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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) { |
52afaee7 YW |
381 | static bool default_timeout_set = false; |
382 | static usec_t default_timeout; | |
383 | int r; | |
384 | ||
385 | if (usec == 0) { | |
386 | if (!default_timeout_set) { | |
387 | const char *e; | |
388 | ||
389 | default_timeout_set = true; | |
390 | default_timeout = NETLINK_DEFAULT_TIMEOUT_USEC; | |
391 | ||
0558c86c | 392 | e = secure_getenv("SYSTEMD_NETLINK_DEFAULT_TIMEOUT"); |
52afaee7 YW |
393 | if (e) { |
394 | r = parse_sec(e, &default_timeout); | |
395 | if (r < 0) | |
396 | log_debug_errno(r, "sd-netlink: Failed to parse $SYSTEMD_NETLINK_DEFAULT_TIMEOUT environment variable, ignoring: %m"); | |
397 | } | |
398 | } | |
399 | ||
400 | usec = default_timeout; | |
401 | } | |
4555ec72 | 402 | |
496db330 | 403 | return usec_add(now(CLOCK_MONOTONIC), usec); |
4555ec72 TG |
404 | } |
405 | ||
409856d3 | 406 | static int netlink_poll(sd_netlink *nl, bool need_more, usec_t timeout_usec) { |
3a43da28 | 407 | usec_t m = USEC_INFINITY; |
b4f2a5b1 TG |
408 | int r, e; |
409 | ||
409856d3 | 410 | assert(nl); |
4555ec72 | 411 | |
409856d3 | 412 | e = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
413 | if (e < 0) |
414 | return e; | |
4555ec72 | 415 | |
b4f2a5b1 TG |
416 | if (need_more) |
417 | /* Caller wants more data, and doesn't care about | |
418 | * what's been read or any other timeouts. */ | |
f55dc7c9 | 419 | e |= POLLIN; |
b4f2a5b1 TG |
420 | else { |
421 | usec_t until; | |
11537375 | 422 | |
b4f2a5b1 TG |
423 | /* Caller wants to process if there is something to |
424 | * process, but doesn't care otherwise */ | |
425 | ||
409856d3 | 426 | r = sd_netlink_get_timeout(nl, &until); |
b4f2a5b1 TG |
427 | if (r < 0) |
428 | return r; | |
65f568bb | 429 | |
11537375 YW |
430 | m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC)); |
431 | } | |
b4f2a5b1 | 432 | |
409856d3 | 433 | r = fd_wait_for_event(nl->fd, e, MIN(m, timeout_usec)); |
8d16f29b | 434 | if (r <= 0) |
0f2d351f | 435 | return r; |
4555ec72 | 436 | |
dad28bff | 437 | return 1; |
4555ec72 TG |
438 | } |
439 | ||
1c4baffc | 440 | int sd_netlink_wait(sd_netlink *nl, uint64_t timeout_usec) { |
69858785 LP |
441 | int r; |
442 | ||
4555ec72 | 443 | assert_return(nl, -EINVAL); |
409856d3 | 444 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
4555ec72 | 445 | |
e417c4ac | 446 | if (ordered_set_size(nl->rqueue) > 0) |
4555ec72 TG |
447 | return 0; |
448 | ||
69858785 | 449 | r = netlink_poll(nl, false, timeout_usec); |
13d84288 | 450 | 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 |
451 | return 1; |
452 | return r; | |
4555ec72 TG |
453 | } |
454 | ||
e16bcf98 TG |
455 | static int timeout_compare(const void *a, const void *b) { |
456 | const struct reply_callback *x = a, *y = b; | |
457 | ||
9c57a73b | 458 | return CMP(x->timeout, y->timeout); |
e16bcf98 TG |
459 | } |
460 | ||
4256379d YW |
461 | size_t netlink_get_reply_callback_count(sd_netlink *nl) { |
462 | assert(nl); | |
463 | ||
464 | return hashmap_size(nl->reply_callbacks); | |
465 | } | |
466 | ||
dd35a61c | 467 | int sd_netlink_call_async( |
545bab1f | 468 | sd_netlink *nl, |
ee38400b | 469 | sd_netlink_slot **ret_slot, |
545bab1f YW |
470 | sd_netlink_message *m, |
471 | sd_netlink_message_handler_t callback, | |
472 | sd_netlink_destroy_t destroy_callback, | |
473 | void *userdata, | |
8190a388 YW |
474 | uint64_t usec, |
475 | const char *description) { | |
2b012288 | 476 | |
ee38400b | 477 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
e16bcf98 TG |
478 | int r, k; |
479 | ||
480 | assert_return(nl, -EINVAL); | |
481 | assert_return(m, -EINVAL); | |
482 | assert_return(callback, -EINVAL); | |
409856d3 | 483 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
e16bcf98 | 484 | |
b522c4b9 | 485 | if (hashmap_size(nl->reply_callbacks) >= REPLY_CALLBACKS_MAX) |
4db7cb37 | 486 | return -EXFULL; |
b522c4b9 LP |
487 | |
488 | r = hashmap_ensure_allocated(&nl->reply_callbacks, &trivial_hash_ops); | |
e16bcf98 TG |
489 | if (r < 0) |
490 | return r; | |
491 | ||
f5fbe71d | 492 | if (usec != UINT64_MAX) { |
e16bcf98 TG |
493 | r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare); |
494 | if (r < 0) | |
495 | return r; | |
496 | } | |
497 | ||
5cd67116 | 498 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_REPLY_CALLBACK, sizeof(struct reply_callback), userdata, description, &slot); |
8190a388 YW |
499 | if (r < 0) |
500 | return r; | |
e16bcf98 | 501 | |
ee38400b | 502 | slot->reply_callback.callback = callback; |
f5c61588 | 503 | slot->reply_callback.timeout = timespan_to_timestamp(usec); |
e16bcf98 | 504 | |
b522c4b9 | 505 | k = sd_netlink_send(nl, m, &slot->reply_callback.serial); |
545bab1f | 506 | if (k < 0) |
e16bcf98 | 507 | return k; |
e16bcf98 | 508 | |
b522c4b9 | 509 | r = hashmap_put(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial), &slot->reply_callback); |
545bab1f | 510 | if (r < 0) |
e16bcf98 | 511 | return r; |
e16bcf98 | 512 | |
f5c61588 | 513 | if (slot->reply_callback.timeout != USEC_INFINITY) { |
ee38400b | 514 | r = prioq_put(nl->reply_callbacks_prioq, &slot->reply_callback, &slot->reply_callback.prioq_idx); |
f6bdbd9e | 515 | if (r < 0) { |
b522c4b9 | 516 | (void) hashmap_remove(nl->reply_callbacks, UINT32_TO_PTR(slot->reply_callback.serial)); |
e16bcf98 TG |
517 | return r; |
518 | } | |
519 | } | |
520 | ||
40c864af | 521 | /* Set this at last. Otherwise, some failures in above would call destroy_callback but some would not. */ |
5cd67116 YW |
522 | slot->destroy_callback = destroy_callback; |
523 | ||
ee38400b YW |
524 | if (ret_slot) |
525 | *ret_slot = slot; | |
e16bcf98 | 526 | |
ee38400b | 527 | TAKE_PTR(slot); |
545bab1f | 528 | |
e16bcf98 TG |
529 | return k; |
530 | } | |
531 | ||
dd35a61c | 532 | int sd_netlink_read( |
409856d3 | 533 | sd_netlink *nl, |
2b012288 YW |
534 | uint32_t serial, |
535 | uint64_t usec, | |
536 | sd_netlink_message **ret) { | |
537 | ||
4555ec72 | 538 | usec_t timeout; |
4555ec72 TG |
539 | int r; |
540 | ||
409856d3 YW |
541 | assert_return(nl, -EINVAL); |
542 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4555ec72 | 543 | |
f5c61588 | 544 | timeout = timespan_to_timestamp(usec); |
4555ec72 | 545 | |
65f568bb | 546 | for (;;) { |
7b34bae3 | 547 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; |
4555ec72 | 548 | usec_t left; |
65f568bb | 549 | |
7b34bae3 YW |
550 | m = hashmap_remove(nl->rqueue_by_serial, UINT32_TO_PTR(serial)); |
551 | if (m) { | |
2b012288 | 552 | uint16_t type; |
65f568bb | 553 | |
2b012288 | 554 | /* found a match, remove from rqueue and return it */ |
7b34bae3 | 555 | sd_netlink_message_unref(ordered_set_remove(nl->rqueue, m)); |
ea342a99 | 556 | |
7b34bae3 | 557 | r = sd_netlink_message_get_errno(m); |
2b012288 YW |
558 | if (r < 0) |
559 | return r; | |
1b89cf56 | 560 | |
7b34bae3 | 561 | r = sd_netlink_message_get_type(m, &type); |
2b012288 YW |
562 | if (r < 0) |
563 | return r; | |
ea342a99 | 564 | |
2b012288 | 565 | if (type == NLMSG_DONE) { |
766417bd YW |
566 | if (ret) |
567 | *ret = NULL; | |
2b012288 | 568 | return 0; |
65f568bb | 569 | } |
2b012288 YW |
570 | |
571 | if (ret) | |
7b34bae3 | 572 | *ret = TAKE_PTR(m); |
2b012288 | 573 | return 1; |
65f568bb | 574 | } |
1b89cf56 | 575 | |
409856d3 | 576 | r = socket_read_message(nl); |
1b89cf56 TG |
577 | if (r < 0) |
578 | return r; | |
579 | if (r > 0) | |
6ff8806e | 580 | /* received message, so try to process straight away */ |
4555ec72 | 581 | continue; |
65f568bb | 582 | |
f5c61588 | 583 | if (timeout != USEC_INFINITY) { |
4555ec72 TG |
584 | usec_t n; |
585 | ||
586 | n = now(CLOCK_MONOTONIC); | |
587 | if (n >= timeout) | |
588 | return -ETIMEDOUT; | |
589 | ||
11537375 | 590 | left = usec_sub_unsigned(timeout, n); |
4555ec72 | 591 | } else |
11537375 | 592 | left = USEC_INFINITY; |
4555ec72 | 593 | |
409856d3 | 594 | r = netlink_poll(nl, true, left); |
4555ec72 TG |
595 | if (r < 0) |
596 | return r; | |
2b012288 | 597 | if (r == 0) |
b551ddd3 | 598 | return -ETIMEDOUT; |
b4f2a5b1 TG |
599 | } |
600 | } | |
601 | ||
dd35a61c | 602 | int sd_netlink_call( |
409856d3 | 603 | sd_netlink *nl, |
4df42cd9 FW |
604 | sd_netlink_message *message, |
605 | uint64_t usec, | |
606 | sd_netlink_message **ret) { | |
2b012288 | 607 | |
4df42cd9 FW |
608 | uint32_t serial; |
609 | int r; | |
610 | ||
409856d3 YW |
611 | assert_return(nl, -EINVAL); |
612 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
4df42cd9 FW |
613 | assert_return(message, -EINVAL); |
614 | ||
409856d3 | 615 | r = sd_netlink_send(nl, message, &serial); |
4df42cd9 FW |
616 | if (r < 0) |
617 | return r; | |
618 | ||
409856d3 | 619 | return sd_netlink_read(nl, serial, usec, ret); |
4df42cd9 FW |
620 | } |
621 | ||
dd35a61c | 622 | int sd_netlink_get_events(sd_netlink *nl) { |
409856d3 YW |
623 | assert_return(nl, -EINVAL); |
624 | assert_return(!netlink_pid_changed(nl), -ECHILD); | |
b4f2a5b1 | 625 | |
e417c4ac | 626 | return ordered_set_size(nl->rqueue) == 0 ? POLLIN : 0; |
b4f2a5b1 TG |
627 | } |
628 | ||
dd35a61c | 629 | int sd_netlink_get_timeout(sd_netlink *nl, uint64_t *timeout_usec) { |
b4f2a5b1 TG |
630 | struct reply_callback *c; |
631 | ||
409856d3 | 632 | assert_return(nl, -EINVAL); |
b4f2a5b1 | 633 | assert_return(timeout_usec, -EINVAL); |
409856d3 | 634 | assert_return(!netlink_pid_changed(nl), -ECHILD); |
b4f2a5b1 | 635 | |
e417c4ac | 636 | if (ordered_set_size(nl->rqueue) > 0) { |
b4f2a5b1 TG |
637 | *timeout_usec = 0; |
638 | return 1; | |
639 | } | |
640 | ||
409856d3 | 641 | c = prioq_peek(nl->reply_callbacks_prioq); |
b4f2a5b1 | 642 | if (!c) { |
f5fbe71d | 643 | *timeout_usec = UINT64_MAX; |
b4f2a5b1 TG |
644 | return 0; |
645 | } | |
646 | ||
647 | *timeout_usec = c->timeout; | |
b4f2a5b1 TG |
648 | return 1; |
649 | } | |
650 | ||
651 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
99534007 | 652 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
653 | int r; |
654 | ||
409856d3 | 655 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
656 | if (r < 0) |
657 | return r; | |
658 | ||
659 | return 1; | |
660 | } | |
661 | ||
662 | static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 663 | sd_netlink *nl = ASSERT_PTR(userdata); |
b4f2a5b1 TG |
664 | int r; |
665 | ||
409856d3 | 666 | r = sd_netlink_process(nl, NULL); |
b4f2a5b1 TG |
667 | if (r < 0) |
668 | return r; | |
669 | ||
670 | return 1; | |
671 | } | |
672 | ||
673 | static int prepare_callback(sd_event_source *s, void *userdata) { | |
99534007 | 674 | sd_netlink *nl = ASSERT_PTR(userdata); |
40c864af | 675 | int r, enabled; |
b4f2a5b1 TG |
676 | usec_t until; |
677 | ||
678 | assert(s); | |
b4f2a5b1 | 679 | |
40c864af | 680 | r = sd_netlink_get_events(nl); |
b4f2a5b1 TG |
681 | if (r < 0) |
682 | return r; | |
683 | ||
40c864af | 684 | r = sd_event_source_set_io_events(nl->io_event_source, r); |
b4f2a5b1 TG |
685 | if (r < 0) |
686 | return r; | |
b4f2a5b1 | 687 | |
40c864af ZJS |
688 | enabled = sd_netlink_get_timeout(nl, &until); |
689 | if (enabled < 0) | |
690 | return enabled; | |
691 | if (enabled > 0) { | |
692 | r = sd_event_source_set_time(nl->time_event_source, until); | |
693 | if (r < 0) | |
694 | return r; | |
b4f2a5b1 TG |
695 | } |
696 | ||
93c0a5ec ZJS |
697 | r = sd_event_source_set_enabled(nl->time_event_source, |
698 | enabled > 0 ? SD_EVENT_ONESHOT : SD_EVENT_OFF); | |
b4f2a5b1 TG |
699 | if (r < 0) |
700 | return r; | |
701 | ||
702 | return 1; | |
703 | } | |
704 | ||
dd35a61c | 705 | int sd_netlink_attach_event(sd_netlink *nl, sd_event *event, int64_t priority) { |
b4f2a5b1 TG |
706 | int r; |
707 | ||
409856d3 YW |
708 | assert_return(nl, -EINVAL); |
709 | assert_return(!nl->event, -EBUSY); | |
b4f2a5b1 | 710 | |
409856d3 YW |
711 | assert(!nl->io_event_source); |
712 | assert(!nl->time_event_source); | |
b4f2a5b1 TG |
713 | |
714 | if (event) | |
409856d3 | 715 | nl->event = sd_event_ref(event); |
b4f2a5b1 | 716 | else { |
409856d3 | 717 | r = sd_event_default(&nl->event); |
b4f2a5b1 TG |
718 | if (r < 0) |
719 | return r; | |
720 | } | |
721 | ||
409856d3 | 722 | r = sd_event_add_io(nl->event, &nl->io_event_source, nl->fd, 0, io_callback, nl); |
b4f2a5b1 TG |
723 | if (r < 0) |
724 | goto fail; | |
725 | ||
409856d3 | 726 | r = sd_event_source_set_priority(nl->io_event_source, priority); |
b4f2a5b1 TG |
727 | if (r < 0) |
728 | goto fail; | |
729 | ||
409856d3 | 730 | r = sd_event_source_set_description(nl->io_event_source, "netlink-receive-message"); |
9021bb9f TG |
731 | if (r < 0) |
732 | goto fail; | |
733 | ||
409856d3 | 734 | r = sd_event_source_set_prepare(nl->io_event_source, prepare_callback); |
b4f2a5b1 TG |
735 | if (r < 0) |
736 | goto fail; | |
737 | ||
409856d3 | 738 | r = sd_event_add_time(nl->event, &nl->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, nl); |
b4f2a5b1 TG |
739 | if (r < 0) |
740 | goto fail; | |
741 | ||
409856d3 | 742 | r = sd_event_source_set_priority(nl->time_event_source, priority); |
b4f2a5b1 TG |
743 | if (r < 0) |
744 | goto fail; | |
745 | ||
409856d3 | 746 | r = sd_event_source_set_description(nl->time_event_source, "netlink-timer"); |
9021bb9f TG |
747 | if (r < 0) |
748 | goto fail; | |
749 | ||
b4f2a5b1 TG |
750 | return 0; |
751 | ||
752 | fail: | |
409856d3 | 753 | sd_netlink_detach_event(nl); |
b4f2a5b1 TG |
754 | return r; |
755 | } | |
756 | ||
dd35a61c | 757 | int sd_netlink_detach_event(sd_netlink *nl) { |
409856d3 YW |
758 | assert_return(nl, -EINVAL); |
759 | assert_return(nl->event, -ENXIO); | |
b4f2a5b1 | 760 | |
409856d3 | 761 | nl->io_event_source = sd_event_source_unref(nl->io_event_source); |
b4f2a5b1 | 762 | |
409856d3 | 763 | nl->time_event_source = sd_event_source_unref(nl->time_event_source); |
b4f2a5b1 | 764 | |
409856d3 | 765 | nl->event = sd_event_unref(nl->event); |
b4f2a5b1 TG |
766 | |
767 | return 0; | |
768 | } | |
8cec01b9 | 769 | |
0adb58c3 LP |
770 | sd_event* sd_netlink_get_event(sd_netlink *nl) { |
771 | assert_return(nl, NULL); | |
772 | ||
773 | return nl->event; | |
774 | } | |
775 | ||
3f60e448 YW |
776 | int netlink_add_match_internal( |
777 | sd_netlink *nl, | |
ee38400b | 778 | sd_netlink_slot **ret_slot, |
3f60e448 YW |
779 | const uint32_t *groups, |
780 | size_t n_groups, | |
ee38400b | 781 | uint16_t type, |
e1578f60 | 782 | uint8_t cmd, |
ee38400b YW |
783 | sd_netlink_message_handler_t callback, |
784 | sd_netlink_destroy_t destroy_callback, | |
8190a388 YW |
785 | void *userdata, |
786 | const char *description) { | |
409856d3 | 787 | |
ee38400b | 788 | _cleanup_free_ sd_netlink_slot *slot = NULL; |
31710be5 | 789 | int r; |
8cec01b9 | 790 | |
3f60e448 YW |
791 | assert(groups); |
792 | assert(n_groups > 0); | |
793 | ||
794 | for (size_t i = 0; i < n_groups; i++) { | |
795 | r = socket_broadcast_group_ref(nl, groups[i]); | |
796 | if (r < 0) | |
797 | return r; | |
798 | } | |
8cec01b9 | 799 | |
3f60e448 YW |
800 | r = netlink_slot_allocate(nl, !ret_slot, NETLINK_MATCH_CALLBACK, sizeof(struct match_callback), |
801 | userdata, description, &slot); | |
8190a388 YW |
802 | if (r < 0) |
803 | return r; | |
8cec01b9 | 804 | |
3f60e448 YW |
805 | slot->match_callback.groups = newdup(uint32_t, groups, n_groups); |
806 | if (!slot->match_callback.groups) | |
807 | return -ENOMEM; | |
808 | ||
809 | slot->match_callback.n_groups = n_groups; | |
ee38400b YW |
810 | slot->match_callback.callback = callback; |
811 | slot->match_callback.type = type; | |
e1578f60 | 812 | slot->match_callback.cmd = cmd; |
8cec01b9 | 813 | |
3f60e448 YW |
814 | LIST_PREPEND(match_callbacks, nl->match_callbacks, &slot->match_callback); |
815 | ||
816 | /* Set this at last. Otherwise, some failures in above call the destroy callback but some do not. */ | |
817 | slot->destroy_callback = destroy_callback; | |
818 | ||
819 | if (ret_slot) | |
820 | *ret_slot = slot; | |
821 | ||
822 | TAKE_PTR(slot); | |
823 | return 0; | |
824 | } | |
825 | ||
dd35a61c | 826 | int sd_netlink_add_match( |
3f60e448 YW |
827 | sd_netlink *rtnl, |
828 | sd_netlink_slot **ret_slot, | |
829 | uint16_t type, | |
830 | sd_netlink_message_handler_t callback, | |
831 | sd_netlink_destroy_t destroy_callback, | |
832 | void *userdata, | |
833 | const char *description) { | |
834 | ||
835 | static const uint32_t | |
836 | address_groups[] = { RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR, }, | |
837 | link_groups[] = { RTNLGRP_LINK, }, | |
838 | neighbor_groups[] = { RTNLGRP_NEIGH, }, | |
839 | nexthop_groups[] = { RTNLGRP_NEXTHOP, }, | |
840 | route_groups[] = { RTNLGRP_IPV4_ROUTE, RTNLGRP_IPV6_ROUTE, }, | |
27e93a4b YW |
841 | rule_groups[] = { RTNLGRP_IPV4_RULE, RTNLGRP_IPV6_RULE, }, |
842 | tc_groups[] = { RTNLGRP_TC }; | |
3f60e448 YW |
843 | const uint32_t *groups; |
844 | size_t n_groups; | |
845 | ||
846 | assert_return(rtnl, -EINVAL); | |
847 | assert_return(callback, -EINVAL); | |
848 | assert_return(!netlink_pid_changed(rtnl), -ECHILD); | |
849 | ||
31710be5 TG |
850 | switch (type) { |
851 | case RTM_NEWLINK: | |
31710be5 | 852 | case RTM_DELLINK: |
3f60e448 YW |
853 | groups = link_groups; |
854 | n_groups = ELEMENTSOF(link_groups); | |
31710be5 TG |
855 | break; |
856 | case RTM_NEWADDR: | |
31710be5 | 857 | case RTM_DELADDR: |
3f60e448 YW |
858 | groups = address_groups; |
859 | n_groups = ELEMENTSOF(address_groups); | |
d1bdafd2 WKI |
860 | break; |
861 | case RTM_NEWNEIGH: | |
862 | case RTM_DELNEIGH: | |
3f60e448 YW |
863 | groups = neighbor_groups; |
864 | n_groups = ELEMENTSOF(neighbor_groups); | |
31710be5 | 865 | break; |
87e4c847 TG |
866 | case RTM_NEWROUTE: |
867 | case RTM_DELROUTE: | |
3f60e448 YW |
868 | groups = route_groups; |
869 | n_groups = ELEMENTSOF(route_groups); | |
87e4c847 | 870 | break; |
bce67bbe SS |
871 | case RTM_NEWRULE: |
872 | case RTM_DELRULE: | |
3f60e448 YW |
873 | groups = rule_groups; |
874 | n_groups = ELEMENTSOF(rule_groups); | |
bce67bbe | 875 | break; |
c16c7808 SS |
876 | case RTM_NEWNEXTHOP: |
877 | case RTM_DELNEXTHOP: | |
3f60e448 YW |
878 | groups = nexthop_groups; |
879 | n_groups = ELEMENTSOF(nexthop_groups); | |
880 | break; | |
27e93a4b YW |
881 | case RTM_NEWQDISC: |
882 | case RTM_DELQDISC: | |
883 | case RTM_NEWTCLASS: | |
884 | case RTM_DELTCLASS: | |
885 | groups = tc_groups; | |
886 | n_groups = ELEMENTSOF(tc_groups); | |
887 | break; | |
31710be5 TG |
888 | default: |
889 | return -EOPNOTSUPP; | |
890 | } | |
891 | ||
e1578f60 | 892 | return netlink_add_match_internal(rtnl, ret_slot, groups, n_groups, type, 0, callback, |
3f60e448 | 893 | destroy_callback, userdata, description); |
8cec01b9 | 894 | } |
dc317a9a | 895 | |
dd35a61c | 896 | int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter) { |
dc317a9a YW |
897 | assert_return(nl, -EINVAL); |
898 | assert_return(len == 0 || filter, -EINVAL); | |
899 | ||
900 | if (setsockopt(nl->fd, SOL_SOCKET, | |
901 | len == 0 ? SO_DETACH_FILTER : SO_ATTACH_FILTER, | |
902 | &(struct sock_fprog) { | |
903 | .len = len, | |
f4f81a6b | 904 | .filter = (struct sock_filter*) filter, |
dc317a9a YW |
905 | }, sizeof(struct sock_fprog)) < 0) |
906 | return -errno; | |
907 | ||
908 | return 0; | |
909 | } |