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718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
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 along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 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" | |
9bedbb1e | 42 | #include "bgpd/bgp_label.h" |
718e3744 | 43 | #include "bgpd/bgp_packet.h" |
44 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 45 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 46 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 47 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 48 | #if ENABLE_BGP_VNC |
d62a17ae | 49 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
50 | #include "bgp_encap_types.h" | |
51 | #include "bgp_vnc_types.h" | |
65efcfce | 52 | #endif |
b18825eb PG |
53 | #include "bgp_encap_types.h" |
54 | #include "bgp_evpn.h" | |
6b0655a2 | 55 | |
718e3744 | 56 | /* Attribute strings for logging. */ |
d62a17ae | 57 | static const struct message attr_str[] = { |
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"}, | |
67 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
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"}, | |
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"}, | |
77 | {BGP_ATTR_ENCAP, "ENCAP"}, | |
65efcfce | 78 | #if ENABLE_BGP_VNC |
d62a17ae | 79 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 80 | #endif |
d62a17ae | 81 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
82 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
83 | {0}}; | |
afcb7679 | 84 | |
9d303b37 DL |
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 | |
91 | this list */ | |
92 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
93 | {0}}; | |
6b0655a2 | 94 | |
9bddac4b | 95 | static struct hash *cluster_hash; |
718e3744 | 96 | |
d62a17ae | 97 | static void *cluster_hash_alloc(void *p) |
718e3744 | 98 | { |
d62a17ae | 99 | const struct cluster_list *val = (const struct cluster_list *)p; |
100 | struct cluster_list *cluster; | |
718e3744 | 101 | |
d62a17ae | 102 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
103 | cluster->length = val->length; | |
718e3744 | 104 | |
d62a17ae | 105 | if (cluster->length) { |
106 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
107 | memcpy(cluster->list, val->list, val->length); | |
108 | } else | |
109 | cluster->list = NULL; | |
718e3744 | 110 | |
d62a17ae | 111 | cluster->refcnt = 0; |
718e3744 | 112 | |
d62a17ae | 113 | return cluster; |
718e3744 | 114 | } |
115 | ||
116 | /* Cluster list related functions. */ | |
d62a17ae | 117 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 118 | { |
d62a17ae | 119 | struct cluster_list tmp; |
120 | struct cluster_list *cluster; | |
718e3744 | 121 | |
d62a17ae | 122 | tmp.length = length; |
123 | tmp.list = pnt; | |
718e3744 | 124 | |
d62a17ae | 125 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
126 | cluster->refcnt++; | |
127 | return cluster; | |
718e3744 | 128 | } |
129 | ||
d62a17ae | 130 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 131 | { |
d62a17ae | 132 | int i; |
133 | ||
134 | for (i = 0; i < cluster->length / 4; i++) | |
135 | if (cluster->list[i].s_addr == originator.s_addr) | |
136 | return 1; | |
137 | return 0; | |
718e3744 | 138 | } |
139 | ||
d62a17ae | 140 | static unsigned int cluster_hash_key_make(void *p) |
718e3744 | 141 | { |
d62a17ae | 142 | const struct cluster_list *cluster = p; |
718e3744 | 143 | |
d62a17ae | 144 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 145 | } |
146 | ||
d62a17ae | 147 | static int cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 148 | { |
d62a17ae | 149 | const struct cluster_list *cluster1 = p1; |
150 | const struct cluster_list *cluster2 = p2; | |
923de654 | 151 | |
d62a17ae | 152 | return (cluster1->length == cluster2->length |
153 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
154 | == 0); | |
718e3744 | 155 | } |
156 | ||
d62a17ae | 157 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 158 | { |
d62a17ae | 159 | if (cluster->list) |
160 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); | |
161 | XFREE(MTYPE_CLUSTER, cluster); | |
718e3744 | 162 | } |
163 | ||
d62a17ae | 164 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 165 | { |
d62a17ae | 166 | struct cluster_list *find; |
718e3744 | 167 | |
d62a17ae | 168 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
169 | find->refcnt++; | |
718e3744 | 170 | |
d62a17ae | 171 | return find; |
718e3744 | 172 | } |
173 | ||
d62a17ae | 174 | void cluster_unintern(struct cluster_list *cluster) |
718e3744 | 175 | { |
d62a17ae | 176 | if (cluster->refcnt) |
177 | cluster->refcnt--; | |
718e3744 | 178 | |
d62a17ae | 179 | if (cluster->refcnt == 0) { |
180 | hash_release(cluster_hash, cluster); | |
181 | cluster_free(cluster); | |
182 | } | |
718e3744 | 183 | } |
184 | ||
d62a17ae | 185 | static void cluster_init(void) |
718e3744 | 186 | { |
3f65c5b1 DS |
187 | cluster_hash = hash_create(cluster_hash_key_make, |
188 | cluster_hash_cmp, | |
189 | "BGP Cluster"); | |
718e3744 | 190 | } |
228da428 | 191 | |
d62a17ae | 192 | static void cluster_finish(void) |
228da428 | 193 | { |
d62a17ae | 194 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
195 | hash_free(cluster_hash); | |
196 | cluster_hash = NULL; | |
228da428 | 197 | } |
6b0655a2 | 198 | |
bede7744 LB |
199 | static struct hash *encap_hash = NULL; |
200 | #if ENABLE_BGP_VNC | |
201 | static struct hash *vnc_hash = NULL; | |
202 | #endif | |
203 | ||
d62a17ae | 204 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 205 | { |
d62a17ae | 206 | struct bgp_attr_encap_subtlv *new; |
207 | struct bgp_attr_encap_subtlv *tail; | |
208 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 209 | |
d62a17ae | 210 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 211 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 212 | if (tail) { |
213 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
214 | tail = tail->next; | |
215 | } else { | |
216 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
217 | } | |
218 | assert(tail); | |
219 | memcpy(tail, p, size); | |
220 | tail->next = NULL; | |
f4c89855 | 221 | } |
f4c89855 | 222 | |
d62a17ae | 223 | return new; |
f4c89855 LB |
224 | } |
225 | ||
d62a17ae | 226 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 227 | { |
d62a17ae | 228 | struct bgp_attr_encap_subtlv *next; |
229 | while (p) { | |
230 | next = p->next; | |
231 | p->next = NULL; | |
232 | XFREE(MTYPE_ENCAP_TLV, p); | |
233 | p = next; | |
234 | } | |
f4c89855 LB |
235 | } |
236 | ||
d62a17ae | 237 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 238 | { |
d62a17ae | 239 | if (!attr) |
240 | return; | |
f4c89855 | 241 | |
d62a17ae | 242 | if (attr->encap_subtlvs) { |
243 | encap_free(attr->encap_subtlvs); | |
244 | attr->encap_subtlvs = NULL; | |
245 | } | |
65efcfce | 246 | #if ENABLE_BGP_VNC |
d62a17ae | 247 | if (attr->vnc_subtlvs) { |
248 | encap_free(attr->vnc_subtlvs); | |
249 | attr->vnc_subtlvs = NULL; | |
250 | } | |
65efcfce | 251 | #endif |
f4c89855 LB |
252 | } |
253 | ||
254 | /* | |
255 | * Compare encap sub-tlv chains | |
256 | * | |
257 | * 1 = equivalent | |
258 | * 0 = not equivalent | |
259 | * | |
260 | * This algorithm could be made faster if needed | |
261 | */ | |
d62a17ae | 262 | static int encap_same(struct bgp_attr_encap_subtlv *h1, |
263 | struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 264 | { |
d62a17ae | 265 | struct bgp_attr_encap_subtlv *p; |
266 | struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 267 | |
d62a17ae | 268 | if (h1 == h2) |
269 | return 1; | |
270 | if (h1 == NULL || h2 == NULL) | |
271 | return 0; | |
f4c89855 | 272 | |
d62a17ae | 273 | for (p = h1; p; p = p->next) { |
274 | for (q = h2; q; q = q->next) { | |
275 | if ((p->type == q->type) && (p->length == q->length) | |
276 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 277 | |
d62a17ae | 278 | break; |
279 | } | |
280 | } | |
281 | if (!q) | |
282 | return 0; | |
f4c89855 | 283 | } |
f4c89855 | 284 | |
d62a17ae | 285 | for (p = h2; p; p = p->next) { |
286 | for (q = h1; q; q = q->next) { | |
287 | if ((p->type == q->type) && (p->length == q->length) | |
288 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 289 | |
d62a17ae | 290 | break; |
291 | } | |
292 | } | |
293 | if (!q) | |
294 | return 0; | |
f4c89855 | 295 | } |
f4c89855 | 296 | |
d62a17ae | 297 | return 1; |
f4c89855 LB |
298 | } |
299 | ||
d62a17ae | 300 | static void *encap_hash_alloc(void *p) |
bede7744 | 301 | { |
d62a17ae | 302 | /* Encap structure is already allocated. */ |
303 | return p; | |
bede7744 LB |
304 | } |
305 | ||
d62a17ae | 306 | typedef enum { |
307 | ENCAP_SUBTLV_TYPE, | |
bede7744 | 308 | #if ENABLE_BGP_VNC |
d62a17ae | 309 | VNC_SUBTLV_TYPE |
bede7744 LB |
310 | #endif |
311 | } encap_subtlv_type; | |
312 | ||
313 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 314 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 315 | { |
d62a17ae | 316 | struct bgp_attr_encap_subtlv *find; |
317 | struct hash *hash = encap_hash; | |
bede7744 | 318 | #if ENABLE_BGP_VNC |
d62a17ae | 319 | if (type == VNC_SUBTLV_TYPE) |
320 | hash = vnc_hash; | |
bede7744 LB |
321 | #endif |
322 | ||
d62a17ae | 323 | find = hash_get(hash, encap, encap_hash_alloc); |
324 | if (find != encap) | |
325 | encap_free(encap); | |
326 | find->refcnt++; | |
bede7744 | 327 | |
d62a17ae | 328 | return find; |
bede7744 LB |
329 | } |
330 | ||
d62a17ae | 331 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
332 | encap_subtlv_type type) | |
bede7744 | 333 | { |
d62a17ae | 334 | struct bgp_attr_encap_subtlv *encap = *encapp; |
335 | if (encap->refcnt) | |
336 | encap->refcnt--; | |
bede7744 | 337 | |
d62a17ae | 338 | if (encap->refcnt == 0) { |
339 | struct hash *hash = encap_hash; | |
bede7744 | 340 | #if ENABLE_BGP_VNC |
d62a17ae | 341 | if (type == VNC_SUBTLV_TYPE) |
342 | hash = vnc_hash; | |
bede7744 | 343 | #endif |
d62a17ae | 344 | hash_release(hash, encap); |
345 | encap_free(encap); | |
346 | *encapp = NULL; | |
347 | } | |
bede7744 LB |
348 | } |
349 | ||
d62a17ae | 350 | static unsigned int encap_hash_key_make(void *p) |
bede7744 | 351 | { |
d62a17ae | 352 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 353 | |
d62a17ae | 354 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
355 | } |
356 | ||
d62a17ae | 357 | static int encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 358 | { |
d62a17ae | 359 | return encap_same((struct bgp_attr_encap_subtlv *)p1, |
360 | (struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
361 | } |
362 | ||
d62a17ae | 363 | static void encap_init(void) |
bede7744 | 364 | { |
3f65c5b1 DS |
365 | encap_hash = hash_create(encap_hash_key_make, |
366 | encap_hash_cmp, | |
367 | "BGP Encap Hash"); | |
bede7744 | 368 | #if ENABLE_BGP_VNC |
3f65c5b1 DS |
369 | vnc_hash = hash_create(encap_hash_key_make, |
370 | encap_hash_cmp, | |
371 | "BGP VNC Hash"); | |
bede7744 LB |
372 | #endif |
373 | } | |
374 | ||
d62a17ae | 375 | static void encap_finish(void) |
bede7744 | 376 | { |
d62a17ae | 377 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
378 | hash_free(encap_hash); | |
379 | encap_hash = NULL; | |
bede7744 | 380 | #if ENABLE_BGP_VNC |
d62a17ae | 381 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
382 | hash_free(vnc_hash); | |
383 | vnc_hash = NULL; | |
bede7744 LB |
384 | #endif |
385 | } | |
386 | ||
d62a17ae | 387 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 388 | { |
d62a17ae | 389 | if (!a1 && a2) |
390 | return false; | |
391 | if (!a2 && a1) | |
392 | return false; | |
393 | if (!a1 && !a2) | |
394 | return true; | |
395 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
396 | sizeof(struct overlay_index)); | |
684a7227 PG |
397 | } |
398 | ||
718e3744 | 399 | /* Unknown transit attribute. */ |
9bddac4b | 400 | static struct hash *transit_hash; |
718e3744 | 401 | |
d62a17ae | 402 | static void transit_free(struct transit *transit) |
718e3744 | 403 | { |
d62a17ae | 404 | if (transit->val) |
405 | XFREE(MTYPE_TRANSIT_VAL, transit->val); | |
406 | XFREE(MTYPE_TRANSIT, transit); | |
718e3744 | 407 | } |
408 | ||
d62a17ae | 409 | static void *transit_hash_alloc(void *p) |
718e3744 | 410 | { |
d62a17ae | 411 | /* Transit structure is already allocated. */ |
412 | return p; | |
718e3744 | 413 | } |
414 | ||
d62a17ae | 415 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 416 | { |
d62a17ae | 417 | struct transit *find; |
718e3744 | 418 | |
d62a17ae | 419 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
420 | if (find != transit) | |
421 | transit_free(transit); | |
422 | find->refcnt++; | |
718e3744 | 423 | |
d62a17ae | 424 | return find; |
718e3744 | 425 | } |
426 | ||
d62a17ae | 427 | void transit_unintern(struct transit *transit) |
718e3744 | 428 | { |
d62a17ae | 429 | if (transit->refcnt) |
430 | transit->refcnt--; | |
718e3744 | 431 | |
d62a17ae | 432 | if (transit->refcnt == 0) { |
433 | hash_release(transit_hash, transit); | |
434 | transit_free(transit); | |
435 | } | |
718e3744 | 436 | } |
437 | ||
d62a17ae | 438 | static unsigned int transit_hash_key_make(void *p) |
718e3744 | 439 | { |
d62a17ae | 440 | const struct transit *transit = p; |
718e3744 | 441 | |
d62a17ae | 442 | return jhash(transit->val, transit->length, 0); |
718e3744 | 443 | } |
444 | ||
d62a17ae | 445 | static int transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 446 | { |
d62a17ae | 447 | const struct transit *transit1 = p1; |
448 | const struct transit *transit2 = p2; | |
923de654 | 449 | |
d62a17ae | 450 | return (transit1->length == transit2->length |
451 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 452 | } |
453 | ||
d62a17ae | 454 | static void transit_init(void) |
718e3744 | 455 | { |
3f65c5b1 DS |
456 | transit_hash = hash_create(transit_hash_key_make, |
457 | transit_hash_cmp, | |
458 | "BGP Transit Hash"); | |
718e3744 | 459 | } |
228da428 | 460 | |
d62a17ae | 461 | static void transit_finish(void) |
228da428 | 462 | { |
d62a17ae | 463 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
464 | hash_free(transit_hash); | |
465 | transit_hash = NULL; | |
228da428 | 466 | } |
6b0655a2 | 467 | |
718e3744 | 468 | /* Attribute hash routines. */ |
9bddac4b | 469 | static struct hash *attrhash; |
718e3744 | 470 | |
fb982c25 PJ |
471 | /* Shallow copy of an attribute |
472 | * Though, not so shallow that it doesn't copy the contents | |
473 | * of the attr_extra pointed to by 'extra' | |
474 | */ | |
d62a17ae | 475 | void bgp_attr_dup(struct attr *new, struct attr *orig) |
fb982c25 | 476 | { |
d62a17ae | 477 | *new = *orig; |
fb982c25 PJ |
478 | } |
479 | ||
d62a17ae | 480 | unsigned long int attr_count(void) |
cbdfbaa5 | 481 | { |
d62a17ae | 482 | return attrhash->count; |
cbdfbaa5 PJ |
483 | } |
484 | ||
d62a17ae | 485 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 486 | { |
d62a17ae | 487 | return transit_hash->count; |
cbdfbaa5 PJ |
488 | } |
489 | ||
d62a17ae | 490 | unsigned int attrhash_key_make(void *p) |
718e3744 | 491 | { |
d62a17ae | 492 | const struct attr *attr = (struct attr *)p; |
493 | uint32_t key = 0; | |
c8e7b895 SH |
494 | #define MIX(val) key = jhash_1word(val, key) |
495 | ||
d62a17ae | 496 | MIX(attr->origin); |
497 | MIX(attr->nexthop.s_addr); | |
498 | MIX(attr->med); | |
499 | MIX(attr->local_pref); | |
d62a17ae | 500 | MIX(attr->aggregator_as); |
501 | MIX(attr->aggregator_addr.s_addr); | |
502 | MIX(attr->weight); | |
503 | MIX(attr->mp_nexthop_global_in.s_addr); | |
504 | MIX(attr->originator_id.s_addr); | |
505 | MIX(attr->tag); | |
506 | MIX(attr->label); | |
507 | MIX(attr->label_index); | |
508 | ||
509 | if (attr->aspath) | |
510 | MIX(aspath_key_make(attr->aspath)); | |
511 | if (attr->community) | |
512 | MIX(community_hash_make(attr->community)); | |
513 | ||
514 | if (attr->lcommunity) | |
515 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
516 | if (attr->ecommunity) | |
517 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
518 | if (attr->cluster) | |
519 | MIX(cluster_hash_key_make(attr->cluster)); | |
520 | if (attr->transit) | |
521 | MIX(transit_hash_key_make(attr->transit)); | |
522 | if (attr->encap_subtlvs) | |
523 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
bede7744 | 524 | #if ENABLE_BGP_VNC |
d62a17ae | 525 | if (attr->vnc_subtlvs) |
526 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 527 | #endif |
d62a17ae | 528 | MIX(attr->mp_nexthop_len); |
529 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
530 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
531 | ||
532 | return key; | |
533 | } | |
534 | ||
535 | int attrhash_cmp(const void *p1, const void *p2) | |
536 | { | |
537 | const struct attr *attr1 = p1; | |
538 | const struct attr *attr2 = p2; | |
539 | ||
540 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
541 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
542 | && attr1->aspath == attr2->aspath | |
543 | && attr1->community == attr2->community && attr1->med == attr2->med | |
544 | && attr1->local_pref == attr2->local_pref | |
545 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
546 | if (attr1->aggregator_as == attr2->aggregator_as | |
547 | && attr1->aggregator_addr.s_addr | |
548 | == attr2->aggregator_addr.s_addr | |
549 | && attr1->weight == attr2->weight | |
550 | && attr1->tag == attr2->tag | |
551 | && attr1->label_index == attr2->label_index | |
552 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
553 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, | |
554 | &attr2->mp_nexthop_global) | |
555 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
556 | &attr2->mp_nexthop_local) | |
557 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
558 | &attr2->mp_nexthop_global_in) | |
559 | && attr1->ecommunity == attr2->ecommunity | |
560 | && attr1->lcommunity == attr2->lcommunity | |
561 | && attr1->cluster == attr2->cluster | |
562 | && attr1->transit == attr2->transit | |
563 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
564 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
65efcfce | 565 | #if ENABLE_BGP_VNC |
d62a17ae | 566 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 567 | #endif |
d62a17ae | 568 | && IPV4_ADDR_SAME(&attr1->originator_id, |
569 | &attr2->originator_id) | |
570 | && overlay_index_same(attr1, attr2)) | |
571 | return 1; | |
572 | } | |
aadc0905 | 573 | |
d62a17ae | 574 | return 0; |
718e3744 | 575 | } |
576 | ||
d62a17ae | 577 | static void attrhash_init(void) |
718e3744 | 578 | { |
3f65c5b1 DS |
579 | attrhash = hash_create(attrhash_key_make, |
580 | attrhash_cmp, | |
581 | "BGP Attributes"); | |
718e3744 | 582 | } |
583 | ||
289d2501 LB |
584 | /* |
585 | * special for hash_clean below | |
586 | */ | |
d62a17ae | 587 | static void attr_vfree(void *attr) |
289d2501 | 588 | { |
d62a17ae | 589 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
590 | } |
591 | ||
d62a17ae | 592 | static void attrhash_finish(void) |
228da428 | 593 | { |
d62a17ae | 594 | hash_clean(attrhash, attr_vfree); |
595 | hash_free(attrhash); | |
596 | attrhash = NULL; | |
228da428 CC |
597 | } |
598 | ||
d62a17ae | 599 | static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty) |
718e3744 | 600 | { |
d62a17ae | 601 | struct attr *attr = backet->data; |
718e3744 | 602 | |
d62a17ae | 603 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
604 | inet_ntoa(attr->nexthop)); | |
718e3744 | 605 | } |
606 | ||
d62a17ae | 607 | void attr_show_all(struct vty *vty) |
718e3744 | 608 | { |
9d303b37 DL |
609 | hash_iterate(attrhash, (void (*)(struct hash_backet *, |
610 | void *))attr_show_all_iterator, | |
611 | vty); | |
718e3744 | 612 | } |
613 | ||
d62a17ae | 614 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 615 | { |
d62a17ae | 616 | struct attr *val = (struct attr *)p; |
617 | struct attr *attr; | |
718e3744 | 618 | |
d62a17ae | 619 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
620 | *attr = *val; | |
621 | if (val->encap_subtlvs) { | |
622 | val->encap_subtlvs = NULL; | |
623 | } | |
65efcfce | 624 | #if ENABLE_BGP_VNC |
d62a17ae | 625 | if (val->vnc_subtlvs) { |
626 | val->vnc_subtlvs = NULL; | |
627 | } | |
65efcfce | 628 | #endif |
d62a17ae | 629 | attr->refcnt = 0; |
630 | return attr; | |
718e3744 | 631 | } |
632 | ||
633 | /* Internet argument attribute. */ | |
d62a17ae | 634 | struct attr *bgp_attr_intern(struct attr *attr) |
635 | { | |
636 | struct attr *find; | |
637 | ||
638 | /* Intern referenced strucutre. */ | |
639 | if (attr->aspath) { | |
640 | if (!attr->aspath->refcnt) | |
641 | attr->aspath = aspath_intern(attr->aspath); | |
642 | else | |
643 | attr->aspath->refcnt++; | |
644 | } | |
645 | if (attr->community) { | |
646 | if (!attr->community->refcnt) | |
647 | attr->community = community_intern(attr->community); | |
648 | else | |
649 | attr->community->refcnt++; | |
650 | } | |
651 | ||
652 | if (attr->ecommunity) { | |
653 | if (!attr->ecommunity->refcnt) | |
654 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
655 | else | |
656 | attr->ecommunity->refcnt++; | |
657 | } | |
658 | if (attr->lcommunity) { | |
659 | if (!attr->lcommunity->refcnt) | |
660 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
661 | else | |
662 | attr->lcommunity->refcnt++; | |
663 | } | |
664 | if (attr->cluster) { | |
665 | if (!attr->cluster->refcnt) | |
666 | attr->cluster = cluster_intern(attr->cluster); | |
667 | else | |
668 | attr->cluster->refcnt++; | |
669 | } | |
670 | if (attr->transit) { | |
671 | if (!attr->transit->refcnt) | |
672 | attr->transit = transit_intern(attr->transit); | |
673 | else | |
674 | attr->transit->refcnt++; | |
675 | } | |
676 | if (attr->encap_subtlvs) { | |
677 | if (!attr->encap_subtlvs->refcnt) | |
678 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
679 | ENCAP_SUBTLV_TYPE); | |
680 | else | |
681 | attr->encap_subtlvs->refcnt++; | |
682 | } | |
bede7744 | 683 | #if ENABLE_BGP_VNC |
d62a17ae | 684 | if (attr->vnc_subtlvs) { |
685 | if (!attr->vnc_subtlvs->refcnt) | |
686 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
687 | VNC_SUBTLV_TYPE); | |
688 | else | |
689 | attr->vnc_subtlvs->refcnt++; | |
690 | } | |
aadc0905 | 691 | #endif |
bede7744 | 692 | |
dbbac180 DL |
693 | /* At this point, attr only contains intern'd pointers. that means |
694 | * if we find it in attrhash, it has all the same pointers and we | |
695 | * correctly updated the refcounts on these. | |
696 | * If we don't find it, we need to allocate a one because in all | |
697 | * cases this returns a new reference to a hashed attr, but the input | |
698 | * wasn't on hash. */ | |
d62a17ae | 699 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
700 | find->refcnt++; | |
701 | ||
702 | return find; | |
718e3744 | 703 | } |
704 | ||
705 | /* Make network statement's attribute. */ | |
d62a17ae | 706 | struct attr *bgp_attr_default_set(struct attr *attr, u_char origin) |
718e3744 | 707 | { |
d62a17ae | 708 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 709 | |
d62a17ae | 710 | attr->origin = origin; |
711 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
712 | attr->aspath = aspath_empty(); | |
713 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
714 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
715 | attr->tag = 0; | |
716 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
717 | attr->label = MPLS_INVALID_LABEL; | |
718 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
719 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
720 | ||
721 | return attr; | |
718e3744 | 722 | } |
723 | ||
b5d58c32 | 724 | /* Create the attributes for an aggregate */ |
d62a17ae | 725 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, u_char origin, |
726 | struct aspath *aspath, | |
727 | struct community *community, int as_set, | |
728 | u_char atomic_aggregate) | |
729 | { | |
730 | struct attr attr; | |
731 | struct attr *new; | |
732 | ||
733 | memset(&attr, 0, sizeof(struct attr)); | |
734 | ||
735 | /* Origin attribute. */ | |
736 | attr.origin = origin; | |
737 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
738 | ||
739 | /* AS path attribute. */ | |
740 | if (aspath) | |
741 | attr.aspath = aspath_intern(aspath); | |
742 | else | |
743 | attr.aspath = aspath_empty(); | |
744 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
745 | ||
746 | /* Next hop attribute. */ | |
747 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
748 | ||
749 | if (community) { | |
7f323236 DW |
750 | u_int32_t gshut = COMMUNITY_GSHUT; |
751 | ||
752 | /* If we are not shutting down ourselves and we are | |
753 | * aggregating a route that contains the GSHUT community we | |
754 | * need to remove that community when creating the aggregate */ | |
755 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) && | |
756 | community_include(community, gshut)) { | |
757 | community_del_val(community, &gshut); | |
758 | } | |
759 | ||
d62a17ae | 760 | attr.community = community; |
761 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
762 | } | |
763 | ||
7f323236 DW |
764 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { |
765 | bgp_attr_add_gshut_community(&attr); | |
766 | } | |
767 | ||
d62a17ae | 768 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
769 | attr.label = MPLS_INVALID_LABEL; | |
770 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
771 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
772 | if (!as_set || atomic_aggregate) | |
773 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
774 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
775 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
776 | attr.aggregator_as = bgp->confed_id; | |
777 | else | |
778 | attr.aggregator_as = bgp->as; | |
779 | attr.aggregator_addr = bgp->router_id; | |
780 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
781 | attr.label = MPLS_INVALID_LABEL; | |
782 | ||
783 | new = bgp_attr_intern(&attr); | |
784 | ||
785 | aspath_unintern(&new->aspath); | |
786 | return new; | |
718e3744 | 787 | } |
788 | ||
b881c707 | 789 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 790 | void bgp_attr_unintern_sub(struct attr *attr) |
791 | { | |
792 | /* aspath refcount shoud be decrement. */ | |
793 | if (attr->aspath) | |
794 | aspath_unintern(&attr->aspath); | |
795 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
796 | ||
797 | if (attr->community) | |
798 | community_unintern(&attr->community); | |
799 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
800 | ||
801 | if (attr->ecommunity) | |
802 | ecommunity_unintern(&attr->ecommunity); | |
803 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
804 | ||
805 | if (attr->lcommunity) | |
806 | lcommunity_unintern(&attr->lcommunity); | |
807 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
808 | ||
809 | if (attr->cluster) | |
810 | cluster_unintern(attr->cluster); | |
811 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
812 | ||
813 | if (attr->transit) | |
814 | transit_unintern(attr->transit); | |
815 | ||
816 | if (attr->encap_subtlvs) | |
817 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
818 | |
819 | #if ENABLE_BGP_VNC | |
d62a17ae | 820 | if (attr->vnc_subtlvs) |
821 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 822 | #endif |
b881c707 PJ |
823 | } |
824 | ||
718e3744 | 825 | /* Free bgp attribute and aspath. */ |
d62a17ae | 826 | void bgp_attr_unintern(struct attr **pattr) |
827 | { | |
828 | struct attr *attr = *pattr; | |
829 | struct attr *ret; | |
830 | struct attr tmp; | |
831 | ||
832 | /* Decrement attribute reference. */ | |
833 | attr->refcnt--; | |
834 | ||
835 | tmp = *attr; | |
836 | ||
837 | /* If reference becomes zero then free attribute object. */ | |
838 | if (attr->refcnt == 0) { | |
839 | ret = hash_release(attrhash, attr); | |
840 | assert(ret != NULL); | |
841 | XFREE(MTYPE_ATTR, attr); | |
842 | *pattr = NULL; | |
843 | } | |
844 | ||
845 | bgp_attr_unintern_sub(&tmp); | |
846 | } | |
847 | ||
848 | void bgp_attr_flush(struct attr *attr) | |
849 | { | |
850 | if (attr->aspath && !attr->aspath->refcnt) { | |
851 | aspath_free(attr->aspath); | |
852 | attr->aspath = NULL; | |
853 | } | |
854 | if (attr->community && !attr->community->refcnt) { | |
855 | community_free(attr->community); | |
856 | attr->community = NULL; | |
857 | } | |
858 | ||
859 | if (attr->ecommunity && !attr->ecommunity->refcnt) | |
860 | ecommunity_free(&attr->ecommunity); | |
861 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
862 | lcommunity_free(&attr->lcommunity); | |
863 | if (attr->cluster && !attr->cluster->refcnt) { | |
864 | cluster_free(attr->cluster); | |
865 | attr->cluster = NULL; | |
866 | } | |
867 | if (attr->transit && !attr->transit->refcnt) { | |
868 | transit_free(attr->transit); | |
869 | attr->transit = NULL; | |
870 | } | |
871 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
872 | encap_free(attr->encap_subtlvs); | |
873 | attr->encap_subtlvs = NULL; | |
874 | } | |
65efcfce | 875 | #if ENABLE_BGP_VNC |
d62a17ae | 876 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
877 | encap_free(attr->vnc_subtlvs); | |
878 | attr->vnc_subtlvs = NULL; | |
879 | } | |
aadc0905 | 880 | #endif |
718e3744 | 881 | } |
882 | ||
b881c707 PJ |
883 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
884 | * avoid resetting sessions for malformed attributes which are | |
885 | * are partial/optional and hence where the error likely was not | |
886 | * introduced by the sending neighbour. | |
887 | */ | |
888 | static bgp_attr_parse_ret_t | |
d62a17ae | 889 | bgp_attr_malformed(struct bgp_attr_parser_args *args, u_char subcode, |
890 | bgp_size_t length) | |
891 | { | |
892 | struct peer *const peer = args->peer; | |
893 | const u_int8_t flags = args->flags; | |
894 | /* startp and length must be special-cased, as whether or not to | |
895 | * send the attribute data with the NOTIFY depends on the error, | |
896 | * the caller therefore signals this with the seperate length argument | |
897 | */ | |
898 | u_char *notify_datap = (length > 0 ? args->startp : NULL); | |
899 | ||
900 | /* Only relax error handling for eBGP peers */ | |
901 | if (peer->sort != BGP_PEER_EBGP) { | |
902 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
903 | notify_datap, length); | |
904 | return BGP_ATTR_PARSE_ERROR; | |
905 | } | |
906 | ||
907 | /* Adjust the stream getp to the end of the attribute, in case we can | |
908 | * still proceed but the caller hasn't read all the attribute. | |
909 | */ | |
910 | stream_set_getp(BGP_INPUT(peer), | |
911 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
912 | + args->total); | |
913 | ||
914 | switch (args->type) { | |
915 | /* where an attribute is relatively inconsequential, e.g. it does not | |
916 | * affect route selection, and can be safely ignored, then any such | |
917 | * attributes which are malformed should just be ignored and the route | |
918 | * processed as normal. | |
919 | */ | |
920 | case BGP_ATTR_AS4_AGGREGATOR: | |
921 | case BGP_ATTR_AGGREGATOR: | |
922 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
923 | return BGP_ATTR_PARSE_PROCEED; | |
924 | ||
925 | /* Core attributes, particularly ones which may influence route | |
926 | * selection, should always cause session resets | |
927 | */ | |
928 | case BGP_ATTR_ORIGIN: | |
929 | case BGP_ATTR_AS_PATH: | |
930 | case BGP_ATTR_NEXT_HOP: | |
931 | case BGP_ATTR_MULTI_EXIT_DISC: | |
932 | case BGP_ATTR_LOCAL_PREF: | |
933 | case BGP_ATTR_COMMUNITIES: | |
934 | case BGP_ATTR_ORIGINATOR_ID: | |
935 | case BGP_ATTR_CLUSTER_LIST: | |
936 | case BGP_ATTR_MP_REACH_NLRI: | |
937 | case BGP_ATTR_MP_UNREACH_NLRI: | |
938 | case BGP_ATTR_EXT_COMMUNITIES: | |
939 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
940 | notify_datap, length); | |
941 | return BGP_ATTR_PARSE_ERROR; | |
942 | } | |
943 | ||
944 | /* Partial optional attributes that are malformed should not cause | |
945 | * the whole session to be reset. Instead treat it as a withdrawal | |
946 | * of the routes, if possible. | |
947 | */ | |
948 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
949 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
950 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
951 | return BGP_ATTR_PARSE_WITHDRAW; | |
952 | ||
953 | /* default to reset */ | |
954 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
955 | } |
956 | ||
afcb7679 DO |
957 | /* Find out what is wrong with the path attribute flag bits and log the error. |
958 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
959 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
960 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
961 | non-transitive" attribute. */ | |
962 | static void | |
d62a17ae | 963 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
964 | u_int8_t desired_flags /* how RFC says it must be */ | |
9d303b37 | 965 | ) |
d62a17ae | 966 | { |
967 | u_char seen = 0, i; | |
968 | u_char real_flags = args->flags; | |
969 | const u_int8_t attr_code = args->type; | |
970 | ||
971 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
972 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
973 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
974 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
975 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
976 | zlog_err("%s attribute must%s be flagged as \"%s\"", | |
977 | lookup_msg(attr_str, attr_code, NULL), | |
978 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
979 | ? "" | |
980 | : " not", | |
981 | attr_flag_str[i].str); | |
982 | seen = 1; | |
983 | } | |
984 | if (!seen) { | |
985 | zlog_debug( | |
986 | "Strange, %s called for attr %s, but no problem found with flags" | |
987 | " (real flags 0x%x, desired 0x%x)", | |
988 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
989 | real_flags, desired_flags); | |
990 | } | |
afcb7679 DO |
991 | } |
992 | ||
3ecab4c8 PJ |
993 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
994 | * as will PARTIAL for optional+transitive attributes. | |
995 | */ | |
d62a17ae | 996 | const u_int8_t attr_flags_values[] = { |
9d303b37 DL |
997 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, |
998 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
999 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1000 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1001 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1002 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1003 | [BGP_ATTR_AGGREGATOR] = | |
1004 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1005 | [BGP_ATTR_COMMUNITIES] = | |
1006 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1007 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1008 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1009 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1010 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1011 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1012 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1013 | [BGP_ATTR_AS4_PATH] = | |
1014 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1015 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1016 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1017 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1018 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1019 | [BGP_ATTR_PREFIX_SID] = | |
1020 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1021 | }; |
099111ef | 1022 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1023 | |
d62a17ae | 1024 | static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
1025 | { | |
1026 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
1027 | const u_int8_t flags = args->flags; | |
1028 | const u_int8_t attr_code = args->type; | |
1029 | ||
1030 | /* there may be attributes we don't know about */ | |
1031 | if (attr_code > attr_flags_values_max) | |
1032 | return 0; | |
1033 | if (attr_flags_values[attr_code] == 0) | |
1034 | return 0; | |
1035 | ||
1036 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1037 | * to | |
1038 | * 1." | |
1039 | */ | |
1040 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1041 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
1042 | zlog_err( | |
1043 | "%s well-known attributes must have transitive flag set (%x)", | |
1044 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1045 | return 1; | |
1046 | } | |
1047 | ||
1048 | /* "For well-known attributes and for optional non-transitive | |
1049 | * attributes, | |
1050 | * the Partial bit MUST be set to 0." | |
1051 | */ | |
1052 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1053 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
1054 | zlog_err( | |
1055 | "%s well-known attribute " | |
1056 | "must NOT have the partial flag set (%x)", | |
1057 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1058 | return 1; | |
1059 | } | |
1060 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1061 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
1062 | zlog_err( | |
1063 | "%s optional + transitive attribute " | |
1064 | "must NOT have the partial flag set (%x)", | |
1065 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1066 | return 1; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* Optional transitive attributes may go through speakers that don't | |
1071 | * reocgnise them and set the Partial bit. | |
1072 | */ | |
1073 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1074 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1075 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1076 | ||
1077 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1078 | return 0; | |
1079 | ||
1080 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1081 | return 1; | |
3ecab4c8 PJ |
1082 | } |
1083 | ||
718e3744 | 1084 | /* Get origin attribute of the update message. */ |
d62a17ae | 1085 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1086 | { | |
1087 | struct peer *const peer = args->peer; | |
1088 | struct attr *const attr = args->attr; | |
1089 | const bgp_size_t length = args->length; | |
1090 | ||
1091 | /* If any recognized attribute has Attribute Length that conflicts | |
1092 | with the expected length (based on the attribute type code), then | |
1093 | the Error Subcode is set to Attribute Length Error. The Data | |
1094 | field contains the erroneous attribute (type, length and | |
1095 | value). */ | |
1096 | if (length != 1) { | |
1097 | zlog_err("Origin attribute length is not one %d", length); | |
1098 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1099 | args->total); | |
1100 | } | |
1101 | ||
1102 | /* Fetch origin attribute. */ | |
1103 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1104 | ||
1105 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1106 | Subcode is set to Invalid Origin Attribute. The Data field | |
1107 | contains the unrecognized attribute (type, length and value). */ | |
1108 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1109 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
1110 | zlog_err("Origin attribute value is invalid %d", attr->origin); | |
1111 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
1112 | args->total); | |
1113 | } | |
1114 | ||
1115 | /* Set oring attribute flag. */ | |
1116 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1117 | ||
1118 | return 0; | |
718e3744 | 1119 | } |
ab005298 PJ |
1120 | |
1121 | /* Parse AS path information. This function is wrapper of | |
1122 | aspath_parse. */ | |
d62a17ae | 1123 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1124 | { | |
1125 | struct attr *const attr = args->attr; | |
1126 | struct peer *const peer = args->peer; | |
1127 | const bgp_size_t length = args->length; | |
1128 | ||
1129 | /* | |
1130 | * peer with AS4 => will get 4Byte ASnums | |
1131 | * otherwise, will get 16 Bit | |
1132 | */ | |
1133 | attr->aspath = aspath_parse(peer->ibuf, length, | |
1134 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); | |
1135 | ||
1136 | /* In case of IBGP, length will be zero. */ | |
1137 | if (!attr->aspath) { | |
1138 | zlog_err("Malformed AS path from %s, length is %d", peer->host, | |
1139 | length); | |
1140 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1141 | 0); | |
1142 | } | |
0b2aa3a0 | 1143 | |
d62a17ae | 1144 | /* Set aspath attribute flag. */ |
1145 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1146 | ||
1147 | return BGP_ATTR_PARSE_PROCEED; | |
1148 | } | |
1149 | ||
1150 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1151 | struct attr *const attr) | |
1152 | { | |
1153 | /* These checks were part of bgp_attr_aspath, but with | |
1154 | * as4 we should to check aspath things when | |
1155 | * aspath synthesizing with as4_path has already taken place. | |
1156 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1157 | * not right. | |
1158 | * So do the checks later, i.e. here | |
1159 | */ | |
1160 | struct bgp *bgp = peer->bgp; | |
1161 | struct aspath *aspath; | |
1162 | ||
1163 | /* Confederation sanity check. */ | |
1164 | if ((peer->sort == BGP_PEER_CONFED | |
1165 | && !aspath_left_confed_check(attr->aspath)) | |
1166 | || (peer->sort == BGP_PEER_EBGP | |
1167 | && aspath_confed_check(attr->aspath))) { | |
1168 | zlog_err("Malformed AS path from %s", peer->host); | |
1169 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1170 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1171 | return BGP_ATTR_PARSE_ERROR; | |
1172 | } | |
cddb8112 | 1173 | |
d62a17ae | 1174 | /* First AS check for EBGP. */ |
1175 | if (bgp != NULL && bgp_flag_check(bgp, BGP_FLAG_ENFORCE_FIRST_AS)) { | |
1176 | if (peer->sort == BGP_PEER_EBGP | |
1177 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
1178 | zlog_err("%s incorrect first AS (must be %u)", | |
1179 | peer->host, peer->as); | |
1180 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1181 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1182 | return BGP_ATTR_PARSE_ERROR; | |
1183 | } | |
1184 | } | |
0b2aa3a0 | 1185 | |
d62a17ae | 1186 | /* local-as prepend */ |
1187 | if (peer->change_local_as | |
1188 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1189 | aspath = aspath_dup(attr->aspath); | |
1190 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1191 | aspath_unintern(&attr->aspath); | |
1192 | attr->aspath = aspath_intern(aspath); | |
1193 | } | |
0b2aa3a0 | 1194 | |
d62a17ae | 1195 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1196 | } |
1197 | ||
ab005298 PJ |
1198 | /* Parse AS4 path information. This function is another wrapper of |
1199 | aspath_parse. */ | |
d62a17ae | 1200 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1201 | struct aspath **as4_path) | |
ab005298 | 1202 | { |
d62a17ae | 1203 | struct peer *const peer = args->peer; |
1204 | struct attr *const attr = args->attr; | |
1205 | const bgp_size_t length = args->length; | |
ab005298 | 1206 | |
d62a17ae | 1207 | *as4_path = aspath_parse(peer->ibuf, length, 1); |
b881c707 | 1208 | |
d62a17ae | 1209 | /* In case of IBGP, length will be zero. */ |
1210 | if (!*as4_path) { | |
1211 | zlog_err("Malformed AS4 path from %s, length is %d", peer->host, | |
1212 | length); | |
1213 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1214 | 0); | |
1215 | } | |
ab005298 | 1216 | |
d62a17ae | 1217 | /* Set aspath attribute flag. */ |
1218 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1219 | ||
1220 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1221 | } |
1222 | ||
718e3744 | 1223 | /* Nexthop attribute. */ |
d62a17ae | 1224 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1225 | { | |
1226 | struct peer *const peer = args->peer; | |
1227 | struct attr *const attr = args->attr; | |
1228 | const bgp_size_t length = args->length; | |
1229 | ||
1230 | in_addr_t nexthop_h, nexthop_n; | |
1231 | ||
1232 | /* Check nexthop attribute length. */ | |
1233 | if (length != 4) { | |
1234 | zlog_err("Nexthop attribute length isn't four [%d]", length); | |
1235 | ||
1236 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1237 | args->total); | |
1238 | } | |
1239 | ||
1240 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP | |
1241 | attribute must result in a NOTIFICATION message (this is implemented | |
1242 | below). | |
1243 | At the same time, semantically incorrect NEXT_HOP is more likely to | |
1244 | be just | |
1245 | logged locally (this is implemented somewhere else). The UPDATE | |
1246 | message | |
1247 | gets ignored in any of these cases. */ | |
1248 | nexthop_n = stream_get_ipv4(peer->ibuf); | |
1249 | nexthop_h = ntohl(nexthop_n); | |
1250 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1251 | || IPV4_CLASS_DE(nexthop_h)) | |
1252 | && !BGP_DEBUG( | |
1253 | allow_martians, | |
1254 | ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
1255 | { | |
1256 | char buf[INET_ADDRSTRLEN]; | |
1257 | inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); | |
1258 | zlog_err("Martian nexthop %s", buf); | |
1259 | return bgp_attr_malformed( | |
1260 | args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total); | |
1261 | } | |
1262 | ||
1263 | attr->nexthop.s_addr = nexthop_n; | |
1264 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1265 | ||
1266 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1267 | } |
1268 | ||
1269 | /* MED atrribute. */ | |
d62a17ae | 1270 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1271 | { |
d62a17ae | 1272 | struct peer *const peer = args->peer; |
1273 | struct attr *const attr = args->attr; | |
1274 | const bgp_size_t length = args->length; | |
b881c707 | 1275 | |
d62a17ae | 1276 | /* Length check. */ |
1277 | if (length != 4) { | |
1278 | zlog_err("MED attribute length isn't four [%d]", length); | |
718e3744 | 1279 | |
d62a17ae | 1280 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1281 | args->total); | |
1282 | } | |
1283 | ||
1284 | attr->med = stream_getl(peer->ibuf); | |
718e3744 | 1285 | |
d62a17ae | 1286 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1287 | |
d62a17ae | 1288 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1289 | } |
1290 | ||
1291 | /* Local preference attribute. */ | |
b881c707 | 1292 | static bgp_attr_parse_ret_t |
d62a17ae | 1293 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1294 | { | |
1295 | struct peer *const peer = args->peer; | |
1296 | struct attr *const attr = args->attr; | |
1297 | const bgp_size_t length = args->length; | |
1298 | ||
1299 | /* Length check. */ | |
1300 | if (length != 4) { | |
1301 | zlog_err("LOCAL_PREF attribute length isn't 4 [%u]", length); | |
1302 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1303 | args->total); | |
1304 | } | |
1305 | ||
1306 | /* If it is contained in an UPDATE message that is received from an | |
1307 | external peer, then this attribute MUST be ignored by the | |
1308 | receiving speaker. */ | |
1309 | if (peer->sort == BGP_PEER_EBGP) { | |
1310 | stream_forward_getp(peer->ibuf, length); | |
1311 | return BGP_ATTR_PARSE_PROCEED; | |
1312 | } | |
1313 | ||
1314 | attr->local_pref = stream_getl(peer->ibuf); | |
1315 | ||
7f323236 | 1316 | /* Set the local-pref flag. */ |
d62a17ae | 1317 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1318 | ||
1319 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1320 | } |
1321 | ||
1322 | /* Atomic aggregate. */ | |
d62a17ae | 1323 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1324 | { |
d62a17ae | 1325 | struct attr *const attr = args->attr; |
1326 | const bgp_size_t length = args->length; | |
1327 | ||
1328 | /* Length check. */ | |
1329 | if (length != 0) { | |
1330 | zlog_err("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", | |
1331 | length); | |
1332 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1333 | args->total); | |
1334 | } | |
718e3744 | 1335 | |
d62a17ae | 1336 | /* Set atomic aggregate flag. */ |
1337 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1338 | |
d62a17ae | 1339 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1340 | } |
1341 | ||
1342 | /* Aggregator attribute */ | |
d62a17ae | 1343 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1344 | { | |
1345 | struct peer *const peer = args->peer; | |
1346 | struct attr *const attr = args->attr; | |
1347 | const bgp_size_t length = args->length; | |
1348 | ||
1349 | int wantedlen = 6; | |
1350 | ||
1351 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1352 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1353 | wantedlen = 8; | |
1354 | ||
1355 | if (length != wantedlen) { | |
1356 | zlog_err("AGGREGATOR attribute length isn't %u [%u]", wantedlen, | |
1357 | length); | |
1358 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1359 | args->total); | |
1360 | } | |
1361 | ||
1362 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1363 | attr->aggregator_as = stream_getl(peer->ibuf); | |
1364 | else | |
1365 | attr->aggregator_as = stream_getw(peer->ibuf); | |
1366 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->ibuf); | |
1367 | ||
1368 | /* Set atomic aggregate flag. */ | |
1369 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1370 | ||
1371 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1372 | } |
1373 | ||
0b2aa3a0 | 1374 | /* New Aggregator attribute */ |
b881c707 | 1375 | static bgp_attr_parse_ret_t |
d62a17ae | 1376 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1377 | as_t *as4_aggregator_as, | |
1378 | struct in_addr *as4_aggregator_addr) | |
1379 | { | |
1380 | struct peer *const peer = args->peer; | |
1381 | struct attr *const attr = args->attr; | |
1382 | const bgp_size_t length = args->length; | |
1383 | ||
1384 | if (length != 8) { | |
1385 | zlog_err("New Aggregator length is not 8 [%d]", length); | |
1386 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1387 | 0); | |
1388 | } | |
1389 | ||
1390 | *as4_aggregator_as = stream_getl(peer->ibuf); | |
1391 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->ibuf); | |
1392 | ||
1393 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1394 | ||
1395 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1396 | } |
1397 | ||
1398 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1399 | */ | |
b881c707 | 1400 | static bgp_attr_parse_ret_t |
d62a17ae | 1401 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1402 | struct aspath *as4_path, as_t as4_aggregator, | |
1403 | struct in_addr *as4_aggregator_addr) | |
1404 | { | |
1405 | int ignore_as4_path = 0; | |
1406 | struct aspath *newpath; | |
1407 | ||
1408 | if (!attr->aspath) { | |
1409 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1410 | * have | |
1411 | * checked that all well-known, mandatory attributes were | |
1412 | * present. | |
1413 | * | |
1414 | * Can only be a problem with peer itself - hard error | |
1415 | */ | |
1416 | return BGP_ATTR_PARSE_ERROR; | |
1417 | } | |
1418 | ||
1419 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1420 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1421 | * if given. | |
1422 | * It is worth a warning though, because the peer really | |
1423 | * should not send them | |
1424 | */ | |
1425 | if (BGP_DEBUG(as4, AS4)) { | |
1426 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1427 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1428 | "AS4 capable peer, yet it sent"); | |
1429 | ||
1430 | if (attr->flag | |
1431 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1432 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1433 | peer->host, | |
1434 | "AS4 capable peer, yet it sent"); | |
1435 | } | |
1436 | ||
1437 | return BGP_ATTR_PARSE_PROCEED; | |
1438 | } | |
1439 | ||
1440 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1441 | * because that may override AS4_PATH | |
1442 | */ | |
1443 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1444 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1445 | /* received both. | |
1446 | * if the as_number in aggregator is not AS_TRANS, | |
1447 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1448 | * and the Aggregator shall be taken as | |
1449 | * info on the aggregating node, and the AS_PATH | |
1450 | * shall be taken as the AS_PATH | |
1451 | * otherwise | |
1452 | * the Aggregator shall be ignored and the | |
1453 | * AS4_AGGREGATOR shall be taken as the | |
1454 | * Aggregating node and the AS_PATH is to be | |
1455 | * constructed "as in all other cases" | |
1456 | */ | |
1457 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1458 | /* ignore */ | |
1459 | if (BGP_DEBUG(as4, AS4)) | |
1460 | zlog_debug( | |
1461 | "[AS4] %s BGP not AS4 capable peer" | |
1462 | " send AGGREGATOR != AS_TRANS and" | |
1463 | " AS4_AGGREGATOR, so ignore" | |
1464 | " AS4_AGGREGATOR and AS4_PATH", | |
1465 | peer->host); | |
1466 | ignore_as4_path = 1; | |
1467 | } else { | |
1468 | /* "New_aggregator shall be taken as aggregator" | |
1469 | */ | |
1470 | attr->aggregator_as = as4_aggregator; | |
1471 | attr->aggregator_addr.s_addr = | |
1472 | as4_aggregator_addr->s_addr; | |
1473 | } | |
1474 | } else { | |
1475 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1476 | * That is bogus - but reading the conditions | |
1477 | * we have to handle AS4_AGGREGATOR as if it were | |
1478 | * AGGREGATOR in that case | |
1479 | */ | |
1480 | if (BGP_DEBUG(as4, AS4)) | |
1481 | zlog_debug( | |
1482 | "[AS4] %s BGP not AS4 capable peer send" | |
1483 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1484 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1485 | peer->host); | |
1486 | attr->aggregator_as = as4_aggregator; | |
1487 | /* sweep it under the carpet and simulate a "good" | |
1488 | * AGGREGATOR */ | |
1489 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1494 | if (!ignore_as4_path | |
1495 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1496 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
1497 | aspath_unintern(&attr->aspath); | |
1498 | attr->aspath = aspath_intern(newpath); | |
1499 | } | |
1500 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1501 | } |
1502 | ||
718e3744 | 1503 | /* Community attribute. */ |
b881c707 | 1504 | static bgp_attr_parse_ret_t |
d62a17ae | 1505 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1506 | { | |
1507 | struct peer *const peer = args->peer; | |
1508 | struct attr *const attr = args->attr; | |
1509 | const bgp_size_t length = args->length; | |
1510 | ||
1511 | if (length == 0) { | |
1512 | attr->community = NULL; | |
1513 | return BGP_ATTR_PARSE_PROCEED; | |
1514 | } | |
1515 | ||
1516 | attr->community = | |
1517 | community_parse((u_int32_t *)stream_pnt(peer->ibuf), length); | |
1518 | ||
1519 | /* XXX: fix community_parse to use stream API and remove this */ | |
1520 | stream_forward_getp(peer->ibuf, length); | |
1521 | ||
1522 | if (!attr->community) | |
1523 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1524 | args->total); | |
1525 | ||
1526 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1527 | ||
1528 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1529 | } |
1530 | ||
1531 | /* Originator ID attribute. */ | |
b881c707 | 1532 | static bgp_attr_parse_ret_t |
d62a17ae | 1533 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1534 | { |
d62a17ae | 1535 | struct peer *const peer = args->peer; |
1536 | struct attr *const attr = args->attr; | |
1537 | const bgp_size_t length = args->length; | |
718e3744 | 1538 | |
d62a17ae | 1539 | /* Length check. */ |
1540 | if (length != 4) { | |
1541 | zlog_err("Bad originator ID length %d", length); | |
718e3744 | 1542 | |
d62a17ae | 1543 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1544 | args->total); | |
1545 | } | |
1546 | ||
1547 | attr->originator_id.s_addr = stream_get_ipv4(peer->ibuf); | |
718e3744 | 1548 | |
d62a17ae | 1549 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1550 | |
d62a17ae | 1551 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1552 | } |
1553 | ||
1554 | /* Cluster list attribute. */ | |
b881c707 | 1555 | static bgp_attr_parse_ret_t |
d62a17ae | 1556 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1557 | { |
d62a17ae | 1558 | struct peer *const peer = args->peer; |
1559 | struct attr *const attr = args->attr; | |
1560 | const bgp_size_t length = args->length; | |
1561 | ||
1562 | /* Check length. */ | |
1563 | if (length % 4) { | |
1564 | zlog_err("Bad cluster list length %d", length); | |
718e3744 | 1565 | |
d62a17ae | 1566 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1567 | args->total); | |
1568 | } | |
1569 | ||
1570 | attr->cluster = | |
1571 | cluster_parse((struct in_addr *)stream_pnt(peer->ibuf), length); | |
718e3744 | 1572 | |
d62a17ae | 1573 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
1574 | stream_forward_getp(peer->ibuf, length); | |
718e3744 | 1575 | |
d62a17ae | 1576 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1577 | |
d62a17ae | 1578 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1579 | } |
1580 | ||
1581 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1582 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1583 | struct bgp_nlri *mp_update) | |
1584 | { | |
1585 | iana_afi_t pkt_afi; | |
1586 | afi_t afi; | |
5c525538 RW |
1587 | iana_safi_t pkt_safi; |
1588 | safi_t safi; | |
d62a17ae | 1589 | bgp_size_t nlri_len; |
1590 | size_t start; | |
1591 | struct stream *s; | |
1592 | struct peer *const peer = args->peer; | |
1593 | struct attr *const attr = args->attr; | |
1594 | const bgp_size_t length = args->length; | |
1595 | ||
1596 | /* Set end of packet. */ | |
1597 | s = BGP_INPUT(peer); | |
1598 | start = stream_get_getp(s); | |
1599 | ||
1600 | /* safe to read statically sized header? */ | |
6e4ab12f | 1601 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1602 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1603 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
1604 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1605 | peer->host, (unsigned long)length); | |
1606 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1607 | } | |
1608 | ||
1609 | /* Load AFI, SAFI. */ | |
1610 | pkt_afi = stream_getw(s); | |
1611 | pkt_safi = stream_getc(s); | |
1612 | ||
1613 | /* Convert AFI, SAFI to internal values, check. */ | |
1614 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1615 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1616 | * unless | |
1617 | * the attribute is otherwise malformed. | |
1618 | */ | |
1619 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1620 | zlog_debug( | |
1621 | "%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1622 | peer->host, pkt_afi, pkt_safi); | |
1623 | return BGP_ATTR_PARSE_ERROR; | |
1624 | } | |
1625 | ||
1626 | /* Get nexthop length. */ | |
1627 | attr->mp_nexthop_len = stream_getc(s); | |
1628 | ||
1629 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1630 | zlog_info( | |
1631 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1632 | __func__, peer->host, attr->mp_nexthop_len); | |
1633 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1634 | } | |
1635 | ||
1636 | /* Nexthop length check. */ | |
1637 | switch (attr->mp_nexthop_len) { | |
1638 | case BGP_ATTR_NHLEN_IPV4: | |
1639 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1640 | /* Probably needed for RFC 2283 */ | |
1641 | if (attr->nexthop.s_addr == 0) | |
1642 | memcpy(&attr->nexthop.s_addr, | |
1643 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1644 | break; | |
1645 | case BGP_ATTR_NHLEN_VPNV4: | |
1646 | stream_getl(s); /* RD high */ | |
1647 | stream_getl(s); /* RD low */ | |
1648 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1649 | break; | |
1650 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: | |
1651 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1652 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1653 | stream_getl(s); /* RD high */ | |
1654 | stream_getl(s); /* RD low */ | |
1655 | } | |
1656 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1657 | break; | |
1658 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1659 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1660 | if (attr->mp_nexthop_len | |
1661 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1662 | stream_getl(s); /* RD high */ | |
1663 | stream_getl(s); /* RD low */ | |
1664 | } | |
1665 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1666 | if (attr->mp_nexthop_len | |
1667 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1668 | stream_getl(s); /* RD high */ | |
1669 | stream_getl(s); /* RD low */ | |
1670 | } | |
1671 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1672 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1673 | char buf1[INET6_ADDRSTRLEN]; | |
1674 | char buf2[INET6_ADDRSTRLEN]; | |
1675 | ||
1676 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1677 | zlog_debug( | |
1678 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1679 | peer->host, | |
1680 | inet_ntop(AF_INET6, | |
1681 | &attr->mp_nexthop_global, | |
1682 | buf1, INET6_ADDRSTRLEN), | |
1683 | inet_ntop(AF_INET6, | |
1684 | &attr->mp_nexthop_local, buf2, | |
1685 | INET6_ADDRSTRLEN)); | |
1686 | ||
1687 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1688 | } | |
1689 | break; | |
1690 | default: | |
1691 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1692 | __func__, peer->host, attr->mp_nexthop_len); | |
1693 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1694 | } | |
1695 | ||
1696 | if (!LEN_LEFT) { | |
1697 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1698 | peer->host); | |
1699 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1700 | } | |
1701 | ||
718e3744 | 1702 | { |
d62a17ae | 1703 | u_char val; |
1704 | if ((val = stream_getc(s))) | |
1705 | zlog_warn( | |
1706 | "%s sent non-zero value, %u, for defunct SNPA-length field", | |
1707 | peer->host, val); | |
1708 | } | |
1709 | ||
1710 | /* must have nrli_len, what is left of the attribute */ | |
1711 | nlri_len = LEN_LEFT; | |
1712 | if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) { | |
1713 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); | |
1714 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1715 | } | |
1716 | ||
1717 | mp_update->afi = afi; | |
1718 | mp_update->safi = safi; | |
1719 | mp_update->nlri = stream_pnt(s); | |
1720 | mp_update->length = nlri_len; | |
1721 | ||
1722 | stream_forward_getp(s, nlri_len); | |
1723 | ||
1724 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1725 | ||
1726 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 1727 | #undef LEN_LEFT |
718e3744 | 1728 | } |
1729 | ||
1730 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 1731 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
1732 | struct bgp_nlri *mp_withdraw) | |
1733 | { | |
1734 | struct stream *s; | |
1735 | iana_afi_t pkt_afi; | |
1736 | afi_t afi; | |
5c525538 RW |
1737 | iana_safi_t pkt_safi; |
1738 | safi_t safi; | |
d62a17ae | 1739 | u_int16_t withdraw_len; |
1740 | struct peer *const peer = args->peer; | |
1741 | struct attr *const attr = args->attr; | |
1742 | const bgp_size_t length = args->length; | |
9cabb64b | 1743 | |
d62a17ae | 1744 | s = peer->ibuf; |
9cabb64b | 1745 | |
d62a17ae | 1746 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
1747 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1748 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1749 | ||
1750 | pkt_afi = stream_getw(s); | |
1751 | pkt_safi = stream_getc(s); | |
1752 | ||
1753 | /* Convert AFI, SAFI to internal values, check. */ | |
1754 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1755 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1756 | * unless | |
1757 | * the attribute is otherwise malformed. | |
1758 | */ | |
1759 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1760 | zlog_debug( | |
1761 | "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1762 | peer->host, pkt_afi, pkt_safi); | |
1763 | return BGP_ATTR_PARSE_ERROR; | |
1764 | } | |
718e3744 | 1765 | |
d62a17ae | 1766 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1767 | |
d62a17ae | 1768 | mp_withdraw->afi = afi; |
1769 | mp_withdraw->safi = safi; | |
1770 | mp_withdraw->nlri = stream_pnt(s); | |
1771 | mp_withdraw->length = withdraw_len; | |
718e3744 | 1772 | |
d62a17ae | 1773 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 1774 | |
d62a17ae | 1775 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
1776 | ||
1777 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1778 | } |
1779 | ||
57d187bc JS |
1780 | /* Large Community attribute. */ |
1781 | static bgp_attr_parse_ret_t | |
d62a17ae | 1782 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
1783 | { | |
1784 | struct peer *const peer = args->peer; | |
1785 | struct attr *const attr = args->attr; | |
1786 | const bgp_size_t length = args->length; | |
1787 | ||
1788 | /* | |
1789 | * Large community follows new attribute format. | |
1790 | */ | |
1791 | if (length == 0) { | |
1792 | attr->lcommunity = NULL; | |
1793 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1794 | return BGP_ATTR_PARSE_PROCEED; | |
1795 | } | |
57d187bc | 1796 | |
d62a17ae | 1797 | attr->lcommunity = |
1798 | lcommunity_parse((u_int8_t *)stream_pnt(peer->ibuf), length); | |
1799 | /* XXX: fix ecommunity_parse to use stream API */ | |
1800 | stream_forward_getp(peer->ibuf, length); | |
57d187bc | 1801 | |
d62a17ae | 1802 | if (!attr->lcommunity) |
1803 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1804 | args->total); | |
57d187bc | 1805 | |
d62a17ae | 1806 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 1807 | |
d62a17ae | 1808 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
1809 | } |
1810 | ||
718e3744 | 1811 | /* Extended Community attribute. */ |
b881c707 | 1812 | static bgp_attr_parse_ret_t |
d62a17ae | 1813 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
1814 | { | |
1815 | struct peer *const peer = args->peer; | |
1816 | struct attr *const attr = args->attr; | |
1817 | const bgp_size_t length = args->length; | |
1818 | u_char sticky = 0; | |
1819 | ||
1820 | if (length == 0) { | |
1821 | attr->ecommunity = NULL; | |
1822 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1823 | return BGP_ATTR_PARSE_PROCEED; | |
1824 | } | |
1825 | ||
1826 | attr->ecommunity = | |
1827 | ecommunity_parse((u_int8_t *)stream_pnt(peer->ibuf), length); | |
1828 | /* XXX: fix ecommunity_parse to use stream API */ | |
1829 | stream_forward_getp(peer->ibuf, length); | |
1830 | ||
1831 | if (!attr->ecommunity) | |
1832 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1833 | args->total); | |
1834 | ||
1835 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1836 | ||
1837 | /* Extract MAC mobility sequence number, if any. */ | |
1838 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1839 | attr->sticky = sticky; | |
1840 | ||
1841 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1842 | } |
1843 | ||
f4c89855 | 1844 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 1845 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
1846 | bgp_size_t length, /* IN: attr's length field */ | |
1847 | struct attr *attr, /* IN: caller already allocated */ | |
1848 | u_char flag, /* IN: attr's flags field */ | |
1849 | u_char *startp) | |
1850 | { | |
1851 | bgp_size_t total; | |
d62a17ae | 1852 | uint16_t tunneltype = 0; |
1853 | ||
1854 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1855 | ||
1856 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1857 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1858 | zlog_info( | |
1859 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1860 | flag); | |
1861 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1862 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1863 | startp, total); | |
1864 | return -1; | |
1865 | } | |
1866 | ||
1867 | if (BGP_ATTR_ENCAP == type) { | |
1868 | /* read outer TLV type and length */ | |
1869 | uint16_t tlv_length; | |
1870 | ||
1871 | if (length < 4) { | |
1872 | zlog_info( | |
1873 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1874 | bgp_notify_send_with_data( | |
1875 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1876 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1877 | return -1; | |
1878 | } | |
1879 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
1880 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
1881 | length -= 4; | |
1882 | ||
1883 | if (tlv_length != length) { | |
1884 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
1885 | tlv_length, length); | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | while (length >= 4) { | |
1890 | uint16_t subtype = 0; | |
1891 | uint16_t sublength = 0; | |
1892 | struct bgp_attr_encap_subtlv *tlv; | |
1893 | ||
1894 | if (BGP_ATTR_ENCAP == type) { | |
1895 | subtype = stream_getc(BGP_INPUT(peer)); | |
1896 | sublength = stream_getc(BGP_INPUT(peer)); | |
1897 | length -= 2; | |
65efcfce | 1898 | #if ENABLE_BGP_VNC |
d62a17ae | 1899 | } else { |
1900 | subtype = stream_getw(BGP_INPUT(peer)); | |
1901 | sublength = stream_getw(BGP_INPUT(peer)); | |
1902 | length -= 4; | |
65efcfce | 1903 | #endif |
d62a17ae | 1904 | } |
1905 | ||
1906 | if (sublength > length) { | |
1907 | zlog_info( | |
1908 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
1909 | sublength, length); | |
1910 | bgp_notify_send_with_data( | |
1911 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1912 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1913 | return -1; | |
1914 | } | |
1915 | ||
1916 | /* alloc and copy sub-tlv */ | |
1917 | /* TBD make sure these are freed when attributes are released */ | |
1918 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
12f70478 | 1919 | sizeof(struct bgp_attr_encap_subtlv) |
d62a17ae | 1920 | + sublength); |
1921 | tlv->type = subtype; | |
1922 | tlv->length = sublength; | |
1923 | stream_get(tlv->value, peer->ibuf, sublength); | |
1924 | length -= sublength; | |
1925 | ||
1926 | /* attach tlv to encap chain */ | |
1927 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 1928 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1929 | for (stlv_last = attr->encap_subtlvs; |
1930 | stlv_last && stlv_last->next; | |
1931 | stlv_last = stlv_last->next) | |
1932 | ; | |
1933 | if (stlv_last) { | |
1934 | stlv_last->next = tlv; | |
1935 | } else { | |
1936 | attr->encap_subtlvs = tlv; | |
1937 | } | |
65efcfce | 1938 | #if ENABLE_BGP_VNC |
d62a17ae | 1939 | } else { |
e4002056 | 1940 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1941 | for (stlv_last = attr->vnc_subtlvs; |
1942 | stlv_last && stlv_last->next; | |
1943 | stlv_last = stlv_last->next) | |
1944 | ; | |
1945 | if (stlv_last) { | |
1946 | stlv_last->next = tlv; | |
1947 | } else { | |
1948 | attr->vnc_subtlvs = tlv; | |
1949 | } | |
aadc0905 | 1950 | #endif |
d62a17ae | 1951 | } |
d62a17ae | 1952 | } |
f4c89855 | 1953 | |
d62a17ae | 1954 | if (BGP_ATTR_ENCAP == type) { |
1955 | attr->encap_tunneltype = tunneltype; | |
1956 | } | |
f4c89855 | 1957 | |
d62a17ae | 1958 | if (length) { |
1959 | /* spurious leftover data */ | |
1960 | zlog_info( | |
1961 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
1962 | length); | |
1963 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1964 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1965 | startp, total); | |
1966 | return -1; | |
1967 | } | |
f4c89855 | 1968 | |
d62a17ae | 1969 | return 0; |
f4c89855 LB |
1970 | } |
1971 | ||
c5a543b4 DW |
1972 | /* Prefix SID attribute |
1973 | * draft-ietf-idr-bgp-prefix-sid-05 | |
1974 | */ | |
6cf48acc | 1975 | static bgp_attr_parse_ret_t |
d62a17ae | 1976 | bgp_attr_prefix_sid(struct bgp_attr_parser_args *args, |
1977 | struct bgp_nlri *mp_update) | |
1978 | { | |
1979 | struct peer *const peer = args->peer; | |
1980 | struct attr *const attr = args->attr; | |
1981 | int type; | |
1982 | int length; | |
1983 | u_int32_t label_index; | |
1984 | struct in6_addr ipv6_sid; | |
1985 | u_int32_t srgb_base; | |
1986 | u_int32_t srgb_range; | |
1987 | int srgb_count; | |
1988 | ||
1989 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
1990 | ||
1991 | type = stream_getc(peer->ibuf); | |
1992 | length = stream_getw(peer->ibuf); | |
1993 | ||
1994 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { | |
1995 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
1996 | zlog_err( | |
1997 | "Prefix SID label index length is %d instead of %d", | |
1998 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
1999 | return bgp_attr_malformed( | |
2000 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2001 | args->total); | |
2002 | } | |
2003 | ||
2004 | /* Ignore flags and reserved */ | |
2005 | stream_getc(peer->ibuf); | |
2006 | stream_getw(peer->ibuf); | |
2007 | ||
2008 | /* Fetch the label index and see if it is valid. */ | |
2009 | label_index = stream_getl(peer->ibuf); | |
2010 | if (label_index == BGP_INVALID_LABEL_INDEX) | |
2011 | return bgp_attr_malformed( | |
2012 | args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2013 | args->total); | |
2014 | ||
2015 | /* Store label index; subsequently, we'll check on | |
2016 | * address-family */ | |
2017 | attr->label_index = label_index; | |
2018 | ||
2019 | /* | |
2020 | * Ignore the Label index attribute unless received for | |
2021 | * labeled-unicast | |
2022 | * SAFI. | |
2023 | */ | |
2024 | if (!mp_update->length | |
2025 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2026 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2027 | } | |
2028 | ||
2029 | /* Placeholder code for the IPv6 SID type */ | |
2030 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2031 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
2032 | zlog_err("Prefix SID IPv6 length is %d instead of %d", | |
2033 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
2034 | return bgp_attr_malformed( | |
2035 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2036 | args->total); | |
2037 | } | |
2038 | ||
2039 | /* Ignore reserved */ | |
2040 | stream_getc(peer->ibuf); | |
2041 | stream_getw(peer->ibuf); | |
2042 | ||
2043 | stream_get(&ipv6_sid, peer->ibuf, 16); | |
2044 | } | |
2045 | ||
2046 | /* Placeholder code for the Originator SRGB type */ | |
2047 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2048 | /* Ignore flags */ | |
2049 | stream_getw(peer->ibuf); | |
2050 | ||
2051 | length -= 2; | |
2052 | ||
2053 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
2054 | zlog_err( | |
2055 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", | |
2056 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2057 | return bgp_attr_malformed( | |
2058 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2059 | args->total); | |
2060 | } | |
2061 | ||
2062 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2063 | ||
2064 | for (int i = 0; i < srgb_count; i++) { | |
2065 | stream_get(&srgb_base, peer->ibuf, 3); | |
2066 | stream_get(&srgb_range, peer->ibuf, 3); | |
2067 | } | |
2068 | } | |
2069 | ||
2070 | return BGP_ATTR_PARSE_PROCEED; | |
6cf48acc VV |
2071 | } |
2072 | ||
718e3744 | 2073 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2074 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2075 | { | |
2076 | bgp_size_t total = args->total; | |
2077 | struct transit *transit; | |
2078 | struct peer *const peer = args->peer; | |
2079 | struct attr *const attr = args->attr; | |
2080 | u_char *const startp = args->startp; | |
2081 | const u_char type = args->type; | |
2082 | const u_char flag = args->flags; | |
2083 | const bgp_size_t length = args->length; | |
2084 | ||
2085 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2086 | zlog_debug( | |
2087 | "%s Unknown attribute is received (type %d, length %d)", | |
2088 | peer->host, type, length); | |
2089 | ||
2090 | /* Forward read pointer of input stream. */ | |
2091 | stream_forward_getp(peer->ibuf, length); | |
2092 | ||
2093 | /* If any of the mandatory well-known attributes are not recognized, | |
2094 | then the Error Subcode is set to Unrecognized Well-known | |
2095 | Attribute. The Data field contains the unrecognized attribute | |
2096 | (type, length and value). */ | |
2097 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2098 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2099 | args->total); | |
2100 | } | |
2101 | ||
2102 | /* Unrecognized non-transitive optional attributes must be quietly | |
2103 | ignored and not passed along to other BGP peers. */ | |
2104 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2105 | return BGP_ATTR_PARSE_PROCEED; | |
2106 | ||
2107 | /* If a path with recognized transitive optional attribute is | |
2108 | accepted and passed along to other BGP peers and the Partial bit | |
2109 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2110 | is not set back to 0 by the current AS. */ | |
2111 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2112 | ||
2113 | /* Store transitive attribute to the end of attr->transit. */ | |
2114 | if (!attr->transit) | |
2115 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2116 | ||
2117 | transit = attr->transit; | |
2118 | ||
2119 | if (transit->val) | |
2120 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2121 | transit->length + total); | |
2122 | else | |
2123 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2124 | ||
2125 | memcpy(transit->val + transit->length, startp, total); | |
2126 | transit->length += total; | |
2127 | ||
2128 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2129 | } |
2130 | ||
bb7bef14 | 2131 | /* Well-known attribute check. */ |
d62a17ae | 2132 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2133 | { | |
2134 | u_char type = 0; | |
2135 | ||
2136 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2137 | * empty UPDATE. */ | |
2138 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2139 | return BGP_ATTR_PARSE_PROCEED; | |
2140 | ||
2141 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2142 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2143 | are present, it should. Check for any other attribute being present | |
2144 | instead. | |
2145 | */ | |
2146 | if (attr->flag == ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)) | |
2147 | return BGP_ATTR_PARSE_PROCEED; | |
2148 | ||
2149 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2150 | type = BGP_ATTR_ORIGIN; | |
2151 | ||
2152 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2153 | type = BGP_ATTR_AS_PATH; | |
2154 | ||
2155 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2156 | * and | |
2157 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2158 | */ | |
2159 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2160 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2161 | type = BGP_ATTR_NEXT_HOP; | |
2162 | ||
2163 | if (peer->sort == BGP_PEER_IBGP | |
2164 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2165 | type = BGP_ATTR_LOCAL_PREF; | |
2166 | ||
2167 | if (type) { | |
2168 | zlog_warn("%s Missing well-known attribute %s.", peer->host, | |
2169 | lookup_msg(attr_str, type, NULL)); | |
2170 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2171 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2172 | 1); | |
2173 | return BGP_ATTR_PARSE_ERROR; | |
2174 | } | |
2175 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2176 | } |
2177 | ||
718e3744 | 2178 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2179 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2180 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2181 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2182 | struct bgp_nlri *mp_withdraw) | |
2183 | { | |
2184 | int ret; | |
2185 | u_char flag = 0; | |
2186 | u_char type = 0; | |
2187 | bgp_size_t length; | |
2188 | u_char *startp, *endp; | |
2189 | u_char *attr_endp; | |
2190 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
2191 | /* we need the as4_path only until we have synthesized the as_path with | |
2192 | * it */ | |
2193 | /* same goes for as4_aggregator */ | |
2194 | struct aspath *as4_path = NULL; | |
2195 | as_t as4_aggregator = 0; | |
2196 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2197 | ||
2198 | /* Initialize bitmap. */ | |
2199 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2200 | ||
2201 | /* End pointer of BGP attribute. */ | |
2202 | endp = BGP_INPUT_PNT(peer) + size; | |
2203 | ||
2204 | /* Get attributes to the end of attribute length. */ | |
2205 | while (BGP_INPUT_PNT(peer) < endp) { | |
2206 | /* Check remaining length check.*/ | |
2207 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2208 | /* XXX warning: long int format, int arg (arg 5) */ | |
2209 | zlog_warn( | |
2210 | "%s: error BGP attribute length %lu is smaller than min len", | |
2211 | peer->host, | |
2212 | (unsigned long)(endp | |
2213 | - STREAM_PNT(BGP_INPUT(peer)))); | |
2214 | ||
2215 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2216 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2217 | return BGP_ATTR_PARSE_ERROR; | |
2218 | } | |
718e3744 | 2219 | |
d62a17ae | 2220 | /* Fetch attribute flag and type. */ |
2221 | startp = BGP_INPUT_PNT(peer); | |
2222 | /* "The lower-order four bits of the Attribute Flags octet are | |
2223 | unused. They MUST be zero when sent and MUST be ignored when | |
2224 | received." */ | |
2225 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2226 | type = stream_getc(BGP_INPUT(peer)); | |
2227 | ||
2228 | /* Check whether Extended-Length applies and is in bounds */ | |
2229 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2230 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
2231 | zlog_warn( | |
2232 | "%s: Extended length set, but just %lu bytes of attr header", | |
2233 | peer->host, | |
2234 | (unsigned long)(endp | |
2235 | - STREAM_PNT(BGP_INPUT(peer)))); | |
2236 | ||
2237 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2238 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2239 | return BGP_ATTR_PARSE_ERROR; | |
2240 | } | |
718e3744 | 2241 | |
d62a17ae | 2242 | /* Check extended attribue length bit. */ |
2243 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2244 | length = stream_getw(BGP_INPUT(peer)); | |
2245 | else | |
2246 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2247 | |
d62a17ae | 2248 | /* If any attribute appears more than once in the UPDATE |
2249 | message, then the Error Subcode is set to Malformed Attribute | |
2250 | List. */ | |
718e3744 | 2251 | |
d62a17ae | 2252 | if (CHECK_BITMAP(seen, type)) { |
2253 | zlog_warn( | |
2254 | "%s: error BGP attribute type %d appears twice in a message", | |
2255 | peer->host, type); | |
718e3744 | 2256 | |
d62a17ae | 2257 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2258 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2259 | return BGP_ATTR_PARSE_ERROR; | |
2260 | } | |
2261 | ||
2262 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2263 | unsigned char so it never overflow bitmap range. */ | |
2264 | ||
2265 | SET_BITMAP(seen, type); | |
2266 | ||
2267 | /* Overflow check. */ | |
2268 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2269 | ||
2270 | if (attr_endp > endp) { | |
2271 | zlog_warn( | |
2272 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", | |
2273 | peer->host, type, length, size, attr_endp, | |
2274 | endp); | |
2275 | bgp_notify_send_with_data( | |
2276 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2277 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, startp, | |
2278 | attr_endp - startp); | |
2279 | return BGP_ATTR_PARSE_ERROR; | |
2280 | } | |
2281 | ||
2282 | struct bgp_attr_parser_args attr_args = { | |
2283 | .peer = peer, | |
2284 | .length = length, | |
2285 | .attr = attr, | |
2286 | .type = type, | |
2287 | .flags = flag, | |
2288 | .startp = startp, | |
2289 | .total = attr_endp - startp, | |
2290 | }; | |
2291 | ||
2292 | ||
2293 | /* If any recognized attribute has Attribute Flags that conflict | |
2294 | with the Attribute Type Code, then the Error Subcode is set | |
2295 | to | |
2296 | Attribute Flags Error. The Data field contains the erroneous | |
2297 | attribute (type, length and value). */ | |
2298 | if (bgp_attr_flag_invalid(&attr_args)) { | |
2299 | bgp_attr_parse_ret_t ret; | |
2300 | ret = bgp_attr_malformed( | |
2301 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2302 | attr_args.total); | |
2303 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2304 | continue; | |
2305 | return ret; | |
2306 | } | |
2307 | ||
2308 | /* OK check attribute and store it's value. */ | |
2309 | switch (type) { | |
2310 | case BGP_ATTR_ORIGIN: | |
2311 | ret = bgp_attr_origin(&attr_args); | |
2312 | break; | |
2313 | case BGP_ATTR_AS_PATH: | |
2314 | ret = bgp_attr_aspath(&attr_args); | |
2315 | break; | |
2316 | case BGP_ATTR_AS4_PATH: | |
2317 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2318 | break; | |
2319 | case BGP_ATTR_NEXT_HOP: | |
2320 | ret = bgp_attr_nexthop(&attr_args); | |
2321 | break; | |
2322 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2323 | ret = bgp_attr_med(&attr_args); | |
2324 | break; | |
2325 | case BGP_ATTR_LOCAL_PREF: | |
2326 | ret = bgp_attr_local_pref(&attr_args); | |
2327 | break; | |
2328 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2329 | ret = bgp_attr_atomic(&attr_args); | |
2330 | break; | |
2331 | case BGP_ATTR_AGGREGATOR: | |
2332 | ret = bgp_attr_aggregator(&attr_args); | |
2333 | break; | |
2334 | case BGP_ATTR_AS4_AGGREGATOR: | |
2335 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2336 | &as4_aggregator, | |
2337 | &as4_aggregator_addr); | |
2338 | break; | |
2339 | case BGP_ATTR_COMMUNITIES: | |
2340 | ret = bgp_attr_community(&attr_args); | |
2341 | break; | |
2342 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2343 | ret = bgp_attr_large_community(&attr_args); | |
2344 | break; | |
2345 | case BGP_ATTR_ORIGINATOR_ID: | |
2346 | ret = bgp_attr_originator_id(&attr_args); | |
2347 | break; | |
2348 | case BGP_ATTR_CLUSTER_LIST: | |
2349 | ret = bgp_attr_cluster_list(&attr_args); | |
2350 | break; | |
2351 | case BGP_ATTR_MP_REACH_NLRI: | |
2352 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2353 | break; | |
2354 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2355 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2356 | break; | |
2357 | case BGP_ATTR_EXT_COMMUNITIES: | |
2358 | ret = bgp_attr_ext_communities(&attr_args); | |
2359 | break; | |
65efcfce | 2360 | #if ENABLE_BGP_VNC |
d62a17ae | 2361 | case BGP_ATTR_VNC: |
65efcfce | 2362 | #endif |
d62a17ae | 2363 | case BGP_ATTR_ENCAP: |
2364 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2365 | startp); | |
2366 | break; | |
2367 | case BGP_ATTR_PREFIX_SID: | |
2368 | ret = bgp_attr_prefix_sid(&attr_args, mp_update); | |
2369 | break; | |
2370 | default: | |
2371 | ret = bgp_attr_unknown(&attr_args); | |
2372 | break; | |
2373 | } | |
2374 | ||
2375 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2376 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2377 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2378 | ret = BGP_ATTR_PARSE_ERROR; | |
2379 | } | |
2380 | ||
2381 | /* If hard error occured immediately return to the caller. */ | |
2382 | if (ret == BGP_ATTR_PARSE_ERROR) { | |
2383 | zlog_warn("%s: Attribute %s, parse error", peer->host, | |
2384 | lookup_msg(attr_str, type, NULL)); | |
2385 | if (as4_path) | |
2386 | aspath_unintern(&as4_path); | |
2387 | return ret; | |
2388 | } | |
2389 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2390 | ||
2391 | zlog_warn( | |
2392 | "%s: Attribute %s, parse error - treating as withdrawal", | |
2393 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2394 | if (as4_path) | |
2395 | aspath_unintern(&as4_path); | |
2396 | return ret; | |
2397 | } | |
2398 | ||
2399 | /* Check the fetched length. */ | |
2400 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
2401 | zlog_warn("%s: BGP attribute %s, fetch error", | |
2402 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2403 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2404 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2405 | if (as4_path) | |
2406 | aspath_unintern(&as4_path); | |
2407 | return BGP_ATTR_PARSE_ERROR; | |
2408 | } | |
718e3744 | 2409 | } |
d62a17ae | 2410 | |
2411 | /* Check final read pointer is same as end pointer. */ | |
2412 | if (BGP_INPUT_PNT(peer) != endp) { | |
2413 | zlog_warn("%s: BGP attribute %s, length mismatch", peer->host, | |
2414 | lookup_msg(attr_str, type, NULL)); | |
2415 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2416 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2417 | if (as4_path) | |
2418 | aspath_unintern(&as4_path); | |
2419 | return BGP_ATTR_PARSE_ERROR; | |
2420 | } | |
2421 | ||
2422 | /* Check all mandatory well-known attributes are present */ | |
718e3744 | 2423 | { |
d62a17ae | 2424 | bgp_attr_parse_ret_t ret; |
2425 | if ((ret = bgp_attr_check(peer, attr)) < 0) { | |
2426 | if (as4_path) | |
2427 | aspath_unintern(&as4_path); | |
2428 | return ret; | |
2429 | } | |
2430 | } | |
2431 | ||
2432 | /* | |
2433 | * At this place we can see whether we got AS4_PATH and/or | |
2434 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2435 | * We can not do this before we've read all attributes because | |
2436 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2437 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2438 | * in relationship to AGGREGATOR. | |
2439 | * So, to be defensive, we are not relying on any order and read | |
2440 | * all attributes first, including these 32bit ones, and now, | |
2441 | * afterwards, we look what and if something is to be done for as4. | |
2442 | * | |
2443 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2444 | * MP_UNREACH_NLRI. | |
2445 | */ | |
2446 | /* actually... this doesn't ever return failure currently, but | |
2447 | * better safe than sorry */ | |
2448 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2449 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2450 | &as4_aggregator_addr)) { | |
2451 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2452 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2453 | if (as4_path) | |
2454 | aspath_unintern(&as4_path); | |
2455 | return BGP_ATTR_PARSE_ERROR; | |
2456 | } | |
2457 | ||
2458 | /* At this stage, we have done all fiddling with as4, and the | |
2459 | * resulting info is in attr->aggregator resp. attr->aspath | |
2460 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2461 | * order to save memory | |
2462 | */ | |
2463 | if (as4_path) { | |
2464 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2465 | /* The flag that we got this is still there, but that does not | |
2466 | * do any trouble | |
2467 | */ | |
2468 | } | |
2469 | /* | |
2470 | * The "rest" of the code does nothing with as4_aggregator. | |
2471 | * there is no memory attached specifically which is not part | |
2472 | * of the attr. | |
2473 | * so ignoring just means do nothing. | |
2474 | */ | |
2475 | /* | |
2476 | * Finally do the checks on the aspath we did not do yet | |
2477 | * because we waited for a potentially synthesized aspath. | |
2478 | */ | |
2479 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2480 | ret = bgp_attr_aspath_check(peer, attr); | |
2481 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2482 | return ret; | |
2483 | } | |
2484 | /* Finally intern unknown attribute. */ | |
2485 | if (attr->transit) | |
2486 | attr->transit = transit_intern(attr->transit); | |
2487 | if (attr->encap_subtlvs) | |
2488 | attr->encap_subtlvs = | |
2489 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2490 | #if ENABLE_BGP_VNC |
d62a17ae | 2491 | if (attr->vnc_subtlvs) |
2492 | attr->vnc_subtlvs = | |
2493 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2494 | #endif |
718e3744 | 2495 | |
d62a17ae | 2496 | return BGP_ATTR_PARSE_PROCEED; |
2497 | } | |
2498 | ||
2499 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, | |
2500 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2501 | struct attr *attr) | |
2502 | { | |
2503 | size_t sizep; | |
2504 | iana_afi_t pkt_afi; | |
5c525538 | 2505 | iana_safi_t pkt_safi; |
d62a17ae | 2506 | afi_t nh_afi; |
2507 | ||
2508 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2509 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2510 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2511 | sizep = stream_get_endp(s); | |
2512 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2513 | ||
2514 | ||
2515 | /* Convert AFI, SAFI to values for packet. */ | |
2516 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2517 | ||
2518 | stream_putw(s, pkt_afi); /* AFI */ | |
2519 | stream_putc(s, pkt_safi); /* SAFI */ | |
2520 | ||
2521 | /* Nexthop AFI */ | |
ce78a6fb | 2522 | if (afi == AFI_IP |
2523 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
d62a17ae | 2524 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
d62a17ae | 2525 | else |
2526 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2527 | ||
2528 | /* Nexthop */ | |
2529 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2530 | switch (nh_afi) { | |
2531 | case AFI_IP: | |
2532 | switch (safi) { | |
2533 | case SAFI_UNICAST: | |
2534 | case SAFI_MULTICAST: | |
2535 | case SAFI_LABELED_UNICAST: | |
2536 | stream_putc(s, 4); | |
2537 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2538 | break; | |
2539 | case SAFI_MPLS_VPN: | |
2540 | stream_putc(s, 12); | |
2541 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2542 | stream_putl(s, 0); | |
2543 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2544 | break; | |
2545 | case SAFI_ENCAP: | |
2546 | case SAFI_EVPN: | |
2547 | stream_putc(s, 4); | |
2548 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2549 | break; | |
2550 | default: | |
2551 | break; | |
2552 | } | |
2553 | break; | |
2554 | case AFI_IP6: | |
2555 | switch (safi) { | |
2556 | case SAFI_UNICAST: | |
2557 | case SAFI_MULTICAST: | |
2558 | case SAFI_LABELED_UNICAST: | |
2559 | case SAFI_EVPN: { | |
2560 | if (attr->mp_nexthop_len | |
2561 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2562 | stream_putc(s, | |
2563 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2564 | stream_put(s, &attr->mp_nexthop_global, | |
2565 | IPV6_MAX_BYTELEN); | |
2566 | stream_put(s, &attr->mp_nexthop_local, | |
2567 | IPV6_MAX_BYTELEN); | |
2568 | } else { | |
2569 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2570 | stream_put(s, &attr->mp_nexthop_global, | |
2571 | IPV6_MAX_BYTELEN); | |
2572 | } | |
2573 | } break; | |
2574 | case SAFI_MPLS_VPN: { | |
2575 | if (attr->mp_nexthop_len | |
2576 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2577 | stream_putc(s, 24); | |
2578 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2579 | stream_putl(s, 0); | |
2580 | stream_put(s, &attr->mp_nexthop_global, | |
2581 | IPV6_MAX_BYTELEN); | |
2582 | } else if (attr->mp_nexthop_len | |
2583 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2584 | stream_putc(s, 48); | |
2585 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2586 | stream_putl(s, 0); | |
2587 | stream_put(s, &attr->mp_nexthop_global, | |
2588 | IPV6_MAX_BYTELEN); | |
2589 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2590 | stream_putl(s, 0); | |
2591 | stream_put(s, &attr->mp_nexthop_local, | |
2592 | IPV6_MAX_BYTELEN); | |
2593 | } | |
2594 | } break; | |
2595 | case SAFI_ENCAP: | |
2596 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2597 | stream_put(s, &attr->mp_nexthop_global, | |
2598 | IPV6_MAX_BYTELEN); | |
2599 | break; | |
2600 | default: | |
2601 | break; | |
2602 | } | |
2603 | break; | |
8c71e481 | 2604 | default: |
d62a17ae | 2605 | zlog_err( |
2606 | "Bad nexthop when sening to %s, AFI %u SAFI %u nhlen %d", | |
2607 | peer->host, afi, safi, attr->mp_nexthop_len); | |
2608 | break; | |
2609 | } | |
2610 | ||
2611 | /* SNPA */ | |
2612 | stream_putc(s, 0); | |
2613 | return sizep; | |
2614 | } | |
2615 | ||
2616 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2617 | struct prefix *p, struct prefix_rd *prd, | |
2618 | mpls_label_t *label, int addpath_encode, | |
2619 | u_int32_t addpath_tx_id, struct attr *attr) | |
2620 | { | |
2621 | if (safi == SAFI_MPLS_VPN) { | |
2622 | if (addpath_encode) | |
2623 | stream_putl(s, addpath_tx_id); | |
2624 | /* Label, RD, Prefix write. */ | |
2625 | stream_putc(s, p->prefixlen + 88); | |
2626 | stream_put(s, label, BGP_LABEL_BYTES); | |
2627 | stream_put(s, prd->val, 8); | |
2628 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2629 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2630 | /* EVPN prefix - contents depend on type */ | |
2631 | bgp_evpn_encode_prefix(s, p, prd, label, attr, addpath_encode, | |
2632 | addpath_tx_id); | |
2633 | } else if (safi == SAFI_LABELED_UNICAST) { | |
2634 | /* Prefix write with label. */ | |
2635 | stream_put_labeled_prefix(s, p, label); | |
2636 | } else | |
2637 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2638 | } | |
2639 | ||
2640 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2641 | { | |
2642 | int size = PSIZE(p->prefixlen); | |
2643 | if (safi == SAFI_MPLS_VPN) | |
2644 | size += 88; | |
2645 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2646 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2647 | // type-5 | |
2648 | return size; | |
8c71e481 PM |
2649 | } |
2650 | ||
f4c89855 | 2651 | /* |
65efcfce | 2652 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 2653 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 2654 | * almost the same TLV format |
f4c89855 | 2655 | */ |
d62a17ae | 2656 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
2657 | struct stream *s, struct attr *attr, | |
2658 | uint8_t attrtype) | |
2659 | { | |
2660 | unsigned int attrlenfield = 0; | |
2661 | unsigned int attrhdrlen = 0; | |
2662 | struct bgp_attr_encap_subtlv *subtlvs; | |
2663 | struct bgp_attr_encap_subtlv *st; | |
2664 | const char *attrname; | |
2665 | ||
9d303b37 DL |
2666 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
2667 | && (!attr->encap_tunneltype | |
2668 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 2669 | return; |
2670 | ||
2671 | switch (attrtype) { | |
f4c89855 | 2672 | case BGP_ATTR_ENCAP: |
d62a17ae | 2673 | attrname = "Tunnel Encap"; |
2674 | subtlvs = attr->encap_subtlvs; | |
2675 | if (subtlvs == NULL) /* nothing to do */ | |
2676 | return; | |
2677 | /* | |
2678 | * The tunnel encap attr has an "outer" tlv. | |
2679 | * T = tunneltype, | |
2680 | * L = total length of subtlvs, | |
2681 | * V = concatenated subtlvs. | |
2682 | */ | |
2683 | attrlenfield = 2 + 2; /* T + L */ | |
2684 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
2685 | break; | |
f4c89855 | 2686 | |
65efcfce LB |
2687 | #if ENABLE_BGP_VNC |
2688 | case BGP_ATTR_VNC: | |
d62a17ae | 2689 | attrname = "VNC"; |
2690 | subtlvs = attr->vnc_subtlvs; | |
2691 | if (subtlvs == NULL) /* nothing to do */ | |
2692 | return; | |
2693 | attrlenfield = 0; /* no outer T + L */ | |
2694 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2695 | break; | |
65efcfce LB |
2696 | #endif |
2697 | ||
f4c89855 | 2698 | default: |
d62a17ae | 2699 | assert(0); |
2700 | } | |
2701 | ||
2702 | /* compute attr length */ | |
2703 | for (st = subtlvs; st; st = st->next) { | |
2704 | attrlenfield += (attrhdrlen + st->length); | |
2705 | } | |
2706 | ||
2707 | if (attrlenfield > 0xffff) { | |
2708 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
2709 | attrname, attrlenfield); | |
2710 | return; | |
2711 | } | |
2712 | ||
2713 | if (attrlenfield > 0xff) { | |
2714 | /* 2-octet length field */ | |
ce78a6fb | 2715 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL |
2716 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2717 | stream_putc(s, attrtype); |
2718 | stream_putw(s, attrlenfield & 0xffff); | |
2719 | } else { | |
2720 | /* 1-octet length field */ | |
2721 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
2722 | stream_putc(s, attrtype); | |
2723 | stream_putc(s, attrlenfield & 0xff); | |
2724 | } | |
2725 | ||
2726 | if (attrtype == BGP_ATTR_ENCAP) { | |
2727 | /* write outer T+L */ | |
2728 | stream_putw(s, attr->encap_tunneltype); | |
2729 | stream_putw(s, attrlenfield - 4); | |
2730 | } | |
2731 | ||
2732 | /* write each sub-tlv */ | |
2733 | for (st = subtlvs; st; st = st->next) { | |
2734 | if (attrtype == BGP_ATTR_ENCAP) { | |
2735 | stream_putc(s, st->type); | |
2736 | stream_putc(s, st->length); | |
65efcfce | 2737 | #if ENABLE_BGP_VNC |
d62a17ae | 2738 | } else { |
2739 | stream_putw(s, st->type); | |
2740 | stream_putw(s, st->length); | |
65efcfce | 2741 | #endif |
d62a17ae | 2742 | } |
2743 | stream_put(s, st->value, st->length); | |
2744 | } | |
f4c89855 | 2745 | } |
f4c89855 | 2746 | |
d62a17ae | 2747 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 2748 | { |
d62a17ae | 2749 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
2750 | the attr length */ | |
2751 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
2752 | } |
2753 | ||
718e3744 | 2754 | /* Make attribute packet. */ |
d62a17ae | 2755 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
2756 | struct stream *s, struct attr *attr, | |
2757 | struct bpacket_attr_vec_arr *vecarr, | |
2758 | struct prefix *p, afi_t afi, safi_t safi, | |
2759 | struct peer *from, struct prefix_rd *prd, | |
2760 | mpls_label_t *label, int addpath_encode, | |
2761 | u_int32_t addpath_tx_id) | |
2762 | { | |
2763 | size_t cp; | |
2764 | size_t aspath_sizep; | |
2765 | struct aspath *aspath; | |
2766 | int send_as4_path = 0; | |
2767 | int send_as4_aggregator = 0; | |
2768 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
2769 | ||
2770 | if (!bgp) | |
2771 | bgp = peer->bgp; | |
2772 | ||
2773 | /* Remember current pointer. */ | |
2774 | cp = stream_get_endp(s); | |
2775 | ||
2776 | if (p | |
2777 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
2778 | && !peer_cap_enhe(peer, afi, safi))) { | |
2779 | size_t mpattrlen_pos = 0; | |
2780 | ||
2781 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
2782 | vecarr, attr); | |
2783 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, | |
2784 | addpath_encode, addpath_tx_id, attr); | |
2785 | bgp_packet_mpattr_end(s, mpattrlen_pos); | |
718e3744 | 2786 | } |
d62a17ae | 2787 | |
2788 | /* Origin attribute. */ | |
2789 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2790 | stream_putc(s, BGP_ATTR_ORIGIN); | |
2791 | stream_putc(s, 1); | |
2792 | stream_putc(s, attr->origin); | |
2793 | ||
2794 | /* AS path attribute. */ | |
2795 | ||
2796 | /* If remote-peer is EBGP */ | |
2797 | if (peer->sort == BGP_PEER_EBGP | |
2798 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
2799 | PEER_FLAG_AS_PATH_UNCHANGED) | |
2800 | || attr->aspath->segments == NULL) | |
2801 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
2802 | PEER_FLAG_RSERVER_CLIENT))) { | |
2803 | aspath = aspath_dup(attr->aspath); | |
2804 | ||
2805 | /* Even though we may not be configured for confederations we | |
2806 | * may have | |
2807 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
2808 | aspath = aspath_delete_confed_seq(aspath); | |
2809 | ||
2810 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
2811 | /* Stuff our path CONFED_ID on the front */ | |
2812 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
2813 | } else { | |
2814 | if (peer->change_local_as) { | |
2815 | /* If replace-as is specified, we only use the | |
2816 | change_local_as when | |
2817 | advertising routes. */ | |
2818 | if (!CHECK_FLAG( | |
2819 | peer->flags, | |
2820 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) { | |
2821 | aspath = aspath_add_seq(aspath, | |
2822 | peer->local_as); | |
2823 | } | |
2824 | aspath = aspath_add_seq(aspath, | |
2825 | peer->change_local_as); | |
2826 | } else { | |
2827 | aspath = aspath_add_seq(aspath, peer->local_as); | |
2828 | } | |
2829 | } | |
2830 | } else if (peer->sort == BGP_PEER_CONFED) { | |
2831 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
2832 | * thing */ | |
2833 | aspath = aspath_dup(attr->aspath); | |
2834 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
2835 | } else | |
2836 | aspath = attr->aspath; | |
2837 | ||
2838 | /* If peer is not AS4 capable, then: | |
2839 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
2840 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
2841 | * segment | |
2842 | * types are in it (i.e. exclude them if they are there) | |
2843 | * AND do this only if there is at least one asnum > 65535 in the | |
2844 | * path! | |
2845 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
2846 | * change | |
2847 | * all ASnums > 65535 to BGP_AS_TRANS | |
2848 | */ | |
2849 | ||
2850 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
2851 | stream_putc(s, BGP_ATTR_AS_PATH); | |
2852 | aspath_sizep = stream_get_endp(s); | |
2853 | stream_putw(s, 0); | |
2854 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
2855 | ||
2856 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
2857 | * in the path | |
2858 | */ | |
2859 | if (!use32bit && aspath_has_as4(aspath)) | |
2860 | send_as4_path = | |
2861 | 1; /* we'll do this later, at the correct place */ | |
2862 | ||
2863 | /* Nexthop attribute. */ | |
2864 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
2865 | && !peer_cap_enhe(peer, afi, safi)) { | |
2866 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
2867 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2868 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
2869 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
2870 | attr); | |
2871 | stream_putc(s, 4); | |
2872 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2873 | } else if (peer_cap_enhe(from, afi, safi)) { | |
2874 | /* | |
2875 | * Likely this is the case when an IPv4 prefix was | |
2876 | * received with | |
2877 | * Extended Next-hop capability and now being advertised | |
2878 | * to | |
2879 | * non-ENHE peers. | |
2880 | * Setting the mandatory (ipv4) next-hop attribute here | |
2881 | * to enable | |
2882 | * implicit next-hop self with correct (ipv4 address | |
2883 | * family). | |
2884 | */ | |
2885 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2886 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
2887 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
2888 | NULL); | |
2889 | stream_putc(s, 4); | |
2890 | stream_put_ipv4(s, 0); | |
2891 | } | |
718e3744 | 2892 | } |
d62a17ae | 2893 | |
2894 | /* MED attribute. */ | |
2895 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
2896 | || bgp->maxmed_active) { | |
2897 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
2898 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
2899 | stream_putc(s, 4); | |
2900 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
2901 | : attr->med)); | |
2902 | } | |
2903 | ||
2904 | /* Local preference. */ | |
2905 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
2906 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2907 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
2908 | stream_putc(s, 4); | |
2909 | stream_putl(s, attr->local_pref); | |
2910 | } | |
2911 | ||
2912 | /* Atomic aggregate. */ | |
2913 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
2914 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2915 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
2916 | stream_putc(s, 0); | |
2917 | } | |
2918 | ||
2919 | /* Aggregator. */ | |
2920 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
2921 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
2922 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
2923 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
2924 | ||
2925 | if (use32bit) { | |
2926 | /* AS4 capable peer */ | |
2927 | stream_putc(s, 8); | |
2928 | stream_putl(s, attr->aggregator_as); | |
2929 | } else { | |
2930 | /* 2-byte AS peer */ | |
2931 | stream_putc(s, 6); | |
2932 | ||
2933 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
2934 | * used? */ | |
2935 | if (attr->aggregator_as > 65535) { | |
2936 | stream_putw(s, BGP_AS_TRANS); | |
2937 | ||
2938 | /* we have to send AS4_AGGREGATOR, too. | |
2939 | * we'll do that later in order to send | |
2940 | * attributes in ascending | |
2941 | * order. | |
2942 | */ | |
2943 | send_as4_aggregator = 1; | |
2944 | } else | |
2945 | stream_putw(s, (u_int16_t)attr->aggregator_as); | |
2946 | } | |
2947 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
2948 | } | |
2949 | ||
2950 | /* Community attribute. */ | |
2951 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
2952 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
2953 | if (attr->community->size * 4 > 255) { | |
ce78a6fb | 2954 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
2955 | | BGP_ATTR_FLAG_TRANS | |
2956 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2957 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
2958 | stream_putw(s, attr->community->size * 4); | |
2959 | } else { | |
ce78a6fb | 2960 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
2961 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 2962 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
2963 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 2964 | } |
d62a17ae | 2965 | stream_put(s, attr->community->val, attr->community->size * 4); |
2966 | } | |
2967 | ||
2968 | /* | |
2969 | * Large Community attribute. | |
2970 | */ | |
2971 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
2972 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
2973 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 2974 | if (lcom_length(attr->lcommunity) > 255) { |
ce78a6fb | 2975 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
2976 | | BGP_ATTR_FLAG_TRANS | |
2977 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2978 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 2979 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 2980 | } else { |
ce78a6fb | 2981 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
2982 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 2983 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 2984 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 2985 | } |
d62a17ae | 2986 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 2987 | lcom_length(attr->lcommunity)); |
d62a17ae | 2988 | } |
4372df71 | 2989 | |
d62a17ae | 2990 | /* Route Reflector. */ |
2991 | if (peer->sort == BGP_PEER_IBGP && from | |
2992 | && from->sort == BGP_PEER_IBGP) { | |
2993 | /* Originator ID. */ | |
2994 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
2995 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
2996 | stream_putc(s, 4); | |
2997 | ||
2998 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
2999 | stream_put_in_addr(s, &attr->originator_id); | |
3000 | else | |
3001 | stream_put_in_addr(s, &from->remote_id); | |
3002 | ||
3003 | /* Cluster list. */ | |
3004 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3005 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3006 | ||
3007 | if (attr->cluster) { | |
3008 | stream_putc(s, attr->cluster->length + 4); | |
3009 | /* If this peer configuration's parent BGP has | |
3010 | * cluster_id. */ | |
3011 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3012 | stream_put_in_addr(s, &bgp->cluster_id); | |
3013 | else | |
3014 | stream_put_in_addr(s, &bgp->router_id); | |
3015 | stream_put(s, attr->cluster->list, | |
3016 | attr->cluster->length); | |
3017 | } else { | |
3018 | stream_putc(s, 4); | |
3019 | /* If this peer configuration's parent BGP has | |
3020 | * cluster_id. */ | |
3021 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3022 | stream_put_in_addr(s, &bgp->cluster_id); | |
3023 | else | |
3024 | stream_put_in_addr(s, &bgp->router_id); | |
3025 | } | |
3026 | } | |
4372df71 | 3027 | |
d62a17ae | 3028 | /* Extended Communities attribute. */ |
3029 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3030 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3031 | if (peer->sort == BGP_PEER_IBGP | |
3032 | || peer->sort == BGP_PEER_CONFED) { | |
3033 | if (attr->ecommunity->size * 8 > 255) { | |
ce78a6fb | 3034 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3035 | | BGP_ATTR_FLAG_TRANS | |
3036 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3037 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3038 | stream_putw(s, attr->ecommunity->size * 8); | |
3039 | } else { | |
ce78a6fb | 3040 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3041 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3042 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3043 | stream_putc(s, attr->ecommunity->size * 8); | |
3044 | } | |
3045 | stream_put(s, attr->ecommunity->val, | |
3046 | attr->ecommunity->size * 8); | |
3047 | } else { | |
3048 | u_int8_t *pnt; | |
3049 | int tbit; | |
3050 | int ecom_tr_size = 0; | |
3051 | int i; | |
3052 | ||
3053 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3054 | pnt = attr->ecommunity->val + (i * 8); | |
3055 | tbit = *pnt; | |
3056 | ||
3057 | if (CHECK_FLAG(tbit, | |
3058 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3059 | continue; | |
3060 | ||
3061 | ecom_tr_size++; | |
3062 | } | |
3063 | ||
3064 | if (ecom_tr_size) { | |
3065 | if (ecom_tr_size * 8 > 255) { | |
3066 | stream_putc( | |
3067 | s, | |
3068 | BGP_ATTR_FLAG_OPTIONAL | |
3069 | | BGP_ATTR_FLAG_TRANS | |
3070 | | BGP_ATTR_FLAG_EXTLEN); | |
3071 | stream_putc(s, | |
3072 | BGP_ATTR_EXT_COMMUNITIES); | |
3073 | stream_putw(s, ecom_tr_size * 8); | |
3074 | } else { | |
3075 | stream_putc( | |
3076 | s, | |
3077 | BGP_ATTR_FLAG_OPTIONAL | |
3078 | | BGP_ATTR_FLAG_TRANS); | |
3079 | stream_putc(s, | |
3080 | BGP_ATTR_EXT_COMMUNITIES); | |
3081 | stream_putc(s, ecom_tr_size * 8); | |
3082 | } | |
3083 | ||
3084 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3085 | pnt = attr->ecommunity->val + (i * 8); | |
3086 | tbit = *pnt; | |
3087 | ||
3088 | if (CHECK_FLAG( | |
3089 | tbit, | |
3090 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3091 | continue; | |
3092 | ||
3093 | stream_put(s, pnt, 8); | |
3094 | } | |
3095 | } | |
3096 | } | |
3097 | } | |
4372df71 | 3098 | |
d62a17ae | 3099 | /* Label index attribute. */ |
3100 | if (safi == SAFI_LABELED_UNICAST) { | |
3101 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3102 | u_int32_t label_index; | |
3103 | ||
3104 | label_index = attr->label_index; | |
3105 | ||
3106 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
ce78a6fb | 3107 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3108 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3109 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3110 | stream_putc(s, 10); | |
3111 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3112 | stream_putw(s, | |
3113 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3114 | stream_putc(s, 0); // reserved | |
3115 | stream_putw(s, 0); // flags | |
3116 | stream_putl(s, label_index); | |
3117 | } | |
4372df71 | 3118 | } |
d62a17ae | 3119 | } |
3120 | ||
3121 | if (send_as4_path) { | |
3122 | /* If the peer is NOT As4 capable, AND */ | |
3123 | /* there are ASnums > 65535 in path THEN | |
3124 | * give out AS4_PATH */ | |
3125 | ||
3126 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3127 | * path segments! | |
3128 | * Hm, I wonder... confederation things *should* only be at | |
3129 | * the beginning of an aspath, right? Then we should use | |
3130 | * aspath_delete_confed_seq for this, because it is already | |
3131 | * there! (JK) | |
3132 | * Folks, talk to me: what is reasonable here!? | |
3133 | */ | |
3134 | aspath = aspath_delete_confed_seq(aspath); | |
3135 | ||
ce78a6fb | 3136 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL |
3137 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3138 | stream_putc(s, BGP_ATTR_AS4_PATH); |
3139 | aspath_sizep = stream_get_endp(s); | |
3140 | stream_putw(s, 0); | |
3141 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3142 | } | |
3143 | ||
3144 | if (aspath != attr->aspath) | |
3145 | aspath_free(aspath); | |
3146 | ||
3147 | if (send_as4_aggregator) { | |
3148 | /* send AS4_AGGREGATOR, at this place */ | |
3149 | /* this section of code moved here in order to ensure the | |
3150 | * correct | |
3151 | * *ascending* order of attributes | |
3152 | */ | |
3153 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3154 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3155 | stream_putc(s, 8); | |
3156 | stream_putl(s, attr->aggregator_as); | |
3157 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3158 | } | |
3159 | ||
3160 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3161 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3162 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3163 | /* Tunnel Encap attribute */ | |
3164 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3165 | |
3166 | #if ENABLE_BGP_VNC | |
d62a17ae | 3167 | /* VNC attribute */ |
3168 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 3169 | #endif |
d62a17ae | 3170 | } |
587ff0fd | 3171 | |
d62a17ae | 3172 | /* Unknown transit attribute. */ |
3173 | if (attr->transit) | |
3174 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 3175 | |
d62a17ae | 3176 | /* Return total size of attribute. */ |
3177 | return stream_get_endp(s) - cp; | |
718e3744 | 3178 | } |
3179 | ||
d62a17ae | 3180 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 3181 | { |
d62a17ae | 3182 | unsigned long attrlen_pnt; |
3183 | iana_afi_t pkt_afi; | |
5c525538 | 3184 | iana_safi_t pkt_safi; |
718e3744 | 3185 | |
d62a17ae | 3186 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3187 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3188 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 3189 | |
d62a17ae | 3190 | attrlen_pnt = stream_get_endp(s); |
3191 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 3192 | |
d62a17ae | 3193 | /* Convert AFI, SAFI to values for packet. */ |
3194 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 3195 | |
d62a17ae | 3196 | stream_putw(s, pkt_afi); |
3197 | stream_putc(s, pkt_safi); | |
9cabb64b | 3198 | |
d62a17ae | 3199 | return attrlen_pnt; |
8c71e481 | 3200 | } |
718e3744 | 3201 | |
d62a17ae | 3202 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, |
3203 | safi_t safi, struct prefix_rd *prd, | |
3204 | mpls_label_t *label, int addpath_encode, | |
3205 | u_int32_t addpath_tx_id, struct attr *attr) | |
8c71e481 | 3206 | { |
d62a17ae | 3207 | u_char wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 3208 | |
d62a17ae | 3209 | if (safi == SAFI_LABELED_UNICAST) |
3210 | label = (mpls_label_t *)wlabel; | |
cd1964ff | 3211 | |
d62a17ae | 3212 | return bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3213 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 3214 | } |
718e3744 | 3215 | |
d62a17ae | 3216 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 3217 | { |
d62a17ae | 3218 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 3219 | } |
3220 | ||
3221 | /* Initialization of attribute. */ | |
d62a17ae | 3222 | void bgp_attr_init(void) |
718e3744 | 3223 | { |
d62a17ae | 3224 | aspath_init(); |
3225 | attrhash_init(); | |
3226 | community_init(); | |
3227 | ecommunity_init(); | |
3228 | lcommunity_init(); | |
3229 | cluster_init(); | |
3230 | transit_init(); | |
3231 | encap_init(); | |
718e3744 | 3232 | } |
3233 | ||
d62a17ae | 3234 | void bgp_attr_finish(void) |
228da428 | 3235 | { |
d62a17ae | 3236 | aspath_finish(); |
3237 | attrhash_finish(); | |
3238 | community_finish(); | |
3239 | ecommunity_finish(); | |
3240 | lcommunity_finish(); | |
3241 | cluster_finish(); | |
3242 | transit_finish(); | |
3243 | encap_finish(); | |
228da428 CC |
3244 | } |
3245 | ||
718e3744 | 3246 | /* Make attribute packet. */ |
d62a17ae | 3247 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
3248 | struct prefix *prefix) | |
3249 | { | |
3250 | unsigned long cp; | |
3251 | unsigned long len; | |
3252 | size_t aspath_lenp; | |
3253 | struct aspath *aspath; | |
3254 | int addpath_encode = 0; | |
3255 | u_int32_t addpath_tx_id = 0; | |
3256 | ||
3257 | /* Remember current pointer. */ | |
3258 | cp = stream_get_endp(s); | |
3259 | ||
3260 | /* Place holder of length. */ | |
3261 | stream_putw(s, 0); | |
3262 | ||
3263 | /* Origin attribute. */ | |
3264 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3265 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3266 | stream_putc(s, 1); | |
3267 | stream_putc(s, attr->origin); | |
3268 | ||
3269 | aspath = attr->aspath; | |
3270 | ||
3271 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3272 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3273 | aspath_lenp = stream_get_endp(s); | |
3274 | stream_putw(s, 0); | |
3275 | ||
3276 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3277 | ||
3278 | /* Nexthop attribute. */ | |
3279 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3280 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3281 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3282 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3283 | stream_putc(s, 4); | |
3284 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 3285 | } |
d62a17ae | 3286 | |
3287 | /* MED attribute. */ | |
3288 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3289 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3290 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3291 | stream_putc(s, 4); | |
3292 | stream_putl(s, attr->med); | |
3293 | } | |
3294 | ||
3295 | /* Local preference. */ | |
3296 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3297 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3298 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3299 | stream_putc(s, 4); | |
3300 | stream_putl(s, attr->local_pref); | |
3301 | } | |
3302 | ||
3303 | /* Atomic aggregate. */ | |
3304 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3305 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3306 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3307 | stream_putc(s, 0); | |
3308 | } | |
3309 | ||
3310 | /* Aggregator. */ | |
3311 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3312 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3313 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3314 | stream_putc(s, 8); | |
3315 | stream_putl(s, attr->aggregator_as); | |
3316 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3317 | } | |
3318 | ||
3319 | /* Community attribute. */ | |
3320 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3321 | if (attr->community->size * 4 > 255) { | |
ce78a6fb | 3322 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3323 | | BGP_ATTR_FLAG_TRANS | |
3324 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3325 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3326 | stream_putw(s, attr->community->size * 4); | |
3327 | } else { | |
ce78a6fb | 3328 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3329 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3330 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3331 | stream_putc(s, attr->community->size * 4); | |
3332 | } | |
3333 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3334 | } | |
3335 | ||
3336 | /* Large Community attribute. */ | |
3337 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 3338 | if (lcom_length(attr->lcommunity) > 255) { |
ce78a6fb | 3339 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3340 | | BGP_ATTR_FLAG_TRANS | |
3341 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3342 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3343 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3344 | } else { |
ce78a6fb | 3345 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3346 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3347 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3348 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3349 | } |
3350 | ||
79dab4b7 | 3351 | stream_put(s, attr->lcommunity->val, lcom_length(attr->lcommunity)); |
d62a17ae | 3352 | } |
3353 | ||
3354 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3355 | if (prefix != NULL && prefix->family == AF_INET6 | |
3356 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3357 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3358 | int sizep; | |
3359 | ||
3360 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3361 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3362 | sizep = stream_get_endp(s); | |
3363 | ||
3364 | /* MP header */ | |
3365 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3366 | stream_putw(s, AFI_IP6); /* AFI */ | |
3367 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3368 | ||
3369 | /* Next hop */ | |
3370 | stream_putc(s, attr->mp_nexthop_len); | |
3371 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3372 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3373 | stream_put(s, &attr->mp_nexthop_local, | |
3374 | IPV6_MAX_BYTELEN); | |
3375 | ||
3376 | /* SNPA */ | |
3377 | stream_putc(s, 0); | |
3378 | ||
3379 | /* Prefix */ | |
3380 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3381 | addpath_tx_id); | |
3382 | ||
3383 | /* Set MP attribute length. */ | |
3384 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3385 | } | |
3386 | ||
3387 | /* Prefix SID */ | |
3388 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3389 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
ce78a6fb | 3390 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3391 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3392 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3393 | stream_putc(s, 10); | |
3394 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3395 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3396 | stream_putc(s, 0); // reserved | |
3397 | stream_putw(s, 0); // flags | |
3398 | stream_putl(s, attr->label_index); | |
3399 | } | |
3400 | } | |
3401 | ||
3402 | /* Return total size of attribute. */ | |
3403 | len = stream_get_endp(s) - cp - 2; | |
3404 | stream_putw_at(s, cp, len); | |
718e3744 | 3405 | } |