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Commit | Line | Data |
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65f568bb TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
65f568bb | 20 | #include <poll.h> |
07630cea | 21 | #include <sys/socket.h> |
65f568bb | 22 | |
1c4baffc | 23 | #include "sd-netlink.h" |
07630cea | 24 | |
b5efdb8a | 25 | #include "alloc-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
07630cea LP |
27 | #include "hashmap.h" |
28 | #include "macro.h" | |
29 | #include "missing.h" | |
1c4baffc TG |
30 | #include "netlink-internal.h" |
31 | #include "netlink-util.h" | |
2583fbea | 32 | #include "socket-util.h" |
07630cea | 33 | #include "util.h" |
65f568bb | 34 | |
1c4baffc | 35 | static int sd_netlink_new(sd_netlink **ret) { |
4afd3348 | 36 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
65f568bb TG |
37 | |
38 | assert_return(ret, -EINVAL); | |
39 | ||
1c4baffc | 40 | rtnl = new0(sd_netlink, 1); |
65f568bb TG |
41 | if (!rtnl) |
42 | return -ENOMEM; | |
43 | ||
44 | rtnl->n_ref = REFCNT_INIT; | |
65f568bb | 45 | rtnl->fd = -1; |
65f568bb | 46 | rtnl->sockaddr.nl.nl_family = AF_NETLINK; |
adf412b9 TG |
47 | rtnl->original_pid = getpid(); |
48 | ||
8cec01b9 TG |
49 | LIST_HEAD_INIT(rtnl->match_callbacks); |
50 | ||
a88f77c4 TG |
51 | /* We guarantee that the read buffer has at least space for |
52 | * a message header */ | |
53 | if (!greedy_realloc((void**)&rtnl->rbuffer, &rtnl->rbuffer_allocated, | |
54 | sizeof(struct nlmsghdr), sizeof(uint8_t))) | |
55 | return -ENOMEM; | |
56 | ||
d422e52a RM |
57 | /* Change notification responses have sequence 0, so we must |
58 | * start our request sequence numbers at 1, or we may confuse our | |
59 | * responses with notifications from the kernel */ | |
60 | rtnl->serial = 1; | |
61 | ||
65f568bb | 62 | *ret = rtnl; |
689703f6 TG |
63 | rtnl = NULL; |
64 | ||
65f568bb TG |
65 | return 0; |
66 | } | |
67 | ||
1c4baffc | 68 | int sd_netlink_new_from_netlink(sd_netlink **ret, int fd) { |
4afd3348 | 69 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
a9944163 TG |
70 | socklen_t addrlen; |
71 | int r; | |
72 | ||
73 | assert_return(ret, -EINVAL); | |
74 | ||
1c4baffc | 75 | r = sd_netlink_new(&rtnl); |
a9944163 TG |
76 | if (r < 0) |
77 | return r; | |
78 | ||
79 | addrlen = sizeof(rtnl->sockaddr); | |
80 | ||
81 | r = getsockname(fd, &rtnl->sockaddr.sa, &addrlen); | |
82 | if (r < 0) | |
83 | return -errno; | |
84 | ||
d6c16624 LP |
85 | if (rtnl->sockaddr.nl.nl_family != AF_NETLINK) |
86 | return -EINVAL; | |
87 | ||
a9944163 TG |
88 | rtnl->fd = fd; |
89 | ||
90 | *ret = rtnl; | |
91 | rtnl = NULL; | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
1c4baffc | 96 | static bool rtnl_pid_changed(sd_netlink *rtnl) { |
adf412b9 TG |
97 | assert(rtnl); |
98 | ||
99 | /* We don't support people creating an rtnl connection and | |
100 | * keeping it around over a fork(). Let's complain. */ | |
101 | ||
102 | return rtnl->original_pid != getpid(); | |
103 | } | |
104 | ||
1c4baffc | 105 | int sd_netlink_open_fd(sd_netlink **ret, int fd) { |
4afd3348 | 106 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
b95cc756 | 107 | int r; |
65f568bb | 108 | |
9d0db178 | 109 | assert_return(ret, -EINVAL); |
8ac43fee | 110 | assert_return(fd >= 0, -EBADF); |
9d0db178 | 111 | |
1c4baffc | 112 | r = sd_netlink_new(&rtnl); |
65f568bb TG |
113 | if (r < 0) |
114 | return r; | |
115 | ||
b95cc756 | 116 | rtnl->fd = fd; |
65f568bb | 117 | |
b95cc756 | 118 | r = socket_bind(rtnl); |
5c60db87 LP |
119 | if (r < 0) { |
120 | rtnl->fd = -1; /* on failure, the caller remains owner of the fd, hence don't close it here */ | |
b95cc756 | 121 | return r; |
5c60db87 | 122 | } |
6d0b55c2 | 123 | |
65f568bb | 124 | *ret = rtnl; |
fe5c4e49 | 125 | rtnl = NULL; |
65f568bb TG |
126 | |
127 | return 0; | |
128 | } | |
129 | ||
1c4baffc | 130 | int sd_netlink_open(sd_netlink **ret) { |
31710be5 | 131 | _cleanup_close_ int fd = -1; |
6d0b55c2 LP |
132 | int r; |
133 | ||
b95cc756 | 134 | fd = socket_open(NETLINK_ROUTE); |
6d0b55c2 | 135 | if (fd < 0) |
b95cc756 | 136 | return fd; |
6d0b55c2 | 137 | |
1c4baffc | 138 | r = sd_netlink_open_fd(ret, fd); |
31710be5 | 139 | if (r < 0) |
6d0b55c2 | 140 | return r; |
31710be5 TG |
141 | |
142 | fd = -1; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
75f8a779 LP |
147 | int sd_netlink_inc_rcvbuf(sd_netlink *rtnl, size_t size) { |
148 | assert_return(rtnl, -EINVAL); | |
149 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
150 | ||
be660c37 AR |
151 | return fd_inc_rcvbuf(rtnl->fd, size); |
152 | } | |
153 | ||
1c4baffc | 154 | sd_netlink *sd_netlink_ref(sd_netlink *rtnl) { |
8c578303 TG |
155 | assert_return(rtnl, NULL); |
156 | assert_return(!rtnl_pid_changed(rtnl), NULL); | |
157 | ||
65f568bb TG |
158 | if (rtnl) |
159 | assert_se(REFCNT_INC(rtnl->n_ref) >= 2); | |
160 | ||
161 | return rtnl; | |
162 | } | |
163 | ||
1c4baffc | 164 | sd_netlink *sd_netlink_unref(sd_netlink *rtnl) { |
22fdeadc DH |
165 | if (!rtnl) |
166 | return NULL; | |
167 | ||
8c578303 | 168 | assert_return(!rtnl_pid_changed(rtnl), NULL); |
22fdeadc | 169 | |
f0c4b1c3 | 170 | if (REFCNT_DEC(rtnl->n_ref) == 0) { |
8cec01b9 | 171 | struct match_callback *f; |
4555ec72 TG |
172 | unsigned i; |
173 | ||
8c578303 | 174 | for (i = 0; i < rtnl->rqueue_size; i++) |
1c4baffc | 175 | sd_netlink_message_unref(rtnl->rqueue[i]); |
8c578303 | 176 | free(rtnl->rqueue); |
8cec01b9 | 177 | |
4e996881 | 178 | for (i = 0; i < rtnl->rqueue_partial_size; i++) |
1c4baffc | 179 | sd_netlink_message_unref(rtnl->rqueue_partial[i]); |
4e996881 TG |
180 | free(rtnl->rqueue_partial); |
181 | ||
a88f77c4 TG |
182 | free(rtnl->rbuffer); |
183 | ||
8c578303 TG |
184 | hashmap_free_free(rtnl->reply_callbacks); |
185 | prioq_free(rtnl->reply_callbacks_prioq); | |
22fdeadc | 186 | |
8c578303 TG |
187 | sd_event_source_unref(rtnl->io_event_source); |
188 | sd_event_source_unref(rtnl->time_event_source); | |
8c578303 | 189 | sd_event_unref(rtnl->event); |
22fdeadc | 190 | |
8c578303 | 191 | while ((f = rtnl->match_callbacks)) { |
9c5a882b | 192 | sd_netlink_remove_match(rtnl, f->type, f->callback, f->userdata); |
22fdeadc | 193 | } |
65f568bb | 194 | |
9c5a882b TG |
195 | hashmap_free(rtnl->broadcast_group_refs); |
196 | ||
8c578303 TG |
197 | safe_close(rtnl->fd); |
198 | free(rtnl); | |
199 | } | |
22fdeadc | 200 | |
65f568bb TG |
201 | return NULL; |
202 | } | |
203 | ||
1c4baffc | 204 | static void rtnl_seal_message(sd_netlink *rtnl, sd_netlink_message *m) { |
3dd215e0 TG |
205 | assert(rtnl); |
206 | assert(!rtnl_pid_changed(rtnl)); | |
207 | assert(m); | |
208 | assert(m->hdr); | |
209 | ||
3f42446d TG |
210 | /* don't use seq == 0, as that is used for broadcasts, so we |
211 | would get confused by replies to such messages */ | |
913b0eef | 212 | m->hdr->nlmsg_seq = rtnl->serial++ ? : rtnl->serial++; |
3dd215e0 TG |
213 | |
214 | rtnl_message_seal(m); | |
215 | ||
216 | return; | |
217 | } | |
218 | ||
1c4baffc TG |
219 | int sd_netlink_send(sd_netlink *nl, |
220 | sd_netlink_message *message, | |
4555ec72 TG |
221 | uint32_t *serial) { |
222 | int r; | |
65f568bb TG |
223 | |
224 | assert_return(nl, -EINVAL); | |
adf412b9 | 225 | assert_return(!rtnl_pid_changed(nl), -ECHILD); |
65f568bb | 226 | assert_return(message, -EINVAL); |
3dd215e0 | 227 | assert_return(!message->sealed, -EPERM); |
65f568bb | 228 | |
3dd215e0 | 229 | rtnl_seal_message(nl, message); |
65f568bb | 230 | |
bbe181b4 TG |
231 | r = socket_write_message(nl, message); |
232 | if (r < 0) | |
233 | return r; | |
65f568bb | 234 | |
4555ec72 | 235 | if (serial) |
3815f36f | 236 | *serial = rtnl_message_get_serial(message); |
65f568bb | 237 | |
4555ec72 TG |
238 | return 1; |
239 | } | |
65f568bb | 240 | |
1c4baffc | 241 | int rtnl_rqueue_make_room(sd_netlink *rtnl) { |
1b89cf56 TG |
242 | assert(rtnl); |
243 | ||
6190b9f9 TG |
244 | if (rtnl->rqueue_size >= RTNL_RQUEUE_MAX) { |
245 | log_debug("rtnl: exhausted the read queue size (%d)", RTNL_RQUEUE_MAX); | |
1b89cf56 | 246 | return -ENOBUFS; |
6190b9f9 | 247 | } |
1b89cf56 TG |
248 | |
249 | if (!GREEDY_REALLOC(rtnl->rqueue, rtnl->rqueue_allocated, rtnl->rqueue_size + 1)) | |
250 | return -ENOMEM; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
1c4baffc | 255 | int rtnl_rqueue_partial_make_room(sd_netlink *rtnl) { |
4e996881 TG |
256 | assert(rtnl); |
257 | ||
6190b9f9 TG |
258 | if (rtnl->rqueue_partial_size >= RTNL_RQUEUE_MAX) { |
259 | log_debug("rtnl: exhausted the partial read queue size (%d)", RTNL_RQUEUE_MAX); | |
4e996881 | 260 | return -ENOBUFS; |
6190b9f9 | 261 | } |
4e996881 TG |
262 | |
263 | if (!GREEDY_REALLOC(rtnl->rqueue_partial, rtnl->rqueue_partial_allocated, | |
264 | rtnl->rqueue_partial_size + 1)) | |
265 | return -ENOMEM; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
1c4baffc | 270 | static int dispatch_rqueue(sd_netlink *rtnl, sd_netlink_message **message) { |
4555ec72 | 271 | int r; |
65f568bb | 272 | |
4555ec72 TG |
273 | assert(rtnl); |
274 | assert(message); | |
275 | ||
1b89cf56 TG |
276 | if (rtnl->rqueue_size <= 0) { |
277 | /* Try to read a new message */ | |
278 | r = socket_read_message(rtnl); | |
279 | if (r <= 0) | |
280 | return r; | |
4555ec72 TG |
281 | } |
282 | ||
1b89cf56 TG |
283 | /* Dispatch a queued message */ |
284 | *message = rtnl->rqueue[0]; | |
313cefa1 | 285 | rtnl->rqueue_size--; |
1c4baffc | 286 | memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_netlink_message*) * rtnl->rqueue_size); |
4555ec72 TG |
287 | |
288 | return 1; | |
289 | } | |
290 | ||
1c4baffc | 291 | static int process_timeout(sd_netlink *rtnl) { |
4afd3348 | 292 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
e16bcf98 TG |
293 | struct reply_callback *c; |
294 | usec_t n; | |
295 | int r; | |
296 | ||
297 | assert(rtnl); | |
298 | ||
299 | c = prioq_peek(rtnl->reply_callbacks_prioq); | |
300 | if (!c) | |
301 | return 0; | |
302 | ||
303 | n = now(CLOCK_MONOTONIC); | |
304 | if (c->timeout > n) | |
305 | return 0; | |
306 | ||
3815f36f | 307 | r = rtnl_message_new_synthetic_error(-ETIMEDOUT, c->serial, &m); |
e16bcf98 TG |
308 | if (r < 0) |
309 | return r; | |
310 | ||
311 | assert_se(prioq_pop(rtnl->reply_callbacks_prioq) == c); | |
312 | hashmap_remove(rtnl->reply_callbacks, &c->serial); | |
313 | ||
314 | r = c->callback(rtnl, m, c->userdata); | |
233ba5c3 | 315 | if (r < 0) |
1c4baffc | 316 | log_debug_errno(r, "sd-netlink: timedout callback failed: %m"); |
233ba5c3 | 317 | |
e16bcf98 TG |
318 | free(c); |
319 | ||
233ba5c3 | 320 | return 1; |
e16bcf98 TG |
321 | } |
322 | ||
1c4baffc | 323 | static int process_reply(sd_netlink *rtnl, sd_netlink_message *m) { |
ea342a99 | 324 | _cleanup_free_ struct reply_callback *c = NULL; |
e16bcf98 | 325 | uint64_t serial; |
ea342a99 | 326 | uint16_t type; |
e16bcf98 TG |
327 | int r; |
328 | ||
329 | assert(rtnl); | |
330 | assert(m); | |
331 | ||
3815f36f | 332 | serial = rtnl_message_get_serial(m); |
e16bcf98 TG |
333 | c = hashmap_remove(rtnl->reply_callbacks, &serial); |
334 | if (!c) | |
335 | return 0; | |
336 | ||
337 | if (c->timeout != 0) | |
338 | prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx); | |
339 | ||
1c4baffc | 340 | r = sd_netlink_message_get_type(m, &type); |
ea342a99 AR |
341 | if (r < 0) |
342 | return 0; | |
343 | ||
344 | if (type == NLMSG_DONE) | |
345 | m = NULL; | |
346 | ||
e16bcf98 | 347 | r = c->callback(rtnl, m, c->userdata); |
233ba5c3 | 348 | if (r < 0) |
1c4baffc | 349 | log_debug_errno(r, "sd-netlink: callback failed: %m"); |
233ba5c3 | 350 | |
233ba5c3 | 351 | return 1; |
e16bcf98 TG |
352 | } |
353 | ||
1c4baffc | 354 | static int process_match(sd_netlink *rtnl, sd_netlink_message *m) { |
8cec01b9 TG |
355 | struct match_callback *c; |
356 | uint16_t type; | |
357 | int r; | |
358 | ||
359 | assert(rtnl); | |
360 | assert(m); | |
361 | ||
1c4baffc | 362 | r = sd_netlink_message_get_type(m, &type); |
8cec01b9 TG |
363 | if (r < 0) |
364 | return r; | |
365 | ||
366 | LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) { | |
23a7f0f7 | 367 | if (type == c->type) { |
8cec01b9 | 368 | r = c->callback(rtnl, m, c->userdata); |
233ba5c3 TG |
369 | if (r != 0) { |
370 | if (r < 0) | |
1c4baffc | 371 | log_debug_errno(r, "sd-netlink: match callback failed: %m"); |
233ba5c3 TG |
372 | |
373 | break; | |
374 | } | |
8cec01b9 TG |
375 | } |
376 | } | |
377 | ||
233ba5c3 | 378 | return 1; |
8cec01b9 TG |
379 | } |
380 | ||
1c4baffc | 381 | static int process_running(sd_netlink *rtnl, sd_netlink_message **ret) { |
4afd3348 | 382 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 TG |
383 | int r; |
384 | ||
9d0db178 TG |
385 | assert(rtnl); |
386 | ||
e16bcf98 TG |
387 | r = process_timeout(rtnl); |
388 | if (r != 0) | |
389 | goto null_message; | |
390 | ||
4555ec72 TG |
391 | r = dispatch_rqueue(rtnl, &m); |
392 | if (r < 0) | |
393 | return r; | |
394 | if (!m) | |
395 | goto null_message; | |
396 | ||
1c4baffc | 397 | if (sd_netlink_message_is_broadcast(m)) { |
f436aa11 TG |
398 | r = process_match(rtnl, m); |
399 | if (r != 0) | |
400 | goto null_message; | |
401 | } else { | |
402 | r = process_reply(rtnl, m); | |
403 | if (r != 0) | |
404 | goto null_message; | |
405 | } | |
8cec01b9 | 406 | |
4555ec72 TG |
407 | if (ret) { |
408 | *ret = m; | |
409 | m = NULL; | |
410 | ||
411 | return 1; | |
412 | } | |
413 | ||
414 | return 1; | |
415 | ||
416 | null_message: | |
417 | if (r >= 0 && ret) | |
418 | *ret = NULL; | |
419 | ||
420 | return r; | |
421 | } | |
e16bcf98 | 422 | |
1c4baffc | 423 | int sd_netlink_process(sd_netlink *rtnl, sd_netlink_message **ret) { |
4afd3348 | 424 | NETLINK_DONT_DESTROY(rtnl); |
4555ec72 TG |
425 | int r; |
426 | ||
427 | assert_return(rtnl, -EINVAL); | |
428 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
429 | assert_return(!rtnl->processing, -EBUSY); | |
430 | ||
431 | rtnl->processing = true; | |
432 | r = process_running(rtnl, ret); | |
433 | rtnl->processing = false; | |
434 | ||
435 | return r; | |
436 | } | |
437 | ||
438 | static usec_t calc_elapse(uint64_t usec) { | |
439 | if (usec == (uint64_t) -1) | |
440 | return 0; | |
441 | ||
442 | if (usec == 0) | |
443 | usec = RTNL_DEFAULT_TIMEOUT; | |
444 | ||
445 | return now(CLOCK_MONOTONIC) + usec; | |
446 | } | |
447 | ||
1c4baffc | 448 | static int rtnl_poll(sd_netlink *rtnl, bool need_more, uint64_t timeout_usec) { |
4555ec72 TG |
449 | struct pollfd p[1] = {}; |
450 | struct timespec ts; | |
3a43da28 | 451 | usec_t m = USEC_INFINITY; |
b4f2a5b1 TG |
452 | int r, e; |
453 | ||
454 | assert(rtnl); | |
4555ec72 | 455 | |
1c4baffc | 456 | e = sd_netlink_get_events(rtnl); |
b4f2a5b1 TG |
457 | if (e < 0) |
458 | return e; | |
4555ec72 | 459 | |
b4f2a5b1 TG |
460 | if (need_more) |
461 | /* Caller wants more data, and doesn't care about | |
462 | * what's been read or any other timeouts. */ | |
f55dc7c9 | 463 | e |= POLLIN; |
b4f2a5b1 TG |
464 | else { |
465 | usec_t until; | |
466 | /* Caller wants to process if there is something to | |
467 | * process, but doesn't care otherwise */ | |
468 | ||
1c4baffc | 469 | r = sd_netlink_get_timeout(rtnl, &until); |
b4f2a5b1 TG |
470 | if (r < 0) |
471 | return r; | |
472 | if (r > 0) { | |
473 | usec_t nw; | |
474 | nw = now(CLOCK_MONOTONIC); | |
475 | m = until > nw ? until - nw : 0; | |
476 | } | |
477 | } | |
65f568bb | 478 | |
b4f2a5b1 TG |
479 | if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) |
480 | m = timeout_usec; | |
481 | ||
482 | p[0].fd = rtnl->fd; | |
483 | p[0].events = e; | |
484 | ||
485 | r = ppoll(p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); | |
4555ec72 TG |
486 | if (r < 0) |
487 | return -errno; | |
488 | ||
489 | return r > 0 ? 1 : 0; | |
490 | } | |
491 | ||
1c4baffc | 492 | int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
4555ec72 TG |
493 | assert_return(nl, -EINVAL); |
494 | assert_return(!rtnl_pid_changed(nl), -ECHILD); | |
495 | ||
496 | if (nl->rqueue_size > 0) | |
497 | return 0; | |
498 | ||
b4f2a5b1 | 499 | return rtnl_poll(nl, false, timeout_usec); |
4555ec72 TG |
500 | } |
501 | ||
e16bcf98 TG |
502 | static int timeout_compare(const void *a, const void *b) { |
503 | const struct reply_callback *x = a, *y = b; | |
504 | ||
505 | if (x->timeout != 0 && y->timeout == 0) | |
506 | return -1; | |
507 | ||
508 | if (x->timeout == 0 && y->timeout != 0) | |
509 | return 1; | |
510 | ||
511 | if (x->timeout < y->timeout) | |
512 | return -1; | |
513 | ||
514 | if (x->timeout > y->timeout) | |
515 | return 1; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
1c4baffc TG |
520 | int sd_netlink_call_async(sd_netlink *nl, |
521 | sd_netlink_message *m, | |
522 | sd_netlink_message_handler_t callback, | |
e16bcf98 TG |
523 | void *userdata, |
524 | uint64_t usec, | |
525 | uint32_t *serial) { | |
526 | struct reply_callback *c; | |
527 | uint32_t s; | |
528 | int r, k; | |
529 | ||
530 | assert_return(nl, -EINVAL); | |
531 | assert_return(m, -EINVAL); | |
532 | assert_return(callback, -EINVAL); | |
533 | assert_return(!rtnl_pid_changed(nl), -ECHILD); | |
534 | ||
d5099efc | 535 | r = hashmap_ensure_allocated(&nl->reply_callbacks, &uint64_hash_ops); |
e16bcf98 TG |
536 | if (r < 0) |
537 | return r; | |
538 | ||
539 | if (usec != (uint64_t) -1) { | |
540 | r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); | |
541 | if (r < 0) | |
542 | return r; | |
543 | } | |
544 | ||
545 | c = new0(struct reply_callback, 1); | |
546 | if (!c) | |
547 | return -ENOMEM; | |
548 | ||
549 | c->callback = callback; | |
550 | c->userdata = userdata; | |
551 | c->timeout = calc_elapse(usec); | |
552 | ||
1c4baffc | 553 | k = sd_netlink_send(nl, m, &s); |
e16bcf98 TG |
554 | if (k < 0) { |
555 | free(c); | |
556 | return k; | |
557 | } | |
558 | ||
559 | c->serial = s; | |
560 | ||
561 | r = hashmap_put(nl->reply_callbacks, &c->serial, c); | |
562 | if (r < 0) { | |
563 | free(c); | |
564 | return r; | |
565 | } | |
566 | ||
567 | if (c->timeout != 0) { | |
568 | r = prioq_put(nl->reply_callbacks_prioq, c, &c->prioq_idx); | |
569 | if (r > 0) { | |
570 | c->timeout = 0; | |
1c4baffc | 571 | sd_netlink_call_async_cancel(nl, c->serial); |
e16bcf98 TG |
572 | return r; |
573 | } | |
574 | } | |
575 | ||
576 | if (serial) | |
577 | *serial = s; | |
578 | ||
579 | return k; | |
580 | } | |
581 | ||
1c4baffc | 582 | int sd_netlink_call_async_cancel(sd_netlink *nl, uint32_t serial) { |
e16bcf98 TG |
583 | struct reply_callback *c; |
584 | uint64_t s = serial; | |
585 | ||
586 | assert_return(nl, -EINVAL); | |
587 | assert_return(serial != 0, -EINVAL); | |
588 | assert_return(!rtnl_pid_changed(nl), -ECHILD); | |
589 | ||
590 | c = hashmap_remove(nl->reply_callbacks, &s); | |
591 | if (!c) | |
592 | return 0; | |
593 | ||
594 | if (c->timeout != 0) | |
595 | prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx); | |
596 | ||
597 | free(c); | |
598 | return 1; | |
599 | } | |
600 | ||
1c4baffc TG |
601 | int sd_netlink_call(sd_netlink *rtnl, |
602 | sd_netlink_message *message, | |
4555ec72 | 603 | uint64_t usec, |
1c4baffc | 604 | sd_netlink_message **ret) { |
4555ec72 TG |
605 | usec_t timeout; |
606 | uint32_t serial; | |
4555ec72 TG |
607 | int r; |
608 | ||
1b89cf56 TG |
609 | assert_return(rtnl, -EINVAL); |
610 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
4555ec72 TG |
611 | assert_return(message, -EINVAL); |
612 | ||
1c4baffc | 613 | r = sd_netlink_send(rtnl, message, &serial); |
4555ec72 TG |
614 | if (r < 0) |
615 | return r; | |
616 | ||
617 | timeout = calc_elapse(usec); | |
618 | ||
65f568bb | 619 | for (;;) { |
4555ec72 | 620 | usec_t left; |
ea342a99 | 621 | unsigned i; |
65f568bb | 622 | |
ea342a99 | 623 | for (i = 0; i < rtnl->rqueue_size; i++) { |
1b89cf56 | 624 | uint32_t received_serial; |
65f568bb | 625 | |
ea342a99 | 626 | received_serial = rtnl_message_get_serial(rtnl->rqueue[i]); |
65f568bb TG |
627 | |
628 | if (received_serial == serial) { | |
4afd3348 | 629 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *incoming = NULL; |
ea342a99 AR |
630 | uint16_t type; |
631 | ||
632 | incoming = rtnl->rqueue[i]; | |
633 | ||
1b89cf56 TG |
634 | /* found a match, remove from rqueue and return it */ |
635 | memmove(rtnl->rqueue + i,rtnl->rqueue + i + 1, | |
1c4baffc | 636 | sizeof(sd_netlink_message*) * (rtnl->rqueue_size - i - 1)); |
1b89cf56 TG |
637 | rtnl->rqueue_size--; |
638 | ||
1c4baffc | 639 | r = sd_netlink_message_get_errno(incoming); |
ea342a99 AR |
640 | if (r < 0) |
641 | return r; | |
642 | ||
1c4baffc | 643 | r = sd_netlink_message_get_type(incoming, &type); |
ea342a99 | 644 | if (r < 0) |
65f568bb | 645 | return r; |
ea342a99 AR |
646 | |
647 | if (type == NLMSG_DONE) { | |
648 | *ret = NULL; | |
649 | return 0; | |
1b89cf56 | 650 | } |
65f568bb | 651 | |
fe5c4e49 | 652 | if (ret) { |
4555ec72 | 653 | *ret = incoming; |
ea342a99 AR |
654 | incoming = NULL; |
655 | } | |
65f568bb | 656 | |
4555ec72 | 657 | return 1; |
65f568bb | 658 | } |
65f568bb | 659 | } |
1b89cf56 TG |
660 | |
661 | r = socket_read_message(rtnl); | |
662 | if (r < 0) | |
663 | return r; | |
664 | if (r > 0) | |
6ff8806e | 665 | /* received message, so try to process straight away */ |
4555ec72 | 666 | continue; |
65f568bb | 667 | |
4555ec72 TG |
668 | if (timeout > 0) { |
669 | usec_t n; | |
670 | ||
671 | n = now(CLOCK_MONOTONIC); | |
672 | if (n >= timeout) | |
673 | return -ETIMEDOUT; | |
674 | ||
675 | left = timeout - n; | |
676 | } else | |
677 | left = (uint64_t) -1; | |
678 | ||
1b89cf56 | 679 | r = rtnl_poll(rtnl, true, left); |
4555ec72 TG |
680 | if (r < 0) |
681 | return r; | |
b551ddd3 TG |
682 | else if (r == 0) |
683 | return -ETIMEDOUT; | |
b4f2a5b1 TG |
684 | } |
685 | } | |
686 | ||
1c4baffc | 687 | int sd_netlink_get_events(sd_netlink *rtnl) { |
b4f2a5b1 TG |
688 | assert_return(rtnl, -EINVAL); |
689 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
690 | ||
bbe181b4 TG |
691 | if (rtnl->rqueue_size == 0) |
692 | return POLLIN; | |
693 | else | |
694 | return 0; | |
b4f2a5b1 TG |
695 | } |
696 | ||
1c4baffc | 697 | int sd_netlink_get_timeout(sd_netlink *rtnl, uint64_t *timeout_usec) { |
b4f2a5b1 TG |
698 | struct reply_callback *c; |
699 | ||
700 | assert_return(rtnl, -EINVAL); | |
701 | assert_return(timeout_usec, -EINVAL); | |
702 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
703 | ||
704 | if (rtnl->rqueue_size > 0) { | |
705 | *timeout_usec = 0; | |
706 | return 1; | |
707 | } | |
708 | ||
709 | c = prioq_peek(rtnl->reply_callbacks_prioq); | |
710 | if (!c) { | |
711 | *timeout_usec = (uint64_t) -1; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | *timeout_usec = c->timeout; | |
716 | ||
717 | return 1; | |
718 | } | |
719 | ||
720 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1c4baffc | 721 | sd_netlink *rtnl = userdata; |
b4f2a5b1 TG |
722 | int r; |
723 | ||
724 | assert(rtnl); | |
725 | ||
1c4baffc | 726 | r = sd_netlink_process(rtnl, NULL); |
b4f2a5b1 TG |
727 | if (r < 0) |
728 | return r; | |
729 | ||
730 | return 1; | |
731 | } | |
732 | ||
733 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
1c4baffc | 734 | sd_netlink *rtnl = userdata; |
b4f2a5b1 TG |
735 | int r; |
736 | ||
737 | assert(rtnl); | |
738 | ||
1c4baffc | 739 | r = sd_netlink_process(rtnl, NULL); |
b4f2a5b1 TG |
740 | if (r < 0) |
741 | return r; | |
742 | ||
743 | return 1; | |
744 | } | |
745 | ||
746 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
1c4baffc | 747 | sd_netlink *rtnl = userdata; |
b4f2a5b1 TG |
748 | int r, e; |
749 | usec_t until; | |
750 | ||
751 | assert(s); | |
752 | assert(rtnl); | |
753 | ||
1c4baffc | 754 | e = sd_netlink_get_events(rtnl); |
b4f2a5b1 TG |
755 | if (e < 0) |
756 | return e; | |
757 | ||
758 | r = sd_event_source_set_io_events(rtnl->io_event_source, e); | |
759 | if (r < 0) | |
760 | return r; | |
761 | ||
1c4baffc | 762 | r = sd_netlink_get_timeout(rtnl, &until); |
b4f2a5b1 TG |
763 | if (r < 0) |
764 | return r; | |
765 | if (r > 0) { | |
766 | int j; | |
767 | ||
768 | j = sd_event_source_set_time(rtnl->time_event_source, until); | |
769 | if (j < 0) | |
770 | return j; | |
771 | } | |
772 | ||
773 | r = sd_event_source_set_enabled(rtnl->time_event_source, r > 0); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
777 | return 1; | |
778 | } | |
779 | ||
32d20645 | 780 | int sd_netlink_attach_event(sd_netlink *rtnl, sd_event *event, int64_t priority) { |
b4f2a5b1 TG |
781 | int r; |
782 | ||
783 | assert_return(rtnl, -EINVAL); | |
784 | assert_return(!rtnl->event, -EBUSY); | |
785 | ||
786 | assert(!rtnl->io_event_source); | |
787 | assert(!rtnl->time_event_source); | |
788 | ||
789 | if (event) | |
790 | rtnl->event = sd_event_ref(event); | |
791 | else { | |
792 | r = sd_event_default(&rtnl->event); | |
793 | if (r < 0) | |
794 | return r; | |
795 | } | |
796 | ||
151b9b96 | 797 | r = sd_event_add_io(rtnl->event, &rtnl->io_event_source, rtnl->fd, 0, io_callback, rtnl); |
b4f2a5b1 TG |
798 | if (r < 0) |
799 | goto fail; | |
800 | ||
801 | r = sd_event_source_set_priority(rtnl->io_event_source, priority); | |
802 | if (r < 0) | |
803 | goto fail; | |
804 | ||
356779df | 805 | r = sd_event_source_set_description(rtnl->io_event_source, "rtnl-receive-message"); |
9021bb9f TG |
806 | if (r < 0) |
807 | goto fail; | |
808 | ||
b4f2a5b1 TG |
809 | r = sd_event_source_set_prepare(rtnl->io_event_source, prepare_callback); |
810 | if (r < 0) | |
811 | goto fail; | |
812 | ||
6a0f1f6d | 813 | r = sd_event_add_time(rtnl->event, &rtnl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, rtnl); |
b4f2a5b1 TG |
814 | if (r < 0) |
815 | goto fail; | |
816 | ||
817 | r = sd_event_source_set_priority(rtnl->time_event_source, priority); | |
818 | if (r < 0) | |
819 | goto fail; | |
820 | ||
356779df | 821 | r = sd_event_source_set_description(rtnl->time_event_source, "rtnl-timer"); |
9021bb9f TG |
822 | if (r < 0) |
823 | goto fail; | |
824 | ||
b4f2a5b1 TG |
825 | return 0; |
826 | ||
827 | fail: | |
1c4baffc | 828 | sd_netlink_detach_event(rtnl); |
b4f2a5b1 TG |
829 | return r; |
830 | } | |
831 | ||
1c4baffc | 832 | int sd_netlink_detach_event(sd_netlink *rtnl) { |
b4f2a5b1 TG |
833 | assert_return(rtnl, -EINVAL); |
834 | assert_return(rtnl->event, -ENXIO); | |
835 | ||
bbe181b4 | 836 | rtnl->io_event_source = sd_event_source_unref(rtnl->io_event_source); |
b4f2a5b1 | 837 | |
bbe181b4 | 838 | rtnl->time_event_source = sd_event_source_unref(rtnl->time_event_source); |
b4f2a5b1 | 839 | |
bbe181b4 | 840 | rtnl->event = sd_event_unref(rtnl->event); |
b4f2a5b1 TG |
841 | |
842 | return 0; | |
843 | } | |
8cec01b9 | 844 | |
1c4baffc | 845 | int sd_netlink_add_match(sd_netlink *rtnl, |
23a7f0f7 | 846 | uint16_t type, |
1c4baffc | 847 | sd_netlink_message_handler_t callback, |
8cec01b9 | 848 | void *userdata) { |
31710be5 TG |
849 | _cleanup_free_ struct match_callback *c = NULL; |
850 | int r; | |
8cec01b9 TG |
851 | |
852 | assert_return(rtnl, -EINVAL); | |
853 | assert_return(callback, -EINVAL); | |
8cec01b9 TG |
854 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); |
855 | ||
856 | c = new0(struct match_callback, 1); | |
857 | if (!c) | |
858 | return -ENOMEM; | |
859 | ||
860 | c->callback = callback; | |
23a7f0f7 | 861 | c->type = type; |
8cec01b9 TG |
862 | c->userdata = userdata; |
863 | ||
31710be5 TG |
864 | switch (type) { |
865 | case RTM_NEWLINK: | |
31710be5 | 866 | case RTM_DELLINK: |
9c5a882b | 867 | r = socket_broadcast_group_ref(rtnl, RTNLGRP_LINK); |
31710be5 TG |
868 | if (r < 0) |
869 | return r; | |
870 | ||
871 | break; | |
872 | case RTM_NEWADDR: | |
31710be5 | 873 | case RTM_DELADDR: |
9c5a882b | 874 | r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV4_IFADDR); |
31710be5 TG |
875 | if (r < 0) |
876 | return r; | |
877 | ||
9c5a882b | 878 | r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV6_IFADDR); |
31710be5 TG |
879 | if (r < 0) |
880 | return r; | |
881 | ||
882 | break; | |
87e4c847 TG |
883 | case RTM_NEWROUTE: |
884 | case RTM_DELROUTE: | |
9c5a882b | 885 | r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV4_ROUTE); |
87e4c847 TG |
886 | if (r < 0) |
887 | return r; | |
888 | ||
9c5a882b | 889 | r = socket_broadcast_group_ref(rtnl, RTNLGRP_IPV6_ROUTE); |
87e4c847 TG |
890 | if (r < 0) |
891 | return r; | |
892 | break; | |
31710be5 TG |
893 | default: |
894 | return -EOPNOTSUPP; | |
895 | } | |
896 | ||
8cec01b9 TG |
897 | LIST_PREPEND(match_callbacks, rtnl->match_callbacks, c); |
898 | ||
31710be5 TG |
899 | c = NULL; |
900 | ||
8cec01b9 TG |
901 | return 0; |
902 | } | |
903 | ||
1c4baffc | 904 | int sd_netlink_remove_match(sd_netlink *rtnl, |
23a7f0f7 | 905 | uint16_t type, |
1c4baffc | 906 | sd_netlink_message_handler_t callback, |
8cec01b9 TG |
907 | void *userdata) { |
908 | struct match_callback *c; | |
9c5a882b | 909 | int r; |
8cec01b9 TG |
910 | |
911 | assert_return(rtnl, -EINVAL); | |
912 | assert_return(callback, -EINVAL); | |
913 | assert_return(!rtnl_pid_changed(rtnl), -ECHILD); | |
914 | ||
915 | LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) | |
23a7f0f7 | 916 | if (c->callback == callback && c->type == type && c->userdata == userdata) { |
8cec01b9 TG |
917 | LIST_REMOVE(match_callbacks, rtnl->match_callbacks, c); |
918 | free(c); | |
919 | ||
9c5a882b TG |
920 | switch (type) { |
921 | case RTM_NEWLINK: | |
922 | case RTM_DELLINK: | |
923 | r = socket_broadcast_group_unref(rtnl, RTNLGRP_LINK); | |
924 | if (r < 0) | |
925 | return r; | |
926 | ||
927 | break; | |
928 | case RTM_NEWADDR: | |
929 | case RTM_DELADDR: | |
930 | r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV4_IFADDR); | |
931 | if (r < 0) | |
932 | return r; | |
933 | ||
934 | r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV6_IFADDR); | |
935 | if (r < 0) | |
936 | return r; | |
937 | ||
938 | break; | |
939 | case RTM_NEWROUTE: | |
940 | case RTM_DELROUTE: | |
941 | r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV4_ROUTE); | |
942 | if (r < 0) | |
943 | return r; | |
944 | ||
945 | r = socket_broadcast_group_unref(rtnl, RTNLGRP_IPV6_ROUTE); | |
946 | if (r < 0) | |
947 | return r; | |
948 | break; | |
949 | default: | |
950 | return -EOPNOTSUPP; | |
951 | } | |
952 | ||
8cec01b9 TG |
953 | return 1; |
954 | } | |
955 | ||
956 | return 0; | |
957 | } |