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718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
718e3744 | 35 | |
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_route.h" | |
39 | #include "bgpd/bgp_aspath.h" | |
40 | #include "bgpd/bgp_community.h" | |
41 | #include "bgpd/bgp_debug.h" | |
9bedbb1e | 42 | #include "bgpd/bgp_label.h" |
718e3744 | 43 | #include "bgpd/bgp_packet.h" |
44 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 45 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 46 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 47 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 48 | #if ENABLE_BGP_VNC |
d62a17ae | 49 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
50 | #include "bgp_encap_types.h" | |
51 | #include "bgp_vnc_types.h" | |
65efcfce | 52 | #endif |
b18825eb PG |
53 | #include "bgp_encap_types.h" |
54 | #include "bgp_evpn.h" | |
7c40bf39 | 55 | #include "bgp_flowspec_private.h" |
6b0655a2 | 56 | |
718e3744 | 57 | /* Attribute strings for logging. */ |
d62a17ae | 58 | static const struct message attr_str[] = { |
59 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
60 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
61 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
62 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
63 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
64 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
65 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
66 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
67 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
68 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
69 | {BGP_ATTR_DPA, "DPA"}, | |
70 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
71 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
72 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
73 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
74 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
75 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
76 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
77 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 78 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 79 | {BGP_ATTR_ENCAP, "ENCAP"}, |
65efcfce | 80 | #if ENABLE_BGP_VNC |
d62a17ae | 81 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 82 | #endif |
d62a17ae | 83 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
84 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
85 | {0}}; | |
afcb7679 | 86 | |
996c9314 LB |
87 | static const struct message attr_flag_str[] = { |
88 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
89 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
90 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
91 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
92 | this list */ | |
93 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
94 | {0}}; | |
6b0655a2 | 95 | |
9bddac4b | 96 | static struct hash *cluster_hash; |
718e3744 | 97 | |
d62a17ae | 98 | static void *cluster_hash_alloc(void *p) |
718e3744 | 99 | { |
d62a17ae | 100 | const struct cluster_list *val = (const struct cluster_list *)p; |
101 | struct cluster_list *cluster; | |
718e3744 | 102 | |
d62a17ae | 103 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
104 | cluster->length = val->length; | |
718e3744 | 105 | |
d62a17ae | 106 | if (cluster->length) { |
107 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
108 | memcpy(cluster->list, val->list, val->length); | |
109 | } else | |
110 | cluster->list = NULL; | |
718e3744 | 111 | |
d62a17ae | 112 | cluster->refcnt = 0; |
718e3744 | 113 | |
d62a17ae | 114 | return cluster; |
718e3744 | 115 | } |
116 | ||
117 | /* Cluster list related functions. */ | |
d62a17ae | 118 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 119 | { |
d62a17ae | 120 | struct cluster_list tmp; |
121 | struct cluster_list *cluster; | |
718e3744 | 122 | |
d62a17ae | 123 | tmp.length = length; |
124 | tmp.list = pnt; | |
718e3744 | 125 | |
d62a17ae | 126 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
127 | cluster->refcnt++; | |
128 | return cluster; | |
718e3744 | 129 | } |
130 | ||
d62a17ae | 131 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 132 | { |
d62a17ae | 133 | int i; |
134 | ||
135 | for (i = 0; i < cluster->length / 4; i++) | |
136 | if (cluster->list[i].s_addr == originator.s_addr) | |
137 | return 1; | |
138 | return 0; | |
718e3744 | 139 | } |
140 | ||
d62a17ae | 141 | static unsigned int cluster_hash_key_make(void *p) |
718e3744 | 142 | { |
d62a17ae | 143 | const struct cluster_list *cluster = p; |
718e3744 | 144 | |
d62a17ae | 145 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 146 | } |
147 | ||
d62a17ae | 148 | static int cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 149 | { |
d62a17ae | 150 | const struct cluster_list *cluster1 = p1; |
151 | const struct cluster_list *cluster2 = p2; | |
923de654 | 152 | |
d62a17ae | 153 | return (cluster1->length == cluster2->length |
154 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
155 | == 0); | |
718e3744 | 156 | } |
157 | ||
d62a17ae | 158 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 159 | { |
d62a17ae | 160 | if (cluster->list) |
161 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); | |
162 | XFREE(MTYPE_CLUSTER, cluster); | |
718e3744 | 163 | } |
164 | ||
d62a17ae | 165 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 166 | { |
d62a17ae | 167 | struct cluster_list *find; |
718e3744 | 168 | |
d62a17ae | 169 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
170 | find->refcnt++; | |
718e3744 | 171 | |
d62a17ae | 172 | return find; |
718e3744 | 173 | } |
174 | ||
d62a17ae | 175 | void cluster_unintern(struct cluster_list *cluster) |
718e3744 | 176 | { |
d62a17ae | 177 | if (cluster->refcnt) |
178 | cluster->refcnt--; | |
718e3744 | 179 | |
d62a17ae | 180 | if (cluster->refcnt == 0) { |
181 | hash_release(cluster_hash, cluster); | |
182 | cluster_free(cluster); | |
183 | } | |
718e3744 | 184 | } |
185 | ||
d62a17ae | 186 | static void cluster_init(void) |
718e3744 | 187 | { |
996c9314 | 188 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 189 | "BGP Cluster"); |
718e3744 | 190 | } |
228da428 | 191 | |
d62a17ae | 192 | static void cluster_finish(void) |
228da428 | 193 | { |
d62a17ae | 194 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
195 | hash_free(cluster_hash); | |
196 | cluster_hash = NULL; | |
228da428 | 197 | } |
6b0655a2 | 198 | |
bede7744 LB |
199 | static struct hash *encap_hash = NULL; |
200 | #if ENABLE_BGP_VNC | |
201 | static struct hash *vnc_hash = NULL; | |
202 | #endif | |
203 | ||
d62a17ae | 204 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 205 | { |
d62a17ae | 206 | struct bgp_attr_encap_subtlv *new; |
207 | struct bgp_attr_encap_subtlv *tail; | |
208 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 209 | |
d62a17ae | 210 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 211 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 212 | if (tail) { |
213 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
214 | tail = tail->next; | |
215 | } else { | |
216 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
217 | } | |
218 | assert(tail); | |
219 | memcpy(tail, p, size); | |
220 | tail->next = NULL; | |
f4c89855 | 221 | } |
f4c89855 | 222 | |
d62a17ae | 223 | return new; |
f4c89855 LB |
224 | } |
225 | ||
d62a17ae | 226 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 227 | { |
d62a17ae | 228 | struct bgp_attr_encap_subtlv *next; |
229 | while (p) { | |
230 | next = p->next; | |
231 | p->next = NULL; | |
232 | XFREE(MTYPE_ENCAP_TLV, p); | |
233 | p = next; | |
234 | } | |
f4c89855 LB |
235 | } |
236 | ||
d62a17ae | 237 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 238 | { |
d62a17ae | 239 | if (!attr) |
240 | return; | |
f4c89855 | 241 | |
d62a17ae | 242 | if (attr->encap_subtlvs) { |
243 | encap_free(attr->encap_subtlvs); | |
244 | attr->encap_subtlvs = NULL; | |
245 | } | |
65efcfce | 246 | #if ENABLE_BGP_VNC |
d62a17ae | 247 | if (attr->vnc_subtlvs) { |
248 | encap_free(attr->vnc_subtlvs); | |
249 | attr->vnc_subtlvs = NULL; | |
250 | } | |
65efcfce | 251 | #endif |
f4c89855 LB |
252 | } |
253 | ||
254 | /* | |
255 | * Compare encap sub-tlv chains | |
256 | * | |
257 | * 1 = equivalent | |
258 | * 0 = not equivalent | |
259 | * | |
260 | * This algorithm could be made faster if needed | |
261 | */ | |
d62a17ae | 262 | static int encap_same(struct bgp_attr_encap_subtlv *h1, |
263 | struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 264 | { |
d62a17ae | 265 | struct bgp_attr_encap_subtlv *p; |
266 | struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 267 | |
d62a17ae | 268 | if (h1 == h2) |
269 | return 1; | |
270 | if (h1 == NULL || h2 == NULL) | |
271 | return 0; | |
f4c89855 | 272 | |
d62a17ae | 273 | for (p = h1; p; p = p->next) { |
274 | for (q = h2; q; q = q->next) { | |
275 | if ((p->type == q->type) && (p->length == q->length) | |
276 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 277 | |
d62a17ae | 278 | break; |
279 | } | |
280 | } | |
281 | if (!q) | |
282 | return 0; | |
f4c89855 | 283 | } |
f4c89855 | 284 | |
d62a17ae | 285 | for (p = h2; p; p = p->next) { |
286 | for (q = h1; q; q = q->next) { | |
287 | if ((p->type == q->type) && (p->length == q->length) | |
288 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 289 | |
d62a17ae | 290 | break; |
291 | } | |
292 | } | |
293 | if (!q) | |
294 | return 0; | |
f4c89855 | 295 | } |
f4c89855 | 296 | |
d62a17ae | 297 | return 1; |
f4c89855 LB |
298 | } |
299 | ||
d62a17ae | 300 | static void *encap_hash_alloc(void *p) |
bede7744 | 301 | { |
d62a17ae | 302 | /* Encap structure is already allocated. */ |
303 | return p; | |
bede7744 LB |
304 | } |
305 | ||
d62a17ae | 306 | typedef enum { |
307 | ENCAP_SUBTLV_TYPE, | |
bede7744 | 308 | #if ENABLE_BGP_VNC |
d62a17ae | 309 | VNC_SUBTLV_TYPE |
bede7744 LB |
310 | #endif |
311 | } encap_subtlv_type; | |
312 | ||
313 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 314 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 315 | { |
d62a17ae | 316 | struct bgp_attr_encap_subtlv *find; |
317 | struct hash *hash = encap_hash; | |
bede7744 | 318 | #if ENABLE_BGP_VNC |
d62a17ae | 319 | if (type == VNC_SUBTLV_TYPE) |
320 | hash = vnc_hash; | |
bede7744 LB |
321 | #endif |
322 | ||
d62a17ae | 323 | find = hash_get(hash, encap, encap_hash_alloc); |
324 | if (find != encap) | |
325 | encap_free(encap); | |
326 | find->refcnt++; | |
bede7744 | 327 | |
d62a17ae | 328 | return find; |
bede7744 LB |
329 | } |
330 | ||
d62a17ae | 331 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
332 | encap_subtlv_type type) | |
bede7744 | 333 | { |
d62a17ae | 334 | struct bgp_attr_encap_subtlv *encap = *encapp; |
335 | if (encap->refcnt) | |
336 | encap->refcnt--; | |
bede7744 | 337 | |
d62a17ae | 338 | if (encap->refcnt == 0) { |
339 | struct hash *hash = encap_hash; | |
bede7744 | 340 | #if ENABLE_BGP_VNC |
d62a17ae | 341 | if (type == VNC_SUBTLV_TYPE) |
342 | hash = vnc_hash; | |
bede7744 | 343 | #endif |
d62a17ae | 344 | hash_release(hash, encap); |
345 | encap_free(encap); | |
346 | *encapp = NULL; | |
347 | } | |
bede7744 LB |
348 | } |
349 | ||
d62a17ae | 350 | static unsigned int encap_hash_key_make(void *p) |
bede7744 | 351 | { |
d62a17ae | 352 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 353 | |
d62a17ae | 354 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
355 | } |
356 | ||
d62a17ae | 357 | static int encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 358 | { |
d62a17ae | 359 | return encap_same((struct bgp_attr_encap_subtlv *)p1, |
360 | (struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
361 | } |
362 | ||
d62a17ae | 363 | static void encap_init(void) |
bede7744 | 364 | { |
996c9314 | 365 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 366 | "BGP Encap Hash"); |
bede7744 | 367 | #if ENABLE_BGP_VNC |
996c9314 | 368 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 369 | "BGP VNC Hash"); |
bede7744 LB |
370 | #endif |
371 | } | |
372 | ||
d62a17ae | 373 | static void encap_finish(void) |
bede7744 | 374 | { |
d62a17ae | 375 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
376 | hash_free(encap_hash); | |
377 | encap_hash = NULL; | |
bede7744 | 378 | #if ENABLE_BGP_VNC |
d62a17ae | 379 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
380 | hash_free(vnc_hash); | |
381 | vnc_hash = NULL; | |
bede7744 LB |
382 | #endif |
383 | } | |
384 | ||
d62a17ae | 385 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 386 | { |
d62a17ae | 387 | if (!a1 && a2) |
388 | return false; | |
389 | if (!a2 && a1) | |
390 | return false; | |
391 | if (!a1 && !a2) | |
392 | return true; | |
393 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
394 | sizeof(struct overlay_index)); | |
684a7227 PG |
395 | } |
396 | ||
718e3744 | 397 | /* Unknown transit attribute. */ |
9bddac4b | 398 | static struct hash *transit_hash; |
718e3744 | 399 | |
d62a17ae | 400 | static void transit_free(struct transit *transit) |
718e3744 | 401 | { |
d62a17ae | 402 | if (transit->val) |
403 | XFREE(MTYPE_TRANSIT_VAL, transit->val); | |
404 | XFREE(MTYPE_TRANSIT, transit); | |
718e3744 | 405 | } |
406 | ||
d62a17ae | 407 | static void *transit_hash_alloc(void *p) |
718e3744 | 408 | { |
d62a17ae | 409 | /* Transit structure is already allocated. */ |
410 | return p; | |
718e3744 | 411 | } |
412 | ||
d62a17ae | 413 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 414 | { |
d62a17ae | 415 | struct transit *find; |
718e3744 | 416 | |
d62a17ae | 417 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
418 | if (find != transit) | |
419 | transit_free(transit); | |
420 | find->refcnt++; | |
718e3744 | 421 | |
d62a17ae | 422 | return find; |
718e3744 | 423 | } |
424 | ||
d62a17ae | 425 | void transit_unintern(struct transit *transit) |
718e3744 | 426 | { |
d62a17ae | 427 | if (transit->refcnt) |
428 | transit->refcnt--; | |
718e3744 | 429 | |
d62a17ae | 430 | if (transit->refcnt == 0) { |
431 | hash_release(transit_hash, transit); | |
432 | transit_free(transit); | |
433 | } | |
718e3744 | 434 | } |
435 | ||
d62a17ae | 436 | static unsigned int transit_hash_key_make(void *p) |
718e3744 | 437 | { |
d62a17ae | 438 | const struct transit *transit = p; |
718e3744 | 439 | |
d62a17ae | 440 | return jhash(transit->val, transit->length, 0); |
718e3744 | 441 | } |
442 | ||
d62a17ae | 443 | static int transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 444 | { |
d62a17ae | 445 | const struct transit *transit1 = p1; |
446 | const struct transit *transit2 = p2; | |
923de654 | 447 | |
d62a17ae | 448 | return (transit1->length == transit2->length |
449 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 450 | } |
451 | ||
d62a17ae | 452 | static void transit_init(void) |
718e3744 | 453 | { |
996c9314 | 454 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 455 | "BGP Transit Hash"); |
718e3744 | 456 | } |
228da428 | 457 | |
d62a17ae | 458 | static void transit_finish(void) |
228da428 | 459 | { |
d62a17ae | 460 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
461 | hash_free(transit_hash); | |
462 | transit_hash = NULL; | |
228da428 | 463 | } |
6b0655a2 | 464 | |
718e3744 | 465 | /* Attribute hash routines. */ |
9bddac4b | 466 | static struct hash *attrhash; |
718e3744 | 467 | |
fb982c25 PJ |
468 | /* Shallow copy of an attribute |
469 | * Though, not so shallow that it doesn't copy the contents | |
470 | * of the attr_extra pointed to by 'extra' | |
471 | */ | |
d62a17ae | 472 | void bgp_attr_dup(struct attr *new, struct attr *orig) |
fb982c25 | 473 | { |
d62a17ae | 474 | *new = *orig; |
fb982c25 PJ |
475 | } |
476 | ||
d62a17ae | 477 | unsigned long int attr_count(void) |
cbdfbaa5 | 478 | { |
d62a17ae | 479 | return attrhash->count; |
cbdfbaa5 PJ |
480 | } |
481 | ||
d62a17ae | 482 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 483 | { |
d62a17ae | 484 | return transit_hash->count; |
cbdfbaa5 PJ |
485 | } |
486 | ||
d62a17ae | 487 | unsigned int attrhash_key_make(void *p) |
718e3744 | 488 | { |
d62a17ae | 489 | const struct attr *attr = (struct attr *)p; |
490 | uint32_t key = 0; | |
c8e7b895 | 491 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 492 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 493 | |
0d0268a6 | 494 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
495 | MIX3(attr->local_pref, attr->aggregator_as, |
496 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
497 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
498 | attr->originator_id.s_addr); | |
499 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 500 | |
501 | if (attr->aspath) | |
502 | MIX(aspath_key_make(attr->aspath)); | |
503 | if (attr->community) | |
504 | MIX(community_hash_make(attr->community)); | |
505 | ||
506 | if (attr->lcommunity) | |
507 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
508 | if (attr->ecommunity) | |
509 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
510 | if (attr->cluster) | |
511 | MIX(cluster_hash_key_make(attr->cluster)); | |
512 | if (attr->transit) | |
513 | MIX(transit_hash_key_make(attr->transit)); | |
514 | if (attr->encap_subtlvs) | |
515 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
bede7744 | 516 | #if ENABLE_BGP_VNC |
d62a17ae | 517 | if (attr->vnc_subtlvs) |
518 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 519 | #endif |
d62a17ae | 520 | MIX(attr->mp_nexthop_len); |
521 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
522 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
77e62f2b | 523 | MIX(attr->nh_ifindex); |
524 | MIX(attr->nh_lla_ifindex); | |
d62a17ae | 525 | |
526 | return key; | |
527 | } | |
528 | ||
529 | int attrhash_cmp(const void *p1, const void *p2) | |
530 | { | |
531 | const struct attr *attr1 = p1; | |
532 | const struct attr *attr2 = p2; | |
533 | ||
534 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
535 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
536 | && attr1->aspath == attr2->aspath | |
537 | && attr1->community == attr2->community && attr1->med == attr2->med | |
538 | && attr1->local_pref == attr2->local_pref | |
539 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
540 | if (attr1->aggregator_as == attr2->aggregator_as | |
541 | && attr1->aggregator_addr.s_addr | |
542 | == attr2->aggregator_addr.s_addr | |
543 | && attr1->weight == attr2->weight | |
544 | && attr1->tag == attr2->tag | |
545 | && attr1->label_index == attr2->label_index | |
546 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 547 | && attr1->ecommunity == attr2->ecommunity |
548 | && attr1->lcommunity == attr2->lcommunity | |
549 | && attr1->cluster == attr2->cluster | |
550 | && attr1->transit == attr2->transit | |
551 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
552 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
65efcfce | 553 | #if ENABLE_BGP_VNC |
d62a17ae | 554 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 555 | #endif |
0d0268a6 LB |
556 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
557 | &attr2->mp_nexthop_global) | |
558 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
559 | &attr2->mp_nexthop_local) | |
560 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
561 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 562 | && IPV4_ADDR_SAME(&attr1->originator_id, |
563 | &attr2->originator_id) | |
77e62f2b | 564 | && overlay_index_same(attr1, attr2) |
565 | && attr1->nh_ifindex == attr2->nh_ifindex | |
566 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex) | |
d62a17ae | 567 | return 1; |
568 | } | |
aadc0905 | 569 | |
d62a17ae | 570 | return 0; |
718e3744 | 571 | } |
572 | ||
d62a17ae | 573 | static void attrhash_init(void) |
718e3744 | 574 | { |
996c9314 LB |
575 | attrhash = |
576 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 577 | } |
578 | ||
289d2501 LB |
579 | /* |
580 | * special for hash_clean below | |
581 | */ | |
d62a17ae | 582 | static void attr_vfree(void *attr) |
289d2501 | 583 | { |
d62a17ae | 584 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
585 | } |
586 | ||
d62a17ae | 587 | static void attrhash_finish(void) |
228da428 | 588 | { |
d62a17ae | 589 | hash_clean(attrhash, attr_vfree); |
590 | hash_free(attrhash); | |
591 | attrhash = NULL; | |
228da428 CC |
592 | } |
593 | ||
d62a17ae | 594 | static void attr_show_all_iterator(struct hash_backet *backet, struct vty *vty) |
718e3744 | 595 | { |
d62a17ae | 596 | struct attr *attr = backet->data; |
718e3744 | 597 | |
d62a17ae | 598 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
599 | inet_ntoa(attr->nexthop)); | |
13b7e7f0 | 600 | vty_out(vty, "\tflags: %" PRIu64 " med: %u local_pref: %u origin: %u weight: %u label: %u\n", |
23a2a47e | 601 | attr->flag, attr->med, attr->local_pref, attr->origin, |
13b7e7f0 | 602 | attr->weight, attr->label); |
718e3744 | 603 | } |
604 | ||
d62a17ae | 605 | void attr_show_all(struct vty *vty) |
718e3744 | 606 | { |
9d303b37 DL |
607 | hash_iterate(attrhash, (void (*)(struct hash_backet *, |
608 | void *))attr_show_all_iterator, | |
609 | vty); | |
718e3744 | 610 | } |
611 | ||
d62a17ae | 612 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 613 | { |
d62a17ae | 614 | struct attr *val = (struct attr *)p; |
615 | struct attr *attr; | |
718e3744 | 616 | |
d62a17ae | 617 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
618 | *attr = *val; | |
619 | if (val->encap_subtlvs) { | |
620 | val->encap_subtlvs = NULL; | |
621 | } | |
65efcfce | 622 | #if ENABLE_BGP_VNC |
d62a17ae | 623 | if (val->vnc_subtlvs) { |
624 | val->vnc_subtlvs = NULL; | |
625 | } | |
65efcfce | 626 | #endif |
d62a17ae | 627 | attr->refcnt = 0; |
628 | return attr; | |
718e3744 | 629 | } |
630 | ||
631 | /* Internet argument attribute. */ | |
d62a17ae | 632 | struct attr *bgp_attr_intern(struct attr *attr) |
633 | { | |
634 | struct attr *find; | |
635 | ||
636 | /* Intern referenced strucutre. */ | |
637 | if (attr->aspath) { | |
638 | if (!attr->aspath->refcnt) | |
639 | attr->aspath = aspath_intern(attr->aspath); | |
640 | else | |
641 | attr->aspath->refcnt++; | |
642 | } | |
643 | if (attr->community) { | |
644 | if (!attr->community->refcnt) | |
645 | attr->community = community_intern(attr->community); | |
646 | else | |
647 | attr->community->refcnt++; | |
648 | } | |
649 | ||
650 | if (attr->ecommunity) { | |
651 | if (!attr->ecommunity->refcnt) | |
652 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
653 | else | |
654 | attr->ecommunity->refcnt++; | |
655 | } | |
656 | if (attr->lcommunity) { | |
657 | if (!attr->lcommunity->refcnt) | |
658 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
659 | else | |
660 | attr->lcommunity->refcnt++; | |
661 | } | |
662 | if (attr->cluster) { | |
663 | if (!attr->cluster->refcnt) | |
664 | attr->cluster = cluster_intern(attr->cluster); | |
665 | else | |
666 | attr->cluster->refcnt++; | |
667 | } | |
668 | if (attr->transit) { | |
669 | if (!attr->transit->refcnt) | |
670 | attr->transit = transit_intern(attr->transit); | |
671 | else | |
672 | attr->transit->refcnt++; | |
673 | } | |
674 | if (attr->encap_subtlvs) { | |
675 | if (!attr->encap_subtlvs->refcnt) | |
676 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
677 | ENCAP_SUBTLV_TYPE); | |
678 | else | |
679 | attr->encap_subtlvs->refcnt++; | |
680 | } | |
bede7744 | 681 | #if ENABLE_BGP_VNC |
d62a17ae | 682 | if (attr->vnc_subtlvs) { |
683 | if (!attr->vnc_subtlvs->refcnt) | |
684 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
685 | VNC_SUBTLV_TYPE); | |
686 | else | |
687 | attr->vnc_subtlvs->refcnt++; | |
688 | } | |
aadc0905 | 689 | #endif |
bede7744 | 690 | |
dbbac180 DL |
691 | /* At this point, attr only contains intern'd pointers. that means |
692 | * if we find it in attrhash, it has all the same pointers and we | |
693 | * correctly updated the refcounts on these. | |
694 | * If we don't find it, we need to allocate a one because in all | |
695 | * cases this returns a new reference to a hashed attr, but the input | |
696 | * wasn't on hash. */ | |
d62a17ae | 697 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
698 | find->refcnt++; | |
699 | ||
700 | return find; | |
718e3744 | 701 | } |
702 | ||
703 | /* Make network statement's attribute. */ | |
d7c0a89a | 704 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 705 | { |
d62a17ae | 706 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 707 | |
d62a17ae | 708 | attr->origin = origin; |
709 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
710 | attr->aspath = aspath_empty(); | |
711 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
712 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
713 | attr->tag = 0; | |
714 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
715 | attr->label = MPLS_INVALID_LABEL; | |
716 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
717 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
718 | ||
719 | return attr; | |
718e3744 | 720 | } |
721 | ||
b5d58c32 | 722 | /* Create the attributes for an aggregate */ |
d7c0a89a | 723 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, uint8_t origin, |
d62a17ae | 724 | struct aspath *aspath, |
725 | struct community *community, int as_set, | |
d7c0a89a | 726 | uint8_t atomic_aggregate) |
d62a17ae | 727 | { |
728 | struct attr attr; | |
729 | struct attr *new; | |
730 | ||
731 | memset(&attr, 0, sizeof(struct attr)); | |
732 | ||
733 | /* Origin attribute. */ | |
734 | attr.origin = origin; | |
735 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
736 | ||
737 | /* AS path attribute. */ | |
738 | if (aspath) | |
739 | attr.aspath = aspath_intern(aspath); | |
740 | else | |
741 | attr.aspath = aspath_empty(); | |
742 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
743 | ||
744 | /* Next hop attribute. */ | |
745 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
746 | ||
747 | if (community) { | |
d7c0a89a | 748 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
749 | |
750 | /* If we are not shutting down ourselves and we are | |
751 | * aggregating a route that contains the GSHUT community we | |
752 | * need to remove that community when creating the aggregate */ | |
996c9314 LB |
753 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) |
754 | && community_include(community, gshut)) { | |
7f323236 DW |
755 | community_del_val(community, &gshut); |
756 | } | |
757 | ||
d62a17ae | 758 | attr.community = community; |
759 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
760 | } | |
761 | ||
7f323236 DW |
762 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { |
763 | bgp_attr_add_gshut_community(&attr); | |
764 | } | |
765 | ||
d62a17ae | 766 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
767 | attr.label = MPLS_INVALID_LABEL; | |
768 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
769 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
770 | if (!as_set || atomic_aggregate) | |
771 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
772 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
773 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
774 | attr.aggregator_as = bgp->confed_id; | |
775 | else | |
776 | attr.aggregator_as = bgp->as; | |
777 | attr.aggregator_addr = bgp->router_id; | |
778 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
779 | attr.label = MPLS_INVALID_LABEL; | |
780 | ||
781 | new = bgp_attr_intern(&attr); | |
782 | ||
783 | aspath_unintern(&new->aspath); | |
784 | return new; | |
718e3744 | 785 | } |
786 | ||
b881c707 | 787 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 788 | void bgp_attr_unintern_sub(struct attr *attr) |
789 | { | |
790 | /* aspath refcount shoud be decrement. */ | |
791 | if (attr->aspath) | |
792 | aspath_unintern(&attr->aspath); | |
793 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
794 | ||
795 | if (attr->community) | |
796 | community_unintern(&attr->community); | |
797 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
798 | ||
799 | if (attr->ecommunity) | |
800 | ecommunity_unintern(&attr->ecommunity); | |
801 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
802 | ||
803 | if (attr->lcommunity) | |
804 | lcommunity_unintern(&attr->lcommunity); | |
805 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
806 | ||
807 | if (attr->cluster) | |
808 | cluster_unintern(attr->cluster); | |
809 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
810 | ||
811 | if (attr->transit) | |
812 | transit_unintern(attr->transit); | |
813 | ||
814 | if (attr->encap_subtlvs) | |
815 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
816 | |
817 | #if ENABLE_BGP_VNC | |
d62a17ae | 818 | if (attr->vnc_subtlvs) |
819 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 820 | #endif |
b881c707 PJ |
821 | } |
822 | ||
f46d8e1e DS |
823 | /* |
824 | * We have some show commands that let you experimentally | |
825 | * apply a route-map. When we apply the route-map | |
826 | * we are reseting values but not saving them for | |
827 | * posterity via intern'ing( because route-maps don't | |
828 | * do that) but at this point in time we need | |
829 | * to compare the new attr to the old and if the | |
830 | * routemap has changed it we need to, as Snoop Dog says, | |
831 | * Drop it like it's hot | |
832 | */ | |
833 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
834 | { | |
835 | if (new->aspath != old->aspath) | |
836 | aspath_free(new->aspath); | |
837 | ||
838 | if (new->community != old->community) | |
839 | community_free(new->community); | |
840 | ||
841 | if (new->ecommunity != old->ecommunity) | |
842 | ecommunity_free(&new->ecommunity); | |
843 | ||
844 | if (new->lcommunity != old->lcommunity) | |
845 | lcommunity_free(&new->lcommunity); | |
f46d8e1e DS |
846 | } |
847 | ||
718e3744 | 848 | /* Free bgp attribute and aspath. */ |
d62a17ae | 849 | void bgp_attr_unintern(struct attr **pattr) |
850 | { | |
851 | struct attr *attr = *pattr; | |
852 | struct attr *ret; | |
853 | struct attr tmp; | |
854 | ||
855 | /* Decrement attribute reference. */ | |
856 | attr->refcnt--; | |
857 | ||
858 | tmp = *attr; | |
859 | ||
860 | /* If reference becomes zero then free attribute object. */ | |
861 | if (attr->refcnt == 0) { | |
862 | ret = hash_release(attrhash, attr); | |
863 | assert(ret != NULL); | |
864 | XFREE(MTYPE_ATTR, attr); | |
865 | *pattr = NULL; | |
866 | } | |
867 | ||
868 | bgp_attr_unintern_sub(&tmp); | |
869 | } | |
870 | ||
871 | void bgp_attr_flush(struct attr *attr) | |
872 | { | |
873 | if (attr->aspath && !attr->aspath->refcnt) { | |
874 | aspath_free(attr->aspath); | |
875 | attr->aspath = NULL; | |
876 | } | |
877 | if (attr->community && !attr->community->refcnt) { | |
878 | community_free(attr->community); | |
879 | attr->community = NULL; | |
880 | } | |
881 | ||
882 | if (attr->ecommunity && !attr->ecommunity->refcnt) | |
883 | ecommunity_free(&attr->ecommunity); | |
884 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
885 | lcommunity_free(&attr->lcommunity); | |
886 | if (attr->cluster && !attr->cluster->refcnt) { | |
887 | cluster_free(attr->cluster); | |
888 | attr->cluster = NULL; | |
889 | } | |
890 | if (attr->transit && !attr->transit->refcnt) { | |
891 | transit_free(attr->transit); | |
892 | attr->transit = NULL; | |
893 | } | |
894 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
895 | encap_free(attr->encap_subtlvs); | |
896 | attr->encap_subtlvs = NULL; | |
897 | } | |
65efcfce | 898 | #if ENABLE_BGP_VNC |
d62a17ae | 899 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
900 | encap_free(attr->vnc_subtlvs); | |
901 | attr->vnc_subtlvs = NULL; | |
902 | } | |
aadc0905 | 903 | #endif |
718e3744 | 904 | } |
905 | ||
b881c707 PJ |
906 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
907 | * avoid resetting sessions for malformed attributes which are | |
908 | * are partial/optional and hence where the error likely was not | |
909 | * introduced by the sending neighbour. | |
910 | */ | |
911 | static bgp_attr_parse_ret_t | |
d7c0a89a | 912 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 913 | bgp_size_t length) |
914 | { | |
915 | struct peer *const peer = args->peer; | |
d7c0a89a | 916 | const uint8_t flags = args->flags; |
d62a17ae | 917 | /* startp and length must be special-cased, as whether or not to |
918 | * send the attribute data with the NOTIFY depends on the error, | |
919 | * the caller therefore signals this with the seperate length argument | |
920 | */ | |
d7c0a89a | 921 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 922 | |
923 | /* Only relax error handling for eBGP peers */ | |
924 | if (peer->sort != BGP_PEER_EBGP) { | |
925 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
926 | notify_datap, length); | |
927 | return BGP_ATTR_PARSE_ERROR; | |
928 | } | |
929 | ||
930 | /* Adjust the stream getp to the end of the attribute, in case we can | |
931 | * still proceed but the caller hasn't read all the attribute. | |
932 | */ | |
933 | stream_set_getp(BGP_INPUT(peer), | |
934 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
935 | + args->total); | |
936 | ||
937 | switch (args->type) { | |
938 | /* where an attribute is relatively inconsequential, e.g. it does not | |
939 | * affect route selection, and can be safely ignored, then any such | |
940 | * attributes which are malformed should just be ignored and the route | |
941 | * processed as normal. | |
942 | */ | |
943 | case BGP_ATTR_AS4_AGGREGATOR: | |
944 | case BGP_ATTR_AGGREGATOR: | |
945 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
946 | return BGP_ATTR_PARSE_PROCEED; | |
947 | ||
948 | /* Core attributes, particularly ones which may influence route | |
949 | * selection, should always cause session resets | |
950 | */ | |
951 | case BGP_ATTR_ORIGIN: | |
952 | case BGP_ATTR_AS_PATH: | |
953 | case BGP_ATTR_NEXT_HOP: | |
954 | case BGP_ATTR_MULTI_EXIT_DISC: | |
955 | case BGP_ATTR_LOCAL_PREF: | |
956 | case BGP_ATTR_COMMUNITIES: | |
957 | case BGP_ATTR_ORIGINATOR_ID: | |
958 | case BGP_ATTR_CLUSTER_LIST: | |
959 | case BGP_ATTR_MP_REACH_NLRI: | |
960 | case BGP_ATTR_MP_UNREACH_NLRI: | |
961 | case BGP_ATTR_EXT_COMMUNITIES: | |
962 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
963 | notify_datap, length); | |
964 | return BGP_ATTR_PARSE_ERROR; | |
965 | } | |
966 | ||
967 | /* Partial optional attributes that are malformed should not cause | |
968 | * the whole session to be reset. Instead treat it as a withdrawal | |
969 | * of the routes, if possible. | |
970 | */ | |
971 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
972 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
973 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
974 | return BGP_ATTR_PARSE_WITHDRAW; | |
975 | ||
976 | /* default to reset */ | |
977 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
978 | } |
979 | ||
afcb7679 DO |
980 | /* Find out what is wrong with the path attribute flag bits and log the error. |
981 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
982 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
983 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
984 | non-transitive" attribute. */ | |
985 | static void | |
d62a17ae | 986 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
987 | uint8_t desired_flags /* how RFC says it must be */ |
988 | ) | |
d62a17ae | 989 | { |
d7c0a89a QY |
990 | uint8_t seen = 0, i; |
991 | uint8_t real_flags = args->flags; | |
992 | const uint8_t attr_code = args->type; | |
d62a17ae | 993 | |
994 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
995 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
996 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
997 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
998 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
999 | zlog_err("%s attribute must%s be flagged as \"%s\"", | |
1000 | lookup_msg(attr_str, attr_code, NULL), | |
1001 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1002 | ? "" | |
1003 | : " not", | |
1004 | attr_flag_str[i].str); | |
1005 | seen = 1; | |
1006 | } | |
1007 | if (!seen) { | |
1008 | zlog_debug( | |
1009 | "Strange, %s called for attr %s, but no problem found with flags" | |
1010 | " (real flags 0x%x, desired 0x%x)", | |
1011 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
1012 | real_flags, desired_flags); | |
1013 | } | |
afcb7679 DO |
1014 | } |
1015 | ||
3ecab4c8 PJ |
1016 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1017 | * as will PARTIAL for optional+transitive attributes. | |
1018 | */ | |
d7c0a89a QY |
1019 | const uint8_t attr_flags_values[] = { |
1020 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1021 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1022 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1023 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1024 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1025 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1026 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1027 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1028 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1029 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1030 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1031 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1032 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1033 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1034 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1035 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1036 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1037 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1038 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1039 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1040 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1041 | }; |
099111ef | 1042 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1043 | |
d62a17ae | 1044 | static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
1045 | { | |
d7c0a89a QY |
1046 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1047 | const uint8_t flags = args->flags; | |
1048 | const uint8_t attr_code = args->type; | |
d62a17ae | 1049 | |
1050 | /* there may be attributes we don't know about */ | |
1051 | if (attr_code > attr_flags_values_max) | |
1052 | return 0; | |
1053 | if (attr_flags_values[attr_code] == 0) | |
1054 | return 0; | |
1055 | ||
1056 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1057 | * to | |
1058 | * 1." | |
1059 | */ | |
1060 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1061 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
1062 | zlog_err( | |
1063 | "%s well-known attributes must have transitive flag set (%x)", | |
1064 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1065 | return 1; | |
1066 | } | |
1067 | ||
1068 | /* "For well-known attributes and for optional non-transitive | |
1069 | * attributes, | |
1070 | * the Partial bit MUST be set to 0." | |
1071 | */ | |
1072 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1073 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
1074 | zlog_err( | |
1075 | "%s well-known attribute " | |
1076 | "must NOT have the partial flag set (%x)", | |
1077 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1078 | return 1; | |
1079 | } | |
1080 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1081 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
1082 | zlog_err( | |
1083 | "%s optional + transitive attribute " | |
1084 | "must NOT have the partial flag set (%x)", | |
1085 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1086 | return 1; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* Optional transitive attributes may go through speakers that don't | |
1091 | * reocgnise them and set the Partial bit. | |
1092 | */ | |
1093 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1094 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1095 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1096 | ||
1097 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1098 | return 0; | |
1099 | ||
1100 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1101 | return 1; | |
3ecab4c8 PJ |
1102 | } |
1103 | ||
718e3744 | 1104 | /* Get origin attribute of the update message. */ |
d62a17ae | 1105 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1106 | { | |
1107 | struct peer *const peer = args->peer; | |
1108 | struct attr *const attr = args->attr; | |
1109 | const bgp_size_t length = args->length; | |
1110 | ||
1111 | /* If any recognized attribute has Attribute Length that conflicts | |
1112 | with the expected length (based on the attribute type code), then | |
1113 | the Error Subcode is set to Attribute Length Error. The Data | |
1114 | field contains the erroneous attribute (type, length and | |
1115 | value). */ | |
1116 | if (length != 1) { | |
1117 | zlog_err("Origin attribute length is not one %d", length); | |
1118 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1119 | args->total); | |
1120 | } | |
1121 | ||
1122 | /* Fetch origin attribute. */ | |
1123 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1124 | ||
1125 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1126 | Subcode is set to Invalid Origin Attribute. The Data field | |
1127 | contains the unrecognized attribute (type, length and value). */ | |
1128 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1129 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
1130 | zlog_err("Origin attribute value is invalid %d", attr->origin); | |
1131 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, | |
1132 | args->total); | |
1133 | } | |
1134 | ||
1135 | /* Set oring attribute flag. */ | |
1136 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1137 | ||
1138 | return 0; | |
718e3744 | 1139 | } |
ab005298 PJ |
1140 | |
1141 | /* Parse AS path information. This function is wrapper of | |
1142 | aspath_parse. */ | |
d62a17ae | 1143 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1144 | { | |
1145 | struct attr *const attr = args->attr; | |
1146 | struct peer *const peer = args->peer; | |
1147 | const bgp_size_t length = args->length; | |
1148 | ||
1149 | /* | |
1150 | * peer with AS4 => will get 4Byte ASnums | |
1151 | * otherwise, will get 16 Bit | |
1152 | */ | |
424ab01d | 1153 | attr->aspath = aspath_parse(peer->curr, length, |
d62a17ae | 1154 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); |
1155 | ||
1156 | /* In case of IBGP, length will be zero. */ | |
1157 | if (!attr->aspath) { | |
1158 | zlog_err("Malformed AS path from %s, length is %d", peer->host, | |
1159 | length); | |
1160 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1161 | 0); | |
1162 | } | |
0b2aa3a0 | 1163 | |
d62a17ae | 1164 | /* Set aspath attribute flag. */ |
1165 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1166 | ||
1167 | return BGP_ATTR_PARSE_PROCEED; | |
1168 | } | |
1169 | ||
1170 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1171 | struct attr *const attr) | |
1172 | { | |
1173 | /* These checks were part of bgp_attr_aspath, but with | |
1174 | * as4 we should to check aspath things when | |
1175 | * aspath synthesizing with as4_path has already taken place. | |
1176 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1177 | * not right. | |
1178 | * So do the checks later, i.e. here | |
1179 | */ | |
d62a17ae | 1180 | struct aspath *aspath; |
1181 | ||
1182 | /* Confederation sanity check. */ | |
1183 | if ((peer->sort == BGP_PEER_CONFED | |
1184 | && !aspath_left_confed_check(attr->aspath)) | |
1185 | || (peer->sort == BGP_PEER_EBGP | |
1186 | && aspath_confed_check(attr->aspath))) { | |
1187 | zlog_err("Malformed AS path from %s", peer->host); | |
1188 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1189 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1190 | return BGP_ATTR_PARSE_ERROR; | |
1191 | } | |
cddb8112 | 1192 | |
d62a17ae | 1193 | /* First AS check for EBGP. */ |
47cbc09b | 1194 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1195 | if (peer->sort == BGP_PEER_EBGP |
1196 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
1197 | zlog_err("%s incorrect first AS (must be %u)", | |
1198 | peer->host, peer->as); | |
1199 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1200 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1201 | return BGP_ATTR_PARSE_ERROR; | |
1202 | } | |
1203 | } | |
0b2aa3a0 | 1204 | |
d62a17ae | 1205 | /* local-as prepend */ |
1206 | if (peer->change_local_as | |
1207 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1208 | aspath = aspath_dup(attr->aspath); | |
1209 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1210 | aspath_unintern(&attr->aspath); | |
1211 | attr->aspath = aspath_intern(aspath); | |
1212 | } | |
0b2aa3a0 | 1213 | |
d62a17ae | 1214 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1215 | } |
1216 | ||
ab005298 PJ |
1217 | /* Parse AS4 path information. This function is another wrapper of |
1218 | aspath_parse. */ | |
d62a17ae | 1219 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1220 | struct aspath **as4_path) | |
ab005298 | 1221 | { |
d62a17ae | 1222 | struct peer *const peer = args->peer; |
1223 | struct attr *const attr = args->attr; | |
1224 | const bgp_size_t length = args->length; | |
ab005298 | 1225 | |
424ab01d | 1226 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1227 | |
d62a17ae | 1228 | /* In case of IBGP, length will be zero. */ |
1229 | if (!*as4_path) { | |
1230 | zlog_err("Malformed AS4 path from %s, length is %d", peer->host, | |
1231 | length); | |
1232 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1233 | 0); | |
1234 | } | |
ab005298 | 1235 | |
d62a17ae | 1236 | /* Set aspath attribute flag. */ |
1237 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1238 | ||
1239 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1240 | } |
1241 | ||
718e3744 | 1242 | /* Nexthop attribute. */ |
d62a17ae | 1243 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1244 | { | |
1245 | struct peer *const peer = args->peer; | |
1246 | struct attr *const attr = args->attr; | |
1247 | const bgp_size_t length = args->length; | |
1248 | ||
1249 | in_addr_t nexthop_h, nexthop_n; | |
1250 | ||
1251 | /* Check nexthop attribute length. */ | |
1252 | if (length != 4) { | |
1253 | zlog_err("Nexthop attribute length isn't four [%d]", length); | |
1254 | ||
1255 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1256 | args->total); | |
1257 | } | |
1258 | ||
1259 | /* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP | |
1260 | attribute must result in a NOTIFICATION message (this is implemented | |
1261 | below). | |
1262 | At the same time, semantically incorrect NEXT_HOP is more likely to | |
1263 | be just | |
1264 | logged locally (this is implemented somewhere else). The UPDATE | |
1265 | message | |
1266 | gets ignored in any of these cases. */ | |
424ab01d | 1267 | nexthop_n = stream_get_ipv4(peer->curr); |
d62a17ae | 1268 | nexthop_h = ntohl(nexthop_n); |
1269 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1270 | || IPV4_CLASS_DE(nexthop_h)) | |
1271 | && !BGP_DEBUG( | |
1272 | allow_martians, | |
1273 | ALLOW_MARTIANS)) /* loopbacks may be used in testing */ | |
1274 | { | |
1275 | char buf[INET_ADDRSTRLEN]; | |
1276 | inet_ntop(AF_INET, &nexthop_n, buf, INET_ADDRSTRLEN); | |
1277 | zlog_err("Martian nexthop %s", buf); | |
1278 | return bgp_attr_malformed( | |
1279 | args, BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, args->total); | |
1280 | } | |
1281 | ||
1282 | attr->nexthop.s_addr = nexthop_n; | |
1283 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1284 | ||
1285 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1286 | } |
1287 | ||
1288 | /* MED atrribute. */ | |
d62a17ae | 1289 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1290 | { |
d62a17ae | 1291 | struct peer *const peer = args->peer; |
1292 | struct attr *const attr = args->attr; | |
1293 | const bgp_size_t length = args->length; | |
b881c707 | 1294 | |
d62a17ae | 1295 | /* Length check. */ |
1296 | if (length != 4) { | |
1297 | zlog_err("MED attribute length isn't four [%d]", length); | |
718e3744 | 1298 | |
d62a17ae | 1299 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1300 | args->total); | |
1301 | } | |
1302 | ||
424ab01d | 1303 | attr->med = stream_getl(peer->curr); |
718e3744 | 1304 | |
d62a17ae | 1305 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1306 | |
d62a17ae | 1307 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1308 | } |
1309 | ||
1310 | /* Local preference attribute. */ | |
b881c707 | 1311 | static bgp_attr_parse_ret_t |
d62a17ae | 1312 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1313 | { | |
1314 | struct peer *const peer = args->peer; | |
1315 | struct attr *const attr = args->attr; | |
1316 | const bgp_size_t length = args->length; | |
1317 | ||
1318 | /* Length check. */ | |
1319 | if (length != 4) { | |
1320 | zlog_err("LOCAL_PREF attribute length isn't 4 [%u]", length); | |
1321 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1322 | args->total); | |
1323 | } | |
1324 | ||
1325 | /* If it is contained in an UPDATE message that is received from an | |
1326 | external peer, then this attribute MUST be ignored by the | |
1327 | receiving speaker. */ | |
1328 | if (peer->sort == BGP_PEER_EBGP) { | |
424ab01d | 1329 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1330 | return BGP_ATTR_PARSE_PROCEED; |
1331 | } | |
1332 | ||
424ab01d | 1333 | attr->local_pref = stream_getl(peer->curr); |
d62a17ae | 1334 | |
7f323236 | 1335 | /* Set the local-pref flag. */ |
d62a17ae | 1336 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1337 | ||
1338 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1339 | } |
1340 | ||
1341 | /* Atomic aggregate. */ | |
d62a17ae | 1342 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1343 | { |
d62a17ae | 1344 | struct attr *const attr = args->attr; |
1345 | const bgp_size_t length = args->length; | |
1346 | ||
1347 | /* Length check. */ | |
1348 | if (length != 0) { | |
1349 | zlog_err("ATOMIC_AGGREGATE attribute length isn't 0 [%u]", | |
1350 | length); | |
1351 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1352 | args->total); | |
1353 | } | |
718e3744 | 1354 | |
d62a17ae | 1355 | /* Set atomic aggregate flag. */ |
1356 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1357 | |
d62a17ae | 1358 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1359 | } |
1360 | ||
1361 | /* Aggregator attribute */ | |
d62a17ae | 1362 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1363 | { | |
1364 | struct peer *const peer = args->peer; | |
1365 | struct attr *const attr = args->attr; | |
1366 | const bgp_size_t length = args->length; | |
1367 | ||
1368 | int wantedlen = 6; | |
1369 | ||
1370 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1371 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1372 | wantedlen = 8; | |
1373 | ||
1374 | if (length != wantedlen) { | |
1375 | zlog_err("AGGREGATOR attribute length isn't %u [%u]", wantedlen, | |
1376 | length); | |
1377 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1378 | args->total); | |
1379 | } | |
1380 | ||
1381 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
424ab01d | 1382 | attr->aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1383 | else |
424ab01d QY |
1384 | attr->aggregator_as = stream_getw(peer->curr); |
1385 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1386 | |
1387 | /* Set atomic aggregate flag. */ | |
1388 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1389 | ||
1390 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1391 | } |
1392 | ||
0b2aa3a0 | 1393 | /* New Aggregator attribute */ |
b881c707 | 1394 | static bgp_attr_parse_ret_t |
d62a17ae | 1395 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1396 | as_t *as4_aggregator_as, | |
1397 | struct in_addr *as4_aggregator_addr) | |
1398 | { | |
1399 | struct peer *const peer = args->peer; | |
1400 | struct attr *const attr = args->attr; | |
1401 | const bgp_size_t length = args->length; | |
1402 | ||
1403 | if (length != 8) { | |
1404 | zlog_err("New Aggregator length is not 8 [%d]", length); | |
1405 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1406 | 0); | |
1407 | } | |
1408 | ||
424ab01d QY |
1409 | *as4_aggregator_as = stream_getl(peer->curr); |
1410 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1411 | |
1412 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1413 | ||
1414 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1415 | } |
1416 | ||
1417 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1418 | */ | |
b881c707 | 1419 | static bgp_attr_parse_ret_t |
d62a17ae | 1420 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1421 | struct aspath *as4_path, as_t as4_aggregator, | |
1422 | struct in_addr *as4_aggregator_addr) | |
1423 | { | |
1424 | int ignore_as4_path = 0; | |
1425 | struct aspath *newpath; | |
1426 | ||
1427 | if (!attr->aspath) { | |
1428 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1429 | * have | |
1430 | * checked that all well-known, mandatory attributes were | |
1431 | * present. | |
1432 | * | |
1433 | * Can only be a problem with peer itself - hard error | |
1434 | */ | |
1435 | return BGP_ATTR_PARSE_ERROR; | |
1436 | } | |
1437 | ||
1438 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1439 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1440 | * if given. | |
1441 | * It is worth a warning though, because the peer really | |
1442 | * should not send them | |
1443 | */ | |
1444 | if (BGP_DEBUG(as4, AS4)) { | |
1445 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1446 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1447 | "AS4 capable peer, yet it sent"); | |
1448 | ||
1449 | if (attr->flag | |
1450 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1451 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1452 | peer->host, | |
1453 | "AS4 capable peer, yet it sent"); | |
1454 | } | |
1455 | ||
1456 | return BGP_ATTR_PARSE_PROCEED; | |
1457 | } | |
1458 | ||
1459 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1460 | * because that may override AS4_PATH | |
1461 | */ | |
1462 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1463 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1464 | /* received both. | |
1465 | * if the as_number in aggregator is not AS_TRANS, | |
1466 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1467 | * and the Aggregator shall be taken as | |
1468 | * info on the aggregating node, and the AS_PATH | |
1469 | * shall be taken as the AS_PATH | |
1470 | * otherwise | |
1471 | * the Aggregator shall be ignored and the | |
1472 | * AS4_AGGREGATOR shall be taken as the | |
1473 | * Aggregating node and the AS_PATH is to be | |
1474 | * constructed "as in all other cases" | |
1475 | */ | |
1476 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1477 | /* ignore */ | |
1478 | if (BGP_DEBUG(as4, AS4)) | |
1479 | zlog_debug( | |
1480 | "[AS4] %s BGP not AS4 capable peer" | |
1481 | " send AGGREGATOR != AS_TRANS and" | |
1482 | " AS4_AGGREGATOR, so ignore" | |
1483 | " AS4_AGGREGATOR and AS4_PATH", | |
1484 | peer->host); | |
1485 | ignore_as4_path = 1; | |
1486 | } else { | |
1487 | /* "New_aggregator shall be taken as aggregator" | |
1488 | */ | |
1489 | attr->aggregator_as = as4_aggregator; | |
1490 | attr->aggregator_addr.s_addr = | |
1491 | as4_aggregator_addr->s_addr; | |
1492 | } | |
1493 | } else { | |
1494 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1495 | * That is bogus - but reading the conditions | |
1496 | * we have to handle AS4_AGGREGATOR as if it were | |
1497 | * AGGREGATOR in that case | |
1498 | */ | |
1499 | if (BGP_DEBUG(as4, AS4)) | |
1500 | zlog_debug( | |
1501 | "[AS4] %s BGP not AS4 capable peer send" | |
1502 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1503 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1504 | peer->host); | |
1505 | attr->aggregator_as = as4_aggregator; | |
1506 | /* sweep it under the carpet and simulate a "good" | |
1507 | * AGGREGATOR */ | |
1508 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1513 | if (!ignore_as4_path | |
1514 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1515 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1516 | if (!newpath) |
1517 | return BGP_ATTR_PARSE_ERROR; | |
1518 | ||
d62a17ae | 1519 | aspath_unintern(&attr->aspath); |
1520 | attr->aspath = aspath_intern(newpath); | |
1521 | } | |
1522 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1523 | } |
1524 | ||
718e3744 | 1525 | /* Community attribute. */ |
b881c707 | 1526 | static bgp_attr_parse_ret_t |
d62a17ae | 1527 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1528 | { | |
1529 | struct peer *const peer = args->peer; | |
1530 | struct attr *const attr = args->attr; | |
1531 | const bgp_size_t length = args->length; | |
1532 | ||
1533 | if (length == 0) { | |
1534 | attr->community = NULL; | |
1535 | return BGP_ATTR_PARSE_PROCEED; | |
1536 | } | |
1537 | ||
1538 | attr->community = | |
d7c0a89a | 1539 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1540 | |
1541 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1542 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1543 | |
1544 | if (!attr->community) | |
1545 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1546 | args->total); | |
1547 | ||
1548 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1549 | ||
1550 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1551 | } |
1552 | ||
1553 | /* Originator ID attribute. */ | |
b881c707 | 1554 | static bgp_attr_parse_ret_t |
d62a17ae | 1555 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1556 | { |
d62a17ae | 1557 | struct peer *const peer = args->peer; |
1558 | struct attr *const attr = args->attr; | |
1559 | const bgp_size_t length = args->length; | |
718e3744 | 1560 | |
d62a17ae | 1561 | /* Length check. */ |
1562 | if (length != 4) { | |
1563 | zlog_err("Bad originator ID length %d", length); | |
718e3744 | 1564 | |
d62a17ae | 1565 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1566 | args->total); | |
1567 | } | |
1568 | ||
424ab01d | 1569 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1570 | |
d62a17ae | 1571 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1572 | |
d62a17ae | 1573 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1574 | } |
1575 | ||
1576 | /* Cluster list attribute. */ | |
b881c707 | 1577 | static bgp_attr_parse_ret_t |
d62a17ae | 1578 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1579 | { |
d62a17ae | 1580 | struct peer *const peer = args->peer; |
1581 | struct attr *const attr = args->attr; | |
1582 | const bgp_size_t length = args->length; | |
1583 | ||
1584 | /* Check length. */ | |
1585 | if (length % 4) { | |
1586 | zlog_err("Bad cluster list length %d", length); | |
718e3744 | 1587 | |
d62a17ae | 1588 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1589 | args->total); | |
1590 | } | |
1591 | ||
1592 | attr->cluster = | |
424ab01d | 1593 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); |
718e3744 | 1594 | |
d62a17ae | 1595 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 1596 | stream_forward_getp(peer->curr, length); |
718e3744 | 1597 | |
d62a17ae | 1598 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1599 | |
d62a17ae | 1600 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1601 | } |
1602 | ||
1603 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1604 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1605 | struct bgp_nlri *mp_update) | |
1606 | { | |
1607 | iana_afi_t pkt_afi; | |
1608 | afi_t afi; | |
5c525538 RW |
1609 | iana_safi_t pkt_safi; |
1610 | safi_t safi; | |
d62a17ae | 1611 | bgp_size_t nlri_len; |
1612 | size_t start; | |
1613 | struct stream *s; | |
1614 | struct peer *const peer = args->peer; | |
1615 | struct attr *const attr = args->attr; | |
1616 | const bgp_size_t length = args->length; | |
1617 | ||
1618 | /* Set end of packet. */ | |
1619 | s = BGP_INPUT(peer); | |
1620 | start = stream_get_getp(s); | |
1621 | ||
1622 | /* safe to read statically sized header? */ | |
6e4ab12f | 1623 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1624 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1625 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
1626 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1627 | peer->host, (unsigned long)length); | |
1628 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1629 | } | |
1630 | ||
1631 | /* Load AFI, SAFI. */ | |
1632 | pkt_afi = stream_getw(s); | |
1633 | pkt_safi = stream_getc(s); | |
1634 | ||
1635 | /* Convert AFI, SAFI to internal values, check. */ | |
1636 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1637 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1638 | * unless | |
1639 | * the attribute is otherwise malformed. | |
1640 | */ | |
1641 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1642 | zlog_debug( | |
1643 | "%s: MP_REACH received AFI %u or SAFI %u is unrecognized", | |
1644 | peer->host, pkt_afi, pkt_safi); | |
1645 | return BGP_ATTR_PARSE_ERROR; | |
1646 | } | |
1647 | ||
1648 | /* Get nexthop length. */ | |
1649 | attr->mp_nexthop_len = stream_getc(s); | |
1650 | ||
1651 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1652 | zlog_info( | |
1653 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1654 | __func__, peer->host, attr->mp_nexthop_len); | |
1655 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1656 | } | |
1657 | ||
1658 | /* Nexthop length check. */ | |
1659 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 1660 | case 0: |
1661 | if (safi != SAFI_FLOWSPEC) { | |
1662 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1663 | __func__, peer->host, attr->mp_nexthop_len); | |
1664 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1665 | } | |
1666 | break; | |
b6453163 LB |
1667 | case BGP_ATTR_NHLEN_VPNV4: |
1668 | stream_getl(s); /* RD high */ | |
1669 | stream_getl(s); /* RD low */ | |
996c9314 LB |
1670 | /* |
1671 | * NOTE: intentional fall through | |
1672 | * - for consistency in rx processing | |
1673 | * | |
1674 | * The following comment is to signal GCC this intention | |
1675 | * and supress the warning | |
1676 | */ | |
1677 | /* FALLTHRU */ | |
d62a17ae | 1678 | case BGP_ATTR_NHLEN_IPV4: |
1679 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1680 | /* Probably needed for RFC 2283 */ | |
1681 | if (attr->nexthop.s_addr == 0) | |
1682 | memcpy(&attr->nexthop.s_addr, | |
1683 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1684 | break; | |
d62a17ae | 1685 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
1686 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1687 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1688 | stream_getl(s); /* RD high */ | |
1689 | stream_getl(s); /* RD low */ | |
1690 | } | |
1691 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
77e62f2b | 1692 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) |
1693 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
d62a17ae | 1694 | break; |
1695 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1696 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1697 | if (attr->mp_nexthop_len | |
1698 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1699 | stream_getl(s); /* RD high */ | |
1700 | stream_getl(s); /* RD low */ | |
1701 | } | |
1702 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
77e62f2b | 1703 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) |
1704 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; | |
d62a17ae | 1705 | if (attr->mp_nexthop_len |
1706 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1707 | stream_getl(s); /* RD high */ | |
1708 | stream_getl(s); /* RD low */ | |
1709 | } | |
1710 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1711 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1712 | char buf1[INET6_ADDRSTRLEN]; | |
1713 | char buf2[INET6_ADDRSTRLEN]; | |
1714 | ||
1715 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1716 | zlog_debug( | |
1717 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1718 | peer->host, | |
1719 | inet_ntop(AF_INET6, | |
1720 | &attr->mp_nexthop_global, | |
1721 | buf1, INET6_ADDRSTRLEN), | |
1722 | inet_ntop(AF_INET6, | |
1723 | &attr->mp_nexthop_local, buf2, | |
1724 | INET6_ADDRSTRLEN)); | |
1725 | ||
1726 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1727 | } | |
77e62f2b | 1728 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 1729 | break; |
1730 | default: | |
1731 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1732 | __func__, peer->host, attr->mp_nexthop_len); | |
1733 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1734 | } | |
1735 | ||
1736 | if (!LEN_LEFT) { | |
1737 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1738 | peer->host); | |
1739 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1740 | } | |
1741 | ||
718e3744 | 1742 | { |
d7c0a89a | 1743 | uint8_t val; |
d62a17ae | 1744 | if ((val = stream_getc(s))) |
1745 | zlog_warn( | |
1746 | "%s sent non-zero value, %u, for defunct SNPA-length field", | |
1747 | peer->host, val); | |
1748 | } | |
1749 | ||
1750 | /* must have nrli_len, what is left of the attribute */ | |
1751 | nlri_len = LEN_LEFT; | |
9b9df989 | 1752 | if (nlri_len > STREAM_READABLE(s)) { |
d62a17ae | 1753 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); |
1754 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1755 | } | |
1756 | ||
9b9df989 DS |
1757 | if (!nlri_len) { |
1758 | zlog_info("%s: (%s) No Reachability, Treating as a EOR marker", | |
1759 | __func__, peer->host); | |
1760 | ||
1761 | mp_update->afi = afi; | |
1762 | mp_update->safi = safi; | |
1763 | return BGP_ATTR_PARSE_EOR; | |
1764 | } | |
1765 | ||
d62a17ae | 1766 | mp_update->afi = afi; |
1767 | mp_update->safi = safi; | |
1768 | mp_update->nlri = stream_pnt(s); | |
1769 | mp_update->length = nlri_len; | |
1770 | ||
1771 | stream_forward_getp(s, nlri_len); | |
1772 | ||
1773 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1774 | ||
1775 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 1776 | #undef LEN_LEFT |
718e3744 | 1777 | } |
1778 | ||
1779 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 1780 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
1781 | struct bgp_nlri *mp_withdraw) | |
1782 | { | |
1783 | struct stream *s; | |
1784 | iana_afi_t pkt_afi; | |
1785 | afi_t afi; | |
5c525538 RW |
1786 | iana_safi_t pkt_safi; |
1787 | safi_t safi; | |
d7c0a89a | 1788 | uint16_t withdraw_len; |
d62a17ae | 1789 | struct peer *const peer = args->peer; |
1790 | struct attr *const attr = args->attr; | |
1791 | const bgp_size_t length = args->length; | |
9cabb64b | 1792 | |
424ab01d | 1793 | s = peer->curr; |
9cabb64b | 1794 | |
d62a17ae | 1795 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
1796 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1797 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1798 | ||
1799 | pkt_afi = stream_getw(s); | |
1800 | pkt_safi = stream_getc(s); | |
1801 | ||
1802 | /* Convert AFI, SAFI to internal values, check. */ | |
1803 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1804 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1805 | * unless | |
1806 | * the attribute is otherwise malformed. | |
1807 | */ | |
1808 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1809 | zlog_debug( | |
1810 | "%s: MP_UNREACH received AFI %u or SAFI %u is unrecognized", | |
1811 | peer->host, pkt_afi, pkt_safi); | |
1812 | return BGP_ATTR_PARSE_ERROR; | |
1813 | } | |
718e3744 | 1814 | |
d62a17ae | 1815 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1816 | |
d62a17ae | 1817 | mp_withdraw->afi = afi; |
1818 | mp_withdraw->safi = safi; | |
1819 | mp_withdraw->nlri = stream_pnt(s); | |
1820 | mp_withdraw->length = withdraw_len; | |
718e3744 | 1821 | |
d62a17ae | 1822 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 1823 | |
d62a17ae | 1824 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
1825 | ||
1826 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1827 | } |
1828 | ||
57d187bc JS |
1829 | /* Large Community attribute. */ |
1830 | static bgp_attr_parse_ret_t | |
d62a17ae | 1831 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
1832 | { | |
1833 | struct peer *const peer = args->peer; | |
1834 | struct attr *const attr = args->attr; | |
1835 | const bgp_size_t length = args->length; | |
1836 | ||
1837 | /* | |
1838 | * Large community follows new attribute format. | |
1839 | */ | |
1840 | if (length == 0) { | |
1841 | attr->lcommunity = NULL; | |
1842 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1843 | return BGP_ATTR_PARSE_PROCEED; | |
1844 | } | |
57d187bc | 1845 | |
d62a17ae | 1846 | attr->lcommunity = |
d7c0a89a | 1847 | lcommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1848 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1849 | stream_forward_getp(peer->curr, length); |
57d187bc | 1850 | |
d62a17ae | 1851 | if (!attr->lcommunity) |
1852 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1853 | args->total); | |
57d187bc | 1854 | |
d62a17ae | 1855 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 1856 | |
d62a17ae | 1857 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
1858 | } |
1859 | ||
718e3744 | 1860 | /* Extended Community attribute. */ |
b881c707 | 1861 | static bgp_attr_parse_ret_t |
d62a17ae | 1862 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
1863 | { | |
1864 | struct peer *const peer = args->peer; | |
1865 | struct attr *const attr = args->attr; | |
1866 | const bgp_size_t length = args->length; | |
d7c0a89a | 1867 | uint8_t sticky = 0; |
d62a17ae | 1868 | |
1869 | if (length == 0) { | |
1870 | attr->ecommunity = NULL; | |
1871 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1872 | return BGP_ATTR_PARSE_PROCEED; | |
1873 | } | |
1874 | ||
1875 | attr->ecommunity = | |
d7c0a89a | 1876 | ecommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1877 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1878 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1879 | |
1880 | if (!attr->ecommunity) | |
1881 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1882 | args->total); | |
1883 | ||
1884 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1885 | ||
1886 | /* Extract MAC mobility sequence number, if any. */ | |
1887 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1888 | attr->sticky = sticky; | |
1889 | ||
ead40654 MK |
1890 | /* Check if this is a Gateway MAC-IP advertisement */ |
1891 | attr->default_gw = bgp_attr_default_gw(attr); | |
1892 | ||
bc59a672 MK |
1893 | /* Extract the Rmac, if any */ |
1894 | bgp_attr_rmac(attr, &attr->rmac); | |
1895 | ||
d62a17ae | 1896 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1897 | } |
1898 | ||
f4c89855 | 1899 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 1900 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
1901 | bgp_size_t length, /* IN: attr's length field */ | |
1902 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
1903 | uint8_t flag, /* IN: attr's flags field */ |
1904 | uint8_t *startp) | |
d62a17ae | 1905 | { |
1906 | bgp_size_t total; | |
d62a17ae | 1907 | uint16_t tunneltype = 0; |
1908 | ||
1909 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1910 | ||
1911 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1912 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1913 | zlog_info( | |
1914 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1915 | flag); | |
1916 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1917 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1918 | startp, total); | |
1919 | return -1; | |
1920 | } | |
1921 | ||
1922 | if (BGP_ATTR_ENCAP == type) { | |
1923 | /* read outer TLV type and length */ | |
1924 | uint16_t tlv_length; | |
1925 | ||
1926 | if (length < 4) { | |
1927 | zlog_info( | |
1928 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1929 | bgp_notify_send_with_data( | |
1930 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1931 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1932 | return -1; | |
1933 | } | |
1934 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
1935 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
1936 | length -= 4; | |
1937 | ||
1938 | if (tlv_length != length) { | |
1939 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
1940 | tlv_length, length); | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | while (length >= 4) { | |
1945 | uint16_t subtype = 0; | |
1946 | uint16_t sublength = 0; | |
1947 | struct bgp_attr_encap_subtlv *tlv; | |
1948 | ||
1949 | if (BGP_ATTR_ENCAP == type) { | |
1950 | subtype = stream_getc(BGP_INPUT(peer)); | |
1951 | sublength = stream_getc(BGP_INPUT(peer)); | |
1952 | length -= 2; | |
65efcfce | 1953 | #if ENABLE_BGP_VNC |
d62a17ae | 1954 | } else { |
1955 | subtype = stream_getw(BGP_INPUT(peer)); | |
1956 | sublength = stream_getw(BGP_INPUT(peer)); | |
1957 | length -= 4; | |
65efcfce | 1958 | #endif |
d62a17ae | 1959 | } |
1960 | ||
1961 | if (sublength > length) { | |
1962 | zlog_info( | |
1963 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
1964 | sublength, length); | |
1965 | bgp_notify_send_with_data( | |
1966 | peer, BGP_NOTIFY_UPDATE_ERR, | |
1967 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
1968 | return -1; | |
1969 | } | |
1970 | ||
1971 | /* alloc and copy sub-tlv */ | |
1972 | /* TBD make sure these are freed when attributes are released */ | |
1973 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 1974 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 1975 | tlv->type = subtype; |
1976 | tlv->length = sublength; | |
424ab01d | 1977 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 1978 | length -= sublength; |
1979 | ||
1980 | /* attach tlv to encap chain */ | |
1981 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 1982 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1983 | for (stlv_last = attr->encap_subtlvs; |
1984 | stlv_last && stlv_last->next; | |
1985 | stlv_last = stlv_last->next) | |
1986 | ; | |
1987 | if (stlv_last) { | |
1988 | stlv_last->next = tlv; | |
1989 | } else { | |
1990 | attr->encap_subtlvs = tlv; | |
1991 | } | |
65efcfce | 1992 | #if ENABLE_BGP_VNC |
d62a17ae | 1993 | } else { |
e4002056 | 1994 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 1995 | for (stlv_last = attr->vnc_subtlvs; |
1996 | stlv_last && stlv_last->next; | |
1997 | stlv_last = stlv_last->next) | |
1998 | ; | |
1999 | if (stlv_last) { | |
2000 | stlv_last->next = tlv; | |
2001 | } else { | |
2002 | attr->vnc_subtlvs = tlv; | |
2003 | } | |
aadc0905 | 2004 | #endif |
d62a17ae | 2005 | } |
d62a17ae | 2006 | } |
f4c89855 | 2007 | |
d62a17ae | 2008 | if (BGP_ATTR_ENCAP == type) { |
2009 | attr->encap_tunneltype = tunneltype; | |
2010 | } | |
f4c89855 | 2011 | |
d62a17ae | 2012 | if (length) { |
2013 | /* spurious leftover data */ | |
2014 | zlog_info( | |
2015 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2016 | length); | |
2017 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2018 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2019 | startp, total); | |
2020 | return -1; | |
2021 | } | |
f4c89855 | 2022 | |
d62a17ae | 2023 | return 0; |
f4c89855 LB |
2024 | } |
2025 | ||
30adbd4e DS |
2026 | /* |
2027 | * Read an individual SID value returning how much data we have read | |
2028 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2029 | */ |
30adbd4e DS |
2030 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(int32_t type, |
2031 | int32_t length, | |
2032 | struct bgp_attr_parser_args *args, | |
2033 | struct bgp_nlri *mp_update) | |
d62a17ae | 2034 | { |
2035 | struct peer *const peer = args->peer; | |
2036 | struct attr *const attr = args->attr; | |
d7c0a89a | 2037 | uint32_t label_index; |
d62a17ae | 2038 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2039 | uint32_t srgb_base; |
2040 | uint32_t srgb_range; | |
d62a17ae | 2041 | int srgb_count; |
2042 | ||
d62a17ae | 2043 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
2044 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2045 | zlog_err( | |
30adbd4e DS |
2046 | "Prefix SID label index length is %d instead of %d", |
2047 | length, | |
2048 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
2049 | return bgp_attr_malformed(args, | |
2050 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2051 | args->total); | |
d62a17ae | 2052 | } |
2053 | ||
2054 | /* Ignore flags and reserved */ | |
424ab01d QY |
2055 | stream_getc(peer->curr); |
2056 | stream_getw(peer->curr); | |
d62a17ae | 2057 | |
2058 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2059 | label_index = stream_getl(peer->curr); |
d62a17ae | 2060 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2061 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2062 | args->total); | |
d62a17ae | 2063 | |
2064 | /* Store label index; subsequently, we'll check on | |
2065 | * address-family */ | |
2066 | attr->label_index = label_index; | |
2067 | ||
2068 | /* | |
2069 | * Ignore the Label index attribute unless received for | |
2070 | * labeled-unicast | |
2071 | * SAFI. | |
2072 | */ | |
2073 | if (!mp_update->length | |
2074 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2075 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2076 | } | |
2077 | ||
2078 | /* Placeholder code for the IPv6 SID type */ | |
2079 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2080 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
2081 | zlog_err("Prefix SID IPv6 length is %d instead of %d", | |
2082 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
30adbd4e DS |
2083 | return bgp_attr_malformed(args, |
2084 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2085 | args->total); | |
d62a17ae | 2086 | } |
2087 | ||
2088 | /* Ignore reserved */ | |
424ab01d QY |
2089 | stream_getc(peer->curr); |
2090 | stream_getw(peer->curr); | |
d62a17ae | 2091 | |
424ab01d | 2092 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2093 | } |
2094 | ||
2095 | /* Placeholder code for the Originator SRGB type */ | |
2096 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2097 | /* Ignore flags */ | |
424ab01d | 2098 | stream_getw(peer->curr); |
d62a17ae | 2099 | |
2100 | length -= 2; | |
2101 | ||
2102 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
2103 | zlog_err( | |
2104 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", | |
2105 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2106 | return bgp_attr_malformed( | |
2107 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2108 | args->total); | |
2109 | } | |
2110 | ||
2111 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2112 | ||
2113 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2114 | stream_get(&srgb_base, peer->curr, 3); |
2115 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2116 | } |
2117 | } | |
2118 | ||
2119 | return BGP_ATTR_PARSE_PROCEED; | |
6cf48acc VV |
2120 | } |
2121 | ||
30adbd4e DS |
2122 | /* Prefix SID attribute |
2123 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2124 | */ | |
2125 | bgp_attr_parse_ret_t | |
2126 | bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args, | |
2127 | struct bgp_nlri *mp_update) | |
2128 | { | |
2129 | struct peer *const peer = args->peer; | |
2130 | struct attr *const attr = args->attr; | |
2131 | bgp_attr_parse_ret_t ret; | |
2132 | ||
2133 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2134 | ||
2135 | while (tlength) { | |
2136 | int32_t type, length; | |
2137 | ||
2138 | type = stream_getc(peer->curr); | |
2139 | length = stream_getw(peer->curr); | |
2140 | ||
2141 | ret = bgp_attr_psid_sub(type, length, args, mp_update); | |
2142 | ||
2143 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2144 | return ret; | |
2145 | /* | |
2146 | * Subtract length + the T and the L | |
2147 | * since length is the Vector portion | |
2148 | */ | |
2149 | tlength -= length + 3; | |
2150 | ||
2151 | if (tlength < 0) { | |
2152 | zlog_err("Prefix SID internal length %d causes us to read beyond the total Prefix SID length", | |
2153 | length); | |
2154 | return bgp_attr_malformed(args, | |
2155 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2156 | args->total); | |
2157 | } | |
2158 | } | |
2159 | ||
2160 | return BGP_ATTR_PARSE_PROCEED; | |
2161 | } | |
2162 | ||
7fd077aa | 2163 | /* PMSI tunnel attribute (RFC 6514) |
2164 | * Basic validation checks done here. | |
2165 | */ | |
2166 | static bgp_attr_parse_ret_t | |
2167 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2168 | { | |
2169 | struct peer *const peer = args->peer; | |
2170 | struct attr *const attr = args->attr; | |
2171 | const bgp_size_t length = args->length; | |
d7c0a89a | 2172 | uint8_t tnl_type; |
7fd077aa | 2173 | |
2174 | /* Verify that the receiver is expecting "ingress replication" as we | |
2175 | * can only support that. | |
2176 | */ | |
2177 | if (length < 2) { | |
2178 | zlog_err("Bad PMSI tunnel attribute length %d", length); | |
2179 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2180 | args->total); | |
2181 | } | |
2182 | stream_getc(peer->curr); /* Flags */ | |
2183 | tnl_type = stream_getc(peer->curr); | |
2184 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
2185 | zlog_err("Invalid PMSI tunnel attribute type %d", tnl_type); | |
2186 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2187 | args->total); | |
2188 | } | |
2189 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2190 | if (length != 9) { | |
2191 | zlog_err("Bad PMSI tunnel attribute length %d for IR", | |
052ea98b | 2192 | length); |
2193 | return bgp_attr_malformed( | |
2194 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2195 | args->total); | |
7fd077aa | 2196 | } |
2197 | } | |
2198 | ||
2199 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2200 | attr->pmsi_tnl_type = tnl_type; | |
2201 | ||
2202 | /* Forward read pointer of input stream. */ | |
2203 | stream_forward_getp(peer->curr, length - 2); | |
2204 | ||
2205 | return BGP_ATTR_PARSE_PROCEED; | |
2206 | } | |
2207 | ||
718e3744 | 2208 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2209 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2210 | { | |
2211 | bgp_size_t total = args->total; | |
2212 | struct transit *transit; | |
2213 | struct peer *const peer = args->peer; | |
2214 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
2215 | uint8_t *const startp = args->startp; |
2216 | const uint8_t type = args->type; | |
2217 | const uint8_t flag = args->flags; | |
d62a17ae | 2218 | const bgp_size_t length = args->length; |
2219 | ||
2220 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2221 | zlog_debug( | |
2222 | "%s Unknown attribute is received (type %d, length %d)", | |
2223 | peer->host, type, length); | |
2224 | ||
2225 | /* Forward read pointer of input stream. */ | |
424ab01d | 2226 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2227 | |
2228 | /* If any of the mandatory well-known attributes are not recognized, | |
2229 | then the Error Subcode is set to Unrecognized Well-known | |
2230 | Attribute. The Data field contains the unrecognized attribute | |
2231 | (type, length and value). */ | |
2232 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2233 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2234 | args->total); | |
2235 | } | |
2236 | ||
2237 | /* Unrecognized non-transitive optional attributes must be quietly | |
2238 | ignored and not passed along to other BGP peers. */ | |
2239 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2240 | return BGP_ATTR_PARSE_PROCEED; | |
2241 | ||
2242 | /* If a path with recognized transitive optional attribute is | |
2243 | accepted and passed along to other BGP peers and the Partial bit | |
2244 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2245 | is not set back to 0 by the current AS. */ | |
2246 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2247 | ||
2248 | /* Store transitive attribute to the end of attr->transit. */ | |
2249 | if (!attr->transit) | |
2250 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2251 | ||
2252 | transit = attr->transit; | |
2253 | ||
2254 | if (transit->val) | |
2255 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2256 | transit->length + total); | |
2257 | else | |
2258 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2259 | ||
2260 | memcpy(transit->val + transit->length, startp, total); | |
2261 | transit->length += total; | |
2262 | ||
2263 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2264 | } |
2265 | ||
bb7bef14 | 2266 | /* Well-known attribute check. */ |
d62a17ae | 2267 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2268 | { | |
d7c0a89a | 2269 | uint8_t type = 0; |
d62a17ae | 2270 | |
2271 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2272 | * empty UPDATE. */ | |
2273 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2274 | return BGP_ATTR_PARSE_PROCEED; | |
2275 | ||
2276 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2277 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2278 | are present, it should. Check for any other attribute being present | |
2279 | instead. | |
2280 | */ | |
404c82d5 PG |
2281 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
2282 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 2283 | return BGP_ATTR_PARSE_PROCEED; |
2284 | ||
2285 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2286 | type = BGP_ATTR_ORIGIN; | |
2287 | ||
2288 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2289 | type = BGP_ATTR_AS_PATH; | |
2290 | ||
2291 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2292 | * and | |
2293 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2294 | */ | |
2295 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2296 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2297 | type = BGP_ATTR_NEXT_HOP; | |
2298 | ||
2299 | if (peer->sort == BGP_PEER_IBGP | |
2300 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2301 | type = BGP_ATTR_LOCAL_PREF; | |
2302 | ||
2303 | if (type) { | |
2304 | zlog_warn("%s Missing well-known attribute %s.", peer->host, | |
2305 | lookup_msg(attr_str, type, NULL)); | |
2306 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2307 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2308 | 1); | |
2309 | return BGP_ATTR_PARSE_ERROR; | |
2310 | } | |
2311 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2312 | } |
2313 | ||
718e3744 | 2314 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2315 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2316 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2317 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2318 | struct bgp_nlri *mp_withdraw) | |
2319 | { | |
2320 | int ret; | |
d7c0a89a QY |
2321 | uint8_t flag = 0; |
2322 | uint8_t type = 0; | |
d62a17ae | 2323 | bgp_size_t length; |
d7c0a89a QY |
2324 | uint8_t *startp, *endp; |
2325 | uint8_t *attr_endp; | |
2326 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 2327 | /* we need the as4_path only until we have synthesized the as_path with |
2328 | * it */ | |
2329 | /* same goes for as4_aggregator */ | |
2330 | struct aspath *as4_path = NULL; | |
2331 | as_t as4_aggregator = 0; | |
2332 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2333 | ||
2334 | /* Initialize bitmap. */ | |
2335 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2336 | ||
2337 | /* End pointer of BGP attribute. */ | |
2338 | endp = BGP_INPUT_PNT(peer) + size; | |
2339 | ||
2340 | /* Get attributes to the end of attribute length. */ | |
2341 | while (BGP_INPUT_PNT(peer) < endp) { | |
2342 | /* Check remaining length check.*/ | |
2343 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2344 | /* XXX warning: long int format, int arg (arg 5) */ | |
2345 | zlog_warn( | |
2346 | "%s: error BGP attribute length %lu is smaller than min len", | |
2347 | peer->host, | |
2348 | (unsigned long)(endp | |
2d34fb80 | 2349 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2350 | |
2351 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2352 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2353 | return BGP_ATTR_PARSE_ERROR; | |
2354 | } | |
718e3744 | 2355 | |
d62a17ae | 2356 | /* Fetch attribute flag and type. */ |
2357 | startp = BGP_INPUT_PNT(peer); | |
2358 | /* "The lower-order four bits of the Attribute Flags octet are | |
2359 | unused. They MUST be zero when sent and MUST be ignored when | |
2360 | received." */ | |
2361 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2362 | type = stream_getc(BGP_INPUT(peer)); | |
2363 | ||
2364 | /* Check whether Extended-Length applies and is in bounds */ | |
2365 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2366 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
2367 | zlog_warn( | |
2368 | "%s: Extended length set, but just %lu bytes of attr header", | |
2369 | peer->host, | |
2370 | (unsigned long)(endp | |
2d34fb80 | 2371 | - stream_pnt(BGP_INPUT(peer)))); |
d62a17ae | 2372 | |
2373 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2374 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2375 | return BGP_ATTR_PARSE_ERROR; | |
2376 | } | |
718e3744 | 2377 | |
d62a17ae | 2378 | /* Check extended attribue length bit. */ |
2379 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2380 | length = stream_getw(BGP_INPUT(peer)); | |
2381 | else | |
2382 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2383 | |
d62a17ae | 2384 | /* If any attribute appears more than once in the UPDATE |
2385 | message, then the Error Subcode is set to Malformed Attribute | |
2386 | List. */ | |
718e3744 | 2387 | |
d62a17ae | 2388 | if (CHECK_BITMAP(seen, type)) { |
2389 | zlog_warn( | |
2390 | "%s: error BGP attribute type %d appears twice in a message", | |
2391 | peer->host, type); | |
718e3744 | 2392 | |
d62a17ae | 2393 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2394 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2395 | return BGP_ATTR_PARSE_ERROR; | |
2396 | } | |
2397 | ||
2398 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2399 | unsigned char so it never overflow bitmap range. */ | |
2400 | ||
2401 | SET_BITMAP(seen, type); | |
2402 | ||
2403 | /* Overflow check. */ | |
2404 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2405 | ||
2406 | if (attr_endp > endp) { | |
2407 | zlog_warn( | |
2408 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", | |
2409 | peer->host, type, length, size, attr_endp, | |
2410 | endp); | |
dacffad4 QY |
2411 | /* |
2412 | * RFC 4271 6.3 | |
2413 | * If any recognized attribute has an Attribute | |
2414 | * Length that conflicts with the expected length | |
2415 | * (based on the attribute type code), then the | |
2416 | * Error Subcode MUST be set to Attribute Length | |
2417 | * Error. The Data field MUST contain the erroneous | |
2418 | * attribute (type, length, and value). | |
2419 | * ---------- | |
2420 | * We do not currently have a good way to determine the | |
2421 | * length of the attribute independent of the length | |
2422 | * received in the message. Instead we send the | |
2423 | * minimum between the amount of data we have and the | |
2424 | * amount specified by the attribute length field. | |
2425 | * | |
2426 | * Instead of directly passing in the packet buffer and | |
2427 | * offset we use the stream_get* functions to read into | |
2428 | * a stack buffer, since they perform bounds checking | |
2429 | * and we are working with untrusted data. | |
2430 | */ | |
2431 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
2432 | memset(ndata, 0x00, sizeof(ndata)); | |
2433 | size_t lfl = | |
2434 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
2435 | /* Rewind to end of flag field */ | |
2436 | stream_forward_getp(BGP_INPUT(peer), -(1 + lfl)); | |
2437 | /* Type */ | |
2438 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
2439 | /* Length */ | |
2440 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
2441 | /* Value */ | |
2442 | size_t atl = attr_endp - startp; | |
2443 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
2444 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
2445 | ||
d62a17ae | 2446 | bgp_notify_send_with_data( |
2447 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
2448 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
2449 | ndl + lfl + 1); | |
2450 | ||
d62a17ae | 2451 | return BGP_ATTR_PARSE_ERROR; |
2452 | } | |
2453 | ||
2454 | struct bgp_attr_parser_args attr_args = { | |
2455 | .peer = peer, | |
2456 | .length = length, | |
2457 | .attr = attr, | |
2458 | .type = type, | |
2459 | .flags = flag, | |
2460 | .startp = startp, | |
2461 | .total = attr_endp - startp, | |
2462 | }; | |
2463 | ||
2464 | ||
2465 | /* If any recognized attribute has Attribute Flags that conflict | |
2466 | with the Attribute Type Code, then the Error Subcode is set | |
2467 | to | |
2468 | Attribute Flags Error. The Data field contains the erroneous | |
2469 | attribute (type, length and value). */ | |
2470 | if (bgp_attr_flag_invalid(&attr_args)) { | |
2471 | bgp_attr_parse_ret_t ret; | |
2472 | ret = bgp_attr_malformed( | |
2473 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2474 | attr_args.total); | |
2475 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2476 | continue; | |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | /* OK check attribute and store it's value. */ | |
2481 | switch (type) { | |
2482 | case BGP_ATTR_ORIGIN: | |
2483 | ret = bgp_attr_origin(&attr_args); | |
2484 | break; | |
2485 | case BGP_ATTR_AS_PATH: | |
2486 | ret = bgp_attr_aspath(&attr_args); | |
2487 | break; | |
2488 | case BGP_ATTR_AS4_PATH: | |
2489 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2490 | break; | |
2491 | case BGP_ATTR_NEXT_HOP: | |
2492 | ret = bgp_attr_nexthop(&attr_args); | |
2493 | break; | |
2494 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2495 | ret = bgp_attr_med(&attr_args); | |
2496 | break; | |
2497 | case BGP_ATTR_LOCAL_PREF: | |
2498 | ret = bgp_attr_local_pref(&attr_args); | |
2499 | break; | |
2500 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2501 | ret = bgp_attr_atomic(&attr_args); | |
2502 | break; | |
2503 | case BGP_ATTR_AGGREGATOR: | |
2504 | ret = bgp_attr_aggregator(&attr_args); | |
2505 | break; | |
2506 | case BGP_ATTR_AS4_AGGREGATOR: | |
2507 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2508 | &as4_aggregator, | |
2509 | &as4_aggregator_addr); | |
2510 | break; | |
2511 | case BGP_ATTR_COMMUNITIES: | |
2512 | ret = bgp_attr_community(&attr_args); | |
2513 | break; | |
2514 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2515 | ret = bgp_attr_large_community(&attr_args); | |
2516 | break; | |
2517 | case BGP_ATTR_ORIGINATOR_ID: | |
2518 | ret = bgp_attr_originator_id(&attr_args); | |
2519 | break; | |
2520 | case BGP_ATTR_CLUSTER_LIST: | |
2521 | ret = bgp_attr_cluster_list(&attr_args); | |
2522 | break; | |
2523 | case BGP_ATTR_MP_REACH_NLRI: | |
2524 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2525 | break; | |
2526 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2527 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2528 | break; | |
2529 | case BGP_ATTR_EXT_COMMUNITIES: | |
2530 | ret = bgp_attr_ext_communities(&attr_args); | |
2531 | break; | |
65efcfce | 2532 | #if ENABLE_BGP_VNC |
d62a17ae | 2533 | case BGP_ATTR_VNC: |
65efcfce | 2534 | #endif |
d62a17ae | 2535 | case BGP_ATTR_ENCAP: |
2536 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2537 | startp); | |
2538 | break; | |
2539 | case BGP_ATTR_PREFIX_SID: | |
30adbd4e DS |
2540 | ret = bgp_attr_prefix_sid(length, |
2541 | &attr_args, mp_update); | |
d62a17ae | 2542 | break; |
7fd077aa | 2543 | case BGP_ATTR_PMSI_TUNNEL: |
2544 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
2545 | break; | |
d62a17ae | 2546 | default: |
2547 | ret = bgp_attr_unknown(&attr_args); | |
2548 | break; | |
2549 | } | |
2550 | ||
2551 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2552 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2553 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2554 | ret = BGP_ATTR_PARSE_ERROR; | |
2555 | } | |
2556 | ||
9b9df989 DS |
2557 | if (ret == BGP_ATTR_PARSE_EOR) { |
2558 | if (as4_path) | |
2559 | aspath_unintern(&as4_path); | |
2560 | return ret; | |
2561 | } | |
2562 | ||
d62a17ae | 2563 | /* If hard error occured immediately return to the caller. */ |
2564 | if (ret == BGP_ATTR_PARSE_ERROR) { | |
2565 | zlog_warn("%s: Attribute %s, parse error", peer->host, | |
2566 | lookup_msg(attr_str, type, NULL)); | |
2567 | if (as4_path) | |
2568 | aspath_unintern(&as4_path); | |
2569 | return ret; | |
2570 | } | |
2571 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2572 | ||
2573 | zlog_warn( | |
2574 | "%s: Attribute %s, parse error - treating as withdrawal", | |
2575 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2576 | if (as4_path) | |
2577 | aspath_unintern(&as4_path); | |
2578 | return ret; | |
2579 | } | |
2580 | ||
2581 | /* Check the fetched length. */ | |
2582 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
2583 | zlog_warn("%s: BGP attribute %s, fetch error", | |
2584 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2585 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2586 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2587 | if (as4_path) | |
2588 | aspath_unintern(&as4_path); | |
2589 | return BGP_ATTR_PARSE_ERROR; | |
2590 | } | |
718e3744 | 2591 | } |
d62a17ae | 2592 | |
2593 | /* Check final read pointer is same as end pointer. */ | |
2594 | if (BGP_INPUT_PNT(peer) != endp) { | |
2595 | zlog_warn("%s: BGP attribute %s, length mismatch", peer->host, | |
2596 | lookup_msg(attr_str, type, NULL)); | |
2597 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2598 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2599 | if (as4_path) | |
2600 | aspath_unintern(&as4_path); | |
2601 | return BGP_ATTR_PARSE_ERROR; | |
2602 | } | |
2603 | ||
2604 | /* Check all mandatory well-known attributes are present */ | |
718e3744 | 2605 | { |
d62a17ae | 2606 | bgp_attr_parse_ret_t ret; |
2607 | if ((ret = bgp_attr_check(peer, attr)) < 0) { | |
2608 | if (as4_path) | |
2609 | aspath_unintern(&as4_path); | |
2610 | return ret; | |
2611 | } | |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * At this place we can see whether we got AS4_PATH and/or | |
2616 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2617 | * We can not do this before we've read all attributes because | |
2618 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2619 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2620 | * in relationship to AGGREGATOR. | |
2621 | * So, to be defensive, we are not relying on any order and read | |
2622 | * all attributes first, including these 32bit ones, and now, | |
2623 | * afterwards, we look what and if something is to be done for as4. | |
2624 | * | |
2625 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2626 | * MP_UNREACH_NLRI. | |
2627 | */ | |
2628 | /* actually... this doesn't ever return failure currently, but | |
2629 | * better safe than sorry */ | |
2630 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2631 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2632 | &as4_aggregator_addr)) { | |
2633 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2634 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2635 | if (as4_path) | |
2636 | aspath_unintern(&as4_path); | |
2637 | return BGP_ATTR_PARSE_ERROR; | |
2638 | } | |
2639 | ||
2640 | /* At this stage, we have done all fiddling with as4, and the | |
2641 | * resulting info is in attr->aggregator resp. attr->aspath | |
2642 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2643 | * order to save memory | |
2644 | */ | |
2645 | if (as4_path) { | |
2646 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2647 | /* The flag that we got this is still there, but that does not | |
2648 | * do any trouble | |
2649 | */ | |
2650 | } | |
2651 | /* | |
2652 | * The "rest" of the code does nothing with as4_aggregator. | |
2653 | * there is no memory attached specifically which is not part | |
2654 | * of the attr. | |
2655 | * so ignoring just means do nothing. | |
2656 | */ | |
2657 | /* | |
2658 | * Finally do the checks on the aspath we did not do yet | |
2659 | * because we waited for a potentially synthesized aspath. | |
2660 | */ | |
2661 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2662 | ret = bgp_attr_aspath_check(peer, attr); | |
2663 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2664 | return ret; | |
2665 | } | |
2666 | /* Finally intern unknown attribute. */ | |
2667 | if (attr->transit) | |
2668 | attr->transit = transit_intern(attr->transit); | |
2669 | if (attr->encap_subtlvs) | |
2670 | attr->encap_subtlvs = | |
2671 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2672 | #if ENABLE_BGP_VNC |
d62a17ae | 2673 | if (attr->vnc_subtlvs) |
2674 | attr->vnc_subtlvs = | |
2675 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2676 | #endif |
718e3744 | 2677 | |
d62a17ae | 2678 | return BGP_ATTR_PARSE_PROCEED; |
2679 | } | |
2680 | ||
2681 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, | |
2682 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2683 | struct attr *attr) | |
2684 | { | |
2685 | size_t sizep; | |
2686 | iana_afi_t pkt_afi; | |
5c525538 | 2687 | iana_safi_t pkt_safi; |
d62a17ae | 2688 | afi_t nh_afi; |
2689 | ||
2690 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2691 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2692 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2693 | sizep = stream_get_endp(s); | |
2694 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2695 | ||
2696 | ||
2697 | /* Convert AFI, SAFI to values for packet. */ | |
2698 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2699 | ||
2700 | stream_putw(s, pkt_afi); /* AFI */ | |
2701 | stream_putc(s, pkt_safi); /* SAFI */ | |
2702 | ||
2703 | /* Nexthop AFI */ | |
ce78a6fb | 2704 | if (afi == AFI_IP |
2705 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
d62a17ae | 2706 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
d62a17ae | 2707 | else |
2708 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2709 | ||
2710 | /* Nexthop */ | |
2711 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2712 | switch (nh_afi) { | |
2713 | case AFI_IP: | |
2714 | switch (safi) { | |
2715 | case SAFI_UNICAST: | |
2716 | case SAFI_MULTICAST: | |
2717 | case SAFI_LABELED_UNICAST: | |
2718 | stream_putc(s, 4); | |
2719 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2720 | break; | |
2721 | case SAFI_MPLS_VPN: | |
2722 | stream_putc(s, 12); | |
2723 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2724 | stream_putl(s, 0); | |
2725 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2726 | break; | |
2727 | case SAFI_ENCAP: | |
2728 | case SAFI_EVPN: | |
2729 | stream_putc(s, 4); | |
2730 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2731 | break; | |
7c40bf39 | 2732 | case SAFI_FLOWSPEC: |
2733 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2734 | default: |
2735 | break; | |
2736 | } | |
2737 | break; | |
2738 | case AFI_IP6: | |
2739 | switch (safi) { | |
2740 | case SAFI_UNICAST: | |
2741 | case SAFI_MULTICAST: | |
2742 | case SAFI_LABELED_UNICAST: | |
2743 | case SAFI_EVPN: { | |
2744 | if (attr->mp_nexthop_len | |
2745 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2746 | stream_putc(s, | |
2747 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2748 | stream_put(s, &attr->mp_nexthop_global, | |
2749 | IPV6_MAX_BYTELEN); | |
2750 | stream_put(s, &attr->mp_nexthop_local, | |
2751 | IPV6_MAX_BYTELEN); | |
2752 | } else { | |
2753 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2754 | stream_put(s, &attr->mp_nexthop_global, | |
2755 | IPV6_MAX_BYTELEN); | |
2756 | } | |
2757 | } break; | |
2758 | case SAFI_MPLS_VPN: { | |
2759 | if (attr->mp_nexthop_len | |
2760 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2761 | stream_putc(s, 24); | |
2762 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2763 | stream_putl(s, 0); | |
2764 | stream_put(s, &attr->mp_nexthop_global, | |
2765 | IPV6_MAX_BYTELEN); | |
2766 | } else if (attr->mp_nexthop_len | |
2767 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2768 | stream_putc(s, 48); | |
2769 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2770 | stream_putl(s, 0); | |
2771 | stream_put(s, &attr->mp_nexthop_global, | |
2772 | IPV6_MAX_BYTELEN); | |
2773 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2774 | stream_putl(s, 0); | |
2775 | stream_put(s, &attr->mp_nexthop_local, | |
2776 | IPV6_MAX_BYTELEN); | |
2777 | } | |
2778 | } break; | |
2779 | case SAFI_ENCAP: | |
2780 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2781 | stream_put(s, &attr->mp_nexthop_global, | |
2782 | IPV6_MAX_BYTELEN); | |
2783 | break; | |
7c40bf39 | 2784 | case SAFI_FLOWSPEC: |
2785 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2786 | default: |
2787 | break; | |
2788 | } | |
2789 | break; | |
8c71e481 | 2790 | default: |
a83da8e1 PG |
2791 | if (safi != SAFI_FLOWSPEC) |
2792 | zlog_err( | |
2793 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", | |
2794 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 2795 | break; |
2796 | } | |
2797 | ||
2798 | /* SNPA */ | |
2799 | stream_putc(s, 0); | |
2800 | return sizep; | |
2801 | } | |
2802 | ||
2803 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2804 | struct prefix *p, struct prefix_rd *prd, | |
d7c0a89a QY |
2805 | mpls_label_t *label, uint32_t num_labels, |
2806 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 2807 | struct attr *attr) |
d62a17ae | 2808 | { |
2809 | if (safi == SAFI_MPLS_VPN) { | |
2810 | if (addpath_encode) | |
2811 | stream_putl(s, addpath_tx_id); | |
2812 | /* Label, RD, Prefix write. */ | |
2813 | stream_putc(s, p->prefixlen + 88); | |
2814 | stream_put(s, label, BGP_LABEL_BYTES); | |
2815 | stream_put(s, prd->val, 8); | |
2816 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2817 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2818 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
2819 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
2820 | addpath_encode, addpath_tx_id); | |
d62a17ae | 2821 | } else if (safi == SAFI_LABELED_UNICAST) { |
2822 | /* Prefix write with label. */ | |
2823 | stream_put_labeled_prefix(s, p, label); | |
7c40bf39 | 2824 | } else if (safi == SAFI_FLOWSPEC) { |
2825 | if (PSIZE (p->prefixlen)+2 < FLOWSPEC_NLRI_SIZELIMIT) | |
2826 | stream_putc(s, PSIZE (p->prefixlen)+2); | |
2827 | else | |
2828 | stream_putw(s, (PSIZE (p->prefixlen)+2)|(0xf<<12)); | |
2829 | stream_putc(s, 2);/* Filter type */ | |
2830 | stream_putc(s, p->prefixlen);/* Prefix length */ | |
2831 | stream_put(s, &p->u.prefix, PSIZE (p->prefixlen)); | |
d62a17ae | 2832 | } else |
2833 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2834 | } | |
2835 | ||
2836 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2837 | { | |
2838 | int size = PSIZE(p->prefixlen); | |
2839 | if (safi == SAFI_MPLS_VPN) | |
2840 | size += 88; | |
2841 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2842 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2843 | // type-5 | |
2844 | return size; | |
8c71e481 PM |
2845 | } |
2846 | ||
f4c89855 | 2847 | /* |
65efcfce | 2848 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 2849 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 2850 | * almost the same TLV format |
f4c89855 | 2851 | */ |
d62a17ae | 2852 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
2853 | struct stream *s, struct attr *attr, | |
2854 | uint8_t attrtype) | |
2855 | { | |
2856 | unsigned int attrlenfield = 0; | |
2857 | unsigned int attrhdrlen = 0; | |
2858 | struct bgp_attr_encap_subtlv *subtlvs; | |
2859 | struct bgp_attr_encap_subtlv *st; | |
2860 | const char *attrname; | |
2861 | ||
9d303b37 DL |
2862 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
2863 | && (!attr->encap_tunneltype | |
2864 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 2865 | return; |
2866 | ||
2867 | switch (attrtype) { | |
f4c89855 | 2868 | case BGP_ATTR_ENCAP: |
d62a17ae | 2869 | attrname = "Tunnel Encap"; |
2870 | subtlvs = attr->encap_subtlvs; | |
2871 | if (subtlvs == NULL) /* nothing to do */ | |
2872 | return; | |
2873 | /* | |
2874 | * The tunnel encap attr has an "outer" tlv. | |
2875 | * T = tunneltype, | |
2876 | * L = total length of subtlvs, | |
2877 | * V = concatenated subtlvs. | |
2878 | */ | |
2879 | attrlenfield = 2 + 2; /* T + L */ | |
2880 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
2881 | break; | |
f4c89855 | 2882 | |
65efcfce LB |
2883 | #if ENABLE_BGP_VNC |
2884 | case BGP_ATTR_VNC: | |
d62a17ae | 2885 | attrname = "VNC"; |
2886 | subtlvs = attr->vnc_subtlvs; | |
2887 | if (subtlvs == NULL) /* nothing to do */ | |
2888 | return; | |
2889 | attrlenfield = 0; /* no outer T + L */ | |
2890 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
2891 | break; | |
65efcfce LB |
2892 | #endif |
2893 | ||
f4c89855 | 2894 | default: |
d62a17ae | 2895 | assert(0); |
2896 | } | |
2897 | ||
2898 | /* compute attr length */ | |
2899 | for (st = subtlvs; st; st = st->next) { | |
2900 | attrlenfield += (attrhdrlen + st->length); | |
2901 | } | |
2902 | ||
2903 | if (attrlenfield > 0xffff) { | |
2904 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
2905 | attrname, attrlenfield); | |
2906 | return; | |
2907 | } | |
2908 | ||
2909 | if (attrlenfield > 0xff) { | |
2910 | /* 2-octet length field */ | |
996c9314 LB |
2911 | stream_putc(s, |
2912 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
2913 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 2914 | stream_putc(s, attrtype); |
2915 | stream_putw(s, attrlenfield & 0xffff); | |
2916 | } else { | |
2917 | /* 1-octet length field */ | |
2918 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
2919 | stream_putc(s, attrtype); | |
2920 | stream_putc(s, attrlenfield & 0xff); | |
2921 | } | |
2922 | ||
2923 | if (attrtype == BGP_ATTR_ENCAP) { | |
2924 | /* write outer T+L */ | |
2925 | stream_putw(s, attr->encap_tunneltype); | |
2926 | stream_putw(s, attrlenfield - 4); | |
2927 | } | |
2928 | ||
2929 | /* write each sub-tlv */ | |
2930 | for (st = subtlvs; st; st = st->next) { | |
2931 | if (attrtype == BGP_ATTR_ENCAP) { | |
2932 | stream_putc(s, st->type); | |
2933 | stream_putc(s, st->length); | |
65efcfce | 2934 | #if ENABLE_BGP_VNC |
d62a17ae | 2935 | } else { |
2936 | stream_putw(s, st->type); | |
2937 | stream_putw(s, st->length); | |
65efcfce | 2938 | #endif |
d62a17ae | 2939 | } |
2940 | stream_put(s, st->value, st->length); | |
2941 | } | |
f4c89855 | 2942 | } |
f4c89855 | 2943 | |
d62a17ae | 2944 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 2945 | { |
d62a17ae | 2946 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
2947 | the attr length */ | |
2948 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
2949 | } |
2950 | ||
718e3744 | 2951 | /* Make attribute packet. */ |
d62a17ae | 2952 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
2953 | struct stream *s, struct attr *attr, | |
2954 | struct bpacket_attr_vec_arr *vecarr, | |
2955 | struct prefix *p, afi_t afi, safi_t safi, | |
2956 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
2957 | mpls_label_t *label, uint32_t num_labels, |
2958 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 2959 | { |
2960 | size_t cp; | |
2961 | size_t aspath_sizep; | |
2962 | struct aspath *aspath; | |
2963 | int send_as4_path = 0; | |
2964 | int send_as4_aggregator = 0; | |
2965 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
2966 | ||
2967 | if (!bgp) | |
2968 | bgp = peer->bgp; | |
2969 | ||
2970 | /* Remember current pointer. */ | |
2971 | cp = stream_get_endp(s); | |
2972 | ||
2973 | if (p | |
2974 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
2975 | && !peer_cap_enhe(peer, afi, safi))) { | |
2976 | size_t mpattrlen_pos = 0; | |
2977 | ||
2978 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
2979 | vecarr, attr); | |
996c9314 LB |
2980 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
2981 | num_labels, addpath_encode, | |
2982 | addpath_tx_id, attr); | |
d62a17ae | 2983 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 2984 | } |
d62a17ae | 2985 | |
2986 | /* Origin attribute. */ | |
2987 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
2988 | stream_putc(s, BGP_ATTR_ORIGIN); | |
2989 | stream_putc(s, 1); | |
2990 | stream_putc(s, attr->origin); | |
2991 | ||
2992 | /* AS path attribute. */ | |
2993 | ||
2994 | /* If remote-peer is EBGP */ | |
2995 | if (peer->sort == BGP_PEER_EBGP | |
2996 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
2997 | PEER_FLAG_AS_PATH_UNCHANGED) | |
2998 | || attr->aspath->segments == NULL) | |
2999 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3000 | PEER_FLAG_RSERVER_CLIENT))) { | |
3001 | aspath = aspath_dup(attr->aspath); | |
3002 | ||
3003 | /* Even though we may not be configured for confederations we | |
3004 | * may have | |
3005 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3006 | aspath = aspath_delete_confed_seq(aspath); | |
3007 | ||
3008 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3009 | /* Stuff our path CONFED_ID on the front */ | |
3010 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3011 | } else { | |
3012 | if (peer->change_local_as) { | |
3013 | /* If replace-as is specified, we only use the | |
3014 | change_local_as when | |
3015 | advertising routes. */ | |
3016 | if (!CHECK_FLAG( | |
3017 | peer->flags, | |
3018 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) { | |
3019 | aspath = aspath_add_seq(aspath, | |
3020 | peer->local_as); | |
3021 | } | |
3022 | aspath = aspath_add_seq(aspath, | |
3023 | peer->change_local_as); | |
3024 | } else { | |
3025 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3026 | } | |
3027 | } | |
3028 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3029 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3030 | * thing */ | |
3031 | aspath = aspath_dup(attr->aspath); | |
3032 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3033 | } else | |
3034 | aspath = attr->aspath; | |
3035 | ||
3036 | /* If peer is not AS4 capable, then: | |
3037 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3038 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3039 | * segment | |
3040 | * types are in it (i.e. exclude them if they are there) | |
3041 | * AND do this only if there is at least one asnum > 65535 in the | |
3042 | * path! | |
3043 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3044 | * change | |
3045 | * all ASnums > 65535 to BGP_AS_TRANS | |
3046 | */ | |
3047 | ||
3048 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3049 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3050 | aspath_sizep = stream_get_endp(s); | |
3051 | stream_putw(s, 0); | |
3052 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3053 | ||
3054 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3055 | * in the path | |
3056 | */ | |
3057 | if (!use32bit && aspath_has_as4(aspath)) | |
3058 | send_as4_path = | |
3059 | 1; /* we'll do this later, at the correct place */ | |
3060 | ||
3061 | /* Nexthop attribute. */ | |
3062 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3063 | && !peer_cap_enhe(peer, afi, safi)) { | |
3064 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
3065 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3066 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3067 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3068 | attr); | |
3069 | stream_putc(s, 4); | |
3070 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3071 | } else if (peer_cap_enhe(from, afi, safi)) { | |
3072 | /* | |
3073 | * Likely this is the case when an IPv4 prefix was | |
3074 | * received with | |
3075 | * Extended Next-hop capability and now being advertised | |
3076 | * to | |
3077 | * non-ENHE peers. | |
3078 | * Setting the mandatory (ipv4) next-hop attribute here | |
3079 | * to enable | |
3080 | * implicit next-hop self with correct (ipv4 address | |
3081 | * family). | |
3082 | */ | |
3083 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3084 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3085 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3086 | NULL); | |
3087 | stream_putc(s, 4); | |
3088 | stream_put_ipv4(s, 0); | |
3089 | } | |
718e3744 | 3090 | } |
d62a17ae | 3091 | |
3092 | /* MED attribute. */ | |
3093 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3094 | || bgp->maxmed_active) { | |
3095 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3096 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3097 | stream_putc(s, 4); | |
3098 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3099 | : attr->med)); | |
3100 | } | |
3101 | ||
3102 | /* Local preference. */ | |
3103 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3104 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3105 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3106 | stream_putc(s, 4); | |
3107 | stream_putl(s, attr->local_pref); | |
3108 | } | |
3109 | ||
3110 | /* Atomic aggregate. */ | |
3111 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3112 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3113 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3114 | stream_putc(s, 0); | |
3115 | } | |
3116 | ||
3117 | /* Aggregator. */ | |
3118 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3119 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3120 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3121 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3122 | ||
3123 | if (use32bit) { | |
3124 | /* AS4 capable peer */ | |
3125 | stream_putc(s, 8); | |
3126 | stream_putl(s, attr->aggregator_as); | |
3127 | } else { | |
3128 | /* 2-byte AS peer */ | |
3129 | stream_putc(s, 6); | |
3130 | ||
3131 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3132 | * used? */ | |
3133 | if (attr->aggregator_as > 65535) { | |
3134 | stream_putw(s, BGP_AS_TRANS); | |
3135 | ||
3136 | /* we have to send AS4_AGGREGATOR, too. | |
3137 | * we'll do that later in order to send | |
3138 | * attributes in ascending | |
3139 | * order. | |
3140 | */ | |
3141 | send_as4_aggregator = 1; | |
3142 | } else | |
d7c0a89a | 3143 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 3144 | } |
3145 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3146 | } | |
3147 | ||
3148 | /* Community attribute. */ | |
3149 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3150 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3151 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3152 | stream_putc(s, |
3153 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3154 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3155 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3156 | stream_putw(s, attr->community->size * 4); | |
3157 | } else { | |
996c9314 LB |
3158 | stream_putc(s, |
3159 | BGP_ATTR_FLAG_OPTIONAL | |
3160 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3161 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3162 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3163 | } |
d62a17ae | 3164 | stream_put(s, attr->community->val, attr->community->size * 4); |
3165 | } | |
3166 | ||
3167 | /* | |
3168 | * Large Community attribute. | |
3169 | */ | |
3170 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3171 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3172 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3173 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3174 | stream_putc(s, |
3175 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3176 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3177 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3178 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3179 | } else { |
996c9314 LB |
3180 | stream_putc(s, |
3181 | BGP_ATTR_FLAG_OPTIONAL | |
3182 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3183 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3184 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3185 | } |
d62a17ae | 3186 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3187 | lcom_length(attr->lcommunity)); |
d62a17ae | 3188 | } |
4372df71 | 3189 | |
d62a17ae | 3190 | /* Route Reflector. */ |
3191 | if (peer->sort == BGP_PEER_IBGP && from | |
3192 | && from->sort == BGP_PEER_IBGP) { | |
3193 | /* Originator ID. */ | |
3194 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3195 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3196 | stream_putc(s, 4); | |
3197 | ||
3198 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3199 | stream_put_in_addr(s, &attr->originator_id); | |
3200 | else | |
3201 | stream_put_in_addr(s, &from->remote_id); | |
3202 | ||
3203 | /* Cluster list. */ | |
3204 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3205 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3206 | ||
3207 | if (attr->cluster) { | |
3208 | stream_putc(s, attr->cluster->length + 4); | |
3209 | /* If this peer configuration's parent BGP has | |
3210 | * cluster_id. */ | |
3211 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3212 | stream_put_in_addr(s, &bgp->cluster_id); | |
3213 | else | |
3214 | stream_put_in_addr(s, &bgp->router_id); | |
3215 | stream_put(s, attr->cluster->list, | |
3216 | attr->cluster->length); | |
3217 | } else { | |
3218 | stream_putc(s, 4); | |
3219 | /* If this peer configuration's parent BGP has | |
3220 | * cluster_id. */ | |
3221 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3222 | stream_put_in_addr(s, &bgp->cluster_id); | |
3223 | else | |
3224 | stream_put_in_addr(s, &bgp->router_id); | |
3225 | } | |
3226 | } | |
4372df71 | 3227 | |
d62a17ae | 3228 | /* Extended Communities attribute. */ |
3229 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3230 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3231 | if (peer->sort == BGP_PEER_IBGP | |
3232 | || peer->sort == BGP_PEER_CONFED) { | |
3233 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
3234 | stream_putc(s, |
3235 | BGP_ATTR_FLAG_OPTIONAL | |
3236 | | BGP_ATTR_FLAG_TRANS | |
3237 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3238 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3239 | stream_putw(s, attr->ecommunity->size * 8); | |
3240 | } else { | |
996c9314 LB |
3241 | stream_putc(s, |
3242 | BGP_ATTR_FLAG_OPTIONAL | |
3243 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3244 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3245 | stream_putc(s, attr->ecommunity->size * 8); | |
3246 | } | |
3247 | stream_put(s, attr->ecommunity->val, | |
3248 | attr->ecommunity->size * 8); | |
3249 | } else { | |
d7c0a89a | 3250 | uint8_t *pnt; |
d62a17ae | 3251 | int tbit; |
3252 | int ecom_tr_size = 0; | |
3253 | int i; | |
3254 | ||
3255 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3256 | pnt = attr->ecommunity->val + (i * 8); | |
3257 | tbit = *pnt; | |
3258 | ||
3259 | if (CHECK_FLAG(tbit, | |
3260 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3261 | continue; | |
3262 | ||
3263 | ecom_tr_size++; | |
3264 | } | |
3265 | ||
3266 | if (ecom_tr_size) { | |
3267 | if (ecom_tr_size * 8 > 255) { | |
3268 | stream_putc( | |
3269 | s, | |
3270 | BGP_ATTR_FLAG_OPTIONAL | |
3271 | | BGP_ATTR_FLAG_TRANS | |
3272 | | BGP_ATTR_FLAG_EXTLEN); | |
3273 | stream_putc(s, | |
3274 | BGP_ATTR_EXT_COMMUNITIES); | |
3275 | stream_putw(s, ecom_tr_size * 8); | |
3276 | } else { | |
3277 | stream_putc( | |
3278 | s, | |
3279 | BGP_ATTR_FLAG_OPTIONAL | |
3280 | | BGP_ATTR_FLAG_TRANS); | |
3281 | stream_putc(s, | |
3282 | BGP_ATTR_EXT_COMMUNITIES); | |
3283 | stream_putc(s, ecom_tr_size * 8); | |
3284 | } | |
3285 | ||
3286 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3287 | pnt = attr->ecommunity->val + (i * 8); | |
3288 | tbit = *pnt; | |
3289 | ||
3290 | if (CHECK_FLAG( | |
3291 | tbit, | |
3292 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3293 | continue; | |
3294 | ||
3295 | stream_put(s, pnt, 8); | |
3296 | } | |
3297 | } | |
3298 | } | |
3299 | } | |
4372df71 | 3300 | |
d62a17ae | 3301 | /* Label index attribute. */ |
3302 | if (safi == SAFI_LABELED_UNICAST) { | |
3303 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 3304 | uint32_t label_index; |
d62a17ae | 3305 | |
3306 | label_index = attr->label_index; | |
3307 | ||
3308 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3309 | stream_putc(s, |
3310 | BGP_ATTR_FLAG_OPTIONAL | |
3311 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3312 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3313 | stream_putc(s, 10); | |
3314 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3315 | stream_putw(s, | |
3316 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3317 | stream_putc(s, 0); // reserved | |
3318 | stream_putw(s, 0); // flags | |
3319 | stream_putl(s, label_index); | |
3320 | } | |
4372df71 | 3321 | } |
d62a17ae | 3322 | } |
3323 | ||
3324 | if (send_as4_path) { | |
3325 | /* If the peer is NOT As4 capable, AND */ | |
3326 | /* there are ASnums > 65535 in path THEN | |
3327 | * give out AS4_PATH */ | |
3328 | ||
3329 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3330 | * path segments! | |
3331 | * Hm, I wonder... confederation things *should* only be at | |
3332 | * the beginning of an aspath, right? Then we should use | |
3333 | * aspath_delete_confed_seq for this, because it is already | |
3334 | * there! (JK) | |
3335 | * Folks, talk to me: what is reasonable here!? | |
3336 | */ | |
3337 | aspath = aspath_delete_confed_seq(aspath); | |
3338 | ||
996c9314 LB |
3339 | stream_putc(s, |
3340 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3341 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3342 | stream_putc(s, BGP_ATTR_AS4_PATH); |
3343 | aspath_sizep = stream_get_endp(s); | |
3344 | stream_putw(s, 0); | |
3345 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3346 | } | |
3347 | ||
3348 | if (aspath != attr->aspath) | |
3349 | aspath_free(aspath); | |
3350 | ||
3351 | if (send_as4_aggregator) { | |
3352 | /* send AS4_AGGREGATOR, at this place */ | |
3353 | /* this section of code moved here in order to ensure the | |
3354 | * correct | |
3355 | * *ascending* order of attributes | |
3356 | */ | |
3357 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3358 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3359 | stream_putc(s, 8); | |
3360 | stream_putl(s, attr->aggregator_as); | |
3361 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3362 | } | |
3363 | ||
3364 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3365 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3366 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3367 | /* Tunnel Encap attribute */ | |
3368 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce LB |
3369 | |
3370 | #if ENABLE_BGP_VNC | |
d62a17ae | 3371 | /* VNC attribute */ |
3372 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 3373 | #endif |
d62a17ae | 3374 | } |
587ff0fd | 3375 | |
a21bd7a3 DW |
3376 | /* PMSI Tunnel */ |
3377 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
3378 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3379 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
3380 | stream_putc(s, 9); // Length | |
3381 | stream_putc(s, 0); // Flags | |
7fd077aa | 3382 | stream_putc(s, PMSI_TNLTYPE_INGR_REPL); // IR (6) |
996c9314 LB |
3383 | stream_put(s, &(attr->label), |
3384 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
3385 | stream_put_ipv4(s, attr->nexthop.s_addr); |
3386 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
3387 | } |
3388 | ||
d62a17ae | 3389 | /* Unknown transit attribute. */ |
3390 | if (attr->transit) | |
3391 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 3392 | |
d62a17ae | 3393 | /* Return total size of attribute. */ |
3394 | return stream_get_endp(s) - cp; | |
718e3744 | 3395 | } |
3396 | ||
d62a17ae | 3397 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 3398 | { |
d62a17ae | 3399 | unsigned long attrlen_pnt; |
3400 | iana_afi_t pkt_afi; | |
5c525538 | 3401 | iana_safi_t pkt_safi; |
718e3744 | 3402 | |
d62a17ae | 3403 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3404 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3405 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 3406 | |
d62a17ae | 3407 | attrlen_pnt = stream_get_endp(s); |
3408 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 3409 | |
d62a17ae | 3410 | /* Convert AFI, SAFI to values for packet. */ |
3411 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 3412 | |
d62a17ae | 3413 | stream_putw(s, pkt_afi); |
3414 | stream_putc(s, pkt_safi); | |
9cabb64b | 3415 | |
d62a17ae | 3416 | return attrlen_pnt; |
8c71e481 | 3417 | } |
718e3744 | 3418 | |
d62a17ae | 3419 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, |
3420 | safi_t safi, struct prefix_rd *prd, | |
d7c0a89a QY |
3421 | mpls_label_t *label, uint32_t num_labels, |
3422 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 3423 | struct attr *attr) |
8c71e481 | 3424 | { |
d7c0a89a | 3425 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 3426 | |
b57ba6d2 | 3427 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 3428 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
3429 | num_labels = 1; |
3430 | } | |
cd1964ff | 3431 | |
996c9314 | 3432 | return bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
d62a17ae | 3433 | addpath_encode, addpath_tx_id, attr); |
8c71e481 | 3434 | } |
718e3744 | 3435 | |
d62a17ae | 3436 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 3437 | { |
d62a17ae | 3438 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 3439 | } |
3440 | ||
3441 | /* Initialization of attribute. */ | |
d62a17ae | 3442 | void bgp_attr_init(void) |
718e3744 | 3443 | { |
d62a17ae | 3444 | aspath_init(); |
3445 | attrhash_init(); | |
3446 | community_init(); | |
3447 | ecommunity_init(); | |
3448 | lcommunity_init(); | |
3449 | cluster_init(); | |
3450 | transit_init(); | |
3451 | encap_init(); | |
718e3744 | 3452 | } |
3453 | ||
d62a17ae | 3454 | void bgp_attr_finish(void) |
228da428 | 3455 | { |
d62a17ae | 3456 | aspath_finish(); |
3457 | attrhash_finish(); | |
3458 | community_finish(); | |
3459 | ecommunity_finish(); | |
3460 | lcommunity_finish(); | |
3461 | cluster_finish(); | |
3462 | transit_finish(); | |
3463 | encap_finish(); | |
228da428 CC |
3464 | } |
3465 | ||
718e3744 | 3466 | /* Make attribute packet. */ |
d62a17ae | 3467 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
3468 | struct prefix *prefix) | |
3469 | { | |
3470 | unsigned long cp; | |
3471 | unsigned long len; | |
3472 | size_t aspath_lenp; | |
3473 | struct aspath *aspath; | |
3474 | int addpath_encode = 0; | |
d7c0a89a | 3475 | uint32_t addpath_tx_id = 0; |
d62a17ae | 3476 | |
3477 | /* Remember current pointer. */ | |
3478 | cp = stream_get_endp(s); | |
3479 | ||
3480 | /* Place holder of length. */ | |
3481 | stream_putw(s, 0); | |
3482 | ||
3483 | /* Origin attribute. */ | |
3484 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3485 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3486 | stream_putc(s, 1); | |
3487 | stream_putc(s, attr->origin); | |
3488 | ||
3489 | aspath = attr->aspath; | |
3490 | ||
3491 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3492 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3493 | aspath_lenp = stream_get_endp(s); | |
3494 | stream_putw(s, 0); | |
3495 | ||
3496 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3497 | ||
3498 | /* Nexthop attribute. */ | |
3499 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3500 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3501 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3502 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3503 | stream_putc(s, 4); | |
3504 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 3505 | } |
d62a17ae | 3506 | |
3507 | /* MED attribute. */ | |
3508 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3509 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3510 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3511 | stream_putc(s, 4); | |
3512 | stream_putl(s, attr->med); | |
3513 | } | |
3514 | ||
3515 | /* Local preference. */ | |
3516 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3517 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3518 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3519 | stream_putc(s, 4); | |
3520 | stream_putl(s, attr->local_pref); | |
3521 | } | |
3522 | ||
3523 | /* Atomic aggregate. */ | |
3524 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3525 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3526 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3527 | stream_putc(s, 0); | |
3528 | } | |
3529 | ||
3530 | /* Aggregator. */ | |
3531 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3532 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3533 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3534 | stream_putc(s, 8); | |
3535 | stream_putl(s, attr->aggregator_as); | |
3536 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3537 | } | |
3538 | ||
3539 | /* Community attribute. */ | |
3540 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3541 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3542 | stream_putc(s, |
3543 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3544 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3545 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3546 | stream_putw(s, attr->community->size * 4); | |
3547 | } else { | |
996c9314 LB |
3548 | stream_putc(s, |
3549 | BGP_ATTR_FLAG_OPTIONAL | |
3550 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3551 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3552 | stream_putc(s, attr->community->size * 4); | |
3553 | } | |
3554 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3555 | } | |
3556 | ||
3557 | /* Large Community attribute. */ | |
3558 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 3559 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3560 | stream_putc(s, |
3561 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3562 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3563 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3564 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3565 | } else { |
996c9314 LB |
3566 | stream_putc(s, |
3567 | BGP_ATTR_FLAG_OPTIONAL | |
3568 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3569 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3570 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3571 | } |
3572 | ||
996c9314 LB |
3573 | stream_put(s, attr->lcommunity->val, |
3574 | lcom_length(attr->lcommunity)); | |
d62a17ae | 3575 | } |
3576 | ||
3577 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3578 | if (prefix != NULL && prefix->family == AF_INET6 | |
3579 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3580 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3581 | int sizep; | |
3582 | ||
3583 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3584 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3585 | sizep = stream_get_endp(s); | |
3586 | ||
3587 | /* MP header */ | |
3588 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3589 | stream_putw(s, AFI_IP6); /* AFI */ | |
3590 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3591 | ||
3592 | /* Next hop */ | |
3593 | stream_putc(s, attr->mp_nexthop_len); | |
3594 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3595 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3596 | stream_put(s, &attr->mp_nexthop_local, | |
3597 | IPV6_MAX_BYTELEN); | |
3598 | ||
3599 | /* SNPA */ | |
3600 | stream_putc(s, 0); | |
3601 | ||
3602 | /* Prefix */ | |
3603 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3604 | addpath_tx_id); | |
3605 | ||
3606 | /* Set MP attribute length. */ | |
3607 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3608 | } | |
3609 | ||
3610 | /* Prefix SID */ | |
3611 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3612 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3613 | stream_putc(s, |
3614 | BGP_ATTR_FLAG_OPTIONAL | |
3615 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3616 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3617 | stream_putc(s, 10); | |
3618 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3619 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3620 | stream_putc(s, 0); // reserved | |
3621 | stream_putw(s, 0); // flags | |
3622 | stream_putl(s, attr->label_index); | |
3623 | } | |
3624 | } | |
3625 | ||
3626 | /* Return total size of attribute. */ | |
3627 | len = stream_get_endp(s) - cp - 2; | |
3628 | stream_putw_at(s, cp, len); | |
718e3744 | 3629 | } |