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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
7de12ae7 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2013 Tom Gundersen <teg@jklm.no> |
7de12ae7 TG |
4 | ***/ |
5 | ||
6 | #include <netinet/ether.h> | |
7 | #include <linux/if.h> | |
5d8689d7 | 8 | #include <fnmatch.h> |
7de12ae7 | 9 | |
b5efdb8a | 10 | #include "alloc-util.h" |
c5fcf6e4 TG |
11 | #include "link.h" |
12 | #include "manager.h" | |
1c4baffc | 13 | #include "netlink-util.h" |
7de12ae7 | 14 | #include "network-internal.h" |
e56cdb7a | 15 | #include "time-util.h" |
b5efdb8a | 16 | #include "util.h" |
7de12ae7 | 17 | |
79b1f37d TG |
18 | bool manager_ignore_link(Manager *m, Link *link) { |
19 | assert(m); | |
20 | assert(link); | |
21 | ||
be0c1370 | 22 | /* always ignore the loopback interface */ |
79b1f37d TG |
23 | if (link->flags & IFF_LOOPBACK) |
24 | return true; | |
25 | ||
be0c1370 TG |
26 | /* if interfaces are given on the command line, ignore all others */ |
27 | if (m->interfaces && !strv_contains(m->interfaces, link->ifname)) | |
28 | return true; | |
29 | ||
c1a38904 MTL |
30 | if (!link->required_for_online) |
31 | return true; | |
32 | ||
be0c1370 | 33 | /* ignore interfaces we explicitly are asked to ignore */ |
03fb3334 | 34 | return strv_fnmatch(m->ignore, link->ifname, 0); |
79b1f37d TG |
35 | } |
36 | ||
7de12ae7 TG |
37 | bool manager_all_configured(Manager *m) { |
38 | Iterator i; | |
39 | Link *l; | |
40 | char **ifname; | |
41 | bool one_ready = false; | |
42 | ||
3f85ef0f | 43 | /* wait for all the links given on the command line to appear */ |
7de12ae7 TG |
44 | STRV_FOREACH(ifname, m->interfaces) { |
45 | l = hashmap_get(m->links_by_name, *ifname); | |
46 | if (!l) { | |
47 | log_debug("still waiting for %s", *ifname); | |
48 | return false; | |
49 | } | |
50 | } | |
51 | ||
52 | /* wait for all links networkd manages to be in admin state 'configured' | |
53 | and at least one link to gain a carrier */ | |
54 | HASHMAP_FOREACH(l, m->links, i) { | |
79b1f37d TG |
55 | if (manager_ignore_link(m, l)) { |
56 | log_info("ignoring: %s", l->ifname); | |
7de12ae7 TG |
57 | continue; |
58 | } | |
59 | ||
60 | if (!l->state) { | |
61 | log_debug("link %s has not yet been processed by udev", | |
62 | l->ifname); | |
63 | return false; | |
64 | } | |
65 | ||
79ac8ba9 | 66 | if (STR_IN_SET(l->state, "configuring", "pending")) { |
7de12ae7 TG |
67 | log_debug("link %s is being processed by networkd", |
68 | l->ifname); | |
69 | return false; | |
70 | } | |
71 | ||
72 | if (l->operational_state && | |
73 | STR_IN_SET(l->operational_state, "degraded", "routable")) | |
74 | /* we wait for at least one link to be ready, | |
75 | regardless of who manages it */ | |
76 | one_ready = true; | |
77 | } | |
78 | ||
79 | return one_ready; | |
80 | } | |
81 | ||
1c4baffc | 82 | static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
7de12ae7 TG |
83 | Manager *m = userdata; |
84 | uint16_t type; | |
85 | Link *l; | |
d2437732 | 86 | const char *ifname; |
7de12ae7 TG |
87 | int ifindex, r; |
88 | ||
89 | assert(rtnl); | |
90 | assert(m); | |
91 | assert(mm); | |
92 | ||
1c4baffc | 93 | r = sd_netlink_message_get_type(mm, &type); |
7de12ae7 TG |
94 | if (r < 0) |
95 | goto fail; | |
96 | ||
97 | r = sd_rtnl_message_link_get_ifindex(mm, &ifindex); | |
98 | if (r < 0) | |
99 | goto fail; | |
100 | ||
1c4baffc | 101 | r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname); |
7de12ae7 TG |
102 | if (r < 0) |
103 | goto fail; | |
104 | ||
105 | l = hashmap_get(m->links, INT_TO_PTR(ifindex)); | |
106 | ||
107 | switch (type) { | |
108 | ||
109 | case RTM_NEWLINK: | |
110 | if (!l) { | |
111 | log_debug("Found link %i", ifindex); | |
112 | ||
113 | r = link_new(m, &l, ifindex, ifname); | |
114 | if (r < 0) | |
115 | goto fail; | |
116 | ||
117 | r = link_update_monitor(l); | |
118 | if (r < 0) | |
119 | goto fail; | |
120 | } | |
121 | ||
122 | r = link_update_rtnl(l, mm); | |
123 | if (r < 0) | |
124 | goto fail; | |
125 | ||
126 | break; | |
127 | ||
128 | case RTM_DELLINK: | |
129 | if (l) { | |
130 | log_debug("Removing link %i", l->ifindex); | |
131 | link_free(l); | |
132 | } | |
133 | ||
134 | break; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | ||
139 | fail: | |
da927ba9 | 140 | log_warning_errno(r, "Failed to process RTNL link message: %m"); |
7de12ae7 TG |
141 | return 0; |
142 | } | |
143 | ||
1c4baffc | 144 | static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) { |
7de12ae7 TG |
145 | Manager *m = userdata; |
146 | int r; | |
147 | ||
148 | r = manager_process_link(rtnl, mm, m); | |
149 | if (r < 0) | |
150 | return r; | |
151 | ||
152 | if (manager_all_configured(m)) | |
153 | sd_event_exit(m->event, 0); | |
154 | ||
155 | return 1; | |
156 | } | |
157 | ||
158 | static int manager_rtnl_listen(Manager *m) { | |
4afd3348 | 159 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; |
1c4baffc | 160 | sd_netlink_message *i; |
7de12ae7 TG |
161 | int r; |
162 | ||
163 | assert(m); | |
164 | ||
6fb2f9ab | 165 | /* First, subscribe to interfaces coming and going */ |
1c4baffc | 166 | r = sd_netlink_open(&m->rtnl); |
7de12ae7 TG |
167 | if (r < 0) |
168 | return r; | |
169 | ||
1c4baffc | 170 | r = sd_netlink_attach_event(m->rtnl, m->event, 0); |
7de12ae7 TG |
171 | if (r < 0) |
172 | return r; | |
173 | ||
1c4baffc | 174 | r = sd_netlink_add_match(m->rtnl, RTM_NEWLINK, on_rtnl_event, m); |
7de12ae7 TG |
175 | if (r < 0) |
176 | return r; | |
177 | ||
1c4baffc | 178 | r = sd_netlink_add_match(m->rtnl, RTM_DELLINK, on_rtnl_event, m); |
7de12ae7 TG |
179 | if (r < 0) |
180 | return r; | |
181 | ||
182 | /* Then, enumerate all links */ | |
183 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
184 | if (r < 0) | |
185 | return r; | |
186 | ||
1c4baffc | 187 | r = sd_netlink_message_request_dump(req, true); |
7de12ae7 TG |
188 | if (r < 0) |
189 | return r; | |
190 | ||
1c4baffc | 191 | r = sd_netlink_call(m->rtnl, req, 0, &reply); |
7de12ae7 TG |
192 | if (r < 0) |
193 | return r; | |
194 | ||
1c4baffc | 195 | for (i = reply; i; i = sd_netlink_message_next(i)) { |
7de12ae7 TG |
196 | r = manager_process_link(m->rtnl, i, m); |
197 | if (r < 0) | |
198 | return r; | |
199 | } | |
200 | ||
201 | return r; | |
202 | } | |
203 | ||
204 | static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
205 | Manager *m = userdata; | |
206 | Iterator i; | |
207 | Link *l; | |
208 | int r; | |
209 | ||
210 | assert(m); | |
211 | ||
212 | sd_network_monitor_flush(m->network_monitor); | |
213 | ||
214 | HASHMAP_FOREACH(l, m->links, i) { | |
215 | r = link_update_monitor(l); | |
216 | if (r < 0) | |
da927ba9 | 217 | log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex); |
7de12ae7 TG |
218 | } |
219 | ||
220 | if (manager_all_configured(m)) | |
221 | sd_event_exit(m->event, 0); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int manager_network_monitor_listen(Manager *m) { | |
227 | int r, fd, events; | |
228 | ||
229 | assert(m); | |
230 | ||
231 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
236 | if (fd < 0) | |
237 | return fd; | |
238 | ||
239 | events = sd_network_monitor_get_events(m->network_monitor); | |
240 | if (events < 0) | |
241 | return events; | |
242 | ||
243 | r = sd_event_add_io(m->event, &m->network_monitor_event_source, | |
244 | fd, events, &on_network_event, m); | |
245 | if (r < 0) | |
246 | return r; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
e56cdb7a | 251 | int manager_new(Manager **ret, char **interfaces, char **ignore, usec_t timeout) { |
7de12ae7 TG |
252 | _cleanup_(manager_freep) Manager *m = NULL; |
253 | int r; | |
254 | ||
255 | assert(ret); | |
256 | ||
257 | m = new0(Manager, 1); | |
258 | if (!m) | |
259 | return -ENOMEM; | |
260 | ||
261 | m->interfaces = interfaces; | |
79b1f37d | 262 | m->ignore = ignore; |
7de12ae7 TG |
263 | |
264 | r = sd_event_default(&m->event); | |
265 | if (r < 0) | |
266 | return r; | |
267 | ||
268 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
269 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
270 | ||
e56cdb7a TG |
271 | if (timeout > 0) { |
272 | usec_t usec; | |
273 | ||
274 | usec = now(clock_boottime_or_monotonic()) + timeout; | |
275 | ||
276 | r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT)); | |
277 | if (r < 0) | |
278 | return r; | |
279 | } | |
280 | ||
7de12ae7 TG |
281 | sd_event_set_watchdog(m->event, true); |
282 | ||
283 | r = manager_network_monitor_listen(m); | |
284 | if (r < 0) | |
285 | return r; | |
286 | ||
287 | r = manager_rtnl_listen(m); | |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
1cc6c93a | 291 | *ret = TAKE_PTR(m); |
7de12ae7 TG |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
296 | void manager_free(Manager *m) { | |
297 | Link *l; | |
298 | ||
299 | if (!m) | |
300 | return; | |
301 | ||
302 | while ((l = hashmap_first(m->links))) | |
303 | link_free(l); | |
304 | hashmap_free(m->links); | |
305 | hashmap_free(m->links_by_name); | |
306 | ||
307 | sd_event_source_unref(m->network_monitor_event_source); | |
308 | sd_network_monitor_unref(m->network_monitor); | |
309 | ||
310 | sd_event_source_unref(m->rtnl_event_source); | |
1c4baffc | 311 | sd_netlink_unref(m->rtnl); |
7de12ae7 TG |
312 | |
313 | sd_event_unref(m->event); | |
314 | free(m); | |
315 | ||
316 | return; | |
317 | } |