diff options
Diffstat (limited to 'src/network/networkd-setlink.c')
| -rw-r--r-- | src/network/networkd-setlink.c | 1299 |
1 files changed, 1299 insertions, 0 deletions
diff --git a/src/network/networkd-setlink.c b/src/network/networkd-setlink.c new file mode 100644 index 0000000..0886ee9 --- /dev/null +++ b/src/network/networkd-setlink.c @@ -0,0 +1,1299 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netinet/in.h> +#include <linux/if.h> +#include <linux/if_arp.h> +#include <linux/if_bridge.h> + +#include "missing_network.h" +#include "netif-util.h" +#include "netlink-util.h" +#include "networkd-address.h" +#include "networkd-can.h" +#include "networkd-link.h" +#include "networkd-manager.h" +#include "networkd-queue.h" +#include "networkd-setlink.h" +#include "networkd-sriov.h" +#include "networkd-wiphy.h" + +static int get_link_default_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + return link_getlink_handler_internal(rtnl, m, link, "Failed to sync link information"); +} + +static int get_link_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + if (get_link_default_handler(rtnl, m, link) > 0) + link->master_set = true; + return 0; +} + +static int get_link_update_flag_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + assert(link); + assert(link->set_flags_messages > 0); + + link->set_flags_messages--; + + return get_link_default_handler(rtnl, m, link); +} + +static int set_link_handler_internal( + sd_netlink *rtnl, + sd_netlink_message *m, + Request *req, + Link *link, + bool ignore, + link_netlink_message_handler_t get_link_handler) { + + int r; + + assert(m); + assert(req); + assert(link); + + r = sd_netlink_message_get_errno(m); + if (r < 0) { + const char *error_msg; + + error_msg = strjoina("Failed to set ", request_type_to_string(req->type), ignore ? ", ignoring" : ""); + log_link_message_warning_errno(link, m, r, error_msg); + + if (!ignore) + link_enter_failed(link); + return 0; + } + + log_link_debug(link, "%s set.", request_type_to_string(req->type)); + + if (get_link_handler) { + r = link_call_getlink(link, get_link_handler); + if (r < 0) { + link_enter_failed(link); + return 0; + } + } + + if (link->set_link_messages == 0) + link_check_ready(link); + + return 1; +} + +static int link_set_addrgen_mode_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + int r; + + r = set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL); + if (r <= 0) + return r; + + r = link_drop_ipv6ll_addresses(link); + if (r < 0) { + log_link_warning_errno(link, r, "Failed to drop IPv6LL addresses: %m"); + link_enter_failed(link); + } + + return 0; +} + +static int link_set_bond_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL); +} + +static int link_set_bridge_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL); +} + +static int link_set_bridge_vlan_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL); +} + +static int link_set_can_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL); +} + +static int link_set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, get_link_default_handler); +} + +static int link_set_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, NULL); +} + +static int link_set_ipoib_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, NULL); +} + +static int link_set_mac_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_default_handler); +} + +static int link_set_mac_allow_retry_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + int r; + + assert(m); + assert(link); + + r = sd_netlink_message_get_errno(m); + if (r == -EBUSY) { + /* Most real network devices refuse to set its hardware address with -EBUSY when its + * operstate is not down. See, eth_prepare_mac_addr_change() in net/ethernet/eth.c + * of kernel. */ + + log_link_message_debug_errno(link, m, r, "Failed to set MAC address, retrying again: %m"); + + r = link_request_to_set_mac(link, /* allow_retry = */ false); + if (r < 0) + link_enter_failed(link); + + return 0; + } + + return link_set_mac_handler(rtnl, m, req, link, userdata); +} + +static int link_set_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ false, get_link_master_handler); +} + +static int link_unset_master_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + /* Some devices do not support setting master ifindex. Let's ignore error on unsetting master ifindex. */ + return set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_master_handler); +} + +static int link_set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + int r; + + r = set_link_handler_internal(rtnl, m, req, link, /* ignore = */ true, get_link_default_handler); + if (r <= 0) + return r; + + /* The kernel resets ipv6 mtu after changing device mtu; + * we must set this here, after we've set device mtu */ + r = link_set_ipv6_mtu(link); + if (r < 0) + log_link_warning_errno(link, r, "Failed to set IPv6 MTU, ignoring: %m"); + + return 0; +} + +static int link_configure_fill_message( + Link *link, + sd_netlink_message *req, + RequestType type, + void *userdata) { + int r; + + switch (type) { + case REQUEST_TYPE_SET_LINK_ADDRESS_GENERATION_MODE: + r = ipv6ll_addrgen_mode_fill_message(req, PTR_TO_UINT8(userdata)); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_BOND: + r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK); + if (r < 0) + return r; + + r = sd_netlink_message_open_container(req, IFLA_LINKINFO); + if (r < 0) + return r; + + r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, "bond"); + if (r < 0) + return r; + + if (link->network->active_slave) { + r = sd_netlink_message_append_u32(req, IFLA_BOND_ACTIVE_SLAVE, link->ifindex); + if (r < 0) + return r; + } + + if (link->network->primary_slave) { + r = sd_netlink_message_append_u32(req, IFLA_BOND_PRIMARY, link->ifindex); + if (r < 0) + return r; + } + + r = sd_netlink_message_close_container(req); + if (r < 0) + return r; + + r = sd_netlink_message_close_container(req); + if (r < 0) + return r; + + break; + case REQUEST_TYPE_SET_LINK_BRIDGE: + r = sd_rtnl_message_link_set_family(req, AF_BRIDGE); + if (r < 0) + return r; + + r = sd_netlink_message_open_container(req, IFLA_PROTINFO); + if (r < 0) + return r; + + if (link->network->use_bpdu >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, !link->network->use_bpdu); + if (r < 0) + return r; + } + + if (link->network->hairpin >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin); + if (r < 0) + return r; + } + + if (link->network->isolated >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_ISOLATED, link->network->isolated); + if (r < 0) + return r; + } + + if (link->network->fast_leave >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_FAST_LEAVE, link->network->fast_leave); + if (r < 0) + return r; + } + + if (link->network->allow_port_to_be_root >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROTECT, !link->network->allow_port_to_be_root); + if (r < 0) + return r; + } + + if (link->network->unicast_flood >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_UNICAST_FLOOD, link->network->unicast_flood); + if (r < 0) + return r; + } + + if (link->network->multicast_flood >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_FLOOD, link->network->multicast_flood); + if (r < 0) + return r; + } + + if (link->network->multicast_to_unicast >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MCAST_TO_UCAST, link->network->multicast_to_unicast); + if (r < 0) + return r; + } + + if (link->network->neighbor_suppression >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_NEIGH_SUPPRESS, link->network->neighbor_suppression); + if (r < 0) + return r; + } + + if (link->network->learning >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning); + if (r < 0) + return r; + } + + if (link->network->bridge_proxy_arp >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP, link->network->bridge_proxy_arp); + if (r < 0) + return r; + } + + if (link->network->bridge_proxy_arp_wifi >= 0) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_PROXYARP_WIFI, link->network->bridge_proxy_arp_wifi); + if (r < 0) + return r; + } + + if (link->network->cost != 0) { + r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost); + if (r < 0) + return r; + } + + if (link->network->priority != LINK_BRIDGE_PORT_PRIORITY_INVALID) { + r = sd_netlink_message_append_u16(req, IFLA_BRPORT_PRIORITY, link->network->priority); + if (r < 0) + return r; + } + + if (link->network->multicast_router != _MULTICAST_ROUTER_INVALID) { + r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MULTICAST_ROUTER, link->network->multicast_router); + if (r < 0) + return r; + } + + r = sd_netlink_message_close_container(req); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_BRIDGE_VLAN: + r = sd_rtnl_message_link_set_family(req, AF_BRIDGE); + if (r < 0) + return r; + + r = sd_netlink_message_open_container(req, IFLA_AF_SPEC); + if (r < 0) + return r; + + if (link->master_ifindex <= 0) { + /* master needs BRIDGE_FLAGS_SELF flag */ + r = sd_netlink_message_append_u16(req, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF); + if (r < 0) + return r; + } + + r = bridge_vlan_append_info(link, req, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap); + if (r < 0) + return r; + + r = sd_netlink_message_close_container(req); + if (r < 0) + return r; + + break; + case REQUEST_TYPE_SET_LINK_CAN: + r = can_set_netlink_message(link, req); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_FLAGS: { + unsigned ifi_change = 0, ifi_flags = 0; + + if (link->network->arp >= 0) { + ifi_change |= IFF_NOARP; + SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0); + } + + if (link->network->multicast >= 0) { + ifi_change |= IFF_MULTICAST; + SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast); + } + + if (link->network->allmulticast >= 0) { + ifi_change |= IFF_ALLMULTI; + SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast); + } + + if (link->network->promiscuous >= 0) { + ifi_change |= IFF_PROMISC; + SET_FLAG(ifi_flags, IFF_PROMISC, link->network->promiscuous); + } + + r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change); + if (r < 0) + return r; + + break; + } + case REQUEST_TYPE_SET_LINK_GROUP: + r = sd_netlink_message_append_u32(req, IFLA_GROUP, (uint32_t) link->network->group); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_MAC: + r = netlink_message_append_hw_addr(req, IFLA_ADDRESS, &link->requested_hw_addr); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_IPOIB: + r = ipoib_set_netlink_message(link, req); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_MASTER: + r = sd_netlink_message_append_u32(req, IFLA_MASTER, PTR_TO_UINT32(userdata)); + if (r < 0) + return r; + break; + case REQUEST_TYPE_SET_LINK_MTU: + r = sd_netlink_message_append_u32(req, IFLA_MTU, PTR_TO_UINT32(userdata)); + if (r < 0) + return r; + break; + default: + assert_not_reached(); + } + + return 0; +} + +static int link_configure(Link *link, Request *req) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + int r; + + assert(link); + assert(link->manager); + assert(req); + + log_link_debug(link, "Setting %s", request_type_to_string(req->type)); + + if (req->type == REQUEST_TYPE_SET_LINK_BOND) + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->master_ifindex); + else if (IN_SET(req->type, REQUEST_TYPE_SET_LINK_CAN, REQUEST_TYPE_SET_LINK_IPOIB)) + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, link->ifindex); + else + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_SETLINK, link->ifindex); + if (r < 0) + return r; + + r = link_configure_fill_message(link, m, req->type, req->userdata); + if (r < 0) + return r; + + return request_call_netlink_async(link->manager->rtnl, m, req); +} + +static bool netdev_is_ready(NetDev *netdev) { + assert(netdev); + + if (netdev->state != NETDEV_STATE_READY) + return false; + if (netdev->ifindex == 0) + return false; + + return true; +} + +static int link_is_ready_to_set_link(Link *link, Request *req) { + int r; + + assert(link); + assert(link->manager); + assert(link->network); + assert(req); + + if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) + return false; + + switch (req->type) { + case REQUEST_TYPE_SET_LINK_BOND: + case REQUEST_TYPE_SET_LINK_BRIDGE: + if (!link->master_set) + return false; + + if (link->network->keep_master && link->master_ifindex <= 0) + return false; + break; + + case REQUEST_TYPE_SET_LINK_BRIDGE_VLAN: + if (!link->master_set) + return false; + + if (link->network->keep_master && link->master_ifindex <= 0 && !streq_ptr(link->kind, "bridge")) + return false; + + break; + + case REQUEST_TYPE_SET_LINK_CAN: + /* Do not check link->set_flgas_messages here, as it is ok even if link->flags + * is outdated, and checking the counter causes a deadlock. */ + if (FLAGS_SET(link->flags, IFF_UP)) { + /* The CAN interface must be down to configure bitrate, etc... */ + r = link_down_now(link); + if (r < 0) + return r; + } + break; + + case REQUEST_TYPE_SET_LINK_MAC: + if (req->netlink_handler == link_set_mac_handler) { + /* This is the second attempt to set hardware address. On the first attempt + * req->netlink_handler points to link_set_mac_allow_retry_handler(). + * The first attempt failed as the interface was up. */ + r = link_down_now(link); + if (r < 0) + return r; + + /* If the kind of the link is "bond", we need + * set the slave link down as well. */ + if (streq_ptr(link->kind, "bond")) { + r = link_down_slave_links(link); + if (r < 0) + return r; + } + } + break; + + case REQUEST_TYPE_SET_LINK_MASTER: { + uint32_t m = 0; + Request req_mac = { + .link = link, + .type = REQUEST_TYPE_SET_LINK_MAC, + }; + + if (link->network->batadv) { + if (!netdev_is_ready(link->network->batadv)) + return false; + m = link->network->batadv->ifindex; + } else if (link->network->bond) { + if (ordered_set_contains(link->manager->request_queue, &req_mac)) + return false; + if (!netdev_is_ready(link->network->bond)) + return false; + m = link->network->bond->ifindex; + + /* Do not check link->set_flgas_messages here, as it is ok even if link->flags + * is outdated, and checking the counter causes a deadlock. */ + if (FLAGS_SET(link->flags, IFF_UP)) { + /* link must be down when joining to bond master. */ + r = link_down_now(link); + if (r < 0) + return r; + } + } else if (link->network->bridge) { + if (ordered_set_contains(link->manager->request_queue, &req_mac)) + return false; + if (!netdev_is_ready(link->network->bridge)) + return false; + m = link->network->bridge->ifindex; + } else if (link->network->vrf) { + if (!netdev_is_ready(link->network->vrf)) + return false; + m = link->network->vrf->ifindex; + } + + req->userdata = UINT32_TO_PTR(m); + break; + } + case REQUEST_TYPE_SET_LINK_MTU: { + if (ordered_set_contains(link->manager->request_queue, + &(const Request) { + .link = link, + .type = REQUEST_TYPE_SET_LINK_IPOIB, + })) + return false; + + /* Changing FD mode may affect MTU. */ + if (ordered_set_contains(link->manager->request_queue, + &(const Request) { + .link = link, + .type = REQUEST_TYPE_SET_LINK_CAN, + })) + return false; + } + default: + break; + } + + return true; +} + +static int link_process_set_link(Request *req, Link *link, void *userdata) { + int r; + + assert(req); + assert(link); + + r = link_is_ready_to_set_link(link, req); + if (r <= 0) + return r; + + r = link_configure(link, req); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to set %s", request_type_to_string(req->type)); + + return 1; +} + +static int link_request_set_link( + Link *link, + RequestType type, + request_netlink_handler_t netlink_handler, + Request **ret) { + + Request *req; + int r; + + assert(link); + + r = link_queue_request_full(link, type, NULL, NULL, NULL, NULL, + link_process_set_link, + &link->set_link_messages, + netlink_handler, + &req); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to request to set %s: %m", + request_type_to_string(type)); + + log_link_debug(link, "Requested to set %s", request_type_to_string(type)); + + if (ret) + *ret = req; + return 0; +} + +int link_request_to_set_addrgen_mode(Link *link) { + IPv6LinkLocalAddressGenMode mode; + Request *req; + int r; + + assert(link); + assert(link->network); + + if (!socket_ipv6_is_supported()) + return 0; + + mode = link_get_ipv6ll_addrgen_mode(link); + + if (mode == link->ipv6ll_address_gen_mode) + return 0; + + /* If the link is already up, then changing the mode by netlink does not take effect until the + * link goes down. Hence, we need to reset the interface. However, setting the mode by sysctl + * does not need that. Let's use the sysctl interface when the link is already up. + * See also issue #22424. */ + if (mode != IPV6_LINK_LOCAL_ADDRESSS_GEN_MODE_NONE && + FLAGS_SET(link->flags, IFF_UP)) { + r = link_set_ipv6ll_addrgen_mode(link, mode); + if (r < 0) + log_link_warning_errno(link, r, "Cannot set IPv6 address generation mode, ignoring: %m"); + + return 0; + } + + r = link_request_set_link(link, REQUEST_TYPE_SET_LINK_ADDRESS_GENERATION_MODE, + link_set_addrgen_mode_handler, + &req); + if (r < 0) + return r; + + req->userdata = UINT8_TO_PTR(mode); + return 0; +} + +int link_request_to_set_bond(Link *link) { + assert(link); + assert(link->network); + + if (!link->network->bond) { + Link *master; + + if (!link->network->keep_master) + return 0; + + if (link_get_master(link, &master) < 0) + return 0; + + if (!streq_ptr(master->kind, "bond")) + return 0; + } + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BOND, + link_set_bond_handler, NULL); +} + +int link_request_to_set_bridge(Link *link) { + assert(link); + assert(link->network); + + if (!link->network->bridge) { + Link *master; + + if (!link->network->keep_master) + return 0; + + if (link_get_master(link, &master) < 0) + return 0; + + if (!streq_ptr(master->kind, "bridge")) + return 0; + } + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BRIDGE, + link_set_bridge_handler, + NULL); +} + +int link_request_to_set_bridge_vlan(Link *link) { + assert(link); + assert(link->network); + + if (!link->network->use_br_vlan) + return 0; + + if (!link->network->bridge && !streq_ptr(link->kind, "bridge")) { + Link *master; + + if (!link->network->keep_master) + return 0; + + if (link_get_master(link, &master) < 0) + return 0; + + if (!streq_ptr(master->kind, "bridge")) + return 0; + } + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_BRIDGE_VLAN, + link_set_bridge_vlan_handler, + NULL); +} + +int link_request_to_set_can(Link *link) { + assert(link); + assert(link->network); + + if (link->iftype != ARPHRD_CAN) + return 0; + + if (!streq_ptr(link->kind, "can")) + return 0; + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_CAN, + link_set_can_handler, + NULL); +} + +int link_request_to_set_flags(Link *link) { + assert(link); + assert(link->network); + + if (link->network->arp < 0 && + link->network->multicast < 0 && + link->network->allmulticast < 0 && + link->network->promiscuous < 0) + return 0; + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_FLAGS, + link_set_flags_handler, + NULL); +} + +int link_request_to_set_group(Link *link) { + assert(link); + assert(link->network); + + if (link->network->group < 0) + return 0; + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_GROUP, + link_set_group_handler, + NULL); +} + +int link_request_to_set_mac(Link *link, bool allow_retry) { + int r; + + assert(link); + assert(link->network); + + if (link->network->hw_addr.length == 0) + return 0; + + link->requested_hw_addr = link->network->hw_addr; + r = net_verify_hardware_address(link->ifname, /* is_static = */ true, + link->iftype, &link->hw_addr, &link->requested_hw_addr); + if (r < 0) + return r; + + if (hw_addr_equal(&link->hw_addr, &link->requested_hw_addr)) + return 0; + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MAC, + allow_retry ? link_set_mac_allow_retry_handler : link_set_mac_handler, + NULL); +} + +int link_request_to_set_ipoib(Link *link) { + assert(link); + assert(link->network); + + if (link->iftype != ARPHRD_INFINIBAND) + return 0; + + if (link->network->ipoib_mode < 0 && + link->network->ipoib_umcast < 0) + return 0; + + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_IPOIB, + link_set_ipoib_handler, + NULL); +} + +int link_request_to_set_master(Link *link) { + assert(link); + assert(link->network); + + if (link->network->keep_master) { + /* When KeepMaster=yes, BatmanAdvanced=, Bond=, Bridge=, and VRF= are ignored. */ + link->master_set = true; + return 0; + + } else if (link->network->batadv || link->network->bond || link->network->bridge || link->network->vrf) { + link->master_set = false; + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MASTER, + link_set_master_handler, + NULL); + + } else if (link->master_ifindex != 0) { + /* Unset master only when it is set. */ + link->master_set = false; + return link_request_set_link(link, REQUEST_TYPE_SET_LINK_MASTER, + link_unset_master_handler, + NULL); + + } else { + /* Nothing we need to do. */ + link->master_set = true; + return 0; + } +} + +int link_request_to_set_mtu(Link *link, uint32_t mtu) { + const char *origin; + uint32_t min_mtu, max_mtu; + Request *req; + int r; + + assert(link); + assert(link->network); + + min_mtu = link->min_mtu; + origin = "the minimum MTU of the interface"; + if (link_ipv6_enabled(link)) { + /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes on the interface. Bump up + * MTU bytes to IPV6_MTU_MIN. */ + if (min_mtu < IPV6_MIN_MTU) { + min_mtu = IPV6_MIN_MTU; + origin = "the minimum IPv6 MTU"; + } + if (min_mtu < link->network->ipv6_mtu) { + min_mtu = link->network->ipv6_mtu; + origin = "the requested IPv6 MTU in IPv6MTUBytes="; + } + } + + if (mtu < min_mtu) { + log_link_warning(link, "Bumping the requested MTU %"PRIu32" to %s (%"PRIu32")", + mtu, origin, min_mtu); + mtu = min_mtu; + } + + max_mtu = link->max_mtu; + if (link->iftype == ARPHRD_CAN) + /* The maximum MTU may be changed when FD mode is changed. + * See https://docs.kernel.org/networking/can.html#can-fd-flexible-data-rate-driver-support + * MTU = 16 (CAN_MTU) => Classical CAN device + * MTU = 72 (CANFD_MTU) => CAN FD capable device + * So, even if the current maximum is 16, we should not reduce the requested value now. */ + max_mtu = MAX(max_mtu, 72u); + + if (mtu > max_mtu) { + log_link_warning(link, "Reducing the requested MTU %"PRIu32" to the interface's maximum MTU %"PRIu32".", + mtu, max_mtu); + mtu = max_mtu; + } + + if (link->mtu == mtu) + return 0; + + r = link_request_set_link(link, REQUEST_TYPE_SET_LINK_MTU, + link_set_mtu_handler, + &req); + if (r < 0) + return r; + + req->userdata = UINT32_TO_PTR(mtu); + return 0; +} + +static bool link_reduces_vlan_mtu(Link *link) { + /* See netif_reduces_vlan_mtu() in kernel. */ + return streq_ptr(link->kind, "macsec"); +} + +static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) { + uint32_t mtu = 0; + NetDev *dev; + + HASHMAP_FOREACH(dev, link->network->stacked_netdevs) + if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0) + /* See vlan_dev_change_mtu() in kernel. */ + mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu); + + else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu) + /* See macvlan_change_mtu() in kernel. */ + mtu = dev->mtu; + + return mtu; +} + +int link_configure_mtu(Link *link) { + uint32_t mtu; + + assert(link); + assert(link->network); + + if (link->network->mtu > 0) + return link_request_to_set_mtu(link, link->network->mtu); + + mtu = link_get_requested_mtu_by_stacked_netdevs(link); + if (link->mtu >= mtu) + return 0; + + log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. " + "If it is not desired, then please explicitly specify MTUBytes= setting.", + link->mtu, mtu); + + return link_request_to_set_mtu(link, mtu); +} + +static int link_up_dsa_slave(Link *link) { + Link *master; + int r; + + assert(link); + + /* For older kernels (specifically, older than 9d5ef190e5615a7b63af89f88c4106a5bc127974, kernel-5.12), + * it is necessary to bring up a DSA slave that its master interface is already up. And bringing up + * the slave fails with -ENETDOWN. So, let's bring up the master even if it is not managed by us, + * and try to bring up the slave after the master becomes up. */ + + if (link->dsa_master_ifindex <= 0) + return 0; + + if (!streq_ptr(link->driver, "dsa")) + return 0; + + if (link_get_by_index(link->manager, link->dsa_master_ifindex, &master) < 0) + return 0; + + if (master->state == LINK_STATE_UNMANAGED) { + /* If the DSA master interface is unmanaged, then it will never become up. + * Let's request to bring up the master. */ + r = link_request_to_bring_up_or_down(master, /* up = */ true); + if (r < 0) + return r; + } + + r = link_request_to_bring_up_or_down(link, /* up = */ true); + if (r < 0) + return r; + + return 1; +} + +static int link_up_or_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) { + bool on_activate, up; + int r; + + assert(m); + assert(req); + assert(link); + + on_activate = req->type == REQUEST_TYPE_ACTIVATE_LINK; + up = PTR_TO_INT(req->userdata); + + r = sd_netlink_message_get_errno(m); + if (r == -ENETDOWN && up && link_up_dsa_slave(link) > 0) + log_link_message_debug_errno(link, m, r, "Could not bring up dsa slave, retrying again after dsa master becomes up"); + else if (r < 0) + log_link_message_warning_errno(link, m, r, up ? + "Could not bring up interface, ignoring" : + "Could not bring down interface, ignoring"); + + r = link_call_getlink(link, get_link_update_flag_handler); + if (r < 0) { + link_enter_failed(link); + return 0; + } + + link->set_flags_messages++; + + if (on_activate) { + link->activated = true; + link_check_ready(link); + } + + return 0; +} + +static const char *up_or_down(bool up) { + return up ? "up" : "down"; +} + +static int link_up_or_down(Link *link, bool up, Request *req) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + assert(req); + + log_link_debug(link, "Bringing link %s", up_or_down(up)); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_SETLINK, link->ifindex); + if (r < 0) + return r; + + r = sd_rtnl_message_link_set_flags(m, up ? IFF_UP : 0, IFF_UP); + if (r < 0) + return r; + + return request_call_netlink_async(link->manager->rtnl, m, req); +} + +static bool link_is_ready_to_activate_one(Link *link, bool allow_unmanaged) { + assert(link); + + if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED)) + return false; + + if (!link->network) + return allow_unmanaged; + + if (link->set_link_messages > 0) + return false; + + return true; +} + + static bool link_is_ready_to_activate(Link *link, bool up) { + assert(link); + + if (!check_ready_for_all_sr_iov_ports(link, /* allow_unmanaged = */ false, + link_is_ready_to_activate_one)) + return false; + + if (up && link_rfkilled(link) > 0) + return false; + + return true; +} + +static int link_process_activation(Request *req, Link *link, void *userdata) { + bool up = PTR_TO_INT(userdata); + int r; + + assert(req); + assert(link); + + if (!link_is_ready_to_activate(link, up)) + return 0; + + r = link_up_or_down(link, up, req); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to activate link: %m"); + + return 1; +} + +int link_request_to_activate(Link *link) { + bool up; + int r; + + assert(link); + assert(link->network); + + switch (link->network->activation_policy) { + case ACTIVATION_POLICY_BOUND: + r = link_handle_bound_to_list(link); + if (r < 0) + return r; + _fallthrough_; + case ACTIVATION_POLICY_MANUAL: + link->activated = true; + link_check_ready(link); + return 0; + case ACTIVATION_POLICY_UP: + case ACTIVATION_POLICY_ALWAYS_UP: + up = true; + break; + case ACTIVATION_POLICY_DOWN: + case ACTIVATION_POLICY_ALWAYS_DOWN: + up = false; + break; + default: + assert_not_reached(); + } + + link->activated = false; + + r = link_queue_request_full(link, REQUEST_TYPE_ACTIVATE_LINK, + INT_TO_PTR(up), NULL, NULL, NULL, + link_process_activation, + &link->set_flags_messages, + link_up_or_down_handler, NULL); + if (r < 0) + return log_link_error_errno(link, r, "Failed to request to activate link: %m"); + + log_link_debug(link, "Requested to activate link"); + return 0; +} + +static bool link_is_ready_to_bring_up_or_down(Link *link, bool up) { + assert(link); + + if (up && link->dsa_master_ifindex > 0) { + Link *master; + + /* The master interface must be up. See comments in link_up_dsa_slave(). */ + + if (link_get_by_index(link->manager, link->dsa_master_ifindex, &master) < 0) + return false; + + if (!FLAGS_SET(master->flags, IFF_UP)) + return false; + } + + if (link->state == LINK_STATE_UNMANAGED) + return true; + + if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) + return false; + + if (link->set_link_messages > 0) + return false; + + if (!link->activated) + return false; + + if (up && link_rfkilled(link) > 0) + return false; + + return true; +} + +static int link_process_up_or_down(Request *req, Link *link, void *userdata) { + bool up = PTR_TO_INT(userdata); + int r; + + assert(req); + assert(link); + + if (!link_is_ready_to_bring_up_or_down(link, up)) + return 0; + + r = link_up_or_down(link, up, req); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to bring link %s: %m", up_or_down(up)); + + return 1; +} + +int link_request_to_bring_up_or_down(Link *link, bool up) { + int r; + + assert(link); + + r = link_queue_request_full(link, REQUEST_TYPE_UP_DOWN, + INT_TO_PTR(up), NULL, NULL, NULL, + link_process_up_or_down, + &link->set_flags_messages, + link_up_or_down_handler, NULL); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to request to bring link %s: %m", + up_or_down(up)); + + log_link_debug(link, "Requested to bring link %s", up_or_down(up)); + return 0; +} + +static int link_down_now_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(m); + assert(link); + assert(link->set_flags_messages > 0); + + link->set_flags_messages--; + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 0; + + r = sd_netlink_message_get_errno(m); + if (r < 0) + log_link_message_warning_errno(link, m, r, "Could not bring down interface, ignoring"); + + r = link_call_getlink(link, get_link_update_flag_handler); + if (r < 0) { + link_enter_failed(link); + return 0; + } + + link->set_flags_messages++; + return 0; +} + +int link_down_now(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + + log_link_debug(link, "Bringing link down"); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex); + if (r < 0) + return log_link_warning_errno(link, r, "Could not allocate RTM_SETLINK message: %m"); + + r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP); + if (r < 0) + return log_link_warning_errno(link, r, "Could not set link flags: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_down_now_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_warning_errno(link, r, "Could not send rtnetlink message: %m"); + + link->set_flags_messages++; + link_ref(link); + return 0; +} + +int link_down_slave_links(Link *link) { + Link *slave; + int r; + + assert(link); + + SET_FOREACH(slave, link->slaves) { + r = link_down_now(slave); + if (r < 0) + return r; + } + + return 0; +} + +static int link_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) { + int r; + + assert(m); + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 0; + + r = sd_netlink_message_get_errno(m); + if (r < 0) + log_link_message_warning_errno(link, m, r, "Could not remove interface, ignoring"); + + return 0; +} + +int link_remove(Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + + log_link_debug(link, "Removing link."); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_DELLINK, link->ifindex); + if (r < 0) + return log_link_debug_errno(link, r, "Could not allocate RTM_DELLINK message: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, req, link_remove_handler, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_debug_errno(link, r, "Could not send rtnetlink message: %m"); + + link_ref(link); + + return 0; +} |