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718e3744 | 1 | /* BGP attributes management routines. |
2 | Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro | |
3 | ||
4 | This file is part of GNU Zebra. | |
5 | ||
6 | GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) any | |
9 | later version. | |
10 | ||
11 | GNU Zebra is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
27 | #include "vty.h" | |
28 | #include "stream.h" | |
29 | #include "log.h" | |
30 | #include "hash.h" | |
c8e7b895 | 31 | #include "jhash.h" |
3f9c7369 | 32 | #include "queue.h" |
f4c89855 | 33 | #include "table.h" |
039f3a34 | 34 | #include "filter.h" |
4dcadbef | 35 | #include "command.h" |
718e3744 | 36 | |
37 | #include "bgpd/bgpd.h" | |
38 | #include "bgpd/bgp_attr.h" | |
39 | #include "bgpd/bgp_route.h" | |
40 | #include "bgpd/bgp_aspath.h" | |
41 | #include "bgpd/bgp_community.h" | |
42 | #include "bgpd/bgp_debug.h" | |
43 | #include "bgpd/bgp_packet.h" | |
44 | #include "bgpd/bgp_ecommunity.h" | |
3f9c7369 | 45 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 46 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 47 | #if ENABLE_BGP_VNC |
f8b6f499 | 48 | # include "bgpd/rfapi/bgp_rfapi_cfg.h" |
65efcfce LB |
49 | # include "bgp_encap_types.h" |
50 | # include "bgp_vnc_types.h" | |
51 | #endif | |
6b0655a2 | 52 | |
718e3744 | 53 | /* Attribute strings for logging. */ |
9bddac4b | 54 | static const struct message attr_str [] = |
718e3744 | 55 | { |
56 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
57 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
58 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
59 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
60 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
61 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
62 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
63 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
64 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
f8627ff1 | 65 | { BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST" }, |
718e3744 | 66 | { BGP_ATTR_DPA, "DPA" }, |
67 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
68 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
69 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
70 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
0b2aa3a0 PJ |
71 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
72 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
73 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
74 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
f4c89855 | 75 | { BGP_ATTR_ENCAP, "ENCAP" }, |
65efcfce LB |
76 | #if ENABLE_BGP_VNC |
77 | { BGP_ATTR_VNC, "VNC" }, | |
78 | #endif | |
718e3744 | 79 | }; |
837d16cc | 80 | static const int attr_str_max = array_size(attr_str); |
afcb7679 DO |
81 | |
82 | static const struct message attr_flag_str[] = | |
83 | { | |
84 | { BGP_ATTR_FLAG_OPTIONAL, "Optional" }, | |
85 | { BGP_ATTR_FLAG_TRANS, "Transitive" }, | |
86 | { BGP_ATTR_FLAG_PARTIAL, "Partial" }, | |
87 | /* bgp_attr_flags_diagnose() relies on this bit being last in this list */ | |
88 | { BGP_ATTR_FLAG_EXTLEN, "Extended Length" }, | |
89 | }; | |
6b0655a2 | 90 | |
9bddac4b | 91 | static struct hash *cluster_hash; |
718e3744 | 92 | |
94f2b392 | 93 | static void * |
923de654 | 94 | cluster_hash_alloc (void *p) |
718e3744 | 95 | { |
ffd0c037 | 96 | const struct cluster_list *val = (const struct cluster_list *) p; |
718e3744 | 97 | struct cluster_list *cluster; |
98 | ||
99 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
100 | cluster->length = val->length; | |
101 | ||
102 | if (cluster->length) | |
103 | { | |
104 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
105 | memcpy (cluster->list, val->list, val->length); | |
106 | } | |
107 | else | |
108 | cluster->list = NULL; | |
109 | ||
110 | cluster->refcnt = 0; | |
111 | ||
112 | return cluster; | |
113 | } | |
114 | ||
115 | /* Cluster list related functions. */ | |
94f2b392 | 116 | static struct cluster_list * |
5228ad27 | 117 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 118 | { |
119 | struct cluster_list tmp; | |
120 | struct cluster_list *cluster; | |
121 | ||
122 | tmp.length = length; | |
5228ad27 | 123 | tmp.list = pnt; |
718e3744 | 124 | |
125 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
126 | cluster->refcnt++; | |
127 | return cluster; | |
128 | } | |
129 | ||
130 | int | |
131 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
132 | { | |
133 | int i; | |
134 | ||
135 | for (i = 0; i < cluster->length / 4; i++) | |
136 | if (cluster->list[i].s_addr == originator.s_addr) | |
137 | return 1; | |
138 | return 0; | |
139 | } | |
140 | ||
94f2b392 | 141 | static unsigned int |
923de654 | 142 | cluster_hash_key_make (void *p) |
718e3744 | 143 | { |
c8e7b895 | 144 | const struct cluster_list *cluster = p; |
718e3744 | 145 | |
c8e7b895 | 146 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 147 | } |
148 | ||
94f2b392 | 149 | static int |
ffe11cfb | 150 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 151 | { |
ffe11cfb SH |
152 | const struct cluster_list * cluster1 = p1; |
153 | const struct cluster_list * cluster2 = p2; | |
923de654 | 154 | |
ffe11cfb SH |
155 | return (cluster1->length == cluster2->length && |
156 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 157 | } |
158 | ||
94f2b392 | 159 | static void |
718e3744 | 160 | cluster_free (struct cluster_list *cluster) |
161 | { | |
162 | if (cluster->list) | |
163 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
164 | XFREE (MTYPE_CLUSTER, cluster); | |
165 | } | |
166 | ||
94f2b392 | 167 | static struct cluster_list * |
718e3744 | 168 | cluster_dup (struct cluster_list *cluster) |
169 | { | |
170 | struct cluster_list *new; | |
171 | ||
393deb9b | 172 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 173 | new->length = cluster->length; |
174 | ||
175 | if (cluster->length) | |
176 | { | |
177 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
178 | memcpy (new->list, cluster->list, cluster->length); | |
179 | } | |
180 | else | |
181 | new->list = NULL; | |
182 | ||
183 | return new; | |
184 | } | |
185 | ||
94f2b392 | 186 | static struct cluster_list * |
718e3744 | 187 | cluster_intern (struct cluster_list *cluster) |
188 | { | |
189 | struct cluster_list *find; | |
190 | ||
191 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
192 | find->refcnt++; | |
193 | ||
194 | return find; | |
195 | } | |
196 | ||
197 | void | |
198 | cluster_unintern (struct cluster_list *cluster) | |
199 | { | |
718e3744 | 200 | if (cluster->refcnt) |
201 | cluster->refcnt--; | |
202 | ||
203 | if (cluster->refcnt == 0) | |
204 | { | |
9206f9ec | 205 | hash_release (cluster_hash, cluster); |
718e3744 | 206 | cluster_free (cluster); |
207 | } | |
208 | } | |
209 | ||
94f2b392 | 210 | static void |
211 | cluster_init (void) | |
718e3744 | 212 | { |
213 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
214 | } | |
228da428 CC |
215 | |
216 | static void | |
217 | cluster_finish (void) | |
218 | { | |
289d2501 | 219 | hash_clean (cluster_hash, (void (*)(void *))cluster_free); |
228da428 CC |
220 | hash_free (cluster_hash); |
221 | cluster_hash = NULL; | |
222 | } | |
6b0655a2 | 223 | |
bede7744 LB |
224 | static struct hash *encap_hash = NULL; |
225 | #if ENABLE_BGP_VNC | |
226 | static struct hash *vnc_hash = NULL; | |
227 | #endif | |
228 | ||
f4c89855 LB |
229 | struct bgp_attr_encap_subtlv * |
230 | encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) | |
231 | { | |
232 | struct bgp_attr_encap_subtlv *new; | |
233 | struct bgp_attr_encap_subtlv *tail; | |
234 | struct bgp_attr_encap_subtlv *p; | |
235 | ||
236 | for (p = orig, tail = new = NULL; p; p = p->next) { | |
237 | int size = sizeof(struct bgp_attr_encap_subtlv) - 1 + p->length; | |
238 | if (tail) { | |
239 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
240 | tail = tail->next; | |
241 | } else { | |
242 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
243 | } | |
244 | assert(tail); | |
245 | memcpy(tail, p, size); | |
246 | tail->next = NULL; | |
247 | } | |
248 | ||
249 | return new; | |
250 | } | |
251 | ||
252 | static void | |
253 | encap_free(struct bgp_attr_encap_subtlv *p) | |
254 | { | |
255 | struct bgp_attr_encap_subtlv *next; | |
256 | while (p) { | |
257 | next = p->next; | |
258 | p->next = NULL; | |
259 | XFREE(MTYPE_ENCAP_TLV, p); | |
260 | p = next; | |
261 | } | |
262 | } | |
263 | ||
264 | void | |
265 | bgp_attr_flush_encap(struct attr *attr) | |
266 | { | |
267 | if (!attr || !attr->extra) | |
268 | return; | |
269 | ||
270 | if (attr->extra->encap_subtlvs) { | |
271 | encap_free(attr->extra->encap_subtlvs); | |
272 | attr->extra->encap_subtlvs = NULL; | |
273 | } | |
65efcfce LB |
274 | #if ENABLE_BGP_VNC |
275 | if (attr->extra->vnc_subtlvs) { | |
276 | encap_free(attr->extra->vnc_subtlvs); | |
277 | attr->extra->vnc_subtlvs = NULL; | |
278 | } | |
279 | #endif | |
f4c89855 LB |
280 | } |
281 | ||
282 | /* | |
283 | * Compare encap sub-tlv chains | |
284 | * | |
285 | * 1 = equivalent | |
286 | * 0 = not equivalent | |
287 | * | |
288 | * This algorithm could be made faster if needed | |
289 | */ | |
290 | static int | |
291 | encap_same(struct bgp_attr_encap_subtlv *h1, struct bgp_attr_encap_subtlv *h2) | |
292 | { | |
293 | struct bgp_attr_encap_subtlv *p; | |
294 | struct bgp_attr_encap_subtlv *q; | |
295 | ||
f4c89855 LB |
296 | if (h1 == h2) |
297 | return 1; | |
bede7744 LB |
298 | if (h1 == NULL || h2 == NULL) |
299 | return 0; | |
f4c89855 LB |
300 | |
301 | for (p = h1; p; p = p->next) { | |
302 | for (q = h2; q; q = q->next) { | |
303 | if ((p->type == q->type) && | |
304 | (p->length == q->length) && | |
305 | !memcmp(p->value, q->value, p->length)) { | |
306 | ||
307 | break; | |
308 | } | |
309 | } | |
310 | if (!q) | |
311 | return 0; | |
312 | } | |
313 | ||
314 | for (p = h2; p; p = p->next) { | |
315 | for (q = h1; q; q = q->next) { | |
316 | if ((p->type == q->type) && | |
317 | (p->length == q->length) && | |
318 | !memcmp(p->value, q->value, p->length)) { | |
319 | ||
320 | break; | |
321 | } | |
322 | } | |
323 | if (!q) | |
324 | return 0; | |
325 | } | |
326 | ||
327 | return 1; | |
328 | } | |
329 | ||
bede7744 LB |
330 | static void * |
331 | encap_hash_alloc (void *p) | |
332 | { | |
333 | /* Encap structure is already allocated. */ | |
334 | return p; | |
335 | } | |
336 | ||
337 | typedef enum | |
338 | { | |
339 | ENCAP_SUBTLV_TYPE, | |
340 | #if ENABLE_BGP_VNC | |
341 | VNC_SUBTLV_TYPE | |
342 | #endif | |
343 | } encap_subtlv_type; | |
344 | ||
345 | static struct bgp_attr_encap_subtlv * | |
346 | encap_intern (struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) | |
347 | { | |
348 | struct bgp_attr_encap_subtlv *find; | |
349 | struct hash *hash = encap_hash; | |
350 | #if ENABLE_BGP_VNC | |
351 | if (type == VNC_SUBTLV_TYPE) | |
352 | hash = vnc_hash; | |
353 | #endif | |
354 | ||
355 | find = hash_get (hash, encap, encap_hash_alloc); | |
356 | if (find != encap) | |
357 | encap_free (encap); | |
358 | find->refcnt++; | |
359 | ||
360 | return find; | |
361 | } | |
362 | ||
363 | static void | |
364 | encap_unintern (struct bgp_attr_encap_subtlv **encapp, encap_subtlv_type type) | |
365 | { | |
366 | struct bgp_attr_encap_subtlv *encap = *encapp; | |
367 | if (encap->refcnt) | |
368 | encap->refcnt--; | |
369 | ||
370 | if (encap->refcnt == 0) | |
371 | { | |
372 | struct hash *hash = encap_hash; | |
373 | #if ENABLE_BGP_VNC | |
374 | if (type == VNC_SUBTLV_TYPE) | |
375 | hash = vnc_hash; | |
376 | #endif | |
377 | hash_release (hash, encap); | |
378 | encap_free (encap); | |
379 | *encapp = NULL; | |
380 | } | |
381 | } | |
382 | ||
383 | static unsigned int | |
384 | encap_hash_key_make (void *p) | |
385 | { | |
386 | const struct bgp_attr_encap_subtlv * encap = p; | |
387 | ||
388 | return jhash(encap->value, encap->length, 0); | |
389 | } | |
390 | ||
391 | static int | |
392 | encap_hash_cmp (const void *p1, const void *p2) | |
393 | { | |
394 | return encap_same((struct bgp_attr_encap_subtlv *)p1, | |
395 | (struct bgp_attr_encap_subtlv *)p2); | |
396 | } | |
397 | ||
398 | static void | |
399 | encap_init (void) | |
400 | { | |
401 | encap_hash = hash_create (encap_hash_key_make, encap_hash_cmp); | |
402 | #if ENABLE_BGP_VNC | |
403 | vnc_hash = hash_create (encap_hash_key_make, encap_hash_cmp); | |
404 | #endif | |
405 | } | |
406 | ||
407 | static void | |
408 | encap_finish (void) | |
409 | { | |
410 | hash_clean (encap_hash, (void (*)(void *))encap_free); | |
411 | hash_free (encap_hash); | |
412 | encap_hash = NULL; | |
413 | #if ENABLE_BGP_VNC | |
414 | hash_clean (vnc_hash, (void (*)(void *))encap_free); | |
415 | hash_free (vnc_hash); | |
416 | vnc_hash = NULL; | |
417 | #endif | |
418 | } | |
419 | ||
718e3744 | 420 | /* Unknown transit attribute. */ |
9bddac4b | 421 | static struct hash *transit_hash; |
718e3744 | 422 | |
94f2b392 | 423 | static void |
718e3744 | 424 | transit_free (struct transit *transit) |
425 | { | |
426 | if (transit->val) | |
427 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
428 | XFREE (MTYPE_TRANSIT, transit); | |
429 | } | |
430 | ||
73ac8160 DS |
431 | static struct transit * |
432 | transit_dup (struct transit *transit) | |
433 | { | |
434 | struct transit *new; | |
435 | ||
436 | new = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
437 | new->length = transit->length; | |
438 | if (new->length) | |
439 | { | |
440 | new->val = XMALLOC (MTYPE_TRANSIT_VAL, transit->length); | |
441 | memcpy (new->val, transit->val, transit->length); | |
442 | } | |
443 | else | |
444 | new->val = NULL; | |
445 | ||
446 | return new; | |
447 | } | |
923de654 | 448 | |
94f2b392 | 449 | static void * |
923de654 | 450 | transit_hash_alloc (void *p) |
718e3744 | 451 | { |
452 | /* Transit structure is already allocated. */ | |
923de654 | 453 | return p; |
718e3744 | 454 | } |
455 | ||
94f2b392 | 456 | static struct transit * |
718e3744 | 457 | transit_intern (struct transit *transit) |
458 | { | |
459 | struct transit *find; | |
460 | ||
461 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
462 | if (find != transit) | |
463 | transit_free (transit); | |
464 | find->refcnt++; | |
465 | ||
466 | return find; | |
467 | } | |
468 | ||
469 | void | |
470 | transit_unintern (struct transit *transit) | |
471 | { | |
718e3744 | 472 | if (transit->refcnt) |
473 | transit->refcnt--; | |
474 | ||
475 | if (transit->refcnt == 0) | |
476 | { | |
9206f9ec | 477 | hash_release (transit_hash, transit); |
718e3744 | 478 | transit_free (transit); |
479 | } | |
480 | } | |
481 | ||
94f2b392 | 482 | static unsigned int |
923de654 | 483 | transit_hash_key_make (void *p) |
718e3744 | 484 | { |
c8e7b895 | 485 | const struct transit * transit = p; |
718e3744 | 486 | |
c8e7b895 | 487 | return jhash(transit->val, transit->length, 0); |
718e3744 | 488 | } |
489 | ||
94f2b392 | 490 | static int |
ffe11cfb | 491 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 492 | { |
ffe11cfb SH |
493 | const struct transit * transit1 = p1; |
494 | const struct transit * transit2 = p2; | |
923de654 | 495 | |
ffe11cfb SH |
496 | return (transit1->length == transit2->length && |
497 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 498 | } |
499 | ||
94f2b392 | 500 | static void |
66e5cd87 | 501 | transit_init (void) |
718e3744 | 502 | { |
503 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
504 | } | |
228da428 CC |
505 | |
506 | static void | |
507 | transit_finish (void) | |
508 | { | |
289d2501 | 509 | hash_clean (transit_hash, (void (*)(void *))transit_free); |
228da428 CC |
510 | hash_free (transit_hash); |
511 | transit_hash = NULL; | |
512 | } | |
6b0655a2 | 513 | |
718e3744 | 514 | /* Attribute hash routines. */ |
9bddac4b | 515 | static struct hash *attrhash; |
718e3744 | 516 | |
fb982c25 PJ |
517 | static struct attr_extra * |
518 | bgp_attr_extra_new (void) | |
519 | { | |
520 | return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra)); | |
521 | } | |
522 | ||
523 | void | |
524 | bgp_attr_extra_free (struct attr *attr) | |
525 | { | |
526 | if (attr->extra) | |
527 | { | |
528 | XFREE (MTYPE_ATTR_EXTRA, attr->extra); | |
529 | attr->extra = NULL; | |
530 | } | |
531 | } | |
532 | ||
533 | struct attr_extra * | |
534 | bgp_attr_extra_get (struct attr *attr) | |
535 | { | |
536 | if (!attr->extra) | |
537 | attr->extra = bgp_attr_extra_new(); | |
538 | return attr->extra; | |
539 | } | |
540 | ||
541 | /* Shallow copy of an attribute | |
542 | * Though, not so shallow that it doesn't copy the contents | |
543 | * of the attr_extra pointed to by 'extra' | |
544 | */ | |
545 | void | |
546 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
547 | { | |
558d1fec JBD |
548 | struct attr_extra *extra = new->extra; |
549 | ||
fb982c25 | 550 | *new = *orig; |
a0de1d16 CF |
551 | /* if caller provided attr_extra space, use it in any case. |
552 | * | |
553 | * This is neccesary even if orig->extra equals NULL, because otherwise | |
554 | * memory may be later allocated on the heap by bgp_attr_extra_get. | |
555 | * | |
556 | * That memory would eventually be leaked, because the caller must not | |
557 | * call bgp_attr_extra_free if he provided attr_extra on the stack. | |
558 | */ | |
559 | if (extra) | |
560 | { | |
561 | new->extra = extra; | |
562 | memset(new->extra, 0, sizeof(struct attr_extra)); | |
f4c89855 | 563 | if (orig->extra) { |
a0de1d16 | 564 | *new->extra = *orig->extra; |
f4c89855 | 565 | } |
a0de1d16 CF |
566 | } |
567 | else if (orig->extra) | |
fb982c25 | 568 | { |
a0de1d16 | 569 | new->extra = bgp_attr_extra_new(); |
fb982c25 PJ |
570 | *new->extra = *orig->extra; |
571 | } | |
572 | } | |
573 | ||
73ac8160 DS |
574 | void |
575 | bgp_attr_deep_dup (struct attr *new, struct attr *orig) | |
576 | { | |
577 | if (orig->aspath) | |
578 | new->aspath = aspath_dup(orig->aspath); | |
579 | ||
580 | if (orig->community) | |
581 | new->community = community_dup(orig->community); | |
582 | ||
583 | if (orig->extra) | |
584 | { | |
585 | if (orig->extra->ecommunity) | |
586 | new->extra->ecommunity = ecommunity_dup(orig->extra->ecommunity); | |
587 | if (orig->extra->cluster) | |
588 | new->extra->cluster = cluster_dup(orig->extra->cluster); | |
589 | if (orig->extra->transit) | |
590 | new->extra->transit = transit_dup(orig->extra->transit); | |
bede7744 LB |
591 | if (orig->extra->encap_subtlvs) |
592 | new->extra->encap_subtlvs = encap_tlv_dup(orig->extra->encap_subtlvs); | |
593 | #if ENABLE_BGP_VNC | |
594 | if (orig->extra->vnc_subtlvs) | |
595 | new->extra->vnc_subtlvs = encap_tlv_dup(orig->extra->vnc_subtlvs); | |
596 | #endif | |
73ac8160 DS |
597 | } |
598 | } | |
599 | ||
600 | void | |
601 | bgp_attr_deep_free (struct attr *attr) | |
602 | { | |
603 | if (attr->aspath) | |
604 | aspath_free(attr->aspath); | |
605 | ||
606 | if (attr->community) | |
607 | community_free(attr->community); | |
608 | ||
609 | if (attr->extra) | |
610 | { | |
611 | if (attr->extra->ecommunity) | |
612 | ecommunity_free(&attr->extra->ecommunity); | |
613 | if (attr->extra->cluster) | |
614 | cluster_free(attr->extra->cluster); | |
615 | if (attr->extra->transit) | |
616 | transit_free(attr->extra->transit); | |
bede7744 LB |
617 | if (attr->extra->encap_subtlvs) |
618 | encap_free(attr->extra->encap_subtlvs); | |
619 | #if ENABLE_BGP_VNC | |
620 | if (attr->extra->vnc_subtlvs) | |
621 | encap_free(attr->extra->vnc_subtlvs); | |
622 | #endif | |
73ac8160 DS |
623 | } |
624 | } | |
625 | ||
cbdfbaa5 PJ |
626 | unsigned long int |
627 | attr_count (void) | |
628 | { | |
629 | return attrhash->count; | |
630 | } | |
631 | ||
632 | unsigned long int | |
633 | attr_unknown_count (void) | |
634 | { | |
635 | return transit_hash->count; | |
636 | } | |
637 | ||
718e3744 | 638 | unsigned int |
923de654 | 639 | attrhash_key_make (void *p) |
718e3744 | 640 | { |
7fb0cd82 JBD |
641 | const struct attr *attr = (struct attr *) p; |
642 | const struct attr_extra *extra = attr->extra; | |
c8e7b895 SH |
643 | uint32_t key = 0; |
644 | #define MIX(val) key = jhash_1word(val, key) | |
645 | ||
646 | MIX(attr->origin); | |
647 | MIX(attr->nexthop.s_addr); | |
648 | MIX(attr->med); | |
649 | MIX(attr->local_pref); | |
718e3744 | 650 | |
c8f3fe30 PJ |
651 | key += attr->origin; |
652 | key += attr->nexthop.s_addr; | |
653 | key += attr->med; | |
654 | key += attr->local_pref; | |
fb982c25 | 655 | |
7fb0cd82 | 656 | if (extra) |
fb982c25 | 657 | { |
7fb0cd82 JBD |
658 | MIX(extra->aggregator_as); |
659 | MIX(extra->aggregator_addr.s_addr); | |
660 | MIX(extra->weight); | |
661 | MIX(extra->mp_nexthop_global_in.s_addr); | |
689bb66c | 662 | MIX(extra->originator_id.s_addr); |
0d9551dc | 663 | MIX(extra->tag); |
fb982c25 PJ |
664 | } |
665 | ||
718e3744 | 666 | if (attr->aspath) |
c8e7b895 | 667 | MIX(aspath_key_make (attr->aspath)); |
718e3744 | 668 | if (attr->community) |
c8e7b895 | 669 | MIX(community_hash_make (attr->community)); |
fb982c25 | 670 | |
7fb0cd82 | 671 | if (extra) |
fb982c25 | 672 | { |
7fb0cd82 JBD |
673 | if (extra->ecommunity) |
674 | MIX(ecommunity_hash_make (extra->ecommunity)); | |
675 | if (extra->cluster) | |
676 | MIX(cluster_hash_key_make (extra->cluster)); | |
677 | if (extra->transit) | |
678 | MIX(transit_hash_key_make (extra->transit)); | |
bede7744 LB |
679 | if (extra->encap_subtlvs) |
680 | MIX(encap_hash_key_make (extra->encap_subtlvs)); | |
681 | #if ENABLE_BGP_VNC | |
682 | if (extra->vnc_subtlvs) | |
683 | MIX(encap_hash_key_make (extra->vnc_subtlvs)); | |
684 | #endif | |
718e3744 | 685 | #ifdef HAVE_IPV6 |
7fb0cd82 | 686 | MIX(extra->mp_nexthop_len); |
801a9bcc DS |
687 | key = jhash(extra->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); |
688 | key = jhash(extra->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
718e3744 | 689 | #endif /* HAVE_IPV6 */ |
fb982c25 | 690 | } |
718e3744 | 691 | |
692 | return key; | |
693 | } | |
694 | ||
695 | int | |
ffe11cfb | 696 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 697 | { |
ffe11cfb SH |
698 | const struct attr * attr1 = p1; |
699 | const struct attr * attr2 = p2; | |
923de654 | 700 | |
718e3744 | 701 | if (attr1->flag == attr2->flag |
702 | && attr1->origin == attr2->origin | |
703 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
704 | && attr1->aspath == attr2->aspath |
705 | && attr1->community == attr2->community | |
718e3744 | 706 | && attr1->med == attr2->med |
3f9c7369 DS |
707 | && attr1->local_pref == attr2->local_pref |
708 | && attr1->rmap_change_flags == attr2->rmap_change_flags) | |
fb982c25 | 709 | { |
ffe11cfb SH |
710 | const struct attr_extra *ae1 = attr1->extra; |
711 | const struct attr_extra *ae2 = attr2->extra; | |
fb982c25 PJ |
712 | |
713 | if (ae1 && ae2 | |
714 | && ae1->aggregator_as == ae2->aggregator_as | |
715 | && ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr | |
716 | && ae1->weight == ae2->weight | |
0d9551dc | 717 | && ae1->tag == ae2->tag |
718e3744 | 718 | #ifdef HAVE_IPV6 |
fb982c25 PJ |
719 | && ae1->mp_nexthop_len == ae2->mp_nexthop_len |
720 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global) | |
721 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local) | |
718e3744 | 722 | #endif /* HAVE_IPV6 */ |
fb982c25 PJ |
723 | && IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in) |
724 | && ae1->ecommunity == ae2->ecommunity | |
725 | && ae1->cluster == ae2->cluster | |
689bb66c | 726 | && ae1->transit == ae2->transit |
f4c89855 LB |
727 | && (ae1->encap_tunneltype == ae2->encap_tunneltype) |
728 | && encap_same(ae1->encap_subtlvs, ae2->encap_subtlvs) | |
65efcfce LB |
729 | #if ENABLE_BGP_VNC |
730 | && encap_same(ae1->vnc_subtlvs, ae2->vnc_subtlvs) | |
731 | #endif | |
689bb66c | 732 | && IPV4_ADDR_SAME (&ae1->originator_id, &ae2->originator_id)) |
fb982c25 PJ |
733 | return 1; |
734 | else if (ae1 || ae2) | |
735 | return 0; | |
736 | /* neither attribute has extra attributes, so they're same */ | |
737 | return 1; | |
738 | } | |
718e3744 | 739 | else |
740 | return 0; | |
741 | } | |
742 | ||
94f2b392 | 743 | static void |
ffe11cfb | 744 | attrhash_init (void) |
718e3744 | 745 | { |
746 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
747 | } | |
748 | ||
289d2501 LB |
749 | /* |
750 | * special for hash_clean below | |
751 | */ | |
752 | static void | |
753 | attr_vfree (void *attr) | |
754 | { | |
755 | bgp_attr_extra_free ((struct attr *)attr); | |
756 | XFREE (MTYPE_ATTR, attr); | |
757 | } | |
758 | ||
228da428 CC |
759 | static void |
760 | attrhash_finish (void) | |
761 | { | |
289d2501 | 762 | hash_clean(attrhash, attr_vfree); |
228da428 CC |
763 | hash_free (attrhash); |
764 | attrhash = NULL; | |
765 | } | |
766 | ||
94f2b392 | 767 | static void |
718e3744 | 768 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
769 | { | |
770 | struct attr *attr = backet->data; | |
771 | ||
772 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
773 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
774 | } | |
775 | ||
776 | void | |
777 | attr_show_all (struct vty *vty) | |
778 | { | |
779 | hash_iterate (attrhash, | |
780 | (void (*)(struct hash_backet *, void *)) | |
781 | attr_show_all_iterator, | |
782 | vty); | |
783 | } | |
784 | ||
94f2b392 | 785 | static void * |
923de654 | 786 | bgp_attr_hash_alloc (void *p) |
718e3744 | 787 | { |
ffd0c037 | 788 | const struct attr * val = (const struct attr *) p; |
718e3744 | 789 | struct attr *attr; |
790 | ||
791 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
792 | *attr = *val; | |
fb982c25 PJ |
793 | if (val->extra) |
794 | { | |
795 | attr->extra = bgp_attr_extra_new (); | |
796 | *attr->extra = *val->extra; | |
bede7744 LB |
797 | if (val->extra->encap_subtlvs) { |
798 | val->extra->encap_subtlvs = NULL; | |
f4c89855 | 799 | } |
65efcfce | 800 | #if ENABLE_BGP_VNC |
bede7744 LB |
801 | if (val->extra->vnc_subtlvs) { |
802 | val->extra->vnc_subtlvs = NULL; | |
65efcfce LB |
803 | } |
804 | #endif | |
fb982c25 | 805 | } |
718e3744 | 806 | attr->refcnt = 0; |
807 | return attr; | |
808 | } | |
809 | ||
810 | /* Internet argument attribute. */ | |
811 | struct attr * | |
812 | bgp_attr_intern (struct attr *attr) | |
813 | { | |
814 | struct attr *find; | |
815 | ||
816 | /* Intern referenced strucutre. */ | |
817 | if (attr->aspath) | |
818 | { | |
819 | if (! attr->aspath->refcnt) | |
820 | attr->aspath = aspath_intern (attr->aspath); | |
821 | else | |
822 | attr->aspath->refcnt++; | |
823 | } | |
824 | if (attr->community) | |
825 | { | |
826 | if (! attr->community->refcnt) | |
827 | attr->community = community_intern (attr->community); | |
828 | else | |
829 | attr->community->refcnt++; | |
830 | } | |
fb982c25 | 831 | if (attr->extra) |
718e3744 | 832 | { |
fb982c25 PJ |
833 | struct attr_extra *attre = attr->extra; |
834 | ||
835 | if (attre->ecommunity) | |
836 | { | |
837 | if (! attre->ecommunity->refcnt) | |
838 | attre->ecommunity = ecommunity_intern (attre->ecommunity); | |
839 | else | |
840 | attre->ecommunity->refcnt++; | |
f6f434b2 | 841 | |
fb982c25 PJ |
842 | } |
843 | if (attre->cluster) | |
844 | { | |
845 | if (! attre->cluster->refcnt) | |
846 | attre->cluster = cluster_intern (attre->cluster); | |
847 | else | |
848 | attre->cluster->refcnt++; | |
849 | } | |
850 | if (attre->transit) | |
851 | { | |
852 | if (! attre->transit->refcnt) | |
853 | attre->transit = transit_intern (attre->transit); | |
854 | else | |
855 | attre->transit->refcnt++; | |
856 | } | |
bede7744 LB |
857 | if (attre->encap_subtlvs) |
858 | { | |
859 | if (! attre->encap_subtlvs->refcnt) | |
860 | attre->encap_subtlvs = encap_intern (attre->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
861 | else | |
862 | attre->encap_subtlvs->refcnt++; | |
863 | } | |
864 | #if ENABLE_BGP_VNC | |
865 | if (attre->vnc_subtlvs) | |
866 | { | |
867 | if (! attre->vnc_subtlvs->refcnt) | |
868 | attre->vnc_subtlvs = encap_intern (attre->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
869 | else | |
870 | attre->vnc_subtlvs->refcnt++; | |
871 | } | |
872 | #endif | |
718e3744 | 873 | } |
f6f434b2 | 874 | |
718e3744 | 875 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); |
876 | find->refcnt++; | |
bede7744 | 877 | |
718e3744 | 878 | return find; |
879 | } | |
880 | ||
3f9c7369 DS |
881 | /** |
882 | * Increment the refcount on various structures that attr holds. | |
883 | * Note on usage: call _only_ when the 'attr' object has already | |
884 | * been 'intern'ed and exists in 'attrhash' table. The function | |
885 | * serves to hold a reference to that (real) object. | |
886 | * Note also that the caller can safely call bgp_attr_unintern() | |
887 | * after calling bgp_attr_refcount(). That would release the | |
888 | * reference and could result in a free() of the attr object. | |
889 | */ | |
890 | struct attr * | |
891 | bgp_attr_refcount (struct attr *attr) | |
892 | { | |
893 | /* Intern referenced strucutre. */ | |
894 | if (attr->aspath) | |
895 | attr->aspath->refcnt++; | |
896 | ||
897 | if (attr->community) | |
898 | attr->community->refcnt++; | |
899 | ||
900 | if (attr->extra) | |
901 | { | |
902 | struct attr_extra *attre = attr->extra; | |
903 | if (attre->ecommunity) | |
904 | attre->ecommunity->refcnt++; | |
905 | ||
906 | if (attre->cluster) | |
907 | attre->cluster->refcnt++; | |
908 | ||
909 | if (attre->transit) | |
910 | attre->transit->refcnt++; | |
bede7744 LB |
911 | |
912 | if (attre->encap_subtlvs) | |
913 | attre->encap_subtlvs->refcnt++; | |
914 | ||
915 | #if ENABLE_BGP_VNC | |
916 | if (attre->vnc_subtlvs) | |
917 | attre->vnc_subtlvs->refcnt++; | |
918 | #endif | |
3f9c7369 DS |
919 | } |
920 | attr->refcnt++; | |
921 | return attr; | |
922 | } | |
03e214c8 | 923 | |
718e3744 | 924 | /* Make network statement's attribute. */ |
925 | struct attr * | |
926 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
927 | { | |
928 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
929 | bgp_attr_extra_get (attr); |
930 | ||
718e3744 | 931 | attr->origin = origin; |
932 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
933 | attr->aspath = aspath_empty (); | |
934 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
fb982c25 | 935 | attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT; |
0d9551dc | 936 | attr->extra->tag = 0; |
718e3744 | 937 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
938 | #ifdef HAVE_IPV6 | |
fb982c25 | 939 | attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 940 | #endif |
03e214c8 | 941 | |
718e3744 | 942 | return attr; |
943 | } | |
944 | ||
03e214c8 | 945 | |
718e3744 | 946 | /* Make network statement's attribute. */ |
947 | struct attr * | |
948 | bgp_attr_default_intern (u_char origin) | |
949 | { | |
950 | struct attr attr; | |
951 | struct attr *new; | |
e16a4133 | 952 | |
f4c89855 LB |
953 | memset (&attr, 0, sizeof (struct attr)); |
954 | bgp_attr_extra_get (&attr); | |
955 | ||
03e214c8 | 956 | bgp_attr_default_set(&attr, origin); |
718e3744 | 957 | |
958 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
959 | bgp_attr_extra_free (&attr); |
960 | ||
f6f434b2 | 961 | aspath_unintern (&new->aspath); |
718e3744 | 962 | return new; |
963 | } | |
964 | ||
b5d58c32 | 965 | /* Create the attributes for an aggregate */ |
718e3744 | 966 | struct attr * |
967 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
968 | struct aspath *aspath, | |
42f7e184 DS |
969 | struct community *community, int as_set, |
970 | u_char atomic_aggregate) | |
718e3744 | 971 | { |
972 | struct attr attr; | |
973 | struct attr *new; | |
938ef3a2 | 974 | struct attr_extra attre; |
718e3744 | 975 | |
976 | memset (&attr, 0, sizeof (struct attr)); | |
938ef3a2 JBD |
977 | memset (&attre, 0, sizeof (struct attr_extra)); |
978 | attr.extra = &attre; | |
979 | ||
718e3744 | 980 | /* Origin attribute. */ |
981 | attr.origin = origin; | |
982 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
983 | ||
984 | /* AS path attribute. */ | |
985 | if (aspath) | |
986 | attr.aspath = aspath_intern (aspath); | |
987 | else | |
988 | attr.aspath = aspath_empty (); | |
989 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
990 | ||
991 | /* Next hop attribute. */ | |
992 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
993 | ||
994 | if (community) | |
995 | { | |
996 | attr.community = community; | |
997 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
998 | } | |
999 | ||
938ef3a2 | 1000 | attre.weight = BGP_ATTR_DEFAULT_WEIGHT; |
718e3744 | 1001 | #ifdef HAVE_IPV6 |
938ef3a2 | 1002 | attre.mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 1003 | #endif |
42f7e184 | 1004 | if (! as_set || atomic_aggregate) |
718e3744 | 1005 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); |
1006 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1007 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
938ef3a2 | 1008 | attre.aggregator_as = bgp->confed_id; |
718e3744 | 1009 | else |
938ef3a2 JBD |
1010 | attre.aggregator_as = bgp->as; |
1011 | attre.aggregator_addr = bgp->router_id; | |
718e3744 | 1012 | |
1013 | new = bgp_attr_intern (&attr); | |
938ef3a2 | 1014 | |
f6f434b2 | 1015 | aspath_unintern (&new->aspath); |
718e3744 | 1016 | return new; |
1017 | } | |
1018 | ||
b881c707 PJ |
1019 | /* Unintern just the sub-components of the attr, but not the attr */ |
1020 | void | |
1021 | bgp_attr_unintern_sub (struct attr *attr) | |
1022 | { | |
1023 | /* aspath refcount shoud be decrement. */ | |
1024 | if (attr->aspath) | |
1025 | aspath_unintern (&attr->aspath); | |
d92a2f39 | 1026 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)); |
b881c707 PJ |
1027 | |
1028 | if (attr->community) | |
1029 | community_unintern (&attr->community); | |
d92a2f39 | 1030 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)); |
b881c707 PJ |
1031 | |
1032 | if (attr->extra) | |
1033 | { | |
1034 | if (attr->extra->ecommunity) | |
1035 | ecommunity_unintern (&attr->extra->ecommunity); | |
d92a2f39 | 1036 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES)); |
b881c707 PJ |
1037 | |
1038 | if (attr->extra->cluster) | |
1039 | cluster_unintern (attr->extra->cluster); | |
d92a2f39 | 1040 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST)); |
b881c707 PJ |
1041 | |
1042 | if (attr->extra->transit) | |
1043 | transit_unintern (attr->extra->transit); | |
bede7744 LB |
1044 | |
1045 | if (attr->extra->encap_subtlvs) | |
1046 | encap_unintern (&attr->extra->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
1047 | ||
1048 | #if ENABLE_BGP_VNC | |
1049 | if (attr->extra->vnc_subtlvs) | |
1050 | encap_unintern (&attr->extra->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1051 | #endif | |
b881c707 PJ |
1052 | } |
1053 | } | |
1054 | ||
718e3744 | 1055 | /* Free bgp attribute and aspath. */ |
1056 | void | |
1a2fd707 | 1057 | bgp_attr_unintern (struct attr **pattr) |
718e3744 | 1058 | { |
1a2fd707 | 1059 | struct attr *attr = *pattr; |
718e3744 | 1060 | struct attr *ret; |
b881c707 | 1061 | struct attr tmp; |
b9f1dca1 | 1062 | struct attr_extra tmp_extra; |
f6f434b2 | 1063 | |
718e3744 | 1064 | /* Decrement attribute reference. */ |
1a2fd707 | 1065 | attr->refcnt--; |
b881c707 | 1066 | |
1a2fd707 | 1067 | tmp = *attr; |
b881c707 | 1068 | |
1a2fd707 | 1069 | if (attr->extra) |
fb982c25 | 1070 | { |
b9f1dca1 | 1071 | tmp.extra = &tmp_extra; |
1a2fd707 | 1072 | memcpy (tmp.extra, attr->extra, sizeof (struct attr_extra)); |
fb982c25 | 1073 | } |
f6f434b2 | 1074 | |
718e3744 | 1075 | /* If reference becomes zero then free attribute object. */ |
1a2fd707 JBD |
1076 | if (attr->refcnt == 0) |
1077 | { | |
1078 | ret = hash_release (attrhash, attr); | |
718e3744 | 1079 | assert (ret != NULL); |
1a2fd707 JBD |
1080 | bgp_attr_extra_free (attr); |
1081 | XFREE (MTYPE_ATTR, attr); | |
1082 | *pattr = NULL; | |
718e3744 | 1083 | } |
1084 | ||
b881c707 | 1085 | bgp_attr_unintern_sub (&tmp); |
718e3744 | 1086 | } |
1087 | ||
1088 | void | |
1089 | bgp_attr_flush (struct attr *attr) | |
1090 | { | |
1091 | if (attr->aspath && ! attr->aspath->refcnt) | |
f9a3a260 LB |
1092 | { |
1093 | aspath_free (attr->aspath); | |
1094 | attr->aspath = NULL; | |
1095 | } | |
718e3744 | 1096 | if (attr->community && ! attr->community->refcnt) |
f9a3a260 LB |
1097 | { |
1098 | community_free (attr->community); | |
1099 | attr->community = NULL; | |
1100 | } | |
fb982c25 PJ |
1101 | if (attr->extra) |
1102 | { | |
1103 | struct attr_extra *attre = attr->extra; | |
f6f434b2 | 1104 | |
fb982c25 | 1105 | if (attre->ecommunity && ! attre->ecommunity->refcnt) |
f6f434b2 | 1106 | ecommunity_free (&attre->ecommunity); |
fb982c25 | 1107 | if (attre->cluster && ! attre->cluster->refcnt) |
f9a3a260 LB |
1108 | { |
1109 | cluster_free (attre->cluster); | |
1110 | attre->cluster = NULL; | |
1111 | } | |
fb982c25 | 1112 | if (attre->transit && ! attre->transit->refcnt) |
f9a3a260 LB |
1113 | { |
1114 | transit_free (attre->transit); | |
1115 | attre->transit = NULL; | |
1116 | } | |
bede7744 LB |
1117 | if (attre->encap_subtlvs && ! attre->encap_subtlvs->refcnt) |
1118 | { | |
1119 | encap_free(attre->encap_subtlvs); | |
1120 | attre->encap_subtlvs = NULL; | |
1121 | } | |
65efcfce | 1122 | #if ENABLE_BGP_VNC |
bede7744 LB |
1123 | if (attre->vnc_subtlvs && ! attre->vnc_subtlvs->refcnt) |
1124 | { | |
1125 | encap_free(attre->vnc_subtlvs); | |
1126 | attre->vnc_subtlvs = NULL; | |
1127 | } | |
65efcfce | 1128 | #endif |
fb982c25 | 1129 | } |
718e3744 | 1130 | } |
1131 | ||
b881c707 PJ |
1132 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1133 | * avoid resetting sessions for malformed attributes which are | |
1134 | * are partial/optional and hence where the error likely was not | |
1135 | * introduced by the sending neighbour. | |
1136 | */ | |
1137 | static bgp_attr_parse_ret_t | |
835315bf PJ |
1138 | bgp_attr_malformed (struct bgp_attr_parser_args *args, u_char subcode, |
1139 | bgp_size_t length) | |
b881c707 | 1140 | { |
835315bf PJ |
1141 | struct peer *const peer = args->peer; |
1142 | const u_int8_t flags = args->flags; | |
1143 | /* startp and length must be special-cased, as whether or not to | |
1144 | * send the attribute data with the NOTIFY depends on the error, | |
1145 | * the caller therefore signals this with the seperate length argument | |
1146 | */ | |
bd471fea | 1147 | u_char *notify_datap = (length > 0 ? args->startp : NULL); |
835315bf | 1148 | |
b881c707 | 1149 | /* Only relax error handling for eBGP peers */ |
6d85b15b | 1150 | if (peer->sort != BGP_PEER_EBGP) |
b881c707 PJ |
1151 | { |
1152 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1153 | notify_datap, length); |
b881c707 PJ |
1154 | return BGP_ATTR_PARSE_ERROR; |
1155 | ||
1156 | } | |
1157 | ||
bd471fea PJ |
1158 | /* Adjust the stream getp to the end of the attribute, in case we can |
1159 | * still proceed but the caller hasn't read all the attribute. | |
1160 | */ | |
1161 | stream_set_getp (BGP_INPUT (peer), | |
1162 | (args->startp - STREAM_DATA (BGP_INPUT (peer))) | |
1163 | + args->total); | |
1164 | ||
835315bf | 1165 | switch (args->type) { |
fa61e16d PJ |
1166 | /* where an attribute is relatively inconsequential, e.g. it does not |
1167 | * affect route selection, and can be safely ignored, then any such | |
1168 | * attributes which are malformed should just be ignored and the route | |
1169 | * processed as normal. | |
b881c707 PJ |
1170 | */ |
1171 | case BGP_ATTR_AS4_AGGREGATOR: | |
1172 | case BGP_ATTR_AGGREGATOR: | |
1173 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1174 | return BGP_ATTR_PARSE_PROCEED; | |
1175 | ||
1176 | /* Core attributes, particularly ones which may influence route | |
fa61e16d | 1177 | * selection, should always cause session resets |
b881c707 PJ |
1178 | */ |
1179 | case BGP_ATTR_ORIGIN: | |
1180 | case BGP_ATTR_AS_PATH: | |
1181 | case BGP_ATTR_NEXT_HOP: | |
1182 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1183 | case BGP_ATTR_LOCAL_PREF: | |
1184 | case BGP_ATTR_COMMUNITIES: | |
1185 | case BGP_ATTR_ORIGINATOR_ID: | |
1186 | case BGP_ATTR_CLUSTER_LIST: | |
1187 | case BGP_ATTR_MP_REACH_NLRI: | |
1188 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1189 | case BGP_ATTR_EXT_COMMUNITIES: | |
1190 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1191 | notify_datap, length); |
b881c707 PJ |
1192 | return BGP_ATTR_PARSE_ERROR; |
1193 | } | |
1194 | ||
1195 | /* Partial optional attributes that are malformed should not cause | |
1196 | * the whole session to be reset. Instead treat it as a withdrawal | |
1197 | * of the routes, if possible. | |
1198 | */ | |
835315bf PJ |
1199 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS) |
1200 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1201 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
b881c707 PJ |
1202 | return BGP_ATTR_PARSE_WITHDRAW; |
1203 | ||
1204 | /* default to reset */ | |
f57000c0 | 1205 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
b881c707 PJ |
1206 | } |
1207 | ||
afcb7679 DO |
1208 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1209 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1210 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1211 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1212 | non-transitive" attribute. */ | |
1213 | static void | |
835315bf PJ |
1214 | bgp_attr_flags_diagnose (struct bgp_attr_parser_args *args, |
1215 | u_int8_t desired_flags /* how RFC says it must be */ | |
afcb7679 DO |
1216 | ) |
1217 | { | |
1218 | u_char seen = 0, i; | |
835315bf PJ |
1219 | u_char real_flags = args->flags; |
1220 | const u_int8_t attr_code = args->type; | |
1221 | ||
afcb7679 DO |
1222 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; |
1223 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1224 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1225 | if | |
1226 | ( | |
1227 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) != | |
1228 | CHECK_FLAG (real_flags, attr_flag_str[i].key) | |
1229 | ) | |
1230 | { | |
16286195 DS |
1231 | zlog_err ("%s attribute must%s be flagged as \"%s\"", |
1232 | LOOKUP (attr_str, attr_code), | |
1233 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) ? "" : " not", | |
1234 | attr_flag_str[i].str); | |
afcb7679 DO |
1235 | seen = 1; |
1236 | } | |
fa5831e8 PJ |
1237 | if (!seen) |
1238 | { | |
16286195 DS |
1239 | zlog_debug ("Strange, %s called for attr %s, but no problem found with flags" |
1240 | " (real flags 0x%x, desired 0x%x)", | |
1241 | __func__, LOOKUP (attr_str, attr_code), | |
1242 | real_flags, desired_flags); | |
fa5831e8 | 1243 | } |
afcb7679 DO |
1244 | } |
1245 | ||
3ecab4c8 PJ |
1246 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1247 | * as will PARTIAL for optional+transitive attributes. | |
1248 | */ | |
1249 | const u_int8_t attr_flags_values [] = { | |
1250 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1251 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1252 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1253 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1254 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1255 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1256 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1257 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1258 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1259 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1260 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1261 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1262 | [BGP_ATTR_EXT_COMMUNITIES] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1263 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1264 | [BGP_ATTR_AS4_AGGREGATOR] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1265 | }; | |
099111ef | 1266 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 PJ |
1267 | |
1268 | static int | |
835315bf | 1269 | bgp_attr_flag_invalid (struct bgp_attr_parser_args *args) |
3ecab4c8 PJ |
1270 | { |
1271 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
835315bf PJ |
1272 | const u_int8_t flags = args->flags; |
1273 | const u_int8_t attr_code = args->type; | |
3ecab4c8 PJ |
1274 | |
1275 | /* there may be attributes we don't know about */ | |
1276 | if (attr_code > attr_flags_values_max) | |
1277 | return 0; | |
1278 | if (attr_flags_values[attr_code] == 0) | |
1279 | return 0; | |
1280 | ||
1281 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set to | |
1282 | * 1." | |
1283 | */ | |
1284 | if (!CHECK_FLAG (BGP_ATTR_FLAG_OPTIONAL, flags) | |
1285 | && !CHECK_FLAG (BGP_ATTR_FLAG_TRANS, flags)) | |
1286 | { | |
16286195 DS |
1287 | zlog_err ("%s well-known attributes must have transitive flag set (%x)", |
1288 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1289 | return 1; |
1290 | } | |
1291 | ||
1292 | /* "For well-known attributes and for optional non-transitive attributes, | |
1293 | * the Partial bit MUST be set to 0." | |
1294 | */ | |
1295 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
1296 | { | |
1297 | if (!CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL)) | |
1298 | { | |
16286195 DS |
1299 | zlog_err ("%s well-known attribute " |
1300 | "must NOT have the partial flag set (%x)", | |
1301 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1302 | return 1; |
1303 | } | |
1304 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1305 | && !CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1306 | { | |
16286195 DS |
1307 | zlog_err ("%s optional + transitive attribute " |
1308 | "must NOT have the partial flag set (%x)", | |
1309 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1310 | return 1; |
1311 | } | |
1312 | } | |
1313 | ||
1314 | /* Optional transitive attributes may go through speakers that don't | |
1315 | * reocgnise them and set the Partial bit. | |
1316 | */ | |
1317 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1318 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1319 | SET_FLAG (mask, BGP_ATTR_FLAG_PARTIAL); | |
1320 | ||
683f2b86 | 1321 | if ((flags & ~mask) |
3ecab4c8 PJ |
1322 | == attr_flags_values[attr_code]) |
1323 | return 0; | |
1324 | ||
835315bf | 1325 | bgp_attr_flags_diagnose (args, attr_flags_values[attr_code]); |
3ecab4c8 PJ |
1326 | return 1; |
1327 | } | |
1328 | ||
718e3744 | 1329 | /* Get origin attribute of the update message. */ |
b881c707 | 1330 | static bgp_attr_parse_ret_t |
835315bf | 1331 | bgp_attr_origin (struct bgp_attr_parser_args *args) |
718e3744 | 1332 | { |
835315bf PJ |
1333 | struct peer *const peer = args->peer; |
1334 | struct attr *const attr = args->attr; | |
1335 | const bgp_size_t length = args->length; | |
1336 | ||
718e3744 | 1337 | /* If any recognized attribute has Attribute Length that conflicts |
1338 | with the expected length (based on the attribute type code), then | |
1339 | the Error Subcode is set to Attribute Length Error. The Data | |
1340 | field contains the erroneous attribute (type, length and | |
1341 | value). */ | |
1342 | if (length != 1) | |
1343 | { | |
16286195 | 1344 | zlog_err ("Origin attribute length is not one %d", length); |
835315bf | 1345 | return bgp_attr_malformed (args, |
b881c707 | 1346 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1347 | args->total); |
718e3744 | 1348 | } |
1349 | ||
1350 | /* Fetch origin attribute. */ | |
1351 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
1352 | ||
1353 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1354 | Subcode is set to Invalid Origin Attribute. The Data field | |
1355 | contains the unrecognized attribute (type, length and value). */ | |
1356 | if ((attr->origin != BGP_ORIGIN_IGP) | |
1357 | && (attr->origin != BGP_ORIGIN_EGP) | |
1358 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
1359 | { | |
16286195 | 1360 | zlog_err ("Origin attribute value is invalid %d", attr->origin); |
835315bf | 1361 | return bgp_attr_malformed (args, |
b881c707 | 1362 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
835315bf | 1363 | args->total); |
718e3744 | 1364 | } |
1365 | ||
1366 | /* Set oring attribute flag. */ | |
1367 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
1368 | ||
1369 | return 0; | |
1370 | } | |
ab005298 PJ |
1371 | |
1372 | /* Parse AS path information. This function is wrapper of | |
1373 | aspath_parse. */ | |
1374 | static int | |
835315bf | 1375 | bgp_attr_aspath (struct bgp_attr_parser_args *args) |
718e3744 | 1376 | { |
835315bf PJ |
1377 | struct attr *const attr = args->attr; |
1378 | struct peer *const peer = args->peer; | |
1379 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1380 | |
ab005298 PJ |
1381 | /* |
1382 | * peer with AS4 => will get 4Byte ASnums | |
1383 | * otherwise, will get 16 Bit | |
0b2aa3a0 | 1384 | */ |
ab005298 PJ |
1385 | attr->aspath = aspath_parse (peer->ibuf, length, |
1386 | CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)); | |
0b2aa3a0 | 1387 | |
ab005298 PJ |
1388 | /* In case of IBGP, length will be zero. */ |
1389 | if (! attr->aspath) | |
cddb8112 | 1390 | { |
16286195 | 1391 | zlog_err ("Malformed AS path from %s, length is %d", peer->host, length); |
835315bf | 1392 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, 0); |
cddb8112 | 1393 | } |
cddb8112 | 1394 | |
ab005298 PJ |
1395 | /* Set aspath attribute flag. */ |
1396 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
0b2aa3a0 | 1397 | |
b881c707 | 1398 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1399 | } |
1400 | ||
b881c707 | 1401 | static bgp_attr_parse_ret_t |
835315bf | 1402 | bgp_attr_aspath_check (struct peer *const peer, struct attr *const attr) |
0b2aa3a0 PJ |
1403 | { |
1404 | /* These checks were part of bgp_attr_aspath, but with | |
1405 | * as4 we should to check aspath things when | |
1406 | * aspath synthesizing with as4_path has already taken place. | |
1407 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1408 | * not right. | |
1409 | * So do the checks later, i.e. here | |
1410 | */ | |
1411 | struct bgp *bgp = peer->bgp; | |
1412 | struct aspath *aspath; | |
1413 | ||
ca87e1d3 | 1414 | /* Confederation sanity check. */ |
6d85b15b JBD |
1415 | if ((peer->sort == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || |
1416 | (peer->sort == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
ca87e1d3 | 1417 | { |
16286195 | 1418 | zlog_err ("Malformed AS path from %s", peer->host); |
835315bf PJ |
1419 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1420 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1421 | return BGP_ATTR_PARSE_ERROR; | |
ca87e1d3 VT |
1422 | } |
1423 | ||
718e3744 | 1424 | /* First AS check for EBGP. */ |
1425 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
1426 | { | |
6d85b15b | 1427 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 1428 | && ! aspath_firstas_check (attr->aspath, peer->as)) |
1429 | { | |
16286195 | 1430 | zlog_err ("%s incorrect first AS (must be %u)", peer->host, peer->as); |
835315bf PJ |
1431 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1432 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1433 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1434 | } |
1435 | } | |
1436 | ||
1437 | /* local-as prepend */ | |
1438 | if (peer->change_local_as && | |
1439 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
1440 | { | |
1441 | aspath = aspath_dup (attr->aspath); | |
1442 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
f6f434b2 | 1443 | aspath_unintern (&attr->aspath); |
718e3744 | 1444 | attr->aspath = aspath_intern (aspath); |
1445 | } | |
1446 | ||
b881c707 | 1447 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1448 | } |
1449 | ||
ab005298 PJ |
1450 | /* Parse AS4 path information. This function is another wrapper of |
1451 | aspath_parse. */ | |
1452 | static int | |
835315bf | 1453 | bgp_attr_as4_path (struct bgp_attr_parser_args *args, struct aspath **as4_path) |
ab005298 | 1454 | { |
835315bf PJ |
1455 | struct peer *const peer = args->peer; |
1456 | struct attr *const attr = args->attr; | |
1457 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1458 | |
ab005298 PJ |
1459 | *as4_path = aspath_parse (peer->ibuf, length, 1); |
1460 | ||
b881c707 PJ |
1461 | /* In case of IBGP, length will be zero. */ |
1462 | if (!*as4_path) | |
1463 | { | |
16286195 | 1464 | zlog_err ("Malformed AS4 path from %s, length is %d", peer->host, length); |
835315bf | 1465 | return bgp_attr_malformed (args, |
b881c707 | 1466 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
835315bf | 1467 | 0); |
b881c707 PJ |
1468 | } |
1469 | ||
ab005298 PJ |
1470 | /* Set aspath attribute flag. */ |
1471 | if (as4_path) | |
1472 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH); | |
1473 | ||
b881c707 | 1474 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1475 | } |
1476 | ||
718e3744 | 1477 | /* Nexthop attribute. */ |
b881c707 | 1478 | static bgp_attr_parse_ret_t |
835315bf | 1479 | bgp_attr_nexthop (struct bgp_attr_parser_args *args) |
718e3744 | 1480 | { |
835315bf PJ |
1481 | struct peer *const peer = args->peer; |
1482 | struct attr *const attr = args->attr; | |
1483 | const bgp_size_t length = args->length; | |
1484 | ||
bc3443eb | 1485 | in_addr_t nexthop_h, nexthop_n; |
718e3744 | 1486 | |
718e3744 | 1487 | /* Check nexthop attribute length. */ |
1488 | if (length != 4) | |
1489 | { | |
16286195 | 1490 | zlog_err ("Nexthop attribute length isn't four [%d]", length); |
718e3744 | 1491 | |
835315bf | 1492 | return bgp_attr_malformed (args, |
b881c707 | 1493 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1494 | args->total); |
718e3744 | 1495 | } |
1496 | ||
58298ccd DS |
1497 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP |
1498 | attribute must result in a NOTIFICATION message (this is implemented below). | |
1499 | At the same time, semantically incorrect NEXT_HOP is more likely to be just | |
1500 | logged locally (this is implemented somewhere else). The UPDATE message | |
1501 | gets ignored in any of these cases. */ | |
bc3443eb DO |
1502 | nexthop_n = stream_get_ipv4 (peer->ibuf); |
1503 | nexthop_h = ntohl (nexthop_n); | |
cebb7440 LB |
1504 | if ((IPV4_NET0 (nexthop_h) || IPV4_NET127 (nexthop_h) || IPV4_CLASS_DE (nexthop_h)) |
1505 | && !BGP_DEBUG (allow_martians, ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
bc3443eb DO |
1506 | { |
1507 | char buf[INET_ADDRSTRLEN]; | |
bb02b823 | 1508 | inet_ntop (AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); |
16286195 | 1509 | zlog_err ("Martian nexthop %s", buf); |
835315bf | 1510 | return bgp_attr_malformed (args, |
bc3443eb | 1511 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, |
835315bf | 1512 | args->total); |
bc3443eb DO |
1513 | } |
1514 | ||
1515 | attr->nexthop.s_addr = nexthop_n; | |
718e3744 | 1516 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
1517 | ||
b881c707 | 1518 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1519 | } |
1520 | ||
1521 | /* MED atrribute. */ | |
b881c707 | 1522 | static bgp_attr_parse_ret_t |
835315bf | 1523 | bgp_attr_med (struct bgp_attr_parser_args *args) |
718e3744 | 1524 | { |
835315bf PJ |
1525 | struct peer *const peer = args->peer; |
1526 | struct attr *const attr = args->attr; | |
1527 | const bgp_size_t length = args->length; | |
1528 | ||
718e3744 | 1529 | /* Length check. */ |
1530 | if (length != 4) | |
1531 | { | |
16286195 | 1532 | zlog_err ("MED attribute length isn't four [%d]", length); |
b881c707 | 1533 | |
835315bf | 1534 | return bgp_attr_malformed (args, |
b881c707 | 1535 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1536 | args->total); |
718e3744 | 1537 | } |
1538 | ||
1539 | attr->med = stream_getl (peer->ibuf); | |
1540 | ||
1541 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1542 | ||
b881c707 | 1543 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1544 | } |
1545 | ||
1546 | /* Local preference attribute. */ | |
b881c707 | 1547 | static bgp_attr_parse_ret_t |
835315bf | 1548 | bgp_attr_local_pref (struct bgp_attr_parser_args *args) |
718e3744 | 1549 | { |
835315bf PJ |
1550 | struct peer *const peer = args->peer; |
1551 | struct attr *const attr = args->attr; | |
1552 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1553 | |
a624cae2 DO |
1554 | /* Length check. */ |
1555 | if (length != 4) | |
1556 | { | |
16286195 | 1557 | zlog_err ("LOCAL_PREF attribute length isn't 4 [%u]", length); |
835315bf | 1558 | return bgp_attr_malformed (args, |
a624cae2 | 1559 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1560 | args->total); |
a624cae2 | 1561 | } |
0ea968d2 | 1562 | |
718e3744 | 1563 | /* If it is contained in an UPDATE message that is received from an |
1564 | external peer, then this attribute MUST be ignored by the | |
1565 | receiving speaker. */ | |
6d85b15b | 1566 | if (peer->sort == BGP_PEER_EBGP) |
718e3744 | 1567 | { |
9985f83c | 1568 | stream_forward_getp (peer->ibuf, length); |
b881c707 | 1569 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1570 | } |
1571 | ||
a624cae2 | 1572 | attr->local_pref = stream_getl (peer->ibuf); |
718e3744 | 1573 | |
1574 | /* Set atomic aggregate flag. */ | |
1575 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1576 | ||
b881c707 | 1577 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1578 | } |
1579 | ||
1580 | /* Atomic aggregate. */ | |
94f2b392 | 1581 | static int |
835315bf | 1582 | bgp_attr_atomic (struct bgp_attr_parser_args *args) |
718e3744 | 1583 | { |
835315bf PJ |
1584 | struct attr *const attr = args->attr; |
1585 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1586 | |
9eba2ada | 1587 | /* Length check. */ |
718e3744 | 1588 | if (length != 0) |
1589 | { | |
16286195 | 1590 | zlog_err ("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", length); |
835315bf | 1591 | return bgp_attr_malformed (args, |
b881c707 | 1592 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1593 | args->total); |
718e3744 | 1594 | } |
1595 | ||
1596 | /* Set atomic aggregate flag. */ | |
1597 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1598 | ||
b881c707 | 1599 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1600 | } |
1601 | ||
1602 | /* Aggregator attribute */ | |
94f2b392 | 1603 | static int |
835315bf | 1604 | bgp_attr_aggregator (struct bgp_attr_parser_args *args) |
718e3744 | 1605 | { |
835315bf PJ |
1606 | struct peer *const peer = args->peer; |
1607 | struct attr *const attr = args->attr; | |
1608 | const bgp_size_t length = args->length; | |
1609 | ||
0b2aa3a0 | 1610 | int wantedlen = 6; |
fb982c25 | 1611 | struct attr_extra *attre = bgp_attr_extra_get (attr); |
3ecab4c8 | 1612 | |
0b2aa3a0 | 1613 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
b881c707 | 1614 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1615 | wantedlen = 8; |
1616 | ||
1617 | if (length != wantedlen) | |
718e3744 | 1618 | { |
16286195 | 1619 | zlog_err ("AGGREGATOR attribute length isn't %u [%u]", wantedlen, length); |
835315bf | 1620 | return bgp_attr_malformed (args, |
b881c707 | 1621 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1622 | args->total); |
718e3744 | 1623 | } |
0b2aa3a0 PJ |
1624 | |
1625 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1626 | attre->aggregator_as = stream_getl (peer->ibuf); | |
1627 | else | |
1628 | attre->aggregator_as = stream_getw (peer->ibuf); | |
fb982c25 | 1629 | attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1630 | |
1631 | /* Set atomic aggregate flag. */ | |
1632 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1633 | ||
b881c707 | 1634 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1635 | } |
1636 | ||
0b2aa3a0 | 1637 | /* New Aggregator attribute */ |
b881c707 | 1638 | static bgp_attr_parse_ret_t |
835315bf PJ |
1639 | bgp_attr_as4_aggregator (struct bgp_attr_parser_args *args, |
1640 | as_t *as4_aggregator_as, | |
1641 | struct in_addr *as4_aggregator_addr) | |
0b2aa3a0 | 1642 | { |
835315bf PJ |
1643 | struct peer *const peer = args->peer; |
1644 | struct attr *const attr = args->attr; | |
1645 | const bgp_size_t length = args->length; | |
1646 | ||
0b2aa3a0 PJ |
1647 | if (length != 8) |
1648 | { | |
16286195 | 1649 | zlog_err ("New Aggregator length is not 8 [%d]", length); |
835315bf | 1650 | return bgp_attr_malformed (args, |
b881c707 | 1651 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1652 | 0); |
0b2aa3a0 | 1653 | } |
3ecab4c8 | 1654 | |
0b2aa3a0 PJ |
1655 | *as4_aggregator_as = stream_getl (peer->ibuf); |
1656 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1657 | ||
1658 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1659 | ||
b881c707 | 1660 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1661 | } |
1662 | ||
1663 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1664 | */ | |
b881c707 | 1665 | static bgp_attr_parse_ret_t |
835315bf PJ |
1666 | bgp_attr_munge_as4_attrs (struct peer *const peer, |
1667 | struct attr *const attr, | |
0b2aa3a0 PJ |
1668 | struct aspath *as4_path, as_t as4_aggregator, |
1669 | struct in_addr *as4_aggregator_addr) | |
1670 | { | |
1671 | int ignore_as4_path = 0; | |
1672 | struct aspath *newpath; | |
1673 | struct attr_extra *attre = attr->extra; | |
bb7bef14 PJ |
1674 | |
1675 | if (!attr->aspath) | |
1676 | { | |
1677 | /* NULL aspath shouldn't be possible as bgp_attr_parse should have | |
1678 | * checked that all well-known, mandatory attributes were present. | |
1679 | * | |
1680 | * Can only be a problem with peer itself - hard error | |
1681 | */ | |
1682 | return BGP_ATTR_PARSE_ERROR; | |
1683 | } | |
1684 | ||
b881c707 | 1685 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1686 | { |
1687 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1688 | * if given. | |
1689 | * It is worth a warning though, because the peer really | |
1690 | * should not send them | |
1691 | */ | |
1692 | if (BGP_DEBUG(as4, AS4)) | |
1693 | { | |
1694 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1695 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1696 | peer->host, "AS4 capable peer, yet it sent"); | |
1697 | ||
1698 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1699 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1700 | peer->host, "AS4 capable peer, yet it sent"); | |
1701 | } | |
1702 | ||
b881c707 | 1703 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1704 | } |
1705 | ||
0b2aa3a0 PJ |
1706 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR |
1707 | * because that may override AS4_PATH | |
1708 | */ | |
1709 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1710 | { | |
b881c707 | 1711 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
0b2aa3a0 | 1712 | { |
370b64a2 PJ |
1713 | assert (attre); |
1714 | ||
0b2aa3a0 PJ |
1715 | /* received both. |
1716 | * if the as_number in aggregator is not AS_TRANS, | |
1717 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1718 | * and the Aggregator shall be taken as | |
1719 | * info on the aggregating node, and the AS_PATH | |
1720 | * shall be taken as the AS_PATH | |
1721 | * otherwise | |
1722 | * the Aggregator shall be ignored and the | |
1723 | * AS4_AGGREGATOR shall be taken as the | |
1724 | * Aggregating node and the AS_PATH is to be | |
1725 | * constructed "as in all other cases" | |
1726 | */ | |
b881c707 | 1727 | if (attre->aggregator_as != BGP_AS_TRANS) |
0b2aa3a0 PJ |
1728 | { |
1729 | /* ignore */ | |
1730 | if ( BGP_DEBUG(as4, AS4)) | |
1731 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1732 | " send AGGREGATOR != AS_TRANS and" | |
1733 | " AS4_AGGREGATOR, so ignore" | |
1734 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1735 | ignore_as4_path = 1; | |
1736 | } | |
1737 | else | |
1738 | { | |
1739 | /* "New_aggregator shall be taken as aggregator" */ | |
1740 | attre->aggregator_as = as4_aggregator; | |
1741 | attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
1742 | } | |
1743 | } | |
1744 | else | |
1745 | { | |
1746 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1747 | * That is bogus - but reading the conditions | |
1748 | * we have to handle AS4_AGGREGATOR as if it were | |
1749 | * AGGREGATOR in that case | |
1750 | */ | |
1751 | if ( BGP_DEBUG(as4, AS4)) | |
1752 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1753 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1754 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
370b64a2 | 1755 | (attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1756 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1757 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
b881c707 | 1762 | if (!ignore_as4_path && (attr->flag & (ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)))) |
0b2aa3a0 | 1763 | { |
bb7bef14 PJ |
1764 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); |
1765 | aspath_unintern (&attr->aspath); | |
1766 | attr->aspath = aspath_intern (newpath); | |
0b2aa3a0 | 1767 | } |
b881c707 | 1768 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1769 | } |
1770 | ||
718e3744 | 1771 | /* Community attribute. */ |
b881c707 | 1772 | static bgp_attr_parse_ret_t |
835315bf | 1773 | bgp_attr_community (struct bgp_attr_parser_args *args) |
718e3744 | 1774 | { |
835315bf PJ |
1775 | struct peer *const peer = args->peer; |
1776 | struct attr *const attr = args->attr; | |
1777 | const bgp_size_t length = args->length; | |
b881c707 | 1778 | |
718e3744 | 1779 | if (length == 0) |
b2ceea18 PJ |
1780 | { |
1781 | attr->community = NULL; | |
b881c707 | 1782 | return BGP_ATTR_PARSE_PROCEED; |
b2ceea18 | 1783 | } |
0c466381 PJ |
1784 | |
1785 | attr->community = | |
1786 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
1787 | ||
1788 | /* XXX: fix community_parse to use stream API and remove this */ | |
1789 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1790 | |
0c466381 | 1791 | if (!attr->community) |
835315bf | 1792 | return bgp_attr_malformed (args, |
b881c707 | 1793 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
835315bf | 1794 | args->total); |
0c466381 | 1795 | |
718e3744 | 1796 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); |
1797 | ||
b881c707 | 1798 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1799 | } |
1800 | ||
1801 | /* Originator ID attribute. */ | |
b881c707 | 1802 | static bgp_attr_parse_ret_t |
835315bf | 1803 | bgp_attr_originator_id (struct bgp_attr_parser_args *args) |
718e3744 | 1804 | { |
835315bf PJ |
1805 | struct peer *const peer = args->peer; |
1806 | struct attr *const attr = args->attr; | |
1807 | const bgp_size_t length = args->length; | |
1808 | ||
d595b566 | 1809 | /* Length check. */ |
718e3744 | 1810 | if (length != 4) |
1811 | { | |
16286195 | 1812 | zlog_err ("Bad originator ID length %d", length); |
718e3744 | 1813 | |
835315bf | 1814 | return bgp_attr_malformed (args, |
b881c707 | 1815 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1816 | args->total); |
718e3744 | 1817 | } |
1818 | ||
fb982c25 PJ |
1819 | (bgp_attr_extra_get (attr))->originator_id.s_addr |
1820 | = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1821 | |
1822 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1823 | ||
b881c707 | 1824 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1825 | } |
1826 | ||
1827 | /* Cluster list attribute. */ | |
b881c707 | 1828 | static bgp_attr_parse_ret_t |
835315bf | 1829 | bgp_attr_cluster_list (struct bgp_attr_parser_args *args) |
718e3744 | 1830 | { |
835315bf PJ |
1831 | struct peer *const peer = args->peer; |
1832 | struct attr *const attr = args->attr; | |
1833 | const bgp_size_t length = args->length; | |
1834 | ||
718e3744 | 1835 | /* Check length. */ |
1836 | if (length % 4) | |
1837 | { | |
16286195 | 1838 | zlog_err ("Bad cluster list length %d", length); |
718e3744 | 1839 | |
835315bf PJ |
1840 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1841 | args->total); | |
718e3744 | 1842 | } |
1843 | ||
fb982c25 PJ |
1844 | (bgp_attr_extra_get (attr))->cluster |
1845 | = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); | |
b881c707 PJ |
1846 | |
1847 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1848 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1849 | |
1850 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1851 | ||
b881c707 | 1852 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1853 | } |
1854 | ||
1855 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1856 | int |
835315bf PJ |
1857 | bgp_mp_reach_parse (struct bgp_attr_parser_args *args, |
1858 | struct bgp_nlri *mp_update) | |
718e3744 | 1859 | { |
4c9641ba ML |
1860 | afi_t afi; |
1861 | safi_t safi; | |
718e3744 | 1862 | bgp_size_t nlri_len; |
6e4ab12f | 1863 | size_t start; |
718e3744 | 1864 | struct stream *s; |
835315bf PJ |
1865 | struct peer *const peer = args->peer; |
1866 | struct attr *const attr = args->attr; | |
1867 | const bgp_size_t length = args->length; | |
fb982c25 | 1868 | struct attr_extra *attre = bgp_attr_extra_get(attr); |
835315bf | 1869 | |
718e3744 | 1870 | /* Set end of packet. */ |
6e4ab12f PJ |
1871 | s = BGP_INPUT(peer); |
1872 | start = stream_get_getp(s); | |
1873 | ||
1874 | /* safe to read statically sized header? */ | |
1875 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1876 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1877 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1878 | { |
1879 | zlog_info ("%s: %s sent invalid length, %lu", | |
1880 | __func__, peer->host, (unsigned long)length); | |
f57000c0 | 1881 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1882 | } |
6e4ab12f | 1883 | |
718e3744 | 1884 | /* Load AFI, SAFI. */ |
1885 | afi = stream_getw (s); | |
1886 | safi = stream_getc (s); | |
1887 | ||
1888 | /* Get nexthop length. */ | |
fb982c25 | 1889 | attre->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1890 | |
03292809 PJ |
1891 | if (LEN_LEFT < attre->mp_nexthop_len) |
1892 | { | |
1893 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1894 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1895 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1896 | } |
6e4ab12f | 1897 | |
718e3744 | 1898 | /* Nexthop length check. */ |
fb982c25 | 1899 | switch (attre->mp_nexthop_len) |
718e3744 | 1900 | { |
801a9bcc DS |
1901 | case BGP_ATTR_NHLEN_IPV4: |
1902 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
66bed4f4 ML |
1903 | /* Probably needed for RFC 2283 */ |
1904 | if (attr->nexthop.s_addr == 0) | |
801a9bcc | 1905 | memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, IPV4_MAX_BYTELEN); |
718e3744 | 1906 | break; |
801a9bcc | 1907 | case BGP_ATTR_NHLEN_VPNV4: |
9206f9ec SH |
1908 | stream_getl (s); /* RD high */ |
1909 | stream_getl (s); /* RD low */ | |
801a9bcc | 1910 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); |
718e3744 | 1911 | break; |
1912 | #ifdef HAVE_IPV6 | |
801a9bcc | 1913 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
945c8fe9 LB |
1914 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: |
1915 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) | |
1916 | { | |
1917 | stream_getl (s); /* RD high */ | |
1918 | stream_getl (s); /* RD low */ | |
1919 | } | |
801a9bcc | 1920 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
718e3744 | 1921 | break; |
801a9bcc | 1922 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: |
945c8fe9 LB |
1923 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: |
1924 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
1925 | { | |
1926 | stream_getl (s); /* RD high */ | |
1927 | stream_getl (s); /* RD low */ | |
1928 | } | |
801a9bcc | 1929 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
945c8fe9 LB |
1930 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) |
1931 | { | |
1932 | stream_getl (s); /* RD high */ | |
1933 | stream_getl (s); /* RD low */ | |
1934 | } | |
801a9bcc | 1935 | stream_get (&attre->mp_nexthop_local, s, IPV6_MAX_BYTELEN); |
fb982c25 | 1936 | if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local)) |
718e3744 | 1937 | { |
1938 | char buf1[INET6_ADDRSTRLEN]; | |
1939 | char buf2[INET6_ADDRSTRLEN]; | |
1940 | ||
3f9c7369 | 1941 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3dd32081 DS |
1942 | zlog_debug ("%s rcvd nexthops %s, %s -- ignoring non-LL value", |
1943 | peer->host, | |
fb982c25 | 1944 | inet_ntop (AF_INET6, &attre->mp_nexthop_global, |
718e3744 | 1945 | buf1, INET6_ADDRSTRLEN), |
fb982c25 | 1946 | inet_ntop (AF_INET6, &attre->mp_nexthop_local, |
718e3744 | 1947 | buf2, INET6_ADDRSTRLEN)); |
1948 | ||
801a9bcc | 1949 | attre->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 1950 | } |
1951 | break; | |
1952 | #endif /* HAVE_IPV6 */ | |
1953 | default: | |
03292809 PJ |
1954 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
1955 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1956 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
718e3744 | 1957 | } |
1958 | ||
03292809 PJ |
1959 | if (!LEN_LEFT) |
1960 | { | |
1961 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1962 | __func__, peer->host); | |
f57000c0 | 1963 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1964 | } |
718e3744 | 1965 | |
6e4ab12f PJ |
1966 | { |
1967 | u_char val; | |
1968 | if ((val = stream_getc (s))) | |
1969 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
1970 | peer->host, val); | |
1971 | } | |
1972 | ||
1973 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 1974 | nlri_len = LEN_LEFT; |
6e4ab12f | 1975 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
1976 | { |
1977 | zlog_info ("%s: (%s) Failed to read NLRI", | |
1978 | __func__, peer->host); | |
f57000c0 | 1979 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1980 | } |
718e3744 | 1981 | |
1982 | mp_update->afi = afi; | |
1983 | mp_update->safi = safi; | |
1984 | mp_update->nlri = stream_pnt (s); | |
1985 | mp_update->length = nlri_len; | |
1986 | ||
9985f83c | 1987 | stream_forward_getp (s, nlri_len); |
718e3744 | 1988 | |
37da8fa9 DL |
1989 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI); |
1990 | ||
b881c707 | 1991 | return BGP_ATTR_PARSE_PROCEED; |
03292809 | 1992 | #undef LEN_LEFT |
718e3744 | 1993 | } |
1994 | ||
1995 | /* Multiprotocol unreachable parse */ | |
03292809 | 1996 | int |
835315bf | 1997 | bgp_mp_unreach_parse (struct bgp_attr_parser_args *args, |
718e3744 | 1998 | struct bgp_nlri *mp_withdraw) |
1999 | { | |
2000 | struct stream *s; | |
4c9641ba ML |
2001 | afi_t afi; |
2002 | safi_t safi; | |
718e3744 | 2003 | u_int16_t withdraw_len; |
835315bf | 2004 | struct peer *const peer = args->peer; |
37da8fa9 | 2005 | struct attr *const attr = args->attr; |
835315bf | 2006 | const bgp_size_t length = args->length; |
718e3744 | 2007 | |
2008 | s = peer->ibuf; | |
6e4ab12f PJ |
2009 | |
2010 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
2011 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
f57000c0 | 2012 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
6e4ab12f | 2013 | |
718e3744 | 2014 | afi = stream_getw (s); |
2015 | safi = stream_getc (s); | |
6e4ab12f PJ |
2016 | |
2017 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; | |
718e3744 | 2018 | |
718e3744 | 2019 | mp_withdraw->afi = afi; |
2020 | mp_withdraw->safi = safi; | |
2021 | mp_withdraw->nlri = stream_pnt (s); | |
2022 | mp_withdraw->length = withdraw_len; | |
2023 | ||
9985f83c | 2024 | stream_forward_getp (s, withdraw_len); |
718e3744 | 2025 | |
37da8fa9 DL |
2026 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI); |
2027 | ||
b881c707 | 2028 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2029 | } |
2030 | ||
2031 | /* Extended Community attribute. */ | |
b881c707 | 2032 | static bgp_attr_parse_ret_t |
835315bf | 2033 | bgp_attr_ext_communities (struct bgp_attr_parser_args *args) |
718e3744 | 2034 | { |
835315bf PJ |
2035 | struct peer *const peer = args->peer; |
2036 | struct attr *const attr = args->attr; | |
2037 | const bgp_size_t length = args->length; | |
b881c707 | 2038 | |
718e3744 | 2039 | if (length == 0) |
fb982c25 PJ |
2040 | { |
2041 | if (attr->extra) | |
2042 | attr->extra->ecommunity = NULL; | |
0c466381 | 2043 | /* Empty extcomm doesn't seem to be invalid per se */ |
b881c707 | 2044 | return BGP_ATTR_PARSE_PROCEED; |
fb982c25 | 2045 | } |
0c466381 PJ |
2046 | |
2047 | (bgp_attr_extra_get (attr))->ecommunity = | |
2048 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
2049 | /* XXX: fix ecommunity_parse to use stream API */ | |
2050 | stream_forward_getp (peer->ibuf, length); | |
2051 | ||
2052 | if (!attr->extra->ecommunity) | |
835315bf PJ |
2053 | return bgp_attr_malformed (args, |
2054 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2055 | args->total); | |
0c466381 | 2056 | |
718e3744 | 2057 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); |
2058 | ||
b881c707 | 2059 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2060 | } |
2061 | ||
f4c89855 LB |
2062 | /* Parse Tunnel Encap attribute in an UPDATE */ |
2063 | static int | |
2064 | bgp_attr_encap( | |
2065 | uint8_t type, | |
2066 | struct peer *peer, /* IN */ | |
2067 | bgp_size_t length, /* IN: attr's length field */ | |
2068 | struct attr *attr, /* IN: caller already allocated */ | |
2069 | u_char flag, /* IN: attr's flags field */ | |
2070 | u_char *startp) | |
2071 | { | |
2072 | bgp_size_t total; | |
2073 | struct attr_extra *attre = NULL; | |
2074 | struct bgp_attr_encap_subtlv *stlv_last = NULL; | |
2de1475f | 2075 | uint16_t tunneltype = 0; |
f4c89855 LB |
2076 | |
2077 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2078 | ||
2079 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2080 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) | |
2081 | { | |
2082 | zlog_info ("Tunnel Encap attribute flag isn't optional and transitive %d", flag); | |
2083 | bgp_notify_send_with_data (peer, | |
2084 | BGP_NOTIFY_UPDATE_ERR, | |
2085 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2086 | startp, total); | |
2087 | return -1; | |
2088 | } | |
2089 | ||
2090 | if (BGP_ATTR_ENCAP == type) { | |
2091 | /* read outer TLV type and length */ | |
2092 | uint16_t tlv_length; | |
2093 | ||
2094 | if (length < 4) { | |
2095 | zlog_info ("Tunnel Encap attribute not long enough to contain outer T,L"); | |
2096 | bgp_notify_send_with_data(peer, | |
2097 | BGP_NOTIFY_UPDATE_ERR, | |
2098 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2099 | startp, total); | |
2100 | return -1; | |
2101 | } | |
2102 | tunneltype = stream_getw (BGP_INPUT (peer)); | |
2103 | tlv_length = stream_getw (BGP_INPUT (peer)); | |
2104 | length -= 4; | |
2105 | ||
2106 | if (tlv_length != length) { | |
2107 | zlog_info ("%s: tlv_length(%d) != length(%d)", | |
2108 | __func__, tlv_length, length); | |
2109 | } | |
2110 | } | |
2111 | ||
2112 | while (length >= 4) { | |
0f2b4f4d | 2113 | uint16_t subtype = 0; |
f4cafc65 | 2114 | uint16_t sublength = 0; |
f4c89855 LB |
2115 | struct bgp_attr_encap_subtlv *tlv; |
2116 | ||
587ff0fd LB |
2117 | if (BGP_ATTR_ENCAP == type) { |
2118 | subtype = stream_getc (BGP_INPUT (peer)); | |
2119 | sublength = stream_getc (BGP_INPUT (peer)); | |
2120 | length -= 2; | |
65efcfce LB |
2121 | #if ENABLE_BGP_VNC |
2122 | } else { | |
2123 | subtype = stream_getw (BGP_INPUT (peer)); | |
2124 | sublength = stream_getw (BGP_INPUT (peer)); | |
2125 | length -= 4; | |
2126 | #endif | |
587ff0fd | 2127 | } |
f4c89855 LB |
2128 | |
2129 | if (sublength > length) { | |
2130 | zlog_info ("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2131 | sublength, length); | |
2132 | bgp_notify_send_with_data (peer, | |
2133 | BGP_NOTIFY_UPDATE_ERR, | |
2134 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2135 | startp, total); | |
2136 | return -1; | |
2137 | } | |
2138 | ||
2139 | /* alloc and copy sub-tlv */ | |
2140 | /* TBD make sure these are freed when attributes are released */ | |
2141 | tlv = XCALLOC (MTYPE_ENCAP_TLV, sizeof(struct bgp_attr_encap_subtlv)-1+sublength); | |
2142 | tlv->type = subtype; | |
2143 | tlv->length = sublength; | |
2144 | stream_get(tlv->value, peer->ibuf, sublength); | |
2145 | length -= sublength; | |
2146 | ||
2147 | /* attach tlv to encap chain */ | |
2148 | if (!attre) { | |
2149 | attre = bgp_attr_extra_get(attr); | |
2150 | if (BGP_ATTR_ENCAP == type) { | |
2151 | for (stlv_last = attre->encap_subtlvs; stlv_last && stlv_last->next; | |
2152 | stlv_last = stlv_last->next); | |
2153 | if (stlv_last) { | |
2154 | stlv_last->next = tlv; | |
2155 | } else { | |
2156 | attre->encap_subtlvs = tlv; | |
2157 | } | |
65efcfce LB |
2158 | #if ENABLE_BGP_VNC |
2159 | } else { | |
2160 | for (stlv_last = attre->vnc_subtlvs; stlv_last && stlv_last->next; | |
2161 | stlv_last = stlv_last->next); | |
2162 | if (stlv_last) { | |
2163 | stlv_last->next = tlv; | |
2164 | } else { | |
2165 | attre->vnc_subtlvs = tlv; | |
2166 | } | |
2167 | #endif | |
f4c89855 LB |
2168 | } |
2169 | } else { | |
2170 | stlv_last->next = tlv; | |
2171 | } | |
2172 | stlv_last = tlv; | |
2173 | } | |
2174 | ||
2175 | if (attre && (BGP_ATTR_ENCAP == type)) { | |
2176 | attre->encap_tunneltype = tunneltype; | |
2177 | } | |
2178 | ||
2179 | if (length) { | |
2180 | /* spurious leftover data */ | |
2181 | zlog_info ("Tunnel Encap attribute length is bad: %d leftover octets", length); | |
2182 | bgp_notify_send_with_data (peer, | |
2183 | BGP_NOTIFY_UPDATE_ERR, | |
2184 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2185 | startp, total); | |
2186 | return -1; | |
2187 | } | |
2188 | ||
2189 | return 0; | |
2190 | } | |
2191 | ||
718e3744 | 2192 | /* BGP unknown attribute treatment. */ |
b881c707 | 2193 | static bgp_attr_parse_ret_t |
835315bf | 2194 | bgp_attr_unknown (struct bgp_attr_parser_args *args) |
718e3744 | 2195 | { |
8794e8d2 | 2196 | bgp_size_t total = args->total; |
718e3744 | 2197 | struct transit *transit; |
fb982c25 | 2198 | struct attr_extra *attre; |
835315bf PJ |
2199 | struct peer *const peer = args->peer; |
2200 | struct attr *const attr = args->attr; | |
2201 | u_char *const startp = args->startp; | |
2202 | const u_char type = args->type; | |
2203 | const u_char flag = args->flags; | |
2204 | const bgp_size_t length = args->length; | |
2205 | ||
3f9c7369 | 2206 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
16286195 DS |
2207 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", |
2208 | peer->host, type, length); | |
f418446b | 2209 | |
718e3744 | 2210 | /* Forward read pointer of input stream. */ |
9985f83c | 2211 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 2212 | |
718e3744 | 2213 | /* If any of the mandatory well-known attributes are not recognized, |
2214 | then the Error Subcode is set to Unrecognized Well-known | |
2215 | Attribute. The Data field contains the unrecognized attribute | |
2216 | (type, length and value). */ | |
b881c707 | 2217 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) |
718e3744 | 2218 | { |
835315bf | 2219 | return bgp_attr_malformed (args, |
b881c707 | 2220 | BGP_NOTIFY_UPDATE_UNREC_ATTR, |
835315bf | 2221 | args->total); |
718e3744 | 2222 | } |
2223 | ||
2224 | /* Unrecognized non-transitive optional attributes must be quietly | |
2225 | ignored and not passed along to other BGP peers. */ | |
2226 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
b881c707 | 2227 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2228 | |
2229 | /* If a path with recognized transitive optional attribute is | |
2230 | accepted and passed along to other BGP peers and the Partial bit | |
2231 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2232 | is not set back to 0 by the current AS. */ | |
2233 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
2234 | ||
2235 | /* Store transitive attribute to the end of attr->transit. */ | |
fb982c25 | 2236 | if (! ((attre = bgp_attr_extra_get(attr))->transit) ) |
393deb9b | 2237 | attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); |
718e3744 | 2238 | |
fb982c25 | 2239 | transit = attre->transit; |
718e3744 | 2240 | |
2241 | if (transit->val) | |
2242 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
2243 | transit->length + total); | |
2244 | else | |
2245 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
2246 | ||
2247 | memcpy (transit->val + transit->length, startp, total); | |
2248 | transit->length += total; | |
2249 | ||
b881c707 | 2250 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2251 | } |
2252 | ||
bb7bef14 PJ |
2253 | /* Well-known attribute check. */ |
2254 | static int | |
52a51fd3 | 2255 | bgp_attr_check (struct peer *peer, struct attr *attr) |
bb7bef14 PJ |
2256 | { |
2257 | u_char type = 0; | |
2258 | ||
67495ddb PJ |
2259 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an |
2260 | * empty UPDATE. */ | |
2261 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2262 | return BGP_ATTR_PARSE_PROCEED; | |
2263 | ||
2264 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2265 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2266 | are present, it should. Check for any other attribute being present | |
2267 | instead. | |
2268 | */ | |
2269 | if (attr->flag == ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI)) | |
2270 | return BGP_ATTR_PARSE_PROCEED; | |
2271 | ||
bb7bef14 PJ |
2272 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) |
2273 | type = BGP_ATTR_ORIGIN; | |
2274 | ||
2275 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
2276 | type = BGP_ATTR_AS_PATH; | |
2277 | ||
52a51fd3 DW |
2278 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present and |
2279 | * NLRI is empty. We can't easily check NLRI empty here though. | |
bb7bef14 | 2280 | */ |
52a51fd3 DW |
2281 | if (!CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
2282 | && !CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI))) | |
2283 | type = BGP_ATTR_NEXT_HOP; | |
bb7bef14 PJ |
2284 | |
2285 | if (peer->sort == BGP_PEER_IBGP | |
2286 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
2287 | type = BGP_ATTR_LOCAL_PREF; | |
2288 | ||
2289 | if (type) | |
2290 | { | |
52a51fd3 DW |
2291 | zlog_warn ("%s Missing well-known attribute %s.", peer->host, |
2292 | LOOKUP (attr_str, type)); | |
bb7bef14 PJ |
2293 | bgp_notify_send_with_data (peer, |
2294 | BGP_NOTIFY_UPDATE_ERR, | |
2295 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
2296 | &type, 1); | |
2297 | return BGP_ATTR_PARSE_ERROR; | |
2298 | } | |
2299 | return BGP_ATTR_PARSE_PROCEED; | |
2300 | } | |
2301 | ||
718e3744 | 2302 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2303 | bgp_update_receive() in bgp_packet.c. */ |
b881c707 | 2304 | bgp_attr_parse_ret_t |
718e3744 | 2305 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, |
52a51fd3 | 2306 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) |
718e3744 | 2307 | { |
2308 | int ret; | |
b881c707 | 2309 | u_char flag = 0; |
0b2aa3a0 | 2310 | u_char type = 0; |
718e3744 | 2311 | bgp_size_t length; |
2312 | u_char *startp, *endp; | |
2313 | u_char *attr_endp; | |
2314 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
2315 | /* we need the as4_path only until we have synthesized the as_path with it */ |
2316 | /* same goes for as4_aggregator */ | |
2317 | struct aspath *as4_path = NULL; | |
2318 | as_t as4_aggregator = 0; | |
19c3598b | 2319 | struct in_addr as4_aggregator_addr = { .s_addr = 0 }; |
718e3744 | 2320 | |
2321 | /* Initialize bitmap. */ | |
2322 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2323 | ||
2324 | /* End pointer of BGP attribute. */ | |
2325 | endp = BGP_INPUT_PNT (peer) + size; | |
b881c707 | 2326 | |
718e3744 | 2327 | /* Get attributes to the end of attribute length. */ |
2328 | while (BGP_INPUT_PNT (peer) < endp) | |
2329 | { | |
2330 | /* Check remaining length check.*/ | |
2331 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
2332 | { | |
c29fdba7 | 2333 | /* XXX warning: long int format, int arg (arg 5) */ |
16286195 DS |
2334 | zlog_warn ("%s: error BGP attribute length %lu is smaller than min len", |
2335 | peer->host, | |
2336 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 2337 | |
2338 | bgp_notify_send (peer, | |
2339 | BGP_NOTIFY_UPDATE_ERR, | |
2340 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2341 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2342 | } |
2343 | ||
2344 | /* Fetch attribute flag and type. */ | |
2345 | startp = BGP_INPUT_PNT (peer); | |
2d42e68a DO |
2346 | /* "The lower-order four bits of the Attribute Flags octet are |
2347 | unused. They MUST be zero when sent and MUST be ignored when | |
2348 | received." */ | |
2349 | flag = 0xF0 & stream_getc (BGP_INPUT (peer)); | |
718e3744 | 2350 | type = stream_getc (BGP_INPUT (peer)); |
2351 | ||
370b64a2 PJ |
2352 | /* Check whether Extended-Length applies and is in bounds */ |
2353 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
2354 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
2355 | { | |
16286195 DS |
2356 | zlog_warn ("%s: Extended length set, but just %lu bytes of attr header", |
2357 | peer->host, | |
2358 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
370b64a2 PJ |
2359 | |
2360 | bgp_notify_send (peer, | |
2361 | BGP_NOTIFY_UPDATE_ERR, | |
2362 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2363 | return BGP_ATTR_PARSE_ERROR; |
370b64a2 | 2364 | } |
835315bf | 2365 | |
718e3744 | 2366 | /* Check extended attribue length bit. */ |
2367 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
2368 | length = stream_getw (BGP_INPUT (peer)); | |
2369 | else | |
2370 | length = stream_getc (BGP_INPUT (peer)); | |
2371 | ||
2372 | /* If any attribute appears more than once in the UPDATE | |
2373 | message, then the Error Subcode is set to Malformed Attribute | |
2374 | List. */ | |
2375 | ||
2376 | if (CHECK_BITMAP (seen, type)) | |
2377 | { | |
16286195 DS |
2378 | zlog_warn ("%s: error BGP attribute type %d appears twice in a message", |
2379 | peer->host, type); | |
718e3744 | 2380 | |
2381 | bgp_notify_send (peer, | |
2382 | BGP_NOTIFY_UPDATE_ERR, | |
2383 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 | 2384 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2385 | } |
2386 | ||
2387 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2388 | unsigned char so it never overflow bitmap range. */ | |
2389 | ||
2390 | SET_BITMAP (seen, type); | |
2391 | ||
2392 | /* Overflow check. */ | |
2393 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
2394 | ||
2395 | if (attr_endp > endp) | |
2396 | { | |
16286195 | 2397 | zlog_warn ("%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", peer->host, type, length, size, attr_endp, endp); |
b184ccd8 DS |
2398 | bgp_notify_send_with_data (peer, |
2399 | BGP_NOTIFY_UPDATE_ERR, | |
2400 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2401 | startp, attr_endp - startp); | |
b881c707 | 2402 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2403 | } |
835315bf PJ |
2404 | |
2405 | struct bgp_attr_parser_args attr_args = { | |
2406 | .peer = peer, | |
2407 | .length = length, | |
2408 | .attr = attr, | |
2409 | .type = type, | |
2410 | .flags = flag, | |
2411 | .startp = startp, | |
2412 | .total = attr_endp - startp, | |
2413 | }; | |
2414 | ||
2415 | ||
2416 | /* If any recognized attribute has Attribute Flags that conflict | |
2417 | with the Attribute Type Code, then the Error Subcode is set to | |
2418 | Attribute Flags Error. The Data field contains the erroneous | |
2419 | attribute (type, length and value). */ | |
2420 | if (bgp_attr_flag_invalid (&attr_args)) | |
fa61e16d PJ |
2421 | { |
2422 | bgp_attr_parse_ret_t ret; | |
2423 | ret = bgp_attr_malformed (&attr_args, | |
2424 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2425 | attr_args.total); | |
2426 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2427 | continue; | |
2428 | return ret; | |
2429 | } | |
718e3744 | 2430 | |
2431 | /* OK check attribute and store it's value. */ | |
2432 | switch (type) | |
2433 | { | |
2434 | case BGP_ATTR_ORIGIN: | |
835315bf | 2435 | ret = bgp_attr_origin (&attr_args); |
718e3744 | 2436 | break; |
2437 | case BGP_ATTR_AS_PATH: | |
835315bf | 2438 | ret = bgp_attr_aspath (&attr_args); |
718e3744 | 2439 | break; |
0b2aa3a0 | 2440 | case BGP_ATTR_AS4_PATH: |
835315bf | 2441 | ret = bgp_attr_as4_path (&attr_args, &as4_path); |
0b2aa3a0 | 2442 | break; |
718e3744 | 2443 | case BGP_ATTR_NEXT_HOP: |
835315bf | 2444 | ret = bgp_attr_nexthop (&attr_args); |
718e3744 | 2445 | break; |
2446 | case BGP_ATTR_MULTI_EXIT_DISC: | |
835315bf | 2447 | ret = bgp_attr_med (&attr_args); |
718e3744 | 2448 | break; |
2449 | case BGP_ATTR_LOCAL_PREF: | |
835315bf | 2450 | ret = bgp_attr_local_pref (&attr_args); |
718e3744 | 2451 | break; |
2452 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
835315bf | 2453 | ret = bgp_attr_atomic (&attr_args); |
718e3744 | 2454 | break; |
2455 | case BGP_ATTR_AGGREGATOR: | |
835315bf | 2456 | ret = bgp_attr_aggregator (&attr_args); |
718e3744 | 2457 | break; |
0b2aa3a0 | 2458 | case BGP_ATTR_AS4_AGGREGATOR: |
835315bf PJ |
2459 | ret = bgp_attr_as4_aggregator (&attr_args, |
2460 | &as4_aggregator, | |
2461 | &as4_aggregator_addr); | |
0b2aa3a0 | 2462 | break; |
718e3744 | 2463 | case BGP_ATTR_COMMUNITIES: |
835315bf | 2464 | ret = bgp_attr_community (&attr_args); |
718e3744 | 2465 | break; |
2466 | case BGP_ATTR_ORIGINATOR_ID: | |
835315bf | 2467 | ret = bgp_attr_originator_id (&attr_args); |
718e3744 | 2468 | break; |
2469 | case BGP_ATTR_CLUSTER_LIST: | |
835315bf | 2470 | ret = bgp_attr_cluster_list (&attr_args); |
718e3744 | 2471 | break; |
2472 | case BGP_ATTR_MP_REACH_NLRI: | |
835315bf | 2473 | ret = bgp_mp_reach_parse (&attr_args, mp_update); |
718e3744 | 2474 | break; |
2475 | case BGP_ATTR_MP_UNREACH_NLRI: | |
835315bf | 2476 | ret = bgp_mp_unreach_parse (&attr_args, mp_withdraw); |
718e3744 | 2477 | break; |
2478 | case BGP_ATTR_EXT_COMMUNITIES: | |
835315bf | 2479 | ret = bgp_attr_ext_communities (&attr_args); |
718e3744 | 2480 | break; |
65efcfce LB |
2481 | #if ENABLE_BGP_VNC |
2482 | case BGP_ATTR_VNC: | |
2483 | #endif | |
f4c89855 LB |
2484 | case BGP_ATTR_ENCAP: |
2485 | ret = bgp_attr_encap (type, peer, length, attr, flag, startp); | |
2486 | break; | |
718e3744 | 2487 | default: |
835315bf | 2488 | ret = bgp_attr_unknown (&attr_args); |
718e3744 | 2489 | break; |
2490 | } | |
b881c707 | 2491 | |
f57000c0 DL |
2492 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) |
2493 | { | |
2494 | bgp_notify_send (peer, | |
2495 | BGP_NOTIFY_UPDATE_ERR, | |
2496 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2497 | ret = BGP_ATTR_PARSE_ERROR; | |
2498 | } | |
2499 | ||
b881c707 PJ |
2500 | /* If hard error occured immediately return to the caller. */ |
2501 | if (ret == BGP_ATTR_PARSE_ERROR) | |
6e4ab12f | 2502 | { |
16286195 DS |
2503 | zlog_warn ("%s: Attribute %s, parse error", |
2504 | peer->host, | |
2505 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2506 | if (as4_path) |
2507 | aspath_unintern (&as4_path); | |
2508 | return ret; | |
6e4ab12f | 2509 | } |
b881c707 PJ |
2510 | if (ret == BGP_ATTR_PARSE_WITHDRAW) |
2511 | { | |
2512 | ||
16286195 DS |
2513 | zlog_warn ("%s: Attribute %s, parse error - treating as withdrawal", |
2514 | peer->host, | |
2515 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2516 | if (as4_path) |
2517 | aspath_unintern (&as4_path); | |
2518 | return ret; | |
2519 | } | |
2520 | ||
718e3744 | 2521 | /* Check the fetched length. */ |
2522 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
2523 | { | |
16286195 DS |
2524 | zlog_warn ("%s: BGP attribute %s, fetch error", |
2525 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2526 | bgp_notify_send (peer, |
2527 | BGP_NOTIFY_UPDATE_ERR, | |
2528 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2529 | if (as4_path) |
2530 | aspath_unintern (&as4_path); | |
2531 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2532 | } |
2533 | } | |
2534 | ||
2535 | /* Check final read pointer is same as end pointer. */ | |
2536 | if (BGP_INPUT_PNT (peer) != endp) | |
2537 | { | |
16286195 DS |
2538 | zlog_warn ("%s: BGP attribute %s, length mismatch", |
2539 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2540 | bgp_notify_send (peer, |
2541 | BGP_NOTIFY_UPDATE_ERR, | |
2542 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2543 | if (as4_path) |
2544 | aspath_unintern (&as4_path); | |
2545 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2546 | } |
2547 | ||
bb7bef14 PJ |
2548 | /* Check all mandatory well-known attributes are present */ |
2549 | { | |
2550 | bgp_attr_parse_ret_t ret; | |
52a51fd3 | 2551 | if ((ret = bgp_attr_check (peer, attr)) < 0) |
bb7bef14 PJ |
2552 | { |
2553 | if (as4_path) | |
2554 | aspath_unintern (&as4_path); | |
2555 | return ret; | |
2556 | } | |
2557 | } | |
2558 | ||
0b2aa3a0 PJ |
2559 | /* |
2560 | * At this place we can see whether we got AS4_PATH and/or | |
2561 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2562 | * We can not do this before we've read all attributes because | |
2563 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2564 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2565 | * in relationship to AGGREGATOR. | |
2566 | * So, to be defensive, we are not relying on any order and read | |
2567 | * all attributes first, including these 32bit ones, and now, | |
2568 | * afterwards, we look what and if something is to be done for as4. | |
67495ddb PJ |
2569 | * |
2570 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2571 | * MP_UNREACH_NLRI. | |
0b2aa3a0 | 2572 | */ |
f57000c0 DL |
2573 | /* actually... this doesn't ever return failure currently, but |
2574 | * better safe than sorry */ | |
67495ddb PJ |
2575 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)) |
2576 | && bgp_attr_munge_as4_attrs (peer, attr, as4_path, | |
0b2aa3a0 | 2577 | as4_aggregator, &as4_aggregator_addr)) |
b881c707 | 2578 | { |
f57000c0 DL |
2579 | bgp_notify_send (peer, |
2580 | BGP_NOTIFY_UPDATE_ERR, | |
2581 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 PJ |
2582 | if (as4_path) |
2583 | aspath_unintern (&as4_path); | |
2584 | return BGP_ATTR_PARSE_ERROR; | |
2585 | } | |
0b2aa3a0 PJ |
2586 | |
2587 | /* At this stage, we have done all fiddling with as4, and the | |
2588 | * resulting info is in attr->aggregator resp. attr->aspath | |
2589 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2590 | * order to save memory | |
2591 | */ | |
b881c707 | 2592 | if (as4_path) |
0b2aa3a0 | 2593 | { |
f6f434b2 | 2594 | aspath_unintern (&as4_path); /* unintern - it is in the hash */ |
0b2aa3a0 PJ |
2595 | /* The flag that we got this is still there, but that does not |
2596 | * do any trouble | |
2597 | */ | |
2598 | } | |
2599 | /* | |
2600 | * The "rest" of the code does nothing with as4_aggregator. | |
2601 | * there is no memory attached specifically which is not part | |
2602 | * of the attr. | |
2603 | * so ignoring just means do nothing. | |
2604 | */ | |
2605 | /* | |
2606 | * Finally do the checks on the aspath we did not do yet | |
2607 | * because we waited for a potentially synthesized aspath. | |
2608 | */ | |
b881c707 | 2609 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) |
0b2aa3a0 | 2610 | { |
835315bf | 2611 | ret = bgp_attr_aspath_check (peer, attr); |
b881c707 | 2612 | if (ret != BGP_ATTR_PARSE_PROCEED) |
0b2aa3a0 PJ |
2613 | return ret; |
2614 | } | |
bede7744 LB |
2615 | if (attr->extra) |
2616 | { | |
2617 | /* Finally intern unknown attribute. */ | |
2618 | if (attr->extra->transit) | |
2619 | attr->extra->transit = transit_intern (attr->extra->transit); | |
2620 | if (attr->extra->encap_subtlvs) | |
2621 | attr->extra->encap_subtlvs = encap_intern (attr->extra->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
2622 | #if ENABLE_BGP_VNC | |
2623 | if (attr->extra->vnc_subtlvs) | |
2624 | attr->extra->vnc_subtlvs = encap_intern (attr->extra->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
2625 | #endif | |
2626 | } | |
718e3744 | 2627 | |
b881c707 | 2628 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2629 | } |
2630 | ||
8c71e481 | 2631 | size_t |
8a92a8a0 | 2632 | bgp_packet_mpattr_start (struct stream *s, afi_t afi, safi_t safi, afi_t nh_afi, |
3f9c7369 | 2633 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 PM |
2634 | struct attr *attr) |
2635 | { | |
2636 | size_t sizep; | |
2637 | ||
2638 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2639 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2640 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
2641 | sizep = stream_get_endp (s); | |
2642 | stream_putw (s, 0); /* Marker: Attribute length. */ | |
93b73dfa LB |
2643 | |
2644 | stream_putw (s, afi); | |
2645 | stream_putc (s, (safi == SAFI_MPLS_VPN) ? SAFI_MPLS_LABELED_VPN : safi); | |
8c71e481 PM |
2646 | |
2647 | /* Nexthop */ | |
8a92a8a0 | 2648 | switch (nh_afi) |
8c71e481 PM |
2649 | { |
2650 | case AFI_IP: | |
2651 | switch (safi) | |
2652 | { | |
6407da5a | 2653 | case SAFI_UNICAST: |
8c71e481 | 2654 | case SAFI_MULTICAST: |
3f9c7369 | 2655 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 PM |
2656 | stream_putc (s, 4); |
2657 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2658 | break; | |
2659 | case SAFI_MPLS_VPN: | |
3f9c7369 | 2660 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 | 2661 | stream_putc (s, 12); |
93b73dfa | 2662 | stream_putl (s, 0); /* RD = 0, per RFC */ |
8c71e481 PM |
2663 | stream_putl (s, 0); |
2664 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2665 | break; | |
587ff0fd LB |
2666 | case SAFI_ENCAP: |
2667 | stream_putc (s, 4); | |
2668 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2669 | break; | |
8c71e481 PM |
2670 | default: |
2671 | break; | |
2672 | } | |
2673 | break; | |
2674 | #ifdef HAVE_IPV6 | |
2675 | case AFI_IP6: | |
2676 | switch (safi) | |
2677 | { | |
2678 | case SAFI_UNICAST: | |
2679 | case SAFI_MULTICAST: | |
2680 | { | |
8c71e481 PM |
2681 | struct attr_extra *attre = attr->extra; |
2682 | ||
2683 | assert (attr->extra); | |
3f9c7369 | 2684 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 | 2685 | stream_putc (s, attre->mp_nexthop_len); |
801a9bcc DS |
2686 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2687 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
2688 | stream_put (s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
8c71e481 | 2689 | } |
93b73dfa LB |
2690 | break; |
2691 | case SAFI_MPLS_VPN: | |
2692 | { | |
2693 | struct attr_extra *attre = attr->extra; | |
2694 | ||
2695 | assert (attr->extra); | |
6407da5a | 2696 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL) { |
93b73dfa LB |
2697 | stream_putc (s, 24); |
2698 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2699 | stream_putl (s, 0); | |
6407da5a | 2700 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2701 | } else if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
93b73dfa LB |
2702 | stream_putc (s, 48); |
2703 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2704 | stream_putl (s, 0); | |
6407da5a | 2705 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2706 | stream_putl (s, 0); /* RD = 0, per RFC */ |
2707 | stream_putl (s, 0); | |
6407da5a | 2708 | stream_put (s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2709 | } |
2710 | } | |
2711 | break; | |
587ff0fd LB |
2712 | case SAFI_ENCAP: |
2713 | assert (attr->extra); | |
2714 | stream_putc (s, IPV6_MAX_BYTELEN); | |
2715 | stream_put (s, &attr->extra->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
2716 | break; | |
8c71e481 PM |
2717 | default: |
2718 | break; | |
2719 | } | |
2720 | break; | |
2721 | #endif /*HAVE_IPV6*/ | |
2722 | default: | |
2723 | break; | |
2724 | } | |
2725 | ||
2726 | /* SNPA */ | |
2727 | stream_putc (s, 0); | |
2728 | return sizep; | |
2729 | } | |
2730 | ||
2731 | void | |
2732 | bgp_packet_mpattr_prefix (struct stream *s, afi_t afi, safi_t safi, | |
2733 | struct prefix *p, struct prefix_rd *prd, | |
adbac85e DW |
2734 | u_char *tag, int addpath_encode, |
2735 | u_int32_t addpath_tx_id) | |
8c71e481 | 2736 | { |
93b73dfa | 2737 | if (safi == SAFI_MPLS_VPN) |
8c71e481 | 2738 | { |
adbac85e DW |
2739 | if (addpath_encode) |
2740 | stream_putl(s, addpath_tx_id); | |
8c71e481 PM |
2741 | /* Tag, RD, Prefix write. */ |
2742 | stream_putc (s, p->prefixlen + 88); | |
2743 | stream_put (s, tag, 3); | |
2744 | stream_put (s, prd->val, 8); | |
2745 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
8c71e481 | 2746 | } |
93b73dfa LB |
2747 | else |
2748 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); | |
2749 | } | |
2750 | ||
2751 | size_t | |
2752 | bgp_packet_mpattr_prefix_size (afi_t afi, safi_t safi, struct prefix *p) | |
2753 | { | |
2754 | int size = PSIZE (p->prefixlen); | |
2755 | if (safi == SAFI_MPLS_VPN) | |
2756 | size += 88; | |
2757 | return size; | |
8c71e481 PM |
2758 | } |
2759 | ||
f4c89855 | 2760 | /* |
65efcfce LB |
2761 | * Encodes the tunnel encapsulation attribute, |
2762 | * and with ENABLE_BGP_VNC the VNC attribute which uses | |
2763 | * almost the same TLV format | |
f4c89855 LB |
2764 | */ |
2765 | static void | |
2766 | bgp_packet_mpattr_tea( | |
2767 | struct bgp *bgp, | |
2768 | struct peer *peer, | |
2769 | struct stream *s, | |
2770 | struct attr *attr, | |
2771 | uint8_t attrtype) | |
2772 | { | |
2773 | unsigned int attrlenfield = 0; | |
587ff0fd | 2774 | unsigned int attrhdrlen = 0; |
f4c89855 LB |
2775 | struct bgp_attr_encap_subtlv *subtlvs; |
2776 | struct bgp_attr_encap_subtlv *st; | |
2777 | const char *attrname; | |
2778 | ||
2779 | if (!attr || !attr->extra) | |
2780 | return; | |
2781 | ||
2782 | switch (attrtype) { | |
2783 | case BGP_ATTR_ENCAP: | |
2784 | attrname = "Tunnel Encap"; | |
2785 | subtlvs = attr->extra->encap_subtlvs; | |
2786 | ||
2787 | /* | |
2788 | * The tunnel encap attr has an "outer" tlv. | |
2789 | * T = tunneltype, | |
2790 | * L = total length of subtlvs, | |
2791 | * V = concatenated subtlvs. | |
2792 | */ | |
2793 | attrlenfield = 2 + 2; /* T + L */ | |
587ff0fd | 2794 | attrhdrlen = 1 + 1; /* subTLV T + L */ |
f4c89855 LB |
2795 | break; |
2796 | ||
65efcfce LB |
2797 | #if ENABLE_BGP_VNC |
2798 | case BGP_ATTR_VNC: | |
2799 | attrname = "VNC"; | |
2800 | subtlvs = attr->extra->vnc_subtlvs; | |
2801 | attrlenfield = 0; /* no outer T + L */ | |
2802 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2803 | break; | |
2804 | #endif | |
2805 | ||
f4c89855 LB |
2806 | default: |
2807 | assert(0); | |
2808 | } | |
2809 | ||
2810 | ||
587ff0fd LB |
2811 | /* if no tlvs, don't make attr */ |
2812 | if (subtlvs == NULL) | |
2813 | return; | |
2814 | ||
f4c89855 LB |
2815 | /* compute attr length */ |
2816 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd | 2817 | attrlenfield += (attrhdrlen + st->length); |
f4c89855 LB |
2818 | } |
2819 | ||
f4c89855 LB |
2820 | if (attrlenfield > 0xffff) { |
2821 | zlog_info ("%s attribute is too long (length=%d), can't send it", | |
2822 | attrname, | |
2823 | attrlenfield); | |
2824 | return; | |
2825 | } | |
2826 | ||
2827 | if (attrlenfield > 0xff) { | |
2828 | /* 2-octet length field */ | |
2829 | stream_putc (s, | |
2830 | BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2831 | stream_putc (s, attrtype); | |
2832 | stream_putw (s, attrlenfield & 0xffff); | |
2833 | } else { | |
2834 | /* 1-octet length field */ | |
2835 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL); | |
2836 | stream_putc (s, attrtype); | |
2837 | stream_putc (s, attrlenfield & 0xff); | |
2838 | } | |
2839 | ||
2840 | if (attrtype == BGP_ATTR_ENCAP) { | |
2841 | /* write outer T+L */ | |
2842 | stream_putw(s, attr->extra->encap_tunneltype); | |
2843 | stream_putw(s, attrlenfield - 4); | |
2844 | } | |
2845 | ||
2846 | /* write each sub-tlv */ | |
2847 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd LB |
2848 | if (attrtype == BGP_ATTR_ENCAP) { |
2849 | stream_putc (s, st->type); | |
2850 | stream_putc (s, st->length); | |
65efcfce LB |
2851 | #if ENABLE_BGP_VNC |
2852 | } else { | |
2853 | stream_putw (s, st->type); | |
2854 | stream_putw (s, st->length); | |
2855 | #endif | |
587ff0fd | 2856 | } |
f4c89855 LB |
2857 | stream_put (s, st->value, st->length); |
2858 | } | |
2859 | } | |
f4c89855 | 2860 | |
8c71e481 PM |
2861 | void |
2862 | bgp_packet_mpattr_end (struct stream *s, size_t sizep) | |
2863 | { | |
2864 | /* Set MP attribute length. Don't count the (2) bytes used to encode | |
2865 | the attr length */ | |
2866 | stream_putw_at (s, sizep, (stream_get_endp (s) - sizep) - 2); | |
2867 | } | |
2868 | ||
718e3744 | 2869 | /* Make attribute packet. */ |
2870 | bgp_size_t | |
2871 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
8c71e481 | 2872 | struct stream *s, struct attr *attr, |
3f9c7369 | 2873 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 | 2874 | struct prefix *p, afi_t afi, safi_t safi, |
adbac85e DW |
2875 | struct peer *from, struct prefix_rd *prd, u_char *tag, |
2876 | int addpath_encode, | |
2877 | u_int32_t addpath_tx_id) | |
718e3744 | 2878 | { |
fe69a505 | 2879 | size_t cp; |
0b2aa3a0 | 2880 | size_t aspath_sizep; |
718e3744 | 2881 | struct aspath *aspath; |
0b2aa3a0 PJ |
2882 | int send_as4_path = 0; |
2883 | int send_as4_aggregator = 0; | |
2884 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
718e3744 | 2885 | |
2886 | if (! bgp) | |
75aead62 | 2887 | bgp = peer->bgp; |
718e3744 | 2888 | |
2889 | /* Remember current pointer. */ | |
9985f83c | 2890 | cp = stream_get_endp (s); |
718e3744 | 2891 | |
8a92a8a0 DS |
2892 | if (p && !((afi == AFI_IP && safi == SAFI_UNICAST) && |
2893 | !peer_cap_enhe(peer))) | |
8c71e481 | 2894 | { |
93b73dfa LB |
2895 | size_t mpattrlen_pos = 0; |
2896 | ||
8a92a8a0 DS |
2897 | mpattrlen_pos = bgp_packet_mpattr_start(s, afi, safi, |
2898 | (peer_cap_enhe(peer) ? AFI_IP6 : afi), | |
2899 | vecarr, attr); | |
adbac85e DW |
2900 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, tag, |
2901 | addpath_encode, addpath_tx_id); | |
8c71e481 PM |
2902 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
2903 | } | |
2904 | ||
718e3744 | 2905 | /* Origin attribute. */ |
2906 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2907 | stream_putc (s, BGP_ATTR_ORIGIN); | |
2908 | stream_putc (s, 1); | |
2909 | stream_putc (s, attr->origin); | |
2910 | ||
2911 | /* AS path attribute. */ | |
2912 | ||
2913 | /* If remote-peer is EBGP */ | |
6d85b15b | 2914 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 2915 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) |
fe69a505 | 2916 | || attr->aspath->segments == NULL) |
fee0f4c6 | 2917 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 2918 | { |
2919 | aspath = aspath_dup (attr->aspath); | |
2920 | ||
66b199b2 DS |
2921 | /* Even though we may not be configured for confederations we may have |
2922 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
2923 | aspath = aspath_delete_confed_seq (aspath); | |
2924 | ||
718e3744 | 2925 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) |
2926 | { | |
66b199b2 | 2927 | /* Stuff our path CONFED_ID on the front */ |
718e3744 | 2928 | aspath = aspath_add_seq (aspath, bgp->confed_id); |
2929 | } | |
2930 | else | |
2931 | { | |
9d3f9705 AC |
2932 | if (peer->change_local_as) { |
2933 | /* If replace-as is specified, we only use the change_local_as when | |
2934 | advertising routes. */ | |
2935 | if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) { | |
2936 | aspath = aspath_add_seq (aspath, peer->local_as); | |
2937 | } | |
718e3744 | 2938 | aspath = aspath_add_seq (aspath, peer->change_local_as); |
9d3f9705 AC |
2939 | } else { |
2940 | aspath = aspath_add_seq (aspath, peer->local_as); | |
2941 | } | |
718e3744 | 2942 | } |
2943 | } | |
6d85b15b | 2944 | else if (peer->sort == BGP_PEER_CONFED) |
718e3744 | 2945 | { |
2946 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
2947 | aspath = aspath_dup (attr->aspath); | |
2948 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
2949 | } | |
2950 | else | |
2951 | aspath = attr->aspath; | |
2952 | ||
0b2aa3a0 PJ |
2953 | /* If peer is not AS4 capable, then: |
2954 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
2955 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
2956 | * types are in it (i.e. exclude them if they are there) | |
2957 | * AND do this only if there is at least one asnum > 65535 in the path! | |
2958 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
2959 | * all ASnums > 65535 to BGP_AS_TRANS | |
2960 | */ | |
2961 | ||
2962 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
2963 | stream_putc (s, BGP_ATTR_AS_PATH); | |
2964 | aspath_sizep = stream_get_endp (s); | |
2965 | stream_putw (s, 0); | |
2966 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
2967 | ||
2968 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
2969 | * in the path | |
2970 | */ | |
2971 | if (!use32bit && aspath_has_as4 (aspath)) | |
2972 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
2973 | ||
718e3744 | 2974 | /* Nexthop attribute. */ |
93b73dfa | 2975 | if (afi == AFI_IP && safi == SAFI_UNICAST && !peer_cap_enhe(peer)) |
718e3744 | 2976 | { |
8a92a8a0 DS |
2977 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
2978 | { | |
2979 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2980 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2981 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2982 | stream_putc (s, 4); | |
2983 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2984 | } | |
2985 | else if (safi == SAFI_UNICAST && peer_cap_enhe(from)) | |
2986 | { | |
2987 | /* | |
2988 | * Likely this is the case when an IPv4 prefix was received with | |
2989 | * Extended Next-hop capability and now being advertised to | |
2990 | * non-ENHE peers. | |
2991 | * Setting the mandatory (ipv4) next-hop attribute here to enable | |
2992 | * implicit next-hop self with correct (ipv4 address family). | |
2993 | */ | |
2994 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
2995 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
2996 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, NULL); | |
2997 | stream_putc (s, 4); | |
2998 | stream_put_ipv4 (s, 0); | |
2999 | } | |
718e3744 | 3000 | } |
3001 | ||
3002 | /* MED attribute. */ | |
abc920f8 DS |
3003 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC) || |
3004 | bgp->maxmed_active) | |
718e3744 | 3005 | { |
3006 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3007 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3008 | stream_putc (s, 4); | |
abc920f8 | 3009 | stream_putl (s, (bgp->maxmed_active ? bgp->maxmed_value : attr->med)); |
718e3744 | 3010 | } |
3011 | ||
3012 | /* Local preference. */ | |
6d85b15b JBD |
3013 | if (peer->sort == BGP_PEER_IBGP || |
3014 | peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3015 | { |
3016 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3017 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3018 | stream_putc (s, 4); | |
3019 | stream_putl (s, attr->local_pref); | |
3020 | } | |
3021 | ||
3022 | /* Atomic aggregate. */ | |
3023 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3024 | { | |
3025 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3026 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3027 | stream_putc (s, 0); | |
3028 | } | |
3029 | ||
3030 | /* Aggregator. */ | |
3031 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3032 | { | |
fb982c25 | 3033 | assert (attr->extra); |
0b2aa3a0 PJ |
3034 | |
3035 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
718e3744 | 3036 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
3037 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
3038 | |
3039 | if (use32bit) | |
3040 | { | |
3041 | /* AS4 capable peer */ | |
3042 | stream_putc (s, 8); | |
3043 | stream_putl (s, attr->extra->aggregator_as); | |
3044 | } | |
3045 | else | |
3046 | { | |
3047 | /* 2-byte AS peer */ | |
3048 | stream_putc (s, 6); | |
3049 | ||
3050 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
3051 | if ( attr->extra->aggregator_as > 65535 ) | |
3052 | { | |
3053 | stream_putw (s, BGP_AS_TRANS); | |
3054 | ||
3055 | /* we have to send AS4_AGGREGATOR, too. | |
3056 | * we'll do that later in order to send attributes in ascending | |
3057 | * order. | |
3058 | */ | |
3059 | send_as4_aggregator = 1; | |
3060 | } | |
3061 | else | |
3062 | stream_putw (s, (u_int16_t) attr->extra->aggregator_as); | |
3063 | } | |
fb982c25 | 3064 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 3065 | } |
3066 | ||
3067 | /* Community attribute. */ | |
3068 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3069 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
3070 | { | |
3071 | if (attr->community->size * 4 > 255) | |
3072 | { | |
3073 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3074 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3075 | stream_putw (s, attr->community->size * 4); | |
3076 | } | |
3077 | else | |
3078 | { | |
3079 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3080 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3081 | stream_putc (s, attr->community->size * 4); | |
3082 | } | |
3083 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3084 | } | |
3085 | ||
3086 | /* Route Reflector. */ | |
6d85b15b | 3087 | if (peer->sort == BGP_PEER_IBGP |
718e3744 | 3088 | && from |
6d85b15b | 3089 | && from->sort == BGP_PEER_IBGP) |
718e3744 | 3090 | { |
3091 | /* Originator ID. */ | |
3092 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3093 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
3094 | stream_putc (s, 4); | |
3095 | ||
3096 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
fb982c25 | 3097 | stream_put_in_addr (s, &attr->extra->originator_id); |
34c3f81b PJ |
3098 | else |
3099 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 3100 | |
3101 | /* Cluster list. */ | |
3102 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3103 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
3104 | ||
9eda90ce | 3105 | if (attr->extra && attr->extra->cluster) |
718e3744 | 3106 | { |
fb982c25 | 3107 | stream_putc (s, attr->extra->cluster->length + 4); |
718e3744 | 3108 | /* If this peer configuration's parent BGP has cluster_id. */ |
3109 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3110 | stream_put_in_addr (s, &bgp->cluster_id); | |
3111 | else | |
3112 | stream_put_in_addr (s, &bgp->router_id); | |
fb982c25 PJ |
3113 | stream_put (s, attr->extra->cluster->list, |
3114 | attr->extra->cluster->length); | |
718e3744 | 3115 | } |
3116 | else | |
3117 | { | |
3118 | stream_putc (s, 4); | |
3119 | /* If this peer configuration's parent BGP has cluster_id. */ | |
3120 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3121 | stream_put_in_addr (s, &bgp->cluster_id); | |
3122 | else | |
3123 | stream_put_in_addr (s, &bgp->router_id); | |
3124 | } | |
3125 | } | |
3126 | ||
718e3744 | 3127 | /* Extended Communities attribute. */ |
3128 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3129 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
3130 | { | |
fb982c25 PJ |
3131 | struct attr_extra *attre = attr->extra; |
3132 | ||
3133 | assert (attre); | |
3134 | ||
6d85b15b JBD |
3135 | if (peer->sort == BGP_PEER_IBGP |
3136 | || peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3137 | { |
fb982c25 | 3138 | if (attre->ecommunity->size * 8 > 255) |
4372df71 | 3139 | { |
3140 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3141 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 3142 | stream_putw (s, attre->ecommunity->size * 8); |
4372df71 | 3143 | } |
3144 | else | |
3145 | { | |
3146 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3147 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 3148 | stream_putc (s, attre->ecommunity->size * 8); |
4372df71 | 3149 | } |
fb982c25 | 3150 | stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8); |
718e3744 | 3151 | } |
3152 | else | |
3153 | { | |
5228ad27 | 3154 | u_int8_t *pnt; |
4372df71 | 3155 | int tbit; |
3156 | int ecom_tr_size = 0; | |
3157 | int i; | |
3158 | ||
fb982c25 | 3159 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 3160 | { |
fb982c25 | 3161 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 3162 | tbit = *pnt; |
3163 | ||
3164 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3165 | continue; | |
3166 | ||
3167 | ecom_tr_size++; | |
3168 | } | |
3169 | ||
3170 | if (ecom_tr_size) | |
3171 | { | |
3172 | if (ecom_tr_size * 8 > 255) | |
3173 | { | |
3174 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3175 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3176 | stream_putw (s, ecom_tr_size * 8); | |
3177 | } | |
3178 | else | |
3179 | { | |
3180 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3181 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3182 | stream_putc (s, ecom_tr_size * 8); | |
3183 | } | |
3184 | ||
fb982c25 | 3185 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 3186 | { |
fb982c25 | 3187 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 3188 | tbit = *pnt; |
3189 | ||
3190 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3191 | continue; | |
3192 | ||
3193 | stream_put (s, pnt, 8); | |
3194 | } | |
3195 | } | |
718e3744 | 3196 | } |
718e3744 | 3197 | } |
0b2aa3a0 PJ |
3198 | |
3199 | if ( send_as4_path ) | |
3200 | { | |
3201 | /* If the peer is NOT As4 capable, AND */ | |
3202 | /* there are ASnums > 65535 in path THEN | |
3203 | * give out AS4_PATH */ | |
3204 | ||
3205 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3206 | * path segments! | |
3207 | * Hm, I wonder... confederation things *should* only be at | |
3208 | * the beginning of an aspath, right? Then we should use | |
3209 | * aspath_delete_confed_seq for this, because it is already | |
3210 | * there! (JK) | |
3211 | * Folks, talk to me: what is reasonable here!? | |
3212 | */ | |
3213 | aspath = aspath_delete_confed_seq (aspath); | |
3214 | ||
3215 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
3216 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
3217 | aspath_sizep = stream_get_endp (s); | |
3218 | stream_putw (s, 0); | |
3219 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
3220 | } | |
3221 | ||
3222 | if (aspath != attr->aspath) | |
3223 | aspath_free (aspath); | |
3224 | ||
3225 | if ( send_as4_aggregator ) | |
3226 | { | |
3227 | assert (attr->extra); | |
3228 | ||
3229 | /* send AS4_AGGREGATOR, at this place */ | |
3230 | /* this section of code moved here in order to ensure the correct | |
3231 | * *ascending* order of attributes | |
3232 | */ | |
3233 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3234 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
3235 | stream_putc (s, 8); | |
3236 | stream_putl (s, attr->extra->aggregator_as); | |
3237 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); | |
3238 | } | |
587ff0fd LB |
3239 | |
3240 | if ((afi == AFI_IP || afi == AFI_IP6) && | |
3241 | (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3242 | { | |
3243 | /* Tunnel Encap attribute */ | |
3244 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3245 | |
3246 | #if ENABLE_BGP_VNC | |
3247 | /* VNC attribute */ | |
3248 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
3249 | #endif | |
587ff0fd LB |
3250 | } |
3251 | ||
718e3744 | 3252 | /* Unknown transit attribute. */ |
fb982c25 PJ |
3253 | if (attr->extra && attr->extra->transit) |
3254 | stream_put (s, attr->extra->transit->val, attr->extra->transit->length); | |
718e3744 | 3255 | |
3256 | /* Return total size of attribute. */ | |
9985f83c | 3257 | return stream_get_endp (s) - cp; |
718e3744 | 3258 | } |
3259 | ||
8c71e481 PM |
3260 | size_t |
3261 | bgp_packet_mpunreach_start (struct stream *s, afi_t afi, safi_t safi) | |
718e3744 | 3262 | { |
718e3744 | 3263 | unsigned long attrlen_pnt; |
718e3744 | 3264 | |
8c71e481 PM |
3265 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3266 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
718e3744 | 3267 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); |
3268 | ||
9985f83c | 3269 | attrlen_pnt = stream_get_endp (s); |
8c71e481 | 3270 | stream_putw (s, 0); /* Length of this attribute. */ |
718e3744 | 3271 | |
8c71e481 | 3272 | stream_putw (s, afi); |
93b73dfa | 3273 | stream_putc (s, (safi == SAFI_MPLS_VPN) ? SAFI_MPLS_LABELED_VPN : safi); |
8c71e481 PM |
3274 | return attrlen_pnt; |
3275 | } | |
718e3744 | 3276 | |
8c71e481 PM |
3277 | void |
3278 | bgp_packet_mpunreach_prefix (struct stream *s, struct prefix *p, | |
3279 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
adbac85e DW |
3280 | u_char *tag, int addpath_encode, |
3281 | u_int32_t addpath_tx_id) | |
8c71e481 | 3282 | { |
718e3744 | 3283 | if (safi == SAFI_MPLS_VPN) |
3284 | { | |
adbac85e DW |
3285 | /* addpath TX ID */ |
3286 | if (addpath_encode) | |
3287 | stream_putl(s, addpath_tx_id); | |
3288 | ||
718e3744 | 3289 | stream_putc (s, p->prefixlen + 88); |
3290 | stream_put (s, tag, 3); | |
3291 | stream_put (s, prd->val, 8); | |
3292 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
3293 | } | |
3294 | else | |
adbac85e | 3295 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); |
8c71e481 | 3296 | } |
718e3744 | 3297 | |
8c71e481 PM |
3298 | void |
3299 | bgp_packet_mpunreach_end (struct stream *s, size_t attrlen_pnt) | |
3300 | { | |
93b73dfa | 3301 | bgp_packet_mpattr_end (s, attrlen_pnt); |
718e3744 | 3302 | } |
3303 | ||
3304 | /* Initialization of attribute. */ | |
3305 | void | |
fe69a505 | 3306 | bgp_attr_init (void) |
718e3744 | 3307 | { |
718e3744 | 3308 | aspath_init (); |
3309 | attrhash_init (); | |
3310 | community_init (); | |
3311 | ecommunity_init (); | |
3312 | cluster_init (); | |
3313 | transit_init (); | |
bede7744 | 3314 | encap_init (); |
718e3744 | 3315 | } |
3316 | ||
228da428 CC |
3317 | void |
3318 | bgp_attr_finish (void) | |
3319 | { | |
3320 | aspath_finish (); | |
3321 | attrhash_finish (); | |
3322 | community_finish (); | |
3323 | ecommunity_finish (); | |
3324 | cluster_finish (); | |
3325 | transit_finish (); | |
bede7744 | 3326 | encap_finish (); |
228da428 CC |
3327 | } |
3328 | ||
718e3744 | 3329 | /* Make attribute packet. */ |
3330 | void | |
a384592f | 3331 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
3332 | struct prefix *prefix) | |
718e3744 | 3333 | { |
3334 | unsigned long cp; | |
3335 | unsigned long len; | |
0b2aa3a0 | 3336 | size_t aspath_lenp; |
718e3744 | 3337 | struct aspath *aspath; |
adbac85e DW |
3338 | int addpath_encode = 0; |
3339 | u_int32_t addpath_tx_id = 0; | |
718e3744 | 3340 | |
3341 | /* Remember current pointer. */ | |
9985f83c | 3342 | cp = stream_get_endp (s); |
718e3744 | 3343 | |
3344 | /* Place holder of length. */ | |
3345 | stream_putw (s, 0); | |
3346 | ||
3347 | /* Origin attribute. */ | |
3348 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3349 | stream_putc (s, BGP_ATTR_ORIGIN); | |
3350 | stream_putc (s, 1); | |
3351 | stream_putc (s, attr->origin); | |
3352 | ||
3353 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
3354 | |
3355 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3356 | stream_putc (s, BGP_ATTR_AS_PATH); | |
3357 | aspath_lenp = stream_get_endp (s); | |
3358 | stream_putw (s, 0); | |
3359 | ||
3360 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 3361 | |
3362 | /* Nexthop attribute. */ | |
a384592f | 3363 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
3364 | if(prefix != NULL | |
3365 | #ifdef HAVE_IPV6 | |
3366 | && prefix->family != AF_INET6 | |
3367 | #endif /* HAVE_IPV6 */ | |
3368 | ) | |
3369 | { | |
3370 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3371 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3372 | stream_putc (s, 4); | |
3373 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
3374 | } | |
718e3744 | 3375 | |
3376 | /* MED attribute. */ | |
3377 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
3378 | { | |
3379 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3380 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3381 | stream_putc (s, 4); | |
3382 | stream_putl (s, attr->med); | |
3383 | } | |
3384 | ||
3385 | /* Local preference. */ | |
3386 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
3387 | { | |
3388 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3389 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3390 | stream_putc (s, 4); | |
3391 | stream_putl (s, attr->local_pref); | |
3392 | } | |
3393 | ||
3394 | /* Atomic aggregate. */ | |
3395 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3396 | { | |
3397 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3398 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3399 | stream_putc (s, 0); | |
3400 | } | |
3401 | ||
3402 | /* Aggregator. */ | |
3403 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3404 | { | |
fb982c25 | 3405 | assert (attr->extra); |
718e3744 | 3406 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
3407 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
3408 | stream_putc (s, 8); |
3409 | stream_putl (s, attr->extra->aggregator_as); | |
fb982c25 | 3410 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 3411 | } |
3412 | ||
3413 | /* Community attribute. */ | |
3414 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
3415 | { | |
3416 | if (attr->community->size * 4 > 255) | |
3417 | { | |
3418 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3419 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3420 | stream_putw (s, attr->community->size * 4); | |
3421 | } | |
3422 | else | |
3423 | { | |
3424 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3425 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3426 | stream_putc (s, attr->community->size * 4); | |
3427 | } | |
3428 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3429 | } | |
3430 | ||
a384592f | 3431 | #ifdef HAVE_IPV6 |
3432 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
fb982c25 | 3433 | if (prefix != NULL && prefix->family == AF_INET6 && attr->extra && |
801a9bcc DS |
3434 | (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL || |
3435 | attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) ) | |
a384592f | 3436 | { |
3437 | int sizep; | |
fb982c25 PJ |
3438 | struct attr_extra *attre = attr->extra; |
3439 | ||
a384592f | 3440 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
3441 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 3442 | sizep = stream_get_endp (s); |
a384592f | 3443 | |
3444 | /* MP header */ | |
fb982c25 | 3445 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 3446 | stream_putw(s, AFI_IP6); /* AFI */ |
3447 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3448 | ||
3449 | /* Next hop */ | |
fb982c25 | 3450 | stream_putc(s, attre->mp_nexthop_len); |
801a9bcc DS |
3451 | stream_put(s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
3452 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3453 | stream_put(s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
a384592f | 3454 | |
3455 | /* SNPA */ | |
3456 | stream_putc(s, 0); | |
3457 | ||
3458 | /* Prefix */ | |
adbac85e | 3459 | stream_put_prefix_addpath (s, prefix, addpath_encode, addpath_tx_id); |
a384592f | 3460 | |
3461 | /* Set MP attribute length. */ | |
9985f83c | 3462 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 3463 | } |
3464 | #endif /* HAVE_IPV6 */ | |
3465 | ||
718e3744 | 3466 | /* Return total size of attribute. */ |
9985f83c | 3467 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 3468 | stream_putw_at (s, cp, len); |
3469 | } |