]>
Commit | Line | Data |
---|---|---|
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" | |
14454c9f | 42 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 43 | #include "bgpd/bgp_label.h" |
718e3744 | 44 | #include "bgpd/bgp_packet.h" |
45 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 46 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 47 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 48 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 49 | #if ENABLE_BGP_VNC |
d62a17ae | 50 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
51 | #include "bgp_encap_types.h" | |
52 | #include "bgp_vnc_types.h" | |
65efcfce | 53 | #endif |
b18825eb PG |
54 | #include "bgp_encap_types.h" |
55 | #include "bgp_evpn.h" | |
7c40bf39 | 56 | #include "bgp_flowspec_private.h" |
6b0655a2 | 57 | |
718e3744 | 58 | /* Attribute strings for logging. */ |
d62a17ae | 59 | static const struct message attr_str[] = { |
60 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
61 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
62 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
63 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
64 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
65 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
66 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
67 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
68 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
69 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
70 | {BGP_ATTR_DPA, "DPA"}, | |
71 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
72 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
73 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
74 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
75 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
76 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
77 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
78 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 79 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 80 | {BGP_ATTR_ENCAP, "ENCAP"}, |
65efcfce | 81 | #if ENABLE_BGP_VNC |
d62a17ae | 82 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 83 | #endif |
d62a17ae | 84 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
85 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
86 | {0}}; | |
afcb7679 | 87 | |
996c9314 LB |
88 | static const struct message attr_flag_str[] = { |
89 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
90 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
91 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
92 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
93 | this list */ | |
94 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
95 | {0}}; | |
6b0655a2 | 96 | |
9bddac4b | 97 | static struct hash *cluster_hash; |
718e3744 | 98 | |
d62a17ae | 99 | static void *cluster_hash_alloc(void *p) |
718e3744 | 100 | { |
d62a17ae | 101 | const struct cluster_list *val = (const struct cluster_list *)p; |
102 | struct cluster_list *cluster; | |
718e3744 | 103 | |
d62a17ae | 104 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
105 | cluster->length = val->length; | |
718e3744 | 106 | |
d62a17ae | 107 | if (cluster->length) { |
108 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
109 | memcpy(cluster->list, val->list, val->length); | |
110 | } else | |
111 | cluster->list = NULL; | |
718e3744 | 112 | |
d62a17ae | 113 | cluster->refcnt = 0; |
718e3744 | 114 | |
d62a17ae | 115 | return cluster; |
718e3744 | 116 | } |
117 | ||
118 | /* Cluster list related functions. */ | |
d62a17ae | 119 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 120 | { |
d62a17ae | 121 | struct cluster_list tmp; |
122 | struct cluster_list *cluster; | |
718e3744 | 123 | |
d62a17ae | 124 | tmp.length = length; |
125 | tmp.list = pnt; | |
718e3744 | 126 | |
d62a17ae | 127 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
128 | cluster->refcnt++; | |
129 | return cluster; | |
718e3744 | 130 | } |
131 | ||
d62a17ae | 132 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 133 | { |
d62a17ae | 134 | int i; |
135 | ||
136 | for (i = 0; i < cluster->length / 4; i++) | |
137 | if (cluster->list[i].s_addr == originator.s_addr) | |
138 | return 1; | |
139 | return 0; | |
718e3744 | 140 | } |
141 | ||
d62a17ae | 142 | static unsigned int cluster_hash_key_make(void *p) |
718e3744 | 143 | { |
d62a17ae | 144 | const struct cluster_list *cluster = p; |
718e3744 | 145 | |
d62a17ae | 146 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 147 | } |
148 | ||
d62a17ae | 149 | static int cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 150 | { |
d62a17ae | 151 | const struct cluster_list *cluster1 = p1; |
152 | const struct cluster_list *cluster2 = p2; | |
923de654 | 153 | |
d62a17ae | 154 | return (cluster1->length == cluster2->length |
155 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
156 | == 0); | |
718e3744 | 157 | } |
158 | ||
d62a17ae | 159 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 160 | { |
d62a17ae | 161 | if (cluster->list) |
162 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); | |
163 | XFREE(MTYPE_CLUSTER, cluster); | |
718e3744 | 164 | } |
165 | ||
d62a17ae | 166 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 167 | { |
d62a17ae | 168 | struct cluster_list *find; |
718e3744 | 169 | |
d62a17ae | 170 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
171 | find->refcnt++; | |
718e3744 | 172 | |
d62a17ae | 173 | return find; |
718e3744 | 174 | } |
175 | ||
d62a17ae | 176 | void cluster_unintern(struct cluster_list *cluster) |
718e3744 | 177 | { |
d62a17ae | 178 | if (cluster->refcnt) |
179 | cluster->refcnt--; | |
718e3744 | 180 | |
d62a17ae | 181 | if (cluster->refcnt == 0) { |
182 | hash_release(cluster_hash, cluster); | |
183 | cluster_free(cluster); | |
184 | } | |
718e3744 | 185 | } |
186 | ||
d62a17ae | 187 | static void cluster_init(void) |
718e3744 | 188 | { |
996c9314 | 189 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 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 | { |
996c9314 | 366 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 367 | "BGP Encap Hash"); |
bede7744 | 368 | #if ENABLE_BGP_VNC |
996c9314 | 369 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 370 | "BGP VNC Hash"); |
bede7744 LB |
371 | #endif |
372 | } | |
373 | ||
d62a17ae | 374 | static void encap_finish(void) |
bede7744 | 375 | { |
d62a17ae | 376 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
377 | hash_free(encap_hash); | |
378 | encap_hash = NULL; | |
bede7744 | 379 | #if ENABLE_BGP_VNC |
d62a17ae | 380 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
381 | hash_free(vnc_hash); | |
382 | vnc_hash = NULL; | |
bede7744 LB |
383 | #endif |
384 | } | |
385 | ||
d62a17ae | 386 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 387 | { |
d62a17ae | 388 | if (!a1 && a2) |
389 | return false; | |
390 | if (!a2 && a1) | |
391 | return false; | |
392 | if (!a1 && !a2) | |
393 | return true; | |
394 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
395 | sizeof(struct overlay_index)); | |
684a7227 PG |
396 | } |
397 | ||
718e3744 | 398 | /* Unknown transit attribute. */ |
9bddac4b | 399 | static struct hash *transit_hash; |
718e3744 | 400 | |
d62a17ae | 401 | static void transit_free(struct transit *transit) |
718e3744 | 402 | { |
d62a17ae | 403 | if (transit->val) |
404 | XFREE(MTYPE_TRANSIT_VAL, transit->val); | |
405 | XFREE(MTYPE_TRANSIT, transit); | |
718e3744 | 406 | } |
407 | ||
d62a17ae | 408 | static void *transit_hash_alloc(void *p) |
718e3744 | 409 | { |
d62a17ae | 410 | /* Transit structure is already allocated. */ |
411 | return p; | |
718e3744 | 412 | } |
413 | ||
d62a17ae | 414 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 415 | { |
d62a17ae | 416 | struct transit *find; |
718e3744 | 417 | |
d62a17ae | 418 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
419 | if (find != transit) | |
420 | transit_free(transit); | |
421 | find->refcnt++; | |
718e3744 | 422 | |
d62a17ae | 423 | return find; |
718e3744 | 424 | } |
425 | ||
d62a17ae | 426 | void transit_unintern(struct transit *transit) |
718e3744 | 427 | { |
d62a17ae | 428 | if (transit->refcnt) |
429 | transit->refcnt--; | |
718e3744 | 430 | |
d62a17ae | 431 | if (transit->refcnt == 0) { |
432 | hash_release(transit_hash, transit); | |
433 | transit_free(transit); | |
434 | } | |
718e3744 | 435 | } |
436 | ||
d62a17ae | 437 | static unsigned int transit_hash_key_make(void *p) |
718e3744 | 438 | { |
d62a17ae | 439 | const struct transit *transit = p; |
718e3744 | 440 | |
d62a17ae | 441 | return jhash(transit->val, transit->length, 0); |
718e3744 | 442 | } |
443 | ||
d62a17ae | 444 | static int transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 445 | { |
d62a17ae | 446 | const struct transit *transit1 = p1; |
447 | const struct transit *transit2 = p2; | |
923de654 | 448 | |
d62a17ae | 449 | return (transit1->length == transit2->length |
450 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 451 | } |
452 | ||
d62a17ae | 453 | static void transit_init(void) |
718e3744 | 454 | { |
996c9314 | 455 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 456 | "BGP Transit Hash"); |
718e3744 | 457 | } |
228da428 | 458 | |
d62a17ae | 459 | static void transit_finish(void) |
228da428 | 460 | { |
d62a17ae | 461 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
462 | hash_free(transit_hash); | |
463 | transit_hash = NULL; | |
228da428 | 464 | } |
6b0655a2 | 465 | |
718e3744 | 466 | /* Attribute hash routines. */ |
9bddac4b | 467 | static struct hash *attrhash; |
718e3744 | 468 | |
fb982c25 PJ |
469 | /* Shallow copy of an attribute |
470 | * Though, not so shallow that it doesn't copy the contents | |
471 | * of the attr_extra pointed to by 'extra' | |
472 | */ | |
d62a17ae | 473 | void bgp_attr_dup(struct attr *new, struct attr *orig) |
fb982c25 | 474 | { |
d62a17ae | 475 | *new = *orig; |
fb982c25 PJ |
476 | } |
477 | ||
d62a17ae | 478 | unsigned long int attr_count(void) |
cbdfbaa5 | 479 | { |
d62a17ae | 480 | return attrhash->count; |
cbdfbaa5 PJ |
481 | } |
482 | ||
d62a17ae | 483 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 484 | { |
d62a17ae | 485 | return transit_hash->count; |
cbdfbaa5 PJ |
486 | } |
487 | ||
d62a17ae | 488 | unsigned int attrhash_key_make(void *p) |
718e3744 | 489 | { |
d62a17ae | 490 | const struct attr *attr = (struct attr *)p; |
491 | uint32_t key = 0; | |
c8e7b895 | 492 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 493 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 494 | |
0d0268a6 | 495 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
496 | MIX3(attr->local_pref, attr->aggregator_as, |
497 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
498 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
499 | attr->originator_id.s_addr); | |
500 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 501 | |
502 | if (attr->aspath) | |
503 | MIX(aspath_key_make(attr->aspath)); | |
504 | if (attr->community) | |
505 | MIX(community_hash_make(attr->community)); | |
506 | ||
507 | if (attr->lcommunity) | |
508 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
509 | if (attr->ecommunity) | |
510 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
511 | if (attr->cluster) | |
512 | MIX(cluster_hash_key_make(attr->cluster)); | |
513 | if (attr->transit) | |
514 | MIX(transit_hash_key_make(attr->transit)); | |
515 | if (attr->encap_subtlvs) | |
516 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
bede7744 | 517 | #if ENABLE_BGP_VNC |
d62a17ae | 518 | if (attr->vnc_subtlvs) |
519 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 520 | #endif |
d62a17ae | 521 | MIX(attr->mp_nexthop_len); |
522 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
523 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
77e62f2b | 524 | MIX(attr->nh_ifindex); |
525 | MIX(attr->nh_lla_ifindex); | |
d62a17ae | 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) | |
77e62f2b | 565 | && overlay_index_same(attr1, attr2) |
566 | && attr1->nh_ifindex == attr2->nh_ifindex | |
567 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex) | |
d62a17ae | 568 | return 1; |
569 | } | |
aadc0905 | 570 | |
d62a17ae | 571 | return 0; |
718e3744 | 572 | } |
573 | ||
d62a17ae | 574 | static void attrhash_init(void) |
718e3744 | 575 | { |
996c9314 LB |
576 | attrhash = |
577 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 578 | } |
579 | ||
289d2501 LB |
580 | /* |
581 | * special for hash_clean below | |
582 | */ | |
d62a17ae | 583 | static void attr_vfree(void *attr) |
289d2501 | 584 | { |
d62a17ae | 585 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
586 | } |
587 | ||
d62a17ae | 588 | static void attrhash_finish(void) |
228da428 | 589 | { |
d62a17ae | 590 | hash_clean(attrhash, attr_vfree); |
591 | hash_free(attrhash); | |
592 | attrhash = NULL; | |
228da428 CC |
593 | } |
594 | ||
d62a17ae | 595 | static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty) |
718e3744 | 596 | { |
d62a17ae | 597 | struct attr *attr = backet->data; |
718e3744 | 598 | |
d62a17ae | 599 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
600 | inet_ntoa(attr->nexthop)); | |
13b7e7f0 | 601 | vty_out(vty, "\tflags: %" PRIu64 " med: %u local_pref: %u origin: %u weight: %u label: %u\n", |
23a2a47e | 602 | attr->flag, attr->med, attr->local_pref, attr->origin, |
13b7e7f0 | 603 | attr->weight, attr->label); |
718e3744 | 604 | } |
605 | ||
d62a17ae | 606 | void attr_show_all(struct vty *vty) |
718e3744 | 607 | { |
9d303b37 DL |
608 | hash_iterate(attrhash, (void (*)(struct hash_backet *, |
609 | void *))attr_show_all_iterator, | |
610 | vty); | |
718e3744 | 611 | } |
612 | ||
d62a17ae | 613 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 614 | { |
d62a17ae | 615 | struct attr *val = (struct attr *)p; |
616 | struct attr *attr; | |
718e3744 | 617 | |
d62a17ae | 618 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
619 | *attr = *val; | |
620 | if (val->encap_subtlvs) { | |
621 | val->encap_subtlvs = NULL; | |
622 | } | |
65efcfce | 623 | #if ENABLE_BGP_VNC |
d62a17ae | 624 | if (val->vnc_subtlvs) { |
625 | val->vnc_subtlvs = NULL; | |
626 | } | |
65efcfce | 627 | #endif |
d62a17ae | 628 | attr->refcnt = 0; |
629 | return attr; | |
718e3744 | 630 | } |
631 | ||
632 | /* Internet argument attribute. */ | |
d62a17ae | 633 | struct attr *bgp_attr_intern(struct attr *attr) |
634 | { | |
635 | struct attr *find; | |
636 | ||
637 | /* Intern referenced strucutre. */ | |
638 | if (attr->aspath) { | |
639 | if (!attr->aspath->refcnt) | |
640 | attr->aspath = aspath_intern(attr->aspath); | |
641 | else | |
642 | attr->aspath->refcnt++; | |
643 | } | |
644 | if (attr->community) { | |
645 | if (!attr->community->refcnt) | |
646 | attr->community = community_intern(attr->community); | |
647 | else | |
648 | attr->community->refcnt++; | |
649 | } | |
650 | ||
651 | if (attr->ecommunity) { | |
652 | if (!attr->ecommunity->refcnt) | |
653 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
654 | else | |
655 | attr->ecommunity->refcnt++; | |
656 | } | |
657 | if (attr->lcommunity) { | |
658 | if (!attr->lcommunity->refcnt) | |
659 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
660 | else | |
661 | attr->lcommunity->refcnt++; | |
662 | } | |
663 | if (attr->cluster) { | |
664 | if (!attr->cluster->refcnt) | |
665 | attr->cluster = cluster_intern(attr->cluster); | |
666 | else | |
667 | attr->cluster->refcnt++; | |
668 | } | |
669 | if (attr->transit) { | |
670 | if (!attr->transit->refcnt) | |
671 | attr->transit = transit_intern(attr->transit); | |
672 | else | |
673 | attr->transit->refcnt++; | |
674 | } | |
675 | if (attr->encap_subtlvs) { | |
676 | if (!attr->encap_subtlvs->refcnt) | |
677 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
678 | ENCAP_SUBTLV_TYPE); | |
679 | else | |
680 | attr->encap_subtlvs->refcnt++; | |
681 | } | |
bede7744 | 682 | #if ENABLE_BGP_VNC |
d62a17ae | 683 | if (attr->vnc_subtlvs) { |
684 | if (!attr->vnc_subtlvs->refcnt) | |
685 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
686 | VNC_SUBTLV_TYPE); | |
687 | else | |
688 | attr->vnc_subtlvs->refcnt++; | |
689 | } | |
aadc0905 | 690 | #endif |
bede7744 | 691 | |
dbbac180 DL |
692 | /* At this point, attr only contains intern'd pointers. that means |
693 | * if we find it in attrhash, it has all the same pointers and we | |
694 | * correctly updated the refcounts on these. | |
695 | * If we don't find it, we need to allocate a one because in all | |
696 | * cases this returns a new reference to a hashed attr, but the input | |
697 | * wasn't on hash. */ | |
d62a17ae | 698 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
699 | find->refcnt++; | |
700 | ||
701 | return find; | |
718e3744 | 702 | } |
703 | ||
704 | /* Make network statement's attribute. */ | |
d7c0a89a | 705 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 706 | { |
d62a17ae | 707 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 708 | |
d62a17ae | 709 | attr->origin = origin; |
710 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
711 | attr->aspath = aspath_empty(); | |
712 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
713 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
714 | attr->tag = 0; | |
715 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
716 | attr->label = MPLS_INVALID_LABEL; | |
717 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
718 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
719 | ||
720 | return attr; | |
718e3744 | 721 | } |
722 | ||
b5d58c32 | 723 | /* Create the attributes for an aggregate */ |
d7c0a89a | 724 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, uint8_t origin, |
d62a17ae | 725 | struct aspath *aspath, |
726 | struct community *community, int as_set, | |
d7c0a89a | 727 | uint8_t atomic_aggregate) |
d62a17ae | 728 | { |
729 | struct attr attr; | |
730 | struct attr *new; | |
731 | ||
732 | memset(&attr, 0, sizeof(struct attr)); | |
733 | ||
734 | /* Origin attribute. */ | |
735 | attr.origin = origin; | |
736 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
737 | ||
738 | /* AS path attribute. */ | |
739 | if (aspath) | |
740 | attr.aspath = aspath_intern(aspath); | |
741 | else | |
742 | attr.aspath = aspath_empty(); | |
743 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
744 | ||
745 | /* Next hop attribute. */ | |
746 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
747 | ||
748 | if (community) { | |
d7c0a89a | 749 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
750 | |
751 | /* If we are not shutting down ourselves and we are | |
752 | * aggregating a route that contains the GSHUT community we | |
753 | * need to remove that community when creating the aggregate */ | |
996c9314 LB |
754 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) |
755 | && community_include(community, gshut)) { | |
7f323236 DW |
756 | community_del_val(community, &gshut); |
757 | } | |
758 | ||
d62a17ae | 759 | attr.community = community; |
760 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
761 | } | |
762 | ||
7f323236 DW |
763 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { |
764 | bgp_attr_add_gshut_community(&attr); | |
765 | } | |
766 | ||
d62a17ae | 767 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
768 | attr.label = MPLS_INVALID_LABEL; | |
769 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
770 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
771 | if (!as_set || atomic_aggregate) | |
772 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
773 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
774 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
775 | attr.aggregator_as = bgp->confed_id; | |
776 | else | |
777 | attr.aggregator_as = bgp->as; | |
778 | attr.aggregator_addr = bgp->router_id; | |
779 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
780 | attr.label = MPLS_INVALID_LABEL; | |
781 | ||
782 | new = bgp_attr_intern(&attr); | |
783 | ||
784 | aspath_unintern(&new->aspath); | |
785 | return new; | |
718e3744 | 786 | } |
787 | ||
b881c707 | 788 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 789 | void bgp_attr_unintern_sub(struct attr *attr) |
790 | { | |
791 | /* aspath refcount shoud be decrement. */ | |
792 | if (attr->aspath) | |
793 | aspath_unintern(&attr->aspath); | |
794 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
795 | ||
796 | if (attr->community) | |
797 | community_unintern(&attr->community); | |
798 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
799 | ||
800 | if (attr->ecommunity) | |
801 | ecommunity_unintern(&attr->ecommunity); | |
802 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
803 | ||
804 | if (attr->lcommunity) | |
805 | lcommunity_unintern(&attr->lcommunity); | |
806 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
807 | ||
808 | if (attr->cluster) | |
809 | cluster_unintern(attr->cluster); | |
810 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
811 | ||
812 | if (attr->transit) | |
813 | transit_unintern(attr->transit); | |
814 | ||
815 | if (attr->encap_subtlvs) | |
816 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
817 | |
818 | #if ENABLE_BGP_VNC | |
d62a17ae | 819 | if (attr->vnc_subtlvs) |
820 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 821 | #endif |
b881c707 PJ |
822 | } |
823 | ||
f46d8e1e DS |
824 | /* |
825 | * We have some show commands that let you experimentally | |
826 | * apply a route-map. When we apply the route-map | |
827 | * we are reseting values but not saving them for | |
828 | * posterity via intern'ing( because route-maps don't | |
829 | * do that) but at this point in time we need | |
830 | * to compare the new attr to the old and if the | |
831 | * routemap has changed it we need to, as Snoop Dog says, | |
832 | * Drop it like it's hot | |
833 | */ | |
834 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
835 | { | |
836 | if (new->aspath != old->aspath) | |
837 | aspath_free(new->aspath); | |
838 | ||
839 | if (new->community != old->community) | |
840 | community_free(new->community); | |
841 | ||
842 | if (new->ecommunity != old->ecommunity) | |
843 | ecommunity_free(&new->ecommunity); | |
844 | ||
845 | if (new->lcommunity != old->lcommunity) | |
846 | lcommunity_free(&new->lcommunity); | |
f46d8e1e DS |
847 | } |
848 | ||
718e3744 | 849 | /* Free bgp attribute and aspath. */ |
d62a17ae | 850 | void bgp_attr_unintern(struct attr **pattr) |
851 | { | |
852 | struct attr *attr = *pattr; | |
853 | struct attr *ret; | |
854 | struct attr tmp; | |
855 | ||
856 | /* Decrement attribute reference. */ | |
857 | attr->refcnt--; | |
858 | ||
859 | tmp = *attr; | |
860 | ||
861 | /* If reference becomes zero then free attribute object. */ | |
862 | if (attr->refcnt == 0) { | |
863 | ret = hash_release(attrhash, attr); | |
864 | assert(ret != NULL); | |
865 | XFREE(MTYPE_ATTR, attr); | |
866 | *pattr = NULL; | |
867 | } | |
868 | ||
869 | bgp_attr_unintern_sub(&tmp); | |
870 | } | |
871 | ||
872 | void bgp_attr_flush(struct attr *attr) | |
873 | { | |
874 | if (attr->aspath && !attr->aspath->refcnt) { | |
875 | aspath_free(attr->aspath); | |
876 | attr->aspath = NULL; | |
877 | } | |
878 | if (attr->community && !attr->community->refcnt) { | |
879 | community_free(attr->community); | |
880 | attr->community = NULL; | |
881 | } | |
882 | ||
883 | if (attr->ecommunity && !attr->ecommunity->refcnt) | |
884 | ecommunity_free(&attr->ecommunity); | |
885 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
886 | lcommunity_free(&attr->lcommunity); | |
887 | if (attr->cluster && !attr->cluster->refcnt) { | |
888 | cluster_free(attr->cluster); | |
889 | attr->cluster = NULL; | |
890 | } | |
891 | if (attr->transit && !attr->transit->refcnt) { | |
892 | transit_free(attr->transit); | |
893 | attr->transit = NULL; | |
894 | } | |
895 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
896 | encap_free(attr->encap_subtlvs); | |
897 | attr->encap_subtlvs = NULL; | |
898 | } | |
65efcfce | 899 | #if ENABLE_BGP_VNC |
d62a17ae | 900 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
901 | encap_free(attr->vnc_subtlvs); | |
902 | attr->vnc_subtlvs = NULL; | |
903 | } | |
aadc0905 | 904 | #endif |
718e3744 | 905 | } |
906 | ||
b881c707 PJ |
907 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
908 | * avoid resetting sessions for malformed attributes which are | |
909 | * are partial/optional and hence where the error likely was not | |
910 | * introduced by the sending neighbour. | |
911 | */ | |
912 | static bgp_attr_parse_ret_t | |
d7c0a89a | 913 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 914 | bgp_size_t length) |
915 | { | |
916 | struct peer *const peer = args->peer; | |
d7c0a89a | 917 | const uint8_t flags = args->flags; |
d62a17ae | 918 | /* startp and length must be special-cased, as whether or not to |
919 | * send the attribute data with the NOTIFY depends on the error, | |
920 | * the caller therefore signals this with the seperate length argument | |
921 | */ | |
d7c0a89a | 922 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 923 | |
924 | /* Only relax error handling for eBGP peers */ | |
925 | if (peer->sort != BGP_PEER_EBGP) { | |
926 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
927 | notify_datap, length); | |
928 | return BGP_ATTR_PARSE_ERROR; | |
929 | } | |
930 | ||
931 | /* Adjust the stream getp to the end of the attribute, in case we can | |
932 | * still proceed but the caller hasn't read all the attribute. | |
933 | */ | |
934 | stream_set_getp(BGP_INPUT(peer), | |
935 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
936 | + args->total); | |
937 | ||
938 | switch (args->type) { | |
939 | /* where an attribute is relatively inconsequential, e.g. it does not | |
940 | * affect route selection, and can be safely ignored, then any such | |
941 | * attributes which are malformed should just be ignored and the route | |
942 | * processed as normal. | |
943 | */ | |
944 | case BGP_ATTR_AS4_AGGREGATOR: | |
945 | case BGP_ATTR_AGGREGATOR: | |
946 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
947 | return BGP_ATTR_PARSE_PROCEED; | |
948 | ||
949 | /* Core attributes, particularly ones which may influence route | |
950 | * selection, should always cause session resets | |
951 | */ | |
952 | case BGP_ATTR_ORIGIN: | |
953 | case BGP_ATTR_AS_PATH: | |
954 | case BGP_ATTR_NEXT_HOP: | |
955 | case BGP_ATTR_MULTI_EXIT_DISC: | |
956 | case BGP_ATTR_LOCAL_PREF: | |
957 | case BGP_ATTR_COMMUNITIES: | |
958 | case BGP_ATTR_ORIGINATOR_ID: | |
959 | case BGP_ATTR_CLUSTER_LIST: | |
960 | case BGP_ATTR_MP_REACH_NLRI: | |
961 | case BGP_ATTR_MP_UNREACH_NLRI: | |
962 | case BGP_ATTR_EXT_COMMUNITIES: | |
963 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
964 | notify_datap, length); | |
965 | return BGP_ATTR_PARSE_ERROR; | |
966 | } | |
967 | ||
968 | /* Partial optional attributes that are malformed should not cause | |
969 | * the whole session to be reset. Instead treat it as a withdrawal | |
970 | * of the routes, if possible. | |
971 | */ | |
972 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
973 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
974 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
975 | return BGP_ATTR_PARSE_WITHDRAW; | |
976 | ||
977 | /* default to reset */ | |
978 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
979 | } |
980 | ||
afcb7679 DO |
981 | /* Find out what is wrong with the path attribute flag bits and log the error. |
982 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
983 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
984 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
985 | non-transitive" attribute. */ | |
986 | static void | |
d62a17ae | 987 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
988 | uint8_t desired_flags /* how RFC says it must be */ |
989 | ) | |
d62a17ae | 990 | { |
d7c0a89a QY |
991 | uint8_t seen = 0, i; |
992 | uint8_t real_flags = args->flags; | |
993 | const uint8_t attr_code = args->type; | |
d62a17ae | 994 | |
995 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
996 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
997 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
998 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
999 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
af4c2728 | 1000 | flog_err( |
14454c9f DS |
1001 | BGP_ERR_ATTR_FLAG, |
1002 | "%s attribute must%s be flagged as \"%s\"", | |
1003 | lookup_msg(attr_str, attr_code, NULL), | |
1004 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1005 | ? "" | |
1006 | : " not", | |
1007 | attr_flag_str[i].str); | |
d62a17ae | 1008 | seen = 1; |
1009 | } | |
1010 | if (!seen) { | |
1011 | zlog_debug( | |
1012 | "Strange, %s called for attr %s, but no problem found with flags" | |
1013 | " (real flags 0x%x, desired 0x%x)", | |
1014 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
1015 | real_flags, desired_flags); | |
1016 | } | |
afcb7679 DO |
1017 | } |
1018 | ||
3ecab4c8 PJ |
1019 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1020 | * as will PARTIAL for optional+transitive attributes. | |
1021 | */ | |
d7c0a89a QY |
1022 | const uint8_t attr_flags_values[] = { |
1023 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1024 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1025 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1026 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1027 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1028 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1029 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1030 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1031 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1032 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1033 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1034 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1035 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1036 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1037 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1038 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1039 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1040 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1041 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1042 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1043 | [BGP_ATTR_PREFIX_SID] = 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 | { | |
d7c0a89a QY |
1049 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1050 | const uint8_t flags = args->flags; | |
1051 | const uint8_t attr_code = args->type; | |
d62a17ae | 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)) { | |
af4c2728 | 1065 | flog_err( |
14454c9f | 1066 | BGP_ERR_ATTR_FLAG, |
d62a17ae | 1067 | "%s well-known attributes must have transitive flag set (%x)", |
1068 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1069 | return 1; | |
1070 | } | |
1071 | ||
1072 | /* "For well-known attributes and for optional non-transitive | |
1073 | * attributes, | |
1074 | * the Partial bit MUST be set to 0." | |
1075 | */ | |
1076 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1077 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
af4c2728 | 1078 | flog_err(BGP_ERR_ATTR_FLAG, |
14454c9f DS |
1079 | "%s well-known attribute " |
1080 | "must NOT have the partial flag set (%x)", | |
1081 | lookup_msg(attr_str, attr_code, NULL), flags); | |
d62a17ae | 1082 | return 1; |
1083 | } | |
1084 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1085 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
af4c2728 | 1086 | flog_err(BGP_ERR_ATTR_FLAG, |
14454c9f DS |
1087 | "%s optional + transitive attribute " |
1088 | "must NOT have the partial flag set (%x)", | |
1089 | lookup_msg(attr_str, attr_code, NULL), flags); | |
d62a17ae | 1090 | return 1; |
1091 | } | |
1092 | } | |
1093 | ||
1094 | /* Optional transitive attributes may go through speakers that don't | |
1095 | * reocgnise them and set the Partial bit. | |
1096 | */ | |
1097 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1098 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1099 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1100 | ||
1101 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1102 | return 0; | |
1103 | ||
1104 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1105 | return 1; | |
3ecab4c8 PJ |
1106 | } |
1107 | ||
718e3744 | 1108 | /* Get origin attribute of the update message. */ |
d62a17ae | 1109 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1110 | { | |
1111 | struct peer *const peer = args->peer; | |
1112 | struct attr *const attr = args->attr; | |
1113 | const bgp_size_t length = args->length; | |
1114 | ||
1115 | /* If any recognized attribute has Attribute Length that conflicts | |
1116 | with the expected length (based on the attribute type code), then | |
1117 | the Error Subcode is set to Attribute Length Error. The Data | |
1118 | field contains the erroneous attribute (type, length and | |
1119 | value). */ | |
1120 | if (length != 1) { | |
af4c2728 | 1121 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 1122 | "Origin attribute length is not one %d", length); |
d62a17ae | 1123 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1124 | args->total); | |
1125 | } | |
1126 | ||
1127 | /* Fetch origin attribute. */ | |
1128 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1129 | ||
1130 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1131 | Subcode is set to Invalid Origin Attribute. The Data field | |
1132 | contains the unrecognized attribute (type, length and value). */ | |
1133 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1134 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
af4c2728 | 1135 | flog_err(BGP_ERR_ATTR_ORIGIN, |
14454c9f | 1136 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1137 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1138 | args->total); | |
1139 | } | |
1140 | ||
1141 | /* Set oring attribute flag. */ | |
1142 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1143 | ||
1144 | return 0; | |
718e3744 | 1145 | } |
ab005298 PJ |
1146 | |
1147 | /* Parse AS path information. This function is wrapper of | |
1148 | aspath_parse. */ | |
d62a17ae | 1149 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1150 | { | |
1151 | struct attr *const attr = args->attr; | |
1152 | struct peer *const peer = args->peer; | |
1153 | const bgp_size_t length = args->length; | |
1154 | ||
1155 | /* | |
1156 | * peer with AS4 => will get 4Byte ASnums | |
1157 | * otherwise, will get 16 Bit | |
1158 | */ | |
424ab01d | 1159 | attr->aspath = aspath_parse(peer->curr, length, |
d62a17ae | 1160 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); |
1161 | ||
1162 | /* In case of IBGP, length will be zero. */ | |
1163 | if (!attr->aspath) { | |
af4c2728 | 1164 | flog_err(BGP_ERR_ATTR_MAL_AS_PATH, |
14454c9f DS |
1165 | "Malformed AS path from %s, length is %d", peer->host, |
1166 | length); | |
d62a17ae | 1167 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1168 | 0); | |
1169 | } | |
0b2aa3a0 | 1170 | |
d62a17ae | 1171 | /* Set aspath attribute flag. */ |
1172 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1173 | ||
1174 | return BGP_ATTR_PARSE_PROCEED; | |
1175 | } | |
1176 | ||
1177 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1178 | struct attr *const attr) | |
1179 | { | |
1180 | /* These checks were part of bgp_attr_aspath, but with | |
1181 | * as4 we should to check aspath things when | |
1182 | * aspath synthesizing with as4_path has already taken place. | |
1183 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1184 | * not right. | |
1185 | * So do the checks later, i.e. here | |
1186 | */ | |
d62a17ae | 1187 | struct aspath *aspath; |
1188 | ||
1189 | /* Confederation sanity check. */ | |
1190 | if ((peer->sort == BGP_PEER_CONFED | |
1191 | && !aspath_left_confed_check(attr->aspath)) | |
1192 | || (peer->sort == BGP_PEER_EBGP | |
1193 | && aspath_confed_check(attr->aspath))) { | |
af4c2728 | 1194 | flog_err(BGP_ERR_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
14454c9f | 1195 | peer->host); |
d62a17ae | 1196 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
1197 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1198 | return BGP_ATTR_PARSE_ERROR; | |
1199 | } | |
cddb8112 | 1200 | |
d62a17ae | 1201 | /* First AS check for EBGP. */ |
47cbc09b | 1202 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1203 | if (peer->sort == BGP_PEER_EBGP |
1204 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
af4c2728 | 1205 | flog_err(BGP_ERR_ATTR_FIRST_AS, |
14454c9f DS |
1206 | "%s incorrect first AS (must be %u)", |
1207 | peer->host, peer->as); | |
d62a17ae | 1208 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
1209 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1210 | return BGP_ATTR_PARSE_ERROR; | |
1211 | } | |
1212 | } | |
0b2aa3a0 | 1213 | |
d62a17ae | 1214 | /* local-as prepend */ |
1215 | if (peer->change_local_as | |
1216 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1217 | aspath = aspath_dup(attr->aspath); | |
1218 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1219 | aspath_unintern(&attr->aspath); | |
1220 | attr->aspath = aspath_intern(aspath); | |
1221 | } | |
0b2aa3a0 | 1222 | |
d62a17ae | 1223 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1224 | } |
1225 | ||
ab005298 PJ |
1226 | /* Parse AS4 path information. This function is another wrapper of |
1227 | aspath_parse. */ | |
d62a17ae | 1228 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1229 | struct aspath **as4_path) | |
ab005298 | 1230 | { |
d62a17ae | 1231 | struct peer *const peer = args->peer; |
1232 | struct attr *const attr = args->attr; | |
1233 | const bgp_size_t length = args->length; | |
ab005298 | 1234 | |
424ab01d | 1235 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1236 | |
d62a17ae | 1237 | /* In case of IBGP, length will be zero. */ |
1238 | if (!*as4_path) { | |
af4c2728 | 1239 | flog_err(BGP_ERR_ATTR_MAL_AS_PATH, |
14454c9f DS |
1240 | "Malformed AS4 path from %s, length is %d", |
1241 | peer->host, length); | |
d62a17ae | 1242 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1243 | 0); | |
1244 | } | |
ab005298 | 1245 | |
d62a17ae | 1246 | /* Set aspath attribute flag. */ |
1247 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1248 | ||
1249 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1250 | } |
1251 | ||
718e3744 | 1252 | /* Nexthop attribute. */ |
d62a17ae | 1253 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1254 | { | |
1255 | struct peer *const peer = args->peer; | |
1256 | struct attr *const attr = args->attr; | |
1257 | const bgp_size_t length = args->length; | |
1258 | ||
1259 | in_addr_t nexthop_h, nexthop_n; | |
1260 | ||
1261 | /* Check nexthop attribute length. */ | |
1262 | if (length != 4) { | |
af4c2728 | 1263 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 1264 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1265 | |
1266 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1267 | args->total); | |
1268 | } | |
1269 | ||
1270 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP | |
1271 | attribute must result in a NOTIFICATION message (this is implemented | |
1272 | below). | |
1273 | At the same time, semantically incorrect NEXT_HOP is more likely to | |
1274 | be just | |
1275 | logged locally (this is implemented somewhere else). The UPDATE | |
1276 | message | |
1277 | gets ignored in any of these cases. */ | |
424ab01d | 1278 | nexthop_n = stream_get_ipv4(peer->curr); |
d62a17ae | 1279 | nexthop_h = ntohl(nexthop_n); |
1280 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1281 | || IPV4_CLASS_DE(nexthop_h)) | |
1282 | && !BGP_DEBUG( | |
1283 | allow_martians, | |
1284 | ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
1285 | { | |
1286 | char buf[INET_ADDRSTRLEN]; | |
1287 | inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); | |
af4c2728 | 1288 | flog_err(BGP_ERR_ATTR_MARTIAN_NH, "Martian nexthop %s", buf); |
d62a17ae | 1289 | return bgp_attr_malformed( |
1290 | args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total); | |
1291 | } | |
1292 | ||
1293 | attr->nexthop.s_addr = nexthop_n; | |
1294 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1295 | ||
1296 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1297 | } |
1298 | ||
1299 | /* MED atrribute. */ | |
d62a17ae | 1300 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1301 | { |
d62a17ae | 1302 | struct peer *const peer = args->peer; |
1303 | struct attr *const attr = args->attr; | |
1304 | const bgp_size_t length = args->length; | |
b881c707 | 1305 | |
d62a17ae | 1306 | /* Length check. */ |
1307 | if (length != 4) { | |
af4c2728 | 1308 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 1309 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1310 | |
d62a17ae | 1311 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1312 | args->total); | |
1313 | } | |
1314 | ||
424ab01d | 1315 | attr->med = stream_getl(peer->curr); |
718e3744 | 1316 | |
d62a17ae | 1317 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1318 | |
d62a17ae | 1319 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1320 | } |
1321 | ||
1322 | /* Local preference attribute. */ | |
b881c707 | 1323 | static bgp_attr_parse_ret_t |
d62a17ae | 1324 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1325 | { | |
1326 | struct peer *const peer = args->peer; | |
1327 | struct attr *const attr = args->attr; | |
1328 | const bgp_size_t length = args->length; | |
1329 | ||
1330 | /* Length check. */ | |
1331 | if (length != 4) { | |
af4c2728 | 1332 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 1333 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1334 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1335 | args->total); | |
1336 | } | |
1337 | ||
1338 | /* If it is contained in an UPDATE message that is received from an | |
1339 | external peer, then this attribute MUST be ignored by the | |
1340 | receiving speaker. */ | |
1341 | if (peer->sort == BGP_PEER_EBGP) { | |
424ab01d | 1342 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1343 | return BGP_ATTR_PARSE_PROCEED; |
1344 | } | |
1345 | ||
424ab01d | 1346 | attr->local_pref = stream_getl(peer->curr); |
d62a17ae | 1347 | |
7f323236 | 1348 | /* Set the local-pref flag. */ |
d62a17ae | 1349 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1350 | ||
1351 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1352 | } |
1353 | ||
1354 | /* Atomic aggregate. */ | |
d62a17ae | 1355 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1356 | { |
d62a17ae | 1357 | struct attr *const attr = args->attr; |
1358 | const bgp_size_t length = args->length; | |
1359 | ||
1360 | /* Length check. */ | |
1361 | if (length != 0) { | |
af4c2728 | 1362 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f DS |
1363 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1364 | length); | |
d62a17ae | 1365 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1366 | args->total); | |
1367 | } | |
718e3744 | 1368 | |
d62a17ae | 1369 | /* Set atomic aggregate flag. */ |
1370 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1371 | |
d62a17ae | 1372 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1373 | } |
1374 | ||
1375 | /* Aggregator attribute */ | |
d62a17ae | 1376 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1377 | { | |
1378 | struct peer *const peer = args->peer; | |
1379 | struct attr *const attr = args->attr; | |
1380 | const bgp_size_t length = args->length; | |
1381 | ||
1382 | int wantedlen = 6; | |
1383 | ||
1384 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1385 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1386 | wantedlen = 8; | |
1387 | ||
1388 | if (length != wantedlen) { | |
af4c2728 | 1389 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f DS |
1390 | "AGGREGATOR attribute length isn't %u [%u]", |
1391 | wantedlen, length); | |
d62a17ae | 1392 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1393 | args->total); | |
1394 | } | |
1395 | ||
1396 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
424ab01d | 1397 | attr->aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1398 | else |
424ab01d QY |
1399 | attr->aggregator_as = stream_getw(peer->curr); |
1400 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1401 | |
1402 | /* Set atomic aggregate flag. */ | |
1403 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1404 | ||
1405 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1406 | } |
1407 | ||
0b2aa3a0 | 1408 | /* New Aggregator attribute */ |
b881c707 | 1409 | static bgp_attr_parse_ret_t |
d62a17ae | 1410 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1411 | as_t *as4_aggregator_as, | |
1412 | struct in_addr *as4_aggregator_addr) | |
1413 | { | |
1414 | struct peer *const peer = args->peer; | |
1415 | struct attr *const attr = args->attr; | |
1416 | const bgp_size_t length = args->length; | |
1417 | ||
1418 | if (length != 8) { | |
af4c2728 | 1419 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 1420 | "New Aggregator length is not 8 [%d]", length); |
d62a17ae | 1421 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1422 | 0); | |
1423 | } | |
1424 | ||
424ab01d QY |
1425 | *as4_aggregator_as = stream_getl(peer->curr); |
1426 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1427 | |
1428 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1429 | ||
1430 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1431 | } |
1432 | ||
1433 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1434 | */ | |
b881c707 | 1435 | static bgp_attr_parse_ret_t |
d62a17ae | 1436 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1437 | struct aspath *as4_path, as_t as4_aggregator, | |
1438 | struct in_addr *as4_aggregator_addr) | |
1439 | { | |
1440 | int ignore_as4_path = 0; | |
1441 | struct aspath *newpath; | |
1442 | ||
1443 | if (!attr->aspath) { | |
1444 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1445 | * have | |
1446 | * checked that all well-known, mandatory attributes were | |
1447 | * present. | |
1448 | * | |
1449 | * Can only be a problem with peer itself - hard error | |
1450 | */ | |
1451 | return BGP_ATTR_PARSE_ERROR; | |
1452 | } | |
1453 | ||
1454 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1455 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1456 | * if given. | |
1457 | * It is worth a warning though, because the peer really | |
1458 | * should not send them | |
1459 | */ | |
1460 | if (BGP_DEBUG(as4, AS4)) { | |
1461 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1462 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1463 | "AS4 capable peer, yet it sent"); | |
1464 | ||
1465 | if (attr->flag | |
1466 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1467 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1468 | peer->host, | |
1469 | "AS4 capable peer, yet it sent"); | |
1470 | } | |
1471 | ||
1472 | return BGP_ATTR_PARSE_PROCEED; | |
1473 | } | |
1474 | ||
1475 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1476 | * because that may override AS4_PATH | |
1477 | */ | |
1478 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1479 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1480 | /* received both. | |
1481 | * if the as_number in aggregator is not AS_TRANS, | |
1482 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1483 | * and the Aggregator shall be taken as | |
1484 | * info on the aggregating node, and the AS_PATH | |
1485 | * shall be taken as the AS_PATH | |
1486 | * otherwise | |
1487 | * the Aggregator shall be ignored and the | |
1488 | * AS4_AGGREGATOR shall be taken as the | |
1489 | * Aggregating node and the AS_PATH is to be | |
1490 | * constructed "as in all other cases" | |
1491 | */ | |
1492 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1493 | /* ignore */ | |
1494 | if (BGP_DEBUG(as4, AS4)) | |
1495 | zlog_debug( | |
1496 | "[AS4] %s BGP not AS4 capable peer" | |
1497 | " send AGGREGATOR != AS_TRANS and" | |
1498 | " AS4_AGGREGATOR, so ignore" | |
1499 | " AS4_AGGREGATOR and AS4_PATH", | |
1500 | peer->host); | |
1501 | ignore_as4_path = 1; | |
1502 | } else { | |
1503 | /* "New_aggregator shall be taken as aggregator" | |
1504 | */ | |
1505 | attr->aggregator_as = as4_aggregator; | |
1506 | attr->aggregator_addr.s_addr = | |
1507 | as4_aggregator_addr->s_addr; | |
1508 | } | |
1509 | } else { | |
1510 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1511 | * That is bogus - but reading the conditions | |
1512 | * we have to handle AS4_AGGREGATOR as if it were | |
1513 | * AGGREGATOR in that case | |
1514 | */ | |
1515 | if (BGP_DEBUG(as4, AS4)) | |
1516 | zlog_debug( | |
1517 | "[AS4] %s BGP not AS4 capable peer send" | |
1518 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1519 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1520 | peer->host); | |
1521 | attr->aggregator_as = as4_aggregator; | |
1522 | /* sweep it under the carpet and simulate a "good" | |
1523 | * AGGREGATOR */ | |
1524 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1529 | if (!ignore_as4_path | |
1530 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1531 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1532 | if (!newpath) |
1533 | return BGP_ATTR_PARSE_ERROR; | |
1534 | ||
d62a17ae | 1535 | aspath_unintern(&attr->aspath); |
1536 | attr->aspath = aspath_intern(newpath); | |
1537 | } | |
1538 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1539 | } |
1540 | ||
718e3744 | 1541 | /* Community attribute. */ |
b881c707 | 1542 | static bgp_attr_parse_ret_t |
d62a17ae | 1543 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1544 | { | |
1545 | struct peer *const peer = args->peer; | |
1546 | struct attr *const attr = args->attr; | |
1547 | const bgp_size_t length = args->length; | |
1548 | ||
1549 | if (length == 0) { | |
1550 | attr->community = NULL; | |
1551 | return BGP_ATTR_PARSE_PROCEED; | |
1552 | } | |
1553 | ||
1554 | attr->community = | |
d7c0a89a | 1555 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1556 | |
1557 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1558 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1559 | |
1560 | if (!attr->community) | |
1561 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1562 | args->total); | |
1563 | ||
1564 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1565 | ||
1566 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1567 | } |
1568 | ||
1569 | /* Originator ID attribute. */ | |
b881c707 | 1570 | static bgp_attr_parse_ret_t |
d62a17ae | 1571 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1572 | { |
d62a17ae | 1573 | struct peer *const peer = args->peer; |
1574 | struct attr *const attr = args->attr; | |
1575 | const bgp_size_t length = args->length; | |
718e3744 | 1576 | |
d62a17ae | 1577 | /* Length check. */ |
1578 | if (length != 4) { | |
af4c2728 | 1579 | flog_err(BGP_ERR_ATTR_LEN, "Bad originator ID length %d", |
14454c9f | 1580 | length); |
718e3744 | 1581 | |
d62a17ae | 1582 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1583 | args->total); | |
1584 | } | |
1585 | ||
424ab01d | 1586 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1587 | |
d62a17ae | 1588 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1589 | |
d62a17ae | 1590 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1591 | } |
1592 | ||
1593 | /* Cluster list attribute. */ | |
b881c707 | 1594 | static bgp_attr_parse_ret_t |
d62a17ae | 1595 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1596 | { |
d62a17ae | 1597 | struct peer *const peer = args->peer; |
1598 | struct attr *const attr = args->attr; | |
1599 | const bgp_size_t length = args->length; | |
1600 | ||
1601 | /* Check length. */ | |
1602 | if (length % 4) { | |
af4c2728 | 1603 | flog_err(BGP_ERR_ATTR_LEN, "Bad cluster list length %d", |
14454c9f | 1604 | length); |
718e3744 | 1605 | |
d62a17ae | 1606 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1607 | args->total); | |
1608 | } | |
1609 | ||
1610 | attr->cluster = | |
424ab01d | 1611 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); |
718e3744 | 1612 | |
d62a17ae | 1613 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 1614 | stream_forward_getp(peer->curr, length); |
718e3744 | 1615 | |
d62a17ae | 1616 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1617 | |
d62a17ae | 1618 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1619 | } |
1620 | ||
1621 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1622 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1623 | struct bgp_nlri *mp_update) | |
1624 | { | |
1625 | iana_afi_t pkt_afi; | |
1626 | afi_t afi; | |
5c525538 RW |
1627 | iana_safi_t pkt_safi; |
1628 | safi_t safi; | |
d62a17ae | 1629 | bgp_size_t nlri_len; |
1630 | size_t start; | |
1631 | struct stream *s; | |
1632 | struct peer *const peer = args->peer; | |
1633 | struct attr *const attr = args->attr; | |
1634 | const bgp_size_t length = args->length; | |
1635 | ||
1636 | /* Set end of packet. */ | |
1637 | s = BGP_INPUT(peer); | |
1638 | start = stream_get_getp(s); | |
1639 | ||
1640 | /* safe to read statically sized header? */ | |
6e4ab12f | 1641 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1642 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1643 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
1644 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1645 | peer->host, (unsigned long)length); | |
1646 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1647 | } | |
1648 | ||
1649 | /* Load AFI, SAFI. */ | |
1650 | pkt_afi = stream_getw(s); | |
1651 | pkt_safi = stream_getc(s); | |
1652 | ||
1653 | /* Convert AFI, SAFI to internal values, check. */ | |
1654 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1655 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1656 | * unless | |
1657 | * the attribute is otherwise malformed. | |
1658 | */ | |
1659 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1660 | zlog_debug( | |
1661 | "%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1662 | peer->host, pkt_afi, pkt_safi); | |
1663 | return BGP_ATTR_PARSE_ERROR; | |
1664 | } | |
1665 | ||
1666 | /* Get nexthop length. */ | |
1667 | attr->mp_nexthop_len = stream_getc(s); | |
1668 | ||
1669 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1670 | zlog_info( | |
1671 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1672 | __func__, peer->host, attr->mp_nexthop_len); | |
1673 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1674 | } | |
1675 | ||
1676 | /* Nexthop length check. */ | |
1677 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 1678 | case 0: |
1679 | if (safi != SAFI_FLOWSPEC) { | |
1680 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1681 | __func__, peer->host, attr->mp_nexthop_len); | |
1682 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1683 | } | |
1684 | break; | |
b6453163 LB |
1685 | case BGP_ATTR_NHLEN_VPNV4: |
1686 | stream_getl(s); /* RD high */ | |
1687 | stream_getl(s); /* RD low */ | |
996c9314 LB |
1688 | /* |
1689 | * NOTE: intentional fall through | |
1690 | * - for consistency in rx processing | |
1691 | * | |
1692 | * The following comment is to signal GCC this intention | |
1693 | * and supress the warning | |
1694 | */ | |
1695 | /* FALLTHRU */ | |
d62a17ae | 1696 | case BGP_ATTR_NHLEN_IPV4: |
1697 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1698 | /* Probably needed for RFC 2283 */ | |
1699 | if (attr->nexthop.s_addr == 0) | |
1700 | memcpy(&attr->nexthop.s_addr, | |
1701 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1702 | break; | |
d62a17ae | 1703 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
1704 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1705 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1706 | stream_getl(s); /* RD high */ | |
1707 | stream_getl(s); /* RD low */ | |
1708 | } | |
1709 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
77e62f2b | 1710 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) |
1711 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
d62a17ae | 1712 | break; |
1713 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1714 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1715 | if (attr->mp_nexthop_len | |
1716 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1717 | stream_getl(s); /* RD high */ | |
1718 | stream_getl(s); /* RD low */ | |
1719 | } | |
1720 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
77e62f2b | 1721 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) |
1722 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
d62a17ae | 1723 | if (attr->mp_nexthop_len |
1724 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1725 | stream_getl(s); /* RD high */ | |
1726 | stream_getl(s); /* RD low */ | |
1727 | } | |
1728 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1729 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1730 | char buf1[INET6_ADDRSTRLEN]; | |
1731 | char buf2[INET6_ADDRSTRLEN]; | |
1732 | ||
1733 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1734 | zlog_debug( | |
1735 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1736 | peer->host, | |
1737 | inet_ntop(AF_INET6, | |
1738 | &attr->mp_nexthop_global, | |
1739 | buf1, INET6_ADDRSTRLEN), | |
1740 | inet_ntop(AF_INET6, | |
1741 | &attr->mp_nexthop_local, buf2, | |
1742 | INET6_ADDRSTRLEN)); | |
1743 | ||
1744 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1745 | } | |
77e62f2b | 1746 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 1747 | break; |
1748 | default: | |
1749 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1750 | __func__, peer->host, attr->mp_nexthop_len); | |
1751 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1752 | } | |
1753 | ||
1754 | if (!LEN_LEFT) { | |
1755 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1756 | peer->host); | |
1757 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1758 | } | |
1759 | ||
718e3744 | 1760 | { |
d7c0a89a | 1761 | uint8_t val; |
d62a17ae | 1762 | if ((val = stream_getc(s))) |
1763 | zlog_warn( | |
1764 | "%s sent non-zero value, %u, for defunct SNPA-length field", | |
1765 | peer->host, val); | |
1766 | } | |
1767 | ||
1768 | /* must have nrli_len, what is left of the attribute */ | |
1769 | nlri_len = LEN_LEFT; | |
9b9df989 | 1770 | if (nlri_len > STREAM_READABLE(s)) { |
d62a17ae | 1771 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); |
1772 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1773 | } | |
1774 | ||
9b9df989 DS |
1775 | if (!nlri_len) { |
1776 | zlog_info("%s: (%s) No Reachability, Treating as a EOR marker", | |
1777 | __func__, peer->host); | |
1778 | ||
1779 | mp_update->afi = afi; | |
1780 | mp_update->safi = safi; | |
1781 | return BGP_ATTR_PARSE_EOR; | |
1782 | } | |
1783 | ||
d62a17ae | 1784 | mp_update->afi = afi; |
1785 | mp_update->safi = safi; | |
1786 | mp_update->nlri = stream_pnt(s); | |
1787 | mp_update->length = nlri_len; | |
1788 | ||
1789 | stream_forward_getp(s, nlri_len); | |
1790 | ||
1791 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1792 | ||
1793 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 1794 | #undef LEN_LEFT |
718e3744 | 1795 | } |
1796 | ||
1797 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 1798 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
1799 | struct bgp_nlri *mp_withdraw) | |
1800 | { | |
1801 | struct stream *s; | |
1802 | iana_afi_t pkt_afi; | |
1803 | afi_t afi; | |
5c525538 RW |
1804 | iana_safi_t pkt_safi; |
1805 | safi_t safi; | |
d7c0a89a | 1806 | uint16_t withdraw_len; |
d62a17ae | 1807 | struct peer *const peer = args->peer; |
1808 | struct attr *const attr = args->attr; | |
1809 | const bgp_size_t length = args->length; | |
9cabb64b | 1810 | |
424ab01d | 1811 | s = peer->curr; |
9cabb64b | 1812 | |
d62a17ae | 1813 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
1814 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1815 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1816 | ||
1817 | pkt_afi = stream_getw(s); | |
1818 | pkt_safi = stream_getc(s); | |
1819 | ||
1820 | /* Convert AFI, SAFI to internal values, check. */ | |
1821 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1822 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1823 | * unless | |
1824 | * the attribute is otherwise malformed. | |
1825 | */ | |
1826 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1827 | zlog_debug( | |
1828 | "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1829 | peer->host, pkt_afi, pkt_safi); | |
1830 | return BGP_ATTR_PARSE_ERROR; | |
1831 | } | |
718e3744 | 1832 | |
d62a17ae | 1833 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1834 | |
d62a17ae | 1835 | mp_withdraw->afi = afi; |
1836 | mp_withdraw->safi = safi; | |
1837 | mp_withdraw->nlri = stream_pnt(s); | |
1838 | mp_withdraw->length = withdraw_len; | |
718e3744 | 1839 | |
d62a17ae | 1840 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 1841 | |
d62a17ae | 1842 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
1843 | ||
1844 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1845 | } |
1846 | ||
57d187bc JS |
1847 | /* Large Community attribute. */ |
1848 | static bgp_attr_parse_ret_t | |
d62a17ae | 1849 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
1850 | { | |
1851 | struct peer *const peer = args->peer; | |
1852 | struct attr *const attr = args->attr; | |
1853 | const bgp_size_t length = args->length; | |
1854 | ||
1855 | /* | |
1856 | * Large community follows new attribute format. | |
1857 | */ | |
1858 | if (length == 0) { | |
1859 | attr->lcommunity = NULL; | |
1860 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1861 | return BGP_ATTR_PARSE_PROCEED; | |
1862 | } | |
57d187bc | 1863 | |
d62a17ae | 1864 | attr->lcommunity = |
d7c0a89a | 1865 | lcommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1866 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1867 | stream_forward_getp(peer->curr, length); |
57d187bc | 1868 | |
d62a17ae | 1869 | if (!attr->lcommunity) |
1870 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1871 | args->total); | |
57d187bc | 1872 | |
d62a17ae | 1873 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 1874 | |
d62a17ae | 1875 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
1876 | } |
1877 | ||
718e3744 | 1878 | /* Extended Community attribute. */ |
b881c707 | 1879 | static bgp_attr_parse_ret_t |
d62a17ae | 1880 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
1881 | { | |
1882 | struct peer *const peer = args->peer; | |
1883 | struct attr *const attr = args->attr; | |
1884 | const bgp_size_t length = args->length; | |
d7c0a89a | 1885 | uint8_t sticky = 0; |
d62a17ae | 1886 | |
1887 | if (length == 0) { | |
1888 | attr->ecommunity = NULL; | |
1889 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1890 | return BGP_ATTR_PARSE_PROCEED; | |
1891 | } | |
1892 | ||
1893 | attr->ecommunity = | |
d7c0a89a | 1894 | ecommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1895 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1896 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1897 | |
1898 | if (!attr->ecommunity) | |
1899 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1900 | args->total); | |
1901 | ||
1902 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1903 | ||
1904 | /* Extract MAC mobility sequence number, if any. */ | |
1905 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1906 | attr->sticky = sticky; | |
1907 | ||
ead40654 MK |
1908 | /* Check if this is a Gateway MAC-IP advertisement */ |
1909 | attr->default_gw = bgp_attr_default_gw(attr); | |
1910 | ||
68e33151 CS |
1911 | /* Handle scenario where router flag ecommunity is not |
1912 | * set but default gw ext community is present. | |
1913 | * Use default gateway, set and propogate R-bit. | |
1914 | */ | |
1915 | if (attr->default_gw) | |
1916 | attr->router_flag = 1; | |
1917 | ||
1918 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
1919 | bgp_attr_evpn_na_flag(attr, &attr->router_flag); | |
1920 | ||
bc59a672 MK |
1921 | /* Extract the Rmac, if any */ |
1922 | bgp_attr_rmac(attr, &attr->rmac); | |
1923 | ||
d62a17ae | 1924 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1925 | } |
1926 | ||
f4c89855 | 1927 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 1928 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
1929 | bgp_size_t length, /* IN: attr's length field */ | |
1930 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
1931 | uint8_t flag, /* IN: attr's flags field */ |
1932 | uint8_t *startp) | |
d62a17ae | 1933 | { |
1934 | bgp_size_t total; | |
d62a17ae | 1935 | uint16_t tunneltype = 0; |
1936 | ||
1937 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1938 | ||
1939 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1940 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1941 | zlog_info( | |
1942 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1943 | flag); | |
1944 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1945 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1946 | startp, total); | |
1947 | return -1; | |
1948 | } | |
1949 | ||
1950 | if (BGP_ATTR_ENCAP == type) { | |
1951 | /* read outer TLV type and length */ | |
1952 | uint16_t tlv_length; | |
1953 | ||
1954 | if (length < 4) { | |
1955 | zlog_info( | |
1956 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1957 | bgp_notify_send_with_data( | |
1958 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1959 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1960 | return -1; | |
1961 | } | |
1962 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
1963 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
1964 | length -= 4; | |
1965 | ||
1966 | if (tlv_length != length) { | |
1967 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
1968 | tlv_length, length); | |
1969 | } | |
1970 | } | |
1971 | ||
1972 | while (length >= 4) { | |
1973 | uint16_t subtype = 0; | |
1974 | uint16_t sublength = 0; | |
1975 | struct bgp_attr_encap_subtlv *tlv; | |
1976 | ||
1977 | if (BGP_ATTR_ENCAP == type) { | |
1978 | subtype = stream_getc(BGP_INPUT(peer)); | |
1979 | sublength = stream_getc(BGP_INPUT(peer)); | |
1980 | length -= 2; | |
65efcfce | 1981 | #if ENABLE_BGP_VNC |
d62a17ae | 1982 | } else { |
1983 | subtype = stream_getw(BGP_INPUT(peer)); | |
1984 | sublength = stream_getw(BGP_INPUT(peer)); | |
1985 | length -= 4; | |
65efcfce | 1986 | #endif |
d62a17ae | 1987 | } |
1988 | ||
1989 | if (sublength > length) { | |
1990 | zlog_info( | |
1991 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
1992 | sublength, length); | |
1993 | bgp_notify_send_with_data( | |
1994 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1995 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1996 | return -1; | |
1997 | } | |
1998 | ||
1999 | /* alloc and copy sub-tlv */ | |
2000 | /* TBD make sure these are freed when attributes are released */ | |
2001 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2002 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2003 | tlv->type = subtype; |
2004 | tlv->length = sublength; | |
424ab01d | 2005 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2006 | length -= sublength; |
2007 | ||
2008 | /* attach tlv to encap chain */ | |
2009 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2010 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2011 | for (stlv_last = attr->encap_subtlvs; |
2012 | stlv_last && stlv_last->next; | |
2013 | stlv_last = stlv_last->next) | |
2014 | ; | |
2015 | if (stlv_last) { | |
2016 | stlv_last->next = tlv; | |
2017 | } else { | |
2018 | attr->encap_subtlvs = tlv; | |
2019 | } | |
65efcfce | 2020 | #if ENABLE_BGP_VNC |
d62a17ae | 2021 | } else { |
e4002056 | 2022 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2023 | for (stlv_last = attr->vnc_subtlvs; |
2024 | stlv_last && stlv_last->next; | |
2025 | stlv_last = stlv_last->next) | |
2026 | ; | |
2027 | if (stlv_last) { | |
2028 | stlv_last->next = tlv; | |
2029 | } else { | |
2030 | attr->vnc_subtlvs = tlv; | |
2031 | } | |
aadc0905 | 2032 | #endif |
d62a17ae | 2033 | } |
d62a17ae | 2034 | } |
f4c89855 | 2035 | |
d62a17ae | 2036 | if (BGP_ATTR_ENCAP == type) { |
2037 | attr->encap_tunneltype = tunneltype; | |
2038 | } | |
f4c89855 | 2039 | |
d62a17ae | 2040 | if (length) { |
2041 | /* spurious leftover data */ | |
2042 | zlog_info( | |
2043 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2044 | length); | |
2045 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2046 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2047 | startp, total); | |
2048 | return -1; | |
2049 | } | |
f4c89855 | 2050 | |
d62a17ae | 2051 | return 0; |
f4c89855 LB |
2052 | } |
2053 | ||
30adbd4e DS |
2054 | /* |
2055 | * Read an individual SID value returning how much data we have read | |
2056 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2057 | */ |
30adbd4e DS |
2058 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(int32_t type, |
2059 | int32_t length, | |
2060 | struct bgp_attr_parser_args *args, | |
2061 | struct bgp_nlri *mp_update) | |
d62a17ae | 2062 | { |
2063 | struct peer *const peer = args->peer; | |
2064 | struct attr *const attr = args->attr; | |
d7c0a89a | 2065 | uint32_t label_index; |
d62a17ae | 2066 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2067 | uint32_t srgb_base; |
2068 | uint32_t srgb_range; | |
d62a17ae | 2069 | int srgb_count; |
2070 | ||
d62a17ae | 2071 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
2072 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
af4c2728 | 2073 | flog_err( |
14454c9f DS |
2074 | BGP_ERR_ATTR_LEN, |
2075 | "Prefix SID label index length is %d instead of %d", | |
2076 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
30adbd4e DS |
2077 | return bgp_attr_malformed(args, |
2078 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2079 | args->total); | |
d62a17ae | 2080 | } |
2081 | ||
2082 | /* Ignore flags and reserved */ | |
424ab01d QY |
2083 | stream_getc(peer->curr); |
2084 | stream_getw(peer->curr); | |
d62a17ae | 2085 | |
2086 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2087 | label_index = stream_getl(peer->curr); |
d62a17ae | 2088 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2089 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2090 | args->total); | |
d62a17ae | 2091 | |
2092 | /* Store label index; subsequently, we'll check on | |
2093 | * address-family */ | |
2094 | attr->label_index = label_index; | |
2095 | ||
2096 | /* | |
2097 | * Ignore the Label index attribute unless received for | |
2098 | * labeled-unicast | |
2099 | * SAFI. | |
2100 | */ | |
2101 | if (!mp_update->length | |
2102 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2103 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2104 | } | |
2105 | ||
2106 | /* Placeholder code for the IPv6 SID type */ | |
2107 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2108 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
af4c2728 | 2109 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f DS |
2110 | "Prefix SID IPv6 length is %d instead of %d", |
2111 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
30adbd4e DS |
2112 | return bgp_attr_malformed(args, |
2113 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2114 | args->total); | |
d62a17ae | 2115 | } |
2116 | ||
2117 | /* Ignore reserved */ | |
424ab01d QY |
2118 | stream_getc(peer->curr); |
2119 | stream_getw(peer->curr); | |
d62a17ae | 2120 | |
424ab01d | 2121 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2122 | } |
2123 | ||
2124 | /* Placeholder code for the Originator SRGB type */ | |
2125 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2126 | /* Ignore flags */ | |
424ab01d | 2127 | stream_getw(peer->curr); |
d62a17ae | 2128 | |
2129 | length -= 2; | |
2130 | ||
2131 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
af4c2728 | 2132 | flog_err( |
14454c9f | 2133 | BGP_ERR_ATTR_LEN, |
d62a17ae | 2134 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", |
2135 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2136 | return bgp_attr_malformed( | |
2137 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2138 | args->total); | |
2139 | } | |
2140 | ||
2141 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2142 | ||
2143 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2144 | stream_get(&srgb_base, peer->curr, 3); |
2145 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2146 | } |
2147 | } | |
2148 | ||
2149 | return BGP_ATTR_PARSE_PROCEED; | |
6cf48acc VV |
2150 | } |
2151 | ||
30adbd4e DS |
2152 | /* Prefix SID attribute |
2153 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2154 | */ | |
2155 | bgp_attr_parse_ret_t | |
2156 | bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args, | |
2157 | struct bgp_nlri *mp_update) | |
2158 | { | |
2159 | struct peer *const peer = args->peer; | |
2160 | struct attr *const attr = args->attr; | |
2161 | bgp_attr_parse_ret_t ret; | |
2162 | ||
2163 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2164 | ||
2165 | while (tlength) { | |
2166 | int32_t type, length; | |
2167 | ||
2168 | type = stream_getc(peer->curr); | |
2169 | length = stream_getw(peer->curr); | |
2170 | ||
2171 | ret = bgp_attr_psid_sub(type, length, args, mp_update); | |
2172 | ||
2173 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2174 | return ret; | |
2175 | /* | |
2176 | * Subtract length + the T and the L | |
2177 | * since length is the Vector portion | |
2178 | */ | |
2179 | tlength -= length + 3; | |
2180 | ||
2181 | if (tlength < 0) { | |
af4c2728 | 2182 | flog_err( |
14454c9f DS |
2183 | BGP_ERR_ATTR_LEN, |
2184 | "Prefix SID internal length %d causes us to read beyond the total Prefix SID length", | |
2185 | length); | |
30adbd4e DS |
2186 | return bgp_attr_malformed(args, |
2187 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2188 | args->total); | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | return BGP_ATTR_PARSE_PROCEED; | |
2193 | } | |
2194 | ||
7fd077aa | 2195 | /* PMSI tunnel attribute (RFC 6514) |
2196 | * Basic validation checks done here. | |
2197 | */ | |
2198 | static bgp_attr_parse_ret_t | |
2199 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2200 | { | |
2201 | struct peer *const peer = args->peer; | |
2202 | struct attr *const attr = args->attr; | |
2203 | const bgp_size_t length = args->length; | |
d7c0a89a | 2204 | uint8_t tnl_type; |
7fd077aa | 2205 | |
2206 | /* Verify that the receiver is expecting "ingress replication" as we | |
2207 | * can only support that. | |
2208 | */ | |
2209 | if (length < 2) { | |
af4c2728 | 2210 | flog_err(BGP_ERR_ATTR_LEN, |
14454c9f | 2211 | "Bad PMSI tunnel attribute length %d", length); |
7fd077aa | 2212 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2213 | args->total); | |
2214 | } | |
2215 | stream_getc(peer->curr); /* Flags */ | |
2216 | tnl_type = stream_getc(peer->curr); | |
2217 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
af4c2728 | 2218 | flog_err(BGP_ERR_ATTR_PMSI_TYPE, |
14454c9f | 2219 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 2220 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2221 | args->total); | |
2222 | } | |
2223 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2224 | if (length != 9) { | |
af4c2728 | 2225 | flog_err(BGP_ERR_ATTR_PMSI_LEN, |
14454c9f DS |
2226 | "Bad PMSI tunnel attribute length %d for IR", |
2227 | length); | |
052ea98b | 2228 | return bgp_attr_malformed( |
2229 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2230 | args->total); | |
7fd077aa | 2231 | } |
2232 | } | |
2233 | ||
2234 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2235 | attr->pmsi_tnl_type = tnl_type; | |
2236 | ||
2237 | /* Forward read pointer of input stream. */ | |
2238 | stream_forward_getp(peer->curr, length - 2); | |
2239 | ||
2240 | return BGP_ATTR_PARSE_PROCEED; | |
2241 | } | |
2242 | ||
718e3744 | 2243 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2244 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2245 | { | |
2246 | bgp_size_t total = args->total; | |
2247 | struct transit *transit; | |
2248 | struct peer *const peer = args->peer; | |
2249 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
2250 | uint8_t *const startp = args->startp; |
2251 | const uint8_t type = args->type; | |
2252 | const uint8_t flag = args->flags; | |
d62a17ae | 2253 | const bgp_size_t length = args->length; |
2254 | ||
2255 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2256 | zlog_debug( | |
2257 | "%s Unknown attribute is received (type %d, length %d)", | |
2258 | peer->host, type, length); | |
2259 | ||
2260 | /* Forward read pointer of input stream. */ | |
424ab01d | 2261 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2262 | |
2263 | /* If any of the mandatory well-known attributes are not recognized, | |
2264 | then the Error Subcode is set to Unrecognized Well-known | |
2265 | Attribute. The Data field contains the unrecognized attribute | |
2266 | (type, length and value). */ | |
2267 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2268 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2269 | args->total); | |
2270 | } | |
2271 | ||
2272 | /* Unrecognized non-transitive optional attributes must be quietly | |
2273 | ignored and not passed along to other BGP peers. */ | |
2274 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2275 | return BGP_ATTR_PARSE_PROCEED; | |
2276 | ||
2277 | /* If a path with recognized transitive optional attribute is | |
2278 | accepted and passed along to other BGP peers and the Partial bit | |
2279 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2280 | is not set back to 0 by the current AS. */ | |
2281 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2282 | ||
2283 | /* Store transitive attribute to the end of attr->transit. */ | |
2284 | if (!attr->transit) | |
2285 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2286 | ||
2287 | transit = attr->transit; | |
2288 | ||
2289 | if (transit->val) | |
2290 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2291 | transit->length + total); | |
2292 | else | |
2293 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2294 | ||
2295 | memcpy(transit->val + transit->length, startp, total); | |
2296 | transit->length += total; | |
2297 | ||
2298 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2299 | } |
2300 | ||
bb7bef14 | 2301 | /* Well-known attribute check. */ |
d62a17ae | 2302 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2303 | { | |
d7c0a89a | 2304 | uint8_t type = 0; |
d62a17ae | 2305 | |
2306 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2307 | * empty UPDATE. */ | |
2308 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2309 | return BGP_ATTR_PARSE_PROCEED; | |
2310 | ||
2311 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2312 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2313 | are present, it should. Check for any other attribute being present | |
2314 | instead. | |
2315 | */ | |
404c82d5 PG |
2316 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
2317 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 2318 | return BGP_ATTR_PARSE_PROCEED; |
2319 | ||
2320 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2321 | type = BGP_ATTR_ORIGIN; | |
2322 | ||
2323 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2324 | type = BGP_ATTR_AS_PATH; | |
2325 | ||
2326 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2327 | * and | |
2328 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2329 | */ | |
2330 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2331 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2332 | type = BGP_ATTR_NEXT_HOP; | |
2333 | ||
2334 | if (peer->sort == BGP_PEER_IBGP | |
2335 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2336 | type = BGP_ATTR_LOCAL_PREF; | |
2337 | ||
2338 | if (type) { | |
2339 | zlog_warn("%s Missing well-known attribute %s.", peer->host, | |
2340 | lookup_msg(attr_str, type, NULL)); | |
2341 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2342 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2343 | 1); | |
2344 | return BGP_ATTR_PARSE_ERROR; | |
2345 | } | |
2346 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2347 | } |
2348 | ||
718e3744 | 2349 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2350 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2351 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2352 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2353 | struct bgp_nlri *mp_withdraw) | |
2354 | { | |
2355 | int ret; | |
d7c0a89a QY |
2356 | uint8_t flag = 0; |
2357 | uint8_t type = 0; | |
d62a17ae | 2358 | bgp_size_t length; |
d7c0a89a QY |
2359 | uint8_t *startp, *endp; |
2360 | uint8_t *attr_endp; | |
2361 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 2362 | /* we need the as4_path only until we have synthesized the as_path with |
2363 | * it */ | |
2364 | /* same goes for as4_aggregator */ | |
2365 | struct aspath *as4_path = NULL; | |
2366 | as_t as4_aggregator = 0; | |
2367 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2368 | ||
2369 | /* Initialize bitmap. */ | |
2370 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2371 | ||
2372 | /* End pointer of BGP attribute. */ | |
2373 | endp = BGP_INPUT_PNT(peer) + size; | |
2374 | ||
2375 | /* Get attributes to the end of attribute length. */ | |
2376 | while (BGP_INPUT_PNT(peer) < endp) { | |
2377 | /* Check remaining length check.*/ | |
2378 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2379 | /* XXX warning: long int format, int arg (arg 5) */ | |
2380 | zlog_warn( | |
2381 | "%s: error BGP attribute length %lu is smaller than min len", | |
2382 | peer->host, | |
2383 | (unsigned long)(endp | |
2d34fb80 | 2384 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2385 | |
2386 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2387 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2388 | return BGP_ATTR_PARSE_ERROR; | |
2389 | } | |
718e3744 | 2390 | |
d62a17ae | 2391 | /* Fetch attribute flag and type. */ |
2392 | startp = BGP_INPUT_PNT(peer); | |
2393 | /* "The lower-order four bits of the Attribute Flags octet are | |
2394 | unused. They MUST be zero when sent and MUST be ignored when | |
2395 | received." */ | |
2396 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2397 | type = stream_getc(BGP_INPUT(peer)); | |
2398 | ||
2399 | /* Check whether Extended-Length applies and is in bounds */ | |
2400 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2401 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
2402 | zlog_warn( | |
2403 | "%s: Extended length set, but just %lu bytes of attr header", | |
2404 | peer->host, | |
2405 | (unsigned long)(endp | |
2d34fb80 | 2406 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2407 | |
2408 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2409 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2410 | return BGP_ATTR_PARSE_ERROR; | |
2411 | } | |
718e3744 | 2412 | |
d62a17ae | 2413 | /* Check extended attribue length bit. */ |
2414 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2415 | length = stream_getw(BGP_INPUT(peer)); | |
2416 | else | |
2417 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2418 | |
d62a17ae | 2419 | /* If any attribute appears more than once in the UPDATE |
2420 | message, then the Error Subcode is set to Malformed Attribute | |
2421 | List. */ | |
718e3744 | 2422 | |
d62a17ae | 2423 | if (CHECK_BITMAP(seen, type)) { |
2424 | zlog_warn( | |
2425 | "%s: error BGP attribute type %d appears twice in a message", | |
2426 | peer->host, type); | |
718e3744 | 2427 | |
d62a17ae | 2428 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2429 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2430 | return BGP_ATTR_PARSE_ERROR; | |
2431 | } | |
2432 | ||
2433 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2434 | unsigned char so it never overflow bitmap range. */ | |
2435 | ||
2436 | SET_BITMAP(seen, type); | |
2437 | ||
2438 | /* Overflow check. */ | |
2439 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2440 | ||
2441 | if (attr_endp > endp) { | |
2442 | zlog_warn( | |
2443 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", | |
2444 | peer->host, type, length, size, attr_endp, | |
2445 | endp); | |
dacffad4 QY |
2446 | /* |
2447 | * RFC 4271 6.3 | |
2448 | * If any recognized attribute has an Attribute | |
2449 | * Length that conflicts with the expected length | |
2450 | * (based on the attribute type code), then the | |
2451 | * Error Subcode MUST be set to Attribute Length | |
2452 | * Error. The Data field MUST contain the erroneous | |
2453 | * attribute (type, length, and value). | |
2454 | * ---------- | |
2455 | * We do not currently have a good way to determine the | |
2456 | * length of the attribute independent of the length | |
2457 | * received in the message. Instead we send the | |
2458 | * minimum between the amount of data we have and the | |
2459 | * amount specified by the attribute length field. | |
2460 | * | |
2461 | * Instead of directly passing in the packet buffer and | |
2462 | * offset we use the stream_get* functions to read into | |
2463 | * a stack buffer, since they perform bounds checking | |
2464 | * and we are working with untrusted data. | |
2465 | */ | |
2466 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
2467 | memset(ndata, 0x00, sizeof(ndata)); | |
2468 | size_t lfl = | |
2469 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
2470 | /* Rewind to end of flag field */ | |
2471 | stream_forward_getp(BGP_INPUT(peer), -(1 + lfl)); | |
2472 | /* Type */ | |
2473 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
2474 | /* Length */ | |
2475 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
2476 | /* Value */ | |
2477 | size_t atl = attr_endp - startp; | |
2478 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
2479 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
2480 | ||
d62a17ae | 2481 | bgp_notify_send_with_data( |
2482 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
2483 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
2484 | ndl + lfl + 1); | |
2485 | ||
d62a17ae | 2486 | return BGP_ATTR_PARSE_ERROR; |
2487 | } | |
2488 | ||
2489 | struct bgp_attr_parser_args attr_args = { | |
2490 | .peer = peer, | |
2491 | .length = length, | |
2492 | .attr = attr, | |
2493 | .type = type, | |
2494 | .flags = flag, | |
2495 | .startp = startp, | |
2496 | .total = attr_endp - startp, | |
2497 | }; | |
2498 | ||
2499 | ||
2500 | /* If any recognized attribute has Attribute Flags that conflict | |
2501 | with the Attribute Type Code, then the Error Subcode is set | |
2502 | to | |
2503 | Attribute Flags Error. The Data field contains the erroneous | |
2504 | attribute (type, length and value). */ | |
2505 | if (bgp_attr_flag_invalid(&attr_args)) { | |
2506 | bgp_attr_parse_ret_t ret; | |
2507 | ret = bgp_attr_malformed( | |
2508 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2509 | attr_args.total); | |
2510 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2511 | continue; | |
2512 | return ret; | |
2513 | } | |
2514 | ||
2515 | /* OK check attribute and store it's value. */ | |
2516 | switch (type) { | |
2517 | case BGP_ATTR_ORIGIN: | |
2518 | ret = bgp_attr_origin(&attr_args); | |
2519 | break; | |
2520 | case BGP_ATTR_AS_PATH: | |
2521 | ret = bgp_attr_aspath(&attr_args); | |
2522 | break; | |
2523 | case BGP_ATTR_AS4_PATH: | |
2524 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2525 | break; | |
2526 | case BGP_ATTR_NEXT_HOP: | |
2527 | ret = bgp_attr_nexthop(&attr_args); | |
2528 | break; | |
2529 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2530 | ret = bgp_attr_med(&attr_args); | |
2531 | break; | |
2532 | case BGP_ATTR_LOCAL_PREF: | |
2533 | ret = bgp_attr_local_pref(&attr_args); | |
2534 | break; | |
2535 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2536 | ret = bgp_attr_atomic(&attr_args); | |
2537 | break; | |
2538 | case BGP_ATTR_AGGREGATOR: | |
2539 | ret = bgp_attr_aggregator(&attr_args); | |
2540 | break; | |
2541 | case BGP_ATTR_AS4_AGGREGATOR: | |
2542 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2543 | &as4_aggregator, | |
2544 | &as4_aggregator_addr); | |
2545 | break; | |
2546 | case BGP_ATTR_COMMUNITIES: | |
2547 | ret = bgp_attr_community(&attr_args); | |
2548 | break; | |
2549 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2550 | ret = bgp_attr_large_community(&attr_args); | |
2551 | break; | |
2552 | case BGP_ATTR_ORIGINATOR_ID: | |
2553 | ret = bgp_attr_originator_id(&attr_args); | |
2554 | break; | |
2555 | case BGP_ATTR_CLUSTER_LIST: | |
2556 | ret = bgp_attr_cluster_list(&attr_args); | |
2557 | break; | |
2558 | case BGP_ATTR_MP_REACH_NLRI: | |
2559 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2560 | break; | |
2561 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2562 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2563 | break; | |
2564 | case BGP_ATTR_EXT_COMMUNITIES: | |
2565 | ret = bgp_attr_ext_communities(&attr_args); | |
2566 | break; | |
65efcfce | 2567 | #if ENABLE_BGP_VNC |
d62a17ae | 2568 | case BGP_ATTR_VNC: |
65efcfce | 2569 | #endif |
d62a17ae | 2570 | case BGP_ATTR_ENCAP: |
2571 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2572 | startp); | |
2573 | break; | |
2574 | case BGP_ATTR_PREFIX_SID: | |
30adbd4e DS |
2575 | ret = bgp_attr_prefix_sid(length, |
2576 | &attr_args, mp_update); | |
d62a17ae | 2577 | break; |
7fd077aa | 2578 | case BGP_ATTR_PMSI_TUNNEL: |
2579 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
2580 | break; | |
d62a17ae | 2581 | default: |
2582 | ret = bgp_attr_unknown(&attr_args); | |
2583 | break; | |
2584 | } | |
2585 | ||
2586 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2587 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2588 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2589 | ret = BGP_ATTR_PARSE_ERROR; | |
2590 | } | |
2591 | ||
9b9df989 DS |
2592 | if (ret == BGP_ATTR_PARSE_EOR) { |
2593 | if (as4_path) | |
2594 | aspath_unintern(&as4_path); | |
2595 | return ret; | |
2596 | } | |
2597 | ||
d62a17ae | 2598 | /* If hard error occured immediately return to the caller. */ |
2599 | if (ret == BGP_ATTR_PARSE_ERROR) { | |
2600 | zlog_warn("%s: Attribute %s, parse error", peer->host, | |
2601 | lookup_msg(attr_str, type, NULL)); | |
2602 | if (as4_path) | |
2603 | aspath_unintern(&as4_path); | |
2604 | return ret; | |
2605 | } | |
2606 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2607 | ||
2608 | zlog_warn( | |
2609 | "%s: Attribute %s, parse error - treating as withdrawal", | |
2610 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2611 | if (as4_path) | |
2612 | aspath_unintern(&as4_path); | |
2613 | return ret; | |
2614 | } | |
2615 | ||
2616 | /* Check the fetched length. */ | |
2617 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
2618 | zlog_warn("%s: BGP attribute %s, fetch error", | |
2619 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2620 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2621 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2622 | if (as4_path) | |
2623 | aspath_unintern(&as4_path); | |
2624 | return BGP_ATTR_PARSE_ERROR; | |
2625 | } | |
718e3744 | 2626 | } |
d62a17ae | 2627 | |
2628 | /* Check final read pointer is same as end pointer. */ | |
2629 | if (BGP_INPUT_PNT(peer) != endp) { | |
2630 | zlog_warn("%s: BGP attribute %s, length mismatch", peer->host, | |
2631 | lookup_msg(attr_str, type, NULL)); | |
2632 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2633 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2634 | if (as4_path) | |
2635 | aspath_unintern(&as4_path); | |
2636 | return BGP_ATTR_PARSE_ERROR; | |
2637 | } | |
2638 | ||
2639 | /* Check all mandatory well-known attributes are present */ | |
718e3744 | 2640 | { |
d62a17ae | 2641 | bgp_attr_parse_ret_t ret; |
2642 | if ((ret = bgp_attr_check(peer, attr)) < 0) { | |
2643 | if (as4_path) | |
2644 | aspath_unintern(&as4_path); | |
2645 | return ret; | |
2646 | } | |
2647 | } | |
2648 | ||
2649 | /* | |
2650 | * At this place we can see whether we got AS4_PATH and/or | |
2651 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2652 | * We can not do this before we've read all attributes because | |
2653 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2654 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2655 | * in relationship to AGGREGATOR. | |
2656 | * So, to be defensive, we are not relying on any order and read | |
2657 | * all attributes first, including these 32bit ones, and now, | |
2658 | * afterwards, we look what and if something is to be done for as4. | |
2659 | * | |
2660 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2661 | * MP_UNREACH_NLRI. | |
2662 | */ | |
2663 | /* actually... this doesn't ever return failure currently, but | |
2664 | * better safe than sorry */ | |
2665 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2666 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2667 | &as4_aggregator_addr)) { | |
2668 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2669 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2670 | if (as4_path) | |
2671 | aspath_unintern(&as4_path); | |
2672 | return BGP_ATTR_PARSE_ERROR; | |
2673 | } | |
2674 | ||
2675 | /* At this stage, we have done all fiddling with as4, and the | |
2676 | * resulting info is in attr->aggregator resp. attr->aspath | |
2677 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2678 | * order to save memory | |
2679 | */ | |
2680 | if (as4_path) { | |
2681 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2682 | /* The flag that we got this is still there, but that does not | |
2683 | * do any trouble | |
2684 | */ | |
2685 | } | |
2686 | /* | |
2687 | * The "rest" of the code does nothing with as4_aggregator. | |
2688 | * there is no memory attached specifically which is not part | |
2689 | * of the attr. | |
2690 | * so ignoring just means do nothing. | |
2691 | */ | |
2692 | /* | |
2693 | * Finally do the checks on the aspath we did not do yet | |
2694 | * because we waited for a potentially synthesized aspath. | |
2695 | */ | |
2696 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2697 | ret = bgp_attr_aspath_check(peer, attr); | |
2698 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2699 | return ret; | |
2700 | } | |
2701 | /* Finally intern unknown attribute. */ | |
2702 | if (attr->transit) | |
2703 | attr->transit = transit_intern(attr->transit); | |
2704 | if (attr->encap_subtlvs) | |
2705 | attr->encap_subtlvs = | |
2706 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2707 | #if ENABLE_BGP_VNC |
d62a17ae | 2708 | if (attr->vnc_subtlvs) |
2709 | attr->vnc_subtlvs = | |
2710 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2711 | #endif |
718e3744 | 2712 | |
d62a17ae | 2713 | return BGP_ATTR_PARSE_PROCEED; |
2714 | } | |
2715 | ||
2716 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, | |
2717 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2718 | struct attr *attr) | |
2719 | { | |
2720 | size_t sizep; | |
2721 | iana_afi_t pkt_afi; | |
5c525538 | 2722 | iana_safi_t pkt_safi; |
d62a17ae | 2723 | afi_t nh_afi; |
2724 | ||
2725 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2726 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2727 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2728 | sizep = stream_get_endp(s); | |
2729 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2730 | ||
2731 | ||
2732 | /* Convert AFI, SAFI to values for packet. */ | |
2733 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2734 | ||
2735 | stream_putw(s, pkt_afi); /* AFI */ | |
2736 | stream_putc(s, pkt_safi); /* SAFI */ | |
2737 | ||
2738 | /* Nexthop AFI */ | |
ce78a6fb | 2739 | if (afi == AFI_IP |
2740 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
d62a17ae | 2741 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
d62a17ae | 2742 | else |
2743 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2744 | ||
2745 | /* Nexthop */ | |
2746 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2747 | switch (nh_afi) { | |
2748 | case AFI_IP: | |
2749 | switch (safi) { | |
2750 | case SAFI_UNICAST: | |
2751 | case SAFI_MULTICAST: | |
2752 | case SAFI_LABELED_UNICAST: | |
2753 | stream_putc(s, 4); | |
2754 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2755 | break; | |
2756 | case SAFI_MPLS_VPN: | |
2757 | stream_putc(s, 12); | |
2758 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2759 | stream_putl(s, 0); | |
2760 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2761 | break; | |
2762 | case SAFI_ENCAP: | |
2763 | case SAFI_EVPN: | |
2764 | stream_putc(s, 4); | |
2765 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2766 | break; | |
7c40bf39 | 2767 | case SAFI_FLOWSPEC: |
2768 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2769 | default: |
2770 | break; | |
2771 | } | |
2772 | break; | |
2773 | case AFI_IP6: | |
2774 | switch (safi) { | |
2775 | case SAFI_UNICAST: | |
2776 | case SAFI_MULTICAST: | |
2777 | case SAFI_LABELED_UNICAST: | |
2778 | case SAFI_EVPN: { | |
2779 | if (attr->mp_nexthop_len | |
2780 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2781 | stream_putc(s, | |
2782 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2783 | stream_put(s, &attr->mp_nexthop_global, | |
2784 | IPV6_MAX_BYTELEN); | |
2785 | stream_put(s, &attr->mp_nexthop_local, | |
2786 | IPV6_MAX_BYTELEN); | |
2787 | } else { | |
2788 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2789 | stream_put(s, &attr->mp_nexthop_global, | |
2790 | IPV6_MAX_BYTELEN); | |
2791 | } | |
2792 | } break; | |
2793 | case SAFI_MPLS_VPN: { | |
2794 | if (attr->mp_nexthop_len | |
2795 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2796 | stream_putc(s, 24); | |
2797 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2798 | stream_putl(s, 0); | |
2799 | stream_put(s, &attr->mp_nexthop_global, | |
2800 | IPV6_MAX_BYTELEN); | |
2801 | } else if (attr->mp_nexthop_len | |
2802 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2803 | stream_putc(s, 48); | |
2804 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2805 | stream_putl(s, 0); | |
2806 | stream_put(s, &attr->mp_nexthop_global, | |
2807 | IPV6_MAX_BYTELEN); | |
2808 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2809 | stream_putl(s, 0); | |
2810 | stream_put(s, &attr->mp_nexthop_local, | |
2811 | IPV6_MAX_BYTELEN); | |
2812 | } | |
2813 | } break; | |
2814 | case SAFI_ENCAP: | |
2815 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2816 | stream_put(s, &attr->mp_nexthop_global, | |
2817 | IPV6_MAX_BYTELEN); | |
2818 | break; | |
7c40bf39 | 2819 | case SAFI_FLOWSPEC: |
2820 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2821 | default: |
2822 | break; | |
2823 | } | |
2824 | break; | |
8c71e481 | 2825 | default: |
a83da8e1 | 2826 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 2827 | flog_err( |
14454c9f DS |
2828 | BGP_ERR_ATTR_NH_SEND_LEN, |
2829 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", | |
2830 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 2831 | break; |
2832 | } | |
2833 | ||
2834 | /* SNPA */ | |
2835 | stream_putc(s, 0); | |
2836 | return sizep; | |
2837 | } | |
2838 | ||
2839 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2840 | struct prefix *p, struct prefix_rd *prd, | |
d7c0a89a QY |
2841 | mpls_label_t *label, uint32_t num_labels, |
2842 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 2843 | struct attr *attr) |
d62a17ae | 2844 | { |
2845 | if (safi == SAFI_MPLS_VPN) { | |
2846 | if (addpath_encode) | |
2847 | stream_putl(s, addpath_tx_id); | |
2848 | /* Label, RD, Prefix write. */ | |
2849 | stream_putc(s, p->prefixlen + 88); | |
2850 | stream_put(s, label, BGP_LABEL_BYTES); | |
2851 | stream_put(s, prd->val, 8); | |
2852 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2853 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2854 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
2855 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
2856 | addpath_encode, addpath_tx_id); | |
d62a17ae | 2857 | } else if (safi == SAFI_LABELED_UNICAST) { |
2858 | /* Prefix write with label. */ | |
2859 | stream_put_labeled_prefix(s, p, label); | |
7c40bf39 | 2860 | } else if (safi == SAFI_FLOWSPEC) { |
2861 | if (PSIZE (p->prefixlen)+2 < FLOWSPEC_NLRI_SIZELIMIT) | |
2862 | stream_putc(s, PSIZE (p->prefixlen)+2); | |
2863 | else | |
2864 | stream_putw(s, (PSIZE (p->prefixlen)+2)|(0xf<<12)); | |
2865 | stream_putc(s, 2);/* Filter type */ | |
2866 | stream_putc(s, p->prefixlen);/* Prefix length */ | |
2867 | stream_put(s, &p->u.prefix, PSIZE (p->prefixlen)); | |
d62a17ae | 2868 | } else |
2869 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2870 | } | |
2871 | ||
2872 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2873 | { | |
2874 | int size = PSIZE(p->prefixlen); | |
2875 | if (safi == SAFI_MPLS_VPN) | |
2876 | size += 88; | |
2877 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2878 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2879 | // type-5 | |
2880 | return size; | |
8c71e481 PM |
2881 | } |
2882 | ||
f4c89855 | 2883 | /* |
65efcfce | 2884 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 2885 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 2886 | * almost the same TLV format |
f4c89855 | 2887 | */ |
d62a17ae | 2888 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
2889 | struct stream *s, struct attr *attr, | |
2890 | uint8_t attrtype) | |
2891 | { | |
2892 | unsigned int attrlenfield = 0; | |
2893 | unsigned int attrhdrlen = 0; | |
2894 | struct bgp_attr_encap_subtlv *subtlvs; | |
2895 | struct bgp_attr_encap_subtlv *st; | |
2896 | const char *attrname; | |
2897 | ||
9d303b37 DL |
2898 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
2899 | && (!attr->encap_tunneltype | |
2900 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 2901 | return; |
2902 | ||
2903 | switch (attrtype) { | |
f4c89855 | 2904 | case BGP_ATTR_ENCAP: |
d62a17ae | 2905 | attrname = "Tunnel Encap"; |
2906 | subtlvs = attr->encap_subtlvs; | |
2907 | if (subtlvs == NULL) /* nothing to do */ | |
2908 | return; | |
2909 | /* | |
2910 | * The tunnel encap attr has an "outer" tlv. | |
2911 | * T = tunneltype, | |
2912 | * L = total length of subtlvs, | |
2913 | * V = concatenated subtlvs. | |
2914 | */ | |
2915 | attrlenfield = 2 + 2; /* T + L */ | |
2916 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
2917 | break; | |
f4c89855 | 2918 | |
65efcfce LB |
2919 | #if ENABLE_BGP_VNC |
2920 | case BGP_ATTR_VNC: | |
d62a17ae | 2921 | attrname = "VNC"; |
2922 | subtlvs = attr->vnc_subtlvs; | |
2923 | if (subtlvs == NULL) /* nothing to do */ | |
2924 | return; | |
2925 | attrlenfield = 0; /* no outer T + L */ | |
2926 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2927 | break; | |
65efcfce LB |
2928 | #endif |
2929 | ||
f4c89855 | 2930 | default: |
d62a17ae | 2931 | assert(0); |
2932 | } | |
2933 | ||
2934 | /* compute attr length */ | |
2935 | for (st = subtlvs; st; st = st->next) { | |
2936 | attrlenfield += (attrhdrlen + st->length); | |
2937 | } | |
2938 | ||
2939 | if (attrlenfield > 0xffff) { | |
2940 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
2941 | attrname, attrlenfield); | |
2942 | return; | |
2943 | } | |
2944 | ||
2945 | if (attrlenfield > 0xff) { | |
2946 | /* 2-octet length field */ | |
996c9314 LB |
2947 | stream_putc(s, |
2948 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
2949 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2950 | stream_putc(s, attrtype); |
2951 | stream_putw(s, attrlenfield & 0xffff); | |
2952 | } else { | |
2953 | /* 1-octet length field */ | |
2954 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
2955 | stream_putc(s, attrtype); | |
2956 | stream_putc(s, attrlenfield & 0xff); | |
2957 | } | |
2958 | ||
2959 | if (attrtype == BGP_ATTR_ENCAP) { | |
2960 | /* write outer T+L */ | |
2961 | stream_putw(s, attr->encap_tunneltype); | |
2962 | stream_putw(s, attrlenfield - 4); | |
2963 | } | |
2964 | ||
2965 | /* write each sub-tlv */ | |
2966 | for (st = subtlvs; st; st = st->next) { | |
2967 | if (attrtype == BGP_ATTR_ENCAP) { | |
2968 | stream_putc(s, st->type); | |
2969 | stream_putc(s, st->length); | |
65efcfce | 2970 | #if ENABLE_BGP_VNC |
d62a17ae | 2971 | } else { |
2972 | stream_putw(s, st->type); | |
2973 | stream_putw(s, st->length); | |
65efcfce | 2974 | #endif |
d62a17ae | 2975 | } |
2976 | stream_put(s, st->value, st->length); | |
2977 | } | |
f4c89855 | 2978 | } |
f4c89855 | 2979 | |
d62a17ae | 2980 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 2981 | { |
d62a17ae | 2982 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
2983 | the attr length */ | |
2984 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
2985 | } |
2986 | ||
718e3744 | 2987 | /* Make attribute packet. */ |
d62a17ae | 2988 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
2989 | struct stream *s, struct attr *attr, | |
2990 | struct bpacket_attr_vec_arr *vecarr, | |
2991 | struct prefix *p, afi_t afi, safi_t safi, | |
2992 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
2993 | mpls_label_t *label, uint32_t num_labels, |
2994 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 2995 | { |
2996 | size_t cp; | |
2997 | size_t aspath_sizep; | |
2998 | struct aspath *aspath; | |
2999 | int send_as4_path = 0; | |
3000 | int send_as4_aggregator = 0; | |
3001 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
3002 | ||
3003 | if (!bgp) | |
3004 | bgp = peer->bgp; | |
3005 | ||
3006 | /* Remember current pointer. */ | |
3007 | cp = stream_get_endp(s); | |
3008 | ||
3009 | if (p | |
3010 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3011 | && !peer_cap_enhe(peer, afi, safi))) { | |
3012 | size_t mpattrlen_pos = 0; | |
3013 | ||
3014 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3015 | vecarr, attr); | |
996c9314 LB |
3016 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3017 | num_labels, addpath_encode, | |
3018 | addpath_tx_id, attr); | |
d62a17ae | 3019 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3020 | } |
d62a17ae | 3021 | |
3022 | /* Origin attribute. */ | |
3023 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3024 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3025 | stream_putc(s, 1); | |
3026 | stream_putc(s, attr->origin); | |
3027 | ||
3028 | /* AS path attribute. */ | |
3029 | ||
3030 | /* If remote-peer is EBGP */ | |
3031 | if (peer->sort == BGP_PEER_EBGP | |
3032 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3033 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3034 | || attr->aspath->segments == NULL) | |
3035 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3036 | PEER_FLAG_RSERVER_CLIENT))) { | |
3037 | aspath = aspath_dup(attr->aspath); | |
3038 | ||
3039 | /* Even though we may not be configured for confederations we | |
3040 | * may have | |
3041 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3042 | aspath = aspath_delete_confed_seq(aspath); | |
3043 | ||
3044 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3045 | /* Stuff our path CONFED_ID on the front */ | |
3046 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3047 | } else { | |
3048 | if (peer->change_local_as) { | |
3049 | /* If replace-as is specified, we only use the | |
3050 | change_local_as when | |
3051 | advertising routes. */ | |
3052 | if (!CHECK_FLAG( | |
3053 | peer->flags, | |
3054 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) { | |
3055 | aspath = aspath_add_seq(aspath, | |
3056 | peer->local_as); | |
3057 | } | |
3058 | aspath = aspath_add_seq(aspath, | |
3059 | peer->change_local_as); | |
3060 | } else { | |
3061 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3062 | } | |
3063 | } | |
3064 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3065 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3066 | * thing */ | |
3067 | aspath = aspath_dup(attr->aspath); | |
3068 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3069 | } else | |
3070 | aspath = attr->aspath; | |
3071 | ||
3072 | /* If peer is not AS4 capable, then: | |
3073 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3074 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3075 | * segment | |
3076 | * types are in it (i.e. exclude them if they are there) | |
3077 | * AND do this only if there is at least one asnum > 65535 in the | |
3078 | * path! | |
3079 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3080 | * change | |
3081 | * all ASnums > 65535 to BGP_AS_TRANS | |
3082 | */ | |
3083 | ||
3084 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3085 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3086 | aspath_sizep = stream_get_endp(s); | |
3087 | stream_putw(s, 0); | |
3088 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3089 | ||
3090 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3091 | * in the path | |
3092 | */ | |
3093 | if (!use32bit && aspath_has_as4(aspath)) | |
3094 | send_as4_path = | |
3095 | 1; /* we'll do this later, at the correct place */ | |
3096 | ||
3097 | /* Nexthop attribute. */ | |
3098 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3099 | && !peer_cap_enhe(peer, afi, safi)) { | |
3100 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
3101 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3102 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3103 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3104 | attr); | |
3105 | stream_putc(s, 4); | |
3106 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3107 | } else if (peer_cap_enhe(from, afi, safi)) { | |
3108 | /* | |
3109 | * Likely this is the case when an IPv4 prefix was | |
3110 | * received with | |
3111 | * Extended Next-hop capability and now being advertised | |
3112 | * to | |
3113 | * non-ENHE peers. | |
3114 | * Setting the mandatory (ipv4) next-hop attribute here | |
3115 | * to enable | |
3116 | * implicit next-hop self with correct (ipv4 address | |
3117 | * family). | |
3118 | */ | |
3119 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3120 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3121 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3122 | NULL); | |
3123 | stream_putc(s, 4); | |
3124 | stream_put_ipv4(s, 0); | |
3125 | } | |
718e3744 | 3126 | } |
d62a17ae | 3127 | |
3128 | /* MED attribute. */ | |
3129 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3130 | || bgp->maxmed_active) { | |
3131 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3132 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3133 | stream_putc(s, 4); | |
3134 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3135 | : attr->med)); | |
3136 | } | |
3137 | ||
3138 | /* Local preference. */ | |
3139 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3140 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3141 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3142 | stream_putc(s, 4); | |
3143 | stream_putl(s, attr->local_pref); | |
3144 | } | |
3145 | ||
3146 | /* Atomic aggregate. */ | |
3147 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3148 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3149 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3150 | stream_putc(s, 0); | |
3151 | } | |
3152 | ||
3153 | /* Aggregator. */ | |
3154 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3155 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3156 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3157 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3158 | ||
3159 | if (use32bit) { | |
3160 | /* AS4 capable peer */ | |
3161 | stream_putc(s, 8); | |
3162 | stream_putl(s, attr->aggregator_as); | |
3163 | } else { | |
3164 | /* 2-byte AS peer */ | |
3165 | stream_putc(s, 6); | |
3166 | ||
3167 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3168 | * used? */ | |
3169 | if (attr->aggregator_as > 65535) { | |
3170 | stream_putw(s, BGP_AS_TRANS); | |
3171 | ||
3172 | /* we have to send AS4_AGGREGATOR, too. | |
3173 | * we'll do that later in order to send | |
3174 | * attributes in ascending | |
3175 | * order. | |
3176 | */ | |
3177 | send_as4_aggregator = 1; | |
3178 | } else | |
d7c0a89a | 3179 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 3180 | } |
3181 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3182 | } | |
3183 | ||
3184 | /* Community attribute. */ | |
3185 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3186 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3187 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3188 | stream_putc(s, |
3189 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3190 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3191 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3192 | stream_putw(s, attr->community->size * 4); | |
3193 | } else { | |
996c9314 LB |
3194 | stream_putc(s, |
3195 | BGP_ATTR_FLAG_OPTIONAL | |
3196 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3197 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3198 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3199 | } |
d62a17ae | 3200 | stream_put(s, attr->community->val, attr->community->size * 4); |
3201 | } | |
3202 | ||
3203 | /* | |
3204 | * Large Community attribute. | |
3205 | */ | |
3206 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3207 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3208 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3209 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3210 | stream_putc(s, |
3211 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3212 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3213 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3214 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3215 | } else { |
996c9314 LB |
3216 | stream_putc(s, |
3217 | BGP_ATTR_FLAG_OPTIONAL | |
3218 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3219 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3220 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3221 | } |
d62a17ae | 3222 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3223 | lcom_length(attr->lcommunity)); |
d62a17ae | 3224 | } |
4372df71 | 3225 | |
d62a17ae | 3226 | /* Route Reflector. */ |
3227 | if (peer->sort == BGP_PEER_IBGP && from | |
3228 | && from->sort == BGP_PEER_IBGP) { | |
3229 | /* Originator ID. */ | |
3230 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3231 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3232 | stream_putc(s, 4); | |
3233 | ||
3234 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3235 | stream_put_in_addr(s, &attr->originator_id); | |
3236 | else | |
3237 | stream_put_in_addr(s, &from->remote_id); | |
3238 | ||
3239 | /* Cluster list. */ | |
3240 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3241 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3242 | ||
3243 | if (attr->cluster) { | |
3244 | stream_putc(s, attr->cluster->length + 4); | |
3245 | /* If this peer configuration's parent BGP has | |
3246 | * cluster_id. */ | |
3247 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3248 | stream_put_in_addr(s, &bgp->cluster_id); | |
3249 | else | |
3250 | stream_put_in_addr(s, &bgp->router_id); | |
3251 | stream_put(s, attr->cluster->list, | |
3252 | attr->cluster->length); | |
3253 | } else { | |
3254 | stream_putc(s, 4); | |
3255 | /* If this peer configuration's parent BGP has | |
3256 | * cluster_id. */ | |
3257 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3258 | stream_put_in_addr(s, &bgp->cluster_id); | |
3259 | else | |
3260 | stream_put_in_addr(s, &bgp->router_id); | |
3261 | } | |
3262 | } | |
4372df71 | 3263 | |
d62a17ae | 3264 | /* Extended Communities attribute. */ |
3265 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3266 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3267 | if (peer->sort == BGP_PEER_IBGP | |
3268 | || peer->sort == BGP_PEER_CONFED) { | |
3269 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
3270 | stream_putc(s, |
3271 | BGP_ATTR_FLAG_OPTIONAL | |
3272 | | BGP_ATTR_FLAG_TRANS | |
3273 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3274 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3275 | stream_putw(s, attr->ecommunity->size * 8); | |
3276 | } else { | |
996c9314 LB |
3277 | stream_putc(s, |
3278 | BGP_ATTR_FLAG_OPTIONAL | |
3279 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3280 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3281 | stream_putc(s, attr->ecommunity->size * 8); | |
3282 | } | |
3283 | stream_put(s, attr->ecommunity->val, | |
3284 | attr->ecommunity->size * 8); | |
3285 | } else { | |
d7c0a89a | 3286 | uint8_t *pnt; |
d62a17ae | 3287 | int tbit; |
3288 | int ecom_tr_size = 0; | |
3289 | int i; | |
3290 | ||
3291 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3292 | pnt = attr->ecommunity->val + (i * 8); | |
3293 | tbit = *pnt; | |
3294 | ||
3295 | if (CHECK_FLAG(tbit, | |
3296 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3297 | continue; | |
3298 | ||
3299 | ecom_tr_size++; | |
3300 | } | |
3301 | ||
3302 | if (ecom_tr_size) { | |
3303 | if (ecom_tr_size * 8 > 255) { | |
3304 | stream_putc( | |
3305 | s, | |
3306 | BGP_ATTR_FLAG_OPTIONAL | |
3307 | | BGP_ATTR_FLAG_TRANS | |
3308 | | BGP_ATTR_FLAG_EXTLEN); | |
3309 | stream_putc(s, | |
3310 | BGP_ATTR_EXT_COMMUNITIES); | |
3311 | stream_putw(s, ecom_tr_size * 8); | |
3312 | } else { | |
3313 | stream_putc( | |
3314 | s, | |
3315 | BGP_ATTR_FLAG_OPTIONAL | |
3316 | | BGP_ATTR_FLAG_TRANS); | |
3317 | stream_putc(s, | |
3318 | BGP_ATTR_EXT_COMMUNITIES); | |
3319 | stream_putc(s, ecom_tr_size * 8); | |
3320 | } | |
3321 | ||
3322 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3323 | pnt = attr->ecommunity->val + (i * 8); | |
3324 | tbit = *pnt; | |
3325 | ||
3326 | if (CHECK_FLAG( | |
3327 | tbit, | |
3328 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3329 | continue; | |
3330 | ||
3331 | stream_put(s, pnt, 8); | |
3332 | } | |
3333 | } | |
3334 | } | |
3335 | } | |
4372df71 | 3336 | |
d62a17ae | 3337 | /* Label index attribute. */ |
3338 | if (safi == SAFI_LABELED_UNICAST) { | |
3339 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 3340 | uint32_t label_index; |
d62a17ae | 3341 | |
3342 | label_index = attr->label_index; | |
3343 | ||
3344 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3345 | stream_putc(s, |
3346 | BGP_ATTR_FLAG_OPTIONAL | |
3347 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3348 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3349 | stream_putc(s, 10); | |
3350 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3351 | stream_putw(s, | |
3352 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3353 | stream_putc(s, 0); // reserved | |
3354 | stream_putw(s, 0); // flags | |
3355 | stream_putl(s, label_index); | |
3356 | } | |
4372df71 | 3357 | } |
d62a17ae | 3358 | } |
3359 | ||
3360 | if (send_as4_path) { | |
3361 | /* If the peer is NOT As4 capable, AND */ | |
3362 | /* there are ASnums > 65535 in path THEN | |
3363 | * give out AS4_PATH */ | |
3364 | ||
3365 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3366 | * path segments! | |
3367 | * Hm, I wonder... confederation things *should* only be at | |
3368 | * the beginning of an aspath, right? Then we should use | |
3369 | * aspath_delete_confed_seq for this, because it is already | |
3370 | * there! (JK) | |
3371 | * Folks, talk to me: what is reasonable here!? | |
3372 | */ | |
3373 | aspath = aspath_delete_confed_seq(aspath); | |
3374 | ||
996c9314 LB |
3375 | stream_putc(s, |
3376 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3377 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3378 | stream_putc(s, BGP_ATTR_AS4_PATH); |
3379 | aspath_sizep = stream_get_endp(s); | |
3380 | stream_putw(s, 0); | |
3381 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3382 | } | |
3383 | ||
3384 | if (aspath != attr->aspath) | |
3385 | aspath_free(aspath); | |
3386 | ||
3387 | if (send_as4_aggregator) { | |
3388 | /* send AS4_AGGREGATOR, at this place */ | |
3389 | /* this section of code moved here in order to ensure the | |
3390 | * correct | |
3391 | * *ascending* order of attributes | |
3392 | */ | |
3393 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3394 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3395 | stream_putc(s, 8); | |
3396 | stream_putl(s, attr->aggregator_as); | |
3397 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3398 | } | |
3399 | ||
3400 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3401 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3402 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3403 | /* Tunnel Encap attribute */ | |
3404 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3405 | |
3406 | #if ENABLE_BGP_VNC | |
d62a17ae | 3407 | /* VNC attribute */ |
3408 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 3409 | #endif |
d62a17ae | 3410 | } |
587ff0fd | 3411 | |
a21bd7a3 DW |
3412 | /* PMSI Tunnel */ |
3413 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
3414 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3415 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
3416 | stream_putc(s, 9); // Length | |
3417 | stream_putc(s, 0); // Flags | |
7fd077aa | 3418 | stream_putc(s, PMSI_TNLTYPE_INGR_REPL); // IR (6) |
996c9314 LB |
3419 | stream_put(s, &(attr->label), |
3420 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
3421 | stream_put_ipv4(s, attr->nexthop.s_addr); |
3422 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
3423 | } |
3424 | ||
d62a17ae | 3425 | /* Unknown transit attribute. */ |
3426 | if (attr->transit) | |
3427 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 3428 | |
d62a17ae | 3429 | /* Return total size of attribute. */ |
3430 | return stream_get_endp(s) - cp; | |
718e3744 | 3431 | } |
3432 | ||
d62a17ae | 3433 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 3434 | { |
d62a17ae | 3435 | unsigned long attrlen_pnt; |
3436 | iana_afi_t pkt_afi; | |
5c525538 | 3437 | iana_safi_t pkt_safi; |
718e3744 | 3438 | |
d62a17ae | 3439 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3440 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3441 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 3442 | |
d62a17ae | 3443 | attrlen_pnt = stream_get_endp(s); |
3444 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 3445 | |
d62a17ae | 3446 | /* Convert AFI, SAFI to values for packet. */ |
3447 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 3448 | |
d62a17ae | 3449 | stream_putw(s, pkt_afi); |
3450 | stream_putc(s, pkt_safi); | |
9cabb64b | 3451 | |
d62a17ae | 3452 | return attrlen_pnt; |
8c71e481 | 3453 | } |
718e3744 | 3454 | |
d62a17ae | 3455 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, |
3456 | safi_t safi, struct prefix_rd *prd, | |
d7c0a89a QY |
3457 | mpls_label_t *label, uint32_t num_labels, |
3458 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 3459 | struct attr *attr) |
8c71e481 | 3460 | { |
d7c0a89a | 3461 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 3462 | |
b57ba6d2 | 3463 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 3464 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
3465 | num_labels = 1; |
3466 | } | |
cd1964ff | 3467 | |
996c9314 | 3468 | return bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
d62a17ae | 3469 | addpath_encode, addpath_tx_id, attr); |
8c71e481 | 3470 | } |
718e3744 | 3471 | |
d62a17ae | 3472 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 3473 | { |
d62a17ae | 3474 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 3475 | } |
3476 | ||
3477 | /* Initialization of attribute. */ | |
d62a17ae | 3478 | void bgp_attr_init(void) |
718e3744 | 3479 | { |
d62a17ae | 3480 | aspath_init(); |
3481 | attrhash_init(); | |
3482 | community_init(); | |
3483 | ecommunity_init(); | |
3484 | lcommunity_init(); | |
3485 | cluster_init(); | |
3486 | transit_init(); | |
3487 | encap_init(); | |
718e3744 | 3488 | } |
3489 | ||
d62a17ae | 3490 | void bgp_attr_finish(void) |
228da428 | 3491 | { |
d62a17ae | 3492 | aspath_finish(); |
3493 | attrhash_finish(); | |
3494 | community_finish(); | |
3495 | ecommunity_finish(); | |
3496 | lcommunity_finish(); | |
3497 | cluster_finish(); | |
3498 | transit_finish(); | |
3499 | encap_finish(); | |
228da428 CC |
3500 | } |
3501 | ||
718e3744 | 3502 | /* Make attribute packet. */ |
d62a17ae | 3503 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
3504 | struct prefix *prefix) | |
3505 | { | |
3506 | unsigned long cp; | |
3507 | unsigned long len; | |
3508 | size_t aspath_lenp; | |
3509 | struct aspath *aspath; | |
3510 | int addpath_encode = 0; | |
d7c0a89a | 3511 | uint32_t addpath_tx_id = 0; |
d62a17ae | 3512 | |
3513 | /* Remember current pointer. */ | |
3514 | cp = stream_get_endp(s); | |
3515 | ||
3516 | /* Place holder of length. */ | |
3517 | stream_putw(s, 0); | |
3518 | ||
3519 | /* Origin attribute. */ | |
3520 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3521 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3522 | stream_putc(s, 1); | |
3523 | stream_putc(s, attr->origin); | |
3524 | ||
3525 | aspath = attr->aspath; | |
3526 | ||
3527 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3528 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3529 | aspath_lenp = stream_get_endp(s); | |
3530 | stream_putw(s, 0); | |
3531 | ||
3532 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3533 | ||
3534 | /* Nexthop attribute. */ | |
3535 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3536 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3537 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3538 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3539 | stream_putc(s, 4); | |
3540 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 3541 | } |
d62a17ae | 3542 | |
3543 | /* MED attribute. */ | |
3544 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3545 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3546 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3547 | stream_putc(s, 4); | |
3548 | stream_putl(s, attr->med); | |
3549 | } | |
3550 | ||
3551 | /* Local preference. */ | |
3552 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3553 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3554 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3555 | stream_putc(s, 4); | |
3556 | stream_putl(s, attr->local_pref); | |
3557 | } | |
3558 | ||
3559 | /* Atomic aggregate. */ | |
3560 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3561 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3562 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3563 | stream_putc(s, 0); | |
3564 | } | |
3565 | ||
3566 | /* Aggregator. */ | |
3567 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3568 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3569 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3570 | stream_putc(s, 8); | |
3571 | stream_putl(s, attr->aggregator_as); | |
3572 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3573 | } | |
3574 | ||
3575 | /* Community attribute. */ | |
3576 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3577 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3578 | stream_putc(s, |
3579 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3580 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3581 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3582 | stream_putw(s, attr->community->size * 4); | |
3583 | } else { | |
996c9314 LB |
3584 | stream_putc(s, |
3585 | BGP_ATTR_FLAG_OPTIONAL | |
3586 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3587 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3588 | stream_putc(s, attr->community->size * 4); | |
3589 | } | |
3590 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3591 | } | |
3592 | ||
3593 | /* Large Community attribute. */ | |
3594 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 3595 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3596 | stream_putc(s, |
3597 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3598 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3599 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3600 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3601 | } else { |
996c9314 LB |
3602 | stream_putc(s, |
3603 | BGP_ATTR_FLAG_OPTIONAL | |
3604 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3605 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3606 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3607 | } |
3608 | ||
996c9314 LB |
3609 | stream_put(s, attr->lcommunity->val, |
3610 | lcom_length(attr->lcommunity)); | |
d62a17ae | 3611 | } |
3612 | ||
3613 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3614 | if (prefix != NULL && prefix->family == AF_INET6 | |
3615 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3616 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3617 | int sizep; | |
3618 | ||
3619 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3620 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3621 | sizep = stream_get_endp(s); | |
3622 | ||
3623 | /* MP header */ | |
3624 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3625 | stream_putw(s, AFI_IP6); /* AFI */ | |
3626 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3627 | ||
3628 | /* Next hop */ | |
3629 | stream_putc(s, attr->mp_nexthop_len); | |
3630 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3631 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3632 | stream_put(s, &attr->mp_nexthop_local, | |
3633 | IPV6_MAX_BYTELEN); | |
3634 | ||
3635 | /* SNPA */ | |
3636 | stream_putc(s, 0); | |
3637 | ||
3638 | /* Prefix */ | |
3639 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3640 | addpath_tx_id); | |
3641 | ||
3642 | /* Set MP attribute length. */ | |
3643 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3644 | } | |
3645 | ||
3646 | /* Prefix SID */ | |
3647 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3648 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3649 | stream_putc(s, |
3650 | BGP_ATTR_FLAG_OPTIONAL | |
3651 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3652 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3653 | stream_putc(s, 10); | |
3654 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3655 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3656 | stream_putc(s, 0); // reserved | |
3657 | stream_putw(s, 0); // flags | |
3658 | stream_putl(s, attr->label_index); | |
3659 | } | |
3660 | } | |
3661 | ||
3662 | /* Return total size of attribute. */ | |
3663 | len = stream_get_endp(s) - cp - 2; | |
3664 | stream_putw_at(s, cp, len); | |
718e3744 | 3665 | } |