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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "networkd.h" | |
23 | #include "net-util.h" | |
24 | #include "path-util.h" | |
25 | #include "conf-files.h" | |
26 | #include "conf-parser.h" | |
27 | #include "list.h" | |
28 | ||
29 | void bridge_free(Bridge *bridge) { | |
30 | bridge_join_callback *callback; | |
31 | ||
32 | if (!bridge) | |
33 | return; | |
34 | ||
35 | while ((callback = bridge->callbacks)) { | |
36 | LIST_REMOVE(callbacks, bridge->callbacks, callback); | |
37 | free(callback); | |
38 | } | |
39 | ||
40 | if (bridge->name) | |
41 | hashmap_remove(bridge->manager->bridges, bridge->name); | |
42 | ||
43 | free(bridge->filename); | |
44 | ||
45 | free(bridge->description); | |
46 | free(bridge->name); | |
47 | ||
48 | free(bridge); | |
49 | } | |
50 | ||
51 | int bridge_get(Manager *manager, const char *name, Bridge **ret) { | |
52 | Bridge *bridge; | |
53 | ||
54 | assert(manager); | |
55 | assert(name); | |
56 | assert(ret); | |
57 | ||
58 | if (manager_should_reload(manager)) | |
59 | manager_load_config(manager); | |
60 | ||
61 | bridge = hashmap_get(manager->bridges, name); | |
62 | if (!bridge) { | |
63 | *ret = NULL; | |
64 | return -ENOENT; | |
65 | } | |
66 | ||
67 | *ret = bridge; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static int bridge_enter_failed(Bridge *bridge) { | |
73 | bridge->state = BRIDGE_STATE_FAILED; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static int bridge_join_ready(Bridge *bridge, Link* link, sd_rtnl_message_handler_t callback) { | |
79 | _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; | |
80 | int r; | |
81 | ||
82 | assert(bridge); | |
83 | assert(bridge->state == BRIDGE_STATE_READY); | |
84 | assert(link); | |
85 | assert(callback); | |
86 | ||
87 | r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, 0, 0, &req); | |
88 | if (r < 0) { | |
89 | log_error("Could not allocate RTM_SETLINK message: %s", | |
90 | strerror(-r)); | |
91 | return r; | |
92 | } | |
93 | ||
94 | r = sd_rtnl_message_append(req, IFLA_MASTER, &bridge->link->ifindex); | |
95 | if (r < 0) { | |
96 | log_error("Could not append IFLA_MASTER attribute: %s", | |
97 | strerror(-r)); | |
98 | return r; | |
99 | } | |
100 | ||
101 | r = sd_rtnl_call_async(bridge->manager->rtnl, req, callback, link, 0, NULL); | |
102 | if (r < 0) { | |
103 | log_error("Could not send rtnetlink message: %s", strerror(-r)); | |
104 | return r; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int bridge_enter_ready(Bridge *bridge) { | |
111 | bridge_join_callback *callback; | |
112 | ||
113 | bridge->state = BRIDGE_STATE_READY; | |
114 | ||
115 | log_info("Bridge '%s' ready", bridge->name); | |
116 | ||
117 | LIST_FOREACH(callbacks, callback, bridge->callbacks) { | |
118 | /* join the links that were attempted to be joined befor the | |
119 | * link was ready */ | |
120 | bridge_join_ready(bridge, callback->link, callback->callback); | |
121 | } | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static int bridge_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { | |
127 | Bridge *bridge = userdata; | |
128 | int r; | |
129 | ||
130 | assert(bridge->state == BRIDGE_STATE_CREATING); | |
131 | ||
132 | r = sd_rtnl_message_get_errno(m); | |
133 | if (r < 0) { | |
134 | log_warning("Bridge '%s' failed: %s", bridge->name, strerror(-r)); | |
135 | return bridge_enter_failed(bridge); | |
136 | } | |
137 | ||
138 | if (bridge->link) | |
139 | return bridge_enter_ready(bridge); | |
140 | ||
141 | bridge->state = BRIDGE_STATE_CREATED; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int bridge_create(Bridge *bridge) { | |
147 | _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; | |
148 | int r; | |
149 | ||
150 | assert(bridge); | |
151 | assert(bridge->state == _BRIDGE_STATE_INVALID); | |
152 | assert(bridge->name); | |
153 | assert(bridge->manager); | |
154 | assert(bridge->manager->rtnl); | |
155 | ||
156 | r = sd_rtnl_message_link_new(RTM_NEWLINK, 0, 0, 0, &req); | |
157 | if (r < 0) { | |
158 | log_error("Could not allocate RTM_NEWLINK message: %s", | |
159 | strerror(-r)); | |
160 | return r; | |
161 | } | |
162 | ||
163 | r = sd_rtnl_message_append(req, IFLA_IFNAME, bridge->name); | |
164 | if (r < 0) { | |
165 | log_error("Could not append IFLA_IFNAME attribute: %s", | |
166 | strerror(-r)); | |
167 | return r; | |
168 | } | |
169 | ||
170 | r = sd_rtnl_message_open_container(req, IFLA_LINKINFO); | |
171 | if (r < 0) { | |
172 | log_error("Colud not open IFLA_LINKINFO container: %s", | |
173 | strerror(-r)); | |
174 | return r; | |
175 | } | |
176 | ||
177 | r = sd_rtnl_message_append(req, IFLA_INFO_KIND, "bridge"); | |
178 | if (r < 0) { | |
179 | log_error("Could not append IFLA_INFO_KIND attribute: %s", | |
180 | strerror(-r)); | |
181 | return r; | |
182 | } | |
183 | ||
184 | r = sd_rtnl_message_close_container(req); | |
185 | if (r < 0) { | |
186 | log_error("Could not close IFLA_LINKINFO container %s", | |
187 | strerror(-r)); | |
188 | return r; | |
189 | } | |
190 | ||
191 | r = sd_rtnl_call_async(bridge->manager->rtnl, req, &bridge_create_handler, bridge, 0, NULL); | |
192 | if (r < 0) { | |
193 | log_error("Could not send rtnetlink message: %s", strerror(-r)); | |
194 | return r; | |
195 | } | |
196 | ||
197 | log_info("Creating bridge '%s'", bridge->name); | |
198 | ||
199 | bridge->state = BRIDGE_STATE_CREATING; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | int bridge_join(Bridge *bridge, Link *link, sd_rtnl_message_handler_t callback) { | |
02b59d57 TG |
205 | if (bridge->state == BRIDGE_STATE_READY) { |
206 | bridge_join_ready(bridge, link, callback); | |
207 | } else { | |
208 | /* the bridge is not yet read, save this request for when it is*/ | |
209 | bridge_join_callback *cb; | |
210 | ||
211 | cb = new0(bridge_join_callback, 1); | |
212 | if (!cb) | |
213 | return log_oom(); | |
214 | ||
215 | cb->callback = callback; | |
216 | cb->link = link; | |
217 | ||
218 | LIST_PREPEND(callbacks, bridge->callbacks, cb); | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | int bridge_set_link(Manager *m, Link *link) { | |
225 | Bridge *bridge; | |
226 | ||
227 | bridge = hashmap_get(m->bridges, link->ifname); | |
228 | if (!bridge) | |
229 | return -ENOENT; | |
230 | ||
231 | if (bridge->link && bridge->link != link) | |
232 | return -EEXIST; | |
233 | ||
234 | bridge->link = link; | |
235 | ||
236 | if (bridge->state == BRIDGE_STATE_CREATED) | |
237 | bridge_enter_ready(bridge); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int bridge_load_one(Manager *manager, const char *filename) { | |
243 | _cleanup_bridge_free_ Bridge *bridge = NULL; | |
244 | _cleanup_fclose_ FILE *file = NULL; | |
245 | int r; | |
246 | ||
247 | file = fopen(filename, "re"); | |
248 | if (!file) { | |
249 | if (errno == ENOENT) | |
250 | return 0; | |
251 | else | |
252 | return errno; | |
253 | } | |
254 | ||
255 | bridge = new0(Bridge, 1); | |
256 | if (!bridge) | |
257 | return log_oom(); | |
258 | ||
259 | bridge->manager = manager; | |
260 | bridge->state = _BRIDGE_STATE_INVALID; | |
261 | ||
262 | r = config_parse(NULL, filename, file, "Bridge\0", config_item_perf_lookup, | |
263 | (void*) network_gperf_lookup, false, false, bridge); | |
264 | if (r < 0) { | |
265 | log_warning("Could not parse config file %s: %s", filename, strerror(-r)); | |
266 | return r; | |
267 | } else | |
268 | log_debug("Parsed configuration file %s", filename); | |
269 | ||
270 | if (!bridge->name) { | |
271 | log_warning("Bridge without Name configured in %s. Ignoring", filename); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | bridge->filename = strdup(filename); | |
276 | if (!bridge->filename) | |
277 | return log_oom(); | |
278 | ||
279 | r = hashmap_put(bridge->manager->bridges, bridge->name, bridge); | |
280 | if (r < 0) | |
281 | return r; | |
282 | ||
283 | LIST_HEAD_INIT(bridge->callbacks); | |
284 | ||
285 | r = bridge_create(bridge); | |
286 | if (r < 0) | |
287 | return r; | |
288 | ||
289 | bridge = NULL; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | int bridge_load(Manager *manager) { | |
295 | Bridge *bridge; | |
296 | char **files, **f; | |
297 | int r; | |
298 | ||
299 | assert(manager); | |
300 | ||
301 | while ((bridge = hashmap_first(manager->bridges))) | |
302 | bridge_free(bridge); | |
303 | ||
304 | r = conf_files_list_strv(&files, ".netdev", NULL, (const char **)manager->network_dirs); | |
305 | if (r < 0) { | |
306 | log_error("Failed to enumerate netdev files: %s", strerror(-r)); | |
307 | return r; | |
308 | } | |
309 | ||
310 | STRV_FOREACH_BACKWARDS(f, files) { | |
311 | r = bridge_load_one(manager, *f); | |
312 | if (r < 0) | |
313 | return r; | |
314 | } | |
315 | ||
316 | strv_free(files); | |
317 | ||
318 | return 0; | |
319 | } |