]>
Commit | Line | Data |
---|---|---|
53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
ad1ad5c8 SS |
2 | |
3 | #include <arpa/inet.h> | |
284d1cd0 | 4 | #include <linux/sockios.h> |
ef118d00 | 5 | #include <sys/ioctl.h> |
ad1ad5c8 | 6 | |
ad1ad5c8 | 7 | #include "sd-lldp.h" |
07630cea | 8 | |
b5efdb8a | 9 | #include "alloc-util.h" |
4f0e4d29 | 10 | #include "ether-addr-util.h" |
6ec11d46 | 11 | #include "event-util.h" |
3ffd4af2 | 12 | #include "fd-util.h" |
ad1ad5c8 | 13 | #include "lldp-internal.h" |
34437b4f | 14 | #include "lldp-neighbor.h" |
032b27f5 | 15 | #include "lldp-network.h" |
0a970718 | 16 | #include "memory-util.h" |
34437b4f | 17 | #include "socket-util.h" |
4f0e4d29 | 18 | #include "string-table.h" |
49699bac | 19 | |
34437b4f | 20 | #define LLDP_DEFAULT_NEIGHBORS_MAX 128U |
032b27f5 | 21 | |
4f0e4d29 YW |
22 | static const char * const lldp_event_table[_SD_LLDP_EVENT_MAX] = { |
23 | [SD_LLDP_EVENT_ADDED] = "added", | |
24 | [SD_LLDP_EVENT_REMOVED] = "removed", | |
25 | [SD_LLDP_EVENT_UPDATED] = "updated", | |
26 | [SD_LLDP_EVENT_REFRESHED] = "refreshed", | |
27 | }; | |
28 | ||
29 | DEFINE_STRING_TABLE_LOOKUP(lldp_event, sd_lldp_event); | |
30 | ||
34437b4f | 31 | static void lldp_flush_neighbors(sd_lldp *lldp) { |
ad1ad5c8 | 32 | assert(lldp); |
ad1ad5c8 | 33 | |
8276855e | 34 | hashmap_clear(lldp->neighbor_by_id); |
ad1ad5c8 SS |
35 | } |
36 | ||
90dffb22 LP |
37 | static void lldp_callback(sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n) { |
38 | assert(lldp); | |
4f0e4d29 | 39 | assert(event >= 0 && event < _SD_LLDP_EVENT_MAX); |
90dffb22 | 40 | |
4f0e4d29 YW |
41 | if (!lldp->callback) { |
42 | log_lldp("Received '%s' event.", lldp_event_to_string(event)); | |
90dffb22 | 43 | return; |
4f0e4d29 | 44 | } |
90dffb22 | 45 | |
4f0e4d29 | 46 | log_lldp("Invoking callback for '%s' event.", lldp_event_to_string(event)); |
90dffb22 LP |
47 | lldp->callback(lldp, event, n, lldp->userdata); |
48 | } | |
49 | ||
34437b4f | 50 | static int lldp_make_space(sd_lldp *lldp, size_t extra) { |
34437b4f LP |
51 | usec_t t = USEC_INFINITY; |
52 | bool changed = false; | |
ad1ad5c8 | 53 | |
34437b4f | 54 | assert(lldp); |
ad1ad5c8 | 55 | |
34437b4f LP |
56 | /* Remove all entries that are past their TTL, and more until at least the specified number of extra entries |
57 | * are free. */ | |
ad1ad5c8 | 58 | |
34437b4f | 59 | for (;;) { |
90dffb22 LP |
60 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL; |
61 | ||
34437b4f LP |
62 | n = prioq_peek(lldp->neighbor_by_expiry); |
63 | if (!n) | |
859c37b1 | 64 | break; |
859c37b1 | 65 | |
90dffb22 LP |
66 | sd_lldp_neighbor_ref(n); |
67 | ||
34437b4f LP |
68 | if (hashmap_size(lldp->neighbor_by_id) > LESS_BY(lldp->neighbors_max, extra)) |
69 | goto remove_one; | |
859c37b1 | 70 | |
34437b4f LP |
71 | if (t == USEC_INFINITY) |
72 | t = now(clock_boottime_or_monotonic()); | |
859c37b1 | 73 | |
34437b4f | 74 | if (n->until > t) |
859c37b1 | 75 | break; |
859c37b1 | 76 | |
34437b4f LP |
77 | remove_one: |
78 | lldp_neighbor_unlink(n); | |
90dffb22 | 79 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, n); |
34437b4f LP |
80 | changed = true; |
81 | } | |
859c37b1 | 82 | |
34437b4f LP |
83 | return changed; |
84 | } | |
ad1ad5c8 | 85 | |
90dffb22 LP |
86 | static bool lldp_keep_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) { |
87 | assert(lldp); | |
88 | assert(n); | |
89 | ||
90 | /* Don't keep data with a zero TTL */ | |
91 | if (n->ttl <= 0) | |
92 | return false; | |
93 | ||
94 | /* Filter out data from the filter address */ | |
95 | if (!ether_addr_is_null(&lldp->filter_address) && | |
96 | ether_addr_equal(&lldp->filter_address, &n->source_address)) | |
97 | return false; | |
98 | ||
99 | /* Only add if the neighbor has a capability we are interested in. Note that we also store all neighbors with | |
100 | * no caps field set. */ | |
101 | if (n->has_capabilities && | |
102 | (n->enabled_capabilities & lldp->capability_mask) == 0) | |
103 | return false; | |
104 | ||
105 | /* Keep everything else */ | |
106 | return true; | |
107 | } | |
108 | ||
0513ea4e TH |
109 | static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor); |
110 | ||
34437b4f | 111 | static int lldp_add_neighbor(sd_lldp *lldp, sd_lldp_neighbor *n) { |
90dffb22 LP |
112 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *old = NULL; |
113 | bool keep; | |
34437b4f | 114 | int r; |
ad1ad5c8 | 115 | |
34437b4f LP |
116 | assert(lldp); |
117 | assert(n); | |
118 | assert(!n->lldp); | |
119 | ||
90dffb22 LP |
120 | keep = lldp_keep_neighbor(lldp, n); |
121 | ||
34437b4f LP |
122 | /* First retrieve the old entry for this MSAP */ |
123 | old = hashmap_get(lldp->neighbor_by_id, &n->id); | |
124 | if (old) { | |
90dffb22 LP |
125 | sd_lldp_neighbor_ref(old); |
126 | ||
127 | if (!keep) { | |
128 | lldp_neighbor_unlink(old); | |
129 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old); | |
130 | return 0; | |
131 | } | |
132 | ||
34437b4f | 133 | if (lldp_neighbor_equal(n, old)) { |
f21f31b2 | 134 | /* Is this equal, then restart the TTL counter, but don't do anything else. */ |
16fed825 | 135 | old->timestamp = n->timestamp; |
0513ea4e | 136 | lldp_start_timer(lldp, old); |
90dffb22 | 137 | lldp_callback(lldp, SD_LLDP_EVENT_REFRESHED, old); |
34437b4f | 138 | return 0; |
ad1ad5c8 | 139 | } |
34437b4f LP |
140 | |
141 | /* Data changed, remove the old entry, and add a new one */ | |
142 | lldp_neighbor_unlink(old); | |
ad1ad5c8 | 143 | |
90dffb22 LP |
144 | } else if (!keep) |
145 | return 0; | |
ad1ad5c8 | 146 | |
34437b4f LP |
147 | /* Then, make room for at least one new neighbor */ |
148 | lldp_make_space(lldp, 1); | |
ad1ad5c8 | 149 | |
34437b4f LP |
150 | r = hashmap_put(lldp->neighbor_by_id, &n->id, n); |
151 | if (r < 0) | |
90dffb22 | 152 | goto finish; |
ad1ad5c8 | 153 | |
34437b4f LP |
154 | r = prioq_put(lldp->neighbor_by_expiry, n, &n->prioq_idx); |
155 | if (r < 0) { | |
156 | assert_se(hashmap_remove(lldp->neighbor_by_id, &n->id) == n); | |
90dffb22 | 157 | goto finish; |
ad1ad5c8 SS |
158 | } |
159 | ||
34437b4f | 160 | n->lldp = lldp; |
ad1ad5c8 | 161 | |
0513ea4e | 162 | lldp_start_timer(lldp, n); |
90dffb22 LP |
163 | lldp_callback(lldp, old ? SD_LLDP_EVENT_UPDATED : SD_LLDP_EVENT_ADDED, n); |
164 | ||
165 | return 1; | |
166 | ||
167 | finish: | |
168 | if (old) | |
35ad2cd7 | 169 | lldp_callback(lldp, SD_LLDP_EVENT_REMOVED, old); |
90dffb22 LP |
170 | |
171 | return r; | |
ad1ad5c8 SS |
172 | } |
173 | ||
34437b4f LP |
174 | static int lldp_handle_datagram(sd_lldp *lldp, sd_lldp_neighbor *n) { |
175 | int r; | |
ad1ad5c8 | 176 | |
34437b4f LP |
177 | assert(lldp); |
178 | assert(n); | |
ad1ad5c8 | 179 | |
34437b4f LP |
180 | r = lldp_neighbor_parse(n); |
181 | if (r == -EBADMSG) /* Ignore bad messages */ | |
182 | return 0; | |
183 | if (r < 0) | |
184 | return r; | |
ad1ad5c8 | 185 | |
34437b4f LP |
186 | r = lldp_add_neighbor(lldp, n); |
187 | if (r < 0) { | |
188 | log_lldp_errno(r, "Failed to add datagram. Ignoring."); | |
189 | return 0; | |
ad1ad5c8 | 190 | } |
ad1ad5c8 | 191 | |
34437b4f | 192 | log_lldp("Successfully processed LLDP datagram."); |
34437b4f | 193 | return 0; |
ad1ad5c8 SS |
194 | } |
195 | ||
34437b4f LP |
196 | static int lldp_receive_datagram(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
197 | _cleanup_(sd_lldp_neighbor_unrefp) sd_lldp_neighbor *n = NULL; | |
198 | ssize_t space, length; | |
199 | sd_lldp *lldp = userdata; | |
16fed825 | 200 | struct timespec ts; |
49699bac | 201 | |
34437b4f | 202 | assert(fd >= 0); |
49699bac | 203 | assert(lldp); |
49699bac | 204 | |
34437b4f LP |
205 | space = next_datagram_size_fd(fd); |
206 | if (space < 0) | |
207 | return log_lldp_errno(space, "Failed to determine datagram size to read: %m"); | |
49699bac | 208 | |
34437b4f LP |
209 | n = lldp_neighbor_new(space); |
210 | if (!n) | |
211 | return -ENOMEM; | |
49699bac | 212 | |
34437b4f | 213 | length = recv(fd, LLDP_NEIGHBOR_RAW(n), n->raw_size, MSG_DONTWAIT); |
f3315c58 | 214 | if (length < 0) { |
4c701096 | 215 | if (IN_SET(errno, EAGAIN, EINTR)) |
f3315c58 LP |
216 | return 0; |
217 | ||
34437b4f | 218 | return log_lldp_errno(errno, "Failed to read LLDP datagram: %m"); |
f3315c58 | 219 | } |
dacd6cee | 220 | |
34437b4f LP |
221 | if ((size_t) length != n->raw_size) { |
222 | log_lldp("Packet size mismatch."); | |
223 | return -EINVAL; | |
224 | } | |
49699bac | 225 | |
16fed825 LP |
226 | /* Try to get the timestamp of this packet if it is known */ |
227 | if (ioctl(fd, SIOCGSTAMPNS, &ts) >= 0) | |
228 | triple_timestamp_from_realtime(&n->timestamp, timespec_load(&ts)); | |
229 | else | |
230 | triple_timestamp_get(&n->timestamp); | |
231 | ||
34437b4f | 232 | return lldp_handle_datagram(lldp, n); |
49699bac SS |
233 | } |
234 | ||
fc6a313b LP |
235 | static void lldp_reset(sd_lldp *lldp) { |
236 | assert(lldp); | |
237 | ||
6ec11d46 | 238 | (void) event_source_disable(lldp->timer_event_source); |
fc6a313b LP |
239 | lldp->io_event_source = sd_event_source_unref(lldp->io_event_source); |
240 | lldp->fd = safe_close(lldp->fd); | |
241 | } | |
242 | ||
34437b4f | 243 | _public_ int sd_lldp_start(sd_lldp *lldp) { |
ad1ad5c8 SS |
244 | int r; |
245 | ||
246 | assert_return(lldp, -EINVAL); | |
fc6a313b LP |
247 | assert_return(lldp->event, -EINVAL); |
248 | assert_return(lldp->ifindex > 0, -EINVAL); | |
ad1ad5c8 | 249 | |
032b27f5 LP |
250 | if (lldp->fd >= 0) |
251 | return 0; | |
ad1ad5c8 | 252 | |
34437b4f | 253 | assert(!lldp->io_event_source); |
49699bac | 254 | |
032b27f5 LP |
255 | lldp->fd = lldp_network_bind_raw_socket(lldp->ifindex); |
256 | if (lldp->fd < 0) | |
257 | return lldp->fd; | |
258 | ||
fc6a313b LP |
259 | r = sd_event_add_io(lldp->event, &lldp->io_event_source, lldp->fd, EPOLLIN, lldp_receive_datagram, lldp); |
260 | if (r < 0) | |
261 | goto fail; | |
032b27f5 | 262 | |
fc6a313b LP |
263 | r = sd_event_source_set_priority(lldp->io_event_source, lldp->event_priority); |
264 | if (r < 0) | |
265 | goto fail; | |
032b27f5 | 266 | |
fc6a313b | 267 | (void) sd_event_source_set_description(lldp->io_event_source, "lldp-io"); |
ad1ad5c8 | 268 | |
fc6a313b | 269 | log_lldp("Started LLDP client"); |
032b27f5 LP |
270 | return 1; |
271 | ||
272 | fail: | |
fc6a313b | 273 | lldp_reset(lldp); |
032b27f5 | 274 | return r; |
ad1ad5c8 SS |
275 | } |
276 | ||
34437b4f | 277 | _public_ int sd_lldp_stop(sd_lldp *lldp) { |
ad1ad5c8 | 278 | assert_return(lldp, -EINVAL); |
ad1ad5c8 | 279 | |
032b27f5 LP |
280 | if (lldp->fd < 0) |
281 | return 0; | |
ad1ad5c8 | 282 | |
fc6a313b | 283 | log_lldp("Stopping LLDP client"); |
ad1ad5c8 | 284 | |
fc6a313b | 285 | lldp_reset(lldp); |
34437b4f | 286 | lldp_flush_neighbors(lldp); |
ad1ad5c8 | 287 | |
032b27f5 | 288 | return 1; |
ad1ad5c8 SS |
289 | } |
290 | ||
34437b4f | 291 | _public_ int sd_lldp_attach_event(sd_lldp *lldp, sd_event *event, int64_t priority) { |
ad1ad5c8 SS |
292 | int r; |
293 | ||
294 | assert_return(lldp, -EINVAL); | |
032b27f5 LP |
295 | assert_return(lldp->fd < 0, -EBUSY); |
296 | assert_return(!lldp->event, -EBUSY); | |
ad1ad5c8 SS |
297 | |
298 | if (event) | |
032b27f5 | 299 | lldp->event = sd_event_ref(event); |
ad1ad5c8 | 300 | else { |
032b27f5 | 301 | r = sd_event_default(&lldp->event); |
ad1ad5c8 SS |
302 | if (r < 0) |
303 | return r; | |
304 | } | |
305 | ||
032b27f5 | 306 | lldp->event_priority = priority; |
ad1ad5c8 SS |
307 | |
308 | return 0; | |
309 | } | |
310 | ||
34437b4f | 311 | _public_ int sd_lldp_detach_event(sd_lldp *lldp) { |
ad1ad5c8 SS |
312 | |
313 | assert_return(lldp, -EINVAL); | |
032b27f5 | 314 | assert_return(lldp->fd < 0, -EBUSY); |
ad1ad5c8 | 315 | |
032b27f5 | 316 | lldp->event = sd_event_unref(lldp->event); |
ad1ad5c8 SS |
317 | return 0; |
318 | } | |
319 | ||
3db2ec56 LP |
320 | _public_ sd_event* sd_lldp_get_event(sd_lldp *lldp) { |
321 | assert_return(lldp, NULL); | |
322 | ||
323 | return lldp->event; | |
324 | } | |
325 | ||
34437b4f | 326 | _public_ int sd_lldp_set_callback(sd_lldp *lldp, sd_lldp_callback_t cb, void *userdata) { |
49699bac SS |
327 | assert_return(lldp, -EINVAL); |
328 | ||
ccf86354 | 329 | lldp->callback = cb; |
49699bac SS |
330 | lldp->userdata = userdata; |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
fc6a313b LP |
335 | _public_ int sd_lldp_set_ifindex(sd_lldp *lldp, int ifindex) { |
336 | assert_return(lldp, -EINVAL); | |
337 | assert_return(ifindex > 0, -EINVAL); | |
338 | assert_return(lldp->fd < 0, -EBUSY); | |
339 | ||
340 | lldp->ifindex = ifindex; | |
341 | return 0; | |
342 | } | |
343 | ||
8301aa0b YW |
344 | static sd_lldp* lldp_free(sd_lldp *lldp) { |
345 | assert(lldp); | |
fc6a313b | 346 | |
6ec11d46 YW |
347 | lldp->timer_event_source = sd_event_source_unref(lldp->timer_event_source); |
348 | ||
fc6a313b LP |
349 | lldp_reset(lldp); |
350 | sd_lldp_detach_event(lldp); | |
34437b4f | 351 | lldp_flush_neighbors(lldp); |
ad1ad5c8 | 352 | |
34437b4f LP |
353 | hashmap_free(lldp->neighbor_by_id); |
354 | prioq_free(lldp->neighbor_by_expiry); | |
6b430fdb | 355 | return mfree(lldp); |
ad1ad5c8 SS |
356 | } |
357 | ||
8301aa0b YW |
358 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_lldp, sd_lldp, lldp_free); |
359 | ||
fc6a313b | 360 | _public_ int sd_lldp_new(sd_lldp **ret) { |
4afd3348 | 361 | _cleanup_(sd_lldp_unrefp) sd_lldp *lldp = NULL; |
ad1ad5c8 SS |
362 | int r; |
363 | ||
364 | assert_return(ret, -EINVAL); | |
ad1ad5c8 | 365 | |
8158b90d | 366 | lldp = new(sd_lldp, 1); |
ad1ad5c8 SS |
367 | if (!lldp) |
368 | return -ENOMEM; | |
369 | ||
8158b90d YW |
370 | *lldp = (sd_lldp) { |
371 | .n_ref = 1, | |
372 | .fd = -1, | |
373 | .neighbors_max = LLDP_DEFAULT_NEIGHBORS_MAX, | |
374 | .capability_mask = (uint16_t) -1, | |
375 | }; | |
ad1ad5c8 | 376 | |
8276855e | 377 | lldp->neighbor_by_id = hashmap_new(&lldp_neighbor_hash_ops); |
34437b4f | 378 | if (!lldp->neighbor_by_id) |
ad1ad5c8 SS |
379 | return -ENOMEM; |
380 | ||
34437b4f | 381 | r = prioq_ensure_allocated(&lldp->neighbor_by_expiry, lldp_neighbor_prioq_compare_func); |
ad1ad5c8 SS |
382 | if (r < 0) |
383 | return r; | |
384 | ||
1cc6c93a | 385 | *ret = TAKE_PTR(lldp); |
ad1ad5c8 SS |
386 | |
387 | return 0; | |
388 | } | |
7434883c | 389 | |
93bab288 | 390 | static int neighbor_compare_func(sd_lldp_neighbor * const *a, sd_lldp_neighbor * const *b) { |
dc5f9c6f | 391 | return lldp_neighbor_id_compare_func(&(*a)->id, &(*b)->id); |
34437b4f LP |
392 | } |
393 | ||
34437b4f LP |
394 | static int on_timer_event(sd_event_source *s, uint64_t usec, void *userdata) { |
395 | sd_lldp *lldp = userdata; | |
bb1d9534 | 396 | int r; |
34437b4f LP |
397 | |
398 | r = lldp_make_space(lldp, 0); | |
399 | if (r < 0) | |
400 | return log_lldp_errno(r, "Failed to make space: %m"); | |
401 | ||
bb1d9534 ZJS |
402 | r = lldp_start_timer(lldp, NULL); |
403 | if (r < 0) | |
404 | return log_lldp_errno(r, "Failed to restart timer: %m"); | |
34437b4f | 405 | |
34437b4f LP |
406 | return 0; |
407 | } | |
7434883c | 408 | |
0513ea4e | 409 | static int lldp_start_timer(sd_lldp *lldp, sd_lldp_neighbor *neighbor) { |
34437b4f | 410 | sd_lldp_neighbor *n; |
34437b4f LP |
411 | |
412 | assert(lldp); | |
413 | ||
0513ea4e TH |
414 | if (neighbor) |
415 | lldp_neighbor_start_ttl(neighbor); | |
416 | ||
34437b4f | 417 | n = prioq_peek(lldp->neighbor_by_expiry); |
6ec11d46 YW |
418 | if (!n) |
419 | return event_source_disable(lldp->timer_event_source); | |
7434883c | 420 | |
34437b4f LP |
421 | if (!lldp->event) |
422 | return 0; | |
423 | ||
6ec11d46 YW |
424 | return event_reset_time(lldp->event, &lldp->timer_event_source, |
425 | clock_boottime_or_monotonic(), | |
426 | n->until, 0, | |
427 | on_timer_event, lldp, | |
428 | lldp->event_priority, "lldp-timer", true); | |
34437b4f LP |
429 | } |
430 | ||
431 | _public_ int sd_lldp_get_neighbors(sd_lldp *lldp, sd_lldp_neighbor ***ret) { | |
432 | sd_lldp_neighbor **l = NULL, *n; | |
433 | Iterator i; | |
434 | int k = 0, r; | |
435 | ||
436 | assert_return(lldp, -EINVAL); | |
437 | assert_return(ret, -EINVAL); | |
438 | ||
34437b4f LP |
439 | if (hashmap_isempty(lldp->neighbor_by_id)) { /* Special shortcut */ |
440 | *ret = NULL; | |
7434883c BG |
441 | return 0; |
442 | } | |
443 | ||
34437b4f LP |
444 | l = new0(sd_lldp_neighbor*, hashmap_size(lldp->neighbor_by_id)); |
445 | if (!l) | |
7434883c BG |
446 | return -ENOMEM; |
447 | ||
0513ea4e | 448 | r = lldp_start_timer(lldp, NULL); |
34437b4f LP |
449 | if (r < 0) { |
450 | free(l); | |
451 | return r; | |
7434883c BG |
452 | } |
453 | ||
34437b4f LP |
454 | HASHMAP_FOREACH(n, lldp->neighbor_by_id, i) |
455 | l[k++] = sd_lldp_neighbor_ref(n); | |
456 | ||
457 | assert((size_t) k == hashmap_size(lldp->neighbor_by_id)); | |
458 | ||
459 | /* Return things in a stable order */ | |
93bab288 | 460 | typesafe_qsort(l, k, neighbor_compare_func); |
34437b4f LP |
461 | *ret = l; |
462 | ||
463 | return k; | |
464 | } | |
465 | ||
466 | _public_ int sd_lldp_set_neighbors_max(sd_lldp *lldp, uint64_t m) { | |
467 | assert_return(lldp, -EINVAL); | |
468 | assert_return(m <= 0, -EINVAL); | |
469 | ||
470 | lldp->neighbors_max = m; | |
471 | lldp_make_space(lldp, 0); | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | _public_ int sd_lldp_match_capabilities(sd_lldp *lldp, uint16_t mask) { | |
477 | assert_return(lldp, -EINVAL); | |
478 | assert_return(mask != 0, -EINVAL); | |
479 | ||
480 | lldp->capability_mask = mask; | |
481 | ||
482 | return 0; | |
7434883c | 483 | } |
b553a6b1 LP |
484 | |
485 | _public_ int sd_lldp_set_filter_address(sd_lldp *lldp, const struct ether_addr *addr) { | |
486 | assert_return(lldp, -EINVAL); | |
487 | ||
488 | /* In order to deal nicely with bridges that send back our own packets, allow one address to be filtered, so | |
489 | * that our own can be filtered out here. */ | |
490 | ||
a1fb61b0 LP |
491 | if (addr) |
492 | lldp->filter_address = *addr; | |
493 | else | |
b553a6b1 | 494 | zero(lldp->filter_address); |
b553a6b1 | 495 | |
b553a6b1 LP |
496 | return 0; |
497 | } |