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Commit | Line | Data |
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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" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
718e3744 | 35 | |
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_route.h" | |
39 | #include "bgpd/bgp_aspath.h" | |
40 | #include "bgpd/bgp_community.h" | |
41 | #include "bgpd/bgp_debug.h" | |
42 | #include "bgpd/bgp_packet.h" | |
43 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 44 | #include "bgpd/bgp_lcommunity.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 | |
b18825eb PG |
52 | #include "bgp_encap_types.h" |
53 | #include "bgp_evpn.h" | |
6b0655a2 | 54 | |
718e3744 | 55 | /* Attribute strings for logging. */ |
9bddac4b | 56 | static const struct message attr_str [] = |
718e3744 | 57 | { |
58 | { BGP_ATTR_ORIGIN, "ORIGIN" }, | |
59 | { BGP_ATTR_AS_PATH, "AS_PATH" }, | |
60 | { BGP_ATTR_NEXT_HOP, "NEXT_HOP" }, | |
61 | { BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" }, | |
62 | { BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" }, | |
63 | { BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" }, | |
64 | { BGP_ATTR_AGGREGATOR, "AGGREGATOR" }, | |
65 | { BGP_ATTR_COMMUNITIES, "COMMUNITY" }, | |
66 | { BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" }, | |
f8627ff1 | 67 | { BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST" }, |
718e3744 | 68 | { BGP_ATTR_DPA, "DPA" }, |
69 | { BGP_ATTR_ADVERTISER, "ADVERTISER"} , | |
70 | { BGP_ATTR_RCID_PATH, "RCID_PATH" }, | |
71 | { BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" }, | |
72 | { BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" }, | |
0b2aa3a0 PJ |
73 | { BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" }, |
74 | { BGP_ATTR_AS4_PATH, "AS4_PATH" }, | |
75 | { BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" }, | |
76 | { BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" }, | |
f4c89855 | 77 | { BGP_ATTR_ENCAP, "ENCAP" }, |
65efcfce LB |
78 | #if ENABLE_BGP_VNC |
79 | { BGP_ATTR_VNC, "VNC" }, | |
80 | #endif | |
57d187bc | 81 | { BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY" } |
718e3744 | 82 | }; |
837d16cc | 83 | static const int attr_str_max = array_size(attr_str); |
afcb7679 DO |
84 | |
85 | static const struct message attr_flag_str[] = | |
86 | { | |
87 | { BGP_ATTR_FLAG_OPTIONAL, "Optional" }, | |
88 | { BGP_ATTR_FLAG_TRANS, "Transitive" }, | |
89 | { BGP_ATTR_FLAG_PARTIAL, "Partial" }, | |
90 | /* bgp_attr_flags_diagnose() relies on this bit being last in this list */ | |
91 | { BGP_ATTR_FLAG_EXTLEN, "Extended Length" }, | |
92 | }; | |
6b0655a2 | 93 | |
9bddac4b | 94 | static struct hash *cluster_hash; |
718e3744 | 95 | |
94f2b392 | 96 | static void * |
923de654 | 97 | cluster_hash_alloc (void *p) |
718e3744 | 98 | { |
ffd0c037 | 99 | const struct cluster_list *val = (const struct cluster_list *) p; |
718e3744 | 100 | struct cluster_list *cluster; |
101 | ||
102 | cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); | |
103 | cluster->length = val->length; | |
104 | ||
105 | if (cluster->length) | |
106 | { | |
107 | cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length); | |
108 | memcpy (cluster->list, val->list, val->length); | |
109 | } | |
110 | else | |
111 | cluster->list = NULL; | |
112 | ||
113 | cluster->refcnt = 0; | |
114 | ||
115 | return cluster; | |
116 | } | |
117 | ||
118 | /* Cluster list related functions. */ | |
94f2b392 | 119 | static struct cluster_list * |
5228ad27 | 120 | cluster_parse (struct in_addr * pnt, int length) |
718e3744 | 121 | { |
122 | struct cluster_list tmp; | |
123 | struct cluster_list *cluster; | |
124 | ||
125 | tmp.length = length; | |
5228ad27 | 126 | tmp.list = pnt; |
718e3744 | 127 | |
128 | cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc); | |
129 | cluster->refcnt++; | |
130 | return cluster; | |
131 | } | |
132 | ||
133 | int | |
134 | cluster_loop_check (struct cluster_list *cluster, struct in_addr originator) | |
135 | { | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < cluster->length / 4; i++) | |
139 | if (cluster->list[i].s_addr == originator.s_addr) | |
140 | return 1; | |
141 | return 0; | |
142 | } | |
143 | ||
94f2b392 | 144 | static unsigned int |
923de654 | 145 | cluster_hash_key_make (void *p) |
718e3744 | 146 | { |
c8e7b895 | 147 | const struct cluster_list *cluster = p; |
718e3744 | 148 | |
c8e7b895 | 149 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 150 | } |
151 | ||
94f2b392 | 152 | static int |
ffe11cfb | 153 | cluster_hash_cmp (const void *p1, const void *p2) |
718e3744 | 154 | { |
ffe11cfb SH |
155 | const struct cluster_list * cluster1 = p1; |
156 | const struct cluster_list * cluster2 = p2; | |
923de654 | 157 | |
ffe11cfb SH |
158 | return (cluster1->length == cluster2->length && |
159 | memcmp (cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 160 | } |
161 | ||
94f2b392 | 162 | static void |
718e3744 | 163 | cluster_free (struct cluster_list *cluster) |
164 | { | |
165 | if (cluster->list) | |
166 | XFREE (MTYPE_CLUSTER_VAL, cluster->list); | |
167 | XFREE (MTYPE_CLUSTER, cluster); | |
168 | } | |
169 | ||
94f2b392 | 170 | static struct cluster_list * |
718e3744 | 171 | cluster_dup (struct cluster_list *cluster) |
172 | { | |
173 | struct cluster_list *new; | |
174 | ||
393deb9b | 175 | new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list)); |
718e3744 | 176 | new->length = cluster->length; |
177 | ||
178 | if (cluster->length) | |
179 | { | |
180 | new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length); | |
181 | memcpy (new->list, cluster->list, cluster->length); | |
182 | } | |
183 | else | |
184 | new->list = NULL; | |
185 | ||
186 | return new; | |
187 | } | |
188 | ||
94f2b392 | 189 | static struct cluster_list * |
718e3744 | 190 | cluster_intern (struct cluster_list *cluster) |
191 | { | |
192 | struct cluster_list *find; | |
193 | ||
194 | find = hash_get (cluster_hash, cluster, cluster_hash_alloc); | |
195 | find->refcnt++; | |
196 | ||
197 | return find; | |
198 | } | |
199 | ||
200 | void | |
201 | cluster_unintern (struct cluster_list *cluster) | |
202 | { | |
718e3744 | 203 | if (cluster->refcnt) |
204 | cluster->refcnt--; | |
205 | ||
206 | if (cluster->refcnt == 0) | |
207 | { | |
9206f9ec | 208 | hash_release (cluster_hash, cluster); |
718e3744 | 209 | cluster_free (cluster); |
210 | } | |
211 | } | |
212 | ||
94f2b392 | 213 | static void |
214 | cluster_init (void) | |
718e3744 | 215 | { |
216 | cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp); | |
217 | } | |
228da428 CC |
218 | |
219 | static void | |
220 | cluster_finish (void) | |
221 | { | |
289d2501 | 222 | hash_clean (cluster_hash, (void (*)(void *))cluster_free); |
228da428 CC |
223 | hash_free (cluster_hash); |
224 | cluster_hash = NULL; | |
225 | } | |
6b0655a2 | 226 | |
bede7744 LB |
227 | static struct hash *encap_hash = NULL; |
228 | #if ENABLE_BGP_VNC | |
229 | static struct hash *vnc_hash = NULL; | |
230 | #endif | |
231 | ||
f4c89855 LB |
232 | struct bgp_attr_encap_subtlv * |
233 | encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) | |
234 | { | |
235 | struct bgp_attr_encap_subtlv *new; | |
236 | struct bgp_attr_encap_subtlv *tail; | |
237 | struct bgp_attr_encap_subtlv *p; | |
238 | ||
239 | for (p = orig, tail = new = NULL; p; p = p->next) { | |
240 | int size = sizeof(struct bgp_attr_encap_subtlv) - 1 + p->length; | |
241 | if (tail) { | |
242 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
243 | tail = tail->next; | |
244 | } else { | |
245 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
246 | } | |
247 | assert(tail); | |
248 | memcpy(tail, p, size); | |
249 | tail->next = NULL; | |
250 | } | |
251 | ||
252 | return new; | |
253 | } | |
254 | ||
255 | static void | |
256 | encap_free(struct bgp_attr_encap_subtlv *p) | |
257 | { | |
258 | struct bgp_attr_encap_subtlv *next; | |
259 | while (p) { | |
260 | next = p->next; | |
261 | p->next = NULL; | |
262 | XFREE(MTYPE_ENCAP_TLV, p); | |
263 | p = next; | |
264 | } | |
265 | } | |
266 | ||
267 | void | |
268 | bgp_attr_flush_encap(struct attr *attr) | |
269 | { | |
270 | if (!attr || !attr->extra) | |
271 | return; | |
272 | ||
273 | if (attr->extra->encap_subtlvs) { | |
274 | encap_free(attr->extra->encap_subtlvs); | |
275 | attr->extra->encap_subtlvs = NULL; | |
276 | } | |
65efcfce LB |
277 | #if ENABLE_BGP_VNC |
278 | if (attr->extra->vnc_subtlvs) { | |
279 | encap_free(attr->extra->vnc_subtlvs); | |
280 | attr->extra->vnc_subtlvs = NULL; | |
281 | } | |
282 | #endif | |
f4c89855 LB |
283 | } |
284 | ||
285 | /* | |
286 | * Compare encap sub-tlv chains | |
287 | * | |
288 | * 1 = equivalent | |
289 | * 0 = not equivalent | |
290 | * | |
291 | * This algorithm could be made faster if needed | |
292 | */ | |
293 | static int | |
294 | encap_same(struct bgp_attr_encap_subtlv *h1, struct bgp_attr_encap_subtlv *h2) | |
295 | { | |
296 | struct bgp_attr_encap_subtlv *p; | |
297 | struct bgp_attr_encap_subtlv *q; | |
298 | ||
f4c89855 LB |
299 | if (h1 == h2) |
300 | return 1; | |
bede7744 LB |
301 | if (h1 == NULL || h2 == NULL) |
302 | return 0; | |
f4c89855 LB |
303 | |
304 | for (p = h1; p; p = p->next) { | |
305 | for (q = h2; q; q = q->next) { | |
306 | if ((p->type == q->type) && | |
307 | (p->length == q->length) && | |
308 | !memcmp(p->value, q->value, p->length)) { | |
309 | ||
310 | break; | |
311 | } | |
312 | } | |
313 | if (!q) | |
314 | return 0; | |
315 | } | |
316 | ||
317 | for (p = h2; p; p = p->next) { | |
318 | for (q = h1; q; q = q->next) { | |
319 | if ((p->type == q->type) && | |
320 | (p->length == q->length) && | |
321 | !memcmp(p->value, q->value, p->length)) { | |
322 | ||
323 | break; | |
324 | } | |
325 | } | |
326 | if (!q) | |
327 | return 0; | |
328 | } | |
329 | ||
330 | return 1; | |
331 | } | |
332 | ||
bede7744 LB |
333 | static void * |
334 | encap_hash_alloc (void *p) | |
335 | { | |
336 | /* Encap structure is already allocated. */ | |
337 | return p; | |
338 | } | |
339 | ||
340 | typedef enum | |
341 | { | |
342 | ENCAP_SUBTLV_TYPE, | |
343 | #if ENABLE_BGP_VNC | |
344 | VNC_SUBTLV_TYPE | |
345 | #endif | |
346 | } encap_subtlv_type; | |
347 | ||
348 | static struct bgp_attr_encap_subtlv * | |
349 | encap_intern (struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) | |
350 | { | |
351 | struct bgp_attr_encap_subtlv *find; | |
352 | struct hash *hash = encap_hash; | |
353 | #if ENABLE_BGP_VNC | |
354 | if (type == VNC_SUBTLV_TYPE) | |
355 | hash = vnc_hash; | |
356 | #endif | |
357 | ||
358 | find = hash_get (hash, encap, encap_hash_alloc); | |
359 | if (find != encap) | |
360 | encap_free (encap); | |
361 | find->refcnt++; | |
362 | ||
363 | return find; | |
364 | } | |
365 | ||
366 | static void | |
367 | encap_unintern (struct bgp_attr_encap_subtlv **encapp, encap_subtlv_type type) | |
368 | { | |
369 | struct bgp_attr_encap_subtlv *encap = *encapp; | |
370 | if (encap->refcnt) | |
371 | encap->refcnt--; | |
372 | ||
373 | if (encap->refcnt == 0) | |
374 | { | |
375 | struct hash *hash = encap_hash; | |
376 | #if ENABLE_BGP_VNC | |
377 | if (type == VNC_SUBTLV_TYPE) | |
378 | hash = vnc_hash; | |
379 | #endif | |
380 | hash_release (hash, encap); | |
381 | encap_free (encap); | |
382 | *encapp = NULL; | |
383 | } | |
384 | } | |
385 | ||
386 | static unsigned int | |
387 | encap_hash_key_make (void *p) | |
388 | { | |
389 | const struct bgp_attr_encap_subtlv * encap = p; | |
390 | ||
391 | return jhash(encap->value, encap->length, 0); | |
392 | } | |
393 | ||
394 | static int | |
395 | encap_hash_cmp (const void *p1, const void *p2) | |
396 | { | |
397 | return encap_same((struct bgp_attr_encap_subtlv *)p1, | |
398 | (struct bgp_attr_encap_subtlv *)p2); | |
399 | } | |
400 | ||
401 | static void | |
402 | encap_init (void) | |
403 | { | |
404 | encap_hash = hash_create (encap_hash_key_make, encap_hash_cmp); | |
405 | #if ENABLE_BGP_VNC | |
406 | vnc_hash = hash_create (encap_hash_key_make, encap_hash_cmp); | |
407 | #endif | |
408 | } | |
409 | ||
410 | static void | |
411 | encap_finish (void) | |
412 | { | |
413 | hash_clean (encap_hash, (void (*)(void *))encap_free); | |
414 | hash_free (encap_hash); | |
415 | encap_hash = NULL; | |
416 | #if ENABLE_BGP_VNC | |
417 | hash_clean (vnc_hash, (void (*)(void *))encap_free); | |
418 | hash_free (vnc_hash); | |
419 | vnc_hash = NULL; | |
420 | #endif | |
421 | } | |
422 | ||
684a7227 PG |
423 | static bool |
424 | overlay_index_same(const struct attr_extra *ae1, const struct attr_extra *ae2) | |
425 | { | |
426 | if(!ae1 && ae2) | |
427 | return false; | |
428 | if(!ae2 && ae1) | |
429 | return false; | |
430 | if(!ae1 && !ae2) | |
c298dae2 | 431 | return true; |
684a7227 PG |
432 | return !memcmp(&(ae1->evpn_overlay), &(ae2->evpn_overlay), sizeof(struct overlay_index)); |
433 | } | |
434 | ||
718e3744 | 435 | /* Unknown transit attribute. */ |
9bddac4b | 436 | static struct hash *transit_hash; |
718e3744 | 437 | |
94f2b392 | 438 | static void |
718e3744 | 439 | transit_free (struct transit *transit) |
440 | { | |
441 | if (transit->val) | |
442 | XFREE (MTYPE_TRANSIT_VAL, transit->val); | |
443 | XFREE (MTYPE_TRANSIT, transit); | |
444 | } | |
445 | ||
73ac8160 DS |
446 | static struct transit * |
447 | transit_dup (struct transit *transit) | |
448 | { | |
449 | struct transit *new; | |
450 | ||
451 | new = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); | |
452 | new->length = transit->length; | |
453 | if (new->length) | |
454 | { | |
455 | new->val = XMALLOC (MTYPE_TRANSIT_VAL, transit->length); | |
456 | memcpy (new->val, transit->val, transit->length); | |
457 | } | |
458 | else | |
459 | new->val = NULL; | |
460 | ||
461 | return new; | |
462 | } | |
923de654 | 463 | |
94f2b392 | 464 | static void * |
923de654 | 465 | transit_hash_alloc (void *p) |
718e3744 | 466 | { |
467 | /* Transit structure is already allocated. */ | |
923de654 | 468 | return p; |
718e3744 | 469 | } |
470 | ||
94f2b392 | 471 | static struct transit * |
718e3744 | 472 | transit_intern (struct transit *transit) |
473 | { | |
474 | struct transit *find; | |
475 | ||
476 | find = hash_get (transit_hash, transit, transit_hash_alloc); | |
477 | if (find != transit) | |
478 | transit_free (transit); | |
479 | find->refcnt++; | |
480 | ||
481 | return find; | |
482 | } | |
483 | ||
484 | void | |
485 | transit_unintern (struct transit *transit) | |
486 | { | |
718e3744 | 487 | if (transit->refcnt) |
488 | transit->refcnt--; | |
489 | ||
490 | if (transit->refcnt == 0) | |
491 | { | |
9206f9ec | 492 | hash_release (transit_hash, transit); |
718e3744 | 493 | transit_free (transit); |
494 | } | |
495 | } | |
496 | ||
94f2b392 | 497 | static unsigned int |
923de654 | 498 | transit_hash_key_make (void *p) |
718e3744 | 499 | { |
c8e7b895 | 500 | const struct transit * transit = p; |
718e3744 | 501 | |
c8e7b895 | 502 | return jhash(transit->val, transit->length, 0); |
718e3744 | 503 | } |
504 | ||
94f2b392 | 505 | static int |
ffe11cfb | 506 | transit_hash_cmp (const void *p1, const void *p2) |
718e3744 | 507 | { |
ffe11cfb SH |
508 | const struct transit * transit1 = p1; |
509 | const struct transit * transit2 = p2; | |
923de654 | 510 | |
ffe11cfb SH |
511 | return (transit1->length == transit2->length && |
512 | memcmp (transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 513 | } |
514 | ||
94f2b392 | 515 | static void |
66e5cd87 | 516 | transit_init (void) |
718e3744 | 517 | { |
518 | transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp); | |
519 | } | |
228da428 CC |
520 | |
521 | static void | |
522 | transit_finish (void) | |
523 | { | |
289d2501 | 524 | hash_clean (transit_hash, (void (*)(void *))transit_free); |
228da428 CC |
525 | hash_free (transit_hash); |
526 | transit_hash = NULL; | |
527 | } | |
6b0655a2 | 528 | |
718e3744 | 529 | /* Attribute hash routines. */ |
9bddac4b | 530 | static struct hash *attrhash; |
718e3744 | 531 | |
fb982c25 PJ |
532 | static struct attr_extra * |
533 | bgp_attr_extra_new (void) | |
534 | { | |
535 | return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra)); | |
536 | } | |
537 | ||
538 | void | |
539 | bgp_attr_extra_free (struct attr *attr) | |
540 | { | |
541 | if (attr->extra) | |
542 | { | |
543 | XFREE (MTYPE_ATTR_EXTRA, attr->extra); | |
544 | attr->extra = NULL; | |
545 | } | |
546 | } | |
547 | ||
548 | struct attr_extra * | |
549 | bgp_attr_extra_get (struct attr *attr) | |
550 | { | |
551 | if (!attr->extra) | |
552 | attr->extra = bgp_attr_extra_new(); | |
553 | return attr->extra; | |
554 | } | |
555 | ||
556 | /* Shallow copy of an attribute | |
557 | * Though, not so shallow that it doesn't copy the contents | |
558 | * of the attr_extra pointed to by 'extra' | |
559 | */ | |
560 | void | |
561 | bgp_attr_dup (struct attr *new, struct attr *orig) | |
562 | { | |
558d1fec JBD |
563 | struct attr_extra *extra = new->extra; |
564 | ||
fb982c25 | 565 | *new = *orig; |
a0de1d16 CF |
566 | /* if caller provided attr_extra space, use it in any case. |
567 | * | |
568 | * This is neccesary even if orig->extra equals NULL, because otherwise | |
569 | * memory may be later allocated on the heap by bgp_attr_extra_get. | |
570 | * | |
571 | * That memory would eventually be leaked, because the caller must not | |
572 | * call bgp_attr_extra_free if he provided attr_extra on the stack. | |
573 | */ | |
574 | if (extra) | |
575 | { | |
576 | new->extra = extra; | |
577 | memset(new->extra, 0, sizeof(struct attr_extra)); | |
f4c89855 | 578 | if (orig->extra) { |
a0de1d16 | 579 | *new->extra = *orig->extra; |
f4c89855 | 580 | } |
a0de1d16 CF |
581 | } |
582 | else if (orig->extra) | |
fb982c25 | 583 | { |
a0de1d16 | 584 | new->extra = bgp_attr_extra_new(); |
fb982c25 PJ |
585 | *new->extra = *orig->extra; |
586 | } | |
587 | } | |
588 | ||
73ac8160 DS |
589 | void |
590 | bgp_attr_deep_dup (struct attr *new, struct attr *orig) | |
591 | { | |
592 | if (orig->aspath) | |
593 | new->aspath = aspath_dup(orig->aspath); | |
594 | ||
595 | if (orig->community) | |
596 | new->community = community_dup(orig->community); | |
597 | ||
598 | if (orig->extra) | |
599 | { | |
600 | if (orig->extra->ecommunity) | |
601 | new->extra->ecommunity = ecommunity_dup(orig->extra->ecommunity); | |
602 | if (orig->extra->cluster) | |
603 | new->extra->cluster = cluster_dup(orig->extra->cluster); | |
604 | if (orig->extra->transit) | |
605 | new->extra->transit = transit_dup(orig->extra->transit); | |
bede7744 LB |
606 | if (orig->extra->encap_subtlvs) |
607 | new->extra->encap_subtlvs = encap_tlv_dup(orig->extra->encap_subtlvs); | |
608 | #if ENABLE_BGP_VNC | |
609 | if (orig->extra->vnc_subtlvs) | |
610 | new->extra->vnc_subtlvs = encap_tlv_dup(orig->extra->vnc_subtlvs); | |
611 | #endif | |
73ac8160 DS |
612 | } |
613 | } | |
614 | ||
615 | void | |
616 | bgp_attr_deep_free (struct attr *attr) | |
617 | { | |
618 | if (attr->aspath) | |
619 | aspath_free(attr->aspath); | |
620 | ||
621 | if (attr->community) | |
622 | community_free(attr->community); | |
623 | ||
624 | if (attr->extra) | |
625 | { | |
626 | if (attr->extra->ecommunity) | |
627 | ecommunity_free(&attr->extra->ecommunity); | |
628 | if (attr->extra->cluster) | |
629 | cluster_free(attr->extra->cluster); | |
630 | if (attr->extra->transit) | |
631 | transit_free(attr->extra->transit); | |
bede7744 LB |
632 | if (attr->extra->encap_subtlvs) |
633 | encap_free(attr->extra->encap_subtlvs); | |
634 | #if ENABLE_BGP_VNC | |
635 | if (attr->extra->vnc_subtlvs) | |
636 | encap_free(attr->extra->vnc_subtlvs); | |
637 | #endif | |
73ac8160 DS |
638 | } |
639 | } | |
640 | ||
cbdfbaa5 PJ |
641 | unsigned long int |
642 | attr_count (void) | |
643 | { | |
644 | return attrhash->count; | |
645 | } | |
646 | ||
647 | unsigned long int | |
648 | attr_unknown_count (void) | |
649 | { | |
650 | return transit_hash->count; | |
651 | } | |
652 | ||
718e3744 | 653 | unsigned int |
923de654 | 654 | attrhash_key_make (void *p) |
718e3744 | 655 | { |
7fb0cd82 JBD |
656 | const struct attr *attr = (struct attr *) p; |
657 | const struct attr_extra *extra = attr->extra; | |
c8e7b895 SH |
658 | uint32_t key = 0; |
659 | #define MIX(val) key = jhash_1word(val, key) | |
660 | ||
661 | MIX(attr->origin); | |
662 | MIX(attr->nexthop.s_addr); | |
663 | MIX(attr->med); | |
664 | MIX(attr->local_pref); | |
718e3744 | 665 | |
c8f3fe30 PJ |
666 | key += attr->origin; |
667 | key += attr->nexthop.s_addr; | |
668 | key += attr->med; | |
669 | key += attr->local_pref; | |
fb982c25 | 670 | |
7fb0cd82 | 671 | if (extra) |
fb982c25 | 672 | { |
7fb0cd82 JBD |
673 | MIX(extra->aggregator_as); |
674 | MIX(extra->aggregator_addr.s_addr); | |
675 | MIX(extra->weight); | |
676 | MIX(extra->mp_nexthop_global_in.s_addr); | |
689bb66c | 677 | MIX(extra->originator_id.s_addr); |
0d9551dc | 678 | MIX(extra->tag); |
fb982c25 PJ |
679 | } |
680 | ||
718e3744 | 681 | if (attr->aspath) |
c8e7b895 | 682 | MIX(aspath_key_make (attr->aspath)); |
718e3744 | 683 | if (attr->community) |
c8e7b895 | 684 | MIX(community_hash_make (attr->community)); |
fb982c25 | 685 | |
7fb0cd82 | 686 | if (extra) |
fb982c25 | 687 | { |
57d187bc | 688 | if (extra->lcommunity) |
2acb4ac2 | 689 | MIX(lcommunity_hash_make (extra->lcommunity)); |
7fb0cd82 JBD |
690 | if (extra->ecommunity) |
691 | MIX(ecommunity_hash_make (extra->ecommunity)); | |
692 | if (extra->cluster) | |
693 | MIX(cluster_hash_key_make (extra->cluster)); | |
694 | if (extra->transit) | |
695 | MIX(transit_hash_key_make (extra->transit)); | |
bede7744 LB |
696 | if (extra->encap_subtlvs) |
697 | MIX(encap_hash_key_make (extra->encap_subtlvs)); | |
698 | #if ENABLE_BGP_VNC | |
699 | if (extra->vnc_subtlvs) | |
700 | MIX(encap_hash_key_make (extra->vnc_subtlvs)); | |
701 | #endif | |
7fb0cd82 | 702 | MIX(extra->mp_nexthop_len); |
801a9bcc DS |
703 | key = jhash(extra->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); |
704 | key = jhash(extra->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
fb982c25 | 705 | } |
718e3744 | 706 | |
707 | return key; | |
708 | } | |
709 | ||
710 | int | |
ffe11cfb | 711 | attrhash_cmp (const void *p1, const void *p2) |
718e3744 | 712 | { |
ffe11cfb SH |
713 | const struct attr * attr1 = p1; |
714 | const struct attr * attr2 = p2; | |
923de654 | 715 | |
718e3744 | 716 | if (attr1->flag == attr2->flag |
717 | && attr1->origin == attr2->origin | |
718 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
fb982c25 PJ |
719 | && attr1->aspath == attr2->aspath |
720 | && attr1->community == attr2->community | |
718e3744 | 721 | && attr1->med == attr2->med |
3f9c7369 DS |
722 | && attr1->local_pref == attr2->local_pref |
723 | && attr1->rmap_change_flags == attr2->rmap_change_flags) | |
fb982c25 | 724 | { |
ffe11cfb SH |
725 | const struct attr_extra *ae1 = attr1->extra; |
726 | const struct attr_extra *ae2 = attr2->extra; | |
fb982c25 PJ |
727 | |
728 | if (ae1 && ae2 | |
729 | && ae1->aggregator_as == ae2->aggregator_as | |
730 | && ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr | |
731 | && ae1->weight == ae2->weight | |
0d9551dc | 732 | && ae1->tag == ae2->tag |
fb982c25 PJ |
733 | && ae1->mp_nexthop_len == ae2->mp_nexthop_len |
734 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global) | |
735 | && IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local) | |
fb982c25 PJ |
736 | && IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in) |
737 | && ae1->ecommunity == ae2->ecommunity | |
57d187bc | 738 | && ae1->lcommunity == ae2->lcommunity |
fb982c25 | 739 | && ae1->cluster == ae2->cluster |
689bb66c | 740 | && ae1->transit == ae2->transit |
f4c89855 LB |
741 | && (ae1->encap_tunneltype == ae2->encap_tunneltype) |
742 | && encap_same(ae1->encap_subtlvs, ae2->encap_subtlvs) | |
65efcfce LB |
743 | #if ENABLE_BGP_VNC |
744 | && encap_same(ae1->vnc_subtlvs, ae2->vnc_subtlvs) | |
745 | #endif | |
684a7227 PG |
746 | && IPV4_ADDR_SAME (&ae1->originator_id, &ae2->originator_id) |
747 | && overlay_index_same(ae1, ae2)) | |
fb982c25 PJ |
748 | return 1; |
749 | else if (ae1 || ae2) | |
750 | return 0; | |
751 | /* neither attribute has extra attributes, so they're same */ | |
752 | return 1; | |
753 | } | |
718e3744 | 754 | else |
755 | return 0; | |
756 | } | |
757 | ||
94f2b392 | 758 | static void |
ffe11cfb | 759 | attrhash_init (void) |
718e3744 | 760 | { |
761 | attrhash = hash_create (attrhash_key_make, attrhash_cmp); | |
762 | } | |
763 | ||
289d2501 LB |
764 | /* |
765 | * special for hash_clean below | |
766 | */ | |
767 | static void | |
768 | attr_vfree (void *attr) | |
769 | { | |
770 | bgp_attr_extra_free ((struct attr *)attr); | |
771 | XFREE (MTYPE_ATTR, attr); | |
772 | } | |
773 | ||
228da428 CC |
774 | static void |
775 | attrhash_finish (void) | |
776 | { | |
289d2501 | 777 | hash_clean(attrhash, attr_vfree); |
228da428 CC |
778 | hash_free (attrhash); |
779 | attrhash = NULL; | |
780 | } | |
781 | ||
94f2b392 | 782 | static void |
718e3744 | 783 | attr_show_all_iterator (struct hash_backet *backet, struct vty *vty) |
784 | { | |
785 | struct attr *attr = backet->data; | |
786 | ||
787 | vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt, | |
788 | inet_ntoa (attr->nexthop), VTY_NEWLINE); | |
789 | } | |
790 | ||
791 | void | |
792 | attr_show_all (struct vty *vty) | |
793 | { | |
794 | hash_iterate (attrhash, | |
795 | (void (*)(struct hash_backet *, void *)) | |
796 | attr_show_all_iterator, | |
797 | vty); | |
798 | } | |
799 | ||
94f2b392 | 800 | static void * |
923de654 | 801 | bgp_attr_hash_alloc (void *p) |
718e3744 | 802 | { |
ffd0c037 | 803 | const struct attr * val = (const struct attr *) p; |
718e3744 | 804 | struct attr *attr; |
805 | ||
806 | attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr)); | |
807 | *attr = *val; | |
fb982c25 PJ |
808 | if (val->extra) |
809 | { | |
810 | attr->extra = bgp_attr_extra_new (); | |
811 | *attr->extra = *val->extra; | |
bede7744 LB |
812 | if (val->extra->encap_subtlvs) { |
813 | val->extra->encap_subtlvs = NULL; | |
f4c89855 | 814 | } |
65efcfce | 815 | #if ENABLE_BGP_VNC |
bede7744 LB |
816 | if (val->extra->vnc_subtlvs) { |
817 | val->extra->vnc_subtlvs = NULL; | |
65efcfce LB |
818 | } |
819 | #endif | |
fb982c25 | 820 | } |
718e3744 | 821 | attr->refcnt = 0; |
822 | return attr; | |
823 | } | |
824 | ||
825 | /* Internet argument attribute. */ | |
826 | struct attr * | |
827 | bgp_attr_intern (struct attr *attr) | |
828 | { | |
829 | struct attr *find; | |
830 | ||
831 | /* Intern referenced strucutre. */ | |
832 | if (attr->aspath) | |
833 | { | |
834 | if (! attr->aspath->refcnt) | |
835 | attr->aspath = aspath_intern (attr->aspath); | |
836 | else | |
837 | attr->aspath->refcnt++; | |
838 | } | |
839 | if (attr->community) | |
840 | { | |
841 | if (! attr->community->refcnt) | |
842 | attr->community = community_intern (attr->community); | |
843 | else | |
844 | attr->community->refcnt++; | |
845 | } | |
fb982c25 | 846 | if (attr->extra) |
718e3744 | 847 | { |
fb982c25 PJ |
848 | struct attr_extra *attre = attr->extra; |
849 | ||
850 | if (attre->ecommunity) | |
851 | { | |
852 | if (! attre->ecommunity->refcnt) | |
853 | attre->ecommunity = ecommunity_intern (attre->ecommunity); | |
854 | else | |
855 | attre->ecommunity->refcnt++; | |
f6f434b2 | 856 | |
fb982c25 | 857 | } |
57d187bc JS |
858 | if (attre->lcommunity) |
859 | { | |
860 | if (! attre->lcommunity->refcnt) | |
861 | attre->lcommunity = lcommunity_intern (attre->lcommunity); | |
862 | else | |
863 | attre->lcommunity->refcnt++; | |
864 | } | |
fb982c25 PJ |
865 | if (attre->cluster) |
866 | { | |
867 | if (! attre->cluster->refcnt) | |
868 | attre->cluster = cluster_intern (attre->cluster); | |
869 | else | |
870 | attre->cluster->refcnt++; | |
871 | } | |
872 | if (attre->transit) | |
873 | { | |
874 | if (! attre->transit->refcnt) | |
875 | attre->transit = transit_intern (attre->transit); | |
876 | else | |
877 | attre->transit->refcnt++; | |
878 | } | |
bede7744 LB |
879 | if (attre->encap_subtlvs) |
880 | { | |
881 | if (! attre->encap_subtlvs->refcnt) | |
882 | attre->encap_subtlvs = encap_intern (attre->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
883 | else | |
884 | attre->encap_subtlvs->refcnt++; | |
885 | } | |
886 | #if ENABLE_BGP_VNC | |
887 | if (attre->vnc_subtlvs) | |
888 | { | |
889 | if (! attre->vnc_subtlvs->refcnt) | |
890 | attre->vnc_subtlvs = encap_intern (attre->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
891 | else | |
892 | attre->vnc_subtlvs->refcnt++; | |
893 | } | |
894 | #endif | |
718e3744 | 895 | } |
f6f434b2 | 896 | |
718e3744 | 897 | find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc); |
898 | find->refcnt++; | |
bede7744 | 899 | |
718e3744 | 900 | return find; |
901 | } | |
902 | ||
3f9c7369 DS |
903 | /** |
904 | * Increment the refcount on various structures that attr holds. | |
905 | * Note on usage: call _only_ when the 'attr' object has already | |
906 | * been 'intern'ed and exists in 'attrhash' table. The function | |
907 | * serves to hold a reference to that (real) object. | |
908 | * Note also that the caller can safely call bgp_attr_unintern() | |
909 | * after calling bgp_attr_refcount(). That would release the | |
910 | * reference and could result in a free() of the attr object. | |
911 | */ | |
912 | struct attr * | |
913 | bgp_attr_refcount (struct attr *attr) | |
914 | { | |
915 | /* Intern referenced strucutre. */ | |
916 | if (attr->aspath) | |
917 | attr->aspath->refcnt++; | |
918 | ||
919 | if (attr->community) | |
920 | attr->community->refcnt++; | |
921 | ||
922 | if (attr->extra) | |
923 | { | |
924 | struct attr_extra *attre = attr->extra; | |
925 | if (attre->ecommunity) | |
926 | attre->ecommunity->refcnt++; | |
927 | ||
928 | if (attre->cluster) | |
929 | attre->cluster->refcnt++; | |
930 | ||
931 | if (attre->transit) | |
932 | attre->transit->refcnt++; | |
bede7744 LB |
933 | |
934 | if (attre->encap_subtlvs) | |
935 | attre->encap_subtlvs->refcnt++; | |
936 | ||
937 | #if ENABLE_BGP_VNC | |
938 | if (attre->vnc_subtlvs) | |
939 | attre->vnc_subtlvs->refcnt++; | |
940 | #endif | |
3f9c7369 DS |
941 | } |
942 | attr->refcnt++; | |
943 | return attr; | |
944 | } | |
03e214c8 | 945 | |
718e3744 | 946 | /* Make network statement's attribute. */ |
947 | struct attr * | |
948 | bgp_attr_default_set (struct attr *attr, u_char origin) | |
949 | { | |
950 | memset (attr, 0, sizeof (struct attr)); | |
fb982c25 PJ |
951 | bgp_attr_extra_get (attr); |
952 | ||
718e3744 | 953 | attr->origin = origin; |
954 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
955 | attr->aspath = aspath_empty (); | |
956 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
fb982c25 | 957 | attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT; |
0d9551dc | 958 | attr->extra->tag = 0; |
718e3744 | 959 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
fb982c25 | 960 | attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN; |
03e214c8 | 961 | |
718e3744 | 962 | return attr; |
963 | } | |
964 | ||
03e214c8 | 965 | |
718e3744 | 966 | /* Make network statement's attribute. */ |
967 | struct attr * | |
968 | bgp_attr_default_intern (u_char origin) | |
969 | { | |
970 | struct attr attr; | |
971 | struct attr *new; | |
e16a4133 | 972 | |
f4c89855 LB |
973 | memset (&attr, 0, sizeof (struct attr)); |
974 | bgp_attr_extra_get (&attr); | |
975 | ||
03e214c8 | 976 | bgp_attr_default_set(&attr, origin); |
718e3744 | 977 | |
978 | new = bgp_attr_intern (&attr); | |
fb982c25 PJ |
979 | bgp_attr_extra_free (&attr); |
980 | ||
f6f434b2 | 981 | aspath_unintern (&new->aspath); |
718e3744 | 982 | return new; |
983 | } | |
984 | ||
b5d58c32 | 985 | /* Create the attributes for an aggregate */ |
718e3744 | 986 | struct attr * |
987 | bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin, | |
988 | struct aspath *aspath, | |
42f7e184 DS |
989 | struct community *community, int as_set, |
990 | u_char atomic_aggregate) | |
718e3744 | 991 | { |
992 | struct attr attr; | |
993 | struct attr *new; | |
938ef3a2 | 994 | struct attr_extra attre; |
718e3744 | 995 | |
996 | memset (&attr, 0, sizeof (struct attr)); | |
938ef3a2 JBD |
997 | memset (&attre, 0, sizeof (struct attr_extra)); |
998 | attr.extra = &attre; | |
999 | ||
718e3744 | 1000 | /* Origin attribute. */ |
1001 | attr.origin = origin; | |
1002 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
1003 | ||
1004 | /* AS path attribute. */ | |
1005 | if (aspath) | |
1006 | attr.aspath = aspath_intern (aspath); | |
1007 | else | |
1008 | attr.aspath = aspath_empty (); | |
1009 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
1010 | ||
1011 | /* Next hop attribute. */ | |
1012 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); | |
1013 | ||
1014 | if (community) | |
1015 | { | |
1016 | attr.community = community; | |
1017 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); | |
1018 | } | |
1019 | ||
938ef3a2 | 1020 | attre.weight = BGP_ATTR_DEFAULT_WEIGHT; |
938ef3a2 | 1021 | attre.mp_nexthop_len = IPV6_MAX_BYTELEN; |
42f7e184 | 1022 | if (! as_set || atomic_aggregate) |
718e3744 | 1023 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); |
1024 | attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1025 | if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION)) | |
938ef3a2 | 1026 | attre.aggregator_as = bgp->confed_id; |
718e3744 | 1027 | else |
938ef3a2 JBD |
1028 | attre.aggregator_as = bgp->as; |
1029 | attre.aggregator_addr = bgp->router_id; | |
718e3744 | 1030 | |
1031 | new = bgp_attr_intern (&attr); | |
938ef3a2 | 1032 | |
f6f434b2 | 1033 | aspath_unintern (&new->aspath); |
718e3744 | 1034 | return new; |
1035 | } | |
1036 | ||
b881c707 PJ |
1037 | /* Unintern just the sub-components of the attr, but not the attr */ |
1038 | void | |
1039 | bgp_attr_unintern_sub (struct attr *attr) | |
1040 | { | |
1041 | /* aspath refcount shoud be decrement. */ | |
1042 | if (attr->aspath) | |
1043 | aspath_unintern (&attr->aspath); | |
d92a2f39 | 1044 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)); |
b881c707 PJ |
1045 | |
1046 | if (attr->community) | |
1047 | community_unintern (&attr->community); | |
d92a2f39 | 1048 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)); |
b881c707 PJ |
1049 | |
1050 | if (attr->extra) | |
1051 | { | |
1052 | if (attr->extra->ecommunity) | |
1053 | ecommunity_unintern (&attr->extra->ecommunity); | |
d92a2f39 | 1054 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES)); |
57d187bc JS |
1055 | |
1056 | if (attr->extra->lcommunity) | |
1057 | lcommunity_unintern (&attr->extra->lcommunity); | |
1058 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES)); | |
2acb4ac2 | 1059 | |
b881c707 PJ |
1060 | if (attr->extra->cluster) |
1061 | cluster_unintern (attr->extra->cluster); | |
d92a2f39 | 1062 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST)); |
b881c707 PJ |
1063 | |
1064 | if (attr->extra->transit) | |
1065 | transit_unintern (attr->extra->transit); | |
bede7744 LB |
1066 | |
1067 | if (attr->extra->encap_subtlvs) | |
1068 | encap_unintern (&attr->extra->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
1069 | ||
1070 | #if ENABLE_BGP_VNC | |
1071 | if (attr->extra->vnc_subtlvs) | |
1072 | encap_unintern (&attr->extra->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1073 | #endif | |
b881c707 PJ |
1074 | } |
1075 | } | |
1076 | ||
718e3744 | 1077 | /* Free bgp attribute and aspath. */ |
1078 | void | |
1a2fd707 | 1079 | bgp_attr_unintern (struct attr **pattr) |
718e3744 | 1080 | { |
1a2fd707 | 1081 | struct attr *attr = *pattr; |
718e3744 | 1082 | struct attr *ret; |
b881c707 | 1083 | struct attr tmp; |
b9f1dca1 | 1084 | struct attr_extra tmp_extra; |
f6f434b2 | 1085 | |
718e3744 | 1086 | /* Decrement attribute reference. */ |
1a2fd707 | 1087 | attr->refcnt--; |
b881c707 | 1088 | |
1a2fd707 | 1089 | tmp = *attr; |
b881c707 | 1090 | |
1a2fd707 | 1091 | if (attr->extra) |
fb982c25 | 1092 | { |
b9f1dca1 | 1093 | tmp.extra = &tmp_extra; |
1a2fd707 | 1094 | memcpy (tmp.extra, attr->extra, sizeof (struct attr_extra)); |
fb982c25 | 1095 | } |
f6f434b2 | 1096 | |
718e3744 | 1097 | /* If reference becomes zero then free attribute object. */ |
1a2fd707 JBD |
1098 | if (attr->refcnt == 0) |
1099 | { | |
1100 | ret = hash_release (attrhash, attr); | |
718e3744 | 1101 | assert (ret != NULL); |
1a2fd707 JBD |
1102 | bgp_attr_extra_free (attr); |
1103 | XFREE (MTYPE_ATTR, attr); | |
1104 | *pattr = NULL; | |
718e3744 | 1105 | } |
1106 | ||
b881c707 | 1107 | bgp_attr_unintern_sub (&tmp); |
718e3744 | 1108 | } |
1109 | ||
1110 | void | |
1111 | bgp_attr_flush (struct attr *attr) | |
1112 | { | |
1113 | if (attr->aspath && ! attr->aspath->refcnt) | |
f9a3a260 LB |
1114 | { |
1115 | aspath_free (attr->aspath); | |
1116 | attr->aspath = NULL; | |
1117 | } | |
718e3744 | 1118 | if (attr->community && ! attr->community->refcnt) |
f9a3a260 LB |
1119 | { |
1120 | community_free (attr->community); | |
1121 | attr->community = NULL; | |
1122 | } | |
fb982c25 PJ |
1123 | if (attr->extra) |
1124 | { | |
1125 | struct attr_extra *attre = attr->extra; | |
f6f434b2 | 1126 | |
fb982c25 | 1127 | if (attre->ecommunity && ! attre->ecommunity->refcnt) |
f6f434b2 | 1128 | ecommunity_free (&attre->ecommunity); |
57d187bc | 1129 | if (attre->lcommunity && ! attre->lcommunity->refcnt) |
2acb4ac2 | 1130 | lcommunity_free (&attre->lcommunity); |
fb982c25 | 1131 | if (attre->cluster && ! attre->cluster->refcnt) |
f9a3a260 LB |
1132 | { |
1133 | cluster_free (attre->cluster); | |
1134 | attre->cluster = NULL; | |
1135 | } | |
fb982c25 | 1136 | if (attre->transit && ! attre->transit->refcnt) |
f9a3a260 LB |
1137 | { |
1138 | transit_free (attre->transit); | |
1139 | attre->transit = NULL; | |
1140 | } | |
bede7744 LB |
1141 | if (attre->encap_subtlvs && ! attre->encap_subtlvs->refcnt) |
1142 | { | |
1143 | encap_free(attre->encap_subtlvs); | |
1144 | attre->encap_subtlvs = NULL; | |
1145 | } | |
65efcfce | 1146 | #if ENABLE_BGP_VNC |
bede7744 LB |
1147 | if (attre->vnc_subtlvs && ! attre->vnc_subtlvs->refcnt) |
1148 | { | |
1149 | encap_free(attre->vnc_subtlvs); | |
1150 | attre->vnc_subtlvs = NULL; | |
1151 | } | |
65efcfce | 1152 | #endif |
fb982c25 | 1153 | } |
718e3744 | 1154 | } |
1155 | ||
b881c707 PJ |
1156 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1157 | * avoid resetting sessions for malformed attributes which are | |
1158 | * are partial/optional and hence where the error likely was not | |
1159 | * introduced by the sending neighbour. | |
1160 | */ | |
1161 | static bgp_attr_parse_ret_t | |
835315bf PJ |
1162 | bgp_attr_malformed (struct bgp_attr_parser_args *args, u_char subcode, |
1163 | bgp_size_t length) | |
b881c707 | 1164 | { |
835315bf PJ |
1165 | struct peer *const peer = args->peer; |
1166 | const u_int8_t flags = args->flags; | |
1167 | /* startp and length must be special-cased, as whether or not to | |
1168 | * send the attribute data with the NOTIFY depends on the error, | |
1169 | * the caller therefore signals this with the seperate length argument | |
1170 | */ | |
bd471fea | 1171 | u_char *notify_datap = (length > 0 ? args->startp : NULL); |
835315bf | 1172 | |
b881c707 | 1173 | /* Only relax error handling for eBGP peers */ |
6d85b15b | 1174 | if (peer->sort != BGP_PEER_EBGP) |
b881c707 PJ |
1175 | { |
1176 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1177 | notify_datap, length); |
b881c707 PJ |
1178 | return BGP_ATTR_PARSE_ERROR; |
1179 | ||
1180 | } | |
1181 | ||
bd471fea PJ |
1182 | /* Adjust the stream getp to the end of the attribute, in case we can |
1183 | * still proceed but the caller hasn't read all the attribute. | |
1184 | */ | |
1185 | stream_set_getp (BGP_INPUT (peer), | |
1186 | (args->startp - STREAM_DATA (BGP_INPUT (peer))) | |
1187 | + args->total); | |
1188 | ||
835315bf | 1189 | switch (args->type) { |
fa61e16d PJ |
1190 | /* where an attribute is relatively inconsequential, e.g. it does not |
1191 | * affect route selection, and can be safely ignored, then any such | |
1192 | * attributes which are malformed should just be ignored and the route | |
1193 | * processed as normal. | |
b881c707 PJ |
1194 | */ |
1195 | case BGP_ATTR_AS4_AGGREGATOR: | |
1196 | case BGP_ATTR_AGGREGATOR: | |
1197 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1198 | return BGP_ATTR_PARSE_PROCEED; | |
1199 | ||
1200 | /* Core attributes, particularly ones which may influence route | |
fa61e16d | 1201 | * selection, should always cause session resets |
b881c707 PJ |
1202 | */ |
1203 | case BGP_ATTR_ORIGIN: | |
1204 | case BGP_ATTR_AS_PATH: | |
1205 | case BGP_ATTR_NEXT_HOP: | |
1206 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1207 | case BGP_ATTR_LOCAL_PREF: | |
1208 | case BGP_ATTR_COMMUNITIES: | |
1209 | case BGP_ATTR_ORIGINATOR_ID: | |
1210 | case BGP_ATTR_CLUSTER_LIST: | |
1211 | case BGP_ATTR_MP_REACH_NLRI: | |
1212 | case BGP_ATTR_MP_UNREACH_NLRI: | |
1213 | case BGP_ATTR_EXT_COMMUNITIES: | |
1214 | bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
bd471fea | 1215 | notify_datap, length); |
b881c707 PJ |
1216 | return BGP_ATTR_PARSE_ERROR; |
1217 | } | |
1218 | ||
1219 | /* Partial optional attributes that are malformed should not cause | |
1220 | * the whole session to be reset. Instead treat it as a withdrawal | |
1221 | * of the routes, if possible. | |
1222 | */ | |
835315bf PJ |
1223 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS) |
1224 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1225 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
b881c707 PJ |
1226 | return BGP_ATTR_PARSE_WITHDRAW; |
1227 | ||
1228 | /* default to reset */ | |
f57000c0 | 1229 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
b881c707 PJ |
1230 | } |
1231 | ||
afcb7679 DO |
1232 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1233 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1234 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1235 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1236 | non-transitive" attribute. */ | |
1237 | static void | |
835315bf PJ |
1238 | bgp_attr_flags_diagnose (struct bgp_attr_parser_args *args, |
1239 | u_int8_t desired_flags /* how RFC says it must be */ | |
afcb7679 DO |
1240 | ) |
1241 | { | |
1242 | u_char seen = 0, i; | |
835315bf PJ |
1243 | u_char real_flags = args->flags; |
1244 | const u_int8_t attr_code = args->type; | |
1245 | ||
afcb7679 DO |
1246 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; |
1247 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1248 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1249 | if | |
1250 | ( | |
1251 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) != | |
1252 | CHECK_FLAG (real_flags, attr_flag_str[i].key) | |
1253 | ) | |
1254 | { | |
16286195 DS |
1255 | zlog_err ("%s attribute must%s be flagged as \"%s\"", |
1256 | LOOKUP (attr_str, attr_code), | |
1257 | CHECK_FLAG (desired_flags, attr_flag_str[i].key) ? "" : " not", | |
1258 | attr_flag_str[i].str); | |
afcb7679 DO |
1259 | seen = 1; |
1260 | } | |
fa5831e8 PJ |
1261 | if (!seen) |
1262 | { | |
16286195 DS |
1263 | zlog_debug ("Strange, %s called for attr %s, but no problem found with flags" |
1264 | " (real flags 0x%x, desired 0x%x)", | |
1265 | __func__, LOOKUP (attr_str, attr_code), | |
1266 | real_flags, desired_flags); | |
fa5831e8 | 1267 | } |
afcb7679 DO |
1268 | } |
1269 | ||
3ecab4c8 PJ |
1270 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1271 | * as will PARTIAL for optional+transitive attributes. | |
1272 | */ | |
1273 | const u_int8_t attr_flags_values [] = { | |
1274 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1275 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1276 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1277 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1278 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1279 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1280 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1281 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1282 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1283 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1284 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1285 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1286 | [BGP_ATTR_EXT_COMMUNITIES] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1287 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1288 | [BGP_ATTR_AS4_AGGREGATOR] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
2acb4ac2 | 1289 | [BGP_ATTR_LARGE_COMMUNITIES]= BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
3ecab4c8 | 1290 | }; |
099111ef | 1291 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 PJ |
1292 | |
1293 | static int | |
835315bf | 1294 | bgp_attr_flag_invalid (struct bgp_attr_parser_args *args) |
3ecab4c8 PJ |
1295 | { |
1296 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
835315bf PJ |
1297 | const u_int8_t flags = args->flags; |
1298 | const u_int8_t attr_code = args->type; | |
3ecab4c8 PJ |
1299 | |
1300 | /* there may be attributes we don't know about */ | |
1301 | if (attr_code > attr_flags_values_max) | |
1302 | return 0; | |
1303 | if (attr_flags_values[attr_code] == 0) | |
1304 | return 0; | |
1305 | ||
1306 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set to | |
1307 | * 1." | |
1308 | */ | |
1309 | if (!CHECK_FLAG (BGP_ATTR_FLAG_OPTIONAL, flags) | |
1310 | && !CHECK_FLAG (BGP_ATTR_FLAG_TRANS, flags)) | |
1311 | { | |
16286195 DS |
1312 | zlog_err ("%s well-known attributes must have transitive flag set (%x)", |
1313 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1314 | return 1; |
1315 | } | |
1316 | ||
1317 | /* "For well-known attributes and for optional non-transitive attributes, | |
1318 | * the Partial bit MUST be set to 0." | |
1319 | */ | |
1320 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_PARTIAL)) | |
1321 | { | |
1322 | if (!CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL)) | |
1323 | { | |
16286195 DS |
1324 | zlog_err ("%s well-known attribute " |
1325 | "must NOT have the partial flag set (%x)", | |
1326 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1327 | return 1; |
1328 | } | |
1329 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1330 | && !CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1331 | { | |
16286195 DS |
1332 | zlog_err ("%s optional + transitive attribute " |
1333 | "must NOT have the partial flag set (%x)", | |
1334 | LOOKUP (attr_str, attr_code), flags); | |
3ecab4c8 PJ |
1335 | return 1; |
1336 | } | |
1337 | } | |
1338 | ||
1339 | /* Optional transitive attributes may go through speakers that don't | |
1340 | * reocgnise them and set the Partial bit. | |
1341 | */ | |
1342 | if (CHECK_FLAG (flags, BGP_ATTR_FLAG_OPTIONAL) | |
1343 | && CHECK_FLAG (flags, BGP_ATTR_FLAG_TRANS)) | |
1344 | SET_FLAG (mask, BGP_ATTR_FLAG_PARTIAL); | |
1345 | ||
683f2b86 | 1346 | if ((flags & ~mask) |
3ecab4c8 PJ |
1347 | == attr_flags_values[attr_code]) |
1348 | return 0; | |
1349 | ||
835315bf | 1350 | bgp_attr_flags_diagnose (args, attr_flags_values[attr_code]); |
3ecab4c8 PJ |
1351 | return 1; |
1352 | } | |
1353 | ||
718e3744 | 1354 | /* Get origin attribute of the update message. */ |
b881c707 | 1355 | static bgp_attr_parse_ret_t |
835315bf | 1356 | bgp_attr_origin (struct bgp_attr_parser_args *args) |
718e3744 | 1357 | { |
835315bf PJ |
1358 | struct peer *const peer = args->peer; |
1359 | struct attr *const attr = args->attr; | |
1360 | const bgp_size_t length = args->length; | |
1361 | ||
718e3744 | 1362 | /* If any recognized attribute has Attribute Length that conflicts |
1363 | with the expected length (based on the attribute type code), then | |
1364 | the Error Subcode is set to Attribute Length Error. The Data | |
1365 | field contains the erroneous attribute (type, length and | |
1366 | value). */ | |
1367 | if (length != 1) | |
1368 | { | |
16286195 | 1369 | zlog_err ("Origin attribute length is not one %d", length); |
835315bf | 1370 | return bgp_attr_malformed (args, |
b881c707 | 1371 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1372 | args->total); |
718e3744 | 1373 | } |
1374 | ||
1375 | /* Fetch origin attribute. */ | |
1376 | attr->origin = stream_getc (BGP_INPUT (peer)); | |
1377 | ||
1378 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1379 | Subcode is set to Invalid Origin Attribute. The Data field | |
1380 | contains the unrecognized attribute (type, length and value). */ | |
1381 | if ((attr->origin != BGP_ORIGIN_IGP) | |
1382 | && (attr->origin != BGP_ORIGIN_EGP) | |
1383 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) | |
1384 | { | |
16286195 | 1385 | zlog_err ("Origin attribute value is invalid %d", attr->origin); |
835315bf | 1386 | return bgp_attr_malformed (args, |
b881c707 | 1387 | BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
835315bf | 1388 | args->total); |
718e3744 | 1389 | } |
1390 | ||
1391 | /* Set oring attribute flag. */ | |
1392 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN); | |
1393 | ||
1394 | return 0; | |
1395 | } | |
ab005298 PJ |
1396 | |
1397 | /* Parse AS path information. This function is wrapper of | |
1398 | aspath_parse. */ | |
1399 | static int | |
835315bf | 1400 | bgp_attr_aspath (struct bgp_attr_parser_args *args) |
718e3744 | 1401 | { |
835315bf PJ |
1402 | struct attr *const attr = args->attr; |
1403 | struct peer *const peer = args->peer; | |
1404 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1405 | |
ab005298 PJ |
1406 | /* |
1407 | * peer with AS4 => will get 4Byte ASnums | |
1408 | * otherwise, will get 16 Bit | |
0b2aa3a0 | 1409 | */ |
ab005298 PJ |
1410 | attr->aspath = aspath_parse (peer->ibuf, length, |
1411 | CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)); | |
0b2aa3a0 | 1412 | |
ab005298 PJ |
1413 | /* In case of IBGP, length will be zero. */ |
1414 | if (! attr->aspath) | |
cddb8112 | 1415 | { |
16286195 | 1416 | zlog_err ("Malformed AS path from %s, length is %d", peer->host, length); |
835315bf | 1417 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, 0); |
cddb8112 | 1418 | } |
cddb8112 | 1419 | |
ab005298 PJ |
1420 | /* Set aspath attribute flag. */ |
1421 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH); | |
0b2aa3a0 | 1422 | |
b881c707 | 1423 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1424 | } |
1425 | ||
b881c707 | 1426 | static bgp_attr_parse_ret_t |
835315bf | 1427 | bgp_attr_aspath_check (struct peer *const peer, struct attr *const attr) |
0b2aa3a0 PJ |
1428 | { |
1429 | /* These checks were part of bgp_attr_aspath, but with | |
1430 | * as4 we should to check aspath things when | |
1431 | * aspath synthesizing with as4_path has already taken place. | |
1432 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1433 | * not right. | |
1434 | * So do the checks later, i.e. here | |
1435 | */ | |
1436 | struct bgp *bgp = peer->bgp; | |
1437 | struct aspath *aspath; | |
1438 | ||
ca87e1d3 | 1439 | /* Confederation sanity check. */ |
6d85b15b JBD |
1440 | if ((peer->sort == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) || |
1441 | (peer->sort == BGP_PEER_EBGP && aspath_confed_check (attr->aspath))) | |
ca87e1d3 | 1442 | { |
16286195 | 1443 | zlog_err ("Malformed AS path from %s", peer->host); |
835315bf PJ |
1444 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1445 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1446 | return BGP_ATTR_PARSE_ERROR; | |
ca87e1d3 VT |
1447 | } |
1448 | ||
718e3744 | 1449 | /* First AS check for EBGP. */ |
1450 | if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS)) | |
1451 | { | |
6d85b15b | 1452 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 1453 | && ! aspath_firstas_check (attr->aspath, peer->as)) |
1454 | { | |
16286195 | 1455 | zlog_err ("%s incorrect first AS (must be %u)", peer->host, peer->as); |
835315bf PJ |
1456 | bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR, |
1457 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1458 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 1459 | } |
1460 | } | |
1461 | ||
1462 | /* local-as prepend */ | |
1463 | if (peer->change_local_as && | |
1464 | ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) | |
1465 | { | |
1466 | aspath = aspath_dup (attr->aspath); | |
1467 | aspath = aspath_add_seq (aspath, peer->change_local_as); | |
f6f434b2 | 1468 | aspath_unintern (&attr->aspath); |
718e3744 | 1469 | attr->aspath = aspath_intern (aspath); |
1470 | } | |
1471 | ||
b881c707 | 1472 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1473 | } |
1474 | ||
ab005298 PJ |
1475 | /* Parse AS4 path information. This function is another wrapper of |
1476 | aspath_parse. */ | |
1477 | static int | |
835315bf | 1478 | bgp_attr_as4_path (struct bgp_attr_parser_args *args, struct aspath **as4_path) |
ab005298 | 1479 | { |
835315bf PJ |
1480 | struct peer *const peer = args->peer; |
1481 | struct attr *const attr = args->attr; | |
1482 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1483 | |
ab005298 PJ |
1484 | *as4_path = aspath_parse (peer->ibuf, length, 1); |
1485 | ||
b881c707 PJ |
1486 | /* In case of IBGP, length will be zero. */ |
1487 | if (!*as4_path) | |
1488 | { | |
16286195 | 1489 | zlog_err ("Malformed AS4 path from %s, length is %d", peer->host, length); |
835315bf | 1490 | return bgp_attr_malformed (args, |
b881c707 | 1491 | BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
835315bf | 1492 | 0); |
b881c707 PJ |
1493 | } |
1494 | ||
ab005298 PJ |
1495 | /* Set aspath attribute flag. */ |
1496 | if (as4_path) | |
1497 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_PATH); | |
1498 | ||
b881c707 | 1499 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1500 | } |
1501 | ||
718e3744 | 1502 | /* Nexthop attribute. */ |
b881c707 | 1503 | static bgp_attr_parse_ret_t |
835315bf | 1504 | bgp_attr_nexthop (struct bgp_attr_parser_args *args) |
718e3744 | 1505 | { |
835315bf PJ |
1506 | struct peer *const peer = args->peer; |
1507 | struct attr *const attr = args->attr; | |
1508 | const bgp_size_t length = args->length; | |
1509 | ||
bc3443eb | 1510 | in_addr_t nexthop_h, nexthop_n; |
718e3744 | 1511 | |
718e3744 | 1512 | /* Check nexthop attribute length. */ |
1513 | if (length != 4) | |
1514 | { | |
16286195 | 1515 | zlog_err ("Nexthop attribute length isn't four [%d]", length); |
718e3744 | 1516 | |
835315bf | 1517 | return bgp_attr_malformed (args, |
b881c707 | 1518 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1519 | args->total); |
718e3744 | 1520 | } |
1521 | ||
58298ccd DS |
1522 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP |
1523 | attribute must result in a NOTIFICATION message (this is implemented below). | |
1524 | At the same time, semantically incorrect NEXT_HOP is more likely to be just | |
1525 | logged locally (this is implemented somewhere else). The UPDATE message | |
1526 | gets ignored in any of these cases. */ | |
bc3443eb DO |
1527 | nexthop_n = stream_get_ipv4 (peer->ibuf); |
1528 | nexthop_h = ntohl (nexthop_n); | |
cebb7440 LB |
1529 | if ((IPV4_NET0 (nexthop_h) || IPV4_NET127 (nexthop_h) || IPV4_CLASS_DE (nexthop_h)) |
1530 | && !BGP_DEBUG (allow_martians, ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
bc3443eb DO |
1531 | { |
1532 | char buf[INET_ADDRSTRLEN]; | |
bb02b823 | 1533 | inet_ntop (AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); |
16286195 | 1534 | zlog_err ("Martian nexthop %s", buf); |
835315bf | 1535 | return bgp_attr_malformed (args, |
bc3443eb | 1536 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, |
835315bf | 1537 | args->total); |
bc3443eb DO |
1538 | } |
1539 | ||
1540 | attr->nexthop.s_addr = nexthop_n; | |
718e3744 | 1541 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP); |
1542 | ||
b881c707 | 1543 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1544 | } |
1545 | ||
1546 | /* MED atrribute. */ | |
b881c707 | 1547 | static bgp_attr_parse_ret_t |
835315bf | 1548 | bgp_attr_med (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; | |
1553 | ||
718e3744 | 1554 | /* Length check. */ |
1555 | if (length != 4) | |
1556 | { | |
16286195 | 1557 | zlog_err ("MED attribute length isn't four [%d]", length); |
b881c707 | 1558 | |
835315bf | 1559 | return bgp_attr_malformed (args, |
b881c707 | 1560 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1561 | args->total); |
718e3744 | 1562 | } |
1563 | ||
1564 | attr->med = stream_getl (peer->ibuf); | |
1565 | ||
1566 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC); | |
1567 | ||
b881c707 | 1568 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1569 | } |
1570 | ||
1571 | /* Local preference attribute. */ | |
b881c707 | 1572 | static bgp_attr_parse_ret_t |
835315bf | 1573 | bgp_attr_local_pref (struct bgp_attr_parser_args *args) |
718e3744 | 1574 | { |
835315bf PJ |
1575 | struct peer *const peer = args->peer; |
1576 | struct attr *const attr = args->attr; | |
1577 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1578 | |
a624cae2 DO |
1579 | /* Length check. */ |
1580 | if (length != 4) | |
1581 | { | |
16286195 | 1582 | zlog_err ("LOCAL_PREF attribute length isn't 4 [%u]", length); |
835315bf | 1583 | return bgp_attr_malformed (args, |
a624cae2 | 1584 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1585 | args->total); |
a624cae2 | 1586 | } |
0ea968d2 | 1587 | |
718e3744 | 1588 | /* If it is contained in an UPDATE message that is received from an |
1589 | external peer, then this attribute MUST be ignored by the | |
1590 | receiving speaker. */ | |
6d85b15b | 1591 | if (peer->sort == BGP_PEER_EBGP) |
718e3744 | 1592 | { |
9985f83c | 1593 | stream_forward_getp (peer->ibuf, length); |
b881c707 | 1594 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1595 | } |
1596 | ||
a624cae2 | 1597 | attr->local_pref = stream_getl (peer->ibuf); |
718e3744 | 1598 | |
1599 | /* Set atomic aggregate flag. */ | |
1600 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF); | |
1601 | ||
b881c707 | 1602 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1603 | } |
1604 | ||
1605 | /* Atomic aggregate. */ | |
94f2b392 | 1606 | static int |
835315bf | 1607 | bgp_attr_atomic (struct bgp_attr_parser_args *args) |
718e3744 | 1608 | { |
835315bf PJ |
1609 | struct attr *const attr = args->attr; |
1610 | const bgp_size_t length = args->length; | |
3ecab4c8 | 1611 | |
9eba2ada | 1612 | /* Length check. */ |
718e3744 | 1613 | if (length != 0) |
1614 | { | |
16286195 | 1615 | zlog_err ("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", length); |
835315bf | 1616 | return bgp_attr_malformed (args, |
b881c707 | 1617 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1618 | args->total); |
718e3744 | 1619 | } |
1620 | ||
1621 | /* Set atomic aggregate flag. */ | |
1622 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE); | |
1623 | ||
b881c707 | 1624 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1625 | } |
1626 | ||
1627 | /* Aggregator attribute */ | |
94f2b392 | 1628 | static int |
835315bf | 1629 | bgp_attr_aggregator (struct bgp_attr_parser_args *args) |
718e3744 | 1630 | { |
835315bf PJ |
1631 | struct peer *const peer = args->peer; |
1632 | struct attr *const attr = args->attr; | |
1633 | const bgp_size_t length = args->length; | |
1634 | ||
0b2aa3a0 | 1635 | int wantedlen = 6; |
fb982c25 | 1636 | struct attr_extra *attre = bgp_attr_extra_get (attr); |
3ecab4c8 | 1637 | |
0b2aa3a0 | 1638 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ |
b881c707 | 1639 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1640 | wantedlen = 8; |
1641 | ||
1642 | if (length != wantedlen) | |
718e3744 | 1643 | { |
16286195 | 1644 | zlog_err ("AGGREGATOR attribute length isn't %u [%u]", wantedlen, length); |
835315bf | 1645 | return bgp_attr_malformed (args, |
b881c707 | 1646 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1647 | args->total); |
718e3744 | 1648 | } |
0b2aa3a0 PJ |
1649 | |
1650 | if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) ) | |
1651 | attre->aggregator_as = stream_getl (peer->ibuf); | |
1652 | else | |
1653 | attre->aggregator_as = stream_getw (peer->ibuf); | |
fb982c25 | 1654 | attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf); |
718e3744 | 1655 | |
1656 | /* Set atomic aggregate flag. */ | |
1657 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR); | |
1658 | ||
b881c707 | 1659 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1660 | } |
1661 | ||
0b2aa3a0 | 1662 | /* New Aggregator attribute */ |
b881c707 | 1663 | static bgp_attr_parse_ret_t |
835315bf PJ |
1664 | bgp_attr_as4_aggregator (struct bgp_attr_parser_args *args, |
1665 | as_t *as4_aggregator_as, | |
1666 | struct in_addr *as4_aggregator_addr) | |
0b2aa3a0 | 1667 | { |
835315bf PJ |
1668 | struct peer *const peer = args->peer; |
1669 | struct attr *const attr = args->attr; | |
1670 | const bgp_size_t length = args->length; | |
1671 | ||
0b2aa3a0 PJ |
1672 | if (length != 8) |
1673 | { | |
16286195 | 1674 | zlog_err ("New Aggregator length is not 8 [%d]", length); |
835315bf | 1675 | return bgp_attr_malformed (args, |
b881c707 | 1676 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1677 | 0); |
0b2aa3a0 | 1678 | } |
3ecab4c8 | 1679 | |
0b2aa3a0 PJ |
1680 | *as4_aggregator_as = stream_getl (peer->ibuf); |
1681 | as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf); | |
1682 | ||
1683 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR); | |
1684 | ||
b881c707 | 1685 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1686 | } |
1687 | ||
1688 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1689 | */ | |
b881c707 | 1690 | static bgp_attr_parse_ret_t |
835315bf PJ |
1691 | bgp_attr_munge_as4_attrs (struct peer *const peer, |
1692 | struct attr *const attr, | |
0b2aa3a0 PJ |
1693 | struct aspath *as4_path, as_t as4_aggregator, |
1694 | struct in_addr *as4_aggregator_addr) | |
1695 | { | |
1696 | int ignore_as4_path = 0; | |
1697 | struct aspath *newpath; | |
1698 | struct attr_extra *attre = attr->extra; | |
bb7bef14 PJ |
1699 | |
1700 | if (!attr->aspath) | |
1701 | { | |
1702 | /* NULL aspath shouldn't be possible as bgp_attr_parse should have | |
1703 | * checked that all well-known, mandatory attributes were present. | |
1704 | * | |
1705 | * Can only be a problem with peer itself - hard error | |
1706 | */ | |
1707 | return BGP_ATTR_PARSE_ERROR; | |
1708 | } | |
1709 | ||
b881c707 | 1710 | if (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) |
0b2aa3a0 PJ |
1711 | { |
1712 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1713 | * if given. | |
1714 | * It is worth a warning though, because the peer really | |
1715 | * should not send them | |
1716 | */ | |
1717 | if (BGP_DEBUG(as4, AS4)) | |
1718 | { | |
1719 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1720 | zlog_debug ("[AS4] %s %s AS4_PATH", | |
1721 | peer->host, "AS4 capable peer, yet it sent"); | |
1722 | ||
1723 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1724 | zlog_debug ("[AS4] %s %s AS4_AGGREGATOR", | |
1725 | peer->host, "AS4 capable peer, yet it sent"); | |
1726 | } | |
1727 | ||
b881c707 | 1728 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1729 | } |
1730 | ||
0b2aa3a0 PJ |
1731 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR |
1732 | * because that may override AS4_PATH | |
1733 | */ | |
1734 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) ) | |
1735 | { | |
b881c707 | 1736 | if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) ) |
0b2aa3a0 | 1737 | { |
370b64a2 PJ |
1738 | assert (attre); |
1739 | ||
0b2aa3a0 PJ |
1740 | /* received both. |
1741 | * if the as_number in aggregator is not AS_TRANS, | |
1742 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1743 | * and the Aggregator shall be taken as | |
1744 | * info on the aggregating node, and the AS_PATH | |
1745 | * shall be taken as the AS_PATH | |
1746 | * otherwise | |
1747 | * the Aggregator shall be ignored and the | |
1748 | * AS4_AGGREGATOR shall be taken as the | |
1749 | * Aggregating node and the AS_PATH is to be | |
1750 | * constructed "as in all other cases" | |
1751 | */ | |
b881c707 | 1752 | if (attre->aggregator_as != BGP_AS_TRANS) |
0b2aa3a0 PJ |
1753 | { |
1754 | /* ignore */ | |
1755 | if ( BGP_DEBUG(as4, AS4)) | |
1756 | zlog_debug ("[AS4] %s BGP not AS4 capable peer" | |
1757 | " send AGGREGATOR != AS_TRANS and" | |
1758 | " AS4_AGGREGATOR, so ignore" | |
1759 | " AS4_AGGREGATOR and AS4_PATH", peer->host); | |
1760 | ignore_as4_path = 1; | |
1761 | } | |
1762 | else | |
1763 | { | |
1764 | /* "New_aggregator shall be taken as aggregator" */ | |
1765 | attre->aggregator_as = as4_aggregator; | |
1766 | attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr; | |
1767 | } | |
1768 | } | |
1769 | else | |
1770 | { | |
1771 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1772 | * That is bogus - but reading the conditions | |
1773 | * we have to handle AS4_AGGREGATOR as if it were | |
1774 | * AGGREGATOR in that case | |
1775 | */ | |
1776 | if ( BGP_DEBUG(as4, AS4)) | |
1777 | zlog_debug ("[AS4] %s BGP not AS4 capable peer send" | |
1778 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1779 | " it as if AGGREGATOR with AS_TRANS had been there", peer->host); | |
370b64a2 | 1780 | (attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator; |
0b2aa3a0 PJ |
1781 | /* sweep it under the carpet and simulate a "good" AGGREGATOR */ |
1782 | attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)); | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
b881c707 | 1787 | if (!ignore_as4_path && (attr->flag & (ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH)))) |
0b2aa3a0 | 1788 | { |
bb7bef14 PJ |
1789 | newpath = aspath_reconcile_as4 (attr->aspath, as4_path); |
1790 | aspath_unintern (&attr->aspath); | |
1791 | attr->aspath = aspath_intern (newpath); | |
0b2aa3a0 | 1792 | } |
b881c707 | 1793 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1794 | } |
1795 | ||
718e3744 | 1796 | /* Community attribute. */ |
b881c707 | 1797 | static bgp_attr_parse_ret_t |
835315bf | 1798 | bgp_attr_community (struct bgp_attr_parser_args *args) |
718e3744 | 1799 | { |
835315bf PJ |
1800 | struct peer *const peer = args->peer; |
1801 | struct attr *const attr = args->attr; | |
1802 | const bgp_size_t length = args->length; | |
b881c707 | 1803 | |
718e3744 | 1804 | if (length == 0) |
b2ceea18 PJ |
1805 | { |
1806 | attr->community = NULL; | |
b881c707 | 1807 | return BGP_ATTR_PARSE_PROCEED; |
b2ceea18 | 1808 | } |
0c466381 PJ |
1809 | |
1810 | attr->community = | |
1811 | community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length); | |
1812 | ||
1813 | /* XXX: fix community_parse to use stream API and remove this */ | |
1814 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1815 | |
0c466381 | 1816 | if (!attr->community) |
835315bf | 1817 | return bgp_attr_malformed (args, |
b881c707 | 1818 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
835315bf | 1819 | args->total); |
0c466381 | 1820 | |
718e3744 | 1821 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES); |
1822 | ||
b881c707 | 1823 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1824 | } |
1825 | ||
1826 | /* Originator ID attribute. */ | |
b881c707 | 1827 | static bgp_attr_parse_ret_t |
835315bf | 1828 | bgp_attr_originator_id (struct bgp_attr_parser_args *args) |
718e3744 | 1829 | { |
835315bf PJ |
1830 | struct peer *const peer = args->peer; |
1831 | struct attr *const attr = args->attr; | |
1832 | const bgp_size_t length = args->length; | |
1833 | ||
d595b566 | 1834 | /* Length check. */ |
718e3744 | 1835 | if (length != 4) |
1836 | { | |
16286195 | 1837 | zlog_err ("Bad originator ID length %d", length); |
718e3744 | 1838 | |
835315bf | 1839 | return bgp_attr_malformed (args, |
b881c707 | 1840 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
835315bf | 1841 | args->total); |
718e3744 | 1842 | } |
1843 | ||
fb982c25 PJ |
1844 | (bgp_attr_extra_get (attr))->originator_id.s_addr |
1845 | = stream_get_ipv4 (peer->ibuf); | |
718e3744 | 1846 | |
1847 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID); | |
1848 | ||
b881c707 | 1849 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1850 | } |
1851 | ||
1852 | /* Cluster list attribute. */ | |
b881c707 | 1853 | static bgp_attr_parse_ret_t |
835315bf | 1854 | bgp_attr_cluster_list (struct bgp_attr_parser_args *args) |
718e3744 | 1855 | { |
835315bf PJ |
1856 | struct peer *const peer = args->peer; |
1857 | struct attr *const attr = args->attr; | |
1858 | const bgp_size_t length = args->length; | |
1859 | ||
718e3744 | 1860 | /* Check length. */ |
1861 | if (length % 4) | |
1862 | { | |
16286195 | 1863 | zlog_err ("Bad cluster list length %d", length); |
718e3744 | 1864 | |
835315bf PJ |
1865 | return bgp_attr_malformed (args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1866 | args->total); | |
718e3744 | 1867 | } |
1868 | ||
fb982c25 PJ |
1869 | (bgp_attr_extra_get (attr))->cluster |
1870 | = cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length); | |
b881c707 PJ |
1871 | |
1872 | /* XXX: Fix cluster_parse to use stream API and then remove this */ | |
1873 | stream_forward_getp (peer->ibuf, length); | |
718e3744 | 1874 | |
1875 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST); | |
1876 | ||
b881c707 | 1877 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1878 | } |
1879 | ||
1880 | /* Multiprotocol reachability information parse. */ | |
03292809 | 1881 | int |
835315bf PJ |
1882 | bgp_mp_reach_parse (struct bgp_attr_parser_args *args, |
1883 | struct bgp_nlri *mp_update) | |
718e3744 | 1884 | { |
b58ed1f8 DS |
1885 | iana_afi_t pkt_afi; |
1886 | afi_t afi; | |
9cabb64b | 1887 | safi_t pkt_safi, safi; |
718e3744 | 1888 | bgp_size_t nlri_len; |
6e4ab12f | 1889 | size_t start; |
718e3744 | 1890 | struct stream *s; |
835315bf PJ |
1891 | struct peer *const peer = args->peer; |
1892 | struct attr *const attr = args->attr; | |
1893 | const bgp_size_t length = args->length; | |
fb982c25 | 1894 | struct attr_extra *attre = bgp_attr_extra_get(attr); |
835315bf | 1895 | |
718e3744 | 1896 | /* Set end of packet. */ |
6e4ab12f PJ |
1897 | s = BGP_INPUT(peer); |
1898 | start = stream_get_getp(s); | |
1899 | ||
1900 | /* safe to read statically sized header? */ | |
1901 | #define BGP_MP_REACH_MIN_SIZE 5 | |
03292809 | 1902 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
6e4ab12f | 1903 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) |
03292809 PJ |
1904 | { |
1905 | zlog_info ("%s: %s sent invalid length, %lu", | |
1906 | __func__, peer->host, (unsigned long)length); | |
f57000c0 | 1907 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1908 | } |
6e4ab12f | 1909 | |
718e3744 | 1910 | /* Load AFI, SAFI. */ |
9cabb64b | 1911 | pkt_afi = stream_getw (s); |
1912 | pkt_safi = stream_getc (s); | |
1913 | ||
1914 | /* Convert AFI, SAFI to internal values, check. */ | |
1915 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
1916 | { | |
1917 | /* Log if AFI or SAFI is unrecognized. This is not an error unless | |
1918 | * the attribute is otherwise malformed. | |
1919 | */ | |
1920 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1921 | zlog_debug ("%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1922 | peer->host, pkt_afi, pkt_safi); | |
1923 | return BGP_ATTR_PARSE_ERROR; | |
1924 | } | |
718e3744 | 1925 | |
1926 | /* Get nexthop length. */ | |
fb982c25 | 1927 | attre->mp_nexthop_len = stream_getc (s); |
6e4ab12f | 1928 | |
03292809 PJ |
1929 | if (LEN_LEFT < attre->mp_nexthop_len) |
1930 | { | |
1931 | zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1932 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1933 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 1934 | } |
6e4ab12f | 1935 | |
718e3744 | 1936 | /* Nexthop length check. */ |
fb982c25 | 1937 | switch (attre->mp_nexthop_len) |
718e3744 | 1938 | { |
801a9bcc DS |
1939 | case BGP_ATTR_NHLEN_IPV4: |
1940 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
66bed4f4 ML |
1941 | /* Probably needed for RFC 2283 */ |
1942 | if (attr->nexthop.s_addr == 0) | |
801a9bcc | 1943 | memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, IPV4_MAX_BYTELEN); |
718e3744 | 1944 | break; |
801a9bcc | 1945 | case BGP_ATTR_NHLEN_VPNV4: |
9206f9ec SH |
1946 | stream_getl (s); /* RD high */ |
1947 | stream_getl (s); /* RD low */ | |
801a9bcc | 1948 | stream_get (&attre->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); |
718e3744 | 1949 | break; |
801a9bcc | 1950 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
945c8fe9 LB |
1951 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: |
1952 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) | |
1953 | { | |
1954 | stream_getl (s); /* RD high */ | |
1955 | stream_getl (s); /* RD low */ | |
1956 | } | |
801a9bcc | 1957 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
718e3744 | 1958 | break; |
801a9bcc | 1959 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: |
945c8fe9 LB |
1960 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: |
1961 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
1962 | { | |
1963 | stream_getl (s); /* RD high */ | |
1964 | stream_getl (s); /* RD low */ | |
1965 | } | |
801a9bcc | 1966 | stream_get (&attre->mp_nexthop_global, s, IPV6_MAX_BYTELEN); |
945c8fe9 LB |
1967 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) |
1968 | { | |
1969 | stream_getl (s); /* RD high */ | |
1970 | stream_getl (s); /* RD low */ | |
1971 | } | |
801a9bcc | 1972 | stream_get (&attre->mp_nexthop_local, s, IPV6_MAX_BYTELEN); |
fb982c25 | 1973 | if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local)) |
718e3744 | 1974 | { |
1975 | char buf1[INET6_ADDRSTRLEN]; | |
1976 | char buf2[INET6_ADDRSTRLEN]; | |
1977 | ||
3f9c7369 | 1978 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3dd32081 DS |
1979 | zlog_debug ("%s rcvd nexthops %s, %s -- ignoring non-LL value", |
1980 | peer->host, | |
fb982c25 | 1981 | inet_ntop (AF_INET6, &attre->mp_nexthop_global, |
718e3744 | 1982 | buf1, INET6_ADDRSTRLEN), |
fb982c25 | 1983 | inet_ntop (AF_INET6, &attre->mp_nexthop_local, |
718e3744 | 1984 | buf2, INET6_ADDRSTRLEN)); |
1985 | ||
801a9bcc | 1986 | attre->mp_nexthop_len = IPV6_MAX_BYTELEN; |
718e3744 | 1987 | } |
1988 | break; | |
718e3744 | 1989 | default: |
03292809 PJ |
1990 | zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d", |
1991 | __func__, peer->host, attre->mp_nexthop_len); | |
f57000c0 | 1992 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
718e3744 | 1993 | } |
1994 | ||
03292809 PJ |
1995 | if (!LEN_LEFT) |
1996 | { | |
1997 | zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)", | |
1998 | __func__, peer->host); | |
f57000c0 | 1999 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 2000 | } |
718e3744 | 2001 | |
6e4ab12f PJ |
2002 | { |
2003 | u_char val; | |
2004 | if ((val = stream_getc (s))) | |
2005 | zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field", | |
2006 | peer->host, val); | |
2007 | } | |
2008 | ||
2009 | /* must have nrli_len, what is left of the attribute */ | |
03292809 | 2010 | nlri_len = LEN_LEFT; |
6e4ab12f | 2011 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) |
03292809 PJ |
2012 | { |
2013 | zlog_info ("%s: (%s) Failed to read NLRI", | |
2014 | __func__, peer->host); | |
f57000c0 | 2015 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
03292809 | 2016 | } |
718e3744 | 2017 | |
2018 | mp_update->afi = afi; | |
2019 | mp_update->safi = safi; | |
2020 | mp_update->nlri = stream_pnt (s); | |
2021 | mp_update->length = nlri_len; | |
2022 | ||
9985f83c | 2023 | stream_forward_getp (s, nlri_len); |
718e3744 | 2024 | |
37da8fa9 DL |
2025 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI); |
2026 | ||
b881c707 | 2027 | return BGP_ATTR_PARSE_PROCEED; |
03292809 | 2028 | #undef LEN_LEFT |
718e3744 | 2029 | } |
2030 | ||
2031 | /* Multiprotocol unreachable parse */ | |
03292809 | 2032 | int |
835315bf | 2033 | bgp_mp_unreach_parse (struct bgp_attr_parser_args *args, |
718e3744 | 2034 | struct bgp_nlri *mp_withdraw) |
2035 | { | |
2036 | struct stream *s; | |
b58ed1f8 | 2037 | iana_afi_t pkt_afi; |
4c9641ba | 2038 | afi_t afi; |
9cabb64b | 2039 | safi_t pkt_safi, safi; |
718e3744 | 2040 | u_int16_t withdraw_len; |
835315bf | 2041 | struct peer *const peer = args->peer; |
37da8fa9 | 2042 | struct attr *const attr = args->attr; |
835315bf | 2043 | const bgp_size_t length = args->length; |
718e3744 | 2044 | |
2045 | s = peer->ibuf; | |
6e4ab12f PJ |
2046 | |
2047 | #define BGP_MP_UNREACH_MIN_SIZE 3 | |
2048 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
f57000c0 | 2049 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
6e4ab12f | 2050 | |
9cabb64b | 2051 | pkt_afi = stream_getw (s); |
2052 | pkt_safi = stream_getc (s); | |
2053 | ||
2054 | /* Convert AFI, SAFI to internal values, check. */ | |
2055 | if (bgp_map_afi_safi_iana2int (pkt_afi, pkt_safi, &afi, &safi)) | |
2056 | { | |
2057 | /* Log if AFI or SAFI is unrecognized. This is not an error unless | |
2058 | * the attribute is otherwise malformed. | |
2059 | */ | |
2060 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2061 | zlog_debug ("%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
2062 | peer->host, pkt_afi, pkt_safi); | |
2063 | return BGP_ATTR_PARSE_ERROR; | |
2064 | } | |
2065 | ||
6e4ab12f | 2066 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2067 | |
718e3744 | 2068 | mp_withdraw->afi = afi; |
2069 | mp_withdraw->safi = safi; | |
2070 | mp_withdraw->nlri = stream_pnt (s); | |
2071 | mp_withdraw->length = withdraw_len; | |
2072 | ||
9985f83c | 2073 | stream_forward_getp (s, withdraw_len); |
718e3744 | 2074 | |
37da8fa9 DL |
2075 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI); |
2076 | ||
b881c707 | 2077 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2078 | } |
2079 | ||
57d187bc JS |
2080 | /* Large Community attribute. */ |
2081 | static bgp_attr_parse_ret_t | |
2082 | bgp_attr_large_community (struct bgp_attr_parser_args *args) | |
2083 | { | |
2084 | struct peer *const peer = args->peer; | |
2085 | struct attr *const attr = args->attr; | |
2086 | const bgp_size_t length = args->length; | |
2087 | ||
2088 | /* | |
2089 | * Large community follows new attribute format. | |
2090 | */ | |
2091 | if (length == 0) | |
2092 | { | |
2093 | if (attr->extra) | |
2094 | attr->extra->lcommunity = NULL; | |
2095 | /* Empty extcomm doesn't seem to be invalid per se */ | |
2096 | return BGP_ATTR_PARSE_PROCEED; | |
2097 | } | |
2098 | ||
2099 | (bgp_attr_extra_get (attr))->lcommunity = | |
2100 | lcommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
2101 | /* XXX: fix ecommunity_parse to use stream API */ | |
2102 | stream_forward_getp (peer->ibuf, length); | |
2103 | ||
2104 | if (attr->extra && !attr->extra->lcommunity) | |
2105 | return bgp_attr_malformed (args, | |
2106 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2107 | args->total); | |
2108 | ||
2109 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES); | |
2110 | ||
2111 | return BGP_ATTR_PARSE_PROCEED; | |
2112 | } | |
2113 | ||
718e3744 | 2114 | /* Extended Community attribute. */ |
b881c707 | 2115 | static bgp_attr_parse_ret_t |
835315bf | 2116 | bgp_attr_ext_communities (struct bgp_attr_parser_args *args) |
718e3744 | 2117 | { |
835315bf PJ |
2118 | struct peer *const peer = args->peer; |
2119 | struct attr *const attr = args->attr; | |
2120 | const bgp_size_t length = args->length; | |
b881c707 | 2121 | |
718e3744 | 2122 | if (length == 0) |
fb982c25 PJ |
2123 | { |
2124 | if (attr->extra) | |
2125 | attr->extra->ecommunity = NULL; | |
0c466381 | 2126 | /* Empty extcomm doesn't seem to be invalid per se */ |
b881c707 | 2127 | return BGP_ATTR_PARSE_PROCEED; |
fb982c25 | 2128 | } |
0c466381 PJ |
2129 | |
2130 | (bgp_attr_extra_get (attr))->ecommunity = | |
2131 | ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length); | |
2132 | /* XXX: fix ecommunity_parse to use stream API */ | |
2133 | stream_forward_getp (peer->ibuf, length); | |
2134 | ||
57d187bc | 2135 | if (attr->extra && !attr->extra->ecommunity) |
835315bf PJ |
2136 | return bgp_attr_malformed (args, |
2137 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2138 | args->total); | |
0c466381 | 2139 | |
718e3744 | 2140 | attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES); |
2141 | ||
b881c707 | 2142 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2143 | } |
2144 | ||
f4c89855 LB |
2145 | /* Parse Tunnel Encap attribute in an UPDATE */ |
2146 | static int | |
2147 | bgp_attr_encap( | |
2148 | uint8_t type, | |
2149 | struct peer *peer, /* IN */ | |
2150 | bgp_size_t length, /* IN: attr's length field */ | |
2151 | struct attr *attr, /* IN: caller already allocated */ | |
2152 | u_char flag, /* IN: attr's flags field */ | |
2153 | u_char *startp) | |
2154 | { | |
2155 | bgp_size_t total; | |
2156 | struct attr_extra *attre = NULL; | |
2157 | struct bgp_attr_encap_subtlv *stlv_last = NULL; | |
2de1475f | 2158 | uint16_t tunneltype = 0; |
f4c89855 LB |
2159 | |
2160 | total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2161 | ||
2162 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2163 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) | |
2164 | { | |
2165 | zlog_info ("Tunnel Encap attribute flag isn't optional and transitive %d", flag); | |
2166 | bgp_notify_send_with_data (peer, | |
2167 | BGP_NOTIFY_UPDATE_ERR, | |
2168 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2169 | startp, total); | |
2170 | return -1; | |
2171 | } | |
2172 | ||
2173 | if (BGP_ATTR_ENCAP == type) { | |
2174 | /* read outer TLV type and length */ | |
2175 | uint16_t tlv_length; | |
2176 | ||
2177 | if (length < 4) { | |
2178 | zlog_info ("Tunnel Encap attribute not long enough to contain outer T,L"); | |
2179 | bgp_notify_send_with_data(peer, | |
2180 | BGP_NOTIFY_UPDATE_ERR, | |
2181 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2182 | startp, total); | |
2183 | return -1; | |
2184 | } | |
2185 | tunneltype = stream_getw (BGP_INPUT (peer)); | |
2186 | tlv_length = stream_getw (BGP_INPUT (peer)); | |
2187 | length -= 4; | |
2188 | ||
2189 | if (tlv_length != length) { | |
2190 | zlog_info ("%s: tlv_length(%d) != length(%d)", | |
2191 | __func__, tlv_length, length); | |
2192 | } | |
2193 | } | |
2194 | ||
2195 | while (length >= 4) { | |
0f2b4f4d | 2196 | uint16_t subtype = 0; |
f4cafc65 | 2197 | uint16_t sublength = 0; |
f4c89855 LB |
2198 | struct bgp_attr_encap_subtlv *tlv; |
2199 | ||
587ff0fd LB |
2200 | if (BGP_ATTR_ENCAP == type) { |
2201 | subtype = stream_getc (BGP_INPUT (peer)); | |
2202 | sublength = stream_getc (BGP_INPUT (peer)); | |
2203 | length -= 2; | |
65efcfce LB |
2204 | #if ENABLE_BGP_VNC |
2205 | } else { | |
2206 | subtype = stream_getw (BGP_INPUT (peer)); | |
2207 | sublength = stream_getw (BGP_INPUT (peer)); | |
2208 | length -= 4; | |
2209 | #endif | |
587ff0fd | 2210 | } |
f4c89855 LB |
2211 | |
2212 | if (sublength > length) { | |
2213 | zlog_info ("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2214 | sublength, length); | |
2215 | bgp_notify_send_with_data (peer, | |
2216 | BGP_NOTIFY_UPDATE_ERR, | |
2217 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2218 | startp, total); | |
2219 | return -1; | |
2220 | } | |
2221 | ||
2222 | /* alloc and copy sub-tlv */ | |
2223 | /* TBD make sure these are freed when attributes are released */ | |
2224 | tlv = XCALLOC (MTYPE_ENCAP_TLV, sizeof(struct bgp_attr_encap_subtlv)-1+sublength); | |
2225 | tlv->type = subtype; | |
2226 | tlv->length = sublength; | |
2227 | stream_get(tlv->value, peer->ibuf, sublength); | |
2228 | length -= sublength; | |
2229 | ||
2230 | /* attach tlv to encap chain */ | |
2231 | if (!attre) { | |
2232 | attre = bgp_attr_extra_get(attr); | |
2233 | if (BGP_ATTR_ENCAP == type) { | |
2234 | for (stlv_last = attre->encap_subtlvs; stlv_last && stlv_last->next; | |
2235 | stlv_last = stlv_last->next); | |
2236 | if (stlv_last) { | |
2237 | stlv_last->next = tlv; | |
2238 | } else { | |
2239 | attre->encap_subtlvs = tlv; | |
2240 | } | |
65efcfce LB |
2241 | #if ENABLE_BGP_VNC |
2242 | } else { | |
2243 | for (stlv_last = attre->vnc_subtlvs; stlv_last && stlv_last->next; | |
2244 | stlv_last = stlv_last->next); | |
2245 | if (stlv_last) { | |
2246 | stlv_last->next = tlv; | |
2247 | } else { | |
2248 | attre->vnc_subtlvs = tlv; | |
2249 | } | |
2250 | #endif | |
f4c89855 LB |
2251 | } |
2252 | } else { | |
2253 | stlv_last->next = tlv; | |
2254 | } | |
2255 | stlv_last = tlv; | |
2256 | } | |
2257 | ||
ac73d8fb LB |
2258 | if (BGP_ATTR_ENCAP == type) { |
2259 | if (!attre) | |
2260 | attre = bgp_attr_extra_get(attr); | |
2261 | attre->encap_tunneltype = tunneltype; | |
f4c89855 LB |
2262 | } |
2263 | ||
2264 | if (length) { | |
2265 | /* spurious leftover data */ | |
2266 | zlog_info ("Tunnel Encap attribute length is bad: %d leftover octets", length); | |
2267 | bgp_notify_send_with_data (peer, | |
2268 | BGP_NOTIFY_UPDATE_ERR, | |
2269 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2270 | startp, total); | |
2271 | return -1; | |
2272 | } | |
2273 | ||
2274 | return 0; | |
2275 | } | |
2276 | ||
718e3744 | 2277 | /* BGP unknown attribute treatment. */ |
b881c707 | 2278 | static bgp_attr_parse_ret_t |
835315bf | 2279 | bgp_attr_unknown (struct bgp_attr_parser_args *args) |
718e3744 | 2280 | { |
8794e8d2 | 2281 | bgp_size_t total = args->total; |
718e3744 | 2282 | struct transit *transit; |
fb982c25 | 2283 | struct attr_extra *attre; |
835315bf PJ |
2284 | struct peer *const peer = args->peer; |
2285 | struct attr *const attr = args->attr; | |
2286 | u_char *const startp = args->startp; | |
2287 | const u_char type = args->type; | |
2288 | const u_char flag = args->flags; | |
2289 | const bgp_size_t length = args->length; | |
2290 | ||
3f9c7369 | 2291 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
16286195 DS |
2292 | zlog_debug ("%s Unknown attribute is received (type %d, length %d)", |
2293 | peer->host, type, length); | |
f418446b | 2294 | |
718e3744 | 2295 | /* Forward read pointer of input stream. */ |
9985f83c | 2296 | stream_forward_getp (peer->ibuf, length); |
718e3744 | 2297 | |
718e3744 | 2298 | /* If any of the mandatory well-known attributes are not recognized, |
2299 | then the Error Subcode is set to Unrecognized Well-known | |
2300 | Attribute. The Data field contains the unrecognized attribute | |
2301 | (type, length and value). */ | |
b881c707 | 2302 | if (!CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)) |
718e3744 | 2303 | { |
835315bf | 2304 | return bgp_attr_malformed (args, |
b881c707 | 2305 | BGP_NOTIFY_UPDATE_UNREC_ATTR, |
835315bf | 2306 | args->total); |
718e3744 | 2307 | } |
2308 | ||
2309 | /* Unrecognized non-transitive optional attributes must be quietly | |
2310 | ignored and not passed along to other BGP peers. */ | |
2311 | if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS)) | |
b881c707 | 2312 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2313 | |
2314 | /* If a path with recognized transitive optional attribute is | |
2315 | accepted and passed along to other BGP peers and the Partial bit | |
2316 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2317 | is not set back to 0 by the current AS. */ | |
2318 | SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL); | |
2319 | ||
2320 | /* Store transitive attribute to the end of attr->transit. */ | |
fb982c25 | 2321 | if (! ((attre = bgp_attr_extra_get(attr))->transit) ) |
393deb9b | 2322 | attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit)); |
718e3744 | 2323 | |
fb982c25 | 2324 | transit = attre->transit; |
718e3744 | 2325 | |
2326 | if (transit->val) | |
2327 | transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val, | |
2328 | transit->length + total); | |
2329 | else | |
2330 | transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total); | |
2331 | ||
2332 | memcpy (transit->val + transit->length, startp, total); | |
2333 | transit->length += total; | |
2334 | ||
b881c707 | 2335 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2336 | } |
2337 | ||
bb7bef14 PJ |
2338 | /* Well-known attribute check. */ |
2339 | static int | |
52a51fd3 | 2340 | bgp_attr_check (struct peer *peer, struct attr *attr) |
bb7bef14 PJ |
2341 | { |
2342 | u_char type = 0; | |
2343 | ||
67495ddb PJ |
2344 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an |
2345 | * empty UPDATE. */ | |
2346 | if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2347 | return BGP_ATTR_PARSE_PROCEED; | |
2348 | ||
2349 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2350 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2351 | are present, it should. Check for any other attribute being present | |
2352 | instead. | |
2353 | */ | |
2354 | if (attr->flag == ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI)) | |
2355 | return BGP_ATTR_PARSE_PROCEED; | |
2356 | ||
bb7bef14 PJ |
2357 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN))) |
2358 | type = BGP_ATTR_ORIGIN; | |
2359 | ||
2360 | if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))) | |
2361 | type = BGP_ATTR_AS_PATH; | |
2362 | ||
52a51fd3 DW |
2363 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present and |
2364 | * NLRI is empty. We can't easily check NLRI empty here though. | |
bb7bef14 | 2365 | */ |
52a51fd3 DW |
2366 | if (!CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
2367 | && !CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_MP_REACH_NLRI))) | |
2368 | type = BGP_ATTR_NEXT_HOP; | |
bb7bef14 PJ |
2369 | |
2370 | if (peer->sort == BGP_PEER_IBGP | |
2371 | && ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))) | |
2372 | type = BGP_ATTR_LOCAL_PREF; | |
2373 | ||
2374 | if (type) | |
2375 | { | |
52a51fd3 DW |
2376 | zlog_warn ("%s Missing well-known attribute %s.", peer->host, |
2377 | LOOKUP (attr_str, type)); | |
bb7bef14 PJ |
2378 | bgp_notify_send_with_data (peer, |
2379 | BGP_NOTIFY_UPDATE_ERR, | |
2380 | BGP_NOTIFY_UPDATE_MISS_ATTR, | |
2381 | &type, 1); | |
2382 | return BGP_ATTR_PARSE_ERROR; | |
2383 | } | |
2384 | return BGP_ATTR_PARSE_PROCEED; | |
2385 | } | |
2386 | ||
718e3744 | 2387 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2388 | bgp_update_receive() in bgp_packet.c. */ |
b881c707 | 2389 | bgp_attr_parse_ret_t |
718e3744 | 2390 | bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size, |
52a51fd3 | 2391 | struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw) |
718e3744 | 2392 | { |
2393 | int ret; | |
b881c707 | 2394 | u_char flag = 0; |
0b2aa3a0 | 2395 | u_char type = 0; |
718e3744 | 2396 | bgp_size_t length; |
2397 | u_char *startp, *endp; | |
2398 | u_char *attr_endp; | |
2399 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
0b2aa3a0 PJ |
2400 | /* we need the as4_path only until we have synthesized the as_path with it */ |
2401 | /* same goes for as4_aggregator */ | |
2402 | struct aspath *as4_path = NULL; | |
2403 | as_t as4_aggregator = 0; | |
19c3598b | 2404 | struct in_addr as4_aggregator_addr = { .s_addr = 0 }; |
718e3744 | 2405 | |
2406 | /* Initialize bitmap. */ | |
2407 | memset (seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2408 | ||
2409 | /* End pointer of BGP attribute. */ | |
2410 | endp = BGP_INPUT_PNT (peer) + size; | |
b881c707 | 2411 | |
718e3744 | 2412 | /* Get attributes to the end of attribute length. */ |
2413 | while (BGP_INPUT_PNT (peer) < endp) | |
2414 | { | |
2415 | /* Check remaining length check.*/ | |
2416 | if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN) | |
2417 | { | |
c29fdba7 | 2418 | /* XXX warning: long int format, int arg (arg 5) */ |
16286195 DS |
2419 | zlog_warn ("%s: error BGP attribute length %lu is smaller than min len", |
2420 | peer->host, | |
2421 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
718e3744 | 2422 | |
2423 | bgp_notify_send (peer, | |
2424 | BGP_NOTIFY_UPDATE_ERR, | |
2425 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2426 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2427 | } |
2428 | ||
2429 | /* Fetch attribute flag and type. */ | |
2430 | startp = BGP_INPUT_PNT (peer); | |
2d42e68a DO |
2431 | /* "The lower-order four bits of the Attribute Flags octet are |
2432 | unused. They MUST be zero when sent and MUST be ignored when | |
2433 | received." */ | |
2434 | flag = 0xF0 & stream_getc (BGP_INPUT (peer)); | |
718e3744 | 2435 | type = stream_getc (BGP_INPUT (peer)); |
2436 | ||
370b64a2 PJ |
2437 | /* Check whether Extended-Length applies and is in bounds */ |
2438 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) | |
2439 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) | |
2440 | { | |
16286195 DS |
2441 | zlog_warn ("%s: Extended length set, but just %lu bytes of attr header", |
2442 | peer->host, | |
2443 | (unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer)))); | |
370b64a2 PJ |
2444 | |
2445 | bgp_notify_send (peer, | |
2446 | BGP_NOTIFY_UPDATE_ERR, | |
2447 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 | 2448 | return BGP_ATTR_PARSE_ERROR; |
370b64a2 | 2449 | } |
835315bf | 2450 | |
718e3744 | 2451 | /* Check extended attribue length bit. */ |
2452 | if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)) | |
2453 | length = stream_getw (BGP_INPUT (peer)); | |
2454 | else | |
2455 | length = stream_getc (BGP_INPUT (peer)); | |
2456 | ||
2457 | /* If any attribute appears more than once in the UPDATE | |
2458 | message, then the Error Subcode is set to Malformed Attribute | |
2459 | List. */ | |
2460 | ||
2461 | if (CHECK_BITMAP (seen, type)) | |
2462 | { | |
16286195 DS |
2463 | zlog_warn ("%s: error BGP attribute type %d appears twice in a message", |
2464 | peer->host, type); | |
718e3744 | 2465 | |
2466 | bgp_notify_send (peer, | |
2467 | BGP_NOTIFY_UPDATE_ERR, | |
2468 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 | 2469 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2470 | } |
2471 | ||
2472 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2473 | unsigned char so it never overflow bitmap range. */ | |
2474 | ||
2475 | SET_BITMAP (seen, type); | |
2476 | ||
2477 | /* Overflow check. */ | |
2478 | attr_endp = BGP_INPUT_PNT (peer) + length; | |
2479 | ||
2480 | if (attr_endp > endp) | |
2481 | { | |
16286195 | 2482 | 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 |
2483 | bgp_notify_send_with_data (peer, |
2484 | BGP_NOTIFY_UPDATE_ERR, | |
2485 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2486 | startp, attr_endp - startp); | |
b881c707 | 2487 | return BGP_ATTR_PARSE_ERROR; |
718e3744 | 2488 | } |
835315bf PJ |
2489 | |
2490 | struct bgp_attr_parser_args attr_args = { | |
2491 | .peer = peer, | |
2492 | .length = length, | |
2493 | .attr = attr, | |
2494 | .type = type, | |
2495 | .flags = flag, | |
2496 | .startp = startp, | |
2497 | .total = attr_endp - startp, | |
2498 | }; | |
2499 | ||
2500 | ||
2501 | /* If any recognized attribute has Attribute Flags that conflict | |
2502 | with the Attribute Type Code, then the Error Subcode is set to | |
2503 | Attribute Flags Error. The Data field contains the erroneous | |
2504 | attribute (type, length and value). */ | |
2505 | if (bgp_attr_flag_invalid (&attr_args)) | |
fa61e16d PJ |
2506 | { |
2507 | bgp_attr_parse_ret_t ret; | |
2508 | ret = bgp_attr_malformed (&attr_args, | |
2509 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2510 | attr_args.total); | |
2511 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2512 | continue; | |
2513 | return ret; | |
2514 | } | |
718e3744 | 2515 | |
2516 | /* OK check attribute and store it's value. */ | |
2517 | switch (type) | |
2518 | { | |
2519 | case BGP_ATTR_ORIGIN: | |
835315bf | 2520 | ret = bgp_attr_origin (&attr_args); |
718e3744 | 2521 | break; |
2522 | case BGP_ATTR_AS_PATH: | |
835315bf | 2523 | ret = bgp_attr_aspath (&attr_args); |
718e3744 | 2524 | break; |
0b2aa3a0 | 2525 | case BGP_ATTR_AS4_PATH: |
835315bf | 2526 | ret = bgp_attr_as4_path (&attr_args, &as4_path); |
0b2aa3a0 | 2527 | break; |
718e3744 | 2528 | case BGP_ATTR_NEXT_HOP: |
835315bf | 2529 | ret = bgp_attr_nexthop (&attr_args); |
718e3744 | 2530 | break; |
2531 | case BGP_ATTR_MULTI_EXIT_DISC: | |
835315bf | 2532 | ret = bgp_attr_med (&attr_args); |
718e3744 | 2533 | break; |
2534 | case BGP_ATTR_LOCAL_PREF: | |
835315bf | 2535 | ret = bgp_attr_local_pref (&attr_args); |
718e3744 | 2536 | break; |
2537 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
835315bf | 2538 | ret = bgp_attr_atomic (&attr_args); |
718e3744 | 2539 | break; |
2540 | case BGP_ATTR_AGGREGATOR: | |
835315bf | 2541 | ret = bgp_attr_aggregator (&attr_args); |
718e3744 | 2542 | break; |
0b2aa3a0 | 2543 | case BGP_ATTR_AS4_AGGREGATOR: |
835315bf PJ |
2544 | ret = bgp_attr_as4_aggregator (&attr_args, |
2545 | &as4_aggregator, | |
2546 | &as4_aggregator_addr); | |
0b2aa3a0 | 2547 | break; |
718e3744 | 2548 | case BGP_ATTR_COMMUNITIES: |
835315bf | 2549 | ret = bgp_attr_community (&attr_args); |
718e3744 | 2550 | break; |
57d187bc JS |
2551 | case BGP_ATTR_LARGE_COMMUNITIES: |
2552 | ret = bgp_attr_large_community (&attr_args); | |
2553 | break; | |
718e3744 | 2554 | case BGP_ATTR_ORIGINATOR_ID: |
835315bf | 2555 | ret = bgp_attr_originator_id (&attr_args); |
718e3744 | 2556 | break; |
2557 | case BGP_ATTR_CLUSTER_LIST: | |
835315bf | 2558 | ret = bgp_attr_cluster_list (&attr_args); |
718e3744 | 2559 | break; |
2560 | case BGP_ATTR_MP_REACH_NLRI: | |
835315bf | 2561 | ret = bgp_mp_reach_parse (&attr_args, mp_update); |
718e3744 | 2562 | break; |
2563 | case BGP_ATTR_MP_UNREACH_NLRI: | |
835315bf | 2564 | ret = bgp_mp_unreach_parse (&attr_args, mp_withdraw); |
718e3744 | 2565 | break; |
2566 | case BGP_ATTR_EXT_COMMUNITIES: | |
835315bf | 2567 | ret = bgp_attr_ext_communities (&attr_args); |
718e3744 | 2568 | break; |
65efcfce LB |
2569 | #if ENABLE_BGP_VNC |
2570 | case BGP_ATTR_VNC: | |
2571 | #endif | |
f4c89855 LB |
2572 | case BGP_ATTR_ENCAP: |
2573 | ret = bgp_attr_encap (type, peer, length, attr, flag, startp); | |
2574 | break; | |
718e3744 | 2575 | default: |
835315bf | 2576 | ret = bgp_attr_unknown (&attr_args); |
718e3744 | 2577 | break; |
2578 | } | |
b881c707 | 2579 | |
f57000c0 DL |
2580 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) |
2581 | { | |
2582 | bgp_notify_send (peer, | |
2583 | BGP_NOTIFY_UPDATE_ERR, | |
2584 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2585 | ret = BGP_ATTR_PARSE_ERROR; | |
2586 | } | |
2587 | ||
b881c707 PJ |
2588 | /* If hard error occured immediately return to the caller. */ |
2589 | if (ret == BGP_ATTR_PARSE_ERROR) | |
6e4ab12f | 2590 | { |
16286195 DS |
2591 | zlog_warn ("%s: Attribute %s, parse error", |
2592 | peer->host, | |
2593 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2594 | if (as4_path) |
2595 | aspath_unintern (&as4_path); | |
2596 | return ret; | |
6e4ab12f | 2597 | } |
b881c707 PJ |
2598 | if (ret == BGP_ATTR_PARSE_WITHDRAW) |
2599 | { | |
2600 | ||
16286195 DS |
2601 | zlog_warn ("%s: Attribute %s, parse error - treating as withdrawal", |
2602 | peer->host, | |
2603 | LOOKUP (attr_str, type)); | |
b881c707 PJ |
2604 | if (as4_path) |
2605 | aspath_unintern (&as4_path); | |
2606 | return ret; | |
2607 | } | |
2608 | ||
718e3744 | 2609 | /* Check the fetched length. */ |
2610 | if (BGP_INPUT_PNT (peer) != attr_endp) | |
2611 | { | |
16286195 DS |
2612 | zlog_warn ("%s: BGP attribute %s, fetch error", |
2613 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2614 | bgp_notify_send (peer, |
2615 | BGP_NOTIFY_UPDATE_ERR, | |
2616 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2617 | if (as4_path) |
2618 | aspath_unintern (&as4_path); | |
2619 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2620 | } |
2621 | } | |
2622 | ||
2623 | /* Check final read pointer is same as end pointer. */ | |
2624 | if (BGP_INPUT_PNT (peer) != endp) | |
2625 | { | |
16286195 DS |
2626 | zlog_warn ("%s: BGP attribute %s, length mismatch", |
2627 | peer->host, LOOKUP (attr_str, type)); | |
718e3744 | 2628 | bgp_notify_send (peer, |
2629 | BGP_NOTIFY_UPDATE_ERR, | |
2630 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b881c707 PJ |
2631 | if (as4_path) |
2632 | aspath_unintern (&as4_path); | |
2633 | return BGP_ATTR_PARSE_ERROR; | |
718e3744 | 2634 | } |
2635 | ||
bb7bef14 PJ |
2636 | /* Check all mandatory well-known attributes are present */ |
2637 | { | |
2638 | bgp_attr_parse_ret_t ret; | |
52a51fd3 | 2639 | if ((ret = bgp_attr_check (peer, attr)) < 0) |
bb7bef14 PJ |
2640 | { |
2641 | if (as4_path) | |
2642 | aspath_unintern (&as4_path); | |
2643 | return ret; | |
2644 | } | |
2645 | } | |
2646 | ||
0b2aa3a0 PJ |
2647 | /* |
2648 | * At this place we can see whether we got AS4_PATH and/or | |
2649 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2650 | * We can not do this before we've read all attributes because | |
2651 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2652 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2653 | * in relationship to AGGREGATOR. | |
2654 | * So, to be defensive, we are not relying on any order and read | |
2655 | * all attributes first, including these 32bit ones, and now, | |
2656 | * afterwards, we look what and if something is to be done for as4. | |
67495ddb PJ |
2657 | * |
2658 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2659 | * MP_UNREACH_NLRI. | |
0b2aa3a0 | 2660 | */ |
f57000c0 DL |
2661 | /* actually... this doesn't ever return failure currently, but |
2662 | * better safe than sorry */ | |
67495ddb PJ |
2663 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)) |
2664 | && bgp_attr_munge_as4_attrs (peer, attr, as4_path, | |
0b2aa3a0 | 2665 | as4_aggregator, &as4_aggregator_addr)) |
b881c707 | 2666 | { |
f57000c0 DL |
2667 | bgp_notify_send (peer, |
2668 | BGP_NOTIFY_UPDATE_ERR, | |
2669 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b881c707 PJ |
2670 | if (as4_path) |
2671 | aspath_unintern (&as4_path); | |
2672 | return BGP_ATTR_PARSE_ERROR; | |
2673 | } | |
0b2aa3a0 PJ |
2674 | |
2675 | /* At this stage, we have done all fiddling with as4, and the | |
2676 | * resulting info is in attr->aggregator resp. attr->aspath | |
2677 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2678 | * order to save memory | |
2679 | */ | |
b881c707 | 2680 | if (as4_path) |
0b2aa3a0 | 2681 | { |
f6f434b2 | 2682 | aspath_unintern (&as4_path); /* unintern - it is in the hash */ |
0b2aa3a0 PJ |
2683 | /* The flag that we got this is still there, but that does not |
2684 | * do any trouble | |
2685 | */ | |
2686 | } | |
2687 | /* | |
2688 | * The "rest" of the code does nothing with as4_aggregator. | |
2689 | * there is no memory attached specifically which is not part | |
2690 | * of the attr. | |
2691 | * so ignoring just means do nothing. | |
2692 | */ | |
2693 | /* | |
2694 | * Finally do the checks on the aspath we did not do yet | |
2695 | * because we waited for a potentially synthesized aspath. | |
2696 | */ | |
b881c707 | 2697 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) |
0b2aa3a0 | 2698 | { |
835315bf | 2699 | ret = bgp_attr_aspath_check (peer, attr); |
b881c707 | 2700 | if (ret != BGP_ATTR_PARSE_PROCEED) |
0b2aa3a0 PJ |
2701 | return ret; |
2702 | } | |
bede7744 LB |
2703 | if (attr->extra) |
2704 | { | |
2705 | /* Finally intern unknown attribute. */ | |
2706 | if (attr->extra->transit) | |
2707 | attr->extra->transit = transit_intern (attr->extra->transit); | |
2708 | if (attr->extra->encap_subtlvs) | |
2709 | attr->extra->encap_subtlvs = encap_intern (attr->extra->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
2710 | #if ENABLE_BGP_VNC | |
2711 | if (attr->extra->vnc_subtlvs) | |
2712 | attr->extra->vnc_subtlvs = encap_intern (attr->extra->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
2713 | #endif | |
2714 | } | |
718e3744 | 2715 | |
b881c707 | 2716 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2717 | } |
2718 | ||
8c71e481 | 2719 | size_t |
8a92a8a0 | 2720 | bgp_packet_mpattr_start (struct stream *s, afi_t afi, safi_t safi, afi_t nh_afi, |
3f9c7369 | 2721 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 PM |
2722 | struct attr *attr) |
2723 | { | |
2724 | size_t sizep; | |
b58ed1f8 | 2725 | iana_afi_t pkt_afi; |
9cabb64b | 2726 | safi_t pkt_safi; |
8c71e481 PM |
2727 | |
2728 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2729 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2730 | stream_putc (s, BGP_ATTR_MP_REACH_NLRI); | |
2731 | sizep = stream_get_endp (s); | |
2732 | stream_putw (s, 0); /* Marker: Attribute length. */ | |
93b73dfa | 2733 | |
9cabb64b | 2734 | |
2735 | /* Convert AFI, SAFI to values for packet. */ | |
2736 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
2737 | ||
2738 | stream_putw (s, pkt_afi); /* AFI */ | |
2739 | stream_putc (s, pkt_safi); /* SAFI */ | |
8c71e481 | 2740 | |
fe3ca08f LB |
2741 | if (nh_afi == AFI_MAX) |
2742 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->extra->mp_nexthop_len); | |
8c71e481 | 2743 | /* Nexthop */ |
8a92a8a0 | 2744 | switch (nh_afi) |
8c71e481 PM |
2745 | { |
2746 | case AFI_IP: | |
2747 | switch (safi) | |
2748 | { | |
6407da5a | 2749 | case SAFI_UNICAST: |
8c71e481 | 2750 | case SAFI_MULTICAST: |
3f9c7369 | 2751 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 PM |
2752 | stream_putc (s, 4); |
2753 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
2754 | break; | |
2755 | case SAFI_MPLS_VPN: | |
3f9c7369 | 2756 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 | 2757 | stream_putc (s, 12); |
93b73dfa | 2758 | stream_putl (s, 0); /* RD = 0, per RFC */ |
8c71e481 PM |
2759 | stream_putl (s, 0); |
2760 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2761 | break; | |
587ff0fd LB |
2762 | case SAFI_ENCAP: |
2763 | stream_putc (s, 4); | |
2764 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2765 | break; | |
8c71e481 PM |
2766 | default: |
2767 | break; | |
2768 | } | |
2769 | break; | |
8c71e481 PM |
2770 | case AFI_IP6: |
2771 | switch (safi) | |
2772 | { | |
2773 | case SAFI_UNICAST: | |
2774 | case SAFI_MULTICAST: | |
2775 | { | |
8c71e481 PM |
2776 | struct attr_extra *attre = attr->extra; |
2777 | ||
2778 | assert (attr->extra); | |
3f9c7369 | 2779 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); |
8c71e481 | 2780 | stream_putc (s, attre->mp_nexthop_len); |
801a9bcc DS |
2781 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2782 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
2783 | stream_put (s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
8c71e481 | 2784 | } |
93b73dfa LB |
2785 | break; |
2786 | case SAFI_MPLS_VPN: | |
2787 | { | |
2788 | struct attr_extra *attre = attr->extra; | |
2789 | ||
2790 | assert (attr->extra); | |
6407da5a | 2791 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL) { |
93b73dfa LB |
2792 | stream_putc (s, 24); |
2793 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2794 | stream_putl (s, 0); | |
6407da5a | 2795 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
2796 | } else if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
93b73dfa LB |
2797 | stream_putc (s, 48); |
2798 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2799 | stream_putl (s, 0); | |
6407da5a | 2800 | stream_put (s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2801 | stream_putl (s, 0); /* RD = 0, per RFC */ |
2802 | stream_putl (s, 0); | |
6407da5a | 2803 | stream_put (s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); |
93b73dfa LB |
2804 | } |
2805 | } | |
2806 | break; | |
587ff0fd LB |
2807 | case SAFI_ENCAP: |
2808 | assert (attr->extra); | |
2809 | stream_putc (s, IPV6_MAX_BYTELEN); | |
2810 | stream_put (s, &attr->extra->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
2811 | break; | |
8c71e481 PM |
2812 | default: |
2813 | break; | |
2814 | } | |
2815 | break; | |
e9cf8c8e PG |
2816 | case AFI_L2VPN: |
2817 | switch (safi) | |
2818 | { | |
2819 | case SAFI_EVPN: | |
2820 | if (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV4) | |
2821 | { | |
2822 | stream_putc (s, 12); | |
2823 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2824 | stream_putl (s, 0); | |
2825 | stream_put (s, &attr->extra->mp_nexthop_global_in, 4); | |
2826 | } | |
2827 | else if (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL) | |
2828 | { | |
2829 | stream_putc (s, 24); | |
2830 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2831 | stream_putl (s, 0); | |
2832 | stream_put (s, &attr->extra->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
2833 | } | |
2834 | else if (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
2835 | { | |
2836 | stream_putc (s, 48); | |
2837 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2838 | stream_putl (s, 0); | |
2839 | stream_put (s, &attr->extra->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
2840 | stream_putl (s, 0); /* RD = 0, per RFC */ | |
2841 | stream_putl (s, 0); | |
2842 | stream_put (s, &attr->extra->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
2843 | } | |
2844 | break; | |
2845 | break; | |
2846 | default: | |
2847 | break; | |
2848 | } | |
8c71e481 PM |
2849 | default: |
2850 | break; | |
2851 | } | |
2852 | ||
2853 | /* SNPA */ | |
2854 | stream_putc (s, 0); | |
2855 | return sizep; | |
2856 | } | |
2857 | ||
2858 | void | |
2859 | bgp_packet_mpattr_prefix (struct stream *s, afi_t afi, safi_t safi, | |
2860 | struct prefix *p, struct prefix_rd *prd, | |
adbac85e | 2861 | u_char *tag, int addpath_encode, |
b18825eb | 2862 | u_int32_t addpath_tx_id, struct attr *attr) |
8c71e481 | 2863 | { |
93b73dfa | 2864 | if (safi == SAFI_MPLS_VPN) |
8c71e481 | 2865 | { |
adbac85e DW |
2866 | if (addpath_encode) |
2867 | stream_putl(s, addpath_tx_id); | |
8c71e481 PM |
2868 | /* Tag, RD, Prefix write. */ |
2869 | stream_putc (s, p->prefixlen + 88); | |
2870 | stream_put (s, tag, 3); | |
2871 | stream_put (s, prd->val, 8); | |
2872 | stream_put (s, &p->u.prefix, PSIZE (p->prefixlen)); | |
8c71e481 | 2873 | } |
b00383ea | 2874 | else if (safi == SAFI_EVPN) |
b18825eb PG |
2875 | { |
2876 | bgp_packet_mpattr_route_type_5(s, p, prd, tag, attr); | |
2877 | } | |
93b73dfa LB |
2878 | else |
2879 | stream_put_prefix_addpath (s, p, addpath_encode, addpath_tx_id); | |
2880 | } | |
2881 | ||
2882 | size_t | |
2883 | bgp_packet_mpattr_prefix_size (afi_t afi, safi_t safi, struct prefix *p) | |
2884 | { | |
2885 | int size = PSIZE (p->prefixlen); | |
2886 | if (safi == SAFI_MPLS_VPN) | |
2887 | size += 88; | |
2888 | return size; | |
8c71e481 PM |
2889 | } |
2890 | ||
f4c89855 | 2891 | /* |
65efcfce LB |
2892 | * Encodes the tunnel encapsulation attribute, |
2893 | * and with ENABLE_BGP_VNC the VNC attribute which uses | |
2894 | * almost the same TLV format | |
f4c89855 LB |
2895 | */ |
2896 | static void | |
2897 | bgp_packet_mpattr_tea( | |
2898 | struct bgp *bgp, | |
2899 | struct peer *peer, | |
2900 | struct stream *s, | |
2901 | struct attr *attr, | |
2902 | uint8_t attrtype) | |
2903 | { | |
2904 | unsigned int attrlenfield = 0; | |
587ff0fd | 2905 | unsigned int attrhdrlen = 0; |
f4c89855 LB |
2906 | struct bgp_attr_encap_subtlv *subtlvs; |
2907 | struct bgp_attr_encap_subtlv *st; | |
2908 | const char *attrname; | |
2909 | ||
ac73d8fb LB |
2910 | if (!attr || !attr->extra || |
2911 | (attrtype == BGP_ATTR_ENCAP && | |
2912 | (!attr->extra->encap_tunneltype || | |
2913 | attr->extra->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
f4c89855 LB |
2914 | return; |
2915 | ||
2916 | switch (attrtype) { | |
2917 | case BGP_ATTR_ENCAP: | |
2918 | attrname = "Tunnel Encap"; | |
2919 | subtlvs = attr->extra->encap_subtlvs; | |
2920 | ||
2921 | /* | |
2922 | * The tunnel encap attr has an "outer" tlv. | |
2923 | * T = tunneltype, | |
2924 | * L = total length of subtlvs, | |
2925 | * V = concatenated subtlvs. | |
2926 | */ | |
2927 | attrlenfield = 2 + 2; /* T + L */ | |
587ff0fd | 2928 | attrhdrlen = 1 + 1; /* subTLV T + L */ |
f4c89855 LB |
2929 | break; |
2930 | ||
65efcfce LB |
2931 | #if ENABLE_BGP_VNC |
2932 | case BGP_ATTR_VNC: | |
2933 | attrname = "VNC"; | |
2934 | subtlvs = attr->extra->vnc_subtlvs; | |
2935 | attrlenfield = 0; /* no outer T + L */ | |
2936 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2937 | break; | |
2938 | #endif | |
2939 | ||
f4c89855 LB |
2940 | default: |
2941 | assert(0); | |
2942 | } | |
2943 | ||
f4c89855 LB |
2944 | /* compute attr length */ |
2945 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd | 2946 | attrlenfield += (attrhdrlen + st->length); |
f4c89855 LB |
2947 | } |
2948 | ||
f4c89855 LB |
2949 | if (attrlenfield > 0xffff) { |
2950 | zlog_info ("%s attribute is too long (length=%d), can't send it", | |
2951 | attrname, | |
2952 | attrlenfield); | |
2953 | return; | |
2954 | } | |
2955 | ||
2956 | if (attrlenfield > 0xff) { | |
2957 | /* 2-octet length field */ | |
2958 | stream_putc (s, | |
2959 | BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
2960 | stream_putc (s, attrtype); | |
2961 | stream_putw (s, attrlenfield & 0xffff); | |
2962 | } else { | |
2963 | /* 1-octet length field */ | |
2964 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL); | |
2965 | stream_putc (s, attrtype); | |
2966 | stream_putc (s, attrlenfield & 0xff); | |
2967 | } | |
2968 | ||
2969 | if (attrtype == BGP_ATTR_ENCAP) { | |
2970 | /* write outer T+L */ | |
2971 | stream_putw(s, attr->extra->encap_tunneltype); | |
2972 | stream_putw(s, attrlenfield - 4); | |
2973 | } | |
2974 | ||
2975 | /* write each sub-tlv */ | |
2976 | for (st = subtlvs; st; st = st->next) { | |
587ff0fd LB |
2977 | if (attrtype == BGP_ATTR_ENCAP) { |
2978 | stream_putc (s, st->type); | |
2979 | stream_putc (s, st->length); | |
65efcfce LB |
2980 | #if ENABLE_BGP_VNC |
2981 | } else { | |
2982 | stream_putw (s, st->type); | |
2983 | stream_putw (s, st->length); | |
2984 | #endif | |
587ff0fd | 2985 | } |
f4c89855 LB |
2986 | stream_put (s, st->value, st->length); |
2987 | } | |
2988 | } | |
f4c89855 | 2989 | |
8c71e481 PM |
2990 | void |
2991 | bgp_packet_mpattr_end (struct stream *s, size_t sizep) | |
2992 | { | |
2993 | /* Set MP attribute length. Don't count the (2) bytes used to encode | |
2994 | the attr length */ | |
2995 | stream_putw_at (s, sizep, (stream_get_endp (s) - sizep) - 2); | |
2996 | } | |
2997 | ||
718e3744 | 2998 | /* Make attribute packet. */ |
2999 | bgp_size_t | |
3000 | bgp_packet_attribute (struct bgp *bgp, struct peer *peer, | |
8c71e481 | 3001 | struct stream *s, struct attr *attr, |
3f9c7369 | 3002 | struct bpacket_attr_vec_arr *vecarr, |
8c71e481 | 3003 | struct prefix *p, afi_t afi, safi_t safi, |
adbac85e DW |
3004 | struct peer *from, struct prefix_rd *prd, u_char *tag, |
3005 | int addpath_encode, | |
3006 | u_int32_t addpath_tx_id) | |
718e3744 | 3007 | { |
fe69a505 | 3008 | size_t cp; |
0b2aa3a0 | 3009 | size_t aspath_sizep; |
718e3744 | 3010 | struct aspath *aspath; |
0b2aa3a0 PJ |
3011 | int send_as4_path = 0; |
3012 | int send_as4_aggregator = 0; | |
3013 | int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
718e3744 | 3014 | |
3015 | if (! bgp) | |
75aead62 | 3016 | bgp = peer->bgp; |
718e3744 | 3017 | |
3018 | /* Remember current pointer. */ | |
9985f83c | 3019 | cp = stream_get_endp (s); |
718e3744 | 3020 | |
8a92a8a0 DS |
3021 | if (p && !((afi == AFI_IP && safi == SAFI_UNICAST) && |
3022 | !peer_cap_enhe(peer))) | |
8c71e481 | 3023 | { |
93b73dfa LB |
3024 | size_t mpattrlen_pos = 0; |
3025 | ||
8a92a8a0 | 3026 | mpattrlen_pos = bgp_packet_mpattr_start(s, afi, safi, |
fe3ca08f LB |
3027 | (peer_cap_enhe(peer) ? AFI_IP6 : |
3028 | AFI_MAX), /* get from NH */ | |
8a92a8a0 | 3029 | vecarr, attr); |
adbac85e | 3030 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, tag, |
b18825eb | 3031 | addpath_encode, addpath_tx_id, attr); |
8c71e481 PM |
3032 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
3033 | } | |
3034 | ||
718e3744 | 3035 | /* Origin attribute. */ |
3036 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3037 | stream_putc (s, BGP_ATTR_ORIGIN); | |
3038 | stream_putc (s, 1); | |
3039 | stream_putc (s, attr->origin); | |
3040 | ||
3041 | /* AS path attribute. */ | |
3042 | ||
3043 | /* If remote-peer is EBGP */ | |
6d85b15b | 3044 | if (peer->sort == BGP_PEER_EBGP |
718e3744 | 3045 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED) |
fe69a505 | 3046 | || attr->aspath->segments == NULL) |
fee0f4c6 | 3047 | && (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT))) |
718e3744 | 3048 | { |
3049 | aspath = aspath_dup (attr->aspath); | |
3050 | ||
66b199b2 DS |
3051 | /* Even though we may not be configured for confederations we may have |
3052 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3053 | aspath = aspath_delete_confed_seq (aspath); | |
3054 | ||
718e3744 | 3055 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) |
3056 | { | |
66b199b2 | 3057 | /* Stuff our path CONFED_ID on the front */ |
718e3744 | 3058 | aspath = aspath_add_seq (aspath, bgp->confed_id); |
3059 | } | |
3060 | else | |
3061 | { | |
9d3f9705 AC |
3062 | if (peer->change_local_as) { |
3063 | /* If replace-as is specified, we only use the change_local_as when | |
3064 | advertising routes. */ | |
3065 | if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) { | |
3066 | aspath = aspath_add_seq (aspath, peer->local_as); | |
3067 | } | |
718e3744 | 3068 | aspath = aspath_add_seq (aspath, peer->change_local_as); |
9d3f9705 AC |
3069 | } else { |
3070 | aspath = aspath_add_seq (aspath, peer->local_as); | |
3071 | } | |
718e3744 | 3072 | } |
3073 | } | |
6d85b15b | 3074 | else if (peer->sort == BGP_PEER_CONFED) |
718e3744 | 3075 | { |
3076 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */ | |
3077 | aspath = aspath_dup (attr->aspath); | |
3078 | aspath = aspath_add_confed_seq (aspath, peer->local_as); | |
3079 | } | |
3080 | else | |
3081 | aspath = attr->aspath; | |
3082 | ||
0b2aa3a0 PJ |
3083 | /* If peer is not AS4 capable, then: |
3084 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3085 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment | |
3086 | * types are in it (i.e. exclude them if they are there) | |
3087 | * AND do this only if there is at least one asnum > 65535 in the path! | |
3088 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change | |
3089 | * all ASnums > 65535 to BGP_AS_TRANS | |
3090 | */ | |
3091 | ||
3092 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3093 | stream_putc (s, BGP_ATTR_AS_PATH); | |
3094 | aspath_sizep = stream_get_endp (s); | |
3095 | stream_putw (s, 0); | |
3096 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit)); | |
3097 | ||
3098 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3099 | * in the path | |
3100 | */ | |
3101 | if (!use32bit && aspath_has_as4 (aspath)) | |
3102 | send_as4_path = 1; /* we'll do this later, at the correct place */ | |
3103 | ||
718e3744 | 3104 | /* Nexthop attribute. */ |
93b73dfa | 3105 | if (afi == AFI_IP && safi == SAFI_UNICAST && !peer_cap_enhe(peer)) |
718e3744 | 3106 | { |
8a92a8a0 DS |
3107 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)) |
3108 | { | |
3109 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3110 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3111 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3112 | stream_putc (s, 4); | |
3113 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
3114 | } | |
3115 | else if (safi == SAFI_UNICAST && peer_cap_enhe(from)) | |
3116 | { | |
3117 | /* | |
3118 | * Likely this is the case when an IPv4 prefix was received with | |
3119 | * Extended Next-hop capability and now being advertised to | |
3120 | * non-ENHE peers. | |
3121 | * Setting the mandatory (ipv4) next-hop attribute here to enable | |
3122 | * implicit next-hop self with correct (ipv4 address family). | |
3123 | */ | |
3124 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3125 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3126 | bpacket_attr_vec_arr_set_vec (vecarr, BGP_ATTR_VEC_NH, s, NULL); | |
3127 | stream_putc (s, 4); | |
3128 | stream_put_ipv4 (s, 0); | |
3129 | } | |
718e3744 | 3130 | } |
3131 | ||
3132 | /* MED attribute. */ | |
abc920f8 DS |
3133 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC) || |
3134 | bgp->maxmed_active) | |
718e3744 | 3135 | { |
3136 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3137 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3138 | stream_putc (s, 4); | |
abc920f8 | 3139 | stream_putl (s, (bgp->maxmed_active ? bgp->maxmed_value : attr->med)); |
718e3744 | 3140 | } |
3141 | ||
3142 | /* Local preference. */ | |
6d85b15b JBD |
3143 | if (peer->sort == BGP_PEER_IBGP || |
3144 | peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3145 | { |
3146 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3147 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3148 | stream_putc (s, 4); | |
3149 | stream_putl (s, attr->local_pref); | |
3150 | } | |
3151 | ||
3152 | /* Atomic aggregate. */ | |
3153 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3154 | { | |
3155 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3156 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3157 | stream_putc (s, 0); | |
3158 | } | |
3159 | ||
3160 | /* Aggregator. */ | |
3161 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3162 | { | |
fb982c25 | 3163 | assert (attr->extra); |
0b2aa3a0 PJ |
3164 | |
3165 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
718e3744 | 3166 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
3167 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
3168 | |
3169 | if (use32bit) | |
3170 | { | |
3171 | /* AS4 capable peer */ | |
3172 | stream_putc (s, 8); | |
3173 | stream_putl (s, attr->extra->aggregator_as); | |
3174 | } | |
3175 | else | |
3176 | { | |
3177 | /* 2-byte AS peer */ | |
3178 | stream_putc (s, 6); | |
3179 | ||
3180 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */ | |
3181 | if ( attr->extra->aggregator_as > 65535 ) | |
3182 | { | |
3183 | stream_putw (s, BGP_AS_TRANS); | |
3184 | ||
3185 | /* we have to send AS4_AGGREGATOR, too. | |
3186 | * we'll do that later in order to send attributes in ascending | |
3187 | * order. | |
3188 | */ | |
3189 | send_as4_aggregator = 1; | |
3190 | } | |
3191 | else | |
3192 | stream_putw (s, (u_int16_t) attr->extra->aggregator_as); | |
3193 | } | |
fb982c25 | 3194 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 3195 | } |
3196 | ||
3197 | /* Community attribute. */ | |
3198 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3199 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))) | |
3200 | { | |
3201 | if (attr->community->size * 4 > 255) | |
3202 | { | |
3203 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3204 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3205 | stream_putw (s, attr->community->size * 4); | |
3206 | } | |
3207 | else | |
3208 | { | |
3209 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3210 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3211 | stream_putc (s, attr->community->size * 4); | |
3212 | } | |
3213 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3214 | } | |
3215 | ||
57d187bc JS |
3216 | /* |
3217 | * Large Community attribute. | |
3218 | */ | |
3219 | if (attr->extra && | |
3220 | CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3221 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES))) | |
3222 | { | |
3223 | if (attr->extra->lcommunity->size * 12 > 255) | |
2acb4ac2 DL |
3224 | { |
3225 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3226 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
3227 | stream_putw (s, attr->extra->lcommunity->size * 12); | |
3228 | } | |
57d187bc | 3229 | else |
2acb4ac2 DL |
3230 | { |
3231 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3232 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
3233 | stream_putc (s, attr->extra->lcommunity->size * 12); | |
3234 | } | |
57d187bc JS |
3235 | stream_put (s, attr->extra->lcommunity->val, attr->extra->lcommunity->size * 12); |
3236 | } | |
3237 | ||
718e3744 | 3238 | /* Route Reflector. */ |
6d85b15b | 3239 | if (peer->sort == BGP_PEER_IBGP |
718e3744 | 3240 | && from |
6d85b15b | 3241 | && from->sort == BGP_PEER_IBGP) |
718e3744 | 3242 | { |
3243 | /* Originator ID. */ | |
3244 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3245 | stream_putc (s, BGP_ATTR_ORIGINATOR_ID); | |
3246 | stream_putc (s, 4); | |
3247 | ||
3248 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
fb982c25 | 3249 | stream_put_in_addr (s, &attr->extra->originator_id); |
34c3f81b PJ |
3250 | else |
3251 | stream_put_in_addr (s, &from->remote_id); | |
718e3744 | 3252 | |
3253 | /* Cluster list. */ | |
3254 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3255 | stream_putc (s, BGP_ATTR_CLUSTER_LIST); | |
3256 | ||
9eda90ce | 3257 | if (attr->extra && attr->extra->cluster) |
718e3744 | 3258 | { |
fb982c25 | 3259 | stream_putc (s, attr->extra->cluster->length + 4); |
718e3744 | 3260 | /* If this peer configuration's parent BGP has cluster_id. */ |
3261 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3262 | stream_put_in_addr (s, &bgp->cluster_id); | |
3263 | else | |
3264 | stream_put_in_addr (s, &bgp->router_id); | |
fb982c25 PJ |
3265 | stream_put (s, attr->extra->cluster->list, |
3266 | attr->extra->cluster->length); | |
718e3744 | 3267 | } |
3268 | else | |
3269 | { | |
3270 | stream_putc (s, 4); | |
3271 | /* If this peer configuration's parent BGP has cluster_id. */ | |
3272 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3273 | stream_put_in_addr (s, &bgp->cluster_id); | |
3274 | else | |
3275 | stream_put_in_addr (s, &bgp->router_id); | |
3276 | } | |
3277 | } | |
3278 | ||
718e3744 | 3279 | /* Extended Communities attribute. */ |
3280 | if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3281 | && (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES))) | |
3282 | { | |
fb982c25 PJ |
3283 | struct attr_extra *attre = attr->extra; |
3284 | ||
3285 | assert (attre); | |
3286 | ||
6d85b15b JBD |
3287 | if (peer->sort == BGP_PEER_IBGP |
3288 | || peer->sort == BGP_PEER_CONFED) | |
718e3744 | 3289 | { |
fb982c25 | 3290 | if (attre->ecommunity->size * 8 > 255) |
4372df71 | 3291 | { |
3292 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3293 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 3294 | stream_putw (s, attre->ecommunity->size * 8); |
4372df71 | 3295 | } |
3296 | else | |
3297 | { | |
3298 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3299 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
fb982c25 | 3300 | stream_putc (s, attre->ecommunity->size * 8); |
4372df71 | 3301 | } |
fb982c25 | 3302 | stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8); |
718e3744 | 3303 | } |
3304 | else | |
3305 | { | |
5228ad27 | 3306 | u_int8_t *pnt; |
4372df71 | 3307 | int tbit; |
3308 | int ecom_tr_size = 0; | |
3309 | int i; | |
3310 | ||
fb982c25 | 3311 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 3312 | { |
fb982c25 | 3313 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 3314 | tbit = *pnt; |
3315 | ||
3316 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3317 | continue; | |
3318 | ||
3319 | ecom_tr_size++; | |
3320 | } | |
3321 | ||
3322 | if (ecom_tr_size) | |
3323 | { | |
3324 | if (ecom_tr_size * 8 > 255) | |
3325 | { | |
3326 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3327 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3328 | stream_putw (s, ecom_tr_size * 8); | |
3329 | } | |
3330 | else | |
3331 | { | |
3332 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3333 | stream_putc (s, BGP_ATTR_EXT_COMMUNITIES); | |
3334 | stream_putc (s, ecom_tr_size * 8); | |
3335 | } | |
3336 | ||
fb982c25 | 3337 | for (i = 0; i < attre->ecommunity->size; i++) |
4372df71 | 3338 | { |
fb982c25 | 3339 | pnt = attre->ecommunity->val + (i * 8); |
4372df71 | 3340 | tbit = *pnt; |
3341 | ||
3342 | if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3343 | continue; | |
3344 | ||
3345 | stream_put (s, pnt, 8); | |
3346 | } | |
3347 | } | |
718e3744 | 3348 | } |
718e3744 | 3349 | } |
0b2aa3a0 PJ |
3350 | |
3351 | if ( send_as4_path ) | |
3352 | { | |
3353 | /* If the peer is NOT As4 capable, AND */ | |
3354 | /* there are ASnums > 65535 in path THEN | |
3355 | * give out AS4_PATH */ | |
3356 | ||
3357 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3358 | * path segments! | |
3359 | * Hm, I wonder... confederation things *should* only be at | |
3360 | * the beginning of an aspath, right? Then we should use | |
3361 | * aspath_delete_confed_seq for this, because it is already | |
3362 | * there! (JK) | |
3363 | * Folks, talk to me: what is reasonable here!? | |
3364 | */ | |
3365 | aspath = aspath_delete_confed_seq (aspath); | |
3366 | ||
3367 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
3368 | stream_putc (s, BGP_ATTR_AS4_PATH); | |
3369 | aspath_sizep = stream_get_endp (s); | |
3370 | stream_putw (s, 0); | |
3371 | stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1)); | |
3372 | } | |
3373 | ||
3374 | if (aspath != attr->aspath) | |
3375 | aspath_free (aspath); | |
3376 | ||
3377 | if ( send_as4_aggregator ) | |
3378 | { | |
3379 | assert (attr->extra); | |
3380 | ||
3381 | /* send AS4_AGGREGATOR, at this place */ | |
3382 | /* this section of code moved here in order to ensure the correct | |
3383 | * *ascending* order of attributes | |
3384 | */ | |
3385 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3386 | stream_putc (s, BGP_ATTR_AS4_AGGREGATOR); | |
3387 | stream_putc (s, 8); | |
3388 | stream_putl (s, attr->extra->aggregator_as); | |
3389 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); | |
3390 | } | |
587ff0fd | 3391 | |
aee875b5 PG |
3392 | if (((afi == AFI_IP || afi == AFI_IP6) && |
3393 | (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) || | |
3394 | (afi == AFI_L2VPN && safi == SAFI_EVPN)) | |
587ff0fd LB |
3395 | { |
3396 | /* Tunnel Encap attribute */ | |
3397 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3398 | |
3399 | #if ENABLE_BGP_VNC | |
3400 | /* VNC attribute */ | |
3401 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
3402 | #endif | |
587ff0fd LB |
3403 | } |
3404 | ||
718e3744 | 3405 | /* Unknown transit attribute. */ |
fb982c25 PJ |
3406 | if (attr->extra && attr->extra->transit) |
3407 | stream_put (s, attr->extra->transit->val, attr->extra->transit->length); | |
718e3744 | 3408 | |
3409 | /* Return total size of attribute. */ | |
9985f83c | 3410 | return stream_get_endp (s) - cp; |
718e3744 | 3411 | } |
3412 | ||
8c71e481 PM |
3413 | size_t |
3414 | bgp_packet_mpunreach_start (struct stream *s, afi_t afi, safi_t safi) | |
718e3744 | 3415 | { |
718e3744 | 3416 | unsigned long attrlen_pnt; |
b58ed1f8 | 3417 | iana_afi_t pkt_afi; |
9cabb64b | 3418 | safi_t pkt_safi; |
718e3744 | 3419 | |
8c71e481 PM |
3420 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3421 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN); | |
718e3744 | 3422 | stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI); |
3423 | ||
9985f83c | 3424 | attrlen_pnt = stream_get_endp (s); |
8c71e481 | 3425 | stream_putw (s, 0); /* Length of this attribute. */ |
718e3744 | 3426 | |
9cabb64b | 3427 | /* Convert AFI, SAFI to values for packet. */ |
3428 | bgp_map_afi_safi_int2iana (afi, safi, &pkt_afi, &pkt_safi); | |
3429 | ||
3430 | stream_putw (s, pkt_afi); | |
3431 | stream_putc (s, pkt_safi); | |
3432 | ||
8c71e481 PM |
3433 | return attrlen_pnt; |
3434 | } | |
718e3744 | 3435 | |
8c71e481 PM |
3436 | void |
3437 | bgp_packet_mpunreach_prefix (struct stream *s, struct prefix *p, | |
3438 | afi_t afi, safi_t safi, struct prefix_rd *prd, | |
adbac85e | 3439 | u_char *tag, int addpath_encode, |
b18825eb | 3440 | u_int32_t addpath_tx_id, struct attr *attr) |
8c71e481 | 3441 | { |
b18825eb PG |
3442 | return bgp_packet_mpattr_prefix (s, afi, safi, p, prd, |
3443 | tag, addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 3444 | } |
718e3744 | 3445 | |
8c71e481 PM |
3446 | void |
3447 | bgp_packet_mpunreach_end (struct stream *s, size_t attrlen_pnt) | |
3448 | { | |
93b73dfa | 3449 | bgp_packet_mpattr_end (s, attrlen_pnt); |
718e3744 | 3450 | } |
3451 | ||
3452 | /* Initialization of attribute. */ | |
3453 | void | |
fe69a505 | 3454 | bgp_attr_init (void) |
718e3744 | 3455 | { |
718e3744 | 3456 | aspath_init (); |
3457 | attrhash_init (); | |
3458 | community_init (); | |
3459 | ecommunity_init (); | |
57d187bc | 3460 | lcommunity_init (); |
718e3744 | 3461 | cluster_init (); |
3462 | transit_init (); | |
bede7744 | 3463 | encap_init (); |
718e3744 | 3464 | } |
3465 | ||
228da428 CC |
3466 | void |
3467 | bgp_attr_finish (void) | |
3468 | { | |
3469 | aspath_finish (); | |
3470 | attrhash_finish (); | |
3471 | community_finish (); | |
3472 | ecommunity_finish (); | |
57d187bc | 3473 | lcommunity_finish (); |
228da428 CC |
3474 | cluster_finish (); |
3475 | transit_finish (); | |
bede7744 | 3476 | encap_finish (); |
228da428 CC |
3477 | } |
3478 | ||
718e3744 | 3479 | /* Make attribute packet. */ |
3480 | void | |
a384592f | 3481 | bgp_dump_routes_attr (struct stream *s, struct attr *attr, |
3482 | struct prefix *prefix) | |
718e3744 | 3483 | { |
3484 | unsigned long cp; | |
3485 | unsigned long len; | |
0b2aa3a0 | 3486 | size_t aspath_lenp; |
718e3744 | 3487 | struct aspath *aspath; |
adbac85e DW |
3488 | int addpath_encode = 0; |
3489 | u_int32_t addpath_tx_id = 0; | |
718e3744 | 3490 | |
3491 | /* Remember current pointer. */ | |
9985f83c | 3492 | cp = stream_get_endp (s); |
718e3744 | 3493 | |
3494 | /* Place holder of length. */ | |
3495 | stream_putw (s, 0); | |
3496 | ||
3497 | /* Origin attribute. */ | |
3498 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3499 | stream_putc (s, BGP_ATTR_ORIGIN); | |
3500 | stream_putc (s, 1); | |
3501 | stream_putc (s, attr->origin); | |
3502 | ||
3503 | aspath = attr->aspath; | |
0b2aa3a0 PJ |
3504 | |
3505 | stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3506 | stream_putc (s, BGP_ATTR_AS_PATH); | |
3507 | aspath_lenp = stream_get_endp (s); | |
3508 | stream_putw (s, 0); | |
3509 | ||
3510 | stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1)); | |
718e3744 | 3511 | |
3512 | /* Nexthop attribute. */ | |
a384592f | 3513 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ |
56c1f7d8 | 3514 | if(prefix != NULL && prefix->family != AF_INET6) |
a384592f | 3515 | { |
3516 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3517 | stream_putc (s, BGP_ATTR_NEXT_HOP); | |
3518 | stream_putc (s, 4); | |
3519 | stream_put_ipv4 (s, attr->nexthop.s_addr); | |
3520 | } | |
718e3744 | 3521 | |
3522 | /* MED attribute. */ | |
3523 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC)) | |
3524 | { | |
3525 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL); | |
3526 | stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC); | |
3527 | stream_putc (s, 4); | |
3528 | stream_putl (s, attr->med); | |
3529 | } | |
3530 | ||
3531 | /* Local preference. */ | |
3532 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)) | |
3533 | { | |
3534 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3535 | stream_putc (s, BGP_ATTR_LOCAL_PREF); | |
3536 | stream_putc (s, 4); | |
3537 | stream_putl (s, attr->local_pref); | |
3538 | } | |
3539 | ||
3540 | /* Atomic aggregate. */ | |
3541 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE)) | |
3542 | { | |
3543 | stream_putc (s, BGP_ATTR_FLAG_TRANS); | |
3544 | stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3545 | stream_putc (s, 0); | |
3546 | } | |
3547 | ||
3548 | /* Aggregator. */ | |
3549 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR)) | |
3550 | { | |
fb982c25 | 3551 | assert (attr->extra); |
718e3744 | 3552 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); |
3553 | stream_putc (s, BGP_ATTR_AGGREGATOR); | |
0b2aa3a0 PJ |
3554 | stream_putc (s, 8); |
3555 | stream_putl (s, attr->extra->aggregator_as); | |
fb982c25 | 3556 | stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr); |
718e3744 | 3557 | } |
3558 | ||
3559 | /* Community attribute. */ | |
3560 | if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)) | |
3561 | { | |
3562 | if (attr->community->size * 4 > 255) | |
3563 | { | |
3564 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3565 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3566 | stream_putw (s, attr->community->size * 4); | |
3567 | } | |
3568 | else | |
3569 | { | |
3570 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3571 | stream_putc (s, BGP_ATTR_COMMUNITIES); | |
3572 | stream_putc (s, attr->community->size * 4); | |
3573 | } | |
3574 | stream_put (s, attr->community->val, attr->community->size * 4); | |
3575 | } | |
3576 | ||
57d187bc JS |
3577 | /* Large Community attribute. */ |
3578 | if (attr->extra && attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LARGE_COMMUNITIES)) | |
3579 | { | |
3580 | if (attr->extra->lcommunity->size * 12 > 255) | |
2acb4ac2 DL |
3581 | { |
3582 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN); | |
3583 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
3584 | stream_putw (s, attr->extra->lcommunity->size * 12); | |
3585 | } | |
57d187bc | 3586 | else |
2acb4ac2 DL |
3587 | { |
3588 | stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS); | |
3589 | stream_putc (s, BGP_ATTR_LARGE_COMMUNITIES); | |
3590 | stream_putc (s, attr->extra->lcommunity->size * 12); | |
3591 | } | |
57d187bc JS |
3592 | |
3593 | stream_put (s, attr->extra->lcommunity->val, attr->extra->lcommunity->size * 12); | |
3594 | } | |
3595 | ||
a384592f | 3596 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ |
fb982c25 | 3597 | if (prefix != NULL && prefix->family == AF_INET6 && attr->extra && |
801a9bcc DS |
3598 | (attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL || |
3599 | attr->extra->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) ) | |
a384592f | 3600 | { |
3601 | int sizep; | |
fb982c25 PJ |
3602 | struct attr_extra *attre = attr->extra; |
3603 | ||
a384592f | 3604 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); |
3605 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
9985f83c | 3606 | sizep = stream_get_endp (s); |
a384592f | 3607 | |
3608 | /* MP header */ | |
fb982c25 | 3609 | stream_putc (s, 0); /* Marker: Attribute length. */ |
a384592f | 3610 | stream_putw(s, AFI_IP6); /* AFI */ |
3611 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3612 | ||
3613 | /* Next hop */ | |
fb982c25 | 3614 | stream_putc(s, attre->mp_nexthop_len); |
801a9bcc DS |
3615 | stream_put(s, &attre->mp_nexthop_global, IPV6_MAX_BYTELEN); |
3616 | if (attre->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3617 | stream_put(s, &attre->mp_nexthop_local, IPV6_MAX_BYTELEN); | |
a384592f | 3618 | |
3619 | /* SNPA */ | |
3620 | stream_putc(s, 0); | |
3621 | ||
3622 | /* Prefix */ | |
adbac85e | 3623 | stream_put_prefix_addpath (s, prefix, addpath_encode, addpath_tx_id); |
a384592f | 3624 | |
3625 | /* Set MP attribute length. */ | |
9985f83c | 3626 | stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1); |
a384592f | 3627 | } |
a384592f | 3628 | |
718e3744 | 3629 | /* Return total size of attribute. */ |
9985f83c | 3630 | len = stream_get_endp (s) - cp - 2; |
718e3744 | 3631 | stream_putw_at (s, cp, len); |
3632 | } |