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718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
e496b420 | 35 | #include "srv6.h" |
718e3744 | 36 | |
37 | #include "bgpd/bgpd.h" | |
38 | #include "bgpd/bgp_attr.h" | |
39 | #include "bgpd/bgp_route.h" | |
40 | #include "bgpd/bgp_aspath.h" | |
41 | #include "bgpd/bgp_community.h" | |
42 | #include "bgpd/bgp_debug.h" | |
14454c9f | 43 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 44 | #include "bgpd/bgp_label.h" |
718e3744 | 45 | #include "bgpd/bgp_packet.h" |
46 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 47 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 48 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 49 | #include "bgpd/bgp_encap_types.h" |
1e20238a | 50 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 51 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
52 | #include "bgp_encap_types.h" | |
53 | #include "bgp_vnc_types.h" | |
65efcfce | 54 | #endif |
b18825eb | 55 | #include "bgp_evpn.h" |
7c40bf39 | 56 | #include "bgp_flowspec_private.h" |
eee353c5 | 57 | #include "bgp_mac.h" |
6b0655a2 | 58 | |
718e3744 | 59 | /* Attribute strings for logging. */ |
d62a17ae | 60 | static const struct message attr_str[] = { |
61 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
62 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
63 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
64 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
65 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
66 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
67 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
68 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
69 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
70 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
d62a17ae | 71 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, |
72 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
73 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
74 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
75 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
76 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 77 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 78 | {BGP_ATTR_ENCAP, "ENCAP"}, |
1e20238a | 79 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 80 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 81 | #endif |
d62a17ae | 82 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
83 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
9a659715 | 84 | {BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"}, |
d62a17ae | 85 | {0}}; |
afcb7679 | 86 | |
996c9314 LB |
87 | static const struct message attr_flag_str[] = { |
88 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
89 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
90 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
91 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
92 | this list */ | |
93 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
94 | {0}}; | |
6b0655a2 | 95 | |
9bddac4b | 96 | static struct hash *cluster_hash; |
718e3744 | 97 | |
2703b7db DA |
98 | struct attr_extra *bgp_attr_extra_alloc(void) |
99 | { | |
100 | return XCALLOC(MTYPE_ATTR_EXTRA, sizeof(struct attr_extra)); | |
101 | } | |
102 | ||
103 | void bgp_attr_extra_free(struct attr *attr) | |
104 | { | |
105 | XFREE(MTYPE_ATTR_EXTRA, attr->extra); | |
106 | } | |
107 | ||
d62a17ae | 108 | static void *cluster_hash_alloc(void *p) |
718e3744 | 109 | { |
d62a17ae | 110 | const struct cluster_list *val = (const struct cluster_list *)p; |
111 | struct cluster_list *cluster; | |
718e3744 | 112 | |
d62a17ae | 113 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
114 | cluster->length = val->length; | |
718e3744 | 115 | |
d62a17ae | 116 | if (cluster->length) { |
117 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
118 | memcpy(cluster->list, val->list, val->length); | |
119 | } else | |
120 | cluster->list = NULL; | |
718e3744 | 121 | |
d62a17ae | 122 | cluster->refcnt = 0; |
718e3744 | 123 | |
d62a17ae | 124 | return cluster; |
718e3744 | 125 | } |
126 | ||
127 | /* Cluster list related functions. */ | |
d62a17ae | 128 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 129 | { |
628565c7 | 130 | struct cluster_list tmp = {}; |
d62a17ae | 131 | struct cluster_list *cluster; |
718e3744 | 132 | |
d62a17ae | 133 | tmp.length = length; |
628565c7 | 134 | tmp.list = length == 0 ? NULL : pnt; |
718e3744 | 135 | |
d62a17ae | 136 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
137 | cluster->refcnt++; | |
138 | return cluster; | |
718e3744 | 139 | } |
140 | ||
3dc339cd | 141 | bool cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 142 | { |
d62a17ae | 143 | int i; |
144 | ||
145 | for (i = 0; i < cluster->length / 4; i++) | |
146 | if (cluster->list[i].s_addr == originator.s_addr) | |
3dc339cd DA |
147 | return true; |
148 | return false; | |
718e3744 | 149 | } |
150 | ||
d8b87afe | 151 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 152 | { |
d62a17ae | 153 | const struct cluster_list *cluster = p; |
718e3744 | 154 | |
d62a17ae | 155 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 156 | } |
157 | ||
74df8d6d | 158 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 159 | { |
d62a17ae | 160 | const struct cluster_list *cluster1 = p1; |
161 | const struct cluster_list *cluster2 = p2; | |
923de654 | 162 | |
f22ed884 QY |
163 | if (cluster1->list == cluster2->list) |
164 | return true; | |
165 | ||
166 | if (!cluster1->list || !cluster2->list) | |
167 | return false; | |
168 | ||
169 | if (cluster1->length != cluster2->length) | |
170 | return false; | |
171 | ||
172 | return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 173 | } |
174 | ||
d62a17ae | 175 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 176 | { |
0a22ddfb | 177 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 178 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 179 | } |
180 | ||
d62a17ae | 181 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 182 | { |
d62a17ae | 183 | struct cluster_list *find; |
718e3744 | 184 | |
d62a17ae | 185 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
186 | find->refcnt++; | |
718e3744 | 187 | |
d62a17ae | 188 | return find; |
718e3744 | 189 | } |
190 | ||
628565c7 | 191 | static void cluster_unintern(struct cluster_list **cluster) |
718e3744 | 192 | { |
628565c7 QY |
193 | if ((*cluster)->refcnt) |
194 | (*cluster)->refcnt--; | |
195 | ||
196 | if ((*cluster)->refcnt == 0) { | |
197 | void *p = hash_release(cluster_hash, *cluster); | |
198 | assert(p == *cluster); | |
199 | cluster_free(*cluster); | |
200 | *cluster = NULL; | |
d62a17ae | 201 | } |
718e3744 | 202 | } |
203 | ||
d62a17ae | 204 | static void cluster_init(void) |
718e3744 | 205 | { |
996c9314 | 206 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 207 | "BGP Cluster"); |
718e3744 | 208 | } |
228da428 | 209 | |
d62a17ae | 210 | static void cluster_finish(void) |
228da428 | 211 | { |
d62a17ae | 212 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
213 | hash_free(cluster_hash); | |
214 | cluster_hash = NULL; | |
228da428 | 215 | } |
6b0655a2 | 216 | |
bede7744 | 217 | static struct hash *encap_hash = NULL; |
1e20238a | 218 | #ifdef ENABLE_BGP_VNC |
bede7744 LB |
219 | static struct hash *vnc_hash = NULL; |
220 | #endif | |
e496b420 HS |
221 | static struct hash *srv6_l3vpn_hash; |
222 | static struct hash *srv6_vpn_hash; | |
bede7744 | 223 | |
d62a17ae | 224 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 225 | { |
d62a17ae | 226 | struct bgp_attr_encap_subtlv *new; |
227 | struct bgp_attr_encap_subtlv *tail; | |
228 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 229 | |
d62a17ae | 230 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 231 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 232 | if (tail) { |
233 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
234 | tail = tail->next; | |
235 | } else { | |
236 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
237 | } | |
238 | assert(tail); | |
239 | memcpy(tail, p, size); | |
240 | tail->next = NULL; | |
f4c89855 | 241 | } |
f4c89855 | 242 | |
d62a17ae | 243 | return new; |
f4c89855 LB |
244 | } |
245 | ||
d62a17ae | 246 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 247 | { |
d62a17ae | 248 | struct bgp_attr_encap_subtlv *next; |
249 | while (p) { | |
250 | next = p->next; | |
251 | p->next = NULL; | |
252 | XFREE(MTYPE_ENCAP_TLV, p); | |
253 | p = next; | |
254 | } | |
f4c89855 LB |
255 | } |
256 | ||
d62a17ae | 257 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 258 | { |
d62a17ae | 259 | if (!attr) |
260 | return; | |
f4c89855 | 261 | |
d62a17ae | 262 | if (attr->encap_subtlvs) { |
263 | encap_free(attr->encap_subtlvs); | |
264 | attr->encap_subtlvs = NULL; | |
265 | } | |
1e20238a | 266 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
267 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
268 | bgp_attr_get_vnc_subtlvs(attr); | |
269 | ||
270 | if (vnc_subtlvs) { | |
271 | encap_free(vnc_subtlvs); | |
272 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 273 | } |
65efcfce | 274 | #endif |
f4c89855 LB |
275 | } |
276 | ||
277 | /* | |
278 | * Compare encap sub-tlv chains | |
279 | * | |
280 | * 1 = equivalent | |
281 | * 0 = not equivalent | |
282 | * | |
283 | * This algorithm could be made faster if needed | |
284 | */ | |
3dc339cd DA |
285 | static bool encap_same(const struct bgp_attr_encap_subtlv *h1, |
286 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 287 | { |
36de6e0e A |
288 | const struct bgp_attr_encap_subtlv *p; |
289 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 290 | |
d62a17ae | 291 | if (h1 == h2) |
3dc339cd | 292 | return true; |
d62a17ae | 293 | if (h1 == NULL || h2 == NULL) |
3dc339cd | 294 | return false; |
f4c89855 | 295 | |
d62a17ae | 296 | for (p = h1; p; p = p->next) { |
297 | for (q = h2; q; q = q->next) { | |
298 | if ((p->type == q->type) && (p->length == q->length) | |
299 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 300 | |
d62a17ae | 301 | break; |
302 | } | |
303 | } | |
304 | if (!q) | |
3dc339cd | 305 | return false; |
f4c89855 | 306 | } |
f4c89855 | 307 | |
d62a17ae | 308 | for (p = h2; p; p = p->next) { |
309 | for (q = h1; q; q = q->next) { | |
310 | if ((p->type == q->type) && (p->length == q->length) | |
311 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 312 | |
d62a17ae | 313 | break; |
314 | } | |
315 | } | |
316 | if (!q) | |
3dc339cd | 317 | return false; |
f4c89855 | 318 | } |
f4c89855 | 319 | |
3dc339cd | 320 | return true; |
f4c89855 LB |
321 | } |
322 | ||
d62a17ae | 323 | static void *encap_hash_alloc(void *p) |
bede7744 | 324 | { |
d62a17ae | 325 | /* Encap structure is already allocated. */ |
326 | return p; | |
bede7744 LB |
327 | } |
328 | ||
d62a17ae | 329 | typedef enum { |
330 | ENCAP_SUBTLV_TYPE, | |
1e20238a | 331 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 332 | VNC_SUBTLV_TYPE |
bede7744 LB |
333 | #endif |
334 | } encap_subtlv_type; | |
335 | ||
336 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 337 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 338 | { |
d62a17ae | 339 | struct bgp_attr_encap_subtlv *find; |
340 | struct hash *hash = encap_hash; | |
1e20238a | 341 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 342 | if (type == VNC_SUBTLV_TYPE) |
343 | hash = vnc_hash; | |
bede7744 LB |
344 | #endif |
345 | ||
d62a17ae | 346 | find = hash_get(hash, encap, encap_hash_alloc); |
347 | if (find != encap) | |
348 | encap_free(encap); | |
349 | find->refcnt++; | |
bede7744 | 350 | |
d62a17ae | 351 | return find; |
bede7744 LB |
352 | } |
353 | ||
d62a17ae | 354 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
355 | encap_subtlv_type type) | |
bede7744 | 356 | { |
d62a17ae | 357 | struct bgp_attr_encap_subtlv *encap = *encapp; |
358 | if (encap->refcnt) | |
359 | encap->refcnt--; | |
bede7744 | 360 | |
d62a17ae | 361 | if (encap->refcnt == 0) { |
362 | struct hash *hash = encap_hash; | |
1e20238a | 363 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 364 | if (type == VNC_SUBTLV_TYPE) |
365 | hash = vnc_hash; | |
bede7744 | 366 | #endif |
d62a17ae | 367 | hash_release(hash, encap); |
368 | encap_free(encap); | |
369 | *encapp = NULL; | |
370 | } | |
bede7744 LB |
371 | } |
372 | ||
d8b87afe | 373 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 374 | { |
d62a17ae | 375 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 376 | |
d62a17ae | 377 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
378 | } |
379 | ||
74df8d6d | 380 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 381 | { |
36de6e0e A |
382 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
383 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
384 | } |
385 | ||
d62a17ae | 386 | static void encap_init(void) |
bede7744 | 387 | { |
996c9314 | 388 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 389 | "BGP Encap Hash"); |
1e20238a | 390 | #ifdef ENABLE_BGP_VNC |
996c9314 | 391 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 392 | "BGP VNC Hash"); |
bede7744 LB |
393 | #endif |
394 | } | |
395 | ||
d62a17ae | 396 | static void encap_finish(void) |
bede7744 | 397 | { |
d62a17ae | 398 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
399 | hash_free(encap_hash); | |
400 | encap_hash = NULL; | |
1e20238a | 401 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 402 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
403 | hash_free(vnc_hash); | |
404 | vnc_hash = NULL; | |
bede7744 LB |
405 | #endif |
406 | } | |
407 | ||
d62a17ae | 408 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 409 | { |
d62a17ae | 410 | if (!a1 && a2) |
411 | return false; | |
412 | if (!a2 && a1) | |
413 | return false; | |
414 | if (!a1 && !a2) | |
415 | return true; | |
6c924775 | 416 | |
761cc919 IS |
417 | return bgp_route_evpn_same(bgp_attr_get_evpn_overlay(a1), |
418 | bgp_attr_get_evpn_overlay(a2)); | |
684a7227 PG |
419 | } |
420 | ||
718e3744 | 421 | /* Unknown transit attribute. */ |
9bddac4b | 422 | static struct hash *transit_hash; |
718e3744 | 423 | |
d62a17ae | 424 | static void transit_free(struct transit *transit) |
718e3744 | 425 | { |
0a22ddfb | 426 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 427 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 428 | } |
429 | ||
d62a17ae | 430 | static void *transit_hash_alloc(void *p) |
718e3744 | 431 | { |
d62a17ae | 432 | /* Transit structure is already allocated. */ |
433 | return p; | |
718e3744 | 434 | } |
435 | ||
d62a17ae | 436 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 437 | { |
d62a17ae | 438 | struct transit *find; |
718e3744 | 439 | |
d62a17ae | 440 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
441 | if (find != transit) | |
442 | transit_free(transit); | |
443 | find->refcnt++; | |
718e3744 | 444 | |
d62a17ae | 445 | return find; |
718e3744 | 446 | } |
447 | ||
547357c4 | 448 | static void transit_unintern(struct transit **transit) |
718e3744 | 449 | { |
547357c4 QY |
450 | if ((*transit)->refcnt) |
451 | (*transit)->refcnt--; | |
718e3744 | 452 | |
547357c4 QY |
453 | if ((*transit)->refcnt == 0) { |
454 | hash_release(transit_hash, *transit); | |
455 | transit_free(*transit); | |
456 | *transit = NULL; | |
d62a17ae | 457 | } |
718e3744 | 458 | } |
459 | ||
e496b420 HS |
460 | static void *srv6_l3vpn_hash_alloc(void *p) |
461 | { | |
462 | return p; | |
463 | } | |
464 | ||
465 | static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn) | |
466 | { | |
467 | XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn); | |
468 | } | |
469 | ||
470 | static struct bgp_attr_srv6_l3vpn * | |
471 | srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn) | |
472 | { | |
473 | struct bgp_attr_srv6_l3vpn *find; | |
474 | ||
475 | find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc); | |
476 | if (find != l3vpn) | |
477 | srv6_l3vpn_free(l3vpn); | |
478 | find->refcnt++; | |
479 | return find; | |
480 | } | |
481 | ||
482 | static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp) | |
483 | { | |
484 | struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp; | |
485 | ||
486 | if (l3vpn->refcnt) | |
487 | l3vpn->refcnt--; | |
488 | ||
489 | if (l3vpn->refcnt == 0) { | |
490 | hash_release(srv6_l3vpn_hash, l3vpn); | |
491 | srv6_l3vpn_free(l3vpn); | |
492 | *l3vpnp = NULL; | |
493 | } | |
494 | } | |
495 | ||
496 | static void *srv6_vpn_hash_alloc(void *p) | |
497 | { | |
498 | return p; | |
499 | } | |
500 | ||
501 | static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn) | |
502 | { | |
503 | XFREE(MTYPE_BGP_SRV6_VPN, vpn); | |
504 | } | |
505 | ||
506 | static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn) | |
507 | { | |
508 | struct bgp_attr_srv6_vpn *find; | |
509 | ||
510 | find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc); | |
511 | if (find != vpn) | |
512 | srv6_vpn_free(vpn); | |
513 | find->refcnt++; | |
514 | return find; | |
515 | } | |
516 | ||
517 | static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp) | |
518 | { | |
519 | struct bgp_attr_srv6_vpn *vpn = *vpnp; | |
520 | ||
521 | if (vpn->refcnt) | |
522 | vpn->refcnt--; | |
523 | ||
524 | if (vpn->refcnt == 0) { | |
525 | hash_release(srv6_vpn_hash, vpn); | |
526 | srv6_vpn_free(vpn); | |
527 | *vpnp = NULL; | |
528 | } | |
529 | } | |
530 | ||
531 | static uint32_t srv6_l3vpn_hash_key_make(const void *p) | |
532 | { | |
533 | const struct bgp_attr_srv6_l3vpn *l3vpn = p; | |
534 | uint32_t key = 0; | |
535 | ||
536 | key = jhash(&l3vpn->sid, 16, key); | |
537 | key = jhash_1word(l3vpn->sid_flags, key); | |
538 | key = jhash_1word(l3vpn->endpoint_behavior, key); | |
9299fd00 RS |
539 | key = jhash_1word(l3vpn->loc_block_len, key); |
540 | key = jhash_1word(l3vpn->loc_node_len, key); | |
541 | key = jhash_1word(l3vpn->func_len, key); | |
542 | key = jhash_1word(l3vpn->arg_len, key); | |
543 | key = jhash_1word(l3vpn->transposition_len, key); | |
544 | key = jhash_1word(l3vpn->transposition_offset, key); | |
e496b420 HS |
545 | return key; |
546 | } | |
547 | ||
548 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
549 | { | |
550 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
551 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
552 | ||
553 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
554 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
9299fd00 RS |
555 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior |
556 | && l3vpn1->loc_block_len == l3vpn2->loc_block_len | |
557 | && l3vpn1->loc_node_len == l3vpn2->loc_node_len | |
558 | && l3vpn1->func_len == l3vpn2->func_len | |
559 | && l3vpn1->arg_len == l3vpn2->arg_len | |
560 | && l3vpn1->transposition_len == l3vpn2->transposition_len | |
561 | && l3vpn1->transposition_offset == l3vpn2->transposition_offset; | |
e496b420 HS |
562 | } |
563 | ||
564 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
565 | const struct bgp_attr_srv6_l3vpn *h2) | |
566 | { | |
567 | if (h1 == h2) | |
568 | return true; | |
569 | else if (h1 == NULL || h2 == NULL) | |
570 | return false; | |
571 | else | |
572 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
573 | } | |
574 | ||
575 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
576 | { | |
577 | const struct bgp_attr_srv6_vpn *vpn = p; | |
578 | uint32_t key = 0; | |
579 | ||
580 | key = jhash(&vpn->sid, 16, key); | |
581 | key = jhash_1word(vpn->sid_flags, key); | |
582 | return key; | |
583 | } | |
584 | ||
585 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
586 | { | |
587 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
588 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
589 | ||
590 | return sid_same(&vpn1->sid, &vpn2->sid) | |
591 | && vpn1->sid_flags == vpn2->sid_flags; | |
592 | } | |
593 | ||
594 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
595 | const struct bgp_attr_srv6_vpn *h2) | |
596 | { | |
597 | if (h1 == h2) | |
598 | return true; | |
599 | else if (h1 == NULL || h2 == NULL) | |
600 | return false; | |
601 | else | |
602 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
603 | } | |
604 | ||
605 | static void srv6_init(void) | |
606 | { | |
607 | srv6_l3vpn_hash = | |
608 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
609 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
610 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
611 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
612 | } | |
613 | ||
614 | static void srv6_finish(void) | |
615 | { | |
616 | hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free); | |
617 | hash_free(srv6_l3vpn_hash); | |
618 | srv6_l3vpn_hash = NULL; | |
619 | hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
620 | hash_free(srv6_vpn_hash); | |
621 | srv6_vpn_hash = NULL; | |
622 | } | |
623 | ||
d8b87afe | 624 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 625 | { |
d62a17ae | 626 | const struct transit *transit = p; |
718e3744 | 627 | |
d62a17ae | 628 | return jhash(transit->val, transit->length, 0); |
718e3744 | 629 | } |
630 | ||
74df8d6d | 631 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 632 | { |
d62a17ae | 633 | const struct transit *transit1 = p1; |
634 | const struct transit *transit2 = p2; | |
923de654 | 635 | |
d62a17ae | 636 | return (transit1->length == transit2->length |
637 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 638 | } |
639 | ||
d62a17ae | 640 | static void transit_init(void) |
718e3744 | 641 | { |
996c9314 | 642 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 643 | "BGP Transit Hash"); |
718e3744 | 644 | } |
228da428 | 645 | |
d62a17ae | 646 | static void transit_finish(void) |
228da428 | 647 | { |
d62a17ae | 648 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
649 | hash_free(transit_hash); | |
650 | transit_hash = NULL; | |
228da428 | 651 | } |
6b0655a2 | 652 | |
718e3744 | 653 | /* Attribute hash routines. */ |
9bddac4b | 654 | static struct hash *attrhash; |
718e3744 | 655 | |
d62a17ae | 656 | unsigned long int attr_count(void) |
cbdfbaa5 | 657 | { |
d62a17ae | 658 | return attrhash->count; |
cbdfbaa5 PJ |
659 | } |
660 | ||
d62a17ae | 661 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 662 | { |
d62a17ae | 663 | return transit_hash->count; |
cbdfbaa5 PJ |
664 | } |
665 | ||
d8b87afe | 666 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 667 | { |
d62a17ae | 668 | const struct attr *attr = (struct attr *)p; |
669 | uint32_t key = 0; | |
c8e7b895 | 670 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 671 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 672 | |
0d0268a6 | 673 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
674 | MIX3(attr->local_pref, attr->aggregator_as, |
675 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
676 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
677 | attr->originator_id.s_addr); | |
678 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 679 | |
680 | if (attr->aspath) | |
681 | MIX(aspath_key_make(attr->aspath)); | |
682 | if (attr->community) | |
683 | MIX(community_hash_make(attr->community)); | |
684 | ||
685 | if (attr->lcommunity) | |
686 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
b53e67a3 DA |
687 | if (bgp_attr_get_ecommunity(attr)) |
688 | MIX(ecommunity_hash_make(bgp_attr_get_ecommunity(attr))); | |
d04ac434 DS |
689 | if (bgp_attr_get_ipv6_ecommunity(attr)) |
690 | MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr))); | |
779fee93 DS |
691 | if (bgp_attr_get_cluster(attr)) |
692 | MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr))); | |
04fb21e2 DS |
693 | if (bgp_attr_get_transit(attr)) |
694 | MIX(transit_hash_key_make(bgp_attr_get_transit(attr))); | |
d62a17ae | 695 | if (attr->encap_subtlvs) |
696 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
b83127e1 HS |
697 | if (attr->srv6_l3vpn) |
698 | MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn)); | |
699 | if (attr->srv6_vpn) | |
700 | MIX(srv6_vpn_hash_key_make(attr->srv6_vpn)); | |
1e20238a | 701 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
702 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
703 | bgp_attr_get_vnc_subtlvs(attr); | |
704 | if (vnc_subtlvs) | |
705 | MIX(encap_hash_key_make(vnc_subtlvs)); | |
bede7744 | 706 | #endif |
d62a17ae | 707 | MIX(attr->mp_nexthop_len); |
708 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
709 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 710 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 711 | MIX(attr->rmap_table_id); |
0789eb69 KM |
712 | MIX(attr->nh_type); |
713 | MIX(attr->bh_type); | |
d62a17ae | 714 | |
715 | return key; | |
716 | } | |
717 | ||
74df8d6d | 718 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 719 | { |
720 | const struct attr *attr1 = p1; | |
721 | const struct attr *attr2 = p2; | |
722 | ||
723 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
724 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
725 | && attr1->aspath == attr2->aspath | |
726 | && attr1->community == attr2->community && attr1->med == attr2->med | |
727 | && attr1->local_pref == attr2->local_pref | |
728 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
729 | if (attr1->aggregator_as == attr2->aggregator_as | |
730 | && attr1->aggregator_addr.s_addr | |
731 | == attr2->aggregator_addr.s_addr | |
732 | && attr1->weight == attr2->weight | |
733 | && attr1->tag == attr2->tag | |
734 | && attr1->label_index == attr2->label_index | |
735 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
b53e67a3 DA |
736 | && bgp_attr_get_ecommunity(attr1) |
737 | == bgp_attr_get_ecommunity(attr2) | |
d04ac434 DS |
738 | && bgp_attr_get_ipv6_ecommunity(attr1) |
739 | == bgp_attr_get_ipv6_ecommunity(attr2) | |
d62a17ae | 740 | && attr1->lcommunity == attr2->lcommunity |
779fee93 DS |
741 | && bgp_attr_get_cluster(attr1) |
742 | == bgp_attr_get_cluster(attr2) | |
04fb21e2 DS |
743 | && bgp_attr_get_transit(attr1) |
744 | == bgp_attr_get_transit(attr2) | |
951745bd | 745 | && attr1->rmap_table_id == attr2->rmap_table_id |
d62a17ae | 746 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) |
747 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 748 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
749 | && encap_same(bgp_attr_get_vnc_subtlvs(attr1), |
750 | bgp_attr_get_vnc_subtlvs(attr2)) | |
65efcfce | 751 | #endif |
0d0268a6 LB |
752 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
753 | &attr2->mp_nexthop_global) | |
754 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
755 | &attr2->mp_nexthop_local) | |
756 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
757 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 758 | && IPV4_ADDR_SAME(&attr1->originator_id, |
759 | &attr2->originator_id) | |
77e62f2b | 760 | && overlay_index_same(attr1, attr2) |
0a50c248 | 761 | && !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) |
7904e9fd AK |
762 | && attr1->es_flags == attr2->es_flags |
763 | && attr1->mm_sync_seqnum == attr2->mm_sync_seqnum | |
74e2bd89 AK |
764 | && attr1->df_pref == attr2->df_pref |
765 | && attr1->df_alg == attr2->df_alg | |
77e62f2b | 766 | && attr1->nh_ifindex == attr2->nh_ifindex |
7b7d48e5 | 767 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex |
e496b420 HS |
768 | && attr1->distance == attr2->distance |
769 | && srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) | |
ef3e0d04 | 770 | && srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) |
0789eb69 KM |
771 | && attr1->srte_color == attr2->srte_color |
772 | && attr1->nh_type == attr2->nh_type | |
773 | && attr1->bh_type == attr2->bh_type) | |
74df8d6d | 774 | return true; |
d62a17ae | 775 | } |
aadc0905 | 776 | |
74df8d6d | 777 | return false; |
718e3744 | 778 | } |
779 | ||
d62a17ae | 780 | static void attrhash_init(void) |
718e3744 | 781 | { |
996c9314 LB |
782 | attrhash = |
783 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 784 | } |
785 | ||
289d2501 LB |
786 | /* |
787 | * special for hash_clean below | |
788 | */ | |
d62a17ae | 789 | static void attr_vfree(void *attr) |
289d2501 | 790 | { |
2703b7db | 791 | bgp_attr_extra_free(attr); |
d62a17ae | 792 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
793 | } |
794 | ||
d62a17ae | 795 | static void attrhash_finish(void) |
228da428 | 796 | { |
d62a17ae | 797 | hash_clean(attrhash, attr_vfree); |
798 | hash_free(attrhash); | |
799 | attrhash = NULL; | |
228da428 CC |
800 | } |
801 | ||
e3b78da8 | 802 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 803 | { |
e3b78da8 | 804 | struct attr *attr = bucket->data; |
e496b420 | 805 | char sid_str[BUFSIZ]; |
718e3744 | 806 | |
23d0a753 | 807 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 HS |
808 | |
809 | sid_str[0] = '\0'; | |
810 | if (attr->srv6_l3vpn) | |
811 | inet_ntop(AF_INET6, &attr->srv6_l3vpn->sid, sid_str, BUFSIZ); | |
812 | else if (attr->srv6_vpn) | |
813 | inet_ntop(AF_INET6, &attr->srv6_vpn->sid, sid_str, BUFSIZ); | |
814 | ||
815 | vty_out(vty, | |
957f74c3 DS |
816 | "\tflags: %" PRIu64" distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %s\n", |
817 | attr->flag, attr->distance, attr->med, attr->local_pref, | |
818 | attr->origin, attr->weight, attr->label, sid_str); | |
718e3744 | 819 | } |
820 | ||
d62a17ae | 821 | void attr_show_all(struct vty *vty) |
718e3744 | 822 | { |
e3b78da8 | 823 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
824 | void *))attr_show_all_iterator, |
825 | vty); | |
718e3744 | 826 | } |
827 | ||
d62a17ae | 828 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 829 | { |
d62a17ae | 830 | struct attr *val = (struct attr *)p; |
831 | struct attr *attr; | |
718e3744 | 832 | |
d62a17ae | 833 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
834 | *attr = *val; | |
835 | if (val->encap_subtlvs) { | |
836 | val->encap_subtlvs = NULL; | |
837 | } | |
1e20238a | 838 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
839 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
840 | bgp_attr_get_vnc_subtlvs(val); | |
841 | ||
842 | if (vnc_subtlvs) | |
843 | bgp_attr_set_vnc_subtlvs(val, NULL); | |
65efcfce | 844 | #endif |
e496b420 | 845 | |
d62a17ae | 846 | attr->refcnt = 0; |
847 | return attr; | |
718e3744 | 848 | } |
849 | ||
850 | /* Internet argument attribute. */ | |
d62a17ae | 851 | struct attr *bgp_attr_intern(struct attr *attr) |
852 | { | |
853 | struct attr *find; | |
b53e67a3 DA |
854 | struct ecommunity *ecomm = NULL; |
855 | struct ecommunity *ipv6_ecomm = NULL; | |
d62a17ae | 856 | |
857 | /* Intern referenced strucutre. */ | |
858 | if (attr->aspath) { | |
859 | if (!attr->aspath->refcnt) | |
860 | attr->aspath = aspath_intern(attr->aspath); | |
861 | else | |
862 | attr->aspath->refcnt++; | |
863 | } | |
864 | if (attr->community) { | |
865 | if (!attr->community->refcnt) | |
866 | attr->community = community_intern(attr->community); | |
867 | else | |
868 | attr->community->refcnt++; | |
869 | } | |
870 | ||
b53e67a3 | 871 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
872 | if (ecomm) { |
873 | if (!ecomm->refcnt) | |
b53e67a3 | 874 | bgp_attr_set_ecommunity(attr, ecommunity_intern(ecomm)); |
9a659715 | 875 | else |
d04ac434 | 876 | ecomm->refcnt++; |
9a659715 PG |
877 | } |
878 | ||
b53e67a3 DA |
879 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
880 | if (ipv6_ecomm) { | |
881 | if (!ipv6_ecomm->refcnt) | |
882 | bgp_attr_set_ipv6_ecommunity( | |
883 | attr, ecommunity_intern(ipv6_ecomm)); | |
884 | else | |
885 | ipv6_ecomm->refcnt++; | |
886 | } | |
887 | ||
d62a17ae | 888 | if (attr->lcommunity) { |
889 | if (!attr->lcommunity->refcnt) | |
890 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
891 | else | |
892 | attr->lcommunity->refcnt++; | |
893 | } | |
779fee93 DS |
894 | |
895 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); | |
896 | ||
897 | if (cluster) { | |
898 | if (!cluster->refcnt) | |
899 | bgp_attr_set_cluster(attr, cluster_intern(cluster)); | |
d62a17ae | 900 | else |
779fee93 | 901 | cluster->refcnt++; |
d62a17ae | 902 | } |
04fb21e2 DS |
903 | |
904 | struct transit *transit = bgp_attr_get_transit(attr); | |
905 | ||
906 | if (transit) { | |
907 | if (!transit->refcnt) | |
908 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
d62a17ae | 909 | else |
04fb21e2 | 910 | transit->refcnt++; |
d62a17ae | 911 | } |
912 | if (attr->encap_subtlvs) { | |
913 | if (!attr->encap_subtlvs->refcnt) | |
914 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
915 | ENCAP_SUBTLV_TYPE); | |
916 | else | |
917 | attr->encap_subtlvs->refcnt++; | |
918 | } | |
e496b420 HS |
919 | if (attr->srv6_l3vpn) { |
920 | if (!attr->srv6_l3vpn->refcnt) | |
921 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
922 | else | |
923 | attr->srv6_l3vpn->refcnt++; | |
924 | } | |
925 | if (attr->srv6_vpn) { | |
926 | if (!attr->srv6_vpn->refcnt) | |
927 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
928 | else | |
929 | attr->srv6_vpn->refcnt++; | |
930 | } | |
1e20238a | 931 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
932 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
933 | bgp_attr_get_vnc_subtlvs(attr); | |
934 | ||
935 | if (vnc_subtlvs) { | |
936 | if (!vnc_subtlvs->refcnt) | |
937 | bgp_attr_set_vnc_subtlvs( | |
938 | attr, | |
939 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
d62a17ae | 940 | else |
91ebf12c | 941 | vnc_subtlvs->refcnt++; |
d62a17ae | 942 | } |
aadc0905 | 943 | #endif |
bede7744 | 944 | |
dbbac180 DL |
945 | /* At this point, attr only contains intern'd pointers. that means |
946 | * if we find it in attrhash, it has all the same pointers and we | |
947 | * correctly updated the refcounts on these. | |
948 | * If we don't find it, we need to allocate a one because in all | |
949 | * cases this returns a new reference to a hashed attr, but the input | |
950 | * wasn't on hash. */ | |
d62a17ae | 951 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
952 | find->refcnt++; | |
953 | ||
954 | return find; | |
718e3744 | 955 | } |
956 | ||
957 | /* Make network statement's attribute. */ | |
d7c0a89a | 958 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 959 | { |
d62a17ae | 960 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 961 | |
d62a17ae | 962 | attr->origin = origin; |
963 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
964 | attr->aspath = aspath_empty(); | |
965 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
966 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
967 | attr->tag = 0; | |
968 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
969 | attr->label = MPLS_INVALID_LABEL; | |
970 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
971 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
972 | ||
973 | return attr; | |
718e3744 | 974 | } |
975 | ||
b5d58c32 | 976 | /* Create the attributes for an aggregate */ |
5f040085 DS |
977 | struct attr *bgp_attr_aggregate_intern( |
978 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
979 | struct community *community, struct ecommunity *ecommunity, | |
980 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
981 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 982 | { |
983 | struct attr attr; | |
984 | struct attr *new; | |
20894f50 | 985 | int ret; |
d62a17ae | 986 | |
987 | memset(&attr, 0, sizeof(struct attr)); | |
988 | ||
989 | /* Origin attribute. */ | |
990 | attr.origin = origin; | |
991 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
992 | ||
993 | /* AS path attribute. */ | |
994 | if (aspath) | |
995 | attr.aspath = aspath_intern(aspath); | |
996 | else | |
997 | attr.aspath = aspath_empty(); | |
998 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
999 | ||
1000 | /* Next hop attribute. */ | |
1001 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1002 | ||
1003 | if (community) { | |
d7c0a89a | 1004 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
1005 | |
1006 | /* If we are not shutting down ourselves and we are | |
1007 | * aggregating a route that contains the GSHUT community we | |
1008 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 1009 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 1010 | && community_include(community, gshut)) { |
7f323236 DW |
1011 | community_del_val(community, &gshut); |
1012 | } | |
1013 | ||
d62a17ae | 1014 | attr.community = community; |
1015 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1016 | } | |
1017 | ||
3da2cc32 | 1018 | if (ecommunity) { |
b53e67a3 | 1019 | bgp_attr_set_ecommunity(&attr, ecommunity); |
3da2cc32 DS |
1020 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); |
1021 | } | |
1022 | ||
dd18c5a9 DS |
1023 | if (lcommunity) { |
1024 | attr.lcommunity = lcommunity; | |
1025 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
1026 | } | |
1027 | ||
637e5ba4 | 1028 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 1029 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 1030 | |
d62a17ae | 1031 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
1032 | attr.label = MPLS_INVALID_LABEL; | |
1033 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1034 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 1035 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 1036 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
1037 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1038 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1039 | attr.aggregator_as = bgp->confed_id; | |
1040 | else | |
1041 | attr.aggregator_as = bgp->as; | |
1042 | attr.aggregator_addr = bgp->router_id; | |
1043 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
1044 | attr.label = MPLS_INVALID_LABEL; | |
1045 | ||
20894f50 DA |
1046 | /* Apply route-map */ |
1047 | if (aggregate->rmap.name) { | |
1048 | struct attr attr_tmp = attr; | |
1049 | struct bgp_path_info rmap_path; | |
1050 | ||
1051 | memset(&rmap_path, 0, sizeof(struct bgp_path_info)); | |
1052 | rmap_path.peer = bgp->peer_self; | |
1053 | rmap_path.attr = &attr_tmp; | |
1054 | ||
1055 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1056 | ||
1782514f | 1057 | ret = route_map_apply(aggregate->rmap.map, p, &rmap_path); |
20894f50 DA |
1058 | |
1059 | bgp->peer_self->rmap_type = 0; | |
1060 | ||
1061 | if (ret == RMAP_DENYMATCH) { | |
1062 | /* Free uninterned attribute. */ | |
1063 | bgp_attr_flush(&attr_tmp); | |
1064 | ||
1065 | /* Unintern original. */ | |
1066 | aspath_unintern(&attr.aspath); | |
1067 | return NULL; | |
1068 | } | |
1069 | ||
637e5ba4 | 1070 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1071 | bgp_attr_add_gshut_community(&attr_tmp); |
1072 | ||
1073 | new = bgp_attr_intern(&attr_tmp); | |
1074 | } else { | |
1075 | ||
637e5ba4 | 1076 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1077 | bgp_attr_add_gshut_community(&attr); |
1078 | ||
1079 | new = bgp_attr_intern(&attr); | |
1080 | } | |
d62a17ae | 1081 | |
8bd0d3b1 RZ |
1082 | /* Always release the 'intern()'ed AS Path. */ |
1083 | aspath_unintern(&attr.aspath); | |
1084 | ||
d62a17ae | 1085 | return new; |
718e3744 | 1086 | } |
1087 | ||
b881c707 | 1088 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1089 | void bgp_attr_unintern_sub(struct attr *attr) |
1090 | { | |
b53e67a3 DA |
1091 | struct ecommunity *ecomm = NULL; |
1092 | struct ecommunity *ipv6_ecomm = NULL; | |
779fee93 | 1093 | struct cluster_list *cluster; |
d04ac434 | 1094 | |
d62a17ae | 1095 | /* aspath refcount shoud be decrement. */ |
1096 | if (attr->aspath) | |
1097 | aspath_unintern(&attr->aspath); | |
1098 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
1099 | ||
1100 | if (attr->community) | |
1101 | community_unintern(&attr->community); | |
1102 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
1103 | ||
b53e67a3 DA |
1104 | ecomm = bgp_attr_get_ecommunity(attr); |
1105 | ecommunity_unintern(&ecomm); | |
d62a17ae | 1106 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); |
b53e67a3 | 1107 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 1108 | |
b53e67a3 DA |
1109 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1110 | ecommunity_unintern(&ipv6_ecomm); | |
9a659715 | 1111 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES)); |
d04ac434 | 1112 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a659715 | 1113 | |
d62a17ae | 1114 | if (attr->lcommunity) |
1115 | lcommunity_unintern(&attr->lcommunity); | |
1116 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
1117 | ||
779fee93 DS |
1118 | cluster = bgp_attr_get_cluster(attr); |
1119 | if (cluster) { | |
1120 | cluster_unintern(&cluster); | |
1121 | bgp_attr_set_cluster(attr, cluster); | |
1122 | } | |
d62a17ae | 1123 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1124 | ||
04fb21e2 DS |
1125 | struct transit *transit = bgp_attr_get_transit(attr); |
1126 | ||
1127 | if (transit) { | |
1128 | transit_unintern(&transit); | |
1129 | bgp_attr_set_transit(attr, transit); | |
1130 | } | |
d62a17ae | 1131 | |
1132 | if (attr->encap_subtlvs) | |
1133 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1134 | |
1e20238a | 1135 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1136 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1137 | bgp_attr_get_vnc_subtlvs(attr); | |
1138 | ||
1139 | if (vnc_subtlvs) { | |
1140 | encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1141 | bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs); | |
1142 | } | |
bede7744 | 1143 | #endif |
e496b420 HS |
1144 | |
1145 | if (attr->srv6_l3vpn) | |
1146 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1147 | ||
1148 | if (attr->srv6_vpn) | |
1149 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1150 | } |
1151 | ||
718e3744 | 1152 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1153 | void bgp_attr_unintern(struct attr **pattr) |
1154 | { | |
1155 | struct attr *attr = *pattr; | |
1156 | struct attr *ret; | |
1157 | struct attr tmp; | |
1158 | ||
1159 | /* Decrement attribute reference. */ | |
1160 | attr->refcnt--; | |
1161 | ||
1162 | tmp = *attr; | |
1163 | ||
1164 | /* If reference becomes zero then free attribute object. */ | |
1165 | if (attr->refcnt == 0) { | |
1166 | ret = hash_release(attrhash, attr); | |
1167 | assert(ret != NULL); | |
f3634202 | 1168 | bgp_attr_extra_free(attr); |
d62a17ae | 1169 | XFREE(MTYPE_ATTR, attr); |
1170 | *pattr = NULL; | |
1171 | } | |
1172 | ||
1173 | bgp_attr_unintern_sub(&tmp); | |
1174 | } | |
1175 | ||
1176 | void bgp_attr_flush(struct attr *attr) | |
1177 | { | |
d04ac434 | 1178 | struct ecommunity *ecomm; |
b53e67a3 | 1179 | struct ecommunity *ipv6_ecomm; |
779fee93 | 1180 | struct cluster_list *cluster; |
d04ac434 | 1181 | |
d62a17ae | 1182 | if (attr->aspath && !attr->aspath->refcnt) { |
1183 | aspath_free(attr->aspath); | |
1184 | attr->aspath = NULL; | |
1185 | } | |
3c1f53de SMS |
1186 | if (attr->community && !attr->community->refcnt) |
1187 | community_free(&attr->community); | |
b53e67a3 | 1188 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
1189 | if (ecomm && !ecomm->refcnt) |
1190 | ecommunity_free(&ecomm); | |
b53e67a3 DA |
1191 | bgp_attr_set_ecommunity(attr, NULL); |
1192 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); | |
1193 | if (ipv6_ecomm && !ipv6_ecomm->refcnt) | |
1194 | ecommunity_free(&ipv6_ecomm); | |
d04ac434 | 1195 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
d62a17ae | 1196 | if (attr->lcommunity && !attr->lcommunity->refcnt) |
1197 | lcommunity_free(&attr->lcommunity); | |
779fee93 DS |
1198 | |
1199 | cluster = bgp_attr_get_cluster(attr); | |
1200 | if (cluster && !cluster->refcnt) { | |
1201 | cluster_free(cluster); | |
1202 | bgp_attr_set_cluster(attr, NULL); | |
d62a17ae | 1203 | } |
04fb21e2 DS |
1204 | |
1205 | struct transit *transit = bgp_attr_get_transit(attr); | |
1206 | ||
1207 | if (transit && !transit->refcnt) { | |
1208 | transit_free(transit); | |
1209 | bgp_attr_set_transit(attr, NULL); | |
d62a17ae | 1210 | } |
1211 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1212 | encap_free(attr->encap_subtlvs); | |
1213 | attr->encap_subtlvs = NULL; | |
1214 | } | |
b83127e1 HS |
1215 | if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) { |
1216 | srv6_l3vpn_free(attr->srv6_l3vpn); | |
1217 | attr->srv6_l3vpn = NULL; | |
1218 | } | |
1219 | if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) { | |
1220 | srv6_vpn_free(attr->srv6_vpn); | |
1221 | attr->srv6_vpn = NULL; | |
1222 | } | |
1e20238a | 1223 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1224 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1225 | bgp_attr_get_vnc_subtlvs(attr); | |
1226 | ||
1227 | if (vnc_subtlvs && !vnc_subtlvs->refcnt) { | |
1228 | encap_free(vnc_subtlvs); | |
1229 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 1230 | } |
aadc0905 | 1231 | #endif |
718e3744 | 1232 | } |
1233 | ||
b881c707 PJ |
1234 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1235 | * avoid resetting sessions for malformed attributes which are | |
1236 | * are partial/optional and hence where the error likely was not | |
1237 | * introduced by the sending neighbour. | |
1238 | */ | |
1239 | static bgp_attr_parse_ret_t | |
d7c0a89a | 1240 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1241 | bgp_size_t length) |
1242 | { | |
1243 | struct peer *const peer = args->peer; | |
599f7b33 | 1244 | struct attr *const attr = args->attr; |
d7c0a89a | 1245 | const uint8_t flags = args->flags; |
d62a17ae | 1246 | /* startp and length must be special-cased, as whether or not to |
1247 | * send the attribute data with the NOTIFY depends on the error, | |
1248 | * the caller therefore signals this with the seperate length argument | |
1249 | */ | |
d7c0a89a | 1250 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1251 | |
599f7b33 DA |
1252 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1253 | char attr_str[BUFSIZ] = {0}; | |
1254 | ||
99ab4d23 | 1255 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1256 | |
1257 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1258 | } | |
1259 | ||
d62a17ae | 1260 | /* Only relax error handling for eBGP peers */ |
1261 | if (peer->sort != BGP_PEER_EBGP) { | |
1262 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1263 | notify_datap, length); | |
1264 | return BGP_ATTR_PARSE_ERROR; | |
1265 | } | |
1266 | ||
1267 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1268 | * still proceed but the caller hasn't read all the attribute. | |
1269 | */ | |
1270 | stream_set_getp(BGP_INPUT(peer), | |
1271 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1272 | + args->total); | |
1273 | ||
1274 | switch (args->type) { | |
1275 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1276 | * affect route selection, and can be safely ignored, then any such | |
1277 | * attributes which are malformed should just be ignored and the route | |
1278 | * processed as normal. | |
1279 | */ | |
1280 | case BGP_ATTR_AS4_AGGREGATOR: | |
1281 | case BGP_ATTR_AGGREGATOR: | |
1282 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1283 | return BGP_ATTR_PARSE_PROCEED; | |
1284 | ||
1285 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1286 | * selection, should be treat-as-withdraw. |
d62a17ae | 1287 | */ |
1288 | case BGP_ATTR_ORIGIN: | |
1289 | case BGP_ATTR_AS_PATH: | |
1290 | case BGP_ATTR_NEXT_HOP: | |
1291 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1292 | case BGP_ATTR_LOCAL_PREF: | |
1293 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1294 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1295 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1296 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1297 | case BGP_ATTR_ORIGINATOR_ID: |
1298 | case BGP_ATTR_CLUSTER_LIST: | |
4ba5a9c5 | 1299 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1300 | case BGP_ATTR_MP_REACH_NLRI: |
1301 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1302 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1303 | notify_datap, length); | |
1304 | return BGP_ATTR_PARSE_ERROR; | |
1305 | } | |
1306 | ||
1307 | /* Partial optional attributes that are malformed should not cause | |
1308 | * the whole session to be reset. Instead treat it as a withdrawal | |
1309 | * of the routes, if possible. | |
1310 | */ | |
1311 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1312 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1313 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1314 | return BGP_ATTR_PARSE_WITHDRAW; | |
1315 | ||
1316 | /* default to reset */ | |
1317 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1318 | } |
1319 | ||
afcb7679 DO |
1320 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1321 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1322 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1323 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1324 | non-transitive" attribute. */ | |
1325 | static void | |
d62a17ae | 1326 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1327 | uint8_t desired_flags /* how RFC says it must be */ |
1328 | ) | |
d62a17ae | 1329 | { |
d7c0a89a QY |
1330 | uint8_t seen = 0, i; |
1331 | uint8_t real_flags = args->flags; | |
1332 | const uint8_t attr_code = args->type; | |
d62a17ae | 1333 | |
1334 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1335 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1336 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1337 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1338 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1339 | flog_err(EC_BGP_ATTR_FLAG, |
1340 | "%s attribute must%s be flagged as \"%s\"", | |
1341 | lookup_msg(attr_str, attr_code, NULL), | |
1342 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1343 | ? "" | |
1344 | : " not", | |
1345 | attr_flag_str[i].str); | |
d62a17ae | 1346 | seen = 1; |
1347 | } | |
1348 | if (!seen) { | |
1349 | zlog_debug( | |
3efd0893 | 1350 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1351 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1352 | real_flags, desired_flags); | |
1353 | } | |
afcb7679 DO |
1354 | } |
1355 | ||
3ecab4c8 PJ |
1356 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1357 | * as will PARTIAL for optional+transitive attributes. | |
1358 | */ | |
d7c0a89a QY |
1359 | const uint8_t attr_flags_values[] = { |
1360 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1361 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1362 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1363 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1364 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1365 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1366 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1367 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1368 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1369 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1370 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1371 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1372 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1373 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1374 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1375 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1376 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1377 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1378 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1379 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1380 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
9a659715 PG |
1381 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1382 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1383 | }; |
099111ef | 1384 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1385 | |
3dc339cd | 1386 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1387 | { |
d7c0a89a QY |
1388 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1389 | const uint8_t flags = args->flags; | |
1390 | const uint8_t attr_code = args->type; | |
d62a17ae | 1391 | |
1392 | /* there may be attributes we don't know about */ | |
1393 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1394 | return false; |
d62a17ae | 1395 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1396 | return false; |
d62a17ae | 1397 | |
1398 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1399 | * to | |
1400 | * 1." | |
1401 | */ | |
1402 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1403 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1404 | flog_err( |
e50f7cfd | 1405 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1406 | "%s well-known attributes must have transitive flag set (%x)", |
1407 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1408 | return true; |
d62a17ae | 1409 | } |
1410 | ||
1411 | /* "For well-known attributes and for optional non-transitive | |
1412 | * attributes, | |
1413 | * the Partial bit MUST be set to 0." | |
1414 | */ | |
1415 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1416 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1417 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1418 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1419 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1420 | return true; |
d62a17ae | 1421 | } |
1422 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1423 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1424 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1425 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1426 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1427 | return true; |
d62a17ae | 1428 | } |
1429 | } | |
1430 | ||
1431 | /* Optional transitive attributes may go through speakers that don't | |
1432 | * reocgnise them and set the Partial bit. | |
1433 | */ | |
1434 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1435 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1436 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1437 | ||
1438 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1439 | return false; |
d62a17ae | 1440 | |
1441 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1442 | return true; |
3ecab4c8 PJ |
1443 | } |
1444 | ||
718e3744 | 1445 | /* Get origin attribute of the update message. */ |
d62a17ae | 1446 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1447 | { | |
1448 | struct peer *const peer = args->peer; | |
1449 | struct attr *const attr = args->attr; | |
1450 | const bgp_size_t length = args->length; | |
1451 | ||
1452 | /* If any recognized attribute has Attribute Length that conflicts | |
1453 | with the expected length (based on the attribute type code), then | |
1454 | the Error Subcode is set to Attribute Length Error. The Data | |
1455 | field contains the erroneous attribute (type, length and | |
1456 | value). */ | |
1457 | if (length != 1) { | |
e50f7cfd | 1458 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1459 | "Origin attribute length is not one %d", length); |
d62a17ae | 1460 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1461 | args->total); | |
1462 | } | |
1463 | ||
1464 | /* Fetch origin attribute. */ | |
1465 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1466 | ||
1467 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1468 | Subcode is set to Invalid Origin Attribute. The Data field | |
1469 | contains the unrecognized attribute (type, length and value). */ | |
1470 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1471 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1472 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1473 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1474 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1475 | args->total); | |
1476 | } | |
1477 | ||
1478 | /* Set oring attribute flag. */ | |
1479 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1480 | ||
1481 | return 0; | |
718e3744 | 1482 | } |
ab005298 PJ |
1483 | |
1484 | /* Parse AS path information. This function is wrapper of | |
1485 | aspath_parse. */ | |
d62a17ae | 1486 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1487 | { | |
1488 | struct attr *const attr = args->attr; | |
1489 | struct peer *const peer = args->peer; | |
1490 | const bgp_size_t length = args->length; | |
1491 | ||
1492 | /* | |
1493 | * peer with AS4 => will get 4Byte ASnums | |
1494 | * otherwise, will get 16 Bit | |
1495 | */ | |
8cff42ad DA |
1496 | attr->aspath = aspath_parse( |
1497 | peer->curr, length, | |
1498 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) | |
1499 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)); | |
d62a17ae | 1500 | |
1501 | /* In case of IBGP, length will be zero. */ | |
1502 | if (!attr->aspath) { | |
e50f7cfd | 1503 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1504 | "Malformed AS path from %s, length is %d", peer->host, |
1505 | length); | |
d62a17ae | 1506 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1507 | 0); | |
1508 | } | |
0b2aa3a0 | 1509 | |
d62a17ae | 1510 | /* Set aspath attribute flag. */ |
1511 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1512 | ||
1513 | return BGP_ATTR_PARSE_PROCEED; | |
1514 | } | |
1515 | ||
1516 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1517 | struct attr *const attr) | |
1518 | { | |
1519 | /* These checks were part of bgp_attr_aspath, but with | |
1520 | * as4 we should to check aspath things when | |
1521 | * aspath synthesizing with as4_path has already taken place. | |
1522 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1523 | * not right. | |
1524 | * So do the checks later, i.e. here | |
1525 | */ | |
d62a17ae | 1526 | struct aspath *aspath; |
1527 | ||
1528 | /* Confederation sanity check. */ | |
1529 | if ((peer->sort == BGP_PEER_CONFED | |
1530 | && !aspath_left_confed_check(attr->aspath)) | |
1531 | || (peer->sort == BGP_PEER_EBGP | |
1532 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1533 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1534 | peer->host); |
4ba5a9c5 | 1535 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1536 | } |
cddb8112 | 1537 | |
d62a17ae | 1538 | /* First AS check for EBGP. */ |
47cbc09b | 1539 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1540 | if (peer->sort == BGP_PEER_EBGP |
1541 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1542 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1543 | "%s incorrect first AS (must be %u)", |
1544 | peer->host, peer->as); | |
4ba5a9c5 | 1545 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1546 | } |
1547 | } | |
0b2aa3a0 | 1548 | |
88cc0ce4 DA |
1549 | /* Codification of AS 0 Processing */ |
1550 | if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) { | |
1551 | flog_err( | |
1552 | EC_BGP_ATTR_MAL_AS_PATH, | |
1553 | "Malformed AS path, AS number is 0 in the path from %s", | |
1554 | peer->host); | |
1555 | return BGP_ATTR_PARSE_WITHDRAW; | |
1556 | } | |
1557 | ||
d62a17ae | 1558 | /* local-as prepend */ |
1559 | if (peer->change_local_as | |
1560 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1561 | aspath = aspath_dup(attr->aspath); | |
1562 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1563 | aspath_unintern(&attr->aspath); | |
1564 | attr->aspath = aspath_intern(aspath); | |
1565 | } | |
0b2aa3a0 | 1566 | |
d62a17ae | 1567 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1568 | } |
1569 | ||
ab005298 PJ |
1570 | /* Parse AS4 path information. This function is another wrapper of |
1571 | aspath_parse. */ | |
d62a17ae | 1572 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1573 | struct aspath **as4_path) | |
ab005298 | 1574 | { |
d62a17ae | 1575 | struct peer *const peer = args->peer; |
1576 | struct attr *const attr = args->attr; | |
1577 | const bgp_size_t length = args->length; | |
ab005298 | 1578 | |
424ab01d | 1579 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1580 | |
d62a17ae | 1581 | /* In case of IBGP, length will be zero. */ |
1582 | if (!*as4_path) { | |
e50f7cfd | 1583 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1584 | "Malformed AS4 path from %s, length is %d", peer->host, |
1585 | length); | |
d62a17ae | 1586 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1587 | 0); | |
1588 | } | |
ab005298 | 1589 | |
d62a17ae | 1590 | /* Set aspath attribute flag. */ |
1591 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1592 | ||
1593 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1594 | } |
1595 | ||
9738e9aa | 1596 | /* |
1597 | * Check that the nexthop attribute is valid. | |
1598 | */ | |
1599 | bgp_attr_parse_ret_t | |
1600 | bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr) | |
1601 | { | |
1602 | in_addr_t nexthop_h; | |
1603 | ||
1604 | nexthop_h = ntohl(attr->nexthop.s_addr); | |
1605 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1606 | || IPV4_CLASS_DE(nexthop_h)) | |
1607 | && !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) { | |
7decb30c | 1608 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1609 | char buf[INET_ADDRSTRLEN]; |
1610 | ||
1611 | inet_ntop(AF_INET, &attr->nexthop.s_addr, buf, | |
1612 | INET_ADDRSTRLEN); | |
1613 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", | |
1614 | buf); | |
7decb30c DS |
1615 | data[0] = BGP_ATTR_FLAG_TRANS; |
1616 | data[1] = BGP_ATTR_NEXT_HOP; | |
1617 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1618 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1619 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1620 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1621 | data, 7); | |
9738e9aa | 1622 | return BGP_ATTR_PARSE_ERROR; |
1623 | } | |
1624 | ||
1625 | return BGP_ATTR_PARSE_PROCEED; | |
1626 | } | |
1627 | ||
718e3744 | 1628 | /* Nexthop attribute. */ |
d62a17ae | 1629 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1630 | { | |
1631 | struct peer *const peer = args->peer; | |
1632 | struct attr *const attr = args->attr; | |
1633 | const bgp_size_t length = args->length; | |
1634 | ||
d62a17ae | 1635 | /* Check nexthop attribute length. */ |
1636 | if (length != 4) { | |
e50f7cfd | 1637 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1638 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1639 | |
1640 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1641 | args->total); | |
1642 | } | |
1643 | ||
88f33d66 | 1644 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1645 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1646 | ||
1647 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1648 | } |
1649 | ||
1650 | /* MED atrribute. */ | |
d62a17ae | 1651 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1652 | { |
d62a17ae | 1653 | struct peer *const peer = args->peer; |
1654 | struct attr *const attr = args->attr; | |
1655 | const bgp_size_t length = args->length; | |
b881c707 | 1656 | |
d62a17ae | 1657 | /* Length check. */ |
1658 | if (length != 4) { | |
e50f7cfd | 1659 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1660 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1661 | |
d62a17ae | 1662 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1663 | args->total); | |
1664 | } | |
1665 | ||
424ab01d | 1666 | attr->med = stream_getl(peer->curr); |
718e3744 | 1667 | |
d62a17ae | 1668 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1669 | |
d62a17ae | 1670 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1671 | } |
1672 | ||
1673 | /* Local preference attribute. */ | |
b881c707 | 1674 | static bgp_attr_parse_ret_t |
d62a17ae | 1675 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1676 | { | |
1677 | struct peer *const peer = args->peer; | |
1678 | struct attr *const attr = args->attr; | |
1679 | const bgp_size_t length = args->length; | |
1680 | ||
4ba5a9c5 DA |
1681 | /* if received from an internal neighbor, it SHALL be considered |
1682 | * malformed if its length is not equal to 4. If malformed, the | |
1683 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1684 | * withdraw". | |
1685 | */ | |
1686 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1687 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1688 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1689 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1690 | args->total); | |
1691 | } | |
1692 | ||
1693 | /* If it is contained in an UPDATE message that is received from an | |
1694 | external peer, then this attribute MUST be ignored by the | |
1695 | receiving speaker. */ | |
1696 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1697 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1698 | return BGP_ATTR_PARSE_PROCEED; |
1699 | } | |
1700 | ||
ad61f778 | 1701 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1702 | |
7f323236 | 1703 | /* Set the local-pref flag. */ |
d62a17ae | 1704 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1705 | ||
1706 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1707 | |
1708 | stream_failure: | |
1709 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1710 | args->total); | |
718e3744 | 1711 | } |
1712 | ||
1713 | /* Atomic aggregate. */ | |
d62a17ae | 1714 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1715 | { |
d62a17ae | 1716 | struct attr *const attr = args->attr; |
1717 | const bgp_size_t length = args->length; | |
1718 | ||
1719 | /* Length check. */ | |
1720 | if (length != 0) { | |
e50f7cfd | 1721 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1722 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1723 | length); | |
d62a17ae | 1724 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1725 | args->total); | |
1726 | } | |
718e3744 | 1727 | |
d62a17ae | 1728 | /* Set atomic aggregate flag. */ |
1729 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1730 | |
d62a17ae | 1731 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1732 | } |
1733 | ||
1734 | /* Aggregator attribute */ | |
d62a17ae | 1735 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1736 | { | |
1737 | struct peer *const peer = args->peer; | |
1738 | struct attr *const attr = args->attr; | |
1739 | const bgp_size_t length = args->length; | |
33d022bc | 1740 | as_t aggregator_as; |
d62a17ae | 1741 | |
1742 | int wantedlen = 6; | |
1743 | ||
1744 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1745 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1746 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1747 | wantedlen = 8; |
1748 | ||
1749 | if (length != wantedlen) { | |
e50f7cfd | 1750 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1751 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1752 | length); | |
d62a17ae | 1753 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1754 | args->total); | |
1755 | } | |
1756 | ||
1757 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
33d022bc | 1758 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1759 | else |
33d022bc DA |
1760 | aggregator_as = stream_getw(peer->curr); |
1761 | ||
e8364238 DA |
1762 | attr->aggregator_as = aggregator_as; |
1763 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1764 | ||
33d022bc | 1765 | /* Codification of AS 0 Processing */ |
4877b70b | 1766 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1767 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1768 | "%s: AGGREGATOR AS number is 0 for aspath: %s", |
1769 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1770 | |
1771 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1772 | char attr_str[BUFSIZ] = {0}; | |
1773 | ||
1774 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1775 | ||
1776 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1777 | } | |
1778 | } else { | |
8085c9a7 | 1779 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); |
4877b70b | 1780 | } |
33d022bc | 1781 | |
d62a17ae | 1782 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1783 | } |
1784 | ||
0b2aa3a0 | 1785 | /* New Aggregator attribute */ |
b881c707 | 1786 | static bgp_attr_parse_ret_t |
d62a17ae | 1787 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1788 | as_t *as4_aggregator_as, | |
1789 | struct in_addr *as4_aggregator_addr) | |
1790 | { | |
1791 | struct peer *const peer = args->peer; | |
1792 | struct attr *const attr = args->attr; | |
1793 | const bgp_size_t length = args->length; | |
33d022bc | 1794 | as_t aggregator_as; |
d62a17ae | 1795 | |
1796 | if (length != 8) { | |
1c50c1c0 QY |
1797 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1798 | length); | |
d62a17ae | 1799 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1800 | 0); | |
1801 | } | |
1802 | ||
33d022bc | 1803 | aggregator_as = stream_getl(peer->curr); |
0f2a703d | 1804 | |
e8364238 DA |
1805 | *as4_aggregator_as = aggregator_as; |
1806 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1807 | ||
0f2a703d | 1808 | /* Codification of AS 0 Processing */ |
4877b70b | 1809 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1810 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1811 | "%s: AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1812 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1813 | |
1814 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1815 | char attr_str[BUFSIZ] = {0}; | |
1816 | ||
1817 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1818 | ||
1819 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1820 | } | |
1821 | } else { | |
8085c9a7 | 1822 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); |
4877b70b | 1823 | } |
33d022bc | 1824 | |
d62a17ae | 1825 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1826 | } |
1827 | ||
1828 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1829 | */ | |
b881c707 | 1830 | static bgp_attr_parse_ret_t |
d62a17ae | 1831 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1832 | struct aspath *as4_path, as_t as4_aggregator, | |
1833 | struct in_addr *as4_aggregator_addr) | |
1834 | { | |
1835 | int ignore_as4_path = 0; | |
1836 | struct aspath *newpath; | |
1837 | ||
1838 | if (!attr->aspath) { | |
1839 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1840 | * have | |
1841 | * checked that all well-known, mandatory attributes were | |
1842 | * present. | |
1843 | * | |
1844 | * Can only be a problem with peer itself - hard error | |
1845 | */ | |
1846 | return BGP_ATTR_PARSE_ERROR; | |
1847 | } | |
1848 | ||
1849 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1850 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1851 | * if given. | |
1852 | * It is worth a warning though, because the peer really | |
1853 | * should not send them | |
1854 | */ | |
1855 | if (BGP_DEBUG(as4, AS4)) { | |
1856 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1857 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1858 | "AS4 capable peer, yet it sent"); | |
1859 | ||
1860 | if (attr->flag | |
1861 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1862 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1863 | peer->host, | |
1864 | "AS4 capable peer, yet it sent"); | |
1865 | } | |
1866 | ||
1867 | return BGP_ATTR_PARSE_PROCEED; | |
1868 | } | |
1869 | ||
1870 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1871 | * because that may override AS4_PATH | |
1872 | */ | |
1873 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1874 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1875 | /* received both. | |
1876 | * if the as_number in aggregator is not AS_TRANS, | |
1877 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1878 | * and the Aggregator shall be taken as | |
1879 | * info on the aggregating node, and the AS_PATH | |
1880 | * shall be taken as the AS_PATH | |
1881 | * otherwise | |
1882 | * the Aggregator shall be ignored and the | |
1883 | * AS4_AGGREGATOR shall be taken as the | |
1884 | * Aggregating node and the AS_PATH is to be | |
1885 | * constructed "as in all other cases" | |
1886 | */ | |
1887 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1888 | /* ignore */ | |
1889 | if (BGP_DEBUG(as4, AS4)) | |
1890 | zlog_debug( | |
3efd0893 | 1891 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 1892 | peer->host); |
1893 | ignore_as4_path = 1; | |
1894 | } else { | |
1895 | /* "New_aggregator shall be taken as aggregator" | |
1896 | */ | |
1897 | attr->aggregator_as = as4_aggregator; | |
1898 | attr->aggregator_addr.s_addr = | |
1899 | as4_aggregator_addr->s_addr; | |
1900 | } | |
1901 | } else { | |
1902 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1903 | * That is bogus - but reading the conditions | |
1904 | * we have to handle AS4_AGGREGATOR as if it were | |
1905 | * AGGREGATOR in that case | |
1906 | */ | |
1907 | if (BGP_DEBUG(as4, AS4)) | |
1908 | zlog_debug( | |
3efd0893 | 1909 | "[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 | 1910 | peer->host); |
1911 | attr->aggregator_as = as4_aggregator; | |
1912 | /* sweep it under the carpet and simulate a "good" | |
1913 | * AGGREGATOR */ | |
1914 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1919 | if (!ignore_as4_path | |
1920 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1921 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1922 | if (!newpath) |
1923 | return BGP_ATTR_PARSE_ERROR; | |
1924 | ||
d62a17ae | 1925 | aspath_unintern(&attr->aspath); |
1926 | attr->aspath = aspath_intern(newpath); | |
1927 | } | |
1928 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1929 | } |
1930 | ||
718e3744 | 1931 | /* Community attribute. */ |
b881c707 | 1932 | static bgp_attr_parse_ret_t |
d62a17ae | 1933 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1934 | { | |
1935 | struct peer *const peer = args->peer; | |
1936 | struct attr *const attr = args->attr; | |
1937 | const bgp_size_t length = args->length; | |
1938 | ||
1939 | if (length == 0) { | |
1940 | attr->community = NULL; | |
6680b550 DA |
1941 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
1942 | args->total); | |
d62a17ae | 1943 | } |
1944 | ||
1945 | attr->community = | |
d7c0a89a | 1946 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1947 | |
1948 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1949 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1950 | |
4ba5a9c5 DA |
1951 | /* The Community attribute SHALL be considered malformed if its |
1952 | * length is not a non-zero multiple of 4. | |
1953 | */ | |
d62a17ae | 1954 | if (!attr->community) |
1955 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1956 | args->total); | |
1957 | ||
1958 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1959 | ||
1960 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1961 | } |
1962 | ||
1963 | /* Originator ID attribute. */ | |
b881c707 | 1964 | static bgp_attr_parse_ret_t |
d62a17ae | 1965 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1966 | { |
d62a17ae | 1967 | struct peer *const peer = args->peer; |
1968 | struct attr *const attr = args->attr; | |
1969 | const bgp_size_t length = args->length; | |
718e3744 | 1970 | |
4ba5a9c5 DA |
1971 | /* if received from an internal neighbor, it SHALL be considered |
1972 | * malformed if its length is not equal to 4. If malformed, the | |
1973 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1974 | * withdraw". | |
1975 | */ | |
d62a17ae | 1976 | if (length != 4) { |
e50f7cfd | 1977 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 1978 | length); |
718e3744 | 1979 | |
d62a17ae | 1980 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1981 | args->total); | |
1982 | } | |
1983 | ||
424ab01d | 1984 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1985 | |
d62a17ae | 1986 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1987 | |
d62a17ae | 1988 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1989 | } |
1990 | ||
1991 | /* Cluster list attribute. */ | |
b881c707 | 1992 | static bgp_attr_parse_ret_t |
d62a17ae | 1993 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1994 | { |
d62a17ae | 1995 | struct peer *const peer = args->peer; |
1996 | struct attr *const attr = args->attr; | |
1997 | const bgp_size_t length = args->length; | |
1998 | ||
4ba5a9c5 DA |
1999 | /* if received from an internal neighbor, it SHALL be considered |
2000 | * malformed if its length is not a non-zero multiple of 4. If | |
2001 | * malformed, the UPDATE message SHALL be handled using the approach | |
2002 | * of "treat-as-withdraw". | |
2003 | */ | |
33ba22c2 | 2004 | if (length == 0 || length % 4) { |
1c50c1c0 | 2005 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 2006 | |
d62a17ae | 2007 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2008 | args->total); | |
2009 | } | |
2010 | ||
779fee93 DS |
2011 | bgp_attr_set_cluster( |
2012 | attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr), | |
2013 | length)); | |
718e3744 | 2014 | |
d62a17ae | 2015 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 2016 | stream_forward_getp(peer->curr, length); |
718e3744 | 2017 | |
d62a17ae | 2018 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 2019 | |
d62a17ae | 2020 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2021 | } |
2022 | ||
2023 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 2024 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
2025 | struct bgp_nlri *mp_update) | |
2026 | { | |
2027 | iana_afi_t pkt_afi; | |
2028 | afi_t afi; | |
5c525538 RW |
2029 | iana_safi_t pkt_safi; |
2030 | safi_t safi; | |
d62a17ae | 2031 | bgp_size_t nlri_len; |
2032 | size_t start; | |
2033 | struct stream *s; | |
2034 | struct peer *const peer = args->peer; | |
2035 | struct attr *const attr = args->attr; | |
2036 | const bgp_size_t length = args->length; | |
2037 | ||
2038 | /* Set end of packet. */ | |
2039 | s = BGP_INPUT(peer); | |
2040 | start = stream_get_getp(s); | |
2041 | ||
2042 | /* safe to read statically sized header? */ | |
6e4ab12f | 2043 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 2044 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 2045 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
2046 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
2047 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 2048 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2049 | } | |
2050 | ||
2051 | /* Load AFI, SAFI. */ | |
2052 | pkt_afi = stream_getw(s); | |
2053 | pkt_safi = stream_getc(s); | |
2054 | ||
2055 | /* Convert AFI, SAFI to internal values, check. */ | |
2056 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2057 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2058 | * unless | |
2059 | * the attribute is otherwise malformed. | |
2060 | */ | |
2061 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2062 | zlog_debug( | |
4cb5e18b | 2063 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
2064 | peer->host, iana_afi2str(pkt_afi), |
2065 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2066 | return BGP_ATTR_PARSE_ERROR; |
2067 | } | |
2068 | ||
2069 | /* Get nexthop length. */ | |
2070 | attr->mp_nexthop_len = stream_getc(s); | |
2071 | ||
2072 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
2073 | zlog_info( | |
4cb5e18b | 2074 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 2075 | __func__, peer->host, attr->mp_nexthop_len); |
2076 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2077 | } | |
2078 | ||
2079 | /* Nexthop length check. */ | |
2080 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2081 | case 0: |
2082 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2083 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2084 | __func__, peer->host, attr->mp_nexthop_len); |
2085 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2086 | } | |
2087 | break; | |
b6453163 LB |
2088 | case BGP_ATTR_NHLEN_VPNV4: |
2089 | stream_getl(s); /* RD high */ | |
2090 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2091 | /* |
2092 | * NOTE: intentional fall through | |
2093 | * - for consistency in rx processing | |
2094 | * | |
2095 | * The following comment is to signal GCC this intention | |
0437e105 | 2096 | * and suppress the warning |
996c9314 LB |
2097 | */ |
2098 | /* FALLTHRU */ | |
d62a17ae | 2099 | case BGP_ATTR_NHLEN_IPV4: |
2100 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2101 | /* Probably needed for RFC 2283 */ | |
975a328e | 2102 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2103 | memcpy(&attr->nexthop.s_addr, |
2104 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2105 | break; | |
d62a17ae | 2106 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2107 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2108 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2109 | stream_getl(s); /* RD high */ | |
2110 | stream_getl(s); /* RD low */ | |
2111 | } | |
2112 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2113 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2114 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2115 | 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 |
2116 | peer->host); |
2117 | return BGP_ATTR_PARSE_WITHDRAW; | |
2118 | } | |
77e62f2b | 2119 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2120 | } |
d62a17ae | 2121 | break; |
2122 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2123 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2124 | if (attr->mp_nexthop_len | |
2125 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2126 | stream_getl(s); /* RD high */ | |
2127 | stream_getl(s); /* RD low */ | |
2128 | } | |
2129 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2130 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2131 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2132 | 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 |
2133 | peer->host); |
2134 | return BGP_ATTR_PARSE_WITHDRAW; | |
2135 | } | |
77e62f2b | 2136 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2137 | } |
d62a17ae | 2138 | if (attr->mp_nexthop_len |
2139 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2140 | stream_getl(s); /* RD high */ | |
2141 | stream_getl(s); /* RD low */ | |
2142 | } | |
2143 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2144 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
d62a17ae | 2145 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2146 | zlog_debug( | |
c0d72166 DS |
2147 | "%s sent next-hops %pI6 and %pI6. Ignoring non-LL value", |
2148 | peer->host, &attr->mp_nexthop_global, | |
2149 | &attr->mp_nexthop_local); | |
d62a17ae | 2150 | |
2151 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2152 | } | |
17cdd31e | 2153 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2154 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2155 | peer->host); |
2156 | return BGP_ATTR_PARSE_WITHDRAW; | |
2157 | } | |
77e62f2b | 2158 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2159 | break; |
2160 | default: | |
4cb5e18b | 2161 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2162 | __func__, peer->host, attr->mp_nexthop_len); |
2163 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2164 | } | |
2165 | ||
2166 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2167 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2168 | __func__, peer->host); | |
d62a17ae | 2169 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2170 | } | |
2171 | ||
718e3744 | 2172 | { |
d7c0a89a | 2173 | uint8_t val; |
d62a17ae | 2174 | if ((val = stream_getc(s))) |
ade6974d | 2175 | flog_warn( |
e50f7cfd | 2176 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2177 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2178 | peer->host, val); | |
d62a17ae | 2179 | } |
2180 | ||
2181 | /* must have nrli_len, what is left of the attribute */ | |
2182 | nlri_len = LEN_LEFT; | |
9b9df989 | 2183 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2184 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2185 | __func__, peer->host); | |
d62a17ae | 2186 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2187 | } | |
2188 | ||
9b9df989 | 2189 | if (!nlri_len) { |
4cb5e18b | 2190 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2191 | __func__, peer->host); |
2192 | ||
2193 | mp_update->afi = afi; | |
2194 | mp_update->safi = safi; | |
2195 | return BGP_ATTR_PARSE_EOR; | |
2196 | } | |
2197 | ||
d62a17ae | 2198 | mp_update->afi = afi; |
2199 | mp_update->safi = safi; | |
2200 | mp_update->nlri = stream_pnt(s); | |
2201 | mp_update->length = nlri_len; | |
2202 | ||
2203 | stream_forward_getp(s, nlri_len); | |
2204 | ||
2205 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2206 | ||
2207 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2208 | #undef LEN_LEFT |
718e3744 | 2209 | } |
2210 | ||
2211 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2212 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2213 | struct bgp_nlri *mp_withdraw) | |
2214 | { | |
2215 | struct stream *s; | |
2216 | iana_afi_t pkt_afi; | |
2217 | afi_t afi; | |
5c525538 RW |
2218 | iana_safi_t pkt_safi; |
2219 | safi_t safi; | |
d7c0a89a | 2220 | uint16_t withdraw_len; |
d62a17ae | 2221 | struct peer *const peer = args->peer; |
2222 | struct attr *const attr = args->attr; | |
2223 | const bgp_size_t length = args->length; | |
9cabb64b | 2224 | |
424ab01d | 2225 | s = peer->curr; |
9cabb64b | 2226 | |
d62a17ae | 2227 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2228 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2229 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2230 | ||
2231 | pkt_afi = stream_getw(s); | |
2232 | pkt_safi = stream_getc(s); | |
2233 | ||
2234 | /* Convert AFI, SAFI to internal values, check. */ | |
2235 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2236 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2237 | * unless | |
2238 | * the attribute is otherwise malformed. | |
2239 | */ | |
2240 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2241 | zlog_debug( | |
748a041f DS |
2242 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2243 | peer->host, iana_afi2str(pkt_afi), | |
2244 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2245 | return BGP_ATTR_PARSE_ERROR; |
2246 | } | |
718e3744 | 2247 | |
d62a17ae | 2248 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2249 | |
d62a17ae | 2250 | mp_withdraw->afi = afi; |
2251 | mp_withdraw->safi = safi; | |
2252 | mp_withdraw->nlri = stream_pnt(s); | |
2253 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2254 | |
d62a17ae | 2255 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2256 | |
d62a17ae | 2257 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2258 | ||
2259 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2260 | } |
2261 | ||
57d187bc JS |
2262 | /* Large Community attribute. */ |
2263 | static bgp_attr_parse_ret_t | |
d62a17ae | 2264 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2265 | { | |
2266 | struct peer *const peer = args->peer; | |
2267 | struct attr *const attr = args->attr; | |
2268 | const bgp_size_t length = args->length; | |
2269 | ||
2270 | /* | |
2271 | * Large community follows new attribute format. | |
2272 | */ | |
2273 | if (length == 0) { | |
2274 | attr->lcommunity = NULL; | |
2275 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2276 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2277 | args->total); | |
d62a17ae | 2278 | } |
57d187bc | 2279 | |
c4efd0f4 | 2280 | attr->lcommunity = lcommunity_parse(stream_pnt(peer->curr), length); |
d62a17ae | 2281 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2282 | stream_forward_getp(peer->curr, length); |
57d187bc | 2283 | |
d62a17ae | 2284 | if (!attr->lcommunity) |
2285 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2286 | args->total); | |
57d187bc | 2287 | |
d62a17ae | 2288 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 2289 | |
d62a17ae | 2290 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
2291 | } |
2292 | ||
718e3744 | 2293 | /* Extended Community attribute. */ |
b881c707 | 2294 | static bgp_attr_parse_ret_t |
d62a17ae | 2295 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2296 | { | |
2297 | struct peer *const peer = args->peer; | |
2298 | struct attr *const attr = args->attr; | |
2299 | const bgp_size_t length = args->length; | |
d7c0a89a | 2300 | uint8_t sticky = 0; |
7904e9fd | 2301 | bool proxy = false; |
b53e67a3 | 2302 | struct ecommunity *ecomm; |
d62a17ae | 2303 | |
2304 | if (length == 0) { | |
b53e67a3 | 2305 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 2306 | /* Empty extcomm doesn't seem to be invalid per se */ |
6680b550 DA |
2307 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2308 | args->total); | |
d62a17ae | 2309 | } |
2310 | ||
b53e67a3 | 2311 | ecomm = ecommunity_parse( |
27aa23a4 DA |
2312 | stream_pnt(peer->curr), length, |
2313 | CHECK_FLAG(peer->flags, | |
2314 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
b53e67a3 | 2315 | bgp_attr_set_ecommunity(attr, ecomm); |
d62a17ae | 2316 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2317 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2318 | |
4ba5a9c5 DA |
2319 | /* The Extended Community attribute SHALL be considered malformed if |
2320 | * its length is not a non-zero multiple of 8. | |
2321 | */ | |
b53e67a3 | 2322 | if (!bgp_attr_get_ecommunity(attr)) |
d62a17ae | 2323 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2324 | args->total); | |
2325 | ||
2326 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
2327 | ||
74e2bd89 AK |
2328 | /* Extract DF election preference and mobility sequence number */ |
2329 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2330 | ||
d62a17ae | 2331 | /* Extract MAC mobility sequence number, if any. */ |
2332 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2333 | attr->sticky = sticky; | |
2334 | ||
ead40654 MK |
2335 | /* Check if this is a Gateway MAC-IP advertisement */ |
2336 | attr->default_gw = bgp_attr_default_gw(attr); | |
2337 | ||
68e33151 CS |
2338 | /* Handle scenario where router flag ecommunity is not |
2339 | * set but default gw ext community is present. | |
2340 | * Use default gateway, set and propogate R-bit. | |
2341 | */ | |
2342 | if (attr->default_gw) | |
2343 | attr->router_flag = 1; | |
2344 | ||
2345 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2346 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2347 | if (proxy) | |
2348 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2349 | |
bc59a672 | 2350 | /* Extract the Rmac, if any */ |
eee353c5 | 2351 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
c0d72166 DS |
2352 | if (bgp_debug_update(peer, NULL, NULL, 1) |
2353 | && bgp_mac_exist(&attr->rmac)) | |
2354 | zlog_debug("%s: router mac %pEA is self mac", __func__, | |
2355 | &attr->rmac); | |
eee353c5 | 2356 | } |
bc59a672 | 2357 | |
f4bd90c5 LK |
2358 | /* Get the tunnel type from encap extended community */ |
2359 | bgp_attr_extcom_tunnel_type(attr, | |
2360 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2361 | ||
d901dc13 | 2362 | /* Extract link bandwidth, if any. */ |
b53e67a3 DA |
2363 | (void)ecommunity_linkbw_present(bgp_attr_get_ecommunity(attr), |
2364 | &attr->link_bw); | |
d901dc13 | 2365 | |
d62a17ae | 2366 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2367 | } |
2368 | ||
9a659715 PG |
2369 | /* IPv6 Extended Community attribute. */ |
2370 | static bgp_attr_parse_ret_t | |
2371 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) | |
2372 | { | |
2373 | struct peer *const peer = args->peer; | |
2374 | struct attr *const attr = args->attr; | |
2375 | const bgp_size_t length = args->length; | |
d04ac434 | 2376 | struct ecommunity *ipv6_ecomm = NULL; |
9a659715 PG |
2377 | |
2378 | if (length == 0) { | |
d04ac434 | 2379 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
c6423c31 PG |
2380 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2381 | args->total); | |
9a659715 PG |
2382 | } |
2383 | ||
27aa23a4 DA |
2384 | ipv6_ecomm = ecommunity_parse_ipv6( |
2385 | stream_pnt(peer->curr), length, | |
2386 | CHECK_FLAG(peer->flags, | |
2387 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d04ac434 DS |
2388 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
2389 | ||
9a659715 PG |
2390 | /* XXX: fix ecommunity_parse to use stream API */ |
2391 | stream_forward_getp(peer->curr, length); | |
2392 | ||
d04ac434 | 2393 | if (!ipv6_ecomm) |
9a659715 PG |
2394 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2395 | args->total); | |
2396 | ||
2397 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES); | |
2398 | ||
2399 | return BGP_ATTR_PARSE_PROCEED; | |
2400 | } | |
2401 | ||
f4c89855 | 2402 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2403 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2404 | bgp_size_t length, /* IN: attr's length field */ | |
2405 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2406 | uint8_t flag, /* IN: attr's flags field */ |
2407 | uint8_t *startp) | |
d62a17ae | 2408 | { |
2409 | bgp_size_t total; | |
d62a17ae | 2410 | uint16_t tunneltype = 0; |
2411 | ||
2412 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2413 | ||
2414 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2415 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2416 | zlog_info( | |
2417 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2418 | flag); | |
2419 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2420 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2421 | startp, total); | |
2422 | return -1; | |
2423 | } | |
2424 | ||
2425 | if (BGP_ATTR_ENCAP == type) { | |
2426 | /* read outer TLV type and length */ | |
2427 | uint16_t tlv_length; | |
2428 | ||
2429 | if (length < 4) { | |
2430 | zlog_info( | |
2431 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2432 | bgp_notify_send_with_data( | |
2433 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2434 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2435 | return -1; | |
2436 | } | |
2437 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2438 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2439 | length -= 4; | |
2440 | ||
2441 | if (tlv_length != length) { | |
4cb5e18b NT |
2442 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2443 | __func__, tlv_length, length); | |
d62a17ae | 2444 | } |
2445 | } | |
2446 | ||
2447 | while (length >= 4) { | |
2448 | uint16_t subtype = 0; | |
2449 | uint16_t sublength = 0; | |
2450 | struct bgp_attr_encap_subtlv *tlv; | |
2451 | ||
2452 | if (BGP_ATTR_ENCAP == type) { | |
2453 | subtype = stream_getc(BGP_INPUT(peer)); | |
2454 | sublength = stream_getc(BGP_INPUT(peer)); | |
2455 | length -= 2; | |
1e20238a | 2456 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2457 | } else { |
2458 | subtype = stream_getw(BGP_INPUT(peer)); | |
2459 | sublength = stream_getw(BGP_INPUT(peer)); | |
2460 | length -= 4; | |
65efcfce | 2461 | #endif |
d62a17ae | 2462 | } |
2463 | ||
2464 | if (sublength > length) { | |
2465 | zlog_info( | |
2466 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2467 | sublength, length); | |
2468 | bgp_notify_send_with_data( | |
2469 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2470 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2471 | return -1; | |
2472 | } | |
2473 | ||
2474 | /* alloc and copy sub-tlv */ | |
2475 | /* TBD make sure these are freed when attributes are released */ | |
2476 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2477 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2478 | tlv->type = subtype; |
2479 | tlv->length = sublength; | |
424ab01d | 2480 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2481 | length -= sublength; |
2482 | ||
2483 | /* attach tlv to encap chain */ | |
2484 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2485 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2486 | for (stlv_last = attr->encap_subtlvs; |
2487 | stlv_last && stlv_last->next; | |
2488 | stlv_last = stlv_last->next) | |
2489 | ; | |
2490 | if (stlv_last) { | |
2491 | stlv_last->next = tlv; | |
2492 | } else { | |
2493 | attr->encap_subtlvs = tlv; | |
2494 | } | |
1e20238a | 2495 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2496 | } else { |
e4002056 | 2497 | struct bgp_attr_encap_subtlv *stlv_last; |
91ebf12c DS |
2498 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
2499 | bgp_attr_get_vnc_subtlvs(attr); | |
2500 | ||
2501 | for (stlv_last = vnc_subtlvs; | |
d62a17ae | 2502 | stlv_last && stlv_last->next; |
2503 | stlv_last = stlv_last->next) | |
2504 | ; | |
91ebf12c | 2505 | if (stlv_last) |
d62a17ae | 2506 | stlv_last->next = tlv; |
91ebf12c DS |
2507 | else |
2508 | bgp_attr_set_vnc_subtlvs(attr, tlv); | |
aadc0905 | 2509 | #endif |
d62a17ae | 2510 | } |
d62a17ae | 2511 | } |
f4c89855 | 2512 | |
d62a17ae | 2513 | if (BGP_ATTR_ENCAP == type) { |
2514 | attr->encap_tunneltype = tunneltype; | |
2515 | } | |
f4c89855 | 2516 | |
d62a17ae | 2517 | if (length) { |
2518 | /* spurious leftover data */ | |
2519 | zlog_info( | |
2520 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2521 | length); | |
2522 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2523 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2524 | startp, total); | |
2525 | return -1; | |
2526 | } | |
f4c89855 | 2527 | |
d62a17ae | 2528 | return 0; |
f4c89855 LB |
2529 | } |
2530 | ||
73604f82 RS |
2531 | |
2532 | /* SRv6 Service Data Sub-Sub-TLV attribute | |
2533 | * draft-ietf-bess-srv6-services-07 | |
2534 | */ | |
2535 | static bgp_attr_parse_ret_t | |
2536 | bgp_attr_srv6_service_data(struct bgp_attr_parser_args *args) | |
2537 | { | |
2538 | struct peer *const peer = args->peer; | |
9299fd00 | 2539 | struct attr *const attr = args->attr; |
73604f82 RS |
2540 | uint8_t type, loc_block_len, loc_node_len, func_len, arg_len, |
2541 | transposition_len, transposition_offset; | |
2542 | uint16_t length; | |
2543 | size_t headersz = sizeof(type) + sizeof(length); | |
2544 | ||
2545 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2546 | flog_err( | |
2547 | EC_BGP_ATTR_LEN, | |
2548 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2549 | headersz, STREAM_READABLE(peer->curr)); | |
2550 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2551 | args->total); | |
2552 | } | |
2553 | ||
2554 | type = stream_getc(peer->curr); | |
2555 | length = stream_getw(peer->curr); | |
2556 | ||
2557 | if (STREAM_READABLE(peer->curr) < length) { | |
2558 | flog_err( | |
2559 | EC_BGP_ATTR_LEN, | |
2560 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2561 | length, STREAM_READABLE(peer->curr)); | |
2562 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2563 | args->total); | |
2564 | } | |
2565 | ||
2566 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE) { | |
2567 | loc_block_len = stream_getc(peer->curr); | |
2568 | loc_node_len = stream_getc(peer->curr); | |
2569 | func_len = stream_getc(peer->curr); | |
2570 | arg_len = stream_getc(peer->curr); | |
2571 | transposition_len = stream_getc(peer->curr); | |
2572 | transposition_offset = stream_getc(peer->curr); | |
2573 | ||
2574 | /* Log SRv6 Service Data Sub-Sub-TLV */ | |
2575 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2576 | zlog_debug( | |
2577 | "%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", | |
2578 | __func__, loc_block_len, loc_node_len, func_len, | |
2579 | arg_len, transposition_len, | |
2580 | transposition_offset); | |
2581 | } | |
9299fd00 RS |
2582 | |
2583 | attr->srv6_l3vpn->loc_block_len = loc_block_len; | |
2584 | attr->srv6_l3vpn->loc_node_len = loc_node_len; | |
2585 | attr->srv6_l3vpn->func_len = func_len; | |
2586 | attr->srv6_l3vpn->arg_len = arg_len; | |
2587 | attr->srv6_l3vpn->transposition_len = transposition_len; | |
2588 | attr->srv6_l3vpn->transposition_offset = transposition_offset; | |
73604f82 RS |
2589 | } |
2590 | ||
2591 | else { | |
2592 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2593 | zlog_debug( | |
2594 | "%s attr SRv6 Service Data Sub-Sub-TLV sub-sub-type=%u is not supported, skipped", | |
2595 | peer->host, type); | |
2596 | ||
2597 | stream_forward_getp(peer->curr, length); | |
2598 | } | |
2599 | ||
2600 | return BGP_ATTR_PARSE_PROCEED; | |
2601 | } | |
2602 | ||
2603 | /* SRv6 Service Sub-TLV attribute | |
2604 | * draft-ietf-bess-srv6-services-07 | |
2605 | */ | |
2606 | static bgp_attr_parse_ret_t | |
2607 | bgp_attr_srv6_service(struct bgp_attr_parser_args *args) | |
2608 | { | |
2609 | struct peer *const peer = args->peer; | |
2610 | struct attr *const attr = args->attr; | |
2611 | struct in6_addr ipv6_sid; | |
2612 | uint8_t type, sid_flags; | |
2613 | uint16_t length, endpoint_behavior; | |
2614 | size_t headersz = sizeof(type) + sizeof(length); | |
9299fd00 | 2615 | bgp_attr_parse_ret_t err; |
73604f82 RS |
2616 | char buf[BUFSIZ]; |
2617 | ||
2618 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2619 | flog_err( | |
2620 | EC_BGP_ATTR_LEN, | |
2621 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2622 | headersz, STREAM_READABLE(peer->curr)); | |
2623 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2624 | args->total); | |
2625 | } | |
2626 | ||
2627 | type = stream_getc(peer->curr); | |
2628 | length = stream_getw(peer->curr); | |
2629 | ||
2630 | if (STREAM_READABLE(peer->curr) < length) { | |
2631 | flog_err( | |
2632 | EC_BGP_ATTR_LEN, | |
2633 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2634 | length, STREAM_READABLE(peer->curr)); | |
2635 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2636 | args->total); | |
2637 | } | |
2638 | ||
2639 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO) { | |
2640 | stream_getc(peer->curr); | |
2641 | stream_get(&ipv6_sid, peer->curr, sizeof(ipv6_sid)); | |
2642 | sid_flags = stream_getc(peer->curr); | |
2643 | endpoint_behavior = stream_getw(peer->curr); | |
2644 | stream_getc(peer->curr); | |
2645 | ||
2646 | /* Log SRv6 Service Sub-TLV */ | |
2647 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2648 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2649 | zlog_debug( | |
2650 | "%s: srv6-l3-srv sid %s, sid-flags 0x%02x, end-behaviour 0x%04x", | |
2651 | __func__, buf, sid_flags, endpoint_behavior); | |
2652 | } | |
2653 | ||
2654 | /* Configure from Info */ | |
2655 | if (attr->srv6_l3vpn) { | |
2656 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2657 | "Prefix SID SRv6 L3VPN field repeated"); | |
2658 | return bgp_attr_malformed( | |
2659 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2660 | } | |
2661 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, | |
2662 | sizeof(struct bgp_attr_srv6_l3vpn)); | |
9299fd00 | 2663 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); |
73604f82 RS |
2664 | attr->srv6_l3vpn->sid_flags = sid_flags; |
2665 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
9299fd00 RS |
2666 | attr->srv6_l3vpn->loc_block_len = 0; |
2667 | attr->srv6_l3vpn->loc_node_len = 0; | |
2668 | attr->srv6_l3vpn->func_len = 0; | |
2669 | attr->srv6_l3vpn->arg_len = 0; | |
2670 | attr->srv6_l3vpn->transposition_len = 0; | |
2671 | attr->srv6_l3vpn->transposition_offset = 0; | |
73604f82 RS |
2672 | |
2673 | // Sub-Sub-TLV found | |
9299fd00 RS |
2674 | if (length > BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { |
2675 | err = bgp_attr_srv6_service_data(args); | |
2676 | ||
2677 | if (err != BGP_ATTR_PARSE_PROCEED) | |
2678 | return err; | |
2679 | } | |
2680 | ||
2681 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
73604f82 RS |
2682 | } |
2683 | ||
2684 | /* Placeholder code for unsupported type */ | |
2685 | else { | |
2686 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2687 | zlog_debug( | |
2688 | "%s attr SRv6 Service Sub-TLV sub-type=%u is not supported, skipped", | |
2689 | peer->host, type); | |
2690 | ||
2691 | stream_forward_getp(peer->curr, length); | |
2692 | } | |
2693 | ||
2694 | return BGP_ATTR_PARSE_PROCEED; | |
2695 | } | |
2696 | ||
30adbd4e DS |
2697 | /* |
2698 | * Read an individual SID value returning how much data we have read | |
2699 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2700 | */ |
f69aeb76 | 2701 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(uint8_t type, uint16_t length, |
45a06b11 | 2702 | struct bgp_attr_parser_args *args) |
d62a17ae | 2703 | { |
2704 | struct peer *const peer = args->peer; | |
2705 | struct attr *const attr = args->attr; | |
d7c0a89a | 2706 | uint32_t label_index; |
d62a17ae | 2707 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2708 | uint32_t srgb_base; |
2709 | uint32_t srgb_range; | |
d62a17ae | 2710 | int srgb_count; |
e496b420 | 2711 | uint8_t sid_type, sid_flags; |
e496b420 | 2712 | char buf[BUFSIZ]; |
d62a17ae | 2713 | |
d62a17ae | 2714 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2715 | if (STREAM_READABLE(peer->curr) < length |
2716 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2717 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2718 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2719 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2720 | return bgp_attr_malformed(args, |
2721 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2722 | args->total); | |
d62a17ae | 2723 | } |
2724 | ||
2725 | /* Ignore flags and reserved */ | |
424ab01d QY |
2726 | stream_getc(peer->curr); |
2727 | stream_getw(peer->curr); | |
d62a17ae | 2728 | |
2729 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2730 | label_index = stream_getl(peer->curr); |
d62a17ae | 2731 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2732 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2733 | args->total); | |
d62a17ae | 2734 | |
2735 | /* Store label index; subsequently, we'll check on | |
2736 | * address-family */ | |
2737 | attr->label_index = label_index; | |
d62a17ae | 2738 | } |
2739 | ||
2740 | /* Placeholder code for the IPv6 SID type */ | |
2741 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
2742 | if (STREAM_READABLE(peer->curr) < length |
2743 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2744 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2745 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 2746 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
2747 | return bgp_attr_malformed(args, |
2748 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2749 | args->total); | |
d62a17ae | 2750 | } |
2751 | ||
2752 | /* Ignore reserved */ | |
424ab01d QY |
2753 | stream_getc(peer->curr); |
2754 | stream_getw(peer->curr); | |
d62a17ae | 2755 | |
424ab01d | 2756 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2757 | } |
2758 | ||
2759 | /* Placeholder code for the Originator SRGB type */ | |
2760 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
2761 | /* |
2762 | * ietf-idr-bgp-prefix-sid-05: | |
2763 | * Length is the total length of the value portion of the | |
2764 | * TLV: 2 + multiple of 6. | |
2765 | * | |
2766 | * peer->curr stream readp should be at the beginning of the 16 | |
2767 | * bit flag field at this point in the code. | |
2768 | */ | |
d62a17ae | 2769 | |
473046ee QY |
2770 | /* |
2771 | * Check that the TLV length field is sane: at least 2 bytes of | |
2772 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
2773 | */ | |
2774 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
2775 | flog_err( | |
2776 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2777 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
2778 | length, |
2779 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2780 | return bgp_attr_malformed( | |
2781 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2782 | args->total); | |
2783 | } | |
d62a17ae | 2784 | |
473046ee QY |
2785 | /* |
2786 | * Check that we actually have at least as much data as | |
2787 | * specified by the length field | |
2788 | */ | |
2789 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 2790 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2791 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 2792 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
2793 | return bgp_attr_malformed( |
2794 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2795 | args->total); | |
2796 | } | |
2797 | ||
473046ee QY |
2798 | /* |
2799 | * Check that the portion of the TLV containing the sequence of | |
2800 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
2801 | * that length, we skip the 16 bit flags field | |
2802 | */ | |
424ab01d | 2803 | stream_getw(peer->curr); |
d62a17ae | 2804 | length -= 2; |
d62a17ae | 2805 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 2806 | flog_err( |
e50f7cfd | 2807 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2808 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 2809 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
2810 | return bgp_attr_malformed( | |
2811 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2812 | args->total); | |
2813 | } | |
2814 | ||
2815 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2816 | ||
2817 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2818 | stream_get(&srgb_base, peer->curr, 3); |
2819 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2820 | } |
2821 | } | |
2822 | ||
e496b420 HS |
2823 | /* Placeholder code for the VPN-SID Service type */ |
2824 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
2825 | if (STREAM_READABLE(peer->curr) < length | |
2826 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
2827 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2828 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
2829 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
2830 | return bgp_attr_malformed(args, | |
2831 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2832 | args->total); | |
2833 | } | |
2834 | ||
2835 | /* Parse VPN-SID Sub-TLV */ | |
2836 | stream_getc(peer->curr); /* reserved */ | |
2837 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
2838 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2839 | stream_get(&ipv6_sid, peer->curr, | |
2840 | sizeof(ipv6_sid)); /* sid_value */ | |
2841 | ||
2842 | /* Log VPN-SID Sub-TLV */ | |
2843 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2844 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2845 | zlog_debug( | |
2846 | "%s: vpn-sid: sid %s, sid-type 0x%02x sid-flags 0x%02x", | |
2847 | __func__, buf, sid_type, sid_flags); | |
2848 | } | |
2849 | ||
2850 | /* Configure from Info */ | |
b502ca11 QY |
2851 | if (attr->srv6_vpn) { |
2852 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2853 | "Prefix SID SRv6 VPN field repeated"); | |
2854 | return bgp_attr_malformed( | |
2855 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2856 | } | |
340594a9 | 2857 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 2858 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
2859 | attr->srv6_vpn->sid_flags = sid_flags; |
2860 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
b83127e1 | 2861 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); |
e496b420 HS |
2862 | } |
2863 | ||
2864 | /* Placeholder code for the SRv6 L3 Service type */ | |
2865 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
73604f82 RS |
2866 | if (STREAM_READABLE(peer->curr) < length) { |
2867 | flog_err( | |
2868 | EC_BGP_ATTR_LEN, | |
2869 | "Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain", | |
2870 | length, STREAM_READABLE(peer->curr)); | |
e496b420 HS |
2871 | return bgp_attr_malformed(args, |
2872 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2873 | args->total); | |
2874 | } | |
2875 | ||
73604f82 RS |
2876 | /* ignore reserved */ |
2877 | stream_getc(peer->curr); | |
e496b420 | 2878 | |
73604f82 | 2879 | return bgp_attr_srv6_service(args); |
e496b420 HS |
2880 | } |
2881 | ||
2882 | /* Placeholder code for Unsupported TLV */ | |
2883 | else { | |
f69aeb76 QY |
2884 | |
2885 | if (STREAM_READABLE(peer->curr) < length) { | |
2886 | flog_err( | |
2887 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2888 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
2889 | length, STREAM_READABLE(peer->curr)); |
2890 | return bgp_attr_malformed( | |
2891 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2892 | args->total); | |
2893 | } | |
2894 | ||
c6ca155d HS |
2895 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2896 | zlog_debug( | |
2897 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
2898 | peer->host, type); | |
f69aeb76 QY |
2899 | |
2900 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
2901 | } |
2902 | ||
d62a17ae | 2903 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
2904 | } |
2905 | ||
30adbd4e DS |
2906 | /* Prefix SID attribute |
2907 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2908 | */ | |
45a06b11 | 2909 | bgp_attr_parse_ret_t bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
2910 | { |
2911 | struct peer *const peer = args->peer; | |
2912 | struct attr *const attr = args->attr; | |
2913 | bgp_attr_parse_ret_t ret; | |
2914 | ||
2915 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2916 | ||
f69aeb76 QY |
2917 | uint8_t type; |
2918 | uint16_t length; | |
2919 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 2920 | size_t psid_parsed_length = 0; |
30adbd4e | 2921 | |
38774fc5 HS |
2922 | while (STREAM_READABLE(peer->curr) > 0 |
2923 | && psid_parsed_length < args->length) { | |
30adbd4e | 2924 | |
f69aeb76 QY |
2925 | if (STREAM_READABLE(peer->curr) < headersz) { |
2926 | flog_err( | |
2927 | EC_BGP_ATTR_LEN, | |
2928 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2929 | headersz, STREAM_READABLE(peer->curr)); | |
2930 | return bgp_attr_malformed( | |
2931 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2932 | args->total); | |
2933 | } | |
30adbd4e | 2934 | |
f69aeb76 QY |
2935 | type = stream_getc(peer->curr); |
2936 | length = stream_getw(peer->curr); | |
30adbd4e | 2937 | |
f69aeb76 | 2938 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 2939 | flog_err( |
e50f7cfd | 2940 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2941 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 2942 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
2943 | return bgp_attr_malformed(args, |
2944 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2945 | args->total); | |
2946 | } | |
f69aeb76 | 2947 | |
45a06b11 | 2948 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
2949 | |
2950 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2951 | return ret; | |
38774fc5 HS |
2952 | |
2953 | psid_parsed_length += length + headersz; | |
2954 | ||
2955 | if (psid_parsed_length > args->length) { | |
2956 | flog_err( | |
2957 | EC_BGP_ATTR_LEN, | |
3efd0893 | 2958 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
2959 | length + headersz, psid_parsed_length - (length + headersz)); |
2960 | return bgp_attr_malformed( | |
2961 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2962 | args->total); | |
2963 | } | |
30adbd4e DS |
2964 | } |
2965 | ||
2966 | return BGP_ATTR_PARSE_PROCEED; | |
2967 | } | |
2968 | ||
7fd077aa | 2969 | /* PMSI tunnel attribute (RFC 6514) |
2970 | * Basic validation checks done here. | |
2971 | */ | |
2972 | static bgp_attr_parse_ret_t | |
2973 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2974 | { | |
2975 | struct peer *const peer = args->peer; | |
2976 | struct attr *const attr = args->attr; | |
2977 | const bgp_size_t length = args->length; | |
d7c0a89a | 2978 | uint8_t tnl_type; |
355f3c11 | 2979 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 2980 | |
2981 | /* Verify that the receiver is expecting "ingress replication" as we | |
2982 | * can only support that. | |
2983 | */ | |
355f3c11 | 2984 | if (length < attr_parse_len) { |
1c50c1c0 QY |
2985 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
2986 | length); | |
7fd077aa | 2987 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2988 | args->total); | |
2989 | } | |
2990 | stream_getc(peer->curr); /* Flags */ | |
2991 | tnl_type = stream_getc(peer->curr); | |
2992 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 2993 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 2994 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 2995 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2996 | args->total); | |
2997 | } | |
2998 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2999 | if (length != 9) { | |
e50f7cfd | 3000 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
3001 | "Bad PMSI tunnel attribute length %d for IR", |
3002 | length); | |
052ea98b | 3003 | return bgp_attr_malformed( |
3004 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3005 | args->total); | |
7fd077aa | 3006 | } |
3007 | } | |
3008 | ||
3009 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2a3f51cf | 3010 | bgp_attr_set_pmsi_tnl_type(attr, tnl_type); |
355f3c11 | 3011 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 3012 | |
3013 | /* Forward read pointer of input stream. */ | |
355f3c11 | 3014 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 3015 | |
3016 | return BGP_ATTR_PARSE_PROCEED; | |
3017 | } | |
3018 | ||
718e3744 | 3019 | /* BGP unknown attribute treatment. */ |
d62a17ae | 3020 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
3021 | { | |
3022 | bgp_size_t total = args->total; | |
3023 | struct transit *transit; | |
3024 | struct peer *const peer = args->peer; | |
3025 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
3026 | uint8_t *const startp = args->startp; |
3027 | const uint8_t type = args->type; | |
3028 | const uint8_t flag = args->flags; | |
d62a17ae | 3029 | const bgp_size_t length = args->length; |
3030 | ||
3031 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3032 | zlog_debug( | |
3033 | "%s Unknown attribute is received (type %d, length %d)", | |
3034 | peer->host, type, length); | |
3035 | ||
3036 | /* Forward read pointer of input stream. */ | |
424ab01d | 3037 | stream_forward_getp(peer->curr, length); |
d62a17ae | 3038 | |
3039 | /* If any of the mandatory well-known attributes are not recognized, | |
3040 | then the Error Subcode is set to Unrecognized Well-known | |
3041 | Attribute. The Data field contains the unrecognized attribute | |
3042 | (type, length and value). */ | |
3043 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
3044 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
3045 | args->total); | |
3046 | } | |
3047 | ||
3048 | /* Unrecognized non-transitive optional attributes must be quietly | |
3049 | ignored and not passed along to other BGP peers. */ | |
3050 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
3051 | return BGP_ATTR_PARSE_PROCEED; | |
3052 | ||
3053 | /* If a path with recognized transitive optional attribute is | |
3054 | accepted and passed along to other BGP peers and the Partial bit | |
3055 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
3056 | is not set back to 0 by the current AS. */ | |
3057 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
3058 | ||
3059 | /* Store transitive attribute to the end of attr->transit. */ | |
04fb21e2 DS |
3060 | transit = bgp_attr_get_transit(attr); |
3061 | if (!transit) | |
3062 | transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
d62a17ae | 3063 | |
0b04fa0e DS |
3064 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, |
3065 | transit->length + total); | |
d62a17ae | 3066 | |
3067 | memcpy(transit->val + transit->length, startp, total); | |
3068 | transit->length += total; | |
04fb21e2 | 3069 | bgp_attr_set_transit(attr, transit); |
d62a17ae | 3070 | |
3071 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 3072 | } |
3073 | ||
bb7bef14 | 3074 | /* Well-known attribute check. */ |
d62a17ae | 3075 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
3076 | { | |
d7c0a89a | 3077 | uint8_t type = 0; |
d62a17ae | 3078 | |
3079 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
3080 | * empty UPDATE. */ | |
3081 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
3082 | return BGP_ATTR_PARSE_PROCEED; | |
3083 | ||
3084 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
3085 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
3086 | are present, it should. Check for any other attribute being present | |
3087 | instead. | |
3088 | */ | |
404c82d5 PG |
3089 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
3090 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 3091 | return BGP_ATTR_PARSE_PROCEED; |
3092 | ||
3093 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
3094 | type = BGP_ATTR_ORIGIN; | |
3095 | ||
3096 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
3097 | type = BGP_ATTR_AS_PATH; | |
3098 | ||
3099 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
3100 | * and | |
3101 | * NLRI is empty. We can't easily check NLRI empty here though. | |
3102 | */ | |
3103 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3104 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
3105 | type = BGP_ATTR_NEXT_HOP; | |
3106 | ||
3107 | if (peer->sort == BGP_PEER_IBGP | |
3108 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
3109 | type = BGP_ATTR_LOCAL_PREF; | |
3110 | ||
4ba5a9c5 DA |
3111 | /* If any of the well-known mandatory attributes are not present |
3112 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
3113 | */ | |
d62a17ae | 3114 | if (type) { |
e50f7cfd | 3115 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 3116 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 3117 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 3118 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 3119 | } |
3120 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
3121 | } |
3122 | ||
718e3744 | 3123 | /* Read attribute of update packet. This function is called from |
8b366b9c | 3124 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 3125 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
3126 | bgp_size_t size, struct bgp_nlri *mp_update, | |
3127 | struct bgp_nlri *mp_withdraw) | |
3128 | { | |
f7813c7c | 3129 | bgp_attr_parse_ret_t ret; |
d7c0a89a QY |
3130 | uint8_t flag = 0; |
3131 | uint8_t type = 0; | |
d62a17ae | 3132 | bgp_size_t length; |
d7c0a89a QY |
3133 | uint8_t *startp, *endp; |
3134 | uint8_t *attr_endp; | |
3135 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 3136 | /* we need the as4_path only until we have synthesized the as_path with |
3137 | * it */ | |
3138 | /* same goes for as4_aggregator */ | |
3139 | struct aspath *as4_path = NULL; | |
3140 | as_t as4_aggregator = 0; | |
3141 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
04fb21e2 | 3142 | struct transit *transit; |
d62a17ae | 3143 | |
3144 | /* Initialize bitmap. */ | |
3145 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
3146 | ||
3147 | /* End pointer of BGP attribute. */ | |
3148 | endp = BGP_INPUT_PNT(peer) + size; | |
3149 | ||
3150 | /* Get attributes to the end of attribute length. */ | |
3151 | while (BGP_INPUT_PNT(peer) < endp) { | |
3152 | /* Check remaining length check.*/ | |
3153 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
3154 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 3155 | flog_warn( |
e50f7cfd | 3156 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3157 | "%s: error BGP attribute length %lu is smaller than min len", |
3158 | peer->host, | |
3159 | (unsigned long)(endp | |
3160 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3161 | |
3162 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3163 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3164 | ret = BGP_ATTR_PARSE_ERROR; |
3165 | goto done; | |
d62a17ae | 3166 | } |
718e3744 | 3167 | |
d62a17ae | 3168 | /* Fetch attribute flag and type. */ |
3169 | startp = BGP_INPUT_PNT(peer); | |
3170 | /* "The lower-order four bits of the Attribute Flags octet are | |
3171 | unused. They MUST be zero when sent and MUST be ignored when | |
3172 | received." */ | |
3173 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
3174 | type = stream_getc(BGP_INPUT(peer)); | |
3175 | ||
3176 | /* Check whether Extended-Length applies and is in bounds */ | |
3177 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
3178 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 3179 | flog_warn( |
e50f7cfd | 3180 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3181 | "%s: Extended length set, but just %lu bytes of attr header", |
3182 | peer->host, | |
3183 | (unsigned long)(endp | |
3184 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3185 | |
3186 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3187 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3188 | ret = BGP_ATTR_PARSE_ERROR; |
3189 | goto done; | |
d62a17ae | 3190 | } |
718e3744 | 3191 | |
d62a17ae | 3192 | /* Check extended attribue length bit. */ |
3193 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
3194 | length = stream_getw(BGP_INPUT(peer)); | |
3195 | else | |
3196 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 3197 | |
d62a17ae | 3198 | /* If any attribute appears more than once in the UPDATE |
3199 | message, then the Error Subcode is set to Malformed Attribute | |
3200 | List. */ | |
718e3744 | 3201 | |
d62a17ae | 3202 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 3203 | flog_warn( |
e50f7cfd | 3204 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
3205 | "%s: error BGP attribute type %d appears twice in a message", |
3206 | peer->host, type); | |
718e3744 | 3207 | |
d62a17ae | 3208 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
3209 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3210 | ret = BGP_ATTR_PARSE_ERROR; |
3211 | goto done; | |
d62a17ae | 3212 | } |
3213 | ||
3214 | /* Set type to bitmap to check duplicate attribute. `type' is | |
3215 | unsigned char so it never overflow bitmap range. */ | |
3216 | ||
3217 | SET_BITMAP(seen, type); | |
3218 | ||
3219 | /* Overflow check. */ | |
3220 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3221 | ||
3222 | if (attr_endp > endp) { | |
ade6974d | 3223 | flog_warn( |
e50f7cfd | 3224 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3225 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3226 | peer->host, type, length, size, attr_endp, | |
3227 | endp); | |
dacffad4 QY |
3228 | /* |
3229 | * RFC 4271 6.3 | |
3230 | * If any recognized attribute has an Attribute | |
3231 | * Length that conflicts with the expected length | |
3232 | * (based on the attribute type code), then the | |
3233 | * Error Subcode MUST be set to Attribute Length | |
3234 | * Error. The Data field MUST contain the erroneous | |
3235 | * attribute (type, length, and value). | |
3236 | * ---------- | |
3237 | * We do not currently have a good way to determine the | |
3238 | * length of the attribute independent of the length | |
3239 | * received in the message. Instead we send the | |
3240 | * minimum between the amount of data we have and the | |
3241 | * amount specified by the attribute length field. | |
3242 | * | |
3243 | * Instead of directly passing in the packet buffer and | |
3244 | * offset we use the stream_get* functions to read into | |
3245 | * a stack buffer, since they perform bounds checking | |
3246 | * and we are working with untrusted data. | |
3247 | */ | |
ef56aee4 | 3248 | unsigned char ndata[peer->max_packet_size]; |
dacffad4 QY |
3249 | memset(ndata, 0x00, sizeof(ndata)); |
3250 | size_t lfl = | |
3251 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3252 | /* Rewind to end of flag field */ | |
763a5d3c | 3253 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3254 | /* Type */ |
3255 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3256 | /* Length */ | |
3257 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3258 | /* Value */ | |
3259 | size_t atl = attr_endp - startp; | |
3260 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3261 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3262 | ||
d62a17ae | 3263 | bgp_notify_send_with_data( |
3264 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3265 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3266 | ndl + lfl + 1); | |
3267 | ||
b6a171c7 QY |
3268 | ret = BGP_ATTR_PARSE_ERROR; |
3269 | goto done; | |
d62a17ae | 3270 | } |
3271 | ||
3272 | struct bgp_attr_parser_args attr_args = { | |
3273 | .peer = peer, | |
3274 | .length = length, | |
3275 | .attr = attr, | |
3276 | .type = type, | |
3277 | .flags = flag, | |
3278 | .startp = startp, | |
3279 | .total = attr_endp - startp, | |
3280 | }; | |
3281 | ||
3282 | ||
3283 | /* If any recognized attribute has Attribute Flags that conflict | |
3284 | with the Attribute Type Code, then the Error Subcode is set | |
3285 | to | |
3286 | Attribute Flags Error. The Data field contains the erroneous | |
3287 | attribute (type, length and value). */ | |
3288 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3289 | ret = bgp_attr_malformed( |
3290 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3291 | attr_args.total); | |
3292 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3293 | continue; | |
b6a171c7 | 3294 | goto done; |
d62a17ae | 3295 | } |
3296 | ||
3297 | /* OK check attribute and store it's value. */ | |
3298 | switch (type) { | |
3299 | case BGP_ATTR_ORIGIN: | |
3300 | ret = bgp_attr_origin(&attr_args); | |
3301 | break; | |
3302 | case BGP_ATTR_AS_PATH: | |
3303 | ret = bgp_attr_aspath(&attr_args); | |
3304 | break; | |
3305 | case BGP_ATTR_AS4_PATH: | |
3306 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3307 | break; | |
3308 | case BGP_ATTR_NEXT_HOP: | |
3309 | ret = bgp_attr_nexthop(&attr_args); | |
3310 | break; | |
3311 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3312 | ret = bgp_attr_med(&attr_args); | |
3313 | break; | |
3314 | case BGP_ATTR_LOCAL_PREF: | |
3315 | ret = bgp_attr_local_pref(&attr_args); | |
3316 | break; | |
3317 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3318 | ret = bgp_attr_atomic(&attr_args); | |
3319 | break; | |
3320 | case BGP_ATTR_AGGREGATOR: | |
3321 | ret = bgp_attr_aggregator(&attr_args); | |
3322 | break; | |
3323 | case BGP_ATTR_AS4_AGGREGATOR: | |
3324 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3325 | &as4_aggregator, | |
3326 | &as4_aggregator_addr); | |
3327 | break; | |
3328 | case BGP_ATTR_COMMUNITIES: | |
3329 | ret = bgp_attr_community(&attr_args); | |
3330 | break; | |
3331 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3332 | ret = bgp_attr_large_community(&attr_args); | |
3333 | break; | |
3334 | case BGP_ATTR_ORIGINATOR_ID: | |
3335 | ret = bgp_attr_originator_id(&attr_args); | |
3336 | break; | |
3337 | case BGP_ATTR_CLUSTER_LIST: | |
3338 | ret = bgp_attr_cluster_list(&attr_args); | |
3339 | break; | |
3340 | case BGP_ATTR_MP_REACH_NLRI: | |
3341 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3342 | break; | |
3343 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3344 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3345 | break; | |
3346 | case BGP_ATTR_EXT_COMMUNITIES: | |
3347 | ret = bgp_attr_ext_communities(&attr_args); | |
3348 | break; | |
1e20238a | 3349 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3350 | case BGP_ATTR_VNC: |
65efcfce | 3351 | #endif |
d62a17ae | 3352 | case BGP_ATTR_ENCAP: |
3353 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3354 | startp); | |
3355 | break; | |
3356 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3357 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3358 | break; |
7fd077aa | 3359 | case BGP_ATTR_PMSI_TUNNEL: |
3360 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3361 | break; | |
9a659715 PG |
3362 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3363 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3364 | break; | |
d62a17ae | 3365 | default: |
3366 | ret = bgp_attr_unknown(&attr_args); | |
3367 | break; | |
3368 | } | |
3369 | ||
3370 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3371 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3372 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3373 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3374 | goto done; |
d62a17ae | 3375 | } |
3376 | ||
9b9df989 | 3377 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3378 | goto done; |
9b9df989 DS |
3379 | } |
3380 | ||
d62a17ae | 3381 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3382 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3383 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3384 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3385 | goto done; |
d62a17ae | 3386 | } |
3387 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3388 | flog_warn( |
e50f7cfd | 3389 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3390 | "%s: Attribute %s, parse error - treating as withdrawal", |
3391 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3392 | goto done; |
d62a17ae | 3393 | } |
3394 | ||
3395 | /* Check the fetched length. */ | |
3396 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3397 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3398 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3399 | peer->host, lookup_msg(attr_str, type, NULL)); |
3400 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3401 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3402 | ret = BGP_ATTR_PARSE_ERROR; |
3403 | goto done; | |
d62a17ae | 3404 | } |
718e3744 | 3405 | } |
d62a17ae | 3406 | |
e5d4cda0 HS |
3407 | /* |
3408 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3409 | * About Prefix-SID path attribute, | |
3410 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3411 | * may only appear in a BGP Prefix-SID attribute attached to | |
3412 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3413 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3414 | */ | |
3415 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3416 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3417 | ||
d62a17ae | 3418 | /* Check final read pointer is same as end pointer. */ |
3419 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3420 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3421 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3422 | lookup_msg(attr_str, type, NULL)); |
3423 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3424 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3425 | |
3426 | ret = BGP_ATTR_PARSE_ERROR; | |
3427 | goto done; | |
d62a17ae | 3428 | } |
3429 | ||
88f33d66 | 3430 | /* |
3431 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3432 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3433 | * This is implemented below and will result in a NOTIFICATION. If the | |
3434 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3435 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3436 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3437 | * | |
3438 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3439 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3440 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3441 | * speaker that receives the message SHOULD ignore this attribute. | |
3442 | */ | |
3443 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3444 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3445 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3446 | ret = BGP_ATTR_PARSE_ERROR; |
3447 | goto done; | |
88f33d66 | 3448 | } |
3449 | } | |
3450 | ||
d62a17ae | 3451 | /* Check all mandatory well-known attributes are present */ |
11dbcdd3 DA |
3452 | ret = bgp_attr_check(peer, attr); |
3453 | if (ret < 0) | |
b6a171c7 | 3454 | goto done; |
d62a17ae | 3455 | |
3456 | /* | |
3457 | * At this place we can see whether we got AS4_PATH and/or | |
3458 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3459 | * We can not do this before we've read all attributes because | |
3460 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3461 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3462 | * in relationship to AGGREGATOR. | |
3463 | * So, to be defensive, we are not relying on any order and read | |
3464 | * all attributes first, including these 32bit ones, and now, | |
3465 | * afterwards, we look what and if something is to be done for as4. | |
3466 | * | |
3467 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3468 | * MP_UNREACH_NLRI. | |
3469 | */ | |
3470 | /* actually... this doesn't ever return failure currently, but | |
3471 | * better safe than sorry */ | |
3472 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3473 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3474 | &as4_aggregator_addr)) { | |
3475 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3476 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3477 | ret = BGP_ATTR_PARSE_ERROR; |
3478 | goto done; | |
d62a17ae | 3479 | } |
3480 | ||
d62a17ae | 3481 | /* |
3482 | * Finally do the checks on the aspath we did not do yet | |
3483 | * because we waited for a potentially synthesized aspath. | |
3484 | */ | |
3485 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3486 | ret = bgp_attr_aspath_check(peer, attr); | |
3487 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3488 | goto done; |
d62a17ae | 3489 | } |
718e3744 | 3490 | |
b6a171c7 | 3491 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3492 | done: |
5e0e9c09 | 3493 | |
b6a171c7 QY |
3494 | /* |
3495 | * At this stage, we have done all fiddling with as4, and the | |
3496 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3497 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3498 | * to save memory | |
3499 | */ | |
3500 | if (as4_path) { | |
3501 | /* | |
3502 | * unintern - it is in the hash | |
3503 | * The flag that we got this is still there, but that | |
3504 | * does not do any trouble | |
3505 | */ | |
3506 | aspath_unintern(&as4_path); | |
3507 | } | |
3508 | ||
04fb21e2 | 3509 | transit = bgp_attr_get_transit(attr); |
b6a171c7 QY |
3510 | if (ret != BGP_ATTR_PARSE_ERROR) { |
3511 | /* Finally intern unknown attribute. */ | |
04fb21e2 DS |
3512 | if (transit) |
3513 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
b6a171c7 QY |
3514 | if (attr->encap_subtlvs) |
3515 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3516 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3517 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3518 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3519 | bgp_attr_get_vnc_subtlvs(attr); | |
3520 | ||
3521 | if (vnc_subtlvs) | |
3522 | bgp_attr_set_vnc_subtlvs( | |
3523 | attr, | |
3524 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
5e0e9c09 QY |
3525 | #endif |
3526 | } else { | |
04fb21e2 DS |
3527 | if (transit) { |
3528 | transit_free(transit); | |
3529 | bgp_attr_set_transit(attr, NULL); | |
5e0e9c09 QY |
3530 | } |
3531 | ||
3532 | bgp_attr_flush_encap(attr); | |
3533 | }; | |
3534 | ||
3535 | /* Sanity checks */ | |
04fb21e2 DS |
3536 | transit = bgp_attr_get_transit(attr); |
3537 | if (transit) | |
3538 | assert(transit->refcnt > 0); | |
d62a17ae | 3539 | if (attr->encap_subtlvs) |
5e0e9c09 | 3540 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3541 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3542 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3543 | bgp_attr_get_vnc_subtlvs(attr); | |
3544 | ||
3545 | if (vnc_subtlvs) | |
3546 | assert(vnc_subtlvs->refcnt > 0); | |
bede7744 | 3547 | #endif |
718e3744 | 3548 | |
b6a171c7 | 3549 | return ret; |
d62a17ae | 3550 | } |
3551 | ||
f4bd90c5 LK |
3552 | /* |
3553 | * Extract the tunnel type from extended community | |
3554 | */ | |
3555 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3556 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3557 | { |
3558 | struct ecommunity *ecom; | |
f6e07e1b DS |
3559 | uint32_t i; |
3560 | ||
f4bd90c5 | 3561 | if (!attr) |
fa346686 | 3562 | return; |
f4bd90c5 | 3563 | |
b53e67a3 | 3564 | ecom = bgp_attr_get_ecommunity(attr); |
f4bd90c5 | 3565 | if (!ecom || !ecom->size) |
fa346686 | 3566 | return; |
f4bd90c5 LK |
3567 | |
3568 | for (i = 0; i < ecom->size; i++) { | |
3569 | uint8_t *pnt; | |
3570 | uint8_t type, sub_type; | |
3571 | ||
3572 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3573 | type = pnt[0]; | |
3574 | sub_type = pnt[1]; | |
3575 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3576 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3577 | continue; | |
3578 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3579 | return; |
f4bd90c5 LK |
3580 | } |
3581 | ||
fa346686 | 3582 | return; |
f4bd90c5 LK |
3583 | } |
3584 | ||
d62a17ae | 3585 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3586 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3587 | struct attr *attr) | |
3588 | { | |
3589 | size_t sizep; | |
3590 | iana_afi_t pkt_afi; | |
5c525538 | 3591 | iana_safi_t pkt_safi; |
d62a17ae | 3592 | afi_t nh_afi; |
3593 | ||
3594 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3595 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3596 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3597 | sizep = stream_get_endp(s); | |
3598 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3599 | ||
3600 | ||
3601 | /* Convert AFI, SAFI to values for packet. */ | |
3602 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3603 | ||
3604 | stream_putw(s, pkt_afi); /* AFI */ | |
3605 | stream_putc(s, pkt_safi); /* SAFI */ | |
3606 | ||
3607 | /* Nexthop AFI */ | |
ce78a6fb | 3608 | if (afi == AFI_IP |
e496b420 HS |
3609 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3610 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3611 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3612 | else if (safi == SAFI_FLOWSPEC) |
3613 | nh_afi = afi; | |
d62a17ae | 3614 | else |
3615 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3616 | ||
3617 | /* Nexthop */ | |
3618 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3619 | switch (nh_afi) { | |
3620 | case AFI_IP: | |
3621 | switch (safi) { | |
3622 | case SAFI_UNICAST: | |
3623 | case SAFI_MULTICAST: | |
3624 | case SAFI_LABELED_UNICAST: | |
3625 | stream_putc(s, 4); | |
3626 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3627 | break; | |
3628 | case SAFI_MPLS_VPN: | |
3629 | stream_putc(s, 12); | |
3630 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3631 | stream_putl(s, 0); | |
3632 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3633 | break; | |
3634 | case SAFI_ENCAP: | |
3635 | case SAFI_EVPN: | |
3636 | stream_putc(s, 4); | |
3637 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3638 | break; | |
7c40bf39 | 3639 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3640 | if (attr->mp_nexthop_len == 0) |
3641 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3642 | else { | |
3643 | stream_putc(s, attr->mp_nexthop_len); | |
3644 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3645 | } | |
d62a17ae | 3646 | default: |
3647 | break; | |
3648 | } | |
3649 | break; | |
3650 | case AFI_IP6: | |
3651 | switch (safi) { | |
3652 | case SAFI_UNICAST: | |
3653 | case SAFI_MULTICAST: | |
3654 | case SAFI_LABELED_UNICAST: | |
3655 | case SAFI_EVPN: { | |
3656 | if (attr->mp_nexthop_len | |
3657 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3658 | stream_putc(s, | |
3659 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
3660 | stream_put(s, &attr->mp_nexthop_global, | |
3661 | IPV6_MAX_BYTELEN); | |
3662 | stream_put(s, &attr->mp_nexthop_local, | |
3663 | IPV6_MAX_BYTELEN); | |
3664 | } else { | |
3665 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3666 | stream_put(s, &attr->mp_nexthop_global, | |
3667 | IPV6_MAX_BYTELEN); | |
3668 | } | |
3669 | } break; | |
3670 | case SAFI_MPLS_VPN: { | |
3671 | if (attr->mp_nexthop_len | |
3672 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
3673 | stream_putc(s, 24); | |
3674 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3675 | stream_putl(s, 0); | |
3676 | stream_put(s, &attr->mp_nexthop_global, | |
3677 | IPV6_MAX_BYTELEN); | |
3678 | } else if (attr->mp_nexthop_len | |
3679 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3680 | stream_putc(s, 48); | |
3681 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3682 | stream_putl(s, 0); | |
3683 | stream_put(s, &attr->mp_nexthop_global, | |
3684 | IPV6_MAX_BYTELEN); | |
3685 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3686 | stream_putl(s, 0); | |
3687 | stream_put(s, &attr->mp_nexthop_local, | |
3688 | IPV6_MAX_BYTELEN); | |
3689 | } | |
3690 | } break; | |
3691 | case SAFI_ENCAP: | |
3692 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3693 | stream_put(s, &attr->mp_nexthop_global, | |
3694 | IPV6_MAX_BYTELEN); | |
3695 | break; | |
7c40bf39 | 3696 | case SAFI_FLOWSPEC: |
3697 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 3698 | default: |
3699 | break; | |
3700 | } | |
3701 | break; | |
8c71e481 | 3702 | default: |
a83da8e1 | 3703 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 3704 | flog_err( |
e50f7cfd | 3705 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
3706 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
3707 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 3708 | break; |
3709 | } | |
3710 | ||
3711 | /* SNPA */ | |
3712 | stream_putc(s, 0); | |
3713 | return sizep; | |
3714 | } | |
3715 | ||
3716 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
3717 | const struct prefix *p, |
3718 | const struct prefix_rd *prd, mpls_label_t *label, | |
be92fc9f | 3719 | uint32_t num_labels, bool addpath_capable, |
5f040085 | 3720 | uint32_t addpath_tx_id, struct attr *attr) |
d62a17ae | 3721 | { |
3722 | if (safi == SAFI_MPLS_VPN) { | |
be92fc9f | 3723 | if (addpath_capable) |
d62a17ae | 3724 | stream_putl(s, addpath_tx_id); |
3725 | /* Label, RD, Prefix write. */ | |
3726 | stream_putc(s, p->prefixlen + 88); | |
3727 | stream_put(s, label, BGP_LABEL_BYTES); | |
3728 | stream_put(s, prd->val, 8); | |
3729 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
3730 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
3731 | /* EVPN prefix - contents depend on type */ | |
996c9314 | 3732 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
be92fc9f | 3733 | addpath_capable, addpath_tx_id); |
d62a17ae | 3734 | } else if (safi == SAFI_LABELED_UNICAST) { |
3735 | /* Prefix write with label. */ | |
be92fc9f | 3736 | stream_put_labeled_prefix(s, p, label, addpath_capable, |
ec15e1b5 | 3737 | addpath_tx_id); |
7c40bf39 | 3738 | } else if (safi == SAFI_FLOWSPEC) { |
f1af8f04 PG |
3739 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
3740 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
3741 | p->u.prefix_flowspec.prefixlen); | |
d62a17ae | 3742 | } else |
be92fc9f | 3743 | stream_put_prefix_addpath(s, p, addpath_capable, addpath_tx_id); |
d62a17ae | 3744 | } |
3745 | ||
5f040085 DS |
3746 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
3747 | const struct prefix *p) | |
d62a17ae | 3748 | { |
3749 | int size = PSIZE(p->prefixlen); | |
3750 | if (safi == SAFI_MPLS_VPN) | |
3751 | size += 88; | |
4195afbf EDP |
3752 | else if (safi == SAFI_LABELED_UNICAST) |
3753 | size += BGP_LABEL_BYTES; | |
d62a17ae | 3754 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
3755 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
3756 | // type-5 | |
3757 | return size; | |
8c71e481 PM |
3758 | } |
3759 | ||
f4c89855 | 3760 | /* |
65efcfce | 3761 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 3762 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 3763 | * almost the same TLV format |
f4c89855 | 3764 | */ |
d62a17ae | 3765 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
3766 | struct stream *s, struct attr *attr, | |
3767 | uint8_t attrtype) | |
3768 | { | |
3769 | unsigned int attrlenfield = 0; | |
3770 | unsigned int attrhdrlen = 0; | |
3771 | struct bgp_attr_encap_subtlv *subtlvs; | |
3772 | struct bgp_attr_encap_subtlv *st; | |
3773 | const char *attrname; | |
3774 | ||
9d303b37 DL |
3775 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
3776 | && (!attr->encap_tunneltype | |
3777 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 3778 | return; |
3779 | ||
3780 | switch (attrtype) { | |
f4c89855 | 3781 | case BGP_ATTR_ENCAP: |
d62a17ae | 3782 | attrname = "Tunnel Encap"; |
3783 | subtlvs = attr->encap_subtlvs; | |
3784 | if (subtlvs == NULL) /* nothing to do */ | |
3785 | return; | |
3786 | /* | |
3787 | * The tunnel encap attr has an "outer" tlv. | |
3788 | * T = tunneltype, | |
3789 | * L = total length of subtlvs, | |
3790 | * V = concatenated subtlvs. | |
3791 | */ | |
3792 | attrlenfield = 2 + 2; /* T + L */ | |
3793 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
3794 | break; | |
f4c89855 | 3795 | |
1e20238a | 3796 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 3797 | case BGP_ATTR_VNC: |
d62a17ae | 3798 | attrname = "VNC"; |
91ebf12c | 3799 | subtlvs = bgp_attr_get_vnc_subtlvs(attr); |
d62a17ae | 3800 | if (subtlvs == NULL) /* nothing to do */ |
3801 | return; | |
3802 | attrlenfield = 0; /* no outer T + L */ | |
3803 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
3804 | break; | |
65efcfce LB |
3805 | #endif |
3806 | ||
f4c89855 | 3807 | default: |
d62a17ae | 3808 | assert(0); |
3809 | } | |
3810 | ||
3811 | /* compute attr length */ | |
3812 | for (st = subtlvs; st; st = st->next) { | |
3813 | attrlenfield += (attrhdrlen + st->length); | |
3814 | } | |
3815 | ||
3816 | if (attrlenfield > 0xffff) { | |
3817 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
3818 | attrname, attrlenfield); | |
3819 | return; | |
3820 | } | |
3821 | ||
3822 | if (attrlenfield > 0xff) { | |
3823 | /* 2-octet length field */ | |
996c9314 LB |
3824 | stream_putc(s, |
3825 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3826 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3827 | stream_putc(s, attrtype); |
3828 | stream_putw(s, attrlenfield & 0xffff); | |
3829 | } else { | |
3830 | /* 1-octet length field */ | |
3831 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
3832 | stream_putc(s, attrtype); | |
3833 | stream_putc(s, attrlenfield & 0xff); | |
3834 | } | |
3835 | ||
3836 | if (attrtype == BGP_ATTR_ENCAP) { | |
3837 | /* write outer T+L */ | |
3838 | stream_putw(s, attr->encap_tunneltype); | |
3839 | stream_putw(s, attrlenfield - 4); | |
3840 | } | |
3841 | ||
3842 | /* write each sub-tlv */ | |
3843 | for (st = subtlvs; st; st = st->next) { | |
3844 | if (attrtype == BGP_ATTR_ENCAP) { | |
3845 | stream_putc(s, st->type); | |
3846 | stream_putc(s, st->length); | |
1e20238a | 3847 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 3848 | } else { |
3849 | stream_putw(s, st->type); | |
3850 | stream_putw(s, st->length); | |
65efcfce | 3851 | #endif |
d62a17ae | 3852 | } |
3853 | stream_put(s, st->value, st->length); | |
3854 | } | |
f4c89855 | 3855 | } |
f4c89855 | 3856 | |
d62a17ae | 3857 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 3858 | { |
d62a17ae | 3859 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
3860 | the attr length */ | |
3861 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
3862 | } |
3863 | ||
3dc339cd | 3864 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
3865 | { |
3866 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
3867 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
3868 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3869 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
3870 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3871 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
3872 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3873 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
3874 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3875 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
3876 | return true; |
3877 | return false; | |
6b5a72a3 DA |
3878 | } |
3879 | ||
718e3744 | 3880 | /* Make attribute packet. */ |
d62a17ae | 3881 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
3882 | struct stream *s, struct attr *attr, | |
3883 | struct bpacket_attr_vec_arr *vecarr, | |
3884 | struct prefix *p, afi_t afi, safi_t safi, | |
3885 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a | 3886 | mpls_label_t *label, uint32_t num_labels, |
be92fc9f | 3887 | bool addpath_capable, uint32_t addpath_tx_id) |
d62a17ae | 3888 | { |
3889 | size_t cp; | |
3890 | size_t aspath_sizep; | |
3891 | struct aspath *aspath; | |
3892 | int send_as4_path = 0; | |
3893 | int send_as4_aggregator = 0; | |
8cff42ad DA |
3894 | bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
3895 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV); | |
d62a17ae | 3896 | |
3897 | if (!bgp) | |
3898 | bgp = peer->bgp; | |
3899 | ||
3900 | /* Remember current pointer. */ | |
3901 | cp = stream_get_endp(s); | |
3902 | ||
3903 | if (p | |
3904 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3905 | && !peer_cap_enhe(peer, afi, safi))) { | |
3906 | size_t mpattrlen_pos = 0; | |
3907 | ||
3908 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3909 | vecarr, attr); | |
996c9314 | 3910 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
be92fc9f | 3911 | num_labels, addpath_capable, |
996c9314 | 3912 | addpath_tx_id, attr); |
d62a17ae | 3913 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3914 | } |
d62a17ae | 3915 | |
3916 | /* Origin attribute. */ | |
3917 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3918 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3919 | stream_putc(s, 1); | |
3920 | stream_putc(s, attr->origin); | |
3921 | ||
3922 | /* AS path attribute. */ | |
3923 | ||
3924 | /* If remote-peer is EBGP */ | |
3925 | if (peer->sort == BGP_PEER_EBGP | |
3926 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3927 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3928 | || attr->aspath->segments == NULL) | |
3929 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3930 | PEER_FLAG_RSERVER_CLIENT))) { | |
3931 | aspath = aspath_dup(attr->aspath); | |
3932 | ||
3933 | /* Even though we may not be configured for confederations we | |
3934 | * may have | |
3935 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3936 | aspath = aspath_delete_confed_seq(aspath); | |
3937 | ||
3938 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3939 | /* Stuff our path CONFED_ID on the front */ | |
3940 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3941 | } else { | |
3942 | if (peer->change_local_as) { | |
3943 | /* If replace-as is specified, we only use the | |
3944 | change_local_as when | |
3945 | advertising routes. */ | |
6b5a72a3 DA |
3946 | if (!CHECK_FLAG(peer->flags, |
3947 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
3948 | if (bgp_append_local_as(peer, afi, | |
3949 | safi)) | |
3950 | aspath = aspath_add_seq( | |
3951 | aspath, peer->local_as); | |
d62a17ae | 3952 | aspath = aspath_add_seq(aspath, |
3953 | peer->change_local_as); | |
3954 | } else { | |
3955 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3956 | } | |
3957 | } | |
3958 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3959 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3960 | * thing */ | |
3961 | aspath = aspath_dup(attr->aspath); | |
3962 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3963 | } else | |
3964 | aspath = attr->aspath; | |
3965 | ||
3966 | /* If peer is not AS4 capable, then: | |
3967 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3968 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3969 | * segment | |
3970 | * types are in it (i.e. exclude them if they are there) | |
3971 | * AND do this only if there is at least one asnum > 65535 in the | |
3972 | * path! | |
3973 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3974 | * change | |
3975 | * all ASnums > 65535 to BGP_AS_TRANS | |
3976 | */ | |
3977 | ||
3978 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3979 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3980 | aspath_sizep = stream_get_endp(s); | |
3981 | stream_putw(s, 0); | |
3982 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3983 | ||
3984 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3985 | * in the path | |
3986 | */ | |
3987 | if (!use32bit && aspath_has_as4(aspath)) | |
3988 | send_as4_path = | |
3989 | 1; /* we'll do this later, at the correct place */ | |
3990 | ||
3991 | /* Nexthop attribute. */ | |
3992 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3993 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
3994 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
3995 | ||
d62a17ae | 3996 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
3997 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3998 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3999 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4000 | attr); | |
4001 | stream_putc(s, 4); | |
4002 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
4003 | } else if (peer_cap_enhe(from, afi, safi) |
4004 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 4005 | /* |
4006 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
4007 | * received with Extended Next-hop capability in this |
4008 | * or another vrf and is now being advertised to | |
4009 | * non-ENHE peers. Since peer_cap_enhe only checks | |
4010 | * peers in this vrf, also check the nh_afi to catch | |
4011 | * the case where the originator was in another vrf. | |
d62a17ae | 4012 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
4013 | * to enable implicit next-hop self with correct A-F |
4014 | * (ipv4 address family). | |
d62a17ae | 4015 | */ |
4016 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4017 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4018 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4019 | NULL); | |
4020 | stream_putc(s, 4); | |
4021 | stream_put_ipv4(s, 0); | |
4022 | } | |
718e3744 | 4023 | } |
d62a17ae | 4024 | |
4025 | /* MED attribute. */ | |
4026 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
4027 | || bgp->maxmed_active) { | |
4028 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4029 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4030 | stream_putc(s, 4); | |
4031 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
4032 | : attr->med)); | |
4033 | } | |
4034 | ||
4035 | /* Local preference. */ | |
4036 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
4037 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4038 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4039 | stream_putc(s, 4); | |
4040 | stream_putl(s, attr->local_pref); | |
4041 | } | |
4042 | ||
4043 | /* Atomic aggregate. */ | |
4044 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4045 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4046 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4047 | stream_putc(s, 0); | |
4048 | } | |
4049 | ||
4050 | /* Aggregator. */ | |
4051 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4052 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
4053 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4054 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4055 | ||
4056 | if (use32bit) { | |
4057 | /* AS4 capable peer */ | |
4058 | stream_putc(s, 8); | |
4059 | stream_putl(s, attr->aggregator_as); | |
4060 | } else { | |
4061 | /* 2-byte AS peer */ | |
4062 | stream_putc(s, 6); | |
4063 | ||
4064 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
4065 | * used? */ | |
48e1932b | 4066 | if (attr->aggregator_as > UINT16_MAX) { |
d62a17ae | 4067 | stream_putw(s, BGP_AS_TRANS); |
4068 | ||
4069 | /* we have to send AS4_AGGREGATOR, too. | |
4070 | * we'll do that later in order to send | |
4071 | * attributes in ascending | |
4072 | * order. | |
4073 | */ | |
4074 | send_as4_aggregator = 1; | |
4075 | } else | |
d7c0a89a | 4076 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 4077 | } |
4078 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4079 | } | |
4080 | ||
4081 | /* Community attribute. */ | |
4082 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
4083 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
4084 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4085 | stream_putc(s, |
4086 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4087 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4088 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4089 | stream_putw(s, attr->community->size * 4); | |
4090 | } else { | |
996c9314 LB |
4091 | stream_putc(s, |
4092 | BGP_ATTR_FLAG_OPTIONAL | |
4093 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4094 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4095 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 4096 | } |
d62a17ae | 4097 | stream_put(s, attr->community->val, attr->community->size * 4); |
4098 | } | |
4099 | ||
4100 | /* | |
4101 | * Large Community attribute. | |
4102 | */ | |
4103 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
4104 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
4105 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 4106 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4107 | stream_putc(s, |
4108 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4109 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4110 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4111 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4112 | } else { |
996c9314 LB |
4113 | stream_putc(s, |
4114 | BGP_ATTR_FLAG_OPTIONAL | |
4115 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4116 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4117 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 4118 | } |
d62a17ae | 4119 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 4120 | lcom_length(attr->lcommunity)); |
d62a17ae | 4121 | } |
4372df71 | 4122 | |
d62a17ae | 4123 | /* Route Reflector. */ |
4124 | if (peer->sort == BGP_PEER_IBGP && from | |
4125 | && from->sort == BGP_PEER_IBGP) { | |
779fee93 DS |
4126 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); |
4127 | ||
d62a17ae | 4128 | /* Originator ID. */ |
4129 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4130 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
4131 | stream_putc(s, 4); | |
4132 | ||
4133 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
4134 | stream_put_in_addr(s, &attr->originator_id); | |
4135 | else | |
4136 | stream_put_in_addr(s, &from->remote_id); | |
4137 | ||
4138 | /* Cluster list. */ | |
4139 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4140 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
4141 | ||
779fee93 DS |
4142 | if (cluster) { |
4143 | stream_putc(s, cluster->length + 4); | |
d62a17ae | 4144 | /* If this peer configuration's parent BGP has |
4145 | * cluster_id. */ | |
4146 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4147 | stream_put_in_addr(s, &bgp->cluster_id); | |
4148 | else | |
4149 | stream_put_in_addr(s, &bgp->router_id); | |
779fee93 | 4150 | stream_put(s, cluster->list, cluster->length); |
d62a17ae | 4151 | } else { |
4152 | stream_putc(s, 4); | |
4153 | /* If this peer configuration's parent BGP has | |
4154 | * cluster_id. */ | |
4155 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4156 | stream_put_in_addr(s, &bgp->cluster_id); | |
4157 | else | |
4158 | stream_put_in_addr(s, &bgp->router_id); | |
4159 | } | |
4160 | } | |
4372df71 | 4161 | |
d62a17ae | 4162 | /* Extended Communities attribute. */ |
4163 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
4164 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
b53e67a3 DA |
4165 | struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr); |
4166 | ||
d62a17ae | 4167 | if (peer->sort == BGP_PEER_IBGP |
4168 | || peer->sort == BGP_PEER_CONFED) { | |
b53e67a3 | 4169 | if (ecomm->size * 8 > 255) { |
996c9314 LB |
4170 | stream_putc(s, |
4171 | BGP_ATTR_FLAG_OPTIONAL | |
4172 | | BGP_ATTR_FLAG_TRANS | |
4173 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4174 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4175 | stream_putw(s, ecomm->size * 8); |
d62a17ae | 4176 | } else { |
996c9314 LB |
4177 | stream_putc(s, |
4178 | BGP_ATTR_FLAG_OPTIONAL | |
4179 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4180 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4181 | stream_putc(s, ecomm->size * 8); |
d62a17ae | 4182 | } |
b53e67a3 | 4183 | stream_put(s, ecomm->val, ecomm->size * 8); |
d62a17ae | 4184 | } else { |
d7c0a89a | 4185 | uint8_t *pnt; |
d62a17ae | 4186 | int tbit; |
4187 | int ecom_tr_size = 0; | |
f6e07e1b | 4188 | uint32_t i; |
d62a17ae | 4189 | |
b53e67a3 DA |
4190 | for (i = 0; i < ecomm->size; i++) { |
4191 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4192 | tbit = *pnt; |
4193 | ||
4194 | if (CHECK_FLAG(tbit, | |
4195 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4196 | continue; | |
4197 | ||
4198 | ecom_tr_size++; | |
4199 | } | |
4200 | ||
4201 | if (ecom_tr_size) { | |
4202 | if (ecom_tr_size * 8 > 255) { | |
4203 | stream_putc( | |
4204 | s, | |
4205 | BGP_ATTR_FLAG_OPTIONAL | |
4206 | | BGP_ATTR_FLAG_TRANS | |
4207 | | BGP_ATTR_FLAG_EXTLEN); | |
4208 | stream_putc(s, | |
4209 | BGP_ATTR_EXT_COMMUNITIES); | |
4210 | stream_putw(s, ecom_tr_size * 8); | |
4211 | } else { | |
4212 | stream_putc( | |
4213 | s, | |
4214 | BGP_ATTR_FLAG_OPTIONAL | |
4215 | | BGP_ATTR_FLAG_TRANS); | |
4216 | stream_putc(s, | |
4217 | BGP_ATTR_EXT_COMMUNITIES); | |
4218 | stream_putc(s, ecom_tr_size * 8); | |
4219 | } | |
4220 | ||
b53e67a3 DA |
4221 | for (i = 0; i < ecomm->size; i++) { |
4222 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4223 | tbit = *pnt; |
4224 | ||
4225 | if (CHECK_FLAG( | |
4226 | tbit, | |
4227 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4228 | continue; | |
4229 | ||
4230 | stream_put(s, pnt, 8); | |
4231 | } | |
4232 | } | |
4233 | } | |
4234 | } | |
4372df71 | 4235 | |
d62a17ae | 4236 | /* Label index attribute. */ |
4237 | if (safi == SAFI_LABELED_UNICAST) { | |
4238 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4239 | uint32_t label_index; |
d62a17ae | 4240 | |
4241 | label_index = attr->label_index; | |
4242 | ||
4243 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4244 | stream_putc(s, |
4245 | BGP_ATTR_FLAG_OPTIONAL | |
4246 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4247 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4248 | stream_putc(s, 10); | |
4249 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4250 | stream_putw(s, | |
4251 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4252 | stream_putc(s, 0); // reserved | |
4253 | stream_putw(s, 0); // flags | |
4254 | stream_putl(s, label_index); | |
4255 | } | |
4372df71 | 4256 | } |
d62a17ae | 4257 | } |
4258 | ||
e496b420 | 4259 | /* SRv6 Service Information Attribute. */ |
dbcf19b8 | 4260 | if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) { |
e496b420 | 4261 | if (attr->srv6_l3vpn) { |
a3e3b5b0 | 4262 | uint8_t subtlv_len = |
a1a51008 RS |
4263 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH |
4264 | + BGP_ATTR_MIN_LEN | |
4265 | + BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH; | |
4266 | uint8_t tlv_len = subtlv_len + BGP_ATTR_MIN_LEN + 1; | |
4267 | uint8_t attr_len = tlv_len + BGP_ATTR_MIN_LEN; | |
e496b420 HS |
4268 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
4269 | | BGP_ATTR_FLAG_TRANS); | |
4270 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
a1a51008 | 4271 | stream_putc(s, attr_len); |
e496b420 | 4272 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); |
a1a51008 | 4273 | stream_putw(s, tlv_len); |
a3e3b5b0 RS |
4274 | stream_putc(s, 0); /* reserved */ |
4275 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO); | |
a1a51008 | 4276 | stream_putw(s, subtlv_len); |
e496b420 HS |
4277 | stream_putc(s, 0); /* reserved */ |
4278 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4279 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4280 | stream_putc(s, 0); /* sid_flags */ | |
4281 | stream_putw(s, 0xffff); /* endpoint */ | |
4282 | stream_putc(s, 0); /* reserved */ | |
a1a51008 RS |
4283 | stream_putc( |
4284 | s, | |
4285 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE); | |
4286 | stream_putw( | |
4287 | s, | |
4288 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH); | |
4289 | stream_putc(s, attr->srv6_l3vpn->loc_block_len); | |
4290 | stream_putc(s, attr->srv6_l3vpn->loc_node_len); | |
4291 | stream_putc(s, attr->srv6_l3vpn->func_len); | |
4292 | stream_putc(s, attr->srv6_l3vpn->arg_len); | |
4293 | stream_putc(s, attr->srv6_l3vpn->transposition_len); | |
4294 | stream_putc(s, attr->srv6_l3vpn->transposition_offset); | |
e496b420 HS |
4295 | } else if (attr->srv6_vpn) { |
4296 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4297 | | BGP_ATTR_FLAG_TRANS); | |
4298 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4299 | stream_putc(s, 22); /* tlv len */ | |
4300 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4301 | stream_putw(s, 0x13); /* tlv len */ | |
4302 | stream_putc(s, 0x00); /* reserved */ | |
4303 | stream_putc(s, 0x01); /* sid_type */ | |
4304 | stream_putc(s, 0x00); /* sif_flags */ | |
4305 | stream_put(s, &attr->srv6_vpn->sid, | |
4306 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4307 | } | |
4308 | } | |
4309 | ||
d62a17ae | 4310 | if (send_as4_path) { |
4311 | /* If the peer is NOT As4 capable, AND */ | |
4312 | /* there are ASnums > 65535 in path THEN | |
4313 | * give out AS4_PATH */ | |
4314 | ||
4315 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4316 | * path segments! | |
4317 | * Hm, I wonder... confederation things *should* only be at | |
4318 | * the beginning of an aspath, right? Then we should use | |
4319 | * aspath_delete_confed_seq for this, because it is already | |
4320 | * there! (JK) | |
4321 | * Folks, talk to me: what is reasonable here!? | |
4322 | */ | |
4323 | aspath = aspath_delete_confed_seq(aspath); | |
4324 | ||
996c9314 LB |
4325 | stream_putc(s, |
4326 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4327 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4328 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4329 | aspath_sizep = stream_get_endp(s); | |
4330 | stream_putw(s, 0); | |
4331 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4332 | } | |
4333 | ||
4334 | if (aspath != attr->aspath) | |
4335 | aspath_free(aspath); | |
4336 | ||
4337 | if (send_as4_aggregator) { | |
4338 | /* send AS4_AGGREGATOR, at this place */ | |
4339 | /* this section of code moved here in order to ensure the | |
4340 | * correct | |
4341 | * *ascending* order of attributes | |
4342 | */ | |
4343 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4344 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4345 | stream_putc(s, 8); | |
4346 | stream_putl(s, attr->aggregator_as); | |
4347 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4348 | } | |
4349 | ||
4350 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4351 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4352 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4353 | /* Tunnel Encap attribute */ | |
4354 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4355 | |
1e20238a | 4356 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4357 | /* VNC attribute */ |
4358 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4359 | #endif |
d62a17ae | 4360 | } |
587ff0fd | 4361 | |
a21bd7a3 DW |
4362 | /* PMSI Tunnel */ |
4363 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4364 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4365 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4366 | stream_putc(s, 9); // Length | |
4367 | stream_putc(s, 0); // Flags | |
2a3f51cf | 4368 | stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr)); |
996c9314 LB |
4369 | stream_put(s, &(attr->label), |
4370 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4371 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4372 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4373 | } |
4374 | ||
d62a17ae | 4375 | /* Unknown transit attribute. */ |
04fb21e2 DS |
4376 | struct transit *transit = bgp_attr_get_transit(attr); |
4377 | ||
4378 | if (transit) | |
4379 | stream_put(s, transit->val, transit->length); | |
718e3744 | 4380 | |
d62a17ae | 4381 | /* Return total size of attribute. */ |
4382 | return stream_get_endp(s) - cp; | |
718e3744 | 4383 | } |
4384 | ||
d62a17ae | 4385 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4386 | { |
d62a17ae | 4387 | unsigned long attrlen_pnt; |
4388 | iana_afi_t pkt_afi; | |
5c525538 | 4389 | iana_safi_t pkt_safi; |
718e3744 | 4390 | |
d62a17ae | 4391 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4392 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4393 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4394 | |
d62a17ae | 4395 | attrlen_pnt = stream_get_endp(s); |
4396 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4397 | |
d62a17ae | 4398 | /* Convert AFI, SAFI to values for packet. */ |
4399 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4400 | |
d62a17ae | 4401 | stream_putw(s, pkt_afi); |
4402 | stream_putc(s, pkt_safi); | |
9cabb64b | 4403 | |
d62a17ae | 4404 | return attrlen_pnt; |
8c71e481 | 4405 | } |
718e3744 | 4406 | |
5f040085 DS |
4407 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4408 | afi_t afi, safi_t safi, | |
4409 | const struct prefix_rd *prd, | |
d7c0a89a | 4410 | mpls_label_t *label, uint32_t num_labels, |
be92fc9f | 4411 | bool addpath_capable, uint32_t addpath_tx_id, |
b57ba6d2 | 4412 | struct attr *attr) |
8c71e481 | 4413 | { |
d7c0a89a | 4414 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 4415 | |
b57ba6d2 | 4416 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4417 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4418 | num_labels = 1; |
4419 | } | |
cd1964ff | 4420 | |
d90b788e | 4421 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
be92fc9f | 4422 | addpath_capable, addpath_tx_id, attr); |
8c71e481 | 4423 | } |
718e3744 | 4424 | |
d62a17ae | 4425 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4426 | { |
d62a17ae | 4427 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4428 | } |
4429 | ||
4430 | /* Initialization of attribute. */ | |
d62a17ae | 4431 | void bgp_attr_init(void) |
718e3744 | 4432 | { |
d62a17ae | 4433 | aspath_init(); |
4434 | attrhash_init(); | |
4435 | community_init(); | |
4436 | ecommunity_init(); | |
4437 | lcommunity_init(); | |
4438 | cluster_init(); | |
4439 | transit_init(); | |
4440 | encap_init(); | |
e496b420 | 4441 | srv6_init(); |
718e3744 | 4442 | } |
4443 | ||
d62a17ae | 4444 | void bgp_attr_finish(void) |
228da428 | 4445 | { |
d62a17ae | 4446 | aspath_finish(); |
4447 | attrhash_finish(); | |
4448 | community_finish(); | |
4449 | ecommunity_finish(); | |
4450 | lcommunity_finish(); | |
4451 | cluster_finish(); | |
4452 | transit_finish(); | |
4453 | encap_finish(); | |
e496b420 | 4454 | srv6_finish(); |
228da428 CC |
4455 | } |
4456 | ||
718e3744 | 4457 | /* Make attribute packet. */ |
d62a17ae | 4458 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
bd494ec5 | 4459 | const struct prefix *prefix) |
d62a17ae | 4460 | { |
4461 | unsigned long cp; | |
4462 | unsigned long len; | |
4463 | size_t aspath_lenp; | |
4464 | struct aspath *aspath; | |
be92fc9f | 4465 | bool addpath_capable = false; |
d7c0a89a | 4466 | uint32_t addpath_tx_id = 0; |
d62a17ae | 4467 | |
4468 | /* Remember current pointer. */ | |
4469 | cp = stream_get_endp(s); | |
4470 | ||
4471 | /* Place holder of length. */ | |
4472 | stream_putw(s, 0); | |
4473 | ||
4474 | /* Origin attribute. */ | |
4475 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4476 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4477 | stream_putc(s, 1); | |
4478 | stream_putc(s, attr->origin); | |
4479 | ||
4480 | aspath = attr->aspath; | |
4481 | ||
4482 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4483 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4484 | aspath_lenp = stream_get_endp(s); | |
4485 | stream_putw(s, 0); | |
4486 | ||
4487 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4488 | ||
4489 | /* Nexthop attribute. */ | |
4490 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4491 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4492 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4493 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4494 | stream_putc(s, 4); | |
4495 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4496 | } |
d62a17ae | 4497 | |
4498 | /* MED attribute. */ | |
4499 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4500 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4501 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4502 | stream_putc(s, 4); | |
4503 | stream_putl(s, attr->med); | |
4504 | } | |
4505 | ||
4506 | /* Local preference. */ | |
4507 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4508 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4509 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4510 | stream_putc(s, 4); | |
4511 | stream_putl(s, attr->local_pref); | |
4512 | } | |
4513 | ||
4514 | /* Atomic aggregate. */ | |
4515 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4516 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4517 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4518 | stream_putc(s, 0); | |
4519 | } | |
4520 | ||
4521 | /* Aggregator. */ | |
4522 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4523 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4524 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4525 | stream_putc(s, 8); | |
4526 | stream_putl(s, attr->aggregator_as); | |
4527 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4528 | } | |
4529 | ||
4530 | /* Community attribute. */ | |
4531 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
4532 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4533 | stream_putc(s, |
4534 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4535 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4536 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4537 | stream_putw(s, attr->community->size * 4); | |
4538 | } else { | |
996c9314 LB |
4539 | stream_putc(s, |
4540 | BGP_ATTR_FLAG_OPTIONAL | |
4541 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4542 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4543 | stream_putc(s, attr->community->size * 4); | |
4544 | } | |
4545 | stream_put(s, attr->community->val, attr->community->size * 4); | |
4546 | } | |
4547 | ||
4548 | /* Large Community attribute. */ | |
4549 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 4550 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4551 | stream_putc(s, |
4552 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4553 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4554 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4555 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4556 | } else { |
996c9314 LB |
4557 | stream_putc(s, |
4558 | BGP_ATTR_FLAG_OPTIONAL | |
4559 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4560 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4561 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4562 | } |
4563 | ||
996c9314 LB |
4564 | stream_put(s, attr->lcommunity->val, |
4565 | lcom_length(attr->lcommunity)); | |
d62a17ae | 4566 | } |
4567 | ||
4568 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
4569 | if (prefix != NULL && prefix->family == AF_INET6 | |
4570 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
4571 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
4572 | int sizep; | |
4573 | ||
4574 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4575 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
4576 | sizep = stream_get_endp(s); | |
4577 | ||
4578 | /* MP header */ | |
4579 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
4580 | stream_putw(s, AFI_IP6); /* AFI */ | |
4581 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
4582 | ||
4583 | /* Next hop */ | |
4584 | stream_putc(s, attr->mp_nexthop_len); | |
4585 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
4586 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
4587 | stream_put(s, &attr->mp_nexthop_local, | |
4588 | IPV6_MAX_BYTELEN); | |
4589 | ||
4590 | /* SNPA */ | |
4591 | stream_putc(s, 0); | |
4592 | ||
4593 | /* Prefix */ | |
be92fc9f | 4594 | stream_put_prefix_addpath(s, prefix, addpath_capable, |
d62a17ae | 4595 | addpath_tx_id); |
4596 | ||
4597 | /* Set MP attribute length. */ | |
4598 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
4599 | } | |
4600 | ||
4601 | /* Prefix SID */ | |
4602 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
4603 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4604 | stream_putc(s, |
4605 | BGP_ATTR_FLAG_OPTIONAL | |
4606 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4607 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4608 | stream_putc(s, 10); | |
4609 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4610 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4611 | stream_putc(s, 0); // reserved | |
4612 | stream_putw(s, 0); // flags | |
4613 | stream_putl(s, attr->label_index); | |
4614 | } | |
4615 | } | |
4616 | ||
4617 | /* Return total size of attribute. */ | |
4618 | len = stream_get_endp(s) - cp - 2; | |
4619 | stream_putw_at(s, cp, len); | |
718e3744 | 4620 | } |