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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, |
2fea6090 YW |
34 | .fd = -1, |
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 | |
48 | * likely (though still theoretically possible). We use a 32 bit µs counter starting at boot | |
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 | |
54 | * sequence number by 1. This means we could enqueue 1 netlink message per µs without risking | |
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) { |
409856d3 YW |
96 | nl->fd = -1; /* on failure, the caller remains owner of the fd, hence don't close it here */ |
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; |
1c71f7f3 | 119 | unsigned i; |
8c578303 | 120 | |
409856d3 | 121 | assert(nl); |
4555ec72 | 122 | |
409856d3 YW |
123 | for (i = 0; i < nl->rqueue_size; i++) |
124 | sd_netlink_message_unref(nl->rqueue[i]); | |
125 | free(nl->rqueue); | |
8cec01b9 | 126 | |
409856d3 YW |
127 | for (i = 0; i < nl->rqueue_partial_size; i++) |
128 | sd_netlink_message_unref(nl->rqueue_partial[i]); | |
129 | free(nl->rqueue_partial); | |
4e996881 | 130 | |
409856d3 | 131 | free(nl->rbuffer); |
a88f77c4 | 132 | |
409856d3 | 133 | while ((s = nl->slots)) { |
ee38400b YW |
134 | assert(s->floating); |
135 | netlink_slot_disconnect(s, true); | |
545bab1f | 136 | } |
409856d3 YW |
137 | hashmap_free(nl->reply_callbacks); |
138 | prioq_free(nl->reply_callbacks_prioq); | |
22fdeadc | 139 | |
409856d3 YW |
140 | sd_event_source_unref(nl->io_event_source); |
141 | sd_event_source_unref(nl->time_event_source); | |
142 | sd_event_unref(nl->event); | |
22fdeadc | 143 | |
409856d3 | 144 | hashmap_free(nl->broadcast_group_refs); |
9c5a882b | 145 | |
56fdc16d | 146 | genl_clear_family(nl); |
4e8f0ef9 | 147 | |
409856d3 YW |
148 | safe_close(nl->fd); |
149 | return mfree(nl); | |
65f568bb TG |
150 | } |
151 | ||
f23ab4dc | 152 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_netlink, sd_netlink, netlink_free); |
1c71f7f3 | 153 | |
dd35a61c | 154 | int sd_netlink_send( |
409856d3 YW |
155 | sd_netlink *nl, |
156 | sd_netlink_message *message, | |
157 | uint32_t *serial) { | |
158 | ||
4555ec72 | 159 | int r; |
65f568bb TG |
160 | |
161 | assert_return(nl, -EINVAL); | |
409856d3 | 162 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
65f568bb | 163 | assert_return(message, -EINVAL); |
3dd215e0 | 164 | assert_return(!message->sealed, -EPERM); |
65f568bb | 165 | |
409856d3 | 166 | netlink_seal_message(nl, message); |
65f568bb | 167 | |
bbe181b4 TG |
168 | r = socket_write_message(nl, message); |
169 | if (r < 0) | |
170 | return r; | |
65f568bb | 171 | |
4555ec72 | 172 | if (serial) |
409856d3 | 173 | *serial = message_get_serial(message); |
65f568bb | 174 | |
4555ec72 TG |
175 | return 1; |
176 | } | |
65f568bb | 177 | |
409856d3 | 178 | static int dispatch_rqueue(sd_netlink *nl, sd_netlink_message **message) { |
4555ec72 | 179 | int r; |
65f568bb | 180 | |
409856d3 | 181 | assert(nl); |
4555ec72 TG |
182 | assert(message); |
183 | ||
409856d3 | 184 | if (nl->rqueue_size <= 0) { |
1b89cf56 | 185 | /* Try to read a new message */ |
409856d3 | 186 | r = socket_read_message(nl); |
71994cff | 187 | if (r == -ENOBUFS) { /* FIXME: ignore buffer overruns for now */ |
409856d3 | 188 | log_debug_errno(r, "sd-netlink: Got ENOBUFS from netlink socket, ignoring."); |
71994cff LP |
189 | return 1; |
190 | } | |
1b89cf56 TG |
191 | if (r <= 0) |
192 | return r; | |
4555ec72 TG |
193 | } |
194 | ||
1b89cf56 | 195 | /* Dispatch a queued message */ |
409856d3 YW |
196 | *message = nl->rqueue[0]; |
197 | nl->rqueue_size--; | |
198 | memmove(nl->rqueue, nl->rqueue + 1, sizeof(sd_netlink_message*) * nl->rqueue_size); | |
4555ec72 TG |
199 | |
200 | return 1; | |
201 | } | |
202 | ||
409856d3 | 203 | static int process_timeout(sd_netlink *nl) { |
4afd3348 | 204 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
e16bcf98 | 205 | struct reply_callback *c; |
ee38400b | 206 | sd_netlink_slot *slot; |
e16bcf98 TG |
207 | usec_t n; |
208 | int r; | |
209 | ||
409856d3 | 210 | assert(nl); |
e16bcf98 | 211 | |
409856d3 | 212 | c = prioq_peek(nl->reply_callbacks_prioq); |
e16bcf98 TG |
213 | if (!c) |
214 | return 0; | |
215 | ||
216 | n = now(CLOCK_MONOTONIC); | |
217 | if (c->timeout > n) | |
218 | return 0; | |
219 | ||
409856d3 | 220 | r = message_new_synthetic_error(nl, -ETIMEDOUT, c->serial, &m); |
e16bcf98 TG |
221 | if (r < 0) |
222 | return r; | |
223 | ||
409856d3 | 224 | assert_se(prioq_pop(nl->reply_callbacks_prioq) == c); |
ee38400b | 225 | c->timeout = 0; |
409856d3 | 226 | hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(c->serial)); |
e16bcf98 | 227 | |
ee38400b YW |
228 | slot = container_of(c, sd_netlink_slot, reply_callback); |
229 | ||
409856d3 | 230 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 231 | if (r < 0) |
8190a388 YW |
232 | log_debug_errno(r, "sd-netlink: timedout callback %s%s%sfailed: %m", |
233 | slot->description ? "'" : "", | |
234 | strempty(slot->description), | |
235 | slot->description ? "' " : ""); | |
233ba5c3 | 236 | |
ee38400b YW |
237 | if (slot->floating) |
238 | netlink_slot_disconnect(slot, true); | |
e16bcf98 | 239 | |
233ba5c3 | 240 | return 1; |
e16bcf98 TG |
241 | } |
242 | ||
409856d3 | 243 | static int process_reply(sd_netlink *nl, sd_netlink_message *m) { |
ee38400b YW |
244 | struct reply_callback *c; |
245 | sd_netlink_slot *slot; | |
b522c4b9 | 246 | uint32_t serial; |
ea342a99 | 247 | uint16_t type; |
e16bcf98 TG |
248 | int r; |
249 | ||
409856d3 | 250 | assert(nl); |
e16bcf98 TG |
251 | assert(m); |
252 | ||
409856d3 YW |
253 | serial = message_get_serial(m); |
254 | c = hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(serial)); | |
e16bcf98 TG |
255 | if (!c) |
256 | return 0; | |
257 | ||
ee38400b | 258 | if (c->timeout != 0) { |
409856d3 | 259 | prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx); |
ee38400b YW |
260 | c->timeout = 0; |
261 | } | |
e16bcf98 | 262 | |
1c4baffc | 263 | r = sd_netlink_message_get_type(m, &type); |
ea342a99 | 264 | if (r < 0) |
ee38400b | 265 | return r; |
ea342a99 AR |
266 | |
267 | if (type == NLMSG_DONE) | |
268 | m = NULL; | |
269 | ||
ee38400b YW |
270 | slot = container_of(c, sd_netlink_slot, reply_callback); |
271 | ||
409856d3 | 272 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 273 | if (r < 0) |
8190a388 YW |
274 | log_debug_errno(r, "sd-netlink: reply callback %s%s%sfailed: %m", |
275 | slot->description ? "'" : "", | |
276 | strempty(slot->description), | |
277 | slot->description ? "' " : ""); | |
233ba5c3 | 278 | |
ee38400b YW |
279 | if (slot->floating) |
280 | netlink_slot_disconnect(slot, true); | |
545bab1f | 281 | |
233ba5c3 | 282 | return 1; |
e16bcf98 TG |
283 | } |
284 | ||
409856d3 | 285 | static int process_match(sd_netlink *nl, sd_netlink_message *m) { |
8cec01b9 | 286 | uint16_t type; |
e1578f60 | 287 | uint8_t cmd; |
8cec01b9 TG |
288 | int r; |
289 | ||
409856d3 | 290 | assert(nl); |
8cec01b9 TG |
291 | assert(m); |
292 | ||
1c4baffc | 293 | r = sd_netlink_message_get_type(m, &type); |
8cec01b9 TG |
294 | if (r < 0) |
295 | return r; | |
296 | ||
e1578f60 YW |
297 | if (m->protocol == NETLINK_GENERIC) { |
298 | r = sd_genl_message_get_command(nl, m, &cmd); | |
299 | if (r < 0) | |
300 | return r; | |
301 | } else | |
302 | cmd = 0; | |
303 | ||
409856d3 | 304 | LIST_FOREACH(match_callbacks, c, nl->match_callbacks) { |
e1578f60 | 305 | sd_netlink_slot *slot; |
4d4d898a | 306 | bool found = false; |
e1578f60 YW |
307 | |
308 | if (c->type != type) | |
309 | continue; | |
310 | if (c->cmd != 0 && c->cmd != cmd) | |
baf78f1a LP |
311 | continue; |
312 | ||
4d4d898a YW |
313 | for (size_t i = 0; i < c->n_groups; i++) |
314 | if (c->groups[i] == m->multicast_group) { | |
315 | found = true; | |
316 | break; | |
317 | } | |
318 | ||
319 | if (!found) | |
320 | continue; | |
321 | ||
baf78f1a LP |
322 | slot = container_of(c, sd_netlink_slot, match_callback); |
323 | ||
409856d3 | 324 | r = c->callback(nl, m, slot->userdata); |
baf78f1a LP |
325 | if (r < 0) |
326 | log_debug_errno(r, "sd-netlink: match callback %s%s%sfailed: %m", | |
327 | slot->description ? "'" : "", | |
328 | strempty(slot->description), | |
329 | slot->description ? "' " : ""); | |
330 | if (r != 0) | |
331 | break; | |
8cec01b9 TG |
332 | } |
333 | ||
233ba5c3 | 334 | return 1; |
8cec01b9 TG |
335 | } |
336 | ||
409856d3 | 337 | static int process_running(sd_netlink *nl, sd_netlink_message **ret) { |
4afd3348 | 338 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 TG |
339 | int r; |
340 | ||
409856d3 | 341 | assert(nl); |
9d0db178 | 342 | |
409856d3 | 343 | r = process_timeout(nl); |
e16bcf98 TG |
344 | if (r != 0) |
345 | goto null_message; | |
346 | ||
409856d3 | 347 | r = dispatch_rqueue(nl, &m); |
4555ec72 TG |
348 | if (r < 0) |
349 | return r; | |
350 | if (!m) | |
351 | goto null_message; | |
352 | ||
52888279 | 353 | if (sd_netlink_message_is_broadcast(m)) |
409856d3 | 354 | r = process_match(nl, m); |
52888279 | 355 | else |
409856d3 | 356 | r = process_reply(nl, m); |
52888279 YW |
357 | if (r != 0) |
358 | goto null_message; | |
8cec01b9 | 359 | |
4555ec72 | 360 | if (ret) { |
1cc6c93a | 361 | *ret = TAKE_PTR(m); |
4555ec72 TG |
362 | |
363 | return 1; | |
364 | } | |
365 | ||
366 | return 1; | |
367 | ||
368 | null_message: | |
369 | if (r >= 0 && ret) | |
370 | *ret = NULL; | |
371 | ||
372 | return r; | |
373 | } | |
e16bcf98 | 374 | |
409856d3 YW |
375 | int sd_netlink_process(sd_netlink *nl, sd_netlink_message **ret) { |
376 | NETLINK_DONT_DESTROY(nl); | |
4555ec72 TG |
377 | int r; |
378 | ||
409856d3 YW |
379 | assert_return(nl, -EINVAL); |
380 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
381 | assert_return(!nl->processing, -EBUSY); | |
4555ec72 | 382 | |
409856d3 YW |
383 | nl->processing = true; |
384 | r = process_running(nl, ret); | |
385 | nl->processing = false; | |
4555ec72 TG |
386 | |
387 | return r; | |
388 | } | |
389 | ||
390 | static usec_t calc_elapse(uint64_t usec) { | |
f5fbe71d | 391 | if (usec == UINT64_MAX) |
4555ec72 TG |
392 | return 0; |
393 | ||
394 | if (usec == 0) | |
409856d3 | 395 | usec = NETLINK_DEFAULT_TIMEOUT_USEC; |
4555ec72 | 396 | |
496db330 | 397 | return usec_add(now(CLOCK_MONOTONIC), usec); |
4555ec72 TG |
398 | } |
399 | ||
409856d3 | 400 | static int netlink_poll(sd_netlink *nl, bool need_more, usec_t timeout_usec) { |
3a43da28 | 401 | usec_t m = USEC_INFINITY; |
b4f2a5b1 TG |
402 | int r, e; |
403 | ||
409856d3 | 404 | assert(nl); |
4555ec72 | 405 | |
409856d3 | 406 | e = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
407 | if (e < 0) |
408 | return e; | |
4555ec72 | 409 | |
b4f2a5b1 TG |
410 | if (need_more) |
411 | /* Caller wants more data, and doesn't care about | |
412 | * what's been read or any other timeouts. */ | |
f55dc7c9 | 413 | e |= POLLIN; |
b4f2a5b1 TG |
414 | else { |
415 | usec_t until; | |
11537375 | 416 | |
b4f2a5b1 TG |
417 | /* Caller wants to process if there is something to |
418 | * process, but doesn't care otherwise */ | |
419 | ||
409856d3 | 420 | r = sd_netlink_get_timeout(nl, &until); |
b4f2a5b1 TG |
421 | if (r < 0) |
422 | return r; | |
65f568bb | 423 | |
11537375 YW |
424 | m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC)); |
425 | } | |
b4f2a5b1 | 426 | |
409856d3 | 427 | r = fd_wait_for_event(nl->fd, e, MIN(m, timeout_usec)); |
8d16f29b | 428 | if (r <= 0) |
0f2d351f | 429 | return r; |
4555ec72 | 430 | |
dad28bff | 431 | return 1; |
4555ec72 TG |
432 | } |
433 | ||
1c4baffc | 434 | int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
69858785 LP |
435 | int r; |
436 | ||
4555ec72 | 437 | assert_return(nl, -EINVAL); |
409856d3 | 438 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
4555ec72 TG |
439 | |
440 | if (nl->rqueue_size > 0) | |
441 | return 0; | |
442 | ||
69858785 LP |
443 | r = netlink_poll(nl, false, timeout_usec); |
444 | 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 */ | |
445 | return 1; | |
446 | return r; | |
4555ec72 TG |
447 | } |
448 | ||
e16bcf98 TG |
449 | static int timeout_compare(const void *a, const void *b) { |
450 | const struct reply_callback *x = a, *y = b; | |
451 | ||
452 | if (x->timeout != 0 && y->timeout == 0) | |
453 | return -1; | |
454 | ||
455 | if (x->timeout == 0 && y->timeout != 0) | |
456 | return 1; | |
457 | ||
9c57a73b | 458 | return CMP(x->timeout, y->timeout); |
e16bcf98 TG |
459 | } |
460 | ||
dd35a61c | 461 | int sd_netlink_call_async( |
545bab1f | 462 | sd_netlink *nl, |
ee38400b | 463 | sd_netlink_slot **ret_slot, |
545bab1f YW |
464 | sd_netlink_message *m, |
465 | sd_netlink_message_handler_t callback, | |
466 | sd_netlink_destroy_t destroy_callback, | |
467 | void *userdata, | |
8190a388 YW |
468 | uint64_t usec, |
469 | const char *description) { | |
2b012288 | 470 | |
ee38400b | 471 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
e16bcf98 TG |
472 | int r, k; |
473 | ||
474 | assert_return(nl, -EINVAL); | |
475 | assert_return(m, -EINVAL); | |
476 | assert_return(callback, -EINVAL); | |
409856d3 | 477 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
e16bcf98 | 478 | |
b522c4b9 LP |
479 | if (hashmap_size(nl->reply_callbacks) >= REPLY_CALLBACKS_MAX) |
480 | return -ERANGE; | |
481 | ||
482 | r = hashmap_ensure_allocated(&nl->reply_callbacks, &trivial_hash_ops); | |
e16bcf98 TG |
483 | if (r < 0) |
484 | return r; | |
485 | ||
f5fbe71d | 486 | if (usec != UINT64_MAX) { |
e16bcf98 TG |
487 | r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
488 | if (r < 0) | |
489 | return r; | |
490 | } | |
491 | ||
5cd67116 | 492 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_REPLY_CALLBACK, sizeof(struct reply_callback), userdata, description, &slot); |
8190a388 YW |
493 | if (r < 0) |
494 | return r; | |
e16bcf98 | 495 | |
ee38400b YW |
496 | slot->reply_callback.callback = callback; |
497 | slot->reply_callback.timeout = calc_elapse(usec); | |
e16bcf98 | 498 | |
b522c4b9 | 499 | k = sd_netlink_send(nl, m, &slot->reply_callback.serial); |
545bab1f | 500 | if (k < 0) |
e16bcf98 | 501 | return k; |
e16bcf98 | 502 | |
b522c4b9 | 503 | r = hashmap_put(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial), &slot->reply_callback); |
545bab1f | 504 | if (r < 0) |
e16bcf98 | 505 | return r; |
e16bcf98 | 506 | |
ee38400b YW |
507 | if (slot->reply_callback.timeout != 0) { |
508 | r = prioq_put(nl->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx); | |
f6bdbd9e | 509 | if (r < 0) { |
b522c4b9 | 510 | (void) hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial)); |
e16bcf98 TG |
511 | return r; |
512 | } | |
513 | } | |
514 | ||
40c864af | 515 | /* Set this at last. Otherwise, some failures in above would call destroy_callback but some would not. */ |
5cd67116 YW |
516 | slot->destroy_callback = destroy_callback; |
517 | ||
ee38400b YW |
518 | if (ret_slot) |
519 | *ret_slot = slot; | |
e16bcf98 | 520 | |
ee38400b | 521 | TAKE_PTR(slot); |
545bab1f | 522 | |
e16bcf98 TG |
523 | return k; |
524 | } | |
525 | ||
dd35a61c | 526 | int sd_netlink_read( |
409856d3 | 527 | sd_netlink *nl, |
2b012288 YW |
528 | uint32_t serial, |
529 | uint64_t usec, | |
530 | sd_netlink_message **ret) { | |
531 | ||
4555ec72 | 532 | usec_t timeout; |
4555ec72 TG |
533 | int r; |
534 | ||
409856d3 YW |
535 | assert_return(nl, -EINVAL); |
536 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4555ec72 TG |
537 | |
538 | timeout = calc_elapse(usec); | |
539 | ||
65f568bb | 540 | for (;;) { |
4555ec72 | 541 | usec_t left; |
65f568bb | 542 | |
409856d3 | 543 | for (unsigned i = 0; i < nl->rqueue_size; i++) { |
2b012288 | 544 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *incoming = NULL; |
1b89cf56 | 545 | uint32_t received_serial; |
2b012288 | 546 | uint16_t type; |
65f568bb | 547 | |
409856d3 | 548 | received_serial = message_get_serial(nl->rqueue[i]); |
2b012288 YW |
549 | if (received_serial != serial) |
550 | continue; | |
65f568bb | 551 | |
409856d3 | 552 | incoming = nl->rqueue[i]; |
ea342a99 | 553 | |
2b012288 | 554 | /* found a match, remove from rqueue and return it */ |
409856d3 YW |
555 | memmove(nl->rqueue + i, nl->rqueue + i + 1, |
556 | sizeof(sd_netlink_message*) * (nl->rqueue_size - i - 1)); | |
557 | nl->rqueue_size--; | |
ea342a99 | 558 | |
2b012288 YW |
559 | r = sd_netlink_message_get_errno(incoming); |
560 | if (r < 0) | |
561 | return r; | |
1b89cf56 | 562 | |
2b012288 YW |
563 | r = sd_netlink_message_get_type(incoming, &type); |
564 | if (r < 0) | |
565 | return r; | |
ea342a99 | 566 | |
2b012288 | 567 | if (type == NLMSG_DONE) { |
766417bd YW |
568 | if (ret) |
569 | *ret = NULL; | |
2b012288 | 570 | return 0; |
65f568bb | 571 | } |
2b012288 YW |
572 | |
573 | if (ret) | |
574 | *ret = TAKE_PTR(incoming); | |
575 | return 1; | |
65f568bb | 576 | } |
1b89cf56 | 577 | |
409856d3 | 578 | r = socket_read_message(nl); |
1b89cf56 TG |
579 | if (r < 0) |
580 | return r; | |
581 | if (r > 0) | |
6ff8806e | 582 | /* received message, so try to process straight away */ |
4555ec72 | 583 | continue; |
65f568bb | 584 | |
4555ec72 TG |
585 | if (timeout > 0) { |
586 | usec_t n; | |
587 | ||
588 | n = now(CLOCK_MONOTONIC); | |
589 | if (n >= timeout) | |
590 | return -ETIMEDOUT; | |
591 | ||
11537375 | 592 | left = usec_sub_unsigned(timeout, n); |
4555ec72 | 593 | } else |
11537375 | 594 | left = USEC_INFINITY; |
4555ec72 | 595 | |
409856d3 | 596 | r = netlink_poll(nl, true, left); |
4555ec72 TG |
597 | if (r < 0) |
598 | return r; | |
2b012288 | 599 | if (r == 0) |
b551ddd3 | 600 | return -ETIMEDOUT; |
b4f2a5b1 TG |
601 | } |
602 | } | |
603 | ||
dd35a61c | 604 | int sd_netlink_call( |
409856d3 | 605 | sd_netlink *nl, |
4df42cd9 FW |
606 | sd_netlink_message *message, |
607 | uint64_t usec, | |
608 | sd_netlink_message **ret) { | |
2b012288 | 609 | |
4df42cd9 FW |
610 | uint32_t serial; |
611 | int r; | |
612 | ||
409856d3 YW |
613 | assert_return(nl, -EINVAL); |
614 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4df42cd9 FW |
615 | assert_return(message, -EINVAL); |
616 | ||
409856d3 | 617 | r = sd_netlink_send(nl, message, &serial); |
4df42cd9 FW |
618 | if (r < 0) |
619 | return r; | |
620 | ||
409856d3 | 621 | return sd_netlink_read(nl, serial, usec, ret); |
4df42cd9 FW |
622 | } |
623 | ||
dd35a61c | 624 | int sd_netlink_get_events(sd_netlink *nl) { |
409856d3 YW |
625 | assert_return(nl, -EINVAL); |
626 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
b4f2a5b1 | 627 | |
409856d3 | 628 | return nl->rqueue_size == 0 ? POLLIN : 0; |
b4f2a5b1 TG |
629 | } |
630 | ||
dd35a61c | 631 | int sd_netlink_get_timeout(sd_netlink *nl, uint64_t *timeout_usec) { |
b4f2a5b1 TG |
632 | struct reply_callback *c; |
633 | ||
409856d3 | 634 | assert_return(nl, -EINVAL); |
b4f2a5b1 | 635 | assert_return(timeout_usec, -EINVAL); |
409856d3 | 636 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
b4f2a5b1 | 637 | |
409856d3 | 638 | if (nl->rqueue_size > 0) { |
b4f2a5b1 TG |
639 | *timeout_usec = 0; |
640 | return 1; | |
641 | } | |
642 | ||
409856d3 | 643 | c = prioq_peek(nl->reply_callbacks_prioq); |
b4f2a5b1 | 644 | if (!c) { |
f5fbe71d | 645 | *timeout_usec = UINT64_MAX; |
b4f2a5b1 TG |
646 | return 0; |
647 | } | |
648 | ||
649 | *timeout_usec = c->timeout; | |
650 | ||
651 | return 1; | |
652 | } | |
653 | ||
654 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
99534007 | 655 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
656 | int r; |
657 | ||
409856d3 | 658 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
659 | if (r < 0) |
660 | return r; | |
661 | ||
662 | return 1; | |
663 | } | |
664 | ||
665 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 666 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
667 | int r; |
668 | ||
409856d3 | 669 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
670 | if (r < 0) |
671 | return r; | |
672 | ||
673 | return 1; | |
674 | } | |
675 | ||
676 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
99534007 | 677 | sd_netlink *nl = ASSERT_PTR(userdata); |
40c864af | 678 | int r, enabled; |
b4f2a5b1 TG |
679 | usec_t until; |
680 | ||
681 | assert(s); | |
b4f2a5b1 | 682 | |
40c864af | 683 | r = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
684 | if (r < 0) |
685 | return r; | |
686 | ||
40c864af | 687 | r = sd_event_source_set_io_events(nl->io_event_source, r); |
b4f2a5b1 TG |
688 | if (r < 0) |
689 | return r; | |
b4f2a5b1 | 690 | |
40c864af ZJS |
691 | enabled = sd_netlink_get_timeout(nl, &until); |
692 | if (enabled < 0) | |
693 | return enabled; | |
694 | if (enabled > 0) { | |
695 | r = sd_event_source_set_time(nl->time_event_source, until); | |
696 | if (r < 0) | |
697 | return r; | |
b4f2a5b1 TG |
698 | } |
699 | ||
93c0a5ec ZJS |
700 | r = sd_event_source_set_enabled(nl->time_event_source, |
701 | enabled > 0 ? SD_EVENT_ONESHOT : SD_EVENT_OFF); | |
b4f2a5b1 TG |
702 | if (r < 0) |
703 | return r; | |
704 | ||
705 | return 1; | |
706 | } | |
707 | ||
dd35a61c | 708 | int sd_netlink_attach_event(sd_netlink *nl, sd_event *event, int64_t priority) { |
b4f2a5b1 TG |
709 | int r; |
710 | ||
409856d3 YW |
711 | assert_return(nl, -EINVAL); |
712 | assert_return(!nl->event, -EBUSY); | |
b4f2a5b1 | 713 | |
409856d3 YW |
714 | assert(!nl->io_event_source); |
715 | assert(!nl->time_event_source); | |
b4f2a5b1 TG |
716 | |
717 | if (event) | |
409856d3 | 718 | nl->event = sd_event_ref(event); |
b4f2a5b1 | 719 | else { |
409856d3 | 720 | r = sd_event_default(&nl->event); |
b4f2a5b1 TG |
721 | if (r < 0) |
722 | return r; | |
723 | } | |
724 | ||
409856d3 | 725 | r = sd_event_add_io(nl->event, &nl->io_event_source, nl->fd, 0, io_callback, nl); |
b4f2a5b1 TG |
726 | if (r < 0) |
727 | goto fail; | |
728 | ||
409856d3 | 729 | r = sd_event_source_set_priority(nl->io_event_source, priority); |
b4f2a5b1 TG |
730 | if (r < 0) |
731 | goto fail; | |
732 | ||
409856d3 | 733 | r = sd_event_source_set_description(nl->io_event_source, "netlink-receive-message"); |
9021bb9f TG |
734 | if (r < 0) |
735 | goto fail; | |
736 | ||
409856d3 | 737 | r = sd_event_source_set_prepare(nl->io_event_source, prepare_callback); |
b4f2a5b1 TG |
738 | if (r < 0) |
739 | goto fail; | |
740 | ||
409856d3 | 741 | r = sd_event_add_time(nl->event, &nl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, nl); |
b4f2a5b1 TG |
742 | if (r < 0) |
743 | goto fail; | |
744 | ||
409856d3 | 745 | r = sd_event_source_set_priority(nl->time_event_source, priority); |
b4f2a5b1 TG |
746 | if (r < 0) |
747 | goto fail; | |
748 | ||
409856d3 | 749 | r = sd_event_source_set_description(nl->time_event_source, "netlink-timer"); |
9021bb9f TG |
750 | if (r < 0) |
751 | goto fail; | |
752 | ||
b4f2a5b1 TG |
753 | return 0; |
754 | ||
755 | fail: | |
409856d3 | 756 | sd_netlink_detach_event(nl); |
b4f2a5b1 TG |
757 | return r; |
758 | } | |
759 | ||
dd35a61c | 760 | int sd_netlink_detach_event(sd_netlink *nl) { |
409856d3 YW |
761 | assert_return(nl, -EINVAL); |
762 | assert_return(nl->event, -ENXIO); | |
b4f2a5b1 | 763 | |
409856d3 | 764 | nl->io_event_source = sd_event_source_unref(nl->io_event_source); |
b4f2a5b1 | 765 | |
409856d3 | 766 | nl->time_event_source = sd_event_source_unref(nl->time_event_source); |
b4f2a5b1 | 767 | |
409856d3 | 768 | nl->event = sd_event_unref(nl->event); |
b4f2a5b1 TG |
769 | |
770 | return 0; | |
771 | } | |
8cec01b9 | 772 | |
3f60e448 YW |
773 | int netlink_add_match_internal( |
774 | sd_netlink *nl, | |
ee38400b | 775 | sd_netlink_slot **ret_slot, |
3f60e448 YW |
776 | const uint32_t *groups, |
777 | size_t n_groups, | |
ee38400b | 778 | uint16_t type, |
e1578f60 | 779 | uint8_t cmd, |
ee38400b YW |
780 | sd_netlink_message_handler_t callback, |
781 | sd_netlink_destroy_t destroy_callback, | |
8190a388 YW |
782 | void *userdata, |
783 | const char *description) { | |
409856d3 | 784 | |
ee38400b | 785 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
31710be5 | 786 | int r; |
8cec01b9 | 787 | |
3f60e448 YW |
788 | assert(groups); |
789 | assert(n_groups > 0); | |
790 | ||
791 | for (size_t i = 0; i < n_groups; i++) { | |
792 | r = socket_broadcast_group_ref(nl, groups[i]); | |
793 | if (r < 0) | |
794 | return r; | |
795 | } | |
8cec01b9 | 796 | |
3f60e448 YW |
797 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_MATCH_CALLBACK, sizeof(struct match_callback), |
798 | userdata, description, &slot); | |
8190a388 YW |
799 | if (r < 0) |
800 | return r; | |
8cec01b9 | 801 | |
3f60e448 YW |
802 | slot->match_callback.groups = newdup(uint32_t, groups, n_groups); |
803 | if (!slot->match_callback.groups) | |
804 | return -ENOMEM; | |
805 | ||
806 | slot->match_callback.n_groups = n_groups; | |
ee38400b YW |
807 | slot->match_callback.callback = callback; |
808 | slot->match_callback.type = type; | |
e1578f60 | 809 | slot->match_callback.cmd = cmd; |
8cec01b9 | 810 | |
3f60e448 YW |
811 | LIST_PREPEND(match_callbacks, nl->match_callbacks, &slot->match_callback); |
812 | ||
813 | /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ | |
814 | slot->destroy_callback = destroy_callback; | |
815 | ||
816 | if (ret_slot) | |
817 | *ret_slot = slot; | |
818 | ||
819 | TAKE_PTR(slot); | |
820 | return 0; | |
821 | } | |
822 | ||
dd35a61c | 823 | int sd_netlink_add_match( |
3f60e448 YW |
824 | sd_netlink *rtnl, |
825 | sd_netlink_slot **ret_slot, | |
826 | uint16_t type, | |
827 | sd_netlink_message_handler_t callback, | |
828 | sd_netlink_destroy_t destroy_callback, | |
829 | void *userdata, | |
830 | const char *description) { | |
831 | ||
832 | static const uint32_t | |
833 | address_groups[] = { RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR, }, | |
834 | link_groups[] = { RTNLGRP_LINK, }, | |
835 | neighbor_groups[] = { RTNLGRP_NEIGH, }, | |
836 | nexthop_groups[] = { RTNLGRP_NEXTHOP, }, | |
837 | route_groups[] = { RTNLGRP_IPV4_ROUTE, RTNLGRP_IPV6_ROUTE, }, | |
27e93a4b YW |
838 | rule_groups[] = { RTNLGRP_IPV4_RULE, RTNLGRP_IPV6_RULE, }, |
839 | tc_groups[] = { RTNLGRP_TC }; | |
3f60e448 YW |
840 | const uint32_t *groups; |
841 | size_t n_groups; | |
842 | ||
843 | assert_return(rtnl, -EINVAL); | |
844 | assert_return(callback, -EINVAL); | |
845 | assert_return(!netlink_pid_changed(rtnl), -ECHILD); | |
846 | ||
31710be5 TG |
847 | switch (type) { |
848 | case RTM_NEWLINK: | |
31710be5 | 849 | case RTM_DELLINK: |
3f60e448 YW |
850 | groups = link_groups; |
851 | n_groups = ELEMENTSOF(link_groups); | |
31710be5 TG |
852 | break; |
853 | case RTM_NEWADDR: | |
31710be5 | 854 | case RTM_DELADDR: |
3f60e448 YW |
855 | groups = address_groups; |
856 | n_groups = ELEMENTSOF(address_groups); | |
d1bdafd2 WKI |
857 | break; |
858 | case RTM_NEWNEIGH: | |
859 | case RTM_DELNEIGH: | |
3f60e448 YW |
860 | groups = neighbor_groups; |
861 | n_groups = ELEMENTSOF(neighbor_groups); | |
31710be5 | 862 | break; |
87e4c847 TG |
863 | case RTM_NEWROUTE: |
864 | case RTM_DELROUTE: | |
3f60e448 YW |
865 | groups = route_groups; |
866 | n_groups = ELEMENTSOF(route_groups); | |
87e4c847 | 867 | break; |
bce67bbe SS |
868 | case RTM_NEWRULE: |
869 | case RTM_DELRULE: | |
3f60e448 YW |
870 | groups = rule_groups; |
871 | n_groups = ELEMENTSOF(rule_groups); | |
bce67bbe | 872 | break; |
c16c7808 SS |
873 | case RTM_NEWNEXTHOP: |
874 | case RTM_DELNEXTHOP: | |
3f60e448 YW |
875 | groups = nexthop_groups; |
876 | n_groups = ELEMENTSOF(nexthop_groups); | |
877 | break; | |
27e93a4b YW |
878 | case RTM_NEWQDISC: |
879 | case RTM_DELQDISC: | |
880 | case RTM_NEWTCLASS: | |
881 | case RTM_DELTCLASS: | |
882 | groups = tc_groups; | |
883 | n_groups = ELEMENTSOF(tc_groups); | |
884 | break; | |
31710be5 TG |
885 | default: |
886 | return -EOPNOTSUPP; | |
887 | } | |
888 | ||
e1578f60 | 889 | return netlink_add_match_internal(rtnl, ret_slot, groups, n_groups, type, 0, callback, |
3f60e448 | 890 | destroy_callback, userdata, description); |
8cec01b9 | 891 | } |
dc317a9a | 892 | |
dd35a61c | 893 | int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter) { |
dc317a9a YW |
894 | assert_return(nl, -EINVAL); |
895 | assert_return(len == 0 || filter, -EINVAL); | |
896 | ||
897 | if (setsockopt(nl->fd, SOL_SOCKET, | |
898 | len == 0 ? SO_DETACH_FILTER : SO_ATTACH_FILTER, | |
899 | &(struct sock_fprog) { | |
900 | .len = len, | |
f4f81a6b | 901 | .filter = (struct sock_filter*) filter, |
dc317a9a YW |
902 | }, sizeof(struct sock_fprog)) < 0) |
903 | return -errno; | |
904 | ||
905 | return 0; | |
906 | } |