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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
65f568bb | 2 | |
65f568bb | 3 | #include <poll.h> |
65f568bb | 4 | |
1c4baffc | 5 | #include "sd-netlink.h" |
07630cea | 6 | |
b5efdb8a | 7 | #include "alloc-util.h" |
3ffd4af2 | 8 | #include "fd-util.h" |
07630cea | 9 | #include "hashmap.h" |
0f2d351f | 10 | #include "io-util.h" |
07630cea | 11 | #include "macro.h" |
56fdc16d | 12 | #include "netlink-genl.h" |
1c4baffc | 13 | #include "netlink-internal.h" |
ee38400b | 14 | #include "netlink-slot.h" |
84e10015 | 15 | #include "netlink-util.h" |
dccca82b | 16 | #include "process-util.h" |
2583fbea | 17 | #include "socket-util.h" |
8190a388 | 18 | #include "string-util.h" |
65f568bb | 19 | |
b522c4b9 LP |
20 | /* Some really high limit, to catch programming errors */ |
21 | #define REPLY_CALLBACKS_MAX UINT16_MAX | |
22 | ||
409856d3 YW |
23 | static int netlink_new(sd_netlink **ret) { |
24 | _cleanup_(sd_netlink_unrefp) sd_netlink *nl = NULL; | |
65f568bb TG |
25 | |
26 | assert_return(ret, -EINVAL); | |
27 | ||
409856d3 YW |
28 | nl = new(sd_netlink, 1); |
29 | if (!nl) | |
65f568bb TG |
30 | return -ENOMEM; |
31 | ||
409856d3 | 32 | *nl = (sd_netlink) { |
f23ab4dc | 33 | .n_ref = 1, |
254d1313 | 34 | .fd = -EBADF, |
2fea6090 YW |
35 | .sockaddr.nl.nl_family = AF_NETLINK, |
36 | .original_pid = getpid_cached(), | |
37 | .protocol = -1, | |
adf412b9 | 38 | |
ac3bc1b8 LP |
39 | /* Kernel change notification messages have sequence number 0. We want to avoid that with our |
40 | * own serials, in order not to get confused when matching up kernel replies to our earlier | |
41 | * requests. | |
42 | * | |
43 | * Moreover, when using netlink socket activation (i.e. where PID 1 binds an AF_NETLINK | |
44 | * socket for us and passes it to us across execve()) and we get restarted multiple times | |
45 | * while the socket sticks around we might get confused by replies from earlier runs coming | |
46 | * in late — which is pretty likely if we'd start our sequence numbers always from 1. Hence, | |
47 | * let's start with a value based on the system clock. This should make collisions much less | |
e503019b | 48 | * likely (though still theoretically possible). We use a 32 bit μs counter starting at boot |
ac3bc1b8 LP |
49 | * for this (and explicitly exclude the zero, see above). This counter will wrap around after |
50 | * a bit more than 1h, but that's hopefully OK as the kernel shouldn't take that long to | |
51 | * reply to our requests. | |
52 | * | |
53 | * We only pick the initial start value this way. For each message we simply increase the | |
e503019b | 54 | * sequence number by 1. This means we could enqueue 1 netlink message per μs without risking |
ac3bc1b8 LP |
55 | * collisions, which should be OK. |
56 | * | |
57 | * Note this means the serials will be in the range 1…UINT32_MAX here. | |
58 | * | |
59 | * (In an ideal world we'd attach the current serial counter to the netlink socket itself | |
60 | * somehow, to avoid all this, but I couldn't come up with a nice way to do this) */ | |
61 | .serial = (uint32_t) (now(CLOCK_MONOTONIC) % UINT32_MAX) + 1, | |
2fea6090 | 62 | }; |
8cec01b9 | 63 | |
409856d3 | 64 | *ret = TAKE_PTR(nl); |
65f568bb TG |
65 | return 0; |
66 | } | |
67 | ||
dd35a61c | 68 | int sd_netlink_open_fd(sd_netlink **ret, int fd) { |
409856d3 | 69 | _cleanup_(sd_netlink_unrefp) sd_netlink *nl = NULL; |
13ec9f10 | 70 | int r, protocol; |
65f568bb | 71 | |
9d0db178 | 72 | assert_return(ret, -EINVAL); |
8ac43fee | 73 | assert_return(fd >= 0, -EBADF); |
9d0db178 | 74 | |
409856d3 | 75 | r = netlink_new(&nl); |
65f568bb TG |
76 | if (r < 0) |
77 | return r; | |
78 | ||
13ec9f10 | 79 | r = getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, &protocol); |
05d0c2e3 JT |
80 | if (r < 0) |
81 | return r; | |
82 | ||
409856d3 YW |
83 | nl->fd = fd; |
84 | nl->protocol = protocol; | |
65f568bb | 85 | |
d7418b3b | 86 | r = setsockopt_int(fd, SOL_NETLINK, NETLINK_EXT_ACK, true); |
e4a1e68d YW |
87 | if (r < 0) |
88 | log_debug_errno(r, "sd-netlink: Failed to enable NETLINK_EXT_ACK option, ignoring: %m"); | |
89 | ||
d7418b3b YW |
90 | r = setsockopt_int(fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK, true); |
91 | if (r < 0) | |
92 | log_debug_errno(r, "sd-netlink: Failed to enable NETLINK_GET_STRICT_CHK option, ignoring: %m"); | |
93 | ||
409856d3 | 94 | r = socket_bind(nl); |
5c60db87 | 95 | if (r < 0) { |
254d1313 | 96 | nl->fd = -EBADF; /* on failure, the caller remains owner of the fd, hence don't close it here */ |
409856d3 | 97 | nl->protocol = -1; |
b95cc756 | 98 | return r; |
5c60db87 | 99 | } |
6d0b55c2 | 100 | |
409856d3 | 101 | *ret = TAKE_PTR(nl); |
65f568bb TG |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
dd35a61c | 106 | int sd_netlink_open(sd_netlink **ret) { |
05d0c2e3 JT |
107 | return netlink_open_family(ret, NETLINK_ROUTE); |
108 | } | |
109 | ||
dd35a61c | 110 | int sd_netlink_increase_rxbuf(sd_netlink *nl, size_t size) { |
409856d3 YW |
111 | assert_return(nl, -EINVAL); |
112 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
75f8a779 | 113 | |
28e7e934 | 114 | return fd_increase_rxbuf(nl->fd, size); |
be660c37 AR |
115 | } |
116 | ||
409856d3 | 117 | static sd_netlink *netlink_free(sd_netlink *nl) { |
ee38400b | 118 | sd_netlink_slot *s; |
8c578303 | 119 | |
409856d3 | 120 | assert(nl); |
4555ec72 | 121 | |
e417c4ac | 122 | ordered_set_free(nl->rqueue); |
7b34bae3 | 123 | hashmap_free(nl->rqueue_by_serial); |
e417c4ac | 124 | hashmap_free(nl->rqueue_partial_by_serial); |
409856d3 | 125 | free(nl->rbuffer); |
a88f77c4 | 126 | |
409856d3 | 127 | while ((s = nl->slots)) { |
ee38400b YW |
128 | assert(s->floating); |
129 | netlink_slot_disconnect(s, true); | |
545bab1f | 130 | } |
409856d3 YW |
131 | hashmap_free(nl->reply_callbacks); |
132 | prioq_free(nl->reply_callbacks_prioq); | |
22fdeadc | 133 | |
409856d3 YW |
134 | sd_event_source_unref(nl->io_event_source); |
135 | sd_event_source_unref(nl->time_event_source); | |
136 | sd_event_unref(nl->event); | |
22fdeadc | 137 | |
409856d3 | 138 | hashmap_free(nl->broadcast_group_refs); |
9c5a882b | 139 | |
56fdc16d | 140 | genl_clear_family(nl); |
4e8f0ef9 | 141 | |
409856d3 YW |
142 | safe_close(nl->fd); |
143 | return mfree(nl); | |
65f568bb TG |
144 | } |
145 | ||
f23ab4dc | 146 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_netlink, sd_netlink, netlink_free); |
1c71f7f3 | 147 | |
dd35a61c | 148 | int sd_netlink_send( |
409856d3 YW |
149 | sd_netlink *nl, |
150 | sd_netlink_message *message, | |
151 | uint32_t *serial) { | |
152 | ||
4555ec72 | 153 | int r; |
65f568bb TG |
154 | |
155 | assert_return(nl, -EINVAL); | |
409856d3 | 156 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
65f568bb | 157 | assert_return(message, -EINVAL); |
3dd215e0 | 158 | assert_return(!message->sealed, -EPERM); |
65f568bb | 159 | |
409856d3 | 160 | netlink_seal_message(nl, message); |
65f568bb | 161 | |
bbe181b4 TG |
162 | r = socket_write_message(nl, message); |
163 | if (r < 0) | |
164 | return r; | |
65f568bb | 165 | |
4555ec72 | 166 | if (serial) |
409856d3 | 167 | *serial = message_get_serial(message); |
65f568bb | 168 | |
4555ec72 TG |
169 | return 1; |
170 | } | |
65f568bb | 171 | |
e417c4ac YW |
172 | static int dispatch_rqueue(sd_netlink *nl, sd_netlink_message **ret) { |
173 | sd_netlink_message *m; | |
4555ec72 | 174 | int r; |
65f568bb | 175 | |
409856d3 | 176 | assert(nl); |
e417c4ac | 177 | assert(ret); |
4555ec72 | 178 | |
e417c4ac | 179 | if (ordered_set_size(nl->rqueue) <= 0) { |
1b89cf56 | 180 | /* Try to read a new message */ |
409856d3 | 181 | r = socket_read_message(nl); |
e417c4ac | 182 | if (r == -ENOBUFS) /* FIXME: ignore buffer overruns for now */ |
409856d3 | 183 | log_debug_errno(r, "sd-netlink: Got ENOBUFS from netlink socket, ignoring."); |
e417c4ac | 184 | else if (r < 0) |
1b89cf56 | 185 | return r; |
4555ec72 TG |
186 | } |
187 | ||
1b89cf56 | 188 | /* Dispatch a queued message */ |
e417c4ac | 189 | m = ordered_set_steal_first(nl->rqueue); |
6b15f2ef YW |
190 | if (m) |
191 | sd_netlink_message_unref(hashmap_remove_value(nl->rqueue_by_serial, UINT32_TO_PTR(message_get_serial(m)), m)); | |
e417c4ac YW |
192 | *ret = m; |
193 | return !!m; | |
4555ec72 TG |
194 | } |
195 | ||
409856d3 | 196 | static int process_timeout(sd_netlink *nl) { |
4afd3348 | 197 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
e16bcf98 | 198 | struct reply_callback *c; |
ee38400b | 199 | sd_netlink_slot *slot; |
e16bcf98 TG |
200 | usec_t n; |
201 | int r; | |
202 | ||
409856d3 | 203 | assert(nl); |
e16bcf98 | 204 | |
409856d3 | 205 | c = prioq_peek(nl->reply_callbacks_prioq); |
e16bcf98 TG |
206 | if (!c) |
207 | return 0; | |
208 | ||
209 | n = now(CLOCK_MONOTONIC); | |
210 | if (c->timeout > n) | |
211 | return 0; | |
212 | ||
409856d3 | 213 | r = message_new_synthetic_error(nl, -ETIMEDOUT, c->serial, &m); |
e16bcf98 TG |
214 | if (r < 0) |
215 | return r; | |
216 | ||
409856d3 | 217 | assert_se(prioq_pop(nl->reply_callbacks_prioq) == c); |
ee38400b | 218 | c->timeout = 0; |
409856d3 | 219 | hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(c->serial)); |
e16bcf98 | 220 | |
ee38400b YW |
221 | slot = container_of(c, sd_netlink_slot, reply_callback); |
222 | ||
409856d3 | 223 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 224 | if (r < 0) |
8190a388 YW |
225 | log_debug_errno(r, "sd-netlink: timedout callback %s%s%sfailed: %m", |
226 | slot->description ? "'" : "", | |
227 | strempty(slot->description), | |
228 | slot->description ? "' " : ""); | |
233ba5c3 | 229 | |
ee38400b YW |
230 | if (slot->floating) |
231 | netlink_slot_disconnect(slot, true); | |
e16bcf98 | 232 | |
233ba5c3 | 233 | return 1; |
e16bcf98 TG |
234 | } |
235 | ||
409856d3 | 236 | static int process_reply(sd_netlink *nl, sd_netlink_message *m) { |
ee38400b YW |
237 | struct reply_callback *c; |
238 | sd_netlink_slot *slot; | |
b522c4b9 | 239 | uint32_t serial; |
ea342a99 | 240 | uint16_t type; |
e16bcf98 TG |
241 | int r; |
242 | ||
409856d3 | 243 | assert(nl); |
e16bcf98 TG |
244 | assert(m); |
245 | ||
409856d3 YW |
246 | serial = message_get_serial(m); |
247 | c = hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(serial)); | |
e16bcf98 TG |
248 | if (!c) |
249 | return 0; | |
250 | ||
ee38400b | 251 | if (c->timeout != 0) { |
409856d3 | 252 | prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx); |
ee38400b YW |
253 | c->timeout = 0; |
254 | } | |
e16bcf98 | 255 | |
1c4baffc | 256 | r = sd_netlink_message_get_type(m, &type); |
ea342a99 | 257 | if (r < 0) |
ee38400b | 258 | return r; |
ea342a99 AR |
259 | |
260 | if (type == NLMSG_DONE) | |
261 | m = NULL; | |
262 | ||
ee38400b YW |
263 | slot = container_of(c, sd_netlink_slot, reply_callback); |
264 | ||
409856d3 | 265 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 266 | if (r < 0) |
8190a388 YW |
267 | log_debug_errno(r, "sd-netlink: reply callback %s%s%sfailed: %m", |
268 | slot->description ? "'" : "", | |
269 | strempty(slot->description), | |
270 | slot->description ? "' " : ""); | |
233ba5c3 | 271 | |
ee38400b YW |
272 | if (slot->floating) |
273 | netlink_slot_disconnect(slot, true); | |
545bab1f | 274 | |
233ba5c3 | 275 | return 1; |
e16bcf98 TG |
276 | } |
277 | ||
409856d3 | 278 | static int process_match(sd_netlink *nl, sd_netlink_message *m) { |
8cec01b9 | 279 | uint16_t type; |
e1578f60 | 280 | uint8_t cmd; |
8cec01b9 TG |
281 | int r; |
282 | ||
409856d3 | 283 | assert(nl); |
8cec01b9 TG |
284 | assert(m); |
285 | ||
1c4baffc | 286 | r = sd_netlink_message_get_type(m, &type); |
8cec01b9 TG |
287 | if (r < 0) |
288 | return r; | |
289 | ||
e1578f60 YW |
290 | if (m->protocol == NETLINK_GENERIC) { |
291 | r = sd_genl_message_get_command(nl, m, &cmd); | |
292 | if (r < 0) | |
293 | return r; | |
294 | } else | |
295 | cmd = 0; | |
296 | ||
409856d3 | 297 | LIST_FOREACH(match_callbacks, c, nl->match_callbacks) { |
e1578f60 | 298 | sd_netlink_slot *slot; |
4d4d898a | 299 | bool found = false; |
e1578f60 YW |
300 | |
301 | if (c->type != type) | |
302 | continue; | |
303 | if (c->cmd != 0 && c->cmd != cmd) | |
baf78f1a LP |
304 | continue; |
305 | ||
4d4d898a YW |
306 | for (size_t i = 0; i < c->n_groups; i++) |
307 | if (c->groups[i] == m->multicast_group) { | |
308 | found = true; | |
309 | break; | |
310 | } | |
311 | ||
312 | if (!found) | |
313 | continue; | |
314 | ||
baf78f1a LP |
315 | slot = container_of(c, sd_netlink_slot, match_callback); |
316 | ||
409856d3 | 317 | r = c->callback(nl, m, slot->userdata); |
baf78f1a LP |
318 | if (r < 0) |
319 | log_debug_errno(r, "sd-netlink: match callback %s%s%sfailed: %m", | |
320 | slot->description ? "'" : "", | |
321 | strempty(slot->description), | |
322 | slot->description ? "' " : ""); | |
323 | if (r != 0) | |
324 | break; | |
8cec01b9 TG |
325 | } |
326 | ||
233ba5c3 | 327 | return 1; |
8cec01b9 TG |
328 | } |
329 | ||
409856d3 | 330 | static int process_running(sd_netlink *nl, sd_netlink_message **ret) { |
4afd3348 | 331 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 TG |
332 | int r; |
333 | ||
409856d3 | 334 | assert(nl); |
9d0db178 | 335 | |
409856d3 | 336 | r = process_timeout(nl); |
e16bcf98 TG |
337 | if (r != 0) |
338 | goto null_message; | |
339 | ||
409856d3 | 340 | r = dispatch_rqueue(nl, &m); |
4555ec72 TG |
341 | if (r < 0) |
342 | return r; | |
343 | if (!m) | |
344 | goto null_message; | |
345 | ||
52888279 | 346 | if (sd_netlink_message_is_broadcast(m)) |
409856d3 | 347 | r = process_match(nl, m); |
52888279 | 348 | else |
409856d3 | 349 | r = process_reply(nl, m); |
52888279 YW |
350 | if (r != 0) |
351 | goto null_message; | |
8cec01b9 | 352 | |
4555ec72 | 353 | if (ret) { |
1cc6c93a | 354 | *ret = TAKE_PTR(m); |
4555ec72 TG |
355 | |
356 | return 1; | |
357 | } | |
358 | ||
359 | return 1; | |
360 | ||
361 | null_message: | |
362 | if (r >= 0 && ret) | |
363 | *ret = NULL; | |
364 | ||
365 | return r; | |
366 | } | |
e16bcf98 | 367 | |
409856d3 YW |
368 | int sd_netlink_process(sd_netlink *nl, sd_netlink_message **ret) { |
369 | NETLINK_DONT_DESTROY(nl); | |
4555ec72 TG |
370 | int r; |
371 | ||
409856d3 YW |
372 | assert_return(nl, -EINVAL); |
373 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
374 | assert_return(!nl->processing, -EBUSY); | |
4555ec72 | 375 | |
409856d3 YW |
376 | nl->processing = true; |
377 | r = process_running(nl, ret); | |
378 | nl->processing = false; | |
4555ec72 TG |
379 | |
380 | return r; | |
381 | } | |
382 | ||
383 | static usec_t calc_elapse(uint64_t usec) { | |
f5fbe71d | 384 | if (usec == UINT64_MAX) |
4555ec72 TG |
385 | return 0; |
386 | ||
387 | if (usec == 0) | |
409856d3 | 388 | usec = NETLINK_DEFAULT_TIMEOUT_USEC; |
4555ec72 | 389 | |
496db330 | 390 | return usec_add(now(CLOCK_MONOTONIC), usec); |
4555ec72 TG |
391 | } |
392 | ||
409856d3 | 393 | static int netlink_poll(sd_netlink *nl, bool need_more, usec_t timeout_usec) { |
3a43da28 | 394 | usec_t m = USEC_INFINITY; |
b4f2a5b1 TG |
395 | int r, e; |
396 | ||
409856d3 | 397 | assert(nl); |
4555ec72 | 398 | |
409856d3 | 399 | e = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
400 | if (e < 0) |
401 | return e; | |
4555ec72 | 402 | |
b4f2a5b1 TG |
403 | if (need_more) |
404 | /* Caller wants more data, and doesn't care about | |
405 | * what's been read or any other timeouts. */ | |
f55dc7c9 | 406 | e |= POLLIN; |
b4f2a5b1 TG |
407 | else { |
408 | usec_t until; | |
11537375 | 409 | |
b4f2a5b1 TG |
410 | /* Caller wants to process if there is something to |
411 | * process, but doesn't care otherwise */ | |
412 | ||
409856d3 | 413 | r = sd_netlink_get_timeout(nl, &until); |
b4f2a5b1 TG |
414 | if (r < 0) |
415 | return r; | |
65f568bb | 416 | |
11537375 YW |
417 | m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC)); |
418 | } | |
b4f2a5b1 | 419 | |
409856d3 | 420 | r = fd_wait_for_event(nl->fd, e, MIN(m, timeout_usec)); |
8d16f29b | 421 | if (r <= 0) |
0f2d351f | 422 | return r; |
4555ec72 | 423 | |
dad28bff | 424 | return 1; |
4555ec72 TG |
425 | } |
426 | ||
1c4baffc | 427 | int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
69858785 LP |
428 | int r; |
429 | ||
4555ec72 | 430 | assert_return(nl, -EINVAL); |
409856d3 | 431 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
4555ec72 | 432 | |
e417c4ac | 433 | if (ordered_set_size(nl->rqueue) > 0) |
4555ec72 TG |
434 | return 0; |
435 | ||
69858785 LP |
436 | r = netlink_poll(nl, false, timeout_usec); |
437 | if (r < 0 && ERRNO_IS_TRANSIENT(r)) /* Convert EINTR to "something happened" and give user a chance to run some code before calling back into us */ | |
438 | return 1; | |
439 | return r; | |
4555ec72 TG |
440 | } |
441 | ||
e16bcf98 TG |
442 | static int timeout_compare(const void *a, const void *b) { |
443 | const struct reply_callback *x = a, *y = b; | |
444 | ||
445 | if (x->timeout != 0 && y->timeout == 0) | |
446 | return -1; | |
447 | ||
448 | if (x->timeout == 0 && y->timeout != 0) | |
449 | return 1; | |
450 | ||
9c57a73b | 451 | return CMP(x->timeout, y->timeout); |
e16bcf98 TG |
452 | } |
453 | ||
dd35a61c | 454 | int sd_netlink_call_async( |
545bab1f | 455 | sd_netlink *nl, |
ee38400b | 456 | sd_netlink_slot **ret_slot, |
545bab1f YW |
457 | sd_netlink_message *m, |
458 | sd_netlink_message_handler_t callback, | |
459 | sd_netlink_destroy_t destroy_callback, | |
460 | void *userdata, | |
8190a388 YW |
461 | uint64_t usec, |
462 | const char *description) { | |
2b012288 | 463 | |
ee38400b | 464 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
e16bcf98 TG |
465 | int r, k; |
466 | ||
467 | assert_return(nl, -EINVAL); | |
468 | assert_return(m, -EINVAL); | |
469 | assert_return(callback, -EINVAL); | |
409856d3 | 470 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
e16bcf98 | 471 | |
b522c4b9 LP |
472 | if (hashmap_size(nl->reply_callbacks) >= REPLY_CALLBACKS_MAX) |
473 | return -ERANGE; | |
474 | ||
475 | r = hashmap_ensure_allocated(&nl->reply_callbacks, &trivial_hash_ops); | |
e16bcf98 TG |
476 | if (r < 0) |
477 | return r; | |
478 | ||
f5fbe71d | 479 | if (usec != UINT64_MAX) { |
e16bcf98 TG |
480 | r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
481 | if (r < 0) | |
482 | return r; | |
483 | } | |
484 | ||
5cd67116 | 485 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_REPLY_CALLBACK, sizeof(struct reply_callback), userdata, description, &slot); |
8190a388 YW |
486 | if (r < 0) |
487 | return r; | |
e16bcf98 | 488 | |
ee38400b YW |
489 | slot->reply_callback.callback = callback; |
490 | slot->reply_callback.timeout = calc_elapse(usec); | |
e16bcf98 | 491 | |
b522c4b9 | 492 | k = sd_netlink_send(nl, m, &slot->reply_callback.serial); |
545bab1f | 493 | if (k < 0) |
e16bcf98 | 494 | return k; |
e16bcf98 | 495 | |
b522c4b9 | 496 | r = hashmap_put(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial), &slot->reply_callback); |
545bab1f | 497 | if (r < 0) |
e16bcf98 | 498 | return r; |
e16bcf98 | 499 | |
ee38400b YW |
500 | if (slot->reply_callback.timeout != 0) { |
501 | r = prioq_put(nl->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx); | |
f6bdbd9e | 502 | if (r < 0) { |
b522c4b9 | 503 | (void) hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial)); |
e16bcf98 TG |
504 | return r; |
505 | } | |
506 | } | |
507 | ||
40c864af | 508 | /* Set this at last. Otherwise, some failures in above would call destroy_callback but some would not. */ |
5cd67116 YW |
509 | slot->destroy_callback = destroy_callback; |
510 | ||
ee38400b YW |
511 | if (ret_slot) |
512 | *ret_slot = slot; | |
e16bcf98 | 513 | |
ee38400b | 514 | TAKE_PTR(slot); |
545bab1f | 515 | |
e16bcf98 TG |
516 | return k; |
517 | } | |
518 | ||
dd35a61c | 519 | int sd_netlink_read( |
409856d3 | 520 | sd_netlink *nl, |
2b012288 YW |
521 | uint32_t serial, |
522 | uint64_t usec, | |
523 | sd_netlink_message **ret) { | |
524 | ||
4555ec72 | 525 | usec_t timeout; |
4555ec72 TG |
526 | int r; |
527 | ||
409856d3 YW |
528 | assert_return(nl, -EINVAL); |
529 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4555ec72 TG |
530 | |
531 | timeout = calc_elapse(usec); | |
532 | ||
65f568bb | 533 | for (;;) { |
7b34bae3 | 534 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 | 535 | usec_t left; |
65f568bb | 536 | |
7b34bae3 YW |
537 | m = hashmap_remove(nl->rqueue_by_serial, UINT32_TO_PTR(serial)); |
538 | if (m) { | |
2b012288 | 539 | uint16_t type; |
65f568bb | 540 | |
2b012288 | 541 | /* found a match, remove from rqueue and return it */ |
7b34bae3 | 542 | sd_netlink_message_unref(ordered_set_remove(nl->rqueue, m)); |
ea342a99 | 543 | |
7b34bae3 | 544 | r = sd_netlink_message_get_errno(m); |
2b012288 YW |
545 | if (r < 0) |
546 | return r; | |
1b89cf56 | 547 | |
7b34bae3 | 548 | r = sd_netlink_message_get_type(m, &type); |
2b012288 YW |
549 | if (r < 0) |
550 | return r; | |
ea342a99 | 551 | |
2b012288 | 552 | if (type == NLMSG_DONE) { |
766417bd YW |
553 | if (ret) |
554 | *ret = NULL; | |
2b012288 | 555 | return 0; |
65f568bb | 556 | } |
2b012288 YW |
557 | |
558 | if (ret) | |
7b34bae3 | 559 | *ret = TAKE_PTR(m); |
2b012288 | 560 | return 1; |
65f568bb | 561 | } |
1b89cf56 | 562 | |
409856d3 | 563 | r = socket_read_message(nl); |
1b89cf56 TG |
564 | if (r < 0) |
565 | return r; | |
566 | if (r > 0) | |
6ff8806e | 567 | /* received message, so try to process straight away */ |
4555ec72 | 568 | continue; |
65f568bb | 569 | |
4555ec72 TG |
570 | if (timeout > 0) { |
571 | usec_t n; | |
572 | ||
573 | n = now(CLOCK_MONOTONIC); | |
574 | if (n >= timeout) | |
575 | return -ETIMEDOUT; | |
576 | ||
11537375 | 577 | left = usec_sub_unsigned(timeout, n); |
4555ec72 | 578 | } else |
11537375 | 579 | left = USEC_INFINITY; |
4555ec72 | 580 | |
409856d3 | 581 | r = netlink_poll(nl, true, left); |
4555ec72 TG |
582 | if (r < 0) |
583 | return r; | |
2b012288 | 584 | if (r == 0) |
b551ddd3 | 585 | return -ETIMEDOUT; |
b4f2a5b1 TG |
586 | } |
587 | } | |
588 | ||
dd35a61c | 589 | int sd_netlink_call( |
409856d3 | 590 | sd_netlink *nl, |
4df42cd9 FW |
591 | sd_netlink_message *message, |
592 | uint64_t usec, | |
593 | sd_netlink_message **ret) { | |
2b012288 | 594 | |
4df42cd9 FW |
595 | uint32_t serial; |
596 | int r; | |
597 | ||
409856d3 YW |
598 | assert_return(nl, -EINVAL); |
599 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4df42cd9 FW |
600 | assert_return(message, -EINVAL); |
601 | ||
409856d3 | 602 | r = sd_netlink_send(nl, message, &serial); |
4df42cd9 FW |
603 | if (r < 0) |
604 | return r; | |
605 | ||
409856d3 | 606 | return sd_netlink_read(nl, serial, usec, ret); |
4df42cd9 FW |
607 | } |
608 | ||
dd35a61c | 609 | int sd_netlink_get_events(sd_netlink *nl) { |
409856d3 YW |
610 | assert_return(nl, -EINVAL); |
611 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
b4f2a5b1 | 612 | |
e417c4ac | 613 | return ordered_set_size(nl->rqueue) == 0 ? POLLIN : 0; |
b4f2a5b1 TG |
614 | } |
615 | ||
dd35a61c | 616 | int sd_netlink_get_timeout(sd_netlink *nl, uint64_t *timeout_usec) { |
b4f2a5b1 TG |
617 | struct reply_callback *c; |
618 | ||
409856d3 | 619 | assert_return(nl, -EINVAL); |
b4f2a5b1 | 620 | assert_return(timeout_usec, -EINVAL); |
409856d3 | 621 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
b4f2a5b1 | 622 | |
e417c4ac | 623 | if (ordered_set_size(nl->rqueue) > 0) { |
b4f2a5b1 TG |
624 | *timeout_usec = 0; |
625 | return 1; | |
626 | } | |
627 | ||
409856d3 | 628 | c = prioq_peek(nl->reply_callbacks_prioq); |
b4f2a5b1 | 629 | if (!c) { |
f5fbe71d | 630 | *timeout_usec = UINT64_MAX; |
b4f2a5b1 TG |
631 | return 0; |
632 | } | |
633 | ||
634 | *timeout_usec = c->timeout; | |
b4f2a5b1 TG |
635 | return 1; |
636 | } | |
637 | ||
638 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
99534007 | 639 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
640 | int r; |
641 | ||
409856d3 | 642 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
643 | if (r < 0) |
644 | return r; | |
645 | ||
646 | return 1; | |
647 | } | |
648 | ||
649 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 650 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
651 | int r; |
652 | ||
409856d3 | 653 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
654 | if (r < 0) |
655 | return r; | |
656 | ||
657 | return 1; | |
658 | } | |
659 | ||
660 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
99534007 | 661 | sd_netlink *nl = ASSERT_PTR(userdata); |
40c864af | 662 | int r, enabled; |
b4f2a5b1 TG |
663 | usec_t until; |
664 | ||
665 | assert(s); | |
b4f2a5b1 | 666 | |
40c864af | 667 | r = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
668 | if (r < 0) |
669 | return r; | |
670 | ||
40c864af | 671 | r = sd_event_source_set_io_events(nl->io_event_source, r); |
b4f2a5b1 TG |
672 | if (r < 0) |
673 | return r; | |
b4f2a5b1 | 674 | |
40c864af ZJS |
675 | enabled = sd_netlink_get_timeout(nl, &until); |
676 | if (enabled < 0) | |
677 | return enabled; | |
678 | if (enabled > 0) { | |
679 | r = sd_event_source_set_time(nl->time_event_source, until); | |
680 | if (r < 0) | |
681 | return r; | |
b4f2a5b1 TG |
682 | } |
683 | ||
93c0a5ec ZJS |
684 | r = sd_event_source_set_enabled(nl->time_event_source, |
685 | enabled > 0 ? SD_EVENT_ONESHOT : SD_EVENT_OFF); | |
b4f2a5b1 TG |
686 | if (r < 0) |
687 | return r; | |
688 | ||
689 | return 1; | |
690 | } | |
691 | ||
dd35a61c | 692 | int sd_netlink_attach_event(sd_netlink *nl, sd_event *event, int64_t priority) { |
b4f2a5b1 TG |
693 | int r; |
694 | ||
409856d3 YW |
695 | assert_return(nl, -EINVAL); |
696 | assert_return(!nl->event, -EBUSY); | |
b4f2a5b1 | 697 | |
409856d3 YW |
698 | assert(!nl->io_event_source); |
699 | assert(!nl->time_event_source); | |
b4f2a5b1 TG |
700 | |
701 | if (event) | |
409856d3 | 702 | nl->event = sd_event_ref(event); |
b4f2a5b1 | 703 | else { |
409856d3 | 704 | r = sd_event_default(&nl->event); |
b4f2a5b1 TG |
705 | if (r < 0) |
706 | return r; | |
707 | } | |
708 | ||
409856d3 | 709 | r = sd_event_add_io(nl->event, &nl->io_event_source, nl->fd, 0, io_callback, nl); |
b4f2a5b1 TG |
710 | if (r < 0) |
711 | goto fail; | |
712 | ||
409856d3 | 713 | r = sd_event_source_set_priority(nl->io_event_source, priority); |
b4f2a5b1 TG |
714 | if (r < 0) |
715 | goto fail; | |
716 | ||
409856d3 | 717 | r = sd_event_source_set_description(nl->io_event_source, "netlink-receive-message"); |
9021bb9f TG |
718 | if (r < 0) |
719 | goto fail; | |
720 | ||
409856d3 | 721 | r = sd_event_source_set_prepare(nl->io_event_source, prepare_callback); |
b4f2a5b1 TG |
722 | if (r < 0) |
723 | goto fail; | |
724 | ||
409856d3 | 725 | r = sd_event_add_time(nl->event, &nl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, nl); |
b4f2a5b1 TG |
726 | if (r < 0) |
727 | goto fail; | |
728 | ||
409856d3 | 729 | r = sd_event_source_set_priority(nl->time_event_source, priority); |
b4f2a5b1 TG |
730 | if (r < 0) |
731 | goto fail; | |
732 | ||
409856d3 | 733 | r = sd_event_source_set_description(nl->time_event_source, "netlink-timer"); |
9021bb9f TG |
734 | if (r < 0) |
735 | goto fail; | |
736 | ||
b4f2a5b1 TG |
737 | return 0; |
738 | ||
739 | fail: | |
409856d3 | 740 | sd_netlink_detach_event(nl); |
b4f2a5b1 TG |
741 | return r; |
742 | } | |
743 | ||
dd35a61c | 744 | int sd_netlink_detach_event(sd_netlink *nl) { |
409856d3 YW |
745 | assert_return(nl, -EINVAL); |
746 | assert_return(nl->event, -ENXIO); | |
b4f2a5b1 | 747 | |
409856d3 | 748 | nl->io_event_source = sd_event_source_unref(nl->io_event_source); |
b4f2a5b1 | 749 | |
409856d3 | 750 | nl->time_event_source = sd_event_source_unref(nl->time_event_source); |
b4f2a5b1 | 751 | |
409856d3 | 752 | nl->event = sd_event_unref(nl->event); |
b4f2a5b1 TG |
753 | |
754 | return 0; | |
755 | } | |
8cec01b9 | 756 | |
3f60e448 YW |
757 | int netlink_add_match_internal( |
758 | sd_netlink *nl, | |
ee38400b | 759 | sd_netlink_slot **ret_slot, |
3f60e448 YW |
760 | const uint32_t *groups, |
761 | size_t n_groups, | |
ee38400b | 762 | uint16_t type, |
e1578f60 | 763 | uint8_t cmd, |
ee38400b YW |
764 | sd_netlink_message_handler_t callback, |
765 | sd_netlink_destroy_t destroy_callback, | |
8190a388 YW |
766 | void *userdata, |
767 | const char *description) { | |
409856d3 | 768 | |
ee38400b | 769 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
31710be5 | 770 | int r; |
8cec01b9 | 771 | |
3f60e448 YW |
772 | assert(groups); |
773 | assert(n_groups > 0); | |
774 | ||
775 | for (size_t i = 0; i < n_groups; i++) { | |
776 | r = socket_broadcast_group_ref(nl, groups[i]); | |
777 | if (r < 0) | |
778 | return r; | |
779 | } | |
8cec01b9 | 780 | |
3f60e448 YW |
781 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_MATCH_CALLBACK, sizeof(struct match_callback), |
782 | userdata, description, &slot); | |
8190a388 YW |
783 | if (r < 0) |
784 | return r; | |
8cec01b9 | 785 | |
3f60e448 YW |
786 | slot->match_callback.groups = newdup(uint32_t, groups, n_groups); |
787 | if (!slot->match_callback.groups) | |
788 | return -ENOMEM; | |
789 | ||
790 | slot->match_callback.n_groups = n_groups; | |
ee38400b YW |
791 | slot->match_callback.callback = callback; |
792 | slot->match_callback.type = type; | |
e1578f60 | 793 | slot->match_callback.cmd = cmd; |
8cec01b9 | 794 | |
3f60e448 YW |
795 | LIST_PREPEND(match_callbacks, nl->match_callbacks, &slot->match_callback); |
796 | ||
797 | /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ | |
798 | slot->destroy_callback = destroy_callback; | |
799 | ||
800 | if (ret_slot) | |
801 | *ret_slot = slot; | |
802 | ||
803 | TAKE_PTR(slot); | |
804 | return 0; | |
805 | } | |
806 | ||
dd35a61c | 807 | int sd_netlink_add_match( |
3f60e448 YW |
808 | sd_netlink *rtnl, |
809 | sd_netlink_slot **ret_slot, | |
810 | uint16_t type, | |
811 | sd_netlink_message_handler_t callback, | |
812 | sd_netlink_destroy_t destroy_callback, | |
813 | void *userdata, | |
814 | const char *description) { | |
815 | ||
816 | static const uint32_t | |
817 | address_groups[] = { RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR, }, | |
818 | link_groups[] = { RTNLGRP_LINK, }, | |
819 | neighbor_groups[] = { RTNLGRP_NEIGH, }, | |
820 | nexthop_groups[] = { RTNLGRP_NEXTHOP, }, | |
821 | route_groups[] = { RTNLGRP_IPV4_ROUTE, RTNLGRP_IPV6_ROUTE, }, | |
27e93a4b YW |
822 | rule_groups[] = { RTNLGRP_IPV4_RULE, RTNLGRP_IPV6_RULE, }, |
823 | tc_groups[] = { RTNLGRP_TC }; | |
3f60e448 YW |
824 | const uint32_t *groups; |
825 | size_t n_groups; | |
826 | ||
827 | assert_return(rtnl, -EINVAL); | |
828 | assert_return(callback, -EINVAL); | |
829 | assert_return(!netlink_pid_changed(rtnl), -ECHILD); | |
830 | ||
31710be5 TG |
831 | switch (type) { |
832 | case RTM_NEWLINK: | |
31710be5 | 833 | case RTM_DELLINK: |
3f60e448 YW |
834 | groups = link_groups; |
835 | n_groups = ELEMENTSOF(link_groups); | |
31710be5 TG |
836 | break; |
837 | case RTM_NEWADDR: | |
31710be5 | 838 | case RTM_DELADDR: |
3f60e448 YW |
839 | groups = address_groups; |
840 | n_groups = ELEMENTSOF(address_groups); | |
d1bdafd2 WKI |
841 | break; |
842 | case RTM_NEWNEIGH: | |
843 | case RTM_DELNEIGH: | |
3f60e448 YW |
844 | groups = neighbor_groups; |
845 | n_groups = ELEMENTSOF(neighbor_groups); | |
31710be5 | 846 | break; |
87e4c847 TG |
847 | case RTM_NEWROUTE: |
848 | case RTM_DELROUTE: | |
3f60e448 YW |
849 | groups = route_groups; |
850 | n_groups = ELEMENTSOF(route_groups); | |
87e4c847 | 851 | break; |
bce67bbe SS |
852 | case RTM_NEWRULE: |
853 | case RTM_DELRULE: | |
3f60e448 YW |
854 | groups = rule_groups; |
855 | n_groups = ELEMENTSOF(rule_groups); | |
bce67bbe | 856 | break; |
c16c7808 SS |
857 | case RTM_NEWNEXTHOP: |
858 | case RTM_DELNEXTHOP: | |
3f60e448 YW |
859 | groups = nexthop_groups; |
860 | n_groups = ELEMENTSOF(nexthop_groups); | |
861 | break; | |
27e93a4b YW |
862 | case RTM_NEWQDISC: |
863 | case RTM_DELQDISC: | |
864 | case RTM_NEWTCLASS: | |
865 | case RTM_DELTCLASS: | |
866 | groups = tc_groups; | |
867 | n_groups = ELEMENTSOF(tc_groups); | |
868 | break; | |
31710be5 TG |
869 | default: |
870 | return -EOPNOTSUPP; | |
871 | } | |
872 | ||
e1578f60 | 873 | return netlink_add_match_internal(rtnl, ret_slot, groups, n_groups, type, 0, callback, |
3f60e448 | 874 | destroy_callback, userdata, description); |
8cec01b9 | 875 | } |
dc317a9a | 876 | |
dd35a61c | 877 | int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter) { |
dc317a9a YW |
878 | assert_return(nl, -EINVAL); |
879 | assert_return(len == 0 || filter, -EINVAL); | |
880 | ||
881 | if (setsockopt(nl->fd, SOL_SOCKET, | |
882 | len == 0 ? SO_DETACH_FILTER : SO_ATTACH_FILTER, | |
883 | &(struct sock_fprog) { | |
884 | .len = len, | |
f4f81a6b | 885 | .filter = (struct sock_filter*) filter, |
dc317a9a YW |
886 | }, sizeof(struct sock_fprog)) < 0) |
887 | return -errno; | |
888 | ||
889 | return 0; | |
890 | } |