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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 | ||
fc25d7f8 | 87 | r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req); |
02b59d57 TG |
88 | if (r < 0) { |
89 | log_error("Could not allocate RTM_SETLINK message: %s", | |
90 | strerror(-r)); | |
91 | return r; | |
92 | } | |
93 | ||
0a0dc69b | 94 | r = sd_rtnl_message_append_u32(req, IFLA_MASTER, bridge->link->ifindex); |
02b59d57 TG |
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)); | |
dd3efc09 TG |
135 | bridge_enter_failed(bridge); |
136 | ||
137 | return 1; | |
02b59d57 TG |
138 | } |
139 | ||
140 | if (bridge->link) | |
dd3efc09 | 141 | bridge_enter_ready(bridge); |
d638dee0 TG |
142 | else |
143 | bridge->state = BRIDGE_STATE_CREATED; | |
02b59d57 | 144 | |
dd3efc09 | 145 | return 1; |
02b59d57 TG |
146 | } |
147 | ||
148 | static int bridge_create(Bridge *bridge) { | |
149 | _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; | |
150 | int r; | |
151 | ||
152 | assert(bridge); | |
153 | assert(bridge->state == _BRIDGE_STATE_INVALID); | |
154 | assert(bridge->name); | |
155 | assert(bridge->manager); | |
156 | assert(bridge->manager->rtnl); | |
157 | ||
fc25d7f8 | 158 | r = sd_rtnl_message_link_new(RTM_NEWLINK, 0, &req); |
02b59d57 TG |
159 | if (r < 0) { |
160 | log_error("Could not allocate RTM_NEWLINK message: %s", | |
161 | strerror(-r)); | |
162 | return r; | |
163 | } | |
164 | ||
0a0dc69b | 165 | r = sd_rtnl_message_append_string(req, IFLA_IFNAME, bridge->name); |
02b59d57 TG |
166 | if (r < 0) { |
167 | log_error("Could not append IFLA_IFNAME attribute: %s", | |
168 | strerror(-r)); | |
169 | return r; | |
170 | } | |
171 | ||
172 | r = sd_rtnl_message_open_container(req, IFLA_LINKINFO); | |
173 | if (r < 0) { | |
174 | log_error("Colud not open IFLA_LINKINFO container: %s", | |
175 | strerror(-r)); | |
176 | return r; | |
177 | } | |
178 | ||
0a0dc69b | 179 | r = sd_rtnl_message_append_string(req, IFLA_INFO_KIND, "bridge"); |
02b59d57 TG |
180 | if (r < 0) { |
181 | log_error("Could not append IFLA_INFO_KIND attribute: %s", | |
182 | strerror(-r)); | |
183 | return r; | |
184 | } | |
185 | ||
186 | r = sd_rtnl_message_close_container(req); | |
187 | if (r < 0) { | |
188 | log_error("Could not close IFLA_LINKINFO container %s", | |
189 | strerror(-r)); | |
190 | return r; | |
191 | } | |
192 | ||
193 | r = sd_rtnl_call_async(bridge->manager->rtnl, req, &bridge_create_handler, bridge, 0, NULL); | |
194 | if (r < 0) { | |
195 | log_error("Could not send rtnetlink message: %s", strerror(-r)); | |
196 | return r; | |
197 | } | |
198 | ||
199 | log_info("Creating bridge '%s'", bridge->name); | |
200 | ||
201 | bridge->state = BRIDGE_STATE_CREATING; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | int bridge_join(Bridge *bridge, Link *link, sd_rtnl_message_handler_t callback) { | |
02b59d57 TG |
207 | if (bridge->state == BRIDGE_STATE_READY) { |
208 | bridge_join_ready(bridge, link, callback); | |
209 | } else { | |
210 | /* the bridge is not yet read, save this request for when it is*/ | |
211 | bridge_join_callback *cb; | |
212 | ||
213 | cb = new0(bridge_join_callback, 1); | |
214 | if (!cb) | |
215 | return log_oom(); | |
216 | ||
217 | cb->callback = callback; | |
218 | cb->link = link; | |
219 | ||
220 | LIST_PREPEND(callbacks, bridge->callbacks, cb); | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | int bridge_set_link(Manager *m, Link *link) { | |
227 | Bridge *bridge; | |
228 | ||
229 | bridge = hashmap_get(m->bridges, link->ifname); | |
230 | if (!bridge) | |
231 | return -ENOENT; | |
232 | ||
233 | if (bridge->link && bridge->link != link) | |
234 | return -EEXIST; | |
235 | ||
236 | bridge->link = link; | |
237 | ||
238 | if (bridge->state == BRIDGE_STATE_CREATED) | |
239 | bridge_enter_ready(bridge); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int bridge_load_one(Manager *manager, const char *filename) { | |
245 | _cleanup_bridge_free_ Bridge *bridge = NULL; | |
246 | _cleanup_fclose_ FILE *file = NULL; | |
247 | int r; | |
248 | ||
bf1bc670 TA |
249 | assert(manager); |
250 | assert(filename); | |
251 | ||
02b59d57 TG |
252 | file = fopen(filename, "re"); |
253 | if (!file) { | |
254 | if (errno == ENOENT) | |
255 | return 0; | |
256 | else | |
257 | return errno; | |
258 | } | |
259 | ||
260 | bridge = new0(Bridge, 1); | |
261 | if (!bridge) | |
262 | return log_oom(); | |
263 | ||
264 | bridge->manager = manager; | |
265 | bridge->state = _BRIDGE_STATE_INVALID; | |
266 | ||
267 | r = config_parse(NULL, filename, file, "Bridge\0", config_item_perf_lookup, | |
268 | (void*) network_gperf_lookup, false, false, bridge); | |
269 | if (r < 0) { | |
270 | log_warning("Could not parse config file %s: %s", filename, strerror(-r)); | |
271 | return r; | |
272 | } else | |
273 | log_debug("Parsed configuration file %s", filename); | |
274 | ||
275 | if (!bridge->name) { | |
276 | log_warning("Bridge without Name configured in %s. Ignoring", filename); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | bridge->filename = strdup(filename); | |
281 | if (!bridge->filename) | |
282 | return log_oom(); | |
283 | ||
284 | r = hashmap_put(bridge->manager->bridges, bridge->name, bridge); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
288 | LIST_HEAD_INIT(bridge->callbacks); | |
289 | ||
290 | r = bridge_create(bridge); | |
291 | if (r < 0) | |
292 | return r; | |
293 | ||
294 | bridge = NULL; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | int bridge_load(Manager *manager) { | |
300 | Bridge *bridge; | |
301 | char **files, **f; | |
302 | int r; | |
303 | ||
304 | assert(manager); | |
305 | ||
306 | while ((bridge = hashmap_first(manager->bridges))) | |
307 | bridge_free(bridge); | |
308 | ||
309 | r = conf_files_list_strv(&files, ".netdev", NULL, (const char **)manager->network_dirs); | |
310 | if (r < 0) { | |
311 | log_error("Failed to enumerate netdev files: %s", strerror(-r)); | |
312 | return r; | |
313 | } | |
314 | ||
315 | STRV_FOREACH_BACKWARDS(f, files) { | |
316 | r = bridge_load_one(manager, *f); | |
317 | if (r < 0) | |
318 | return r; | |
319 | } | |
320 | ||
321 | strv_free(files); | |
322 | ||
323 | return 0; | |
324 | } |