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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" | |
49 | #include "bgpd/bgp_fsm.h" | |
50 | #include "bgpd/bgp_route.h" | |
51 | #include "bgpd/bgp_packet.h" | |
52 | #include "bgpd/bgp_advertise.h" | |
53 | #include "bgpd/bgp_updgrp.h" | |
54 | #include "bgpd/bgp_nexthop.h" | |
55 | #include "bgpd/bgp_nht.h" | |
906ad49b | 56 | #include "bgpd/bgp_mplsvpn.h" |
cd1964ff | 57 | #include "bgpd/bgp_label.h" |
3f9c7369 DS |
58 | |
59 | /******************** | |
60 | * PRIVATE FUNCTIONS | |
61 | ********************/ | |
62 | ||
63 | /******************** | |
64 | * PUBLIC FUNCTIONS | |
65 | ********************/ | |
66 | struct bpacket * | |
67 | bpacket_alloc () | |
68 | { | |
69 | struct bpacket *pkt; | |
70 | ||
71 | pkt = | |
72 | (struct bpacket *) XCALLOC (MTYPE_BGP_PACKET, sizeof (struct bpacket)); | |
73 | ||
74 | return pkt; | |
75 | } | |
76 | ||
77 | void | |
78 | bpacket_free (struct bpacket *pkt) | |
79 | { | |
80 | if (pkt->buffer) | |
81 | stream_free (pkt->buffer); | |
82 | pkt->buffer = NULL; | |
83 | XFREE (MTYPE_BGP_PACKET, pkt); | |
84 | } | |
85 | ||
86 | void | |
87 | bpacket_queue_init (struct bpacket_queue *q) | |
88 | { | |
89 | TAILQ_INIT (&(q->pkts)); | |
90 | } | |
91 | ||
92 | /* | |
93 | * bpacket_queue_sanity_check | |
94 | */ | |
95 | void | |
96 | bpacket_queue_sanity_check (struct bpacket_queue __attribute__ ((__unused__)) *q) | |
97 | { | |
98 | #if 0 | |
99 | struct bpacket *pkt; | |
100 | ||
101 | pkt = bpacket_queue_last (q); | |
102 | assert (pkt); | |
103 | assert (!pkt->buffer); | |
104 | ||
105 | /* | |
106 | * Make sure the count of packets is correct. | |
107 | */ | |
108 | int num_pkts = 0; | |
109 | ||
110 | pkt = bpacket_queue_first (q); | |
111 | while (pkt) | |
112 | { | |
113 | num_pkts++; | |
114 | ||
115 | if (num_pkts > q->curr_count) | |
116 | assert (0); | |
117 | ||
118 | pkt = TAILQ_NEXT (pkt, pkt_train); | |
119 | } | |
120 | ||
121 | assert (num_pkts == q->curr_count); | |
122 | #endif | |
123 | } | |
124 | ||
125 | /* | |
126 | * bpacket_queue_add_packet | |
127 | * | |
128 | * Internal function of bpacket_queue - and adds a | |
129 | * packet entry to the end of the list. | |
130 | * | |
131 | * Users of bpacket_queue should use bpacket_queue_add instead. | |
132 | */ | |
133 | static void | |
134 | bpacket_queue_add_packet (struct bpacket_queue *q, struct bpacket *pkt) | |
135 | { | |
136 | struct bpacket *last_pkt; | |
137 | ||
138 | if (TAILQ_EMPTY (&(q->pkts))) | |
139 | TAILQ_INSERT_TAIL (&(q->pkts), pkt, pkt_train); | |
140 | else | |
141 | { | |
142 | last_pkt = bpacket_queue_last (q); | |
143 | TAILQ_INSERT_AFTER (&(q->pkts), last_pkt, pkt, pkt_train); | |
144 | } | |
145 | q->curr_count++; | |
146 | if (q->hwm_count < q->curr_count) | |
147 | q->hwm_count = q->curr_count; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Adds a packet to the bpacket_queue. | |
152 | * | |
153 | * The stream passed is consumed by this function. So, the caller should | |
154 | * not free or use the stream after | |
155 | * invoking this function. | |
156 | */ | |
157 | struct bpacket * | |
158 | bpacket_queue_add (struct bpacket_queue *q, struct stream *s, | |
159 | struct bpacket_attr_vec_arr *vecarrp) | |
160 | { | |
161 | struct bpacket *pkt; | |
162 | struct bpacket *last_pkt; | |
163 | ||
164 | ||
165 | pkt = bpacket_alloc (); | |
166 | if (TAILQ_EMPTY (&(q->pkts))) | |
167 | { | |
168 | pkt->ver = 1; | |
169 | pkt->buffer = s; | |
170 | if (vecarrp) | |
171 | memcpy (&pkt->arr, vecarrp, sizeof (struct bpacket_attr_vec_arr)); | |
172 | else | |
173 | bpacket_attr_vec_arr_reset (&pkt->arr); | |
174 | bpacket_queue_add_packet (q, pkt); | |
175 | bpacket_queue_sanity_check (q); | |
176 | return pkt; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Fill in the new information into the current sentinel and create a | |
181 | * new sentinel. | |
182 | */ | |
183 | bpacket_queue_sanity_check (q); | |
184 | last_pkt = bpacket_queue_last (q); | |
185 | assert (last_pkt->buffer == NULL); | |
186 | last_pkt->buffer = s; | |
187 | if (vecarrp) | |
188 | memcpy (&last_pkt->arr, vecarrp, sizeof (struct bpacket_attr_vec_arr)); | |
189 | else | |
190 | bpacket_attr_vec_arr_reset (&last_pkt->arr); | |
191 | ||
192 | pkt->ver = last_pkt->ver; | |
193 | pkt->ver++; | |
194 | bpacket_queue_add_packet (q, pkt); | |
195 | ||
196 | bpacket_queue_sanity_check (q); | |
197 | return last_pkt; | |
198 | } | |
199 | ||
200 | struct bpacket * | |
201 | bpacket_queue_first (struct bpacket_queue *q) | |
202 | { | |
203 | return (TAILQ_FIRST (&(q->pkts))); | |
204 | } | |
205 | ||
206 | struct bpacket * | |
207 | bpacket_queue_last (struct bpacket_queue *q) | |
208 | { | |
209 | return TAILQ_LAST (&(q->pkts), pkt_queue); | |
210 | } | |
211 | ||
212 | struct bpacket * | |
213 | bpacket_queue_remove (struct bpacket_queue *q) | |
214 | { | |
215 | struct bpacket *first; | |
216 | ||
217 | first = bpacket_queue_first (q); | |
218 | if (first) | |
219 | { | |
220 | TAILQ_REMOVE (&(q->pkts), first, pkt_train); | |
221 | q->curr_count--; | |
222 | } | |
223 | return first; | |
224 | } | |
225 | ||
226 | unsigned int | |
227 | bpacket_queue_length (struct bpacket_queue *q) | |
228 | { | |
229 | return q->curr_count - 1; | |
230 | } | |
231 | ||
232 | unsigned int | |
233 | bpacket_queue_hwm_length (struct bpacket_queue *q) | |
234 | { | |
235 | return q->hwm_count - 1; | |
236 | } | |
237 | ||
238 | int | |
239 | bpacket_queue_is_full (struct bgp *bgp, struct bpacket_queue *q) | |
240 | { | |
241 | if (q->curr_count >= bgp->default_subgroup_pkt_queue_max) | |
242 | return 1; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | void | |
247 | bpacket_add_peer (struct bpacket *pkt, struct peer_af *paf) | |
248 | { | |
249 | if (!pkt || !paf) | |
250 | return; | |
251 | ||
252 | LIST_INSERT_HEAD (&(pkt->peers), paf, pkt_train); | |
253 | paf->next_pkt_to_send = pkt; | |
254 | } | |
255 | ||
256 | /* | |
257 | * bpacket_queue_cleanup | |
258 | */ | |
259 | void | |
260 | bpacket_queue_cleanup (struct bpacket_queue *q) | |
261 | { | |
262 | struct bpacket *pkt; | |
263 | ||
264 | while ((pkt = bpacket_queue_remove (q))) | |
265 | { | |
266 | bpacket_free (pkt); | |
267 | } | |
268 | } | |
269 | ||
270 | /* | |
271 | * bpacket_queue_compact | |
272 | * | |
273 | * Delete packets that do not need to be transmitted to any peer from | |
274 | * the queue. | |
275 | * | |
276 | * @return the number of packets deleted. | |
277 | */ | |
278 | static int | |
279 | bpacket_queue_compact (struct bpacket_queue *q) | |
280 | { | |
281 | int num_deleted; | |
282 | struct bpacket *pkt, *removed_pkt; | |
283 | ||
284 | num_deleted = 0; | |
285 | ||
286 | while (1) | |
287 | { | |
288 | pkt = bpacket_queue_first (q); | |
289 | if (!pkt) | |
290 | break; | |
291 | ||
292 | /* | |
293 | * Don't delete the sentinel. | |
294 | */ | |
295 | if (!pkt->buffer) | |
296 | break; | |
297 | ||
298 | if (!LIST_EMPTY (&(pkt->peers))) | |
299 | break; | |
300 | ||
301 | removed_pkt = bpacket_queue_remove (q); | |
302 | assert (pkt == removed_pkt); | |
303 | bpacket_free (removed_pkt); | |
304 | ||
305 | num_deleted++; | |
306 | } | |
307 | ||
308 | bpacket_queue_sanity_check (q); | |
309 | return num_deleted; | |
310 | } | |
311 | ||
312 | void | |
313 | bpacket_queue_advance_peer (struct peer_af *paf) | |
314 | { | |
315 | struct bpacket *pkt; | |
316 | struct bpacket *old_pkt; | |
317 | ||
318 | old_pkt = paf->next_pkt_to_send; | |
319 | if (old_pkt->buffer == NULL) | |
320 | /* Already at end of list */ | |
321 | return; | |
322 | ||
323 | LIST_REMOVE (paf, pkt_train); | |
324 | pkt = TAILQ_NEXT (old_pkt, pkt_train); | |
325 | bpacket_add_peer (pkt, paf); | |
326 | ||
327 | if (!bpacket_queue_compact (PAF_PKTQ (paf))) | |
328 | return; | |
329 | ||
330 | /* | |
331 | * Deleted one or more packets. Check if we can now merge this | |
332 | * peer's subgroup into another subgroup. | |
333 | */ | |
334 | update_subgroup_check_merge (paf->subgroup, "advanced peer in queue"); | |
335 | } | |
336 | ||
337 | /* | |
338 | * bpacket_queue_remove_peer | |
339 | * | |
340 | * Remove the peer from the packet queue of the subgroup it belongs | |
341 | * to. | |
342 | */ | |
343 | void | |
344 | bpacket_queue_remove_peer (struct peer_af *paf) | |
345 | { | |
346 | struct bpacket_queue *q; | |
347 | ||
348 | q = PAF_PKTQ (paf); | |
349 | assert (q); | |
350 | if (!q) | |
351 | return; | |
352 | ||
353 | LIST_REMOVE (paf, pkt_train); | |
354 | paf->next_pkt_to_send = NULL; | |
355 | ||
356 | bpacket_queue_compact (q); | |
357 | } | |
358 | ||
359 | unsigned int | |
360 | bpacket_queue_virtual_length (struct peer_af *paf) | |
361 | { | |
362 | struct bpacket *pkt; | |
363 | struct bpacket *last; | |
364 | struct bpacket_queue *q; | |
365 | ||
366 | pkt = paf->next_pkt_to_send; | |
367 | if (!pkt || (pkt->buffer == NULL)) | |
368 | /* Already at end of list */ | |
369 | return 0; | |
370 | ||
371 | q = PAF_PKTQ (paf); | |
372 | if (TAILQ_EMPTY (&(q->pkts))) | |
373 | return 0; | |
374 | ||
375 | last = TAILQ_LAST (&(q->pkts), pkt_queue); | |
376 | if (last->ver >= pkt->ver) | |
377 | return last->ver - pkt->ver; | |
378 | ||
379 | /* sequence # rolled over */ | |
380 | return (UINT_MAX - pkt->ver + 1) + last->ver; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Dump the bpacket queue | |
385 | */ | |
386 | void | |
387 | bpacket_queue_show_vty (struct bpacket_queue *q, struct vty *vty) | |
388 | { | |
389 | struct bpacket *pkt; | |
390 | struct peer_af *paf; | |
391 | ||
392 | pkt = bpacket_queue_first (q); | |
393 | while (pkt) | |
394 | { | |
96ade3ed QY |
395 | vty_outln (vty, " Packet %p ver %u buffer %p", pkt, pkt->ver, |
396 | pkt->buffer); | |
3f9c7369 DS |
397 | |
398 | LIST_FOREACH (paf, &(pkt->peers), pkt_train) | |
399 | { | |
96ade3ed | 400 | vty_outln (vty, " - %s", paf->peer->host); |
3f9c7369 DS |
401 | } |
402 | pkt = bpacket_next (pkt); | |
403 | } | |
404 | return; | |
405 | } | |
406 | ||
407 | struct stream * | |
408 | bpacket_reformat_for_peer (struct bpacket *pkt, struct peer_af *paf) | |
409 | { | |
410 | struct stream *s = NULL; | |
411 | bpacket_attr_vec *vec; | |
3811f1e2 | 412 | struct peer *peer; |
325671b7 DS |
413 | char buf[BUFSIZ]; |
414 | char buf2[BUFSIZ]; | |
3f9c7369 DS |
415 | |
416 | s = stream_dup (pkt->buffer); | |
3811f1e2 | 417 | peer = PAF_PEER(paf); |
3f9c7369 DS |
418 | |
419 | vec = &pkt->arr.entries[BGP_ATTR_VEC_NH]; | |
3811f1e2 | 420 | if (CHECK_FLAG (vec->flags, BPKT_ATTRVEC_FLAGS_UPDATED)) |
3f9c7369 DS |
421 | { |
422 | u_int8_t nhlen; | |
e8d62659 | 423 | afi_t nhafi = AFI_MAX; /* NH AFI is based on nhlen! */ |
3f9c7369 DS |
424 | int route_map_sets_nh; |
425 | nhlen = stream_getc_from (s, vec->offset); | |
3684a40b | 426 | if (peer_cap_enhe(peer, paf->afi, paf->safi)) |
427 | nhafi = AFI_IP6; | |
428 | else | |
429 | nhafi = BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen); | |
e8d62659 LB |
430 | |
431 | if (nhafi == AFI_IP) | |
3f9c7369 | 432 | { |
3811f1e2 DS |
433 | struct in_addr v4nh, *mod_v4nh; |
434 | int nh_modified = 0; | |
3800c7b0 | 435 | size_t offset_nh = vec->offset + 1; |
3811f1e2 DS |
436 | |
437 | route_map_sets_nh = | |
438 | (CHECK_FLAG (vec->flags, BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED) || | |
439 | CHECK_FLAG (vec->flags, BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)); | |
3f9c7369 | 440 | |
3800c7b0 RW |
441 | switch (nhlen) |
442 | { | |
443 | case BGP_ATTR_NHLEN_IPV4: | |
444 | break; | |
445 | case BGP_ATTR_NHLEN_VPNV4: | |
446 | offset_nh += 8; | |
447 | break; | |
448 | default: | |
449 | /* TODO: handle IPv6 nexthops */ | |
450 | zlog_warn ("%s: %s: invalid MP nexthop length (AFI IP): %u", | |
451 | __func__, peer->host, nhlen); | |
29c60afb | 452 | stream_free (s); |
3800c7b0 RW |
453 | return NULL; |
454 | } | |
455 | ||
456 | stream_get_from (&v4nh, s, offset_nh, IPV4_MAX_BYTELEN); | |
3811f1e2 | 457 | mod_v4nh = &v4nh; |
3f9c7369 | 458 | |
3811f1e2 DS |
459 | /* |
460 | * If route-map has set the nexthop, that is always used; if it is | |
461 | * specified as peer-address, the peering address is picked up. | |
462 | * Otherwise, if NH is unavailable from attribute, the peering addr | |
463 | * is picked up; the "NH unavailable" case also covers next-hop-self | |
464 | * and some other scenarios -- see subgroup_announce_check(). In | |
465 | * all other cases, use the nexthop carried in the attribute unless | |
466 | * it is EBGP non-multiaccess and there is no next-hop-unchanged setting. | |
467 | * Note: It is assumed route-map cannot set the nexthop to an | |
468 | * invalid value. | |
3f9c7369 | 469 | */ |
3f9c7369 DS |
470 | if (route_map_sets_nh) |
471 | { | |
3811f1e2 DS |
472 | if (CHECK_FLAG(vec->flags, |
473 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) | |
474 | { | |
475 | mod_v4nh = &peer->nexthop.v4; | |
476 | nh_modified = 1; | |
477 | } | |
478 | } | |
479 | else if (!v4nh.s_addr) | |
480 | { | |
481 | mod_v4nh = &peer->nexthop.v4; | |
482 | nh_modified = 1; | |
483 | } | |
484 | else if (peer->sort == BGP_PEER_EBGP && | |
485 | (bgp_multiaccess_check_v4 (v4nh, peer) == 0) && | |
486 | !CHECK_FLAG(vec->flags, | |
487 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED) && | |
e8d62659 | 488 | !peer_af_flag_check (peer, nhafi, paf->safi, |
3811f1e2 DS |
489 | PEER_FLAG_NEXTHOP_UNCHANGED)) |
490 | { | |
e8d62659 | 491 | /* NOTE: not handling case where NH has new AFI */ |
3811f1e2 DS |
492 | mod_v4nh = &peer->nexthop.v4; |
493 | nh_modified = 1; | |
3f9c7369 | 494 | } |
3811f1e2 | 495 | |
e8d62659 | 496 | if (nh_modified) /* allow for VPN RD */ |
3800c7b0 | 497 | stream_put_in_addr_at (s, offset_nh, mod_v4nh); |
3f9c7369 | 498 | |
325671b7 | 499 | if (bgp_debug_update(peer, NULL, NULL, 0)) |
e8d62659 | 500 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " %s send UPDATE w/ nexthop %s%s", |
fe3ca08f | 501 | PAF_SUBGRP(paf)->update_group->id, PAF_SUBGRP(paf)->id, |
e8d62659 LB |
502 | peer->host, inet_ntoa (*mod_v4nh), |
503 | (nhlen == 12 ? " and RD" : "")); | |
3f9c7369 | 504 | } |
e8d62659 | 505 | else if (nhafi == AFI_IP6) |
3f9c7369 | 506 | { |
3811f1e2 DS |
507 | struct in6_addr v6nhglobal, *mod_v6nhg; |
508 | struct in6_addr v6nhlocal, *mod_v6nhl; | |
509 | int gnh_modified, lnh_modified; | |
3800c7b0 RW |
510 | size_t offset_nhglobal = vec->offset + 1; |
511 | size_t offset_nhlocal = vec->offset + 1; | |
3811f1e2 DS |
512 | |
513 | gnh_modified = lnh_modified = 0; | |
514 | mod_v6nhg = &v6nhglobal; | |
515 | mod_v6nhl = &v6nhlocal; | |
516 | ||
517 | route_map_sets_nh = | |
518 | (CHECK_FLAG (vec->flags, BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED) || | |
519 | CHECK_FLAG (vec->flags, BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)); | |
3f9c7369 DS |
520 | |
521 | /* | |
522 | * The logic here is rather similar to that for IPv4, the | |
3811f1e2 DS |
523 | * additional work being to handle 1 or 2 nexthops. Also, 3rd |
524 | * party nexthop is not propagated for EBGP right now. | |
3f9c7369 | 525 | */ |
3800c7b0 RW |
526 | switch (nhlen) |
527 | { | |
528 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: | |
529 | break; | |
530 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
531 | offset_nhlocal += IPV6_MAX_BYTELEN; | |
532 | break; | |
533 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
534 | offset_nhglobal += 8; | |
535 | break; | |
536 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
537 | offset_nhglobal += 8; | |
538 | offset_nhlocal += 8 * 2 + IPV6_MAX_BYTELEN; | |
539 | break; | |
540 | default: | |
541 | /* TODO: handle IPv4 nexthops */ | |
542 | zlog_warn ("%s: %s: invalid MP nexthop length (AFI IP6): %u", | |
543 | __func__, peer->host, nhlen); | |
29c60afb | 544 | stream_free (s); |
3800c7b0 RW |
545 | return NULL; |
546 | } | |
547 | ||
548 | stream_get_from (&v6nhglobal, s, offset_nhglobal, IPV6_MAX_BYTELEN); | |
3811f1e2 DS |
549 | if (route_map_sets_nh) |
550 | { | |
551 | if (CHECK_FLAG(vec->flags, | |
552 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) | |
553 | { | |
554 | mod_v6nhg = &peer->nexthop.v6_global; | |
555 | gnh_modified = 1; | |
556 | } | |
557 | } | |
558 | else if (IN6_IS_ADDR_UNSPECIFIED (&v6nhglobal)) | |
559 | { | |
560 | mod_v6nhg = &peer->nexthop.v6_global; | |
561 | gnh_modified = 1; | |
562 | } | |
563 | else if (peer->sort == BGP_PEER_EBGP && | |
564 | !CHECK_FLAG(vec->flags, | |
565 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED) && | |
e8d62659 | 566 | !peer_af_flag_check (peer, nhafi, paf->safi, |
3f9c7369 | 567 | PEER_FLAG_NEXTHOP_UNCHANGED)) |
3811f1e2 | 568 | { |
e8d62659 | 569 | /* NOTE: not handling case where NH has new AFI */ |
3811f1e2 DS |
570 | mod_v6nhg = &peer->nexthop.v6_global; |
571 | gnh_modified = 1; | |
572 | } | |
573 | ||
3f9c7369 | 574 | |
3800c7b0 RW |
575 | if (nhlen == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL || |
576 | nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
3f9c7369 | 577 | { |
3800c7b0 | 578 | stream_get_from (&v6nhlocal, s, offset_nhlocal, IPV6_MAX_BYTELEN); |
3f9c7369 | 579 | if (IN6_IS_ADDR_UNSPECIFIED (&v6nhlocal)) |
3811f1e2 DS |
580 | { |
581 | mod_v6nhl = &peer->nexthop.v6_local; | |
582 | lnh_modified = 1; | |
583 | } | |
3f9c7369 | 584 | } |
3811f1e2 DS |
585 | |
586 | if (gnh_modified) | |
3800c7b0 | 587 | stream_put_in6_addr_at (s, offset_nhglobal, mod_v6nhg); |
3811f1e2 | 588 | if (lnh_modified) |
3800c7b0 | 589 | stream_put_in6_addr_at (s, offset_nhlocal, mod_v6nhl); |
325671b7 DS |
590 | |
591 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
592 | { | |
e8d62659 LB |
593 | if (nhlen == 32 || nhlen == 48) |
594 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " %s send UPDATE w/ mp_nexthops %s, %s%s", | |
325671b7 DS |
595 | PAF_SUBGRP(paf)->update_group->id, |
596 | PAF_SUBGRP(paf)->id, | |
597 | peer->host, | |
598 | inet_ntop (AF_INET6, mod_v6nhg, buf, BUFSIZ), | |
e8d62659 LB |
599 | inet_ntop (AF_INET6, mod_v6nhl, buf2, BUFSIZ), |
600 | (nhlen == 48 ? " and RD" : "")); | |
325671b7 | 601 | else |
e8d62659 | 602 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " %s send UPDATE w/ mp_nexthop %s%s", |
325671b7 DS |
603 | PAF_SUBGRP(paf)->update_group->id, |
604 | PAF_SUBGRP(paf)->id, | |
605 | peer->host, | |
e8d62659 LB |
606 | inet_ntop (AF_INET6, mod_v6nhg, buf, BUFSIZ), |
607 | (nhlen == 24 ? " and RD" : "")); | |
325671b7 | 608 | } |
3f9c7369 | 609 | } |
128ea8ab | 610 | else if (paf->afi == AFI_L2VPN) |
611 | { | |
612 | struct in_addr v4nh, *mod_v4nh; | |
613 | int nh_modified = 0; | |
614 | ||
615 | stream_get_from (&v4nh, s, vec->offset + 1, 4); | |
616 | mod_v4nh = &v4nh; | |
617 | ||
618 | /* No route-map changes allowed for EVPN nexthops. */ | |
619 | if (!v4nh.s_addr) | |
620 | { | |
621 | mod_v4nh = &peer->nexthop.v4; | |
622 | nh_modified = 1; | |
623 | } | |
624 | ||
625 | if (nh_modified) | |
626 | stream_put_in_addr_at (s, vec->offset + 1, mod_v4nh); | |
627 | ||
628 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
629 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " %s send UPDATE w/ nexthop %s", | |
630 | PAF_SUBGRP(paf)->update_group->id, PAF_SUBGRP(paf)->id, | |
631 | peer->host, inet_ntoa (*mod_v4nh)); | |
632 | ||
633 | } | |
3f9c7369 DS |
634 | } |
635 | ||
3811f1e2 | 636 | bgp_packet_add (peer, s); |
3f9c7369 DS |
637 | return s; |
638 | } | |
639 | ||
640 | /* | |
641 | * Update the vecarr offsets to go beyond 'pos' bytes, i.e. add 'pos' | |
642 | * to each offset. | |
643 | */ | |
644 | static void | |
645 | bpacket_attr_vec_arr_update (struct bpacket_attr_vec_arr *vecarr, size_t pos) | |
646 | { | |
647 | int i; | |
648 | ||
649 | if (!vecarr) | |
650 | return; | |
651 | ||
652 | for (i = 0; i < BGP_ATTR_VEC_MAX; i++) | |
653 | vecarr->entries[i].offset += pos; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Return if there are packets to build for this subgroup. | |
658 | */ | |
659 | int | |
660 | subgroup_packets_to_build (struct update_subgroup *subgrp) | |
661 | { | |
662 | struct bgp_advertise *adv; | |
663 | ||
664 | if (!subgrp) | |
665 | return 0; | |
666 | ||
667 | adv = BGP_ADV_FIFO_HEAD (&subgrp->sync->withdraw); | |
668 | if (adv) | |
669 | return 1; | |
670 | ||
671 | adv = BGP_ADV_FIFO_HEAD (&subgrp->sync->update); | |
672 | if (adv) | |
673 | return 1; | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | /* Make BGP update packet. */ | |
679 | struct bpacket * | |
680 | subgroup_update_packet (struct update_subgroup *subgrp) | |
681 | { | |
682 | struct bpacket_attr_vec_arr vecarr; | |
683 | struct bpacket *pkt; | |
684 | struct peer *peer; | |
685 | struct stream *s; | |
686 | struct stream *snlri; | |
687 | struct stream *packet; | |
688 | struct bgp_adj_out *adj; | |
689 | struct bgp_advertise *adv; | |
690 | struct bgp_node *rn = NULL; | |
691 | struct bgp_info *binfo = NULL; | |
692 | bgp_size_t total_attr_len = 0; | |
693 | unsigned long attrlen_pos = 0; | |
694 | size_t mpattrlen_pos = 0; | |
695 | size_t mpattr_pos = 0; | |
696 | afi_t afi; | |
697 | safi_t safi; | |
698 | int space_remaining = 0; | |
699 | int space_needed = 0; | |
700 | char send_attr_str[BUFSIZ]; | |
ffd0c037 | 701 | int send_attr_printed = 0; |
3f9c7369 | 702 | int num_pfx = 0; |
adbac85e DW |
703 | int addpath_encode = 0; |
704 | u_int32_t addpath_tx_id = 0; | |
906ad49b | 705 | struct prefix_rd *prd = NULL; |
b16031a2 | 706 | mpls_label_t label = MPLS_INVALID_LABEL; |
3f9c7369 DS |
707 | |
708 | if (!subgrp) | |
709 | return NULL; | |
710 | ||
711 | if (bpacket_queue_is_full (SUBGRP_INST (subgrp), SUBGRP_PKTQ (subgrp))) | |
712 | return NULL; | |
713 | ||
3f9c7369 DS |
714 | peer = SUBGRP_PEER (subgrp); |
715 | afi = SUBGRP_AFI (subgrp); | |
716 | safi = SUBGRP_SAFI (subgrp); | |
717 | s = subgrp->work; | |
718 | stream_reset (s); | |
719 | snlri = subgrp->scratch; | |
720 | stream_reset (snlri); | |
721 | ||
722 | bpacket_attr_vec_arr_reset (&vecarr); | |
723 | ||
adbac85e DW |
724 | addpath_encode = bgp_addpath_encode_tx (peer, afi, safi); |
725 | ||
3f9c7369 DS |
726 | adv = BGP_ADV_FIFO_HEAD (&subgrp->sync->update); |
727 | while (adv) | |
728 | { | |
729 | assert (adv->rn); | |
730 | rn = adv->rn; | |
731 | adj = adv->adj; | |
adbac85e DW |
732 | addpath_tx_id = adj->addpath_tx_id; |
733 | binfo = adv->binfo; | |
3f9c7369 DS |
734 | |
735 | space_remaining = STREAM_CONCAT_REMAIN (s, snlri, STREAM_SIZE(s)) - | |
736 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
93b73dfa LB |
737 | space_needed = BGP_NLRI_LENGTH + |
738 | bgp_packet_mpattr_prefix_size (afi, safi, &rn->p); | |
3f9c7369 DS |
739 | |
740 | /* When remaining space can't include NLRI and it's length. */ | |
741 | if (space_remaining < space_needed) | |
742 | break; | |
743 | ||
744 | /* If packet is empty, set attribute. */ | |
745 | if (stream_empty (s)) | |
746 | { | |
747 | struct peer *from = NULL; | |
748 | ||
749 | if (binfo) | |
6407da5a | 750 | from = binfo->peer; |
3f9c7369 DS |
751 | |
752 | /* 1: Write the BGP message header - 16 bytes marker, 2 bytes length, | |
753 | * one byte message type. | |
754 | */ | |
755 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
756 | ||
757 | /* 2: withdrawn routes length */ | |
758 | stream_putw (s, 0); | |
759 | ||
760 | /* 3: total attributes length - attrlen_pos stores the position */ | |
761 | attrlen_pos = stream_get_endp (s); | |
762 | stream_putw (s, 0); | |
763 | ||
764 | /* 4: if there is MP_REACH_NLRI attribute, that should be the first | |
765 | * attribute, according to draft-ietf-idr-error-handling. Save the | |
766 | * position. | |
767 | */ | |
768 | mpattr_pos = stream_get_endp (s); | |
769 | ||
770 | /* 5: Encode all the attributes, except MP_REACH_NLRI attr. */ | |
771 | total_attr_len = bgp_packet_attribute (NULL, peer, s, | |
772 | adv->baa->attr, &vecarr, | |
6407da5a | 773 | NULL, afi, safi, |
774 | from, NULL, NULL, 0, 0); | |
3f9c7369 DS |
775 | |
776 | space_remaining = STREAM_CONCAT_REMAIN (s, snlri, STREAM_SIZE(s)) - | |
777 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
6407da5a | 778 | space_needed = BGP_NLRI_LENGTH + |
779 | bgp_packet_mpattr_prefix_size (afi, safi, &rn->p); | |
3f9c7369 DS |
780 | |
781 | /* If the attributes alone do not leave any room for NLRI then | |
782 | * return */ | |
783 | if (space_remaining < space_needed) | |
784 | { | |
ffd0c037 | 785 | zlog_err ("u%" PRIu64 ":s%" PRIu64 " attributes too long, cannot send UPDATE", |
3f9c7369 DS |
786 | subgrp->update_group->id, subgrp->id); |
787 | ||
788 | /* Flush the FIFO update queue */ | |
789 | while (adv) | |
790 | adv = bgp_advertise_clean_subgroup (subgrp, adj); | |
791 | return NULL; | |
792 | } | |
793 | ||
794 | if (BGP_DEBUG (update, UPDATE_OUT) || | |
795 | BGP_DEBUG (update, UPDATE_PREFIX)) | |
796 | { | |
797 | memset (send_attr_str, 0, BUFSIZ); | |
798 | send_attr_printed = 0; | |
9ff63e6f | 799 | bgp_dump_attr (adv->baa->attr, send_attr_str, BUFSIZ); |
3f9c7369 DS |
800 | } |
801 | } | |
802 | ||
8a92a8a0 | 803 | if ((afi == AFI_IP && safi == SAFI_UNICAST) && |
343e90c3 | 804 | !peer_cap_enhe(peer, afi, safi)) |
adbac85e | 805 | stream_put_prefix_addpath (s, &rn->p, addpath_encode, addpath_tx_id); |
3f9c7369 DS |
806 | else |
807 | { | |
808 | /* Encode the prefix in MP_REACH_NLRI attribute */ | |
3f9c7369 DS |
809 | if (rn->prn) |
810 | prd = (struct prefix_rd *) &rn->prn->p; | |
604bbacb DS |
811 | |
812 | if (safi == SAFI_LABELED_UNICAST) | |
9bedbb1e | 813 | label = bgp_adv_label(rn, binfo, peer, afi, safi); |
604bbacb DS |
814 | else |
815 | if (binfo && binfo->extra) | |
9bedbb1e | 816 | label = binfo->extra->label; |
604bbacb | 817 | |
3f9c7369 | 818 | if (stream_empty (snlri)) |
2b26882d | 819 | mpattrlen_pos = bgp_packet_mpattr_start (snlri, peer, afi, safi, |
343e90c3 | 820 | &vecarr, adv->baa->attr); |
b18825eb PG |
821 | |
822 | bgp_packet_mpattr_prefix (snlri, afi, safi, &rn->p, prd, | |
9bedbb1e | 823 | &label, addpath_encode, addpath_tx_id, adv->baa->attr); |
3f9c7369 DS |
824 | } |
825 | ||
826 | num_pfx++; | |
827 | ||
828 | if (bgp_debug_update(NULL, &rn->p, subgrp->update_group, 0)) | |
829 | { | |
906ad49b | 830 | char pfx_buf[BGP_PRD_PATH_STRLEN]; |
3f9c7369 DS |
831 | |
832 | if (!send_attr_printed) | |
833 | { | |
ffd0c037 | 834 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE w/ attr: %s", |
3f9c7369 | 835 | subgrp->update_group->id, subgrp->id, send_attr_str); |
cceb79ac DS |
836 | if (!stream_empty (snlri)) |
837 | { | |
fe460659 | 838 | iana_afi_t pkt_afi; |
cceb79ac DS |
839 | safi_t pkt_safi; |
840 | ||
841 | pkt_afi = afi_int2iana (afi); | |
842 | pkt_safi = safi_int2iana (safi); | |
843 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send MP_REACH for afi/safi %d/%d", | |
844 | subgrp->update_group->id, subgrp->id, pkt_afi, pkt_safi); | |
845 | } | |
846 | ||
3f9c7369 DS |
847 | send_attr_printed = 1; |
848 | } | |
849 | ||
b16031a2 | 850 | bgp_debug_rdpfxpath2str (afi, safi, prd, &rn->p, &label, |
851 | addpath_encode, addpath_tx_id, | |
852 | pfx_buf, sizeof (pfx_buf)); | |
853 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE %s", | |
854 | subgrp->update_group->id, subgrp->id, pfx_buf); | |
3f9c7369 DS |
855 | } |
856 | ||
857 | /* Synchnorize attribute. */ | |
858 | if (adj->attr) | |
859 | bgp_attr_unintern (&adj->attr); | |
860 | else | |
861 | subgrp->scount++; | |
862 | ||
863 | adj->attr = bgp_attr_intern (adv->baa->attr); | |
864 | ||
865 | adv = bgp_advertise_clean_subgroup (subgrp, adj); | |
866 | } | |
867 | ||
868 | if (!stream_empty (s)) | |
869 | { | |
870 | if (!stream_empty (snlri)) | |
871 | { | |
872 | bgp_packet_mpattr_end (snlri, mpattrlen_pos); | |
873 | total_attr_len += stream_get_endp (snlri); | |
874 | } | |
875 | ||
876 | /* set the total attribute length correctly */ | |
877 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
878 | ||
879 | if (!stream_empty (snlri)) | |
880 | { | |
881 | packet = stream_dupcat (s, snlri, mpattr_pos); | |
882 | bpacket_attr_vec_arr_update (&vecarr, mpattr_pos); | |
883 | } | |
884 | else | |
885 | packet = stream_dup (s); | |
886 | bgp_packet_set_size (packet); | |
887 | if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0)) | |
cceb79ac | 888 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE len %zd numpfx %d", |
3f9c7369 DS |
889 | subgrp->update_group->id, subgrp->id, |
890 | (stream_get_endp(packet) - stream_get_getp(packet)), num_pfx); | |
891 | pkt = bpacket_queue_add (SUBGRP_PKTQ (subgrp), packet, &vecarr); | |
892 | stream_reset (s); | |
893 | stream_reset (snlri); | |
894 | return pkt; | |
895 | } | |
896 | return NULL; | |
897 | } | |
898 | ||
899 | /* Make BGP withdraw packet. */ | |
900 | /* For ipv4 unicast: | |
901 | 16-octet marker | 2-octet length | 1-octet type | | |
902 | 2-octet withdrawn route length | withdrawn prefixes | 2-octet attrlen (=0) | |
903 | */ | |
904 | /* For other afi/safis: | |
905 | 16-octet marker | 2-octet length | 1-octet type | | |
906 | 2-octet withdrawn route length (=0) | 2-octet attrlen | | |
907 | mp_unreach attr type | attr len | afi | safi | withdrawn prefixes | |
908 | */ | |
909 | struct bpacket * | |
910 | subgroup_withdraw_packet (struct update_subgroup *subgrp) | |
911 | { | |
912 | struct bpacket *pkt; | |
913 | struct stream *s; | |
914 | struct bgp_adj_out *adj; | |
915 | struct bgp_advertise *adv; | |
8a92a8a0 | 916 | struct peer *peer; |
3f9c7369 DS |
917 | struct bgp_node *rn; |
918 | bgp_size_t unfeasible_len; | |
919 | bgp_size_t total_attr_len; | |
920 | size_t mp_start = 0; | |
921 | size_t attrlen_pos = 0; | |
922 | size_t mplen_pos = 0; | |
923 | u_char first_time = 1; | |
924 | afi_t afi; | |
925 | safi_t safi; | |
926 | int space_remaining = 0; | |
927 | int space_needed = 0; | |
928 | int num_pfx = 0; | |
adbac85e DW |
929 | int addpath_encode = 0; |
930 | u_int32_t addpath_tx_id = 0; | |
906ad49b | 931 | struct prefix_rd *prd = NULL; |
932 | ||
3f9c7369 DS |
933 | |
934 | if (!subgrp) | |
935 | return NULL; | |
936 | ||
937 | if (bpacket_queue_is_full (SUBGRP_INST (subgrp), SUBGRP_PKTQ (subgrp))) | |
938 | return NULL; | |
939 | ||
8a92a8a0 | 940 | peer = SUBGRP_PEER (subgrp); |
3f9c7369 DS |
941 | afi = SUBGRP_AFI (subgrp); |
942 | safi = SUBGRP_SAFI (subgrp); | |
943 | s = subgrp->work; | |
944 | stream_reset (s); | |
adbac85e | 945 | addpath_encode = bgp_addpath_encode_tx (peer, afi, safi); |
3f9c7369 DS |
946 | |
947 | while ((adv = BGP_ADV_FIFO_HEAD (&subgrp->sync->withdraw)) != NULL) | |
948 | { | |
949 | assert (adv->rn); | |
950 | adj = adv->adj; | |
951 | rn = adv->rn; | |
adbac85e | 952 | addpath_tx_id = adj->addpath_tx_id; |
3f9c7369 DS |
953 | |
954 | space_remaining = STREAM_REMAIN (s) - | |
955 | BGP_MAX_PACKET_SIZE_OVERFLOW; | |
6407da5a | 956 | space_needed = BGP_NLRI_LENGTH + BGP_TOTAL_ATTR_LEN + |
957 | bgp_packet_mpattr_prefix_size (afi, safi, &rn->p); | |
3f9c7369 DS |
958 | |
959 | if (space_remaining < space_needed) | |
960 | break; | |
961 | ||
962 | if (stream_empty (s)) | |
963 | { | |
964 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
965 | stream_putw (s, 0); /* unfeasible routes length */ | |
966 | } | |
967 | else | |
968 | first_time = 0; | |
969 | ||
8a92a8a0 | 970 | if (afi == AFI_IP && safi == SAFI_UNICAST && |
343e90c3 | 971 | !peer_cap_enhe(peer, afi, safi)) |
adbac85e | 972 | stream_put_prefix_addpath (s, &rn->p, addpath_encode, addpath_tx_id); |
3f9c7369 DS |
973 | else |
974 | { | |
3f9c7369 DS |
975 | if (rn->prn) |
976 | prd = (struct prefix_rd *) &rn->prn->p; | |
977 | ||
978 | /* If first time, format the MP_UNREACH header */ | |
979 | if (first_time) | |
980 | { | |
fe460659 | 981 | iana_afi_t pkt_afi; |
cceb79ac DS |
982 | safi_t pkt_safi; |
983 | ||
984 | pkt_afi = afi_int2iana (afi); | |
985 | pkt_safi = safi_int2iana (safi); | |
986 | ||
3f9c7369 DS |
987 | attrlen_pos = stream_get_endp (s); |
988 | /* total attr length = 0 for now. reevaluate later */ | |
989 | stream_putw (s, 0); | |
990 | mp_start = stream_get_endp (s); | |
991 | mplen_pos = bgp_packet_mpunreach_start (s, afi, safi); | |
cceb79ac DS |
992 | if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0)) |
993 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send MP_UNREACH for afi/safi %d/%d", | |
994 | subgrp->update_group->id, subgrp->id, pkt_afi, pkt_safi); | |
3f9c7369 DS |
995 | } |
996 | ||
adbac85e | 997 | bgp_packet_mpunreach_prefix (s, &rn->p, afi, safi, prd, NULL, |
b18825eb | 998 | addpath_encode, addpath_tx_id, NULL); |
3f9c7369 DS |
999 | } |
1000 | ||
1001 | num_pfx++; | |
1002 | ||
1003 | if (bgp_debug_update(NULL, &rn->p, subgrp->update_group, 0)) | |
1004 | { | |
906ad49b | 1005 | char pfx_buf[BGP_PRD_PATH_STRLEN]; |
1006 | ||
b16031a2 | 1007 | bgp_debug_rdpfxpath2str (afi, safi, prd, &rn->p, NULL, |
1008 | addpath_encode, addpath_tx_id, | |
1009 | pfx_buf, sizeof (pfx_buf)); | |
906ad49b | 1010 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE %s -- unreachable", |
b16031a2 | 1011 | subgrp->update_group->id, subgrp->id, pfx_buf); |
3f9c7369 DS |
1012 | } |
1013 | ||
1014 | subgrp->scount--; | |
1015 | ||
1016 | bgp_adj_out_remove_subgroup (rn, adj, subgrp); | |
1017 | bgp_unlock_node (rn); | |
1018 | } | |
1019 | ||
1020 | if (!stream_empty (s)) | |
1021 | { | |
8a92a8a0 | 1022 | if (afi == AFI_IP && safi == SAFI_UNICAST && |
343e90c3 | 1023 | !peer_cap_enhe(peer, afi, safi)) |
3f9c7369 DS |
1024 | { |
1025 | unfeasible_len | |
1026 | = stream_get_endp (s) - BGP_HEADER_SIZE - BGP_UNFEASIBLE_LEN; | |
1027 | stream_putw_at (s, BGP_HEADER_SIZE, unfeasible_len); | |
1028 | stream_putw (s, 0); | |
1029 | } | |
1030 | else | |
1031 | { | |
1032 | /* Set the mp_unreach attr's length */ | |
1033 | bgp_packet_mpunreach_end (s, mplen_pos); | |
1034 | ||
1035 | /* Set total path attribute length. */ | |
1036 | total_attr_len = stream_get_endp (s) - mp_start; | |
1037 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
1038 | } | |
1039 | bgp_packet_set_size (s); | |
1040 | if (bgp_debug_update(NULL, NULL, subgrp->update_group, 0)) | |
cceb79ac | 1041 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE (withdraw) len %zd numpfx %d", |
3f9c7369 DS |
1042 | subgrp->update_group->id, subgrp->id, |
1043 | (stream_get_endp(s) - stream_get_getp(s)), num_pfx); | |
1044 | pkt = bpacket_queue_add (SUBGRP_PKTQ (subgrp), stream_dup (s), NULL); | |
1045 | stream_reset (s); | |
1046 | return pkt; | |
1047 | } | |
1048 | ||
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | void | |
1053 | subgroup_default_update_packet (struct update_subgroup *subgrp, | |
1054 | struct attr *attr, struct peer *from) | |
1055 | { | |
1056 | struct stream *s; | |
3f9c7369 DS |
1057 | struct peer *peer; |
1058 | struct prefix p; | |
1059 | unsigned long pos; | |
1060 | bgp_size_t total_attr_len; | |
1061 | afi_t afi; | |
1062 | safi_t safi; | |
1063 | struct bpacket_attr_vec_arr vecarr; | |
adbac85e | 1064 | int addpath_encode = 0; |
3f9c7369 DS |
1065 | |
1066 | if (DISABLE_BGP_ANNOUNCE) | |
1067 | return; | |
1068 | ||
1069 | if (!subgrp) | |
1070 | return; | |
1071 | ||
1072 | peer = SUBGRP_PEER (subgrp); | |
1073 | afi = SUBGRP_AFI (subgrp); | |
1074 | safi = SUBGRP_SAFI (subgrp); | |
1075 | bpacket_attr_vec_arr_reset (&vecarr); | |
adbac85e | 1076 | addpath_encode = bgp_addpath_encode_tx (peer, afi, safi); |
3f9c7369 DS |
1077 | |
1078 | if (afi == AFI_IP) | |
1079 | str2prefix ("0.0.0.0/0", &p); | |
3f9c7369 DS |
1080 | else |
1081 | str2prefix ("::/0", &p); | |
3f9c7369 DS |
1082 | |
1083 | /* Logging the attribute. */ | |
1084 | if (bgp_debug_update(NULL, &p, subgrp->update_group, 0)) | |
1085 | { | |
1086 | char attrstr[BUFSIZ]; | |
906ad49b | 1087 | char buf[PREFIX_STRLEN]; |
c7fb1838 QY |
1088 | /* ' with addpath ID ' 17 |
1089 | * max strlen of uint32 + 10 | |
1090 | * +/- (just in case) + 1 | |
1091 | * null terminator + 1 | |
1092 | * ============================ 29 */ | |
adbac85e | 1093 | char tx_id_buf[30]; |
c7fb1838 | 1094 | |
3f9c7369 DS |
1095 | attrstr[0] = '\0'; |
1096 | ||
9ff63e6f | 1097 | bgp_dump_attr (attr, attrstr, BUFSIZ); |
c7fb1838 QY |
1098 | |
1099 | if (addpath_encode) | |
1100 | snprintf(tx_id_buf, sizeof (tx_id_buf), " with addpath ID %u", | |
1101 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
1102 | ||
906ad49b | 1103 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE %s%s %s", |
adbac85e | 1104 | (SUBGRP_UPDGRP (subgrp))->id, subgrp->id, |
906ad49b | 1105 | prefix2str (&p, buf, sizeof (buf)), |
1106 | tx_id_buf, attrstr); | |
3f9c7369 DS |
1107 | } |
1108 | ||
1109 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
1110 | ||
1111 | /* Make BGP update packet. */ | |
1112 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
1113 | ||
1114 | /* Unfeasible Routes Length. */ | |
1115 | stream_putw (s, 0); | |
1116 | ||
1117 | /* Make place for total attribute length. */ | |
1118 | pos = stream_get_endp (s); | |
1119 | stream_putw (s, 0); | |
1120 | total_attr_len = bgp_packet_attribute (NULL, peer, s, attr, &vecarr, &p, | |
adbac85e DW |
1121 | afi, safi, from, NULL, NULL, |
1122 | addpath_encode, | |
1123 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
3f9c7369 DS |
1124 | |
1125 | /* Set Total Path Attribute Length. */ | |
1126 | stream_putw_at (s, pos, total_attr_len); | |
1127 | ||
1128 | /* NLRI set. */ | |
8a92a8a0 | 1129 | if (p.family == AF_INET && safi == SAFI_UNICAST && |
343e90c3 | 1130 | !peer_cap_enhe(peer, afi, safi)) |
adbac85e | 1131 | stream_put_prefix_addpath (s, &p, addpath_encode, BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); |
3f9c7369 DS |
1132 | |
1133 | /* Set size. */ | |
1134 | bgp_packet_set_size (s); | |
1135 | ||
af4b20d2 | 1136 | (void) bpacket_queue_add (SUBGRP_PKTQ (subgrp), s, &vecarr); |
3f9c7369 DS |
1137 | subgroup_trigger_write(subgrp); |
1138 | } | |
1139 | ||
1140 | void | |
1141 | subgroup_default_withdraw_packet (struct update_subgroup *subgrp) | |
1142 | { | |
8a92a8a0 | 1143 | struct peer *peer; |
3f9c7369 | 1144 | struct stream *s; |
3f9c7369 DS |
1145 | struct prefix p; |
1146 | unsigned long attrlen_pos = 0; | |
1147 | unsigned long cp; | |
1148 | bgp_size_t unfeasible_len; | |
18f1dc06 | 1149 | bgp_size_t total_attr_len = 0; |
3f9c7369 DS |
1150 | size_t mp_start = 0; |
1151 | size_t mplen_pos = 0; | |
1152 | afi_t afi; | |
1153 | safi_t safi; | |
adbac85e | 1154 | int addpath_encode = 0; |
3f9c7369 DS |
1155 | |
1156 | if (DISABLE_BGP_ANNOUNCE) | |
1157 | return; | |
1158 | ||
8a92a8a0 | 1159 | peer = SUBGRP_PEER (subgrp); |
3f9c7369 DS |
1160 | afi = SUBGRP_AFI (subgrp); |
1161 | safi = SUBGRP_SAFI (subgrp); | |
adbac85e | 1162 | addpath_encode = bgp_addpath_encode_tx (peer, afi, safi); |
3f9c7369 DS |
1163 | |
1164 | if (afi == AFI_IP) | |
1165 | str2prefix ("0.0.0.0/0", &p); | |
3f9c7369 DS |
1166 | else |
1167 | str2prefix ("::/0", &p); | |
3f9c7369 | 1168 | |
3f9c7369 DS |
1169 | if (bgp_debug_update(NULL, &p, subgrp->update_group, 0)) |
1170 | { | |
906ad49b | 1171 | char buf[PREFIX_STRLEN]; |
c7fb1838 QY |
1172 | /* ' with addpath ID ' 17 |
1173 | * max strlen of uint32 + 10 | |
1174 | * +/- (just in case) + 1 | |
1175 | * null terminator + 1 | |
1176 | * ============================ 29 */ | |
1177 | char tx_id_buf[30]; | |
1178 | ||
1179 | if (addpath_encode) | |
1180 | snprintf(tx_id_buf, sizeof (tx_id_buf), " with addpath ID %u", | |
1181 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
3f9c7369 | 1182 | |
906ad49b | 1183 | zlog_debug ("u%" PRIu64 ":s%" PRIu64 " send UPDATE %s%s -- unreachable", |
adbac85e | 1184 | (SUBGRP_UPDGRP (subgrp))->id, subgrp->id, |
906ad49b | 1185 | prefix2str (&p, buf, sizeof (buf)), tx_id_buf); |
3f9c7369 DS |
1186 | } |
1187 | ||
1188 | s = stream_new (BGP_MAX_PACKET_SIZE); | |
1189 | ||
1190 | /* Make BGP update packet. */ | |
1191 | bgp_packet_set_marker (s, BGP_MSG_UPDATE); | |
1192 | ||
1193 | /* Unfeasible Routes Length. */ ; | |
1194 | cp = stream_get_endp (s); | |
1195 | stream_putw (s, 0); | |
1196 | ||
1197 | /* Withdrawn Routes. */ | |
8a92a8a0 | 1198 | if (p.family == AF_INET && safi == SAFI_UNICAST && |
343e90c3 | 1199 | !peer_cap_enhe(peer, afi, safi)) |
3f9c7369 | 1200 | { |
adbac85e DW |
1201 | stream_put_prefix_addpath (s, &p, addpath_encode, |
1202 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE); | |
3f9c7369 DS |
1203 | |
1204 | unfeasible_len = stream_get_endp (s) - cp - 2; | |
1205 | ||
1206 | /* Set unfeasible len. */ | |
1207 | stream_putw_at (s, cp, unfeasible_len); | |
1208 | ||
1209 | /* Set total path attribute length. */ | |
1210 | stream_putw (s, 0); | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | attrlen_pos = stream_get_endp (s); | |
1215 | stream_putw (s, 0); | |
1216 | mp_start = stream_get_endp (s); | |
1217 | mplen_pos = bgp_packet_mpunreach_start (s, afi, safi); | |
adbac85e DW |
1218 | bgp_packet_mpunreach_prefix (s, &p, afi, safi, NULL, NULL, |
1219 | addpath_encode, | |
b18825eb | 1220 | BGP_ADDPATH_TX_ID_FOR_DEFAULT_ORIGINATE, NULL); |
3f9c7369 DS |
1221 | |
1222 | /* Set the mp_unreach attr's length */ | |
1223 | bgp_packet_mpunreach_end (s, mplen_pos); | |
1224 | ||
1225 | /* Set total path attribute length. */ | |
1226 | total_attr_len = stream_get_endp (s) - mp_start; | |
1227 | stream_putw_at (s, attrlen_pos, total_attr_len); | |
1228 | } | |
1229 | ||
1230 | bgp_packet_set_size (s); | |
1231 | ||
af4b20d2 | 1232 | (void) bpacket_queue_add (SUBGRP_PKTQ (subgrp), s, NULL); |
3f9c7369 DS |
1233 | subgroup_trigger_write(subgrp); |
1234 | } | |
1235 | ||
1236 | static void | |
1237 | bpacket_vec_arr_inherit_attr_flags (struct bpacket_attr_vec_arr *vecarr, | |
1238 | bpacket_attr_vec_type type, | |
1239 | struct attr *attr) | |
1240 | { | |
1241 | if (CHECK_FLAG (attr->rmap_change_flags, | |
3811f1e2 DS |
1242 | BATTR_RMAP_NEXTHOP_PEER_ADDRESS)) |
1243 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1244 | BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS); | |
1245 | ||
1246 | if (CHECK_FLAG (attr->rmap_change_flags, BATTR_REFLECTED)) | |
1247 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, | |
1248 | BPKT_ATTRVEC_FLAGS_REFLECTED); | |
1249 | ||
1250 | if (CHECK_FLAG (attr->rmap_change_flags, | |
1251 | BATTR_RMAP_NEXTHOP_UNCHANGED)) | |
3f9c7369 | 1252 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, |
3811f1e2 | 1253 | BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED); |
3f9c7369 DS |
1254 | |
1255 | if (CHECK_FLAG (attr->rmap_change_flags, | |
3811f1e2 | 1256 | BATTR_RMAP_IPV4_NHOP_CHANGED)) |
3f9c7369 | 1257 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, |
3811f1e2 | 1258 | BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED); |
3f9c7369 | 1259 | |
3811f1e2 DS |
1260 | if (CHECK_FLAG (attr->rmap_change_flags, |
1261 | BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED)) | |
3f9c7369 | 1262 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, |
3811f1e2 | 1263 | BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED); |
316e074d DS |
1264 | |
1265 | if (CHECK_FLAG (attr->rmap_change_flags, | |
3811f1e2 | 1266 | BATTR_RMAP_IPV6_LL_NHOP_CHANGED)) |
316e074d | 1267 | SET_FLAG (vecarr->entries[BGP_ATTR_VEC_NH].flags, |
3811f1e2 | 1268 | BPKT_ATTRVEC_FLAGS_RMAP_IPV6_LNH_CHANGED); |
3f9c7369 DS |
1269 | } |
1270 | ||
1271 | /* Reset the Attributes vector array. The vector array is used to override | |
1272 | * certain output parameters in the packet for a particular peer | |
1273 | */ | |
1274 | void | |
1275 | bpacket_attr_vec_arr_reset (struct bpacket_attr_vec_arr *vecarr) | |
1276 | { | |
1277 | int i; | |
1278 | ||
1279 | if (!vecarr) | |
1280 | return; | |
1281 | ||
1282 | i = 0; | |
1283 | while (i < BGP_ATTR_VEC_MAX) | |
1284 | { | |
1285 | vecarr->entries[i].flags = 0; | |
1286 | vecarr->entries[i].offset = 0; | |
1287 | i++; | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | /* Setup a particular node entry in the vecarr */ | |
1292 | void | |
1293 | bpacket_attr_vec_arr_set_vec (struct bpacket_attr_vec_arr *vecarr, | |
1294 | bpacket_attr_vec_type type, struct stream *s, | |
1295 | struct attr *attr) | |
1296 | { | |
1297 | if (!vecarr) | |
1298 | return; | |
1299 | assert (type < BGP_ATTR_VEC_MAX); | |
1300 | ||
3811f1e2 | 1301 | SET_FLAG (vecarr->entries[type].flags, BPKT_ATTRVEC_FLAGS_UPDATED); |
3f9c7369 DS |
1302 | vecarr->entries[type].offset = stream_get_endp (s); |
1303 | if (attr) | |
1304 | bpacket_vec_arr_inherit_attr_flags(vecarr, type, attr); | |
1305 | } |