diff options
Diffstat (limited to 'drivers/net/bonding/bond_main.c')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 6475 |
1 files changed, 6475 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c new file mode 100644 index 000000000..710734a5a --- /dev/null +++ b/drivers/net/bonding/bond_main.c @@ -0,0 +1,6475 @@ +/* + * 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/filter.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/phy.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> +#if IS_ENABLED(CONFIG_TLS_DEVICE) +#include <net/tls.h> +#endif +#include <net/ip6_route.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, 5 for vlan+srcmac"); +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); +} + +bool bond_sk_check(struct bonding *bond) +{ + switch (BOND_MODE(bond)) { + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) + return true; + fallthrough; + default: + return false; + } +} + +static bool bond_xdp_check(struct bonding *bond) +{ + switch (BOND_MODE(bond)) { + case BOND_MODE_ROUNDROBIN: + case BOND_MODE_ACTIVEBACKUP: + return true; + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + /* vlan+srcmac is not supported with XDP as in most cases the 802.1q + * payload is not in the packet due to hardware offload. + */ + if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) + return true; + fallthrough; + default: + return false; + } +} + +/*---------------------------------- 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_eth_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 */ + strscpy_pad(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 ndo_eth_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; + + __dev_addr_set(bond_dev, 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; + } + +} + +/** + * bond_choose_primary_or_current - select the primary or high priority slave + * @bond: our bonding struct + * + * - Check if there is a primary link. If the primary link was set and is up, + * go on and do link reselection. + * + * - If primary link is not set or down, find the highest priority link. + * If the highest priority link is not current slave, set it as primary + * link and do link reselection. + */ +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); + struct slave *slave, *hprio = NULL; + struct list_head *iter; + + if (!prim || prim->link != BOND_LINK_UP) { + bond_for_each_slave(bond, slave, iter) { + if (slave->link == BOND_LINK_UP) { + hprio = hprio ?: slave; + if (slave->prio > hprio->prio) + hprio = slave; + } + } + + if (hprio && hprio != curr) { + prim = hprio; + goto link_reselect; + } + + if (!curr || curr->link != BOND_LINK_UP) + return NULL; + return curr; + } + + if (bond->force_primary) { + bond->force_primary = false; + return prim; + } + +link_reselect: + 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; +} + +/** + * bond_change_active_slave - 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; + +#if IS_ENABLED(CONFIG_TLS_DEVICE) + if (bond_sk_check(bond)) + features |= BOND_TLS_FEATURES; + else + features &= ~BOND_TLS_FEATURES; +#endif + + 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_GSO_SOFTWARE | \ + NETIF_F_HIGHDMA | NETIF_F_LRO) + +#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ + NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) + +#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ + NETIF_F_GSO_SOFTWARE) + + +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 tso_max_size = TSO_MAX_SIZE; + u16 tso_max_segs = TSO_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; + + tso_max_size = min(tso_max_size, slave->dev->tso_max_size); + tso_max_segs = min(tso_max_segs, slave->dev->tso_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; +#ifdef CONFIG_XFRM_OFFLOAD + bond_dev->hw_enc_features |= xfrm_features; +#endif /* CONFIG_XFRM_OFFLOAD */ + bond_dev->mpls_features = mpls_features; + netif_set_tso_max_segs(bond_dev, tso_max_segs); + netif_set_tso_max_size(bond_dev, tso_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; + case BOND_XMIT_POLICY_VLAN_SRCMAC: + return NETDEV_LAG_HASH_VLAN_SRCMAC; + 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); +} + +#define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ + if (extack) \ + NL_SET_ERR_MSG(extack, errmsg); \ + else \ + netdev_err(bond_dev, "Error: %s\n", errmsg); \ +} while (0) + +#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ + if (extack) \ + NL_SET_ERR_MSG(extack, errmsg); \ + else \ + slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ +} while (0) + +/* The bonding driver uses ether_setup() to convert a master bond device + * to ARPHRD_ETHER, that resets the target netdevice's flags so we always + * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP + * if they were set + */ +static void bond_ether_setup(struct net_device *bond_dev) +{ + unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP); + + ether_setup(bond_dev); + bond_dev->flags |= IFF_MASTER | flags; + bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; +} + +/* 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 (slave_dev->flags & IFF_MASTER && + !netif_is_bond_master(slave_dev)) { + BOND_NL_ERR(bond_dev, extack, + "Device type (master device) cannot be enslaved"); + return -EPERM; + } + + if (!bond->params.use_carrier && + slave_dev->ethtool_ops->get_link == NULL && + slave_ops->ndo_eth_ioctl == NULL) { + slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); + } + + /* already in-use? */ + if (netdev_is_rx_handler_busy(slave_dev)) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Device is in use and cannot be enslaved"); + return -EBUSY; + } + + if (bond_dev == slave_dev) { + BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); + 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)) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Can not enslave VLAN challenged device to VLAN enabled bond"); + 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) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Device can not be enslaved while up"); + 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 + bond_ether_setup(bond_dev); + + call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, + bond_dev); + } + } else if (bond_dev->type != slave_dev->type) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Device type is different from other slaves"); + return -EINVAL; + } + + if (slave_dev->type == ARPHRD_INFINIBAND && + BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Only active-backup mode is supported for infiniband slaves"); + 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 { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); + 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; + + new_slave->last_tx = 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); + } 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; + } + + bond_lower_state_changed(new_slave); + + 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); + + + if (!slave_dev->netdev_ops->ndo_bpf || + !slave_dev->netdev_ops->ndo_xdp_xmit) { + if (bond->xdp_prog) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Slave does not support XDP"); + res = -EOPNOTSUPP; + goto err_sysfs_del; + } + } else if (bond->xdp_prog) { + struct netdev_bpf xdp = { + .command = XDP_SETUP_PROG, + .flags = 0, + .prog = bond->xdp_prog, + .extack = extack, + }; + + if (dev_xdp_prog_count(slave_dev) > 0) { + SLAVE_NL_ERR(bond_dev, slave_dev, extack, + "Slave has XDP program loaded, please unload before enslaving"); + res = -EOPNOTSUPP; + goto err_sysfs_del; + } + + res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); + if (res < 0) { + /* ndo_bpf() sets extack error message */ + slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); + goto err_sysfs_del; + } + if (bond->xdp_prog) + bpf_prog_inc(bond->xdp_prog); + } + + 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); + bond_ether_setup(bond_dev); + } + } + + 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); + + if (bond->xdp_prog) { + struct netdev_bpf xdp = { + .command = XDP_SETUP_PROG, + .flags = 0, + .prog = NULL, + .extack = NULL, + }; + if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) + slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); + } + + /* 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 slave *slave, *primary, *active; + bool do_failover = false; + struct list_head *iter; + + ASSERT_RTNL(); + + 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); + + active = rtnl_dereference(bond->curr_active_slave); + if (!active || slave == primary || slave->prio > active->prio) + do_failover = true; + + 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)) + do_failover = true; + + 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; + } + } + + if (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; +} + +static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, + struct sk_buff *skb) +{ + struct net_device *bond_dev = slave->bond->dev; + struct net_device *slave_dev = slave->dev; + struct bond_vlan_tag *outer_tag = tags; + + if (!tags || tags->vlan_proto == VLAN_N_VID) + return true; + + 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 false; + } + + 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); + } + + return true; +} + +/* 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 net_device *bond_dev = slave->bond->dev; + struct net_device *slave_dev = slave->dev; + struct sk_buff *skb; + + 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 (bond_handle_vlan(slave, tags, skb)) { + slave_update_last_tx(slave); + arp_xmit(skb); + } + + return; +} + +/* 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) + pr_warn_once("%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; +} + +static 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; + unsigned int alen; + + alen = arp_hdr_len(bond->dev); + + 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, slave_last_tx(curr_arp_slave), 1)) + bond_validate_arp(bond, slave, sip, tip); + +out_unlock: + if (arp != (struct arphdr *)skb->data) + kfree(arp); + return RX_HANDLER_ANOTHER; +} + +#if IS_ENABLED(CONFIG_IPV6) +static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, + const struct in6_addr *saddr, struct bond_vlan_tag *tags) +{ + struct net_device *bond_dev = slave->bond->dev; + struct net_device *slave_dev = slave->dev; + struct in6_addr mcaddr; + struct sk_buff *skb; + + slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", + daddr, saddr); + + skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); + if (!skb) { + net_err_ratelimited("NS packet allocation failed\n"); + return; + } + + addrconf_addr_solict_mult(daddr, &mcaddr); + if (bond_handle_vlan(slave, tags, skb)) { + slave_update_last_tx(slave); + ndisc_send_skb(skb, &mcaddr, saddr); + } +} + +static void bond_ns_send_all(struct bonding *bond, struct slave *slave) +{ + struct in6_addr *targets = bond->params.ns_targets; + struct bond_vlan_tag *tags; + struct dst_entry *dst; + struct in6_addr saddr; + struct flowi6 fl6; + int i; + + for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { + slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", + __func__, &targets[i]); + tags = NULL; + + /* Find out through which dev should the packet go */ + memset(&fl6, 0, sizeof(struct flowi6)); + fl6.daddr = targets[i]; + fl6.flowi6_oif = bond->dev->ifindex; + + dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); + if (dst->error) { + dst_release(dst); + /* there's no route to target - try to send arp + * probe to generate any traffic (arp_validate=0) + */ + if (bond->params.arp_validate) + pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", + bond->dev->name, + &targets[i]); + bond_ns_send(slave, &targets[i], &in6addr_any, tags); + continue; + } + + /* bond device itself */ + if (dst->dev == bond->dev) + goto found; + + rcu_read_lock(); + tags = bond_verify_device_path(bond->dev, 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 ns_ip6_target %pI6c via dst->dev %s\n", + &targets[i], dst->dev ? dst->dev->name : "NULL"); + + dst_release(dst); + continue; + +found: + if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) + bond_ns_send(slave, &targets[i], &saddr, tags); + else + bond_ns_send(slave, &targets[i], &in6addr_any, tags); + + dst_release(dst); + kfree(tags); + } +} + +static int bond_confirm_addr6(struct net_device *dev, + struct netdev_nested_priv *priv) +{ + struct in6_addr *addr = (struct in6_addr *)priv->data; + + return ipv6_chk_addr(dev_net(dev), addr, dev, 0); +} + +static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) +{ + struct netdev_nested_priv priv = { + .data = addr, + }; + int ret = false; + + if (bond_confirm_addr6(bond->dev, &priv)) + return true; + + rcu_read_lock(); + if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) + ret = true; + rcu_read_unlock(); + + return ret; +} + +static void bond_validate_na(struct bonding *bond, struct slave *slave, + struct in6_addr *saddr, struct in6_addr *daddr) +{ + int i; + + /* Ignore NAs that: + * 1. Source address is unspecified address. + * 2. Dest address is neither all-nodes multicast address nor + * exist on bond interface. + */ + if (ipv6_addr_any(saddr) || + (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && + !bond_has_this_ip6(bond, daddr))) { + slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", + __func__, saddr, daddr); + return; + } + + i = bond_get_targets_ip6(bond->params.ns_targets, saddr); + if (i == -1) { + slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", + __func__, saddr); + return; + } + slave->last_rx = jiffies; + slave->target_last_arp_rx[i] = jiffies; +} + +static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ + struct slave *curr_active_slave, *curr_arp_slave; + struct in6_addr *saddr, *daddr; + struct { + struct ipv6hdr ip6; + struct icmp6hdr icmp6; + } *combined, _combined; + + if (skb->pkt_type == PACKET_OTHERHOST || + skb->pkt_type == PACKET_LOOPBACK) + goto out; + + combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); + if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || + (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION && + combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)) + goto out; + + saddr = &combined->ip6.saddr; + daddr = &combined->ip6.daddr; + + slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", + __func__, slave->dev->name, bond_slave_state(slave), + bond->params.arp_validate, slave_do_arp_validate(bond, slave), + saddr, daddr); + + 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: + * see bond_arp_rcv(). + */ + if (bond_is_active_slave(slave)) + bond_validate_na(bond, slave, saddr, daddr); + else if (curr_active_slave && + time_after(slave_last_rx(bond, curr_active_slave), + curr_active_slave->last_link_up)) + bond_validate_na(bond, slave, daddr, saddr); + else if (curr_arp_slave && + bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) + bond_validate_na(bond, slave, saddr, daddr); + +out: + return RX_HANDLER_ANOTHER; +} +#endif + +int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, + struct slave *slave) +{ +#if IS_ENABLED(CONFIG_IPV6) + bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); +#endif + bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); + + slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", + __func__, skb->dev->name); + + /* Use arp validate logic for both ARP and NS */ + if (!slave_do_arp_validate(bond, slave)) { + if ((slave_do_arp_validate_only(bond) && is_arp) || +#if IS_ENABLED(CONFIG_IPV6) + (slave_do_arp_validate_only(bond) && is_ipv6) || +#endif + !slave_do_arp_validate_only(bond)) + slave->last_rx = jiffies; + return RX_HANDLER_ANOTHER; + } else if (is_arp) { + return bond_arp_rcv(skb, bond, slave); +#if IS_ENABLED(CONFIG_IPV6) + } else if (is_ipv6) { + return bond_na_rcv(skb, bond, slave); +#endif + } else { + return RX_HANDLER_ANOTHER; + } +} + +static void bond_send_validate(struct bonding *bond, struct slave *slave) +{ + bond_arp_send_all(bond, slave); +#if IS_ENABLED(CONFIG_IPV6) + bond_ns_send_all(bond, slave); +#endif +} + +/* 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 last_tx = slave_last_tx(slave); + + bond_propose_link_state(slave, BOND_LINK_NOCHANGE); + + if (slave->link != BOND_LINK_UP) { + if (bond_time_in_interval(bond, last_tx, 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, last_tx, bond->params.missed_max) || + !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { + + 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_send_validate(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 last_tx, 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 (missed_max+1)*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, bond->params.missed_max + 1)) { + bond_propose_link_state(slave, BOND_LINK_DOWN); + commit++; + } + + /* Active slave is down if: + * - more than missed_max*delta since transmitting OR + * - (more than missed_max*delta since receive AND + * the bond has an IP address) + */ + last_tx = slave_last_tx(slave); + if (bond_is_active_slave(slave) && + (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || + !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { + 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) +{ + bool do_failover = false; + struct list_head *iter; + unsigned long last_tx; + struct slave *slave; + + bond_for_each_slave(bond, slave, iter) { + switch (slave->link_new_state) { + case BOND_LINK_NOCHANGE: + continue; + + case BOND_LINK_UP: + last_tx = slave_last_tx(slave); + if (rtnl_dereference(bond->curr_active_slave) != slave || + (!rtnl_dereference(bond->curr_active_slave) && + bond_time_in_interval(bond, last_tx, 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) || + slave->prio > rtnl_dereference(bond->curr_active_slave)->prio) + do_failover = true; + + } + + 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); + do_failover = true; + } + + 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; + } + } + + if (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_send_validate(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_send_validate(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 -----------------------------*/ + +/* Helper to access data in a packet, with or without a backing skb. + * If skb is given the data is linearized if necessary via pskb_may_pull. + */ +static inline const void *bond_pull_data(struct sk_buff *skb, + const void *data, int hlen, int n) +{ + if (likely(n <= hlen)) + return data; + else if (skb && likely(pskb_may_pull(skb, n))) + return skb->data; + + return NULL; +} + +/* L2 hash helper */ +static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) +{ + struct ethhdr *ep; + + data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); + if (!data) + return 0; + + ep = (struct ethhdr *)(data + mhoff); + return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); +} + +static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, + int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) +{ + const struct ipv6hdr *iph6; + const struct iphdr *iph; + + if (l2_proto == htons(ETH_P_IP)) { + data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); + if (!data) + return false; + + iph = (const struct iphdr *)(data + *nhoff); + iph_to_flow_copy_v4addrs(fk, iph); + *nhoff += iph->ihl << 2; + if (!ip_is_fragment(iph)) + *ip_proto = iph->protocol; + } else if (l2_proto == htons(ETH_P_IPV6)) { + data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); + if (!data) + return false; + + iph6 = (const struct ipv6hdr *)(data + *nhoff); + iph_to_flow_copy_v6addrs(fk, iph6); + *nhoff += sizeof(*iph6); + *ip_proto = iph6->nexthdr; + } else { + return false; + } + + if (l34 && *ip_proto >= 0) + fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); + + return true; +} + +static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) +{ + u32 srcmac_vendor = 0, srcmac_dev = 0; + struct ethhdr *mac_hdr; + u16 vlan = 0; + int i; + + data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); + if (!data) + return 0; + mac_hdr = (struct ethhdr *)(data + mhoff); + + for (i = 0; i < 3; i++) + srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; + + for (i = 3; i < ETH_ALEN; i++) + srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; + + if (skb && skb_vlan_tag_present(skb)) + vlan = skb_vlan_tag_get(skb); + + return vlan ^ srcmac_vendor ^ srcmac_dev; +} + +/* Extract the appropriate headers based on bond's xmit policy */ +static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, + __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) +{ + bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; + int ip_proto = -1; + + switch (bond->params.xmit_policy) { + case BOND_XMIT_POLICY_ENCAP23: + case BOND_XMIT_POLICY_ENCAP34: + memset(fk, 0, sizeof(*fk)); + return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, + fk, data, l2_proto, nhoff, hlen, 0); + default: + break; + } + + fk->ports.ports = 0; + memset(&fk->icmp, 0, sizeof(fk->icmp)); + if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_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 (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { + skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); + if (ip_proto == IPPROTO_ICMP) { + if (!icmp_is_err(fk->icmp.type)) + return true; + + nhoff += sizeof(struct icmphdr); + } else if (ip_proto == IPPROTO_ICMPV6) { + if (!icmpv6_is_err(fk->icmp.type)) + return true; + + nhoff += sizeof(struct icmp6hdr); + } + return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); + } + + return true; +} + +static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) +{ + hash ^= (__force u32)flow_get_u32_dst(flow) ^ + (__force u32)flow_get_u32_src(flow); + hash ^= (hash >> 16); + hash ^= (hash >> 8); + + /* discard lowest hash bit to deal with the common even ports pattern */ + if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || + xmit_policy == BOND_XMIT_POLICY_ENCAP34) + return hash >> 1; + + return hash; +} + +/* Generate hash based on xmit policy. If @skb is given it is used to linearize + * the data as required, but this function can be used without it if the data is + * known to be linear (e.g. with xdp_buff). + */ +static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, + __be16 l2_proto, int mhoff, int nhoff, int hlen) +{ + struct flow_keys flow; + u32 hash; + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) + return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || + !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) + return bond_eth_hash(skb, data, mhoff, hlen); + + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || + bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { + hash = bond_eth_hash(skb, data, mhoff, hlen); + } else { + if (flow.icmp.id) + memcpy(&hash, &flow.icmp, sizeof(hash)); + else + memcpy(&hash, &flow.ports.ports, sizeof(hash)); + } + + return bond_ip_hash(hash, &flow, bond->params.xmit_policy); +} + +/** + * 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) +{ + if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && + skb->l4_hash) + return skb->hash; + + return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, + 0, skb_network_offset(skb), + skb_headlen(skb)); +} + +/** + * bond_xmit_hash_xdp - generate a hash value based on the xmit policy + * @bond: bonding device + * @xdp: buffer to use for headers + * + * The XDP variant of bond_xmit_hash. + */ +static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) +{ + struct ethhdr *eth; + + if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) + return 0; + + eth = (struct ethhdr *)xdp->data; + + return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, + sizeof(struct ethhdr), xdp->data_end - xdp->data); +} + +/*-------------------------- 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; + + if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { + bond->rr_tx_counter = alloc_percpu(u32); + if (!bond->rr_tx_counter) + return -ENOMEM; + } + + /* 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_rcv_validate; + } + + 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_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct mii_ioctl_data *mii = NULL; + const struct net_device_ops *ops; + struct net_device *real_dev; + struct hwtstamp_config cfg; + struct ifreq ifrr; + int res = 0; + + netdev_dbg(bond_dev, "bond_eth_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; + } + + break; + case SIOCSHWTSTAMP: + if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) + return -EFAULT; + + if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) + return -EOPNOTSUPP; + + fallthrough; + case SIOCGHWTSTAMP: + real_dev = bond_option_active_slave_get_rcu(bond); + if (!real_dev) + return -EOPNOTSUPP; + + strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); + ifrr.ifr_ifru = ifr->ifr_ifru; + + ops = real_dev->netdev_ops; + if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { + res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); + if (res) + return res; + + ifr->ifr_ifru = ifrr.ifr_ifru; + if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) + return -EFAULT; + + /* Set the BOND_PHC_INDEX flag to notify user space */ + cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; + + return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? + -EFAULT : 0; + } + fallthrough; + default: + res = -EOPNOTSUPP; + } + + return res; +} + +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 bond_opt_value newval; + struct net *net; + int res = 0; + + netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); + + switch (cmd) { + 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 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 SIOCBONDENSLAVE: + res = bond_enslave(bond_dev, slave_dev, NULL); + break; + case SIOCBONDRELEASE: + res = bond_release(bond_dev, slave_dev); + break; + case SIOCBONDSETHWADDR: + res = bond_set_dev_addr(bond_dev, slave_dev); + break; + 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 int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, + void __user *data, int cmd) +{ + struct ifreq ifrdata = { .ifr_data = data }; + + switch (cmd) { + case BOND_INFO_QUERY_OLD: + return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); + case BOND_SLAVE_INFO_QUERY_OLD: + return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); + case BOND_ENSLAVE_OLD: + return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); + case BOND_RELEASE_OLD: + return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); + case BOND_SETHWADDR_OLD: + return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); + case BOND_CHANGE_ACTIVE_OLD: + return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); + } + + return -EOPNOTSUPP; +} + +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 */ + dev_addr_set(bond_dev, ss->__data); + 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 = get_random_u32(); + break; + case 1: + slave_id = this_cpu_inc_return(*bond->rr_tx_counter); + break; + default: + reciprocal_packets_per_slave = + bond->params.reciprocal_packets_per_slave; + slave_id = this_cpu_inc_return(*bond->rr_tx_counter); + slave_id = reciprocal_divide(slave_id, + reciprocal_packets_per_slave); + break; + } + + 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 struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, + struct xdp_buff *xdp) +{ + struct slave *slave; + int slave_cnt; + u32 slave_id; + const struct ethhdr *eth; + void *data = xdp->data; + + if (data + sizeof(struct ethhdr) > xdp->data_end) + goto non_igmp; + + eth = (struct ethhdr *)data; + data += sizeof(struct ethhdr); + + /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ + if (eth->h_proto == htons(ETH_P_IP)) { + const struct iphdr *iph; + + if (data + sizeof(struct iphdr) > xdp->data_end) + goto non_igmp; + + iph = (struct iphdr *)data; + + 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) +{ + 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); + 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; + + might_sleep(); + + 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; + + spin_lock_bh(&bond->mode_lock); + if (bond_3ad_get_active_agg_info(bond, &ad_info)) { + spin_unlock_bh(&bond->mode_lock); + 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; + } + spin_unlock_bh(&bond->mode_lock); + 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; +} + +static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, + struct xdp_buff *xdp) +{ + struct bond_up_slave *slaves; + unsigned int count; + u32 hash; + + hash = bond_xmit_hash_xdp(bond, xdp); + slaves = rcu_dereference(bond->usable_slaves); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (unlikely(!count)) + return NULL; + + return slaves->arr[hash % count]; +} + +/* 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; + + dev_core_stats_tx_dropped_inc(bond_dev); + 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); + 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 void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) +{ + switch (sk->sk_family) { +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + if (ipv6_only_sock(sk) || + ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { + flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; + flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; + flow->addrs.v6addrs.dst = sk->sk_v6_daddr; + break; + } + fallthrough; +#endif + default: /* AF_INET */ + flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; + flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; + flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; + break; + } + + flow->ports.src = inet_sk(sk)->inet_sport; + flow->ports.dst = inet_sk(sk)->inet_dport; +} + +/** + * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields + * @sk: socket to use for headers + * + * This function will extract the necessary field from the socket and use + * them to generate a hash based on the LAYER34 xmit_policy. + * Assumes that sk is a TCP or UDP socket. + */ +static u32 bond_sk_hash_l34(struct sock *sk) +{ + struct flow_keys flow; + u32 hash; + + bond_sk_to_flow(sk, &flow); + + /* L4 */ + memcpy(&hash, &flow.ports.ports, sizeof(hash)); + /* L3 */ + return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); +} + +static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, + struct sock *sk) +{ + struct bond_up_slave *slaves; + struct slave *slave; + unsigned int count; + u32 hash; + + slaves = rcu_dereference(bond->usable_slaves); + count = slaves ? READ_ONCE(slaves->count) : 0; + if (unlikely(!count)) + return NULL; + + hash = bond_sk_hash_l34(sk); + slave = slaves->arr[hash % count]; + + return slave->dev; +} + +static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, + struct sock *sk) +{ + struct bonding *bond = netdev_priv(dev); + struct net_device *lower = NULL; + + rcu_read_lock(); + if (bond_sk_check(bond)) + lower = __bond_sk_get_lower_dev(bond, sk); + rcu_read_unlock(); + + return lower; +} + +#if IS_ENABLED(CONFIG_TLS_DEVICE) +static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, + struct net_device *dev) +{ + struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); + + /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded + * was true, if tls_device_down is running in parallel, but it's OK, + * because bond_get_slave_by_dev has a NULL check. + */ + if (likely(bond_get_slave_by_dev(bond, tls_netdev))) + return bond_dev_queue_xmit(bond, skb, tls_netdev); + return bond_tx_drop(dev, skb); +} +#endif + +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; + +#if IS_ENABLED(CONFIG_TLS_DEVICE) + if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) + return bond_tls_device_xmit(bond, skb, dev); +#endif + + 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 struct net_device * +bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) +{ + struct bonding *bond = netdev_priv(bond_dev); + struct slave *slave; + + /* Caller needs to hold rcu_read_lock() */ + + switch (BOND_MODE(bond)) { + case BOND_MODE_ROUNDROBIN: + slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); + break; + + case BOND_MODE_ACTIVEBACKUP: + slave = bond_xmit_activebackup_slave_get(bond); + break; + + case BOND_MODE_8023AD: + case BOND_MODE_XOR: + slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); + break; + + default: + /* Should never happen. Mode guarded by bond_xdp_check() */ + netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); + WARN_ON_ONCE(1); + return NULL; + } + + if (slave) + return slave->dev; + + return NULL; +} + +static int bond_xdp_xmit(struct net_device *bond_dev, + int n, struct xdp_frame **frames, u32 flags) +{ + int nxmit, err = -ENXIO; + + rcu_read_lock(); + + for (nxmit = 0; nxmit < n; nxmit++) { + struct xdp_frame *frame = frames[nxmit]; + struct xdp_frame *frames1[] = {frame}; + struct net_device *slave_dev; + struct xdp_buff xdp; + + xdp_convert_frame_to_buff(frame, &xdp); + + slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); + if (!slave_dev) { + err = -ENXIO; + break; + } + + err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); + if (err < 1) + break; + } + + rcu_read_unlock(); + + /* If error happened on the first frame then we can pass the error up, otherwise + * report the number of frames that were xmitted. + */ + if (err < 0) + return (nxmit == 0 ? err : nxmit); + + return nxmit; +} + +static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, + struct netlink_ext_ack *extack) +{ + struct bonding *bond = netdev_priv(dev); + struct list_head *iter; + struct slave *slave, *rollback_slave; + struct bpf_prog *old_prog; + struct netdev_bpf xdp = { + .command = XDP_SETUP_PROG, + .flags = 0, + .prog = prog, + .extack = extack, + }; + int err; + + ASSERT_RTNL(); + + if (!bond_xdp_check(bond)) + return -EOPNOTSUPP; + + old_prog = bond->xdp_prog; + bond->xdp_prog = prog; + + bond_for_each_slave(bond, slave, iter) { + struct net_device *slave_dev = slave->dev; + + if (!slave_dev->netdev_ops->ndo_bpf || + !slave_dev->netdev_ops->ndo_xdp_xmit) { + SLAVE_NL_ERR(dev, slave_dev, extack, + "Slave device does not support XDP"); + err = -EOPNOTSUPP; + goto err; + } + + if (dev_xdp_prog_count(slave_dev) > 0) { + SLAVE_NL_ERR(dev, slave_dev, extack, + "Slave has XDP program loaded, please unload before enslaving"); + err = -EOPNOTSUPP; + goto err; + } + + err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); + if (err < 0) { + /* ndo_bpf() sets extack error message */ + slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); + goto err; + } + if (prog) + bpf_prog_inc(prog); + } + + if (prog) { + static_branch_inc(&bpf_master_redirect_enabled_key); + } else if (old_prog) { + bpf_prog_put(old_prog); + static_branch_dec(&bpf_master_redirect_enabled_key); + } + + return 0; + +err: + /* unwind the program changes */ + bond->xdp_prog = old_prog; + xdp.prog = old_prog; + xdp.extack = NULL; /* do not overwrite original error */ + + bond_for_each_slave(bond, rollback_slave, iter) { + struct net_device *slave_dev = rollback_slave->dev; + int err_unwind; + + if (slave == rollback_slave) + break; + + err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); + if (err_unwind < 0) + slave_err(dev, slave_dev, + "Error %d when unwinding XDP program change\n", err_unwind); + else if (xdp.prog) + bpf_prog_inc(xdp.prog); + } + return err; +} + +static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) +{ + switch (xdp->command) { + case XDP_SETUP_PROG: + return bond_xdp_set(dev, xdp->prog, xdp->extack); + default: + return -EINVAL; + } +} + +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) +{ + strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); + snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", + BOND_ABI_VERSION); +} + +static int bond_ethtool_get_ts_info(struct net_device *bond_dev, + struct ethtool_ts_info *info) +{ + struct bonding *bond = netdev_priv(bond_dev); + const struct ethtool_ops *ops; + struct net_device *real_dev; + struct phy_device *phydev; + int ret = 0; + + rcu_read_lock(); + real_dev = bond_option_active_slave_get_rcu(bond); + dev_hold(real_dev); + rcu_read_unlock(); + + if (real_dev) { + ops = real_dev->ethtool_ops; + phydev = real_dev->phydev; + + if (phy_has_tsinfo(phydev)) { + ret = phy_ts_info(phydev, info); + goto out; + } else if (ops->get_ts_info) { + ret = ops->get_ts_info(real_dev, info); + goto out; + } + } + + info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | + SOF_TIMESTAMPING_SOFTWARE; + info->phc_index = -1; + +out: + dev_put(real_dev); + return ret; +} + +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, + .get_ts_info = bond_ethtool_get_ts_info, +}; + +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_eth_ioctl = bond_eth_ioctl, + .ndo_siocbond = bond_do_ioctl, + .ndo_siocdevprivate = bond_siocdevprivate, + .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, + .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, + .ndo_bpf = bond_xdp, + .ndo_xdp_xmit = bond_xdp_xmit, + .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_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); + + if (bond->rr_tx_counter) + free_percpu(bond->rr_tx_counter); +} + +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; + 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 + bond_dev->hw_features |= BOND_XFRM_FEATURES; + /* Only enable XFRM features if this is an active-backup config */ + if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) + bond_dev->features |= BOND_XFRM_FEATURES; +#endif /* CONFIG_XFRM_OFFLOAD */ +#if IS_ENABLED(CONFIG_TLS_DEVICE) + if (bond_sk_check(bond)) + bond_dev->features |= BOND_TLS_FEATURES; +#endif +} + +/* 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->missed_max = 2; + params->updelay = updelay; + params->downdelay = downdelay; + params->peer_notif_delay = 0; + params->use_carrier = use_carrier; + params->lacp_active = 1; + 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) + strscpy_pad(params->primary, primary, sizeof(params->primary)); + + memcpy(params->arp_targets, arp_target, sizeof(arp_target)); +#if IS_ENABLED(CONFIG_IPV6) + memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); +#endif + + 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; + int res = -ENOMEM; + + rtnl_lock(); + + bond_dev = alloc_netdev_mq(sizeof(struct bonding), + name ? name : "bond%d", NET_NAME_UNKNOWN, + bond_setup, tx_queues); + if (!bond_dev) + goto out; + + bond = netdev_priv(bond_dev); + 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); + goto out; + } + + netif_carrier_off(bond_dev); + + bond_work_init_all(bond); + +out: + rtnl_unlock(); + return res; +} + +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_batch(struct list_head *net_list) +{ + struct bond_net *bn; + struct net *net; + LIST_HEAD(list); + + list_for_each_entry(net, net_list, exit_list) { + bn = net_generic(net, bond_net_id); + bond_destroy_sysfs(bn); + } + + /* Kill off any bonds created after unregistering bond rtnl ops */ + rtnl_lock(); + list_for_each_entry(net, net_list, exit_list) { + struct bonding *bond, *tmp_bond; + + bn = net_generic(net, bond_net_id); + 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(); + + list_for_each_entry(net, net_list, exit_list) { + bn = net_generic(net, bond_net_id); + bond_destroy_proc_dir(bn); + } +} + +static struct pernet_operations bond_net_ops = { + .init = bond_net_init, + .exit_batch = bond_net_exit_batch, + .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"); |