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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); |
409856d3 | 218 | hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(c->serial)); |
e16bcf98 | 219 | |
ee38400b YW |
220 | slot = container_of(c, sd_netlink_slot, reply_callback); |
221 | ||
409856d3 | 222 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 223 | if (r < 0) |
8190a388 YW |
224 | log_debug_errno(r, "sd-netlink: timedout callback %s%s%sfailed: %m", |
225 | slot->description ? "'" : "", | |
226 | strempty(slot->description), | |
227 | slot->description ? "' " : ""); | |
233ba5c3 | 228 | |
ee38400b YW |
229 | if (slot->floating) |
230 | netlink_slot_disconnect(slot, true); | |
e16bcf98 | 231 | |
233ba5c3 | 232 | return 1; |
e16bcf98 TG |
233 | } |
234 | ||
409856d3 | 235 | static int process_reply(sd_netlink *nl, sd_netlink_message *m) { |
ee38400b YW |
236 | struct reply_callback *c; |
237 | sd_netlink_slot *slot; | |
b522c4b9 | 238 | uint32_t serial; |
ea342a99 | 239 | uint16_t type; |
e16bcf98 TG |
240 | int r; |
241 | ||
409856d3 | 242 | assert(nl); |
e16bcf98 TG |
243 | assert(m); |
244 | ||
409856d3 YW |
245 | serial = message_get_serial(m); |
246 | c = hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(serial)); | |
e16bcf98 TG |
247 | if (!c) |
248 | return 0; | |
249 | ||
f5c61588 | 250 | if (c->timeout != USEC_INFINITY) |
409856d3 | 251 | prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx); |
e16bcf98 | 252 | |
1c4baffc | 253 | r = sd_netlink_message_get_type(m, &type); |
ea342a99 | 254 | if (r < 0) |
ee38400b | 255 | return r; |
ea342a99 AR |
256 | |
257 | if (type == NLMSG_DONE) | |
258 | m = NULL; | |
259 | ||
ee38400b YW |
260 | slot = container_of(c, sd_netlink_slot, reply_callback); |
261 | ||
409856d3 | 262 | r = c->callback(nl, m, slot->userdata); |
233ba5c3 | 263 | if (r < 0) |
8190a388 YW |
264 | log_debug_errno(r, "sd-netlink: reply callback %s%s%sfailed: %m", |
265 | slot->description ? "'" : "", | |
266 | strempty(slot->description), | |
267 | slot->description ? "' " : ""); | |
233ba5c3 | 268 | |
ee38400b YW |
269 | if (slot->floating) |
270 | netlink_slot_disconnect(slot, true); | |
545bab1f | 271 | |
233ba5c3 | 272 | return 1; |
e16bcf98 TG |
273 | } |
274 | ||
409856d3 | 275 | static int process_match(sd_netlink *nl, sd_netlink_message *m) { |
8cec01b9 | 276 | uint16_t type; |
e1578f60 | 277 | uint8_t cmd; |
8cec01b9 TG |
278 | int r; |
279 | ||
409856d3 | 280 | assert(nl); |
8cec01b9 TG |
281 | assert(m); |
282 | ||
1c4baffc | 283 | r = sd_netlink_message_get_type(m, &type); |
8cec01b9 TG |
284 | if (r < 0) |
285 | return r; | |
286 | ||
e1578f60 YW |
287 | if (m->protocol == NETLINK_GENERIC) { |
288 | r = sd_genl_message_get_command(nl, m, &cmd); | |
289 | if (r < 0) | |
290 | return r; | |
291 | } else | |
292 | cmd = 0; | |
293 | ||
409856d3 | 294 | LIST_FOREACH(match_callbacks, c, nl->match_callbacks) { |
e1578f60 | 295 | sd_netlink_slot *slot; |
4d4d898a | 296 | bool found = false; |
e1578f60 YW |
297 | |
298 | if (c->type != type) | |
299 | continue; | |
300 | if (c->cmd != 0 && c->cmd != cmd) | |
baf78f1a LP |
301 | continue; |
302 | ||
4d4d898a YW |
303 | for (size_t i = 0; i < c->n_groups; i++) |
304 | if (c->groups[i] == m->multicast_group) { | |
305 | found = true; | |
306 | break; | |
307 | } | |
308 | ||
309 | if (!found) | |
310 | continue; | |
311 | ||
baf78f1a LP |
312 | slot = container_of(c, sd_netlink_slot, match_callback); |
313 | ||
409856d3 | 314 | r = c->callback(nl, m, slot->userdata); |
baf78f1a LP |
315 | if (r < 0) |
316 | log_debug_errno(r, "sd-netlink: match callback %s%s%sfailed: %m", | |
317 | slot->description ? "'" : "", | |
318 | strempty(slot->description), | |
319 | slot->description ? "' " : ""); | |
320 | if (r != 0) | |
321 | break; | |
8cec01b9 TG |
322 | } |
323 | ||
233ba5c3 | 324 | return 1; |
8cec01b9 TG |
325 | } |
326 | ||
409856d3 | 327 | static int process_running(sd_netlink *nl, sd_netlink_message **ret) { |
4afd3348 | 328 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 TG |
329 | int r; |
330 | ||
409856d3 | 331 | assert(nl); |
9d0db178 | 332 | |
409856d3 | 333 | r = process_timeout(nl); |
e16bcf98 TG |
334 | if (r != 0) |
335 | goto null_message; | |
336 | ||
409856d3 | 337 | r = dispatch_rqueue(nl, &m); |
4555ec72 TG |
338 | if (r < 0) |
339 | return r; | |
340 | if (!m) | |
341 | goto null_message; | |
342 | ||
52888279 | 343 | if (sd_netlink_message_is_broadcast(m)) |
409856d3 | 344 | r = process_match(nl, m); |
52888279 | 345 | else |
409856d3 | 346 | r = process_reply(nl, m); |
52888279 YW |
347 | if (r != 0) |
348 | goto null_message; | |
8cec01b9 | 349 | |
4555ec72 | 350 | if (ret) { |
1cc6c93a | 351 | *ret = TAKE_PTR(m); |
4555ec72 TG |
352 | |
353 | return 1; | |
354 | } | |
355 | ||
356 | return 1; | |
357 | ||
358 | null_message: | |
359 | if (r >= 0 && ret) | |
360 | *ret = NULL; | |
361 | ||
362 | return r; | |
363 | } | |
e16bcf98 | 364 | |
409856d3 YW |
365 | int sd_netlink_process(sd_netlink *nl, sd_netlink_message **ret) { |
366 | NETLINK_DONT_DESTROY(nl); | |
4555ec72 TG |
367 | int r; |
368 | ||
409856d3 YW |
369 | assert_return(nl, -EINVAL); |
370 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
371 | assert_return(!nl->processing, -EBUSY); | |
4555ec72 | 372 | |
409856d3 YW |
373 | nl->processing = true; |
374 | r = process_running(nl, ret); | |
375 | nl->processing = false; | |
4555ec72 TG |
376 | |
377 | return r; | |
378 | } | |
379 | ||
f5c61588 | 380 | static usec_t timespan_to_timestamp(usec_t usec) { |
4555ec72 | 381 | if (usec == 0) |
409856d3 | 382 | usec = NETLINK_DEFAULT_TIMEOUT_USEC; |
4555ec72 | 383 | |
496db330 | 384 | return usec_add(now(CLOCK_MONOTONIC), usec); |
4555ec72 TG |
385 | } |
386 | ||
409856d3 | 387 | static int netlink_poll(sd_netlink *nl, bool need_more, usec_t timeout_usec) { |
3a43da28 | 388 | usec_t m = USEC_INFINITY; |
b4f2a5b1 TG |
389 | int r, e; |
390 | ||
409856d3 | 391 | assert(nl); |
4555ec72 | 392 | |
409856d3 | 393 | e = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
394 | if (e < 0) |
395 | return e; | |
4555ec72 | 396 | |
b4f2a5b1 TG |
397 | if (need_more) |
398 | /* Caller wants more data, and doesn't care about | |
399 | * what's been read or any other timeouts. */ | |
f55dc7c9 | 400 | e |= POLLIN; |
b4f2a5b1 TG |
401 | else { |
402 | usec_t until; | |
11537375 | 403 | |
b4f2a5b1 TG |
404 | /* Caller wants to process if there is something to |
405 | * process, but doesn't care otherwise */ | |
406 | ||
409856d3 | 407 | r = sd_netlink_get_timeout(nl, &until); |
b4f2a5b1 TG |
408 | if (r < 0) |
409 | return r; | |
65f568bb | 410 | |
11537375 YW |
411 | m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC)); |
412 | } | |
b4f2a5b1 | 413 | |
409856d3 | 414 | r = fd_wait_for_event(nl->fd, e, MIN(m, timeout_usec)); |
8d16f29b | 415 | if (r <= 0) |
0f2d351f | 416 | return r; |
4555ec72 | 417 | |
dad28bff | 418 | return 1; |
4555ec72 TG |
419 | } |
420 | ||
1c4baffc | 421 | int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
69858785 LP |
422 | int r; |
423 | ||
4555ec72 | 424 | assert_return(nl, -EINVAL); |
409856d3 | 425 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
4555ec72 | 426 | |
e417c4ac | 427 | if (ordered_set_size(nl->rqueue) > 0) |
4555ec72 TG |
428 | return 0; |
429 | ||
69858785 | 430 | r = netlink_poll(nl, false, timeout_usec); |
13d84288 | 431 | if (ERRNO_IS_NEG_TRANSIENT(r)) /* Convert EINTR to "something happened" and give user a chance to run some code before calling back into us */ |
69858785 LP |
432 | return 1; |
433 | return r; | |
4555ec72 TG |
434 | } |
435 | ||
e16bcf98 TG |
436 | static int timeout_compare(const void *a, const void *b) { |
437 | const struct reply_callback *x = a, *y = b; | |
438 | ||
9c57a73b | 439 | return CMP(x->timeout, y->timeout); |
e16bcf98 TG |
440 | } |
441 | ||
dd35a61c | 442 | int sd_netlink_call_async( |
545bab1f | 443 | sd_netlink *nl, |
ee38400b | 444 | sd_netlink_slot **ret_slot, |
545bab1f YW |
445 | sd_netlink_message *m, |
446 | sd_netlink_message_handler_t callback, | |
447 | sd_netlink_destroy_t destroy_callback, | |
448 | void *userdata, | |
8190a388 YW |
449 | uint64_t usec, |
450 | const char *description) { | |
2b012288 | 451 | |
ee38400b | 452 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
e16bcf98 TG |
453 | int r, k; |
454 | ||
455 | assert_return(nl, -EINVAL); | |
456 | assert_return(m, -EINVAL); | |
457 | assert_return(callback, -EINVAL); | |
409856d3 | 458 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
e16bcf98 | 459 | |
b522c4b9 LP |
460 | if (hashmap_size(nl->reply_callbacks) >= REPLY_CALLBACKS_MAX) |
461 | return -ERANGE; | |
462 | ||
463 | r = hashmap_ensure_allocated(&nl->reply_callbacks, &trivial_hash_ops); | |
e16bcf98 TG |
464 | if (r < 0) |
465 | return r; | |
466 | ||
f5fbe71d | 467 | if (usec != UINT64_MAX) { |
e16bcf98 TG |
468 | r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
469 | if (r < 0) | |
470 | return r; | |
471 | } | |
472 | ||
5cd67116 | 473 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_REPLY_CALLBACK, sizeof(struct reply_callback), userdata, description, &slot); |
8190a388 YW |
474 | if (r < 0) |
475 | return r; | |
e16bcf98 | 476 | |
ee38400b | 477 | slot->reply_callback.callback = callback; |
f5c61588 | 478 | slot->reply_callback.timeout = timespan_to_timestamp(usec); |
e16bcf98 | 479 | |
b522c4b9 | 480 | k = sd_netlink_send(nl, m, &slot->reply_callback.serial); |
545bab1f | 481 | if (k < 0) |
e16bcf98 | 482 | return k; |
e16bcf98 | 483 | |
b522c4b9 | 484 | r = hashmap_put(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial), &slot->reply_callback); |
545bab1f | 485 | if (r < 0) |
e16bcf98 | 486 | return r; |
e16bcf98 | 487 | |
f5c61588 | 488 | if (slot->reply_callback.timeout != USEC_INFINITY) { |
ee38400b | 489 | r = prioq_put(nl->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx); |
f6bdbd9e | 490 | if (r < 0) { |
b522c4b9 | 491 | (void) hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial)); |
e16bcf98 TG |
492 | return r; |
493 | } | |
494 | } | |
495 | ||
40c864af | 496 | /* Set this at last. Otherwise, some failures in above would call destroy_callback but some would not. */ |
5cd67116 YW |
497 | slot->destroy_callback = destroy_callback; |
498 | ||
ee38400b YW |
499 | if (ret_slot) |
500 | *ret_slot = slot; | |
e16bcf98 | 501 | |
ee38400b | 502 | TAKE_PTR(slot); |
545bab1f | 503 | |
e16bcf98 TG |
504 | return k; |
505 | } | |
506 | ||
dd35a61c | 507 | int sd_netlink_read( |
409856d3 | 508 | sd_netlink *nl, |
2b012288 YW |
509 | uint32_t serial, |
510 | uint64_t usec, | |
511 | sd_netlink_message **ret) { | |
512 | ||
4555ec72 | 513 | usec_t timeout; |
4555ec72 TG |
514 | int r; |
515 | ||
409856d3 YW |
516 | assert_return(nl, -EINVAL); |
517 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4555ec72 | 518 | |
f5c61588 | 519 | timeout = timespan_to_timestamp(usec); |
4555ec72 | 520 | |
65f568bb | 521 | for (;;) { |
7b34bae3 | 522 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 | 523 | usec_t left; |
65f568bb | 524 | |
7b34bae3 YW |
525 | m = hashmap_remove(nl->rqueue_by_serial, UINT32_TO_PTR(serial)); |
526 | if (m) { | |
2b012288 | 527 | uint16_t type; |
65f568bb | 528 | |
2b012288 | 529 | /* found a match, remove from rqueue and return it */ |
7b34bae3 | 530 | sd_netlink_message_unref(ordered_set_remove(nl->rqueue, m)); |
ea342a99 | 531 | |
7b34bae3 | 532 | r = sd_netlink_message_get_errno(m); |
2b012288 YW |
533 | if (r < 0) |
534 | return r; | |
1b89cf56 | 535 | |
7b34bae3 | 536 | r = sd_netlink_message_get_type(m, &type); |
2b012288 YW |
537 | if (r < 0) |
538 | return r; | |
ea342a99 | 539 | |
2b012288 | 540 | if (type == NLMSG_DONE) { |
766417bd YW |
541 | if (ret) |
542 | *ret = NULL; | |
2b012288 | 543 | return 0; |
65f568bb | 544 | } |
2b012288 YW |
545 | |
546 | if (ret) | |
7b34bae3 | 547 | *ret = TAKE_PTR(m); |
2b012288 | 548 | return 1; |
65f568bb | 549 | } |
1b89cf56 | 550 | |
409856d3 | 551 | r = socket_read_message(nl); |
1b89cf56 TG |
552 | if (r < 0) |
553 | return r; | |
554 | if (r > 0) | |
6ff8806e | 555 | /* received message, so try to process straight away */ |
4555ec72 | 556 | continue; |
65f568bb | 557 | |
f5c61588 | 558 | if (timeout != USEC_INFINITY) { |
4555ec72 TG |
559 | usec_t n; |
560 | ||
561 | n = now(CLOCK_MONOTONIC); | |
562 | if (n >= timeout) | |
563 | return -ETIMEDOUT; | |
564 | ||
11537375 | 565 | left = usec_sub_unsigned(timeout, n); |
4555ec72 | 566 | } else |
11537375 | 567 | left = USEC_INFINITY; |
4555ec72 | 568 | |
409856d3 | 569 | r = netlink_poll(nl, true, left); |
4555ec72 TG |
570 | if (r < 0) |
571 | return r; | |
2b012288 | 572 | if (r == 0) |
b551ddd3 | 573 | return -ETIMEDOUT; |
b4f2a5b1 TG |
574 | } |
575 | } | |
576 | ||
dd35a61c | 577 | int sd_netlink_call( |
409856d3 | 578 | sd_netlink *nl, |
4df42cd9 FW |
579 | sd_netlink_message *message, |
580 | uint64_t usec, | |
581 | sd_netlink_message **ret) { | |
2b012288 | 582 | |
4df42cd9 FW |
583 | uint32_t serial; |
584 | int r; | |
585 | ||
409856d3 YW |
586 | assert_return(nl, -EINVAL); |
587 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4df42cd9 FW |
588 | assert_return(message, -EINVAL); |
589 | ||
409856d3 | 590 | r = sd_netlink_send(nl, message, &serial); |
4df42cd9 FW |
591 | if (r < 0) |
592 | return r; | |
593 | ||
409856d3 | 594 | return sd_netlink_read(nl, serial, usec, ret); |
4df42cd9 FW |
595 | } |
596 | ||
dd35a61c | 597 | int sd_netlink_get_events(sd_netlink *nl) { |
409856d3 YW |
598 | assert_return(nl, -EINVAL); |
599 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
b4f2a5b1 | 600 | |
e417c4ac | 601 | return ordered_set_size(nl->rqueue) == 0 ? POLLIN : 0; |
b4f2a5b1 TG |
602 | } |
603 | ||
dd35a61c | 604 | int sd_netlink_get_timeout(sd_netlink *nl, uint64_t *timeout_usec) { |
b4f2a5b1 TG |
605 | struct reply_callback *c; |
606 | ||
409856d3 | 607 | assert_return(nl, -EINVAL); |
b4f2a5b1 | 608 | assert_return(timeout_usec, -EINVAL); |
409856d3 | 609 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
b4f2a5b1 | 610 | |
e417c4ac | 611 | if (ordered_set_size(nl->rqueue) > 0) { |
b4f2a5b1 TG |
612 | *timeout_usec = 0; |
613 | return 1; | |
614 | } | |
615 | ||
409856d3 | 616 | c = prioq_peek(nl->reply_callbacks_prioq); |
b4f2a5b1 | 617 | if (!c) { |
f5fbe71d | 618 | *timeout_usec = UINT64_MAX; |
b4f2a5b1 TG |
619 | return 0; |
620 | } | |
621 | ||
622 | *timeout_usec = c->timeout; | |
b4f2a5b1 TG |
623 | return 1; |
624 | } | |
625 | ||
626 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
99534007 | 627 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
628 | int r; |
629 | ||
409856d3 | 630 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
631 | if (r < 0) |
632 | return r; | |
633 | ||
634 | return 1; | |
635 | } | |
636 | ||
637 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 638 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
639 | int r; |
640 | ||
409856d3 | 641 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
642 | if (r < 0) |
643 | return r; | |
644 | ||
645 | return 1; | |
646 | } | |
647 | ||
648 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
99534007 | 649 | sd_netlink *nl = ASSERT_PTR(userdata); |
40c864af | 650 | int r, enabled; |
b4f2a5b1 TG |
651 | usec_t until; |
652 | ||
653 | assert(s); | |
b4f2a5b1 | 654 | |
40c864af | 655 | r = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
656 | if (r < 0) |
657 | return r; | |
658 | ||
40c864af | 659 | r = sd_event_source_set_io_events(nl->io_event_source, r); |
b4f2a5b1 TG |
660 | if (r < 0) |
661 | return r; | |
b4f2a5b1 | 662 | |
40c864af ZJS |
663 | enabled = sd_netlink_get_timeout(nl, &until); |
664 | if (enabled < 0) | |
665 | return enabled; | |
666 | if (enabled > 0) { | |
667 | r = sd_event_source_set_time(nl->time_event_source, until); | |
668 | if (r < 0) | |
669 | return r; | |
b4f2a5b1 TG |
670 | } |
671 | ||
93c0a5ec ZJS |
672 | r = sd_event_source_set_enabled(nl->time_event_source, |
673 | enabled > 0 ? SD_EVENT_ONESHOT : SD_EVENT_OFF); | |
b4f2a5b1 TG |
674 | if (r < 0) |
675 | return r; | |
676 | ||
677 | return 1; | |
678 | } | |
679 | ||
dd35a61c | 680 | int sd_netlink_attach_event(sd_netlink *nl, sd_event *event, int64_t priority) { |
b4f2a5b1 TG |
681 | int r; |
682 | ||
409856d3 YW |
683 | assert_return(nl, -EINVAL); |
684 | assert_return(!nl->event, -EBUSY); | |
b4f2a5b1 | 685 | |
409856d3 YW |
686 | assert(!nl->io_event_source); |
687 | assert(!nl->time_event_source); | |
b4f2a5b1 TG |
688 | |
689 | if (event) | |
409856d3 | 690 | nl->event = sd_event_ref(event); |
b4f2a5b1 | 691 | else { |
409856d3 | 692 | r = sd_event_default(&nl->event); |
b4f2a5b1 TG |
693 | if (r < 0) |
694 | return r; | |
695 | } | |
696 | ||
409856d3 | 697 | r = sd_event_add_io(nl->event, &nl->io_event_source, nl->fd, 0, io_callback, nl); |
b4f2a5b1 TG |
698 | if (r < 0) |
699 | goto fail; | |
700 | ||
409856d3 | 701 | r = sd_event_source_set_priority(nl->io_event_source, priority); |
b4f2a5b1 TG |
702 | if (r < 0) |
703 | goto fail; | |
704 | ||
409856d3 | 705 | r = sd_event_source_set_description(nl->io_event_source, "netlink-receive-message"); |
9021bb9f TG |
706 | if (r < 0) |
707 | goto fail; | |
708 | ||
409856d3 | 709 | r = sd_event_source_set_prepare(nl->io_event_source, prepare_callback); |
b4f2a5b1 TG |
710 | if (r < 0) |
711 | goto fail; | |
712 | ||
409856d3 | 713 | r = sd_event_add_time(nl->event, &nl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, nl); |
b4f2a5b1 TG |
714 | if (r < 0) |
715 | goto fail; | |
716 | ||
409856d3 | 717 | r = sd_event_source_set_priority(nl->time_event_source, priority); |
b4f2a5b1 TG |
718 | if (r < 0) |
719 | goto fail; | |
720 | ||
409856d3 | 721 | r = sd_event_source_set_description(nl->time_event_source, "netlink-timer"); |
9021bb9f TG |
722 | if (r < 0) |
723 | goto fail; | |
724 | ||
b4f2a5b1 TG |
725 | return 0; |
726 | ||
727 | fail: | |
409856d3 | 728 | sd_netlink_detach_event(nl); |
b4f2a5b1 TG |
729 | return r; |
730 | } | |
731 | ||
dd35a61c | 732 | int sd_netlink_detach_event(sd_netlink *nl) { |
409856d3 YW |
733 | assert_return(nl, -EINVAL); |
734 | assert_return(nl->event, -ENXIO); | |
b4f2a5b1 | 735 | |
409856d3 | 736 | nl->io_event_source = sd_event_source_unref(nl->io_event_source); |
b4f2a5b1 | 737 | |
409856d3 | 738 | nl->time_event_source = sd_event_source_unref(nl->time_event_source); |
b4f2a5b1 | 739 | |
409856d3 | 740 | nl->event = sd_event_unref(nl->event); |
b4f2a5b1 TG |
741 | |
742 | return 0; | |
743 | } | |
8cec01b9 | 744 | |
3f60e448 YW |
745 | int netlink_add_match_internal( |
746 | sd_netlink *nl, | |
ee38400b | 747 | sd_netlink_slot **ret_slot, |
3f60e448 YW |
748 | const uint32_t *groups, |
749 | size_t n_groups, | |
ee38400b | 750 | uint16_t type, |
e1578f60 | 751 | uint8_t cmd, |
ee38400b YW |
752 | sd_netlink_message_handler_t callback, |
753 | sd_netlink_destroy_t destroy_callback, | |
8190a388 YW |
754 | void *userdata, |
755 | const char *description) { | |
409856d3 | 756 | |
ee38400b | 757 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
31710be5 | 758 | int r; |
8cec01b9 | 759 | |
3f60e448 YW |
760 | assert(groups); |
761 | assert(n_groups > 0); | |
762 | ||
763 | for (size_t i = 0; i < n_groups; i++) { | |
764 | r = socket_broadcast_group_ref(nl, groups[i]); | |
765 | if (r < 0) | |
766 | return r; | |
767 | } | |
8cec01b9 | 768 | |
3f60e448 YW |
769 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_MATCH_CALLBACK, sizeof(struct match_callback), |
770 | userdata, description, &slot); | |
8190a388 YW |
771 | if (r < 0) |
772 | return r; | |
8cec01b9 | 773 | |
3f60e448 YW |
774 | slot->match_callback.groups = newdup(uint32_t, groups, n_groups); |
775 | if (!slot->match_callback.groups) | |
776 | return -ENOMEM; | |
777 | ||
778 | slot->match_callback.n_groups = n_groups; | |
ee38400b YW |
779 | slot->match_callback.callback = callback; |
780 | slot->match_callback.type = type; | |
e1578f60 | 781 | slot->match_callback.cmd = cmd; |
8cec01b9 | 782 | |
3f60e448 YW |
783 | LIST_PREPEND(match_callbacks, nl->match_callbacks, &slot->match_callback); |
784 | ||
785 | /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ | |
786 | slot->destroy_callback = destroy_callback; | |
787 | ||
788 | if (ret_slot) | |
789 | *ret_slot = slot; | |
790 | ||
791 | TAKE_PTR(slot); | |
792 | return 0; | |
793 | } | |
794 | ||
dd35a61c | 795 | int sd_netlink_add_match( |
3f60e448 YW |
796 | sd_netlink *rtnl, |
797 | sd_netlink_slot **ret_slot, | |
798 | uint16_t type, | |
799 | sd_netlink_message_handler_t callback, | |
800 | sd_netlink_destroy_t destroy_callback, | |
801 | void *userdata, | |
802 | const char *description) { | |
803 | ||
804 | static const uint32_t | |
805 | address_groups[] = { RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR, }, | |
806 | link_groups[] = { RTNLGRP_LINK, }, | |
807 | neighbor_groups[] = { RTNLGRP_NEIGH, }, | |
808 | nexthop_groups[] = { RTNLGRP_NEXTHOP, }, | |
809 | route_groups[] = { RTNLGRP_IPV4_ROUTE, RTNLGRP_IPV6_ROUTE, }, | |
27e93a4b YW |
810 | rule_groups[] = { RTNLGRP_IPV4_RULE, RTNLGRP_IPV6_RULE, }, |
811 | tc_groups[] = { RTNLGRP_TC }; | |
3f60e448 YW |
812 | const uint32_t *groups; |
813 | size_t n_groups; | |
814 | ||
815 | assert_return(rtnl, -EINVAL); | |
816 | assert_return(callback, -EINVAL); | |
817 | assert_return(!netlink_pid_changed(rtnl), -ECHILD); | |
818 | ||
31710be5 TG |
819 | switch (type) { |
820 | case RTM_NEWLINK: | |
31710be5 | 821 | case RTM_DELLINK: |
3f60e448 YW |
822 | groups = link_groups; |
823 | n_groups = ELEMENTSOF(link_groups); | |
31710be5 TG |
824 | break; |
825 | case RTM_NEWADDR: | |
31710be5 | 826 | case RTM_DELADDR: |
3f60e448 YW |
827 | groups = address_groups; |
828 | n_groups = ELEMENTSOF(address_groups); | |
d1bdafd2 WKI |
829 | break; |
830 | case RTM_NEWNEIGH: | |
831 | case RTM_DELNEIGH: | |
3f60e448 YW |
832 | groups = neighbor_groups; |
833 | n_groups = ELEMENTSOF(neighbor_groups); | |
31710be5 | 834 | break; |
87e4c847 TG |
835 | case RTM_NEWROUTE: |
836 | case RTM_DELROUTE: | |
3f60e448 YW |
837 | groups = route_groups; |
838 | n_groups = ELEMENTSOF(route_groups); | |
87e4c847 | 839 | break; |
bce67bbe SS |
840 | case RTM_NEWRULE: |
841 | case RTM_DELRULE: | |
3f60e448 YW |
842 | groups = rule_groups; |
843 | n_groups = ELEMENTSOF(rule_groups); | |
bce67bbe | 844 | break; |
c16c7808 SS |
845 | case RTM_NEWNEXTHOP: |
846 | case RTM_DELNEXTHOP: | |
3f60e448 YW |
847 | groups = nexthop_groups; |
848 | n_groups = ELEMENTSOF(nexthop_groups); | |
849 | break; | |
27e93a4b YW |
850 | case RTM_NEWQDISC: |
851 | case RTM_DELQDISC: | |
852 | case RTM_NEWTCLASS: | |
853 | case RTM_DELTCLASS: | |
854 | groups = tc_groups; | |
855 | n_groups = ELEMENTSOF(tc_groups); | |
856 | break; | |
31710be5 TG |
857 | default: |
858 | return -EOPNOTSUPP; | |
859 | } | |
860 | ||
e1578f60 | 861 | return netlink_add_match_internal(rtnl, ret_slot, groups, n_groups, type, 0, callback, |
3f60e448 | 862 | destroy_callback, userdata, description); |
8cec01b9 | 863 | } |
dc317a9a | 864 | |
dd35a61c | 865 | int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter) { |
dc317a9a YW |
866 | assert_return(nl, -EINVAL); |
867 | assert_return(len == 0 || filter, -EINVAL); | |
868 | ||
869 | if (setsockopt(nl->fd, SOL_SOCKET, | |
870 | len == 0 ? SO_DETACH_FILTER : SO_ATTACH_FILTER, | |
871 | &(struct sock_fprog) { | |
872 | .len = len, | |
f4f81a6b | 873 | .filter = (struct sock_filter*) filter, |
dc317a9a YW |
874 | }, sizeof(struct sock_fprog)) < 0) |
875 | return -errno; | |
876 | ||
877 | return 0; | |
878 | } |