]>
Commit | Line | Data |
---|---|---|
718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
e496b420 | 35 | #include "srv6.h" |
a5c6a9b1 | 36 | #include "frrstr.h" |
718e3744 | 37 | |
38 | #include "bgpd/bgpd.h" | |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_route.h" | |
41 | #include "bgpd/bgp_aspath.h" | |
42 | #include "bgpd/bgp_community.h" | |
43 | #include "bgpd/bgp_debug.h" | |
14454c9f | 44 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 45 | #include "bgpd/bgp_label.h" |
718e3744 | 46 | #include "bgpd/bgp_packet.h" |
47 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 48 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 49 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 50 | #include "bgpd/bgp_encap_types.h" |
1e20238a | 51 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 52 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
53 | #include "bgp_encap_types.h" | |
54 | #include "bgp_vnc_types.h" | |
65efcfce | 55 | #endif |
b18825eb | 56 | #include "bgp_evpn.h" |
7c40bf39 | 57 | #include "bgp_flowspec_private.h" |
eee353c5 | 58 | #include "bgp_mac.h" |
6b0655a2 | 59 | |
718e3744 | 60 | /* Attribute strings for logging. */ |
d62a17ae | 61 | static const struct message attr_str[] = { |
62 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
63 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
64 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
65 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
66 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
67 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
68 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
69 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
70 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
71 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
d62a17ae | 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"}, | |
a21bd7a3 | 77 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 78 | {BGP_ATTR_ENCAP, "ENCAP"}, |
d864dd9e | 79 | {BGP_ATTR_OTC, "OTC"}, |
1e20238a | 80 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 81 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 82 | #endif |
d62a17ae | 83 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
84 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
9a659715 | 85 | {BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"}, |
97a52c82 | 86 | {BGP_ATTR_AIGP, "AIGP"}, |
d62a17ae | 87 | {0}}; |
afcb7679 | 88 | |
996c9314 LB |
89 | static const struct message attr_flag_str[] = { |
90 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
91 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
92 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
93 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
94 | this list */ | |
95 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
96 | {0}}; | |
6b0655a2 | 97 | |
9bddac4b | 98 | static struct hash *cluster_hash; |
718e3744 | 99 | |
d62a17ae | 100 | static void *cluster_hash_alloc(void *p) |
718e3744 | 101 | { |
d62a17ae | 102 | const struct cluster_list *val = (const struct cluster_list *)p; |
103 | struct cluster_list *cluster; | |
718e3744 | 104 | |
d62a17ae | 105 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
106 | cluster->length = val->length; | |
718e3744 | 107 | |
d62a17ae | 108 | if (cluster->length) { |
109 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
110 | memcpy(cluster->list, val->list, val->length); | |
111 | } else | |
112 | cluster->list = NULL; | |
718e3744 | 113 | |
d62a17ae | 114 | cluster->refcnt = 0; |
718e3744 | 115 | |
d62a17ae | 116 | return cluster; |
718e3744 | 117 | } |
118 | ||
119 | /* Cluster list related functions. */ | |
d62a17ae | 120 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 121 | { |
628565c7 | 122 | struct cluster_list tmp = {}; |
d62a17ae | 123 | struct cluster_list *cluster; |
718e3744 | 124 | |
d62a17ae | 125 | tmp.length = length; |
628565c7 | 126 | tmp.list = length == 0 ? NULL : pnt; |
718e3744 | 127 | |
d62a17ae | 128 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
129 | cluster->refcnt++; | |
130 | return cluster; | |
718e3744 | 131 | } |
132 | ||
3dc339cd | 133 | bool cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 134 | { |
d62a17ae | 135 | int i; |
136 | ||
137 | for (i = 0; i < cluster->length / 4; i++) | |
138 | if (cluster->list[i].s_addr == originator.s_addr) | |
3dc339cd DA |
139 | return true; |
140 | return false; | |
718e3744 | 141 | } |
142 | ||
d8b87afe | 143 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 144 | { |
d62a17ae | 145 | const struct cluster_list *cluster = p; |
718e3744 | 146 | |
d62a17ae | 147 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 148 | } |
149 | ||
74df8d6d | 150 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 151 | { |
d62a17ae | 152 | const struct cluster_list *cluster1 = p1; |
153 | const struct cluster_list *cluster2 = p2; | |
923de654 | 154 | |
f22ed884 QY |
155 | if (cluster1->list == cluster2->list) |
156 | return true; | |
157 | ||
158 | if (!cluster1->list || !cluster2->list) | |
159 | return false; | |
160 | ||
161 | if (cluster1->length != cluster2->length) | |
162 | return false; | |
163 | ||
164 | return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 165 | } |
166 | ||
d62a17ae | 167 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 168 | { |
0a22ddfb | 169 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 170 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 171 | } |
172 | ||
d62a17ae | 173 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 174 | { |
d62a17ae | 175 | struct cluster_list *find; |
718e3744 | 176 | |
d62a17ae | 177 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
178 | find->refcnt++; | |
718e3744 | 179 | |
d62a17ae | 180 | return find; |
718e3744 | 181 | } |
182 | ||
628565c7 | 183 | static void cluster_unintern(struct cluster_list **cluster) |
718e3744 | 184 | { |
628565c7 QY |
185 | if ((*cluster)->refcnt) |
186 | (*cluster)->refcnt--; | |
187 | ||
188 | if ((*cluster)->refcnt == 0) { | |
189 | void *p = hash_release(cluster_hash, *cluster); | |
190 | assert(p == *cluster); | |
191 | cluster_free(*cluster); | |
192 | *cluster = NULL; | |
d62a17ae | 193 | } |
718e3744 | 194 | } |
195 | ||
d62a17ae | 196 | static void cluster_init(void) |
718e3744 | 197 | { |
996c9314 | 198 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 199 | "BGP Cluster"); |
718e3744 | 200 | } |
228da428 | 201 | |
d62a17ae | 202 | static void cluster_finish(void) |
228da428 | 203 | { |
d62a17ae | 204 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
205 | hash_free(cluster_hash); | |
206 | cluster_hash = NULL; | |
228da428 | 207 | } |
6b0655a2 | 208 | |
bede7744 | 209 | static struct hash *encap_hash = NULL; |
1e20238a | 210 | #ifdef ENABLE_BGP_VNC |
bede7744 LB |
211 | static struct hash *vnc_hash = NULL; |
212 | #endif | |
e496b420 HS |
213 | static struct hash *srv6_l3vpn_hash; |
214 | static struct hash *srv6_vpn_hash; | |
bede7744 | 215 | |
d62a17ae | 216 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 217 | { |
d62a17ae | 218 | struct bgp_attr_encap_subtlv *new; |
219 | struct bgp_attr_encap_subtlv *tail; | |
220 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 221 | |
d62a17ae | 222 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 223 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 224 | if (tail) { |
225 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
226 | tail = tail->next; | |
227 | } else { | |
228 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
229 | } | |
230 | assert(tail); | |
231 | memcpy(tail, p, size); | |
232 | tail->next = NULL; | |
f4c89855 | 233 | } |
f4c89855 | 234 | |
d62a17ae | 235 | return new; |
f4c89855 LB |
236 | } |
237 | ||
d62a17ae | 238 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 239 | { |
d62a17ae | 240 | struct bgp_attr_encap_subtlv *next; |
241 | while (p) { | |
242 | next = p->next; | |
243 | p->next = NULL; | |
244 | XFREE(MTYPE_ENCAP_TLV, p); | |
245 | p = next; | |
246 | } | |
f4c89855 LB |
247 | } |
248 | ||
d62a17ae | 249 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 250 | { |
d62a17ae | 251 | if (!attr) |
252 | return; | |
f4c89855 | 253 | |
d62a17ae | 254 | if (attr->encap_subtlvs) { |
255 | encap_free(attr->encap_subtlvs); | |
256 | attr->encap_subtlvs = NULL; | |
257 | } | |
1e20238a | 258 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
259 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
260 | bgp_attr_get_vnc_subtlvs(attr); | |
261 | ||
262 | if (vnc_subtlvs) { | |
263 | encap_free(vnc_subtlvs); | |
264 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 265 | } |
65efcfce | 266 | #endif |
f4c89855 LB |
267 | } |
268 | ||
269 | /* | |
270 | * Compare encap sub-tlv chains | |
271 | * | |
272 | * 1 = equivalent | |
273 | * 0 = not equivalent | |
274 | * | |
275 | * This algorithm could be made faster if needed | |
276 | */ | |
3dc339cd DA |
277 | static bool encap_same(const struct bgp_attr_encap_subtlv *h1, |
278 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 279 | { |
36de6e0e A |
280 | const struct bgp_attr_encap_subtlv *p; |
281 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 282 | |
d62a17ae | 283 | if (h1 == h2) |
3dc339cd | 284 | return true; |
d62a17ae | 285 | if (h1 == NULL || h2 == NULL) |
3dc339cd | 286 | return false; |
f4c89855 | 287 | |
d62a17ae | 288 | for (p = h1; p; p = p->next) { |
289 | for (q = h2; q; q = q->next) { | |
290 | if ((p->type == q->type) && (p->length == q->length) | |
291 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 292 | |
d62a17ae | 293 | break; |
294 | } | |
295 | } | |
296 | if (!q) | |
3dc339cd | 297 | return false; |
f4c89855 | 298 | } |
f4c89855 | 299 | |
d62a17ae | 300 | for (p = h2; p; p = p->next) { |
301 | for (q = h1; q; q = q->next) { | |
302 | if ((p->type == q->type) && (p->length == q->length) | |
303 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 304 | |
d62a17ae | 305 | break; |
306 | } | |
307 | } | |
308 | if (!q) | |
3dc339cd | 309 | return false; |
f4c89855 | 310 | } |
f4c89855 | 311 | |
3dc339cd | 312 | return true; |
f4c89855 LB |
313 | } |
314 | ||
d62a17ae | 315 | static void *encap_hash_alloc(void *p) |
bede7744 | 316 | { |
d62a17ae | 317 | /* Encap structure is already allocated. */ |
318 | return p; | |
bede7744 LB |
319 | } |
320 | ||
d62a17ae | 321 | typedef enum { |
322 | ENCAP_SUBTLV_TYPE, | |
1e20238a | 323 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 324 | VNC_SUBTLV_TYPE |
bede7744 LB |
325 | #endif |
326 | } encap_subtlv_type; | |
327 | ||
328 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 329 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 330 | { |
d62a17ae | 331 | struct bgp_attr_encap_subtlv *find; |
332 | struct hash *hash = encap_hash; | |
1e20238a | 333 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 334 | if (type == VNC_SUBTLV_TYPE) |
335 | hash = vnc_hash; | |
bede7744 LB |
336 | #endif |
337 | ||
d62a17ae | 338 | find = hash_get(hash, encap, encap_hash_alloc); |
339 | if (find != encap) | |
340 | encap_free(encap); | |
341 | find->refcnt++; | |
bede7744 | 342 | |
d62a17ae | 343 | return find; |
bede7744 LB |
344 | } |
345 | ||
d62a17ae | 346 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
347 | encap_subtlv_type type) | |
bede7744 | 348 | { |
d62a17ae | 349 | struct bgp_attr_encap_subtlv *encap = *encapp; |
350 | if (encap->refcnt) | |
351 | encap->refcnt--; | |
bede7744 | 352 | |
d62a17ae | 353 | if (encap->refcnt == 0) { |
354 | struct hash *hash = encap_hash; | |
1e20238a | 355 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 356 | if (type == VNC_SUBTLV_TYPE) |
357 | hash = vnc_hash; | |
bede7744 | 358 | #endif |
d62a17ae | 359 | hash_release(hash, encap); |
360 | encap_free(encap); | |
361 | *encapp = NULL; | |
362 | } | |
bede7744 LB |
363 | } |
364 | ||
d8b87afe | 365 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 366 | { |
d62a17ae | 367 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 368 | |
d62a17ae | 369 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
370 | } |
371 | ||
74df8d6d | 372 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 373 | { |
36de6e0e A |
374 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
375 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
376 | } |
377 | ||
d62a17ae | 378 | static void encap_init(void) |
bede7744 | 379 | { |
996c9314 | 380 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 381 | "BGP Encap Hash"); |
1e20238a | 382 | #ifdef ENABLE_BGP_VNC |
996c9314 | 383 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 384 | "BGP VNC Hash"); |
bede7744 LB |
385 | #endif |
386 | } | |
387 | ||
d62a17ae | 388 | static void encap_finish(void) |
bede7744 | 389 | { |
d62a17ae | 390 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
391 | hash_free(encap_hash); | |
392 | encap_hash = NULL; | |
1e20238a | 393 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 394 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
395 | hash_free(vnc_hash); | |
396 | vnc_hash = NULL; | |
bede7744 LB |
397 | #endif |
398 | } | |
399 | ||
d62a17ae | 400 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 401 | { |
d62a17ae | 402 | if (!a1 && a2) |
403 | return false; | |
404 | if (!a2 && a1) | |
405 | return false; | |
406 | if (!a1 && !a2) | |
407 | return true; | |
6c924775 | 408 | |
761cc919 IS |
409 | return bgp_route_evpn_same(bgp_attr_get_evpn_overlay(a1), |
410 | bgp_attr_get_evpn_overlay(a2)); | |
684a7227 PG |
411 | } |
412 | ||
718e3744 | 413 | /* Unknown transit attribute. */ |
9bddac4b | 414 | static struct hash *transit_hash; |
718e3744 | 415 | |
d62a17ae | 416 | static void transit_free(struct transit *transit) |
718e3744 | 417 | { |
0a22ddfb | 418 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 419 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 420 | } |
421 | ||
d62a17ae | 422 | static void *transit_hash_alloc(void *p) |
718e3744 | 423 | { |
d62a17ae | 424 | /* Transit structure is already allocated. */ |
425 | return p; | |
718e3744 | 426 | } |
427 | ||
d62a17ae | 428 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 429 | { |
d62a17ae | 430 | struct transit *find; |
718e3744 | 431 | |
d62a17ae | 432 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
433 | if (find != transit) | |
434 | transit_free(transit); | |
435 | find->refcnt++; | |
718e3744 | 436 | |
d62a17ae | 437 | return find; |
718e3744 | 438 | } |
439 | ||
547357c4 | 440 | static void transit_unintern(struct transit **transit) |
718e3744 | 441 | { |
547357c4 QY |
442 | if ((*transit)->refcnt) |
443 | (*transit)->refcnt--; | |
718e3744 | 444 | |
547357c4 QY |
445 | if ((*transit)->refcnt == 0) { |
446 | hash_release(transit_hash, *transit); | |
447 | transit_free(*transit); | |
448 | *transit = NULL; | |
d62a17ae | 449 | } |
718e3744 | 450 | } |
451 | ||
97a52c82 DA |
452 | static bool bgp_attr_aigp_get_tlv_metric(uint8_t *pnt, int length, |
453 | uint64_t *aigp) | |
454 | { | |
455 | uint8_t *data = pnt; | |
456 | uint8_t tlv_type; | |
457 | uint16_t tlv_length; | |
458 | ||
459 | while (length) { | |
460 | tlv_type = *data; | |
461 | ptr_get_be16(data + 1, &tlv_length); | |
462 | (void)data; | |
463 | ||
464 | /* The value field of the AIGP TLV is always 8 octets | |
465 | * long and its value is interpreted as an unsigned 64-bit | |
466 | * integer. | |
467 | */ | |
468 | if (tlv_type == BGP_AIGP_TLV_METRIC) { | |
469 | (void)ptr_get_be64(data + 3, aigp); | |
470 | ||
471 | /* If an AIGP attribute is received and its first AIGP | |
472 | * TLV contains the maximum value 0xffffffffffffffff, | |
473 | * the attribute SHOULD be considered to be malformed | |
474 | * and SHOULD be discarded as specified in this section. | |
475 | */ | |
476 | if (*aigp == BGP_AIGP_TLV_METRIC_MAX) { | |
477 | zlog_err("Bad AIGP TLV (%s) length: %llu", | |
478 | BGP_AIGP_TLV_METRIC_DESC, | |
479 | BGP_AIGP_TLV_METRIC_MAX); | |
480 | return false; | |
481 | } | |
482 | ||
483 | return true; | |
484 | } | |
485 | ||
486 | data += tlv_length; | |
487 | length -= tlv_length; | |
488 | } | |
489 | ||
490 | return false; | |
491 | } | |
492 | ||
493 | static uint64_t bgp_aigp_metric_total(struct bgp_path_info *bpi) | |
494 | { | |
495 | uint64_t aigp = bgp_attr_get_aigp_metric(bpi->attr); | |
496 | ||
497 | if (bpi->nexthop) | |
498 | return aigp + bpi->nexthop->metric; | |
499 | else | |
500 | return aigp; | |
501 | } | |
502 | ||
503 | static void stream_put_bgp_aigp_tlv_metric(struct stream *s, | |
504 | struct bgp_path_info *bpi) | |
505 | { | |
506 | stream_putc(s, BGP_AIGP_TLV_METRIC); | |
507 | stream_putw(s, BGP_AIGP_TLV_METRIC_LEN); | |
508 | stream_putq(s, bgp_aigp_metric_total(bpi)); | |
509 | } | |
510 | ||
511 | static bool bgp_attr_aigp_valid(uint8_t *pnt, int length) | |
512 | { | |
513 | uint8_t *data = pnt; | |
514 | uint8_t tlv_type; | |
515 | uint16_t tlv_length; | |
516 | ||
517 | if (length < 3) { | |
518 | zlog_err("Bad AIGP attribute length (MUST be minimum 3): %u", | |
519 | length); | |
520 | return false; | |
521 | } | |
522 | ||
523 | while (length) { | |
524 | tlv_type = *data; | |
525 | ptr_get_be16(data + 1, &tlv_length); | |
526 | (void)data; | |
527 | ||
528 | if (length < tlv_length) { | |
529 | zlog_err( | |
530 | "Bad AIGP attribute length: %u, but TLV length: %u", | |
531 | length, tlv_length); | |
532 | return false; | |
533 | } | |
534 | ||
535 | if (tlv_length < 3) { | |
536 | zlog_err("Bad AIGP TLV length (MUST be minimum 3): %u", | |
537 | tlv_length); | |
538 | return false; | |
539 | } | |
540 | ||
541 | /* AIGP TLV, Length: 11 */ | |
542 | if (tlv_type == BGP_AIGP_TLV_METRIC && | |
543 | tlv_length != BGP_AIGP_TLV_METRIC_LEN) { | |
544 | zlog_err("Bad AIGP TLV (%s) length: %u", | |
545 | BGP_AIGP_TLV_METRIC_DESC, tlv_length); | |
546 | return false; | |
547 | } | |
548 | ||
549 | data += tlv_length; | |
550 | length -= tlv_length; | |
551 | } | |
552 | ||
553 | return true; | |
554 | } | |
555 | ||
e496b420 HS |
556 | static void *srv6_l3vpn_hash_alloc(void *p) |
557 | { | |
558 | return p; | |
559 | } | |
560 | ||
561 | static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn) | |
562 | { | |
563 | XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn); | |
564 | } | |
565 | ||
566 | static struct bgp_attr_srv6_l3vpn * | |
567 | srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn) | |
568 | { | |
569 | struct bgp_attr_srv6_l3vpn *find; | |
570 | ||
571 | find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc); | |
572 | if (find != l3vpn) | |
573 | srv6_l3vpn_free(l3vpn); | |
574 | find->refcnt++; | |
575 | return find; | |
576 | } | |
577 | ||
578 | static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp) | |
579 | { | |
580 | struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp; | |
581 | ||
582 | if (l3vpn->refcnt) | |
583 | l3vpn->refcnt--; | |
584 | ||
585 | if (l3vpn->refcnt == 0) { | |
586 | hash_release(srv6_l3vpn_hash, l3vpn); | |
587 | srv6_l3vpn_free(l3vpn); | |
588 | *l3vpnp = NULL; | |
589 | } | |
590 | } | |
591 | ||
592 | static void *srv6_vpn_hash_alloc(void *p) | |
593 | { | |
594 | return p; | |
595 | } | |
596 | ||
597 | static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn) | |
598 | { | |
599 | XFREE(MTYPE_BGP_SRV6_VPN, vpn); | |
600 | } | |
601 | ||
602 | static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn) | |
603 | { | |
604 | struct bgp_attr_srv6_vpn *find; | |
605 | ||
606 | find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc); | |
607 | if (find != vpn) | |
608 | srv6_vpn_free(vpn); | |
609 | find->refcnt++; | |
610 | return find; | |
611 | } | |
612 | ||
613 | static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp) | |
614 | { | |
615 | struct bgp_attr_srv6_vpn *vpn = *vpnp; | |
616 | ||
617 | if (vpn->refcnt) | |
618 | vpn->refcnt--; | |
619 | ||
620 | if (vpn->refcnt == 0) { | |
621 | hash_release(srv6_vpn_hash, vpn); | |
622 | srv6_vpn_free(vpn); | |
623 | *vpnp = NULL; | |
624 | } | |
625 | } | |
626 | ||
627 | static uint32_t srv6_l3vpn_hash_key_make(const void *p) | |
628 | { | |
629 | const struct bgp_attr_srv6_l3vpn *l3vpn = p; | |
630 | uint32_t key = 0; | |
631 | ||
632 | key = jhash(&l3vpn->sid, 16, key); | |
633 | key = jhash_1word(l3vpn->sid_flags, key); | |
634 | key = jhash_1word(l3vpn->endpoint_behavior, key); | |
9299fd00 RS |
635 | key = jhash_1word(l3vpn->loc_block_len, key); |
636 | key = jhash_1word(l3vpn->loc_node_len, key); | |
637 | key = jhash_1word(l3vpn->func_len, key); | |
638 | key = jhash_1word(l3vpn->arg_len, key); | |
639 | key = jhash_1word(l3vpn->transposition_len, key); | |
640 | key = jhash_1word(l3vpn->transposition_offset, key); | |
e496b420 HS |
641 | return key; |
642 | } | |
643 | ||
644 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
645 | { | |
646 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
647 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
648 | ||
649 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
650 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
9299fd00 RS |
651 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior |
652 | && l3vpn1->loc_block_len == l3vpn2->loc_block_len | |
653 | && l3vpn1->loc_node_len == l3vpn2->loc_node_len | |
654 | && l3vpn1->func_len == l3vpn2->func_len | |
655 | && l3vpn1->arg_len == l3vpn2->arg_len | |
656 | && l3vpn1->transposition_len == l3vpn2->transposition_len | |
657 | && l3vpn1->transposition_offset == l3vpn2->transposition_offset; | |
e496b420 HS |
658 | } |
659 | ||
660 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
661 | const struct bgp_attr_srv6_l3vpn *h2) | |
662 | { | |
663 | if (h1 == h2) | |
664 | return true; | |
665 | else if (h1 == NULL || h2 == NULL) | |
666 | return false; | |
667 | else | |
668 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
669 | } | |
670 | ||
671 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
672 | { | |
673 | const struct bgp_attr_srv6_vpn *vpn = p; | |
674 | uint32_t key = 0; | |
675 | ||
676 | key = jhash(&vpn->sid, 16, key); | |
677 | key = jhash_1word(vpn->sid_flags, key); | |
678 | return key; | |
679 | } | |
680 | ||
681 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
682 | { | |
683 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
684 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
685 | ||
686 | return sid_same(&vpn1->sid, &vpn2->sid) | |
687 | && vpn1->sid_flags == vpn2->sid_flags; | |
688 | } | |
689 | ||
690 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
691 | const struct bgp_attr_srv6_vpn *h2) | |
692 | { | |
693 | if (h1 == h2) | |
694 | return true; | |
695 | else if (h1 == NULL || h2 == NULL) | |
696 | return false; | |
697 | else | |
698 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
699 | } | |
700 | ||
701 | static void srv6_init(void) | |
702 | { | |
703 | srv6_l3vpn_hash = | |
704 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
705 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
706 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
707 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
708 | } | |
709 | ||
710 | static void srv6_finish(void) | |
711 | { | |
712 | hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free); | |
713 | hash_free(srv6_l3vpn_hash); | |
714 | srv6_l3vpn_hash = NULL; | |
715 | hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
716 | hash_free(srv6_vpn_hash); | |
717 | srv6_vpn_hash = NULL; | |
718 | } | |
719 | ||
d8b87afe | 720 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 721 | { |
d62a17ae | 722 | const struct transit *transit = p; |
718e3744 | 723 | |
d62a17ae | 724 | return jhash(transit->val, transit->length, 0); |
718e3744 | 725 | } |
726 | ||
74df8d6d | 727 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 728 | { |
d62a17ae | 729 | const struct transit *transit1 = p1; |
730 | const struct transit *transit2 = p2; | |
923de654 | 731 | |
d62a17ae | 732 | return (transit1->length == transit2->length |
733 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 734 | } |
735 | ||
d62a17ae | 736 | static void transit_init(void) |
718e3744 | 737 | { |
996c9314 | 738 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 739 | "BGP Transit Hash"); |
718e3744 | 740 | } |
228da428 | 741 | |
d62a17ae | 742 | static void transit_finish(void) |
228da428 | 743 | { |
d62a17ae | 744 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
745 | hash_free(transit_hash); | |
746 | transit_hash = NULL; | |
228da428 | 747 | } |
6b0655a2 | 748 | |
718e3744 | 749 | /* Attribute hash routines. */ |
9bddac4b | 750 | static struct hash *attrhash; |
718e3744 | 751 | |
d62a17ae | 752 | unsigned long int attr_count(void) |
cbdfbaa5 | 753 | { |
d62a17ae | 754 | return attrhash->count; |
cbdfbaa5 PJ |
755 | } |
756 | ||
d62a17ae | 757 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 758 | { |
d62a17ae | 759 | return transit_hash->count; |
cbdfbaa5 PJ |
760 | } |
761 | ||
d8b87afe | 762 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 763 | { |
d62a17ae | 764 | const struct attr *attr = (struct attr *)p; |
765 | uint32_t key = 0; | |
c8e7b895 | 766 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 767 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 768 | |
0d0268a6 | 769 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
770 | MIX3(attr->local_pref, attr->aggregator_as, |
771 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
772 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
773 | attr->originator_id.s_addr); | |
774 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 775 | |
776 | if (attr->aspath) | |
777 | MIX(aspath_key_make(attr->aspath)); | |
9a706b42 DA |
778 | if (bgp_attr_get_community(attr)) |
779 | MIX(community_hash_make(bgp_attr_get_community(attr))); | |
1bcf3a96 DA |
780 | if (bgp_attr_get_lcommunity(attr)) |
781 | MIX(lcommunity_hash_make(bgp_attr_get_lcommunity(attr))); | |
b53e67a3 DA |
782 | if (bgp_attr_get_ecommunity(attr)) |
783 | MIX(ecommunity_hash_make(bgp_attr_get_ecommunity(attr))); | |
d04ac434 DS |
784 | if (bgp_attr_get_ipv6_ecommunity(attr)) |
785 | MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr))); | |
779fee93 DS |
786 | if (bgp_attr_get_cluster(attr)) |
787 | MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr))); | |
04fb21e2 DS |
788 | if (bgp_attr_get_transit(attr)) |
789 | MIX(transit_hash_key_make(bgp_attr_get_transit(attr))); | |
d62a17ae | 790 | if (attr->encap_subtlvs) |
791 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
b83127e1 HS |
792 | if (attr->srv6_l3vpn) |
793 | MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn)); | |
794 | if (attr->srv6_vpn) | |
795 | MIX(srv6_vpn_hash_key_make(attr->srv6_vpn)); | |
1e20238a | 796 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
797 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
798 | bgp_attr_get_vnc_subtlvs(attr); | |
799 | if (vnc_subtlvs) | |
800 | MIX(encap_hash_key_make(vnc_subtlvs)); | |
bede7744 | 801 | #endif |
d62a17ae | 802 | MIX(attr->mp_nexthop_len); |
803 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
804 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 805 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 806 | MIX(attr->rmap_table_id); |
0789eb69 KM |
807 | MIX(attr->nh_type); |
808 | MIX(attr->bh_type); | |
d864dd9e | 809 | MIX(attr->otc); |
97a52c82 | 810 | MIX(bgp_attr_get_aigp_metric(attr)); |
d62a17ae | 811 | |
812 | return key; | |
813 | } | |
814 | ||
74df8d6d | 815 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 816 | { |
817 | const struct attr *attr1 = p1; | |
818 | const struct attr *attr2 = p2; | |
819 | ||
820 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
821 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
822 | && attr1->aspath == attr2->aspath | |
9a706b42 DA |
823 | && bgp_attr_get_community(attr1) |
824 | == bgp_attr_get_community(attr2) | |
825 | && attr1->med == attr2->med | |
d62a17ae | 826 | && attr1->local_pref == attr2->local_pref |
827 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
2bb8b49c DS |
828 | if (attr1->aggregator_as == attr2->aggregator_as |
829 | && attr1->aggregator_addr.s_addr | |
830 | == attr2->aggregator_addr.s_addr | |
831 | && attr1->weight == attr2->weight | |
832 | && attr1->tag == attr2->tag | |
833 | && attr1->label_index == attr2->label_index | |
834 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
835 | && bgp_attr_get_ecommunity(attr1) | |
836 | == bgp_attr_get_ecommunity(attr2) | |
837 | && bgp_attr_get_ipv6_ecommunity(attr1) | |
838 | == bgp_attr_get_ipv6_ecommunity(attr2) | |
839 | && bgp_attr_get_lcommunity(attr1) | |
840 | == bgp_attr_get_lcommunity(attr2) | |
841 | && bgp_attr_get_cluster(attr1) | |
842 | == bgp_attr_get_cluster(attr2) | |
843 | && bgp_attr_get_transit(attr1) | |
844 | == bgp_attr_get_transit(attr2) | |
845 | && bgp_attr_get_aigp_metric(attr1) | |
846 | == bgp_attr_get_aigp_metric(attr2) | |
847 | && attr1->rmap_table_id == attr2->rmap_table_id | |
848 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
849 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 850 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
851 | && encap_same(bgp_attr_get_vnc_subtlvs(attr1), |
852 | bgp_attr_get_vnc_subtlvs(attr2)) | |
65efcfce | 853 | #endif |
0d0268a6 | 854 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
2bb8b49c DS |
855 | &attr2->mp_nexthop_global) |
856 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
857 | &attr2->mp_nexthop_local) | |
858 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
859 | &attr2->mp_nexthop_global_in) | |
860 | && IPV4_ADDR_SAME(&attr1->originator_id, | |
861 | &attr2->originator_id) | |
862 | && overlay_index_same(attr1, attr2) | |
863 | && !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) | |
864 | && attr1->es_flags == attr2->es_flags | |
865 | && attr1->mm_sync_seqnum == attr2->mm_sync_seqnum | |
866 | && attr1->df_pref == attr2->df_pref | |
867 | && attr1->df_alg == attr2->df_alg | |
868 | && attr1->nh_ifindex == attr2->nh_ifindex | |
869 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex | |
870 | && attr1->distance == attr2->distance | |
871 | && srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) | |
872 | && srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) | |
873 | && attr1->srte_color == attr2->srte_color | |
874 | && attr1->nh_type == attr2->nh_type | |
875 | && attr1->bh_type == attr2->bh_type | |
876 | && attr1->otc == attr2->otc) | |
74df8d6d | 877 | return true; |
d62a17ae | 878 | } |
aadc0905 | 879 | |
74df8d6d | 880 | return false; |
718e3744 | 881 | } |
882 | ||
d62a17ae | 883 | static void attrhash_init(void) |
718e3744 | 884 | { |
996c9314 LB |
885 | attrhash = |
886 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 887 | } |
888 | ||
289d2501 LB |
889 | /* |
890 | * special for hash_clean below | |
891 | */ | |
d62a17ae | 892 | static void attr_vfree(void *attr) |
289d2501 | 893 | { |
d62a17ae | 894 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
895 | } |
896 | ||
d62a17ae | 897 | static void attrhash_finish(void) |
228da428 | 898 | { |
d62a17ae | 899 | hash_clean(attrhash, attr_vfree); |
900 | hash_free(attrhash); | |
901 | attrhash = NULL; | |
228da428 CC |
902 | } |
903 | ||
e3b78da8 | 904 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 905 | { |
e3b78da8 | 906 | struct attr *attr = bucket->data; |
42d1ca39 DA |
907 | struct in6_addr *sid = NULL; |
908 | ||
909 | if (attr->srv6_l3vpn) | |
910 | sid = &attr->srv6_l3vpn->sid; | |
911 | else if (attr->srv6_vpn) | |
912 | sid = &attr->srv6_vpn->sid; | |
718e3744 | 913 | |
23d0a753 | 914 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 | 915 | |
e496b420 | 916 | vty_out(vty, |
07380148 DA |
917 | "\tflags: %" PRIu64 |
918 | " distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %pI6\n", | |
957f74c3 | 919 | attr->flag, attr->distance, attr->med, attr->local_pref, |
42d1ca39 | 920 | attr->origin, attr->weight, attr->label, sid); |
718e3744 | 921 | } |
922 | ||
d62a17ae | 923 | void attr_show_all(struct vty *vty) |
718e3744 | 924 | { |
e3b78da8 | 925 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
926 | void *))attr_show_all_iterator, |
927 | vty); | |
718e3744 | 928 | } |
929 | ||
d62a17ae | 930 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 931 | { |
d62a17ae | 932 | struct attr *val = (struct attr *)p; |
933 | struct attr *attr; | |
718e3744 | 934 | |
d62a17ae | 935 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
936 | *attr = *val; | |
937 | if (val->encap_subtlvs) { | |
938 | val->encap_subtlvs = NULL; | |
939 | } | |
1e20238a | 940 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
941 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
942 | bgp_attr_get_vnc_subtlvs(val); | |
943 | ||
944 | if (vnc_subtlvs) | |
945 | bgp_attr_set_vnc_subtlvs(val, NULL); | |
65efcfce | 946 | #endif |
e496b420 | 947 | |
d62a17ae | 948 | attr->refcnt = 0; |
949 | return attr; | |
718e3744 | 950 | } |
951 | ||
952 | /* Internet argument attribute. */ | |
d62a17ae | 953 | struct attr *bgp_attr_intern(struct attr *attr) |
954 | { | |
955 | struct attr *find; | |
b53e67a3 DA |
956 | struct ecommunity *ecomm = NULL; |
957 | struct ecommunity *ipv6_ecomm = NULL; | |
1bcf3a96 | 958 | struct lcommunity *lcomm = NULL; |
9a706b42 | 959 | struct community *comm = NULL; |
d62a17ae | 960 | |
544be979 | 961 | /* Intern referenced structure. */ |
d62a17ae | 962 | if (attr->aspath) { |
963 | if (!attr->aspath->refcnt) | |
964 | attr->aspath = aspath_intern(attr->aspath); | |
965 | else | |
966 | attr->aspath->refcnt++; | |
967 | } | |
9a706b42 DA |
968 | |
969 | comm = bgp_attr_get_community(attr); | |
970 | if (comm) { | |
971 | if (!comm->refcnt) | |
972 | bgp_attr_set_community(attr, community_intern(comm)); | |
d62a17ae | 973 | else |
9a706b42 | 974 | comm->refcnt++; |
d62a17ae | 975 | } |
976 | ||
b53e67a3 | 977 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
978 | if (ecomm) { |
979 | if (!ecomm->refcnt) | |
b53e67a3 | 980 | bgp_attr_set_ecommunity(attr, ecommunity_intern(ecomm)); |
9a659715 | 981 | else |
d04ac434 | 982 | ecomm->refcnt++; |
9a659715 PG |
983 | } |
984 | ||
b53e67a3 DA |
985 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
986 | if (ipv6_ecomm) { | |
987 | if (!ipv6_ecomm->refcnt) | |
988 | bgp_attr_set_ipv6_ecommunity( | |
989 | attr, ecommunity_intern(ipv6_ecomm)); | |
990 | else | |
991 | ipv6_ecomm->refcnt++; | |
992 | } | |
993 | ||
1bcf3a96 DA |
994 | lcomm = bgp_attr_get_lcommunity(attr); |
995 | if (lcomm) { | |
996 | if (!lcomm->refcnt) | |
997 | bgp_attr_set_lcommunity(attr, lcommunity_intern(lcomm)); | |
d62a17ae | 998 | else |
1bcf3a96 | 999 | lcomm->refcnt++; |
d62a17ae | 1000 | } |
779fee93 DS |
1001 | |
1002 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); | |
1003 | ||
1004 | if (cluster) { | |
1005 | if (!cluster->refcnt) | |
1006 | bgp_attr_set_cluster(attr, cluster_intern(cluster)); | |
d62a17ae | 1007 | else |
779fee93 | 1008 | cluster->refcnt++; |
d62a17ae | 1009 | } |
04fb21e2 DS |
1010 | |
1011 | struct transit *transit = bgp_attr_get_transit(attr); | |
1012 | ||
1013 | if (transit) { | |
1014 | if (!transit->refcnt) | |
1015 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
d62a17ae | 1016 | else |
04fb21e2 | 1017 | transit->refcnt++; |
d62a17ae | 1018 | } |
1019 | if (attr->encap_subtlvs) { | |
1020 | if (!attr->encap_subtlvs->refcnt) | |
1021 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
1022 | ENCAP_SUBTLV_TYPE); | |
1023 | else | |
1024 | attr->encap_subtlvs->refcnt++; | |
1025 | } | |
e496b420 HS |
1026 | if (attr->srv6_l3vpn) { |
1027 | if (!attr->srv6_l3vpn->refcnt) | |
1028 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
1029 | else | |
1030 | attr->srv6_l3vpn->refcnt++; | |
1031 | } | |
1032 | if (attr->srv6_vpn) { | |
1033 | if (!attr->srv6_vpn->refcnt) | |
1034 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
1035 | else | |
1036 | attr->srv6_vpn->refcnt++; | |
1037 | } | |
1e20238a | 1038 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1039 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1040 | bgp_attr_get_vnc_subtlvs(attr); | |
1041 | ||
1042 | if (vnc_subtlvs) { | |
1043 | if (!vnc_subtlvs->refcnt) | |
1044 | bgp_attr_set_vnc_subtlvs( | |
1045 | attr, | |
1046 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
d62a17ae | 1047 | else |
91ebf12c | 1048 | vnc_subtlvs->refcnt++; |
d62a17ae | 1049 | } |
aadc0905 | 1050 | #endif |
bede7744 | 1051 | |
dbbac180 DL |
1052 | /* At this point, attr only contains intern'd pointers. that means |
1053 | * if we find it in attrhash, it has all the same pointers and we | |
1054 | * correctly updated the refcounts on these. | |
1055 | * If we don't find it, we need to allocate a one because in all | |
1056 | * cases this returns a new reference to a hashed attr, but the input | |
1057 | * wasn't on hash. */ | |
d62a17ae | 1058 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
1059 | find->refcnt++; | |
1060 | ||
1061 | return find; | |
718e3744 | 1062 | } |
1063 | ||
1064 | /* Make network statement's attribute. */ | |
0f05ea43 DA |
1065 | struct attr *bgp_attr_default_set(struct attr *attr, struct bgp *bgp, |
1066 | uint8_t origin) | |
718e3744 | 1067 | { |
d62a17ae | 1068 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 1069 | |
d62a17ae | 1070 | attr->origin = origin; |
1071 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1072 | attr->aspath = aspath_empty(); | |
1073 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1074 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1075 | attr->tag = 0; | |
1076 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
1077 | attr->label = MPLS_INVALID_LABEL; | |
1078 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1079 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
0f05ea43 | 1080 | attr->local_pref = bgp->default_local_pref; |
d62a17ae | 1081 | |
1082 | return attr; | |
718e3744 | 1083 | } |
1084 | ||
b5d58c32 | 1085 | /* Create the attributes for an aggregate */ |
5f040085 DS |
1086 | struct attr *bgp_attr_aggregate_intern( |
1087 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
1088 | struct community *community, struct ecommunity *ecommunity, | |
1089 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
1090 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 1091 | { |
1092 | struct attr attr; | |
1093 | struct attr *new; | |
fd283bd2 | 1094 | route_map_result_t ret; |
d62a17ae | 1095 | |
6006b807 | 1096 | memset(&attr, 0, sizeof(attr)); |
d62a17ae | 1097 | |
1098 | /* Origin attribute. */ | |
1099 | attr.origin = origin; | |
1100 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1101 | ||
59136db5 DA |
1102 | /* MED */ |
1103 | attr.med = 0; | |
1104 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); | |
1105 | ||
d62a17ae | 1106 | /* AS path attribute. */ |
1107 | if (aspath) | |
1108 | attr.aspath = aspath_intern(aspath); | |
1109 | else | |
1110 | attr.aspath = aspath_empty(); | |
1111 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1112 | ||
1113 | /* Next hop attribute. */ | |
1114 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1115 | ||
1116 | if (community) { | |
d7c0a89a | 1117 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
1118 | |
1119 | /* If we are not shutting down ourselves and we are | |
1120 | * aggregating a route that contains the GSHUT community we | |
1121 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 1122 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 1123 | && community_include(community, gshut)) { |
7f323236 DW |
1124 | community_del_val(community, &gshut); |
1125 | } | |
1126 | ||
9a706b42 | 1127 | bgp_attr_set_community(&attr, community); |
d62a17ae | 1128 | } |
1129 | ||
58cf5c08 | 1130 | if (ecommunity) |
b53e67a3 | 1131 | bgp_attr_set_ecommunity(&attr, ecommunity); |
3da2cc32 | 1132 | |
9d34440b | 1133 | if (lcommunity) |
1bcf3a96 | 1134 | bgp_attr_set_lcommunity(&attr, lcommunity); |
dd18c5a9 | 1135 | |
637e5ba4 | 1136 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 1137 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 1138 | |
d62a17ae | 1139 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
1140 | attr.label = MPLS_INVALID_LABEL; | |
1141 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1142 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 1143 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 1144 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
1145 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1146 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1147 | attr.aggregator_as = bgp->confed_id; | |
1148 | else | |
1149 | attr.aggregator_as = bgp->as; | |
1150 | attr.aggregator_addr = bgp->router_id; | |
d62a17ae | 1151 | |
20894f50 DA |
1152 | /* Apply route-map */ |
1153 | if (aggregate->rmap.name) { | |
1154 | struct attr attr_tmp = attr; | |
1155 | struct bgp_path_info rmap_path; | |
1156 | ||
6006b807 | 1157 | memset(&rmap_path, 0, sizeof(rmap_path)); |
20894f50 DA |
1158 | rmap_path.peer = bgp->peer_self; |
1159 | rmap_path.attr = &attr_tmp; | |
1160 | ||
1161 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1162 | ||
1782514f | 1163 | ret = route_map_apply(aggregate->rmap.map, p, &rmap_path); |
20894f50 DA |
1164 | |
1165 | bgp->peer_self->rmap_type = 0; | |
1166 | ||
1167 | if (ret == RMAP_DENYMATCH) { | |
1168 | /* Free uninterned attribute. */ | |
1169 | bgp_attr_flush(&attr_tmp); | |
1170 | ||
1171 | /* Unintern original. */ | |
1172 | aspath_unintern(&attr.aspath); | |
1173 | return NULL; | |
1174 | } | |
1175 | ||
637e5ba4 | 1176 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1177 | bgp_attr_add_gshut_community(&attr_tmp); |
1178 | ||
1179 | new = bgp_attr_intern(&attr_tmp); | |
1180 | } else { | |
1181 | ||
637e5ba4 | 1182 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1183 | bgp_attr_add_gshut_community(&attr); |
1184 | ||
1185 | new = bgp_attr_intern(&attr); | |
1186 | } | |
d62a17ae | 1187 | |
8bd0d3b1 RZ |
1188 | /* Always release the 'intern()'ed AS Path. */ |
1189 | aspath_unintern(&attr.aspath); | |
1190 | ||
d62a17ae | 1191 | return new; |
718e3744 | 1192 | } |
1193 | ||
b881c707 | 1194 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1195 | void bgp_attr_unintern_sub(struct attr *attr) |
1196 | { | |
b53e67a3 DA |
1197 | struct ecommunity *ecomm = NULL; |
1198 | struct ecommunity *ipv6_ecomm = NULL; | |
779fee93 | 1199 | struct cluster_list *cluster; |
1bcf3a96 | 1200 | struct lcommunity *lcomm = NULL; |
9a706b42 | 1201 | struct community *comm = NULL; |
d04ac434 | 1202 | |
d62a17ae | 1203 | /* aspath refcount shoud be decrement. */ |
b7b3e63c | 1204 | aspath_unintern(&attr->aspath); |
d62a17ae | 1205 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); |
1206 | ||
9a706b42 DA |
1207 | comm = bgp_attr_get_community(attr); |
1208 | community_unintern(&comm); | |
9a706b42 | 1209 | bgp_attr_set_community(attr, NULL); |
d62a17ae | 1210 | |
b53e67a3 DA |
1211 | ecomm = bgp_attr_get_ecommunity(attr); |
1212 | ecommunity_unintern(&ecomm); | |
b53e67a3 | 1213 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 1214 | |
b53e67a3 DA |
1215 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1216 | ecommunity_unintern(&ipv6_ecomm); | |
d04ac434 | 1217 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a659715 | 1218 | |
1bcf3a96 DA |
1219 | lcomm = bgp_attr_get_lcommunity(attr); |
1220 | lcommunity_unintern(&lcomm); | |
1bcf3a96 | 1221 | bgp_attr_set_lcommunity(attr, NULL); |
d62a17ae | 1222 | |
779fee93 DS |
1223 | cluster = bgp_attr_get_cluster(attr); |
1224 | if (cluster) { | |
1225 | cluster_unintern(&cluster); | |
1226 | bgp_attr_set_cluster(attr, cluster); | |
1227 | } | |
d62a17ae | 1228 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1229 | ||
04fb21e2 DS |
1230 | struct transit *transit = bgp_attr_get_transit(attr); |
1231 | ||
1232 | if (transit) { | |
1233 | transit_unintern(&transit); | |
1234 | bgp_attr_set_transit(attr, transit); | |
1235 | } | |
d62a17ae | 1236 | |
1237 | if (attr->encap_subtlvs) | |
1238 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1239 | |
1e20238a | 1240 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1241 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1242 | bgp_attr_get_vnc_subtlvs(attr); | |
1243 | ||
1244 | if (vnc_subtlvs) { | |
1245 | encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1246 | bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs); | |
1247 | } | |
bede7744 | 1248 | #endif |
e496b420 HS |
1249 | |
1250 | if (attr->srv6_l3vpn) | |
1251 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1252 | ||
1253 | if (attr->srv6_vpn) | |
1254 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1255 | } |
1256 | ||
718e3744 | 1257 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1258 | void bgp_attr_unintern(struct attr **pattr) |
1259 | { | |
1260 | struct attr *attr = *pattr; | |
1261 | struct attr *ret; | |
1262 | struct attr tmp; | |
1263 | ||
1264 | /* Decrement attribute reference. */ | |
1265 | attr->refcnt--; | |
1266 | ||
1267 | tmp = *attr; | |
1268 | ||
1269 | /* If reference becomes zero then free attribute object. */ | |
1270 | if (attr->refcnt == 0) { | |
1271 | ret = hash_release(attrhash, attr); | |
1272 | assert(ret != NULL); | |
1273 | XFREE(MTYPE_ATTR, attr); | |
1274 | *pattr = NULL; | |
1275 | } | |
1276 | ||
1277 | bgp_attr_unintern_sub(&tmp); | |
1278 | } | |
1279 | ||
1280 | void bgp_attr_flush(struct attr *attr) | |
1281 | { | |
d04ac434 | 1282 | struct ecommunity *ecomm; |
b53e67a3 | 1283 | struct ecommunity *ipv6_ecomm; |
779fee93 | 1284 | struct cluster_list *cluster; |
1bcf3a96 | 1285 | struct lcommunity *lcomm; |
9a706b42 | 1286 | struct community *comm; |
d04ac434 | 1287 | |
d62a17ae | 1288 | if (attr->aspath && !attr->aspath->refcnt) { |
1289 | aspath_free(attr->aspath); | |
1290 | attr->aspath = NULL; | |
1291 | } | |
9a706b42 DA |
1292 | comm = bgp_attr_get_community(attr); |
1293 | if (comm && !comm->refcnt) | |
1294 | community_free(&comm); | |
1295 | bgp_attr_set_community(attr, NULL); | |
1296 | ||
b53e67a3 | 1297 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
1298 | if (ecomm && !ecomm->refcnt) |
1299 | ecommunity_free(&ecomm); | |
b53e67a3 | 1300 | bgp_attr_set_ecommunity(attr, NULL); |
9a706b42 | 1301 | |
b53e67a3 DA |
1302 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1303 | if (ipv6_ecomm && !ipv6_ecomm->refcnt) | |
1304 | ecommunity_free(&ipv6_ecomm); | |
d04ac434 | 1305 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a706b42 | 1306 | |
1bcf3a96 DA |
1307 | lcomm = bgp_attr_get_lcommunity(attr); |
1308 | if (lcomm && !lcomm->refcnt) | |
1309 | lcommunity_free(&lcomm); | |
1310 | bgp_attr_set_lcommunity(attr, NULL); | |
779fee93 DS |
1311 | |
1312 | cluster = bgp_attr_get_cluster(attr); | |
1313 | if (cluster && !cluster->refcnt) { | |
1314 | cluster_free(cluster); | |
1315 | bgp_attr_set_cluster(attr, NULL); | |
d62a17ae | 1316 | } |
04fb21e2 DS |
1317 | |
1318 | struct transit *transit = bgp_attr_get_transit(attr); | |
1319 | ||
1320 | if (transit && !transit->refcnt) { | |
1321 | transit_free(transit); | |
1322 | bgp_attr_set_transit(attr, NULL); | |
d62a17ae | 1323 | } |
1324 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1325 | encap_free(attr->encap_subtlvs); | |
1326 | attr->encap_subtlvs = NULL; | |
1327 | } | |
b83127e1 HS |
1328 | if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) { |
1329 | srv6_l3vpn_free(attr->srv6_l3vpn); | |
1330 | attr->srv6_l3vpn = NULL; | |
1331 | } | |
1332 | if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) { | |
1333 | srv6_vpn_free(attr->srv6_vpn); | |
1334 | attr->srv6_vpn = NULL; | |
1335 | } | |
1e20238a | 1336 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1337 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1338 | bgp_attr_get_vnc_subtlvs(attr); | |
1339 | ||
1340 | if (vnc_subtlvs && !vnc_subtlvs->refcnt) { | |
1341 | encap_free(vnc_subtlvs); | |
1342 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 1343 | } |
aadc0905 | 1344 | #endif |
718e3744 | 1345 | } |
1346 | ||
b881c707 PJ |
1347 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1348 | * avoid resetting sessions for malformed attributes which are | |
1349 | * are partial/optional and hence where the error likely was not | |
1350 | * introduced by the sending neighbour. | |
1351 | */ | |
79288e4c | 1352 | static enum bgp_attr_parse_ret |
d7c0a89a | 1353 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1354 | bgp_size_t length) |
1355 | { | |
1356 | struct peer *const peer = args->peer; | |
599f7b33 | 1357 | struct attr *const attr = args->attr; |
d7c0a89a | 1358 | const uint8_t flags = args->flags; |
d62a17ae | 1359 | /* startp and length must be special-cased, as whether or not to |
1360 | * send the attribute data with the NOTIFY depends on the error, | |
1361 | * the caller therefore signals this with the seperate length argument | |
1362 | */ | |
d7c0a89a | 1363 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1364 | |
599f7b33 DA |
1365 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1366 | char attr_str[BUFSIZ] = {0}; | |
1367 | ||
99ab4d23 | 1368 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1369 | |
1370 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1371 | } | |
1372 | ||
d62a17ae | 1373 | /* Only relax error handling for eBGP peers */ |
1374 | if (peer->sort != BGP_PEER_EBGP) { | |
1375 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1376 | notify_datap, length); | |
1377 | return BGP_ATTR_PARSE_ERROR; | |
1378 | } | |
1379 | ||
1380 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1381 | * still proceed but the caller hasn't read all the attribute. | |
1382 | */ | |
1383 | stream_set_getp(BGP_INPUT(peer), | |
1384 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1385 | + args->total); | |
1386 | ||
1387 | switch (args->type) { | |
1388 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1389 | * affect route selection, and can be safely ignored, then any such | |
1390 | * attributes which are malformed should just be ignored and the route | |
1391 | * processed as normal. | |
1392 | */ | |
1393 | case BGP_ATTR_AS4_AGGREGATOR: | |
1394 | case BGP_ATTR_AGGREGATOR: | |
1395 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1396 | return BGP_ATTR_PARSE_PROCEED; | |
1397 | ||
1398 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1399 | * selection, should be treat-as-withdraw. |
d62a17ae | 1400 | */ |
1401 | case BGP_ATTR_ORIGIN: | |
1402 | case BGP_ATTR_AS_PATH: | |
1403 | case BGP_ATTR_NEXT_HOP: | |
1404 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1405 | case BGP_ATTR_LOCAL_PREF: | |
1406 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1407 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1408 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1409 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1410 | case BGP_ATTR_ORIGINATOR_ID: |
1411 | case BGP_ATTR_CLUSTER_LIST: | |
adc1c459 | 1412 | case BGP_ATTR_OTC: |
4ba5a9c5 | 1413 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1414 | case BGP_ATTR_MP_REACH_NLRI: |
1415 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1416 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1417 | notify_datap, length); | |
1418 | return BGP_ATTR_PARSE_ERROR; | |
1419 | } | |
1420 | ||
1421 | /* Partial optional attributes that are malformed should not cause | |
1422 | * the whole session to be reset. Instead treat it as a withdrawal | |
1423 | * of the routes, if possible. | |
1424 | */ | |
1425 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1426 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1427 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1428 | return BGP_ATTR_PARSE_WITHDRAW; | |
1429 | ||
1430 | /* default to reset */ | |
1431 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1432 | } |
1433 | ||
afcb7679 DO |
1434 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1435 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1436 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1437 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1438 | non-transitive" attribute. */ | |
1439 | static void | |
d62a17ae | 1440 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1441 | uint8_t desired_flags /* how RFC says it must be */ |
1442 | ) | |
d62a17ae | 1443 | { |
d7c0a89a QY |
1444 | uint8_t seen = 0, i; |
1445 | uint8_t real_flags = args->flags; | |
1446 | const uint8_t attr_code = args->type; | |
d62a17ae | 1447 | |
1448 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1449 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1450 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1451 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1452 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1453 | flog_err(EC_BGP_ATTR_FLAG, |
1454 | "%s attribute must%s be flagged as \"%s\"", | |
1455 | lookup_msg(attr_str, attr_code, NULL), | |
1456 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1457 | ? "" | |
1458 | : " not", | |
1459 | attr_flag_str[i].str); | |
d62a17ae | 1460 | seen = 1; |
1461 | } | |
1462 | if (!seen) { | |
1463 | zlog_debug( | |
3efd0893 | 1464 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1465 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1466 | real_flags, desired_flags); | |
1467 | } | |
afcb7679 DO |
1468 | } |
1469 | ||
3ecab4c8 PJ |
1470 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1471 | * as will PARTIAL for optional+transitive attributes. | |
1472 | */ | |
d7c0a89a QY |
1473 | const uint8_t attr_flags_values[] = { |
1474 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1475 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1476 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1477 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1478 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1479 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1480 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1481 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1482 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1483 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1484 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1485 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1486 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1487 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1488 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1489 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1490 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1491 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1492 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1493 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
d864dd9e | 1494 | [BGP_ATTR_OTC] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
d7c0a89a | 1495 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
9a659715 PG |
1496 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1497 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
97a52c82 | 1498 | [BGP_ATTR_AIGP] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
3ecab4c8 | 1499 | }; |
099111ef | 1500 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1501 | |
3dc339cd | 1502 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1503 | { |
d7c0a89a QY |
1504 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1505 | const uint8_t flags = args->flags; | |
1506 | const uint8_t attr_code = args->type; | |
d62a17ae | 1507 | |
1508 | /* there may be attributes we don't know about */ | |
1509 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1510 | return false; |
d62a17ae | 1511 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1512 | return false; |
d62a17ae | 1513 | |
1514 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1515 | * to | |
1516 | * 1." | |
1517 | */ | |
1518 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1519 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1520 | flog_err( |
e50f7cfd | 1521 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1522 | "%s well-known attributes must have transitive flag set (%x)", |
1523 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1524 | return true; |
d62a17ae | 1525 | } |
1526 | ||
1527 | /* "For well-known attributes and for optional non-transitive | |
1528 | * attributes, | |
1529 | * the Partial bit MUST be set to 0." | |
1530 | */ | |
1531 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1532 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1533 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1534 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1535 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1536 | return true; |
d62a17ae | 1537 | } |
1538 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1539 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1540 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1541 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1542 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1543 | return true; |
d62a17ae | 1544 | } |
1545 | } | |
1546 | ||
1547 | /* Optional transitive attributes may go through speakers that don't | |
1548 | * reocgnise them and set the Partial bit. | |
1549 | */ | |
1550 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1551 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1552 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1553 | ||
1554 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1555 | return false; |
d62a17ae | 1556 | |
1557 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1558 | return true; |
3ecab4c8 PJ |
1559 | } |
1560 | ||
718e3744 | 1561 | /* Get origin attribute of the update message. */ |
79288e4c DA |
1562 | static enum bgp_attr_parse_ret |
1563 | bgp_attr_origin(struct bgp_attr_parser_args *args) | |
d62a17ae | 1564 | { |
1565 | struct peer *const peer = args->peer; | |
1566 | struct attr *const attr = args->attr; | |
1567 | const bgp_size_t length = args->length; | |
1568 | ||
1569 | /* If any recognized attribute has Attribute Length that conflicts | |
1570 | with the expected length (based on the attribute type code), then | |
1571 | the Error Subcode is set to Attribute Length Error. The Data | |
1572 | field contains the erroneous attribute (type, length and | |
1573 | value). */ | |
1574 | if (length != 1) { | |
e50f7cfd | 1575 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1576 | "Origin attribute length is not one %d", length); |
d62a17ae | 1577 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1578 | args->total); | |
1579 | } | |
1580 | ||
1581 | /* Fetch origin attribute. */ | |
1582 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1583 | ||
1584 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1585 | Subcode is set to Invalid Origin Attribute. The Data field | |
1586 | contains the unrecognized attribute (type, length and value). */ | |
1587 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1588 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1589 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1590 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1591 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1592 | args->total); | |
1593 | } | |
1594 | ||
1595 | /* Set oring attribute flag. */ | |
1596 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1597 | ||
1598 | return 0; | |
718e3744 | 1599 | } |
ab005298 PJ |
1600 | |
1601 | /* Parse AS path information. This function is wrapper of | |
1602 | aspath_parse. */ | |
d62a17ae | 1603 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1604 | { | |
1605 | struct attr *const attr = args->attr; | |
1606 | struct peer *const peer = args->peer; | |
1607 | const bgp_size_t length = args->length; | |
1608 | ||
1609 | /* | |
1610 | * peer with AS4 => will get 4Byte ASnums | |
1611 | * otherwise, will get 16 Bit | |
1612 | */ | |
8cff42ad DA |
1613 | attr->aspath = aspath_parse( |
1614 | peer->curr, length, | |
1615 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) | |
1616 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)); | |
d62a17ae | 1617 | |
1618 | /* In case of IBGP, length will be zero. */ | |
1619 | if (!attr->aspath) { | |
e50f7cfd | 1620 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1621 | "Malformed AS path from %s, length is %d", peer->host, |
1622 | length); | |
d62a17ae | 1623 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1624 | 0); | |
1625 | } | |
0b2aa3a0 | 1626 | |
1bd36763 DA |
1627 | /* Conformant BGP speakers SHOULD NOT send BGP |
1628 | * UPDATE messages containing AS_SET or AS_CONFED_SET. Upon receipt of | |
1629 | * such messages, conformant BGP speakers SHOULD use the "Treat-as- | |
1630 | * withdraw" error handling behavior as per [RFC7606]. | |
1631 | */ | |
1632 | if (peer->bgp->reject_as_sets && aspath_check_as_sets(attr->aspath)) { | |
1633 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, | |
1634 | "AS_SET and AS_CONFED_SET are deprecated from %pBP", | |
1635 | peer); | |
1636 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1637 | 0); | |
1638 | } | |
1639 | ||
d62a17ae | 1640 | /* Set aspath attribute flag. */ |
1641 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1642 | ||
1643 | return BGP_ATTR_PARSE_PROCEED; | |
1644 | } | |
1645 | ||
79288e4c DA |
1646 | static enum bgp_attr_parse_ret bgp_attr_aspath_check(struct peer *const peer, |
1647 | struct attr *const attr) | |
d62a17ae | 1648 | { |
1649 | /* These checks were part of bgp_attr_aspath, but with | |
1650 | * as4 we should to check aspath things when | |
1651 | * aspath synthesizing with as4_path has already taken place. | |
1652 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1653 | * not right. | |
1654 | * So do the checks later, i.e. here | |
1655 | */ | |
d62a17ae | 1656 | struct aspath *aspath; |
1657 | ||
1658 | /* Confederation sanity check. */ | |
1659 | if ((peer->sort == BGP_PEER_CONFED | |
1660 | && !aspath_left_confed_check(attr->aspath)) | |
1661 | || (peer->sort == BGP_PEER_EBGP | |
1662 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1663 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1664 | peer->host); |
4ba5a9c5 | 1665 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1666 | } |
cddb8112 | 1667 | |
d62a17ae | 1668 | /* First AS check for EBGP. */ |
47cbc09b | 1669 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1670 | if (peer->sort == BGP_PEER_EBGP |
1671 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1672 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1673 | "%s incorrect first AS (must be %u)", |
1674 | peer->host, peer->as); | |
4ba5a9c5 | 1675 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1676 | } |
1677 | } | |
0b2aa3a0 | 1678 | |
88cc0ce4 DA |
1679 | /* Codification of AS 0 Processing */ |
1680 | if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) { | |
1681 | flog_err( | |
1682 | EC_BGP_ATTR_MAL_AS_PATH, | |
1683 | "Malformed AS path, AS number is 0 in the path from %s", | |
1684 | peer->host); | |
1685 | return BGP_ATTR_PARSE_WITHDRAW; | |
1686 | } | |
1687 | ||
d62a17ae | 1688 | /* local-as prepend */ |
1689 | if (peer->change_local_as | |
1690 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1691 | aspath = aspath_dup(attr->aspath); | |
1692 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1693 | aspath_unintern(&attr->aspath); | |
1694 | attr->aspath = aspath_intern(aspath); | |
1695 | } | |
0b2aa3a0 | 1696 | |
d62a17ae | 1697 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1698 | } |
1699 | ||
ab005298 PJ |
1700 | /* Parse AS4 path information. This function is another wrapper of |
1701 | aspath_parse. */ | |
d62a17ae | 1702 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1703 | struct aspath **as4_path) | |
ab005298 | 1704 | { |
d62a17ae | 1705 | struct peer *const peer = args->peer; |
1706 | struct attr *const attr = args->attr; | |
1707 | const bgp_size_t length = args->length; | |
ab005298 | 1708 | |
424ab01d | 1709 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1710 | |
d62a17ae | 1711 | /* In case of IBGP, length will be zero. */ |
1712 | if (!*as4_path) { | |
e50f7cfd | 1713 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1714 | "Malformed AS4 path from %s, length is %d", peer->host, |
1715 | length); | |
d62a17ae | 1716 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1717 | 0); | |
1718 | } | |
ab005298 | 1719 | |
1bd36763 DA |
1720 | /* Conformant BGP speakers SHOULD NOT send BGP |
1721 | * UPDATE messages containing AS_SET or AS_CONFED_SET. Upon receipt of | |
1722 | * such messages, conformant BGP speakers SHOULD use the "Treat-as- | |
1723 | * withdraw" error handling behavior as per [RFC7606]. | |
1724 | */ | |
1725 | if (peer->bgp->reject_as_sets && aspath_check_as_sets(attr->aspath)) { | |
1726 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, | |
1727 | "AS_SET and AS_CONFED_SET are deprecated from %pBP", | |
1728 | peer); | |
1729 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1730 | 0); | |
1731 | } | |
1732 | ||
d62a17ae | 1733 | /* Set aspath attribute flag. */ |
1734 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1735 | ||
1736 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1737 | } |
1738 | ||
9738e9aa | 1739 | /* |
1740 | * Check that the nexthop attribute is valid. | |
1741 | */ | |
79288e4c DA |
1742 | enum bgp_attr_parse_ret bgp_attr_nexthop_valid(struct peer *peer, |
1743 | struct attr *attr) | |
9738e9aa | 1744 | { |
8666265e | 1745 | struct bgp *bgp = peer->bgp; |
9738e9aa | 1746 | |
70632160 | 1747 | if (ipv4_martian(&attr->nexthop) && !bgp->allow_martian) { |
7decb30c | 1748 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1749 | |
07380148 DA |
1750 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %pI4", |
1751 | &attr->nexthop); | |
7decb30c DS |
1752 | data[0] = BGP_ATTR_FLAG_TRANS; |
1753 | data[1] = BGP_ATTR_NEXT_HOP; | |
1754 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1755 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1756 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1757 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1758 | data, 7); | |
9738e9aa | 1759 | return BGP_ATTR_PARSE_ERROR; |
1760 | } | |
1761 | ||
1762 | return BGP_ATTR_PARSE_PROCEED; | |
1763 | } | |
1764 | ||
718e3744 | 1765 | /* Nexthop attribute. */ |
79288e4c DA |
1766 | static enum bgp_attr_parse_ret |
1767 | bgp_attr_nexthop(struct bgp_attr_parser_args *args) | |
d62a17ae | 1768 | { |
1769 | struct peer *const peer = args->peer; | |
1770 | struct attr *const attr = args->attr; | |
1771 | const bgp_size_t length = args->length; | |
1772 | ||
d62a17ae | 1773 | /* Check nexthop attribute length. */ |
1774 | if (length != 4) { | |
e50f7cfd | 1775 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1776 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1777 | |
1778 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1779 | args->total); | |
1780 | } | |
1781 | ||
88f33d66 | 1782 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1783 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1784 | ||
1785 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1786 | } |
1787 | ||
1788 | /* MED atrribute. */ | |
79288e4c | 1789 | static enum bgp_attr_parse_ret bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1790 | { |
d62a17ae | 1791 | struct peer *const peer = args->peer; |
1792 | struct attr *const attr = args->attr; | |
1793 | const bgp_size_t length = args->length; | |
b881c707 | 1794 | |
d62a17ae | 1795 | /* Length check. */ |
1796 | if (length != 4) { | |
e50f7cfd | 1797 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1798 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1799 | |
d62a17ae | 1800 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1801 | args->total); | |
1802 | } | |
1803 | ||
424ab01d | 1804 | attr->med = stream_getl(peer->curr); |
718e3744 | 1805 | |
d62a17ae | 1806 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1807 | |
d62a17ae | 1808 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1809 | } |
1810 | ||
1811 | /* Local preference attribute. */ | |
79288e4c | 1812 | static enum bgp_attr_parse_ret |
d62a17ae | 1813 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1814 | { | |
1815 | struct peer *const peer = args->peer; | |
1816 | struct attr *const attr = args->attr; | |
1817 | const bgp_size_t length = args->length; | |
1818 | ||
4ba5a9c5 DA |
1819 | /* if received from an internal neighbor, it SHALL be considered |
1820 | * malformed if its length is not equal to 4. If malformed, the | |
1821 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1822 | * withdraw". | |
1823 | */ | |
1824 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1825 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1826 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1827 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1828 | args->total); | |
1829 | } | |
1830 | ||
1831 | /* If it is contained in an UPDATE message that is received from an | |
1832 | external peer, then this attribute MUST be ignored by the | |
1833 | receiving speaker. */ | |
1834 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1835 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1836 | return BGP_ATTR_PARSE_PROCEED; |
1837 | } | |
1838 | ||
ad61f778 | 1839 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1840 | |
7f323236 | 1841 | /* Set the local-pref flag. */ |
d62a17ae | 1842 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1843 | ||
1844 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1845 | |
1846 | stream_failure: | |
1847 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1848 | args->total); | |
718e3744 | 1849 | } |
1850 | ||
1851 | /* Atomic aggregate. */ | |
d62a17ae | 1852 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1853 | { |
a5c6a9b1 | 1854 | struct peer *const peer = args->peer; |
d62a17ae | 1855 | struct attr *const attr = args->attr; |
1856 | const bgp_size_t length = args->length; | |
1857 | ||
1858 | /* Length check. */ | |
1859 | if (length != 0) { | |
e50f7cfd | 1860 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1861 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1862 | length); | |
d62a17ae | 1863 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1864 | args->total); | |
1865 | } | |
718e3744 | 1866 | |
a5c6a9b1 DA |
1867 | if (peer->discard_attrs[args->type]) |
1868 | goto atomic_ignore; | |
1869 | ||
d62a17ae | 1870 | /* Set atomic aggregate flag. */ |
1871 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1872 | |
d62a17ae | 1873 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1874 | |
1875 | atomic_ignore: | |
1876 | stream_forward_getp(peer->curr, length); | |
1877 | ||
1878 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1879 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
1880 | lookup_msg(attr_str, args->type, NULL)); | |
1881 | ||
1882 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1883 | } |
1884 | ||
1885 | /* Aggregator attribute */ | |
d62a17ae | 1886 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1887 | { | |
1888 | struct peer *const peer = args->peer; | |
1889 | struct attr *const attr = args->attr; | |
1890 | const bgp_size_t length = args->length; | |
33d022bc | 1891 | as_t aggregator_as; |
d62a17ae | 1892 | |
1893 | int wantedlen = 6; | |
1894 | ||
1895 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1896 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1897 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1898 | wantedlen = 8; |
1899 | ||
1900 | if (length != wantedlen) { | |
e50f7cfd | 1901 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1902 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1903 | length); | |
d62a17ae | 1904 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1905 | args->total); | |
1906 | } | |
1907 | ||
a5c6a9b1 DA |
1908 | if (peer->discard_attrs[args->type]) |
1909 | goto aggregator_ignore; | |
1910 | ||
d62a17ae | 1911 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) |
33d022bc | 1912 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1913 | else |
33d022bc DA |
1914 | aggregator_as = stream_getw(peer->curr); |
1915 | ||
e8364238 DA |
1916 | attr->aggregator_as = aggregator_as; |
1917 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1918 | ||
33d022bc | 1919 | /* Codification of AS 0 Processing */ |
4877b70b | 1920 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1921 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1922 | "%s: AGGREGATOR AS number is 0 for aspath: %s", |
1923 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1924 | |
1925 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1926 | char attr_str[BUFSIZ] = {0}; | |
1927 | ||
1928 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1929 | ||
1930 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1931 | } | |
1932 | } else { | |
8085c9a7 | 1933 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); |
4877b70b | 1934 | } |
33d022bc | 1935 | |
d62a17ae | 1936 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1937 | |
1938 | aggregator_ignore: | |
1939 | stream_forward_getp(peer->curr, length); | |
1940 | ||
1941 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1942 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
1943 | lookup_msg(attr_str, args->type, NULL)); | |
1944 | ||
1945 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1946 | } |
1947 | ||
0b2aa3a0 | 1948 | /* New Aggregator attribute */ |
79288e4c | 1949 | static enum bgp_attr_parse_ret |
d62a17ae | 1950 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1951 | as_t *as4_aggregator_as, | |
1952 | struct in_addr *as4_aggregator_addr) | |
1953 | { | |
1954 | struct peer *const peer = args->peer; | |
1955 | struct attr *const attr = args->attr; | |
1956 | const bgp_size_t length = args->length; | |
33d022bc | 1957 | as_t aggregator_as; |
d62a17ae | 1958 | |
1959 | if (length != 8) { | |
1c50c1c0 QY |
1960 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1961 | length); | |
d62a17ae | 1962 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1963 | 0); | |
1964 | } | |
1965 | ||
a5c6a9b1 DA |
1966 | if (peer->discard_attrs[args->type]) |
1967 | goto as4_aggregator_ignore; | |
1968 | ||
33d022bc | 1969 | aggregator_as = stream_getl(peer->curr); |
0f2a703d | 1970 | |
e8364238 DA |
1971 | *as4_aggregator_as = aggregator_as; |
1972 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1973 | ||
0f2a703d | 1974 | /* Codification of AS 0 Processing */ |
4877b70b | 1975 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1976 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1977 | "%s: AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1978 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1979 | |
1980 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1981 | char attr_str[BUFSIZ] = {0}; | |
1982 | ||
1983 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1984 | ||
1985 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1986 | } | |
1987 | } else { | |
8085c9a7 | 1988 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); |
4877b70b | 1989 | } |
33d022bc | 1990 | |
d62a17ae | 1991 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1992 | |
1993 | as4_aggregator_ignore: | |
1994 | stream_forward_getp(peer->curr, length); | |
1995 | ||
1996 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1997 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
1998 | lookup_msg(attr_str, args->type, NULL)); | |
1999 | ||
2000 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
2001 | } |
2002 | ||
2003 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
2004 | */ | |
79288e4c | 2005 | static enum bgp_attr_parse_ret |
d62a17ae | 2006 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
2007 | struct aspath *as4_path, as_t as4_aggregator, | |
2008 | struct in_addr *as4_aggregator_addr) | |
2009 | { | |
2010 | int ignore_as4_path = 0; | |
2011 | struct aspath *newpath; | |
2012 | ||
2013 | if (!attr->aspath) { | |
2014 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
2015 | * have | |
2016 | * checked that all well-known, mandatory attributes were | |
2017 | * present. | |
2018 | * | |
2019 | * Can only be a problem with peer itself - hard error | |
2020 | */ | |
2021 | return BGP_ATTR_PARSE_ERROR; | |
2022 | } | |
2023 | ||
2024 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
2025 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
2026 | * if given. | |
2027 | * It is worth a warning though, because the peer really | |
2028 | * should not send them | |
2029 | */ | |
2030 | if (BGP_DEBUG(as4, AS4)) { | |
2031 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
2032 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
2033 | "AS4 capable peer, yet it sent"); | |
2034 | ||
2035 | if (attr->flag | |
2036 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
2037 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
2038 | peer->host, | |
2039 | "AS4 capable peer, yet it sent"); | |
2040 | } | |
2041 | ||
2042 | return BGP_ATTR_PARSE_PROCEED; | |
2043 | } | |
2044 | ||
2045 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
2046 | * because that may override AS4_PATH | |
2047 | */ | |
2048 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
2049 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
2050 | /* received both. | |
2051 | * if the as_number in aggregator is not AS_TRANS, | |
2052 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
2053 | * and the Aggregator shall be taken as | |
2054 | * info on the aggregating node, and the AS_PATH | |
2055 | * shall be taken as the AS_PATH | |
2056 | * otherwise | |
2057 | * the Aggregator shall be ignored and the | |
2058 | * AS4_AGGREGATOR shall be taken as the | |
2059 | * Aggregating node and the AS_PATH is to be | |
2060 | * constructed "as in all other cases" | |
2061 | */ | |
2062 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
2063 | /* ignore */ | |
2064 | if (BGP_DEBUG(as4, AS4)) | |
2065 | zlog_debug( | |
3efd0893 | 2066 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 2067 | peer->host); |
2068 | ignore_as4_path = 1; | |
2069 | } else { | |
2070 | /* "New_aggregator shall be taken as aggregator" | |
2071 | */ | |
2072 | attr->aggregator_as = as4_aggregator; | |
2073 | attr->aggregator_addr.s_addr = | |
2074 | as4_aggregator_addr->s_addr; | |
2075 | } | |
2076 | } else { | |
2077 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
2078 | * That is bogus - but reading the conditions | |
2079 | * we have to handle AS4_AGGREGATOR as if it were | |
2080 | * AGGREGATOR in that case | |
2081 | */ | |
2082 | if (BGP_DEBUG(as4, AS4)) | |
2083 | zlog_debug( | |
3efd0893 | 2084 | "[AS4] %s BGP not AS4 capable peer send AS4_AGGREGATOR but no AGGREGATOR, will take it as if AGGREGATOR with AS_TRANS had been there", |
d62a17ae | 2085 | peer->host); |
2086 | attr->aggregator_as = as4_aggregator; | |
2087 | /* sweep it under the carpet and simulate a "good" | |
2088 | * AGGREGATOR */ | |
2089 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
2094 | if (!ignore_as4_path | |
2095 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
2096 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 2097 | if (!newpath) |
2098 | return BGP_ATTR_PARSE_ERROR; | |
2099 | ||
d62a17ae | 2100 | aspath_unintern(&attr->aspath); |
2101 | attr->aspath = aspath_intern(newpath); | |
2102 | } | |
2103 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
2104 | } |
2105 | ||
718e3744 | 2106 | /* Community attribute. */ |
79288e4c | 2107 | static enum bgp_attr_parse_ret |
d62a17ae | 2108 | bgp_attr_community(struct bgp_attr_parser_args *args) |
2109 | { | |
2110 | struct peer *const peer = args->peer; | |
2111 | struct attr *const attr = args->attr; | |
2112 | const bgp_size_t length = args->length; | |
2113 | ||
2114 | if (length == 0) { | |
9a706b42 | 2115 | bgp_attr_set_community(attr, NULL); |
6680b550 DA |
2116 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2117 | args->total); | |
d62a17ae | 2118 | } |
2119 | ||
a5c6a9b1 DA |
2120 | if (peer->discard_attrs[args->type]) |
2121 | goto community_ignore; | |
2122 | ||
9a706b42 DA |
2123 | bgp_attr_set_community( |
2124 | attr, | |
2125 | community_parse((uint32_t *)stream_pnt(peer->curr), length)); | |
d62a17ae | 2126 | |
2127 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 2128 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2129 | |
4ba5a9c5 DA |
2130 | /* The Community attribute SHALL be considered malformed if its |
2131 | * length is not a non-zero multiple of 4. | |
2132 | */ | |
9a706b42 | 2133 | if (!bgp_attr_get_community(attr)) |
d62a17ae | 2134 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2135 | args->total); | |
2136 | ||
d62a17ae | 2137 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2138 | |
2139 | community_ignore: | |
2140 | stream_forward_getp(peer->curr, length); | |
2141 | ||
2142 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2143 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
2144 | lookup_msg(attr_str, args->type, NULL)); | |
2145 | ||
2146 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2147 | } |
2148 | ||
2149 | /* Originator ID attribute. */ | |
79288e4c | 2150 | static enum bgp_attr_parse_ret |
d62a17ae | 2151 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 2152 | { |
d62a17ae | 2153 | struct peer *const peer = args->peer; |
2154 | struct attr *const attr = args->attr; | |
2155 | const bgp_size_t length = args->length; | |
718e3744 | 2156 | |
4ba5a9c5 DA |
2157 | /* if received from an internal neighbor, it SHALL be considered |
2158 | * malformed if its length is not equal to 4. If malformed, the | |
2159 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
2160 | * withdraw". | |
2161 | */ | |
d62a17ae | 2162 | if (length != 4) { |
e50f7cfd | 2163 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 2164 | length); |
718e3744 | 2165 | |
d62a17ae | 2166 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2167 | args->total); | |
2168 | } | |
2169 | ||
a5c6a9b1 DA |
2170 | if (peer->discard_attrs[args->type]) |
2171 | goto originator_id_ignore; | |
2172 | ||
424ab01d | 2173 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 2174 | |
d62a17ae | 2175 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 2176 | |
d62a17ae | 2177 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2178 | |
2179 | originator_id_ignore: | |
2180 | stream_forward_getp(peer->curr, length); | |
2181 | ||
2182 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2183 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
2184 | lookup_msg(attr_str, args->type, NULL)); | |
2185 | ||
2186 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2187 | } |
2188 | ||
2189 | /* Cluster list attribute. */ | |
79288e4c | 2190 | static enum bgp_attr_parse_ret |
d62a17ae | 2191 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 2192 | { |
d62a17ae | 2193 | struct peer *const peer = args->peer; |
2194 | struct attr *const attr = args->attr; | |
2195 | const bgp_size_t length = args->length; | |
2196 | ||
4ba5a9c5 DA |
2197 | /* if received from an internal neighbor, it SHALL be considered |
2198 | * malformed if its length is not a non-zero multiple of 4. If | |
2199 | * malformed, the UPDATE message SHALL be handled using the approach | |
2200 | * of "treat-as-withdraw". | |
2201 | */ | |
33ba22c2 | 2202 | if (length == 0 || length % 4) { |
1c50c1c0 | 2203 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 2204 | |
d62a17ae | 2205 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2206 | args->total); | |
2207 | } | |
2208 | ||
a5c6a9b1 DA |
2209 | if (peer->discard_attrs[args->type]) |
2210 | goto cluster_list_ignore; | |
2211 | ||
779fee93 DS |
2212 | bgp_attr_set_cluster( |
2213 | attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr), | |
2214 | length)); | |
718e3744 | 2215 | |
d62a17ae | 2216 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 2217 | stream_forward_getp(peer->curr, length); |
718e3744 | 2218 | |
d62a17ae | 2219 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 2220 | |
d62a17ae | 2221 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2222 | |
2223 | cluster_list_ignore: | |
2224 | stream_forward_getp(peer->curr, length); | |
2225 | ||
2226 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2227 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
2228 | lookup_msg(attr_str, args->type, NULL)); | |
2229 | ||
2230 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2231 | } |
2232 | ||
2233 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 2234 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
2235 | struct bgp_nlri *mp_update) | |
2236 | { | |
2237 | iana_afi_t pkt_afi; | |
2238 | afi_t afi; | |
5c525538 RW |
2239 | iana_safi_t pkt_safi; |
2240 | safi_t safi; | |
d62a17ae | 2241 | bgp_size_t nlri_len; |
2242 | size_t start; | |
2243 | struct stream *s; | |
2244 | struct peer *const peer = args->peer; | |
2245 | struct attr *const attr = args->attr; | |
2246 | const bgp_size_t length = args->length; | |
2247 | ||
2248 | /* Set end of packet. */ | |
2249 | s = BGP_INPUT(peer); | |
2250 | start = stream_get_getp(s); | |
2251 | ||
2252 | /* safe to read statically sized header? */ | |
6e4ab12f | 2253 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 2254 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 2255 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
2256 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
2257 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 2258 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2259 | } | |
2260 | ||
2261 | /* Load AFI, SAFI. */ | |
2262 | pkt_afi = stream_getw(s); | |
2263 | pkt_safi = stream_getc(s); | |
2264 | ||
2265 | /* Convert AFI, SAFI to internal values, check. */ | |
2266 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2267 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2268 | * unless | |
2269 | * the attribute is otherwise malformed. | |
2270 | */ | |
2271 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2272 | zlog_debug( | |
4cb5e18b | 2273 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
2274 | peer->host, iana_afi2str(pkt_afi), |
2275 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2276 | return BGP_ATTR_PARSE_ERROR; |
2277 | } | |
2278 | ||
2279 | /* Get nexthop length. */ | |
2280 | attr->mp_nexthop_len = stream_getc(s); | |
2281 | ||
2282 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
2283 | zlog_info( | |
4cb5e18b | 2284 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 2285 | __func__, peer->host, attr->mp_nexthop_len); |
2286 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2287 | } | |
2288 | ||
2289 | /* Nexthop length check. */ | |
2290 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2291 | case 0: |
2292 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2293 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2294 | __func__, peer->host, attr->mp_nexthop_len); |
2295 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2296 | } | |
2297 | break; | |
b6453163 LB |
2298 | case BGP_ATTR_NHLEN_VPNV4: |
2299 | stream_getl(s); /* RD high */ | |
2300 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2301 | /* |
2302 | * NOTE: intentional fall through | |
2303 | * - for consistency in rx processing | |
2304 | * | |
2305 | * The following comment is to signal GCC this intention | |
0437e105 | 2306 | * and suppress the warning |
996c9314 LB |
2307 | */ |
2308 | /* FALLTHRU */ | |
d62a17ae | 2309 | case BGP_ATTR_NHLEN_IPV4: |
2310 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2311 | /* Probably needed for RFC 2283 */ | |
975a328e | 2312 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2313 | memcpy(&attr->nexthop.s_addr, |
2314 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2315 | break; | |
d62a17ae | 2316 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2317 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2318 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2319 | stream_getl(s); /* RD high */ | |
2320 | stream_getl(s); /* RD low */ | |
2321 | } | |
2322 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2323 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2324 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2325 | zlog_warn("%s sent a v6 global attribute but address is a V6 LL and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2326 | peer->host); |
2327 | return BGP_ATTR_PARSE_WITHDRAW; | |
2328 | } | |
77e62f2b | 2329 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2330 | } |
d62a17ae | 2331 | break; |
2332 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2333 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2334 | if (attr->mp_nexthop_len | |
2335 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2336 | stream_getl(s); /* RD high */ | |
2337 | stream_getl(s); /* RD low */ | |
2338 | } | |
2339 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2340 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2341 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2342 | zlog_warn("%s sent a v6 global and LL attribute but global address is a V6 LL and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2343 | peer->host); |
2344 | return BGP_ATTR_PARSE_WITHDRAW; | |
2345 | } | |
77e62f2b | 2346 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2347 | } |
d62a17ae | 2348 | if (attr->mp_nexthop_len |
2349 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2350 | stream_getl(s); /* RD high */ | |
2351 | stream_getl(s); /* RD low */ | |
2352 | } | |
2353 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2354 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
d62a17ae | 2355 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2356 | zlog_debug( | |
c0d72166 DS |
2357 | "%s sent next-hops %pI6 and %pI6. Ignoring non-LL value", |
2358 | peer->host, &attr->mp_nexthop_global, | |
2359 | &attr->mp_nexthop_local); | |
d62a17ae | 2360 | |
2361 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2362 | } | |
17cdd31e | 2363 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2364 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2365 | peer->host); |
2366 | return BGP_ATTR_PARSE_WITHDRAW; | |
2367 | } | |
77e62f2b | 2368 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2369 | break; |
2370 | default: | |
4cb5e18b | 2371 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2372 | __func__, peer->host, attr->mp_nexthop_len); |
2373 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2374 | } | |
2375 | ||
2376 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2377 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2378 | __func__, peer->host); | |
d62a17ae | 2379 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2380 | } | |
2381 | ||
718e3744 | 2382 | { |
d7c0a89a | 2383 | uint8_t val; |
d62a17ae | 2384 | if ((val = stream_getc(s))) |
ade6974d | 2385 | flog_warn( |
e50f7cfd | 2386 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2387 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2388 | peer->host, val); | |
d62a17ae | 2389 | } |
2390 | ||
2391 | /* must have nrli_len, what is left of the attribute */ | |
2392 | nlri_len = LEN_LEFT; | |
9b9df989 | 2393 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2394 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2395 | __func__, peer->host); | |
d62a17ae | 2396 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2397 | } | |
2398 | ||
9b9df989 | 2399 | if (!nlri_len) { |
4cb5e18b | 2400 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2401 | __func__, peer->host); |
2402 | ||
2403 | mp_update->afi = afi; | |
2404 | mp_update->safi = safi; | |
2405 | return BGP_ATTR_PARSE_EOR; | |
2406 | } | |
2407 | ||
d62a17ae | 2408 | mp_update->afi = afi; |
2409 | mp_update->safi = safi; | |
2410 | mp_update->nlri = stream_pnt(s); | |
2411 | mp_update->length = nlri_len; | |
2412 | ||
2413 | stream_forward_getp(s, nlri_len); | |
2414 | ||
2415 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2416 | ||
2417 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2418 | #undef LEN_LEFT |
718e3744 | 2419 | } |
2420 | ||
2421 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2422 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2423 | struct bgp_nlri *mp_withdraw) | |
2424 | { | |
2425 | struct stream *s; | |
2426 | iana_afi_t pkt_afi; | |
2427 | afi_t afi; | |
5c525538 RW |
2428 | iana_safi_t pkt_safi; |
2429 | safi_t safi; | |
d7c0a89a | 2430 | uint16_t withdraw_len; |
d62a17ae | 2431 | struct peer *const peer = args->peer; |
2432 | struct attr *const attr = args->attr; | |
2433 | const bgp_size_t length = args->length; | |
9cabb64b | 2434 | |
424ab01d | 2435 | s = peer->curr; |
9cabb64b | 2436 | |
d62a17ae | 2437 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2438 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2439 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2440 | ||
2441 | pkt_afi = stream_getw(s); | |
2442 | pkt_safi = stream_getc(s); | |
2443 | ||
2444 | /* Convert AFI, SAFI to internal values, check. */ | |
2445 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2446 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2447 | * unless | |
2448 | * the attribute is otherwise malformed. | |
2449 | */ | |
2450 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2451 | zlog_debug( | |
748a041f DS |
2452 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2453 | peer->host, iana_afi2str(pkt_afi), | |
2454 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2455 | return BGP_ATTR_PARSE_ERROR; |
2456 | } | |
718e3744 | 2457 | |
d62a17ae | 2458 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2459 | |
d62a17ae | 2460 | mp_withdraw->afi = afi; |
2461 | mp_withdraw->safi = safi; | |
2462 | mp_withdraw->nlri = stream_pnt(s); | |
2463 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2464 | |
d62a17ae | 2465 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2466 | |
d62a17ae | 2467 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2468 | ||
2469 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2470 | } |
2471 | ||
57d187bc | 2472 | /* Large Community attribute. */ |
79288e4c | 2473 | static enum bgp_attr_parse_ret |
d62a17ae | 2474 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2475 | { | |
2476 | struct peer *const peer = args->peer; | |
2477 | struct attr *const attr = args->attr; | |
2478 | const bgp_size_t length = args->length; | |
2479 | ||
2480 | /* | |
2481 | * Large community follows new attribute format. | |
2482 | */ | |
2483 | if (length == 0) { | |
1bcf3a96 | 2484 | bgp_attr_set_lcommunity(attr, NULL); |
d62a17ae | 2485 | /* Empty extcomm doesn't seem to be invalid per se */ |
6680b550 DA |
2486 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2487 | args->total); | |
d62a17ae | 2488 | } |
57d187bc | 2489 | |
a5c6a9b1 DA |
2490 | if (peer->discard_attrs[args->type]) |
2491 | goto large_community_ignore; | |
2492 | ||
1bcf3a96 DA |
2493 | bgp_attr_set_lcommunity( |
2494 | attr, lcommunity_parse(stream_pnt(peer->curr), length)); | |
d62a17ae | 2495 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2496 | stream_forward_getp(peer->curr, length); |
57d187bc | 2497 | |
1bcf3a96 | 2498 | if (!bgp_attr_get_lcommunity(attr)) |
d62a17ae | 2499 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2500 | args->total); | |
57d187bc | 2501 | |
d62a17ae | 2502 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2503 | |
2504 | large_community_ignore: | |
2505 | stream_forward_getp(peer->curr, length); | |
2506 | ||
2507 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2508 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
2509 | lookup_msg(attr_str, args->type, NULL)); | |
2510 | ||
2511 | return BGP_ATTR_PARSE_PROCEED; | |
57d187bc JS |
2512 | } |
2513 | ||
718e3744 | 2514 | /* Extended Community attribute. */ |
79288e4c | 2515 | static enum bgp_attr_parse_ret |
d62a17ae | 2516 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2517 | { | |
2518 | struct peer *const peer = args->peer; | |
2519 | struct attr *const attr = args->attr; | |
2520 | const bgp_size_t length = args->length; | |
d7c0a89a | 2521 | uint8_t sticky = 0; |
7904e9fd | 2522 | bool proxy = false; |
b53e67a3 | 2523 | struct ecommunity *ecomm; |
d62a17ae | 2524 | |
2525 | if (length == 0) { | |
b53e67a3 | 2526 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 2527 | /* Empty extcomm doesn't seem to be invalid per se */ |
6680b550 DA |
2528 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2529 | args->total); | |
d62a17ae | 2530 | } |
2531 | ||
b53e67a3 | 2532 | ecomm = ecommunity_parse( |
27aa23a4 DA |
2533 | stream_pnt(peer->curr), length, |
2534 | CHECK_FLAG(peer->flags, | |
2535 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
b53e67a3 | 2536 | bgp_attr_set_ecommunity(attr, ecomm); |
d62a17ae | 2537 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2538 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2539 | |
4ba5a9c5 DA |
2540 | /* The Extended Community attribute SHALL be considered malformed if |
2541 | * its length is not a non-zero multiple of 8. | |
2542 | */ | |
b53e67a3 | 2543 | if (!bgp_attr_get_ecommunity(attr)) |
d62a17ae | 2544 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2545 | args->total); | |
2546 | ||
74e2bd89 AK |
2547 | /* Extract DF election preference and mobility sequence number */ |
2548 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2549 | ||
d62a17ae | 2550 | /* Extract MAC mobility sequence number, if any. */ |
2551 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2552 | attr->sticky = sticky; | |
2553 | ||
ead40654 MK |
2554 | /* Check if this is a Gateway MAC-IP advertisement */ |
2555 | attr->default_gw = bgp_attr_default_gw(attr); | |
2556 | ||
68e33151 CS |
2557 | /* Handle scenario where router flag ecommunity is not |
2558 | * set but default gw ext community is present. | |
2559 | * Use default gateway, set and propogate R-bit. | |
2560 | */ | |
2561 | if (attr->default_gw) | |
2562 | attr->router_flag = 1; | |
2563 | ||
2564 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2565 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2566 | if (proxy) | |
2567 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2568 | |
bc59a672 | 2569 | /* Extract the Rmac, if any */ |
eee353c5 | 2570 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
c0d72166 DS |
2571 | if (bgp_debug_update(peer, NULL, NULL, 1) |
2572 | && bgp_mac_exist(&attr->rmac)) | |
2573 | zlog_debug("%s: router mac %pEA is self mac", __func__, | |
2574 | &attr->rmac); | |
eee353c5 | 2575 | } |
bc59a672 | 2576 | |
f4bd90c5 LK |
2577 | /* Get the tunnel type from encap extended community */ |
2578 | bgp_attr_extcom_tunnel_type(attr, | |
2579 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2580 | ||
d901dc13 | 2581 | /* Extract link bandwidth, if any. */ |
b53e67a3 DA |
2582 | (void)ecommunity_linkbw_present(bgp_attr_get_ecommunity(attr), |
2583 | &attr->link_bw); | |
d901dc13 | 2584 | |
d62a17ae | 2585 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2586 | } |
2587 | ||
9a659715 | 2588 | /* IPv6 Extended Community attribute. */ |
79288e4c | 2589 | static enum bgp_attr_parse_ret |
9a659715 PG |
2590 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) |
2591 | { | |
2592 | struct peer *const peer = args->peer; | |
2593 | struct attr *const attr = args->attr; | |
2594 | const bgp_size_t length = args->length; | |
d04ac434 | 2595 | struct ecommunity *ipv6_ecomm = NULL; |
9a659715 PG |
2596 | |
2597 | if (length == 0) { | |
d04ac434 | 2598 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
c6423c31 PG |
2599 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2600 | args->total); | |
9a659715 PG |
2601 | } |
2602 | ||
a5c6a9b1 DA |
2603 | if (peer->discard_attrs[args->type]) |
2604 | goto ipv6_ext_community_ignore; | |
2605 | ||
27aa23a4 DA |
2606 | ipv6_ecomm = ecommunity_parse_ipv6( |
2607 | stream_pnt(peer->curr), length, | |
2608 | CHECK_FLAG(peer->flags, | |
2609 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d04ac434 DS |
2610 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
2611 | ||
9a659715 PG |
2612 | /* XXX: fix ecommunity_parse to use stream API */ |
2613 | stream_forward_getp(peer->curr, length); | |
2614 | ||
d04ac434 | 2615 | if (!ipv6_ecomm) |
9a659715 PG |
2616 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2617 | args->total); | |
2618 | ||
9a659715 | 2619 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2620 | |
2621 | ipv6_ext_community_ignore: | |
2622 | stream_forward_getp(peer->curr, length); | |
2623 | ||
2624 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2625 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
2626 | lookup_msg(attr_str, args->type, NULL)); | |
2627 | ||
2628 | return BGP_ATTR_PARSE_PROCEED; | |
9a659715 PG |
2629 | } |
2630 | ||
f4c89855 | 2631 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2632 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2633 | bgp_size_t length, /* IN: attr's length field */ | |
2634 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2635 | uint8_t flag, /* IN: attr's flags field */ |
2636 | uint8_t *startp) | |
d62a17ae | 2637 | { |
2638 | bgp_size_t total; | |
d62a17ae | 2639 | uint16_t tunneltype = 0; |
2640 | ||
2641 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2642 | ||
2643 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2644 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2645 | zlog_info( | |
2646 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2647 | flag); | |
2648 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2649 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2650 | startp, total); | |
2651 | return -1; | |
2652 | } | |
2653 | ||
2654 | if (BGP_ATTR_ENCAP == type) { | |
2655 | /* read outer TLV type and length */ | |
2656 | uint16_t tlv_length; | |
2657 | ||
2658 | if (length < 4) { | |
2659 | zlog_info( | |
2660 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2661 | bgp_notify_send_with_data( | |
2662 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2663 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2664 | return -1; | |
2665 | } | |
2666 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2667 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2668 | length -= 4; | |
2669 | ||
2670 | if (tlv_length != length) { | |
4cb5e18b NT |
2671 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2672 | __func__, tlv_length, length); | |
d62a17ae | 2673 | } |
2674 | } | |
2675 | ||
2676 | while (length >= 4) { | |
2677 | uint16_t subtype = 0; | |
2678 | uint16_t sublength = 0; | |
2679 | struct bgp_attr_encap_subtlv *tlv; | |
2680 | ||
2681 | if (BGP_ATTR_ENCAP == type) { | |
2682 | subtype = stream_getc(BGP_INPUT(peer)); | |
2683 | sublength = stream_getc(BGP_INPUT(peer)); | |
2684 | length -= 2; | |
1e20238a | 2685 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2686 | } else { |
2687 | subtype = stream_getw(BGP_INPUT(peer)); | |
2688 | sublength = stream_getw(BGP_INPUT(peer)); | |
2689 | length -= 4; | |
65efcfce | 2690 | #endif |
d62a17ae | 2691 | } |
2692 | ||
2693 | if (sublength > length) { | |
2694 | zlog_info( | |
2695 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2696 | sublength, length); | |
2697 | bgp_notify_send_with_data( | |
2698 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2699 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2700 | return -1; | |
2701 | } | |
2702 | ||
2703 | /* alloc and copy sub-tlv */ | |
2704 | /* TBD make sure these are freed when attributes are released */ | |
2705 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2706 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2707 | tlv->type = subtype; |
2708 | tlv->length = sublength; | |
424ab01d | 2709 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2710 | length -= sublength; |
2711 | ||
2712 | /* attach tlv to encap chain */ | |
2713 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2714 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2715 | for (stlv_last = attr->encap_subtlvs; |
2716 | stlv_last && stlv_last->next; | |
2717 | stlv_last = stlv_last->next) | |
2718 | ; | |
2719 | if (stlv_last) { | |
2720 | stlv_last->next = tlv; | |
2721 | } else { | |
2722 | attr->encap_subtlvs = tlv; | |
2723 | } | |
1e20238a | 2724 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2725 | } else { |
e4002056 | 2726 | struct bgp_attr_encap_subtlv *stlv_last; |
91ebf12c DS |
2727 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
2728 | bgp_attr_get_vnc_subtlvs(attr); | |
2729 | ||
2730 | for (stlv_last = vnc_subtlvs; | |
d62a17ae | 2731 | stlv_last && stlv_last->next; |
2732 | stlv_last = stlv_last->next) | |
2733 | ; | |
91ebf12c | 2734 | if (stlv_last) |
d62a17ae | 2735 | stlv_last->next = tlv; |
91ebf12c DS |
2736 | else |
2737 | bgp_attr_set_vnc_subtlvs(attr, tlv); | |
aadc0905 | 2738 | #endif |
d62a17ae | 2739 | } |
d62a17ae | 2740 | } |
f4c89855 | 2741 | |
d62a17ae | 2742 | if (BGP_ATTR_ENCAP == type) { |
2743 | attr->encap_tunneltype = tunneltype; | |
2744 | } | |
f4c89855 | 2745 | |
d62a17ae | 2746 | if (length) { |
2747 | /* spurious leftover data */ | |
2748 | zlog_info( | |
2749 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2750 | length); | |
2751 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2752 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2753 | startp, total); | |
2754 | return -1; | |
2755 | } | |
f4c89855 | 2756 | |
d62a17ae | 2757 | return 0; |
f4c89855 LB |
2758 | } |
2759 | ||
73604f82 RS |
2760 | |
2761 | /* SRv6 Service Data Sub-Sub-TLV attribute | |
2762 | * draft-ietf-bess-srv6-services-07 | |
2763 | */ | |
79288e4c | 2764 | static enum bgp_attr_parse_ret |
73604f82 RS |
2765 | bgp_attr_srv6_service_data(struct bgp_attr_parser_args *args) |
2766 | { | |
2767 | struct peer *const peer = args->peer; | |
9299fd00 | 2768 | struct attr *const attr = args->attr; |
73604f82 RS |
2769 | uint8_t type, loc_block_len, loc_node_len, func_len, arg_len, |
2770 | transposition_len, transposition_offset; | |
2771 | uint16_t length; | |
2772 | size_t headersz = sizeof(type) + sizeof(length); | |
2773 | ||
2774 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2775 | flog_err( | |
2776 | EC_BGP_ATTR_LEN, | |
2777 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2778 | headersz, STREAM_READABLE(peer->curr)); | |
2779 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2780 | args->total); | |
2781 | } | |
2782 | ||
2783 | type = stream_getc(peer->curr); | |
2784 | length = stream_getw(peer->curr); | |
2785 | ||
2786 | if (STREAM_READABLE(peer->curr) < length) { | |
2787 | flog_err( | |
2788 | EC_BGP_ATTR_LEN, | |
2789 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2790 | length, STREAM_READABLE(peer->curr)); | |
2791 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2792 | args->total); | |
2793 | } | |
2794 | ||
5c111a25 DS |
2795 | if (length < BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH) { |
2796 | flog_err( | |
2797 | EC_BGP_ATTR_LEN, | |
c5fa4459 | 2798 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficient data (need %u, have %hu remaining in UPDATE)", |
5c111a25 DS |
2799 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH, |
2800 | length); | |
2801 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2802 | args->total); | |
2803 | } | |
2804 | ||
73604f82 | 2805 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE) { |
bc32d950 DS |
2806 | if (STREAM_READABLE(peer->curr) < |
2807 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH) { | |
2808 | flog_err( | |
2809 | EC_BGP_ATTR_LEN, | |
2810 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficient data (need %u, have %zu remaining in UPDATE)", | |
2811 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH, | |
2812 | STREAM_READABLE(peer->curr)); | |
2813 | return bgp_attr_malformed( | |
2814 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2815 | args->total); | |
2816 | } | |
2817 | ||
73604f82 RS |
2818 | loc_block_len = stream_getc(peer->curr); |
2819 | loc_node_len = stream_getc(peer->curr); | |
2820 | func_len = stream_getc(peer->curr); | |
2821 | arg_len = stream_getc(peer->curr); | |
2822 | transposition_len = stream_getc(peer->curr); | |
2823 | transposition_offset = stream_getc(peer->curr); | |
2824 | ||
2825 | /* Log SRv6 Service Data Sub-Sub-TLV */ | |
2826 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2827 | zlog_debug( | |
2828 | "%s: srv6-l3-srv-data loc-block-len=%u, loc-node-len=%u func-len=%u, arg-len=%u, transposition-len=%u, transposition-offset=%u", | |
2829 | __func__, loc_block_len, loc_node_len, func_len, | |
2830 | arg_len, transposition_len, | |
2831 | transposition_offset); | |
2832 | } | |
9299fd00 RS |
2833 | |
2834 | attr->srv6_l3vpn->loc_block_len = loc_block_len; | |
2835 | attr->srv6_l3vpn->loc_node_len = loc_node_len; | |
2836 | attr->srv6_l3vpn->func_len = func_len; | |
2837 | attr->srv6_l3vpn->arg_len = arg_len; | |
2838 | attr->srv6_l3vpn->transposition_len = transposition_len; | |
2839 | attr->srv6_l3vpn->transposition_offset = transposition_offset; | |
73604f82 RS |
2840 | } |
2841 | ||
2842 | else { | |
2843 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2844 | zlog_debug( | |
2845 | "%s attr SRv6 Service Data Sub-Sub-TLV sub-sub-type=%u is not supported, skipped", | |
2846 | peer->host, type); | |
2847 | ||
2848 | stream_forward_getp(peer->curr, length); | |
2849 | } | |
2850 | ||
2851 | return BGP_ATTR_PARSE_PROCEED; | |
2852 | } | |
2853 | ||
2854 | /* SRv6 Service Sub-TLV attribute | |
2855 | * draft-ietf-bess-srv6-services-07 | |
2856 | */ | |
79288e4c | 2857 | static enum bgp_attr_parse_ret |
73604f82 RS |
2858 | bgp_attr_srv6_service(struct bgp_attr_parser_args *args) |
2859 | { | |
2860 | struct peer *const peer = args->peer; | |
2861 | struct attr *const attr = args->attr; | |
2862 | struct in6_addr ipv6_sid; | |
2863 | uint8_t type, sid_flags; | |
2864 | uint16_t length, endpoint_behavior; | |
2865 | size_t headersz = sizeof(type) + sizeof(length); | |
79288e4c | 2866 | enum bgp_attr_parse_ret err; |
73604f82 RS |
2867 | |
2868 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2869 | flog_err( | |
2870 | EC_BGP_ATTR_LEN, | |
2871 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2872 | headersz, STREAM_READABLE(peer->curr)); | |
2873 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2874 | args->total); | |
2875 | } | |
2876 | ||
2877 | type = stream_getc(peer->curr); | |
2878 | length = stream_getw(peer->curr); | |
2879 | ||
2880 | if (STREAM_READABLE(peer->curr) < length) { | |
2881 | flog_err( | |
2882 | EC_BGP_ATTR_LEN, | |
2883 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2884 | length, STREAM_READABLE(peer->curr)); | |
2885 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2886 | args->total); | |
2887 | } | |
2888 | ||
2889 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO) { | |
bc32d950 DS |
2890 | if (STREAM_READABLE(peer->curr) < |
2891 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { | |
2892 | flog_err( | |
2893 | EC_BGP_ATTR_LEN, | |
2894 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %d for attribute data, have %zu remaining in UPDATE)", | |
2895 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH, | |
2896 | STREAM_READABLE(peer->curr)); | |
2897 | return bgp_attr_malformed( | |
2898 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2899 | args->total); | |
2900 | } | |
73604f82 RS |
2901 | stream_getc(peer->curr); |
2902 | stream_get(&ipv6_sid, peer->curr, sizeof(ipv6_sid)); | |
2903 | sid_flags = stream_getc(peer->curr); | |
2904 | endpoint_behavior = stream_getw(peer->curr); | |
2905 | stream_getc(peer->curr); | |
2906 | ||
2907 | /* Log SRv6 Service Sub-TLV */ | |
07380148 | 2908 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) |
73604f82 | 2909 | zlog_debug( |
07380148 DA |
2910 | "%s: srv6-l3-srv sid %pI6, sid-flags 0x%02x, end-behaviour 0x%04x", |
2911 | __func__, &ipv6_sid, sid_flags, | |
2912 | endpoint_behavior); | |
73604f82 RS |
2913 | |
2914 | /* Configure from Info */ | |
2915 | if (attr->srv6_l3vpn) { | |
2916 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2917 | "Prefix SID SRv6 L3VPN field repeated"); | |
2918 | return bgp_attr_malformed( | |
2919 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2920 | } | |
2921 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, | |
2922 | sizeof(struct bgp_attr_srv6_l3vpn)); | |
9299fd00 | 2923 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); |
73604f82 RS |
2924 | attr->srv6_l3vpn->sid_flags = sid_flags; |
2925 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
9299fd00 RS |
2926 | attr->srv6_l3vpn->loc_block_len = 0; |
2927 | attr->srv6_l3vpn->loc_node_len = 0; | |
2928 | attr->srv6_l3vpn->func_len = 0; | |
2929 | attr->srv6_l3vpn->arg_len = 0; | |
2930 | attr->srv6_l3vpn->transposition_len = 0; | |
2931 | attr->srv6_l3vpn->transposition_offset = 0; | |
73604f82 RS |
2932 | |
2933 | // Sub-Sub-TLV found | |
9299fd00 RS |
2934 | if (length > BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { |
2935 | err = bgp_attr_srv6_service_data(args); | |
2936 | ||
2937 | if (err != BGP_ATTR_PARSE_PROCEED) | |
2938 | return err; | |
2939 | } | |
2940 | ||
2941 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
73604f82 RS |
2942 | } |
2943 | ||
2944 | /* Placeholder code for unsupported type */ | |
2945 | else { | |
2946 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2947 | zlog_debug( | |
2948 | "%s attr SRv6 Service Sub-TLV sub-type=%u is not supported, skipped", | |
2949 | peer->host, type); | |
2950 | ||
2951 | stream_forward_getp(peer->curr, length); | |
2952 | } | |
2953 | ||
2954 | return BGP_ATTR_PARSE_PROCEED; | |
2955 | } | |
2956 | ||
30adbd4e DS |
2957 | /* |
2958 | * Read an individual SID value returning how much data we have read | |
2959 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2960 | */ |
79288e4c DA |
2961 | static enum bgp_attr_parse_ret |
2962 | bgp_attr_psid_sub(uint8_t type, uint16_t length, | |
2963 | struct bgp_attr_parser_args *args) | |
d62a17ae | 2964 | { |
2965 | struct peer *const peer = args->peer; | |
2966 | struct attr *const attr = args->attr; | |
d7c0a89a | 2967 | uint32_t label_index; |
d62a17ae | 2968 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2969 | uint32_t srgb_base; |
2970 | uint32_t srgb_range; | |
d62a17ae | 2971 | int srgb_count; |
e496b420 | 2972 | uint8_t sid_type, sid_flags; |
d62a17ae | 2973 | |
d62a17ae | 2974 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2975 | if (STREAM_READABLE(peer->curr) < length |
2976 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2977 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2978 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2979 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2980 | return bgp_attr_malformed(args, |
2981 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2982 | args->total); | |
d62a17ae | 2983 | } |
2984 | ||
2985 | /* Ignore flags and reserved */ | |
424ab01d QY |
2986 | stream_getc(peer->curr); |
2987 | stream_getw(peer->curr); | |
d62a17ae | 2988 | |
2989 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2990 | label_index = stream_getl(peer->curr); |
d62a17ae | 2991 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2992 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2993 | args->total); | |
d62a17ae | 2994 | |
2995 | /* Store label index; subsequently, we'll check on | |
2996 | * address-family */ | |
2997 | attr->label_index = label_index; | |
d62a17ae | 2998 | } |
2999 | ||
3000 | /* Placeholder code for the IPv6 SID type */ | |
3001 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
3002 | if (STREAM_READABLE(peer->curr) < length |
3003 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 3004 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 3005 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 3006 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
3007 | return bgp_attr_malformed(args, |
3008 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3009 | args->total); | |
d62a17ae | 3010 | } |
3011 | ||
3012 | /* Ignore reserved */ | |
424ab01d QY |
3013 | stream_getc(peer->curr); |
3014 | stream_getw(peer->curr); | |
d62a17ae | 3015 | |
424ab01d | 3016 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 3017 | } |
3018 | ||
3019 | /* Placeholder code for the Originator SRGB type */ | |
3020 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
3021 | /* |
3022 | * ietf-idr-bgp-prefix-sid-05: | |
3023 | * Length is the total length of the value portion of the | |
3024 | * TLV: 2 + multiple of 6. | |
3025 | * | |
3026 | * peer->curr stream readp should be at the beginning of the 16 | |
3027 | * bit flag field at this point in the code. | |
3028 | */ | |
d62a17ae | 3029 | |
473046ee QY |
3030 | /* |
3031 | * Check that the TLV length field is sane: at least 2 bytes of | |
3032 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
3033 | */ | |
3034 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
3035 | flog_err( | |
3036 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 3037 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
3038 | length, |
3039 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
3040 | return bgp_attr_malformed( | |
3041 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3042 | args->total); | |
3043 | } | |
d62a17ae | 3044 | |
473046ee QY |
3045 | /* |
3046 | * Check that we actually have at least as much data as | |
3047 | * specified by the length field | |
3048 | */ | |
3049 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 3050 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 3051 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 3052 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
3053 | return bgp_attr_malformed( |
3054 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3055 | args->total); | |
3056 | } | |
3057 | ||
473046ee QY |
3058 | /* |
3059 | * Check that the portion of the TLV containing the sequence of | |
3060 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
3061 | * that length, we skip the 16 bit flags field | |
3062 | */ | |
424ab01d | 3063 | stream_getw(peer->curr); |
d62a17ae | 3064 | length -= 2; |
d62a17ae | 3065 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 3066 | flog_err( |
e50f7cfd | 3067 | EC_BGP_ATTR_LEN, |
6cde4b45 | 3068 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 3069 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
3070 | return bgp_attr_malformed( | |
3071 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3072 | args->total); | |
3073 | } | |
3074 | ||
3075 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
3076 | ||
3077 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
3078 | stream_get(&srgb_base, peer->curr, 3); |
3079 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 3080 | } |
3081 | } | |
3082 | ||
e496b420 HS |
3083 | /* Placeholder code for the VPN-SID Service type */ |
3084 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
3085 | if (STREAM_READABLE(peer->curr) < length | |
3086 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
3087 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 3088 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
3089 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
3090 | return bgp_attr_malformed(args, | |
3091 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3092 | args->total); | |
3093 | } | |
3094 | ||
3095 | /* Parse VPN-SID Sub-TLV */ | |
3096 | stream_getc(peer->curr); /* reserved */ | |
3097 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
3098 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
3099 | stream_get(&ipv6_sid, peer->curr, | |
3100 | sizeof(ipv6_sid)); /* sid_value */ | |
3101 | ||
3102 | /* Log VPN-SID Sub-TLV */ | |
07380148 | 3103 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) |
e496b420 | 3104 | zlog_debug( |
07380148 DA |
3105 | "%s: vpn-sid: sid %pI6, sid-type 0x%02x sid-flags 0x%02x", |
3106 | __func__, &ipv6_sid, sid_type, sid_flags); | |
e496b420 HS |
3107 | |
3108 | /* Configure from Info */ | |
b502ca11 QY |
3109 | if (attr->srv6_vpn) { |
3110 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
3111 | "Prefix SID SRv6 VPN field repeated"); | |
3112 | return bgp_attr_malformed( | |
3113 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
3114 | } | |
340594a9 | 3115 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 3116 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
3117 | attr->srv6_vpn->sid_flags = sid_flags; |
3118 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
b83127e1 | 3119 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); |
e496b420 HS |
3120 | } |
3121 | ||
3122 | /* Placeholder code for the SRv6 L3 Service type */ | |
3123 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
73604f82 RS |
3124 | if (STREAM_READABLE(peer->curr) < length) { |
3125 | flog_err( | |
3126 | EC_BGP_ATTR_LEN, | |
3127 | "Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain", | |
3128 | length, STREAM_READABLE(peer->curr)); | |
e496b420 HS |
3129 | return bgp_attr_malformed(args, |
3130 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3131 | args->total); | |
3132 | } | |
3133 | ||
73604f82 RS |
3134 | /* ignore reserved */ |
3135 | stream_getc(peer->curr); | |
e496b420 | 3136 | |
73604f82 | 3137 | return bgp_attr_srv6_service(args); |
e496b420 HS |
3138 | } |
3139 | ||
3140 | /* Placeholder code for Unsupported TLV */ | |
3141 | else { | |
f69aeb76 QY |
3142 | |
3143 | if (STREAM_READABLE(peer->curr) < length) { | |
3144 | flog_err( | |
3145 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 3146 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
3147 | length, STREAM_READABLE(peer->curr)); |
3148 | return bgp_attr_malformed( | |
3149 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3150 | args->total); | |
3151 | } | |
3152 | ||
c6ca155d HS |
3153 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3154 | zlog_debug( | |
3155 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
3156 | peer->host, type); | |
f69aeb76 QY |
3157 | |
3158 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
3159 | } |
3160 | ||
d62a17ae | 3161 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
3162 | } |
3163 | ||
30adbd4e DS |
3164 | /* Prefix SID attribute |
3165 | * draft-ietf-idr-bgp-prefix-sid-05 | |
3166 | */ | |
79288e4c | 3167 | enum bgp_attr_parse_ret bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
3168 | { |
3169 | struct peer *const peer = args->peer; | |
3170 | struct attr *const attr = args->attr; | |
79288e4c | 3171 | enum bgp_attr_parse_ret ret; |
30adbd4e DS |
3172 | |
3173 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
3174 | ||
f69aeb76 QY |
3175 | uint8_t type; |
3176 | uint16_t length; | |
3177 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 3178 | size_t psid_parsed_length = 0; |
30adbd4e | 3179 | |
38774fc5 HS |
3180 | while (STREAM_READABLE(peer->curr) > 0 |
3181 | && psid_parsed_length < args->length) { | |
30adbd4e | 3182 | |
f69aeb76 QY |
3183 | if (STREAM_READABLE(peer->curr) < headersz) { |
3184 | flog_err( | |
3185 | EC_BGP_ATTR_LEN, | |
3186 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
3187 | headersz, STREAM_READABLE(peer->curr)); | |
3188 | return bgp_attr_malformed( | |
3189 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3190 | args->total); | |
3191 | } | |
30adbd4e | 3192 | |
f69aeb76 QY |
3193 | type = stream_getc(peer->curr); |
3194 | length = stream_getw(peer->curr); | |
30adbd4e | 3195 | |
f69aeb76 | 3196 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 3197 | flog_err( |
e50f7cfd | 3198 | EC_BGP_ATTR_LEN, |
6cde4b45 | 3199 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 3200 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
3201 | return bgp_attr_malformed(args, |
3202 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3203 | args->total); | |
3204 | } | |
f69aeb76 | 3205 | |
45a06b11 | 3206 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
3207 | |
3208 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
3209 | return ret; | |
38774fc5 HS |
3210 | |
3211 | psid_parsed_length += length + headersz; | |
3212 | ||
3213 | if (psid_parsed_length > args->length) { | |
3214 | flog_err( | |
3215 | EC_BGP_ATTR_LEN, | |
3efd0893 | 3216 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
3217 | length + headersz, psid_parsed_length - (length + headersz)); |
3218 | return bgp_attr_malformed( | |
3219 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3220 | args->total); | |
3221 | } | |
30adbd4e DS |
3222 | } |
3223 | ||
3224 | return BGP_ATTR_PARSE_PROCEED; | |
3225 | } | |
3226 | ||
7fd077aa | 3227 | /* PMSI tunnel attribute (RFC 6514) |
3228 | * Basic validation checks done here. | |
3229 | */ | |
79288e4c | 3230 | static enum bgp_attr_parse_ret |
7fd077aa | 3231 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) |
3232 | { | |
3233 | struct peer *const peer = args->peer; | |
3234 | struct attr *const attr = args->attr; | |
3235 | const bgp_size_t length = args->length; | |
d7c0a89a | 3236 | uint8_t tnl_type; |
355f3c11 | 3237 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 3238 | |
3239 | /* Verify that the receiver is expecting "ingress replication" as we | |
3240 | * can only support that. | |
3241 | */ | |
355f3c11 | 3242 | if (length < attr_parse_len) { |
1c50c1c0 QY |
3243 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
3244 | length); | |
7fd077aa | 3245 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
3246 | args->total); | |
3247 | } | |
3248 | stream_getc(peer->curr); /* Flags */ | |
3249 | tnl_type = stream_getc(peer->curr); | |
3250 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 3251 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 3252 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 3253 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
3254 | args->total); | |
3255 | } | |
3256 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
3257 | if (length != 9) { | |
e50f7cfd | 3258 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
3259 | "Bad PMSI tunnel attribute length %d for IR", |
3260 | length); | |
052ea98b | 3261 | return bgp_attr_malformed( |
3262 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3263 | args->total); | |
7fd077aa | 3264 | } |
3265 | } | |
3266 | ||
3267 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2a3f51cf | 3268 | bgp_attr_set_pmsi_tnl_type(attr, tnl_type); |
355f3c11 | 3269 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 3270 | |
3271 | /* Forward read pointer of input stream. */ | |
355f3c11 | 3272 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 3273 | |
3274 | return BGP_ATTR_PARSE_PROCEED; | |
3275 | } | |
3276 | ||
97a52c82 DA |
3277 | /* AIGP attribute (rfc7311) */ |
3278 | static enum bgp_attr_parse_ret bgp_attr_aigp(struct bgp_attr_parser_args *args) | |
3279 | { | |
3280 | struct peer *const peer = args->peer; | |
3281 | struct attr *const attr = args->attr; | |
3282 | const bgp_size_t length = args->length; | |
3283 | uint8_t *s = stream_pnt(peer->curr); | |
3284 | uint64_t aigp = 0; | |
3285 | ||
3286 | /* If an AIGP attribute is received on a BGP session for which | |
3287 | * AIGP_SESSION is disabled, the attribute MUST be treated exactly | |
3288 | * as if it were an unrecognized non-transitive attribute. | |
3289 | * That is, it "MUST be quietly ignored and not passed along to | |
3290 | * other BGP peers". | |
3291 | * For Internal BGP (IBGP) sessions, and for External BGP (EBGP) | |
3292 | * sessions between members of the same BGP Confederation, | |
3293 | * the default value of AIGP_SESSION SHOULD be "enabled". | |
3294 | */ | |
3295 | if (peer->sort == BGP_PEER_EBGP && | |
3296 | !CHECK_FLAG(peer->flags, PEER_FLAG_AIGP)) { | |
3297 | zlog_warn( | |
3298 | "%pBP received AIGP attribute, but eBGP peer do not support it", | |
3299 | peer); | |
3300 | goto aigp_ignore; | |
3301 | } | |
3302 | ||
a5c6a9b1 DA |
3303 | if (peer->discard_attrs[args->type]) |
3304 | goto aigp_ignore; | |
3305 | ||
97a52c82 DA |
3306 | if (!bgp_attr_aigp_valid(s, length)) |
3307 | goto aigp_ignore; | |
3308 | ||
3309 | /* Extract AIGP Metric TLV */ | |
3310 | if (bgp_attr_aigp_get_tlv_metric(s, length, &aigp)) | |
3311 | bgp_attr_set_aigp_metric(attr, aigp); | |
3312 | ||
3313 | aigp_ignore: | |
3314 | stream_forward_getp(peer->curr, length); | |
3315 | ||
a5c6a9b1 DA |
3316 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3317 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
3318 | lookup_msg(attr_str, args->type, NULL)); | |
3319 | ||
97a52c82 DA |
3320 | return BGP_ATTR_PARSE_PROCEED; |
3321 | } | |
3322 | ||
d864dd9e EB |
3323 | /* OTC attribute. */ |
3324 | static enum bgp_attr_parse_ret bgp_attr_otc(struct bgp_attr_parser_args *args) | |
3325 | { | |
3326 | struct peer *const peer = args->peer; | |
3327 | struct attr *const attr = args->attr; | |
3328 | const bgp_size_t length = args->length; | |
3329 | ||
3330 | /* Length check. */ | |
3331 | if (length != 4) { | |
3332 | flog_err(EC_BGP_ATTR_LEN, "OTC attribute length isn't 4 [%u]", | |
3333 | length); | |
3334 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3335 | args->total); | |
3336 | } | |
3337 | ||
a5c6a9b1 DA |
3338 | if (peer->discard_attrs[args->type]) |
3339 | goto otc_ignore; | |
3340 | ||
d864dd9e | 3341 | attr->otc = stream_getl(peer->curr); |
adc1c459 DA |
3342 | if (!attr->otc) { |
3343 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "OTC attribute value is 0"); | |
3344 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
3345 | args->total); | |
3346 | } | |
d864dd9e EB |
3347 | |
3348 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_OTC); | |
3349 | ||
3350 | return BGP_ATTR_PARSE_PROCEED; | |
a5c6a9b1 DA |
3351 | |
3352 | otc_ignore: | |
3353 | stream_forward_getp(peer->curr, length); | |
3354 | ||
3355 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3356 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
3357 | lookup_msg(attr_str, args->type, NULL)); | |
3358 | ||
3359 | return BGP_ATTR_PARSE_PROCEED; | |
d864dd9e EB |
3360 | } |
3361 | ||
718e3744 | 3362 | /* BGP unknown attribute treatment. */ |
79288e4c DA |
3363 | static enum bgp_attr_parse_ret |
3364 | bgp_attr_unknown(struct bgp_attr_parser_args *args) | |
d62a17ae | 3365 | { |
3366 | bgp_size_t total = args->total; | |
3367 | struct transit *transit; | |
3368 | struct peer *const peer = args->peer; | |
3369 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
3370 | uint8_t *const startp = args->startp; |
3371 | const uint8_t type = args->type; | |
3372 | const uint8_t flag = args->flags; | |
d62a17ae | 3373 | const bgp_size_t length = args->length; |
3374 | ||
3375 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3376 | zlog_debug( | |
3377 | "%s Unknown attribute is received (type %d, length %d)", | |
3378 | peer->host, type, length); | |
3379 | ||
3380 | /* Forward read pointer of input stream. */ | |
424ab01d | 3381 | stream_forward_getp(peer->curr, length); |
d62a17ae | 3382 | |
a5c6a9b1 DA |
3383 | if (peer->discard_attrs[type]) { |
3384 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3385 | zlog_debug("%pBP: Ignoring attribute %s", peer, | |
3386 | lookup_msg(attr_str, args->type, NULL)); | |
3387 | ||
3388 | return BGP_ATTR_PARSE_PROCEED; | |
3389 | } | |
3390 | ||
d62a17ae | 3391 | /* If any of the mandatory well-known attributes are not recognized, |
3392 | then the Error Subcode is set to Unrecognized Well-known | |
3393 | Attribute. The Data field contains the unrecognized attribute | |
3394 | (type, length and value). */ | |
3395 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
3396 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
3397 | args->total); | |
3398 | } | |
3399 | ||
3400 | /* Unrecognized non-transitive optional attributes must be quietly | |
3401 | ignored and not passed along to other BGP peers. */ | |
3402 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
3403 | return BGP_ATTR_PARSE_PROCEED; | |
3404 | ||
3405 | /* If a path with recognized transitive optional attribute is | |
3406 | accepted and passed along to other BGP peers and the Partial bit | |
3407 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
3408 | is not set back to 0 by the current AS. */ | |
3409 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
3410 | ||
3411 | /* Store transitive attribute to the end of attr->transit. */ | |
04fb21e2 DS |
3412 | transit = bgp_attr_get_transit(attr); |
3413 | if (!transit) | |
3414 | transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
d62a17ae | 3415 | |
0b04fa0e DS |
3416 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, |
3417 | transit->length + total); | |
d62a17ae | 3418 | |
3419 | memcpy(transit->val + transit->length, startp, total); | |
3420 | transit->length += total; | |
04fb21e2 | 3421 | bgp_attr_set_transit(attr, transit); |
d62a17ae | 3422 | |
3423 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 3424 | } |
3425 | ||
bb7bef14 | 3426 | /* Well-known attribute check. */ |
d62a17ae | 3427 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
3428 | { | |
d7c0a89a | 3429 | uint8_t type = 0; |
d62a17ae | 3430 | |
3431 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
3432 | * empty UPDATE. */ | |
3433 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
3434 | return BGP_ATTR_PARSE_PROCEED; | |
3435 | ||
3436 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
3437 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
3438 | are present, it should. Check for any other attribute being present | |
3439 | instead. | |
3440 | */ | |
404c82d5 PG |
3441 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
3442 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 3443 | return BGP_ATTR_PARSE_PROCEED; |
3444 | ||
3445 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
3446 | type = BGP_ATTR_ORIGIN; | |
3447 | ||
3448 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
3449 | type = BGP_ATTR_AS_PATH; | |
3450 | ||
3451 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
3452 | * and | |
3453 | * NLRI is empty. We can't easily check NLRI empty here though. | |
3454 | */ | |
3455 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3456 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
3457 | type = BGP_ATTR_NEXT_HOP; | |
3458 | ||
3459 | if (peer->sort == BGP_PEER_IBGP | |
3460 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
3461 | type = BGP_ATTR_LOCAL_PREF; | |
3462 | ||
4ba5a9c5 DA |
3463 | /* If any of the well-known mandatory attributes are not present |
3464 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
3465 | */ | |
d62a17ae | 3466 | if (type) { |
e50f7cfd | 3467 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 3468 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 3469 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 3470 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 3471 | } |
3472 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
3473 | } |
3474 | ||
718e3744 | 3475 | /* Read attribute of update packet. This function is called from |
8b366b9c | 3476 | bgp_update_receive() in bgp_packet.c. */ |
79288e4c DA |
3477 | enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr, |
3478 | bgp_size_t size, | |
3479 | struct bgp_nlri *mp_update, | |
3480 | struct bgp_nlri *mp_withdraw) | |
d62a17ae | 3481 | { |
79288e4c | 3482 | enum bgp_attr_parse_ret ret; |
d7c0a89a QY |
3483 | uint8_t flag = 0; |
3484 | uint8_t type = 0; | |
d62a17ae | 3485 | bgp_size_t length; |
d7c0a89a QY |
3486 | uint8_t *startp, *endp; |
3487 | uint8_t *attr_endp; | |
3488 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 3489 | /* we need the as4_path only until we have synthesized the as_path with |
3490 | * it */ | |
3491 | /* same goes for as4_aggregator */ | |
3492 | struct aspath *as4_path = NULL; | |
3493 | as_t as4_aggregator = 0; | |
3494 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
04fb21e2 | 3495 | struct transit *transit; |
d62a17ae | 3496 | |
3497 | /* Initialize bitmap. */ | |
3498 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
3499 | ||
3500 | /* End pointer of BGP attribute. */ | |
3501 | endp = BGP_INPUT_PNT(peer) + size; | |
3502 | ||
3503 | /* Get attributes to the end of attribute length. */ | |
3504 | while (BGP_INPUT_PNT(peer) < endp) { | |
3505 | /* Check remaining length check.*/ | |
3506 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
3507 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 3508 | flog_warn( |
e50f7cfd | 3509 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3510 | "%s: error BGP attribute length %lu is smaller than min len", |
3511 | peer->host, | |
3512 | (unsigned long)(endp | |
3513 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3514 | |
3515 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3516 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3517 | ret = BGP_ATTR_PARSE_ERROR; |
3518 | goto done; | |
d62a17ae | 3519 | } |
718e3744 | 3520 | |
d62a17ae | 3521 | /* Fetch attribute flag and type. */ |
3522 | startp = BGP_INPUT_PNT(peer); | |
3523 | /* "The lower-order four bits of the Attribute Flags octet are | |
3524 | unused. They MUST be zero when sent and MUST be ignored when | |
3525 | received." */ | |
3526 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
3527 | type = stream_getc(BGP_INPUT(peer)); | |
3528 | ||
3529 | /* Check whether Extended-Length applies and is in bounds */ | |
3530 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
3531 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 3532 | flog_warn( |
e50f7cfd | 3533 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3534 | "%s: Extended length set, but just %lu bytes of attr header", |
3535 | peer->host, | |
3536 | (unsigned long)(endp | |
3537 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3538 | |
3539 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3540 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3541 | ret = BGP_ATTR_PARSE_ERROR; |
3542 | goto done; | |
d62a17ae | 3543 | } |
718e3744 | 3544 | |
d62a17ae | 3545 | /* Check extended attribue length bit. */ |
3546 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
3547 | length = stream_getw(BGP_INPUT(peer)); | |
3548 | else | |
3549 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 3550 | |
d62a17ae | 3551 | /* If any attribute appears more than once in the UPDATE |
3552 | message, then the Error Subcode is set to Malformed Attribute | |
3553 | List. */ | |
718e3744 | 3554 | |
d62a17ae | 3555 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 3556 | flog_warn( |
e50f7cfd | 3557 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
3558 | "%s: error BGP attribute type %d appears twice in a message", |
3559 | peer->host, type); | |
718e3744 | 3560 | |
d62a17ae | 3561 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
3562 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3563 | ret = BGP_ATTR_PARSE_ERROR; |
3564 | goto done; | |
d62a17ae | 3565 | } |
3566 | ||
3567 | /* Set type to bitmap to check duplicate attribute. `type' is | |
3568 | unsigned char so it never overflow bitmap range. */ | |
3569 | ||
3570 | SET_BITMAP(seen, type); | |
3571 | ||
3572 | /* Overflow check. */ | |
3573 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3574 | ||
3575 | if (attr_endp > endp) { | |
ade6974d | 3576 | flog_warn( |
e50f7cfd | 3577 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3578 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3579 | peer->host, type, length, size, attr_endp, | |
3580 | endp); | |
dacffad4 QY |
3581 | /* |
3582 | * RFC 4271 6.3 | |
3583 | * If any recognized attribute has an Attribute | |
3584 | * Length that conflicts with the expected length | |
3585 | * (based on the attribute type code), then the | |
3586 | * Error Subcode MUST be set to Attribute Length | |
3587 | * Error. The Data field MUST contain the erroneous | |
3588 | * attribute (type, length, and value). | |
3589 | * ---------- | |
3590 | * We do not currently have a good way to determine the | |
3591 | * length of the attribute independent of the length | |
3592 | * received in the message. Instead we send the | |
3593 | * minimum between the amount of data we have and the | |
3594 | * amount specified by the attribute length field. | |
3595 | * | |
3596 | * Instead of directly passing in the packet buffer and | |
3597 | * offset we use the stream_get* functions to read into | |
3598 | * a stack buffer, since they perform bounds checking | |
3599 | * and we are working with untrusted data. | |
3600 | */ | |
ef56aee4 | 3601 | unsigned char ndata[peer->max_packet_size]; |
dacffad4 QY |
3602 | memset(ndata, 0x00, sizeof(ndata)); |
3603 | size_t lfl = | |
3604 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3605 | /* Rewind to end of flag field */ | |
763a5d3c | 3606 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3607 | /* Type */ |
3608 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3609 | /* Length */ | |
3610 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3611 | /* Value */ | |
3612 | size_t atl = attr_endp - startp; | |
3613 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3614 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3615 | ||
d62a17ae | 3616 | bgp_notify_send_with_data( |
3617 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3618 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3619 | ndl + lfl + 1); | |
3620 | ||
b6a171c7 QY |
3621 | ret = BGP_ATTR_PARSE_ERROR; |
3622 | goto done; | |
d62a17ae | 3623 | } |
3624 | ||
3625 | struct bgp_attr_parser_args attr_args = { | |
3626 | .peer = peer, | |
3627 | .length = length, | |
3628 | .attr = attr, | |
3629 | .type = type, | |
3630 | .flags = flag, | |
3631 | .startp = startp, | |
3632 | .total = attr_endp - startp, | |
3633 | }; | |
3634 | ||
3635 | ||
3636 | /* If any recognized attribute has Attribute Flags that conflict | |
3637 | with the Attribute Type Code, then the Error Subcode is set | |
3638 | to | |
3639 | Attribute Flags Error. The Data field contains the erroneous | |
3640 | attribute (type, length and value). */ | |
3641 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3642 | ret = bgp_attr_malformed( |
3643 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3644 | attr_args.total); | |
3645 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3646 | continue; | |
b6a171c7 | 3647 | goto done; |
d62a17ae | 3648 | } |
3649 | ||
3650 | /* OK check attribute and store it's value. */ | |
3651 | switch (type) { | |
3652 | case BGP_ATTR_ORIGIN: | |
3653 | ret = bgp_attr_origin(&attr_args); | |
3654 | break; | |
3655 | case BGP_ATTR_AS_PATH: | |
3656 | ret = bgp_attr_aspath(&attr_args); | |
3657 | break; | |
3658 | case BGP_ATTR_AS4_PATH: | |
3659 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3660 | break; | |
3661 | case BGP_ATTR_NEXT_HOP: | |
3662 | ret = bgp_attr_nexthop(&attr_args); | |
3663 | break; | |
3664 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3665 | ret = bgp_attr_med(&attr_args); | |
3666 | break; | |
3667 | case BGP_ATTR_LOCAL_PREF: | |
3668 | ret = bgp_attr_local_pref(&attr_args); | |
3669 | break; | |
3670 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3671 | ret = bgp_attr_atomic(&attr_args); | |
3672 | break; | |
3673 | case BGP_ATTR_AGGREGATOR: | |
3674 | ret = bgp_attr_aggregator(&attr_args); | |
3675 | break; | |
3676 | case BGP_ATTR_AS4_AGGREGATOR: | |
3677 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3678 | &as4_aggregator, | |
3679 | &as4_aggregator_addr); | |
3680 | break; | |
3681 | case BGP_ATTR_COMMUNITIES: | |
3682 | ret = bgp_attr_community(&attr_args); | |
3683 | break; | |
3684 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3685 | ret = bgp_attr_large_community(&attr_args); | |
3686 | break; | |
3687 | case BGP_ATTR_ORIGINATOR_ID: | |
3688 | ret = bgp_attr_originator_id(&attr_args); | |
3689 | break; | |
3690 | case BGP_ATTR_CLUSTER_LIST: | |
3691 | ret = bgp_attr_cluster_list(&attr_args); | |
3692 | break; | |
3693 | case BGP_ATTR_MP_REACH_NLRI: | |
3694 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3695 | break; | |
3696 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3697 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3698 | break; | |
3699 | case BGP_ATTR_EXT_COMMUNITIES: | |
3700 | ret = bgp_attr_ext_communities(&attr_args); | |
3701 | break; | |
1e20238a | 3702 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3703 | case BGP_ATTR_VNC: |
65efcfce | 3704 | #endif |
d62a17ae | 3705 | case BGP_ATTR_ENCAP: |
3706 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3707 | startp); | |
3708 | break; | |
3709 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3710 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3711 | break; |
7fd077aa | 3712 | case BGP_ATTR_PMSI_TUNNEL: |
3713 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3714 | break; | |
9a659715 PG |
3715 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3716 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3717 | break; | |
d864dd9e EB |
3718 | case BGP_ATTR_OTC: |
3719 | ret = bgp_attr_otc(&attr_args); | |
3720 | break; | |
97a52c82 DA |
3721 | case BGP_ATTR_AIGP: |
3722 | ret = bgp_attr_aigp(&attr_args); | |
3723 | break; | |
d62a17ae | 3724 | default: |
3725 | ret = bgp_attr_unknown(&attr_args); | |
3726 | break; | |
3727 | } | |
3728 | ||
3729 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3730 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3731 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3732 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3733 | goto done; |
d62a17ae | 3734 | } |
3735 | ||
9b9df989 | 3736 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3737 | goto done; |
9b9df989 DS |
3738 | } |
3739 | ||
d62a17ae | 3740 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3741 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3742 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3743 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3744 | goto done; |
d62a17ae | 3745 | } |
3746 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3747 | flog_warn( |
e50f7cfd | 3748 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3749 | "%s: Attribute %s, parse error - treating as withdrawal", |
3750 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3751 | goto done; |
d62a17ae | 3752 | } |
3753 | ||
3754 | /* Check the fetched length. */ | |
3755 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3756 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3757 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3758 | peer->host, lookup_msg(attr_str, type, NULL)); |
3759 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3760 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3761 | ret = BGP_ATTR_PARSE_ERROR; |
3762 | goto done; | |
d62a17ae | 3763 | } |
718e3744 | 3764 | } |
d62a17ae | 3765 | |
e5d4cda0 HS |
3766 | /* |
3767 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3768 | * About Prefix-SID path attribute, | |
3769 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3770 | * may only appear in a BGP Prefix-SID attribute attached to | |
3771 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3772 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3773 | */ | |
3774 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3775 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3776 | ||
d62a17ae | 3777 | /* Check final read pointer is same as end pointer. */ |
3778 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3779 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3780 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3781 | lookup_msg(attr_str, type, NULL)); |
3782 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3783 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3784 | |
3785 | ret = BGP_ATTR_PARSE_ERROR; | |
3786 | goto done; | |
d62a17ae | 3787 | } |
3788 | ||
88f33d66 | 3789 | /* |
3790 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3791 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3792 | * This is implemented below and will result in a NOTIFICATION. If the | |
3793 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3794 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3795 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3796 | * | |
3797 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3798 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3799 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3800 | * speaker that receives the message SHOULD ignore this attribute. | |
3801 | */ | |
3802 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3803 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3804 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3805 | ret = BGP_ATTR_PARSE_ERROR; |
3806 | goto done; | |
88f33d66 | 3807 | } |
3808 | } | |
3809 | ||
d62a17ae | 3810 | /* Check all mandatory well-known attributes are present */ |
11dbcdd3 DA |
3811 | ret = bgp_attr_check(peer, attr); |
3812 | if (ret < 0) | |
b6a171c7 | 3813 | goto done; |
d62a17ae | 3814 | |
3815 | /* | |
3816 | * At this place we can see whether we got AS4_PATH and/or | |
3817 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3818 | * We can not do this before we've read all attributes because | |
3819 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3820 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3821 | * in relationship to AGGREGATOR. | |
3822 | * So, to be defensive, we are not relying on any order and read | |
3823 | * all attributes first, including these 32bit ones, and now, | |
3824 | * afterwards, we look what and if something is to be done for as4. | |
3825 | * | |
3826 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3827 | * MP_UNREACH_NLRI. | |
3828 | */ | |
3829 | /* actually... this doesn't ever return failure currently, but | |
3830 | * better safe than sorry */ | |
3831 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3832 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3833 | &as4_aggregator_addr)) { | |
3834 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3835 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3836 | ret = BGP_ATTR_PARSE_ERROR; |
3837 | goto done; | |
d62a17ae | 3838 | } |
3839 | ||
d62a17ae | 3840 | /* |
3841 | * Finally do the checks on the aspath we did not do yet | |
3842 | * because we waited for a potentially synthesized aspath. | |
3843 | */ | |
3844 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3845 | ret = bgp_attr_aspath_check(peer, attr); | |
3846 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3847 | goto done; |
d62a17ae | 3848 | } |
718e3744 | 3849 | |
b6a171c7 | 3850 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3851 | done: |
5e0e9c09 | 3852 | |
b6a171c7 QY |
3853 | /* |
3854 | * At this stage, we have done all fiddling with as4, and the | |
3855 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3856 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3857 | * to save memory | |
3858 | */ | |
b7b3e63c DA |
3859 | /* |
3860 | * unintern - it is in the hash | |
3861 | * The flag that we got this is still there, but that | |
3862 | * does not do any trouble | |
3863 | */ | |
3864 | aspath_unintern(&as4_path); | |
b6a171c7 | 3865 | |
04fb21e2 | 3866 | transit = bgp_attr_get_transit(attr); |
b6a171c7 QY |
3867 | if (ret != BGP_ATTR_PARSE_ERROR) { |
3868 | /* Finally intern unknown attribute. */ | |
04fb21e2 DS |
3869 | if (transit) |
3870 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
b6a171c7 QY |
3871 | if (attr->encap_subtlvs) |
3872 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3873 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3874 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3875 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3876 | bgp_attr_get_vnc_subtlvs(attr); | |
3877 | ||
3878 | if (vnc_subtlvs) | |
3879 | bgp_attr_set_vnc_subtlvs( | |
3880 | attr, | |
3881 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
5e0e9c09 QY |
3882 | #endif |
3883 | } else { | |
04fb21e2 DS |
3884 | if (transit) { |
3885 | transit_free(transit); | |
3886 | bgp_attr_set_transit(attr, NULL); | |
5e0e9c09 QY |
3887 | } |
3888 | ||
3889 | bgp_attr_flush_encap(attr); | |
3890 | }; | |
3891 | ||
3892 | /* Sanity checks */ | |
04fb21e2 DS |
3893 | transit = bgp_attr_get_transit(attr); |
3894 | if (transit) | |
3895 | assert(transit->refcnt > 0); | |
d62a17ae | 3896 | if (attr->encap_subtlvs) |
5e0e9c09 | 3897 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3898 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3899 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3900 | bgp_attr_get_vnc_subtlvs(attr); | |
3901 | ||
3902 | if (vnc_subtlvs) | |
3903 | assert(vnc_subtlvs->refcnt > 0); | |
bede7744 | 3904 | #endif |
718e3744 | 3905 | |
b6a171c7 | 3906 | return ret; |
d62a17ae | 3907 | } |
3908 | ||
f4bd90c5 LK |
3909 | /* |
3910 | * Extract the tunnel type from extended community | |
3911 | */ | |
3912 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3913 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3914 | { |
3915 | struct ecommunity *ecom; | |
f6e07e1b DS |
3916 | uint32_t i; |
3917 | ||
f4bd90c5 | 3918 | if (!attr) |
fa346686 | 3919 | return; |
f4bd90c5 | 3920 | |
b53e67a3 | 3921 | ecom = bgp_attr_get_ecommunity(attr); |
f4bd90c5 | 3922 | if (!ecom || !ecom->size) |
fa346686 | 3923 | return; |
f4bd90c5 LK |
3924 | |
3925 | for (i = 0; i < ecom->size; i++) { | |
3926 | uint8_t *pnt; | |
3927 | uint8_t type, sub_type; | |
3928 | ||
3929 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3930 | type = pnt[0]; | |
3931 | sub_type = pnt[1]; | |
3932 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3933 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3934 | continue; | |
3935 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3936 | return; |
f4bd90c5 LK |
3937 | } |
3938 | ||
fa346686 | 3939 | return; |
f4bd90c5 LK |
3940 | } |
3941 | ||
d62a17ae | 3942 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3943 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3944 | struct attr *attr) | |
3945 | { | |
3946 | size_t sizep; | |
617975d1 DS |
3947 | iana_afi_t pkt_afi = IANA_AFI_IPV4; |
3948 | iana_safi_t pkt_safi = IANA_SAFI_UNICAST; | |
d62a17ae | 3949 | afi_t nh_afi; |
3950 | ||
3951 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3952 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3953 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3954 | sizep = stream_get_endp(s); | |
3955 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3956 | ||
3957 | ||
3958 | /* Convert AFI, SAFI to values for packet. */ | |
3959 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3960 | ||
3961 | stream_putw(s, pkt_afi); /* AFI */ | |
3962 | stream_putc(s, pkt_safi); /* SAFI */ | |
3963 | ||
3964 | /* Nexthop AFI */ | |
ce78a6fb | 3965 | if (afi == AFI_IP |
e496b420 HS |
3966 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3967 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3968 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3969 | else if (safi == SAFI_FLOWSPEC) |
3970 | nh_afi = afi; | |
d62a17ae | 3971 | else |
3972 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3973 | ||
3974 | /* Nexthop */ | |
3975 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3976 | switch (nh_afi) { | |
3977 | case AFI_IP: | |
3978 | switch (safi) { | |
3979 | case SAFI_UNICAST: | |
3980 | case SAFI_MULTICAST: | |
3981 | case SAFI_LABELED_UNICAST: | |
3982 | stream_putc(s, 4); | |
3983 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3984 | break; | |
3985 | case SAFI_MPLS_VPN: | |
3986 | stream_putc(s, 12); | |
3987 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3988 | stream_putl(s, 0); | |
3989 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3990 | break; | |
3991 | case SAFI_ENCAP: | |
3992 | case SAFI_EVPN: | |
3993 | stream_putc(s, 4); | |
3994 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3995 | break; | |
7c40bf39 | 3996 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3997 | if (attr->mp_nexthop_len == 0) |
3998 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3999 | else { | |
4000 | stream_putc(s, attr->mp_nexthop_len); | |
4001 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
4002 | } | |
722e8011 DS |
4003 | break; |
4004 | case SAFI_UNSPEC: | |
4005 | case SAFI_MAX: | |
4006 | assert(!"SAFI's UNSPEC or MAX being specified are a DEV ESCAPE"); | |
d62a17ae | 4007 | break; |
4008 | } | |
4009 | break; | |
4010 | case AFI_IP6: | |
4011 | switch (safi) { | |
4012 | case SAFI_UNICAST: | |
4013 | case SAFI_MULTICAST: | |
4014 | case SAFI_LABELED_UNICAST: | |
4015 | case SAFI_EVPN: { | |
4016 | if (attr->mp_nexthop_len | |
4017 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
4018 | stream_putc(s, | |
4019 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
4020 | stream_put(s, &attr->mp_nexthop_global, | |
4021 | IPV6_MAX_BYTELEN); | |
4022 | stream_put(s, &attr->mp_nexthop_local, | |
4023 | IPV6_MAX_BYTELEN); | |
4024 | } else { | |
4025 | stream_putc(s, IPV6_MAX_BYTELEN); | |
4026 | stream_put(s, &attr->mp_nexthop_global, | |
4027 | IPV6_MAX_BYTELEN); | |
4028 | } | |
4029 | } break; | |
4030 | case SAFI_MPLS_VPN: { | |
35ac9b53 PG |
4031 | if (attr->mp_nexthop_len == |
4032 | BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
d62a17ae | 4033 | stream_putc(s, 48); |
4034 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
4035 | stream_putl(s, 0); | |
4036 | stream_put(s, &attr->mp_nexthop_global, | |
4037 | IPV6_MAX_BYTELEN); | |
4038 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
4039 | stream_putl(s, 0); | |
4040 | stream_put(s, &attr->mp_nexthop_local, | |
4041 | IPV6_MAX_BYTELEN); | |
63e7ddb5 RS |
4042 | } else { |
4043 | stream_putc(s, 24); | |
4044 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
4045 | stream_putl(s, 0); | |
4046 | stream_put(s, &attr->mp_nexthop_global, | |
4047 | IPV6_MAX_BYTELEN); | |
d62a17ae | 4048 | } |
4049 | } break; | |
4050 | case SAFI_ENCAP: | |
4051 | stream_putc(s, IPV6_MAX_BYTELEN); | |
4052 | stream_put(s, &attr->mp_nexthop_global, | |
4053 | IPV6_MAX_BYTELEN); | |
4054 | break; | |
7c40bf39 | 4055 | case SAFI_FLOWSPEC: |
4056 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
722e8011 DS |
4057 | break; |
4058 | case SAFI_UNSPEC: | |
4059 | case SAFI_MAX: | |
4060 | assert(!"SAFI's UNSPEC or MAX being specified are a DEV ESCAPE"); | |
d62a17ae | 4061 | break; |
4062 | } | |
4063 | break; | |
722e8011 | 4064 | case AFI_L2VPN: |
a83da8e1 | 4065 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 4066 | flog_err( |
e50f7cfd | 4067 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
4068 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
4069 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 4070 | break; |
722e8011 DS |
4071 | case AFI_UNSPEC: |
4072 | case AFI_MAX: | |
4073 | assert(!"DEV ESCAPE: AFI_UNSPEC or AFI_MAX should not be used here"); | |
4074 | break; | |
d62a17ae | 4075 | } |
4076 | ||
4077 | /* SNPA */ | |
4078 | stream_putc(s, 0); | |
4079 | return sizep; | |
4080 | } | |
4081 | ||
4082 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
4083 | const struct prefix *p, |
4084 | const struct prefix_rd *prd, mpls_label_t *label, | |
be92fc9f | 4085 | uint32_t num_labels, bool addpath_capable, |
5f040085 | 4086 | uint32_t addpath_tx_id, struct attr *attr) |
d62a17ae | 4087 | { |
233b1a38 DS |
4088 | switch (safi) { |
4089 | case SAFI_UNSPEC: | |
4090 | case SAFI_MAX: | |
4091 | assert(!"Dev escape usage of SAFI_UNSPEC or MAX"); | |
4092 | break; | |
4093 | case SAFI_MPLS_VPN: | |
be92fc9f | 4094 | if (addpath_capable) |
d62a17ae | 4095 | stream_putl(s, addpath_tx_id); |
4096 | /* Label, RD, Prefix write. */ | |
4097 | stream_putc(s, p->prefixlen + 88); | |
4098 | stream_put(s, label, BGP_LABEL_BYTES); | |
4099 | stream_put(s, prd->val, 8); | |
4100 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
233b1a38 DS |
4101 | break; |
4102 | case SAFI_EVPN: | |
4103 | if (afi == AFI_L2VPN) | |
4104 | /* EVPN prefix - contents depend on type */ | |
4105 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, | |
4106 | attr, addpath_capable, | |
4107 | addpath_tx_id); | |
4108 | else | |
4109 | assert(!"Add encoding bits here for other AFI's"); | |
4110 | break; | |
4111 | case SAFI_LABELED_UNICAST: | |
d62a17ae | 4112 | /* Prefix write with label. */ |
be92fc9f | 4113 | stream_put_labeled_prefix(s, p, label, addpath_capable, |
ec15e1b5 | 4114 | addpath_tx_id); |
233b1a38 DS |
4115 | break; |
4116 | case SAFI_FLOWSPEC: | |
f1af8f04 PG |
4117 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
4118 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
4119 | p->u.prefix_flowspec.prefixlen); | |
233b1a38 DS |
4120 | break; |
4121 | ||
4122 | case SAFI_UNICAST: | |
4123 | case SAFI_MULTICAST: | |
be92fc9f | 4124 | stream_put_prefix_addpath(s, p, addpath_capable, addpath_tx_id); |
233b1a38 DS |
4125 | break; |
4126 | case SAFI_ENCAP: | |
4127 | assert(!"Please add proper encoding of SAFI_ENCAP"); | |
4128 | break; | |
4129 | } | |
d62a17ae | 4130 | } |
4131 | ||
5f040085 DS |
4132 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
4133 | const struct prefix *p) | |
d62a17ae | 4134 | { |
4135 | int size = PSIZE(p->prefixlen); | |
4487f0bd DS |
4136 | |
4137 | switch (safi) { | |
4138 | case SAFI_UNSPEC: | |
4139 | case SAFI_MAX: | |
4140 | assert(!"Attempting to figure size for a SAFI_UNSPEC/SAFI_MAX this is a DEV ESCAPE"); | |
4141 | break; | |
4142 | case SAFI_UNICAST: | |
4143 | case SAFI_MULTICAST: | |
4144 | break; | |
4145 | case SAFI_MPLS_VPN: | |
d62a17ae | 4146 | size += 88; |
4487f0bd DS |
4147 | break; |
4148 | case SAFI_ENCAP: | |
4149 | /* This has to be wrong, but I don't know what to put here */ | |
4150 | assert(!"Do we try to use this?"); | |
4151 | break; | |
4152 | case SAFI_LABELED_UNICAST: | |
4195afbf | 4153 | size += BGP_LABEL_BYTES; |
4487f0bd DS |
4154 | break; |
4155 | case SAFI_EVPN: | |
4156 | /* | |
4157 | * TODO: Maximum possible for type-2, type-3 and type-5 | |
4158 | */ | |
4159 | if (afi == AFI_L2VPN) | |
4160 | size += 232; | |
4161 | else | |
4162 | assert(!"Attempting to figure size for SAFI_EVPN and !AFI_L2VPN and FRR will not have the proper values"); | |
4163 | break; | |
4164 | case SAFI_FLOWSPEC: | |
0a9705a1 | 4165 | size = ((struct prefix_fs *)p)->prefix.prefixlen; |
4487f0bd DS |
4166 | break; |
4167 | } | |
4168 | ||
d62a17ae | 4169 | return size; |
8c71e481 PM |
4170 | } |
4171 | ||
f4c89855 | 4172 | /* |
65efcfce | 4173 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 4174 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 4175 | * almost the same TLV format |
f4c89855 | 4176 | */ |
d62a17ae | 4177 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
4178 | struct stream *s, struct attr *attr, | |
4179 | uint8_t attrtype) | |
4180 | { | |
4181 | unsigned int attrlenfield = 0; | |
4182 | unsigned int attrhdrlen = 0; | |
4183 | struct bgp_attr_encap_subtlv *subtlvs; | |
4184 | struct bgp_attr_encap_subtlv *st; | |
4185 | const char *attrname; | |
4186 | ||
9d303b37 DL |
4187 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
4188 | && (!attr->encap_tunneltype | |
4189 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 4190 | return; |
4191 | ||
4192 | switch (attrtype) { | |
f4c89855 | 4193 | case BGP_ATTR_ENCAP: |
d62a17ae | 4194 | attrname = "Tunnel Encap"; |
4195 | subtlvs = attr->encap_subtlvs; | |
4196 | if (subtlvs == NULL) /* nothing to do */ | |
4197 | return; | |
4198 | /* | |
4199 | * The tunnel encap attr has an "outer" tlv. | |
4200 | * T = tunneltype, | |
4201 | * L = total length of subtlvs, | |
4202 | * V = concatenated subtlvs. | |
4203 | */ | |
4204 | attrlenfield = 2 + 2; /* T + L */ | |
4205 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
4206 | break; | |
f4c89855 | 4207 | |
1e20238a | 4208 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 4209 | case BGP_ATTR_VNC: |
d62a17ae | 4210 | attrname = "VNC"; |
91ebf12c | 4211 | subtlvs = bgp_attr_get_vnc_subtlvs(attr); |
d62a17ae | 4212 | if (subtlvs == NULL) /* nothing to do */ |
4213 | return; | |
4214 | attrlenfield = 0; /* no outer T + L */ | |
4215 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
4216 | break; | |
65efcfce LB |
4217 | #endif |
4218 | ||
f4c89855 | 4219 | default: |
d62a17ae | 4220 | assert(0); |
4221 | } | |
4222 | ||
4223 | /* compute attr length */ | |
4224 | for (st = subtlvs; st; st = st->next) { | |
4225 | attrlenfield += (attrhdrlen + st->length); | |
4226 | } | |
4227 | ||
4228 | if (attrlenfield > 0xffff) { | |
4229 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
4230 | attrname, attrlenfield); | |
4231 | return; | |
4232 | } | |
4233 | ||
4234 | if (attrlenfield > 0xff) { | |
4235 | /* 2-octet length field */ | |
996c9314 LB |
4236 | stream_putc(s, |
4237 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4238 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4239 | stream_putc(s, attrtype); |
4240 | stream_putw(s, attrlenfield & 0xffff); | |
4241 | } else { | |
4242 | /* 1-octet length field */ | |
4243 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
4244 | stream_putc(s, attrtype); | |
4245 | stream_putc(s, attrlenfield & 0xff); | |
4246 | } | |
4247 | ||
4248 | if (attrtype == BGP_ATTR_ENCAP) { | |
4249 | /* write outer T+L */ | |
4250 | stream_putw(s, attr->encap_tunneltype); | |
4251 | stream_putw(s, attrlenfield - 4); | |
4252 | } | |
4253 | ||
4254 | /* write each sub-tlv */ | |
4255 | for (st = subtlvs; st; st = st->next) { | |
4256 | if (attrtype == BGP_ATTR_ENCAP) { | |
4257 | stream_putc(s, st->type); | |
4258 | stream_putc(s, st->length); | |
1e20238a | 4259 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 4260 | } else { |
4261 | stream_putw(s, st->type); | |
4262 | stream_putw(s, st->length); | |
65efcfce | 4263 | #endif |
d62a17ae | 4264 | } |
4265 | stream_put(s, st->value, st->length); | |
4266 | } | |
f4c89855 | 4267 | } |
f4c89855 | 4268 | |
d62a17ae | 4269 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 4270 | { |
d62a17ae | 4271 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
4272 | the attr length */ | |
4273 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
4274 | } |
4275 | ||
3dc339cd | 4276 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
4277 | { |
4278 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
4279 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
4280 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4281 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
4282 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4283 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
4284 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4285 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
4286 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4287 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
4288 | return true; |
4289 | return false; | |
6b5a72a3 DA |
4290 | } |
4291 | ||
718e3744 | 4292 | /* Make attribute packet. */ |
d62a17ae | 4293 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
4294 | struct stream *s, struct attr *attr, | |
4295 | struct bpacket_attr_vec_arr *vecarr, | |
4296 | struct prefix *p, afi_t afi, safi_t safi, | |
4297 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a | 4298 | mpls_label_t *label, uint32_t num_labels, |
97a52c82 DA |
4299 | bool addpath_capable, uint32_t addpath_tx_id, |
4300 | struct bgp_path_info *bpi) | |
d62a17ae | 4301 | { |
4302 | size_t cp; | |
4303 | size_t aspath_sizep; | |
4304 | struct aspath *aspath; | |
4305 | int send_as4_path = 0; | |
4306 | int send_as4_aggregator = 0; | |
8cff42ad DA |
4307 | bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
4308 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV); | |
d62a17ae | 4309 | |
4310 | if (!bgp) | |
4311 | bgp = peer->bgp; | |
4312 | ||
4313 | /* Remember current pointer. */ | |
4314 | cp = stream_get_endp(s); | |
4315 | ||
4316 | if (p | |
4317 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
4318 | && !peer_cap_enhe(peer, afi, safi))) { | |
4319 | size_t mpattrlen_pos = 0; | |
4320 | ||
4321 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
4322 | vecarr, attr); | |
996c9314 | 4323 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
be92fc9f | 4324 | num_labels, addpath_capable, |
996c9314 | 4325 | addpath_tx_id, attr); |
d62a17ae | 4326 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 4327 | } |
d62a17ae | 4328 | |
4329 | /* Origin attribute. */ | |
4330 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4331 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4332 | stream_putc(s, 1); | |
4333 | stream_putc(s, attr->origin); | |
4334 | ||
4335 | /* AS path attribute. */ | |
4336 | ||
4337 | /* If remote-peer is EBGP */ | |
4338 | if (peer->sort == BGP_PEER_EBGP | |
4339 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
4340 | PEER_FLAG_AS_PATH_UNCHANGED) | |
4341 | || attr->aspath->segments == NULL) | |
4342 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
4343 | PEER_FLAG_RSERVER_CLIENT))) { | |
4344 | aspath = aspath_dup(attr->aspath); | |
4345 | ||
4346 | /* Even though we may not be configured for confederations we | |
4347 | * may have | |
4348 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
4349 | aspath = aspath_delete_confed_seq(aspath); | |
4350 | ||
4351 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
4352 | /* Stuff our path CONFED_ID on the front */ | |
4353 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
4354 | } else { | |
4355 | if (peer->change_local_as) { | |
4356 | /* If replace-as is specified, we only use the | |
4357 | change_local_as when | |
4358 | advertising routes. */ | |
6b5a72a3 DA |
4359 | if (!CHECK_FLAG(peer->flags, |
4360 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
4361 | if (bgp_append_local_as(peer, afi, | |
4362 | safi)) | |
4363 | aspath = aspath_add_seq( | |
4364 | aspath, peer->local_as); | |
d62a17ae | 4365 | aspath = aspath_add_seq(aspath, |
4366 | peer->change_local_as); | |
4367 | } else { | |
4368 | aspath = aspath_add_seq(aspath, peer->local_as); | |
4369 | } | |
4370 | } | |
4371 | } else if (peer->sort == BGP_PEER_CONFED) { | |
4372 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
4373 | * thing */ | |
4374 | aspath = aspath_dup(attr->aspath); | |
4375 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
4376 | } else | |
4377 | aspath = attr->aspath; | |
4378 | ||
4379 | /* If peer is not AS4 capable, then: | |
4380 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
4381 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
4382 | * segment | |
4383 | * types are in it (i.e. exclude them if they are there) | |
4384 | * AND do this only if there is at least one asnum > 65535 in the | |
4385 | * path! | |
4386 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
4387 | * change | |
4388 | * all ASnums > 65535 to BGP_AS_TRANS | |
4389 | */ | |
4390 | ||
4391 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4392 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4393 | aspath_sizep = stream_get_endp(s); | |
4394 | stream_putw(s, 0); | |
4395 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
4396 | ||
4397 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
4398 | * in the path | |
4399 | */ | |
4400 | if (!use32bit && aspath_has_as4(aspath)) | |
4401 | send_as4_path = | |
4402 | 1; /* we'll do this later, at the correct place */ | |
4403 | ||
4404 | /* Nexthop attribute. */ | |
4405 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
4406 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
4407 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
4408 | ||
d62a17ae | 4409 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
4410 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4411 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4412 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4413 | attr); | |
4414 | stream_putc(s, 4); | |
4415 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
4416 | } else if (peer_cap_enhe(from, afi, safi) |
4417 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 4418 | /* |
4419 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
4420 | * received with Extended Next-hop capability in this |
4421 | * or another vrf and is now being advertised to | |
4422 | * non-ENHE peers. Since peer_cap_enhe only checks | |
4423 | * peers in this vrf, also check the nh_afi to catch | |
4424 | * the case where the originator was in another vrf. | |
d62a17ae | 4425 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
4426 | * to enable implicit next-hop self with correct A-F |
4427 | * (ipv4 address family). | |
d62a17ae | 4428 | */ |
4429 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4430 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4431 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4432 | NULL); | |
4433 | stream_putc(s, 4); | |
4434 | stream_put_ipv4(s, 0); | |
4435 | } | |
718e3744 | 4436 | } |
d62a17ae | 4437 | |
4438 | /* MED attribute. */ | |
4439 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
4440 | || bgp->maxmed_active) { | |
4441 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4442 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4443 | stream_putc(s, 4); | |
4444 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
4445 | : attr->med)); | |
4446 | } | |
4447 | ||
4448 | /* Local preference. */ | |
4449 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
4450 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4451 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4452 | stream_putc(s, 4); | |
4453 | stream_putl(s, attr->local_pref); | |
4454 | } | |
4455 | ||
4456 | /* Atomic aggregate. */ | |
4457 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4458 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4459 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4460 | stream_putc(s, 0); | |
4461 | } | |
4462 | ||
4463 | /* Aggregator. */ | |
4464 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4465 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
4466 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4467 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4468 | ||
4469 | if (use32bit) { | |
4470 | /* AS4 capable peer */ | |
4471 | stream_putc(s, 8); | |
4472 | stream_putl(s, attr->aggregator_as); | |
4473 | } else { | |
4474 | /* 2-byte AS peer */ | |
4475 | stream_putc(s, 6); | |
4476 | ||
4477 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
4478 | * used? */ | |
48e1932b | 4479 | if (attr->aggregator_as > UINT16_MAX) { |
d62a17ae | 4480 | stream_putw(s, BGP_AS_TRANS); |
4481 | ||
4482 | /* we have to send AS4_AGGREGATOR, too. | |
4483 | * we'll do that later in order to send | |
4484 | * attributes in ascending | |
4485 | * order. | |
4486 | */ | |
4487 | send_as4_aggregator = 1; | |
4488 | } else | |
d7c0a89a | 4489 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 4490 | } |
4491 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4492 | } | |
4493 | ||
4494 | /* Community attribute. */ | |
4495 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
4496 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
9a706b42 DA |
4497 | struct community *comm = NULL; |
4498 | ||
4499 | comm = bgp_attr_get_community(attr); | |
4500 | if (comm->size * 4 > 255) { | |
996c9314 LB |
4501 | stream_putc(s, |
4502 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4503 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4504 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4505 | stream_putw(s, comm->size * 4); |
d62a17ae | 4506 | } else { |
996c9314 LB |
4507 | stream_putc(s, |
4508 | BGP_ATTR_FLAG_OPTIONAL | |
4509 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4510 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4511 | stream_putc(s, comm->size * 4); |
4372df71 | 4512 | } |
9a706b42 | 4513 | stream_put(s, comm->val, comm->size * 4); |
d62a17ae | 4514 | } |
4515 | ||
4516 | /* | |
4517 | * Large Community attribute. | |
4518 | */ | |
4519 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
4520 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
4521 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
1bcf3a96 | 4522 | if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) { |
996c9314 LB |
4523 | stream_putc(s, |
4524 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4525 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4526 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4527 | stream_putw(s, |
4528 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4529 | } else { |
996c9314 LB |
4530 | stream_putc(s, |
4531 | BGP_ATTR_FLAG_OPTIONAL | |
4532 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4533 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4534 | stream_putc(s, |
4535 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
4372df71 | 4536 | } |
1bcf3a96 DA |
4537 | stream_put(s, bgp_attr_get_lcommunity(attr)->val, |
4538 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4539 | } |
4372df71 | 4540 | |
d62a17ae | 4541 | /* Route Reflector. */ |
4542 | if (peer->sort == BGP_PEER_IBGP && from | |
4543 | && from->sort == BGP_PEER_IBGP) { | |
779fee93 DS |
4544 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); |
4545 | ||
d62a17ae | 4546 | /* Originator ID. */ |
4547 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4548 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
4549 | stream_putc(s, 4); | |
4550 | ||
4551 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
4552 | stream_put_in_addr(s, &attr->originator_id); | |
4553 | else | |
4554 | stream_put_in_addr(s, &from->remote_id); | |
4555 | ||
4556 | /* Cluster list. */ | |
4557 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4558 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
4559 | ||
779fee93 DS |
4560 | if (cluster) { |
4561 | stream_putc(s, cluster->length + 4); | |
d62a17ae | 4562 | /* If this peer configuration's parent BGP has |
4563 | * cluster_id. */ | |
4564 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4565 | stream_put_in_addr(s, &bgp->cluster_id); | |
4566 | else | |
4567 | stream_put_in_addr(s, &bgp->router_id); | |
779fee93 | 4568 | stream_put(s, cluster->list, cluster->length); |
d62a17ae | 4569 | } else { |
4570 | stream_putc(s, 4); | |
4571 | /* If this peer configuration's parent BGP has | |
4572 | * cluster_id. */ | |
4573 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4574 | stream_put_in_addr(s, &bgp->cluster_id); | |
4575 | else | |
4576 | stream_put_in_addr(s, &bgp->router_id); | |
4577 | } | |
4578 | } | |
4372df71 | 4579 | |
d62a17ae | 4580 | /* Extended Communities attribute. */ |
4581 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
4582 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
b53e67a3 | 4583 | struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr); |
b17d5444 DA |
4584 | bool transparent = CHECK_FLAG(peer->af_flags[afi][safi], |
4585 | PEER_FLAG_RSERVER_CLIENT) && | |
4586 | from && | |
4587 | CHECK_FLAG(from->af_flags[afi][safi], | |
4588 | PEER_FLAG_RSERVER_CLIENT); | |
4589 | ||
4590 | if (peer->sort == BGP_PEER_IBGP || | |
4591 | peer->sort == BGP_PEER_CONFED || transparent) { | |
b53e67a3 | 4592 | if (ecomm->size * 8 > 255) { |
996c9314 LB |
4593 | stream_putc(s, |
4594 | BGP_ATTR_FLAG_OPTIONAL | |
4595 | | BGP_ATTR_FLAG_TRANS | |
4596 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4597 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4598 | stream_putw(s, ecomm->size * 8); |
d62a17ae | 4599 | } else { |
996c9314 LB |
4600 | stream_putc(s, |
4601 | BGP_ATTR_FLAG_OPTIONAL | |
4602 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4603 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4604 | stream_putc(s, ecomm->size * 8); |
d62a17ae | 4605 | } |
b53e67a3 | 4606 | stream_put(s, ecomm->val, ecomm->size * 8); |
d62a17ae | 4607 | } else { |
d7c0a89a | 4608 | uint8_t *pnt; |
d62a17ae | 4609 | int tbit; |
4610 | int ecom_tr_size = 0; | |
f6e07e1b | 4611 | uint32_t i; |
d62a17ae | 4612 | |
b53e67a3 DA |
4613 | for (i = 0; i < ecomm->size; i++) { |
4614 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4615 | tbit = *pnt; |
4616 | ||
4617 | if (CHECK_FLAG(tbit, | |
4618 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4619 | continue; | |
4620 | ||
4621 | ecom_tr_size++; | |
4622 | } | |
4623 | ||
4624 | if (ecom_tr_size) { | |
4625 | if (ecom_tr_size * 8 > 255) { | |
4626 | stream_putc( | |
4627 | s, | |
4628 | BGP_ATTR_FLAG_OPTIONAL | |
4629 | | BGP_ATTR_FLAG_TRANS | |
4630 | | BGP_ATTR_FLAG_EXTLEN); | |
4631 | stream_putc(s, | |
4632 | BGP_ATTR_EXT_COMMUNITIES); | |
4633 | stream_putw(s, ecom_tr_size * 8); | |
4634 | } else { | |
4635 | stream_putc( | |
4636 | s, | |
4637 | BGP_ATTR_FLAG_OPTIONAL | |
4638 | | BGP_ATTR_FLAG_TRANS); | |
4639 | stream_putc(s, | |
4640 | BGP_ATTR_EXT_COMMUNITIES); | |
4641 | stream_putc(s, ecom_tr_size * 8); | |
4642 | } | |
4643 | ||
b53e67a3 DA |
4644 | for (i = 0; i < ecomm->size; i++) { |
4645 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4646 | tbit = *pnt; |
4647 | ||
4648 | if (CHECK_FLAG( | |
4649 | tbit, | |
4650 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4651 | continue; | |
4652 | ||
4653 | stream_put(s, pnt, 8); | |
4654 | } | |
4655 | } | |
4656 | } | |
4657 | } | |
4372df71 | 4658 | |
d62a17ae | 4659 | /* Label index attribute. */ |
4660 | if (safi == SAFI_LABELED_UNICAST) { | |
4661 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4662 | uint32_t label_index; |
d62a17ae | 4663 | |
4664 | label_index = attr->label_index; | |
4665 | ||
4666 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4667 | stream_putc(s, |
4668 | BGP_ATTR_FLAG_OPTIONAL | |
4669 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4670 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4671 | stream_putc(s, 10); | |
4672 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4673 | stream_putw(s, | |
4674 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4675 | stream_putc(s, 0); // reserved | |
4676 | stream_putw(s, 0); // flags | |
4677 | stream_putl(s, label_index); | |
4678 | } | |
4372df71 | 4679 | } |
d62a17ae | 4680 | } |
4681 | ||
e496b420 | 4682 | /* SRv6 Service Information Attribute. */ |
dbcf19b8 | 4683 | if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) { |
e496b420 | 4684 | if (attr->srv6_l3vpn) { |
a3e3b5b0 | 4685 | uint8_t subtlv_len = |
a1a51008 RS |
4686 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH |
4687 | + BGP_ATTR_MIN_LEN | |
4688 | + BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH; | |
4689 | uint8_t tlv_len = subtlv_len + BGP_ATTR_MIN_LEN + 1; | |
4690 | uint8_t attr_len = tlv_len + BGP_ATTR_MIN_LEN; | |
e496b420 HS |
4691 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
4692 | | BGP_ATTR_FLAG_TRANS); | |
4693 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
a1a51008 | 4694 | stream_putc(s, attr_len); |
e496b420 | 4695 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); |
a1a51008 | 4696 | stream_putw(s, tlv_len); |
a3e3b5b0 RS |
4697 | stream_putc(s, 0); /* reserved */ |
4698 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO); | |
a1a51008 | 4699 | stream_putw(s, subtlv_len); |
e496b420 HS |
4700 | stream_putc(s, 0); /* reserved */ |
4701 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4702 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4703 | stream_putc(s, 0); /* sid_flags */ | |
05d99980 CS |
4704 | stream_putw(s, |
4705 | attr->srv6_l3vpn | |
4706 | ->endpoint_behavior); /* endpoint */ | |
e496b420 | 4707 | stream_putc(s, 0); /* reserved */ |
a1a51008 RS |
4708 | stream_putc( |
4709 | s, | |
4710 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE); | |
4711 | stream_putw( | |
4712 | s, | |
4713 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH); | |
4714 | stream_putc(s, attr->srv6_l3vpn->loc_block_len); | |
4715 | stream_putc(s, attr->srv6_l3vpn->loc_node_len); | |
4716 | stream_putc(s, attr->srv6_l3vpn->func_len); | |
4717 | stream_putc(s, attr->srv6_l3vpn->arg_len); | |
4718 | stream_putc(s, attr->srv6_l3vpn->transposition_len); | |
4719 | stream_putc(s, attr->srv6_l3vpn->transposition_offset); | |
e496b420 HS |
4720 | } else if (attr->srv6_vpn) { |
4721 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4722 | | BGP_ATTR_FLAG_TRANS); | |
4723 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4724 | stream_putc(s, 22); /* tlv len */ | |
4725 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4726 | stream_putw(s, 0x13); /* tlv len */ | |
4727 | stream_putc(s, 0x00); /* reserved */ | |
4728 | stream_putc(s, 0x01); /* sid_type */ | |
4729 | stream_putc(s, 0x00); /* sif_flags */ | |
4730 | stream_put(s, &attr->srv6_vpn->sid, | |
4731 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4732 | } | |
4733 | } | |
4734 | ||
d62a17ae | 4735 | if (send_as4_path) { |
4736 | /* If the peer is NOT As4 capable, AND */ | |
4737 | /* there are ASnums > 65535 in path THEN | |
4738 | * give out AS4_PATH */ | |
4739 | ||
4740 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4741 | * path segments! | |
4742 | * Hm, I wonder... confederation things *should* only be at | |
4743 | * the beginning of an aspath, right? Then we should use | |
4744 | * aspath_delete_confed_seq for this, because it is already | |
4745 | * there! (JK) | |
4746 | * Folks, talk to me: what is reasonable here!? | |
4747 | */ | |
4748 | aspath = aspath_delete_confed_seq(aspath); | |
4749 | ||
996c9314 LB |
4750 | stream_putc(s, |
4751 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4752 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4753 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4754 | aspath_sizep = stream_get_endp(s); | |
4755 | stream_putw(s, 0); | |
4756 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4757 | } | |
4758 | ||
4759 | if (aspath != attr->aspath) | |
4760 | aspath_free(aspath); | |
4761 | ||
4762 | if (send_as4_aggregator) { | |
4763 | /* send AS4_AGGREGATOR, at this place */ | |
4764 | /* this section of code moved here in order to ensure the | |
4765 | * correct | |
4766 | * *ascending* order of attributes | |
4767 | */ | |
4768 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4769 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4770 | stream_putc(s, 8); | |
4771 | stream_putl(s, attr->aggregator_as); | |
4772 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4773 | } | |
4774 | ||
4775 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4776 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4777 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4778 | /* Tunnel Encap attribute */ | |
4779 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4780 | |
1e20238a | 4781 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4782 | /* VNC attribute */ |
4783 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4784 | #endif |
d62a17ae | 4785 | } |
587ff0fd | 4786 | |
a21bd7a3 DW |
4787 | /* PMSI Tunnel */ |
4788 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4789 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4790 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4791 | stream_putc(s, 9); // Length | |
4792 | stream_putc(s, 0); // Flags | |
2a3f51cf | 4793 | stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr)); |
996c9314 LB |
4794 | stream_put(s, &(attr->label), |
4795 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4796 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4797 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4798 | } |
4799 | ||
d864dd9e EB |
4800 | /* OTC */ |
4801 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_OTC)) { | |
4802 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4803 | stream_putc(s, BGP_ATTR_OTC); | |
4804 | stream_putc(s, 4); | |
4805 | stream_putl(s, attr->otc); | |
4806 | } | |
4807 | ||
97a52c82 | 4808 | /* AIGP */ |
af9aee79 | 4809 | if (bpi && attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AIGP) && |
97a52c82 DA |
4810 | (CHECK_FLAG(peer->flags, PEER_FLAG_AIGP) || |
4811 | peer->sort != BGP_PEER_EBGP)) { | |
4812 | /* At the moment only AIGP Metric TLV exists for AIGP | |
4813 | * attribute. If more comes in, do not forget to update | |
4814 | * attr_len variable to include new ones. | |
4815 | */ | |
4816 | uint8_t attr_len = BGP_AIGP_TLV_METRIC_LEN; | |
4817 | ||
4818 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4819 | stream_putc(s, BGP_ATTR_AIGP); | |
4820 | stream_putc(s, attr_len); | |
4821 | stream_put_bgp_aigp_tlv_metric(s, bpi); | |
4822 | } | |
4823 | ||
d62a17ae | 4824 | /* Unknown transit attribute. */ |
04fb21e2 DS |
4825 | struct transit *transit = bgp_attr_get_transit(attr); |
4826 | ||
4827 | if (transit) | |
4828 | stream_put(s, transit->val, transit->length); | |
718e3744 | 4829 | |
d62a17ae | 4830 | /* Return total size of attribute. */ |
4831 | return stream_get_endp(s) - cp; | |
718e3744 | 4832 | } |
4833 | ||
d62a17ae | 4834 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4835 | { |
d62a17ae | 4836 | unsigned long attrlen_pnt; |
617975d1 DS |
4837 | iana_afi_t pkt_afi = IANA_AFI_IPV4; |
4838 | iana_safi_t pkt_safi = IANA_SAFI_UNICAST; | |
718e3744 | 4839 | |
d62a17ae | 4840 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4841 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4842 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4843 | |
d62a17ae | 4844 | attrlen_pnt = stream_get_endp(s); |
4845 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4846 | |
d62a17ae | 4847 | /* Convert AFI, SAFI to values for packet. */ |
4848 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4849 | |
d62a17ae | 4850 | stream_putw(s, pkt_afi); |
4851 | stream_putc(s, pkt_safi); | |
9cabb64b | 4852 | |
d62a17ae | 4853 | return attrlen_pnt; |
8c71e481 | 4854 | } |
718e3744 | 4855 | |
5f040085 DS |
4856 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4857 | afi_t afi, safi_t safi, | |
4858 | const struct prefix_rd *prd, | |
d7c0a89a | 4859 | mpls_label_t *label, uint32_t num_labels, |
be92fc9f | 4860 | bool addpath_capable, uint32_t addpath_tx_id, |
b57ba6d2 | 4861 | struct attr *attr) |
8c71e481 | 4862 | { |
d87c526b | 4863 | uint8_t wlabel[4] = {0x80, 0x00, 0x00}; |
cd1964ff | 4864 | |
b57ba6d2 | 4865 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4866 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4867 | num_labels = 1; |
4868 | } | |
cd1964ff | 4869 | |
d90b788e | 4870 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
be92fc9f | 4871 | addpath_capable, addpath_tx_id, attr); |
8c71e481 | 4872 | } |
718e3744 | 4873 | |
d62a17ae | 4874 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4875 | { |
d62a17ae | 4876 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4877 | } |
4878 | ||
4879 | /* Initialization of attribute. */ | |
d62a17ae | 4880 | void bgp_attr_init(void) |
718e3744 | 4881 | { |
d62a17ae | 4882 | aspath_init(); |
4883 | attrhash_init(); | |
4884 | community_init(); | |
4885 | ecommunity_init(); | |
4886 | lcommunity_init(); | |
4887 | cluster_init(); | |
4888 | transit_init(); | |
4889 | encap_init(); | |
e496b420 | 4890 | srv6_init(); |
718e3744 | 4891 | } |
4892 | ||
d62a17ae | 4893 | void bgp_attr_finish(void) |
228da428 | 4894 | { |
d62a17ae | 4895 | aspath_finish(); |
4896 | attrhash_finish(); | |
4897 | community_finish(); | |
4898 | ecommunity_finish(); | |
4899 | lcommunity_finish(); | |
4900 | cluster_finish(); | |
4901 | transit_finish(); | |
4902 | encap_finish(); | |
e496b420 | 4903 | srv6_finish(); |
228da428 CC |
4904 | } |
4905 | ||
718e3744 | 4906 | /* Make attribute packet. */ |
97a52c82 | 4907 | void bgp_dump_routes_attr(struct stream *s, struct bgp_path_info *bpi, |
bd494ec5 | 4908 | const struct prefix *prefix) |
d62a17ae | 4909 | { |
4910 | unsigned long cp; | |
4911 | unsigned long len; | |
4912 | size_t aspath_lenp; | |
4913 | struct aspath *aspath; | |
be92fc9f | 4914 | bool addpath_capable = false; |
d7c0a89a | 4915 | uint32_t addpath_tx_id = 0; |
97a52c82 | 4916 | struct attr *attr = bpi->attr; |
d62a17ae | 4917 | |
4918 | /* Remember current pointer. */ | |
4919 | cp = stream_get_endp(s); | |
4920 | ||
4921 | /* Place holder of length. */ | |
4922 | stream_putw(s, 0); | |
4923 | ||
4924 | /* Origin attribute. */ | |
4925 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4926 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4927 | stream_putc(s, 1); | |
4928 | stream_putc(s, attr->origin); | |
4929 | ||
4930 | aspath = attr->aspath; | |
4931 | ||
4932 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4933 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4934 | aspath_lenp = stream_get_endp(s); | |
4935 | stream_putw(s, 0); | |
4936 | ||
4937 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4938 | ||
4939 | /* Nexthop attribute. */ | |
4940 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4941 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4942 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4943 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4944 | stream_putc(s, 4); | |
4945 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4946 | } |
d62a17ae | 4947 | |
4948 | /* MED attribute. */ | |
4949 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4950 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4951 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4952 | stream_putc(s, 4); | |
4953 | stream_putl(s, attr->med); | |
4954 | } | |
4955 | ||
4956 | /* Local preference. */ | |
4957 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4958 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4959 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4960 | stream_putc(s, 4); | |
4961 | stream_putl(s, attr->local_pref); | |
4962 | } | |
4963 | ||
4964 | /* Atomic aggregate. */ | |
4965 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4966 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4967 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4968 | stream_putc(s, 0); | |
4969 | } | |
4970 | ||
4971 | /* Aggregator. */ | |
4972 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4973 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4974 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4975 | stream_putc(s, 8); | |
4976 | stream_putl(s, attr->aggregator_as); | |
4977 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4978 | } | |
4979 | ||
4980 | /* Community attribute. */ | |
4981 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
9a706b42 DA |
4982 | struct community *comm = NULL; |
4983 | ||
4984 | comm = bgp_attr_get_community(attr); | |
4985 | if (comm->size * 4 > 255) { | |
996c9314 LB |
4986 | stream_putc(s, |
4987 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4988 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4989 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4990 | stream_putw(s, comm->size * 4); |
d62a17ae | 4991 | } else { |
996c9314 LB |
4992 | stream_putc(s, |
4993 | BGP_ATTR_FLAG_OPTIONAL | |
4994 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4995 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4996 | stream_putc(s, comm->size * 4); |
d62a17ae | 4997 | } |
9a706b42 | 4998 | stream_put(s, comm->val, comm->size * 4); |
d62a17ae | 4999 | } |
5000 | ||
5001 | /* Large Community attribute. */ | |
5002 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
1bcf3a96 | 5003 | if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) { |
996c9314 LB |
5004 | stream_putc(s, |
5005 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
5006 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 5007 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
5008 | stream_putw(s, |
5009 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 5010 | } else { |
996c9314 LB |
5011 | stream_putc(s, |
5012 | BGP_ATTR_FLAG_OPTIONAL | |
5013 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 5014 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
5015 | stream_putc(s, |
5016 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 5017 | } |
5018 | ||
1bcf3a96 DA |
5019 | stream_put(s, bgp_attr_get_lcommunity(attr)->val, |
5020 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 5021 | } |
5022 | ||
5023 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
5024 | if (prefix != NULL && prefix->family == AF_INET6 | |
5025 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
5026 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
5027 | int sizep; | |
5028 | ||
5029 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
5030 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
5031 | sizep = stream_get_endp(s); | |
5032 | ||
5033 | /* MP header */ | |
5034 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
5035 | stream_putw(s, AFI_IP6); /* AFI */ | |
5036 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
5037 | ||
5038 | /* Next hop */ | |
5039 | stream_putc(s, attr->mp_nexthop_len); | |
5040 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
5041 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
5042 | stream_put(s, &attr->mp_nexthop_local, | |
5043 | IPV6_MAX_BYTELEN); | |
5044 | ||
5045 | /* SNPA */ | |
5046 | stream_putc(s, 0); | |
5047 | ||
5048 | /* Prefix */ | |
be92fc9f | 5049 | stream_put_prefix_addpath(s, prefix, addpath_capable, |
d62a17ae | 5050 | addpath_tx_id); |
5051 | ||
5052 | /* Set MP attribute length. */ | |
5053 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
5054 | } | |
5055 | ||
5056 | /* Prefix SID */ | |
5057 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
5058 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
5059 | stream_putc(s, |
5060 | BGP_ATTR_FLAG_OPTIONAL | |
5061 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 5062 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
5063 | stream_putc(s, 10); | |
5064 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
5065 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
5066 | stream_putc(s, 0); // reserved | |
5067 | stream_putw(s, 0); // flags | |
5068 | stream_putl(s, attr->label_index); | |
5069 | } | |
5070 | } | |
5071 | ||
d864dd9e EB |
5072 | /* OTC */ |
5073 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_OTC)) { | |
5074 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
5075 | stream_putc(s, BGP_ATTR_OTC); | |
5076 | stream_putc(s, 4); | |
5077 | stream_putl(s, attr->otc); | |
5078 | } | |
5079 | ||
97a52c82 DA |
5080 | /* AIGP */ |
5081 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AIGP)) { | |
5082 | /* At the moment only AIGP Metric TLV exists for AIGP | |
5083 | * attribute. If more comes in, do not forget to update | |
5084 | * attr_len variable to include new ones. | |
5085 | */ | |
5086 | uint8_t attr_len = BGP_AIGP_TLV_METRIC_LEN; | |
5087 | ||
5088 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
5089 | stream_putc(s, BGP_ATTR_AIGP); | |
5090 | stream_putc(s, attr_len); | |
5091 | stream_put_bgp_aigp_tlv_metric(s, bpi); | |
5092 | } | |
5093 | ||
d62a17ae | 5094 | /* Return total size of attribute. */ |
5095 | len = stream_get_endp(s) - cp - 2; | |
5096 | stream_putw_at(s, cp, len); | |
718e3744 | 5097 | } |
a5c6a9b1 DA |
5098 | |
5099 | void bgp_path_attribute_discard_vty(struct vty *vty, struct peer *peer, | |
5100 | const char *discard_attrs) | |
5101 | { | |
5102 | int i, num_attributes; | |
5103 | char **attributes; | |
5104 | afi_t afi; | |
5105 | safi_t safi; | |
5106 | ||
5107 | if (discard_attrs) { | |
5108 | frrstr_split(discard_attrs, " ", &attributes, &num_attributes); | |
5109 | ||
5110 | for (i = 0; i < BGP_ATTR_MAX; i++) | |
5111 | peer->discard_attrs[i] = false; | |
5112 | ||
5113 | for (i = 0; i < num_attributes; i++) { | |
5114 | uint8_t attr_num = strtoul(attributes[i], NULL, 10); | |
5115 | ||
5116 | XFREE(MTYPE_TMP, attributes[i]); | |
5117 | ||
5118 | /* Some of the attributes, just can't be ignored. */ | |
5119 | if (attr_num == BGP_ATTR_ORIGIN || | |
5120 | attr_num == BGP_ATTR_AS_PATH || | |
5121 | attr_num == BGP_ATTR_NEXT_HOP || | |
5122 | attr_num == BGP_ATTR_MULTI_EXIT_DISC || | |
5123 | attr_num == BGP_ATTR_MP_REACH_NLRI || | |
5124 | attr_num == BGP_ATTR_MP_UNREACH_NLRI || | |
5125 | attr_num == BGP_ATTR_EXT_COMMUNITIES) { | |
5126 | vty_out(vty, | |
5127 | "%% Can't discard path-attribute %s, ignoring.\n", | |
5128 | lookup_msg(attr_str, attr_num, NULL)); | |
5129 | continue; | |
5130 | } | |
5131 | ||
5132 | /* Ignore local-pref, originator-id, cluster-list only | |
5133 | * for eBGP. | |
5134 | */ | |
5135 | if (peer->sort != BGP_PEER_EBGP && | |
5136 | (attr_num == BGP_ATTR_LOCAL_PREF || | |
5137 | attr_num == BGP_ATTR_ORIGINATOR_ID || | |
5138 | attr_num == BGP_ATTR_CLUSTER_LIST)) { | |
5139 | vty_out(vty, | |
5140 | "%% Can discard path-attribute %s only for eBGP, ignoring.\n", | |
5141 | lookup_msg(attr_str, attr_num, NULL)); | |
5142 | continue; | |
5143 | } | |
5144 | ||
5145 | peer->discard_attrs[attr_num] = true; | |
5146 | } | |
5147 | XFREE(MTYPE_TMP, attributes); | |
5148 | ||
5149 | /* Configuring path attributes to be discarded will trigger | |
5150 | * an inbound Route Refresh to ensure that the routing table | |
5151 | * is up to date. | |
5152 | */ | |
5153 | FOREACH_AFI_SAFI (afi, safi) | |
5154 | peer_clear_soft(peer, afi, safi, BGP_CLEAR_SOFT_IN); | |
5155 | } | |
5156 | } |