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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"}, | |
a21bd7a3 | 77 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 78 | {BGP_ATTR_ENCAP, "ENCAP"}, |
65efcfce | 79 | #if ENABLE_BGP_VNC |
d62a17ae | 80 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 81 | #endif |
d62a17ae | 82 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
83 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
84 | {0}}; | |
afcb7679 | 85 | |
9d303b37 DL |
86 | static const struct message attr_flag_str[] = |
87 | { | |
88 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
89 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
90 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
91 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
92 | this list */ | |
93 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
94 | {0}}; | |
6b0655a2 | 95 | |
9bddac4b | 96 | static struct hash *cluster_hash; |
718e3744 | 97 | |
d62a17ae | 98 | static void *cluster_hash_alloc(void *p) |
718e3744 | 99 | { |
d62a17ae | 100 | const struct cluster_list *val = (const struct cluster_list *)p; |
101 | struct cluster_list *cluster; | |
718e3744 | 102 | |
d62a17ae | 103 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
104 | cluster->length = val->length; | |
718e3744 | 105 | |
d62a17ae | 106 | if (cluster->length) { |
107 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
108 | memcpy(cluster->list, val->list, val->length); | |
109 | } else | |
110 | cluster->list = NULL; | |
718e3744 | 111 | |
d62a17ae | 112 | cluster->refcnt = 0; |
718e3744 | 113 | |
d62a17ae | 114 | return cluster; |
718e3744 | 115 | } |
116 | ||
117 | /* Cluster list related functions. */ | |
d62a17ae | 118 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 119 | { |
d62a17ae | 120 | struct cluster_list tmp; |
121 | struct cluster_list *cluster; | |
718e3744 | 122 | |
d62a17ae | 123 | tmp.length = length; |
124 | tmp.list = pnt; | |
718e3744 | 125 | |
d62a17ae | 126 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
127 | cluster->refcnt++; | |
128 | return cluster; | |
718e3744 | 129 | } |
130 | ||
d62a17ae | 131 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 132 | { |
d62a17ae | 133 | int i; |
134 | ||
135 | for (i = 0; i < cluster->length / 4; i++) | |
136 | if (cluster->list[i].s_addr == originator.s_addr) | |
137 | return 1; | |
138 | return 0; | |
718e3744 | 139 | } |
140 | ||
d62a17ae | 141 | static unsigned int cluster_hash_key_make(void *p) |
718e3744 | 142 | { |
d62a17ae | 143 | const struct cluster_list *cluster = p; |
718e3744 | 144 | |
d62a17ae | 145 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 146 | } |
147 | ||
d62a17ae | 148 | static int cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 149 | { |
d62a17ae | 150 | const struct cluster_list *cluster1 = p1; |
151 | const struct cluster_list *cluster2 = p2; | |
923de654 | 152 | |
d62a17ae | 153 | return (cluster1->length == cluster2->length |
154 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
155 | == 0); | |
718e3744 | 156 | } |
157 | ||
d62a17ae | 158 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 159 | { |
d62a17ae | 160 | if (cluster->list) |
161 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); | |
162 | XFREE(MTYPE_CLUSTER, cluster); | |
718e3744 | 163 | } |
164 | ||
d62a17ae | 165 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 166 | { |
d62a17ae | 167 | struct cluster_list *find; |
718e3744 | 168 | |
d62a17ae | 169 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
170 | find->refcnt++; | |
718e3744 | 171 | |
d62a17ae | 172 | return find; |
718e3744 | 173 | } |
174 | ||
d62a17ae | 175 | void cluster_unintern(struct cluster_list *cluster) |
718e3744 | 176 | { |
d62a17ae | 177 | if (cluster->refcnt) |
178 | cluster->refcnt--; | |
718e3744 | 179 | |
d62a17ae | 180 | if (cluster->refcnt == 0) { |
181 | hash_release(cluster_hash, cluster); | |
182 | cluster_free(cluster); | |
183 | } | |
718e3744 | 184 | } |
185 | ||
d62a17ae | 186 | static void cluster_init(void) |
718e3744 | 187 | { |
3f65c5b1 DS |
188 | cluster_hash = hash_create(cluster_hash_key_make, |
189 | cluster_hash_cmp, | |
190 | "BGP Cluster"); | |
718e3744 | 191 | } |
228da428 | 192 | |
d62a17ae | 193 | static void cluster_finish(void) |
228da428 | 194 | { |
d62a17ae | 195 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
196 | hash_free(cluster_hash); | |
197 | cluster_hash = NULL; | |
228da428 | 198 | } |
6b0655a2 | 199 | |
bede7744 LB |
200 | static struct hash *encap_hash = NULL; |
201 | #if ENABLE_BGP_VNC | |
202 | static struct hash *vnc_hash = NULL; | |
203 | #endif | |
204 | ||
d62a17ae | 205 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 206 | { |
d62a17ae | 207 | struct bgp_attr_encap_subtlv *new; |
208 | struct bgp_attr_encap_subtlv *tail; | |
209 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 210 | |
d62a17ae | 211 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 212 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 213 | if (tail) { |
214 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
215 | tail = tail->next; | |
216 | } else { | |
217 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
218 | } | |
219 | assert(tail); | |
220 | memcpy(tail, p, size); | |
221 | tail->next = NULL; | |
f4c89855 | 222 | } |
f4c89855 | 223 | |
d62a17ae | 224 | return new; |
f4c89855 LB |
225 | } |
226 | ||
d62a17ae | 227 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 228 | { |
d62a17ae | 229 | struct bgp_attr_encap_subtlv *next; |
230 | while (p) { | |
231 | next = p->next; | |
232 | p->next = NULL; | |
233 | XFREE(MTYPE_ENCAP_TLV, p); | |
234 | p = next; | |
235 | } | |
f4c89855 LB |
236 | } |
237 | ||
d62a17ae | 238 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 239 | { |
d62a17ae | 240 | if (!attr) |
241 | return; | |
f4c89855 | 242 | |
d62a17ae | 243 | if (attr->encap_subtlvs) { |
244 | encap_free(attr->encap_subtlvs); | |
245 | attr->encap_subtlvs = NULL; | |
246 | } | |
65efcfce | 247 | #if ENABLE_BGP_VNC |
d62a17ae | 248 | if (attr->vnc_subtlvs) { |
249 | encap_free(attr->vnc_subtlvs); | |
250 | attr->vnc_subtlvs = NULL; | |
251 | } | |
65efcfce | 252 | #endif |
f4c89855 LB |
253 | } |
254 | ||
255 | /* | |
256 | * Compare encap sub-tlv chains | |
257 | * | |
258 | * 1 = equivalent | |
259 | * 0 = not equivalent | |
260 | * | |
261 | * This algorithm could be made faster if needed | |
262 | */ | |
d62a17ae | 263 | static int encap_same(struct bgp_attr_encap_subtlv *h1, |
264 | struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 265 | { |
d62a17ae | 266 | struct bgp_attr_encap_subtlv *p; |
267 | struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 268 | |
d62a17ae | 269 | if (h1 == h2) |
270 | return 1; | |
271 | if (h1 == NULL || h2 == NULL) | |
272 | return 0; | |
f4c89855 | 273 | |
d62a17ae | 274 | for (p = h1; p; p = p->next) { |
275 | for (q = h2; q; q = q->next) { | |
276 | if ((p->type == q->type) && (p->length == q->length) | |
277 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 278 | |
d62a17ae | 279 | break; |
280 | } | |
281 | } | |
282 | if (!q) | |
283 | return 0; | |
f4c89855 | 284 | } |
f4c89855 | 285 | |
d62a17ae | 286 | for (p = h2; p; p = p->next) { |
287 | for (q = h1; q; q = q->next) { | |
288 | if ((p->type == q->type) && (p->length == q->length) | |
289 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 290 | |
d62a17ae | 291 | break; |
292 | } | |
293 | } | |
294 | if (!q) | |
295 | return 0; | |
f4c89855 | 296 | } |
f4c89855 | 297 | |
d62a17ae | 298 | return 1; |
f4c89855 LB |
299 | } |
300 | ||
d62a17ae | 301 | static void *encap_hash_alloc(void *p) |
bede7744 | 302 | { |
d62a17ae | 303 | /* Encap structure is already allocated. */ |
304 | return p; | |
bede7744 LB |
305 | } |
306 | ||
d62a17ae | 307 | typedef enum { |
308 | ENCAP_SUBTLV_TYPE, | |
bede7744 | 309 | #if ENABLE_BGP_VNC |
d62a17ae | 310 | VNC_SUBTLV_TYPE |
bede7744 LB |
311 | #endif |
312 | } encap_subtlv_type; | |
313 | ||
314 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 315 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 316 | { |
d62a17ae | 317 | struct bgp_attr_encap_subtlv *find; |
318 | struct hash *hash = encap_hash; | |
bede7744 | 319 | #if ENABLE_BGP_VNC |
d62a17ae | 320 | if (type == VNC_SUBTLV_TYPE) |
321 | hash = vnc_hash; | |
bede7744 LB |
322 | #endif |
323 | ||
d62a17ae | 324 | find = hash_get(hash, encap, encap_hash_alloc); |
325 | if (find != encap) | |
326 | encap_free(encap); | |
327 | find->refcnt++; | |
bede7744 | 328 | |
d62a17ae | 329 | return find; |
bede7744 LB |
330 | } |
331 | ||
d62a17ae | 332 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
333 | encap_subtlv_type type) | |
bede7744 | 334 | { |
d62a17ae | 335 | struct bgp_attr_encap_subtlv *encap = *encapp; |
336 | if (encap->refcnt) | |
337 | encap->refcnt--; | |
bede7744 | 338 | |
d62a17ae | 339 | if (encap->refcnt == 0) { |
340 | struct hash *hash = encap_hash; | |
bede7744 | 341 | #if ENABLE_BGP_VNC |
d62a17ae | 342 | if (type == VNC_SUBTLV_TYPE) |
343 | hash = vnc_hash; | |
bede7744 | 344 | #endif |
d62a17ae | 345 | hash_release(hash, encap); |
346 | encap_free(encap); | |
347 | *encapp = NULL; | |
348 | } | |
bede7744 LB |
349 | } |
350 | ||
d62a17ae | 351 | static unsigned int encap_hash_key_make(void *p) |
bede7744 | 352 | { |
d62a17ae | 353 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 354 | |
d62a17ae | 355 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
356 | } |
357 | ||
d62a17ae | 358 | static int encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 359 | { |
d62a17ae | 360 | return encap_same((struct bgp_attr_encap_subtlv *)p1, |
361 | (struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
362 | } |
363 | ||
d62a17ae | 364 | static void encap_init(void) |
bede7744 | 365 | { |
3f65c5b1 DS |
366 | encap_hash = hash_create(encap_hash_key_make, |
367 | encap_hash_cmp, | |
368 | "BGP Encap Hash"); | |
bede7744 | 369 | #if ENABLE_BGP_VNC |
3f65c5b1 DS |
370 | vnc_hash = hash_create(encap_hash_key_make, |
371 | encap_hash_cmp, | |
372 | "BGP VNC Hash"); | |
bede7744 LB |
373 | #endif |
374 | } | |
375 | ||
d62a17ae | 376 | static void encap_finish(void) |
bede7744 | 377 | { |
d62a17ae | 378 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
379 | hash_free(encap_hash); | |
380 | encap_hash = NULL; | |
bede7744 | 381 | #if ENABLE_BGP_VNC |
d62a17ae | 382 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
383 | hash_free(vnc_hash); | |
384 | vnc_hash = NULL; | |
bede7744 LB |
385 | #endif |
386 | } | |
387 | ||
d62a17ae | 388 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 389 | { |
d62a17ae | 390 | if (!a1 && a2) |
391 | return false; | |
392 | if (!a2 && a1) | |
393 | return false; | |
394 | if (!a1 && !a2) | |
395 | return true; | |
396 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
397 | sizeof(struct overlay_index)); | |
684a7227 PG |
398 | } |
399 | ||
718e3744 | 400 | /* Unknown transit attribute. */ |
9bddac4b | 401 | static struct hash *transit_hash; |
718e3744 | 402 | |
d62a17ae | 403 | static void transit_free(struct transit *transit) |
718e3744 | 404 | { |
d62a17ae | 405 | if (transit->val) |
406 | XFREE(MTYPE_TRANSIT_VAL, transit->val); | |
407 | XFREE(MTYPE_TRANSIT, transit); | |
718e3744 | 408 | } |
409 | ||
d62a17ae | 410 | static void *transit_hash_alloc(void *p) |
718e3744 | 411 | { |
d62a17ae | 412 | /* Transit structure is already allocated. */ |
413 | return p; | |
718e3744 | 414 | } |
415 | ||
d62a17ae | 416 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 417 | { |
d62a17ae | 418 | struct transit *find; |
718e3744 | 419 | |
d62a17ae | 420 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
421 | if (find != transit) | |
422 | transit_free(transit); | |
423 | find->refcnt++; | |
718e3744 | 424 | |
d62a17ae | 425 | return find; |
718e3744 | 426 | } |
427 | ||
d62a17ae | 428 | void transit_unintern(struct transit *transit) |
718e3744 | 429 | { |
d62a17ae | 430 | if (transit->refcnt) |
431 | transit->refcnt--; | |
718e3744 | 432 | |
d62a17ae | 433 | if (transit->refcnt == 0) { |
434 | hash_release(transit_hash, transit); | |
435 | transit_free(transit); | |
436 | } | |
718e3744 | 437 | } |
438 | ||
d62a17ae | 439 | static unsigned int transit_hash_key_make(void *p) |
718e3744 | 440 | { |
d62a17ae | 441 | const struct transit *transit = p; |
718e3744 | 442 | |
d62a17ae | 443 | return jhash(transit->val, transit->length, 0); |
718e3744 | 444 | } |
445 | ||
d62a17ae | 446 | static int transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 447 | { |
d62a17ae | 448 | const struct transit *transit1 = p1; |
449 | const struct transit *transit2 = p2; | |
923de654 | 450 | |
d62a17ae | 451 | return (transit1->length == transit2->length |
452 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 453 | } |
454 | ||
d62a17ae | 455 | static void transit_init(void) |
718e3744 | 456 | { |
3f65c5b1 DS |
457 | transit_hash = hash_create(transit_hash_key_make, |
458 | transit_hash_cmp, | |
459 | "BGP Transit Hash"); | |
718e3744 | 460 | } |
228da428 | 461 | |
d62a17ae | 462 | static void transit_finish(void) |
228da428 | 463 | { |
d62a17ae | 464 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
465 | hash_free(transit_hash); | |
466 | transit_hash = NULL; | |
228da428 | 467 | } |
6b0655a2 | 468 | |
718e3744 | 469 | /* Attribute hash routines. */ |
9bddac4b | 470 | static struct hash *attrhash; |
718e3744 | 471 | |
fb982c25 PJ |
472 | /* Shallow copy of an attribute |
473 | * Though, not so shallow that it doesn't copy the contents | |
474 | * of the attr_extra pointed to by 'extra' | |
475 | */ | |
d62a17ae | 476 | void bgp_attr_dup(struct attr *new, struct attr *orig) |
fb982c25 | 477 | { |
d62a17ae | 478 | *new = *orig; |
fb982c25 PJ |
479 | } |
480 | ||
d62a17ae | 481 | unsigned long int attr_count(void) |
cbdfbaa5 | 482 | { |
d62a17ae | 483 | return attrhash->count; |
cbdfbaa5 PJ |
484 | } |
485 | ||
d62a17ae | 486 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 487 | { |
d62a17ae | 488 | return transit_hash->count; |
cbdfbaa5 PJ |
489 | } |
490 | ||
d62a17ae | 491 | unsigned int attrhash_key_make(void *p) |
718e3744 | 492 | { |
d62a17ae | 493 | const struct attr *attr = (struct attr *)p; |
494 | uint32_t key = 0; | |
c8e7b895 | 495 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 496 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 497 | |
0d0268a6 LB |
498 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
499 | MIX3(attr->local_pref, attr->aggregator_as, attr->aggregator_addr.s_addr); | |
500 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, | |
501 | attr->originator_id.s_addr); | |
502 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 503 | |
504 | if (attr->aspath) | |
505 | MIX(aspath_key_make(attr->aspath)); | |
506 | if (attr->community) | |
507 | MIX(community_hash_make(attr->community)); | |
508 | ||
509 | if (attr->lcommunity) | |
510 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
511 | if (attr->ecommunity) | |
512 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
513 | if (attr->cluster) | |
514 | MIX(cluster_hash_key_make(attr->cluster)); | |
515 | if (attr->transit) | |
516 | MIX(transit_hash_key_make(attr->transit)); | |
517 | if (attr->encap_subtlvs) | |
518 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
bede7744 | 519 | #if ENABLE_BGP_VNC |
d62a17ae | 520 | if (attr->vnc_subtlvs) |
521 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 522 | #endif |
d62a17ae | 523 | MIX(attr->mp_nexthop_len); |
524 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
525 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
526 | ||
527 | return key; | |
528 | } | |
529 | ||
530 | int attrhash_cmp(const void *p1, const void *p2) | |
531 | { | |
532 | const struct attr *attr1 = p1; | |
533 | const struct attr *attr2 = p2; | |
534 | ||
535 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
536 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
537 | && attr1->aspath == attr2->aspath | |
538 | && attr1->community == attr2->community && attr1->med == attr2->med | |
539 | && attr1->local_pref == attr2->local_pref | |
540 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
541 | if (attr1->aggregator_as == attr2->aggregator_as | |
542 | && attr1->aggregator_addr.s_addr | |
543 | == attr2->aggregator_addr.s_addr | |
544 | && attr1->weight == attr2->weight | |
545 | && attr1->tag == attr2->tag | |
546 | && attr1->label_index == attr2->label_index | |
547 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 548 | && attr1->ecommunity == attr2->ecommunity |
549 | && attr1->lcommunity == attr2->lcommunity | |
550 | && attr1->cluster == attr2->cluster | |
551 | && attr1->transit == attr2->transit | |
552 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
553 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
65efcfce | 554 | #if ENABLE_BGP_VNC |
d62a17ae | 555 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 556 | #endif |
0d0268a6 LB |
557 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
558 | &attr2->mp_nexthop_global) | |
559 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
560 | &attr2->mp_nexthop_local) | |
561 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
562 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 563 | && IPV4_ADDR_SAME(&attr1->originator_id, |
564 | &attr2->originator_id) | |
565 | && overlay_index_same(attr1, attr2)) | |
566 | return 1; | |
567 | } | |
aadc0905 | 568 | |
d62a17ae | 569 | return 0; |
718e3744 | 570 | } |
571 | ||
d62a17ae | 572 | static void attrhash_init(void) |
718e3744 | 573 | { |
3f65c5b1 DS |
574 | attrhash = hash_create(attrhash_key_make, |
575 | attrhash_cmp, | |
576 | "BGP Attributes"); | |
718e3744 | 577 | } |
578 | ||
289d2501 LB |
579 | /* |
580 | * special for hash_clean below | |
581 | */ | |
d62a17ae | 582 | static void attr_vfree(void *attr) |
289d2501 | 583 | { |
d62a17ae | 584 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
585 | } |
586 | ||
d62a17ae | 587 | static void attrhash_finish(void) |
228da428 | 588 | { |
d62a17ae | 589 | hash_clean(attrhash, attr_vfree); |
590 | hash_free(attrhash); | |
591 | attrhash = NULL; | |
228da428 CC |
592 | } |
593 | ||
d62a17ae | 594 | static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty) |
718e3744 | 595 | { |
d62a17ae | 596 | struct attr *attr = backet->data; |
718e3744 | 597 | |
d62a17ae | 598 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
599 | inet_ntoa(attr->nexthop)); | |
718e3744 | 600 | } |
601 | ||
d62a17ae | 602 | void attr_show_all(struct vty *vty) |
718e3744 | 603 | { |
9d303b37 DL |
604 | hash_iterate(attrhash, (void (*)(struct hash_backet *, |
605 | void *))attr_show_all_iterator, | |
606 | vty); | |
718e3744 | 607 | } |
608 | ||
d62a17ae | 609 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 610 | { |
d62a17ae | 611 | struct attr *val = (struct attr *)p; |
612 | struct attr *attr; | |
718e3744 | 613 | |
d62a17ae | 614 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
615 | *attr = *val; | |
616 | if (val->encap_subtlvs) { | |
617 | val->encap_subtlvs = NULL; | |
618 | } | |
65efcfce | 619 | #if ENABLE_BGP_VNC |
d62a17ae | 620 | if (val->vnc_subtlvs) { |
621 | val->vnc_subtlvs = NULL; | |
622 | } | |
65efcfce | 623 | #endif |
d62a17ae | 624 | attr->refcnt = 0; |
625 | return attr; | |
718e3744 | 626 | } |
627 | ||
628 | /* Internet argument attribute. */ | |
d62a17ae | 629 | struct attr *bgp_attr_intern(struct attr *attr) |
630 | { | |
631 | struct attr *find; | |
632 | ||
633 | /* Intern referenced strucutre. */ | |
634 | if (attr->aspath) { | |
635 | if (!attr->aspath->refcnt) | |
636 | attr->aspath = aspath_intern(attr->aspath); | |
637 | else | |
638 | attr->aspath->refcnt++; | |
639 | } | |
640 | if (attr->community) { | |
641 | if (!attr->community->refcnt) | |
642 | attr->community = community_intern(attr->community); | |
643 | else | |
644 | attr->community->refcnt++; | |
645 | } | |
646 | ||
647 | if (attr->ecommunity) { | |
648 | if (!attr->ecommunity->refcnt) | |
649 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
650 | else | |
651 | attr->ecommunity->refcnt++; | |
652 | } | |
653 | if (attr->lcommunity) { | |
654 | if (!attr->lcommunity->refcnt) | |
655 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
656 | else | |
657 | attr->lcommunity->refcnt++; | |
658 | } | |
659 | if (attr->cluster) { | |
660 | if (!attr->cluster->refcnt) | |
661 | attr->cluster = cluster_intern(attr->cluster); | |
662 | else | |
663 | attr->cluster->refcnt++; | |
664 | } | |
665 | if (attr->transit) { | |
666 | if (!attr->transit->refcnt) | |
667 | attr->transit = transit_intern(attr->transit); | |
668 | else | |
669 | attr->transit->refcnt++; | |
670 | } | |
671 | if (attr->encap_subtlvs) { | |
672 | if (!attr->encap_subtlvs->refcnt) | |
673 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
674 | ENCAP_SUBTLV_TYPE); | |
675 | else | |
676 | attr->encap_subtlvs->refcnt++; | |
677 | } | |
bede7744 | 678 | #if ENABLE_BGP_VNC |
d62a17ae | 679 | if (attr->vnc_subtlvs) { |
680 | if (!attr->vnc_subtlvs->refcnt) | |
681 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
682 | VNC_SUBTLV_TYPE); | |
683 | else | |
684 | attr->vnc_subtlvs->refcnt++; | |
685 | } | |
aadc0905 | 686 | #endif |
bede7744 | 687 | |
dbbac180 DL |
688 | /* At this point, attr only contains intern'd pointers. that means |
689 | * if we find it in attrhash, it has all the same pointers and we | |
690 | * correctly updated the refcounts on these. | |
691 | * If we don't find it, we need to allocate a one because in all | |
692 | * cases this returns a new reference to a hashed attr, but the input | |
693 | * wasn't on hash. */ | |
d62a17ae | 694 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
695 | find->refcnt++; | |
696 | ||
697 | return find; | |
718e3744 | 698 | } |
699 | ||
700 | /* Make network statement's attribute. */ | |
d62a17ae | 701 | struct attr *bgp_attr_default_set(struct attr *attr, u_char origin) |
718e3744 | 702 | { |
d62a17ae | 703 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 704 | |
d62a17ae | 705 | attr->origin = origin; |
706 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
707 | attr->aspath = aspath_empty(); | |
708 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
709 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
710 | attr->tag = 0; | |
711 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
712 | attr->label = MPLS_INVALID_LABEL; | |
713 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
714 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
715 | ||
716 | return attr; | |
718e3744 | 717 | } |
718 | ||
b5d58c32 | 719 | /* Create the attributes for an aggregate */ |
d62a17ae | 720 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, u_char origin, |
721 | struct aspath *aspath, | |
722 | struct community *community, int as_set, | |
723 | u_char atomic_aggregate) | |
724 | { | |
725 | struct attr attr; | |
726 | struct attr *new; | |
727 | ||
728 | memset(&attr, 0, sizeof(struct attr)); | |
729 | ||
730 | /* Origin attribute. */ | |
731 | attr.origin = origin; | |
732 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
733 | ||
734 | /* AS path attribute. */ | |
735 | if (aspath) | |
736 | attr.aspath = aspath_intern(aspath); | |
737 | else | |
738 | attr.aspath = aspath_empty(); | |
739 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
740 | ||
741 | /* Next hop attribute. */ | |
742 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
743 | ||
744 | if (community) { | |
7f323236 DW |
745 | u_int32_t gshut = COMMUNITY_GSHUT; |
746 | ||
747 | /* If we are not shutting down ourselves and we are | |
748 | * aggregating a route that contains the GSHUT community we | |
749 | * need to remove that community when creating the aggregate */ | |
750 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) && | |
751 | community_include(community, gshut)) { | |
752 | community_del_val(community, &gshut); | |
753 | } | |
754 | ||
d62a17ae | 755 | attr.community = community; |
756 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
757 | } | |
758 | ||
7f323236 DW |
759 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { |
760 | bgp_attr_add_gshut_community(&attr); | |
761 | } | |
762 | ||
d62a17ae | 763 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
764 | attr.label = MPLS_INVALID_LABEL; | |
765 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
766 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
767 | if (!as_set || atomic_aggregate) | |
768 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
769 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
770 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
771 | attr.aggregator_as = bgp->confed_id; | |
772 | else | |
773 | attr.aggregator_as = bgp->as; | |
774 | attr.aggregator_addr = bgp->router_id; | |
775 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
776 | attr.label = MPLS_INVALID_LABEL; | |
777 | ||
778 | new = bgp_attr_intern(&attr); | |
779 | ||
780 | aspath_unintern(&new->aspath); | |
781 | return new; | |
718e3744 | 782 | } |
783 | ||
b881c707 | 784 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 785 | void bgp_attr_unintern_sub(struct attr *attr) |
786 | { | |
787 | /* aspath refcount shoud be decrement. */ | |
788 | if (attr->aspath) | |
789 | aspath_unintern(&attr->aspath); | |
790 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
791 | ||
792 | if (attr->community) | |
793 | community_unintern(&attr->community); | |
794 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
795 | ||
796 | if (attr->ecommunity) | |
797 | ecommunity_unintern(&attr->ecommunity); | |
798 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
799 | ||
800 | if (attr->lcommunity) | |
801 | lcommunity_unintern(&attr->lcommunity); | |
802 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
803 | ||
804 | if (attr->cluster) | |
805 | cluster_unintern(attr->cluster); | |
806 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
807 | ||
808 | if (attr->transit) | |
809 | transit_unintern(attr->transit); | |
810 | ||
811 | if (attr->encap_subtlvs) | |
812 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
813 | |
814 | #if ENABLE_BGP_VNC | |
d62a17ae | 815 | if (attr->vnc_subtlvs) |
816 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 817 | #endif |
b881c707 PJ |
818 | } |
819 | ||
f46d8e1e DS |
820 | /* |
821 | * We have some show commands that let you experimentally | |
822 | * apply a route-map. When we apply the route-map | |
823 | * we are reseting values but not saving them for | |
824 | * posterity via intern'ing( because route-maps don't | |
825 | * do that) but at this point in time we need | |
826 | * to compare the new attr to the old and if the | |
827 | * routemap has changed it we need to, as Snoop Dog says, | |
828 | * Drop it like it's hot | |
829 | */ | |
830 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
831 | { | |
832 | if (new->aspath != old->aspath) | |
833 | aspath_free(new->aspath); | |
834 | ||
835 | if (new->community != old->community) | |
836 | community_free(new->community); | |
837 | ||
838 | if (new->ecommunity != old->ecommunity) | |
839 | ecommunity_free(&new->ecommunity); | |
840 | ||
841 | if (new->lcommunity != old->lcommunity) | |
842 | lcommunity_free(&new->lcommunity); | |
843 | ||
844 | } | |
845 | ||
718e3744 | 846 | /* Free bgp attribute and aspath. */ |
d62a17ae | 847 | void bgp_attr_unintern(struct attr **pattr) |
848 | { | |
849 | struct attr *attr = *pattr; | |
850 | struct attr *ret; | |
851 | struct attr tmp; | |
852 | ||
853 | /* Decrement attribute reference. */ | |
854 | attr->refcnt--; | |
855 | ||
856 | tmp = *attr; | |
857 | ||
858 | /* If reference becomes zero then free attribute object. */ | |
859 | if (attr->refcnt == 0) { | |
860 | ret = hash_release(attrhash, attr); | |
861 | assert(ret != NULL); | |
862 | XFREE(MTYPE_ATTR, attr); | |
863 | *pattr = NULL; | |
864 | } | |
865 | ||
866 | bgp_attr_unintern_sub(&tmp); | |
867 | } | |
868 | ||
869 | void bgp_attr_flush(struct attr *attr) | |
870 | { | |
871 | if (attr->aspath && !attr->aspath->refcnt) { | |
872 | aspath_free(attr->aspath); | |
873 | attr->aspath = NULL; | |
874 | } | |
875 | if (attr->community && !attr->community->refcnt) { | |
876 | community_free(attr->community); | |
877 | attr->community = NULL; | |
878 | } | |
879 | ||
880 | if (attr->ecommunity && !attr->ecommunity->refcnt) | |
881 | ecommunity_free(&attr->ecommunity); | |
882 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
883 | lcommunity_free(&attr->lcommunity); | |
884 | if (attr->cluster && !attr->cluster->refcnt) { | |
885 | cluster_free(attr->cluster); | |
886 | attr->cluster = NULL; | |
887 | } | |
888 | if (attr->transit && !attr->transit->refcnt) { | |
889 | transit_free(attr->transit); | |
890 | attr->transit = NULL; | |
891 | } | |
892 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
893 | encap_free(attr->encap_subtlvs); | |
894 | attr->encap_subtlvs = NULL; | |
895 | } | |
65efcfce | 896 | #if ENABLE_BGP_VNC |
d62a17ae | 897 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
898 | encap_free(attr->vnc_subtlvs); | |
899 | attr->vnc_subtlvs = NULL; | |
900 | } | |
aadc0905 | 901 | #endif |
718e3744 | 902 | } |
903 | ||
b881c707 PJ |
904 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
905 | * avoid resetting sessions for malformed attributes which are | |
906 | * are partial/optional and hence where the error likely was not | |
907 | * introduced by the sending neighbour. | |
908 | */ | |
909 | static bgp_attr_parse_ret_t | |
d62a17ae | 910 | bgp_attr_malformed(struct bgp_attr_parser_args *args, u_char subcode, |
911 | bgp_size_t length) | |
912 | { | |
913 | struct peer *const peer = args->peer; | |
914 | const u_int8_t flags = args->flags; | |
915 | /* startp and length must be special-cased, as whether or not to | |
916 | * send the attribute data with the NOTIFY depends on the error, | |
917 | * the caller therefore signals this with the seperate length argument | |
918 | */ | |
919 | u_char *notify_datap = (length > 0 ? args->startp : NULL); | |
920 | ||
921 | /* Only relax error handling for eBGP peers */ | |
922 | if (peer->sort != BGP_PEER_EBGP) { | |
923 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
924 | notify_datap, length); | |
925 | return BGP_ATTR_PARSE_ERROR; | |
926 | } | |
927 | ||
928 | /* Adjust the stream getp to the end of the attribute, in case we can | |
929 | * still proceed but the caller hasn't read all the attribute. | |
930 | */ | |
931 | stream_set_getp(BGP_INPUT(peer), | |
932 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
933 | + args->total); | |
934 | ||
935 | switch (args->type) { | |
936 | /* where an attribute is relatively inconsequential, e.g. it does not | |
937 | * affect route selection, and can be safely ignored, then any such | |
938 | * attributes which are malformed should just be ignored and the route | |
939 | * processed as normal. | |
940 | */ | |
941 | case BGP_ATTR_AS4_AGGREGATOR: | |
942 | case BGP_ATTR_AGGREGATOR: | |
943 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
944 | return BGP_ATTR_PARSE_PROCEED; | |
945 | ||
946 | /* Core attributes, particularly ones which may influence route | |
947 | * selection, should always cause session resets | |
948 | */ | |
949 | case BGP_ATTR_ORIGIN: | |
950 | case BGP_ATTR_AS_PATH: | |
951 | case BGP_ATTR_NEXT_HOP: | |
952 | case BGP_ATTR_MULTI_EXIT_DISC: | |
953 | case BGP_ATTR_LOCAL_PREF: | |
954 | case BGP_ATTR_COMMUNITIES: | |
955 | case BGP_ATTR_ORIGINATOR_ID: | |
956 | case BGP_ATTR_CLUSTER_LIST: | |
957 | case BGP_ATTR_MP_REACH_NLRI: | |
958 | case BGP_ATTR_MP_UNREACH_NLRI: | |
959 | case BGP_ATTR_EXT_COMMUNITIES: | |
960 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
961 | notify_datap, length); | |
962 | return BGP_ATTR_PARSE_ERROR; | |
963 | } | |
964 | ||
965 | /* Partial optional attributes that are malformed should not cause | |
966 | * the whole session to be reset. Instead treat it as a withdrawal | |
967 | * of the routes, if possible. | |
968 | */ | |
969 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
970 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
971 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
972 | return BGP_ATTR_PARSE_WITHDRAW; | |
973 | ||
974 | /* default to reset */ | |
975 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
976 | } |
977 | ||
afcb7679 DO |
978 | /* Find out what is wrong with the path attribute flag bits and log the error. |
979 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
980 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
981 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
982 | non-transitive" attribute. */ | |
983 | static void | |
d62a17ae | 984 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
985 | u_int8_t desired_flags /* how RFC says it must be */ | |
9d303b37 | 986 | ) |
d62a17ae | 987 | { |
988 | u_char seen = 0, i; | |
989 | u_char real_flags = args->flags; | |
990 | const u_int8_t attr_code = args->type; | |
991 | ||
992 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
993 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
994 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
995 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
996 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
997 | zlog_err("%s attribute must%s be flagged as \"%s\"", | |
998 | lookup_msg(attr_str, attr_code, NULL), | |
999 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1000 | ? "" | |
1001 | : " not", | |
1002 | attr_flag_str[i].str); | |
1003 | seen = 1; | |
1004 | } | |
1005 | if (!seen) { | |
1006 | zlog_debug( | |
1007 | "Strange, %s called for attr %s, but no problem found with flags" | |
1008 | " (real flags 0x%x, desired 0x%x)", | |
1009 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
1010 | real_flags, desired_flags); | |
1011 | } | |
afcb7679 DO |
1012 | } |
1013 | ||
3ecab4c8 PJ |
1014 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1015 | * as will PARTIAL for optional+transitive attributes. | |
1016 | */ | |
d62a17ae | 1017 | const u_int8_t attr_flags_values[] = { |
9d303b37 DL |
1018 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, |
1019 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1020 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1021 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1022 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1023 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1024 | [BGP_ATTR_AGGREGATOR] = | |
1025 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1026 | [BGP_ATTR_COMMUNITIES] = | |
1027 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1028 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1029 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1030 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1031 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1032 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1033 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1034 | [BGP_ATTR_AS4_PATH] = | |
1035 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1036 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1037 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
a21bd7a3 DW |
1038 | [BGP_ATTR_PMSI_TUNNEL] = |
1039 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
9d303b37 DL |
1040 | [BGP_ATTR_LARGE_COMMUNITIES] = |
1041 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1042 | [BGP_ATTR_PREFIX_SID] = | |
1043 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1044 | }; |
099111ef | 1045 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1046 | |
d62a17ae | 1047 | static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
1048 | { | |
1049 | u_int8_t mask = BGP_ATTR_FLAG_EXTLEN; | |
1050 | const u_int8_t flags = args->flags; | |
1051 | const u_int8_t attr_code = args->type; | |
1052 | ||
1053 | /* there may be attributes we don't know about */ | |
1054 | if (attr_code > attr_flags_values_max) | |
1055 | return 0; | |
1056 | if (attr_flags_values[attr_code] == 0) | |
1057 | return 0; | |
1058 | ||
1059 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1060 | * to | |
1061 | * 1." | |
1062 | */ | |
1063 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1064 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
1065 | zlog_err( | |
1066 | "%s well-known attributes must have transitive flag set (%x)", | |
1067 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1068 | return 1; | |
1069 | } | |
1070 | ||
1071 | /* "For well-known attributes and for optional non-transitive | |
1072 | * attributes, | |
1073 | * the Partial bit MUST be set to 0." | |
1074 | */ | |
1075 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1076 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
1077 | zlog_err( | |
1078 | "%s well-known attribute " | |
1079 | "must NOT have the partial flag set (%x)", | |
1080 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1081 | return 1; | |
1082 | } | |
1083 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1084 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
1085 | zlog_err( | |
1086 | "%s optional + transitive attribute " | |
1087 | "must NOT have the partial flag set (%x)", | |
1088 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1089 | return 1; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* Optional transitive attributes may go through speakers that don't | |
1094 | * reocgnise them and set the Partial bit. | |
1095 | */ | |
1096 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1097 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1098 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1099 | ||
1100 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1101 | return 0; | |
1102 | ||
1103 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1104 | return 1; | |
3ecab4c8 PJ |
1105 | } |
1106 | ||
718e3744 | 1107 | /* Get origin attribute of the update message. */ |
d62a17ae | 1108 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1109 | { | |
1110 | struct peer *const peer = args->peer; | |
1111 | struct attr *const attr = args->attr; | |
1112 | const bgp_size_t length = args->length; | |
1113 | ||
1114 | /* If any recognized attribute has Attribute Length that conflicts | |
1115 | with the expected length (based on the attribute type code), then | |
1116 | the Error Subcode is set to Attribute Length Error. The Data | |
1117 | field contains the erroneous attribute (type, length and | |
1118 | value). */ | |
1119 | if (length != 1) { | |
1120 | zlog_err("Origin attribute length is not one %d", length); | |
1121 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1122 | args->total); | |
1123 | } | |
1124 | ||
1125 | /* Fetch origin attribute. */ | |
1126 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1127 | ||
1128 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1129 | Subcode is set to Invalid Origin Attribute. The Data field | |
1130 | contains the unrecognized attribute (type, length and value). */ | |
1131 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1132 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
1133 | zlog_err("Origin attribute value is invalid %d", attr->origin); | |
1134 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
1135 | args->total); | |
1136 | } | |
1137 | ||
1138 | /* Set oring attribute flag. */ | |
1139 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1140 | ||
1141 | return 0; | |
718e3744 | 1142 | } |
ab005298 PJ |
1143 | |
1144 | /* Parse AS path information. This function is wrapper of | |
1145 | aspath_parse. */ | |
d62a17ae | 1146 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1147 | { | |
1148 | struct attr *const attr = args->attr; | |
1149 | struct peer *const peer = args->peer; | |
1150 | const bgp_size_t length = args->length; | |
1151 | ||
1152 | /* | |
1153 | * peer with AS4 => will get 4Byte ASnums | |
1154 | * otherwise, will get 16 Bit | |
1155 | */ | |
424ab01d | 1156 | attr->aspath = aspath_parse(peer->curr, length, |
d62a17ae | 1157 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); |
1158 | ||
1159 | /* In case of IBGP, length will be zero. */ | |
1160 | if (!attr->aspath) { | |
1161 | zlog_err("Malformed AS path from %s, length is %d", peer->host, | |
1162 | length); | |
1163 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1164 | 0); | |
1165 | } | |
0b2aa3a0 | 1166 | |
d62a17ae | 1167 | /* Set aspath attribute flag. */ |
1168 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1169 | ||
1170 | return BGP_ATTR_PARSE_PROCEED; | |
1171 | } | |
1172 | ||
1173 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1174 | struct attr *const attr) | |
1175 | { | |
1176 | /* These checks were part of bgp_attr_aspath, but with | |
1177 | * as4 we should to check aspath things when | |
1178 | * aspath synthesizing with as4_path has already taken place. | |
1179 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1180 | * not right. | |
1181 | * So do the checks later, i.e. here | |
1182 | */ | |
1183 | struct bgp *bgp = peer->bgp; | |
1184 | struct aspath *aspath; | |
1185 | ||
1186 | /* Confederation sanity check. */ | |
1187 | if ((peer->sort == BGP_PEER_CONFED | |
1188 | && !aspath_left_confed_check(attr->aspath)) | |
1189 | || (peer->sort == BGP_PEER_EBGP | |
1190 | && aspath_confed_check(attr->aspath))) { | |
1191 | zlog_err("Malformed AS path from %s", peer->host); | |
1192 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1193 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1194 | return BGP_ATTR_PARSE_ERROR; | |
1195 | } | |
cddb8112 | 1196 | |
d62a17ae | 1197 | /* First AS check for EBGP. */ |
1198 | if (bgp != NULL && bgp_flag_check(bgp, BGP_FLAG_ENFORCE_FIRST_AS)) { | |
1199 | if (peer->sort == BGP_PEER_EBGP | |
1200 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
1201 | zlog_err("%s incorrect first AS (must be %u)", | |
1202 | peer->host, peer->as); | |
1203 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1204 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1205 | return BGP_ATTR_PARSE_ERROR; | |
1206 | } | |
1207 | } | |
0b2aa3a0 | 1208 | |
d62a17ae | 1209 | /* local-as prepend */ |
1210 | if (peer->change_local_as | |
1211 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1212 | aspath = aspath_dup(attr->aspath); | |
1213 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1214 | aspath_unintern(&attr->aspath); | |
1215 | attr->aspath = aspath_intern(aspath); | |
1216 | } | |
0b2aa3a0 | 1217 | |
d62a17ae | 1218 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1219 | } |
1220 | ||
ab005298 PJ |
1221 | /* Parse AS4 path information. This function is another wrapper of |
1222 | aspath_parse. */ | |
d62a17ae | 1223 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1224 | struct aspath **as4_path) | |
ab005298 | 1225 | { |
d62a17ae | 1226 | struct peer *const peer = args->peer; |
1227 | struct attr *const attr = args->attr; | |
1228 | const bgp_size_t length = args->length; | |
ab005298 | 1229 | |
424ab01d | 1230 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1231 | |
d62a17ae | 1232 | /* In case of IBGP, length will be zero. */ |
1233 | if (!*as4_path) { | |
1234 | zlog_err("Malformed AS4 path from %s, length is %d", peer->host, | |
1235 | length); | |
1236 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1237 | 0); | |
1238 | } | |
ab005298 | 1239 | |
d62a17ae | 1240 | /* Set aspath attribute flag. */ |
1241 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1242 | ||
1243 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1244 | } |
1245 | ||
718e3744 | 1246 | /* Nexthop attribute. */ |
d62a17ae | 1247 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1248 | { | |
1249 | struct peer *const peer = args->peer; | |
1250 | struct attr *const attr = args->attr; | |
1251 | const bgp_size_t length = args->length; | |
1252 | ||
1253 | in_addr_t nexthop_h, nexthop_n; | |
1254 | ||
1255 | /* Check nexthop attribute length. */ | |
1256 | if (length != 4) { | |
1257 | zlog_err("Nexthop attribute length isn't four [%d]", length); | |
1258 | ||
1259 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1260 | args->total); | |
1261 | } | |
1262 | ||
1263 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP | |
1264 | attribute must result in a NOTIFICATION message (this is implemented | |
1265 | below). | |
1266 | At the same time, semantically incorrect NEXT_HOP is more likely to | |
1267 | be just | |
1268 | logged locally (this is implemented somewhere else). The UPDATE | |
1269 | message | |
1270 | gets ignored in any of these cases. */ | |
424ab01d | 1271 | nexthop_n = stream_get_ipv4(peer->curr); |
d62a17ae | 1272 | nexthop_h = ntohl(nexthop_n); |
1273 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1274 | || IPV4_CLASS_DE(nexthop_h)) | |
1275 | && !BGP_DEBUG( | |
1276 | allow_martians, | |
1277 | ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
1278 | { | |
1279 | char buf[INET_ADDRSTRLEN]; | |
1280 | inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); | |
1281 | zlog_err("Martian nexthop %s", buf); | |
1282 | return bgp_attr_malformed( | |
1283 | args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total); | |
1284 | } | |
1285 | ||
1286 | attr->nexthop.s_addr = nexthop_n; | |
1287 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1288 | ||
1289 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1290 | } |
1291 | ||
1292 | /* MED atrribute. */ | |
d62a17ae | 1293 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1294 | { |
d62a17ae | 1295 | struct peer *const peer = args->peer; |
1296 | struct attr *const attr = args->attr; | |
1297 | const bgp_size_t length = args->length; | |
b881c707 | 1298 | |
d62a17ae | 1299 | /* Length check. */ |
1300 | if (length != 4) { | |
1301 | zlog_err("MED attribute length isn't four [%d]", length); | |
718e3744 | 1302 | |
d62a17ae | 1303 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1304 | args->total); | |
1305 | } | |
1306 | ||
424ab01d | 1307 | attr->med = stream_getl(peer->curr); |
718e3744 | 1308 | |
d62a17ae | 1309 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1310 | |
d62a17ae | 1311 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1312 | } |
1313 | ||
1314 | /* Local preference attribute. */ | |
b881c707 | 1315 | static bgp_attr_parse_ret_t |
d62a17ae | 1316 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1317 | { | |
1318 | struct peer *const peer = args->peer; | |
1319 | struct attr *const attr = args->attr; | |
1320 | const bgp_size_t length = args->length; | |
1321 | ||
1322 | /* Length check. */ | |
1323 | if (length != 4) { | |
1324 | zlog_err("LOCAL_PREF attribute length isn't 4 [%u]", length); | |
1325 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1326 | args->total); | |
1327 | } | |
1328 | ||
1329 | /* If it is contained in an UPDATE message that is received from an | |
1330 | external peer, then this attribute MUST be ignored by the | |
1331 | receiving speaker. */ | |
1332 | if (peer->sort == BGP_PEER_EBGP) { | |
424ab01d | 1333 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1334 | return BGP_ATTR_PARSE_PROCEED; |
1335 | } | |
1336 | ||
424ab01d | 1337 | attr->local_pref = stream_getl(peer->curr); |
d62a17ae | 1338 | |
7f323236 | 1339 | /* Set the local-pref flag. */ |
d62a17ae | 1340 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1341 | ||
1342 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1343 | } |
1344 | ||
1345 | /* Atomic aggregate. */ | |
d62a17ae | 1346 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1347 | { |
d62a17ae | 1348 | struct attr *const attr = args->attr; |
1349 | const bgp_size_t length = args->length; | |
1350 | ||
1351 | /* Length check. */ | |
1352 | if (length != 0) { | |
1353 | zlog_err("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", | |
1354 | length); | |
1355 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1356 | args->total); | |
1357 | } | |
718e3744 | 1358 | |
d62a17ae | 1359 | /* Set atomic aggregate flag. */ |
1360 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1361 | |
d62a17ae | 1362 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1363 | } |
1364 | ||
1365 | /* Aggregator attribute */ | |
d62a17ae | 1366 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1367 | { | |
1368 | struct peer *const peer = args->peer; | |
1369 | struct attr *const attr = args->attr; | |
1370 | const bgp_size_t length = args->length; | |
1371 | ||
1372 | int wantedlen = 6; | |
1373 | ||
1374 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1375 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1376 | wantedlen = 8; | |
1377 | ||
1378 | if (length != wantedlen) { | |
1379 | zlog_err("AGGREGATOR attribute length isn't %u [%u]", wantedlen, | |
1380 | length); | |
1381 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1382 | args->total); | |
1383 | } | |
1384 | ||
1385 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
424ab01d | 1386 | attr->aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1387 | else |
424ab01d QY |
1388 | attr->aggregator_as = stream_getw(peer->curr); |
1389 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1390 | |
1391 | /* Set atomic aggregate flag. */ | |
1392 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1393 | ||
1394 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1395 | } |
1396 | ||
0b2aa3a0 | 1397 | /* New Aggregator attribute */ |
b881c707 | 1398 | static bgp_attr_parse_ret_t |
d62a17ae | 1399 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1400 | as_t *as4_aggregator_as, | |
1401 | struct in_addr *as4_aggregator_addr) | |
1402 | { | |
1403 | struct peer *const peer = args->peer; | |
1404 | struct attr *const attr = args->attr; | |
1405 | const bgp_size_t length = args->length; | |
1406 | ||
1407 | if (length != 8) { | |
1408 | zlog_err("New Aggregator length is not 8 [%d]", length); | |
1409 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1410 | 0); | |
1411 | } | |
1412 | ||
424ab01d QY |
1413 | *as4_aggregator_as = stream_getl(peer->curr); |
1414 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1415 | |
1416 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1417 | ||
1418 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1419 | } |
1420 | ||
1421 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1422 | */ | |
b881c707 | 1423 | static bgp_attr_parse_ret_t |
d62a17ae | 1424 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1425 | struct aspath *as4_path, as_t as4_aggregator, | |
1426 | struct in_addr *as4_aggregator_addr) | |
1427 | { | |
1428 | int ignore_as4_path = 0; | |
1429 | struct aspath *newpath; | |
1430 | ||
1431 | if (!attr->aspath) { | |
1432 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1433 | * have | |
1434 | * checked that all well-known, mandatory attributes were | |
1435 | * present. | |
1436 | * | |
1437 | * Can only be a problem with peer itself - hard error | |
1438 | */ | |
1439 | return BGP_ATTR_PARSE_ERROR; | |
1440 | } | |
1441 | ||
1442 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1443 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1444 | * if given. | |
1445 | * It is worth a warning though, because the peer really | |
1446 | * should not send them | |
1447 | */ | |
1448 | if (BGP_DEBUG(as4, AS4)) { | |
1449 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1450 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1451 | "AS4 capable peer, yet it sent"); | |
1452 | ||
1453 | if (attr->flag | |
1454 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1455 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1456 | peer->host, | |
1457 | "AS4 capable peer, yet it sent"); | |
1458 | } | |
1459 | ||
1460 | return BGP_ATTR_PARSE_PROCEED; | |
1461 | } | |
1462 | ||
1463 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1464 | * because that may override AS4_PATH | |
1465 | */ | |
1466 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1467 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1468 | /* received both. | |
1469 | * if the as_number in aggregator is not AS_TRANS, | |
1470 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1471 | * and the Aggregator shall be taken as | |
1472 | * info on the aggregating node, and the AS_PATH | |
1473 | * shall be taken as the AS_PATH | |
1474 | * otherwise | |
1475 | * the Aggregator shall be ignored and the | |
1476 | * AS4_AGGREGATOR shall be taken as the | |
1477 | * Aggregating node and the AS_PATH is to be | |
1478 | * constructed "as in all other cases" | |
1479 | */ | |
1480 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1481 | /* ignore */ | |
1482 | if (BGP_DEBUG(as4, AS4)) | |
1483 | zlog_debug( | |
1484 | "[AS4] %s BGP not AS4 capable peer" | |
1485 | " send AGGREGATOR != AS_TRANS and" | |
1486 | " AS4_AGGREGATOR, so ignore" | |
1487 | " AS4_AGGREGATOR and AS4_PATH", | |
1488 | peer->host); | |
1489 | ignore_as4_path = 1; | |
1490 | } else { | |
1491 | /* "New_aggregator shall be taken as aggregator" | |
1492 | */ | |
1493 | attr->aggregator_as = as4_aggregator; | |
1494 | attr->aggregator_addr.s_addr = | |
1495 | as4_aggregator_addr->s_addr; | |
1496 | } | |
1497 | } else { | |
1498 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1499 | * That is bogus - but reading the conditions | |
1500 | * we have to handle AS4_AGGREGATOR as if it were | |
1501 | * AGGREGATOR in that case | |
1502 | */ | |
1503 | if (BGP_DEBUG(as4, AS4)) | |
1504 | zlog_debug( | |
1505 | "[AS4] %s BGP not AS4 capable peer send" | |
1506 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1507 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1508 | peer->host); | |
1509 | attr->aggregator_as = as4_aggregator; | |
1510 | /* sweep it under the carpet and simulate a "good" | |
1511 | * AGGREGATOR */ | |
1512 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1517 | if (!ignore_as4_path | |
1518 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1519 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
1520 | aspath_unintern(&attr->aspath); | |
1521 | attr->aspath = aspath_intern(newpath); | |
1522 | } | |
1523 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1524 | } |
1525 | ||
718e3744 | 1526 | /* Community attribute. */ |
b881c707 | 1527 | static bgp_attr_parse_ret_t |
d62a17ae | 1528 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1529 | { | |
1530 | struct peer *const peer = args->peer; | |
1531 | struct attr *const attr = args->attr; | |
1532 | const bgp_size_t length = args->length; | |
1533 | ||
1534 | if (length == 0) { | |
1535 | attr->community = NULL; | |
1536 | return BGP_ATTR_PARSE_PROCEED; | |
1537 | } | |
1538 | ||
1539 | attr->community = | |
424ab01d | 1540 | community_parse((u_int32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1541 | |
1542 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1543 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1544 | |
1545 | if (!attr->community) | |
1546 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1547 | args->total); | |
1548 | ||
1549 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1550 | ||
1551 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1552 | } |
1553 | ||
1554 | /* Originator ID attribute. */ | |
b881c707 | 1555 | static bgp_attr_parse_ret_t |
d62a17ae | 1556 | bgp_attr_originator_id(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; | |
718e3744 | 1561 | |
d62a17ae | 1562 | /* Length check. */ |
1563 | if (length != 4) { | |
1564 | zlog_err("Bad originator ID length %d", length); | |
718e3744 | 1565 | |
d62a17ae | 1566 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1567 | args->total); | |
1568 | } | |
1569 | ||
424ab01d | 1570 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1571 | |
d62a17ae | 1572 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1573 | |
d62a17ae | 1574 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1575 | } |
1576 | ||
1577 | /* Cluster list attribute. */ | |
b881c707 | 1578 | static bgp_attr_parse_ret_t |
d62a17ae | 1579 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1580 | { |
d62a17ae | 1581 | struct peer *const peer = args->peer; |
1582 | struct attr *const attr = args->attr; | |
1583 | const bgp_size_t length = args->length; | |
1584 | ||
1585 | /* Check length. */ | |
1586 | if (length % 4) { | |
1587 | zlog_err("Bad cluster list length %d", length); | |
718e3744 | 1588 | |
d62a17ae | 1589 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1590 | args->total); | |
1591 | } | |
1592 | ||
1593 | attr->cluster = | |
424ab01d | 1594 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); |
718e3744 | 1595 | |
d62a17ae | 1596 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 1597 | stream_forward_getp(peer->curr, length); |
718e3744 | 1598 | |
d62a17ae | 1599 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1600 | |
d62a17ae | 1601 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1602 | } |
1603 | ||
1604 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1605 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1606 | struct bgp_nlri *mp_update) | |
1607 | { | |
1608 | iana_afi_t pkt_afi; | |
1609 | afi_t afi; | |
5c525538 RW |
1610 | iana_safi_t pkt_safi; |
1611 | safi_t safi; | |
d62a17ae | 1612 | bgp_size_t nlri_len; |
1613 | size_t start; | |
1614 | struct stream *s; | |
1615 | struct peer *const peer = args->peer; | |
1616 | struct attr *const attr = args->attr; | |
1617 | const bgp_size_t length = args->length; | |
1618 | ||
1619 | /* Set end of packet. */ | |
1620 | s = BGP_INPUT(peer); | |
1621 | start = stream_get_getp(s); | |
1622 | ||
1623 | /* safe to read statically sized header? */ | |
6e4ab12f | 1624 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1625 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1626 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
1627 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1628 | peer->host, (unsigned long)length); | |
1629 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1630 | } | |
1631 | ||
1632 | /* Load AFI, SAFI. */ | |
1633 | pkt_afi = stream_getw(s); | |
1634 | pkt_safi = stream_getc(s); | |
1635 | ||
1636 | /* Convert AFI, SAFI to internal values, check. */ | |
1637 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1638 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1639 | * unless | |
1640 | * the attribute is otherwise malformed. | |
1641 | */ | |
1642 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1643 | zlog_debug( | |
1644 | "%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1645 | peer->host, pkt_afi, pkt_safi); | |
1646 | return BGP_ATTR_PARSE_ERROR; | |
1647 | } | |
1648 | ||
1649 | /* Get nexthop length. */ | |
1650 | attr->mp_nexthop_len = stream_getc(s); | |
1651 | ||
1652 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1653 | zlog_info( | |
1654 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1655 | __func__, peer->host, attr->mp_nexthop_len); | |
1656 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1657 | } | |
1658 | ||
1659 | /* Nexthop length check. */ | |
1660 | switch (attr->mp_nexthop_len) { | |
b6453163 LB |
1661 | case BGP_ATTR_NHLEN_VPNV4: |
1662 | stream_getl(s); /* RD high */ | |
1663 | stream_getl(s); /* RD low */ | |
e1541bf6 LB |
1664 | /* |
1665 | * NOTE: intentional fall through | |
1666 | * - for consistency in rx processing | |
176b3050 MW |
1667 | * |
1668 | * The following comment is to signal GCC this intention | |
1669 | * and supress the warning | |
e1541bf6 | 1670 | */ |
176b3050 | 1671 | /* FALLTHRU */ |
d62a17ae | 1672 | case BGP_ATTR_NHLEN_IPV4: |
1673 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1674 | /* Probably needed for RFC 2283 */ | |
1675 | if (attr->nexthop.s_addr == 0) | |
1676 | memcpy(&attr->nexthop.s_addr, | |
1677 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1678 | break; | |
d62a17ae | 1679 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
1680 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1681 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1682 | stream_getl(s); /* RD high */ | |
1683 | stream_getl(s); /* RD low */ | |
1684 | } | |
1685 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1686 | break; | |
1687 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1688 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1689 | if (attr->mp_nexthop_len | |
1690 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1691 | stream_getl(s); /* RD high */ | |
1692 | stream_getl(s); /* RD low */ | |
1693 | } | |
1694 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
1695 | if (attr->mp_nexthop_len | |
1696 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1697 | stream_getl(s); /* RD high */ | |
1698 | stream_getl(s); /* RD low */ | |
1699 | } | |
1700 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1701 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1702 | char buf1[INET6_ADDRSTRLEN]; | |
1703 | char buf2[INET6_ADDRSTRLEN]; | |
1704 | ||
1705 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1706 | zlog_debug( | |
1707 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1708 | peer->host, | |
1709 | inet_ntop(AF_INET6, | |
1710 | &attr->mp_nexthop_global, | |
1711 | buf1, INET6_ADDRSTRLEN), | |
1712 | inet_ntop(AF_INET6, | |
1713 | &attr->mp_nexthop_local, buf2, | |
1714 | INET6_ADDRSTRLEN)); | |
1715 | ||
1716 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1717 | } | |
1718 | break; | |
1719 | default: | |
1720 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1721 | __func__, peer->host, attr->mp_nexthop_len); | |
1722 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1723 | } | |
1724 | ||
1725 | if (!LEN_LEFT) { | |
1726 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1727 | peer->host); | |
1728 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1729 | } | |
1730 | ||
718e3744 | 1731 | { |
d62a17ae | 1732 | u_char val; |
1733 | if ((val = stream_getc(s))) | |
1734 | zlog_warn( | |
1735 | "%s sent non-zero value, %u, for defunct SNPA-length field", | |
1736 | peer->host, val); | |
1737 | } | |
1738 | ||
1739 | /* must have nrli_len, what is left of the attribute */ | |
1740 | nlri_len = LEN_LEFT; | |
9b9df989 | 1741 | if (nlri_len > STREAM_READABLE(s)) { |
d62a17ae | 1742 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); |
1743 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1744 | } | |
1745 | ||
9b9df989 DS |
1746 | if (!nlri_len) { |
1747 | zlog_info("%s: (%s) No Reachability, Treating as a EOR marker", | |
1748 | __func__, peer->host); | |
1749 | ||
1750 | mp_update->afi = afi; | |
1751 | mp_update->safi = safi; | |
1752 | return BGP_ATTR_PARSE_EOR; | |
1753 | } | |
1754 | ||
d62a17ae | 1755 | mp_update->afi = afi; |
1756 | mp_update->safi = safi; | |
1757 | mp_update->nlri = stream_pnt(s); | |
1758 | mp_update->length = nlri_len; | |
1759 | ||
1760 | stream_forward_getp(s, nlri_len); | |
1761 | ||
1762 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1763 | ||
1764 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 1765 | #undef LEN_LEFT |
718e3744 | 1766 | } |
1767 | ||
1768 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 1769 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
1770 | struct bgp_nlri *mp_withdraw) | |
1771 | { | |
1772 | struct stream *s; | |
1773 | iana_afi_t pkt_afi; | |
1774 | afi_t afi; | |
5c525538 RW |
1775 | iana_safi_t pkt_safi; |
1776 | safi_t safi; | |
d62a17ae | 1777 | u_int16_t withdraw_len; |
1778 | struct peer *const peer = args->peer; | |
1779 | struct attr *const attr = args->attr; | |
1780 | const bgp_size_t length = args->length; | |
9cabb64b | 1781 | |
424ab01d | 1782 | s = peer->curr; |
9cabb64b | 1783 | |
d62a17ae | 1784 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
1785 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1786 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1787 | ||
1788 | pkt_afi = stream_getw(s); | |
1789 | pkt_safi = stream_getc(s); | |
1790 | ||
1791 | /* Convert AFI, SAFI to internal values, check. */ | |
1792 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1793 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1794 | * unless | |
1795 | * the attribute is otherwise malformed. | |
1796 | */ | |
1797 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1798 | zlog_debug( | |
1799 | "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1800 | peer->host, pkt_afi, pkt_safi); | |
1801 | return BGP_ATTR_PARSE_ERROR; | |
1802 | } | |
718e3744 | 1803 | |
d62a17ae | 1804 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1805 | |
d62a17ae | 1806 | mp_withdraw->afi = afi; |
1807 | mp_withdraw->safi = safi; | |
1808 | mp_withdraw->nlri = stream_pnt(s); | |
1809 | mp_withdraw->length = withdraw_len; | |
718e3744 | 1810 | |
d62a17ae | 1811 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 1812 | |
d62a17ae | 1813 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
1814 | ||
1815 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1816 | } |
1817 | ||
57d187bc JS |
1818 | /* Large Community attribute. */ |
1819 | static bgp_attr_parse_ret_t | |
d62a17ae | 1820 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
1821 | { | |
1822 | struct peer *const peer = args->peer; | |
1823 | struct attr *const attr = args->attr; | |
1824 | const bgp_size_t length = args->length; | |
1825 | ||
1826 | /* | |
1827 | * Large community follows new attribute format. | |
1828 | */ | |
1829 | if (length == 0) { | |
1830 | attr->lcommunity = NULL; | |
1831 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1832 | return BGP_ATTR_PARSE_PROCEED; | |
1833 | } | |
57d187bc | 1834 | |
d62a17ae | 1835 | attr->lcommunity = |
424ab01d | 1836 | lcommunity_parse((u_int8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1837 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1838 | stream_forward_getp(peer->curr, length); |
57d187bc | 1839 | |
d62a17ae | 1840 | if (!attr->lcommunity) |
1841 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1842 | args->total); | |
57d187bc | 1843 | |
d62a17ae | 1844 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 1845 | |
d62a17ae | 1846 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
1847 | } |
1848 | ||
718e3744 | 1849 | /* Extended Community attribute. */ |
b881c707 | 1850 | static bgp_attr_parse_ret_t |
d62a17ae | 1851 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
1852 | { | |
1853 | struct peer *const peer = args->peer; | |
1854 | struct attr *const attr = args->attr; | |
1855 | const bgp_size_t length = args->length; | |
1856 | u_char sticky = 0; | |
1857 | ||
1858 | if (length == 0) { | |
1859 | attr->ecommunity = NULL; | |
1860 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1861 | return BGP_ATTR_PARSE_PROCEED; | |
1862 | } | |
1863 | ||
1864 | attr->ecommunity = | |
424ab01d | 1865 | ecommunity_parse((u_int8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1866 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1867 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1868 | |
1869 | if (!attr->ecommunity) | |
1870 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1871 | args->total); | |
1872 | ||
1873 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1874 | ||
1875 | /* Extract MAC mobility sequence number, if any. */ | |
1876 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1877 | attr->sticky = sticky; | |
1878 | ||
ead40654 MK |
1879 | /* Check if this is a Gateway MAC-IP advertisement */ |
1880 | attr->default_gw = bgp_attr_default_gw(attr); | |
1881 | ||
bc59a672 MK |
1882 | /* Extract the Rmac, if any */ |
1883 | bgp_attr_rmac(attr, &attr->rmac); | |
1884 | ||
d62a17ae | 1885 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1886 | } |
1887 | ||
f4c89855 | 1888 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 1889 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
1890 | bgp_size_t length, /* IN: attr's length field */ | |
1891 | struct attr *attr, /* IN: caller already allocated */ | |
1892 | u_char flag, /* IN: attr's flags field */ | |
1893 | u_char *startp) | |
1894 | { | |
1895 | bgp_size_t total; | |
d62a17ae | 1896 | uint16_t tunneltype = 0; |
1897 | ||
1898 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1899 | ||
1900 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1901 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1902 | zlog_info( | |
1903 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1904 | flag); | |
1905 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1906 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1907 | startp, total); | |
1908 | return -1; | |
1909 | } | |
1910 | ||
1911 | if (BGP_ATTR_ENCAP == type) { | |
1912 | /* read outer TLV type and length */ | |
1913 | uint16_t tlv_length; | |
1914 | ||
1915 | if (length < 4) { | |
1916 | zlog_info( | |
1917 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1918 | bgp_notify_send_with_data( | |
1919 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1920 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1921 | return -1; | |
1922 | } | |
1923 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
1924 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
1925 | length -= 4; | |
1926 | ||
1927 | if (tlv_length != length) { | |
1928 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
1929 | tlv_length, length); | |
1930 | } | |
1931 | } | |
1932 | ||
1933 | while (length >= 4) { | |
1934 | uint16_t subtype = 0; | |
1935 | uint16_t sublength = 0; | |
1936 | struct bgp_attr_encap_subtlv *tlv; | |
1937 | ||
1938 | if (BGP_ATTR_ENCAP == type) { | |
1939 | subtype = stream_getc(BGP_INPUT(peer)); | |
1940 | sublength = stream_getc(BGP_INPUT(peer)); | |
1941 | length -= 2; | |
65efcfce | 1942 | #if ENABLE_BGP_VNC |
d62a17ae | 1943 | } else { |
1944 | subtype = stream_getw(BGP_INPUT(peer)); | |
1945 | sublength = stream_getw(BGP_INPUT(peer)); | |
1946 | length -= 4; | |
65efcfce | 1947 | #endif |
d62a17ae | 1948 | } |
1949 | ||
1950 | if (sublength > length) { | |
1951 | zlog_info( | |
1952 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
1953 | sublength, length); | |
1954 | bgp_notify_send_with_data( | |
1955 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1956 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1957 | return -1; | |
1958 | } | |
1959 | ||
1960 | /* alloc and copy sub-tlv */ | |
1961 | /* TBD make sure these are freed when attributes are released */ | |
1962 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
12f70478 | 1963 | sizeof(struct bgp_attr_encap_subtlv) |
d62a17ae | 1964 | + sublength); |
1965 | tlv->type = subtype; | |
1966 | tlv->length = sublength; | |
424ab01d | 1967 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 1968 | length -= sublength; |
1969 | ||
1970 | /* attach tlv to encap chain */ | |
1971 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 1972 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1973 | for (stlv_last = attr->encap_subtlvs; |
1974 | stlv_last && stlv_last->next; | |
1975 | stlv_last = stlv_last->next) | |
1976 | ; | |
1977 | if (stlv_last) { | |
1978 | stlv_last->next = tlv; | |
1979 | } else { | |
1980 | attr->encap_subtlvs = tlv; | |
1981 | } | |
65efcfce | 1982 | #if ENABLE_BGP_VNC |
d62a17ae | 1983 | } else { |
e4002056 | 1984 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1985 | for (stlv_last = attr->vnc_subtlvs; |
1986 | stlv_last && stlv_last->next; | |
1987 | stlv_last = stlv_last->next) | |
1988 | ; | |
1989 | if (stlv_last) { | |
1990 | stlv_last->next = tlv; | |
1991 | } else { | |
1992 | attr->vnc_subtlvs = tlv; | |
1993 | } | |
aadc0905 | 1994 | #endif |
d62a17ae | 1995 | } |
d62a17ae | 1996 | } |
f4c89855 | 1997 | |
d62a17ae | 1998 | if (BGP_ATTR_ENCAP == type) { |
1999 | attr->encap_tunneltype = tunneltype; | |
2000 | } | |
f4c89855 | 2001 | |
d62a17ae | 2002 | if (length) { |
2003 | /* spurious leftover data */ | |
2004 | zlog_info( | |
2005 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2006 | length); | |
2007 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2008 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2009 | startp, total); | |
2010 | return -1; | |
2011 | } | |
f4c89855 | 2012 | |
d62a17ae | 2013 | return 0; |
f4c89855 LB |
2014 | } |
2015 | ||
c5a543b4 DW |
2016 | /* Prefix SID attribute |
2017 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2018 | */ | |
6cf48acc | 2019 | static bgp_attr_parse_ret_t |
d62a17ae | 2020 | bgp_attr_prefix_sid(struct bgp_attr_parser_args *args, |
2021 | struct bgp_nlri *mp_update) | |
2022 | { | |
2023 | struct peer *const peer = args->peer; | |
2024 | struct attr *const attr = args->attr; | |
2025 | int type; | |
2026 | int length; | |
2027 | u_int32_t label_index; | |
2028 | struct in6_addr ipv6_sid; | |
2029 | u_int32_t srgb_base; | |
2030 | u_int32_t srgb_range; | |
2031 | int srgb_count; | |
2032 | ||
2033 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2034 | ||
424ab01d QY |
2035 | type = stream_getc(peer->curr); |
2036 | length = stream_getw(peer->curr); | |
d62a17ae | 2037 | |
2038 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { | |
2039 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2040 | zlog_err( | |
2041 | "Prefix SID label index length is %d instead of %d", | |
2042 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
2043 | return bgp_attr_malformed( | |
2044 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2045 | args->total); | |
2046 | } | |
2047 | ||
2048 | /* Ignore flags and reserved */ | |
424ab01d QY |
2049 | stream_getc(peer->curr); |
2050 | stream_getw(peer->curr); | |
d62a17ae | 2051 | |
2052 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2053 | label_index = stream_getl(peer->curr); |
d62a17ae | 2054 | if (label_index == BGP_INVALID_LABEL_INDEX) |
2055 | return bgp_attr_malformed( | |
2056 | args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2057 | args->total); | |
2058 | ||
2059 | /* Store label index; subsequently, we'll check on | |
2060 | * address-family */ | |
2061 | attr->label_index = label_index; | |
2062 | ||
2063 | /* | |
2064 | * Ignore the Label index attribute unless received for | |
2065 | * labeled-unicast | |
2066 | * SAFI. | |
2067 | */ | |
2068 | if (!mp_update->length | |
2069 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2070 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2071 | } | |
2072 | ||
2073 | /* Placeholder code for the IPv6 SID type */ | |
2074 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2075 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
2076 | zlog_err("Prefix SID IPv6 length is %d instead of %d", | |
2077 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
2078 | return bgp_attr_malformed( | |
2079 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2080 | args->total); | |
2081 | } | |
2082 | ||
2083 | /* Ignore reserved */ | |
424ab01d QY |
2084 | stream_getc(peer->curr); |
2085 | stream_getw(peer->curr); | |
d62a17ae | 2086 | |
424ab01d | 2087 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2088 | } |
2089 | ||
2090 | /* Placeholder code for the Originator SRGB type */ | |
2091 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2092 | /* Ignore flags */ | |
424ab01d | 2093 | stream_getw(peer->curr); |
d62a17ae | 2094 | |
2095 | length -= 2; | |
2096 | ||
2097 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
2098 | zlog_err( | |
2099 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", | |
2100 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2101 | return bgp_attr_malformed( | |
2102 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2103 | args->total); | |
2104 | } | |
2105 | ||
2106 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2107 | ||
2108 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2109 | stream_get(&srgb_base, peer->curr, 3); |
2110 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2111 | } |
2112 | } | |
2113 | ||
2114 | return BGP_ATTR_PARSE_PROCEED; | |
6cf48acc VV |
2115 | } |
2116 | ||
718e3744 | 2117 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2118 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2119 | { | |
2120 | bgp_size_t total = args->total; | |
2121 | struct transit *transit; | |
2122 | struct peer *const peer = args->peer; | |
2123 | struct attr *const attr = args->attr; | |
2124 | u_char *const startp = args->startp; | |
2125 | const u_char type = args->type; | |
2126 | const u_char flag = args->flags; | |
2127 | const bgp_size_t length = args->length; | |
2128 | ||
2129 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2130 | zlog_debug( | |
2131 | "%s Unknown attribute is received (type %d, length %d)", | |
2132 | peer->host, type, length); | |
2133 | ||
2134 | /* Forward read pointer of input stream. */ | |
424ab01d | 2135 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2136 | |
2137 | /* If any of the mandatory well-known attributes are not recognized, | |
2138 | then the Error Subcode is set to Unrecognized Well-known | |
2139 | Attribute. The Data field contains the unrecognized attribute | |
2140 | (type, length and value). */ | |
2141 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2142 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2143 | args->total); | |
2144 | } | |
2145 | ||
2146 | /* Unrecognized non-transitive optional attributes must be quietly | |
2147 | ignored and not passed along to other BGP peers. */ | |
2148 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2149 | return BGP_ATTR_PARSE_PROCEED; | |
2150 | ||
2151 | /* If a path with recognized transitive optional attribute is | |
2152 | accepted and passed along to other BGP peers and the Partial bit | |
2153 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2154 | is not set back to 0 by the current AS. */ | |
2155 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2156 | ||
2157 | /* Store transitive attribute to the end of attr->transit. */ | |
2158 | if (!attr->transit) | |
2159 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2160 | ||
2161 | transit = attr->transit; | |
2162 | ||
2163 | if (transit->val) | |
2164 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2165 | transit->length + total); | |
2166 | else | |
2167 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2168 | ||
2169 | memcpy(transit->val + transit->length, startp, total); | |
2170 | transit->length += total; | |
2171 | ||
2172 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2173 | } |
2174 | ||
bb7bef14 | 2175 | /* Well-known attribute check. */ |
d62a17ae | 2176 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2177 | { | |
2178 | u_char type = 0; | |
2179 | ||
2180 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2181 | * empty UPDATE. */ | |
2182 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2183 | return BGP_ATTR_PARSE_PROCEED; | |
2184 | ||
2185 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2186 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2187 | are present, it should. Check for any other attribute being present | |
2188 | instead. | |
2189 | */ | |
2190 | if (attr->flag == ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)) | |
2191 | return BGP_ATTR_PARSE_PROCEED; | |
2192 | ||
2193 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2194 | type = BGP_ATTR_ORIGIN; | |
2195 | ||
2196 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2197 | type = BGP_ATTR_AS_PATH; | |
2198 | ||
2199 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2200 | * and | |
2201 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2202 | */ | |
2203 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2204 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2205 | type = BGP_ATTR_NEXT_HOP; | |
2206 | ||
2207 | if (peer->sort == BGP_PEER_IBGP | |
2208 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2209 | type = BGP_ATTR_LOCAL_PREF; | |
2210 | ||
2211 | if (type) { | |
2212 | zlog_warn("%s Missing well-known attribute %s.", peer->host, | |
2213 | lookup_msg(attr_str, type, NULL)); | |
2214 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2215 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2216 | 1); | |
2217 | return BGP_ATTR_PARSE_ERROR; | |
2218 | } | |
2219 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2220 | } |
2221 | ||
718e3744 | 2222 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2223 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2224 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2225 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2226 | struct bgp_nlri *mp_withdraw) | |
2227 | { | |
2228 | int ret; | |
2229 | u_char flag = 0; | |
2230 | u_char type = 0; | |
2231 | bgp_size_t length; | |
2232 | u_char *startp, *endp; | |
2233 | u_char *attr_endp; | |
2234 | u_char seen[BGP_ATTR_BITMAP_SIZE]; | |
2235 | /* we need the as4_path only until we have synthesized the as_path with | |
2236 | * it */ | |
2237 | /* same goes for as4_aggregator */ | |
2238 | struct aspath *as4_path = NULL; | |
2239 | as_t as4_aggregator = 0; | |
2240 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2241 | ||
2242 | /* Initialize bitmap. */ | |
2243 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2244 | ||
2245 | /* End pointer of BGP attribute. */ | |
2246 | endp = BGP_INPUT_PNT(peer) + size; | |
2247 | ||
2248 | /* Get attributes to the end of attribute length. */ | |
2249 | while (BGP_INPUT_PNT(peer) < endp) { | |
2250 | /* Check remaining length check.*/ | |
2251 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2252 | /* XXX warning: long int format, int arg (arg 5) */ | |
2253 | zlog_warn( | |
2254 | "%s: error BGP attribute length %lu is smaller than min len", | |
2255 | peer->host, | |
2256 | (unsigned long)(endp | |
2d34fb80 | 2257 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2258 | |
2259 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2260 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2261 | return BGP_ATTR_PARSE_ERROR; | |
2262 | } | |
718e3744 | 2263 | |
d62a17ae | 2264 | /* Fetch attribute flag and type. */ |
2265 | startp = BGP_INPUT_PNT(peer); | |
2266 | /* "The lower-order four bits of the Attribute Flags octet are | |
2267 | unused. They MUST be zero when sent and MUST be ignored when | |
2268 | received." */ | |
2269 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2270 | type = stream_getc(BGP_INPUT(peer)); | |
2271 | ||
2272 | /* Check whether Extended-Length applies and is in bounds */ | |
2273 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2274 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
2275 | zlog_warn( | |
2276 | "%s: Extended length set, but just %lu bytes of attr header", | |
2277 | peer->host, | |
2278 | (unsigned long)(endp | |
2d34fb80 | 2279 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2280 | |
2281 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2282 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2283 | return BGP_ATTR_PARSE_ERROR; | |
2284 | } | |
718e3744 | 2285 | |
d62a17ae | 2286 | /* Check extended attribue length bit. */ |
2287 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2288 | length = stream_getw(BGP_INPUT(peer)); | |
2289 | else | |
2290 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2291 | |
d62a17ae | 2292 | /* If any attribute appears more than once in the UPDATE |
2293 | message, then the Error Subcode is set to Malformed Attribute | |
2294 | List. */ | |
718e3744 | 2295 | |
d62a17ae | 2296 | if (CHECK_BITMAP(seen, type)) { |
2297 | zlog_warn( | |
2298 | "%s: error BGP attribute type %d appears twice in a message", | |
2299 | peer->host, type); | |
718e3744 | 2300 | |
d62a17ae | 2301 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2302 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2303 | return BGP_ATTR_PARSE_ERROR; | |
2304 | } | |
2305 | ||
2306 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2307 | unsigned char so it never overflow bitmap range. */ | |
2308 | ||
2309 | SET_BITMAP(seen, type); | |
2310 | ||
2311 | /* Overflow check. */ | |
2312 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2313 | ||
2314 | if (attr_endp > endp) { | |
2315 | zlog_warn( | |
2316 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", | |
2317 | peer->host, type, length, size, attr_endp, | |
2318 | endp); | |
dacffad4 QY |
2319 | /* |
2320 | * RFC 4271 6.3 | |
2321 | * If any recognized attribute has an Attribute | |
2322 | * Length that conflicts with the expected length | |
2323 | * (based on the attribute type code), then the | |
2324 | * Error Subcode MUST be set to Attribute Length | |
2325 | * Error. The Data field MUST contain the erroneous | |
2326 | * attribute (type, length, and value). | |
2327 | * ---------- | |
2328 | * We do not currently have a good way to determine the | |
2329 | * length of the attribute independent of the length | |
2330 | * received in the message. Instead we send the | |
2331 | * minimum between the amount of data we have and the | |
2332 | * amount specified by the attribute length field. | |
2333 | * | |
2334 | * Instead of directly passing in the packet buffer and | |
2335 | * offset we use the stream_get* functions to read into | |
2336 | * a stack buffer, since they perform bounds checking | |
2337 | * and we are working with untrusted data. | |
2338 | */ | |
2339 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
2340 | memset(ndata, 0x00, sizeof(ndata)); | |
2341 | size_t lfl = | |
2342 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
2343 | /* Rewind to end of flag field */ | |
2344 | stream_forward_getp(BGP_INPUT(peer), -(1 + lfl)); | |
2345 | /* Type */ | |
2346 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
2347 | /* Length */ | |
2348 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
2349 | /* Value */ | |
2350 | size_t atl = attr_endp - startp; | |
2351 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
2352 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
2353 | ||
d62a17ae | 2354 | bgp_notify_send_with_data( |
2355 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
2356 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
2357 | ndl + lfl + 1); | |
2358 | ||
d62a17ae | 2359 | return BGP_ATTR_PARSE_ERROR; |
2360 | } | |
2361 | ||
2362 | struct bgp_attr_parser_args attr_args = { | |
2363 | .peer = peer, | |
2364 | .length = length, | |
2365 | .attr = attr, | |
2366 | .type = type, | |
2367 | .flags = flag, | |
2368 | .startp = startp, | |
2369 | .total = attr_endp - startp, | |
2370 | }; | |
2371 | ||
2372 | ||
2373 | /* If any recognized attribute has Attribute Flags that conflict | |
2374 | with the Attribute Type Code, then the Error Subcode is set | |
2375 | to | |
2376 | Attribute Flags Error. The Data field contains the erroneous | |
2377 | attribute (type, length and value). */ | |
2378 | if (bgp_attr_flag_invalid(&attr_args)) { | |
2379 | bgp_attr_parse_ret_t ret; | |
2380 | ret = bgp_attr_malformed( | |
2381 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2382 | attr_args.total); | |
2383 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2384 | continue; | |
2385 | return ret; | |
2386 | } | |
2387 | ||
2388 | /* OK check attribute and store it's value. */ | |
2389 | switch (type) { | |
2390 | case BGP_ATTR_ORIGIN: | |
2391 | ret = bgp_attr_origin(&attr_args); | |
2392 | break; | |
2393 | case BGP_ATTR_AS_PATH: | |
2394 | ret = bgp_attr_aspath(&attr_args); | |
2395 | break; | |
2396 | case BGP_ATTR_AS4_PATH: | |
2397 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2398 | break; | |
2399 | case BGP_ATTR_NEXT_HOP: | |
2400 | ret = bgp_attr_nexthop(&attr_args); | |
2401 | break; | |
2402 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2403 | ret = bgp_attr_med(&attr_args); | |
2404 | break; | |
2405 | case BGP_ATTR_LOCAL_PREF: | |
2406 | ret = bgp_attr_local_pref(&attr_args); | |
2407 | break; | |
2408 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2409 | ret = bgp_attr_atomic(&attr_args); | |
2410 | break; | |
2411 | case BGP_ATTR_AGGREGATOR: | |
2412 | ret = bgp_attr_aggregator(&attr_args); | |
2413 | break; | |
2414 | case BGP_ATTR_AS4_AGGREGATOR: | |
2415 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2416 | &as4_aggregator, | |
2417 | &as4_aggregator_addr); | |
2418 | break; | |
2419 | case BGP_ATTR_COMMUNITIES: | |
2420 | ret = bgp_attr_community(&attr_args); | |
2421 | break; | |
2422 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2423 | ret = bgp_attr_large_community(&attr_args); | |
2424 | break; | |
2425 | case BGP_ATTR_ORIGINATOR_ID: | |
2426 | ret = bgp_attr_originator_id(&attr_args); | |
2427 | break; | |
2428 | case BGP_ATTR_CLUSTER_LIST: | |
2429 | ret = bgp_attr_cluster_list(&attr_args); | |
2430 | break; | |
2431 | case BGP_ATTR_MP_REACH_NLRI: | |
2432 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2433 | break; | |
2434 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2435 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2436 | break; | |
2437 | case BGP_ATTR_EXT_COMMUNITIES: | |
2438 | ret = bgp_attr_ext_communities(&attr_args); | |
2439 | break; | |
65efcfce | 2440 | #if ENABLE_BGP_VNC |
d62a17ae | 2441 | case BGP_ATTR_VNC: |
65efcfce | 2442 | #endif |
d62a17ae | 2443 | case BGP_ATTR_ENCAP: |
2444 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2445 | startp); | |
2446 | break; | |
2447 | case BGP_ATTR_PREFIX_SID: | |
2448 | ret = bgp_attr_prefix_sid(&attr_args, mp_update); | |
2449 | break; | |
2450 | default: | |
2451 | ret = bgp_attr_unknown(&attr_args); | |
2452 | break; | |
2453 | } | |
2454 | ||
2455 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2456 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2457 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2458 | ret = BGP_ATTR_PARSE_ERROR; | |
2459 | } | |
2460 | ||
9b9df989 DS |
2461 | if (ret == BGP_ATTR_PARSE_EOR) { |
2462 | if (as4_path) | |
2463 | aspath_unintern(&as4_path); | |
2464 | return ret; | |
2465 | } | |
2466 | ||
d62a17ae | 2467 | /* If hard error occured immediately return to the caller. */ |
2468 | if (ret == BGP_ATTR_PARSE_ERROR) { | |
2469 | zlog_warn("%s: Attribute %s, parse error", peer->host, | |
2470 | lookup_msg(attr_str, type, NULL)); | |
2471 | if (as4_path) | |
2472 | aspath_unintern(&as4_path); | |
2473 | return ret; | |
2474 | } | |
2475 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2476 | ||
2477 | zlog_warn( | |
2478 | "%s: Attribute %s, parse error - treating as withdrawal", | |
2479 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2480 | if (as4_path) | |
2481 | aspath_unintern(&as4_path); | |
2482 | return ret; | |
2483 | } | |
2484 | ||
2485 | /* Check the fetched length. */ | |
2486 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
2487 | zlog_warn("%s: BGP attribute %s, fetch error", | |
2488 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2489 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2490 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2491 | if (as4_path) | |
2492 | aspath_unintern(&as4_path); | |
2493 | return BGP_ATTR_PARSE_ERROR; | |
2494 | } | |
718e3744 | 2495 | } |
d62a17ae | 2496 | |
2497 | /* Check final read pointer is same as end pointer. */ | |
2498 | if (BGP_INPUT_PNT(peer) != endp) { | |
2499 | zlog_warn("%s: BGP attribute %s, length mismatch", peer->host, | |
2500 | lookup_msg(attr_str, type, NULL)); | |
2501 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2502 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2503 | if (as4_path) | |
2504 | aspath_unintern(&as4_path); | |
2505 | return BGP_ATTR_PARSE_ERROR; | |
2506 | } | |
2507 | ||
2508 | /* Check all mandatory well-known attributes are present */ | |
718e3744 | 2509 | { |
d62a17ae | 2510 | bgp_attr_parse_ret_t ret; |
2511 | if ((ret = bgp_attr_check(peer, attr)) < 0) { | |
2512 | if (as4_path) | |
2513 | aspath_unintern(&as4_path); | |
2514 | return ret; | |
2515 | } | |
2516 | } | |
2517 | ||
2518 | /* | |
2519 | * At this place we can see whether we got AS4_PATH and/or | |
2520 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2521 | * We can not do this before we've read all attributes because | |
2522 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2523 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2524 | * in relationship to AGGREGATOR. | |
2525 | * So, to be defensive, we are not relying on any order and read | |
2526 | * all attributes first, including these 32bit ones, and now, | |
2527 | * afterwards, we look what and if something is to be done for as4. | |
2528 | * | |
2529 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2530 | * MP_UNREACH_NLRI. | |
2531 | */ | |
2532 | /* actually... this doesn't ever return failure currently, but | |
2533 | * better safe than sorry */ | |
2534 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2535 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2536 | &as4_aggregator_addr)) { | |
2537 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2538 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2539 | if (as4_path) | |
2540 | aspath_unintern(&as4_path); | |
2541 | return BGP_ATTR_PARSE_ERROR; | |
2542 | } | |
2543 | ||
2544 | /* At this stage, we have done all fiddling with as4, and the | |
2545 | * resulting info is in attr->aggregator resp. attr->aspath | |
2546 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2547 | * order to save memory | |
2548 | */ | |
2549 | if (as4_path) { | |
2550 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2551 | /* The flag that we got this is still there, but that does not | |
2552 | * do any trouble | |
2553 | */ | |
2554 | } | |
2555 | /* | |
2556 | * The "rest" of the code does nothing with as4_aggregator. | |
2557 | * there is no memory attached specifically which is not part | |
2558 | * of the attr. | |
2559 | * so ignoring just means do nothing. | |
2560 | */ | |
2561 | /* | |
2562 | * Finally do the checks on the aspath we did not do yet | |
2563 | * because we waited for a potentially synthesized aspath. | |
2564 | */ | |
2565 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2566 | ret = bgp_attr_aspath_check(peer, attr); | |
2567 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2568 | return ret; | |
2569 | } | |
2570 | /* Finally intern unknown attribute. */ | |
2571 | if (attr->transit) | |
2572 | attr->transit = transit_intern(attr->transit); | |
2573 | if (attr->encap_subtlvs) | |
2574 | attr->encap_subtlvs = | |
2575 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2576 | #if ENABLE_BGP_VNC |
d62a17ae | 2577 | if (attr->vnc_subtlvs) |
2578 | attr->vnc_subtlvs = | |
2579 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2580 | #endif |
718e3744 | 2581 | |
d62a17ae | 2582 | return BGP_ATTR_PARSE_PROCEED; |
2583 | } | |
2584 | ||
2585 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, | |
2586 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2587 | struct attr *attr) | |
2588 | { | |
2589 | size_t sizep; | |
2590 | iana_afi_t pkt_afi; | |
5c525538 | 2591 | iana_safi_t pkt_safi; |
d62a17ae | 2592 | afi_t nh_afi; |
2593 | ||
2594 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2595 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2596 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2597 | sizep = stream_get_endp(s); | |
2598 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2599 | ||
2600 | ||
2601 | /* Convert AFI, SAFI to values for packet. */ | |
2602 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2603 | ||
2604 | stream_putw(s, pkt_afi); /* AFI */ | |
2605 | stream_putc(s, pkt_safi); /* SAFI */ | |
2606 | ||
2607 | /* Nexthop AFI */ | |
ce78a6fb | 2608 | if (afi == AFI_IP |
2609 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
d62a17ae | 2610 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
d62a17ae | 2611 | else |
2612 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2613 | ||
2614 | /* Nexthop */ | |
2615 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2616 | switch (nh_afi) { | |
2617 | case AFI_IP: | |
2618 | switch (safi) { | |
2619 | case SAFI_UNICAST: | |
2620 | case SAFI_MULTICAST: | |
2621 | case SAFI_LABELED_UNICAST: | |
2622 | stream_putc(s, 4); | |
2623 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2624 | break; | |
2625 | case SAFI_MPLS_VPN: | |
2626 | stream_putc(s, 12); | |
2627 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2628 | stream_putl(s, 0); | |
2629 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2630 | break; | |
2631 | case SAFI_ENCAP: | |
2632 | case SAFI_EVPN: | |
2633 | stream_putc(s, 4); | |
2634 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2635 | break; | |
2636 | default: | |
2637 | break; | |
2638 | } | |
2639 | break; | |
2640 | case AFI_IP6: | |
2641 | switch (safi) { | |
2642 | case SAFI_UNICAST: | |
2643 | case SAFI_MULTICAST: | |
2644 | case SAFI_LABELED_UNICAST: | |
2645 | case SAFI_EVPN: { | |
2646 | if (attr->mp_nexthop_len | |
2647 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2648 | stream_putc(s, | |
2649 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2650 | stream_put(s, &attr->mp_nexthop_global, | |
2651 | IPV6_MAX_BYTELEN); | |
2652 | stream_put(s, &attr->mp_nexthop_local, | |
2653 | IPV6_MAX_BYTELEN); | |
2654 | } else { | |
2655 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2656 | stream_put(s, &attr->mp_nexthop_global, | |
2657 | IPV6_MAX_BYTELEN); | |
2658 | } | |
2659 | } break; | |
2660 | case SAFI_MPLS_VPN: { | |
2661 | if (attr->mp_nexthop_len | |
2662 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2663 | stream_putc(s, 24); | |
2664 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2665 | stream_putl(s, 0); | |
2666 | stream_put(s, &attr->mp_nexthop_global, | |
2667 | IPV6_MAX_BYTELEN); | |
2668 | } else if (attr->mp_nexthop_len | |
2669 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2670 | stream_putc(s, 48); | |
2671 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2672 | stream_putl(s, 0); | |
2673 | stream_put(s, &attr->mp_nexthop_global, | |
2674 | IPV6_MAX_BYTELEN); | |
2675 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2676 | stream_putl(s, 0); | |
2677 | stream_put(s, &attr->mp_nexthop_local, | |
2678 | IPV6_MAX_BYTELEN); | |
2679 | } | |
2680 | } break; | |
2681 | case SAFI_ENCAP: | |
2682 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2683 | stream_put(s, &attr->mp_nexthop_global, | |
2684 | IPV6_MAX_BYTELEN); | |
2685 | break; | |
2686 | default: | |
2687 | break; | |
2688 | } | |
2689 | break; | |
8c71e481 | 2690 | default: |
d62a17ae | 2691 | zlog_err( |
2692 | "Bad nexthop when sening to %s, AFI %u SAFI %u nhlen %d", | |
2693 | peer->host, afi, safi, attr->mp_nexthop_len); | |
2694 | break; | |
2695 | } | |
2696 | ||
2697 | /* SNPA */ | |
2698 | stream_putc(s, 0); | |
2699 | return sizep; | |
2700 | } | |
2701 | ||
2702 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2703 | struct prefix *p, struct prefix_rd *prd, | |
b57ba6d2 MK |
2704 | mpls_label_t *label, u_int32_t num_labels, |
2705 | int addpath_encode, u_int32_t addpath_tx_id, | |
2706 | struct attr *attr) | |
d62a17ae | 2707 | { |
2708 | if (safi == SAFI_MPLS_VPN) { | |
2709 | if (addpath_encode) | |
2710 | stream_putl(s, addpath_tx_id); | |
2711 | /* Label, RD, Prefix write. */ | |
2712 | stream_putc(s, p->prefixlen + 88); | |
2713 | stream_put(s, label, BGP_LABEL_BYTES); | |
2714 | stream_put(s, prd->val, 8); | |
2715 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2716 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2717 | /* EVPN prefix - contents depend on type */ | |
b57ba6d2 MK |
2718 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, |
2719 | attr, addpath_encode, addpath_tx_id); | |
d62a17ae | 2720 | } else if (safi == SAFI_LABELED_UNICAST) { |
2721 | /* Prefix write with label. */ | |
2722 | stream_put_labeled_prefix(s, p, label); | |
2723 | } else | |
2724 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2725 | } | |
2726 | ||
2727 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2728 | { | |
2729 | int size = PSIZE(p->prefixlen); | |
2730 | if (safi == SAFI_MPLS_VPN) | |
2731 | size += 88; | |
2732 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2733 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2734 | // type-5 | |
2735 | return size; | |
8c71e481 PM |
2736 | } |
2737 | ||
f4c89855 | 2738 | /* |
65efcfce | 2739 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 2740 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 2741 | * almost the same TLV format |
f4c89855 | 2742 | */ |
d62a17ae | 2743 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
2744 | struct stream *s, struct attr *attr, | |
2745 | uint8_t attrtype) | |
2746 | { | |
2747 | unsigned int attrlenfield = 0; | |
2748 | unsigned int attrhdrlen = 0; | |
2749 | struct bgp_attr_encap_subtlv *subtlvs; | |
2750 | struct bgp_attr_encap_subtlv *st; | |
2751 | const char *attrname; | |
2752 | ||
9d303b37 DL |
2753 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
2754 | && (!attr->encap_tunneltype | |
2755 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 2756 | return; |
2757 | ||
2758 | switch (attrtype) { | |
f4c89855 | 2759 | case BGP_ATTR_ENCAP: |
d62a17ae | 2760 | attrname = "Tunnel Encap"; |
2761 | subtlvs = attr->encap_subtlvs; | |
2762 | if (subtlvs == NULL) /* nothing to do */ | |
2763 | return; | |
2764 | /* | |
2765 | * The tunnel encap attr has an "outer" tlv. | |
2766 | * T = tunneltype, | |
2767 | * L = total length of subtlvs, | |
2768 | * V = concatenated subtlvs. | |
2769 | */ | |
2770 | attrlenfield = 2 + 2; /* T + L */ | |
2771 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
2772 | break; | |
f4c89855 | 2773 | |
65efcfce LB |
2774 | #if ENABLE_BGP_VNC |
2775 | case BGP_ATTR_VNC: | |
d62a17ae | 2776 | attrname = "VNC"; |
2777 | subtlvs = attr->vnc_subtlvs; | |
2778 | if (subtlvs == NULL) /* nothing to do */ | |
2779 | return; | |
2780 | attrlenfield = 0; /* no outer T + L */ | |
2781 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2782 | break; | |
65efcfce LB |
2783 | #endif |
2784 | ||
f4c89855 | 2785 | default: |
d62a17ae | 2786 | assert(0); |
2787 | } | |
2788 | ||
2789 | /* compute attr length */ | |
2790 | for (st = subtlvs; st; st = st->next) { | |
2791 | attrlenfield += (attrhdrlen + st->length); | |
2792 | } | |
2793 | ||
2794 | if (attrlenfield > 0xffff) { | |
2795 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
2796 | attrname, attrlenfield); | |
2797 | return; | |
2798 | } | |
2799 | ||
2800 | if (attrlenfield > 0xff) { | |
2801 | /* 2-octet length field */ | |
ce78a6fb | 2802 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL |
2803 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2804 | stream_putc(s, attrtype); |
2805 | stream_putw(s, attrlenfield & 0xffff); | |
2806 | } else { | |
2807 | /* 1-octet length field */ | |
2808 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
2809 | stream_putc(s, attrtype); | |
2810 | stream_putc(s, attrlenfield & 0xff); | |
2811 | } | |
2812 | ||
2813 | if (attrtype == BGP_ATTR_ENCAP) { | |
2814 | /* write outer T+L */ | |
2815 | stream_putw(s, attr->encap_tunneltype); | |
2816 | stream_putw(s, attrlenfield - 4); | |
2817 | } | |
2818 | ||
2819 | /* write each sub-tlv */ | |
2820 | for (st = subtlvs; st; st = st->next) { | |
2821 | if (attrtype == BGP_ATTR_ENCAP) { | |
2822 | stream_putc(s, st->type); | |
2823 | stream_putc(s, st->length); | |
65efcfce | 2824 | #if ENABLE_BGP_VNC |
d62a17ae | 2825 | } else { |
2826 | stream_putw(s, st->type); | |
2827 | stream_putw(s, st->length); | |
65efcfce | 2828 | #endif |
d62a17ae | 2829 | } |
2830 | stream_put(s, st->value, st->length); | |
2831 | } | |
f4c89855 | 2832 | } |
f4c89855 | 2833 | |
d62a17ae | 2834 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 2835 | { |
d62a17ae | 2836 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
2837 | the attr length */ | |
2838 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
2839 | } |
2840 | ||
718e3744 | 2841 | /* Make attribute packet. */ |
d62a17ae | 2842 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
2843 | struct stream *s, struct attr *attr, | |
2844 | struct bpacket_attr_vec_arr *vecarr, | |
2845 | struct prefix *p, afi_t afi, safi_t safi, | |
2846 | struct peer *from, struct prefix_rd *prd, | |
b57ba6d2 MK |
2847 | mpls_label_t *label, u_int32_t num_labels, |
2848 | int addpath_encode, u_int32_t addpath_tx_id) | |
d62a17ae | 2849 | { |
2850 | size_t cp; | |
2851 | size_t aspath_sizep; | |
2852 | struct aspath *aspath; | |
2853 | int send_as4_path = 0; | |
2854 | int send_as4_aggregator = 0; | |
2855 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
2856 | ||
2857 | if (!bgp) | |
2858 | bgp = peer->bgp; | |
2859 | ||
2860 | /* Remember current pointer. */ | |
2861 | cp = stream_get_endp(s); | |
2862 | ||
2863 | if (p | |
2864 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
2865 | && !peer_cap_enhe(peer, afi, safi))) { | |
2866 | size_t mpattrlen_pos = 0; | |
2867 | ||
2868 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
2869 | vecarr, attr); | |
b57ba6d2 MK |
2870 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, |
2871 | label, num_labels, | |
d62a17ae | 2872 | addpath_encode, addpath_tx_id, attr); |
2873 | bgp_packet_mpattr_end(s, mpattrlen_pos); | |
718e3744 | 2874 | } |
d62a17ae | 2875 | |
2876 | /* Origin attribute. */ | |
2877 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2878 | stream_putc(s, BGP_ATTR_ORIGIN); | |
2879 | stream_putc(s, 1); | |
2880 | stream_putc(s, attr->origin); | |
2881 | ||
2882 | /* AS path attribute. */ | |
2883 | ||
2884 | /* If remote-peer is EBGP */ | |
2885 | if (peer->sort == BGP_PEER_EBGP | |
2886 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
2887 | PEER_FLAG_AS_PATH_UNCHANGED) | |
2888 | || attr->aspath->segments == NULL) | |
2889 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
2890 | PEER_FLAG_RSERVER_CLIENT))) { | |
2891 | aspath = aspath_dup(attr->aspath); | |
2892 | ||
2893 | /* Even though we may not be configured for confederations we | |
2894 | * may have | |
2895 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
2896 | aspath = aspath_delete_confed_seq(aspath); | |
2897 | ||
2898 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
2899 | /* Stuff our path CONFED_ID on the front */ | |
2900 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
2901 | } else { | |
2902 | if (peer->change_local_as) { | |
2903 | /* If replace-as is specified, we only use the | |
2904 | change_local_as when | |
2905 | advertising routes. */ | |
2906 | if (!CHECK_FLAG( | |
2907 | peer->flags, | |
2908 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) { | |
2909 | aspath = aspath_add_seq(aspath, | |
2910 | peer->local_as); | |
2911 | } | |
2912 | aspath = aspath_add_seq(aspath, | |
2913 | peer->change_local_as); | |
2914 | } else { | |
2915 | aspath = aspath_add_seq(aspath, peer->local_as); | |
2916 | } | |
2917 | } | |
2918 | } else if (peer->sort == BGP_PEER_CONFED) { | |
2919 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
2920 | * thing */ | |
2921 | aspath = aspath_dup(attr->aspath); | |
2922 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
2923 | } else | |
2924 | aspath = attr->aspath; | |
2925 | ||
2926 | /* If peer is not AS4 capable, then: | |
2927 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
2928 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
2929 | * segment | |
2930 | * types are in it (i.e. exclude them if they are there) | |
2931 | * AND do this only if there is at least one asnum > 65535 in the | |
2932 | * path! | |
2933 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
2934 | * change | |
2935 | * all ASnums > 65535 to BGP_AS_TRANS | |
2936 | */ | |
2937 | ||
2938 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
2939 | stream_putc(s, BGP_ATTR_AS_PATH); | |
2940 | aspath_sizep = stream_get_endp(s); | |
2941 | stream_putw(s, 0); | |
2942 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
2943 | ||
2944 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
2945 | * in the path | |
2946 | */ | |
2947 | if (!use32bit && aspath_has_as4(aspath)) | |
2948 | send_as4_path = | |
2949 | 1; /* we'll do this later, at the correct place */ | |
2950 | ||
2951 | /* Nexthop attribute. */ | |
2952 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
2953 | && !peer_cap_enhe(peer, afi, safi)) { | |
2954 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
2955 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2956 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
2957 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
2958 | attr); | |
2959 | stream_putc(s, 4); | |
2960 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2961 | } else if (peer_cap_enhe(from, afi, safi)) { | |
2962 | /* | |
2963 | * Likely this is the case when an IPv4 prefix was | |
2964 | * received with | |
2965 | * Extended Next-hop capability and now being advertised | |
2966 | * to | |
2967 | * non-ENHE peers. | |
2968 | * Setting the mandatory (ipv4) next-hop attribute here | |
2969 | * to enable | |
2970 | * implicit next-hop self with correct (ipv4 address | |
2971 | * family). | |
2972 | */ | |
2973 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2974 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
2975 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
2976 | NULL); | |
2977 | stream_putc(s, 4); | |
2978 | stream_put_ipv4(s, 0); | |
2979 | } | |
718e3744 | 2980 | } |
d62a17ae | 2981 | |
2982 | /* MED attribute. */ | |
2983 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
2984 | || bgp->maxmed_active) { | |
2985 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
2986 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
2987 | stream_putc(s, 4); | |
2988 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
2989 | : attr->med)); | |
2990 | } | |
2991 | ||
2992 | /* Local preference. */ | |
2993 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
2994 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2995 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
2996 | stream_putc(s, 4); | |
2997 | stream_putl(s, attr->local_pref); | |
2998 | } | |
2999 | ||
3000 | /* Atomic aggregate. */ | |
3001 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3002 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3003 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3004 | stream_putc(s, 0); | |
3005 | } | |
3006 | ||
3007 | /* Aggregator. */ | |
3008 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3009 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3010 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3011 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3012 | ||
3013 | if (use32bit) { | |
3014 | /* AS4 capable peer */ | |
3015 | stream_putc(s, 8); | |
3016 | stream_putl(s, attr->aggregator_as); | |
3017 | } else { | |
3018 | /* 2-byte AS peer */ | |
3019 | stream_putc(s, 6); | |
3020 | ||
3021 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3022 | * used? */ | |
3023 | if (attr->aggregator_as > 65535) { | |
3024 | stream_putw(s, BGP_AS_TRANS); | |
3025 | ||
3026 | /* we have to send AS4_AGGREGATOR, too. | |
3027 | * we'll do that later in order to send | |
3028 | * attributes in ascending | |
3029 | * order. | |
3030 | */ | |
3031 | send_as4_aggregator = 1; | |
3032 | } else | |
3033 | stream_putw(s, (u_int16_t)attr->aggregator_as); | |
3034 | } | |
3035 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3036 | } | |
3037 | ||
3038 | /* Community attribute. */ | |
3039 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3040 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3041 | if (attr->community->size * 4 > 255) { | |
ce78a6fb | 3042 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3043 | | BGP_ATTR_FLAG_TRANS | |
3044 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3045 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3046 | stream_putw(s, attr->community->size * 4); | |
3047 | } else { | |
ce78a6fb | 3048 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3049 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3050 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3051 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3052 | } |
d62a17ae | 3053 | stream_put(s, attr->community->val, attr->community->size * 4); |
3054 | } | |
3055 | ||
3056 | /* | |
3057 | * Large Community attribute. | |
3058 | */ | |
3059 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3060 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3061 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3062 | if (lcom_length(attr->lcommunity) > 255) { |
ce78a6fb | 3063 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3064 | | BGP_ATTR_FLAG_TRANS | |
3065 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3066 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3067 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3068 | } else { |
ce78a6fb | 3069 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3070 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3071 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3072 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3073 | } |
d62a17ae | 3074 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3075 | lcom_length(attr->lcommunity)); |
d62a17ae | 3076 | } |
4372df71 | 3077 | |
d62a17ae | 3078 | /* Route Reflector. */ |
3079 | if (peer->sort == BGP_PEER_IBGP && from | |
3080 | && from->sort == BGP_PEER_IBGP) { | |
3081 | /* Originator ID. */ | |
3082 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3083 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3084 | stream_putc(s, 4); | |
3085 | ||
3086 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3087 | stream_put_in_addr(s, &attr->originator_id); | |
3088 | else | |
3089 | stream_put_in_addr(s, &from->remote_id); | |
3090 | ||
3091 | /* Cluster list. */ | |
3092 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3093 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3094 | ||
3095 | if (attr->cluster) { | |
3096 | stream_putc(s, attr->cluster->length + 4); | |
3097 | /* If this peer configuration's parent BGP has | |
3098 | * cluster_id. */ | |
3099 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3100 | stream_put_in_addr(s, &bgp->cluster_id); | |
3101 | else | |
3102 | stream_put_in_addr(s, &bgp->router_id); | |
3103 | stream_put(s, attr->cluster->list, | |
3104 | attr->cluster->length); | |
3105 | } else { | |
3106 | stream_putc(s, 4); | |
3107 | /* If this peer configuration's parent BGP has | |
3108 | * cluster_id. */ | |
3109 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3110 | stream_put_in_addr(s, &bgp->cluster_id); | |
3111 | else | |
3112 | stream_put_in_addr(s, &bgp->router_id); | |
3113 | } | |
3114 | } | |
4372df71 | 3115 | |
d62a17ae | 3116 | /* Extended Communities attribute. */ |
3117 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3118 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3119 | if (peer->sort == BGP_PEER_IBGP | |
3120 | || peer->sort == BGP_PEER_CONFED) { | |
3121 | if (attr->ecommunity->size * 8 > 255) { | |
ce78a6fb | 3122 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3123 | | BGP_ATTR_FLAG_TRANS | |
3124 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3125 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3126 | stream_putw(s, attr->ecommunity->size * 8); | |
3127 | } else { | |
ce78a6fb | 3128 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3129 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3130 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3131 | stream_putc(s, attr->ecommunity->size * 8); | |
3132 | } | |
3133 | stream_put(s, attr->ecommunity->val, | |
3134 | attr->ecommunity->size * 8); | |
3135 | } else { | |
3136 | u_int8_t *pnt; | |
3137 | int tbit; | |
3138 | int ecom_tr_size = 0; | |
3139 | int i; | |
3140 | ||
3141 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3142 | pnt = attr->ecommunity->val + (i * 8); | |
3143 | tbit = *pnt; | |
3144 | ||
3145 | if (CHECK_FLAG(tbit, | |
3146 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3147 | continue; | |
3148 | ||
3149 | ecom_tr_size++; | |
3150 | } | |
3151 | ||
3152 | if (ecom_tr_size) { | |
3153 | if (ecom_tr_size * 8 > 255) { | |
3154 | stream_putc( | |
3155 | s, | |
3156 | BGP_ATTR_FLAG_OPTIONAL | |
3157 | | BGP_ATTR_FLAG_TRANS | |
3158 | | BGP_ATTR_FLAG_EXTLEN); | |
3159 | stream_putc(s, | |
3160 | BGP_ATTR_EXT_COMMUNITIES); | |
3161 | stream_putw(s, ecom_tr_size * 8); | |
3162 | } else { | |
3163 | stream_putc( | |
3164 | s, | |
3165 | BGP_ATTR_FLAG_OPTIONAL | |
3166 | | BGP_ATTR_FLAG_TRANS); | |
3167 | stream_putc(s, | |
3168 | BGP_ATTR_EXT_COMMUNITIES); | |
3169 | stream_putc(s, ecom_tr_size * 8); | |
3170 | } | |
3171 | ||
3172 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3173 | pnt = attr->ecommunity->val + (i * 8); | |
3174 | tbit = *pnt; | |
3175 | ||
3176 | if (CHECK_FLAG( | |
3177 | tbit, | |
3178 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3179 | continue; | |
3180 | ||
3181 | stream_put(s, pnt, 8); | |
3182 | } | |
3183 | } | |
3184 | } | |
3185 | } | |
4372df71 | 3186 | |
d62a17ae | 3187 | /* Label index attribute. */ |
3188 | if (safi == SAFI_LABELED_UNICAST) { | |
3189 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3190 | u_int32_t label_index; | |
3191 | ||
3192 | label_index = attr->label_index; | |
3193 | ||
3194 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
ce78a6fb | 3195 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3196 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3197 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3198 | stream_putc(s, 10); | |
3199 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3200 | stream_putw(s, | |
3201 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3202 | stream_putc(s, 0); // reserved | |
3203 | stream_putw(s, 0); // flags | |
3204 | stream_putl(s, label_index); | |
3205 | } | |
4372df71 | 3206 | } |
d62a17ae | 3207 | } |
3208 | ||
3209 | if (send_as4_path) { | |
3210 | /* If the peer is NOT As4 capable, AND */ | |
3211 | /* there are ASnums > 65535 in path THEN | |
3212 | * give out AS4_PATH */ | |
3213 | ||
3214 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3215 | * path segments! | |
3216 | * Hm, I wonder... confederation things *should* only be at | |
3217 | * the beginning of an aspath, right? Then we should use | |
3218 | * aspath_delete_confed_seq for this, because it is already | |
3219 | * there! (JK) | |
3220 | * Folks, talk to me: what is reasonable here!? | |
3221 | */ | |
3222 | aspath = aspath_delete_confed_seq(aspath); | |
3223 | ||
ce78a6fb | 3224 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL |
3225 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3226 | stream_putc(s, BGP_ATTR_AS4_PATH); |
3227 | aspath_sizep = stream_get_endp(s); | |
3228 | stream_putw(s, 0); | |
3229 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3230 | } | |
3231 | ||
3232 | if (aspath != attr->aspath) | |
3233 | aspath_free(aspath); | |
3234 | ||
3235 | if (send_as4_aggregator) { | |
3236 | /* send AS4_AGGREGATOR, at this place */ | |
3237 | /* this section of code moved here in order to ensure the | |
3238 | * correct | |
3239 | * *ascending* order of attributes | |
3240 | */ | |
3241 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3242 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3243 | stream_putc(s, 8); | |
3244 | stream_putl(s, attr->aggregator_as); | |
3245 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3246 | } | |
3247 | ||
3248 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3249 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3250 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3251 | /* Tunnel Encap attribute */ | |
3252 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3253 | |
3254 | #if ENABLE_BGP_VNC | |
d62a17ae | 3255 | /* VNC attribute */ |
3256 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 3257 | #endif |
d62a17ae | 3258 | } |
587ff0fd | 3259 | |
a21bd7a3 DW |
3260 | /* PMSI Tunnel */ |
3261 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
3262 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3263 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
3264 | stream_putc(s, 9); // Length | |
3265 | stream_putc(s, 0); // Flags | |
3266 | stream_putc(s, 6); // Tunnel type: Ingress Replication (6) | |
3267 | stream_put(s, &(attr->label), BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
3268 | stream_put_ipv4(s, attr->nexthop.s_addr); // Unicast tunnel endpoint IP address | |
3269 | } | |
3270 | ||
d62a17ae | 3271 | /* Unknown transit attribute. */ |
3272 | if (attr->transit) | |
3273 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 3274 | |
d62a17ae | 3275 | /* Return total size of attribute. */ |
3276 | return stream_get_endp(s) - cp; | |
718e3744 | 3277 | } |
3278 | ||
d62a17ae | 3279 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 3280 | { |
d62a17ae | 3281 | unsigned long attrlen_pnt; |
3282 | iana_afi_t pkt_afi; | |
5c525538 | 3283 | iana_safi_t pkt_safi; |
718e3744 | 3284 | |
d62a17ae | 3285 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3286 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3287 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 3288 | |
d62a17ae | 3289 | attrlen_pnt = stream_get_endp(s); |
3290 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 3291 | |
d62a17ae | 3292 | /* Convert AFI, SAFI to values for packet. */ |
3293 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 3294 | |
d62a17ae | 3295 | stream_putw(s, pkt_afi); |
3296 | stream_putc(s, pkt_safi); | |
9cabb64b | 3297 | |
d62a17ae | 3298 | return attrlen_pnt; |
8c71e481 | 3299 | } |
718e3744 | 3300 | |
d62a17ae | 3301 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, |
3302 | safi_t safi, struct prefix_rd *prd, | |
b57ba6d2 MK |
3303 | mpls_label_t *label, u_int32_t num_labels, |
3304 | int addpath_encode, u_int32_t addpath_tx_id, | |
3305 | struct attr *attr) | |
8c71e481 | 3306 | { |
d62a17ae | 3307 | u_char wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 3308 | |
b57ba6d2 | 3309 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 3310 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
3311 | num_labels = 1; |
3312 | } | |
cd1964ff | 3313 | |
b57ba6d2 MK |
3314 | return bgp_packet_mpattr_prefix(s, afi, safi, p, prd, |
3315 | label, num_labels, | |
d62a17ae | 3316 | addpath_encode, addpath_tx_id, attr); |
8c71e481 | 3317 | } |
718e3744 | 3318 | |
d62a17ae | 3319 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 3320 | { |
d62a17ae | 3321 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 3322 | } |
3323 | ||
3324 | /* Initialization of attribute. */ | |
d62a17ae | 3325 | void bgp_attr_init(void) |
718e3744 | 3326 | { |
d62a17ae | 3327 | aspath_init(); |
3328 | attrhash_init(); | |
3329 | community_init(); | |
3330 | ecommunity_init(); | |
3331 | lcommunity_init(); | |
3332 | cluster_init(); | |
3333 | transit_init(); | |
3334 | encap_init(); | |
718e3744 | 3335 | } |
3336 | ||
d62a17ae | 3337 | void bgp_attr_finish(void) |
228da428 | 3338 | { |
d62a17ae | 3339 | aspath_finish(); |
3340 | attrhash_finish(); | |
3341 | community_finish(); | |
3342 | ecommunity_finish(); | |
3343 | lcommunity_finish(); | |
3344 | cluster_finish(); | |
3345 | transit_finish(); | |
3346 | encap_finish(); | |
228da428 CC |
3347 | } |
3348 | ||
718e3744 | 3349 | /* Make attribute packet. */ |
d62a17ae | 3350 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
3351 | struct prefix *prefix) | |
3352 | { | |
3353 | unsigned long cp; | |
3354 | unsigned long len; | |
3355 | size_t aspath_lenp; | |
3356 | struct aspath *aspath; | |
3357 | int addpath_encode = 0; | |
3358 | u_int32_t addpath_tx_id = 0; | |
3359 | ||
3360 | /* Remember current pointer. */ | |
3361 | cp = stream_get_endp(s); | |
3362 | ||
3363 | /* Place holder of length. */ | |
3364 | stream_putw(s, 0); | |
3365 | ||
3366 | /* Origin attribute. */ | |
3367 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3368 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3369 | stream_putc(s, 1); | |
3370 | stream_putc(s, attr->origin); | |
3371 | ||
3372 | aspath = attr->aspath; | |
3373 | ||
3374 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3375 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3376 | aspath_lenp = stream_get_endp(s); | |
3377 | stream_putw(s, 0); | |
3378 | ||
3379 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3380 | ||
3381 | /* Nexthop attribute. */ | |
3382 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3383 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3384 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3385 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3386 | stream_putc(s, 4); | |
3387 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 3388 | } |
d62a17ae | 3389 | |
3390 | /* MED attribute. */ | |
3391 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3392 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3393 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3394 | stream_putc(s, 4); | |
3395 | stream_putl(s, attr->med); | |
3396 | } | |
3397 | ||
3398 | /* Local preference. */ | |
3399 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3400 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3401 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3402 | stream_putc(s, 4); | |
3403 | stream_putl(s, attr->local_pref); | |
3404 | } | |
3405 | ||
3406 | /* Atomic aggregate. */ | |
3407 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3408 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3409 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3410 | stream_putc(s, 0); | |
3411 | } | |
3412 | ||
3413 | /* Aggregator. */ | |
3414 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3415 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3416 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3417 | stream_putc(s, 8); | |
3418 | stream_putl(s, attr->aggregator_as); | |
3419 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3420 | } | |
3421 | ||
3422 | /* Community attribute. */ | |
3423 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3424 | if (attr->community->size * 4 > 255) { | |
ce78a6fb | 3425 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3426 | | BGP_ATTR_FLAG_TRANS | |
3427 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3428 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3429 | stream_putw(s, attr->community->size * 4); | |
3430 | } else { | |
ce78a6fb | 3431 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3432 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3433 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3434 | stream_putc(s, attr->community->size * 4); | |
3435 | } | |
3436 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3437 | } | |
3438 | ||
3439 | /* Large Community attribute. */ | |
3440 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 3441 | if (lcom_length(attr->lcommunity) > 255) { |
ce78a6fb | 3442 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3443 | | BGP_ATTR_FLAG_TRANS | |
3444 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3445 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3446 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3447 | } else { |
ce78a6fb | 3448 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3449 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3450 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3451 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3452 | } |
3453 | ||
79dab4b7 | 3454 | stream_put(s, attr->lcommunity->val, lcom_length(attr->lcommunity)); |
d62a17ae | 3455 | } |
3456 | ||
3457 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3458 | if (prefix != NULL && prefix->family == AF_INET6 | |
3459 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3460 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3461 | int sizep; | |
3462 | ||
3463 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3464 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3465 | sizep = stream_get_endp(s); | |
3466 | ||
3467 | /* MP header */ | |
3468 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3469 | stream_putw(s, AFI_IP6); /* AFI */ | |
3470 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3471 | ||
3472 | /* Next hop */ | |
3473 | stream_putc(s, attr->mp_nexthop_len); | |
3474 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3475 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3476 | stream_put(s, &attr->mp_nexthop_local, | |
3477 | IPV6_MAX_BYTELEN); | |
3478 | ||
3479 | /* SNPA */ | |
3480 | stream_putc(s, 0); | |
3481 | ||
3482 | /* Prefix */ | |
3483 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3484 | addpath_tx_id); | |
3485 | ||
3486 | /* Set MP attribute length. */ | |
3487 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3488 | } | |
3489 | ||
3490 | /* Prefix SID */ | |
3491 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3492 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
ce78a6fb | 3493 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
3494 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3495 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3496 | stream_putc(s, 10); | |
3497 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3498 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3499 | stream_putc(s, 0); // reserved | |
3500 | stream_putw(s, 0); // flags | |
3501 | stream_putl(s, attr->label_index); | |
3502 | } | |
3503 | } | |
3504 | ||
3505 | /* Return total size of attribute. */ | |
3506 | len = stream_get_endp(s) - cp - 2; | |
3507 | stream_putw_at(s, cp, len); | |
718e3744 | 3508 | } |