src/network/netdev/bridge.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <net/if.h>

#include "bridge.h"
#include "netlink-util.h"
#include "network-internal.h"
#include "networkd-manager.h"
#include "string-table.h"
#include "vlan-util.h"

static const char* const multicast_router_table[_MULTICAST_ROUTER_MAX] = {
        [MULTICAST_ROUTER_NONE] = "no",
        [MULTICAST_ROUTER_TEMPORARY_QUERY] = "query",
        [MULTICAST_ROUTER_PERMANENT] = "permanent",
        [MULTICAST_ROUTER_TEMPORARY] = "temporary",
};

DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(multicast_router, MulticastRouter, _MULTICAST_ROUTER_INVALID);
DEFINE_CONFIG_PARSE_ENUM(config_parse_multicast_router, multicast_router, MulticastRouter,
                         "Failed to parse bridge multicast router setting");

/* callback for bridge netdev's parameter set */
static int netdev_bridge_set_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
        int r;

        assert(netdev);
        assert(m);

        r = sd_netlink_message_get_errno(m);
        if (r < 0) {
                log_netdev_warning_errno(netdev, r, "Bridge parameters could not be set: %m");
                return 1;
        }

        log_netdev_debug(netdev, "Bridge parameters set success");

        return 1;
}

static int netdev_bridge_post_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
        Bridge *b;
        int r;

        assert(netdev);

        b = BRIDGE(netdev);

        assert(b);

        r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_NEWLINK, netdev->ifindex);
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");

        r = sd_netlink_message_set_flags(req, NLM_F_REQUEST | NLM_F_ACK);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not set netlink flags: %m");

        r = sd_netlink_message_open_container(req, IFLA_LINKINFO);
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");

        r = sd_netlink_message_open_container_union(req, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");

        /* convert to jiffes */
        if (b->forward_delay != USEC_INFINITY) {
                r = sd_netlink_message_append_u32(req, IFLA_BR_FORWARD_DELAY, usec_to_jiffies(b->forward_delay));
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_FORWARD_DELAY attribute: %m");
        }

        if (b->hello_time > 0) {
                r = sd_netlink_message_append_u32(req, IFLA_BR_HELLO_TIME, usec_to_jiffies(b->hello_time));
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_HELLO_TIME attribute: %m");
        }

        if (b->max_age > 0) {
                r = sd_netlink_message_append_u32(req, IFLA_BR_MAX_AGE, usec_to_jiffies(b->max_age));
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_MAX_AGE attribute: %m");
        }

        if (b->ageing_time != USEC_INFINITY) {
                r = sd_netlink_message_append_u32(req, IFLA_BR_AGEING_TIME, usec_to_jiffies(b->ageing_time));
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_AGEING_TIME attribute: %m");
        }

        if (b->priority > 0) {
                r = sd_netlink_message_append_u16(req, IFLA_BR_PRIORITY, b->priority);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_PRIORITY attribute: %m");
        }

        if (b->group_fwd_mask > 0) {
                r = sd_netlink_message_append_u16(req, IFLA_BR_GROUP_FWD_MASK, b->group_fwd_mask);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_GROUP_FWD_MASK attribute: %m");
        }

        if (b->default_pvid != VLANID_INVALID) {
                r = sd_netlink_message_append_u16(req, IFLA_BR_VLAN_DEFAULT_PVID, b->default_pvid);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_VLAN_DEFAULT_PVID attribute: %m");
        }

        if (b->mcast_querier >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BR_MCAST_QUERIER, b->mcast_querier);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_MCAST_QUERIER attribute: %m");
        }

        if (b->mcast_snooping >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BR_MCAST_SNOOPING, b->mcast_snooping);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_MCAST_SNOOPING attribute: %m");
        }

        if (b->vlan_filtering >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BR_VLAN_FILTERING, b->vlan_filtering);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_VLAN_FILTERING attribute: %m");
        }

        if (b->vlan_protocol >= 0) {
                r = sd_netlink_message_append_u16(req, IFLA_BR_VLAN_PROTOCOL, b->vlan_protocol);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_VLAN_PROTOCOL attribute: %m");
        }

        if (b->stp >= 0) {
                r = sd_netlink_message_append_u32(req, IFLA_BR_STP_STATE, b->stp);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_STP_STATE attribute: %m");
        }

        if (b->igmp_version > 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BR_MCAST_IGMP_VERSION, b->igmp_version);
                if (r < 0)
                        return log_netdev_error_errno(netdev, r, "Could not append IFLA_BR_MCAST_IGMP_VERSION attribute: %m");
        }

        r = sd_netlink_message_close_container(req);
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");

        r = sd_netlink_message_close_container(req);
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");

        r = netlink_call_async(netdev->manager->rtnl, NULL, req, netdev_bridge_set_handler,
                               netdev_destroy_callback, netdev);
        if (r < 0)
                return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");

        netdev_ref(netdev);

        return r;
}

static int link_set_bridge_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
        int r;

        assert(m);
        assert(link);
        assert(link->ifname);

        if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
                return 1;

        r = sd_netlink_message_get_errno(m);
        if (r < 0) {
                log_link_warning_errno(link, r, "Could not set bridge interface: %m");
                return 1;
        }

        return 1;
}

int link_set_bridge(Link *link) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
        int r;

        assert(link);
        assert(link->network);

        r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");

        r = sd_rtnl_message_link_set_family(req, PF_BRIDGE);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not set message family: %m");

        r = sd_netlink_message_open_container(req, IFLA_PROTINFO);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not append IFLA_PROTINFO attribute: %m");

        if (link->network->use_bpdu >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BRPORT_GUARD, link->network->use_bpdu);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_GUARD attribute: %m");
        }

        if (link->network->hairpin >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BRPORT_MODE, link->network->hairpin);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MODE attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_FAST_LEAVE attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROTECT attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_UNICAST_FLOOD attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_FLOOD attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MCAST_TO_UCAST attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_NEIGH_SUPPRESS attribute: %m");
        }

        if (link->network->learning >= 0) {
                r = sd_netlink_message_append_u8(req, IFLA_BRPORT_LEARNING, link->network->learning);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_LEARNING attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PROXYARP_WIFI attribute: %m");
        }

        if (link->network->cost != 0) {
                r = sd_netlink_message_append_u32(req, IFLA_BRPORT_COST, link->network->cost);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append IFLA_BRPORT_COST attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_PRIORITY attribute: %m");
        }

        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 log_link_error_errno(link, r, "Could not append IFLA_BRPORT_MULTICAST_ROUTER attribute: %m");
        }

        r = sd_netlink_message_close_container(req);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not append IFLA_LINKINFO attribute: %m");

        r = netlink_call_async(link->manager->rtnl, NULL, req, link_set_bridge_handler,
                               link_netlink_destroy_callback, link);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");

        link_ref(link);

        return r;
}

int config_parse_bridge_igmp_version(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        Bridge *b = userdata;
        uint8_t u;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (isempty(rvalue)) {
                b->igmp_version = 0; /* 0 means unset. */
                return 0;
        }

        r = safe_atou8(rvalue, &u);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Failed to parse bridge's multicast IGMP version number '%s', ignoring assignment: %m",
                           rvalue);
                return 0;
        }
        if (!IN_SET(u, 2, 3)) {
                log_syntax(unit, LOG_ERR, filename, line, 0,
                           "Invalid bridge's multicast IGMP version number '%s', ignoring assignment.", rvalue);
                return 0;
        }

        b->igmp_version = u;

        return 0;
}

static void bridge_init(NetDev *n) {
        Bridge *b;

        b = BRIDGE(n);

        assert(b);

        b->mcast_querier = -1;
        b->mcast_snooping = -1;
        b->vlan_filtering = -1;
        b->vlan_protocol = -1;
        b->stp = -1;
        b->default_pvid = VLANID_INVALID;
        b->forward_delay = USEC_INFINITY;
        b->ageing_time = USEC_INFINITY;
}

const NetDevVTable bridge_vtable = {
        .object_size = sizeof(Bridge),
        .init = bridge_init,
        .sections = NETDEV_COMMON_SECTIONS "Bridge\0",
        .post_create = netdev_bridge_post_create,
        .create_type = NETDEV_CREATE_MASTER,
};