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Commit | Line | Data |
---|---|---|
ad1ad5c8 | 1 | /*** |
34437b4f | 2 | This file is part of systemd. |
ad1ad5c8 | 3 | |
34437b4f LP |
4 | Copyright (C) 2014 Tom Gundersen |
5 | Copyright (C) 2014 Susant Sahani | |
ad1ad5c8 | 6 | |
34437b4f LP |
7 | systemd is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
ad1ad5c8 | 11 | |
34437b4f LP |
12 | systemd is distributed in the hope that it will be useful, but |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
ad1ad5c8 | 16 | |
34437b4f LP |
17 | You should have received a copy of the GNU Lesser General Public License |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
ad1ad5c8 SS |
19 | ***/ |
20 | ||
21 | #include <arpa/inet.h> | |
22 | ||
ad1ad5c8 | 23 | #include "sd-lldp.h" |
07630cea | 24 | |
b5efdb8a | 25 | #include "alloc-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
ad1ad5c8 | 27 | #include "lldp-internal.h" |
34437b4f | 28 | #include "lldp-neighbor.h" |
032b27f5 | 29 | #include "lldp-network.h" |
34437b4f | 30 | #include "socket-util.h" |
b553a6b1 | 31 | #include "ether-addr-util.h" |
49699bac | 32 | |
34437b4f | 33 | #define LLDP_DEFAULT_NEIGHBORS_MAX 128U |
032b27f5 | 34 | |
34437b4f LP |
35 | static void lldp_flush_neighbors(sd_lldp *lldp) { |
36 | sd_lldp_neighbor *n; | |
ad1ad5c8 SS |
37 | |
38 | assert(lldp); | |
ad1ad5c8 | 39 | |
34437b4f LP |
40 | while ((n = hashmap_first(lldp->neighbor_by_id))) |
41 | lldp_neighbor_unlink(n); | |
ad1ad5c8 SS |
42 | } |
43 | ||
90dffb22 LP |
44 | static void lldp_callback(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n) { |
45 | assert(lldp); | |
90dffb22 LP |
46 | |
47 | log_lldp("Invoking callback for '%c'.", event); | |
48 | ||
49 | if (!lldp->callback) | |
50 | return; | |
51 | ||
52 | lldp->callback(lldp, event, n, lldp->userdata); | |
53 | } | |
54 | ||
34437b4f | 55 | static int lldp_make_space(sd_lldp *lldp, size_t extra) { |
34437b4f LP |
56 | usec_t t = USEC_INFINITY; |
57 | bool changed = false; | |
ad1ad5c8 | 58 | |
34437b4f | 59 | assert(lldp); |
ad1ad5c8 | 60 | |
34437b4f LP |
61 | /* Remove all entries that are past their TTL, and more until at least the specified number of extra entries |
62 | * are free. */ | |
ad1ad5c8 | 63 | |
34437b4f | 64 | for (;;) { |
90dffb22 LP |
65 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL; |
66 | ||
34437b4f LP |
67 | n = prioq_peek(lldp->neighbor_by_expiry); |
68 | if (!n) | |
859c37b1 | 69 | break; |
859c37b1 | 70 | |
90dffb22 LP |
71 | sd_lldp_neighbor_ref(n); |
72 | ||
34437b4f LP |
73 | if (hashmap_size(lldp->neighbor_by_id) > LESS_BY(lldp->neighbors_max, extra)) |
74 | goto remove_one; | |
859c37b1 | 75 | |
34437b4f LP |
76 | if (t == USEC_INFINITY) |
77 | t = now(clock_boottime_or_monotonic()); | |
859c37b1 | 78 | |
34437b4f | 79 | if (n->until > t) |
859c37b1 | 80 | break; |
859c37b1 | 81 | |
34437b4f LP |
82 | remove_one: |
83 | lldp_neighbor_unlink(n); | |
90dffb22 | 84 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, n); |
34437b4f LP |
85 | changed = true; |
86 | } | |
859c37b1 | 87 | |
34437b4f LP |
88 | return changed; |
89 | } | |
ad1ad5c8 | 90 | |
90dffb22 LP |
91 | static bool lldp_keep_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) { |
92 | assert(lldp); | |
93 | assert(n); | |
94 | ||
95 | /* Don't keep data with a zero TTL */ | |
96 | if (n->ttl <= 0) | |
97 | return false; | |
98 | ||
99 | /* Filter out data from the filter address */ | |
100 | if (!ether_addr_is_null(&lldp->filter_address) && | |
101 | ether_addr_equal(&lldp->filter_address, &n->source_address)) | |
102 | return false; | |
103 | ||
104 | /* Only add if the neighbor has a capability we are interested in. Note that we also store all neighbors with | |
105 | * no caps field set. */ | |
106 | if (n->has_capabilities && | |
107 | (n->enabled_capabilities & lldp->capability_mask) == 0) | |
108 | return false; | |
109 | ||
110 | /* Keep everything else */ | |
111 | return true; | |
112 | } | |
113 | ||
0513ea4e TH |
114 | static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor); |
115 | ||
34437b4f | 116 | static int lldp_add_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) { |
90dffb22 LP |
117 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *old = NULL; |
118 | bool keep; | |
34437b4f | 119 | int r; |
ad1ad5c8 | 120 | |
34437b4f LP |
121 | assert(lldp); |
122 | assert(n); | |
123 | assert(!n->lldp); | |
124 | ||
90dffb22 LP |
125 | keep = lldp_keep_neighbor(lldp, n); |
126 | ||
34437b4f LP |
127 | /* First retrieve the old entry for this MSAP */ |
128 | old = hashmap_get(lldp->neighbor_by_id, &n->id); | |
129 | if (old) { | |
90dffb22 LP |
130 | sd_lldp_neighbor_ref(old); |
131 | ||
132 | if (!keep) { | |
133 | lldp_neighbor_unlink(old); | |
134 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old); | |
135 | return 0; | |
136 | } | |
137 | ||
34437b4f LP |
138 | if (lldp_neighbor_equal(n, old)) { |
139 | /* Is this equal, then restart the TTL counter, but don't do anyting else. */ | |
16fed825 | 140 | old->timestamp = n->timestamp; |
0513ea4e | 141 | lldp_start_timer(lldp, old); |
90dffb22 | 142 | lldp_callback(lldp, SD_LLDP_EVENT_REFRESHED, old); |
34437b4f | 143 | return 0; |
ad1ad5c8 | 144 | } |
34437b4f LP |
145 | |
146 | /* Data changed, remove the old entry, and add a new one */ | |
147 | lldp_neighbor_unlink(old); | |
ad1ad5c8 | 148 | |
90dffb22 LP |
149 | } else if (!keep) |
150 | return 0; | |
ad1ad5c8 | 151 | |
34437b4f LP |
152 | /* Then, make room for at least one new neighbor */ |
153 | lldp_make_space(lldp, 1); | |
ad1ad5c8 | 154 | |
34437b4f LP |
155 | r = hashmap_put(lldp->neighbor_by_id, &n->id, n); |
156 | if (r < 0) | |
90dffb22 | 157 | goto finish; |
ad1ad5c8 | 158 | |
34437b4f LP |
159 | r = prioq_put(lldp->neighbor_by_expiry, n, &n->prioq_idx); |
160 | if (r < 0) { | |
161 | assert_se(hashmap_remove(lldp->neighbor_by_id, &n->id) == n); | |
90dffb22 | 162 | goto finish; |
ad1ad5c8 SS |
163 | } |
164 | ||
34437b4f | 165 | n->lldp = lldp; |
ad1ad5c8 | 166 | |
0513ea4e | 167 | lldp_start_timer(lldp, n); |
90dffb22 LP |
168 | lldp_callback(lldp, old ? SD_LLDP_EVENT_UPDATED : SD_LLDP_EVENT_ADDED, n); |
169 | ||
170 | return 1; | |
171 | ||
172 | finish: | |
173 | if (old) | |
35ad2cd7 | 174 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old); |
90dffb22 LP |
175 | |
176 | return r; | |
ad1ad5c8 SS |
177 | } |
178 | ||
34437b4f LP |
179 | static int lldp_handle_datagram(sd_lldp *lldp, sd_lldp_neighbor *n) { |
180 | int r; | |
ad1ad5c8 | 181 | |
34437b4f LP |
182 | assert(lldp); |
183 | assert(n); | |
ad1ad5c8 | 184 | |
34437b4f LP |
185 | r = lldp_neighbor_parse(n); |
186 | if (r == -EBADMSG) /* Ignore bad messages */ | |
187 | return 0; | |
188 | if (r < 0) | |
189 | return r; | |
ad1ad5c8 | 190 | |
34437b4f LP |
191 | r = lldp_add_neighbor(lldp, n); |
192 | if (r < 0) { | |
193 | log_lldp_errno(r, "Failed to add datagram. Ignoring."); | |
194 | return 0; | |
ad1ad5c8 | 195 | } |
ad1ad5c8 | 196 | |
34437b4f | 197 | log_lldp("Successfully processed LLDP datagram."); |
34437b4f | 198 | return 0; |
ad1ad5c8 SS |
199 | } |
200 | ||
34437b4f LP |
201 | static int lldp_receive_datagram(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
202 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL; | |
203 | ssize_t space, length; | |
204 | sd_lldp *lldp = userdata; | |
16fed825 | 205 | struct timespec ts; |
49699bac | 206 | |
34437b4f | 207 | assert(fd >= 0); |
49699bac | 208 | assert(lldp); |
49699bac | 209 | |
34437b4f LP |
210 | space = next_datagram_size_fd(fd); |
211 | if (space < 0) | |
212 | return log_lldp_errno(space, "Failed to determine datagram size to read: %m"); | |
49699bac | 213 | |
34437b4f LP |
214 | n = lldp_neighbor_new(space); |
215 | if (!n) | |
216 | return -ENOMEM; | |
49699bac | 217 | |
34437b4f | 218 | length = recv(fd, LLDP_NEIGHBOR_RAW(n), n->raw_size, MSG_DONTWAIT); |
f3315c58 LP |
219 | if (length < 0) { |
220 | if (errno == EAGAIN || errno == EINTR) | |
221 | return 0; | |
222 | ||
34437b4f | 223 | return log_lldp_errno(errno, "Failed to read LLDP datagram: %m"); |
f3315c58 | 224 | } |
dacd6cee | 225 | |
34437b4f LP |
226 | if ((size_t) length != n->raw_size) { |
227 | log_lldp("Packet size mismatch."); | |
228 | return -EINVAL; | |
229 | } | |
49699bac | 230 | |
16fed825 LP |
231 | /* Try to get the timestamp of this packet if it is known */ |
232 | if (ioctl(fd, SIOCGSTAMPNS, &ts) >= 0) | |
233 | triple_timestamp_from_realtime(&n->timestamp, timespec_load(&ts)); | |
234 | else | |
235 | triple_timestamp_get(&n->timestamp); | |
236 | ||
34437b4f | 237 | return lldp_handle_datagram(lldp, n); |
49699bac SS |
238 | } |
239 | ||
fc6a313b LP |
240 | static void lldp_reset(sd_lldp *lldp) { |
241 | assert(lldp); | |
242 | ||
243 | lldp->timer_event_source = sd_event_source_unref(lldp->timer_event_source); | |
244 | lldp->io_event_source = sd_event_source_unref(lldp->io_event_source); | |
245 | lldp->fd = safe_close(lldp->fd); | |
246 | } | |
247 | ||
34437b4f | 248 | _public_ int sd_lldp_start(sd_lldp *lldp) { |
ad1ad5c8 SS |
249 | int r; |
250 | ||
251 | assert_return(lldp, -EINVAL); | |
fc6a313b LP |
252 | assert_return(lldp->event, -EINVAL); |
253 | assert_return(lldp->ifindex > 0, -EINVAL); | |
ad1ad5c8 | 254 | |
032b27f5 LP |
255 | if (lldp->fd >= 0) |
256 | return 0; | |
ad1ad5c8 | 257 | |
34437b4f | 258 | assert(!lldp->io_event_source); |
49699bac | 259 | |
032b27f5 LP |
260 | lldp->fd = lldp_network_bind_raw_socket(lldp->ifindex); |
261 | if (lldp->fd < 0) | |
262 | return lldp->fd; | |
263 | ||
fc6a313b LP |
264 | r = sd_event_add_io(lldp->event, &lldp->io_event_source, lldp->fd, EPOLLIN, lldp_receive_datagram, lldp); |
265 | if (r < 0) | |
266 | goto fail; | |
032b27f5 | 267 | |
fc6a313b LP |
268 | r = sd_event_source_set_priority(lldp->io_event_source, lldp->event_priority); |
269 | if (r < 0) | |
270 | goto fail; | |
032b27f5 | 271 | |
fc6a313b | 272 | (void) sd_event_source_set_description(lldp->io_event_source, "lldp-io"); |
ad1ad5c8 | 273 | |
fc6a313b | 274 | log_lldp("Started LLDP client"); |
032b27f5 LP |
275 | return 1; |
276 | ||
277 | fail: | |
fc6a313b | 278 | lldp_reset(lldp); |
032b27f5 | 279 | return r; |
ad1ad5c8 SS |
280 | } |
281 | ||
34437b4f | 282 | _public_ int sd_lldp_stop(sd_lldp *lldp) { |
ad1ad5c8 | 283 | assert_return(lldp, -EINVAL); |
ad1ad5c8 | 284 | |
032b27f5 LP |
285 | if (lldp->fd < 0) |
286 | return 0; | |
ad1ad5c8 | 287 | |
fc6a313b | 288 | log_lldp("Stopping LLDP client"); |
ad1ad5c8 | 289 | |
fc6a313b | 290 | lldp_reset(lldp); |
34437b4f | 291 | lldp_flush_neighbors(lldp); |
ad1ad5c8 | 292 | |
032b27f5 | 293 | return 1; |
ad1ad5c8 SS |
294 | } |
295 | ||
34437b4f | 296 | _public_ int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int64_t priority) { |
ad1ad5c8 SS |
297 | int r; |
298 | ||
299 | assert_return(lldp, -EINVAL); | |
032b27f5 LP |
300 | assert_return(lldp->fd < 0, -EBUSY); |
301 | assert_return(!lldp->event, -EBUSY); | |
ad1ad5c8 SS |
302 | |
303 | if (event) | |
032b27f5 | 304 | lldp->event = sd_event_ref(event); |
ad1ad5c8 | 305 | else { |
032b27f5 | 306 | r = sd_event_default(&lldp->event); |
ad1ad5c8 SS |
307 | if (r < 0) |
308 | return r; | |
309 | } | |
310 | ||
032b27f5 | 311 | lldp->event_priority = priority; |
ad1ad5c8 SS |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
34437b4f | 316 | _public_ int sd_lldp_detach_event(sd_lldp *lldp) { |
ad1ad5c8 SS |
317 | |
318 | assert_return(lldp, -EINVAL); | |
032b27f5 | 319 | assert_return(lldp->fd < 0, -EBUSY); |
ad1ad5c8 | 320 | |
032b27f5 | 321 | lldp->event = sd_event_unref(lldp->event); |
ad1ad5c8 SS |
322 | return 0; |
323 | } | |
324 | ||
3db2ec56 LP |
325 | _public_ sd_event* sd_lldp_get_event(sd_lldp *lldp) { |
326 | assert_return(lldp, NULL); | |
327 | ||
328 | return lldp->event; | |
329 | } | |
330 | ||
34437b4f | 331 | _public_ int sd_lldp_set_callback(sd_lldp *lldp, sd_lldp_callback_t cb, void *userdata) { |
49699bac SS |
332 | assert_return(lldp, -EINVAL); |
333 | ||
ccf86354 | 334 | lldp->callback = cb; |
49699bac SS |
335 | lldp->userdata = userdata; |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
fc6a313b LP |
340 | _public_ int sd_lldp_set_ifindex(sd_lldp *lldp, int ifindex) { |
341 | assert_return(lldp, -EINVAL); | |
342 | assert_return(ifindex > 0, -EINVAL); | |
343 | assert_return(lldp->fd < 0, -EBUSY); | |
344 | ||
345 | lldp->ifindex = ifindex; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | _public_ sd_lldp* sd_lldp_ref(sd_lldp *lldp) { | |
350 | ||
351 | if (!lldp) | |
352 | return NULL; | |
353 | ||
354 | assert(lldp->n_ref > 0); | |
355 | lldp->n_ref++; | |
356 | ||
357 | return lldp; | |
358 | } | |
359 | ||
34437b4f | 360 | _public_ sd_lldp* sd_lldp_unref(sd_lldp *lldp) { |
ad1ad5c8 SS |
361 | |
362 | if (!lldp) | |
4afd3348 | 363 | return NULL; |
ad1ad5c8 | 364 | |
fc6a313b LP |
365 | assert(lldp->n_ref > 0); |
366 | lldp->n_ref --; | |
367 | ||
368 | if (lldp->n_ref > 0) | |
369 | return NULL; | |
370 | ||
371 | lldp_reset(lldp); | |
372 | sd_lldp_detach_event(lldp); | |
34437b4f | 373 | lldp_flush_neighbors(lldp); |
ad1ad5c8 | 374 | |
34437b4f LP |
375 | hashmap_free(lldp->neighbor_by_id); |
376 | prioq_free(lldp->neighbor_by_expiry); | |
6b430fdb | 377 | return mfree(lldp); |
ad1ad5c8 SS |
378 | } |
379 | ||
fc6a313b | 380 | _public_ int sd_lldp_new(sd_lldp **ret) { |
4afd3348 | 381 | _cleanup_(sd_lldp_unrefp) sd_lldp *lldp = NULL; |
ad1ad5c8 SS |
382 | int r; |
383 | ||
384 | assert_return(ret, -EINVAL); | |
ad1ad5c8 SS |
385 | |
386 | lldp = new0(sd_lldp, 1); | |
387 | if (!lldp) | |
388 | return -ENOMEM; | |
389 | ||
fc6a313b | 390 | lldp->n_ref = 1; |
032b27f5 | 391 | lldp->fd = -1; |
34437b4f LP |
392 | lldp->neighbors_max = LLDP_DEFAULT_NEIGHBORS_MAX; |
393 | lldp->capability_mask = (uint16_t) -1; | |
ad1ad5c8 | 394 | |
34437b4f LP |
395 | lldp->neighbor_by_id = hashmap_new(&lldp_neighbor_id_hash_ops); |
396 | if (!lldp->neighbor_by_id) | |
ad1ad5c8 SS |
397 | return -ENOMEM; |
398 | ||
34437b4f | 399 | r = prioq_ensure_allocated(&lldp->neighbor_by_expiry, lldp_neighbor_prioq_compare_func); |
ad1ad5c8 SS |
400 | if (r < 0) |
401 | return r; | |
402 | ||
403 | *ret = lldp; | |
404 | lldp = NULL; | |
405 | ||
406 | return 0; | |
407 | } | |
7434883c | 408 | |
34437b4f LP |
409 | static int neighbor_compare_func(const void *a, const void *b) { |
410 | const sd_lldp_neighbor * const*x = a, * const *y = b; | |
7434883c | 411 | |
34437b4f LP |
412 | return lldp_neighbor_id_hash_ops.compare(&(*x)->id, &(*y)->id); |
413 | } | |
414 | ||
34437b4f LP |
415 | static int on_timer_event(sd_event_source *s, uint64_t usec, void *userdata) { |
416 | sd_lldp *lldp = userdata; | |
417 | int r, q; | |
418 | ||
419 | r = lldp_make_space(lldp, 0); | |
420 | if (r < 0) | |
421 | return log_lldp_errno(r, "Failed to make space: %m"); | |
422 | ||
0513ea4e | 423 | q = lldp_start_timer(lldp, NULL); |
34437b4f LP |
424 | if (q < 0) |
425 | return log_lldp_errno(q, "Failed to restart timer: %m"); | |
426 | ||
34437b4f LP |
427 | return 0; |
428 | } | |
7434883c | 429 | |
0513ea4e | 430 | static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor) { |
34437b4f LP |
431 | sd_lldp_neighbor *n; |
432 | int r; | |
433 | ||
434 | assert(lldp); | |
435 | ||
0513ea4e TH |
436 | if (neighbor) |
437 | lldp_neighbor_start_ttl(neighbor); | |
438 | ||
34437b4f LP |
439 | n = prioq_peek(lldp->neighbor_by_expiry); |
440 | if (!n) { | |
441 | ||
442 | if (lldp->timer_event_source) | |
443 | return sd_event_source_set_enabled(lldp->timer_event_source, SD_EVENT_OFF); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | if (lldp->timer_event_source) { | |
449 | r = sd_event_source_set_time(lldp->timer_event_source, n->until); | |
450 | if (r < 0) | |
451 | return r; | |
452 | ||
453 | return sd_event_source_set_enabled(lldp->timer_event_source, SD_EVENT_ONESHOT); | |
7434883c BG |
454 | } |
455 | ||
34437b4f LP |
456 | if (!lldp->event) |
457 | return 0; | |
458 | ||
459 | r = sd_event_add_time(lldp->event, &lldp->timer_event_source, clock_boottime_or_monotonic(), n->until, 0, on_timer_event, lldp); | |
460 | if (r < 0) | |
461 | return r; | |
462 | ||
463 | r = sd_event_source_set_priority(lldp->timer_event_source, lldp->event_priority); | |
464 | if (r < 0) | |
465 | return r; | |
466 | ||
467 | (void) sd_event_source_set_description(lldp->timer_event_source, "lldp-timer"); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | _public_ int sd_lldp_get_neighbors(sd_lldp *lldp, sd_lldp_neighbor ***ret) { | |
472 | sd_lldp_neighbor **l = NULL, *n; | |
473 | Iterator i; | |
474 | int k = 0, r; | |
475 | ||
476 | assert_return(lldp, -EINVAL); | |
477 | assert_return(ret, -EINVAL); | |
478 | ||
34437b4f LP |
479 | if (hashmap_isempty(lldp->neighbor_by_id)) { /* Special shortcut */ |
480 | *ret = NULL; | |
7434883c BG |
481 | return 0; |
482 | } | |
483 | ||
34437b4f LP |
484 | l = new0(sd_lldp_neighbor*, hashmap_size(lldp->neighbor_by_id)); |
485 | if (!l) | |
7434883c BG |
486 | return -ENOMEM; |
487 | ||
0513ea4e | 488 | r = lldp_start_timer(lldp, NULL); |
34437b4f LP |
489 | if (r < 0) { |
490 | free(l); | |
491 | return r; | |
7434883c BG |
492 | } |
493 | ||
34437b4f LP |
494 | HASHMAP_FOREACH(n, lldp->neighbor_by_id, i) |
495 | l[k++] = sd_lldp_neighbor_ref(n); | |
496 | ||
497 | assert((size_t) k == hashmap_size(lldp->neighbor_by_id)); | |
498 | ||
499 | /* Return things in a stable order */ | |
500 | qsort(l, k, sizeof(sd_lldp_neighbor*), neighbor_compare_func); | |
501 | *ret = l; | |
502 | ||
503 | return k; | |
504 | } | |
505 | ||
506 | _public_ int sd_lldp_set_neighbors_max(sd_lldp *lldp, uint64_t m) { | |
507 | assert_return(lldp, -EINVAL); | |
508 | assert_return(m <= 0, -EINVAL); | |
509 | ||
510 | lldp->neighbors_max = m; | |
511 | lldp_make_space(lldp, 0); | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | _public_ int sd_lldp_match_capabilities(sd_lldp *lldp, uint16_t mask) { | |
517 | assert_return(lldp, -EINVAL); | |
518 | assert_return(mask != 0, -EINVAL); | |
519 | ||
520 | lldp->capability_mask = mask; | |
521 | ||
522 | return 0; | |
7434883c | 523 | } |
b553a6b1 LP |
524 | |
525 | _public_ int sd_lldp_set_filter_address(sd_lldp *lldp, const struct ether_addr *addr) { | |
526 | assert_return(lldp, -EINVAL); | |
527 | ||
528 | /* In order to deal nicely with bridges that send back our own packets, allow one address to be filtered, so | |
529 | * that our own can be filtered out here. */ | |
530 | ||
a1fb61b0 LP |
531 | if (addr) |
532 | lldp->filter_address = *addr; | |
533 | else | |
b553a6b1 | 534 | zero(lldp->filter_address); |
b553a6b1 | 535 | |
b553a6b1 LP |
536 | return 0; |
537 | } |