/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Tom Gundersen <teg@jklm.no> systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include "networkd.h" #include "net-util.h" #include "path-util.h" #include "conf-files.h" #include "conf-parser.h" #include "list.h" void bridge_free(Bridge *bridge) { bridge_join_callback *callback; if (!bridge) return; while ((callback = bridge->callbacks)) { LIST_REMOVE(callbacks, bridge->callbacks, callback); free(callback); } if (bridge->name) hashmap_remove(bridge->manager->bridges, bridge->name); free(bridge->filename); free(bridge->description); free(bridge->name); free(bridge); } int bridge_get(Manager *manager, const char *name, Bridge **ret) { Bridge *bridge; assert(manager); assert(name); assert(ret); if (manager_should_reload(manager)) manager_load_config(manager); bridge = hashmap_get(manager->bridges, name); if (!bridge) { *ret = NULL; return -ENOENT; } *ret = bridge; return 0; } static int bridge_enter_failed(Bridge *bridge) { bridge->state = BRIDGE_STATE_FAILED; return 0; } static int bridge_join_ready(Bridge *bridge, Link* link, sd_rtnl_message_handler_t callback) { _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(bridge); assert(bridge->state == BRIDGE_STATE_READY); assert(link); assert(callback); r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req); if (r < 0) { log_error("Could not allocate RTM_SETLINK message: %s", strerror(-r)); return r; } r = sd_rtnl_message_append_u32(req, IFLA_MASTER, bridge->link->ifindex); if (r < 0) { log_error("Could not append IFLA_MASTER attribute: %s", strerror(-r)); return r; } r = sd_rtnl_call_async(bridge->manager->rtnl, req, callback, link, 0, NULL); if (r < 0) { log_error("Could not send rtnetlink message: %s", strerror(-r)); return r; } return 0; } static int bridge_enter_ready(Bridge *bridge) { bridge_join_callback *callback; bridge->state = BRIDGE_STATE_READY; log_info("Bridge '%s' ready", bridge->name); LIST_FOREACH(callbacks, callback, bridge->callbacks) { /* join the links that were attempted to be joined befor the * link was ready */ bridge_join_ready(bridge, callback->link, callback->callback); } return 0; } static int bridge_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Bridge *bridge = userdata; int r; assert(bridge->state == BRIDGE_STATE_CREATING); r = sd_rtnl_message_get_errno(m); if (r < 0) { log_warning("Bridge '%s' failed: %s", bridge->name, strerror(-r)); bridge_enter_failed(bridge); return 1; } if (bridge->link) bridge_enter_ready(bridge); else bridge->state = BRIDGE_STATE_CREATED; return 1; } static int bridge_create(Bridge *bridge) { _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(bridge); assert(bridge->state == _BRIDGE_STATE_INVALID); assert(bridge->name); assert(bridge->manager); assert(bridge->manager->rtnl); r = sd_rtnl_message_link_new(RTM_NEWLINK, 0, &req); if (r < 0) { log_error("Could not allocate RTM_NEWLINK message: %s", strerror(-r)); return r; } r = sd_rtnl_message_append_string(req, IFLA_IFNAME, bridge->name); if (r < 0) { log_error("Could not append IFLA_IFNAME attribute: %s", strerror(-r)); return r; } r = sd_rtnl_message_open_container(req, IFLA_LINKINFO); if (r < 0) { log_error("Colud not open IFLA_LINKINFO container: %s", strerror(-r)); return r; } r = sd_rtnl_message_append_string(req, IFLA_INFO_KIND, "bridge"); if (r < 0) { log_error("Could not append IFLA_INFO_KIND attribute: %s", strerror(-r)); return r; } r = sd_rtnl_message_close_container(req); if (r < 0) { log_error("Could not close IFLA_LINKINFO container %s", strerror(-r)); return r; } r = sd_rtnl_call_async(bridge->manager->rtnl, req, &bridge_create_handler, bridge, 0, NULL); if (r < 0) { log_error("Could not send rtnetlink message: %s", strerror(-r)); return r; } log_info("Creating bridge '%s'", bridge->name); bridge->state = BRIDGE_STATE_CREATING; return 0; } int bridge_join(Bridge *bridge, Link *link, sd_rtnl_message_handler_t callback) { if (bridge->state == BRIDGE_STATE_READY) { bridge_join_ready(bridge, link, callback); } else { /* the bridge is not yet read, save this request for when it is*/ bridge_join_callback *cb; cb = new0(bridge_join_callback, 1); if (!cb) return log_oom(); cb->callback = callback; cb->link = link; LIST_PREPEND(callbacks, bridge->callbacks, cb); } return 0; } int bridge_set_link(Manager *m, Link *link) { Bridge *bridge; bridge = hashmap_get(m->bridges, link->ifname); if (!bridge) return -ENOENT; if (bridge->link && bridge->link != link) return -EEXIST; bridge->link = link; if (bridge->state == BRIDGE_STATE_CREATED) bridge_enter_ready(bridge); return 0; } static int bridge_load_one(Manager *manager, const char *filename) { _cleanup_bridge_free_ Bridge *bridge = NULL; _cleanup_fclose_ FILE *file = NULL; int r; assert(manager); assert(filename); file = fopen(filename, "re"); if (!file) { if (errno == ENOENT) return 0; else return errno; } bridge = new0(Bridge, 1); if (!bridge) return log_oom(); bridge->manager = manager; bridge->state = _BRIDGE_STATE_INVALID; r = config_parse(NULL, filename, file, "Bridge\0", config_item_perf_lookup, (void*) network_gperf_lookup, false, false, bridge); if (r < 0) { log_warning("Could not parse config file %s: %s", filename, strerror(-r)); return r; } else log_debug("Parsed configuration file %s", filename); if (!bridge->name) { log_warning("Bridge without Name configured in %s. Ignoring", filename); return 0; } bridge->filename = strdup(filename); if (!bridge->filename) return log_oom(); r = hashmap_put(bridge->manager->bridges, bridge->name, bridge); if (r < 0) return r; LIST_HEAD_INIT(bridge->callbacks); r = bridge_create(bridge); if (r < 0) return r; bridge = NULL; return 0; } int bridge_load(Manager *manager) { Bridge *bridge; char **files, **f; int r; assert(manager); while ((bridge = hashmap_first(manager->bridges))) bridge_free(bridge); r = conf_files_list_strv(&files, ".netdev", NULL, (const char **)manager->network_dirs); if (r < 0) { log_error("Failed to enumerate netdev files: %s", strerror(-r)); return r; } STRV_FOREACH_BACKWARDS(f, files) { r = bridge_load_one(manager, *f); if (r < 0) return r; } strv_free(files); return 0; }