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cd1964ff DS |
1 | /* BGP carrying label information |
2 | * Copyright (C) 2013 Cumulus Networks, Inc. | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
cd1964ff DS |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "command.h" | |
24 | #include "thread.h" | |
25 | #include "prefix.h" | |
26 | #include "zclient.h" | |
27 | #include "stream.h" | |
28 | #include "network.h" | |
29 | #include "log.h" | |
30 | #include "memory.h" | |
31 | #include "nexthop.h" | |
32 | #include "mpls.h" | |
33 | ||
34 | #include "bgpd/bgpd.h" | |
35 | #include "bgpd/bgp_table.h" | |
36 | #include "bgpd/bgp_route.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_label.h" | |
39 | #include "bgpd/bgp_packet.h" | |
40 | #include "bgpd/bgp_debug.h" | |
14454c9f | 41 | #include "bgpd/bgp_errors.h" |
cd1964ff DS |
42 | |
43 | extern struct zclient *zclient; | |
44 | ||
d62a17ae | 45 | int bgp_parse_fec_update(void) |
cd1964ff | 46 | { |
d62a17ae | 47 | struct stream *s; |
9bcb3eef | 48 | struct bgp_dest *dest; |
d62a17ae | 49 | struct bgp *bgp; |
50 | struct bgp_table *table; | |
51 | struct prefix p; | |
d7c0a89a | 52 | uint32_t label; |
d62a17ae | 53 | afi_t afi; |
54 | safi_t safi; | |
55 | ||
56 | s = zclient->ibuf; | |
57 | ||
6006b807 | 58 | memset(&p, 0, sizeof(p)); |
d62a17ae | 59 | p.family = stream_getw(s); |
60 | p.prefixlen = stream_getc(s); | |
a85297a7 | 61 | stream_get(p.u.val, s, PSIZE(p.prefixlen)); |
d62a17ae | 62 | label = stream_getl(s); |
63 | ||
64 | /* hack for the bgp instance & SAFI = have to send/receive it */ | |
65 | afi = family2afi(p.family); | |
66 | safi = SAFI_UNICAST; | |
67 | bgp = bgp_get_default(); | |
68 | if (!bgp) { | |
69 | zlog_debug("no default bgp instance"); | |
70 | return -1; | |
71 | } | |
72 | ||
73 | table = bgp->rib[afi][safi]; | |
74 | if (!table) { | |
75 | zlog_debug("no %u unicast table", p.family); | |
76 | return -1; | |
77 | } | |
9bcb3eef DS |
78 | dest = bgp_node_lookup(table, &p); |
79 | if (!dest) { | |
d62a17ae | 80 | zlog_debug("no node for the prefix"); |
81 | return -1; | |
82 | } | |
83 | ||
84 | /* treat it as implicit withdraw - the label is invalid */ | |
85 | if (label == MPLS_INVALID_LABEL) | |
9bcb3eef | 86 | bgp_unset_valid_label(&dest->local_label); |
d62a17ae | 87 | else { |
67f67ba4 | 88 | dest->local_label = mpls_lse_encode(label, 0, 0, 1); |
9bcb3eef | 89 | bgp_set_valid_label(&dest->local_label); |
d62a17ae | 90 | } |
9bcb3eef | 91 | SET_FLAG(dest->flags, BGP_NODE_LABEL_CHANGED); |
9bcb3eef | 92 | bgp_process(bgp, dest, afi, safi); |
e71ad4b6 | 93 | bgp_dest_unlock_node(dest); |
d62a17ae | 94 | return 1; |
cd1964ff DS |
95 | } |
96 | ||
9bcb3eef | 97 | mpls_label_t bgp_adv_label(struct bgp_dest *dest, struct bgp_path_info *pi, |
d62a17ae | 98 | struct peer *to, afi_t afi, safi_t safi) |
cd1964ff | 99 | { |
d62a17ae | 100 | struct peer *from; |
101 | mpls_label_t remote_label; | |
102 | int reflect; | |
cd1964ff | 103 | |
9bcb3eef | 104 | if (!dest || !pi || !to) |
d62a17ae | 105 | return MPLS_INVALID_LABEL; |
cd1964ff | 106 | |
40381db7 DS |
107 | remote_label = pi->extra ? pi->extra->label[0] : MPLS_INVALID_LABEL; |
108 | from = pi->peer; | |
d62a17ae | 109 | reflect = |
110 | ((from->sort == BGP_PEER_IBGP) && (to->sort == BGP_PEER_IBGP)); | |
cd1964ff | 111 | |
d62a17ae | 112 | if (reflect |
113 | && !CHECK_FLAG(to->af_flags[afi][safi], | |
114 | PEER_FLAG_FORCE_NEXTHOP_SELF)) | |
115 | return remote_label; | |
cd1964ff | 116 | |
d62a17ae | 117 | if (CHECK_FLAG(to->af_flags[afi][safi], PEER_FLAG_NEXTHOP_UNCHANGED)) |
118 | return remote_label; | |
cd1964ff | 119 | |
9bcb3eef | 120 | return dest->local_label; |
cd1964ff DS |
121 | } |
122 | ||
992dd67e PR |
123 | static void bgp_send_fec_register_label_msg(struct bgp_dest *dest, bool reg, |
124 | uint32_t label_index) | |
125 | { | |
126 | struct stream *s; | |
127 | int command; | |
128 | const struct prefix *p; | |
129 | uint16_t flags = 0; | |
130 | size_t flags_pos = 0; | |
131 | mpls_label_t *local_label = &(dest->local_label); | |
67f67ba4 DA |
132 | uint32_t ttl = 0; |
133 | uint32_t bos = 0; | |
134 | uint32_t exp = 0; | |
135 | mpls_label_t label = MPLS_INVALID_LABEL; | |
136 | bool have_label_to_reg; | |
137 | ||
138 | mpls_lse_decode(*local_label, &label, &ttl, &exp, &bos); | |
139 | ||
140 | have_label_to_reg = bgp_is_valid_label(local_label) && | |
141 | label != MPLS_LABEL_IMPLICIT_NULL; | |
992dd67e PR |
142 | |
143 | p = bgp_dest_get_prefix(dest); | |
144 | ||
145 | /* Check socket. */ | |
146 | if (!zclient || zclient->sock < 0) | |
147 | return; | |
148 | ||
149 | if (BGP_DEBUG(labelpool, LABELPOOL)) | |
150 | zlog_debug("%s: FEC %sregister %pRN label_index=%u label=%u", | |
151 | __func__, reg ? "" : "un", bgp_dest_to_rnode(dest), | |
67f67ba4 | 152 | label_index, label); |
992dd67e PR |
153 | /* If the route node has a local_label assigned or the |
154 | * path node has an MPLS SR label index allowing zebra to | |
155 | * derive the label, proceed with registration. */ | |
156 | s = zclient->obuf; | |
157 | stream_reset(s); | |
158 | command = (reg) ? ZEBRA_FEC_REGISTER : ZEBRA_FEC_UNREGISTER; | |
159 | zclient_create_header(s, command, VRF_DEFAULT); | |
160 | flags_pos = stream_get_endp(s); /* save position of 'flags' */ | |
161 | stream_putw(s, flags); /* initial flags */ | |
162 | stream_putw(s, PREFIX_FAMILY(p)); | |
163 | stream_put_prefix(s, p); | |
164 | if (reg) { | |
165 | /* label index takes precedence over auto-assigned label. */ | |
166 | if (label_index != 0) { | |
167 | flags |= ZEBRA_FEC_REGISTER_LABEL_INDEX; | |
168 | stream_putl(s, label_index); | |
169 | } else if (have_label_to_reg) { | |
170 | flags |= ZEBRA_FEC_REGISTER_LABEL; | |
67f67ba4 | 171 | stream_putl(s, label); |
992dd67e PR |
172 | } |
173 | SET_FLAG(dest->flags, BGP_NODE_REGISTERED_FOR_LABEL); | |
174 | } else | |
175 | UNSET_FLAG(dest->flags, BGP_NODE_REGISTERED_FOR_LABEL); | |
176 | ||
177 | /* Set length and flags */ | |
178 | stream_putw_at(s, 0, stream_get_endp(s)); | |
179 | ||
180 | /* | |
181 | * We only need to write new flags if this is a register | |
182 | */ | |
183 | if (reg) | |
184 | stream_putw_at(s, flags_pos, flags); | |
185 | ||
186 | zclient_send_message(zclient); | |
187 | } | |
188 | ||
57592a53 AD |
189 | /** |
190 | * This is passed as the callback function to bgp_labelpool.c:bgp_lp_get() | |
191 | * by bgp_reg_dereg_for_label() when a label needs to be obtained from | |
192 | * label pool. | |
193 | * Note that it will reject the allocated label if a label index is found, | |
194 | * because the label index supposes predictable labels | |
195 | */ | |
196 | int bgp_reg_for_label_callback(mpls_label_t new_label, void *labelid, | |
197 | bool allocated) | |
198 | { | |
9bcb3eef | 199 | struct bgp_dest *dest; |
57592a53 | 200 | |
992dd67e PR |
201 | dest = labelid; |
202 | ||
203 | /* | |
204 | * if the route had been removed or the request has gone then reject | |
205 | * the allocated label. The requesting code will have done what is | |
206 | * required to allocate the correct label | |
207 | */ | |
208 | if (!CHECK_FLAG(dest->flags, BGP_NODE_LABEL_REQUESTED)) { | |
209 | bgp_dest_unlock_node(dest); | |
ea63ff6b EDP |
210 | return -1; |
211 | } | |
212 | ||
992dd67e | 213 | bgp_dest_unlock_node(dest); |
57592a53 AD |
214 | |
215 | if (BGP_DEBUG(labelpool, LABELPOOL)) | |
9bcb3eef DS |
216 | zlog_debug("%s: FEC %pRN label=%u, allocated=%d", __func__, |
217 | bgp_dest_to_rnode(dest), new_label, allocated); | |
57592a53 AD |
218 | |
219 | if (!allocated) { | |
220 | /* | |
992dd67e PR |
221 | * previously-allocated label is now invalid, set to implicit |
222 | * null until new label arrives | |
57592a53 | 223 | */ |
992dd67e PR |
224 | if (CHECK_FLAG(dest->flags, BGP_NODE_REGISTERED_FOR_LABEL)) { |
225 | UNSET_FLAG(dest->flags, BGP_NODE_LABEL_REQUESTED); | |
67f67ba4 DA |
226 | dest->local_label = mpls_lse_encode( |
227 | MPLS_LABEL_IMPLICIT_NULL, 0, 0, 1); | |
9bcb3eef | 228 | bgp_set_valid_label(&dest->local_label); |
57592a53 | 229 | } |
57592a53 AD |
230 | } |
231 | ||
67f67ba4 | 232 | dest->local_label = mpls_lse_encode(new_label, 0, 0, 1); |
9bcb3eef | 233 | bgp_set_valid_label(&dest->local_label); |
57592a53 AD |
234 | |
235 | /* | |
236 | * Get back to registering the FEC | |
237 | */ | |
992dd67e | 238 | bgp_send_fec_register_label_msg(dest, true, 0); |
57592a53 AD |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
9bcb3eef | 243 | void bgp_reg_dereg_for_label(struct bgp_dest *dest, struct bgp_path_info *pi, |
57592a53 | 244 | bool reg) |
cd1964ff | 245 | { |
57592a53 | 246 | bool with_label_index = false; |
b54892e0 | 247 | const struct prefix *p; |
67f67ba4 DA |
248 | bool have_label_to_reg; |
249 | uint32_t ttl = 0; | |
250 | uint32_t bos = 0; | |
251 | uint32_t exp = 0; | |
252 | mpls_label_t label = MPLS_INVALID_LABEL; | |
253 | ||
254 | mpls_lse_decode(dest->local_label, &label, &ttl, &exp, &bos); | |
255 | ||
256 | have_label_to_reg = bgp_is_valid_label(&dest->local_label) && | |
257 | label != MPLS_LABEL_IMPLICIT_NULL; | |
57592a53 | 258 | |
9bcb3eef | 259 | p = bgp_dest_get_prefix(dest); |
57592a53 | 260 | |
bb2ca692 MS |
261 | if (BGP_DEBUG(labelpool, LABELPOOL)) |
262 | zlog_debug("%s: %pFX: %s ", __func__, p, | |
263 | (reg ? "reg" : "dereg")); | |
264 | ||
57592a53 AD |
265 | if (reg) { |
266 | assert(pi); | |
267 | /* | |
268 | * Determine if we will let zebra should derive label from | |
269 | * label index instead of bgpd requesting from label pool | |
270 | */ | |
271 | if (CHECK_FLAG(pi->attr->flag, | |
272 | ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) | |
273 | && pi->attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
274 | with_label_index = true; | |
992dd67e | 275 | UNSET_FLAG(dest->flags, BGP_NODE_LABEL_REQUESTED); |
57592a53 AD |
276 | } else { |
277 | /* | |
992dd67e | 278 | * If no label has been registered -- assume any label |
57592a53 AD |
279 | * from label pool will do. This means that label index |
280 | * always takes precedence over auto-assigned labels. | |
281 | */ | |
282 | if (!have_label_to_reg) { | |
992dd67e | 283 | SET_FLAG(dest->flags, BGP_NODE_LABEL_REQUESTED); |
2dbe669b DA |
284 | if (BGP_DEBUG(labelpool, LABELPOOL)) |
285 | zlog_debug( | |
286 | "%s: Requesting label from LP for %pFX", | |
287 | __func__, p); | |
992dd67e PR |
288 | /* bgp_reg_for_label_callback() will deal with |
289 | * fec registration when it gets a label from | |
290 | * the pool. This means we'll never register | |
291 | * FECs withoutvalid labels. | |
57592a53 | 292 | */ |
992dd67e PR |
293 | bgp_lp_get(LP_TYPE_BGP_LU, dest, |
294 | bgp_reg_for_label_callback); | |
57592a53 AD |
295 | return; |
296 | } | |
297 | } | |
78b351dd | 298 | } else { |
992dd67e | 299 | UNSET_FLAG(dest->flags, BGP_NODE_LABEL_REQUESTED); |
67f67ba4 | 300 | bgp_lp_release(LP_TYPE_BGP_LU, dest, label); |
78b351dd | 301 | } |
d62a17ae | 302 | |
992dd67e PR |
303 | bgp_send_fec_register_label_msg( |
304 | dest, reg, with_label_index ? pi->attr->label_index : 0); | |
cd1964ff DS |
305 | } |
306 | ||
d7c0a89a | 307 | static int bgp_nlri_get_labels(struct peer *peer, uint8_t *pnt, uint8_t plen, |
d62a17ae | 308 | mpls_label_t *label) |
cd1964ff | 309 | { |
d7c0a89a QY |
310 | uint8_t *data = pnt; |
311 | uint8_t *lim = pnt + plen; | |
312 | uint8_t llen = 0; | |
313 | uint8_t label_depth = 0; | |
d62a17ae | 314 | |
315 | for (; data < lim; data += BGP_LABEL_BYTES) { | |
316 | memcpy(label, data, BGP_LABEL_BYTES); | |
317 | llen += BGP_LABEL_BYTES; | |
318 | ||
319 | bgp_set_valid_label(label); | |
320 | label_depth += 1; | |
321 | ||
322 | if (bgp_is_withdraw_label(label) || label_bos(label)) | |
323 | break; | |
324 | } | |
325 | ||
326 | /* If we RX multiple labels we will end up keeping only the last | |
327 | * one. We do not yet support a label stack greater than 1. */ | |
328 | if (label_depth > 1) | |
f70c91dc | 329 | zlog_info("%pBP rcvd UPDATE with label stack %d deep", peer, |
d62a17ae | 330 | label_depth); |
331 | ||
332 | if (!(bgp_is_withdraw_label(label) || label_bos(label))) | |
01c4f23c | 333 | flog_warn( |
e50f7cfd | 334 | EC_BGP_INVALID_LABEL_STACK, |
f70c91dc DA |
335 | "%pBP rcvd UPDATE with invalid label stack - no bottom of stack", |
336 | peer); | |
d62a17ae | 337 | |
338 | return llen; | |
cd1964ff DS |
339 | } |
340 | ||
d62a17ae | 341 | int bgp_nlri_parse_label(struct peer *peer, struct attr *attr, |
342 | struct bgp_nlri *packet) | |
cd1964ff | 343 | { |
d7c0a89a QY |
344 | uint8_t *pnt; |
345 | uint8_t *lim; | |
d62a17ae | 346 | struct prefix p; |
347 | int psize = 0; | |
348 | int prefixlen; | |
349 | afi_t afi; | |
350 | safi_t safi; | |
be92fc9f | 351 | bool addpath_capable; |
d7c0a89a | 352 | uint32_t addpath_id; |
d62a17ae | 353 | mpls_label_t label = MPLS_INVALID_LABEL; |
d7c0a89a | 354 | uint8_t llen; |
d62a17ae | 355 | |
d62a17ae | 356 | pnt = packet->nlri; |
357 | lim = pnt + packet->length; | |
358 | afi = packet->afi; | |
359 | safi = packet->safi; | |
360 | addpath_id = 0; | |
361 | ||
be92fc9f | 362 | addpath_capable = bgp_addpath_encode_rx(peer, afi, safi); |
d62a17ae | 363 | |
364 | for (; pnt < lim; pnt += psize) { | |
365 | /* Clear prefix structure. */ | |
6006b807 | 366 | memset(&p, 0, sizeof(p)); |
d62a17ae | 367 | |
be92fc9f | 368 | if (addpath_capable) { |
d62a17ae | 369 | |
370 | /* When packet overflow occurs return immediately. */ | |
371 | if (pnt + BGP_ADDPATH_ID_LEN > lim) | |
513386b5 | 372 | return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW; |
d62a17ae | 373 | |
a3a850a1 S |
374 | memcpy(&addpath_id, pnt, BGP_ADDPATH_ID_LEN); |
375 | addpath_id = ntohl(addpath_id); | |
d62a17ae | 376 | pnt += BGP_ADDPATH_ID_LEN; |
377 | } | |
378 | ||
379 | /* Fetch prefix length. */ | |
380 | prefixlen = *pnt++; | |
381 | p.family = afi2family(packet->afi); | |
382 | psize = PSIZE(prefixlen); | |
383 | ||
384 | /* sanity check against packet data */ | |
385 | if ((pnt + psize) > lim) { | |
af4c2728 | 386 | flog_err( |
e50f7cfd | 387 | EC_BGP_UPDATE_RCV, |
d62a17ae | 388 | "%s [Error] Update packet error / L-U (prefix length %d exceeds packet size %u)", |
389 | peer->host, prefixlen, (uint)(lim - pnt)); | |
513386b5 | 390 | return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW; |
d62a17ae | 391 | } |
392 | ||
393 | /* Fill in the labels */ | |
394 | llen = bgp_nlri_get_labels(peer, pnt, psize, &label); | |
395 | p.prefixlen = prefixlen - BSIZE(llen); | |
396 | ||
397 | /* There needs to be at least one label */ | |
398 | if (prefixlen < 24) { | |
e50f7cfd | 399 | flog_err(EC_BGP_UPDATE_RCV, |
3efd0893 | 400 | "%s [Error] Update packet error (wrong label length %d)", |
1c50c1c0 | 401 | peer->host, prefixlen); |
d62a17ae | 402 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
403 | BGP_NOTIFY_UPDATE_INVAL_NETWORK); | |
513386b5 | 404 | return BGP_NLRI_PARSE_ERROR_LABEL_LENGTH; |
d62a17ae | 405 | } |
406 | ||
12256b84 | 407 | if ((afi == AFI_IP && p.prefixlen > IPV4_MAX_BITLEN) |
13ccce6e | 408 | || (afi == AFI_IP6 && p.prefixlen > IPV6_MAX_BITLEN)) |
513386b5 | 409 | return BGP_NLRI_PARSE_ERROR_PREFIX_LENGTH; |
d62a17ae | 410 | |
411 | /* Fetch prefix from NLRI packet */ | |
412 | memcpy(&p.u.prefix, pnt + llen, psize - llen); | |
413 | ||
414 | /* Check address. */ | |
415 | if (afi == AFI_IP && safi == SAFI_LABELED_UNICAST) { | |
416 | if (IN_CLASSD(ntohl(p.u.prefix4.s_addr))) { | |
417 | /* From RFC4271 Section 6.3: | |
418 | * | |
419 | * If a prefix in the NLRI field is semantically | |
420 | * incorrect | |
421 | * (e.g., an unexpected multicast IP address), | |
422 | * an error SHOULD | |
423 | * be logged locally, and the prefix SHOULD be | |
424 | * ignored. | |
9d303b37 | 425 | */ |
af4c2728 | 426 | flog_err( |
e50f7cfd | 427 | EC_BGP_UPDATE_RCV, |
23d0a753 DA |
428 | "%s: IPv4 labeled-unicast NLRI is multicast address %pI4, ignoring", |
429 | peer->host, &p.u.prefix4); | |
d62a17ae | 430 | continue; |
431 | } | |
432 | } | |
433 | ||
434 | /* Check address. */ | |
435 | if (afi == AFI_IP6 && safi == SAFI_LABELED_UNICAST) { | |
436 | if (IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6)) { | |
af4c2728 | 437 | flog_err( |
e50f7cfd | 438 | EC_BGP_UPDATE_RCV, |
c0d72166 DS |
439 | "%s: IPv6 labeled-unicast NLRI is link-local address %pI6, ignoring", |
440 | peer->host, &p.u.prefix6); | |
d62a17ae | 441 | |
442 | continue; | |
443 | } | |
444 | ||
445 | if (IN6_IS_ADDR_MULTICAST(&p.u.prefix6)) { | |
af4c2728 | 446 | flog_err( |
e50f7cfd | 447 | EC_BGP_UPDATE_RCV, |
c0d72166 DS |
448 | "%s: IPv6 unicast NLRI is multicast address %pI6, ignoring", |
449 | peer->host, &p.u.prefix6); | |
d62a17ae | 450 | |
451 | continue; | |
452 | } | |
453 | } | |
454 | ||
455 | if (attr) { | |
456 | bgp_update(peer, &p, addpath_id, attr, packet->afi, | |
907707db MS |
457 | safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL, |
458 | NULL, &label, 1, 0, NULL); | |
d62a17ae | 459 | } else { |
460 | bgp_withdraw(peer, &p, addpath_id, attr, packet->afi, | |
461 | SAFI_UNICAST, ZEBRA_ROUTE_BGP, | |
b57ba6d2 | 462 | BGP_ROUTE_NORMAL, NULL, &label, 1, NULL); |
d62a17ae | 463 | } |
464 | } | |
465 | ||
466 | /* Packet length consistency check. */ | |
467 | if (pnt != lim) { | |
af4c2728 | 468 | flog_err( |
e50f7cfd | 469 | EC_BGP_UPDATE_RCV, |
566bdaf6 | 470 | "%s [Error] Update packet error / L-U (%td data remaining after parsing)", |
d62a17ae | 471 | peer->host, lim - pnt); |
513386b5 | 472 | return BGP_NLRI_PARSE_ERROR_PACKET_LENGTH; |
d62a17ae | 473 | } |
474 | ||
513386b5 | 475 | return BGP_NLRI_PARSE_OK; |
cd1964ff | 476 | } |