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3f9c7369 DS |
1 | /** |
2 | * bgp_updgrp_packet.c: BGP update group packet handling routines | |
3 | * | |
4 | * @copyright Copyright (C) 2014 Cumulus Networks, Inc. | |
5 | * | |
6 | * @author Avneesh Sachdev <avneesh@sproute.net> | |
7 | * @author Rajesh Varadarajan <rajesh@sproute.net> | |
8 | * @author Pradosh Mohapatra <pradosh@sproute.net> | |
9 | * | |
10 | * This file is part of GNU Zebra. | |
11 | * | |
12 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2, or (at your option) any | |
15 | * later version. | |
16 | * | |
17 | * GNU Zebra is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | * General Public License for more details. | |
21 | * | |
896014f4 DL |
22 | * You should have received a copy of the GNU General Public License along |
23 | * with this program; see the file COPYING; if not, write to the Free Software | |
24 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
3f9c7369 DS |
25 | */ |
26 | ||
27 | #include <zebra.h> | |
28 | ||
29 | #include "prefix.h" | |
30 | #include "thread.h" | |
31 | #include "buffer.h" | |
32 | #include "stream.h" | |
33 | #include "command.h" | |
34 | #include "sockunion.h" | |
35 | #include "network.h" | |
36 | #include "memory.h" | |
37 | #include "filter.h" | |
38 | #include "routemap.h" | |
3f9c7369 DS |
39 | #include "log.h" |
40 | #include "plist.h" | |
41 | #include "linklist.h" | |
42 | #include "workqueue.h" | |
43 | #include "hash.h" | |
44 | #include "queue.h" | |
cd1964ff | 45 | #include "mpls.h" |
3f9c7369 DS |
46 | |
47 | #include "bgpd/bgpd.h" | |
48 | #include "bgpd/bgp_debug.h" | |
14454c9f | 49 | #include "bgpd/bgp_errors.h" |
3f9c7369 DS |
50 | #include "bgpd/bgp_fsm.h" |
51 | #include "bgpd/bgp_route.h" | |
52 | #include "bgpd/bgp_packet.h" | |
53 | #include "bgpd/bgp_advertise.h" | |
54 | #include "bgpd/bgp_updgrp.h" | |
55 | #include "bgpd/bgp_nexthop.h" | |
56 | #include "bgpd/bgp_nht.h" | |
906ad49b | 57 | #include "bgpd/bgp_mplsvpn.h" |
cd1964ff | 58 | #include "bgpd/bgp_label.h" |
dcc68b5e | 59 | #include "bgpd/bgp_addpath.h" |
3f9c7369 DS |
60 | |
61 | /******************** | |
62 | * PRIVATE FUNCTIONS | |
63 | ********************/ | |
64 | ||
65 | /******************** | |
66 | * PUBLIC FUNCTIONS | |
67 | ********************/ | |
4d762f26 | 68 | struct bpacket *bpacket_alloc(void) |
3f9c7369 | 69 | { |
d62a17ae | 70 | struct bpacket *pkt; |
3f9c7369 | 71 | |
9f5dc319 | 72 | pkt = XCALLOC(MTYPE_BGP_PACKET, sizeof(struct bpacket)); |
3f9c7369 | 73 | |
d62a17ae | 74 | return pkt; |
3f9c7369 DS |
75 | } |
76 | ||
d62a17ae | 77 | void bpacket_free(struct bpacket *pkt) |
3f9c7369 | 78 | { |
d62a17ae | 79 | if (pkt->buffer) |
80 | stream_free(pkt->buffer); | |
81 | pkt->buffer = NULL; | |
82 | XFREE(MTYPE_BGP_PACKET, pkt); | |
3f9c7369 DS |
83 | } |
84 | ||
d62a17ae | 85 | void bpacket_queue_init(struct bpacket_queue *q) |
3f9c7369 | 86 | { |
d62a17ae | 87 | TAILQ_INIT(&(q->pkts)); |
3f9c7369 DS |
88 | } |
89 | ||
90 | /* | |
91 | * bpacket_queue_sanity_check | |
92 | */ | |
d62a17ae | 93 | void bpacket_queue_sanity_check(struct bpacket_queue __attribute__((__unused__)) |
94 | * q) | |
3f9c7369 DS |
95 | { |
96 | #if 0 | |
97 | struct bpacket *pkt; | |
98 | ||
99 | pkt = bpacket_queue_last (q); | |
100 | assert (pkt); | |
101 | assert (!pkt->buffer); | |
102 | ||
103 | /* | |
104 | * Make sure the count of packets is correct. | |
105 | */ | |
106 | int num_pkts = 0; | |
107 | ||
108 | pkt = bpacket_queue_first (q); | |
109 | while (pkt) | |
110 | { | |
111 | num_pkts++; | |
112 | ||
113 | if (num_pkts > q->curr_count) | |
114 | assert (0); | |
115 | ||
116 | pkt = TAILQ_NEXT (pkt, pkt_train); | |
117 | } | |
118 | ||
119 | assert (num_pkts == q->curr_count); | |
120 | #endif | |
121 | } | |
122 | ||
123 | /* | |
124 | * bpacket_queue_add_packet | |
125 | * | |
126 | * Internal function of bpacket_queue - and adds a | |
127 | * packet entry to the end of the list. | |
128 | * | |
129 | * Users of bpacket_queue should use bpacket_queue_add instead. | |
130 | */ | |
d62a17ae | 131 | static void bpacket_queue_add_packet(struct bpacket_queue *q, |
132 | struct bpacket *pkt) | |
3f9c7369 | 133 | { |
d62a17ae | 134 | struct bpacket *last_pkt; |
3f9c7369 | 135 | |
d62a17ae | 136 | if (TAILQ_EMPTY(&(q->pkts))) |
137 | TAILQ_INSERT_TAIL(&(q->pkts), pkt, pkt_train); | |
138 | else { | |
139 | last_pkt = bpacket_queue_last(q); | |
140 | TAILQ_INSERT_AFTER(&(q->pkts), last_pkt, pkt, pkt_train); | |
141 | } | |
142 | q->curr_count++; | |
143 | if (q->hwm_count < q->curr_count) | |
144 | q->hwm_count = q->curr_count; | |
3f9c7369 DS |
145 | } |
146 | ||
147 | /* | |
148 | * Adds a packet to the bpacket_queue. | |
149 | * | |
150 | * The stream passed is consumed by this function. So, the caller should | |
151 | * not free or use the stream after | |
152 | * invoking this function. | |
153 | */ | |
d62a17ae | 154 | struct bpacket *bpacket_queue_add(struct bpacket_queue *q, struct stream *s, |
155 | struct bpacket_attr_vec_arr *vecarrp) | |
3f9c7369 | 156 | { |
d62a17ae | 157 | struct bpacket *pkt; |
158 | struct bpacket *last_pkt; | |
159 | ||
160 | ||
161 | pkt = bpacket_alloc(); | |
162 | if (TAILQ_EMPTY(&(q->pkts))) { | |
163 | pkt->ver = 1; | |
164 | pkt->buffer = s; | |
165 | if (vecarrp) | |
166 | memcpy(&pkt->arr, vecarrp, | |
167 | sizeof(struct bpacket_attr_vec_arr)); | |
168 | else | |
169 | bpacket_attr_vec_arr_reset(&pkt->arr); | |
170 | bpacket_queue_add_packet(q, pkt); | |
171 | bpacket_queue_sanity_check(q); | |
172 | return pkt; | |
173 | } | |
3f9c7369 | 174 | |
d62a17ae | 175 | /* |
176 | * Fill in the new information into the current sentinel and create a | |
177 | * new sentinel. | |
178 | */ | |
179 | bpacket_queue_sanity_check(q); | |
180 | last_pkt = bpacket_queue_last(q); | |
181 | assert(last_pkt->buffer == NULL); | |
182 | last_pkt->buffer = s; | |
183 | if (vecarrp) | |
184 | memcpy(&last_pkt->arr, vecarrp, | |
185 | sizeof(struct bpacket_attr_vec_arr)); | |
186 | else | |
187 | bpacket_attr_vec_arr_reset(&last_pkt->arr); | |
188 | ||
189 | pkt->ver = last_pkt->ver; | |
190 | pkt->ver++; | |
191 | bpacket_queue_add_packet(q, pkt); | |
192 | ||
193 | bpacket_queue_sanity_check(q); | |
194 | return last_pkt; | |
3f9c7369 DS |
195 | } |
196 | ||
d62a17ae | 197 | struct bpacket *bpacket_queue_first(struct bpacket_queue *q) |
3f9c7369 | 198 | { |
d62a17ae | 199 | return (TAILQ_FIRST(&(q->pkts))); |
3f9c7369 DS |
200 | } |
201 | ||
d62a17ae | 202 | struct bpacket *bpacket_queue_last(struct bpacket_queue *q) |
3f9c7369 | 203 | { |
d62a17ae | 204 | return TAILQ_LAST(&(q->pkts), pkt_queue); |
3f9c7369 DS |
205 | } |
206 | ||
d62a17ae | 207 | struct bpacket *bpacket_queue_remove(struct bpacket_queue *q) |
3f9c7369 | 208 | { |
d62a17ae | 209 | struct bpacket *first; |
3f9c7369 | 210 | |
d62a17ae | 211 | first = bpacket_queue_first(q); |
212 | if (first) { | |
213 | TAILQ_REMOVE(&(q->pkts), first, pkt_train); | |
214 | q->curr_count--; | |
215 | } | |
216 | return first; | |
3f9c7369 DS |
217 | } |
218 | ||
d62a17ae | 219 | unsigned int bpacket_queue_length(struct bpacket_queue *q) |
3f9c7369 | 220 | { |
d62a17ae | 221 | return q->curr_count - 1; |
3f9c7369 DS |
222 | } |
223 | ||
d62a17ae | 224 | unsigned int bpacket_queue_hwm_length(struct bpacket_queue *q) |
3f9c7369 | 225 | { |
d62a17ae | 226 | return q->hwm_count - 1; |
3f9c7369 DS |
227 | } |
228 | ||
3dc339cd | 229 | bool bpacket_queue_is_full(struct bgp *bgp, struct bpacket_queue *q) |
3f9c7369 | 230 | { |
d62a17ae | 231 | if (q->curr_count >= bgp->default_subgroup_pkt_queue_max) |
3dc339cd DA |
232 | return true; |
233 | return false; | |
3f9c7369 DS |
234 | } |
235 | ||
d62a17ae | 236 | void bpacket_add_peer(struct bpacket *pkt, struct peer_af *paf) |
3f9c7369 | 237 | { |
d62a17ae | 238 | if (!pkt || !paf) |
239 | return; | |
3f9c7369 | 240 | |
d62a17ae | 241 | LIST_INSERT_HEAD(&(pkt->peers), paf, pkt_train); |
242 | paf->next_pkt_to_send = pkt; | |
3f9c7369 DS |
243 | } |
244 | ||
245 | /* | |
246 | * bpacket_queue_cleanup | |
247 | */ | |
d62a17ae | 248 | void bpacket_queue_cleanup(struct bpacket_queue *q) |
3f9c7369 | 249 | { |
d62a17ae | 250 | struct bpacket *pkt; |
3f9c7369 | 251 | |
d62a17ae | 252 | while ((pkt = bpacket_queue_remove(q))) { |
253 | bpacket_free(pkt); | |
254 | } | |
3f9c7369 DS |
255 | } |
256 | ||
257 | /* | |
258 | * bpacket_queue_compact | |
259 | * | |
260 | * Delete packets that do not need to be transmitted to any peer from | |
261 | * the queue. | |
262 | * | |
263 | * @return the number of packets deleted. | |
264 | */ | |
d62a17ae | 265 | static int bpacket_queue_compact(struct bpacket_queue *q) |
3f9c7369 | 266 | { |
d62a17ae | 267 | int num_deleted; |
268 | struct bpacket *pkt, *removed_pkt; | |
3f9c7369 | 269 | |
d62a17ae | 270 | num_deleted = 0; |
3f9c7369 | 271 | |
d62a17ae | 272 | while (1) { |
273 | pkt = bpacket_queue_first(q); | |
274 | if (!pkt) | |
275 | break; | |
3f9c7369 | 276 | |
d62a17ae | 277 | /* |
278 | * Don't delete the sentinel. | |
279 | */ | |
280 | if (!pkt->buffer) | |
281 | break; | |
3f9c7369 | 282 | |
d62a17ae | 283 | if (!LIST_EMPTY(&(pkt->peers))) |
284 | break; | |
3f9c7369 | 285 | |
d62a17ae | 286 | removed_pkt = bpacket_queue_remove(q); |
287 | assert(pkt == removed_pkt); | |
288 | bpacket_free(removed_pkt); | |
3f9c7369 | 289 | |
d62a17ae | 290 | num_deleted++; |
291 | } | |
3f9c7369 | 292 | |
d62a17ae | 293 | bpacket_queue_sanity_check(q); |
294 | return num_deleted; | |
3f9c7369 DS |
295 | } |
296 | ||
d62a17ae | 297 | void bpacket_queue_advance_peer(struct peer_af *paf) |
3f9c7369 | 298 | { |
d62a17ae | 299 | struct bpacket *pkt; |
300 | struct bpacket *old_pkt; | |
301 | ||
302 | old_pkt = paf->next_pkt_to_send; | |
303 | if (old_pkt->buffer == NULL) | |
304 | /* Already at end of list */ | |
305 | return; | |
306 | ||
307 | LIST_REMOVE(paf, pkt_train); | |
308 | pkt = TAILQ_NEXT(old_pkt, pkt_train); | |
309 | bpacket_add_peer(pkt, paf); | |
310 | ||
311 | if (!bpacket_queue_compact(PAF_PKTQ(paf))) | |
312 | return; | |
313 | ||
314 | /* | |
315 | * Deleted one or more packets. Check if we can now merge this | |
316 | * peer's subgroup into another subgroup. | |
317 | */ | |
318 | update_subgroup_check_merge(paf->subgroup, "advanced peer in queue"); | |
3f9c7369 DS |
319 | } |
320 | ||
321 | /* | |
322 | * bpacket_queue_remove_peer | |
323 | * | |
324 | * Remove the peer from the packet queue of the subgroup it belongs | |
325 | * to. | |
326 | */ | |
d62a17ae | 327 | void bpacket_queue_remove_peer(struct peer_af *paf) |
3f9c7369 | 328 | { |
d62a17ae | 329 | struct bpacket_queue *q; |
3f9c7369 | 330 | |
d62a17ae | 331 | q = PAF_PKTQ(paf); |
332 | assert(q); | |
3f9c7369 | 333 | |
d62a17ae | 334 | LIST_REMOVE(paf, pkt_train); |
335 | paf->next_pkt_to_send = NULL; | |
3f9c7369 | 336 | |
d62a17ae | 337 | bpacket_queue_compact(q); |
3f9c7369 DS |
338 | } |
339 | ||
d62a17ae | 340 | unsigned int bpacket_queue_virtual_length(struct peer_af *paf) |
3f9c7369 | 341 | { |
d62a17ae | 342 | struct bpacket *pkt; |
343 | struct bpacket *last; | |
344 | struct bpacket_queue *q; | |
3f9c7369 | 345 | |
d62a17ae | 346 | pkt = paf->next_pkt_to_send; |
347 | if (!pkt || (pkt->buffer == NULL)) | |
348 | /* Already at end of list */ | |
349 | return 0; | |
3f9c7369 | 350 | |
d62a17ae | 351 | q = PAF_PKTQ(paf); |
352 | if (TAILQ_EMPTY(&(q->pkts))) | |
353 | return 0; | |
3f9c7369 | 354 | |
d62a17ae | 355 | last = TAILQ_LAST(&(q->pkts), pkt_queue); |
356 | if (last->ver >= pkt->ver) | |
357 | return last->ver - pkt->ver; | |
3f9c7369 | 358 | |
d62a17ae | 359 | /* sequence # rolled over */ |
360 | return (UINT_MAX - pkt->ver + 1) + last->ver; | |
3f9c7369 DS |
361 | } |
362 | ||
363 | /* | |
364 | * Dump the bpacket queue | |
365 | */ | |
d62a17ae | 366 | void bpacket_queue_show_vty(struct bpacket_queue *q, struct vty *vty) |
3f9c7369 | 367 | { |
d62a17ae | 368 | struct bpacket *pkt; |
369 | struct peer_af *paf; | |
370 | ||
371 | pkt = bpacket_queue_first(q); | |
372 | while (pkt) { | |
373 | vty_out(vty, " Packet %p ver %u buffer %p\n", pkt, pkt->ver, | |
374 | pkt->buffer); | |
375 | ||
a2addae8 | 376 | LIST_FOREACH (paf, &(pkt->peers), pkt_train) { |
d62a17ae | 377 | vty_out(vty, " - %s\n", paf->peer->host); |
378 | } | |
379 | pkt = bpacket_next(pkt); | |
380 | } | |
381 | return; | |
3f9c7369 DS |
382 | } |
383 | ||
d62a17ae | 384 | struct stream *bpacket_reformat_for_peer(struct bpacket *pkt, |
385 | struct peer_af *paf) | |
3f9c7369 | 386 | { |
d62a17ae | 387 | struct stream *s = NULL; |
388 | bpacket_attr_vec *vec; | |
389 | struct peer *peer; | |
390 | char buf[BUFSIZ]; | |
391 | char buf2[BUFSIZ]; | |
1c875ddb | 392 | struct bgp_filter *filter; |
d62a17ae | 393 | |
394 | s = stream_dup(pkt->buffer); | |
395 | peer = PAF_PEER(paf); | |
396 | ||
397 | vec = &pkt->arr.entries[BGP_ATTR_VEC_NH]; | |
d62a17ae | 398 | |
f041034e DS |
399 | if (!CHECK_FLAG(vec->flags, BPKT_ATTRVEC_FLAGS_UPDATED)) |
400 | return s; | |
401 | ||
402 | uint8_t nhlen; | |
403 | afi_t nhafi; | |
404 | int route_map_sets_nh; | |
405 | ||
406 | nhlen = stream_getc_from(s, vec->offset); | |
407 | filter = &peer->filter[paf->afi][paf->safi]; | |
408 | ||
409 | if (peer_cap_enhe(peer, paf->afi, paf->safi)) | |
410 | nhafi = AFI_IP6; | |
411 | else | |
412 | nhafi = BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen); | |
413 | ||
414 | if (nhafi == AFI_IP) { | |
415 | struct in_addr v4nh, *mod_v4nh; | |
416 | int nh_modified = 0; | |
417 | size_t offset_nh = vec->offset + 1; | |
418 | ||
419 | route_map_sets_nh = | |
420 | (CHECK_FLAG(vec->flags, | |
421 | BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED) | |
422 | || CHECK_FLAG( | |
423 | vec->flags, | |
424 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)); | |
425 | ||
426 | switch (nhlen) { | |
427 | case BGP_ATTR_NHLEN_IPV4: | |
428 | break; | |
429 | case BGP_ATTR_NHLEN_VPNV4: | |
430 | offset_nh += 8; | |
431 | break; | |
432 | default: | |
433 | /* TODO: handle IPv6 nexthops */ | |
434 | flog_warn( | |
435 | EC_BGP_INVALID_NEXTHOP_LENGTH, | |
436 | "%s: %s: invalid MP nexthop length (AFI IP): %u", | |
437 | __func__, peer->host, nhlen); | |
438 | stream_free(s); | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | stream_get_from(&v4nh, s, offset_nh, IPV4_MAX_BYTELEN); | |
443 | mod_v4nh = &v4nh; | |
444 | ||
445 | /* | |
446 | * If route-map has set the nexthop, that is normally | |
447 | * used; if it is specified as peer-address, the peering | |
448 | * address is picked up. Otherwise, if NH is unavailable | |
449 | * from attribute, the peering addr is picked up; the | |
450 | * "NH unavailable" case also covers next-hop-self and | |
451 | * some other scenarios - see subgroup_announce_check(). | |
452 | * In all other cases, use the nexthop carried in the | |
453 | * attribute unless it is EBGP non-multiaccess and there | |
454 | * is no next-hop-unchanged setting or the peer is EBGP | |
455 | * and the route-map that changed the next-hop value | |
456 | * was applied inbound rather than outbound. Updates to | |
457 | * an EBGP peer should only modify the next-hop if it | |
458 | * was set in an outbound route-map to that peer. | |
459 | * Note: It is assumed route-map cannot set the nexthop | |
460 | * to an invalid value. | |
461 | */ | |
462 | if (route_map_sets_nh | |
463 | && ((peer->sort != BGP_PEER_EBGP) | |
464 | || ROUTE_MAP_OUT(filter))) { | |
465 | if (CHECK_FLAG( | |
466 | vec->flags, | |
467 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) { | |
d62a17ae | 468 | mod_v4nh = &peer->nexthop.v4; |
469 | nh_modified = 1; | |
470 | } | |
f041034e DS |
471 | } else if (v4nh.s_addr == INADDR_ANY) { |
472 | mod_v4nh = &peer->nexthop.v4; | |
473 | nh_modified = 1; | |
474 | } else if (peer->sort == BGP_PEER_EBGP | |
475 | && (bgp_multiaccess_check_v4(v4nh, peer) == 0) | |
476 | && !CHECK_FLAG(vec->flags, | |
477 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED) | |
478 | && !peer_af_flag_check( | |
479 | peer, paf->afi, paf->safi, | |
480 | PEER_FLAG_NEXTHOP_UNCHANGED)) { | |
481 | /* NOTE: not handling case where NH has new AFI | |
482 | */ | |
483 | mod_v4nh = &peer->nexthop.v4; | |
484 | nh_modified = 1; | |
485 | } | |
d62a17ae | 486 | |
f041034e DS |
487 | if (nh_modified) /* allow for VPN RD */ |
488 | stream_put_in_addr_at(s, offset_nh, mod_v4nh); | |
489 | ||
490 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
23d0a753 DA |
491 | zlog_debug("u%" PRIu64 ":s%" PRIu64 |
492 | " %s send UPDATE w/ nexthop %pI4%s", | |
f041034e | 493 | PAF_SUBGRP(paf)->update_group->id, |
23d0a753 | 494 | PAF_SUBGRP(paf)->id, peer->host, mod_v4nh, |
3ddd6994 DA |
495 | (nhlen == BGP_ATTR_NHLEN_VPNV4 ? " and RD" |
496 | : "")); | |
f041034e DS |
497 | } else if (nhafi == AFI_IP6) { |
498 | struct in6_addr v6nhglobal, *mod_v6nhg; | |
499 | struct in6_addr v6nhlocal, *mod_v6nhl; | |
500 | int gnh_modified, lnh_modified; | |
501 | size_t offset_nhglobal = vec->offset + 1; | |
502 | size_t offset_nhlocal = vec->offset + 1; | |
503 | ||
504 | gnh_modified = lnh_modified = 0; | |
505 | mod_v6nhg = &v6nhglobal; | |
506 | mod_v6nhl = &v6nhlocal; | |
507 | ||
508 | route_map_sets_nh = | |
509 | (CHECK_FLAG(vec->flags, | |
510 | BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED) | |
511 | || CHECK_FLAG( | |
512 | vec->flags, | |
513 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)); | |
d62a17ae | 514 | |
f041034e DS |
515 | /* |
516 | * The logic here is rather similar to that for IPv4, the | |
517 | * additional work being to handle 1 or 2 nexthops. | |
518 | * Also, 3rd party nexthop is not propagated for EBGP | |
519 | * right now. | |
520 | */ | |
521 | switch (nhlen) { | |
522 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: | |
523 | break; | |
524 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
525 | offset_nhlocal += IPV6_MAX_BYTELEN; | |
526 | break; | |
527 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
528 | offset_nhglobal += 8; | |
529 | break; | |
530 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
531 | offset_nhglobal += 8; | |
532 | offset_nhlocal += 8 * 2 + IPV6_MAX_BYTELEN; | |
533 | break; | |
534 | default: | |
535 | /* TODO: handle IPv4 nexthops */ | |
536 | flog_warn( | |
537 | EC_BGP_INVALID_NEXTHOP_LENGTH, | |
538 | "%s: %s: invalid MP nexthop length (AFI IP6): %u", | |
539 | __func__, peer->host, nhlen); | |
540 | stream_free(s); | |
541 | return NULL; | |
542 | } | |
d62a17ae | 543 | |
f041034e DS |
544 | stream_get_from(&v6nhglobal, s, offset_nhglobal, |
545 | IPV6_MAX_BYTELEN); | |
1c875ddb | 546 | |
f041034e DS |
547 | /* |
548 | * Updates to an EBGP peer should only modify the | |
549 | * next-hop if it was set in an outbound route-map | |
550 | * to that peer. | |
551 | */ | |
552 | if (route_map_sets_nh | |
553 | && ((peer->sort != BGP_PEER_EBGP) | |
554 | || ROUTE_MAP_OUT(filter))) { | |
555 | if (CHECK_FLAG( | |
556 | vec->flags, | |
557 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) { | |
d62a17ae | 558 | mod_v6nhg = &peer->nexthop.v6_global; |
559 | gnh_modified = 1; | |
560 | } | |
f041034e DS |
561 | } else if (IN6_IS_ADDR_UNSPECIFIED(&v6nhglobal)) { |
562 | mod_v6nhg = &peer->nexthop.v6_global; | |
563 | gnh_modified = 1; | |
564 | } else if ((peer->sort == BGP_PEER_EBGP) | |
565 | && (!bgp_multiaccess_check_v6(v6nhglobal, peer)) | |
566 | && !CHECK_FLAG(vec->flags, | |
567 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED) | |
568 | && !peer_af_flag_check( | |
569 | peer, nhafi, paf->safi, | |
570 | PEER_FLAG_NEXTHOP_UNCHANGED)) { | |
571 | /* NOTE: not handling case where NH has new AFI | |
572 | */ | |
573 | mod_v6nhg = &peer->nexthop.v6_global; | |
574 | gnh_modified = 1; | |
575 | } | |
d62a17ae | 576 | |
92d6f769 | 577 | if (IN6_IS_ADDR_UNSPECIFIED(mod_v6nhg)) { |
3a6290bd | 578 | if (peer->nexthop.v4.s_addr != INADDR_ANY) { |
92d6f769 K |
579 | ipv4_to_ipv4_mapped_ipv6(mod_v6nhg, |
580 | peer->nexthop.v4); | |
581 | } | |
582 | } | |
583 | ||
584 | if (IS_MAPPED_IPV6(&peer->nexthop.v6_global)) { | |
585 | mod_v6nhg = &peer->nexthop.v6_global; | |
586 | gnh_modified = 1; | |
587 | } | |
588 | ||
f041034e DS |
589 | if (nhlen == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL |
590 | || nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
591 | stream_get_from(&v6nhlocal, s, offset_nhlocal, | |
592 | IPV6_MAX_BYTELEN); | |
593 | if (IN6_IS_ADDR_UNSPECIFIED(&v6nhlocal)) { | |
594 | mod_v6nhl = &peer->nexthop.v6_local; | |
595 | lnh_modified = 1; | |
d62a17ae | 596 | } |
f041034e | 597 | } |
d62a17ae | 598 | |
f041034e DS |
599 | if (gnh_modified) |
600 | stream_put_in6_addr_at(s, offset_nhglobal, mod_v6nhg); | |
601 | if (lnh_modified) | |
602 | stream_put_in6_addr_at(s, offset_nhlocal, mod_v6nhl); | |
603 | ||
604 | if (bgp_debug_update(peer, NULL, NULL, 0)) { | |
3ddd6994 DA |
605 | if (nhlen == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL |
606 | || nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
f041034e | 607 | zlog_debug( |
6cde4b45 | 608 | "u%" PRIu64 ":s%" PRIu64" %s send UPDATE w/ mp_nexthops %s, %s%s", |
f041034e DS |
609 | PAF_SUBGRP(paf)->update_group->id, |
610 | PAF_SUBGRP(paf)->id, peer->host, | |
611 | inet_ntop(AF_INET6, mod_v6nhg, buf, | |
612 | BUFSIZ), | |
613 | inet_ntop(AF_INET6, mod_v6nhl, buf2, | |
614 | BUFSIZ), | |
3ddd6994 DA |
615 | (nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL |
616 | ? " and RD" | |
617 | : "")); | |
f041034e | 618 | else |
6cde4b45 | 619 | zlog_debug("u%" PRIu64 ":s%" PRIu64" %s send UPDATE w/ mp_nexthop %s%s", |
d62a17ae | 620 | PAF_SUBGRP(paf)->update_group->id, |
621 | PAF_SUBGRP(paf)->id, peer->host, | |
f041034e DS |
622 | inet_ntop(AF_INET6, mod_v6nhg, buf, |
623 | BUFSIZ), | |
3ddd6994 DA |
624 | (nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL |
625 | ? " and RD" | |
626 | : "")); | |
f041034e DS |
627 | } |
628 | } else if (paf->afi == AFI_L2VPN) { | |
629 | struct in_addr v4nh, *mod_v4nh; | |
630 | int nh_modified = 0; | |
631 | ||
632 | stream_get_from(&v4nh, s, vec->offset + 1, 4); | |
633 | mod_v4nh = &v4nh; | |
634 | ||
635 | /* No route-map changes allowed for EVPN nexthops. */ | |
636 | if (v4nh.s_addr == INADDR_ANY) { | |
637 | mod_v4nh = &peer->nexthop.v4; | |
638 | nh_modified = 1; | |
d62a17ae | 639 | } |
f041034e DS |
640 | |
641 | if (nh_modified) | |
642 | stream_put_in_addr_at(s, vec->offset + 1, mod_v4nh); | |
643 | ||
644 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
23d0a753 DA |
645 | zlog_debug("u%" PRIu64 ":s%" PRIu64 |
646 | " %s send UPDATE w/ nexthop %pI4", | |
f041034e | 647 | PAF_SUBGRP(paf)->update_group->id, |
23d0a753 | 648 | PAF_SUBGRP(paf)->id, peer->host, mod_v4nh); |
3f9c7369 | 649 | } |
3f9c7369 | 650 | |
d62a17ae | 651 | return s; |
3f9c7369 DS |
652 | } |
653 | ||
654 | /* | |
655 | * Update the vecarr offsets to go beyond 'pos' bytes, i.e. add 'pos' | |
656 | * to each offset. | |
657 | */ | |
d62a17ae | 658 | static void bpacket_attr_vec_arr_update(struct bpacket_attr_vec_arr *vecarr, |
659 | size_t pos) | |
3f9c7369 | 660 | { |
d62a17ae | 661 | int i; |
3f9c7369 | 662 | |
d62a17ae | 663 | if (!vecarr) |
664 | return; | |
3f9c7369 | 665 | |
d62a17ae | 666 | for (i = 0; i < BGP_ATTR_VEC_MAX; i++) |
667 | vecarr->entries[i].offset += pos; | |
3f9c7369 DS |
668 | } |
669 | ||
670 | /* | |
671 | * Return if there are packets to build for this subgroup. | |
672 | */ | |
3dc339cd | 673 | bool subgroup_packets_to_build(struct update_subgroup *subgrp) |
3f9c7369 | 674 | { |
d62a17ae | 675 | struct bgp_advertise *adv; |
3f9c7369 | 676 | |
d62a17ae | 677 | if (!subgrp) |
3dc339cd | 678 | return false; |
3f9c7369 | 679 | |
a274fef8 | 680 | adv = bgp_adv_fifo_first(&subgrp->sync->withdraw); |
d62a17ae | 681 | if (adv) |
3dc339cd | 682 | return true; |
3f9c7369 | 683 | |
a274fef8 | 684 | adv = bgp_adv_fifo_first(&subgrp->sync->update); |
d62a17ae | 685 | if (adv) |
3dc339cd | 686 | return true; |
3f9c7369 | 687 | |
3dc339cd | 688 | return false; |
3f9c7369 DS |
689 | } |
690 | ||
691 | /* Make BGP update packet. */ | |
d62a17ae | 692 | struct bpacket *subgroup_update_packet(struct update_subgroup *subgrp) |
3f9c7369 | 693 | { |
d62a17ae | 694 | struct bpacket_attr_vec_arr vecarr; |
695 | struct bpacket *pkt; | |
696 | struct peer *peer; | |
697 | struct stream *s; | |
698 | struct stream *snlri; | |
699 | struct stream *packet; | |
700 | struct bgp_adj_out *adj; | |
701 | struct bgp_advertise *adv; | |
9bcb3eef | 702 | struct bgp_dest *dest = NULL; |
9b6d8fcf | 703 | struct bgp_path_info *path = NULL; |
d62a17ae | 704 | bgp_size_t total_attr_len = 0; |
705 | unsigned long attrlen_pos = 0; | |
706 | size_t mpattrlen_pos = 0; | |
707 | size_t mpattr_pos = 0; | |
708 | afi_t afi; | |
709 | safi_t safi; | |
710 | int space_remaining = 0; | |
711 | int space_needed = 0; | |
712 | char send_attr_str[BUFSIZ]; | |
713 | int send_attr_printed = 0; | |
714 | int num_pfx = 0; | |
715 | int addpath_encode = 0; | |
e386c1d5 | 716 | int addpath_overhead = 0; |
d7c0a89a | 717 | uint32_t addpath_tx_id = 0; |
d62a17ae | 718 | struct prefix_rd *prd = NULL; |
b57ba6d2 | 719 | mpls_label_t label = MPLS_INVALID_LABEL, *label_pnt = NULL; |
d7c0a89a | 720 | uint32_t num_labels = 0; |
d62a17ae | 721 | |
722 | if (!subgrp) | |
723 | return NULL; | |
3f9c7369 | 724 | |
d62a17ae | 725 | if (bpacket_queue_is_full(SUBGRP_INST(subgrp), SUBGRP_PKTQ(subgrp))) |
726 | return NULL; | |
3f9c7369 | 727 | |
d62a17ae | 728 | peer = SUBGRP_PEER(subgrp); |
729 | afi = SUBGRP_AFI(subgrp); | |
730 | safi = SUBGRP_SAFI(subgrp); | |
731 | s = subgrp->work; | |
732 | stream_reset(s); | |
733 | snlri = subgrp->scratch; | |
734 | stream_reset(snlri); | |
735 | ||
736 | bpacket_attr_vec_arr_reset(&vecarr); | |
737 | ||
738 | addpath_encode = bgp_addpath_encode_tx(peer, afi, safi); | |
e386c1d5 | 739 | addpath_overhead = addpath_encode ? BGP_ADDPATH_ID_LEN : 0; |
d62a17ae | 740 | |
a274fef8 | 741 | adv = bgp_adv_fifo_first(&subgrp->sync->update); |
d62a17ae | 742 | while (adv) { |
9bcb3eef | 743 | const struct prefix *dest_p; |
b54892e0 | 744 | |
9bcb3eef DS |
745 | assert(adv->dest); |
746 | dest = adv->dest; | |
747 | dest_p = bgp_dest_get_prefix(dest); | |
d62a17ae | 748 | adj = adv->adj; |
749 | addpath_tx_id = adj->addpath_tx_id; | |
9b6d8fcf | 750 | path = adv->pathi; |
d62a17ae | 751 | |
fde246e8 DA |
752 | /* Check if we need to add a prefix to the packet if |
753 | * maximum-prefix-out is set for the peer. | |
754 | */ | |
755 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
756 | PEER_FLAG_MAX_PREFIX_OUT) | |
757 | && subgrp->scount >= peer->pmax_out[afi][safi]) { | |
758 | if (BGP_DEBUG(update, UPDATE_OUT) | |
759 | || BGP_DEBUG(update, UPDATE_PREFIX)) { | |
760 | zlog_debug( | |
6cde4b45 | 761 | "%s reached maximum prefix to be send (%u)", |
fde246e8 DA |
762 | peer->host, peer->pmax_out[afi][safi]); |
763 | } | |
764 | goto next; | |
765 | } | |
766 | ||
d62a17ae | 767 | space_remaining = STREAM_CONCAT_REMAIN(s, snlri, STREAM_SIZE(s)) |
768 | - BGP_MAX_PACKET_SIZE_OVERFLOW; | |
9bcb3eef DS |
769 | space_needed = |
770 | BGP_NLRI_LENGTH + addpath_overhead | |
771 | + bgp_packet_mpattr_prefix_size(afi, safi, dest_p); | |
d62a17ae | 772 | |
773 | /* When remaining space can't include NLRI and it's length. */ | |
774 | if (space_remaining < space_needed) | |
775 | break; | |
776 | ||
777 | /* If packet is empty, set attribute. */ | |
778 | if (stream_empty(s)) { | |
779 | struct peer *from = NULL; | |
780 | ||
9b6d8fcf DS |
781 | if (path) |
782 | from = path->peer; | |
d62a17ae | 783 | |
784 | /* 1: Write the BGP message header - 16 bytes marker, 2 | |
785 | * bytes length, | |
786 | * one byte message type. | |
787 | */ | |
788 | bgp_packet_set_marker(s, BGP_MSG_UPDATE); | |
789 | ||
790 | /* 2: withdrawn routes length */ | |
791 | stream_putw(s, 0); | |
792 | ||
793 | /* 3: total attributes length - attrlen_pos stores the | |
794 | * position */ | |
795 | attrlen_pos = stream_get_endp(s); | |
796 | stream_putw(s, 0); | |
797 | ||
798 | /* 4: if there is MP_REACH_NLRI attribute, that should | |
799 | * be the first | |
800 | * attribute, according to | |
801 | * draft-ietf-idr-error-handling. Save the | |
802 | * position. | |
803 | */ | |
804 | mpattr_pos = stream_get_endp(s); | |
805 | ||
806 | /* 5: Encode all the attributes, except MP_REACH_NLRI | |
807 | * attr. */ | |
808 | total_attr_len = bgp_packet_attribute( | |
809 | NULL, peer, s, adv->baa->attr, &vecarr, NULL, | |
b57ba6d2 | 810 | afi, safi, from, NULL, NULL, 0, 0, 0); |
d62a17ae | 811 | |
812 | space_remaining = | |
813 | STREAM_CONCAT_REMAIN(s, snlri, STREAM_SIZE(s)) | |
814 | - BGP_MAX_PACKET_SIZE_OVERFLOW; | |
996c9314 LB |
815 | space_needed = BGP_NLRI_LENGTH + addpath_overhead |
816 | + bgp_packet_mpattr_prefix_size( | |
9bcb3eef | 817 | afi, safi, dest_p); |
d62a17ae | 818 | |
819 | /* If the attributes alone do not leave any room for | |
820 | * NLRI then | |
821 | * return */ | |
822 | if (space_remaining < space_needed) { | |
af4c2728 | 823 | flog_err( |
e50f7cfd | 824 | EC_BGP_UPDGRP_ATTR_LEN, |
6cde4b45 | 825 | "u%" PRIu64 ":s%" PRIu64" attributes too long, cannot send UPDATE", |
d62a17ae | 826 | subgrp->update_group->id, subgrp->id); |
827 | ||
828 | /* Flush the FIFO update queue */ | |
829 | while (adv) | |
830 | adv = bgp_advertise_clean_subgroup( | |
831 | subgrp, adj); | |
832 | return NULL; | |
833 | } | |
834 | ||
835 | if (BGP_DEBUG(update, UPDATE_OUT) | |
836 | || BGP_DEBUG(update, UPDATE_PREFIX)) { | |
837 | memset(send_attr_str, 0, BUFSIZ); | |
838 | send_attr_printed = 0; | |
839 | bgp_dump_attr(adv->baa->attr, send_attr_str, | |
5022c833 | 840 | sizeof(send_attr_str)); |
d62a17ae | 841 | } |
842 | } | |
843 | ||
844 | if ((afi == AFI_IP && safi == SAFI_UNICAST) | |
845 | && !peer_cap_enhe(peer, afi, safi)) | |
9bcb3eef | 846 | stream_put_prefix_addpath(s, dest_p, addpath_encode, |
d62a17ae | 847 | addpath_tx_id); |
848 | else { | |
849 | /* Encode the prefix in MP_REACH_NLRI attribute */ | |
9bcb3eef DS |
850 | if (dest->pdest) |
851 | prd = (struct prefix_rd *)bgp_dest_get_prefix( | |
852 | dest->pdest); | |
d62a17ae | 853 | |
b57ba6d2 | 854 | if (safi == SAFI_LABELED_UNICAST) { |
9bcb3eef | 855 | label = bgp_adv_label(dest, path, peer, afi, |
d62a17ae | 856 | safi); |
b57ba6d2 MK |
857 | label_pnt = &label; |
858 | num_labels = 1; | |
9b6d8fcf DS |
859 | } else if (path && path->extra) { |
860 | label_pnt = &path->extra->label[0]; | |
861 | num_labels = path->extra->num_labels; | |
b57ba6d2 | 862 | } |
d62a17ae | 863 | |
864 | if (stream_empty(snlri)) | |
865 | mpattrlen_pos = bgp_packet_mpattr_start( | |
866 | snlri, peer, afi, safi, &vecarr, | |
867 | adv->baa->attr); | |
868 | ||
9bcb3eef | 869 | bgp_packet_mpattr_prefix(snlri, afi, safi, dest_p, prd, |
b57ba6d2 MK |
870 | label_pnt, num_labels, |
871 | addpath_encode, addpath_tx_id, | |
872 | adv->baa->attr); | |
d62a17ae | 873 | } |
874 | ||
875 | num_pfx++; | |
876 | ||
9bcb3eef | 877 | if (bgp_debug_update(NULL, dest_p, subgrp->update_group, 0)) { |
d62a17ae | 878 | char pfx_buf[BGP_PRD_PATH_STRLEN]; |
879 | ||
880 | if (!send_attr_printed) { | |
6cde4b45 | 881 | zlog_debug("u%" PRIu64 ":s%" PRIu64" send UPDATE w/ attr: %s", |
d62a17ae | 882 | subgrp->update_group->id, subgrp->id, |
883 | send_attr_str); | |
884 | if (!stream_empty(snlri)) { | |
885 | iana_afi_t pkt_afi; | |
5c525538 | 886 | iana_safi_t pkt_safi; |
d62a17ae | 887 | |
888 | pkt_afi = afi_int2iana(afi); | |
889 | pkt_safi = safi_int2iana(safi); | |
890 | zlog_debug( | |
adf086ec DA |
891 | "u%" PRIu64 ":s%" PRIu64 |
892 | " send MP_REACH for afi/safi %s/%s", | |
d62a17ae | 893 | subgrp->update_group->id, |
adf086ec DA |
894 | subgrp->id, |
895 | iana_afi2str(pkt_afi), | |
896 | iana_safi2str(pkt_safi)); | |
d62a17ae | 897 | } |
898 | ||
899 | send_attr_printed = 1; | |
900 | } | |
901 | ||
9bcb3eef DS |
902 | bgp_debug_rdpfxpath2str(afi, safi, prd, dest_p, |
903 | label_pnt, num_labels, | |
904 | addpath_encode, addpath_tx_id, | |
905 | pfx_buf, sizeof(pfx_buf)); | |
d62a17ae | 906 | zlog_debug("u%" PRIu64 ":s%" PRIu64 " send UPDATE %s", |
907 | subgrp->update_group->id, subgrp->id, | |
908 | pfx_buf); | |
909 | } | |
910 | ||
911 | /* Synchnorize attribute. */ | |
912 | if (adj->attr) | |
913 | bgp_attr_unintern(&adj->attr); | |
914 | else | |
915 | subgrp->scount++; | |
916 | ||
917 | adj->attr = bgp_attr_intern(adv->baa->attr); | |
fde246e8 | 918 | next: |
d62a17ae | 919 | adv = bgp_advertise_clean_subgroup(subgrp, adj); |
3f9c7369 DS |
920 | } |
921 | ||
d62a17ae | 922 | if (!stream_empty(s)) { |
923 | if (!stream_empty(snlri)) { | |
924 | bgp_packet_mpattr_end(snlri, mpattrlen_pos); | |
925 | total_attr_len += stream_get_endp(snlri); | |
926 | } | |
927 | ||
928 | /* set the total attribute length correctly */ | |
929 | stream_putw_at(s, attrlen_pos, total_attr_len); | |
930 | ||
931 | if (!stream_empty(snlri)) { | |
932 | packet = stream_dupcat(s, snlri, mpattr_pos); | |
933 | bpacket_attr_vec_arr_update(&vecarr, mpattr_pos); | |
934 | } else | |
935 | packet = stream_dup(s); | |
936 | bgp_packet_set_size(packet); | |
937 | if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0)) | |
6cde4b45 | 938 | zlog_debug("u%" PRIu64 ":s%" PRIu64" send UPDATE len %zd numpfx %d", |
d62a17ae | 939 | subgrp->update_group->id, subgrp->id, |
940 | (stream_get_endp(packet) | |
941 | - stream_get_getp(packet)), | |
942 | num_pfx); | |
943 | pkt = bpacket_queue_add(SUBGRP_PKTQ(subgrp), packet, &vecarr); | |
944 | stream_reset(s); | |
945 | stream_reset(snlri); | |
946 | return pkt; | |
3f9c7369 | 947 | } |
d62a17ae | 948 | return NULL; |
3f9c7369 DS |
949 | } |
950 | ||
951 | /* Make BGP withdraw packet. */ | |
952 | /* For ipv4 unicast: | |
953 | 16-octet marker | 2-octet length | 1-octet type | | |
954 | 2-octet withdrawn route length | withdrawn prefixes | 2-octet attrlen (=0) | |
955 | */ | |
956 | /* For other afi/safis: | |
957 | 16-octet marker | 2-octet length | 1-octet type | | |
958 | 2-octet withdrawn route length (=0) | 2-octet attrlen | | |
959 | mp_unreach attr type | attr len | afi | safi | withdrawn prefixes | |
960 | */ | |
d62a17ae | 961 | struct bpacket *subgroup_withdraw_packet(struct update_subgroup *subgrp) |
3f9c7369 | 962 | { |
d62a17ae | 963 | struct bpacket *pkt; |
964 | struct stream *s; | |
965 | struct bgp_adj_out *adj; | |
966 | struct bgp_advertise *adv; | |
967 | struct peer *peer; | |
9bcb3eef | 968 | struct bgp_dest *dest; |
d62a17ae | 969 | bgp_size_t unfeasible_len; |
970 | bgp_size_t total_attr_len; | |
971 | size_t mp_start = 0; | |
972 | size_t attrlen_pos = 0; | |
973 | size_t mplen_pos = 0; | |
d7c0a89a | 974 | uint8_t first_time = 1; |
d62a17ae | 975 | afi_t afi; |
976 | safi_t safi; | |
977 | int space_remaining = 0; | |
978 | int space_needed = 0; | |
979 | int num_pfx = 0; | |
980 | int addpath_encode = 0; | |
e386c1d5 | 981 | int addpath_overhead = 0; |
d7c0a89a | 982 | uint32_t addpath_tx_id = 0; |
b54892e0 | 983 | const struct prefix_rd *prd = NULL; |
d62a17ae | 984 | |
985 | ||
986 | if (!subgrp) | |
987 | return NULL; | |
3f9c7369 | 988 | |
d62a17ae | 989 | if (bpacket_queue_is_full(SUBGRP_INST(subgrp), SUBGRP_PKTQ(subgrp))) |
990 | return NULL; | |
906ad49b | 991 | |
d62a17ae | 992 | peer = SUBGRP_PEER(subgrp); |
993 | afi = SUBGRP_AFI(subgrp); | |
994 | safi = SUBGRP_SAFI(subgrp); | |
995 | s = subgrp->work; | |
996 | stream_reset(s); | |
997 | addpath_encode = bgp_addpath_encode_tx(peer, afi, safi); | |
e386c1d5 | 998 | addpath_overhead = addpath_encode ? BGP_ADDPATH_ID_LEN : 0; |
d62a17ae | 999 | |
a274fef8 | 1000 | while ((adv = bgp_adv_fifo_first(&subgrp->sync->withdraw)) != NULL) { |
9bcb3eef | 1001 | const struct prefix *dest_p; |
b54892e0 | 1002 | |
9bcb3eef | 1003 | assert(adv->dest); |
d62a17ae | 1004 | adj = adv->adj; |
9bcb3eef DS |
1005 | dest = adv->dest; |
1006 | dest_p = bgp_dest_get_prefix(dest); | |
d62a17ae | 1007 | addpath_tx_id = adj->addpath_tx_id; |
1008 | ||
1009 | space_remaining = | |
2d34fb80 | 1010 | STREAM_WRITEABLE(s) - BGP_MAX_PACKET_SIZE_OVERFLOW; |
9bcb3eef DS |
1011 | space_needed = |
1012 | BGP_NLRI_LENGTH + addpath_overhead + BGP_TOTAL_ATTR_LEN | |
1013 | + bgp_packet_mpattr_prefix_size(afi, safi, dest_p); | |
d62a17ae | 1014 | |
1015 | if (space_remaining < space_needed) | |
1016 | break; | |
1017 | ||
1018 | if (stream_empty(s)) { | |
1019 | bgp_packet_set_marker(s, BGP_MSG_UPDATE); | |
1020 | stream_putw(s, 0); /* unfeasible routes length */ | |
1021 | } else | |
1022 | first_time = 0; | |
1023 | ||
1024 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
1025 | && !peer_cap_enhe(peer, afi, safi)) | |
9bcb3eef | 1026 | stream_put_prefix_addpath(s, dest_p, addpath_encode, |
d62a17ae | 1027 | addpath_tx_id); |
1028 | else { | |
9bcb3eef DS |
1029 | if (dest->pdest) |
1030 | prd = (struct prefix_rd *)bgp_dest_get_prefix( | |
1031 | dest->pdest); | |
d62a17ae | 1032 | |
b54892e0 DS |
1033 | /* If first time, format the MP_UNREACH header |
1034 | */ | |
d62a17ae | 1035 | if (first_time) { |
1036 | iana_afi_t pkt_afi; | |
5c525538 | 1037 | iana_safi_t pkt_safi; |
d62a17ae | 1038 | |
1039 | pkt_afi = afi_int2iana(afi); | |
1040 | pkt_safi = safi_int2iana(safi); | |
1041 | ||
1042 | attrlen_pos = stream_get_endp(s); | |
b54892e0 DS |
1043 | /* total attr length = 0 for now. |
1044 | * reevaluate later */ | |
d62a17ae | 1045 | stream_putw(s, 0); |
1046 | mp_start = stream_get_endp(s); | |
1047 | mplen_pos = bgp_packet_mpunreach_start(s, afi, | |
1048 | safi); | |
1049 | if (bgp_debug_update(NULL, NULL, | |
1050 | subgrp->update_group, 0)) | |
1051 | zlog_debug( | |
adf086ec DA |
1052 | "u%" PRIu64 ":s%" PRIu64 |
1053 | " send MP_UNREACH for afi/safi %s/%s", | |
d62a17ae | 1054 | subgrp->update_group->id, |
adf086ec DA |
1055 | subgrp->id, |
1056 | iana_afi2str(pkt_afi), | |
1057 | iana_safi2str(pkt_safi)); | |
d62a17ae | 1058 | } |
1059 | ||
9bcb3eef | 1060 | bgp_packet_mpunreach_prefix(s, dest_p, afi, safi, prd, |
b57ba6d2 | 1061 | NULL, 0, addpath_encode, |
d62a17ae | 1062 | addpath_tx_id, NULL); |
1063 | } | |
1064 | ||
1065 | num_pfx++; | |
1066 | ||
9bcb3eef | 1067 | if (bgp_debug_update(NULL, dest_p, subgrp->update_group, 0)) { |
d62a17ae | 1068 | char pfx_buf[BGP_PRD_PATH_STRLEN]; |
1069 | ||
9bcb3eef | 1070 | bgp_debug_rdpfxpath2str(afi, safi, prd, dest_p, NULL, 0, |
d62a17ae | 1071 | addpath_encode, addpath_tx_id, |
1072 | pfx_buf, sizeof(pfx_buf)); | |
6cde4b45 | 1073 | zlog_debug("u%" PRIu64 ":s%" PRIu64" send UPDATE %s -- unreachable", |
d62a17ae | 1074 | subgrp->update_group->id, subgrp->id, |
1075 | pfx_buf); | |
1076 | } | |
1077 | ||
1078 | subgrp->scount--; | |
1079 | ||
9bcb3eef DS |
1080 | bgp_adj_out_remove_subgroup(dest, adj, subgrp); |
1081 | bgp_dest_unlock_node(dest); | |
3f9c7369 DS |
1082 | } |
1083 | ||
d62a17ae | 1084 | if (!stream_empty(s)) { |
1085 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
1086 | && !peer_cap_enhe(peer, afi, safi)) { | |
1087 | unfeasible_len = stream_get_endp(s) - BGP_HEADER_SIZE | |
1088 | - BGP_UNFEASIBLE_LEN; | |
1089 | stream_putw_at(s, BGP_HEADER_SIZE, unfeasible_len); | |
1090 | stream_putw(s, 0); | |
1091 | } else { | |
1092 | /* Set the mp_unreach attr's length */ | |
1093 | bgp_packet_mpunreach_end(s, mplen_pos); | |
1094 | ||
1095 | /* Set total path attribute length. */ | |
1096 | total_attr_len = stream_get_endp(s) - mp_start; | |
1097 | stream_putw_at(s, attrlen_pos, total_attr_len); | |
1098 | } | |
1099 | bgp_packet_set_size(s); | |
1100 | if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0)) | |
6cde4b45 | 1101 | zlog_debug("u%" PRIu64 ":s%" PRIu64" send UPDATE (withdraw) len %zd numpfx %d", |
d62a17ae | 1102 | subgrp->update_group->id, subgrp->id, |
1103 | (stream_get_endp(s) - stream_get_getp(s)), | |
1104 | num_pfx); | |
1105 | pkt = bpacket_queue_add(SUBGRP_PKTQ(subgrp), stream_dup(s), | |
1106 | NULL); | |
1107 | stream_reset(s); | |
1108 | return pkt; | |
3f9c7369 | 1109 | } |
3f9c7369 | 1110 | |
d62a17ae | 1111 | return NULL; |
3f9c7369 DS |
1112 | } |
1113 | ||
d62a17ae | 1114 | void subgroup_default_update_packet(struct update_subgroup *subgrp, |
1115 | struct attr *attr, struct peer *from) | |
3f9c7369 | 1116 | { |
d62a17ae | 1117 | struct stream *s; |
1118 | struct peer *peer; | |
1119 | struct prefix p; | |
1120 | unsigned long pos; | |
1121 | bgp_size_t total_attr_len; | |
1122 | afi_t afi; | |
1123 | safi_t safi; | |
1124 | struct bpacket_attr_vec_arr vecarr; | |
1125 | int addpath_encode = 0; | |
1126 | ||
1127 | if (DISABLE_BGP_ANNOUNCE) | |
1128 | return; | |
1129 | ||
1130 | if (!subgrp) | |
1131 | return; | |
1132 | ||
1133 | peer = SUBGRP_PEER(subgrp); | |
1134 | afi = SUBGRP_AFI(subgrp); | |
1135 | safi = SUBGRP_SAFI(subgrp); | |
1136 | bpacket_attr_vec_arr_reset(&vecarr); | |
1137 | addpath_encode = bgp_addpath_encode_tx(peer, afi, safi); | |
1138 | ||
cbb65f5e RW |
1139 | memset(&p, 0, sizeof(p)); |
1140 | p.family = afi2family(afi); | |
1141 | p.prefixlen = 0; | |
d62a17ae | 1142 | |
1143 | /* Logging the attribute. */ | |
1144 | if (bgp_debug_update(NULL, &p, subgrp->update_group, 0)) { | |
1145 | char attrstr[BUFSIZ]; | |
d62a17ae | 1146 | /* ' with addpath ID ' 17 |
1147 | * max strlen of uint32 + 10 | |
1148 | * +/- (just in case) + 1 | |
1149 | * null terminator + 1 | |
1150 | * ============================ 29 */ | |
1151 | char tx_id_buf[30]; | |
1152 | ||
1153 | attrstr[0] = '\0'; | |
1154 | ||
5022c833 | 1155 | bgp_dump_attr(attr, attrstr, sizeof(attrstr)); |
d62a17ae | 1156 | |
1157 | if (addpath_encode) | |
1158 | snprintf(tx_id_buf, sizeof(tx_id_buf), | |
1159 | " with addpath ID %u", | |
1160 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
cbb263cf DS |
1161 | else |
1162 | tx_id_buf[0] = '\0'; | |
d62a17ae | 1163 | |
2dbe669b DA |
1164 | zlog_debug("u%" PRIu64 ":s%" PRIu64 " send UPDATE %pFX%s %s", |
1165 | (SUBGRP_UPDGRP(subgrp))->id, subgrp->id, &p, | |
1166 | tx_id_buf, attrstr); | |
d62a17ae | 1167 | } |
3f9c7369 | 1168 | |
d62a17ae | 1169 | s = stream_new(BGP_MAX_PACKET_SIZE); |
3f9c7369 | 1170 | |
d62a17ae | 1171 | /* Make BGP update packet. */ |
1172 | bgp_packet_set_marker(s, BGP_MSG_UPDATE); | |
3f9c7369 | 1173 | |
d62a17ae | 1174 | /* Unfeasible Routes Length. */ |
1175 | stream_putw(s, 0); | |
3f9c7369 | 1176 | |
d62a17ae | 1177 | /* Make place for total attribute length. */ |
1178 | pos = stream_get_endp(s); | |
1179 | stream_putw(s, 0); | |
1180 | total_attr_len = bgp_packet_attribute( | |
1181 | NULL, peer, s, attr, &vecarr, &p, afi, safi, from, NULL, NULL, | |
b57ba6d2 | 1182 | 0, addpath_encode, BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); |
3f9c7369 | 1183 | |
d62a17ae | 1184 | /* Set Total Path Attribute Length. */ |
1185 | stream_putw_at(s, pos, total_attr_len); | |
3f9c7369 | 1186 | |
d62a17ae | 1187 | /* NLRI set. */ |
1188 | if (p.family == AF_INET && safi == SAFI_UNICAST | |
1189 | && !peer_cap_enhe(peer, afi, safi)) | |
1190 | stream_put_prefix_addpath( | |
1191 | s, &p, addpath_encode, | |
1192 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
3f9c7369 | 1193 | |
d62a17ae | 1194 | /* Set size. */ |
1195 | bgp_packet_set_size(s); | |
3f9c7369 | 1196 | |
d62a17ae | 1197 | (void)bpacket_queue_add(SUBGRP_PKTQ(subgrp), s, &vecarr); |
2fc102e1 | 1198 | subgroup_trigger_write(subgrp); |
3f9c7369 DS |
1199 | } |
1200 | ||
d62a17ae | 1201 | void subgroup_default_withdraw_packet(struct update_subgroup *subgrp) |
3f9c7369 | 1202 | { |
d62a17ae | 1203 | struct peer *peer; |
1204 | struct stream *s; | |
1205 | struct prefix p; | |
1206 | unsigned long attrlen_pos = 0; | |
1207 | unsigned long cp; | |
1208 | bgp_size_t unfeasible_len; | |
1209 | bgp_size_t total_attr_len = 0; | |
1210 | size_t mp_start = 0; | |
1211 | size_t mplen_pos = 0; | |
1212 | afi_t afi; | |
1213 | safi_t safi; | |
1214 | int addpath_encode = 0; | |
1215 | ||
1216 | if (DISABLE_BGP_ANNOUNCE) | |
1217 | return; | |
1218 | ||
1219 | peer = SUBGRP_PEER(subgrp); | |
1220 | afi = SUBGRP_AFI(subgrp); | |
1221 | safi = SUBGRP_SAFI(subgrp); | |
1222 | addpath_encode = bgp_addpath_encode_tx(peer, afi, safi); | |
1223 | ||
cbb65f5e RW |
1224 | memset(&p, 0, sizeof(p)); |
1225 | p.family = afi2family(afi); | |
1226 | p.prefixlen = 0; | |
d62a17ae | 1227 | |
1228 | if (bgp_debug_update(NULL, &p, subgrp->update_group, 0)) { | |
d62a17ae | 1229 | /* ' with addpath ID ' 17 |
1230 | * max strlen of uint32 + 10 | |
1231 | * +/- (just in case) + 1 | |
1232 | * null terminator + 1 | |
1233 | * ============================ 29 */ | |
1234 | char tx_id_buf[30]; | |
1235 | ||
1236 | if (addpath_encode) | |
1237 | snprintf(tx_id_buf, sizeof(tx_id_buf), | |
1238 | " with addpath ID %u", | |
1239 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
1240 | ||
2dbe669b DA |
1241 | zlog_debug("u%" PRIu64 ":s%" PRIu64 |
1242 | " send UPDATE %pFX%s -- unreachable", | |
1243 | (SUBGRP_UPDGRP(subgrp))->id, subgrp->id, &p, | |
1244 | tx_id_buf); | |
d62a17ae | 1245 | } |
3f9c7369 | 1246 | |
d62a17ae | 1247 | s = stream_new(BGP_MAX_PACKET_SIZE); |
3f9c7369 | 1248 | |
d62a17ae | 1249 | /* Make BGP update packet. */ |
1250 | bgp_packet_set_marker(s, BGP_MSG_UPDATE); | |
3f9c7369 | 1251 | |
d62a17ae | 1252 | /* Unfeasible Routes Length. */; |
1253 | cp = stream_get_endp(s); | |
1254 | stream_putw(s, 0); | |
3f9c7369 | 1255 | |
d62a17ae | 1256 | /* Withdrawn Routes. */ |
1257 | if (p.family == AF_INET && safi == SAFI_UNICAST | |
1258 | && !peer_cap_enhe(peer, afi, safi)) { | |
1259 | stream_put_prefix_addpath( | |
1260 | s, &p, addpath_encode, | |
1261 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
3f9c7369 | 1262 | |
d62a17ae | 1263 | unfeasible_len = stream_get_endp(s) - cp - 2; |
3f9c7369 | 1264 | |
d62a17ae | 1265 | /* Set unfeasible len. */ |
1266 | stream_putw_at(s, cp, unfeasible_len); | |
3f9c7369 | 1267 | |
d62a17ae | 1268 | /* Set total path attribute length. */ |
1269 | stream_putw(s, 0); | |
1270 | } else { | |
1271 | attrlen_pos = stream_get_endp(s); | |
1272 | stream_putw(s, 0); | |
1273 | mp_start = stream_get_endp(s); | |
1274 | mplen_pos = bgp_packet_mpunreach_start(s, afi, safi); | |
1275 | bgp_packet_mpunreach_prefix( | |
b57ba6d2 | 1276 | s, &p, afi, safi, NULL, NULL, 0, addpath_encode, |
d62a17ae | 1277 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE, NULL); |
3f9c7369 | 1278 | |
d62a17ae | 1279 | /* Set the mp_unreach attr's length */ |
1280 | bgp_packet_mpunreach_end(s, mplen_pos); | |
3f9c7369 | 1281 | |
d62a17ae | 1282 | /* Set total path attribute length. */ |
1283 | total_attr_len = stream_get_endp(s) - mp_start; | |
1284 | stream_putw_at(s, attrlen_pos, total_attr_len); | |
1285 | } | |
1286 | ||
1287 | bgp_packet_set_size(s); | |
1288 | ||
1289 | (void)bpacket_queue_add(SUBGRP_PKTQ(subgrp), s, NULL); | |
2fc102e1 | 1290 | subgroup_trigger_write(subgrp); |
3f9c7369 DS |
1291 | } |
1292 | ||
1293 | static void | |
d62a17ae | 1294 | bpacket_vec_arr_inherit_attr_flags(struct bpacket_attr_vec_arr *vecarr, |
1295 | bpacket_attr_vec_type type, | |
1296 | struct attr *attr) | |
3f9c7369 | 1297 | { |
d62a17ae | 1298 | if (CHECK_FLAG(attr->rmap_change_flags, |
1299 | BATTR_RMAP_NEXTHOP_PEER_ADDRESS)) | |
1300 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1301 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS); | |
1302 | ||
1303 | if (CHECK_FLAG(attr->rmap_change_flags, BATTR_REFLECTED)) | |
1304 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1305 | BPKT_ATTRVEC_FLAGS_REFLECTED); | |
1306 | ||
1307 | if (CHECK_FLAG(attr->rmap_change_flags, BATTR_RMAP_NEXTHOP_UNCHANGED)) | |
1308 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1309 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED); | |
1310 | ||
1311 | if (CHECK_FLAG(attr->rmap_change_flags, BATTR_RMAP_IPV4_NHOP_CHANGED)) | |
1312 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1313 | BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED); | |
1314 | ||
1315 | if (CHECK_FLAG(attr->rmap_change_flags, | |
1316 | BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED)) | |
1317 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1318 | BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED); | |
1319 | ||
1320 | if (CHECK_FLAG(attr->rmap_change_flags, | |
1321 | BATTR_RMAP_IPV6_LL_NHOP_CHANGED)) | |
1322 | SET_FLAG(vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1323 | BPKT_ATTRVEC_FLAGS_RMAP_IPV6_LNH_CHANGED); | |
3f9c7369 DS |
1324 | } |
1325 | ||
1326 | /* Reset the Attributes vector array. The vector array is used to override | |
1327 | * certain output parameters in the packet for a particular peer | |
1328 | */ | |
d62a17ae | 1329 | void bpacket_attr_vec_arr_reset(struct bpacket_attr_vec_arr *vecarr) |
3f9c7369 | 1330 | { |
d62a17ae | 1331 | int i; |
3f9c7369 | 1332 | |
d62a17ae | 1333 | if (!vecarr) |
1334 | return; | |
3f9c7369 | 1335 | |
d62a17ae | 1336 | i = 0; |
1337 | while (i < BGP_ATTR_VEC_MAX) { | |
1338 | vecarr->entries[i].flags = 0; | |
1339 | vecarr->entries[i].offset = 0; | |
1340 | i++; | |
1341 | } | |
3f9c7369 DS |
1342 | } |
1343 | ||
1344 | /* Setup a particular node entry in the vecarr */ | |
d62a17ae | 1345 | void bpacket_attr_vec_arr_set_vec(struct bpacket_attr_vec_arr *vecarr, |
1346 | bpacket_attr_vec_type type, struct stream *s, | |
1347 | struct attr *attr) | |
3f9c7369 | 1348 | { |
d62a17ae | 1349 | if (!vecarr) |
1350 | return; | |
1351 | assert(type < BGP_ATTR_VEC_MAX); | |
1352 | ||
1353 | SET_FLAG(vecarr->entries[type].flags, BPKT_ATTRVEC_FLAGS_UPDATED); | |
1354 | vecarr->entries[type].offset = stream_get_endp(s); | |
1355 | if (attr) | |
1356 | bpacket_vec_arr_inherit_attr_flags(vecarr, type, attr); | |
3f9c7369 | 1357 | } |