src, + sizeof(arp->ip_src)); + rlb_src_unlink(bond, hash_index); + rlb_src_link(bond, hash_src, hash_index); + } + + client_info->ip_src = arp->ip_src; + client_info->ip_dst = arp->ip_dst; + /* arp->mac_dst is broadcast for arp reqeusts. + * will be updated with clients actual unicast mac address + * upon receiving an arp reply. + */ + ether_addr_copy(client_info->mac_dst, arp->mac_dst); + ether_addr_copy(client_info->mac_src, arp->mac_src); + client_info->slave = assigned_slave; + + if (is_valid_ether_addr(client_info->mac_dst)) { + client_info->ntt = 1; + bond->alb_info.rx_ntt = 1; + } else { + client_info->ntt = 0; + } + + if (vlan_get_tag(skb, &client_info->vlan_id)) + client_info->vlan_id = 0; + + if (!client_info->assigned) { + u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; + bond_info->rx_hashtbl_used_head = hash_index; + client_info->used_next = prev_tbl_head; + if (prev_tbl_head != RLB_NULL_INDEX) { + bond_info->rx_hashtbl[prev_tbl_head].used_prev = + hash_index; + } + client_info->assigned = 1; + } + } + + spin_unlock(&bond->mode_lock); + + return assigned_slave; +} + +/* chooses (and returns) transmit channel for arp reply + * does not choose channel for other arp types since they are + * sent on the curr_active_slave + */ +static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) +{ + struct slave *tx_slave = NULL; + struct arp_pkt *arp; + + if (!pskb_network_may_pull(skb, sizeof(*arp))) + return NULL; + arp = (struct arp_pkt *)skb_network_header(skb); + + /* Don't modify or load balance ARPs that do not originate + * from the bond itself or a VLAN directly above the bond. + */ + if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) + return NULL; + + if (arp->op_code == htons(ARPOP_REPLY)) { + /* the arp must be sent on the selected rx channel */ + tx_slave = rlb_choose_channel(skb, bond, arp); + if (tx_slave) + bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr, + tx_slave->dev->addr_len); + netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n", + tx_slave ? tx_slave->dev->name : "NULL"); + } else if (arp->op_code == htons(ARPOP_REQUEST)) { + /* Create an entry in the rx_hashtbl for this client as a + * place holder. + * When the arp reply is received the entry will be updated + * with the correct unicast address of the client. + */ + tx_slave = rlb_choose_channel(skb, bond, arp); + + /* The ARP reply packets must be delayed so that + * they can cancel out the influence of the ARP request. + */ + bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; + + /* arp requests are broadcast and are sent on the primary + * the arp request will collapse all clients on the subnet to + * the primary slave. We must register these clients to be + * updated with their assigned mac. + */ + rlb_req_update_subnet_clients(bond, arp->ip_src); + netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n", + tx_slave ? tx_slave->dev->name : "NULL"); + } + + return tx_slave; +} + +static void rlb_rebalance(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct slave *assigned_slave; + struct rlb_client_info *client_info; + int ntt; + u32 hash_index; + + spin_lock_bh(&bond->mode_lock); + + ntt = 0; + hash_index = bond_info->rx_hashtbl_used_head; + for (; hash_index != RLB_NULL_INDEX; + hash_index = client_info->used_next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + assigned_slave = __rlb_next_rx_slave(bond); + if (assigned_slave && (client_info->slave != assigned_slave)) { + client_info->slave = assigned_slave; + if (!is_zero_ether_addr(client_info->mac_dst)) { + client_info->ntt = 1; + ntt = 1; + } + } + } + + /* update the team's flag only after the whole iteration */ + if (ntt) + bond_info->rx_ntt = 1; + spin_unlock_bh(&bond->mode_lock); +} + +/* Caller must hold mode_lock */ +static void rlb_init_table_entry_dst(struct rlb_client_info *entry) +{ + entry->used_next = RLB_NULL_INDEX; + entry->used_prev = RLB_NULL_INDEX; + entry->assigned = 0; + entry->slave = NULL; + entry->vlan_id = 0; +} +static void rlb_init_table_entry_src(struct rlb_client_info *entry) +{ + entry->src_first = RLB_NULL_INDEX; + entry->src_prev = RLB_NULL_INDEX; + entry->src_next = RLB_NULL_INDEX; +} + +static void rlb_init_table_entry(struct rlb_client_info *entry) +{ + memset(entry, 0, sizeof(struct rlb_client_info)); + rlb_init_table_entry_dst(entry); + rlb_init_table_entry_src(entry); +} + +static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + u32 next_index = bond_info->rx_hashtbl[index].used_next; + u32 prev_index = bond_info->rx_hashtbl[index].used_prev; + + if (index == bond_info->rx_hashtbl_used_head) + bond_info->rx_hashtbl_used_head = next_index; + if (prev_index != RLB_NULL_INDEX) + bond_info->rx_hashtbl[prev_index].used_next = next_index; + if (next_index != RLB_NULL_INDEX) + bond_info->rx_hashtbl[next_index].used_prev = prev_index; +} + +/* unlink a rlb hash table entry from the src list */ +static void rlb_src_unlink(struct bonding *bond, u32 index) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + u32 next_index = bond_info->rx_hashtbl[index].src_next; + u32 prev_index = bond_info->rx_hashtbl[index].src_prev; + + bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; + bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; + + if (next_index != RLB_NULL_INDEX) + bond_info->rx_hashtbl[next_index].src_prev = prev_index; + + if (prev_index == RLB_NULL_INDEX) + return; + + /* is prev_index pointing to the head of this list? */ + if (bond_info->rx_hashtbl[prev_index].src_first == index) + bond_info->rx_hashtbl[prev_index].src_first = next_index; + else + bond_info->rx_hashtbl[prev_index].src_next = next_index; + +} + +static void rlb_delete_table_entry(struct bonding *bond, u32 index) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); + + rlb_delete_table_entry_dst(bond, index); + rlb_init_table_entry_dst(entry); + + rlb_src_unlink(bond, index); +} + +/* add the rx_hashtbl[ip_dst_hash] entry to the list + * of entries with identical ip_src_hash + */ +static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + u32 next; + + bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; + next = bond_info->rx_hashtbl[ip_src_hash].src_first; + bond_info->rx_hashtbl[ip_dst_hash].src_next = next; + if (next != RLB_NULL_INDEX) + bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; + bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; +} + +/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does + * not match arp->mac_src + */ +static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); + u32 index; + + spin_lock_bh(&bond->mode_lock); + + index = bond_info->rx_hashtbl[ip_src_hash].src_first; + while (index != RLB_NULL_INDEX) { + struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); + u32 next_index = entry->src_next; + if (entry->ip_src == arp->ip_src && + !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) + rlb_delete_table_entry(bond, index); + index = next_index; + } + spin_unlock_bh(&bond->mode_lock); +} + +static int rlb_initialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *new_hashtbl; + int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); + int i; + + new_hashtbl = kmalloc(size, GFP_KERNEL); + if (!new_hashtbl) + return -1; + + spin_lock_bh(&bond->mode_lock); + + bond_info->rx_hashtbl = new_hashtbl; + + bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; + + for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) + rlb_init_table_entry(bond_info->rx_hashtbl + i); + + spin_unlock_bh(&bond->mode_lock); + + /* register to receive ARPs */ + bond->recv_probe = rlb_arp_recv; + + return 0; +} + +static void rlb_deinitialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + spin_lock_bh(&bond->mode_lock); + + kfree(bond_info->rx_hashtbl); + bond_info->rx_hashtbl = NULL; + bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; + + spin_unlock_bh(&bond->mode_lock); +} + +static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + u32 curr_index; + + spin_lock_bh(&bond->mode_lock); + + curr_index = bond_info->rx_hashtbl_used_head; + while (curr_index != RLB_NULL_INDEX) { + struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); + u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; + + if (curr->vlan_id == vlan_id) + rlb_delete_table_entry(bond, curr_index); + + curr_index = next_index; + } + + spin_unlock_bh(&bond->mode_lock); +} + +/*********************** tlb/rlb shared functions *********************/ + +static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], + __be16 vlan_proto, u16 vid) +{ + struct learning_pkt pkt; + struct sk_buff *skb; + int size = sizeof(struct learning_pkt); + + memset(&pkt, 0, size); + ether_addr_copy(pkt.mac_dst, mac_addr); + ether_addr_copy(pkt.mac_src, mac_addr); + pkt.type = cpu_to_be16(ETH_P_LOOPBACK); + + skb = dev_alloc_skb(size); + if (!skb) + return; + + skb_put_data(skb, &pkt, size); + + skb_reset_mac_header(skb); + skb->network_header = skb->mac_header + ETH_HLEN; + skb->protocol = pkt.type; + skb->priority = TC_PRIO_CONTROL; + skb->dev = slave->dev; + + slave_dbg(slave->bond->dev, slave->dev, + "Send learning packet: mac %pM vlan %d\n", mac_addr, vid); + + if (vid) + __vlan_hwaccel_put_tag(skb, vlan_proto, vid); + + dev_queue_xmit(skb); +} + +struct alb_walk_data { + struct bonding *bond; + struct slave *slave; + u8 *mac_addr; + bool strict_match; +}; + +static int alb_upper_dev_walk(struct net_device *upper, + struct netdev_nested_priv *priv) +{ + struct alb_walk_data *data = (struct alb_walk_data *)priv->data; + bool strict_match = data->strict_match; + struct bonding *bond = data->bond; + struct slave *slave = data->slave; + u8 *mac_addr = data->mac_addr; + struct bond_vlan_tag *tags; + + if (is_vlan_dev(upper) && + bond->dev->lower_level == upper->lower_level - 1) { + if (upper->addr_assign_type == NET_ADDR_STOLEN) { + alb_send_lp_vid(slave, mac_addr, + vlan_dev_vlan_proto(upper), + vlan_dev_vlan_id(upper)); + } else { + alb_send_lp_vid(slave, upper->dev_addr, + vlan_dev_vlan_proto(upper), + vlan_dev_vlan_id(upper)); + } + } + + /* If this is a macvlan device, then only send updates + * when strict_match is turned off. + */ + if (netif_is_macvlan(upper) && !strict_match) { + tags = bond_verify_device_path(bond->dev, upper, 0); + if (IS_ERR_OR_NULL(tags)) + BUG(); + alb_send_lp_vid(slave, upper->dev_addr, + tags[0].vlan_proto, tags[0].vlan_id); + kfree(tags); + } + + return 0; +} + +static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], + bool strict_match) +{ + struct bonding *bond = bond_get_bond_by_slave(slave); + struct netdev_nested_priv priv; + struct alb_walk_data data = { + .strict_match = strict_match, + .mac_addr = mac_addr, + .slave = slave, + .bond = bond, + }; + + priv.data = (void *)&data; + /* send untagged */ + alb_send_lp_vid(slave, mac_addr, 0, 0); + + /* loop through all devices and see if we need to send a packet + * for that device. + */ + rcu_read_lock(); + netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &priv); + rcu_read_unlock(); +} + +static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], + unsigned int len) +{ + struct net_device *dev = slave->dev; + struct sockaddr_storage ss; + + if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { + memcpy(dev->dev_addr, addr, len); + return 0; + } + + /* for rlb each slave must have a unique hw mac addresses so that + * each slave will receive packets destined to a different mac + */ + memcpy(ss.__data, addr, len); + ss.ss_family = dev->type; + if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) { + slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n"); + return -EOPNOTSUPP; + } + return 0; +} + +/* Swap MAC addresses between two slaves. + * + * Called with RTNL held, and no other locks. + */ +static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) +{ + u8 tmp_mac_addr[MAX_ADDR_LEN]; + + bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr, + slave1->dev->addr_len); + alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, + slave2->dev->addr_len); + alb_set_slave_mac_addr(slave2, tmp_mac_addr, + slave1->dev->addr_len); + +} + +/* Send learning packets after MAC address swap. + * + * Called with RTNL and no other locks + */ +static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, + struct slave *slave2) +{ + int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); + struct slave *disabled_slave = NULL; + + ASSERT_RTNL(); + + /* fasten the change in the switch */ + if (bond_slave_can_tx(slave1)) { + alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); + if (bond->alb_info.rlb_enabled) { + /* inform the clients that the mac address + * has changed + */ + rlb_req_update_slave_clients(bond, slave1); + } + } else { + disabled_slave = slave1; + } + + if (bond_slave_can_tx(slave2)) { + alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); + if (bond->alb_info.rlb_enabled) { + /* inform the clients that the mac address + * has changed + */ + rlb_req_update_slave_clients(bond, slave2); + } + } else { + disabled_slave = slave2; + } + + if (bond->alb_info.rlb_enabled && slaves_state_differ) { + /* A disabled slave was assigned an active mac addr */ + rlb_teach_disabled_mac_on_primary(bond, + disabled_slave->dev->dev_addr); + } +} + +/** + * alb_change_hw_addr_on_detach + * @bond: bonding we're working on + * @slave: the slave that was just detached + * + * We assume that @slave was already detached from the slave list. + * + * If @slave's permanent hw address is different both from its current + * address and from @bond's address, then somewhere in the bond there's + * a slave that has @slave's permanet address as its current address. + * We'll make sure that that slave no longer uses @slave's permanent address. + * + * Caller must hold RTNL and no other locks + */ +static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) +{ + int perm_curr_diff; + int perm_bond_diff; + struct slave *found_slave; + + perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, + slave->dev->dev_addr); + perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, + bond->dev->dev_addr); + + if (perm_curr_diff && perm_bond_diff) { + found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); + + if (found_slave) { + alb_swap_mac_addr(slave, found_slave); + alb_fasten_mac_swap(bond, slave, found_slave); + } + } +} + +/** + * alb_handle_addr_collision_on_attach + * @bond: bonding we're working on + * @slave: the slave that was just attached + * + * checks uniqueness of slave's mac address and handles the case the + * new slave uses the bonds mac address. + * + * If the permanent hw address of @slave is @bond's hw address, we need to + * find a different hw address to give @slave, that isn't in use by any other + * slave in the bond. This address must be, of course, one of the permanent + * addresses of the other slaves. + * + * We go over the slave list, and for each slave there we compare its + * permanent hw address with the current address of all the other slaves. + * If no match was found, then we've found a slave with a permanent address + * that isn't used by any other slave in the bond, so we can assign it to + * @slave. + * + * assumption: this function is called before @slave is attached to the + * bond slave list. + */ +static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) +{ + struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); + struct slave *tmp_slave1, *free_mac_slave = NULL; + struct list_head *iter; + + if (!bond_has_slaves(bond)) { + /* this is the first slave */ + return 0; + } + + /* if slave's mac address differs from bond's mac address + * check uniqueness of slave's mac address against the other + * slaves in the bond. + */ + if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { + if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) + return 0; + + /* Try setting slave mac to bond address and fall-through + * to code handling that situation below... + */ + alb_set_slave_mac_addr(slave, bond->dev->dev_addr, + bond->dev->addr_len); + } + + /* The slave's address is equal to the address of the bond. + * Search for a spare address in the bond for this slave. + */ + bond_for_each_slave(bond, tmp_slave1, iter) { + if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { + /* no slave has tmp_slave1's perm addr + * as its curr addr + */ + free_mac_slave = tmp_slave1; + break; + } + + if (!has_bond_addr) { + if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, + bond->dev->dev_addr)) { + + has_bond_addr = tmp_slave1; + } + } + } + + if (free_mac_slave) { + alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, + free_mac_slave->dev->addr_len); + + slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n", + free_mac_slave->dev->name); + + } else if (has_bond_addr) { + slave_err(bond->dev, slave->dev, "the slave hw address is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n"); + return -EFAULT; + } + + return 0; +} + +/** + * alb_set_mac_address + * @bond: bonding we're working on + * @addr: MAC address to set + * + * In TLB mode all slaves are configured to the bond's hw address, but set + * their dev_addr field to different addresses (based on their permanent hw + * addresses). + * + * For each slave, this function sets the interface to the new address and then + * changes its dev_addr field to its previous value. + * + * Unwinding assumes bond's mac address has not yet changed. + */ +static int alb_set_mac_address(struct bonding *bond, void *addr) +{ + struct slave *slave, *rollback_slave; + struct list_head *iter; + struct sockaddr_storage ss; + char tmp_addr[MAX_ADDR_LEN]; + int res; + + if (bond->alb_info.rlb_enabled) + return 0; + + bond_for_each_slave(bond, slave, iter) { + /* save net_device's current hw address */ + bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr, + slave->dev->addr_len); + + res = dev_set_mac_address(slave->dev, addr, NULL); + + /* restore net_device's hw address */ + bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr, + slave->dev->addr_len); + + if (res) + goto unwind; + } + + return 0; + +unwind: + memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len); + ss.ss_family = bond->dev->type; + + /* unwind from head to the slave that failed */ + bond_for_each_slave(bond, rollback_slave, iter) { + if (rollback_slave == slave) + break; + bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr, + rollback_slave->dev->addr_len); + dev_set_mac_address(rollback_slave->dev, + (struct sockaddr *)&ss, NULL); + bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr, + rollback_slave->dev->addr_len); + } + + return res; +} + +/************************ exported alb funcions ************************/ + +int bond_alb_initialize(struct bonding *bond, int rlb_enabled) +{ + int res; + + res = tlb_initialize(bond); + if (res) + return res; + + if (rlb_enabled) { + res = rlb_initialize(bond); + if (res) { + tlb_deinitialize(bond); + return res; + } + bond->alb_info.rlb_enabled = 1; + } else { + bond->alb_info.rlb_enabled = 0; + } + + return 0; +} + +void bond_alb_deinitialize(struct bonding *bond) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + tlb_deinitialize(bond); + + if (bond_info->rlb_enabled) + rlb_deinitialize(bond); +} + +static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, + struct slave *tx_slave) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct ethhdr *eth_data = eth_hdr(skb); + + if (!tx_slave) { + /* unbalanced or unassigned, send through primary */ + tx_slave = rcu_dereference(bond->curr_active_slave); + if (bond->params.tlb_dynamic_lb) + bond_info->unbalanced_load += skb->len; + } + + if (tx_slave && bond_slave_can_tx(tx_slave)) { + if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { + ether_addr_copy(eth_data->h_source, + tx_slave->dev->dev_addr); + } + + return bond_dev_queue_xmit(bond, skb, tx_slave->dev); + } + + if (tx_slave && bond->params.tlb_dynamic_lb) { + spin_lock(&bond->mode_lock); + __tlb_clear_slave(bond, tx_slave, 0); + spin_unlock(&bond->mode_lock); + } + + /* no suitable interface, frame not sent */ + return bond_tx_drop(bond->dev, skb); +} + +struct slave *bond_xmit_tlb_slave_get(struct bonding *bond, + struct sk_buff *skb) +{ + struct slave *tx_slave = NULL; + struct ethhdr *eth_data; + u32 hash_index; + + skb_reset_mac_header(skb); + eth_data = eth_hdr(skb); + + /* Do not TX balance any multicast or broadcast */ + if (!is_multicast_ether_addr(eth_data->h_dest)) { + switch (skb->protocol) { + case htons(ETH_P_IP): + case htons(ETH_P_IPX): + /* In case of IPX, it will falback to L2 hash */ + case htons(ETH_P_IPV6): + hash_index = bond_xmit_hash(bond, skb); + if (bond->params.tlb_dynamic_lb) { + tx_slave = tlb_choose_channel(bond, + hash_index & 0xFF, + skb->len); + } else { + struct bond_up_slave *slaves; + unsigned int count; + + slaves = rcu_dereference(bond->usable_slaves); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (likely(count)) + tx_slave = slaves->arr[hash_index % + count]; + } + break; + } + } + return tx_slave; +} + +netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *tx_slave; + + tx_slave = bond_xmit_tlb_slave_get(bond, skb); + return bond_do_alb_xmit(skb, bond, tx_slave); +} + +struct slave *bond_xmit_alb_slave_get(struct bonding *bond, + struct sk_buff *skb) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + static const __be32 ip_bcast = htonl(0xffffffff); + struct slave *tx_slave = NULL; + const u8 *hash_start = NULL; + bool do_tx_balance = true; + struct ethhdr *eth_data; + u32 hash_index = 0; + int hash_size = 0; + + skb_reset_mac_header(skb); + eth_data = eth_hdr(skb); + + switch (ntohs(skb->protocol)) { + case ETH_P_IP: { + const struct iphdr *iph; + + if (is_broadcast_ether_addr(eth_data->h_dest) || + !pskb_network_may_pull(skb, sizeof(*iph))) { + do_tx_balance = false; + break; + } + iph = ip_hdr(skb); + if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) { + do_tx_balance = false; + break; + } + hash_start = (char *)&(iph->daddr); + hash_size = sizeof(iph->daddr); + break; + } + case ETH_P_IPV6: { + const struct ipv6hdr *ip6hdr; + + /* IPv6 doesn't really use broadcast mac address, but leave + * that here just in case. + */ + if (is_broadcast_ether_addr(eth_data->h_dest)) { + do_tx_balance = false; + break; + } + + /* IPv6 uses all-nodes multicast as an equivalent to + * broadcasts in IPv4. + */ + if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { + do_tx_balance = false; + break; + } + + if (!pskb_network_may_pull(skb, sizeof(*ip6hdr))) { + do_tx_balance = false; + break; + } + /* Additionally, DAD probes should not be tx-balanced as that + * will lead to false positives for duplicate addresses and + * prevent address configuration from working. + */ + ip6hdr = ipv6_hdr(skb); + if (ipv6_addr_any(&ip6hdr->saddr)) { + do_tx_balance = false; + break; + } + + hash_start = (char *)&ip6hdr->daddr; + hash_size = sizeof(ip6hdr->daddr); + break; + } + case ETH_P_IPX: { + const struct ipxhdr *ipxhdr; + + if (pskb_network_may_pull(skb, sizeof(*ipxhdr))) { + do_tx_balance = false; + break; + } + ipxhdr = (struct ipxhdr *)skb_network_header(skb); + + if (ipxhdr->ipx_checksum != IPX_NO_CHECKSUM) { + /* something is wrong with this packet */ + do_tx_balance = false; + break; + } + + if (ipxhdr->ipx_type != IPX_TYPE_NCP) { + /* The only protocol worth balancing in + * this family since it has an "ARP" like + * mechanism + */ + do_tx_balance = false; + break; + } + + eth_data = eth_hdr(skb); + hash_start = (char *)eth_data->h_dest; + hash_size = ETH_ALEN; + break; + } + case ETH_P_ARP: + do_tx_balance = false; + if (bond_info->rlb_enabled) + tx_slave = rlb_arp_xmit(skb, bond); + break; + default: + do_tx_balance = false; + break; + } + + if (do_tx_balance) { + if (bond->params.tlb_dynamic_lb) { + hash_index = _simple_hash(hash_start, hash_size); + tx_slave = tlb_choose_channel(bond, hash_index, skb->len); + } else { + /* + * do_tx_balance means we are free to select the tx_slave + * So we do exactly what tlb would do for hash selection + */ + + struct bond_up_slave *slaves; + unsigned int count; + + slaves = rcu_dereference(bond->usable_slaves); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (likely(count)) + tx_slave = slaves->arr[bond_xmit_hash(bond, skb) % + count]; + } + } + return tx_slave; +} + +netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *tx_slave = NULL; + + tx_slave = bond_xmit_alb_slave_get(bond, skb); + return bond_do_alb_xmit(skb, bond, tx_slave); +} + +void bond_alb_monitor(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + alb_work.work); + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct list_head *iter; + struct slave *slave; + + if (!bond_has_slaves(bond)) { + atomic_set(&bond_info->tx_rebalance_counter, 0); + bond_info->lp_counter = 0; + goto re_arm; + } + + rcu_read_lock(); + + atomic_inc(&bond_info->tx_rebalance_counter); + bond_info->lp_counter++; + + /* send learning packets */ + if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { + bool strict_match; + + bond_for_each_slave_rcu(bond, slave, iter) { + /* If updating current_active, use all currently + * user mac addreses (!strict_match). Otherwise, only + * use mac of the slave device. + * In RLB mode, we always use strict matches. + */ + strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || + bond_info->rlb_enabled); + alb_send_learning_packets(slave, slave->dev->dev_addr, + strict_match); + } + bond_info->lp_counter = 0; + } + + /* rebalance tx traffic */ + if (atomic_read(&bond_info->tx_rebalance_counter) >= BOND_TLB_REBALANCE_TICKS) { + bond_for_each_slave_rcu(bond, slave, iter) { + tlb_clear_slave(bond, slave, 1); + if (slave == rcu_access_pointer(bond->curr_active_slave)) { + SLAVE_TLB_INFO(slave).load = + bond_info->unbalanced_load / + BOND_TLB_REBALANCE_INTERVAL; + bond_info->unbalanced_load = 0; + } + } + atomic_set(&bond_info->tx_rebalance_counter, 0); + } + + if (bond_info->rlb_enabled) { + if (bond_info->primary_is_promisc && + (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { + + /* dev_set_promiscuity requires rtnl and + * nothing else. Avoid race with bond_close. + */ + rcu_read_unlock(); + if (!rtnl_trylock()) + goto re_arm; + + bond_info->rlb_promisc_timeout_counter = 0; + + /* If the primary was set to promiscuous mode + * because a slave was disabled then + * it can now leave promiscuous mode. + */ + dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, + -1); + bond_info->primary_is_promisc = 0; + + rtnl_unlock(); + rcu_read_lock(); + } + + if (bond_info->rlb_rebalance) { + bond_info->rlb_rebalance = 0; + rlb_rebalance(bond); + } + + /* check if clients need updating */ + if (bond_info->rx_ntt) { + if (bond_info->rlb_update_delay_counter) { + --bond_info->rlb_update_delay_counter; + } else { + rlb_update_rx_clients(bond); + if (bond_info->rlb_update_retry_counter) + --bond_info->rlb_update_retry_counter; + else + bond_info->rx_ntt = 0; + } + } + } + rcu_read_unlock(); +re_arm: + queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); +} + +/* assumption: called before the slave is attached to the bond + * and not locked by the bond lock + */ +int bond_alb_init_slave(struct bonding *bond, struct slave *slave) +{ + int res; + + res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, + slave->dev->addr_len); + if (res) + return res; + + res = alb_handle_addr_collision_on_attach(bond, slave); + if (res) + return res; + + tlb_init_slave(slave); + + /* order a rebalance ASAP */ + atomic_set(&bond->alb_info.tx_rebalance_counter, + BOND_TLB_REBALANCE_TICKS); + + if (bond->alb_info.rlb_enabled) + bond->alb_info.rlb_rebalance = 1; + + return 0; +} + +/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses + * if necessary. + * + * Caller must hold RTNL and no other locks + */ +void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) +{ + if (bond_has_slaves(bond)) + alb_change_hw_addr_on_detach(bond, slave); + + tlb_clear_slave(bond, slave, 0); + + if (bond->alb_info.rlb_enabled) { + bond->alb_info.rx_slave = NULL; + rlb_clear_slave(bond, slave); + } + +} + +void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) +{ + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + + if (link == BOND_LINK_DOWN) { + tlb_clear_slave(bond, slave, 0); + if (bond->alb_info.rlb_enabled) + rlb_clear_slave(bond, slave); + } else if (link == BOND_LINK_UP) { + /* order a rebalance ASAP */ + atomic_set(&bond_info->tx_rebalance_counter, + BOND_TLB_REBALANCE_TICKS); + if (bond->alb_info.rlb_enabled) { + bond->alb_info.rlb_rebalance = 1; + /* If the updelay module parameter is smaller than the + * forwarding delay of the switch the rebalance will + * not work because the rebalance arp replies will + * not be forwarded to the clients.. + */ + } + } + + if (bond_is_nondyn_tlb(bond)) { + if (bond_update_slave_arr(bond, NULL)) + pr_err("Failed to build slave-array for TLB mode.\n"); + } +} + +/** + * bond_alb_handle_active_change - assign new curr_active_slave + * @bond: our bonding struct + * @new_slave: new slave to assign + * + * Set the bond->curr_active_slave to @new_slave and handle + * mac address swapping and promiscuity changes as needed. + * + * Caller must hold RTNL + */ +void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) +{ + struct slave *swap_slave; + struct slave *curr_active; + + curr_active = rtnl_dereference(bond->curr_active_slave); + if (curr_active == new_slave) + return; + + if (curr_active && bond->alb_info.primary_is_promisc) { + dev_set_promiscuity(curr_active->dev, -1); + bond->alb_info.primary_is_promisc = 0; + bond->alb_info.rlb_promisc_timeout_counter = 0; + } + + swap_slave = curr_active; + rcu_assign_pointer(bond->curr_active_slave, new_slave); + + if (!new_slave || !bond_has_slaves(bond)) + return; + + /* set the new curr_active_slave to the bonds mac address + * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave + */ + if (!swap_slave) + swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); + + /* Arrange for swap_slave and new_slave to temporarily be + * ignored so we can mess with their MAC addresses without + * fear of interference from transmit activity. + */ + if (swap_slave) + tlb_clear_slave(bond, swap_slave, 1); + tlb_clear_slave(bond, new_slave, 1); + + /* in TLB mode, the slave might flip down/up with the old dev_addr, + * and thus filter bond->dev_addr's packets, so force bond's mac + */ + if (BOND_MODE(bond) == BOND_MODE_TLB) { + struct sockaddr_storage ss; + u8 tmp_addr[MAX_ADDR_LEN]; + + bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr, + new_slave->dev->addr_len); + + bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, + bond->dev->addr_len); + ss.ss_family = bond->dev->type; + /* we don't care if it can't change its mac, best effort */ + dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss, + NULL); + + bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr, + new_slave->dev->addr_len); + } + + /* curr_active_slave must be set before calling alb_swap_mac_addr */ + if (swap_slave) { + /* swap mac address */ + alb_swap_mac_addr(swap_slave, new_slave); + alb_fasten_mac_swap(bond, swap_slave, new_slave); + } else { + /* set the new_slave to the bond mac address */ + alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, + bond->dev->addr_len); + alb_send_learning_packets(new_slave, bond->dev->dev_addr, + false); + } +} + +/* Called with RTNL */ +int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct sockaddr_storage *ss = addr; + struct slave *curr_active; + struct slave *swap_slave; + int res; + + if (!is_valid_ether_addr(ss->__data)) + return -EADDRNOTAVAIL; + + res = alb_set_mac_address(bond, addr); + if (res) + return res; + + bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); + + /* If there is no curr_active_slave there is nothing else to do. + * Otherwise we'll need to pass the new address to it and handle + * duplications. + */ + curr_active = rtnl_dereference(bond->curr_active_slave); + if (!curr_active) + return 0; + + swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); + + if (swap_slave) { + alb_swap_mac_addr(swap_slave, curr_active); + alb_fasten_mac_swap(bond, swap_slave, curr_active); + } else { + alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr, + bond_dev->addr_len); + + alb_send_learning_packets(curr_active, + bond_dev->dev_addr, false); + if (bond->alb_info.rlb_enabled) { + /* inform clients mac address has changed */ + rlb_req_update_slave_clients(bond, curr_active); + } + } + + return 0; +} + +void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) +{ + if (bond->alb_info.rlb_enabled) + rlb_clear_vlan(bond, vlan_id); +} + diff --git a/drivers/net/bonding/bond_debugfs.c b/drivers/net/bonding/bond_debugfs.c new file mode 100644 index 000000000..8b6cf2bf9 --- /dev/null +++ b/drivers/net/bonding/bond_debugfs.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/netdevice.h> + +#include <net/bonding.h> +#include <net/bond_alb.h> + +#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_NET_NS) + +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +static struct dentry *bonding_debug_root; + +/* Show RLB hash table */ +static int bond_debug_rlb_hash_show(struct seq_file *m, void *v) +{ + struct bonding *bond = m->private; + struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); + struct rlb_client_info *client_info; + u32 hash_index; + + if (BOND_MODE(bond) != BOND_MODE_ALB) + return 0; + + seq_printf(m, "SourceIP DestinationIP " + "Destination MAC DEV\n"); + + spin_lock_bh(&bond->mode_lock); + + hash_index = bond_info->rx_hashtbl_used_head; + for (; hash_index != RLB_NULL_INDEX; + hash_index = client_info->used_next) { + client_info = &(bond_info->rx_hashtbl[hash_index]); + seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n", + &client_info->ip_src, + &client_info->ip_dst, + &client_info->mac_dst, + client_info->slave->dev->name); + } + + spin_unlock_bh(&bond->mode_lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(bond_debug_rlb_hash); + +void bond_debug_register(struct bonding *bond) +{ + if (!bonding_debug_root) + return; + + bond->debug_dir = + debugfs_create_dir(bond->dev->name, bonding_debug_root); + + debugfs_create_file("rlb_hash_table", 0400, bond->debug_dir, + bond, &bond_debug_rlb_hash_fops); +} + +void bond_debug_unregister(struct bonding *bond) +{ + if (!bonding_debug_root) + return; + + debugfs_remove_recursive(bond->debug_dir); +} + +void bond_debug_reregister(struct bonding *bond) +{ + struct dentry *d; + + if (!bonding_debug_root) + return; + + d = debugfs_rename(bonding_debug_root, bond->debug_dir, + bonding_debug_root, bond->dev->name); + if (!IS_ERR(d)) { + bond->debug_dir = d; + } else { + netdev_warn(bond->dev, "failed to reregister, so just unregister old one\n"); + bond_debug_unregister(bond); + } +} + +void bond_create_debugfs(void) +{ + bonding_debug_root = debugfs_create_dir("bonding", NULL); + + if (!bonding_debug_root) { + pr_warn("Warning: Cannot create bonding directory in debugfs\n"); + } +} + +void bond_destroy_debugfs(void) +{ + debugfs_remove_recursive(bonding_debug_root); + bonding_debug_root = NULL; +} + + +#else /* !CONFIG_DEBUG_FS */ + +void bond_debug_register(struct bonding *bond) +{ +} + +void bond_debug_unregister(struct bonding *bond) +{ +} + +void bond_debug_reregister(struct bonding *bond) +{ +} + +void bond_create_debugfs(void) +{ +} + +void bond_destroy_debugfs(void) +{ +} + +#endif /* CONFIG_DEBUG_FS */ diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c new file mode 100644 index 000000000..50fabba04 --- /dev/null +++ b/drivers/net/bonding/bond_main.c @@ -0,0 +1,5552 @@ +/* + * originally based on the dummy device. + * + * Copyright 1999, Thomas Davis, tadavis@lbl.gov. + * Licensed under the GPL. Based on dummy.c, and eql.c devices. + * + * bonding.c: an Ethernet Bonding driver + * + * This is useful to talk to a Cisco EtherChannel compatible equipment: + * Cisco 5500 + * Sun Trunking (Solaris) + * Alteon AceDirector Trunks + * Linux Bonding + * and probably many L2 switches ... + * + * How it works: + * ifconfig bond0 ipaddress netmask up + * will setup a network device, with an ip address. No mac address + * will be assigned at this time. The hw mac address will come from + * the first slave bonded to the channel. All slaves will then use + * this hw mac address. + * + * ifconfig bond0 down + * will release all slaves, marking them as down. + * + * ifenslave bond0 eth0 + * will attach eth0 to bond0 as a slave. eth0 hw mac address will either + * a: be used as initial mac address + * b: if a hw mac address already is there, eth0's hw mac address + * will then be set from bond0. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <net/ip.h> +#include <linux/ip.h> +#include <linux/icmp.h> +#include <linux/icmpv6.h> +#include <linux/tcp.h> +#include <linux/udp.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/timer.h> +#include <linux/socket.h> +#include <linux/ctype.h> +#include <linux/inet.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <asm/dma.h> +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/igmp.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/rtnetlink.h> +#include <linux/smp.h> +#include <linux/if_ether.h> +#include <net/arp.h> +#include <linux/mii.h> +#include <linux/ethtool.h> +#include <linux/if_vlan.h> +#include <linux/if_bonding.h> +#include <linux/jiffies.h> +#include <linux/preempt.h> +#include <net/route.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/pkt_sched.h> +#include <linux/rculist.h> +#include <net/flow_dissector.h> +#include <net/xfrm.h> +#include <net/bonding.h> +#include <net/bond_3ad.h> +#include <net/bond_alb.h> + +#include "bonding_priv.h" + +/*---------------------------- Module parameters ----------------------------*/ + +/* monitor all links that often (in milliseconds). <=0 disables monitoring */ + +static int max_bonds = BOND_DEFAULT_MAX_BONDS; +static int tx_queues = BOND_DEFAULT_TX_QUEUES; +static int num_peer_notif = 1; +static int miimon; +static int updelay; +static int downdelay; +static int use_carrier = 1; +static char *mode; +static char *primary; +static char *primary_reselect; +static char *lacp_rate; +static int min_links; +static char *ad_select; +static char *xmit_hash_policy; +static int arp_interval; +static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; +static char *arp_validate; +static char *arp_all_targets; +static char *fail_over_mac; +static int all_slaves_active; +static struct bond_params bonding_defaults; +static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; +static int packets_per_slave = 1; +static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; + +module_param(max_bonds, int, 0); +MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); +module_param(tx_queues, int, 0); +MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); +module_param_named(num_grat_arp, num_peer_notif, int, 0644); +MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " + "failover event (alias of num_unsol_na)"); +module_param_named(num_unsol_na, num_peer_notif, int, 0644); +MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " + "failover event (alias of num_grat_arp)"); +module_param(miimon, int, 0); +MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); +module_param(updelay, int, 0); +MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); +module_param(downdelay, int, 0); +MODULE_PARM_DESC(downdelay, "Delay before considering link down, " + "in milliseconds"); +module_param(use_carrier, int, 0); +MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " + "0 for off, 1 for on (default)"); +module_param(mode, charp, 0); +MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " + "1 for active-backup, 2 for balance-xor, " + "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " + "6 for balance-alb"); +module_param(primary, charp, 0); +MODULE_PARM_DESC(primary, "Primary network device to use"); +module_param(primary_reselect, charp, 0); +MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " + "once it comes up; " + "0 for always (default), " + "1 for only if speed of primary is " + "better, " + "2 for only on active slave " + "failure"); +module_param(lacp_rate, charp, 0); +MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " + "0 for slow, 1 for fast"); +module_param(ad_select, charp, 0); +MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " + "0 for stable (default), 1 for bandwidth, " + "2 for count"); +module_param(min_links, int, 0); +MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); + +module_param(xmit_hash_policy, charp, 0); +MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " + "0 for layer 2 (default), 1 for layer 3+4, " + "2 for layer 2+3, 3 for encap layer 2+3, " + "4 for encap layer 3+4"); +module_param(arp_interval, int, 0); +MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); +module_param_array(arp_ip_target, charp, NULL, 0); +MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); +module_param(arp_validate, charp, 0); +MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " + "0 for none (default), 1 for active, " + "2 for backup, 3 for all"); +module_param(arp_all_targets, charp, 0); +MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); +module_param(fail_over_mac, charp, 0); +MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " + "the same MAC; 0 for none (default), " + "1 for active, 2 for follow"); +module_param(all_slaves_active, int, 0); +MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " + "by setting active flag for all slaves; " + "0 for never (default), 1 for always."); +module_param(resend_igmp, int, 0); +MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " + "link failure"); +module_param(packets_per_slave, int, 0); +MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " + "mode; 0 for a random slave, 1 packet per " + "slave (default), >1 packets per slave."); +module_param(lp_interval, uint, 0); +MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " + "the bonding driver sends learning packets to " + "each slaves peer switch. The default is 1."); + +/*----------------------------- Global variables ----------------------------*/ + +#ifdef CONFIG_NET_POLL_CONTROLLER +atomic_t netpoll_block_tx = ATOMIC_INIT(0); +#endif + +unsigned int bond_net_id __read_mostly; + +static const struct flow_dissector_key flow_keys_bonding_keys[] = { + { + .key_id = FLOW_DISSECTOR_KEY_CONTROL, + .offset = offsetof(struct flow_keys, control), + }, + { + .key_id = FLOW_DISSECTOR_KEY_BASIC, + .offset = offsetof(struct flow_keys, basic), + }, + { + .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, + .offset = offsetof(struct flow_keys, addrs.v4addrs), + }, + { + .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, + .offset = offsetof(struct flow_keys, addrs.v6addrs), + }, + { + .key_id = FLOW_DISSECTOR_KEY_TIPC, + .offset = offsetof(struct flow_keys, addrs.tipckey), + }, + { + .key_id = FLOW_DISSECTOR_KEY_PORTS, + .offset = offsetof(struct flow_keys, ports), + }, + { + .key_id = FLOW_DISSECTOR_KEY_ICMP, + .offset = offsetof(struct flow_keys, icmp), + }, + { + .key_id = FLOW_DISSECTOR_KEY_VLAN, + .offset = offsetof(struct flow_keys, vlan), + }, + { + .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, + .offset = offsetof(struct flow_keys, tags), + }, + { + .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, + .offset = offsetof(struct flow_keys, keyid), + }, +}; + +static struct flow_dissector flow_keys_bonding __read_mostly; + +/*-------------------------- Forward declarations ---------------------------*/ + +static int bond_init(struct net_device *bond_dev); +static void bond_uninit(struct net_device *bond_dev); +static void bond_get_stats(struct net_device *bond_dev, + struct rtnl_link_stats64 *stats); +static void bond_slave_arr_handler(struct work_struct *work); +static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, + int mod); +static void bond_netdev_notify_work(struct work_struct *work); + +/*---------------------------- General routines -----------------------------*/ + +const char *bond_mode_name(int mode) +{ + static const char *names[] = { + [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", + [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", + [BOND_MODE_XOR] = "load balancing (xor)", + [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", + [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", + [BOND_MODE_TLB] = "transmit load balancing", + [BOND_MODE_ALB] = "adaptive load balancing", + }; + + if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) + return "unknown"; + + return names[mode]; +} + +/** + * bond_dev_queue_xmit - Prepare skb for xmit. + * + * @bond: bond device that got this skb for tx. + * @skb: hw accel VLAN tagged skb to transmit + * @slave_dev: slave that is supposed to xmit this skbuff + */ +netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, + struct net_device *slave_dev) +{ + skb->dev = slave_dev; + + BUILD_BUG_ON(sizeof(skb->queue_mapping) != + sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); + skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); + + if (unlikely(netpoll_tx_running(bond->dev))) + return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); + + return dev_queue_xmit(skb); +} + +/*---------------------------------- VLAN -----------------------------------*/ + +/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, + * We don't protect the slave list iteration with a lock because: + * a. This operation is performed in IOCTL context, + * b. The operation is protected by the RTNL semaphore in the 8021q code, + * c. Holding a lock with BH disabled while directly calling a base driver + * entry point is generally a BAD idea. + * + * The design of synchronization/protection for this operation in the 8021q + * module is good for one or more VLAN devices over a single physical device + * and cannot be extended for a teaming solution like bonding, so there is a + * potential race condition here where a net device from the vlan group might + * be referenced (either by a base driver or the 8021q code) while it is being + * removed from the system. However, it turns out we're not making matters + * worse, and if it works for regular VLAN usage it will work here too. +*/ + +/** + * bond_vlan_rx_add_vid - Propagates adding an id to slaves + * @bond_dev: bonding net device that got called + * @proto: network protocol ID + * @vid: vlan id being added + */ +static int bond_vlan_rx_add_vid(struct net_device *bond_dev, + __be16 proto, u16 vid) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *rollback_slave; + struct list_head *iter; + int res; + + bond_for_each_slave(bond, slave, iter) { + res = vlan_vid_add(slave->dev, proto, vid); + if (res) + goto unwind; + } + + return 0; + +unwind: + /* unwind to the slave that failed */ + bond_for_each_slave(bond, rollback_slave, iter) { + if (rollback_slave == slave) + break; + + vlan_vid_del(rollback_slave->dev, proto, vid); + } + + return res; +} + +/** + * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves + * @bond_dev: bonding net device that got called + * @proto: network protocol ID + * @vid: vlan id being removed + */ +static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, + __be16 proto, u16 vid) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) + vlan_vid_del(slave->dev, proto, vid); + + if (bond_is_lb(bond)) + bond_alb_clear_vlan(bond, vid); + + return 0; +} + +/*---------------------------------- XFRM -----------------------------------*/ + +#ifdef CONFIG_XFRM_OFFLOAD +/** + * bond_ipsec_add_sa - program device with a security association + * @xs: pointer to transformer state struct + **/ +static int bond_ipsec_add_sa(struct xfrm_state *xs) +{ + struct net_device *bond_dev = xs->xso.dev; + struct bond_ipsec *ipsec; + struct bonding *bond; + struct slave *slave; + int err; + + if (!bond_dev) + return -EINVAL; + + rcu_read_lock(); + bond = netdev_priv(bond_dev); + slave = rcu_dereference(bond->curr_active_slave); + if (!slave) { + rcu_read_unlock(); + return -ENODEV; + } + + if (!slave->dev->xfrmdev_ops || + !slave->dev->xfrmdev_ops->xdo_dev_state_add || + netif_is_bond_master(slave->dev)) { + slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n"); + rcu_read_unlock(); + return -EINVAL; + } + + ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); + if (!ipsec) { + rcu_read_unlock(); + return -ENOMEM; + } + xs->xso.real_dev = slave->dev; + + err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs); + if (!err) { + ipsec->xs = xs; + INIT_LIST_HEAD(&ipsec->list); + spin_lock_bh(&bond->ipsec_lock); + list_add(&ipsec->list, &bond->ipsec_list); + spin_unlock_bh(&bond->ipsec_lock); + } else { + kfree(ipsec); + } + rcu_read_unlock(); + return err; +} + +static void bond_ipsec_add_sa_all(struct bonding *bond) +{ + struct net_device *bond_dev = bond->dev; + struct bond_ipsec *ipsec; + struct slave *slave; + + rcu_read_lock(); + slave = rcu_dereference(bond->curr_active_slave); + if (!slave) + goto out; + + if (!slave->dev->xfrmdev_ops || + !slave->dev->xfrmdev_ops->xdo_dev_state_add || + netif_is_bond_master(slave->dev)) { + spin_lock_bh(&bond->ipsec_lock); + if (!list_empty(&bond->ipsec_list)) + slave_warn(bond_dev, slave->dev, + "%s: no slave xdo_dev_state_add\n", + __func__); + spin_unlock_bh(&bond->ipsec_lock); + goto out; + } + + spin_lock_bh(&bond->ipsec_lock); + list_for_each_entry(ipsec, &bond->ipsec_list, list) { + ipsec->xs->xso.real_dev = slave->dev; + if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) { + slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); + ipsec->xs->xso.real_dev = NULL; + } + } + spin_unlock_bh(&bond->ipsec_lock); +out: + rcu_read_unlock(); +} + +/** + * bond_ipsec_del_sa - clear out this specific SA + * @xs: pointer to transformer state struct + **/ +static void bond_ipsec_del_sa(struct xfrm_state *xs) +{ + struct net_device *bond_dev = xs->xso.dev; + struct bond_ipsec *ipsec; + struct bonding *bond; + struct slave *slave; + + if (!bond_dev) + return; + + rcu_read_lock(); + bond = netdev_priv(bond_dev); + slave = rcu_dereference(bond->curr_active_slave); + + if (!slave) + goto out; + + if (!xs->xso.real_dev) + goto out; + + WARN_ON(xs->xso.real_dev != slave->dev); + + if (!slave->dev->xfrmdev_ops || + !slave->dev->xfrmdev_ops->xdo_dev_state_delete || + netif_is_bond_master(slave->dev)) { + slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); + goto out; + } + + slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); +out: + spin_lock_bh(&bond->ipsec_lock); + list_for_each_entry(ipsec, &bond->ipsec_list, list) { + if (ipsec->xs == xs) { + list_del(&ipsec->list); + kfree(ipsec); + break; + } + } + spin_unlock_bh(&bond->ipsec_lock); + rcu_read_unlock(); +} + +static void bond_ipsec_del_sa_all(struct bonding *bond) +{ + struct net_device *bond_dev = bond->dev; + struct bond_ipsec *ipsec; + struct slave *slave; + + rcu_read_lock(); + slave = rcu_dereference(bond->curr_active_slave); + if (!slave) { + rcu_read_unlock(); + return; + } + + spin_lock_bh(&bond->ipsec_lock); + list_for_each_entry(ipsec, &bond->ipsec_list, list) { + if (!ipsec->xs->xso.real_dev) + continue; + + if (!slave->dev->xfrmdev_ops || + !slave->dev->xfrmdev_ops->xdo_dev_state_delete || + netif_is_bond_master(slave->dev)) { + slave_warn(bond_dev, slave->dev, + "%s: no slave xdo_dev_state_delete\n", + __func__); + } else { + slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); + } + ipsec->xs->xso.real_dev = NULL; + } + spin_unlock_bh(&bond->ipsec_lock); + rcu_read_unlock(); +} + +/** + * bond_ipsec_offload_ok - can this packet use the xfrm hw offload + * @skb: current data packet + * @xs: pointer to transformer state struct + **/ +static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) +{ + struct net_device *bond_dev = xs->xso.dev; + struct net_device *real_dev; + struct slave *curr_active; + struct bonding *bond; + int err; + + bond = netdev_priv(bond_dev); + rcu_read_lock(); + curr_active = rcu_dereference(bond->curr_active_slave); + real_dev = curr_active->dev; + + if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + err = false; + goto out; + } + + if (!xs->xso.real_dev) { + err = false; + goto out; + } + + if (!real_dev->xfrmdev_ops || + !real_dev->xfrmdev_ops->xdo_dev_offload_ok || + netif_is_bond_master(real_dev)) { + err = false; + goto out; + } + + err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); +out: + rcu_read_unlock(); + return err; +} + +static const struct xfrmdev_ops bond_xfrmdev_ops = { + .xdo_dev_state_add = bond_ipsec_add_sa, + .xdo_dev_state_delete = bond_ipsec_del_sa, + .xdo_dev_offload_ok = bond_ipsec_offload_ok, +}; +#endif /* CONFIG_XFRM_OFFLOAD */ + +/*------------------------------- Link status -------------------------------*/ + +/* Set the carrier state for the master according to the state of its + * slaves. If any slaves are up, the master is up. In 802.3ad mode, + * do special 802.3ad magic. + * + * Returns zero if carrier state does not change, nonzero if it does. + */ +int bond_set_carrier(struct bonding *bond) +{ + struct list_head *iter; + struct slave *slave; + + if (!bond_has_slaves(bond)) + goto down; + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + return bond_3ad_set_carrier(bond); + + bond_for_each_slave(bond, slave, iter) { + if (slave->link == BOND_LINK_UP) { + if (!netif_carrier_ok(bond->dev)) { + netif_carrier_on(bond->dev); + return 1; + } + return 0; + } + } + +down: + if (netif_carrier_ok(bond->dev)) { + netif_carrier_off(bond->dev); + return 1; + } + return 0; +} + +/* Get link speed and duplex from the slave's base driver + * using ethtool. If for some reason the call fails or the + * values are invalid, set speed and duplex to -1, + * and return. Return 1 if speed or duplex settings are + * UNKNOWN; 0 otherwise. + */ +static int bond_update_speed_duplex(struct slave *slave) +{ + struct net_device *slave_dev = slave->dev; + struct ethtool_link_ksettings ecmd; + int res; + + slave->speed = SPEED_UNKNOWN; + slave->duplex = DUPLEX_UNKNOWN; + + res = __ethtool_get_link_ksettings(slave_dev, &ecmd); + if (res < 0) + return 1; + if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) + return 1; + switch (ecmd.base.duplex) { + case DUPLEX_FULL: + case DUPLEX_HALF: + break; + default: + return 1; + } + + slave->speed = ecmd.base.speed; + slave->duplex = ecmd.base.duplex; + + return 0; +} + +const char *bond_slave_link_status(s8 link) +{ + switch (link) { + case BOND_LINK_UP: + return "up"; + case BOND_LINK_FAIL: + return "going down"; + case BOND_LINK_DOWN: + return "down"; + case BOND_LINK_BACK: + return "going back"; + default: + return "unknown"; + } +} + +/* if <dev> supports MII link status reporting, check its link status. + * + * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), + * depending upon the setting of the use_carrier parameter. + * + * Return either BMSR_LSTATUS, meaning that the link is up (or we + * can't tell and just pretend it is), or 0, meaning that the link is + * down. + * + * If reporting is non-zero, instead of faking link up, return -1 if + * both ETHTOOL and MII ioctls fail (meaning the device does not + * support them). If use_carrier is set, return whatever it says. + * It'd be nice if there was a good way to tell if a driver supports + * netif_carrier, but there really isn't. + */ +static int bond_check_dev_link(struct bonding *bond, + struct net_device *slave_dev, int reporting) +{ + const struct net_device_ops *slave_ops = slave_dev->netdev_ops; + int (*ioctl)(struct net_device *, struct ifreq *, int); + struct ifreq ifr; + struct mii_ioctl_data *mii; + + if (!reporting && !netif_running(slave_dev)) + return 0; + + if (bond->params.use_carrier) + return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; + + /* Try to get link status using Ethtool first. */ + if (slave_dev->ethtool_ops->get_link) + return slave_dev->ethtool_ops->get_link(slave_dev) ? + BMSR_LSTATUS : 0; + + /* Ethtool can't be used, fallback to MII ioctls. */ + ioctl = slave_ops->ndo_do_ioctl; + if (ioctl) { + /* TODO: set pointer to correct ioctl on a per team member + * bases to make this more efficient. that is, once + * we determine the correct ioctl, we will always + * call it and not the others for that team + * member. + */ + + /* We cannot assume that SIOCGMIIPHY will also read a + * register; not all network drivers (e.g., e100) + * support that. + */ + + /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ + strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); + mii = if_mii(&ifr); + if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { + mii->reg_num = MII_BMSR; + if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) + return mii->val_out & BMSR_LSTATUS; + } + } + + /* If reporting, report that either there's no dev->do_ioctl, + * or both SIOCGMIIREG and get_link failed (meaning that we + * cannot report link status). If not reporting, pretend + * we're ok. + */ + return reporting ? -1 : BMSR_LSTATUS; +} + +/*----------------------------- Multicast list ------------------------------*/ + +/* Push the promiscuity flag down to appropriate slaves */ +static int bond_set_promiscuity(struct bonding *bond, int inc) +{ + struct list_head *iter; + int err = 0; + + if (bond_uses_primary(bond)) { + struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); + + if (curr_active) + err = dev_set_promiscuity(curr_active->dev, inc); + } else { + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) { + err = dev_set_promiscuity(slave->dev, inc); + if (err) + return err; + } + } + return err; +} + +/* Push the allmulti flag down to all slaves */ +static int bond_set_allmulti(struct bonding *bond, int inc) +{ + struct list_head *iter; + int err = 0; + + if (bond_uses_primary(bond)) { + struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); + + if (curr_active) + err = dev_set_allmulti(curr_active->dev, inc); + } else { + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) { + err = dev_set_allmulti(slave->dev, inc); + if (err) + return err; + } + } + return err; +} + +/* Retrieve the list of registered multicast addresses for the bonding + * device and retransmit an IGMP JOIN request to the current active + * slave. + */ +static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + mcast_work.work); + + if (!rtnl_trylock()) { + queue_delayed_work(bond->wq, &bond->mcast_work, 1); + return; + } + call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); + + if (bond->igmp_retrans > 1) { + bond->igmp_retrans--; + queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); + } + rtnl_unlock(); +} + +/* Flush bond's hardware addresses from slave */ +static void bond_hw_addr_flush(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + + dev_uc_unsync(slave_dev, bond_dev); + dev_mc_unsync(slave_dev, bond_dev); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + dev_mc_del(slave_dev, lacpdu_mcast_addr); +} + +/*--------------------------- Active slave change ---------------------------*/ + +/* Update the hardware address list and promisc/allmulti for the new and + * old active slaves (if any). Modes that are not using primary keep all + * slaves up date at all times; only the modes that use primary need to call + * this function to swap these settings during a failover. + */ +static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, + struct slave *old_active) +{ + if (old_active) { + if (bond->dev->flags & IFF_PROMISC) + dev_set_promiscuity(old_active->dev, -1); + + if (bond->dev->flags & IFF_ALLMULTI) + dev_set_allmulti(old_active->dev, -1); + + if (bond->dev->flags & IFF_UP) + bond_hw_addr_flush(bond->dev, old_active->dev); + } + + if (new_active) { + /* FIXME: Signal errors upstream. */ + if (bond->dev->flags & IFF_PROMISC) + dev_set_promiscuity(new_active->dev, 1); + + if (bond->dev->flags & IFF_ALLMULTI) + dev_set_allmulti(new_active->dev, 1); + + if (bond->dev->flags & IFF_UP) { + netif_addr_lock_bh(bond->dev); + dev_uc_sync(new_active->dev, bond->dev); + dev_mc_sync(new_active->dev, bond->dev); + netif_addr_unlock_bh(bond->dev); + } + } +} + +/** + * bond_set_dev_addr - clone slave's address to bond + * @bond_dev: bond net device + * @slave_dev: slave net device + * + * Should be called with RTNL held. + */ +static int bond_set_dev_addr(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + int err; + + slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", + bond_dev, slave_dev, slave_dev->addr_len); + err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); + if (err) + return err; + + memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); + bond_dev->addr_assign_type = NET_ADDR_STOLEN; + call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); + return 0; +} + +static struct slave *bond_get_old_active(struct bonding *bond, + struct slave *new_active) +{ + struct slave *slave; + struct list_head *iter; + + bond_for_each_slave(bond, slave, iter) { + if (slave == new_active) + continue; + + if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) + return slave; + } + + return NULL; +} + +/* bond_do_fail_over_mac + * + * Perform special MAC address swapping for fail_over_mac settings + * + * Called with RTNL + */ +static void bond_do_fail_over_mac(struct bonding *bond, + struct slave *new_active, + struct slave *old_active) +{ + u8 tmp_mac[MAX_ADDR_LEN]; + struct sockaddr_storage ss; + int rv; + + switch (bond->params.fail_over_mac) { + case BOND_FOM_ACTIVE: + if (new_active) { + rv = bond_set_dev_addr(bond->dev, new_active->dev); + if (rv) + slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", + -rv); + } + break; + case BOND_FOM_FOLLOW: + /* if new_active && old_active, swap them + * if just old_active, do nothing (going to no active slave) + * if just new_active, set new_active to bond's MAC + */ + if (!new_active) + return; + + if (!old_active) + old_active = bond_get_old_active(bond, new_active); + + if (old_active) { + bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, + new_active->dev->addr_len); + bond_hw_addr_copy(ss.__data, + old_active->dev->dev_addr, + old_active->dev->addr_len); + ss.ss_family = new_active->dev->type; + } else { + bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, + bond->dev->addr_len); + ss.ss_family = bond->dev->type; + } + + rv = dev_set_mac_address(new_active->dev, + (struct sockaddr *)&ss, NULL); + if (rv) { + slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", + -rv); + goto out; + } + + if (!old_active) + goto out; + + bond_hw_addr_copy(ss.__data, tmp_mac, + new_active->dev->addr_len); + ss.ss_family = old_active->dev->type; + + rv = dev_set_mac_address(old_active->dev, + (struct sockaddr *)&ss, NULL); + if (rv) + slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", + -rv); +out: + break; + default: + netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", + bond->params.fail_over_mac); + break; + } + +} + +static struct slave *bond_choose_primary_or_current(struct bonding *bond) +{ + struct slave *prim = rtnl_dereference(bond->primary_slave); + struct slave *curr = rtnl_dereference(bond->curr_active_slave); + + if (!prim || prim->link != BOND_LINK_UP) { + if (!curr || curr->link != BOND_LINK_UP) + return NULL; + return curr; + } + + if (bond->force_primary) { + bond->force_primary = false; + return prim; + } + + if (!curr || curr->link != BOND_LINK_UP) + return prim; + + /* At this point, prim and curr are both up */ + switch (bond->params.primary_reselect) { + case BOND_PRI_RESELECT_ALWAYS: + return prim; + case BOND_PRI_RESELECT_BETTER: + if (prim->speed < curr->speed) + return curr; + if (prim->speed == curr->speed && prim->duplex <= curr->duplex) + return curr; + return prim; + case BOND_PRI_RESELECT_FAILURE: + return curr; + default: + netdev_err(bond->dev, "impossible primary_reselect %d\n", + bond->params.primary_reselect); + return curr; + } +} + +/** + * bond_find_best_slave - select the best available slave to be the active one + * @bond: our bonding struct + */ +static struct slave *bond_find_best_slave(struct bonding *bond) +{ + struct slave *slave, *bestslave = NULL; + struct list_head *iter; + int mintime = bond->params.updelay; + + slave = bond_choose_primary_or_current(bond); + if (slave) + return slave; + + bond_for_each_slave(bond, slave, iter) { + if (slave->link == BOND_LINK_UP) + return slave; + if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && + slave->delay < mintime) { + mintime = slave->delay; + bestslave = slave; + } + } + + return bestslave; +} + +static bool bond_should_notify_peers(struct bonding *bond) +{ + struct slave *slave; + + rcu_read_lock(); + slave = rcu_dereference(bond->curr_active_slave); + rcu_read_unlock(); + + if (!slave || !bond->send_peer_notif || + bond->send_peer_notif % + max(1, bond->params.peer_notif_delay) != 0 || + !netif_carrier_ok(bond->dev) || + test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) + return false; + + netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", + slave ? slave->dev->name : "NULL"); + + return true; +} + +/** + * change_active_interface - change the active slave into the specified one + * @bond: our bonding struct + * @new_active: the new slave to make the active one + * + * Set the new slave to the bond's settings and unset them on the old + * curr_active_slave. + * Setting include flags, mc-list, promiscuity, allmulti, etc. + * + * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, + * because it is apparently the best available slave we have, even though its + * updelay hasn't timed out yet. + * + * Caller must hold RTNL. + */ +void bond_change_active_slave(struct bonding *bond, struct slave *new_active) +{ + struct slave *old_active; + + ASSERT_RTNL(); + + old_active = rtnl_dereference(bond->curr_active_slave); + + if (old_active == new_active) + return; + +#ifdef CONFIG_XFRM_OFFLOAD + bond_ipsec_del_sa_all(bond); +#endif /* CONFIG_XFRM_OFFLOAD */ + + if (new_active) { + new_active->last_link_up = jiffies; + + if (new_active->link == BOND_LINK_BACK) { + if (bond_uses_primary(bond)) { + slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", + (bond->params.updelay - new_active->delay) * bond->params.miimon); + } + + new_active->delay = 0; + bond_set_slave_link_state(new_active, BOND_LINK_UP, + BOND_SLAVE_NOTIFY_NOW); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + bond_3ad_handle_link_change(new_active, BOND_LINK_UP); + + if (bond_is_lb(bond)) + bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); + } else { + if (bond_uses_primary(bond)) { + slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); + } + } + } + + if (bond_uses_primary(bond)) + bond_hw_addr_swap(bond, new_active, old_active); + + if (bond_is_lb(bond)) { + bond_alb_handle_active_change(bond, new_active); + if (old_active) + bond_set_slave_inactive_flags(old_active, + BOND_SLAVE_NOTIFY_NOW); + if (new_active) + bond_set_slave_active_flags(new_active, + BOND_SLAVE_NOTIFY_NOW); + } else { + rcu_assign_pointer(bond->curr_active_slave, new_active); + } + + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { + if (old_active) + bond_set_slave_inactive_flags(old_active, + BOND_SLAVE_NOTIFY_NOW); + + if (new_active) { + bool should_notify_peers = false; + + bond_set_slave_active_flags(new_active, + BOND_SLAVE_NOTIFY_NOW); + + if (bond->params.fail_over_mac) + bond_do_fail_over_mac(bond, new_active, + old_active); + + if (netif_running(bond->dev)) { + bond->send_peer_notif = + bond->params.num_peer_notif * + max(1, bond->params.peer_notif_delay); + should_notify_peers = + bond_should_notify_peers(bond); + } + + call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); + if (should_notify_peers) { + bond->send_peer_notif--; + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, + bond->dev); + } + } + } + +#ifdef CONFIG_XFRM_OFFLOAD + bond_ipsec_add_sa_all(bond); +#endif /* CONFIG_XFRM_OFFLOAD */ + + /* resend IGMP joins since active slave has changed or + * all were sent on curr_active_slave. + * resend only if bond is brought up with the affected + * bonding modes and the retransmission is enabled + */ + if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && + ((bond_uses_primary(bond) && new_active) || + BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { + bond->igmp_retrans = bond->params.resend_igmp; + queue_delayed_work(bond->wq, &bond->mcast_work, 1); + } +} + +/** + * bond_select_active_slave - select a new active slave, if needed + * @bond: our bonding struct + * + * This functions should be called when one of the following occurs: + * - The old curr_active_slave has been released or lost its link. + * - The primary_slave has got its link back. + * - A slave has got its link back and there's no old curr_active_slave. + * + * Caller must hold RTNL. + */ +void bond_select_active_slave(struct bonding *bond) +{ + struct slave *best_slave; + int rv; + + ASSERT_RTNL(); + + best_slave = bond_find_best_slave(bond); + if (best_slave != rtnl_dereference(bond->curr_active_slave)) { + bond_change_active_slave(bond, best_slave); + rv = bond_set_carrier(bond); + if (!rv) + return; + + if (netif_carrier_ok(bond->dev)) + netdev_info(bond->dev, "active interface up!\n"); + else + netdev_info(bond->dev, "now running without any active interface!\n"); + } +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +static inline int slave_enable_netpoll(struct slave *slave) +{ + struct netpoll *np; + int err = 0; + + np = kzalloc(sizeof(*np), GFP_KERNEL); + err = -ENOMEM; + if (!np) + goto out; + + err = __netpoll_setup(np, slave->dev); + if (err) { + kfree(np); + goto out; + } + slave->np = np; +out: + return err; +} +static inline void slave_disable_netpoll(struct slave *slave) +{ + struct netpoll *np = slave->np; + + if (!np) + return; + + slave->np = NULL; + + __netpoll_free(np); +} + +static void bond_poll_controller(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave = NULL; + struct list_head *iter; + struct ad_info ad_info; + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + if (bond_3ad_get_active_agg_info(bond, &ad_info)) + return; + + bond_for_each_slave_rcu(bond, slave, iter) { + if (!bond_slave_is_up(slave)) + continue; + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct aggregator *agg = + SLAVE_AD_INFO(slave)->port.aggregator; + + if (agg && + agg->aggregator_identifier != ad_info.aggregator_id) + continue; + } + + netpoll_poll_dev(slave->dev); + } +} + +static void bond_netpoll_cleanup(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) + if (bond_slave_is_up(slave)) + slave_disable_netpoll(slave); +} + +static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) +{ + struct bonding *bond = netdev_priv(dev); + struct list_head *iter; + struct slave *slave; + int err = 0; + + bond_for_each_slave(bond, slave, iter) { + err = slave_enable_netpoll(slave); + if (err) { + bond_netpoll_cleanup(dev); + break; + } + } + return err; +} +#else +static inline int slave_enable_netpoll(struct slave *slave) +{ + return 0; +} +static inline void slave_disable_netpoll(struct slave *slave) +{ +} +static void bond_netpoll_cleanup(struct net_device *bond_dev) +{ +} +#endif + +/*---------------------------------- IOCTL ----------------------------------*/ + +static netdev_features_t bond_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct bonding *bond = netdev_priv(dev); + struct list_head *iter; + netdev_features_t mask; + struct slave *slave; + + mask = features; + + features &= ~NETIF_F_ONE_FOR_ALL; + features |= NETIF_F_ALL_FOR_ALL; + + bond_for_each_slave(bond, slave, iter) { + features = netdev_increment_features(features, + slave->dev->features, + mask); + } + features = netdev_add_tso_features(features, mask); + + return features; +} + +#define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ + NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ + NETIF_F_HIGHDMA | NETIF_F_LRO) + +#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ + NETIF_F_RXCSUM | NETIF_F_ALL_TSO) + +#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ + NETIF_F_ALL_TSO) + + +static void bond_compute_features(struct bonding *bond) +{ + unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | + IFF_XMIT_DST_RELEASE_PERM; + netdev_features_t vlan_features = BOND_VLAN_FEATURES; + netdev_features_t enc_features = BOND_ENC_FEATURES; +#ifdef CONFIG_XFRM_OFFLOAD + netdev_features_t xfrm_features = BOND_XFRM_FEATURES; +#endif /* CONFIG_XFRM_OFFLOAD */ + netdev_features_t mpls_features = BOND_MPLS_FEATURES; + struct net_device *bond_dev = bond->dev; + struct list_head *iter; + struct slave *slave; + unsigned short max_hard_header_len = ETH_HLEN; + unsigned int gso_max_size = GSO_MAX_SIZE; + u16 gso_max_segs = GSO_MAX_SEGS; + + if (!bond_has_slaves(bond)) + goto done; + vlan_features &= NETIF_F_ALL_FOR_ALL; + mpls_features &= NETIF_F_ALL_FOR_ALL; + + bond_for_each_slave(bond, slave, iter) { + vlan_features = netdev_increment_features(vlan_features, + slave->dev->vlan_features, BOND_VLAN_FEATURES); + + enc_features = netdev_increment_features(enc_features, + slave->dev->hw_enc_features, + BOND_ENC_FEATURES); + +#ifdef CONFIG_XFRM_OFFLOAD + xfrm_features = netdev_increment_features(xfrm_features, + slave->dev->hw_enc_features, + BOND_XFRM_FEATURES); +#endif /* CONFIG_XFRM_OFFLOAD */ + + mpls_features = netdev_increment_features(mpls_features, + slave->dev->mpls_features, + BOND_MPLS_FEATURES); + + dst_release_flag &= slave->dev->priv_flags; + if (slave->dev->hard_header_len > max_hard_header_len) + max_hard_header_len = slave->dev->hard_header_len; + + gso_max_size = min(gso_max_size, slave->dev->gso_max_size); + gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); + } + bond_dev->hard_header_len = max_hard_header_len; + +done: + bond_dev->vlan_features = vlan_features; + bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | + NETIF_F_HW_VLAN_CTAG_TX | + NETIF_F_HW_VLAN_STAG_TX | + NETIF_F_GSO_UDP_L4; +#ifdef CONFIG_XFRM_OFFLOAD + bond_dev->hw_enc_features |= xfrm_features; +#endif /* CONFIG_XFRM_OFFLOAD */ + bond_dev->mpls_features = mpls_features; + bond_dev->gso_max_segs = gso_max_segs; + netif_set_gso_max_size(bond_dev, gso_max_size); + + bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; + if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && + dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) + bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; + + netdev_change_features(bond_dev); +} + +static void bond_setup_by_slave(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + bool was_up = !!(bond_dev->flags & IFF_UP); + + dev_close(bond_dev); + + bond_dev->header_ops = slave_dev->header_ops; + + bond_dev->type = slave_dev->type; + bond_dev->hard_header_len = slave_dev->hard_header_len; + bond_dev->needed_headroom = slave_dev->needed_headroom; + bond_dev->addr_len = slave_dev->addr_len; + + memcpy(bond_dev->broadcast, slave_dev->broadcast, + slave_dev->addr_len); + + if (slave_dev->flags & IFF_POINTOPOINT) { + bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST); + bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP); + } + if (was_up) + dev_open(bond_dev, NULL); +} + +/* On bonding slaves other than the currently active slave, suppress + * duplicates except for alb non-mcast/bcast. + */ +static bool bond_should_deliver_exact_match(struct sk_buff *skb, + struct slave *slave, + struct bonding *bond) +{ + if (bond_is_slave_inactive(slave)) { + if (BOND_MODE(bond) == BOND_MODE_ALB && + skb->pkt_type != PACKET_BROADCAST && + skb->pkt_type != PACKET_MULTICAST) + return false; + return true; + } + return false; +} + +static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + struct slave *slave; + struct bonding *bond; + int (*recv_probe)(const struct sk_buff *, struct bonding *, + struct slave *); + int ret = RX_HANDLER_ANOTHER; + + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) + return RX_HANDLER_CONSUMED; + + *pskb = skb; + + slave = bond_slave_get_rcu(skb->dev); + bond = slave->bond; + + recv_probe = READ_ONCE(bond->recv_probe); + if (recv_probe) { + ret = recv_probe(skb, bond, slave); + if (ret == RX_HANDLER_CONSUMED) { + consume_skb(skb); + return ret; + } + } + + /* + * For packets determined by bond_should_deliver_exact_match() call to + * be suppressed we want to make an exception for link-local packets. + * This is necessary for e.g. LLDP daemons to be able to monitor + * inactive slave links without being forced to bind to them + * explicitly. + * + * At the same time, packets that are passed to the bonding master + * (including link-local ones) can have their originating interface + * determined via PACKET_ORIGDEV socket option. + */ + if (bond_should_deliver_exact_match(skb, slave, bond)) { + if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) + return RX_HANDLER_PASS; + return RX_HANDLER_EXACT; + } + + skb->dev = bond->dev; + + if (BOND_MODE(bond) == BOND_MODE_ALB && + netif_is_bridge_port(bond->dev) && + skb->pkt_type == PACKET_HOST) { + + if (unlikely(skb_cow_head(skb, + skb->data - skb_mac_header(skb)))) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, + bond->dev->addr_len); + } + + return ret; +} + +static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) +{ + switch (BOND_MODE(bond)) { + case BOND_MODE_ROUNDROBIN: + return NETDEV_LAG_TX_TYPE_ROUNDROBIN; + case BOND_MODE_ACTIVEBACKUP: + return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; + case BOND_MODE_BROADCAST: + return NETDEV_LAG_TX_TYPE_BROADCAST; + case BOND_MODE_XOR: + case BOND_MODE_8023AD: + return NETDEV_LAG_TX_TYPE_HASH; + default: + return NETDEV_LAG_TX_TYPE_UNKNOWN; + } +} + +static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, + enum netdev_lag_tx_type type) +{ + if (type != NETDEV_LAG_TX_TYPE_HASH) + return NETDEV_LAG_HASH_NONE; + + switch (bond->params.xmit_policy) { + case BOND_XMIT_POLICY_LAYER2: + return NETDEV_LAG_HASH_L2; + case BOND_XMIT_POLICY_LAYER34: + return NETDEV_LAG_HASH_L34; + case BOND_XMIT_POLICY_LAYER23: + return NETDEV_LAG_HASH_L23; + case BOND_XMIT_POLICY_ENCAP23: + return NETDEV_LAG_HASH_E23; + case BOND_XMIT_POLICY_ENCAP34: + return NETDEV_LAG_HASH_E34; + default: + return NETDEV_LAG_HASH_UNKNOWN; + } +} + +static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, + struct netlink_ext_ack *extack) +{ + struct netdev_lag_upper_info lag_upper_info; + enum netdev_lag_tx_type type; + + type = bond_lag_tx_type(bond); + lag_upper_info.tx_type = type; + lag_upper_info.hash_type = bond_lag_hash_type(bond, type); + + return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, + &lag_upper_info, extack); +} + +static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) +{ + netdev_upper_dev_unlink(slave->dev, bond->dev); + slave->dev->flags &= ~IFF_SLAVE; +} + +static void slave_kobj_release(struct kobject *kobj) +{ + struct slave *slave = to_slave(kobj); + struct bonding *bond = bond_get_bond_by_slave(slave); + + cancel_delayed_work_sync(&slave->notify_work); + if (BOND_MODE(bond) == BOND_MODE_8023AD) + kfree(SLAVE_AD_INFO(slave)); + + kfree(slave); +} + +static struct kobj_type slave_ktype = { + .release = slave_kobj_release, +#ifdef CONFIG_SYSFS + .sysfs_ops = &slave_sysfs_ops, +#endif +}; + +static int bond_kobj_init(struct slave *slave) +{ + int err; + + err = kobject_init_and_add(&slave->kobj, &slave_ktype, + &(slave->dev->dev.kobj), "bonding_slave"); + if (err) + kobject_put(&slave->kobj); + + return err; +} + +static struct slave *bond_alloc_slave(struct bonding *bond, + struct net_device *slave_dev) +{ + struct slave *slave = NULL; + + slave = kzalloc(sizeof(*slave), GFP_KERNEL); + if (!slave) + return NULL; + + slave->bond = bond; + slave->dev = slave_dev; + INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); + + if (bond_kobj_init(slave)) + return NULL; + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), + GFP_KERNEL); + if (!SLAVE_AD_INFO(slave)) { + kobject_put(&slave->kobj); + return NULL; + } + } + + return slave; +} + +static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) +{ + info->bond_mode = BOND_MODE(bond); + info->miimon = bond->params.miimon; + info->num_slaves = bond->slave_cnt; +} + +static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) +{ + strcpy(info->slave_name, slave->dev->name); + info->link = slave->link; + info->state = bond_slave_state(slave); + info->link_failure_count = slave->link_failure_count; +} + +static void bond_netdev_notify_work(struct work_struct *_work) +{ + struct slave *slave = container_of(_work, struct slave, + notify_work.work); + + if (rtnl_trylock()) { + struct netdev_bonding_info binfo; + + bond_fill_ifslave(slave, &binfo.slave); + bond_fill_ifbond(slave->bond, &binfo.master); + netdev_bonding_info_change(slave->dev, &binfo); + rtnl_unlock(); + } else { + queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); + } +} + +void bond_queue_slave_event(struct slave *slave) +{ + queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); +} + +void bond_lower_state_changed(struct slave *slave) +{ + struct netdev_lag_lower_state_info info; + + info.link_up = slave->link == BOND_LINK_UP || + slave->link == BOND_LINK_FAIL; + info.tx_enabled = bond_is_active_slave(slave); + netdev_lower_state_changed(slave->dev, &info); +} + +/* enslave device <slave> to bond device <master> */ +int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, + struct netlink_ext_ack *extack) +{ + struct bonding *bond = netdev_priv(bond_dev); + const struct net_device_ops *slave_ops = slave_dev->netdev_ops; + struct slave *new_slave = NULL, *prev_slave; + struct sockaddr_storage ss; + int link_reporting; + int res = 0, i; + + if (!bond->params.use_carrier && + slave_dev->ethtool_ops->get_link == NULL && + slave_ops->ndo_do_ioctl == NULL) { + slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); + } + + /* already in-use? */ + if (netdev_is_rx_handler_busy(slave_dev)) { + NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved"); + slave_err(bond_dev, slave_dev, + "Error: Device is in use and cannot be enslaved\n"); + return -EBUSY; + } + + if (bond_dev == slave_dev) { + NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself."); + netdev_err(bond_dev, "cannot enslave bond to itself.\n"); + return -EPERM; + } + + /* vlan challenged mutual exclusion */ + /* no need to lock since we're protected by rtnl_lock */ + if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { + slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); + if (vlan_uses_dev(bond_dev)) { + NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond"); + slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n"); + return -EPERM; + } else { + slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); + } + } else { + slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); + } + + if (slave_dev->features & NETIF_F_HW_ESP) + slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); + + /* Old ifenslave binaries are no longer supported. These can + * be identified with moderate accuracy by the state of the slave: + * the current ifenslave will set the interface down prior to + * enslaving it; the old ifenslave will not. + */ + if (slave_dev->flags & IFF_UP) { + NL_SET_ERR_MSG(extack, "Device can not be enslaved while up"); + slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n"); + return -EPERM; + } + + /* set bonding device ether type by slave - bonding netdevices are + * created with ether_setup, so when the slave type is not ARPHRD_ETHER + * there is a need to override some of the type dependent attribs/funcs. + * + * bond ether type mutual exclusion - don't allow slaves of dissimilar + * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond + */ + if (!bond_has_slaves(bond)) { + if (bond_dev->type != slave_dev->type) { + slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", + bond_dev->type, slave_dev->type); + + res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, + bond_dev); + res = notifier_to_errno(res); + if (res) { + slave_err(bond_dev, slave_dev, "refused to change device type\n"); + return -EBUSY; + } + + /* Flush unicast and multicast addresses */ + dev_uc_flush(bond_dev); + dev_mc_flush(bond_dev); + + if (slave_dev->type != ARPHRD_ETHER) + bond_setup_by_slave(bond_dev, slave_dev); + else { + ether_setup(bond_dev); + bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; + } + + call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, + bond_dev); + } + } else if (bond_dev->type != slave_dev->type) { + NL_SET_ERR_MSG(extack, "Device type is different from other slaves"); + slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n", + slave_dev->type, bond_dev->type); + return -EINVAL; + } + + if (slave_dev->type == ARPHRD_INFINIBAND && + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves"); + slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n", + slave_dev->type); + res = -EOPNOTSUPP; + goto err_undo_flags; + } + + if (!slave_ops->ndo_set_mac_address || + slave_dev->type == ARPHRD_INFINIBAND) { + slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && + bond->params.fail_over_mac != BOND_FOM_ACTIVE) { + if (!bond_has_slaves(bond)) { + bond->params.fail_over_mac = BOND_FOM_ACTIVE; + slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); + } else { + NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); + slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n"); + res = -EOPNOTSUPP; + goto err_undo_flags; + } + } + } + + call_netdevice_notifiers(NETDEV_JOIN, slave_dev); + + /* If this is the first slave, then we need to set the master's hardware + * address to be the same as the slave's. + */ + if (!bond_has_slaves(bond) && + bond->dev->addr_assign_type == NET_ADDR_RANDOM) { + res = bond_set_dev_addr(bond->dev, slave_dev); + if (res) + goto err_undo_flags; + } + + new_slave = bond_alloc_slave(bond, slave_dev); + if (!new_slave) { + res = -ENOMEM; + goto err_undo_flags; + } + + /* Set the new_slave's queue_id to be zero. Queue ID mapping + * is set via sysfs or module option if desired. + */ + new_slave->queue_id = 0; + + /* Save slave's original mtu and then set it to match the bond */ + new_slave->original_mtu = slave_dev->mtu; + res = dev_set_mtu(slave_dev, bond->dev->mtu); + if (res) { + slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); + goto err_free; + } + + /* Save slave's original ("permanent") mac address for modes + * that need it, and for restoring it upon release, and then + * set it to the master's address + */ + bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, + slave_dev->addr_len); + + if (!bond->params.fail_over_mac || + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + /* Set slave to master's mac address. The application already + * set the master's mac address to that of the first slave + */ + memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); + ss.ss_family = slave_dev->type; + res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, + extack); + if (res) { + slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); + goto err_restore_mtu; + } + } + + /* set slave flag before open to prevent IPv6 addrconf */ + slave_dev->flags |= IFF_SLAVE; + + /* open the slave since the application closed it */ + res = dev_open(slave_dev, extack); + if (res) { + slave_err(bond_dev, slave_dev, "Opening slave failed\n"); + goto err_restore_mac; + } + + slave_dev->priv_flags |= IFF_BONDING; + /* initialize slave stats */ + dev_get_stats(new_slave->dev, &new_slave->slave_stats); + + if (bond_is_lb(bond)) { + /* bond_alb_init_slave() must be called before all other stages since + * it might fail and we do not want to have to undo everything + */ + res = bond_alb_init_slave(bond, new_slave); + if (res) + goto err_close; + } + + res = vlan_vids_add_by_dev(slave_dev, bond_dev); + if (res) { + slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); + goto err_close; + } + + prev_slave = bond_last_slave(bond); + + new_slave->delay = 0; + new_slave->link_failure_count = 0; + + if (bond_update_speed_duplex(new_slave) && + bond_needs_speed_duplex(bond)) + new_slave->link = BOND_LINK_DOWN; + + new_slave->last_rx = jiffies - + (msecs_to_jiffies(bond->params.arp_interval) + 1); + for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) + new_slave->target_last_arp_rx[i] = new_slave->last_rx; + + if (bond->params.miimon && !bond->params.use_carrier) { + link_reporting = bond_check_dev_link(bond, slave_dev, 1); + + if ((link_reporting == -1) && !bond->params.arp_interval) { + /* miimon is set but a bonded network driver + * does not support ETHTOOL/MII and + * arp_interval is not set. Note: if + * use_carrier is enabled, we will never go + * here (because netif_carrier is always + * supported); thus, we don't need to change + * the messages for netif_carrier. + */ + slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n"); + } else if (link_reporting == -1) { + /* unable get link status using mii/ethtool */ + slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n"); + } + } + + /* check for initial state */ + new_slave->link = BOND_LINK_NOCHANGE; + if (bond->params.miimon) { + if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { + if (bond->params.updelay) { + bond_set_slave_link_state(new_slave, + BOND_LINK_BACK, + BOND_SLAVE_NOTIFY_NOW); + new_slave->delay = bond->params.updelay; + } else { + bond_set_slave_link_state(new_slave, + BOND_LINK_UP, + BOND_SLAVE_NOTIFY_NOW); + } + } else { + bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, + BOND_SLAVE_NOTIFY_NOW); + } + } else if (bond->params.arp_interval) { + bond_set_slave_link_state(new_slave, + (netif_carrier_ok(slave_dev) ? + BOND_LINK_UP : BOND_LINK_DOWN), + BOND_SLAVE_NOTIFY_NOW); + } else { + bond_set_slave_link_state(new_slave, BOND_LINK_UP, + BOND_SLAVE_NOTIFY_NOW); + } + + if (new_slave->link != BOND_LINK_DOWN) + new_slave->last_link_up = jiffies; + slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", + new_slave->link == BOND_LINK_DOWN ? "DOWN" : + (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); + + if (bond_uses_primary(bond) && bond->params.primary[0]) { + /* if there is a primary slave, remember it */ + if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { + rcu_assign_pointer(bond->primary_slave, new_slave); + bond->force_primary = true; + } + } + + switch (BOND_MODE(bond)) { + case BOND_MODE_ACTIVEBACKUP: + bond_set_slave_inactive_flags(new_slave, + BOND_SLAVE_NOTIFY_NOW); + break; + case BOND_MODE_8023AD: + /* in 802.3ad mode, the internal mechanism + * will activate the slaves in the selected + * aggregator + */ + bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); + /* if this is the first slave */ + if (!prev_slave) { + SLAVE_AD_INFO(new_slave)->id = 1; + /* Initialize AD with the number of times that the AD timer is called in 1 second + * can be called only after the mac address of the bond is set + */ + bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); + } else { + SLAVE_AD_INFO(new_slave)->id = + SLAVE_AD_INFO(prev_slave)->id + 1; + } + + bond_3ad_bind_slave(new_slave); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + bond_set_active_slave(new_slave); + bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); + break; + default: + slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); + + /* always active in trunk mode */ + bond_set_active_slave(new_slave); + + /* In trunking mode there is little meaning to curr_active_slave + * anyway (it holds no special properties of the bond device), + * so we can change it without calling change_active_interface() + */ + if (!rcu_access_pointer(bond->curr_active_slave) && + new_slave->link == BOND_LINK_UP) + rcu_assign_pointer(bond->curr_active_slave, new_slave); + + break; + } /* switch(bond_mode) */ + +#ifdef CONFIG_NET_POLL_CONTROLLER + if (bond->dev->npinfo) { + if (slave_enable_netpoll(new_slave)) { + slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); + res = -EBUSY; + goto err_detach; + } + } +#endif + + if (!(bond_dev->features & NETIF_F_LRO)) + dev_disable_lro(slave_dev); + + res = netdev_rx_handler_register(slave_dev, bond_handle_frame, + new_slave); + if (res) { + slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); + goto err_detach; + } + + res = bond_master_upper_dev_link(bond, new_slave, extack); + if (res) { + slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); + goto err_unregister; + } + + res = bond_sysfs_slave_add(new_slave); + if (res) { + slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); + goto err_upper_unlink; + } + + /* If the mode uses primary, then the following is handled by + * bond_change_active_slave(). + */ + if (!bond_uses_primary(bond)) { + /* set promiscuity level to new slave */ + if (bond_dev->flags & IFF_PROMISC) { + res = dev_set_promiscuity(slave_dev, 1); + if (res) + goto err_sysfs_del; + } + + /* set allmulti level to new slave */ + if (bond_dev->flags & IFF_ALLMULTI) { + res = dev_set_allmulti(slave_dev, 1); + if (res) { + if (bond_dev->flags & IFF_PROMISC) + dev_set_promiscuity(slave_dev, -1); + goto err_sysfs_del; + } + } + + if (bond_dev->flags & IFF_UP) { + netif_addr_lock_bh(bond_dev); + dev_mc_sync_multiple(slave_dev, bond_dev); + dev_uc_sync_multiple(slave_dev, bond_dev); + netif_addr_unlock_bh(bond_dev); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + dev_mc_add(slave_dev, lacpdu_mcast_addr); + } + } + + bond->slave_cnt++; + bond_compute_features(bond); + bond_set_carrier(bond); + + if (bond_uses_primary(bond)) { + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + } + + if (bond_mode_can_use_xmit_hash(bond)) + bond_update_slave_arr(bond, NULL); + + + slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", + bond_is_active_slave(new_slave) ? "an active" : "a backup", + new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); + + /* enslave is successful */ + bond_queue_slave_event(new_slave); + return 0; + +/* Undo stages on error */ +err_sysfs_del: + bond_sysfs_slave_del(new_slave); + +err_upper_unlink: + bond_upper_dev_unlink(bond, new_slave); + +err_unregister: + netdev_rx_handler_unregister(slave_dev); + +err_detach: + vlan_vids_del_by_dev(slave_dev, bond_dev); + if (rcu_access_pointer(bond->primary_slave) == new_slave) + RCU_INIT_POINTER(bond->primary_slave, NULL); + if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { + block_netpoll_tx(); + bond_change_active_slave(bond, NULL); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + } + /* either primary_slave or curr_active_slave might've changed */ + synchronize_rcu(); + slave_disable_netpoll(new_slave); + +err_close: + if (!netif_is_bond_master(slave_dev)) + slave_dev->priv_flags &= ~IFF_BONDING; + dev_close(slave_dev); + +err_restore_mac: + slave_dev->flags &= ~IFF_SLAVE; + if (!bond->params.fail_over_mac || + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + /* XXX TODO - fom follow mode needs to change master's + * MAC if this slave's MAC is in use by the bond, or at + * least print a warning. + */ + bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, + new_slave->dev->addr_len); + ss.ss_family = slave_dev->type; + dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); + } + +err_restore_mtu: + dev_set_mtu(slave_dev, new_slave->original_mtu); + +err_free: + kobject_put(&new_slave->kobj); + +err_undo_flags: + /* Enslave of first slave has failed and we need to fix master's mac */ + if (!bond_has_slaves(bond)) { + if (ether_addr_equal_64bits(bond_dev->dev_addr, + slave_dev->dev_addr)) + eth_hw_addr_random(bond_dev); + if (bond_dev->type != ARPHRD_ETHER) { + dev_close(bond_dev); + ether_setup(bond_dev); + bond_dev->flags |= IFF_MASTER; + bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; + } + } + + return res; +} + +/* Try to release the slave device <slave> from the bond device <master> + * It is legal to access curr_active_slave without a lock because all the function + * is RTNL-locked. If "all" is true it means that the function is being called + * while destroying a bond interface and all slaves are being released. + * + * The rules for slave state should be: + * for Active/Backup: + * Active stays on all backups go down + * for Bonded connections: + * The first up interface should be left on and all others downed. + */ +static int __bond_release_one(struct net_device *bond_dev, + struct net_device *slave_dev, + bool all, bool unregister) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *oldcurrent; + struct sockaddr_storage ss; + int old_flags = bond_dev->flags; + netdev_features_t old_features = bond_dev->features; + + /* slave is not a slave or master is not master of this slave */ + if (!(slave_dev->flags & IFF_SLAVE) || + !netdev_has_upper_dev(slave_dev, bond_dev)) { + slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); + return -EINVAL; + } + + block_netpoll_tx(); + + slave = bond_get_slave_by_dev(bond, slave_dev); + if (!slave) { + /* not a slave of this bond */ + slave_info(bond_dev, slave_dev, "interface not enslaved\n"); + unblock_netpoll_tx(); + return -EINVAL; + } + + bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); + + bond_sysfs_slave_del(slave); + + /* recompute stats just before removing the slave */ + bond_get_stats(bond->dev, &bond->bond_stats); + + /* unregister rx_handler early so bond_handle_frame wouldn't be called + * for this slave anymore. + */ + netdev_rx_handler_unregister(slave_dev); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + bond_3ad_unbind_slave(slave); + + bond_upper_dev_unlink(bond, slave); + + if (bond_mode_can_use_xmit_hash(bond)) + bond_update_slave_arr(bond, slave); + + slave_info(bond_dev, slave_dev, "Releasing %s interface\n", + bond_is_active_slave(slave) ? "active" : "backup"); + + oldcurrent = rcu_access_pointer(bond->curr_active_slave); + + RCU_INIT_POINTER(bond->current_arp_slave, NULL); + + if (!all && (!bond->params.fail_over_mac || + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { + if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && + bond_has_slaves(bond)) + slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n", + slave->perm_hwaddr); + } + + if (rtnl_dereference(bond->primary_slave) == slave) + RCU_INIT_POINTER(bond->primary_slave, NULL); + + if (oldcurrent == slave) + bond_change_active_slave(bond, NULL); + + if (bond_is_lb(bond)) { + /* Must be called only after the slave has been + * detached from the list and the curr_active_slave + * has been cleared (if our_slave == old_current), + * but before a new active slave is selected. + */ + bond_alb_deinit_slave(bond, slave); + } + + if (all) { + RCU_INIT_POINTER(bond->curr_active_slave, NULL); + } else if (oldcurrent == slave) { + /* Note that we hold RTNL over this sequence, so there + * is no concern that another slave add/remove event + * will interfere. + */ + bond_select_active_slave(bond); + } + + bond_set_carrier(bond); + if (!bond_has_slaves(bond)) + eth_hw_addr_random(bond_dev); + + unblock_netpoll_tx(); + synchronize_rcu(); + bond->slave_cnt--; + + if (!bond_has_slaves(bond)) { + call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); + call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); + } + + bond_compute_features(bond); + if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && + (old_features & NETIF_F_VLAN_CHALLENGED)) + slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); + + vlan_vids_del_by_dev(slave_dev, bond_dev); + + /* If the mode uses primary, then this case was handled above by + * bond_change_active_slave(..., NULL) + */ + if (!bond_uses_primary(bond)) { + /* unset promiscuity level from slave + * NOTE: The NETDEV_CHANGEADDR call above may change the value + * of the IFF_PROMISC flag in the bond_dev, but we need the + * value of that flag before that change, as that was the value + * when this slave was attached, so we cache at the start of the + * function and use it here. Same goes for ALLMULTI below + */ + if (old_flags & IFF_PROMISC) + dev_set_promiscuity(slave_dev, -1); + + /* unset allmulti level from slave */ + if (old_flags & IFF_ALLMULTI) + dev_set_allmulti(slave_dev, -1); + + if (old_flags & IFF_UP) + bond_hw_addr_flush(bond_dev, slave_dev); + } + + slave_disable_netpoll(slave); + + /* close slave before restoring its mac address */ + dev_close(slave_dev); + + if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + /* restore original ("permanent") mac address */ + bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, + slave->dev->addr_len); + ss.ss_family = slave_dev->type; + dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); + } + + if (unregister) + __dev_set_mtu(slave_dev, slave->original_mtu); + else + dev_set_mtu(slave_dev, slave->original_mtu); + + if (!netif_is_bond_master(slave_dev)) + slave_dev->priv_flags &= ~IFF_BONDING; + + kobject_put(&slave->kobj); + + return 0; +} + +/* A wrapper used because of ndo_del_link */ +int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) +{ + return __bond_release_one(bond_dev, slave_dev, false, false); +} + +/* First release a slave and then destroy the bond if no more slaves are left. + * Must be under rtnl_lock when this function is called. + */ +static int bond_release_and_destroy(struct net_device *bond_dev, + struct net_device *slave_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + int ret; + + ret = __bond_release_one(bond_dev, slave_dev, false, true); + if (ret == 0 && !bond_has_slaves(bond) && + bond_dev->reg_state != NETREG_UNREGISTERING) { + bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; + netdev_info(bond_dev, "Destroying bond\n"); + bond_remove_proc_entry(bond); + unregister_netdevice(bond_dev); + } + return ret; +} + +static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) +{ + struct bonding *bond = netdev_priv(bond_dev); + bond_fill_ifbond(bond, info); +} + +static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + int i = 0, res = -ENODEV; + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) { + if (i++ == (int)info->slave_id) { + res = 0; + bond_fill_ifslave(slave, info); + break; + } + } + + return res; +} + +/*-------------------------------- Monitoring -------------------------------*/ + +/* called with rcu_read_lock() */ +static int bond_miimon_inspect(struct bonding *bond) +{ + bool ignore_updelay = false; + int link_state, commit = 0; + struct list_head *iter; + struct slave *slave; + + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { + ignore_updelay = !rcu_dereference(bond->curr_active_slave); + } else { + struct bond_up_slave *usable_slaves; + + usable_slaves = rcu_dereference(bond->usable_slaves); + + if (usable_slaves && usable_slaves->count == 0) + ignore_updelay = true; + } + + bond_for_each_slave_rcu(bond, slave, iter) { + bond_propose_link_state(slave, BOND_LINK_NOCHANGE); + + link_state = bond_check_dev_link(bond, slave->dev, 0); + + switch (slave->link) { + case BOND_LINK_UP: + if (link_state) + continue; + + bond_propose_link_state(slave, BOND_LINK_FAIL); + commit++; + slave->delay = bond->params.downdelay; + if (slave->delay) { + slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", + (BOND_MODE(bond) == + BOND_MODE_ACTIVEBACKUP) ? + (bond_is_active_slave(slave) ? + "active " : "backup ") : "", + bond->params.downdelay * bond->params.miimon); + } + fallthrough; + case BOND_LINK_FAIL: + if (link_state) { + /* recovered before downdelay expired */ + bond_propose_link_state(slave, BOND_LINK_UP); + slave->last_link_up = jiffies; + slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", + (bond->params.downdelay - slave->delay) * + bond->params.miimon); + commit++; + continue; + } + + if (slave->delay <= 0) { + bond_propose_link_state(slave, BOND_LINK_DOWN); + commit++; + continue; + } + + slave->delay--; + break; + + case BOND_LINK_DOWN: + if (!link_state) + continue; + + bond_propose_link_state(slave, BOND_LINK_BACK); + commit++; + slave->delay = bond->params.updelay; + + if (slave->delay) { + slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", + ignore_updelay ? 0 : + bond->params.updelay * + bond->params.miimon); + } + fallthrough; + case BOND_LINK_BACK: + if (!link_state) { + bond_propose_link_state(slave, BOND_LINK_DOWN); + slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", + (bond->params.updelay - slave->delay) * + bond->params.miimon); + commit++; + continue; + } + + if (ignore_updelay) + slave->delay = 0; + + if (slave->delay <= 0) { + bond_propose_link_state(slave, BOND_LINK_UP); + commit++; + ignore_updelay = false; + continue; + } + + slave->delay--; + break; + } + } + + return commit; +} + +static void bond_miimon_link_change(struct bonding *bond, + struct slave *slave, + char link) +{ + switch (BOND_MODE(bond)) { + case BOND_MODE_8023AD: + bond_3ad_handle_link_change(slave, link); + break; + case BOND_MODE_TLB: + case BOND_MODE_ALB: + bond_alb_handle_link_change(bond, slave, link); + break; + case BOND_MODE_XOR: + bond_update_slave_arr(bond, NULL); + break; + } +} + +static void bond_miimon_commit(struct bonding *bond) +{ + struct list_head *iter; + struct slave *slave, *primary; + + bond_for_each_slave(bond, slave, iter) { + switch (slave->link_new_state) { + case BOND_LINK_NOCHANGE: + /* For 802.3ad mode, check current slave speed and + * duplex again in case its port was disabled after + * invalid speed/duplex reporting but recovered before + * link monitoring could make a decision on the actual + * link status + */ + if (BOND_MODE(bond) == BOND_MODE_8023AD && + slave->link == BOND_LINK_UP) + bond_3ad_adapter_speed_duplex_changed(slave); + continue; + + case BOND_LINK_UP: + if (bond_update_speed_duplex(slave) && + bond_needs_speed_duplex(bond)) { + slave->link = BOND_LINK_DOWN; + if (net_ratelimit()) + slave_warn(bond->dev, slave->dev, + "failed to get link speed/duplex\n"); + continue; + } + bond_set_slave_link_state(slave, BOND_LINK_UP, + BOND_SLAVE_NOTIFY_NOW); + slave->last_link_up = jiffies; + + primary = rtnl_dereference(bond->primary_slave); + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + /* prevent it from being the active one */ + bond_set_backup_slave(slave); + } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + /* make it immediately active */ + bond_set_active_slave(slave); + } + + slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", + slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, + slave->duplex ? "full" : "half"); + + bond_miimon_link_change(bond, slave, BOND_LINK_UP); + + if (!bond->curr_active_slave || slave == primary) + goto do_failover; + + continue; + + case BOND_LINK_DOWN: + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + bond_set_slave_link_state(slave, BOND_LINK_DOWN, + BOND_SLAVE_NOTIFY_NOW); + + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || + BOND_MODE(bond) == BOND_MODE_8023AD) + bond_set_slave_inactive_flags(slave, + BOND_SLAVE_NOTIFY_NOW); + + slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); + + bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); + + if (slave == rcu_access_pointer(bond->curr_active_slave)) + goto do_failover; + + continue; + + default: + slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", + slave->link_new_state); + bond_propose_link_state(slave, BOND_LINK_NOCHANGE); + + continue; + } + +do_failover: + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + } + + bond_set_carrier(bond); +} + +/* bond_mii_monitor + * + * Really a wrapper that splits the mii monitor into two phases: an + * inspection, then (if inspection indicates something needs to be done) + * an acquisition of appropriate locks followed by a commit phase to + * implement whatever link state changes are indicated. + */ +static void bond_mii_monitor(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + mii_work.work); + bool should_notify_peers = false; + bool commit; + unsigned long delay; + struct slave *slave; + struct list_head *iter; + + delay = msecs_to_jiffies(bond->params.miimon); + + if (!bond_has_slaves(bond)) + goto re_arm; + + rcu_read_lock(); + should_notify_peers = bond_should_notify_peers(bond); + commit = !!bond_miimon_inspect(bond); + if (bond->send_peer_notif) { + rcu_read_unlock(); + if (rtnl_trylock()) { + bond->send_peer_notif--; + rtnl_unlock(); + } + } else { + rcu_read_unlock(); + } + + if (commit) { + /* Race avoidance with bond_close cancel of workqueue */ + if (!rtnl_trylock()) { + delay = 1; + should_notify_peers = false; + goto re_arm; + } + + bond_for_each_slave(bond, slave, iter) { + bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); + } + bond_miimon_commit(bond); + + rtnl_unlock(); /* might sleep, hold no other locks */ + } + +re_arm: + if (bond->params.miimon) + queue_delayed_work(bond->wq, &bond->mii_work, delay); + + if (should_notify_peers) { + if (!rtnl_trylock()) + return; + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); + rtnl_unlock(); + } +} + +static int bond_upper_dev_walk(struct net_device *upper, + struct netdev_nested_priv *priv) +{ + __be32 ip = *(__be32 *)priv->data; + + return ip == bond_confirm_addr(upper, 0, ip); +} + +static bool bond_has_this_ip(struct bonding *bond, __be32 ip) +{ + struct netdev_nested_priv priv = { + .data = (void *)&ip, + }; + bool ret = false; + + if (ip == bond_confirm_addr(bond->dev, 0, ip)) + return true; + + rcu_read_lock(); + if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) + ret = true; + rcu_read_unlock(); + + return ret; +} + +/* We go to the (large) trouble of VLAN tagging ARP frames because + * switches in VLAN mode (especially if ports are configured as + * "native" to a VLAN) might not pass non-tagged frames. + */ +static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, + __be32 src_ip, struct bond_vlan_tag *tags) +{ + struct sk_buff *skb; + struct bond_vlan_tag *outer_tag = tags; + struct net_device *slave_dev = slave->dev; + struct net_device *bond_dev = slave->bond->dev; + + slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", + arp_op, &dest_ip, &src_ip); + + skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, + NULL, slave_dev->dev_addr, NULL); + + if (!skb) { + net_err_ratelimited("ARP packet allocation failed\n"); + return; + } + + if (!tags || tags->vlan_proto == VLAN_N_VID) + goto xmit; + + tags++; + + /* Go through all the tags backwards and add them to the packet */ + while (tags->vlan_proto != VLAN_N_VID) { + if (!tags->vlan_id) { + tags++; + continue; + } + + slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", + ntohs(outer_tag->vlan_proto), tags->vlan_id); + skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, + tags->vlan_id); + if (!skb) { + net_err_ratelimited("failed to insert inner VLAN tag\n"); + return; + } + + tags++; + } + /* Set the outer tag */ + if (outer_tag->vlan_id) { + slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", + ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); + __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, + outer_tag->vlan_id); + } + +xmit: + arp_xmit(skb); +} + +/* Validate the device path between the @start_dev and the @end_dev. + * The path is valid if the @end_dev is reachable through device + * stacking. + * When the path is validated, collect any vlan information in the + * path. + */ +struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, + struct net_device *end_dev, + int level) +{ + struct bond_vlan_tag *tags; + struct net_device *upper; + struct list_head *iter; + + if (start_dev == end_dev) { + tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); + if (!tags) + return ERR_PTR(-ENOMEM); + tags[level].vlan_proto = VLAN_N_VID; + return tags; + } + + netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { + tags = bond_verify_device_path(upper, end_dev, level + 1); + if (IS_ERR_OR_NULL(tags)) { + if (IS_ERR(tags)) + return tags; + continue; + } + if (is_vlan_dev(upper)) { + tags[level].vlan_proto = vlan_dev_vlan_proto(upper); + tags[level].vlan_id = vlan_dev_vlan_id(upper); + } + + return tags; + } + + return NULL; +} + +static void bond_arp_send_all(struct bonding *bond, struct slave *slave) +{ + struct rtable *rt; + struct bond_vlan_tag *tags; + __be32 *targets = bond->params.arp_targets, addr; + int i; + + for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { + slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", + __func__, &targets[i]); + tags = NULL; + + /* Find out through which dev should the packet go */ + rt = ip_route_output(dev_net(bond->dev), targets[i], 0, + RTO_ONLINK, 0); + if (IS_ERR(rt)) { + /* there's no route to target - try to send arp + * probe to generate any traffic (arp_validate=0) + */ + if (bond->params.arp_validate) + net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", + bond->dev->name, + &targets[i]); + bond_arp_send(slave, ARPOP_REQUEST, targets[i], + 0, tags); + continue; + } + + /* bond device itself */ + if (rt->dst.dev == bond->dev) + goto found; + + rcu_read_lock(); + tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); + rcu_read_unlock(); + + if (!IS_ERR_OR_NULL(tags)) + goto found; + + /* Not our device - skip */ + slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", + &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); + + ip_rt_put(rt); + continue; + +found: + addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); + ip_rt_put(rt); + bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); + kfree(tags); + } +} + +static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) +{ + int i; + + if (!sip || !bond_has_this_ip(bond, tip)) { + slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", + __func__, &sip, &tip); + return; + } + + i = bond_get_targets_ip(bond->params.arp_targets, sip); + if (i == -1) { + slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", + __func__, &sip); + return; + } + slave->last_rx = jiffies; + slave->target_last_arp_rx[i] = jiffies; +} + +int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct arphdr *arp = (struct arphdr *)skb->data; + struct slave *curr_active_slave, *curr_arp_slave; + unsigned char *arp_ptr; + __be32 sip, tip; + int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); + unsigned int alen; + + if (!slave_do_arp_validate(bond, slave)) { + if ((slave_do_arp_validate_only(bond) && is_arp) || + !slave_do_arp_validate_only(bond)) + slave->last_rx = jiffies; + return RX_HANDLER_ANOTHER; + } else if (!is_arp) { + return RX_HANDLER_ANOTHER; + } + + alen = arp_hdr_len(bond->dev); + + slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", + __func__, skb->dev->name); + + if (alen > skb_headlen(skb)) { + arp = kmalloc(alen, GFP_ATOMIC); + if (!arp) + goto out_unlock; + if (skb_copy_bits(skb, 0, arp, alen) < 0) + goto out_unlock; + } + + if (arp->ar_hln != bond->dev->addr_len || + skb->pkt_type == PACKET_OTHERHOST || + skb->pkt_type == PACKET_LOOPBACK || + arp->ar_hrd != htons(ARPHRD_ETHER) || + arp->ar_pro != htons(ETH_P_IP) || + arp->ar_pln != 4) + goto out_unlock; + + arp_ptr = (unsigned char *)(arp + 1); + arp_ptr += bond->dev->addr_len; + memcpy(&sip, arp_ptr, 4); + arp_ptr += 4 + bond->dev->addr_len; + memcpy(&tip, arp_ptr, 4); + + slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", + __func__, slave->dev->name, bond_slave_state(slave), + bond->params.arp_validate, slave_do_arp_validate(bond, slave), + &sip, &tip); + + curr_active_slave = rcu_dereference(bond->curr_active_slave); + curr_arp_slave = rcu_dereference(bond->current_arp_slave); + + /* We 'trust' the received ARP enough to validate it if: + * + * (a) the slave receiving the ARP is active (which includes the + * current ARP slave, if any), or + * + * (b) the receiving slave isn't active, but there is a currently + * active slave and it received valid arp reply(s) after it became + * the currently active slave, or + * + * (c) there is an ARP slave that sent an ARP during the prior ARP + * interval, and we receive an ARP reply on any slave. We accept + * these because switch FDB update delays may deliver the ARP + * reply to a slave other than the sender of the ARP request. + * + * Note: for (b), backup slaves are receiving the broadcast ARP + * request, not a reply. This request passes from the sending + * slave through the L2 switch(es) to the receiving slave. Since + * this is checking the request, sip/tip are swapped for + * validation. + * + * This is done to avoid endless looping when we can't reach the + * arp_ip_target and fool ourselves with our own arp requests. + */ + if (bond_is_active_slave(slave)) + bond_validate_arp(bond, slave, sip, tip); + else if (curr_active_slave && + time_after(slave_last_rx(bond, curr_active_slave), + curr_active_slave->last_link_up)) + bond_validate_arp(bond, slave, tip, sip); + else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && + bond_time_in_interval(bond, + dev_trans_start(curr_arp_slave->dev), 1)) + bond_validate_arp(bond, slave, sip, tip); + +out_unlock: + if (arp != (struct arphdr *)skb->data) + kfree(arp); + return RX_HANDLER_ANOTHER; +} + +/* function to verify if we're in the arp_interval timeslice, returns true if + * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + + * arp_interval/2) . the arp_interval/2 is needed for really fast networks. + */ +static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, + int mod) +{ + int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); + + return time_in_range(jiffies, + last_act - delta_in_ticks, + last_act + mod * delta_in_ticks + delta_in_ticks/2); +} + +/* This function is called regularly to monitor each slave's link + * ensuring that traffic is being sent and received when arp monitoring + * is used in load-balancing mode. if the adapter has been dormant, then an + * arp is transmitted to generate traffic. see activebackup_arp_monitor for + * arp monitoring in active backup mode. + */ +static void bond_loadbalance_arp_mon(struct bonding *bond) +{ + struct slave *slave, *oldcurrent; + struct list_head *iter; + int do_failover = 0, slave_state_changed = 0; + + if (!bond_has_slaves(bond)) + goto re_arm; + + rcu_read_lock(); + + oldcurrent = rcu_dereference(bond->curr_active_slave); + /* see if any of the previous devices are up now (i.e. they have + * xmt and rcv traffic). the curr_active_slave does not come into + * the picture unless it is null. also, slave->last_link_up is not + * needed here because we send an arp on each slave and give a slave + * as long as it needs to get the tx/rx within the delta. + * TODO: what about up/down delay in arp mode? it wasn't here before + * so it can wait + */ + bond_for_each_slave_rcu(bond, slave, iter) { + unsigned long trans_start = dev_trans_start(slave->dev); + + bond_propose_link_state(slave, BOND_LINK_NOCHANGE); + + if (slave->link != BOND_LINK_UP) { + if (bond_time_in_interval(bond, trans_start, 1) && + bond_time_in_interval(bond, slave->last_rx, 1)) { + + bond_propose_link_state(slave, BOND_LINK_UP); + slave_state_changed = 1; + + /* primary_slave has no meaning in round-robin + * mode. the window of a slave being up and + * curr_active_slave being null after enslaving + * is closed. + */ + if (!oldcurrent) { + slave_info(bond->dev, slave->dev, "link status definitely up\n"); + do_failover = 1; + } else { + slave_info(bond->dev, slave->dev, "interface is now up\n"); + } + } + } else { + /* slave->link == BOND_LINK_UP */ + + /* not all switches will respond to an arp request + * when the source ip is 0, so don't take the link down + * if we don't know our ip yet + */ + if (!bond_time_in_interval(bond, trans_start, 2) || + !bond_time_in_interval(bond, slave->last_rx, 2)) { + + bond_propose_link_state(slave, BOND_LINK_DOWN); + slave_state_changed = 1; + + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + slave_info(bond->dev, slave->dev, "interface is now down\n"); + + if (slave == oldcurrent) + do_failover = 1; + } + } + + /* note: if switch is in round-robin mode, all links + * must tx arp to ensure all links rx an arp - otherwise + * links may oscillate or not come up at all; if switch is + * in something like xor mode, there is nothing we can + * do - all replies will be rx'ed on same link causing slaves + * to be unstable during low/no traffic periods + */ + if (bond_slave_is_up(slave)) + bond_arp_send_all(bond, slave); + } + + rcu_read_unlock(); + + if (do_failover || slave_state_changed) { + if (!rtnl_trylock()) + goto re_arm; + + bond_for_each_slave(bond, slave, iter) { + if (slave->link_new_state != BOND_LINK_NOCHANGE) + slave->link = slave->link_new_state; + } + + if (slave_state_changed) { + bond_slave_state_change(bond); + if (BOND_MODE(bond) == BOND_MODE_XOR) + bond_update_slave_arr(bond, NULL); + } + if (do_failover) { + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + } + rtnl_unlock(); + } + +re_arm: + if (bond->params.arp_interval) + queue_delayed_work(bond->wq, &bond->arp_work, + msecs_to_jiffies(bond->params.arp_interval)); +} + +/* Called to inspect slaves for active-backup mode ARP monitor link state + * changes. Sets proposed link state in slaves to specify what action + * should take place for the slave. Returns 0 if no changes are found, >0 + * if changes to link states must be committed. + * + * Called with rcu_read_lock held. + */ +static int bond_ab_arp_inspect(struct bonding *bond) +{ + unsigned long trans_start, last_rx; + struct list_head *iter; + struct slave *slave; + int commit = 0; + + bond_for_each_slave_rcu(bond, slave, iter) { + bond_propose_link_state(slave, BOND_LINK_NOCHANGE); + last_rx = slave_last_rx(bond, slave); + + if (slave->link != BOND_LINK_UP) { + if (bond_time_in_interval(bond, last_rx, 1)) { + bond_propose_link_state(slave, BOND_LINK_UP); + commit++; + } else if (slave->link == BOND_LINK_BACK) { + bond_propose_link_state(slave, BOND_LINK_FAIL); + commit++; + } + continue; + } + + /* Give slaves 2*delta after being enslaved or made + * active. This avoids bouncing, as the last receive + * times need a full ARP monitor cycle to be updated. + */ + if (bond_time_in_interval(bond, slave->last_link_up, 2)) + continue; + + /* Backup slave is down if: + * - No current_arp_slave AND + * - more than 3*delta since last receive AND + * - the bond has an IP address + * + * Note: a non-null current_arp_slave indicates + * the curr_active_slave went down and we are + * searching for a new one; under this condition + * we only take the curr_active_slave down - this + * gives each slave a chance to tx/rx traffic + * before being taken out + */ + if (!bond_is_active_slave(slave) && + !rcu_access_pointer(bond->current_arp_slave) && + !bond_time_in_interval(bond, last_rx, 3)) { + bond_propose_link_state(slave, BOND_LINK_DOWN); + commit++; + } + + /* Active slave is down if: + * - more than 2*delta since transmitting OR + * - (more than 2*delta since receive AND + * the bond has an IP address) + */ + trans_start = dev_trans_start(slave->dev); + if (bond_is_active_slave(slave) && + (!bond_time_in_interval(bond, trans_start, 2) || + !bond_time_in_interval(bond, last_rx, 2))) { + bond_propose_link_state(slave, BOND_LINK_DOWN); + commit++; + } + } + + return commit; +} + +/* Called to commit link state changes noted by inspection step of + * active-backup mode ARP monitor. + * + * Called with RTNL hold. + */ +static void bond_ab_arp_commit(struct bonding *bond) +{ + unsigned long trans_start; + struct list_head *iter; + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) { + switch (slave->link_new_state) { + case BOND_LINK_NOCHANGE: + continue; + + case BOND_LINK_UP: + trans_start = dev_trans_start(slave->dev); + if (rtnl_dereference(bond->curr_active_slave) != slave || + (!rtnl_dereference(bond->curr_active_slave) && + bond_time_in_interval(bond, trans_start, 1))) { + struct slave *current_arp_slave; + + current_arp_slave = rtnl_dereference(bond->current_arp_slave); + bond_set_slave_link_state(slave, BOND_LINK_UP, + BOND_SLAVE_NOTIFY_NOW); + if (current_arp_slave) { + bond_set_slave_inactive_flags( + current_arp_slave, + BOND_SLAVE_NOTIFY_NOW); + RCU_INIT_POINTER(bond->current_arp_slave, NULL); + } + + slave_info(bond->dev, slave->dev, "link status definitely up\n"); + + if (!rtnl_dereference(bond->curr_active_slave) || + slave == rtnl_dereference(bond->primary_slave)) + goto do_failover; + + } + + continue; + + case BOND_LINK_DOWN: + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + bond_set_slave_link_state(slave, BOND_LINK_DOWN, + BOND_SLAVE_NOTIFY_NOW); + bond_set_slave_inactive_flags(slave, + BOND_SLAVE_NOTIFY_NOW); + + slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); + + if (slave == rtnl_dereference(bond->curr_active_slave)) { + RCU_INIT_POINTER(bond->current_arp_slave, NULL); + goto do_failover; + } + + continue; + + case BOND_LINK_FAIL: + bond_set_slave_link_state(slave, BOND_LINK_FAIL, + BOND_SLAVE_NOTIFY_NOW); + bond_set_slave_inactive_flags(slave, + BOND_SLAVE_NOTIFY_NOW); + + /* A slave has just been enslaved and has become + * the current active slave. + */ + if (rtnl_dereference(bond->curr_active_slave)) + RCU_INIT_POINTER(bond->current_arp_slave, NULL); + continue; + + default: + slave_err(bond->dev, slave->dev, + "impossible: link_new_state %d on slave\n", + slave->link_new_state); + continue; + } + +do_failover: + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + } + + bond_set_carrier(bond); +} + +/* Send ARP probes for active-backup mode ARP monitor. + * + * Called with rcu_read_lock held. + */ +static bool bond_ab_arp_probe(struct bonding *bond) +{ + struct slave *slave, *before = NULL, *new_slave = NULL, + *curr_arp_slave = rcu_dereference(bond->current_arp_slave), + *curr_active_slave = rcu_dereference(bond->curr_active_slave); + struct list_head *iter; + bool found = false; + bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; + + if (curr_arp_slave && curr_active_slave) + netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", + curr_arp_slave->dev->name, + curr_active_slave->dev->name); + + if (curr_active_slave) { + bond_arp_send_all(bond, curr_active_slave); + return should_notify_rtnl; + } + + /* if we don't have a curr_active_slave, search for the next available + * backup slave from the current_arp_slave and make it the candidate + * for becoming the curr_active_slave + */ + + if (!curr_arp_slave) { + curr_arp_slave = bond_first_slave_rcu(bond); + if (!curr_arp_slave) + return should_notify_rtnl; + } + + bond_for_each_slave_rcu(bond, slave, iter) { + if (!found && !before && bond_slave_is_up(slave)) + before = slave; + + if (found && !new_slave && bond_slave_is_up(slave)) + new_slave = slave; + /* if the link state is up at this point, we + * mark it down - this can happen if we have + * simultaneous link failures and + * reselect_active_interface doesn't make this + * one the current slave so it is still marked + * up when it is actually down + */ + if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { + bond_set_slave_link_state(slave, BOND_LINK_DOWN, + BOND_SLAVE_NOTIFY_LATER); + if (slave->link_failure_count < UINT_MAX) + slave->link_failure_count++; + + bond_set_slave_inactive_flags(slave, + BOND_SLAVE_NOTIFY_LATER); + + slave_info(bond->dev, slave->dev, "backup interface is now down\n"); + } + if (slave == curr_arp_slave) + found = true; + } + + if (!new_slave && before) + new_slave = before; + + if (!new_slave) + goto check_state; + + bond_set_slave_link_state(new_slave, BOND_LINK_BACK, + BOND_SLAVE_NOTIFY_LATER); + bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); + bond_arp_send_all(bond, new_slave); + new_slave->last_link_up = jiffies; + rcu_assign_pointer(bond->current_arp_slave, new_slave); + +check_state: + bond_for_each_slave_rcu(bond, slave, iter) { + if (slave->should_notify || slave->should_notify_link) { + should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; + break; + } + } + return should_notify_rtnl; +} + +static void bond_activebackup_arp_mon(struct bonding *bond) +{ + bool should_notify_peers = false; + bool should_notify_rtnl = false; + int delta_in_ticks; + + delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); + + if (!bond_has_slaves(bond)) + goto re_arm; + + rcu_read_lock(); + + should_notify_peers = bond_should_notify_peers(bond); + + if (bond_ab_arp_inspect(bond)) { + rcu_read_unlock(); + + /* Race avoidance with bond_close flush of workqueue */ + if (!rtnl_trylock()) { + delta_in_ticks = 1; + should_notify_peers = false; + goto re_arm; + } + + bond_ab_arp_commit(bond); + + rtnl_unlock(); + rcu_read_lock(); + } + + should_notify_rtnl = bond_ab_arp_probe(bond); + rcu_read_unlock(); + +re_arm: + if (bond->params.arp_interval) + queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); + + if (should_notify_peers || should_notify_rtnl) { + if (!rtnl_trylock()) + return; + + if (should_notify_peers) { + bond->send_peer_notif--; + call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, + bond->dev); + } + if (should_notify_rtnl) { + bond_slave_state_notify(bond); + bond_slave_link_notify(bond); + } + + rtnl_unlock(); + } +} + +static void bond_arp_monitor(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + arp_work.work); + + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) + bond_activebackup_arp_mon(bond); + else + bond_loadbalance_arp_mon(bond); +} + +/*-------------------------- netdev event handling --------------------------*/ + +/* Change device name */ +static int bond_event_changename(struct bonding *bond) +{ + bond_remove_proc_entry(bond); + bond_create_proc_entry(bond); + + bond_debug_reregister(bond); + + return NOTIFY_DONE; +} + +static int bond_master_netdev_event(unsigned long event, + struct net_device *bond_dev) +{ + struct bonding *event_bond = netdev_priv(bond_dev); + + netdev_dbg(bond_dev, "%s called\n", __func__); + + switch (event) { + case NETDEV_CHANGENAME: + return bond_event_changename(event_bond); + case NETDEV_UNREGISTER: + bond_remove_proc_entry(event_bond); +#ifdef CONFIG_XFRM_OFFLOAD + xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); +#endif /* CONFIG_XFRM_OFFLOAD */ + break; + case NETDEV_REGISTER: + bond_create_proc_entry(event_bond); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +static int bond_slave_netdev_event(unsigned long event, + struct net_device *slave_dev) +{ + struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; + struct bonding *bond; + struct net_device *bond_dev; + + /* A netdev event can be generated while enslaving a device + * before netdev_rx_handler_register is called in which case + * slave will be NULL + */ + if (!slave) { + netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); + return NOTIFY_DONE; + } + + bond_dev = slave->bond->dev; + bond = slave->bond; + primary = rtnl_dereference(bond->primary_slave); + + slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); + + switch (event) { + case NETDEV_UNREGISTER: + if (bond_dev->type != ARPHRD_ETHER) + bond_release_and_destroy(bond_dev, slave_dev); + else + __bond_release_one(bond_dev, slave_dev, false, true); + break; + case NETDEV_UP: + case NETDEV_CHANGE: + /* For 802.3ad mode only: + * Getting invalid Speed/Duplex values here will put slave + * in weird state. Mark it as link-fail if the link was + * previously up or link-down if it hasn't yet come up, and + * let link-monitoring (miimon) set it right when correct + * speeds/duplex are available. + */ + if (bond_update_speed_duplex(slave) && + BOND_MODE(bond) == BOND_MODE_8023AD) { + if (slave->last_link_up) + slave->link = BOND_LINK_FAIL; + else + slave->link = BOND_LINK_DOWN; + } + + if (BOND_MODE(bond) == BOND_MODE_8023AD) + bond_3ad_adapter_speed_duplex_changed(slave); + fallthrough; + case NETDEV_DOWN: + /* Refresh slave-array if applicable! + * If the setup does not use miimon or arpmon (mode-specific!), + * then these events will not cause the slave-array to be + * refreshed. This will cause xmit to use a slave that is not + * usable. Avoid such situation by refeshing the array at these + * events. If these (miimon/arpmon) parameters are configured + * then array gets refreshed twice and that should be fine! + */ + if (bond_mode_can_use_xmit_hash(bond)) + bond_update_slave_arr(bond, NULL); + break; + case NETDEV_CHANGEMTU: + /* TODO: Should slaves be allowed to + * independently alter their MTU? For + * an active-backup bond, slaves need + * not be the same type of device, so + * MTUs may vary. For other modes, + * slaves arguably should have the + * same MTUs. To do this, we'd need to + * take over the slave's change_mtu + * function for the duration of their + * servitude. + */ + break; + case NETDEV_CHANGENAME: + /* we don't care if we don't have primary set */ + if (!bond_uses_primary(bond) || + !bond->params.primary[0]) + break; + + if (slave == primary) { + /* slave's name changed - he's no longer primary */ + RCU_INIT_POINTER(bond->primary_slave, NULL); + } else if (!strcmp(slave_dev->name, bond->params.primary)) { + /* we have a new primary slave */ + rcu_assign_pointer(bond->primary_slave, slave); + } else { /* we didn't change primary - exit */ + break; + } + + netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", + primary ? slave_dev->name : "none"); + + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + break; + case NETDEV_FEAT_CHANGE: + if (!bond->notifier_ctx) { + bond->notifier_ctx = true; + bond_compute_features(bond); + bond->notifier_ctx = false; + } + break; + case NETDEV_RESEND_IGMP: + /* Propagate to master device */ + call_netdevice_notifiers(event, slave->bond->dev); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +/* bond_netdev_event: handle netdev notifier chain events. + * + * This function receives events for the netdev chain. The caller (an + * ioctl handler calling blocking_notifier_call_chain) holds the necessary + * locks for us to safely manipulate the slave devices (RTNL lock, + * dev_probe_lock). + */ +static int bond_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); + + netdev_dbg(event_dev, "%s received %s\n", + __func__, netdev_cmd_to_name(event)); + + if (!(event_dev->priv_flags & IFF_BONDING)) + return NOTIFY_DONE; + + if (event_dev->flags & IFF_MASTER) { + int ret; + + ret = bond_master_netdev_event(event, event_dev); + if (ret != NOTIFY_DONE) + return ret; + } + + if (event_dev->flags & IFF_SLAVE) + return bond_slave_netdev_event(event, event_dev); + + return NOTIFY_DONE; +} + +static struct notifier_block bond_netdev_notifier = { + .notifier_call = bond_netdev_event, +}; + +/*---------------------------- Hashing Policies -----------------------------*/ + +/* L2 hash helper */ +static inline u32 bond_eth_hash(struct sk_buff *skb) +{ + struct ethhdr *ep, hdr_tmp; + + ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); + if (ep) + return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; + return 0; +} + +static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, + int *noff, int *proto, bool l34) +{ + const struct ipv6hdr *iph6; + const struct iphdr *iph; + + if (skb->protocol == htons(ETH_P_IP)) { + if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph)))) + return false; + iph = (const struct iphdr *)(skb->data + *noff); + iph_to_flow_copy_v4addrs(fk, iph); + *noff += iph->ihl << 2; + if (!ip_is_fragment(iph)) + *proto = iph->protocol; + } else if (skb->protocol == htons(ETH_P_IPV6)) { + if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6)))) + return false; + iph6 = (const struct ipv6hdr *)(skb->data + *noff); + iph_to_flow_copy_v6addrs(fk, iph6); + *noff += sizeof(*iph6); + *proto = iph6->nexthdr; + } else { + return false; + } + + if (l34 && *proto >= 0) + fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto); + + return true; +} + +/* Extract the appropriate headers based on bond's xmit policy */ +static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, + struct flow_keys *fk) +{ + bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; + int noff, proto = -1; + + if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) { + memset(fk, 0, sizeof(*fk)); + return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, + fk, NULL, 0, 0, 0, 0); + } + + fk->ports.ports = 0; + memset(&fk->icmp, 0, sizeof(fk->icmp)); + noff = skb_network_offset(skb); + if (!bond_flow_ip(skb, fk, &noff, &proto, l34)) + return false; + + /* ICMP error packets contains at least 8 bytes of the header + * of the packet which generated the error. Use this information + * to correlate ICMP error packets within the same flow which + * generated the error. + */ + if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) { + skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data, + skb_transport_offset(skb), + skb_headlen(skb)); + if (proto == IPPROTO_ICMP) { + if (!icmp_is_err(fk->icmp.type)) + return true; + + noff += sizeof(struct icmphdr); + } else if (proto == IPPROTO_ICMPV6) { + if (!icmpv6_is_err(fk->icmp.type)) + return true; + + noff += sizeof(struct icmp6hdr); + } + return bond_flow_ip(skb, fk, &noff, &proto, l34); + } + + return true; +} + +/** + * bond_xmit_hash - generate a hash value based on the xmit policy + * @bond: bonding device + * @skb: buffer to use for headers + * + * This function will extract the necessary headers from the skb buffer and use + * them to generate a hash based on the xmit_policy set in the bonding device + */ +u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) +{ + struct flow_keys flow; + u32 hash; + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && + skb->l4_hash) + return skb->hash; + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || + !bond_flow_dissect(bond, skb, &flow)) + return bond_eth_hash(skb); + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || + bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { + hash = bond_eth_hash(skb); + } else { + if (flow.icmp.id) + memcpy(&hash, &flow.icmp, sizeof(hash)); + else + memcpy(&hash, &flow.ports.ports, sizeof(hash)); + } + hash ^= (__force u32)flow_get_u32_dst(&flow) ^ + (__force u32)flow_get_u32_src(&flow); + hash ^= (hash >> 16); + hash ^= (hash >> 8); + + return hash >> 1; +} + +/*-------------------------- Device entry points ----------------------------*/ + +void bond_work_init_all(struct bonding *bond) +{ + INIT_DELAYED_WORK(&bond->mcast_work, + bond_resend_igmp_join_requests_delayed); + INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); + INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); + INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); + INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); + INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); +} + +static void bond_work_cancel_all(struct bonding *bond) +{ + cancel_delayed_work_sync(&bond->mii_work); + cancel_delayed_work_sync(&bond->arp_work); + cancel_delayed_work_sync(&bond->alb_work); + cancel_delayed_work_sync(&bond->ad_work); + cancel_delayed_work_sync(&bond->mcast_work); + cancel_delayed_work_sync(&bond->slave_arr_work); +} + +static int bond_open(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + struct slave *slave; + + /* reset slave->backup and slave->inactive */ + if (bond_has_slaves(bond)) { + bond_for_each_slave(bond, slave, iter) { + if (bond_uses_primary(bond) && + slave != rcu_access_pointer(bond->curr_active_slave)) { + bond_set_slave_inactive_flags(slave, + BOND_SLAVE_NOTIFY_NOW); + } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { + bond_set_slave_active_flags(slave, + BOND_SLAVE_NOTIFY_NOW); + } + } + } + + if (bond_is_lb(bond)) { + /* bond_alb_initialize must be called before the timer + * is started. + */ + if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) + return -ENOMEM; + if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) + queue_delayed_work(bond->wq, &bond->alb_work, 0); + } + + if (bond->params.miimon) /* link check interval, in milliseconds. */ + queue_delayed_work(bond->wq, &bond->mii_work, 0); + + if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ + queue_delayed_work(bond->wq, &bond->arp_work, 0); + bond->recv_probe = bond_arp_rcv; + } + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + queue_delayed_work(bond->wq, &bond->ad_work, 0); + /* register to receive LACPDUs */ + bond->recv_probe = bond_3ad_lacpdu_recv; + bond_3ad_initiate_agg_selection(bond, 1); + + bond_for_each_slave(bond, slave, iter) + dev_mc_add(slave->dev, lacpdu_mcast_addr); + } + + if (bond_mode_can_use_xmit_hash(bond)) + bond_update_slave_arr(bond, NULL); + + return 0; +} + +static int bond_close(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + + bond_work_cancel_all(bond); + bond->send_peer_notif = 0; + if (bond_is_lb(bond)) + bond_alb_deinitialize(bond); + bond->recv_probe = NULL; + + if (bond_uses_primary(bond)) { + rcu_read_lock(); + slave = rcu_dereference(bond->curr_active_slave); + if (slave) + bond_hw_addr_flush(bond_dev, slave->dev); + rcu_read_unlock(); + } else { + struct list_head *iter; + + bond_for_each_slave(bond, slave, iter) + bond_hw_addr_flush(bond_dev, slave->dev); + } + + return 0; +} + +/* fold stats, assuming all rtnl_link_stats64 fields are u64, but + * that some drivers can provide 32bit values only. + */ +static void bond_fold_stats(struct rtnl_link_stats64 *_res, + const struct rtnl_link_stats64 *_new, + const struct rtnl_link_stats64 *_old) +{ + const u64 *new = (const u64 *)_new; + const u64 *old = (const u64 *)_old; + u64 *res = (u64 *)_res; + int i; + + for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { + u64 nv = new[i]; + u64 ov = old[i]; + s64 delta = nv - ov; + + /* detects if this particular field is 32bit only */ + if (((nv | ov) >> 32) == 0) + delta = (s64)(s32)((u32)nv - (u32)ov); + + /* filter anomalies, some drivers reset their stats + * at down/up events. + */ + if (delta > 0) + res[i] += delta; + } +} + +#ifdef CONFIG_LOCKDEP +static int bond_get_lowest_level_rcu(struct net_device *dev) +{ + struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; + struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; + int cur = 0, max = 0; + + now = dev; + iter = &dev->adj_list.lower; + + while (1) { + next = NULL; + while (1) { + ldev = netdev_next_lower_dev_rcu(now, &iter); + if (!ldev) + break; + + next = ldev; + niter = &ldev->adj_list.lower; + dev_stack[cur] = now; + iter_stack[cur++] = iter; + if (max <= cur) + max = cur; + break; + } + + if (!next) { + if (!cur) + return max; + next = dev_stack[--cur]; + niter = iter_stack[cur]; + } + + now = next; + iter = niter; + } + + return max; +} +#endif + +static void bond_get_stats(struct net_device *bond_dev, + struct rtnl_link_stats64 *stats) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct rtnl_link_stats64 temp; + struct list_head *iter; + struct slave *slave; + int nest_level = 0; + + + rcu_read_lock(); +#ifdef CONFIG_LOCKDEP + nest_level = bond_get_lowest_level_rcu(bond_dev); +#endif + + spin_lock_nested(&bond->stats_lock, nest_level); + memcpy(stats, &bond->bond_stats, sizeof(*stats)); + + bond_for_each_slave_rcu(bond, slave, iter) { + const struct rtnl_link_stats64 *new = + dev_get_stats(slave->dev, &temp); + + bond_fold_stats(stats, new, &slave->slave_stats); + + /* save off the slave stats for the next run */ + memcpy(&slave->slave_stats, new, sizeof(*new)); + } + + memcpy(&bond->bond_stats, stats, sizeof(*stats)); + spin_unlock(&bond->stats_lock); + rcu_read_unlock(); +} + +static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct net_device *slave_dev = NULL; + struct ifbond k_binfo; + struct ifbond __user *u_binfo = NULL; + struct ifslave k_sinfo; + struct ifslave __user *u_sinfo = NULL; + struct mii_ioctl_data *mii = NULL; + struct bond_opt_value newval; + struct net *net; + int res = 0; + + netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); + + switch (cmd) { + case SIOCGMIIPHY: + mii = if_mii(ifr); + if (!mii) + return -EINVAL; + + mii->phy_id = 0; + fallthrough; + case SIOCGMIIREG: + /* We do this again just in case we were called by SIOCGMIIREG + * instead of SIOCGMIIPHY. + */ + mii = if_mii(ifr); + if (!mii) + return -EINVAL; + + if (mii->reg_num == 1) { + mii->val_out = 0; + if (netif_carrier_ok(bond->dev)) + mii->val_out = BMSR_LSTATUS; + } + + return 0; + case BOND_INFO_QUERY_OLD: + case SIOCBONDINFOQUERY: + u_binfo = (struct ifbond __user *)ifr->ifr_data; + + if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) + return -EFAULT; + + bond_info_query(bond_dev, &k_binfo); + if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) + return -EFAULT; + + return 0; + case BOND_SLAVE_INFO_QUERY_OLD: + case SIOCBONDSLAVEINFOQUERY: + u_sinfo = (struct ifslave __user *)ifr->ifr_data; + + if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) + return -EFAULT; + + res = bond_slave_info_query(bond_dev, &k_sinfo); + if (res == 0 && + copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) + return -EFAULT; + + return res; + default: + break; + } + + net = dev_net(bond_dev); + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + slave_dev = __dev_get_by_name(net, ifr->ifr_slave); + + slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); + + if (!slave_dev) + return -ENODEV; + + switch (cmd) { + case BOND_ENSLAVE_OLD: + case SIOCBONDENSLAVE: + res = bond_enslave(bond_dev, slave_dev, NULL); + break; + case BOND_RELEASE_OLD: + case SIOCBONDRELEASE: + res = bond_release(bond_dev, slave_dev); + break; + case BOND_SETHWADDR_OLD: + case SIOCBONDSETHWADDR: + res = bond_set_dev_addr(bond_dev, slave_dev); + break; + case BOND_CHANGE_ACTIVE_OLD: + case SIOCBONDCHANGEACTIVE: + bond_opt_initstr(&newval, slave_dev->name); + res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, + &newval); + break; + default: + res = -EOPNOTSUPP; + } + + return res; +} + +static void bond_change_rx_flags(struct net_device *bond_dev, int change) +{ + struct bonding *bond = netdev_priv(bond_dev); + + if (change & IFF_PROMISC) + bond_set_promiscuity(bond, + bond_dev->flags & IFF_PROMISC ? 1 : -1); + + if (change & IFF_ALLMULTI) + bond_set_allmulti(bond, + bond_dev->flags & IFF_ALLMULTI ? 1 : -1); +} + +static void bond_set_rx_mode(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + struct slave *slave; + + rcu_read_lock(); + if (bond_uses_primary(bond)) { + slave = rcu_dereference(bond->curr_active_slave); + if (slave) { + dev_uc_sync(slave->dev, bond_dev); + dev_mc_sync(slave->dev, bond_dev); + } + } else { + bond_for_each_slave_rcu(bond, slave, iter) { + dev_uc_sync_multiple(slave->dev, bond_dev); + dev_mc_sync_multiple(slave->dev, bond_dev); + } + } + rcu_read_unlock(); +} + +static int bond_neigh_init(struct neighbour *n) +{ + struct bonding *bond = netdev_priv(n->dev); + const struct net_device_ops *slave_ops; + struct neigh_parms parms; + struct slave *slave; + int ret = 0; + + rcu_read_lock(); + slave = bond_first_slave_rcu(bond); + if (!slave) + goto out; + slave_ops = slave->dev->netdev_ops; + if (!slave_ops->ndo_neigh_setup) + goto out; + + /* TODO: find another way [1] to implement this. + * Passing a zeroed structure is fragile, + * but at least we do not pass garbage. + * + * [1] One way would be that ndo_neigh_setup() never touch + * struct neigh_parms, but propagate the new neigh_setup() + * back to ___neigh_create() / neigh_parms_alloc() + */ + memset(&parms, 0, sizeof(parms)); + ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); + + if (ret) + goto out; + + if (parms.neigh_setup) + ret = parms.neigh_setup(n); +out: + rcu_read_unlock(); + return ret; +} + +/* The bonding ndo_neigh_setup is called at init time beofre any + * slave exists. So we must declare proxy setup function which will + * be used at run time to resolve the actual slave neigh param setup. + * + * It's also called by master devices (such as vlans) to setup their + * underlying devices. In that case - do nothing, we're already set up from + * our init. + */ +static int bond_neigh_setup(struct net_device *dev, + struct neigh_parms *parms) +{ + /* modify only our neigh_parms */ + if (parms->dev == dev) + parms->neigh_setup = bond_neigh_init; + + return 0; +} + +/* Change the MTU of all of a master's slaves to match the master */ +static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *rollback_slave; + struct list_head *iter; + int res = 0; + + netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); + + bond_for_each_slave(bond, slave, iter) { + slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", + slave, slave->dev->netdev_ops->ndo_change_mtu); + + res = dev_set_mtu(slave->dev, new_mtu); + + if (res) { + /* If we failed to set the slave's mtu to the new value + * we must abort the operation even in ACTIVE_BACKUP + * mode, because if we allow the backup slaves to have + * different mtu values than the active slave we'll + * need to change their mtu when doing a failover. That + * means changing their mtu from timer context, which + * is probably not a good idea. + */ + slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", + res, new_mtu); + goto unwind; + } + } + + bond_dev->mtu = new_mtu; + + return 0; + +unwind: + /* unwind from head to the slave that failed */ + bond_for_each_slave(bond, rollback_slave, iter) { + int tmp_res; + + if (rollback_slave == slave) + break; + + tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); + if (tmp_res) + slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", + tmp_res); + } + + return res; +} + +/* Change HW address + * + * Note that many devices must be down to change the HW address, and + * downing the master releases all slaves. We can make bonds full of + * bonding devices to test this, however. + */ +static int bond_set_mac_address(struct net_device *bond_dev, void *addr) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave, *rollback_slave; + struct sockaddr_storage *ss = addr, tmp_ss; + struct list_head *iter; + int res = 0; + + if (BOND_MODE(bond) == BOND_MODE_ALB) + return bond_alb_set_mac_address(bond_dev, addr); + + + netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); + + /* If fail_over_mac is enabled, do nothing and return success. + * Returning an error causes ifenslave to fail. + */ + if (bond->params.fail_over_mac && + BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) + return 0; + + if (!is_valid_ether_addr(ss->__data)) + return -EADDRNOTAVAIL; + + bond_for_each_slave(bond, slave, iter) { + slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", + __func__, slave); + res = dev_set_mac_address(slave->dev, addr, NULL); + if (res) { + /* TODO: consider downing the slave + * and retry ? + * User should expect communications + * breakage anyway until ARP finish + * updating, so... + */ + slave_dbg(bond_dev, slave->dev, "%s: err %d\n", + __func__, res); + goto unwind; + } + } + + /* success */ + memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); + return 0; + +unwind: + memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); + tmp_ss.ss_family = bond_dev->type; + + /* unwind from head to the slave that failed */ + bond_for_each_slave(bond, rollback_slave, iter) { + int tmp_res; + + if (rollback_slave == slave) + break; + + tmp_res = dev_set_mac_address(rollback_slave->dev, + (struct sockaddr *)&tmp_ss, NULL); + if (tmp_res) { + slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", + __func__, tmp_res); + } + } + + return res; +} + +/** + * bond_get_slave_by_id - get xmit slave with slave_id + * @bond: bonding device that is transmitting + * @slave_id: slave id up to slave_cnt-1 through which to transmit + * + * This function tries to get slave with slave_id but in case + * it fails, it tries to find the first available slave for transmission. + */ +static struct slave *bond_get_slave_by_id(struct bonding *bond, + int slave_id) +{ + struct list_head *iter; + struct slave *slave; + int i = slave_id; + + /* Here we start from the slave with slave_id */ + bond_for_each_slave_rcu(bond, slave, iter) { + if (--i < 0) { + if (bond_slave_can_tx(slave)) + return slave; + } + } + + /* Here we start from the first slave up to slave_id */ + i = slave_id; + bond_for_each_slave_rcu(bond, slave, iter) { + if (--i < 0) + break; + if (bond_slave_can_tx(slave)) + return slave; + } + /* no slave that can tx has been found */ + return NULL; +} + +/** + * bond_rr_gen_slave_id - generate slave id based on packets_per_slave + * @bond: bonding device to use + * + * Based on the value of the bonding device's packets_per_slave parameter + * this function generates a slave id, which is usually used as the next + * slave to transmit through. + */ +static u32 bond_rr_gen_slave_id(struct bonding *bond) +{ + u32 slave_id; + struct reciprocal_value reciprocal_packets_per_slave; + int packets_per_slave = bond->params.packets_per_slave; + + switch (packets_per_slave) { + case 0: + slave_id = prandom_u32(); + break; + case 1: + slave_id = bond->rr_tx_counter; + break; + default: + reciprocal_packets_per_slave = + bond->params.reciprocal_packets_per_slave; + slave_id = reciprocal_divide(bond->rr_tx_counter, + reciprocal_packets_per_slave); + break; + } + bond->rr_tx_counter++; + + return slave_id; +} + +static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, + struct sk_buff *skb) +{ + struct slave *slave; + int slave_cnt; + u32 slave_id; + + /* Start with the curr_active_slave that joined the bond as the + * default for sending IGMP traffic. For failover purposes one + * needs to maintain some consistency for the interface that will + * send the join/membership reports. The curr_active_slave found + * will send all of this type of traffic. + */ + if (skb->protocol == htons(ETH_P_IP)) { + int noff = skb_network_offset(skb); + struct iphdr *iph; + + if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) + goto non_igmp; + + iph = ip_hdr(skb); + if (iph->protocol == IPPROTO_IGMP) { + slave = rcu_dereference(bond->curr_active_slave); + if (slave) + return slave; + return bond_get_slave_by_id(bond, 0); + } + } + +non_igmp: + slave_cnt = READ_ONCE(bond->slave_cnt); + if (likely(slave_cnt)) { + slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; + return bond_get_slave_by_id(bond, slave_id); + } + return NULL; +} + +static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, + struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + + slave = bond_xmit_roundrobin_slave_get(bond, skb); + if (likely(slave)) + return bond_dev_queue_xmit(bond, skb, slave->dev); + + return bond_tx_drop(bond_dev, skb); +} + +static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond, + struct sk_buff *skb) +{ + return rcu_dereference(bond->curr_active_slave); +} + +/* In active-backup mode, we know that bond->curr_active_slave is always valid if + * the bond has a usable interface. + */ +static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, + struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + + slave = bond_xmit_activebackup_slave_get(bond, skb); + if (slave) + return bond_dev_queue_xmit(bond, skb, slave->dev); + + return bond_tx_drop(bond_dev, skb); +} + +/* Use this to update slave_array when (a) it's not appropriate to update + * slave_array right away (note that update_slave_array() may sleep) + * and / or (b) RTNL is not held. + */ +void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) +{ + queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); +} + +/* Slave array work handler. Holds only RTNL */ +static void bond_slave_arr_handler(struct work_struct *work) +{ + struct bonding *bond = container_of(work, struct bonding, + slave_arr_work.work); + int ret; + + if (!rtnl_trylock()) + goto err; + + ret = bond_update_slave_arr(bond, NULL); + rtnl_unlock(); + if (ret) { + pr_warn_ratelimited("Failed to update slave array from WT\n"); + goto err; + } + return; + +err: + bond_slave_arr_work_rearm(bond, 1); +} + +static void bond_skip_slave(struct bond_up_slave *slaves, + struct slave *skipslave) +{ + int idx; + + /* Rare situation where caller has asked to skip a specific + * slave but allocation failed (most likely!). BTW this is + * only possible when the call is initiated from + * __bond_release_one(). In this situation; overwrite the + * skipslave entry in the array with the last entry from the + * array to avoid a situation where the xmit path may choose + * this to-be-skipped slave to send a packet out. + */ + for (idx = 0; slaves && idx < slaves->count; idx++) { + if (skipslave == slaves->arr[idx]) { + slaves->arr[idx] = + slaves->arr[slaves->count - 1]; + slaves->count--; + break; + } + } +} + +static void bond_set_slave_arr(struct bonding *bond, + struct bond_up_slave *usable_slaves, + struct bond_up_slave *all_slaves) +{ + struct bond_up_slave *usable, *all; + + usable = rtnl_dereference(bond->usable_slaves); + rcu_assign_pointer(bond->usable_slaves, usable_slaves); + kfree_rcu(usable, rcu); + + all = rtnl_dereference(bond->all_slaves); + rcu_assign_pointer(bond->all_slaves, all_slaves); + kfree_rcu(all, rcu); +} + +static void bond_reset_slave_arr(struct bonding *bond) +{ + struct bond_up_slave *usable, *all; + + usable = rtnl_dereference(bond->usable_slaves); + if (usable) { + RCU_INIT_POINTER(bond->usable_slaves, NULL); + kfree_rcu(usable, rcu); + } + + all = rtnl_dereference(bond->all_slaves); + if (all) { + RCU_INIT_POINTER(bond->all_slaves, NULL); + kfree_rcu(all, rcu); + } +} + +/* Build the usable slaves array in control path for modes that use xmit-hash + * to determine the slave interface - + * (a) BOND_MODE_8023AD + * (b) BOND_MODE_XOR + * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 + * + * The caller is expected to hold RTNL only and NO other lock! + */ +int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) +{ + struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; + struct slave *slave; + struct list_head *iter; + int agg_id = 0; + int ret = 0; + +#ifdef CONFIG_LOCKDEP + WARN_ON(lockdep_is_held(&bond->mode_lock)); +#endif + + usable_slaves = kzalloc(struct_size(usable_slaves, arr, + bond->slave_cnt), GFP_KERNEL); + all_slaves = kzalloc(struct_size(all_slaves, arr, + bond->slave_cnt), GFP_KERNEL); + if (!usable_slaves || !all_slaves) { + ret = -ENOMEM; + goto out; + } + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct ad_info ad_info; + + if (bond_3ad_get_active_agg_info(bond, &ad_info)) { + pr_debug("bond_3ad_get_active_agg_info failed\n"); + /* No active aggragator means it's not safe to use + * the previous array. + */ + bond_reset_slave_arr(bond); + goto out; + } + agg_id = ad_info.aggregator_id; + } + bond_for_each_slave(bond, slave, iter) { + if (skipslave == slave) + continue; + + all_slaves->arr[all_slaves->count++] = slave; + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct aggregator *agg; + + agg = SLAVE_AD_INFO(slave)->port.aggregator; + if (!agg || agg->aggregator_identifier != agg_id) + continue; + } + if (!bond_slave_can_tx(slave)) + continue; + + slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", + usable_slaves->count); + + usable_slaves->arr[usable_slaves->count++] = slave; + } + + bond_set_slave_arr(bond, usable_slaves, all_slaves); + return ret; +out: + if (ret != 0 && skipslave) { + bond_skip_slave(rtnl_dereference(bond->all_slaves), + skipslave); + bond_skip_slave(rtnl_dereference(bond->usable_slaves), + skipslave); + } + kfree_rcu(all_slaves, rcu); + kfree_rcu(usable_slaves, rcu); + + return ret; +} + +static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, + struct sk_buff *skb, + struct bond_up_slave *slaves) +{ + struct slave *slave; + unsigned int count; + u32 hash; + + hash = bond_xmit_hash(bond, skb); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (unlikely(!count)) + return NULL; + + slave = slaves->arr[hash % count]; + return slave; +} + +/* Use this Xmit function for 3AD as well as XOR modes. The current + * usable slave array is formed in the control path. The xmit function + * just calculates hash and sends the packet out. + */ +static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct bonding *bond = netdev_priv(dev); + struct bond_up_slave *slaves; + struct slave *slave; + + slaves = rcu_dereference(bond->usable_slaves); + slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); + if (likely(slave)) + return bond_dev_queue_xmit(bond, skb, slave->dev); + + return bond_tx_drop(dev, skb); +} + +/* in broadcast mode, we send everything to all usable interfaces. */ +static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, + struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave = NULL; + struct list_head *iter; + bool xmit_suc = false; + bool skb_used = false; + + bond_for_each_slave_rcu(bond, slave, iter) { + struct sk_buff *skb2; + + if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) + continue; + + if (bond_is_last_slave(bond, slave)) { + skb2 = skb; + skb_used = true; + } else { + skb2 = skb_clone(skb, GFP_ATOMIC); + if (!skb2) { + net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", + bond_dev->name, __func__); + continue; + } + } + + if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) + xmit_suc = true; + } + + if (!skb_used) + dev_kfree_skb_any(skb); + + if (xmit_suc) + return NETDEV_TX_OK; + + atomic_long_inc(&bond_dev->tx_dropped); + return NET_XMIT_DROP; +} + +/*------------------------- Device initialization ---------------------------*/ + +/* Lookup the slave that corresponds to a qid */ +static inline int bond_slave_override(struct bonding *bond, + struct sk_buff *skb) +{ + struct slave *slave = NULL; + struct list_head *iter; + + if (!skb_rx_queue_recorded(skb)) + return 1; + + /* Find out if any slaves have the same mapping as this skb. */ + bond_for_each_slave_rcu(bond, slave, iter) { + if (slave->queue_id == skb_get_queue_mapping(skb)) { + if (bond_slave_is_up(slave) && + slave->link == BOND_LINK_UP) { + bond_dev_queue_xmit(bond, skb, slave->dev); + return 0; + } + /* If the slave isn't UP, use default transmit policy. */ + break; + } + } + + return 1; +} + + +static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, + struct net_device *sb_dev) +{ + /* This helper function exists to help dev_pick_tx get the correct + * destination queue. Using a helper function skips a call to + * skb_tx_hash and will put the skbs in the queue we expect on their + * way down to the bonding driver. + */ + u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; + + /* Save the original txq to restore before passing to the driver */ + qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); + + if (unlikely(txq >= dev->real_num_tx_queues)) { + do { + txq -= dev->real_num_tx_queues; + } while (txq >= dev->real_num_tx_queues); + } + return txq; +} + +static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, + struct sk_buff *skb, + bool all_slaves) +{ + struct bonding *bond = netdev_priv(master_dev); + struct bond_up_slave *slaves; + struct slave *slave = NULL; + + switch (BOND_MODE(bond)) { + case BOND_MODE_ROUNDROBIN: + slave = bond_xmit_roundrobin_slave_get(bond, skb); + break; + case BOND_MODE_ACTIVEBACKUP: + slave = bond_xmit_activebackup_slave_get(bond, skb); + break; + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + if (all_slaves) + slaves = rcu_dereference(bond->all_slaves); + else + slaves = rcu_dereference(bond->usable_slaves); + slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); + break; + case BOND_MODE_BROADCAST: + break; + case BOND_MODE_ALB: + slave = bond_xmit_alb_slave_get(bond, skb); + break; + case BOND_MODE_TLB: + slave = bond_xmit_tlb_slave_get(bond, skb); + break; + default: + /* Should never happen, mode already checked */ + WARN_ONCE(true, "Unknown bonding mode"); + break; + } + + if (slave) + return slave->dev; + return NULL; +} + +static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct bonding *bond = netdev_priv(dev); + + if (bond_should_override_tx_queue(bond) && + !bond_slave_override(bond, skb)) + return NETDEV_TX_OK; + + switch (BOND_MODE(bond)) { + case BOND_MODE_ROUNDROBIN: + return bond_xmit_roundrobin(skb, dev); + case BOND_MODE_ACTIVEBACKUP: + return bond_xmit_activebackup(skb, dev); + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + return bond_3ad_xor_xmit(skb, dev); + case BOND_MODE_BROADCAST: + return bond_xmit_broadcast(skb, dev); + case BOND_MODE_ALB: + return bond_alb_xmit(skb, dev); + case BOND_MODE_TLB: + return bond_tlb_xmit(skb, dev); + default: + /* Should never happen, mode already checked */ + netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); + WARN_ON_ONCE(1); + return bond_tx_drop(dev, skb); + } +} + +static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct bonding *bond = netdev_priv(dev); + netdev_tx_t ret = NETDEV_TX_OK; + + /* If we risk deadlock from transmitting this in the + * netpoll path, tell netpoll to queue the frame for later tx + */ + if (unlikely(is_netpoll_tx_blocked(dev))) + return NETDEV_TX_BUSY; + + rcu_read_lock(); + if (bond_has_slaves(bond)) + ret = __bond_start_xmit(skb, dev); + else + ret = bond_tx_drop(dev, skb); + rcu_read_unlock(); + + return ret; +} + +static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) +{ + if (speed == 0 || speed == SPEED_UNKNOWN) + speed = slave->speed; + else + speed = min(speed, slave->speed); + + return speed; +} + +static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, + struct ethtool_link_ksettings *cmd) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct list_head *iter; + struct slave *slave; + u32 speed = 0; + + cmd->base.duplex = DUPLEX_UNKNOWN; + cmd->base.port = PORT_OTHER; + + /* Since bond_slave_can_tx returns false for all inactive or down slaves, we + * do not need to check mode. Though link speed might not represent + * the true receive or transmit bandwidth (not all modes are symmetric) + * this is an accurate maximum. + */ + bond_for_each_slave(bond, slave, iter) { + if (bond_slave_can_tx(slave)) { + if (slave->speed != SPEED_UNKNOWN) { + if (BOND_MODE(bond) == BOND_MODE_BROADCAST) + speed = bond_mode_bcast_speed(slave, + speed); + else + speed += slave->speed; + } + if (cmd->base.duplex == DUPLEX_UNKNOWN && + slave->duplex != DUPLEX_UNKNOWN) + cmd->base.duplex = slave->duplex; + } + } + cmd->base.speed = speed ? : SPEED_UNKNOWN; + + return 0; +} + +static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, + struct ethtool_drvinfo *drvinfo) +{ + strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); + snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", + BOND_ABI_VERSION); +} + +static const struct ethtool_ops bond_ethtool_ops = { + .get_drvinfo = bond_ethtool_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_link_ksettings = bond_ethtool_get_link_ksettings, +}; + +static const struct net_device_ops bond_netdev_ops = { + .ndo_init = bond_init, + .ndo_uninit = bond_uninit, + .ndo_open = bond_open, + .ndo_stop = bond_close, + .ndo_start_xmit = bond_start_xmit, + .ndo_select_queue = bond_select_queue, + .ndo_get_stats64 = bond_get_stats, + .ndo_do_ioctl = bond_do_ioctl, + .ndo_change_rx_flags = bond_change_rx_flags, + .ndo_set_rx_mode = bond_set_rx_mode, + .ndo_change_mtu = bond_change_mtu, + .ndo_set_mac_address = bond_set_mac_address, + .ndo_neigh_setup = bond_neigh_setup, + .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_netpoll_setup = bond_netpoll_setup, + .ndo_netpoll_cleanup = bond_netpoll_cleanup, + .ndo_poll_controller = bond_poll_controller, +#endif + .ndo_add_slave = bond_enslave, + .ndo_del_slave = bond_release, + .ndo_fix_features = bond_fix_features, + .ndo_features_check = passthru_features_check, + .ndo_get_xmit_slave = bond_xmit_get_slave, +}; + +static const struct device_type bond_type = { + .name = "bond", +}; + +static void bond_destructor(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + if (bond->wq) + destroy_workqueue(bond->wq); +} + +void bond_setup(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + + spin_lock_init(&bond->mode_lock); + bond->params = bonding_defaults; + + /* Initialize pointers */ + bond->dev = bond_dev; + + /* Initialize the device entry points */ + ether_setup(bond_dev); + bond_dev->max_mtu = ETH_MAX_MTU; + bond_dev->netdev_ops = &bond_netdev_ops; + bond_dev->ethtool_ops = &bond_ethtool_ops; + + bond_dev->needs_free_netdev = true; + bond_dev->priv_destructor = bond_destructor; + + SET_NETDEV_DEVTYPE(bond_dev, &bond_type); + + /* Initialize the device options */ + bond_dev->flags |= IFF_MASTER; + bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; + bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); + +#ifdef CONFIG_XFRM_OFFLOAD + /* set up xfrm device ops (only supported in active-backup right now) */ + bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; + INIT_LIST_HEAD(&bond->ipsec_list); + spin_lock_init(&bond->ipsec_lock); +#endif /* CONFIG_XFRM_OFFLOAD */ + + /* don't acquire bond device's netif_tx_lock when transmitting */ + bond_dev->features |= NETIF_F_LLTX; + + /* By default, we declare the bond to be fully + * VLAN hardware accelerated capable. Special + * care is taken in the various xmit functions + * when there are slaves that are not hw accel + * capable + */ + + /* Don't allow bond devices to change network namespaces. */ + bond_dev->features |= NETIF_F_NETNS_LOCAL; + + bond_dev->hw_features = BOND_VLAN_FEATURES | + NETIF_F_HW_VLAN_CTAG_RX | + NETIF_F_HW_VLAN_CTAG_FILTER | + NETIF_F_HW_VLAN_STAG_RX | + NETIF_F_HW_VLAN_STAG_FILTER; + + bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4; +#ifdef CONFIG_XFRM_OFFLOAD + bond_dev->hw_features |= BOND_XFRM_FEATURES; +#endif /* CONFIG_XFRM_OFFLOAD */ + bond_dev->features |= bond_dev->hw_features; + bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; +#ifdef CONFIG_XFRM_OFFLOAD + /* Disable XFRM features if this isn't an active-backup config */ + if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) + bond_dev->features &= ~BOND_XFRM_FEATURES; +#endif /* CONFIG_XFRM_OFFLOAD */ +} + +/* Destroy a bonding device. + * Must be under rtnl_lock when this function is called. + */ +static void bond_uninit(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct bond_up_slave *usable, *all; + struct list_head *iter; + struct slave *slave; + + bond_netpoll_cleanup(bond_dev); + + /* Release the bonded slaves */ + bond_for_each_slave(bond, slave, iter) + __bond_release_one(bond_dev, slave->dev, true, true); + netdev_info(bond_dev, "Released all slaves\n"); + + usable = rtnl_dereference(bond->usable_slaves); + if (usable) { + RCU_INIT_POINTER(bond->usable_slaves, NULL); + kfree_rcu(usable, rcu); + } + + all = rtnl_dereference(bond->all_slaves); + if (all) { + RCU_INIT_POINTER(bond->all_slaves, NULL); + kfree_rcu(all, rcu); + } + + list_del(&bond->bond_list); + + bond_debug_unregister(bond); +} + +/*------------------------- Module initialization ---------------------------*/ + +static int bond_check_params(struct bond_params *params) +{ + int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; + struct bond_opt_value newval; + const struct bond_opt_value *valptr; + int arp_all_targets_value = 0; + u16 ad_actor_sys_prio = 0; + u16 ad_user_port_key = 0; + __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; + int arp_ip_count; + int bond_mode = BOND_MODE_ROUNDROBIN; + int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; + int lacp_fast = 0; + int tlb_dynamic_lb; + + /* Convert string parameters. */ + if (mode) { + bond_opt_initstr(&newval, mode); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); + if (!valptr) { + pr_err("Error: Invalid bonding mode \"%s\"\n", mode); + return -EINVAL; + } + bond_mode = valptr->value; + } + + if (xmit_hash_policy) { + if (bond_mode == BOND_MODE_ROUNDROBIN || + bond_mode == BOND_MODE_ACTIVEBACKUP || + bond_mode == BOND_MODE_BROADCAST) { + pr_info("xmit_hash_policy param is irrelevant in mode %s\n", + bond_mode_name(bond_mode)); + } else { + bond_opt_initstr(&newval, xmit_hash_policy); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), + &newval); + if (!valptr) { + pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", + xmit_hash_policy); + return -EINVAL; + } + xmit_hashtype = valptr->value; + } + } + + if (lacp_rate) { + if (bond_mode != BOND_MODE_8023AD) { + pr_info("lacp_rate param is irrelevant in mode %s\n", + bond_mode_name(bond_mode)); + } else { + bond_opt_initstr(&newval, lacp_rate); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), + &newval); + if (!valptr) { + pr_err("Error: Invalid lacp rate \"%s\"\n", + lacp_rate); + return -EINVAL; + } + lacp_fast = valptr->value; + } + } + + if (ad_select) { + bond_opt_initstr(&newval, ad_select); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), + &newval); + if (!valptr) { + pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); + return -EINVAL; + } + params->ad_select = valptr->value; + if (bond_mode != BOND_MODE_8023AD) + pr_warn("ad_select param only affects 802.3ad mode\n"); + } else { + params->ad_select = BOND_AD_STABLE; + } + + if (max_bonds < 0) { + pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", + max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); + max_bonds = BOND_DEFAULT_MAX_BONDS; + } + + if (miimon < 0) { + pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", + miimon, INT_MAX); + miimon = 0; + } + + if (updelay < 0) { + pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", + updelay, INT_MAX); + updelay = 0; + } + + if (downdelay < 0) { + pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", + downdelay, INT_MAX); + downdelay = 0; + } + + if ((use_carrier != 0) && (use_carrier != 1)) { + pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", + use_carrier); + use_carrier = 1; + } + + if (num_peer_notif < 0 || num_peer_notif > 255) { + pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", + num_peer_notif); + num_peer_notif = 1; + } + + /* reset values for 802.3ad/TLB/ALB */ + if (!bond_mode_uses_arp(bond_mode)) { + if (!miimon) { + pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n"); + pr_warn("Forcing miimon to 100msec\n"); + miimon = BOND_DEFAULT_MIIMON; + } + } + + if (tx_queues < 1 || tx_queues > 255) { + pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", + tx_queues, BOND_DEFAULT_TX_QUEUES); + tx_queues = BOND_DEFAULT_TX_QUEUES; + } + + if ((all_slaves_active != 0) && (all_slaves_active != 1)) { + pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", + all_slaves_active); + all_slaves_active = 0; + } + + if (resend_igmp < 0 || resend_igmp > 255) { + pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", + resend_igmp, BOND_DEFAULT_RESEND_IGMP); + resend_igmp = BOND_DEFAULT_RESEND_IGMP; + } + + bond_opt_initval(&newval, packets_per_slave); + if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { + pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", + packets_per_slave, USHRT_MAX); + packets_per_slave = 1; + } + + if (bond_mode == BOND_MODE_ALB) { + pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n", + updelay); + } + + if (!miimon) { + if (updelay || downdelay) { + /* just warn the user the up/down delay will have + * no effect since miimon is zero... + */ + pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n", + updelay, downdelay); + } + } else { + /* don't allow arp monitoring */ + if (arp_interval) { + pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", + miimon, arp_interval); + arp_interval = 0; + } + + if ((updelay % miimon) != 0) { + pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", + updelay, miimon, (updelay / miimon) * miimon); + } + + updelay /= miimon; + + if ((downdelay % miimon) != 0) { + pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", + downdelay, miimon, + (downdelay / miimon) * miimon); + } + + downdelay /= miimon; + } + + if (arp_interval < 0) { + pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", + arp_interval, INT_MAX); + arp_interval = 0; + } + + for (arp_ip_count = 0, i = 0; + (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { + __be32 ip; + + /* not a complete check, but good enough to catch mistakes */ + if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || + !bond_is_ip_target_ok(ip)) { + pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", + arp_ip_target[i]); + arp_interval = 0; + } else { + if (bond_get_targets_ip(arp_target, ip) == -1) + arp_target[arp_ip_count++] = ip; + else + pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", + &ip); + } + } + + if (arp_interval && !arp_ip_count) { + /* don't allow arping if no arp_ip_target given... */ + pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", + arp_interval); + arp_interval = 0; + } + + if (arp_validate) { + if (!arp_interval) { + pr_err("arp_validate requires arp_interval\n"); + return -EINVAL; + } + + bond_opt_initstr(&newval, arp_validate); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), + &newval); + if (!valptr) { + pr_err("Error: invalid arp_validate \"%s\"\n", + arp_validate); + return -EINVAL; + } + arp_validate_value = valptr->value; + } else { + arp_validate_value = 0; + } + + if (arp_all_targets) { + bond_opt_initstr(&newval, arp_all_targets); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), + &newval); + if (!valptr) { + pr_err("Error: invalid arp_all_targets_value \"%s\"\n", + arp_all_targets); + arp_all_targets_value = 0; + } else { + arp_all_targets_value = valptr->value; + } + } + + if (miimon) { + pr_info("MII link monitoring set to %d ms\n", miimon); + } else if (arp_interval) { + valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, + arp_validate_value); + pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", + arp_interval, valptr->string, arp_ip_count); + + for (i = 0; i < arp_ip_count; i++) + pr_cont(" %s", arp_ip_target[i]); + + pr_cont("\n"); + + } else if (max_bonds) { + /* miimon and arp_interval not set, we need one so things + * work as expected, see bonding.txt for details + */ + pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n"); + } + + if (primary && !bond_mode_uses_primary(bond_mode)) { + /* currently, using a primary only makes sense + * in active backup, TLB or ALB modes + */ + pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", + primary, bond_mode_name(bond_mode)); + primary = NULL; + } + + if (primary && primary_reselect) { + bond_opt_initstr(&newval, primary_reselect); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), + &newval); + if (!valptr) { + pr_err("Error: Invalid primary_reselect \"%s\"\n", + primary_reselect); + return -EINVAL; + } + primary_reselect_value = valptr->value; + } else { + primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; + } + + if (fail_over_mac) { + bond_opt_initstr(&newval, fail_over_mac); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), + &newval); + if (!valptr) { + pr_err("Error: invalid fail_over_mac \"%s\"\n", + fail_over_mac); + return -EINVAL; + } + fail_over_mac_value = valptr->value; + if (bond_mode != BOND_MODE_ACTIVEBACKUP) + pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); + } else { + fail_over_mac_value = BOND_FOM_NONE; + } + + bond_opt_initstr(&newval, "default"); + valptr = bond_opt_parse( + bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), + &newval); + if (!valptr) { + pr_err("Error: No ad_actor_sys_prio default value"); + return -EINVAL; + } + ad_actor_sys_prio = valptr->value; + + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), + &newval); + if (!valptr) { + pr_err("Error: No ad_user_port_key default value"); + return -EINVAL; + } + ad_user_port_key = valptr->value; + + bond_opt_initstr(&newval, "default"); + valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); + if (!valptr) { + pr_err("Error: No tlb_dynamic_lb default value"); + return -EINVAL; + } + tlb_dynamic_lb = valptr->value; + + if (lp_interval == 0) { + pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", + INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); + lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; + } + + /* fill params struct with the proper values */ + params->mode = bond_mode; + params->xmit_policy = xmit_hashtype; + params->miimon = miimon; + params->num_peer_notif = num_peer_notif; + params->arp_interval = arp_interval; + params->arp_validate = arp_validate_value; + params->arp_all_targets = arp_all_targets_value; + params->updelay = updelay; + params->downdelay = downdelay; + params->peer_notif_delay = 0; + params->use_carrier = use_carrier; + params->lacp_fast = lacp_fast; + params->primary[0] = 0; + params->primary_reselect = primary_reselect_value; + params->fail_over_mac = fail_over_mac_value; + params->tx_queues = tx_queues; + params->all_slaves_active = all_slaves_active; + params->resend_igmp = resend_igmp; + params->min_links = min_links; + params->lp_interval = lp_interval; + params->packets_per_slave = packets_per_slave; + params->tlb_dynamic_lb = tlb_dynamic_lb; + params->ad_actor_sys_prio = ad_actor_sys_prio; + eth_zero_addr(params->ad_actor_system); + params->ad_user_port_key = ad_user_port_key; + if (packets_per_slave > 0) { + params->reciprocal_packets_per_slave = + reciprocal_value(packets_per_slave); + } else { + /* reciprocal_packets_per_slave is unused if + * packets_per_slave is 0 or 1, just initialize it + */ + params->reciprocal_packets_per_slave = + (struct reciprocal_value) { 0 }; + } + + if (primary) { + strncpy(params->primary, primary, IFNAMSIZ); + params->primary[IFNAMSIZ - 1] = 0; + } + + memcpy(params->arp_targets, arp_target, sizeof(arp_target)); + + return 0; +} + +/* Called from registration process */ +static int bond_init(struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); + + netdev_dbg(bond_dev, "Begin bond_init\n"); + + bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); + if (!bond->wq) + return -ENOMEM; + + bond->notifier_ctx = false; + + spin_lock_init(&bond->stats_lock); + netdev_lockdep_set_classes(bond_dev); + + list_add_tail(&bond->bond_list, &bn->dev_list); + + bond_prepare_sysfs_group(bond); + + bond_debug_register(bond); + + /* Ensure valid dev_addr */ + if (is_zero_ether_addr(bond_dev->dev_addr) && + bond_dev->addr_assign_type == NET_ADDR_PERM) + eth_hw_addr_random(bond_dev); + + return 0; +} + +unsigned int bond_get_num_tx_queues(void) +{ + return tx_queues; +} + +/* Create a new bond based on the specified name and bonding parameters. + * If name is NULL, obtain a suitable "bond%d" name for us. + * Caller must NOT hold rtnl_lock; we need to release it here before we + * set up our sysfs entries. + */ +int bond_create(struct net *net, const char *name) +{ + struct net_device *bond_dev; + struct bonding *bond; + struct alb_bond_info *bond_info; + int res; + + rtnl_lock(); + + bond_dev = alloc_netdev_mq(sizeof(struct bonding), + name ? name : "bond%d", NET_NAME_UNKNOWN, + bond_setup, tx_queues); + if (!bond_dev) { + pr_err("%s: eek! can't alloc netdev!\n", name); + rtnl_unlock(); + return -ENOMEM; + } + + /* + * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. + * It is set to 0 by default which is wrong. + */ + bond = netdev_priv(bond_dev); + bond_info = &(BOND_ALB_INFO(bond)); + bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; + + dev_net_set(bond_dev, net); + bond_dev->rtnl_link_ops = &bond_link_ops; + + res = register_netdevice(bond_dev); + if (res < 0) { + free_netdev(bond_dev); + rtnl_unlock(); + + return res; + } + + netif_carrier_off(bond_dev); + + bond_work_init_all(bond); + + rtnl_unlock(); + return 0; +} + +static int __net_init bond_net_init(struct net *net) +{ + struct bond_net *bn = net_generic(net, bond_net_id); + + bn->net = net; + INIT_LIST_HEAD(&bn->dev_list); + + bond_create_proc_dir(bn); + bond_create_sysfs(bn); + + return 0; +} + +static void __net_exit bond_net_exit(struct net *net) +{ + struct bond_net *bn = net_generic(net, bond_net_id); + struct bonding *bond, *tmp_bond; + LIST_HEAD(list); + + bond_destroy_sysfs(bn); + + /* Kill off any bonds created after unregistering bond rtnl ops */ + rtnl_lock(); + list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) + unregister_netdevice_queue(bond->dev, &list); + unregister_netdevice_many(&list); + rtnl_unlock(); + + bond_destroy_proc_dir(bn); +} + +static struct pernet_operations bond_net_ops = { + .init = bond_net_init, + .exit = bond_net_exit, + .id = &bond_net_id, + .size = sizeof(struct bond_net), +}; + +static int __init bonding_init(void) +{ + int i; + int res; + + res = bond_check_params(&bonding_defaults); + if (res) + goto out; + + res = register_pernet_subsys(&bond_net_ops); + if (res) + goto out; + + res = bond_netlink_init(); + if (res) + goto err_link; + + bond_create_debugfs(); + + for (i = 0; i < max_bonds; i++) { + res = bond_create(&init_net, NULL); + if (res) + goto err; + } + + skb_flow_dissector_init(&flow_keys_bonding, + flow_keys_bonding_keys, + ARRAY_SIZE(flow_keys_bonding_keys)); + + register_netdevice_notifier(&bond_netdev_notifier); +out: + return res; +err: + bond_destroy_debugfs(); + bond_netlink_fini(); +err_link: + unregister_pernet_subsys(&bond_net_ops); + goto out; + +} + +static void __exit bonding_exit(void) +{ + unregister_netdevice_notifier(&bond_netdev_notifier); + + bond_destroy_debugfs(); + + bond_netlink_fini(); + unregister_pernet_subsys(&bond_net_ops); + +#ifdef CONFIG_NET_POLL_CONTROLLER + /* Make sure we don't have an imbalance on our netpoll blocking */ + WARN_ON(atomic_read(&netpoll_block_tx)); +#endif +} + +module_init(bonding_init); +module_exit(bonding_exit); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRV_DESCRIPTION); +MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c new file mode 100644 index 000000000..f0f9138e9 --- /dev/null +++ b/drivers/net/bonding/bond_netlink.c @@ -0,0 +1,785 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * drivers/net/bond/bond_netlink.c - Netlink interface for bonding + * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us> + * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com> + */ + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/if_link.h> +#include <linux/if_ether.h> +#include <net/netlink.h> +#include <net/rtnetlink.h> +#include <net/bonding.h> + +static size_t bond_get_slave_size(const struct net_device *bond_dev, + const struct net_device *slave_dev) +{ + return nla_total_size(sizeof(u8)) + /* IFLA_BOND_SLAVE_STATE */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_SLAVE_MII_STATUS */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_SLAVE_LINK_FAILURE_COUNT */ + nla_total_size(MAX_ADDR_LEN) + /* IFLA_BOND_SLAVE_PERM_HWADDR */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_SLAVE_QUEUE_ID */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_SLAVE_AD_AGGREGATOR_ID */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE */ + 0; +} + +static int bond_fill_slave_info(struct sk_buff *skb, + const struct net_device *bond_dev, + const struct net_device *slave_dev) +{ + struct slave *slave = bond_slave_get_rtnl(slave_dev); + + if (nla_put_u8(skb, IFLA_BOND_SLAVE_STATE, bond_slave_state(slave))) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_SLAVE_MII_STATUS, slave->link)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_SLAVE_LINK_FAILURE_COUNT, + slave->link_failure_count)) + goto nla_put_failure; + + if (nla_put(skb, IFLA_BOND_SLAVE_PERM_HWADDR, + slave_dev->addr_len, slave->perm_hwaddr)) + goto nla_put_failure; + + if (nla_put_u16(skb, IFLA_BOND_SLAVE_QUEUE_ID, slave->queue_id)) + goto nla_put_failure; + + if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) { + const struct aggregator *agg; + const struct port *ad_port; + + ad_port = &SLAVE_AD_INFO(slave)->port; + agg = SLAVE_AD_INFO(slave)->port.aggregator; + if (agg) { + if (nla_put_u16(skb, IFLA_BOND_SLAVE_AD_AGGREGATOR_ID, + agg->aggregator_identifier)) + goto nla_put_failure; + if (nla_put_u8(skb, + IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE, + ad_port->actor_oper_port_state)) + goto nla_put_failure; + if (nla_put_u16(skb, + IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE, + ad_port->partner_oper.port_state)) + goto nla_put_failure; + } + } + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = { + [IFLA_BOND_MODE] = { .type = NLA_U8 }, + [IFLA_BOND_ACTIVE_SLAVE] = { .type = NLA_U32 }, + [IFLA_BOND_MIIMON] = { .type = NLA_U32 }, + [IFLA_BOND_UPDELAY] = { .type = NLA_U32 }, + [IFLA_BOND_DOWNDELAY] = { .type = NLA_U32 }, + [IFLA_BOND_USE_CARRIER] = { .type = NLA_U8 }, + [IFLA_BOND_ARP_INTERVAL] = { .type = NLA_U32 }, + [IFLA_BOND_ARP_IP_TARGET] = { .type = NLA_NESTED }, + [IFLA_BOND_ARP_VALIDATE] = { .type = NLA_U32 }, + [IFLA_BOND_ARP_ALL_TARGETS] = { .type = NLA_U32 }, + [IFLA_BOND_PRIMARY] = { .type = NLA_U32 }, + [IFLA_BOND_PRIMARY_RESELECT] = { .type = NLA_U8 }, + [IFLA_BOND_FAIL_OVER_MAC] = { .type = NLA_U8 }, + [IFLA_BOND_XMIT_HASH_POLICY] = { .type = NLA_U8 }, + [IFLA_BOND_RESEND_IGMP] = { .type = NLA_U32 }, + [IFLA_BOND_NUM_PEER_NOTIF] = { .type = NLA_U8 }, + [IFLA_BOND_ALL_SLAVES_ACTIVE] = { .type = NLA_U8 }, + [IFLA_BOND_MIN_LINKS] = { .type = NLA_U32 }, + [IFLA_BOND_LP_INTERVAL] = { .type = NLA_U32 }, + [IFLA_BOND_PACKETS_PER_SLAVE] = { .type = NLA_U32 }, + [IFLA_BOND_AD_LACP_RATE] = { .type = NLA_U8 }, + [IFLA_BOND_AD_SELECT] = { .type = NLA_U8 }, + [IFLA_BOND_AD_INFO] = { .type = NLA_NESTED }, + [IFLA_BOND_AD_ACTOR_SYS_PRIO] = { .type = NLA_U16 }, + [IFLA_BOND_AD_USER_PORT_KEY] = { .type = NLA_U16 }, + [IFLA_BOND_AD_ACTOR_SYSTEM] = { .type = NLA_BINARY, + .len = ETH_ALEN }, + [IFLA_BOND_TLB_DYNAMIC_LB] = { .type = NLA_U8 }, + [IFLA_BOND_PEER_NOTIF_DELAY] = { .type = NLA_U32 }, +}; + +static const struct nla_policy bond_slave_policy[IFLA_BOND_SLAVE_MAX + 1] = { + [IFLA_BOND_SLAVE_QUEUE_ID] = { .type = NLA_U16 }, +}; + +static int bond_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) + return -EINVAL; + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) + return -EADDRNOTAVAIL; + } + return 0; +} + +static int bond_slave_changelink(struct net_device *bond_dev, + struct net_device *slave_dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct bond_opt_value newval; + int err; + + if (!data) + return 0; + + if (data[IFLA_BOND_SLAVE_QUEUE_ID]) { + u16 queue_id = nla_get_u16(data[IFLA_BOND_SLAVE_QUEUE_ID]); + char queue_id_str[IFNAMSIZ + 7]; + + /* queue_id option setting expects slave_name:queue_id */ + snprintf(queue_id_str, sizeof(queue_id_str), "%s:%u\n", + slave_dev->name, queue_id); + bond_opt_initstr(&newval, queue_id_str); + err = __bond_opt_set(bond, BOND_OPT_QUEUE_ID, &newval); + if (err) + return err; + } + + return 0; +} + +static int bond_changelink(struct net_device *bond_dev, struct nlattr *tb[], + struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct bond_opt_value newval; + int miimon = 0; + int err; + + if (!data) + return 0; + + if (data[IFLA_BOND_MODE]) { + int mode = nla_get_u8(data[IFLA_BOND_MODE]); + + bond_opt_initval(&newval, mode); + err = __bond_opt_set(bond, BOND_OPT_MODE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_ACTIVE_SLAVE]) { + int ifindex = nla_get_u32(data[IFLA_BOND_ACTIVE_SLAVE]); + struct net_device *slave_dev; + char *active_slave = ""; + + if (ifindex != 0) { + slave_dev = __dev_get_by_index(dev_net(bond_dev), + ifindex); + if (!slave_dev) + return -ENODEV; + active_slave = slave_dev->name; + } + bond_opt_initstr(&newval, active_slave); + err = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_MIIMON]) { + miimon = nla_get_u32(data[IFLA_BOND_MIIMON]); + + bond_opt_initval(&newval, miimon); + err = __bond_opt_set(bond, BOND_OPT_MIIMON, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_UPDELAY]) { + int updelay = nla_get_u32(data[IFLA_BOND_UPDELAY]); + + bond_opt_initval(&newval, updelay); + err = __bond_opt_set(bond, BOND_OPT_UPDELAY, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_DOWNDELAY]) { + int downdelay = nla_get_u32(data[IFLA_BOND_DOWNDELAY]); + + bond_opt_initval(&newval, downdelay); + err = __bond_opt_set(bond, BOND_OPT_DOWNDELAY, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_PEER_NOTIF_DELAY]) { + int delay = nla_get_u32(data[IFLA_BOND_PEER_NOTIF_DELAY]); + + bond_opt_initval(&newval, delay); + err = __bond_opt_set(bond, BOND_OPT_PEER_NOTIF_DELAY, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_USE_CARRIER]) { + int use_carrier = nla_get_u8(data[IFLA_BOND_USE_CARRIER]); + + bond_opt_initval(&newval, use_carrier); + err = __bond_opt_set(bond, BOND_OPT_USE_CARRIER, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_ARP_INTERVAL]) { + int arp_interval = nla_get_u32(data[IFLA_BOND_ARP_INTERVAL]); + + if (arp_interval && miimon) { + netdev_err(bond->dev, "ARP monitoring cannot be used with MII monitoring\n"); + return -EINVAL; + } + + bond_opt_initval(&newval, arp_interval); + err = __bond_opt_set(bond, BOND_OPT_ARP_INTERVAL, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_ARP_IP_TARGET]) { + struct nlattr *attr; + int i = 0, rem; + + bond_option_arp_ip_targets_clear(bond); + nla_for_each_nested(attr, data[IFLA_BOND_ARP_IP_TARGET], rem) { + __be32 target; + + if (nla_len(attr) < sizeof(target)) + return -EINVAL; + + target = nla_get_be32(attr); + + bond_opt_initval(&newval, (__force u64)target); + err = __bond_opt_set(bond, BOND_OPT_ARP_TARGETS, + &newval); + if (err) + break; + i++; + } + if (i == 0 && bond->params.arp_interval) + netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n"); + if (err) + return err; + } + if (data[IFLA_BOND_ARP_VALIDATE]) { + int arp_validate = nla_get_u32(data[IFLA_BOND_ARP_VALIDATE]); + + if (arp_validate && miimon) { + netdev_err(bond->dev, "ARP validating cannot be used with MII monitoring\n"); + return -EINVAL; + } + + bond_opt_initval(&newval, arp_validate); + err = __bond_opt_set(bond, BOND_OPT_ARP_VALIDATE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_ARP_ALL_TARGETS]) { + int arp_all_targets = + nla_get_u32(data[IFLA_BOND_ARP_ALL_TARGETS]); + + bond_opt_initval(&newval, arp_all_targets); + err = __bond_opt_set(bond, BOND_OPT_ARP_ALL_TARGETS, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_PRIMARY]) { + int ifindex = nla_get_u32(data[IFLA_BOND_PRIMARY]); + struct net_device *dev; + char *primary = ""; + + dev = __dev_get_by_index(dev_net(bond_dev), ifindex); + if (dev) + primary = dev->name; + + bond_opt_initstr(&newval, primary); + err = __bond_opt_set(bond, BOND_OPT_PRIMARY, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_PRIMARY_RESELECT]) { + int primary_reselect = + nla_get_u8(data[IFLA_BOND_PRIMARY_RESELECT]); + + bond_opt_initval(&newval, primary_reselect); + err = __bond_opt_set(bond, BOND_OPT_PRIMARY_RESELECT, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_FAIL_OVER_MAC]) { + int fail_over_mac = + nla_get_u8(data[IFLA_BOND_FAIL_OVER_MAC]); + + bond_opt_initval(&newval, fail_over_mac); + err = __bond_opt_set(bond, BOND_OPT_FAIL_OVER_MAC, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_XMIT_HASH_POLICY]) { + int xmit_hash_policy = + nla_get_u8(data[IFLA_BOND_XMIT_HASH_POLICY]); + + bond_opt_initval(&newval, xmit_hash_policy); + err = __bond_opt_set(bond, BOND_OPT_XMIT_HASH, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_RESEND_IGMP]) { + int resend_igmp = + nla_get_u32(data[IFLA_BOND_RESEND_IGMP]); + + bond_opt_initval(&newval, resend_igmp); + err = __bond_opt_set(bond, BOND_OPT_RESEND_IGMP, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_NUM_PEER_NOTIF]) { + int num_peer_notif = + nla_get_u8(data[IFLA_BOND_NUM_PEER_NOTIF]); + + bond_opt_initval(&newval, num_peer_notif); + err = __bond_opt_set(bond, BOND_OPT_NUM_PEER_NOTIF, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_ALL_SLAVES_ACTIVE]) { + int all_slaves_active = + nla_get_u8(data[IFLA_BOND_ALL_SLAVES_ACTIVE]); + + bond_opt_initval(&newval, all_slaves_active); + err = __bond_opt_set(bond, BOND_OPT_ALL_SLAVES_ACTIVE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_MIN_LINKS]) { + int min_links = + nla_get_u32(data[IFLA_BOND_MIN_LINKS]); + + bond_opt_initval(&newval, min_links); + err = __bond_opt_set(bond, BOND_OPT_MINLINKS, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_LP_INTERVAL]) { + int lp_interval = + nla_get_u32(data[IFLA_BOND_LP_INTERVAL]); + + bond_opt_initval(&newval, lp_interval); + err = __bond_opt_set(bond, BOND_OPT_LP_INTERVAL, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_PACKETS_PER_SLAVE]) { + int packets_per_slave = + nla_get_u32(data[IFLA_BOND_PACKETS_PER_SLAVE]); + + bond_opt_initval(&newval, packets_per_slave); + err = __bond_opt_set(bond, BOND_OPT_PACKETS_PER_SLAVE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_AD_LACP_RATE]) { + int lacp_rate = + nla_get_u8(data[IFLA_BOND_AD_LACP_RATE]); + + bond_opt_initval(&newval, lacp_rate); + err = __bond_opt_set(bond, BOND_OPT_LACP_RATE, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_AD_SELECT]) { + int ad_select = + nla_get_u8(data[IFLA_BOND_AD_SELECT]); + + bond_opt_initval(&newval, ad_select); + err = __bond_opt_set(bond, BOND_OPT_AD_SELECT, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_AD_ACTOR_SYS_PRIO]) { + int actor_sys_prio = + nla_get_u16(data[IFLA_BOND_AD_ACTOR_SYS_PRIO]); + + bond_opt_initval(&newval, actor_sys_prio); + err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYS_PRIO, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_AD_USER_PORT_KEY]) { + int port_key = + nla_get_u16(data[IFLA_BOND_AD_USER_PORT_KEY]); + + bond_opt_initval(&newval, port_key); + err = __bond_opt_set(bond, BOND_OPT_AD_USER_PORT_KEY, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_AD_ACTOR_SYSTEM]) { + if (nla_len(data[IFLA_BOND_AD_ACTOR_SYSTEM]) != ETH_ALEN) + return -EINVAL; + + bond_opt_initval(&newval, + nla_get_u64(data[IFLA_BOND_AD_ACTOR_SYSTEM])); + err = __bond_opt_set(bond, BOND_OPT_AD_ACTOR_SYSTEM, &newval); + if (err) + return err; + } + if (data[IFLA_BOND_TLB_DYNAMIC_LB]) { + int dynamic_lb = nla_get_u8(data[IFLA_BOND_TLB_DYNAMIC_LB]); + + bond_opt_initval(&newval, dynamic_lb); + err = __bond_opt_set(bond, BOND_OPT_TLB_DYNAMIC_LB, &newval); + if (err) + return err; + } + + return 0; +} + +static int bond_newlink(struct net *src_net, struct net_device *bond_dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + int err; + + err = bond_changelink(bond_dev, tb, data, extack); + if (err < 0) + return err; + + err = register_netdevice(bond_dev); + if (!err) { + struct bonding *bond = netdev_priv(bond_dev); + + netif_carrier_off(bond_dev); + bond_work_init_all(bond); + } + + return err; +} + +static size_t bond_get_size(const struct net_device *bond_dev) +{ + return nla_total_size(sizeof(u8)) + /* IFLA_BOND_MODE */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_ACTIVE_SLAVE */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_MIIMON */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_UPDELAY */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_DOWNDELAY */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_USE_CARRIER */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_ARP_INTERVAL */ + /* IFLA_BOND_ARP_IP_TARGET */ + nla_total_size(sizeof(struct nlattr)) + + nla_total_size(sizeof(u32)) * BOND_MAX_ARP_TARGETS + + nla_total_size(sizeof(u32)) + /* IFLA_BOND_ARP_VALIDATE */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_ARP_ALL_TARGETS */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_PRIMARY */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_PRIMARY_RESELECT */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_FAIL_OVER_MAC */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_XMIT_HASH_POLICY */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_RESEND_IGMP */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_NUM_PEER_NOTIF */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_ALL_SLAVES_ACTIVE */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_MIN_LINKS */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_LP_INTERVAL */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_PACKETS_PER_SLAVE */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_AD_LACP_RATE */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_AD_SELECT */ + nla_total_size(sizeof(struct nlattr)) + /* IFLA_BOND_AD_INFO */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_INFO_AGGREGATOR */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_INFO_NUM_PORTS */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_INFO_ACTOR_KEY */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_INFO_PARTNER_KEY*/ + nla_total_size(ETH_ALEN) + /* IFLA_BOND_AD_INFO_PARTNER_MAC*/ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_ACTOR_SYS_PRIO */ + nla_total_size(sizeof(u16)) + /* IFLA_BOND_AD_USER_PORT_KEY */ + nla_total_size(ETH_ALEN) + /* IFLA_BOND_AD_ACTOR_SYSTEM */ + nla_total_size(sizeof(u8)) + /* IFLA_BOND_TLB_DYNAMIC_LB */ + nla_total_size(sizeof(u32)) + /* IFLA_BOND_PEER_NOTIF_DELAY */ + 0; +} + +static int bond_option_active_slave_get_ifindex(struct bonding *bond) +{ + const struct net_device *slave; + int ifindex; + + rcu_read_lock(); + slave = bond_option_active_slave_get_rcu(bond); + ifindex = slave ? slave->ifindex : 0; + rcu_read_unlock(); + return ifindex; +} + +static int bond_fill_info(struct sk_buff *skb, + const struct net_device *bond_dev) +{ + struct bonding *bond = netdev_priv(bond_dev); + unsigned int packets_per_slave; + int ifindex, i, targets_added; + struct nlattr *targets; + struct slave *primary; + + if (nla_put_u8(skb, IFLA_BOND_MODE, BOND_MODE(bond))) + goto nla_put_failure; + + ifindex = bond_option_active_slave_get_ifindex(bond); + if (ifindex && nla_put_u32(skb, IFLA_BOND_ACTIVE_SLAVE, ifindex)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_MIIMON, bond->params.miimon)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_UPDELAY, + bond->params.updelay * bond->params.miimon)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_DOWNDELAY, + bond->params.downdelay * bond->params.miimon)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_PEER_NOTIF_DELAY, + bond->params.peer_notif_delay * bond->params.miimon)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_USE_CARRIER, bond->params.use_carrier)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_ARP_INTERVAL, bond->params.arp_interval)) + goto nla_put_failure; + + targets = nla_nest_start_noflag(skb, IFLA_BOND_ARP_IP_TARGET); + if (!targets) + goto nla_put_failure; + + targets_added = 0; + for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) { + if (bond->params.arp_targets[i]) { + if (nla_put_be32(skb, i, bond->params.arp_targets[i])) + goto nla_put_failure; + targets_added = 1; + } + } + + if (targets_added) + nla_nest_end(skb, targets); + else + nla_nest_cancel(skb, targets); + + if (nla_put_u32(skb, IFLA_BOND_ARP_VALIDATE, bond->params.arp_validate)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_ARP_ALL_TARGETS, + bond->params.arp_all_targets)) + goto nla_put_failure; + + primary = rtnl_dereference(bond->primary_slave); + if (primary && + nla_put_u32(skb, IFLA_BOND_PRIMARY, primary->dev->ifindex)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_PRIMARY_RESELECT, + bond->params.primary_reselect)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_FAIL_OVER_MAC, + bond->params.fail_over_mac)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_XMIT_HASH_POLICY, + bond->params.xmit_policy)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_RESEND_IGMP, + bond->params.resend_igmp)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_NUM_PEER_NOTIF, + bond->params.num_peer_notif)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_ALL_SLAVES_ACTIVE, + bond->params.all_slaves_active)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_MIN_LINKS, + bond->params.min_links)) + goto nla_put_failure; + + if (nla_put_u32(skb, IFLA_BOND_LP_INTERVAL, + bond->params.lp_interval)) + goto nla_put_failure; + + packets_per_slave = bond->params.packets_per_slave; + if (nla_put_u32(skb, IFLA_BOND_PACKETS_PER_SLAVE, + packets_per_slave)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_AD_LACP_RATE, + bond->params.lacp_fast)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_AD_SELECT, + bond->params.ad_select)) + goto nla_put_failure; + + if (nla_put_u8(skb, IFLA_BOND_TLB_DYNAMIC_LB, + bond->params.tlb_dynamic_lb)) + goto nla_put_failure; + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct ad_info info; + + if (capable(CAP_NET_ADMIN)) { + if (nla_put_u16(skb, IFLA_BOND_AD_ACTOR_SYS_PRIO, + bond->params.ad_actor_sys_prio)) + goto nla_put_failure; + + if (nla_put_u16(skb, IFLA_BOND_AD_USER_PORT_KEY, + bond->params.ad_user_port_key)) + goto nla_put_failure; + + if (nla_put(skb, IFLA_BOND_AD_ACTOR_SYSTEM, + ETH_ALEN, &bond->params.ad_actor_system)) + goto nla_put_failure; + } + if (!bond_3ad_get_active_agg_info(bond, &info)) { + struct nlattr *nest; + + nest = nla_nest_start_noflag(skb, IFLA_BOND_AD_INFO); + if (!nest) + goto nla_put_failure; + + if (nla_put_u16(skb, IFLA_BOND_AD_INFO_AGGREGATOR, + info.aggregator_id)) + goto nla_put_failure; + if (nla_put_u16(skb, IFLA_BOND_AD_INFO_NUM_PORTS, + info.ports)) + goto nla_put_failure; + if (nla_put_u16(skb, IFLA_BOND_AD_INFO_ACTOR_KEY, + info.actor_key)) + goto nla_put_failure; + if (nla_put_u16(skb, IFLA_BOND_AD_INFO_PARTNER_KEY, + info.partner_key)) + goto nla_put_failure; + if (nla_put(skb, IFLA_BOND_AD_INFO_PARTNER_MAC, + sizeof(info.partner_system), + &info.partner_system)) + goto nla_put_failure; + + nla_nest_end(skb, nest); + } + } + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static size_t bond_get_linkxstats_size(const struct net_device *dev, int attr) +{ + switch (attr) { + case IFLA_STATS_LINK_XSTATS: + case IFLA_STATS_LINK_XSTATS_SLAVE: + break; + default: + return 0; + } + + return bond_3ad_stats_size() + nla_total_size(0); +} + +static int bond_fill_linkxstats(struct sk_buff *skb, + const struct net_device *dev, + int *prividx, int attr) +{ + struct nlattr *nla __maybe_unused; + struct slave *slave = NULL; + struct nlattr *nest, *nest2; + struct bonding *bond; + + switch (attr) { + case IFLA_STATS_LINK_XSTATS: + bond = netdev_priv(dev); + break; + case IFLA_STATS_LINK_XSTATS_SLAVE: + slave = bond_slave_get_rtnl(dev); + if (!slave) + return 0; + bond = slave->bond; + break; + default: + return -EINVAL; + } + + nest = nla_nest_start_noflag(skb, LINK_XSTATS_TYPE_BOND); + if (!nest) + return -EMSGSIZE; + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct bond_3ad_stats *stats; + + if (slave) + stats = &SLAVE_AD_INFO(slave)->stats; + else + stats = &BOND_AD_INFO(bond).stats; + + nest2 = nla_nest_start_noflag(skb, BOND_XSTATS_3AD); + if (!nest2) { + nla_nest_end(skb, nest); + return -EMSGSIZE; + } + + if (bond_3ad_stats_fill(skb, stats)) { + nla_nest_cancel(skb, nest2); + nla_nest_end(skb, nest); + return -EMSGSIZE; + } + nla_nest_end(skb, nest2); + } + nla_nest_end(skb, nest); + + return 0; +} + +struct rtnl_link_ops bond_link_ops __read_mostly = { + .kind = "bond", + .priv_size = sizeof(struct bonding), + .setup = bond_setup, + .maxtype = IFLA_BOND_MAX, + .policy = bond_policy, + .validate = bond_validate, + .newlink = bond_newlink, + .changelink = bond_changelink, + .get_size = bond_get_size, + .fill_info = bond_fill_info, + .get_num_tx_queues = bond_get_num_tx_queues, + .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number + as for TX queues */ + .fill_linkxstats = bond_fill_linkxstats, + .get_linkxstats_size = bond_get_linkxstats_size, + .slave_maxtype = IFLA_BOND_SLAVE_MAX, + .slave_policy = bond_slave_policy, + .slave_changelink = bond_slave_changelink, + .get_slave_size = bond_get_slave_size, + .fill_slave_info = bond_fill_slave_info, +}; + +int __init bond_netlink_init(void) +{ + return rtnl_link_register(&bond_link_ops); +} + +void bond_netlink_fini(void) +{ + rtnl_link_unregister(&bond_link_ops); +} + +MODULE_ALIAS_RTNL_LINK("bond"); diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c new file mode 100644 index 000000000..fe55c8160 --- /dev/null +++ b/drivers/net/bonding/bond_options.c @@ -0,0 +1,1491 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * drivers/net/bond/bond_options.c - bonding options + * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us> + * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com> + */ + +#include <linux/errno.h> +#include <linux/if.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/rcupdate.h> +#include <linux/ctype.h> +#include <linux/inet.h> +#include <linux/sched/signal.h> + +#include <net/bonding.h> + +static int bond_option_active_slave_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_miimon_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_updelay_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_downdelay_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_peer_notif_delay_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_use_carrier_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_arp_interval_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target); +static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target); +static int bond_option_arp_ip_targets_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_arp_validate_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_arp_all_targets_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_primary_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_primary_reselect_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_fail_over_mac_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_xmit_hash_policy_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_resend_igmp_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_num_peer_notif_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_all_slaves_active_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_min_links_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_lp_interval_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_pps_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_lacp_rate_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_ad_select_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_queue_id_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_mode_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_slaves_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_tlb_dynamic_lb_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_ad_actor_sys_prio_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_ad_actor_system_set(struct bonding *bond, + const struct bond_opt_value *newval); +static int bond_option_ad_user_port_key_set(struct bonding *bond, + const struct bond_opt_value *newval); + + +static const struct bond_opt_value bond_mode_tbl[] = { + { "balance-rr", BOND_MODE_ROUNDROBIN, BOND_VALFLAG_DEFAULT}, + { "active-backup", BOND_MODE_ACTIVEBACKUP, 0}, + { "balance-xor", BOND_MODE_XOR, 0}, + { "broadcast", BOND_MODE_BROADCAST, 0}, + { "802.3ad", BOND_MODE_8023AD, 0}, + { "balance-tlb", BOND_MODE_TLB, 0}, + { "balance-alb", BOND_MODE_ALB, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_pps_tbl[] = { + { "default", 1, BOND_VALFLAG_DEFAULT}, + { "maxval", USHRT_MAX, BOND_VALFLAG_MAX}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_xmit_hashtype_tbl[] = { + { "layer2", BOND_XMIT_POLICY_LAYER2, BOND_VALFLAG_DEFAULT}, + { "layer3+4", BOND_XMIT_POLICY_LAYER34, 0}, + { "layer2+3", BOND_XMIT_POLICY_LAYER23, 0}, + { "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0}, + { "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_arp_validate_tbl[] = { + { "none", BOND_ARP_VALIDATE_NONE, BOND_VALFLAG_DEFAULT}, + { "active", BOND_ARP_VALIDATE_ACTIVE, 0}, + { "backup", BOND_ARP_VALIDATE_BACKUP, 0}, + { "all", BOND_ARP_VALIDATE_ALL, 0}, + { "filter", BOND_ARP_FILTER, 0}, + { "filter_active", BOND_ARP_FILTER_ACTIVE, 0}, + { "filter_backup", BOND_ARP_FILTER_BACKUP, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_arp_all_targets_tbl[] = { + { "any", BOND_ARP_TARGETS_ANY, BOND_VALFLAG_DEFAULT}, + { "all", BOND_ARP_TARGETS_ALL, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_fail_over_mac_tbl[] = { + { "none", BOND_FOM_NONE, BOND_VALFLAG_DEFAULT}, + { "active", BOND_FOM_ACTIVE, 0}, + { "follow", BOND_FOM_FOLLOW, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_intmax_tbl[] = { + { "off", 0, BOND_VALFLAG_DEFAULT}, + { "maxval", INT_MAX, BOND_VALFLAG_MAX}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_lacp_rate_tbl[] = { + { "slow", AD_LACP_SLOW, 0}, + { "fast", AD_LACP_FAST, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_ad_select_tbl[] = { + { "stable", BOND_AD_STABLE, BOND_VALFLAG_DEFAULT}, + { "bandwidth", BOND_AD_BANDWIDTH, 0}, + { "count", BOND_AD_COUNT, 0}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_num_peer_notif_tbl[] = { + { "off", 0, 0}, + { "maxval", 255, BOND_VALFLAG_MAX}, + { "default", 1, BOND_VALFLAG_DEFAULT}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_primary_reselect_tbl[] = { + { "always", BOND_PRI_RESELECT_ALWAYS, BOND_VALFLAG_DEFAULT}, + { "better", BOND_PRI_RESELECT_BETTER, 0}, + { "failure", BOND_PRI_RESELECT_FAILURE, 0}, + { NULL, -1}, +}; + +static const struct bond_opt_value bond_use_carrier_tbl[] = { + { "off", 0, 0}, + { "on", 1, BOND_VALFLAG_DEFAULT}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_all_slaves_active_tbl[] = { + { "off", 0, BOND_VALFLAG_DEFAULT}, + { "on", 1, 0}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_resend_igmp_tbl[] = { + { "off", 0, 0}, + { "maxval", 255, BOND_VALFLAG_MAX}, + { "default", 1, BOND_VALFLAG_DEFAULT}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_lp_interval_tbl[] = { + { "minval", 1, BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT}, + { "maxval", INT_MAX, BOND_VALFLAG_MAX}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_tlb_dynamic_lb_tbl[] = { + { "off", 0, 0}, + { "on", 1, BOND_VALFLAG_DEFAULT}, + { NULL, -1, 0} +}; + +static const struct bond_opt_value bond_ad_actor_sys_prio_tbl[] = { + { "minval", 1, BOND_VALFLAG_MIN}, + { "maxval", 65535, BOND_VALFLAG_MAX | BOND_VALFLAG_DEFAULT}, + { NULL, -1, 0}, +}; + +static const struct bond_opt_value bond_ad_user_port_key_tbl[] = { + { "minval", 0, BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT}, + { "maxval", 1023, BOND_VALFLAG_MAX}, + { NULL, -1, 0}, +}; + +static const struct bond_option bond_opts[BOND_OPT_LAST] = { + [BOND_OPT_MODE] = { + .id = BOND_OPT_MODE, + .name = "mode", + .desc = "bond device mode", + .flags = BOND_OPTFLAG_NOSLAVES | BOND_OPTFLAG_IFDOWN, + .values = bond_mode_tbl, + .set = bond_option_mode_set + }, + [BOND_OPT_PACKETS_PER_SLAVE] = { + .id = BOND_OPT_PACKETS_PER_SLAVE, + .name = "packets_per_slave", + .desc = "Packets to send per slave in RR mode", + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ROUNDROBIN)), + .values = bond_pps_tbl, + .set = bond_option_pps_set + }, + [BOND_OPT_XMIT_HASH] = { + .id = BOND_OPT_XMIT_HASH, + .name = "xmit_hash_policy", + .desc = "balance-xor, 802.3ad, and tlb hashing method", + .values = bond_xmit_hashtype_tbl, + .set = bond_option_xmit_hash_policy_set + }, + [BOND_OPT_ARP_VALIDATE] = { + .id = BOND_OPT_ARP_VALIDATE, + .name = "arp_validate", + .desc = "validate src/dst of ARP probes", + .unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) | + BIT(BOND_MODE_ALB), + .values = bond_arp_validate_tbl, + .set = bond_option_arp_validate_set + }, + [BOND_OPT_ARP_ALL_TARGETS] = { + .id = BOND_OPT_ARP_ALL_TARGETS, + .name = "arp_all_targets", + .desc = "fail on any/all arp targets timeout", + .values = bond_arp_all_targets_tbl, + .set = bond_option_arp_all_targets_set + }, + [BOND_OPT_FAIL_OVER_MAC] = { + .id = BOND_OPT_FAIL_OVER_MAC, + .name = "fail_over_mac", + .desc = "For active-backup, do not set all slaves to the same MAC", + .flags = BOND_OPTFLAG_NOSLAVES, + .values = bond_fail_over_mac_tbl, + .set = bond_option_fail_over_mac_set + }, + [BOND_OPT_ARP_INTERVAL] = { + .id = BOND_OPT_ARP_INTERVAL, + .name = "arp_interval", + .desc = "arp interval in milliseconds", + .unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) | + BIT(BOND_MODE_ALB), + .values = bond_intmax_tbl, + .set = bond_option_arp_interval_set + }, + [BOND_OPT_ARP_TARGETS] = { + .id = BOND_OPT_ARP_TARGETS, + .name = "arp_ip_target", + .desc = "arp targets in n.n.n.n form", + .flags = BOND_OPTFLAG_RAWVAL, + .set = bond_option_arp_ip_targets_set + }, + [BOND_OPT_DOWNDELAY] = { + .id = BOND_OPT_DOWNDELAY, + .name = "downdelay", + .desc = "Delay before considering link down, in milliseconds", + .values = bond_intmax_tbl, + .set = bond_option_downdelay_set + }, + [BOND_OPT_UPDELAY] = { + .id = BOND_OPT_UPDELAY, + .name = "updelay", + .desc = "Delay before considering link up, in milliseconds", + .values = bond_intmax_tbl, + .set = bond_option_updelay_set + }, + [BOND_OPT_LACP_RATE] = { + .id = BOND_OPT_LACP_RATE, + .name = "lacp_rate", + .desc = "LACPDU tx rate to request from 802.3ad partner", + .flags = BOND_OPTFLAG_IFDOWN, + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)), + .values = bond_lacp_rate_tbl, + .set = bond_option_lacp_rate_set + }, + [BOND_OPT_MINLINKS] = { + .id = BOND_OPT_MINLINKS, + .name = "min_links", + .desc = "Minimum number of available links before turning on carrier", + .values = bond_intmax_tbl, + .set = bond_option_min_links_set + }, + [BOND_OPT_AD_SELECT] = { + .id = BOND_OPT_AD_SELECT, + .name = "ad_select", + .desc = "803.ad aggregation selection logic", + .flags = BOND_OPTFLAG_IFDOWN, + .values = bond_ad_select_tbl, + .set = bond_option_ad_select_set + }, + [BOND_OPT_NUM_PEER_NOTIF] = { + .id = BOND_OPT_NUM_PEER_NOTIF, + .name = "num_unsol_na", + .desc = "Number of peer notifications to send on failover event", + .values = bond_num_peer_notif_tbl, + .set = bond_option_num_peer_notif_set + }, + [BOND_OPT_MIIMON] = { + .id = BOND_OPT_MIIMON, + .name = "miimon", + .desc = "Link check interval in milliseconds", + .values = bond_intmax_tbl, + .set = bond_option_miimon_set + }, + [BOND_OPT_PRIMARY] = { + .id = BOND_OPT_PRIMARY, + .name = "primary", + .desc = "Primary network device to use", + .flags = BOND_OPTFLAG_RAWVAL, + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) | + BIT(BOND_MODE_TLB) | + BIT(BOND_MODE_ALB)), + .set = bond_option_primary_set + }, + [BOND_OPT_PRIMARY_RESELECT] = { + .id = BOND_OPT_PRIMARY_RESELECT, + .name = "primary_reselect", + .desc = "Reselect primary slave once it comes up", + .values = bond_primary_reselect_tbl, + .set = bond_option_primary_reselect_set + }, + [BOND_OPT_USE_CARRIER] = { + .id = BOND_OPT_USE_CARRIER, + .name = "use_carrier", + .desc = "Use netif_carrier_ok (vs MII ioctls) in miimon", + .values = bond_use_carrier_tbl, + .set = bond_option_use_carrier_set + }, + [BOND_OPT_ACTIVE_SLAVE] = { + .id = BOND_OPT_ACTIVE_SLAVE, + .name = "active_slave", + .desc = "Currently active slave", + .flags = BOND_OPTFLAG_RAWVAL, + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) | + BIT(BOND_MODE_TLB) | + BIT(BOND_MODE_ALB)), + .set = bond_option_active_slave_set + }, + [BOND_OPT_QUEUE_ID] = { + .id = BOND_OPT_QUEUE_ID, + .name = "queue_id", + .desc = "Set queue id of a slave", + .flags = BOND_OPTFLAG_RAWVAL, + .set = bond_option_queue_id_set + }, + [BOND_OPT_ALL_SLAVES_ACTIVE] = { + .id = BOND_OPT_ALL_SLAVES_ACTIVE, + .name = "all_slaves_active", + .desc = "Keep all frames received on an interface by setting active flag for all slaves", + .values = bond_all_slaves_active_tbl, + .set = bond_option_all_slaves_active_set + }, + [BOND_OPT_RESEND_IGMP] = { + .id = BOND_OPT_RESEND_IGMP, + .name = "resend_igmp", + .desc = "Number of IGMP membership reports to send on link failure", + .values = bond_resend_igmp_tbl, + .set = bond_option_resend_igmp_set + }, + [BOND_OPT_LP_INTERVAL] = { + .id = BOND_OPT_LP_INTERVAL, + .name = "lp_interval", + .desc = "The number of seconds between instances where the bonding driver sends learning packets to each slave's peer switch", + .values = bond_lp_interval_tbl, + .set = bond_option_lp_interval_set + }, + [BOND_OPT_SLAVES] = { + .id = BOND_OPT_SLAVES, + .name = "slaves", + .desc = "Slave membership management", + .flags = BOND_OPTFLAG_RAWVAL, + .set = bond_option_slaves_set + }, + [BOND_OPT_TLB_DYNAMIC_LB] = { + .id = BOND_OPT_TLB_DYNAMIC_LB, + .name = "tlb_dynamic_lb", + .desc = "Enable dynamic flow shuffling", + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB) | BIT(BOND_MODE_ALB)), + .values = bond_tlb_dynamic_lb_tbl, + .flags = BOND_OPTFLAG_IFDOWN, + .set = bond_option_tlb_dynamic_lb_set, + }, + [BOND_OPT_AD_ACTOR_SYS_PRIO] = { + .id = BOND_OPT_AD_ACTOR_SYS_PRIO, + .name = "ad_actor_sys_prio", + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)), + .values = bond_ad_actor_sys_prio_tbl, + .set = bond_option_ad_actor_sys_prio_set, + }, + [BOND_OPT_AD_ACTOR_SYSTEM] = { + .id = BOND_OPT_AD_ACTOR_SYSTEM, + .name = "ad_actor_system", + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)), + .flags = BOND_OPTFLAG_RAWVAL, + .set = bond_option_ad_actor_system_set, + }, + [BOND_OPT_AD_USER_PORT_KEY] = { + .id = BOND_OPT_AD_USER_PORT_KEY, + .name = "ad_user_port_key", + .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)), + .flags = BOND_OPTFLAG_IFDOWN, + .values = bond_ad_user_port_key_tbl, + .set = bond_option_ad_user_port_key_set, + }, + [BOND_OPT_NUM_PEER_NOTIF_ALIAS] = { + .id = BOND_OPT_NUM_PEER_NOTIF_ALIAS, + .name = "num_grat_arp", + .desc = "Number of peer notifications to send on failover event", + .values = bond_num_peer_notif_tbl, + .set = bond_option_num_peer_notif_set + }, + [BOND_OPT_PEER_NOTIF_DELAY] = { + .id = BOND_OPT_PEER_NOTIF_DELAY, + .name = "peer_notif_delay", + .desc = "Delay between each peer notification on failover event, in milliseconds", + .values = bond_intmax_tbl, + .set = bond_option_peer_notif_delay_set + } +}; + +/* Searches for an option by name */ +const struct bond_option *bond_opt_get_by_name(const char *name) +{ + const struct bond_option *opt; + int option; + + for (option = 0; option < BOND_OPT_LAST; option++) { + opt = bond_opt_get(option); + if (opt && !strcmp(opt->name, name)) + return opt; + } + + return NULL; +} + +/* Searches for a value in opt's values[] table */ +const struct bond_opt_value *bond_opt_get_val(unsigned int option, u64 val) +{ + const struct bond_option *opt; + int i; + + opt = bond_opt_get(option); + if (WARN_ON(!opt)) + return NULL; + for (i = 0; opt->values && opt->values[i].string; i++) + if (opt->values[i].value == val) + return &opt->values[i]; + + return NULL; +} + +/* Searches for a value in opt's values[] table which matches the flagmask */ +static const struct bond_opt_value *bond_opt_get_flags(const struct bond_option *opt, + u32 flagmask) +{ + int i; + + for (i = 0; opt->values && opt->values[i].string; i++) + if (opt->values[i].flags & flagmask) + return &opt->values[i]; + + return NULL; +} + +/* If maxval is missing then there's no range to check. In case minval is + * missing then it's considered to be 0. + */ +static bool bond_opt_check_range(const struct bond_option *opt, u64 val) +{ + const struct bond_opt_value *minval, *maxval; + + minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN); + maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX); + if (!maxval || (minval && val < minval->value) || val > maxval->value) + return false; + + return true; +} + +/** + * bond_opt_parse - parse option value + * @opt: the option to parse against + * @val: value to parse + * + * This function tries to extract the value from @val and check if it's + * a possible match for the option and returns NULL if a match isn't found, + * or the struct_opt_value that matched. It also strips the new line from + * @val->string if it's present. + */ +const struct bond_opt_value *bond_opt_parse(const struct bond_option *opt, + struct bond_opt_value *val) +{ + char *p, valstr[BOND_OPT_MAX_NAMELEN + 1] = { 0, }; + const struct bond_opt_value *tbl; + const struct bond_opt_value *ret = NULL; + bool checkval; + int i, rv; + + /* No parsing if the option wants a raw val */ + if (opt->flags & BOND_OPTFLAG_RAWVAL) + return val; + + tbl = opt->values; + if (!tbl) + goto out; + + /* ULLONG_MAX is used to bypass string processing */ + checkval = val->value != ULLONG_MAX; + if (!checkval) { + if (!val->string) + goto out; + p = strchr(val->string, '\n'); + if (p) + *p = '\0'; + for (p = val->string; *p; p++) + if (!(isdigit(*p) || isspace(*p))) + break; + /* The following code extracts the string to match or the value + * and sets checkval appropriately + */ + if (*p) { + rv = sscanf(val->string, "%32s", valstr); + } else { + rv = sscanf(val->string, "%llu", &val->value); + checkval = true; + } + if (!rv) + goto out; + } + + for (i = 0; tbl[i].string; i++) { + /* Check for exact match */ + if (checkval) { + if (val->value == tbl[i].value) + ret = &tbl[i]; + } else { + if (!strcmp(valstr, "default") && + (tbl[i].flags & BOND_VALFLAG_DEFAULT)) + ret = &tbl[i]; + + if (!strcmp(valstr, tbl[i].string)) + ret = &tbl[i]; + } + /* Found an exact match */ + if (ret) + goto out; + } + /* Possible range match */ + if (checkval && bond_opt_check_range(opt, val->value)) + ret = val; +out: + return ret; +} + +/* Check opt's dependencies against bond mode and currently set options */ +static int bond_opt_check_deps(struct bonding *bond, + const struct bond_option *opt) +{ + struct bond_params *params = &bond->params; + + if (test_bit(params->mode, &opt->unsuppmodes)) + return -EACCES; + if ((opt->flags & BOND_OPTFLAG_NOSLAVES) && bond_has_slaves(bond)) + return -ENOTEMPTY; + if ((opt->flags & BOND_OPTFLAG_IFDOWN) && (bond->dev->flags & IFF_UP)) + return -EBUSY; + + return 0; +} + +static void bond_opt_dep_print(struct bonding *bond, + const struct bond_option *opt) +{ + const struct bond_opt_value *modeval; + struct bond_params *params; + + params = &bond->params; + modeval = bond_opt_get_val(BOND_OPT_MODE, params->mode); + if (test_bit(params->mode, &opt->unsuppmodes)) + netdev_err(bond->dev, "option %s: mode dependency failed, not supported in mode %s(%llu)\n", + opt->name, modeval->string, modeval->value); +} + +static void bond_opt_error_interpret(struct bonding *bond, + const struct bond_option *opt, + int error, const struct bond_opt_value *val) +{ + const struct bond_opt_value *minval, *maxval; + char *p; + + switch (error) { + case -EINVAL: + if (val) { + if (val->string) { + /* sometimes RAWVAL opts may have new lines */ + p = strchr(val->string, '\n'); + if (p) + *p = '\0'; + netdev_err(bond->dev, "option %s: invalid value (%s)\n", + opt->name, val->string); + } else { + netdev_err(bond->dev, "option %s: invalid value (%llu)\n", + opt->name, val->value); + } + } + minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN); + maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX); + if (!maxval) + break; + netdev_err(bond->dev, "option %s: allowed values %llu - %llu\n", + opt->name, minval ? minval->value : 0, maxval->value); + break; + case -EACCES: + bond_opt_dep_print(bond, opt); + break; + case -ENOTEMPTY: + netdev_err(bond->dev, "option %s: unable to set because the bond device has slaves\n", + opt->name); + break; + case -EBUSY: + netdev_err(bond->dev, "option %s: unable to set because the bond device is up\n", + opt->name); + break; + default: + break; + } +} + +/** + * __bond_opt_set - set a bonding option + * @bond: target bond device + * @option: option to set + * @val: value to set it to + * + * This function is used to change the bond's option value, it can be + * used for both enabling/changing an option and for disabling it. RTNL lock + * must be obtained before calling this function. + */ +int __bond_opt_set(struct bonding *bond, + unsigned int option, struct bond_opt_value *val) +{ + const struct bond_opt_value *retval = NULL; + const struct bond_option *opt; + int ret = -ENOENT; + + ASSERT_RTNL(); + + opt = bond_opt_get(option); + if (WARN_ON(!val) || WARN_ON(!opt)) + goto out; + ret = bond_opt_check_deps(bond, opt); + if (ret) + goto out; + retval = bond_opt_parse(opt, val); + if (!retval) { + ret = -EINVAL; + goto out; + } + ret = opt->set(bond, retval); +out: + if (ret) + bond_opt_error_interpret(bond, opt, ret, val); + + return ret; +} +/** + * __bond_opt_set_notify - set a bonding option + * @bond: target bond device + * @option: option to set + * @val: value to set it to + * + * This function is used to change the bond's option value and trigger + * a notification to user sapce. It can be used for both enabling/changing + * an option and for disabling it. RTNL lock must be obtained before calling + * this function. + */ +int __bond_opt_set_notify(struct bonding *bond, + unsigned int option, struct bond_opt_value *val) +{ + int ret = -ENOENT; + + ASSERT_RTNL(); + + ret = __bond_opt_set(bond, option, val); + + if (!ret && (bond->dev->reg_state == NETREG_REGISTERED)) + call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev); + + return ret; +} + +/** + * bond_opt_tryset_rtnl - try to acquire rtnl and call __bond_opt_set + * @bond: target bond device + * @option: option to set + * @buf: value to set it to + * + * This function tries to acquire RTNL without blocking and if successful + * calls __bond_opt_set. It is mainly used for sysfs option manipulation. + */ +int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf) +{ + struct bond_opt_value optval; + int ret; + + if (!rtnl_trylock()) + return restart_syscall(); + bond_opt_initstr(&optval, buf); + ret = __bond_opt_set_notify(bond, option, &optval); + rtnl_unlock(); + + return ret; +} + +/** + * bond_opt_get - get a pointer to an option + * @option: option for which to return a pointer + * + * This function checks if option is valid and if so returns a pointer + * to its entry in the bond_opts[] option array. + */ +const struct bond_option *bond_opt_get(unsigned int option) +{ + if (!BOND_OPT_VALID(option)) + return NULL; + + return &bond_opts[option]; +} + +static void bond_set_xfrm_features(struct net_device *bond_dev, u64 mode) +{ + if (!IS_ENABLED(CONFIG_XFRM_OFFLOAD)) + return; + + if (mode == BOND_MODE_ACTIVEBACKUP) + bond_dev->wanted_features |= BOND_XFRM_FEATURES; + else + bond_dev->wanted_features &= ~BOND_XFRM_FEATURES; + + netdev_update_features(bond_dev); +} + +static int bond_option_mode_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + if (!bond_mode_uses_arp(newval->value)) { + if (bond->params.arp_interval) { + netdev_dbg(bond->dev, "%s mode is incompatible with arp monitoring, start mii monitoring\n", + newval->string); + /* disable arp monitoring */ + bond->params.arp_interval = 0; + } + + if (!bond->params.miimon) { + /* set miimon to default value */ + bond->params.miimon = BOND_DEFAULT_MIIMON; + netdev_dbg(bond->dev, "Setting MII monitoring interval to %d\n", + bond->params.miimon); + } + } + + if (newval->value == BOND_MODE_ALB) + bond->params.tlb_dynamic_lb = 1; + + if (bond->dev->reg_state == NETREG_REGISTERED) + bond_set_xfrm_features(bond->dev, newval->value); + + /* don't cache arp_validate between modes */ + bond->params.arp_validate = BOND_ARP_VALIDATE_NONE; + bond->params.mode = newval->value; + + return 0; +} + +static int bond_option_active_slave_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + char ifname[IFNAMSIZ] = { 0, }; + struct net_device *slave_dev; + int ret = 0; + + sscanf(newval->string, "%15s", ifname); /* IFNAMSIZ */ + if (!strlen(ifname) || newval->string[0] == '\n') { + slave_dev = NULL; + } else { + slave_dev = __dev_get_by_name(dev_net(bond->dev), ifname); + if (!slave_dev) + return -ENODEV; + } + + if (slave_dev) { + if (!netif_is_bond_slave(slave_dev)) { + slave_err(bond->dev, slave_dev, "Device is not bonding slave\n"); + return -EINVAL; + } + + if (bond->dev != netdev_master_upper_dev_get(slave_dev)) { + slave_err(bond->dev, slave_dev, "Device is not our slave\n"); + return -EINVAL; + } + } + + block_netpoll_tx(); + /* check to see if we are clearing active */ + if (!slave_dev) { + netdev_dbg(bond->dev, "Clearing current active slave\n"); + RCU_INIT_POINTER(bond->curr_active_slave, NULL); + bond_select_active_slave(bond); + } else { + struct slave *old_active = rtnl_dereference(bond->curr_active_slave); + struct slave *new_active = bond_slave_get_rtnl(slave_dev); + + BUG_ON(!new_active); + + if (new_active == old_active) { + /* do nothing */ + slave_dbg(bond->dev, new_active->dev, "is already the current active slave\n"); + } else { + if (old_active && (new_active->link == BOND_LINK_UP) && + bond_slave_is_up(new_active)) { + slave_dbg(bond->dev, new_active->dev, "Setting as active slave\n"); + bond_change_active_slave(bond, new_active); + } else { + slave_err(bond->dev, new_active->dev, "Could not set as active slave; either %s is down or the link is down\n", + new_active->dev->name); + ret = -EINVAL; + } + } + } + unblock_netpoll_tx(); + + return ret; +} + +/* There are two tricky bits here. First, if MII monitoring is activated, then + * we must disable ARP monitoring. Second, if the timer isn't running, we must + * start it. + */ +static int bond_option_miimon_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting MII monitoring interval to %llu\n", + newval->value); + bond->params.miimon = newval->value; + if (bond->params.updelay) + netdev_dbg(bond->dev, "Note: Updating updelay (to %d) since it is a multiple of the miimon value\n", + bond->params.updelay * bond->params.miimon); + if (bond->params.downdelay) + netdev_dbg(bond->dev, "Note: Updating downdelay (to %d) since it is a multiple of the miimon value\n", + bond->params.downdelay * bond->params.miimon); + if (bond->params.peer_notif_delay) + netdev_dbg(bond->dev, "Note: Updating peer_notif_delay (to %d) since it is a multiple of the miimon value\n", + bond->params.peer_notif_delay * bond->params.miimon); + if (newval->value && bond->params.arp_interval) { + netdev_dbg(bond->dev, "MII monitoring cannot be used with ARP monitoring - disabling ARP monitoring...\n"); + bond->params.arp_interval = 0; + if (bond->params.arp_validate) + bond->params.arp_validate = BOND_ARP_VALIDATE_NONE; + } + if (bond->dev->flags & IFF_UP) { + /* If the interface is up, we may need to fire off + * the MII timer. If the interface is down, the + * timer will get fired off when the open function + * is called. + */ + if (!newval->value) { + cancel_delayed_work_sync(&bond->mii_work); + } else { + cancel_delayed_work_sync(&bond->arp_work); + queue_delayed_work(bond->wq, &bond->mii_work, 0); + } + } + + return 0; +} + +/* Set up, down and peer notification delays. These must be multiples + * of the MII monitoring value, and are stored internally as the + * multiplier. Thus, we must translate to MS for the real world. + */ +static int _bond_option_delay_set(struct bonding *bond, + const struct bond_opt_value *newval, + const char *name, + int *target) +{ + int value = newval->value; + + if (!bond->params.miimon) { + netdev_err(bond->dev, "Unable to set %s as MII monitoring is disabled\n", + name); + return -EPERM; + } + if ((value % bond->params.miimon) != 0) { + netdev_warn(bond->dev, + "%s (%d) is not a multiple of miimon (%d), value rounded to %d ms\n", + name, + value, bond->params.miimon, + (value / bond->params.miimon) * + bond->params.miimon); + } + *target = value / bond->params.miimon; + netdev_dbg(bond->dev, "Setting %s to %d\n", + name, + *target * bond->params.miimon); + + return 0; +} + +static int bond_option_updelay_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + return _bond_option_delay_set(bond, newval, "up delay", + &bond->params.updelay); +} + +static int bond_option_downdelay_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + return _bond_option_delay_set(bond, newval, "down delay", + &bond->params.downdelay); +} + +static int bond_option_peer_notif_delay_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + int ret = _bond_option_delay_set(bond, newval, + "peer notification delay", + &bond->params.peer_notif_delay); + return ret; +} + +static int bond_option_use_carrier_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting use_carrier to %llu\n", + newval->value); + bond->params.use_carrier = newval->value; + + return 0; +} + +/* There are two tricky bits here. First, if ARP monitoring is activated, then + * we must disable MII monitoring. Second, if the ARP timer isn't running, + * we must start it. + */ +static int bond_option_arp_interval_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting ARP monitoring interval to %llu\n", + newval->value); + bond->params.arp_interval = newval->value; + if (newval->value) { + if (bond->params.miimon) { + netdev_dbg(bond->dev, "ARP monitoring cannot be used with MII monitoring. Disabling MII monitoring\n"); + bond->params.miimon = 0; + } + if (!bond->params.arp_targets[0]) + netdev_dbg(bond->dev, "ARP monitoring has been set up, but no ARP targets have been specified\n"); + } + if (bond->dev->flags & IFF_UP) { + /* If the interface is up, we may need to fire off + * the ARP timer. If the interface is down, the + * timer will get fired off when the open function + * is called. + */ + if (!newval->value) { + if (bond->params.arp_validate) + bond->recv_probe = NULL; + cancel_delayed_work_sync(&bond->arp_work); + } else { + /* arp_validate can be set only in active-backup mode */ + bond->recv_probe = bond_arp_rcv; + cancel_delayed_work_sync(&bond->mii_work); + queue_delayed_work(bond->wq, &bond->arp_work, 0); + } + } + + return 0; +} + +static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot, + __be32 target, + unsigned long last_rx) +{ + __be32 *targets = bond->params.arp_targets; + struct list_head *iter; + struct slave *slave; + + if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) { + bond_for_each_slave(bond, slave, iter) + slave->target_last_arp_rx[slot] = last_rx; + targets[slot] = target; + } +} + +static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target) +{ + __be32 *targets = bond->params.arp_targets; + int ind; + + if (!bond_is_ip_target_ok(target)) { + netdev_err(bond->dev, "invalid ARP target %pI4 specified for addition\n", + &target); + return -EINVAL; + } + + if (bond_get_targets_ip(targets, target) != -1) { /* dup */ + netdev_err(bond->dev, "ARP target %pI4 is already present\n", + &target); + return -EINVAL; + } + + ind = bond_get_targets_ip(targets, 0); /* first free slot */ + if (ind == -1) { + netdev_err(bond->dev, "ARP target table is full!\n"); + return -EINVAL; + } + + netdev_dbg(bond->dev, "Adding ARP target %pI4\n", &target); + + _bond_options_arp_ip_target_set(bond, ind, target, jiffies); + + return 0; +} + +static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target) +{ + return _bond_option_arp_ip_target_add(bond, target); +} + +static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target) +{ + __be32 *targets = bond->params.arp_targets; + struct list_head *iter; + struct slave *slave; + unsigned long *targets_rx; + int ind, i; + + if (!bond_is_ip_target_ok(target)) { + netdev_err(bond->dev, "invalid ARP target %pI4 specified for removal\n", + &target); + return -EINVAL; + } + + ind = bond_get_targets_ip(targets, target); + if (ind == -1) { + netdev_err(bond->dev, "unable to remove nonexistent ARP target %pI4\n", + &target); + return -EINVAL; + } + + if (ind == 0 && !targets[1] && bond->params.arp_interval) + netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n"); + + netdev_dbg(bond->dev, "Removing ARP target %pI4\n", &target); + + bond_for_each_slave(bond, slave, iter) { + targets_rx = slave->target_last_arp_rx; + for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++) + targets_rx[i] = targets_rx[i+1]; + targets_rx[i] = 0; + } + for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++) + targets[i] = targets[i+1]; + targets[i] = 0; + + return 0; +} + +void bond_option_arp_ip_targets_clear(struct bonding *bond) +{ + int i; + + for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) + _bond_options_arp_ip_target_set(bond, i, 0, 0); +} + +static int bond_option_arp_ip_targets_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + int ret = -EPERM; + __be32 target; + + if (newval->string) { + if (!in4_pton(newval->string+1, -1, (u8 *)&target, -1, NULL)) { + netdev_err(bond->dev, "invalid ARP target %pI4 specified\n", + &target); + return ret; + } + if (newval->string[0] == '+') + ret = bond_option_arp_ip_target_add(bond, target); + else if (newval->string[0] == '-') + ret = bond_option_arp_ip_target_rem(bond, target); + else + netdev_err(bond->dev, "no command found in arp_ip_targets file - use +<addr> or -<addr>\n"); + } else { + target = newval->value; + ret = bond_option_arp_ip_target_add(bond, target); + } + + return ret; +} + +static int bond_option_arp_validate_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting arp_validate to %s (%llu)\n", + newval->string, newval->value); + bond->params.arp_validate = newval->value; + + return 0; +} + +static int bond_option_arp_all_targets_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting arp_all_targets to %s (%llu)\n", + newval->string, newval->value); + bond->params.arp_all_targets = newval->value; + + return 0; +} + +static int bond_option_primary_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + char *p, *primary = newval->string; + struct list_head *iter; + struct slave *slave; + + block_netpoll_tx(); + + p = strchr(primary, '\n'); + if (p) + *p = '\0'; + /* check to see if we are clearing primary */ + if (!strlen(primary)) { + netdev_dbg(bond->dev, "Setting primary slave to None\n"); + RCU_INIT_POINTER(bond->primary_slave, NULL); + memset(bond->params.primary, 0, sizeof(bond->params.primary)); + bond_select_active_slave(bond); + goto out; + } + + bond_for_each_slave(bond, slave, iter) { + if (strncmp(slave->dev->name, primary, IFNAMSIZ) == 0) { + slave_dbg(bond->dev, slave->dev, "Setting as primary slave\n"); + rcu_assign_pointer(bond->primary_slave, slave); + strcpy(bond->params.primary, slave->dev->name); + bond->force_primary = true; + bond_select_active_slave(bond); + goto out; + } + } + + if (rtnl_dereference(bond->primary_slave)) { + netdev_dbg(bond->dev, "Setting primary slave to None\n"); + RCU_INIT_POINTER(bond->primary_slave, NULL); + bond_select_active_slave(bond); + } + strncpy(bond->params.primary, primary, IFNAMSIZ); + bond->params.primary[IFNAMSIZ - 1] = 0; + + netdev_dbg(bond->dev, "Recording %s as primary, but it has not been enslaved yet\n", + primary); + +out: + unblock_netpoll_tx(); + + return 0; +} + +static int bond_option_primary_reselect_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting primary_reselect to %s (%llu)\n", + newval->string, newval->value); + bond->params.primary_reselect = newval->value; + + block_netpoll_tx(); + bond_select_active_slave(bond); + unblock_netpoll_tx(); + + return 0; +} + +static int bond_option_fail_over_mac_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting fail_over_mac to %s (%llu)\n", + newval->string, newval->value); + bond->params.fail_over_mac = newval->value; + + return 0; +} + +static int bond_option_xmit_hash_policy_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting xmit hash policy to %s (%llu)\n", + newval->string, newval->value); + bond->params.xmit_policy = newval->value; + + return 0; +} + +static int bond_option_resend_igmp_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting resend_igmp to %llu\n", + newval->value); + bond->params.resend_igmp = newval->value; + + return 0; +} + +static int bond_option_num_peer_notif_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + bond->params.num_peer_notif = newval->value; + + return 0; +} + +static int bond_option_all_slaves_active_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + struct list_head *iter; + struct slave *slave; + + if (newval->value == bond->params.all_slaves_active) + return 0; + bond->params.all_slaves_active = newval->value; + bond_for_each_slave(bond, slave, iter) { + if (!bond_is_active_slave(slave)) { + if (newval->value) + slave->inactive = 0; + else + slave->inactive = 1; + } + } + + return 0; +} + +static int bond_option_min_links_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting min links value to %llu\n", + newval->value); + bond->params.min_links = newval->value; + bond_set_carrier(bond); + + return 0; +} + +static int bond_option_lp_interval_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + bond->params.lp_interval = newval->value; + + return 0; +} + +static int bond_option_pps_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting packets per slave to %llu\n", + newval->value); + bond->params.packets_per_slave = newval->value; + if (newval->value > 0) { + bond->params.reciprocal_packets_per_slave = + reciprocal_value(newval->value); + } else { + /* reciprocal_packets_per_slave is unused if + * packets_per_slave is 0 or 1, just initialize it + */ + bond->params.reciprocal_packets_per_slave = + (struct reciprocal_value) { 0 }; + } + + return 0; +} + +static int bond_option_lacp_rate_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting LACP rate to %s (%llu)\n", + newval->string, newval->value); + bond->params.lacp_fast = newval->value; + bond_3ad_update_lacp_rate(bond); + + return 0; +} + +static int bond_option_ad_select_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting ad_select to %s (%llu)\n", + newval->string, newval->value); + bond->params.ad_select = newval->value; + + return 0; +} + +static int bond_option_queue_id_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + struct slave *slave, *update_slave; + struct net_device *sdev; + struct list_head *iter; + char *delim; + int ret = 0; + u16 qid; + + /* delim will point to queue id if successful */ + delim = strchr(newval->string, ':'); + if (!delim) + goto err_no_cmd; + + /* Terminate string that points to device name and bump it + * up one, so we can read the queue id there. + */ + *delim = '\0'; + if (sscanf(++delim, "%hd\n", &qid) != 1) + goto err_no_cmd; + + /* Check buffer length, valid ifname and queue id */ + if (!dev_valid_name(newval->string) || + qid > bond->dev->real_num_tx_queues) + goto err_no_cmd; + + /* Get the pointer to that interface if it exists */ + sdev = __dev_get_by_name(dev_net(bond->dev), newval->string); + if (!sdev) + goto err_no_cmd; + + /* Search for thes slave and check for duplicate qids */ + update_slave = NULL; + bond_for_each_slave(bond, slave, iter) { + if (sdev == slave->dev) + /* We don't need to check the matching + * slave for dups, since we're overwriting it + */ + update_slave = slave; + else if (qid && qid == slave->queue_id) { + goto err_no_cmd; + } + } + + if (!update_slave) + goto err_no_cmd; + + /* Actually set the qids for the slave */ + update_slave->queue_id = qid; + +out: + return ret; + +err_no_cmd: + netdev_dbg(bond->dev, "invalid input for queue_id set\n"); + ret = -EPERM; + goto out; + +} + +static int bond_option_slaves_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + char command[IFNAMSIZ + 1] = { 0, }; + struct net_device *dev; + char *ifname; + int ret; + + sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/ + ifname = command + 1; + if ((strlen(command) <= 1) || + (command[0] != '+' && command[0] != '-') || + !dev_valid_name(ifname)) + goto err_no_cmd; + + dev = __dev_get_by_name(dev_net(bond->dev), ifname); + if (!dev) { + netdev_dbg(bond->dev, "interface %s does not exist!\n", + ifname); + ret = -ENODEV; + goto out; + } + + switch (command[0]) { + case '+': + slave_dbg(bond->dev, dev, "Enslaving interface\n"); + ret = bond_enslave(bond->dev, dev, NULL); + break; + + case '-': + slave_dbg(bond->dev, dev, "Releasing interface\n"); + ret = bond_release(bond->dev, dev); + break; + + default: + /* should not run here. */ + goto err_no_cmd; + } + +out: + return ret; + +err_no_cmd: + netdev_err(bond->dev, "no command found in slaves file - use +ifname or -ifname\n"); + ret = -EPERM; + goto out; +} + +static int bond_option_tlb_dynamic_lb_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting dynamic-lb to %s (%llu)\n", + newval->string, newval->value); + bond->params.tlb_dynamic_lb = newval->value; + + return 0; +} + +static int bond_option_ad_actor_sys_prio_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting ad_actor_sys_prio to %llu\n", + newval->value); + + bond->params.ad_actor_sys_prio = newval->value; + bond_3ad_update_ad_actor_settings(bond); + + return 0; +} + +static int bond_option_ad_actor_system_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + u8 macaddr[ETH_ALEN]; + u8 *mac; + + if (newval->string) { + if (!mac_pton(newval->string, macaddr)) + goto err; + mac = macaddr; + } else { + mac = (u8 *)&newval->value; + } + + if (is_multicast_ether_addr(mac)) + goto err; + + netdev_dbg(bond->dev, "Setting ad_actor_system to %pM\n", mac); + ether_addr_copy(bond->params.ad_actor_system, mac); + bond_3ad_update_ad_actor_settings(bond); + + return 0; + +err: + netdev_err(bond->dev, "Invalid ad_actor_system MAC address.\n"); + return -EINVAL; +} + +static int bond_option_ad_user_port_key_set(struct bonding *bond, + const struct bond_opt_value *newval) +{ + netdev_dbg(bond->dev, "Setting ad_user_port_key to %llu\n", + newval->value); + + bond->params.ad_user_port_key = newval->value; + return 0; +} diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c new file mode 100644 index 000000000..fd5c9cbe4 --- /dev/null +++ b/drivers/net/bonding/bond_procfs.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/proc_fs.h> +#include <linux/export.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/bonding.h> + +#include "bonding_priv.h" + +static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + struct bonding *bond = PDE_DATA(file_inode(seq->file)); + struct list_head *iter; + struct slave *slave; + loff_t off = 0; + + rcu_read_lock(); + + if (*pos == 0) + return SEQ_START_TOKEN; + + bond_for_each_slave_rcu(bond, slave, iter) + if (++off == *pos) + return slave; + + return NULL; +} + +static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct bonding *bond = PDE_DATA(file_inode(seq->file)); + struct list_head *iter; + struct slave *slave; + bool found = false; + + ++*pos; + if (v == SEQ_START_TOKEN) + return bond_first_slave_rcu(bond); + + bond_for_each_slave_rcu(bond, slave, iter) { + if (found) + return slave; + if (slave == v) + found = true; + } + + return NULL; +} + +static void bond_info_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + rcu_read_unlock(); +} + +static void bond_info_show_master(struct seq_file *seq) +{ + struct bonding *bond = PDE_DATA(file_inode(seq->file)); + const struct bond_opt_value *optval; + struct slave *curr, *primary; + int i; + + curr = rcu_dereference(bond->curr_active_slave); + + seq_printf(seq, "Bonding Mode: %s", + bond_mode_name(BOND_MODE(bond))); + + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && + bond->params.fail_over_mac) { + optval = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC, + bond->params.fail_over_mac); + seq_printf(seq, " (fail_over_mac %s)", optval->string); + } + + seq_printf(seq, "\n"); + + if (bond_mode_uses_xmit_hash(bond)) { + optval = bond_opt_get_val(BOND_OPT_XMIT_HASH, + bond->params.xmit_policy); + seq_printf(seq, "Transmit Hash Policy: %s (%d)\n", + optval->string, bond->params.xmit_policy); + } + + if (bond_uses_primary(bond)) { + primary = rcu_dereference(bond->primary_slave); + seq_printf(seq, "Primary Slave: %s", + primary ? primary->dev->name : "None"); + if (primary) { + optval = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT, + bond->params.primary_reselect); + seq_printf(seq, " (primary_reselect %s)", + optval->string); + } + + seq_printf(seq, "\nCurrently Active Slave: %s\n", + (curr) ? curr->dev->name : "None"); + } + + seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ? + "up" : "down"); + seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon); + seq_printf(seq, "Up Delay (ms): %d\n", + bond->params.updelay * bond->params.miimon); + seq_printf(seq, "Down Delay (ms): %d\n", + bond->params.downdelay * bond->params.miimon); + seq_printf(seq, "Peer Notification Delay (ms): %d\n", + bond->params.peer_notif_delay * bond->params.miimon); + + + /* ARP information */ + if (bond->params.arp_interval > 0) { + int printed = 0; + seq_printf(seq, "ARP Polling Interval (ms): %d\n", + bond->params.arp_interval); + + seq_printf(seq, "ARP IP target/s (n.n.n.n form):"); + + for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { + if (!bond->params.arp_targets[i]) + break; + if (printed) + seq_printf(seq, ","); + seq_printf(seq, " %pI4", &bond->params.arp_targets[i]); + printed = 1; + } + seq_printf(seq, "\n"); + } + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct ad_info ad_info; + + seq_puts(seq, "\n802.3ad info\n"); + seq_printf(seq, "LACP rate: %s\n", + (bond->params.lacp_fast) ? "fast" : "slow"); + seq_printf(seq, "Min links: %d\n", bond->params.min_links); + optval = bond_opt_get_val(BOND_OPT_AD_SELECT, + bond->params.ad_select); + seq_printf(seq, "Aggregator selection policy (ad_select): %s\n", + optval->string); + if (capable(CAP_NET_ADMIN)) { + seq_printf(seq, "System priority: %d\n", + BOND_AD_INFO(bond).system.sys_priority); + seq_printf(seq, "System MAC address: %pM\n", + &BOND_AD_INFO(bond).system.sys_mac_addr); + + if (__bond_3ad_get_active_agg_info(bond, &ad_info)) { + seq_printf(seq, + "bond %s has no active aggregator\n", + bond->dev->name); + } else { + seq_printf(seq, "Active Aggregator Info:\n"); + + seq_printf(seq, "\tAggregator ID: %d\n", + ad_info.aggregator_id); + seq_printf(seq, "\tNumber of ports: %d\n", + ad_info.ports); + seq_printf(seq, "\tActor Key: %d\n", + ad_info.actor_key); + seq_printf(seq, "\tPartner Key: %d\n", + ad_info.partner_key); + seq_printf(seq, "\tPartner Mac Address: %pM\n", + ad_info.partner_system); + } + } + } +} + +static void bond_info_show_slave(struct seq_file *seq, + const struct slave *slave) +{ + struct bonding *bond = PDE_DATA(file_inode(seq->file)); + + seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name); + seq_printf(seq, "MII Status: %s\n", bond_slave_link_status(slave->link)); + if (slave->speed == SPEED_UNKNOWN) + seq_printf(seq, "Speed: %s\n", "Unknown"); + else + seq_printf(seq, "Speed: %d Mbps\n", slave->speed); + + if (slave->duplex == DUPLEX_UNKNOWN) + seq_printf(seq, "Duplex: %s\n", "Unknown"); + else + seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half"); + + seq_printf(seq, "Link Failure Count: %u\n", + slave->link_failure_count); + + seq_printf(seq, "Permanent HW addr: %*phC\n", + slave->dev->addr_len, slave->perm_hwaddr); + seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + const struct port *port = &SLAVE_AD_INFO(slave)->port; + const struct aggregator *agg = port->aggregator; + + if (agg) { + seq_printf(seq, "Aggregator ID: %d\n", + agg->aggregator_identifier); + seq_printf(seq, "Actor Churn State: %s\n", + bond_3ad_churn_desc(port->sm_churn_actor_state)); + seq_printf(seq, "Partner Churn State: %s\n", + bond_3ad_churn_desc(port->sm_churn_partner_state)); + seq_printf(seq, "Actor Churned Count: %d\n", + port->churn_actor_count); + seq_printf(seq, "Partner Churned Count: %d\n", + port->churn_partner_count); + + if (capable(CAP_NET_ADMIN)) { + seq_puts(seq, "details actor lacp pdu:\n"); + seq_printf(seq, " system priority: %d\n", + port->actor_system_priority); + seq_printf(seq, " system mac address: %pM\n", + &port->actor_system); + seq_printf(seq, " port key: %d\n", + port->actor_oper_port_key); + seq_printf(seq, " port priority: %d\n", + port->actor_port_priority); + seq_printf(seq, " port number: %d\n", + port->actor_port_number); + seq_printf(seq, " port state: %d\n", + port->actor_oper_port_state); + + seq_puts(seq, "details partner lacp pdu:\n"); + seq_printf(seq, " system priority: %d\n", + port->partner_oper.system_priority); + seq_printf(seq, " system mac address: %pM\n", + &port->partner_oper.system); + seq_printf(seq, " oper key: %d\n", + port->partner_oper.key); + seq_printf(seq, " port priority: %d\n", + port->partner_oper.port_priority); + seq_printf(seq, " port number: %d\n", + port->partner_oper.port_number); + seq_printf(seq, " port state: %d\n", + port->partner_oper.port_state); + } + } else { + seq_puts(seq, "Aggregator ID: N/A\n"); + } + } +} + +static int bond_info_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) { + seq_printf(seq, "%s\n", bond_version); + bond_info_show_master(seq); + } else + bond_info_show_slave(seq, v); + + return 0; +} + +static const struct seq_operations bond_info_seq_ops = { + .start = bond_info_seq_start, + .next = bond_info_seq_next, + .stop = bond_info_seq_stop, + .show = bond_info_seq_show, +}; + +void bond_create_proc_entry(struct bonding *bond) +{ + struct net_device *bond_dev = bond->dev; + struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); + + if (bn->proc_dir) { + bond->proc_entry = proc_create_seq_data(bond_dev->name, 0444, + bn->proc_dir, &bond_info_seq_ops, bond); + if (bond->proc_entry == NULL) + netdev_warn(bond_dev, "Cannot create /proc/net/%s/%s\n", + DRV_NAME, bond_dev->name); + else + memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ); + } +} + +void bond_remove_proc_entry(struct bonding *bond) +{ + struct net_device *bond_dev = bond->dev; + struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); + + if (bn->proc_dir && bond->proc_entry) { + remove_proc_entry(bond->proc_file_name, bn->proc_dir); + memset(bond->proc_file_name, 0, IFNAMSIZ); + bond->proc_entry = NULL; + } +} + +/* Create the bonding directory under /proc/net, if doesn't exist yet. + * Caller must hold rtnl_lock. + */ +void __net_init bond_create_proc_dir(struct bond_net *bn) +{ + if (!bn->proc_dir) { + bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net); + if (!bn->proc_dir) + pr_warn("Warning: Cannot create /proc/net/%s\n", + DRV_NAME); + } +} + +/* Destroy the bonding directory under /proc/net, if empty. + * Caller must hold rtnl_lock. + */ +void __net_exit bond_destroy_proc_dir(struct bond_net *bn) +{ + if (bn->proc_dir) { + remove_proc_entry(DRV_NAME, bn->net->proc_net); + bn->proc_dir = NULL; + } +} diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c new file mode 100644 index 000000000..2d615a936 --- /dev/null +++ b/drivers/net/bonding/bond_sysfs.c @@ -0,0 +1,816 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright(c) 2004-2005 Intel Corporation. All rights reserved. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/sched/signal.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/in.h> +#include <linux/sysfs.h> +#include <linux/ctype.h> +#include <linux/inet.h> +#include <linux/rtnetlink.h> +#include <linux/etherdevice.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <linux/nsproxy.h> + +#include <net/bonding.h> + +#define to_bond(cd) ((struct bonding *)(netdev_priv(to_net_dev(cd)))) + +/* "show" function for the bond_masters attribute. + * The class parameter is ignored. + */ +static ssize_t bonding_show_bonds(struct class *cls, + struct class_attribute *attr, + char *buf) +{ + struct bond_net *bn = + container_of(attr, struct bond_net, class_attr_bonding_masters); + int res = 0; + struct bonding *bond; + + rtnl_lock(); + + list_for_each_entry(bond, &bn->dev_list, bond_list) { + if (res > (PAGE_SIZE - IFNAMSIZ)) { + /* not enough space for another interface name */ + if ((PAGE_SIZE - res) > 10) + res = PAGE_SIZE - 10; + res += sprintf(buf + res, "++more++ "); + break; + } + res += sprintf(buf + res, "%s ", bond->dev->name); + } + if (res) + buf[res-1] = '\n'; /* eat the leftover space */ + + rtnl_unlock(); + return res; +} + +static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname) +{ + struct bonding *bond; + + list_for_each_entry(bond, &bn->dev_list, bond_list) { + if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0) + return bond->dev; + } + return NULL; +} + +/* "store" function for the bond_masters attribute. This is what + * creates and deletes entire bonds. + * + * The class parameter is ignored. + */ +static ssize_t bonding_store_bonds(struct class *cls, + struct class_attribute *attr, + const char *buffer, size_t count) +{ + struct bond_net *bn = + container_of(attr, struct bond_net, class_attr_bonding_masters); + char command[IFNAMSIZ + 1] = {0, }; + char *ifname; + int rv, res = count; + + sscanf(buffer, "%16s", command); /* IFNAMSIZ*/ + ifname = command + 1; + if ((strlen(command) <= 1) || + !dev_valid_name(ifname)) + goto err_no_cmd; + + if (command[0] == '+') { + pr_info("%s is being created...\n", ifname); + rv = bond_create(bn->net, ifname); + if (rv) { + if (rv == -EEXIST) + pr_info("%s already exists\n", ifname); + else + pr_info("%s creation failed\n", ifname); + res = rv; + } + } else if (command[0] == '-') { + struct net_device *bond_dev; + + rtnl_lock(); + bond_dev = bond_get_by_name(bn, ifname); + if (bond_dev) { + pr_info("%s is being deleted...\n", ifname); + unregister_netdevice(bond_dev); + } else { + pr_err("unable to delete non-existent %s\n", ifname); + res = -ENODEV; + } + rtnl_unlock(); + } else + goto err_no_cmd; + + /* Always return either count or an error. If you return 0, you'll + * get called forever, which is bad. + */ + return res; + +err_no_cmd: + pr_err("no command found in bonding_masters - use +ifname or -ifname\n"); + return -EPERM; +} + +/* class attribute for bond_masters file. This ends up in /sys/class/net */ +static const struct class_attribute class_attr_bonding_masters = { + .attr = { + .name = "bonding_masters", + .mode = 0644, + }, + .show = bonding_show_bonds, + .store = bonding_store_bonds, +}; + +/* Generic "store" method for bonding sysfs option setting */ +static ssize_t bonding_sysfs_store_option(struct device *d, + struct device_attribute *attr, + const char *buffer, size_t count) +{ + struct bonding *bond = to_bond(d); + const struct bond_option *opt; + char *buffer_clone; + int ret; + + opt = bond_opt_get_by_name(attr->attr.name); + if (WARN_ON(!opt)) + return -ENOENT; + buffer_clone = kstrndup(buffer, count, GFP_KERNEL); + if (!buffer_clone) + return -ENOMEM; + ret = bond_opt_tryset_rtnl(bond, opt->id, buffer_clone); + if (!ret) + ret = count; + kfree(buffer_clone); + + return ret; +} + +/* Show the slaves in the current bond. */ +static ssize_t bonding_show_slaves(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct bonding *bond = to_bond(d); + struct list_head *iter; + struct slave *slave; + int res = 0; + + if (!rtnl_trylock()) + return restart_syscall(); + + bond_for_each_slave(bond, slave, iter) { + if (res > (PAGE_SIZE - IFNAMSIZ)) { + /* not enough space for another interface name */ + if ((PAGE_SIZE - res) > 10) + res = PAGE_SIZE - 10; + res += sprintf(buf + res, "++more++ "); + break; + } + res += sprintf(buf + res, "%s ", slave->dev->name); + } + + rtnl_unlock(); + + if (res) + buf[res-1] = '\n'; /* eat the leftover space */ + + return res; +} +static DEVICE_ATTR(slaves, 0644, bonding_show_slaves, + bonding_sysfs_store_option); + +/* Show the bonding mode. */ +static ssize_t bonding_show_mode(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_MODE, BOND_MODE(bond)); + + return sprintf(buf, "%s %d\n", val->string, BOND_MODE(bond)); +} +static DEVICE_ATTR(mode, 0644, bonding_show_mode, bonding_sysfs_store_option); + +/* Show the bonding transmit hash method. */ +static ssize_t bonding_show_xmit_hash(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_XMIT_HASH, bond->params.xmit_policy); + + return sprintf(buf, "%s %d\n", val->string, bond->params.xmit_policy); +} +static DEVICE_ATTR(xmit_hash_policy, 0644, + bonding_show_xmit_hash, bonding_sysfs_store_option); + +/* Show arp_validate. */ +static ssize_t bonding_show_arp_validate(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, + bond->params.arp_validate); + + return sprintf(buf, "%s %d\n", val->string, bond->params.arp_validate); +} +static DEVICE_ATTR(arp_validate, 0644, bonding_show_arp_validate, + bonding_sysfs_store_option); + +/* Show arp_all_targets. */ +static ssize_t bonding_show_arp_all_targets(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_ARP_ALL_TARGETS, + bond->params.arp_all_targets); + return sprintf(buf, "%s %d\n", + val->string, bond->params.arp_all_targets); +} +static DEVICE_ATTR(arp_all_targets, 0644, + bonding_show_arp_all_targets, bonding_sysfs_store_option); + +/* Show fail_over_mac. */ +static ssize_t bonding_show_fail_over_mac(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC, + bond->params.fail_over_mac); + + return sprintf(buf, "%s %d\n", val->string, bond->params.fail_over_mac); +} +static DEVICE_ATTR(fail_over_mac, 0644, + bonding_show_fail_over_mac, bonding_sysfs_store_option); + +/* Show the arp timer interval. */ +static ssize_t bonding_show_arp_interval(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.arp_interval); +} +static DEVICE_ATTR(arp_interval, 0644, + bonding_show_arp_interval, bonding_sysfs_store_option); + +/* Show the arp targets. */ +static ssize_t bonding_show_arp_targets(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + int i, res = 0; + + for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) { + if (bond->params.arp_targets[i]) + res += sprintf(buf + res, "%pI4 ", + &bond->params.arp_targets[i]); + } + if (res) + buf[res-1] = '\n'; /* eat the leftover space */ + + return res; +} +static DEVICE_ATTR(arp_ip_target, 0644, + bonding_show_arp_targets, bonding_sysfs_store_option); + +/* Show the up and down delays. */ +static ssize_t bonding_show_downdelay(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon); +} +static DEVICE_ATTR(downdelay, 0644, + bonding_show_downdelay, bonding_sysfs_store_option); + +static ssize_t bonding_show_updelay(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon); + +} +static DEVICE_ATTR(updelay, 0644, + bonding_show_updelay, bonding_sysfs_store_option); + +static ssize_t bonding_show_peer_notif_delay(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", + bond->params.peer_notif_delay * bond->params.miimon); +} +static DEVICE_ATTR(peer_notif_delay, 0644, + bonding_show_peer_notif_delay, bonding_sysfs_store_option); + +/* Show the LACP interval. */ +static ssize_t bonding_show_lacp(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_LACP_RATE, bond->params.lacp_fast); + + return sprintf(buf, "%s %d\n", val->string, bond->params.lacp_fast); +} +static DEVICE_ATTR(lacp_rate, 0644, + bonding_show_lacp, bonding_sysfs_store_option); + +static ssize_t bonding_show_min_links(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%u\n", bond->params.min_links); +} +static DEVICE_ATTR(min_links, 0644, + bonding_show_min_links, bonding_sysfs_store_option); + +static ssize_t bonding_show_ad_select(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_AD_SELECT, bond->params.ad_select); + + return sprintf(buf, "%s %d\n", val->string, bond->params.ad_select); +} +static DEVICE_ATTR(ad_select, 0644, + bonding_show_ad_select, bonding_sysfs_store_option); + +/* Show the number of peer notifications to send after a failover event. */ +static ssize_t bonding_show_num_peer_notif(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + return sprintf(buf, "%d\n", bond->params.num_peer_notif); +} +static DEVICE_ATTR(num_grat_arp, 0644, + bonding_show_num_peer_notif, bonding_sysfs_store_option); +static DEVICE_ATTR(num_unsol_na, 0644, + bonding_show_num_peer_notif, bonding_sysfs_store_option); + +/* Show the MII monitor interval. */ +static ssize_t bonding_show_miimon(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.miimon); +} +static DEVICE_ATTR(miimon, 0644, + bonding_show_miimon, bonding_sysfs_store_option); + +/* Show the primary slave. */ +static ssize_t bonding_show_primary(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + struct slave *primary; + int count = 0; + + rcu_read_lock(); + primary = rcu_dereference(bond->primary_slave); + if (primary) + count = sprintf(buf, "%s\n", primary->dev->name); + rcu_read_unlock(); + + return count; +} +static DEVICE_ATTR(primary, 0644, + bonding_show_primary, bonding_sysfs_store_option); + +/* Show the primary_reselect flag. */ +static ssize_t bonding_show_primary_reselect(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + const struct bond_opt_value *val; + + val = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT, + bond->params.primary_reselect); + + return sprintf(buf, "%s %d\n", + val->string, bond->params.primary_reselect); +} +static DEVICE_ATTR(primary_reselect, 0644, + bonding_show_primary_reselect, bonding_sysfs_store_option); + +/* Show the use_carrier flag. */ +static ssize_t bonding_show_carrier(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.use_carrier); +} +static DEVICE_ATTR(use_carrier, 0644, + bonding_show_carrier, bonding_sysfs_store_option); + + +/* Show currently active_slave. */ +static ssize_t bonding_show_active_slave(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + struct net_device *slave_dev; + int count = 0; + + rcu_read_lock(); + slave_dev = bond_option_active_slave_get_rcu(bond); + if (slave_dev) + count = sprintf(buf, "%s\n", slave_dev->name); + rcu_read_unlock(); + + return count; +} +static DEVICE_ATTR(active_slave, 0644, + bonding_show_active_slave, bonding_sysfs_store_option); + +/* Show link status of the bond interface. */ +static ssize_t bonding_show_mii_status(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + bool active = netif_carrier_ok(bond->dev); + + return sprintf(buf, "%s\n", active ? "up" : "down"); +} +static DEVICE_ATTR(mii_status, 0444, bonding_show_mii_status, NULL); + +/* Show current 802.3ad aggregator ID. */ +static ssize_t bonding_show_ad_aggregator(struct device *d, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct ad_info ad_info; + count = sprintf(buf, "%d\n", + bond_3ad_get_active_agg_info(bond, &ad_info) + ? 0 : ad_info.aggregator_id); + } + + return count; +} +static DEVICE_ATTR(ad_aggregator, 0444, bonding_show_ad_aggregator, NULL); + + +/* Show number of active 802.3ad ports. */ +static ssize_t bonding_show_ad_num_ports(struct device *d, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + struct ad_info ad_info; + count = sprintf(buf, "%d\n", + bond_3ad_get_active_agg_info(bond, &ad_info) + ? 0 : ad_info.ports); + } + + return count; +} +static DEVICE_ATTR(ad_num_ports, 0444, bonding_show_ad_num_ports, NULL); + + +/* Show current 802.3ad actor key. */ +static ssize_t bonding_show_ad_actor_key(struct device *d, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) { + struct ad_info ad_info; + count = sprintf(buf, "%d\n", + bond_3ad_get_active_agg_info(bond, &ad_info) + ? 0 : ad_info.actor_key); + } + + return count; +} +static DEVICE_ATTR(ad_actor_key, 0444, bonding_show_ad_actor_key, NULL); + + +/* Show current 802.3ad partner key. */ +static ssize_t bonding_show_ad_partner_key(struct device *d, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) { + struct ad_info ad_info; + count = sprintf(buf, "%d\n", + bond_3ad_get_active_agg_info(bond, &ad_info) + ? 0 : ad_info.partner_key); + } + + return count; +} +static DEVICE_ATTR(ad_partner_key, 0444, bonding_show_ad_partner_key, NULL); + + +/* Show current 802.3ad partner mac. */ +static ssize_t bonding_show_ad_partner_mac(struct device *d, + struct device_attribute *attr, + char *buf) +{ + int count = 0; + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) { + struct ad_info ad_info; + if (!bond_3ad_get_active_agg_info(bond, &ad_info)) + count = sprintf(buf, "%pM\n", ad_info.partner_system); + } + + return count; +} +static DEVICE_ATTR(ad_partner_mac, 0444, bonding_show_ad_partner_mac, NULL); + +/* Show the queue_ids of the slaves in the current bond. */ +static ssize_t bonding_show_queue_id(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + struct list_head *iter; + struct slave *slave; + int res = 0; + + if (!rtnl_trylock()) + return restart_syscall(); + + bond_for_each_slave(bond, slave, iter) { + if (res > (PAGE_SIZE - IFNAMSIZ - 6)) { + /* not enough space for another interface_name:queue_id pair */ + if ((PAGE_SIZE - res) > 10) + res = PAGE_SIZE - 10; + res += sprintf(buf + res, "++more++ "); + break; + } + res += sprintf(buf + res, "%s:%d ", + slave->dev->name, slave->queue_id); + } + if (res) + buf[res-1] = '\n'; /* eat the leftover space */ + + rtnl_unlock(); + + return res; +} +static DEVICE_ATTR(queue_id, 0644, bonding_show_queue_id, + bonding_sysfs_store_option); + + +/* Show the all_slaves_active flag. */ +static ssize_t bonding_show_slaves_active(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.all_slaves_active); +} +static DEVICE_ATTR(all_slaves_active, 0644, + bonding_show_slaves_active, bonding_sysfs_store_option); + +/* Show the number of IGMP membership reports to send on link failure */ +static ssize_t bonding_show_resend_igmp(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.resend_igmp); +} +static DEVICE_ATTR(resend_igmp, 0644, + bonding_show_resend_igmp, bonding_sysfs_store_option); + + +static ssize_t bonding_show_lp_interval(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + return sprintf(buf, "%d\n", bond->params.lp_interval); +} +static DEVICE_ATTR(lp_interval, 0644, + bonding_show_lp_interval, bonding_sysfs_store_option); + +static ssize_t bonding_show_tlb_dynamic_lb(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + return sprintf(buf, "%d\n", bond->params.tlb_dynamic_lb); +} +static DEVICE_ATTR(tlb_dynamic_lb, 0644, + bonding_show_tlb_dynamic_lb, bonding_sysfs_store_option); + +static ssize_t bonding_show_packets_per_slave(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + unsigned int packets_per_slave = bond->params.packets_per_slave; + + return sprintf(buf, "%u\n", packets_per_slave); +} +static DEVICE_ATTR(packets_per_slave, 0644, + bonding_show_packets_per_slave, bonding_sysfs_store_option); + +static ssize_t bonding_show_ad_actor_sys_prio(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) + return sprintf(buf, "%hu\n", bond->params.ad_actor_sys_prio); + + return 0; +} +static DEVICE_ATTR(ad_actor_sys_prio, 0644, + bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option); + +static ssize_t bonding_show_ad_actor_system(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) + return sprintf(buf, "%pM\n", bond->params.ad_actor_system); + + return 0; +} + +static DEVICE_ATTR(ad_actor_system, 0644, + bonding_show_ad_actor_system, bonding_sysfs_store_option); + +static ssize_t bonding_show_ad_user_port_key(struct device *d, + struct device_attribute *attr, + char *buf) +{ + struct bonding *bond = to_bond(d); + + if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) + return sprintf(buf, "%hu\n", bond->params.ad_user_port_key); + + return 0; +} +static DEVICE_ATTR(ad_user_port_key, 0644, + bonding_show_ad_user_port_key, bonding_sysfs_store_option); + +static struct attribute *per_bond_attrs[] = { + &dev_attr_slaves.attr, + &dev_attr_mode.attr, + &dev_attr_fail_over_mac.attr, + &dev_attr_arp_validate.attr, + &dev_attr_arp_all_targets.attr, + &dev_attr_arp_interval.attr, + &dev_attr_arp_ip_target.attr, + &dev_attr_downdelay.attr, + &dev_attr_updelay.attr, + &dev_attr_peer_notif_delay.attr, + &dev_attr_lacp_rate.attr, + &dev_attr_ad_select.attr, + &dev_attr_xmit_hash_policy.attr, + &dev_attr_num_grat_arp.attr, + &dev_attr_num_unsol_na.attr, + &dev_attr_miimon.attr, + &dev_attr_primary.attr, + &dev_attr_primary_reselect.attr, + &dev_attr_use_carrier.attr, + &dev_attr_active_slave.attr, + &dev_attr_mii_status.attr, + &dev_attr_ad_aggregator.attr, + &dev_attr_ad_num_ports.attr, + &dev_attr_ad_actor_key.attr, + &dev_attr_ad_partner_key.attr, + &dev_attr_ad_partner_mac.attr, + &dev_attr_queue_id.attr, + &dev_attr_all_slaves_active.attr, + &dev_attr_resend_igmp.attr, + &dev_attr_min_links.attr, + &dev_attr_lp_interval.attr, + &dev_attr_packets_per_slave.attr, + &dev_attr_tlb_dynamic_lb.attr, + &dev_attr_ad_actor_sys_prio.attr, + &dev_attr_ad_actor_system.attr, + &dev_attr_ad_user_port_key.attr, + NULL, +}; + +static const struct attribute_group bonding_group = { + .name = "bonding", + .attrs = per_bond_attrs, +}; + +/* Initialize sysfs. This sets up the bonding_masters file in + * /sys/class/net. + */ +int bond_create_sysfs(struct bond_net *bn) +{ + int ret; + + bn->class_attr_bonding_masters = class_attr_bonding_masters; + sysfs_attr_init(&bn->class_attr_bonding_masters.attr); + + ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters, + bn->net); + /* Permit multiple loads of the module by ignoring failures to + * create the bonding_masters sysfs file. Bonding devices + * created by second or subsequent loads of the module will + * not be listed in, or controllable by, bonding_masters, but + * will have the usual "bonding" sysfs directory. + * + * This is done to preserve backwards compatibility for + * initscripts/sysconfig, which load bonding multiple times to + * configure multiple bonding devices. + */ + if (ret == -EEXIST) { + /* Is someone being kinky and naming a device bonding_master? */ + if (__dev_get_by_name(bn->net, + class_attr_bonding_masters.attr.name)) + pr_err("network device named %s already exists in sysfs\n", + class_attr_bonding_masters.attr.name); + ret = 0; + } + + return ret; + +} + +/* Remove /sys/class/net/bonding_masters. */ +void bond_destroy_sysfs(struct bond_net *bn) +{ + netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net); +} + +/* Initialize sysfs for each bond. This sets up and registers + * the 'bondctl' directory for each individual bond under /sys/class/net. + */ +void bond_prepare_sysfs_group(struct bonding *bond) +{ + bond->dev->sysfs_groups[0] = &bonding_group; +} + diff --git a/drivers/net/bonding/bond_sysfs_slave.c b/drivers/net/bonding/bond_sysfs_slave.c new file mode 100644 index 000000000..6a6cdd0bb --- /dev/null +++ b/drivers/net/bonding/bond_sysfs_slave.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Sysfs attributes of bond slaves + * + * Copyright (c) 2014 Scott Feldman <sfeldma@cumulusnetworks.com> + */ + +#include <linux/capability.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> + +#include <net/bonding.h> + +struct slave_attribute { + struct attribute attr; + ssize_t (*show)(struct slave *, char *); +}; + +#define SLAVE_ATTR(_name, _mode, _show) \ +const struct slave_attribute slave_attr_##_name = { \ + .attr = {.name = __stringify(_name), \ + .mode = _mode }, \ + .show = _show, \ +}; +#define SLAVE_ATTR_RO(_name) \ + SLAVE_ATTR(_name, 0444, _name##_show) + +static ssize_t state_show(struct slave *slave, char *buf) +{ + switch (bond_slave_state(slave)) { + case BOND_STATE_ACTIVE: + return sprintf(buf, "active\n"); + case BOND_STATE_BACKUP: + return sprintf(buf, "backup\n"); + default: + return sprintf(buf, "UNKNOWN\n"); + } +} +static SLAVE_ATTR_RO(state); + +static ssize_t mii_status_show(struct slave *slave, char *buf) +{ + return sprintf(buf, "%s\n", bond_slave_link_status(slave->link)); +} +static SLAVE_ATTR_RO(mii_status); + +static ssize_t link_failure_count_show(struct slave *slave, char *buf) +{ + return sprintf(buf, "%d\n", slave->link_failure_count); +} +static SLAVE_ATTR_RO(link_failure_count); + +static ssize_t perm_hwaddr_show(struct slave *slave, char *buf) +{ + return sprintf(buf, "%*phC\n", + slave->dev->addr_len, + slave->perm_hwaddr); +} +static SLAVE_ATTR_RO(perm_hwaddr); + +static ssize_t queue_id_show(struct slave *slave, char *buf) +{ + return sprintf(buf, "%d\n", slave->queue_id); +} +static SLAVE_ATTR_RO(queue_id); + +static ssize_t ad_aggregator_id_show(struct slave *slave, char *buf) +{ + const struct aggregator *agg; + + if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) { + agg = SLAVE_AD_INFO(slave)->port.aggregator; + if (agg) + return sprintf(buf, "%d\n", + agg->aggregator_identifier); + } + + return sprintf(buf, "N/A\n"); +} +static SLAVE_ATTR_RO(ad_aggregator_id); + +static ssize_t ad_actor_oper_port_state_show(struct slave *slave, char *buf) +{ + const struct port *ad_port; + + if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) { + ad_port = &SLAVE_AD_INFO(slave)->port; + if (ad_port->aggregator) + return sprintf(buf, "%u\n", + ad_port->actor_oper_port_state); + } + + return sprintf(buf, "N/A\n"); +} +static SLAVE_ATTR_RO(ad_actor_oper_port_state); + +static ssize_t ad_partner_oper_port_state_show(struct slave *slave, char *buf) +{ + const struct port *ad_port; + + if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) { + ad_port = &SLAVE_AD_INFO(slave)->port; + if (ad_port->aggregator) + return sprintf(buf, "%u\n", + ad_port->partner_oper.port_state); + } + + return sprintf(buf, "N/A\n"); +} +static SLAVE_ATTR_RO(ad_partner_oper_port_state); + +static const struct attribute *slave_attrs[] = { + &slave_attr_state.attr, + &slave_attr_mii_status.attr, + &slave_attr_link_failure_count.attr, + &slave_attr_perm_hwaddr.attr, + &slave_attr_queue_id.attr, + &slave_attr_ad_aggregator_id.attr, + &slave_attr_ad_actor_oper_port_state.attr, + &slave_attr_ad_partner_oper_port_state.attr, + NULL +}; + +#define to_slave_attr(_at) container_of(_at, struct slave_attribute, attr) + +static ssize_t slave_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + struct slave_attribute *slave_attr = to_slave_attr(attr); + struct slave *slave = to_slave(kobj); + + return slave_attr->show(slave, buf); +} + +const struct sysfs_ops slave_sysfs_ops = { + .show = slave_show, +}; + +int bond_sysfs_slave_add(struct slave *slave) +{ + return sysfs_create_files(&slave->kobj, slave_attrs); +} + +void bond_sysfs_slave_del(struct slave *slave) +{ + sysfs_remove_files(&slave->kobj, slave_attrs); +} diff --git a/drivers/net/bonding/bonding_priv.h b/drivers/net/bonding/bonding_priv.h new file mode 100644 index 000000000..48cdf3a49 --- /dev/null +++ b/drivers/net/bonding/bonding_priv.h @@ -0,0 +1,24 @@ +/* + * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'. + * + * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes + * NCM: Network and Communications Management, Inc. + * + * BUT, I'm the one who modified it for ethernet, so: + * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov + * + * This software may be used and distributed according to the terms + * of the GNU Public License, incorporated herein by reference. + * + */ + +#ifndef _BONDING_PRIV_H +#define _BONDING_PRIV_H +#include <generated/utsrelease.h> + +#define DRV_NAME "bonding" +#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver" + +#define bond_version DRV_DESCRIPTION ": v" UTS_RELEASE "\n" + +#endif |