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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"}, | |
71 | {BGP_ATTR_DPA, "DPA"}, | |
72 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
73 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
74 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
75 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
76 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
77 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
78 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
79 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 80 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 81 | {BGP_ATTR_ENCAP, "ENCAP"}, |
1e20238a | 82 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 83 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 84 | #endif |
d62a17ae | 85 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
86 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
9a659715 | 87 | {BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"}, |
d62a17ae | 88 | {0}}; |
afcb7679 | 89 | |
996c9314 LB |
90 | static const struct message attr_flag_str[] = { |
91 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
92 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
93 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
94 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
95 | this list */ | |
96 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
97 | {0}}; | |
6b0655a2 | 98 | |
9bddac4b | 99 | static struct hash *cluster_hash; |
718e3744 | 100 | |
d62a17ae | 101 | static void *cluster_hash_alloc(void *p) |
718e3744 | 102 | { |
d62a17ae | 103 | const struct cluster_list *val = (const struct cluster_list *)p; |
104 | struct cluster_list *cluster; | |
718e3744 | 105 | |
d62a17ae | 106 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
107 | cluster->length = val->length; | |
718e3744 | 108 | |
d62a17ae | 109 | if (cluster->length) { |
110 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
111 | memcpy(cluster->list, val->list, val->length); | |
112 | } else | |
113 | cluster->list = NULL; | |
718e3744 | 114 | |
d62a17ae | 115 | cluster->refcnt = 0; |
718e3744 | 116 | |
d62a17ae | 117 | return cluster; |
718e3744 | 118 | } |
119 | ||
120 | /* Cluster list related functions. */ | |
d62a17ae | 121 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 122 | { |
628565c7 | 123 | struct cluster_list tmp = {}; |
d62a17ae | 124 | struct cluster_list *cluster; |
718e3744 | 125 | |
d62a17ae | 126 | tmp.length = length; |
628565c7 | 127 | tmp.list = length == 0 ? NULL : pnt; |
718e3744 | 128 | |
d62a17ae | 129 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
130 | cluster->refcnt++; | |
131 | return cluster; | |
718e3744 | 132 | } |
133 | ||
3dc339cd | 134 | bool cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 135 | { |
d62a17ae | 136 | int i; |
137 | ||
138 | for (i = 0; i < cluster->length / 4; i++) | |
139 | if (cluster->list[i].s_addr == originator.s_addr) | |
3dc339cd DA |
140 | return true; |
141 | return false; | |
718e3744 | 142 | } |
143 | ||
d8b87afe | 144 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 145 | { |
d62a17ae | 146 | const struct cluster_list *cluster = p; |
718e3744 | 147 | |
d62a17ae | 148 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 149 | } |
150 | ||
74df8d6d | 151 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 152 | { |
d62a17ae | 153 | const struct cluster_list *cluster1 = p1; |
154 | const struct cluster_list *cluster2 = p2; | |
923de654 | 155 | |
f22ed884 QY |
156 | if (cluster1->list == cluster2->list) |
157 | return true; | |
158 | ||
159 | if (!cluster1->list || !cluster2->list) | |
160 | return false; | |
161 | ||
162 | if (cluster1->length != cluster2->length) | |
163 | return false; | |
164 | ||
165 | return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 166 | } |
167 | ||
d62a17ae | 168 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 169 | { |
0a22ddfb | 170 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 171 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 172 | } |
173 | ||
d62a17ae | 174 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 175 | { |
d62a17ae | 176 | struct cluster_list *find; |
718e3744 | 177 | |
d62a17ae | 178 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
179 | find->refcnt++; | |
718e3744 | 180 | |
d62a17ae | 181 | return find; |
718e3744 | 182 | } |
183 | ||
628565c7 | 184 | static void cluster_unintern(struct cluster_list **cluster) |
718e3744 | 185 | { |
628565c7 QY |
186 | if ((*cluster)->refcnt) |
187 | (*cluster)->refcnt--; | |
188 | ||
189 | if ((*cluster)->refcnt == 0) { | |
190 | void *p = hash_release(cluster_hash, *cluster); | |
191 | assert(p == *cluster); | |
192 | cluster_free(*cluster); | |
193 | *cluster = NULL; | |
d62a17ae | 194 | } |
718e3744 | 195 | } |
196 | ||
d62a17ae | 197 | static void cluster_init(void) |
718e3744 | 198 | { |
996c9314 | 199 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 200 | "BGP Cluster"); |
718e3744 | 201 | } |
228da428 | 202 | |
d62a17ae | 203 | static void cluster_finish(void) |
228da428 | 204 | { |
d62a17ae | 205 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
206 | hash_free(cluster_hash); | |
207 | cluster_hash = NULL; | |
228da428 | 208 | } |
6b0655a2 | 209 | |
bede7744 | 210 | static struct hash *encap_hash = NULL; |
1e20238a | 211 | #ifdef ENABLE_BGP_VNC |
bede7744 LB |
212 | static struct hash *vnc_hash = NULL; |
213 | #endif | |
e496b420 HS |
214 | static struct hash *srv6_l3vpn_hash; |
215 | static struct hash *srv6_vpn_hash; | |
bede7744 | 216 | |
d62a17ae | 217 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 218 | { |
d62a17ae | 219 | struct bgp_attr_encap_subtlv *new; |
220 | struct bgp_attr_encap_subtlv *tail; | |
221 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 222 | |
d62a17ae | 223 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 224 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 225 | if (tail) { |
226 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
227 | tail = tail->next; | |
228 | } else { | |
229 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
230 | } | |
231 | assert(tail); | |
232 | memcpy(tail, p, size); | |
233 | tail->next = NULL; | |
f4c89855 | 234 | } |
f4c89855 | 235 | |
d62a17ae | 236 | return new; |
f4c89855 LB |
237 | } |
238 | ||
d62a17ae | 239 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 240 | { |
d62a17ae | 241 | struct bgp_attr_encap_subtlv *next; |
242 | while (p) { | |
243 | next = p->next; | |
244 | p->next = NULL; | |
245 | XFREE(MTYPE_ENCAP_TLV, p); | |
246 | p = next; | |
247 | } | |
f4c89855 LB |
248 | } |
249 | ||
d62a17ae | 250 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 251 | { |
d62a17ae | 252 | if (!attr) |
253 | return; | |
f4c89855 | 254 | |
d62a17ae | 255 | if (attr->encap_subtlvs) { |
256 | encap_free(attr->encap_subtlvs); | |
257 | attr->encap_subtlvs = NULL; | |
258 | } | |
1e20238a | 259 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 260 | if (attr->vnc_subtlvs) { |
261 | encap_free(attr->vnc_subtlvs); | |
262 | attr->vnc_subtlvs = NULL; | |
263 | } | |
65efcfce | 264 | #endif |
f4c89855 LB |
265 | } |
266 | ||
267 | /* | |
268 | * Compare encap sub-tlv chains | |
269 | * | |
270 | * 1 = equivalent | |
271 | * 0 = not equivalent | |
272 | * | |
273 | * This algorithm could be made faster if needed | |
274 | */ | |
3dc339cd DA |
275 | static bool encap_same(const struct bgp_attr_encap_subtlv *h1, |
276 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 277 | { |
36de6e0e A |
278 | const struct bgp_attr_encap_subtlv *p; |
279 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 280 | |
d62a17ae | 281 | if (h1 == h2) |
3dc339cd | 282 | return true; |
d62a17ae | 283 | if (h1 == NULL || h2 == NULL) |
3dc339cd | 284 | return false; |
f4c89855 | 285 | |
d62a17ae | 286 | for (p = h1; p; p = p->next) { |
287 | for (q = h2; q; q = q->next) { | |
288 | if ((p->type == q->type) && (p->length == q->length) | |
289 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 290 | |
d62a17ae | 291 | break; |
292 | } | |
293 | } | |
294 | if (!q) | |
3dc339cd | 295 | return false; |
f4c89855 | 296 | } |
f4c89855 | 297 | |
d62a17ae | 298 | for (p = h2; p; p = p->next) { |
299 | for (q = h1; q; q = q->next) { | |
300 | if ((p->type == q->type) && (p->length == q->length) | |
301 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 302 | |
d62a17ae | 303 | break; |
304 | } | |
305 | } | |
306 | if (!q) | |
3dc339cd | 307 | return false; |
f4c89855 | 308 | } |
f4c89855 | 309 | |
3dc339cd | 310 | return true; |
f4c89855 LB |
311 | } |
312 | ||
d62a17ae | 313 | static void *encap_hash_alloc(void *p) |
bede7744 | 314 | { |
d62a17ae | 315 | /* Encap structure is already allocated. */ |
316 | return p; | |
bede7744 LB |
317 | } |
318 | ||
d62a17ae | 319 | typedef enum { |
320 | ENCAP_SUBTLV_TYPE, | |
1e20238a | 321 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 322 | VNC_SUBTLV_TYPE |
bede7744 LB |
323 | #endif |
324 | } encap_subtlv_type; | |
325 | ||
326 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 327 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 328 | { |
d62a17ae | 329 | struct bgp_attr_encap_subtlv *find; |
330 | struct hash *hash = encap_hash; | |
1e20238a | 331 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 332 | if (type == VNC_SUBTLV_TYPE) |
333 | hash = vnc_hash; | |
bede7744 LB |
334 | #endif |
335 | ||
d62a17ae | 336 | find = hash_get(hash, encap, encap_hash_alloc); |
337 | if (find != encap) | |
338 | encap_free(encap); | |
339 | find->refcnt++; | |
bede7744 | 340 | |
d62a17ae | 341 | return find; |
bede7744 LB |
342 | } |
343 | ||
d62a17ae | 344 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
345 | encap_subtlv_type type) | |
bede7744 | 346 | { |
d62a17ae | 347 | struct bgp_attr_encap_subtlv *encap = *encapp; |
348 | if (encap->refcnt) | |
349 | encap->refcnt--; | |
bede7744 | 350 | |
d62a17ae | 351 | if (encap->refcnt == 0) { |
352 | struct hash *hash = encap_hash; | |
1e20238a | 353 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 354 | if (type == VNC_SUBTLV_TYPE) |
355 | hash = vnc_hash; | |
bede7744 | 356 | #endif |
d62a17ae | 357 | hash_release(hash, encap); |
358 | encap_free(encap); | |
359 | *encapp = NULL; | |
360 | } | |
bede7744 LB |
361 | } |
362 | ||
d8b87afe | 363 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 364 | { |
d62a17ae | 365 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 366 | |
d62a17ae | 367 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
368 | } |
369 | ||
74df8d6d | 370 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 371 | { |
36de6e0e A |
372 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
373 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
374 | } |
375 | ||
d62a17ae | 376 | static void encap_init(void) |
bede7744 | 377 | { |
996c9314 | 378 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 379 | "BGP Encap Hash"); |
1e20238a | 380 | #ifdef ENABLE_BGP_VNC |
996c9314 | 381 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 382 | "BGP VNC Hash"); |
bede7744 LB |
383 | #endif |
384 | } | |
385 | ||
d62a17ae | 386 | static void encap_finish(void) |
bede7744 | 387 | { |
d62a17ae | 388 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
389 | hash_free(encap_hash); | |
390 | encap_hash = NULL; | |
1e20238a | 391 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 392 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
393 | hash_free(vnc_hash); | |
394 | vnc_hash = NULL; | |
bede7744 LB |
395 | #endif |
396 | } | |
397 | ||
d62a17ae | 398 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 399 | { |
d62a17ae | 400 | if (!a1 && a2) |
401 | return false; | |
402 | if (!a2 && a1) | |
403 | return false; | |
404 | if (!a1 && !a2) | |
405 | return true; | |
406 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
ea7741a0 | 407 | sizeof(struct bgp_route_evpn)); |
684a7227 PG |
408 | } |
409 | ||
718e3744 | 410 | /* Unknown transit attribute. */ |
9bddac4b | 411 | static struct hash *transit_hash; |
718e3744 | 412 | |
d62a17ae | 413 | static void transit_free(struct transit *transit) |
718e3744 | 414 | { |
0a22ddfb | 415 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 416 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 417 | } |
418 | ||
d62a17ae | 419 | static void *transit_hash_alloc(void *p) |
718e3744 | 420 | { |
d62a17ae | 421 | /* Transit structure is already allocated. */ |
422 | return p; | |
718e3744 | 423 | } |
424 | ||
d62a17ae | 425 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 426 | { |
d62a17ae | 427 | struct transit *find; |
718e3744 | 428 | |
d62a17ae | 429 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
430 | if (find != transit) | |
431 | transit_free(transit); | |
432 | find->refcnt++; | |
718e3744 | 433 | |
d62a17ae | 434 | return find; |
718e3744 | 435 | } |
436 | ||
547357c4 | 437 | static void transit_unintern(struct transit **transit) |
718e3744 | 438 | { |
547357c4 QY |
439 | if ((*transit)->refcnt) |
440 | (*transit)->refcnt--; | |
718e3744 | 441 | |
547357c4 QY |
442 | if ((*transit)->refcnt == 0) { |
443 | hash_release(transit_hash, *transit); | |
444 | transit_free(*transit); | |
445 | *transit = NULL; | |
d62a17ae | 446 | } |
718e3744 | 447 | } |
448 | ||
e496b420 HS |
449 | static void *srv6_l3vpn_hash_alloc(void *p) |
450 | { | |
451 | return p; | |
452 | } | |
453 | ||
454 | static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn) | |
455 | { | |
456 | XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn); | |
457 | } | |
458 | ||
459 | static struct bgp_attr_srv6_l3vpn * | |
460 | srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn) | |
461 | { | |
462 | struct bgp_attr_srv6_l3vpn *find; | |
463 | ||
464 | find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc); | |
465 | if (find != l3vpn) | |
466 | srv6_l3vpn_free(l3vpn); | |
467 | find->refcnt++; | |
468 | return find; | |
469 | } | |
470 | ||
471 | static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp) | |
472 | { | |
473 | struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp; | |
474 | ||
475 | if (l3vpn->refcnt) | |
476 | l3vpn->refcnt--; | |
477 | ||
478 | if (l3vpn->refcnt == 0) { | |
479 | hash_release(srv6_l3vpn_hash, l3vpn); | |
480 | srv6_l3vpn_free(l3vpn); | |
481 | *l3vpnp = NULL; | |
482 | } | |
483 | } | |
484 | ||
485 | static void *srv6_vpn_hash_alloc(void *p) | |
486 | { | |
487 | return p; | |
488 | } | |
489 | ||
490 | static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn) | |
491 | { | |
492 | XFREE(MTYPE_BGP_SRV6_VPN, vpn); | |
493 | } | |
494 | ||
495 | static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn) | |
496 | { | |
497 | struct bgp_attr_srv6_vpn *find; | |
498 | ||
499 | find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc); | |
500 | if (find != vpn) | |
501 | srv6_vpn_free(vpn); | |
502 | find->refcnt++; | |
503 | return find; | |
504 | } | |
505 | ||
506 | static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp) | |
507 | { | |
508 | struct bgp_attr_srv6_vpn *vpn = *vpnp; | |
509 | ||
510 | if (vpn->refcnt) | |
511 | vpn->refcnt--; | |
512 | ||
513 | if (vpn->refcnt == 0) { | |
514 | hash_release(srv6_vpn_hash, vpn); | |
515 | srv6_vpn_free(vpn); | |
516 | *vpnp = NULL; | |
517 | } | |
518 | } | |
519 | ||
520 | static uint32_t srv6_l3vpn_hash_key_make(const void *p) | |
521 | { | |
522 | const struct bgp_attr_srv6_l3vpn *l3vpn = p; | |
523 | uint32_t key = 0; | |
524 | ||
525 | key = jhash(&l3vpn->sid, 16, key); | |
526 | key = jhash_1word(l3vpn->sid_flags, key); | |
527 | key = jhash_1word(l3vpn->endpoint_behavior, key); | |
528 | return key; | |
529 | } | |
530 | ||
531 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
532 | { | |
533 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
534 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
535 | ||
536 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
537 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
538 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior; | |
539 | } | |
540 | ||
541 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
542 | const struct bgp_attr_srv6_l3vpn *h2) | |
543 | { | |
544 | if (h1 == h2) | |
545 | return true; | |
546 | else if (h1 == NULL || h2 == NULL) | |
547 | return false; | |
548 | else | |
549 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
550 | } | |
551 | ||
552 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
553 | { | |
554 | const struct bgp_attr_srv6_vpn *vpn = p; | |
555 | uint32_t key = 0; | |
556 | ||
557 | key = jhash(&vpn->sid, 16, key); | |
558 | key = jhash_1word(vpn->sid_flags, key); | |
559 | return key; | |
560 | } | |
561 | ||
562 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
563 | { | |
564 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
565 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
566 | ||
567 | return sid_same(&vpn1->sid, &vpn2->sid) | |
568 | && vpn1->sid_flags == vpn2->sid_flags; | |
569 | } | |
570 | ||
571 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
572 | const struct bgp_attr_srv6_vpn *h2) | |
573 | { | |
574 | if (h1 == h2) | |
575 | return true; | |
576 | else if (h1 == NULL || h2 == NULL) | |
577 | return false; | |
578 | else | |
579 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
580 | } | |
581 | ||
582 | static void srv6_init(void) | |
583 | { | |
584 | srv6_l3vpn_hash = | |
585 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
586 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
587 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
588 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
589 | } | |
590 | ||
591 | static void srv6_finish(void) | |
592 | { | |
593 | hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free); | |
594 | hash_free(srv6_l3vpn_hash); | |
595 | srv6_l3vpn_hash = NULL; | |
596 | hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
597 | hash_free(srv6_vpn_hash); | |
598 | srv6_vpn_hash = NULL; | |
599 | } | |
600 | ||
d8b87afe | 601 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 602 | { |
d62a17ae | 603 | const struct transit *transit = p; |
718e3744 | 604 | |
d62a17ae | 605 | return jhash(transit->val, transit->length, 0); |
718e3744 | 606 | } |
607 | ||
74df8d6d | 608 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 609 | { |
d62a17ae | 610 | const struct transit *transit1 = p1; |
611 | const struct transit *transit2 = p2; | |
923de654 | 612 | |
d62a17ae | 613 | return (transit1->length == transit2->length |
614 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 615 | } |
616 | ||
d62a17ae | 617 | static void transit_init(void) |
718e3744 | 618 | { |
996c9314 | 619 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 620 | "BGP Transit Hash"); |
718e3744 | 621 | } |
228da428 | 622 | |
d62a17ae | 623 | static void transit_finish(void) |
228da428 | 624 | { |
d62a17ae | 625 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
626 | hash_free(transit_hash); | |
627 | transit_hash = NULL; | |
228da428 | 628 | } |
6b0655a2 | 629 | |
718e3744 | 630 | /* Attribute hash routines. */ |
9bddac4b | 631 | static struct hash *attrhash; |
718e3744 | 632 | |
d62a17ae | 633 | unsigned long int attr_count(void) |
cbdfbaa5 | 634 | { |
d62a17ae | 635 | return attrhash->count; |
cbdfbaa5 PJ |
636 | } |
637 | ||
d62a17ae | 638 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 639 | { |
d62a17ae | 640 | return transit_hash->count; |
cbdfbaa5 PJ |
641 | } |
642 | ||
d8b87afe | 643 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 644 | { |
d62a17ae | 645 | const struct attr *attr = (struct attr *)p; |
646 | uint32_t key = 0; | |
c8e7b895 | 647 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 648 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 649 | |
0d0268a6 | 650 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
651 | MIX3(attr->local_pref, attr->aggregator_as, |
652 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
653 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
654 | attr->originator_id.s_addr); | |
655 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 656 | |
657 | if (attr->aspath) | |
658 | MIX(aspath_key_make(attr->aspath)); | |
659 | if (attr->community) | |
660 | MIX(community_hash_make(attr->community)); | |
661 | ||
662 | if (attr->lcommunity) | |
663 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
664 | if (attr->ecommunity) | |
665 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
9a659715 PG |
666 | if (attr->ipv6_ecommunity) |
667 | MIX(ecommunity_hash_make(attr->ipv6_ecommunity)); | |
d62a17ae | 668 | if (attr->cluster) |
669 | MIX(cluster_hash_key_make(attr->cluster)); | |
670 | if (attr->transit) | |
671 | MIX(transit_hash_key_make(attr->transit)); | |
672 | if (attr->encap_subtlvs) | |
673 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
1e20238a | 674 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 675 | if (attr->vnc_subtlvs) |
676 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 677 | #endif |
d62a17ae | 678 | MIX(attr->mp_nexthop_len); |
679 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
680 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 681 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 682 | MIX(attr->rmap_table_id); |
d62a17ae | 683 | |
684 | return key; | |
685 | } | |
686 | ||
74df8d6d | 687 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 688 | { |
689 | const struct attr *attr1 = p1; | |
690 | const struct attr *attr2 = p2; | |
691 | ||
692 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
693 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
694 | && attr1->aspath == attr2->aspath | |
695 | && attr1->community == attr2->community && attr1->med == attr2->med | |
696 | && attr1->local_pref == attr2->local_pref | |
697 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
698 | if (attr1->aggregator_as == attr2->aggregator_as | |
699 | && attr1->aggregator_addr.s_addr | |
700 | == attr2->aggregator_addr.s_addr | |
701 | && attr1->weight == attr2->weight | |
702 | && attr1->tag == attr2->tag | |
703 | && attr1->label_index == attr2->label_index | |
704 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 705 | && attr1->ecommunity == attr2->ecommunity |
9a659715 | 706 | && attr1->ipv6_ecommunity == attr2->ipv6_ecommunity |
d62a17ae | 707 | && attr1->lcommunity == attr2->lcommunity |
708 | && attr1->cluster == attr2->cluster | |
709 | && attr1->transit == attr2->transit | |
951745bd | 710 | && attr1->rmap_table_id == attr2->rmap_table_id |
d62a17ae | 711 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) |
712 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 713 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 714 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 715 | #endif |
0d0268a6 LB |
716 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
717 | &attr2->mp_nexthop_global) | |
718 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
719 | &attr2->mp_nexthop_local) | |
720 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
721 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 722 | && IPV4_ADDR_SAME(&attr1->originator_id, |
723 | &attr2->originator_id) | |
77e62f2b | 724 | && overlay_index_same(attr1, attr2) |
0a50c248 | 725 | && !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) |
7904e9fd AK |
726 | && attr1->es_flags == attr2->es_flags |
727 | && attr1->mm_sync_seqnum == attr2->mm_sync_seqnum | |
74e2bd89 AK |
728 | && attr1->df_pref == attr2->df_pref |
729 | && attr1->df_alg == attr2->df_alg | |
77e62f2b | 730 | && attr1->nh_ifindex == attr2->nh_ifindex |
7b7d48e5 | 731 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex |
e496b420 HS |
732 | && attr1->distance == attr2->distance |
733 | && srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) | |
ef3e0d04 SM |
734 | && srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) |
735 | && attr1->srte_color == attr2->srte_color) | |
74df8d6d | 736 | return true; |
d62a17ae | 737 | } |
aadc0905 | 738 | |
74df8d6d | 739 | return false; |
718e3744 | 740 | } |
741 | ||
d62a17ae | 742 | static void attrhash_init(void) |
718e3744 | 743 | { |
996c9314 LB |
744 | attrhash = |
745 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 746 | } |
747 | ||
289d2501 LB |
748 | /* |
749 | * special for hash_clean below | |
750 | */ | |
d62a17ae | 751 | static void attr_vfree(void *attr) |
289d2501 | 752 | { |
d62a17ae | 753 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
754 | } |
755 | ||
d62a17ae | 756 | static void attrhash_finish(void) |
228da428 | 757 | { |
d62a17ae | 758 | hash_clean(attrhash, attr_vfree); |
759 | hash_free(attrhash); | |
760 | attrhash = NULL; | |
228da428 CC |
761 | } |
762 | ||
e3b78da8 | 763 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 764 | { |
e3b78da8 | 765 | struct attr *attr = bucket->data; |
e496b420 | 766 | char sid_str[BUFSIZ]; |
718e3744 | 767 | |
23d0a753 | 768 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 HS |
769 | |
770 | sid_str[0] = '\0'; | |
771 | if (attr->srv6_l3vpn) | |
772 | inet_ntop(AF_INET6, &attr->srv6_l3vpn->sid, sid_str, BUFSIZ); | |
773 | else if (attr->srv6_vpn) | |
774 | inet_ntop(AF_INET6, &attr->srv6_vpn->sid, sid_str, BUFSIZ); | |
775 | ||
776 | vty_out(vty, | |
6cde4b45 | 777 | "\tflags: %" PRIu64" med: %u local_pref: %u origin: %u weight: %u label: %u sid: %s\n", |
23a2a47e | 778 | attr->flag, attr->med, attr->local_pref, attr->origin, |
e496b420 | 779 | attr->weight, attr->label, sid_str); |
718e3744 | 780 | } |
781 | ||
d62a17ae | 782 | void attr_show_all(struct vty *vty) |
718e3744 | 783 | { |
e3b78da8 | 784 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
785 | void *))attr_show_all_iterator, |
786 | vty); | |
718e3744 | 787 | } |
788 | ||
d62a17ae | 789 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 790 | { |
d62a17ae | 791 | struct attr *val = (struct attr *)p; |
792 | struct attr *attr; | |
718e3744 | 793 | |
d62a17ae | 794 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
795 | *attr = *val; | |
796 | if (val->encap_subtlvs) { | |
797 | val->encap_subtlvs = NULL; | |
798 | } | |
1e20238a | 799 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 800 | if (val->vnc_subtlvs) { |
801 | val->vnc_subtlvs = NULL; | |
802 | } | |
65efcfce | 803 | #endif |
e496b420 HS |
804 | if (val->srv6_l3vpn) |
805 | val->srv6_l3vpn = NULL; | |
806 | if (val->srv6_vpn) | |
807 | val->srv6_vpn = NULL; | |
808 | ||
d62a17ae | 809 | attr->refcnt = 0; |
810 | return attr; | |
718e3744 | 811 | } |
812 | ||
813 | /* Internet argument attribute. */ | |
d62a17ae | 814 | struct attr *bgp_attr_intern(struct attr *attr) |
815 | { | |
816 | struct attr *find; | |
817 | ||
818 | /* Intern referenced strucutre. */ | |
819 | if (attr->aspath) { | |
820 | if (!attr->aspath->refcnt) | |
821 | attr->aspath = aspath_intern(attr->aspath); | |
822 | else | |
823 | attr->aspath->refcnt++; | |
824 | } | |
825 | if (attr->community) { | |
826 | if (!attr->community->refcnt) | |
827 | attr->community = community_intern(attr->community); | |
828 | else | |
829 | attr->community->refcnt++; | |
830 | } | |
831 | ||
832 | if (attr->ecommunity) { | |
833 | if (!attr->ecommunity->refcnt) | |
834 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
835 | else | |
836 | attr->ecommunity->refcnt++; | |
837 | } | |
9a659715 PG |
838 | |
839 | if (attr->ipv6_ecommunity) { | |
840 | if (!attr->ipv6_ecommunity->refcnt) | |
841 | attr->ipv6_ecommunity = | |
842 | ecommunity_intern(attr->ipv6_ecommunity); | |
843 | else | |
844 | attr->ipv6_ecommunity->refcnt++; | |
845 | } | |
846 | ||
d62a17ae | 847 | if (attr->lcommunity) { |
848 | if (!attr->lcommunity->refcnt) | |
849 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
850 | else | |
851 | attr->lcommunity->refcnt++; | |
852 | } | |
853 | if (attr->cluster) { | |
854 | if (!attr->cluster->refcnt) | |
855 | attr->cluster = cluster_intern(attr->cluster); | |
856 | else | |
857 | attr->cluster->refcnt++; | |
858 | } | |
859 | if (attr->transit) { | |
860 | if (!attr->transit->refcnt) | |
861 | attr->transit = transit_intern(attr->transit); | |
862 | else | |
863 | attr->transit->refcnt++; | |
864 | } | |
865 | if (attr->encap_subtlvs) { | |
866 | if (!attr->encap_subtlvs->refcnt) | |
867 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
868 | ENCAP_SUBTLV_TYPE); | |
869 | else | |
870 | attr->encap_subtlvs->refcnt++; | |
871 | } | |
e496b420 HS |
872 | if (attr->srv6_l3vpn) { |
873 | if (!attr->srv6_l3vpn->refcnt) | |
874 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
875 | else | |
876 | attr->srv6_l3vpn->refcnt++; | |
877 | } | |
878 | if (attr->srv6_vpn) { | |
879 | if (!attr->srv6_vpn->refcnt) | |
880 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
881 | else | |
882 | attr->srv6_vpn->refcnt++; | |
883 | } | |
1e20238a | 884 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 885 | if (attr->vnc_subtlvs) { |
886 | if (!attr->vnc_subtlvs->refcnt) | |
887 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
888 | VNC_SUBTLV_TYPE); | |
889 | else | |
890 | attr->vnc_subtlvs->refcnt++; | |
891 | } | |
aadc0905 | 892 | #endif |
bede7744 | 893 | |
dbbac180 DL |
894 | /* At this point, attr only contains intern'd pointers. that means |
895 | * if we find it in attrhash, it has all the same pointers and we | |
896 | * correctly updated the refcounts on these. | |
897 | * If we don't find it, we need to allocate a one because in all | |
898 | * cases this returns a new reference to a hashed attr, but the input | |
899 | * wasn't on hash. */ | |
d62a17ae | 900 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
901 | find->refcnt++; | |
902 | ||
903 | return find; | |
718e3744 | 904 | } |
905 | ||
906 | /* Make network statement's attribute. */ | |
d7c0a89a | 907 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 908 | { |
d62a17ae | 909 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 910 | |
d62a17ae | 911 | attr->origin = origin; |
912 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
913 | attr->aspath = aspath_empty(); | |
914 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
915 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
916 | attr->tag = 0; | |
917 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
918 | attr->label = MPLS_INVALID_LABEL; | |
919 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
920 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
921 | ||
922 | return attr; | |
718e3744 | 923 | } |
924 | ||
b5d58c32 | 925 | /* Create the attributes for an aggregate */ |
5f040085 DS |
926 | struct attr *bgp_attr_aggregate_intern( |
927 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
928 | struct community *community, struct ecommunity *ecommunity, | |
929 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
930 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 931 | { |
932 | struct attr attr; | |
933 | struct attr *new; | |
20894f50 | 934 | int ret; |
d62a17ae | 935 | |
936 | memset(&attr, 0, sizeof(struct attr)); | |
937 | ||
938 | /* Origin attribute. */ | |
939 | attr.origin = origin; | |
940 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
941 | ||
942 | /* AS path attribute. */ | |
943 | if (aspath) | |
944 | attr.aspath = aspath_intern(aspath); | |
945 | else | |
946 | attr.aspath = aspath_empty(); | |
947 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
948 | ||
949 | /* Next hop attribute. */ | |
950 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
951 | ||
952 | if (community) { | |
d7c0a89a | 953 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
954 | |
955 | /* If we are not shutting down ourselves and we are | |
956 | * aggregating a route that contains the GSHUT community we | |
957 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 958 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 959 | && community_include(community, gshut)) { |
7f323236 DW |
960 | community_del_val(community, &gshut); |
961 | } | |
962 | ||
d62a17ae | 963 | attr.community = community; |
964 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
965 | } | |
966 | ||
3da2cc32 DS |
967 | if (ecommunity) { |
968 | attr.ecommunity = ecommunity; | |
969 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
970 | } | |
971 | ||
dd18c5a9 DS |
972 | if (lcommunity) { |
973 | attr.lcommunity = lcommunity; | |
974 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
975 | } | |
976 | ||
637e5ba4 | 977 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 978 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 979 | |
d62a17ae | 980 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
981 | attr.label = MPLS_INVALID_LABEL; | |
982 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
983 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 984 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 985 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
986 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
987 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
988 | attr.aggregator_as = bgp->confed_id; | |
989 | else | |
990 | attr.aggregator_as = bgp->as; | |
991 | attr.aggregator_addr = bgp->router_id; | |
992 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
993 | attr.label = MPLS_INVALID_LABEL; | |
994 | ||
20894f50 DA |
995 | /* Apply route-map */ |
996 | if (aggregate->rmap.name) { | |
997 | struct attr attr_tmp = attr; | |
998 | struct bgp_path_info rmap_path; | |
999 | ||
1000 | memset(&rmap_path, 0, sizeof(struct bgp_path_info)); | |
1001 | rmap_path.peer = bgp->peer_self; | |
1002 | rmap_path.attr = &attr_tmp; | |
1003 | ||
1004 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1005 | ||
1006 | ret = route_map_apply(aggregate->rmap.map, p, RMAP_BGP, | |
1007 | &rmap_path); | |
1008 | ||
1009 | bgp->peer_self->rmap_type = 0; | |
1010 | ||
1011 | if (ret == RMAP_DENYMATCH) { | |
1012 | /* Free uninterned attribute. */ | |
1013 | bgp_attr_flush(&attr_tmp); | |
1014 | ||
1015 | /* Unintern original. */ | |
1016 | aspath_unintern(&attr.aspath); | |
1017 | return NULL; | |
1018 | } | |
1019 | ||
637e5ba4 | 1020 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1021 | bgp_attr_add_gshut_community(&attr_tmp); |
1022 | ||
1023 | new = bgp_attr_intern(&attr_tmp); | |
1024 | } else { | |
1025 | ||
637e5ba4 | 1026 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1027 | bgp_attr_add_gshut_community(&attr); |
1028 | ||
1029 | new = bgp_attr_intern(&attr); | |
1030 | } | |
d62a17ae | 1031 | |
1032 | aspath_unintern(&new->aspath); | |
1033 | return new; | |
718e3744 | 1034 | } |
1035 | ||
b881c707 | 1036 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1037 | void bgp_attr_unintern_sub(struct attr *attr) |
1038 | { | |
1039 | /* aspath refcount shoud be decrement. */ | |
1040 | if (attr->aspath) | |
1041 | aspath_unintern(&attr->aspath); | |
1042 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
1043 | ||
1044 | if (attr->community) | |
1045 | community_unintern(&attr->community); | |
1046 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
1047 | ||
1048 | if (attr->ecommunity) | |
1049 | ecommunity_unintern(&attr->ecommunity); | |
1050 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
1051 | ||
9a659715 PG |
1052 | if (attr->ipv6_ecommunity) |
1053 | ecommunity_unintern(&attr->ipv6_ecommunity); | |
1054 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES)); | |
1055 | ||
d62a17ae | 1056 | if (attr->lcommunity) |
1057 | lcommunity_unintern(&attr->lcommunity); | |
1058 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
1059 | ||
1060 | if (attr->cluster) | |
628565c7 | 1061 | cluster_unintern(&attr->cluster); |
d62a17ae | 1062 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1063 | ||
1064 | if (attr->transit) | |
547357c4 | 1065 | transit_unintern(&attr->transit); |
d62a17ae | 1066 | |
1067 | if (attr->encap_subtlvs) | |
1068 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1069 | |
1e20238a | 1070 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 1071 | if (attr->vnc_subtlvs) |
1072 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 1073 | #endif |
e496b420 HS |
1074 | |
1075 | if (attr->srv6_l3vpn) | |
1076 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1077 | ||
1078 | if (attr->srv6_vpn) | |
1079 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1080 | } |
1081 | ||
f46d8e1e DS |
1082 | /* |
1083 | * We have some show commands that let you experimentally | |
1084 | * apply a route-map. When we apply the route-map | |
1085 | * we are reseting values but not saving them for | |
1086 | * posterity via intern'ing( because route-maps don't | |
1087 | * do that) but at this point in time we need | |
1088 | * to compare the new attr to the old and if the | |
1089 | * routemap has changed it we need to, as Snoop Dog says, | |
1090 | * Drop it like it's hot | |
1091 | */ | |
1092 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
1093 | { | |
1094 | if (new->aspath != old->aspath) | |
1095 | aspath_free(new->aspath); | |
1096 | ||
1097 | if (new->community != old->community) | |
3c1f53de | 1098 | community_free(&new->community); |
f46d8e1e DS |
1099 | |
1100 | if (new->ecommunity != old->ecommunity) | |
1101 | ecommunity_free(&new->ecommunity); | |
1102 | ||
1103 | if (new->lcommunity != old->lcommunity) | |
1104 | lcommunity_free(&new->lcommunity); | |
f46d8e1e DS |
1105 | } |
1106 | ||
718e3744 | 1107 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1108 | void bgp_attr_unintern(struct attr **pattr) |
1109 | { | |
1110 | struct attr *attr = *pattr; | |
1111 | struct attr *ret; | |
1112 | struct attr tmp; | |
1113 | ||
1114 | /* Decrement attribute reference. */ | |
1115 | attr->refcnt--; | |
1116 | ||
1117 | tmp = *attr; | |
1118 | ||
1119 | /* If reference becomes zero then free attribute object. */ | |
1120 | if (attr->refcnt == 0) { | |
1121 | ret = hash_release(attrhash, attr); | |
1122 | assert(ret != NULL); | |
1123 | XFREE(MTYPE_ATTR, attr); | |
1124 | *pattr = NULL; | |
1125 | } | |
1126 | ||
1127 | bgp_attr_unintern_sub(&tmp); | |
1128 | } | |
1129 | ||
1130 | void bgp_attr_flush(struct attr *attr) | |
1131 | { | |
1132 | if (attr->aspath && !attr->aspath->refcnt) { | |
1133 | aspath_free(attr->aspath); | |
1134 | attr->aspath = NULL; | |
1135 | } | |
3c1f53de SMS |
1136 | if (attr->community && !attr->community->refcnt) |
1137 | community_free(&attr->community); | |
d62a17ae | 1138 | if (attr->ecommunity && !attr->ecommunity->refcnt) |
1139 | ecommunity_free(&attr->ecommunity); | |
9a659715 PG |
1140 | if (attr->ipv6_ecommunity && !attr->ipv6_ecommunity->refcnt) |
1141 | ecommunity_free(&attr->ipv6_ecommunity); | |
d62a17ae | 1142 | if (attr->lcommunity && !attr->lcommunity->refcnt) |
1143 | lcommunity_free(&attr->lcommunity); | |
1144 | if (attr->cluster && !attr->cluster->refcnt) { | |
1145 | cluster_free(attr->cluster); | |
1146 | attr->cluster = NULL; | |
1147 | } | |
1148 | if (attr->transit && !attr->transit->refcnt) { | |
1149 | transit_free(attr->transit); | |
1150 | attr->transit = NULL; | |
1151 | } | |
1152 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1153 | encap_free(attr->encap_subtlvs); | |
1154 | attr->encap_subtlvs = NULL; | |
1155 | } | |
1e20238a | 1156 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 1157 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
1158 | encap_free(attr->vnc_subtlvs); | |
1159 | attr->vnc_subtlvs = NULL; | |
1160 | } | |
aadc0905 | 1161 | #endif |
718e3744 | 1162 | } |
1163 | ||
b881c707 PJ |
1164 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1165 | * avoid resetting sessions for malformed attributes which are | |
1166 | * are partial/optional and hence where the error likely was not | |
1167 | * introduced by the sending neighbour. | |
1168 | */ | |
1169 | static bgp_attr_parse_ret_t | |
d7c0a89a | 1170 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1171 | bgp_size_t length) |
1172 | { | |
1173 | struct peer *const peer = args->peer; | |
599f7b33 | 1174 | struct attr *const attr = args->attr; |
d7c0a89a | 1175 | const uint8_t flags = args->flags; |
d62a17ae | 1176 | /* startp and length must be special-cased, as whether or not to |
1177 | * send the attribute data with the NOTIFY depends on the error, | |
1178 | * the caller therefore signals this with the seperate length argument | |
1179 | */ | |
d7c0a89a | 1180 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1181 | |
599f7b33 DA |
1182 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1183 | char attr_str[BUFSIZ] = {0}; | |
1184 | ||
99ab4d23 | 1185 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1186 | |
1187 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1188 | } | |
1189 | ||
d62a17ae | 1190 | /* Only relax error handling for eBGP peers */ |
1191 | if (peer->sort != BGP_PEER_EBGP) { | |
1192 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1193 | notify_datap, length); | |
1194 | return BGP_ATTR_PARSE_ERROR; | |
1195 | } | |
1196 | ||
1197 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1198 | * still proceed but the caller hasn't read all the attribute. | |
1199 | */ | |
1200 | stream_set_getp(BGP_INPUT(peer), | |
1201 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1202 | + args->total); | |
1203 | ||
1204 | switch (args->type) { | |
1205 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1206 | * affect route selection, and can be safely ignored, then any such | |
1207 | * attributes which are malformed should just be ignored and the route | |
1208 | * processed as normal. | |
1209 | */ | |
1210 | case BGP_ATTR_AS4_AGGREGATOR: | |
1211 | case BGP_ATTR_AGGREGATOR: | |
1212 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1213 | return BGP_ATTR_PARSE_PROCEED; | |
1214 | ||
1215 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1216 | * selection, should be treat-as-withdraw. |
d62a17ae | 1217 | */ |
1218 | case BGP_ATTR_ORIGIN: | |
1219 | case BGP_ATTR_AS_PATH: | |
1220 | case BGP_ATTR_NEXT_HOP: | |
1221 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1222 | case BGP_ATTR_LOCAL_PREF: | |
1223 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1224 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1225 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1226 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1227 | case BGP_ATTR_ORIGINATOR_ID: |
1228 | case BGP_ATTR_CLUSTER_LIST: | |
4ba5a9c5 | 1229 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1230 | case BGP_ATTR_MP_REACH_NLRI: |
1231 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1232 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1233 | notify_datap, length); | |
1234 | return BGP_ATTR_PARSE_ERROR; | |
1235 | } | |
1236 | ||
1237 | /* Partial optional attributes that are malformed should not cause | |
1238 | * the whole session to be reset. Instead treat it as a withdrawal | |
1239 | * of the routes, if possible. | |
1240 | */ | |
1241 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1242 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1243 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1244 | return BGP_ATTR_PARSE_WITHDRAW; | |
1245 | ||
1246 | /* default to reset */ | |
1247 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1248 | } |
1249 | ||
afcb7679 DO |
1250 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1251 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1252 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1253 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1254 | non-transitive" attribute. */ | |
1255 | static void | |
d62a17ae | 1256 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1257 | uint8_t desired_flags /* how RFC says it must be */ |
1258 | ) | |
d62a17ae | 1259 | { |
d7c0a89a QY |
1260 | uint8_t seen = 0, i; |
1261 | uint8_t real_flags = args->flags; | |
1262 | const uint8_t attr_code = args->type; | |
d62a17ae | 1263 | |
1264 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1265 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1266 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1267 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1268 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1269 | flog_err(EC_BGP_ATTR_FLAG, |
1270 | "%s attribute must%s be flagged as \"%s\"", | |
1271 | lookup_msg(attr_str, attr_code, NULL), | |
1272 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1273 | ? "" | |
1274 | : " not", | |
1275 | attr_flag_str[i].str); | |
d62a17ae | 1276 | seen = 1; |
1277 | } | |
1278 | if (!seen) { | |
1279 | zlog_debug( | |
3efd0893 | 1280 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1281 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1282 | real_flags, desired_flags); | |
1283 | } | |
afcb7679 DO |
1284 | } |
1285 | ||
3ecab4c8 PJ |
1286 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1287 | * as will PARTIAL for optional+transitive attributes. | |
1288 | */ | |
d7c0a89a QY |
1289 | const uint8_t attr_flags_values[] = { |
1290 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1291 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1292 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1293 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1294 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1295 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1296 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1297 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1298 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1299 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1300 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1301 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1302 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1303 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1304 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1305 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1306 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1307 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1308 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1309 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1310 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
9a659715 PG |
1311 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1312 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1313 | }; |
099111ef | 1314 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1315 | |
3dc339cd | 1316 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1317 | { |
d7c0a89a QY |
1318 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1319 | const uint8_t flags = args->flags; | |
1320 | const uint8_t attr_code = args->type; | |
d62a17ae | 1321 | |
1322 | /* there may be attributes we don't know about */ | |
1323 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1324 | return false; |
d62a17ae | 1325 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1326 | return false; |
d62a17ae | 1327 | |
1328 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1329 | * to | |
1330 | * 1." | |
1331 | */ | |
1332 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1333 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1334 | flog_err( |
e50f7cfd | 1335 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1336 | "%s well-known attributes must have transitive flag set (%x)", |
1337 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1338 | return true; |
d62a17ae | 1339 | } |
1340 | ||
1341 | /* "For well-known attributes and for optional non-transitive | |
1342 | * attributes, | |
1343 | * the Partial bit MUST be set to 0." | |
1344 | */ | |
1345 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1346 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1347 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1348 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1349 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1350 | return true; |
d62a17ae | 1351 | } |
1352 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1353 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1354 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1355 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1356 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1357 | return true; |
d62a17ae | 1358 | } |
1359 | } | |
1360 | ||
1361 | /* Optional transitive attributes may go through speakers that don't | |
1362 | * reocgnise them and set the Partial bit. | |
1363 | */ | |
1364 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1365 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1366 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1367 | ||
1368 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1369 | return false; |
d62a17ae | 1370 | |
1371 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1372 | return true; |
3ecab4c8 PJ |
1373 | } |
1374 | ||
718e3744 | 1375 | /* Get origin attribute of the update message. */ |
d62a17ae | 1376 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1377 | { | |
1378 | struct peer *const peer = args->peer; | |
1379 | struct attr *const attr = args->attr; | |
1380 | const bgp_size_t length = args->length; | |
1381 | ||
1382 | /* If any recognized attribute has Attribute Length that conflicts | |
1383 | with the expected length (based on the attribute type code), then | |
1384 | the Error Subcode is set to Attribute Length Error. The Data | |
1385 | field contains the erroneous attribute (type, length and | |
1386 | value). */ | |
1387 | if (length != 1) { | |
e50f7cfd | 1388 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1389 | "Origin attribute length is not one %d", length); |
d62a17ae | 1390 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1391 | args->total); | |
1392 | } | |
1393 | ||
1394 | /* Fetch origin attribute. */ | |
1395 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1396 | ||
1397 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1398 | Subcode is set to Invalid Origin Attribute. The Data field | |
1399 | contains the unrecognized attribute (type, length and value). */ | |
1400 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1401 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1402 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1403 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1404 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1405 | args->total); | |
1406 | } | |
1407 | ||
1408 | /* Set oring attribute flag. */ | |
1409 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1410 | ||
1411 | return 0; | |
718e3744 | 1412 | } |
ab005298 PJ |
1413 | |
1414 | /* Parse AS path information. This function is wrapper of | |
1415 | aspath_parse. */ | |
d62a17ae | 1416 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1417 | { | |
1418 | struct attr *const attr = args->attr; | |
1419 | struct peer *const peer = args->peer; | |
1420 | const bgp_size_t length = args->length; | |
1421 | ||
1422 | /* | |
1423 | * peer with AS4 => will get 4Byte ASnums | |
1424 | * otherwise, will get 16 Bit | |
1425 | */ | |
424ab01d | 1426 | attr->aspath = aspath_parse(peer->curr, length, |
d62a17ae | 1427 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); |
1428 | ||
1429 | /* In case of IBGP, length will be zero. */ | |
1430 | if (!attr->aspath) { | |
e50f7cfd | 1431 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1432 | "Malformed AS path from %s, length is %d", peer->host, |
1433 | length); | |
d62a17ae | 1434 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1435 | 0); | |
1436 | } | |
0b2aa3a0 | 1437 | |
33d022bc DA |
1438 | /* Codification of AS 0 Processing */ |
1439 | if (aspath_check_as_zero(attr->aspath)) { | |
6ded3e18 DA |
1440 | flog_err( |
1441 | EC_BGP_ATTR_MAL_AS_PATH, | |
1442 | "Malformed AS path, AS number is 0 in the path from %s", | |
1443 | peer->host); | |
33d022bc DA |
1444 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1445 | 0); | |
1446 | } | |
1447 | ||
d62a17ae | 1448 | /* Set aspath attribute flag. */ |
1449 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1450 | ||
1451 | return BGP_ATTR_PARSE_PROCEED; | |
1452 | } | |
1453 | ||
1454 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1455 | struct attr *const attr) | |
1456 | { | |
1457 | /* These checks were part of bgp_attr_aspath, but with | |
1458 | * as4 we should to check aspath things when | |
1459 | * aspath synthesizing with as4_path has already taken place. | |
1460 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1461 | * not right. | |
1462 | * So do the checks later, i.e. here | |
1463 | */ | |
d62a17ae | 1464 | struct aspath *aspath; |
1465 | ||
1466 | /* Confederation sanity check. */ | |
1467 | if ((peer->sort == BGP_PEER_CONFED | |
1468 | && !aspath_left_confed_check(attr->aspath)) | |
1469 | || (peer->sort == BGP_PEER_EBGP | |
1470 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1471 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1472 | peer->host); |
4ba5a9c5 | 1473 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1474 | } |
cddb8112 | 1475 | |
d62a17ae | 1476 | /* First AS check for EBGP. */ |
47cbc09b | 1477 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1478 | if (peer->sort == BGP_PEER_EBGP |
1479 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1480 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1481 | "%s incorrect first AS (must be %u)", |
1482 | peer->host, peer->as); | |
4ba5a9c5 | 1483 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1484 | } |
1485 | } | |
0b2aa3a0 | 1486 | |
d62a17ae | 1487 | /* local-as prepend */ |
1488 | if (peer->change_local_as | |
1489 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1490 | aspath = aspath_dup(attr->aspath); | |
1491 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1492 | aspath_unintern(&attr->aspath); | |
1493 | attr->aspath = aspath_intern(aspath); | |
1494 | } | |
0b2aa3a0 | 1495 | |
d62a17ae | 1496 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1497 | } |
1498 | ||
ab005298 PJ |
1499 | /* Parse AS4 path information. This function is another wrapper of |
1500 | aspath_parse. */ | |
d62a17ae | 1501 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1502 | struct aspath **as4_path) | |
ab005298 | 1503 | { |
d62a17ae | 1504 | struct peer *const peer = args->peer; |
1505 | struct attr *const attr = args->attr; | |
1506 | const bgp_size_t length = args->length; | |
ab005298 | 1507 | |
424ab01d | 1508 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1509 | |
d62a17ae | 1510 | /* In case of IBGP, length will be zero. */ |
1511 | if (!*as4_path) { | |
e50f7cfd | 1512 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1513 | "Malformed AS4 path from %s, length is %d", peer->host, |
1514 | length); | |
d62a17ae | 1515 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1516 | 0); | |
1517 | } | |
ab005298 | 1518 | |
33d022bc DA |
1519 | /* Codification of AS 0 Processing */ |
1520 | if (aspath_check_as_zero(*as4_path)) { | |
6ded3e18 DA |
1521 | flog_err( |
1522 | EC_BGP_ATTR_MAL_AS_PATH, | |
1523 | "Malformed AS path, AS number is 0 in the path from %s", | |
1524 | peer->host); | |
33d022bc DA |
1525 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1526 | 0); | |
1527 | } | |
1528 | ||
d62a17ae | 1529 | /* Set aspath attribute flag. */ |
1530 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1531 | ||
1532 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1533 | } |
1534 | ||
9738e9aa | 1535 | /* |
1536 | * Check that the nexthop attribute is valid. | |
1537 | */ | |
1538 | bgp_attr_parse_ret_t | |
1539 | bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr) | |
1540 | { | |
1541 | in_addr_t nexthop_h; | |
1542 | ||
1543 | nexthop_h = ntohl(attr->nexthop.s_addr); | |
1544 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1545 | || IPV4_CLASS_DE(nexthop_h)) | |
1546 | && !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) { | |
7decb30c | 1547 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1548 | char buf[INET_ADDRSTRLEN]; |
1549 | ||
1550 | inet_ntop(AF_INET, &attr->nexthop.s_addr, buf, | |
1551 | INET_ADDRSTRLEN); | |
1552 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", | |
1553 | buf); | |
7decb30c DS |
1554 | data[0] = BGP_ATTR_FLAG_TRANS; |
1555 | data[1] = BGP_ATTR_NEXT_HOP; | |
1556 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1557 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1558 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1559 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1560 | data, 7); | |
9738e9aa | 1561 | return BGP_ATTR_PARSE_ERROR; |
1562 | } | |
1563 | ||
1564 | return BGP_ATTR_PARSE_PROCEED; | |
1565 | } | |
1566 | ||
718e3744 | 1567 | /* Nexthop attribute. */ |
d62a17ae | 1568 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1569 | { | |
1570 | struct peer *const peer = args->peer; | |
1571 | struct attr *const attr = args->attr; | |
1572 | const bgp_size_t length = args->length; | |
1573 | ||
d62a17ae | 1574 | /* Check nexthop attribute length. */ |
1575 | if (length != 4) { | |
e50f7cfd | 1576 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1577 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1578 | |
1579 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1580 | args->total); | |
1581 | } | |
1582 | ||
88f33d66 | 1583 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1584 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1585 | ||
1586 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1587 | } |
1588 | ||
1589 | /* MED atrribute. */ | |
d62a17ae | 1590 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1591 | { |
d62a17ae | 1592 | struct peer *const peer = args->peer; |
1593 | struct attr *const attr = args->attr; | |
1594 | const bgp_size_t length = args->length; | |
b881c707 | 1595 | |
d62a17ae | 1596 | /* Length check. */ |
1597 | if (length != 4) { | |
e50f7cfd | 1598 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1599 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1600 | |
d62a17ae | 1601 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1602 | args->total); | |
1603 | } | |
1604 | ||
424ab01d | 1605 | attr->med = stream_getl(peer->curr); |
718e3744 | 1606 | |
d62a17ae | 1607 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1608 | |
d62a17ae | 1609 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1610 | } |
1611 | ||
1612 | /* Local preference attribute. */ | |
b881c707 | 1613 | static bgp_attr_parse_ret_t |
d62a17ae | 1614 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1615 | { | |
1616 | struct peer *const peer = args->peer; | |
1617 | struct attr *const attr = args->attr; | |
1618 | const bgp_size_t length = args->length; | |
1619 | ||
4ba5a9c5 DA |
1620 | /* if received from an internal neighbor, it SHALL be considered |
1621 | * malformed if its length is not equal to 4. If malformed, the | |
1622 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1623 | * withdraw". | |
1624 | */ | |
1625 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1626 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1627 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1628 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1629 | args->total); | |
1630 | } | |
1631 | ||
1632 | /* If it is contained in an UPDATE message that is received from an | |
1633 | external peer, then this attribute MUST be ignored by the | |
1634 | receiving speaker. */ | |
1635 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1636 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1637 | return BGP_ATTR_PARSE_PROCEED; |
1638 | } | |
1639 | ||
ad61f778 | 1640 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1641 | |
7f323236 | 1642 | /* Set the local-pref flag. */ |
d62a17ae | 1643 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1644 | ||
1645 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1646 | |
1647 | stream_failure: | |
1648 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1649 | args->total); | |
718e3744 | 1650 | } |
1651 | ||
1652 | /* Atomic aggregate. */ | |
d62a17ae | 1653 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1654 | { |
d62a17ae | 1655 | struct attr *const attr = args->attr; |
1656 | const bgp_size_t length = args->length; | |
1657 | ||
1658 | /* Length check. */ | |
1659 | if (length != 0) { | |
e50f7cfd | 1660 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1661 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1662 | length); | |
d62a17ae | 1663 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1664 | args->total); | |
1665 | } | |
718e3744 | 1666 | |
d62a17ae | 1667 | /* Set atomic aggregate flag. */ |
1668 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1669 | |
d62a17ae | 1670 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1671 | } |
1672 | ||
1673 | /* Aggregator attribute */ | |
d62a17ae | 1674 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1675 | { | |
1676 | struct peer *const peer = args->peer; | |
1677 | struct attr *const attr = args->attr; | |
1678 | const bgp_size_t length = args->length; | |
33d022bc | 1679 | as_t aggregator_as; |
d62a17ae | 1680 | |
1681 | int wantedlen = 6; | |
1682 | ||
1683 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1684 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1685 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1686 | wantedlen = 8; |
1687 | ||
1688 | if (length != wantedlen) { | |
e50f7cfd | 1689 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1690 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1691 | length); | |
d62a17ae | 1692 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1693 | args->total); | |
1694 | } | |
1695 | ||
1696 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
33d022bc | 1697 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1698 | else |
33d022bc DA |
1699 | aggregator_as = stream_getw(peer->curr); |
1700 | ||
0f2a703d DA |
1701 | attr->aggregator_as = aggregator_as; |
1702 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1703 | ||
1704 | /* Set atomic aggregate flag. */ | |
1705 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1706 | ||
33d022bc | 1707 | /* Codification of AS 0 Processing */ |
cbfc39df | 1708 | if (aggregator_as == BGP_AS_ZERO) |
33d022bc | 1709 | flog_err(EC_BGP_ATTR_LEN, |
0f2a703d DA |
1710 | "AGGREGATOR AS number is 0 for aspath: %s", |
1711 | aspath_print(attr->aspath)); | |
33d022bc | 1712 | |
d62a17ae | 1713 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1714 | } |
1715 | ||
0b2aa3a0 | 1716 | /* New Aggregator attribute */ |
b881c707 | 1717 | static bgp_attr_parse_ret_t |
d62a17ae | 1718 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1719 | as_t *as4_aggregator_as, | |
1720 | struct in_addr *as4_aggregator_addr) | |
1721 | { | |
1722 | struct peer *const peer = args->peer; | |
1723 | struct attr *const attr = args->attr; | |
1724 | const bgp_size_t length = args->length; | |
33d022bc | 1725 | as_t aggregator_as; |
d62a17ae | 1726 | |
1727 | if (length != 8) { | |
1c50c1c0 QY |
1728 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1729 | length); | |
d62a17ae | 1730 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1731 | 0); | |
1732 | } | |
1733 | ||
33d022bc | 1734 | aggregator_as = stream_getl(peer->curr); |
0f2a703d DA |
1735 | *as4_aggregator_as = aggregator_as; |
1736 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1737 | ||
1738 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1739 | ||
1740 | /* Codification of AS 0 Processing */ | |
cbfc39df | 1741 | if (aggregator_as == BGP_AS_ZERO) |
33d022bc | 1742 | flog_err(EC_BGP_ATTR_LEN, |
0f2a703d DA |
1743 | "AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1744 | aspath_print(attr->aspath)); | |
33d022bc | 1745 | |
d62a17ae | 1746 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1747 | } |
1748 | ||
1749 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1750 | */ | |
b881c707 | 1751 | static bgp_attr_parse_ret_t |
d62a17ae | 1752 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1753 | struct aspath *as4_path, as_t as4_aggregator, | |
1754 | struct in_addr *as4_aggregator_addr) | |
1755 | { | |
1756 | int ignore_as4_path = 0; | |
1757 | struct aspath *newpath; | |
1758 | ||
1759 | if (!attr->aspath) { | |
1760 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1761 | * have | |
1762 | * checked that all well-known, mandatory attributes were | |
1763 | * present. | |
1764 | * | |
1765 | * Can only be a problem with peer itself - hard error | |
1766 | */ | |
1767 | return BGP_ATTR_PARSE_ERROR; | |
1768 | } | |
1769 | ||
1770 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1771 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1772 | * if given. | |
1773 | * It is worth a warning though, because the peer really | |
1774 | * should not send them | |
1775 | */ | |
1776 | if (BGP_DEBUG(as4, AS4)) { | |
1777 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1778 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1779 | "AS4 capable peer, yet it sent"); | |
1780 | ||
1781 | if (attr->flag | |
1782 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1783 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1784 | peer->host, | |
1785 | "AS4 capable peer, yet it sent"); | |
1786 | } | |
1787 | ||
1788 | return BGP_ATTR_PARSE_PROCEED; | |
1789 | } | |
1790 | ||
1791 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1792 | * because that may override AS4_PATH | |
1793 | */ | |
1794 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1795 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1796 | /* received both. | |
1797 | * if the as_number in aggregator is not AS_TRANS, | |
1798 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1799 | * and the Aggregator shall be taken as | |
1800 | * info on the aggregating node, and the AS_PATH | |
1801 | * shall be taken as the AS_PATH | |
1802 | * otherwise | |
1803 | * the Aggregator shall be ignored and the | |
1804 | * AS4_AGGREGATOR shall be taken as the | |
1805 | * Aggregating node and the AS_PATH is to be | |
1806 | * constructed "as in all other cases" | |
1807 | */ | |
1808 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1809 | /* ignore */ | |
1810 | if (BGP_DEBUG(as4, AS4)) | |
1811 | zlog_debug( | |
3efd0893 | 1812 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 1813 | peer->host); |
1814 | ignore_as4_path = 1; | |
1815 | } else { | |
1816 | /* "New_aggregator shall be taken as aggregator" | |
1817 | */ | |
1818 | attr->aggregator_as = as4_aggregator; | |
1819 | attr->aggregator_addr.s_addr = | |
1820 | as4_aggregator_addr->s_addr; | |
1821 | } | |
1822 | } else { | |
1823 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1824 | * That is bogus - but reading the conditions | |
1825 | * we have to handle AS4_AGGREGATOR as if it were | |
1826 | * AGGREGATOR in that case | |
1827 | */ | |
1828 | if (BGP_DEBUG(as4, AS4)) | |
1829 | zlog_debug( | |
3efd0893 | 1830 | "[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 | 1831 | peer->host); |
1832 | attr->aggregator_as = as4_aggregator; | |
1833 | /* sweep it under the carpet and simulate a "good" | |
1834 | * AGGREGATOR */ | |
1835 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1840 | if (!ignore_as4_path | |
1841 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1842 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1843 | if (!newpath) |
1844 | return BGP_ATTR_PARSE_ERROR; | |
1845 | ||
d62a17ae | 1846 | aspath_unintern(&attr->aspath); |
1847 | attr->aspath = aspath_intern(newpath); | |
1848 | } | |
1849 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1850 | } |
1851 | ||
718e3744 | 1852 | /* Community attribute. */ |
b881c707 | 1853 | static bgp_attr_parse_ret_t |
d62a17ae | 1854 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1855 | { | |
1856 | struct peer *const peer = args->peer; | |
1857 | struct attr *const attr = args->attr; | |
1858 | const bgp_size_t length = args->length; | |
1859 | ||
1860 | if (length == 0) { | |
1861 | attr->community = NULL; | |
6680b550 DA |
1862 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
1863 | args->total); | |
d62a17ae | 1864 | } |
1865 | ||
1866 | attr->community = | |
d7c0a89a | 1867 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1868 | |
1869 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1870 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1871 | |
4ba5a9c5 DA |
1872 | /* The Community attribute SHALL be considered malformed if its |
1873 | * length is not a non-zero multiple of 4. | |
1874 | */ | |
d62a17ae | 1875 | if (!attr->community) |
1876 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1877 | args->total); | |
1878 | ||
1879 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1880 | ||
1881 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1882 | } |
1883 | ||
1884 | /* Originator ID attribute. */ | |
b881c707 | 1885 | static bgp_attr_parse_ret_t |
d62a17ae | 1886 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1887 | { |
d62a17ae | 1888 | struct peer *const peer = args->peer; |
1889 | struct attr *const attr = args->attr; | |
1890 | const bgp_size_t length = args->length; | |
718e3744 | 1891 | |
4ba5a9c5 DA |
1892 | /* if received from an internal neighbor, it SHALL be considered |
1893 | * malformed if its length is not equal to 4. If malformed, the | |
1894 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1895 | * withdraw". | |
1896 | */ | |
d62a17ae | 1897 | if (length != 4) { |
e50f7cfd | 1898 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 1899 | length); |
718e3744 | 1900 | |
d62a17ae | 1901 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1902 | args->total); | |
1903 | } | |
1904 | ||
424ab01d | 1905 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1906 | |
d62a17ae | 1907 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1908 | |
d62a17ae | 1909 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1910 | } |
1911 | ||
1912 | /* Cluster list attribute. */ | |
b881c707 | 1913 | static bgp_attr_parse_ret_t |
d62a17ae | 1914 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1915 | { |
d62a17ae | 1916 | struct peer *const peer = args->peer; |
1917 | struct attr *const attr = args->attr; | |
1918 | const bgp_size_t length = args->length; | |
1919 | ||
4ba5a9c5 DA |
1920 | /* if received from an internal neighbor, it SHALL be considered |
1921 | * malformed if its length is not a non-zero multiple of 4. If | |
1922 | * malformed, the UPDATE message SHALL be handled using the approach | |
1923 | * of "treat-as-withdraw". | |
1924 | */ | |
33ba22c2 | 1925 | if (length == 0 || length % 4) { |
1c50c1c0 | 1926 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 1927 | |
d62a17ae | 1928 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1929 | args->total); | |
1930 | } | |
1931 | ||
1932 | attr->cluster = | |
424ab01d | 1933 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); |
718e3744 | 1934 | |
d62a17ae | 1935 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 1936 | stream_forward_getp(peer->curr, length); |
718e3744 | 1937 | |
d62a17ae | 1938 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1939 | |
d62a17ae | 1940 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1941 | } |
1942 | ||
1943 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1944 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1945 | struct bgp_nlri *mp_update) | |
1946 | { | |
1947 | iana_afi_t pkt_afi; | |
1948 | afi_t afi; | |
5c525538 RW |
1949 | iana_safi_t pkt_safi; |
1950 | safi_t safi; | |
d62a17ae | 1951 | bgp_size_t nlri_len; |
1952 | size_t start; | |
1953 | struct stream *s; | |
1954 | struct peer *const peer = args->peer; | |
1955 | struct attr *const attr = args->attr; | |
1956 | const bgp_size_t length = args->length; | |
1957 | ||
1958 | /* Set end of packet. */ | |
1959 | s = BGP_INPUT(peer); | |
1960 | start = stream_get_getp(s); | |
1961 | ||
1962 | /* safe to read statically sized header? */ | |
6e4ab12f | 1963 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1964 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1965 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
1966 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
1967 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 1968 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
1969 | } | |
1970 | ||
1971 | /* Load AFI, SAFI. */ | |
1972 | pkt_afi = stream_getw(s); | |
1973 | pkt_safi = stream_getc(s); | |
1974 | ||
1975 | /* Convert AFI, SAFI to internal values, check. */ | |
1976 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1977 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1978 | * unless | |
1979 | * the attribute is otherwise malformed. | |
1980 | */ | |
1981 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1982 | zlog_debug( | |
4cb5e18b | 1983 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
1984 | peer->host, iana_afi2str(pkt_afi), |
1985 | iana_safi2str(pkt_safi)); | |
d62a17ae | 1986 | return BGP_ATTR_PARSE_ERROR; |
1987 | } | |
1988 | ||
1989 | /* Get nexthop length. */ | |
1990 | attr->mp_nexthop_len = stream_getc(s); | |
1991 | ||
1992 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1993 | zlog_info( | |
4cb5e18b | 1994 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 1995 | __func__, peer->host, attr->mp_nexthop_len); |
1996 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1997 | } | |
1998 | ||
1999 | /* Nexthop length check. */ | |
2000 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2001 | case 0: |
2002 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2003 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2004 | __func__, peer->host, attr->mp_nexthop_len); |
2005 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2006 | } | |
2007 | break; | |
b6453163 LB |
2008 | case BGP_ATTR_NHLEN_VPNV4: |
2009 | stream_getl(s); /* RD high */ | |
2010 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2011 | /* |
2012 | * NOTE: intentional fall through | |
2013 | * - for consistency in rx processing | |
2014 | * | |
2015 | * The following comment is to signal GCC this intention | |
0437e105 | 2016 | * and suppress the warning |
996c9314 LB |
2017 | */ |
2018 | /* FALLTHRU */ | |
d62a17ae | 2019 | case BGP_ATTR_NHLEN_IPV4: |
2020 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2021 | /* Probably needed for RFC 2283 */ | |
975a328e | 2022 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2023 | memcpy(&attr->nexthop.s_addr, |
2024 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2025 | break; | |
d62a17ae | 2026 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2027 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2028 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2029 | stream_getl(s); /* RD high */ | |
2030 | stream_getl(s); /* RD low */ | |
2031 | } | |
2032 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2033 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2034 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2035 | 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 |
2036 | peer->host); |
2037 | return BGP_ATTR_PARSE_WITHDRAW; | |
2038 | } | |
77e62f2b | 2039 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2040 | } |
d62a17ae | 2041 | break; |
2042 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2043 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2044 | if (attr->mp_nexthop_len | |
2045 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2046 | stream_getl(s); /* RD high */ | |
2047 | stream_getl(s); /* RD low */ | |
2048 | } | |
2049 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2050 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2051 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2052 | 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 |
2053 | peer->host); |
2054 | return BGP_ATTR_PARSE_WITHDRAW; | |
2055 | } | |
77e62f2b | 2056 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2057 | } |
d62a17ae | 2058 | if (attr->mp_nexthop_len |
2059 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2060 | stream_getl(s); /* RD high */ | |
2061 | stream_getl(s); /* RD low */ | |
2062 | } | |
2063 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2064 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
2065 | char buf1[INET6_ADDRSTRLEN]; | |
2066 | char buf2[INET6_ADDRSTRLEN]; | |
2067 | ||
2068 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2069 | zlog_debug( | |
4cb5e18b | 2070 | "%s sent next-hops %s and %s. Ignoring non-LL value", |
d62a17ae | 2071 | peer->host, |
2072 | inet_ntop(AF_INET6, | |
2073 | &attr->mp_nexthop_global, | |
2074 | buf1, INET6_ADDRSTRLEN), | |
2075 | inet_ntop(AF_INET6, | |
2076 | &attr->mp_nexthop_local, buf2, | |
2077 | INET6_ADDRSTRLEN)); | |
2078 | ||
2079 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2080 | } | |
17cdd31e | 2081 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2082 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2083 | peer->host); |
2084 | return BGP_ATTR_PARSE_WITHDRAW; | |
2085 | } | |
77e62f2b | 2086 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2087 | break; |
2088 | default: | |
4cb5e18b | 2089 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2090 | __func__, peer->host, attr->mp_nexthop_len); |
2091 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2092 | } | |
2093 | ||
2094 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2095 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2096 | __func__, peer->host); | |
d62a17ae | 2097 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2098 | } | |
2099 | ||
718e3744 | 2100 | { |
d7c0a89a | 2101 | uint8_t val; |
d62a17ae | 2102 | if ((val = stream_getc(s))) |
ade6974d | 2103 | flog_warn( |
e50f7cfd | 2104 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2105 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2106 | peer->host, val); | |
d62a17ae | 2107 | } |
2108 | ||
2109 | /* must have nrli_len, what is left of the attribute */ | |
2110 | nlri_len = LEN_LEFT; | |
9b9df989 | 2111 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2112 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2113 | __func__, peer->host); | |
d62a17ae | 2114 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2115 | } | |
2116 | ||
9b9df989 | 2117 | if (!nlri_len) { |
4cb5e18b | 2118 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2119 | __func__, peer->host); |
2120 | ||
2121 | mp_update->afi = afi; | |
2122 | mp_update->safi = safi; | |
2123 | return BGP_ATTR_PARSE_EOR; | |
2124 | } | |
2125 | ||
d62a17ae | 2126 | mp_update->afi = afi; |
2127 | mp_update->safi = safi; | |
2128 | mp_update->nlri = stream_pnt(s); | |
2129 | mp_update->length = nlri_len; | |
2130 | ||
2131 | stream_forward_getp(s, nlri_len); | |
2132 | ||
2133 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2134 | ||
2135 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2136 | #undef LEN_LEFT |
718e3744 | 2137 | } |
2138 | ||
2139 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2140 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2141 | struct bgp_nlri *mp_withdraw) | |
2142 | { | |
2143 | struct stream *s; | |
2144 | iana_afi_t pkt_afi; | |
2145 | afi_t afi; | |
5c525538 RW |
2146 | iana_safi_t pkt_safi; |
2147 | safi_t safi; | |
d7c0a89a | 2148 | uint16_t withdraw_len; |
d62a17ae | 2149 | struct peer *const peer = args->peer; |
2150 | struct attr *const attr = args->attr; | |
2151 | const bgp_size_t length = args->length; | |
9cabb64b | 2152 | |
424ab01d | 2153 | s = peer->curr; |
9cabb64b | 2154 | |
d62a17ae | 2155 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2156 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2157 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2158 | ||
2159 | pkt_afi = stream_getw(s); | |
2160 | pkt_safi = stream_getc(s); | |
2161 | ||
2162 | /* Convert AFI, SAFI to internal values, check. */ | |
2163 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2164 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2165 | * unless | |
2166 | * the attribute is otherwise malformed. | |
2167 | */ | |
2168 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2169 | zlog_debug( | |
748a041f DS |
2170 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2171 | peer->host, iana_afi2str(pkt_afi), | |
2172 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2173 | return BGP_ATTR_PARSE_ERROR; |
2174 | } | |
718e3744 | 2175 | |
d62a17ae | 2176 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2177 | |
d62a17ae | 2178 | mp_withdraw->afi = afi; |
2179 | mp_withdraw->safi = safi; | |
2180 | mp_withdraw->nlri = stream_pnt(s); | |
2181 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2182 | |
d62a17ae | 2183 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2184 | |
d62a17ae | 2185 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2186 | ||
2187 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2188 | } |
2189 | ||
57d187bc JS |
2190 | /* Large Community attribute. */ |
2191 | static bgp_attr_parse_ret_t | |
d62a17ae | 2192 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2193 | { | |
2194 | struct peer *const peer = args->peer; | |
2195 | struct attr *const attr = args->attr; | |
2196 | const bgp_size_t length = args->length; | |
2197 | ||
2198 | /* | |
2199 | * Large community follows new attribute format. | |
2200 | */ | |
2201 | if (length == 0) { | |
2202 | attr->lcommunity = NULL; | |
2203 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2204 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2205 | args->total); | |
d62a17ae | 2206 | } |
57d187bc | 2207 | |
c4efd0f4 | 2208 | attr->lcommunity = lcommunity_parse(stream_pnt(peer->curr), length); |
d62a17ae | 2209 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2210 | stream_forward_getp(peer->curr, length); |
57d187bc | 2211 | |
d62a17ae | 2212 | if (!attr->lcommunity) |
2213 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2214 | args->total); | |
57d187bc | 2215 | |
d62a17ae | 2216 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 2217 | |
d62a17ae | 2218 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
2219 | } |
2220 | ||
718e3744 | 2221 | /* Extended Community attribute. */ |
b881c707 | 2222 | static bgp_attr_parse_ret_t |
d62a17ae | 2223 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2224 | { | |
2225 | struct peer *const peer = args->peer; | |
2226 | struct attr *const attr = args->attr; | |
2227 | const bgp_size_t length = args->length; | |
d7c0a89a | 2228 | uint8_t sticky = 0; |
7904e9fd | 2229 | bool proxy = false; |
d62a17ae | 2230 | |
2231 | if (length == 0) { | |
2232 | attr->ecommunity = NULL; | |
2233 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2234 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2235 | args->total); | |
d62a17ae | 2236 | } |
2237 | ||
2238 | attr->ecommunity = | |
c4efd0f4 | 2239 | ecommunity_parse(stream_pnt(peer->curr), length); |
d62a17ae | 2240 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2241 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2242 | |
4ba5a9c5 DA |
2243 | /* The Extended Community attribute SHALL be considered malformed if |
2244 | * its length is not a non-zero multiple of 8. | |
2245 | */ | |
d62a17ae | 2246 | if (!attr->ecommunity) |
2247 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2248 | args->total); | |
2249 | ||
2250 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
2251 | ||
74e2bd89 AK |
2252 | /* Extract DF election preference and mobility sequence number */ |
2253 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2254 | ||
d62a17ae | 2255 | /* Extract MAC mobility sequence number, if any. */ |
2256 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2257 | attr->sticky = sticky; | |
2258 | ||
ead40654 MK |
2259 | /* Check if this is a Gateway MAC-IP advertisement */ |
2260 | attr->default_gw = bgp_attr_default_gw(attr); | |
2261 | ||
68e33151 CS |
2262 | /* Handle scenario where router flag ecommunity is not |
2263 | * set but default gw ext community is present. | |
2264 | * Use default gateway, set and propogate R-bit. | |
2265 | */ | |
2266 | if (attr->default_gw) | |
2267 | attr->router_flag = 1; | |
2268 | ||
2269 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2270 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2271 | if (proxy) | |
2272 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2273 | |
bc59a672 | 2274 | /* Extract the Rmac, if any */ |
eee353c5 CS |
2275 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
2276 | if (bgp_debug_update(peer, NULL, NULL, 1) && | |
2277 | bgp_mac_exist(&attr->rmac)) { | |
2278 | char buf1[ETHER_ADDR_STRLEN]; | |
2279 | ||
2280 | zlog_debug("%s: router mac %s is self mac", | |
2281 | __func__, | |
2282 | prefix_mac2str(&attr->rmac, buf1, | |
2283 | sizeof(buf1))); | |
2284 | } | |
2285 | ||
2286 | } | |
bc59a672 | 2287 | |
f4bd90c5 LK |
2288 | /* Get the tunnel type from encap extended community */ |
2289 | bgp_attr_extcom_tunnel_type(attr, | |
2290 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2291 | ||
d901dc13 | 2292 | /* Extract link bandwidth, if any. */ |
2293 | (void)ecommunity_linkbw_present(attr->ecommunity, &attr->link_bw); | |
2294 | ||
d62a17ae | 2295 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2296 | } |
2297 | ||
9a659715 PG |
2298 | /* IPv6 Extended Community attribute. */ |
2299 | static bgp_attr_parse_ret_t | |
2300 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) | |
2301 | { | |
2302 | struct peer *const peer = args->peer; | |
2303 | struct attr *const attr = args->attr; | |
2304 | const bgp_size_t length = args->length; | |
2305 | ||
2306 | if (length == 0) { | |
2307 | attr->ipv6_ecommunity = NULL; | |
c6423c31 PG |
2308 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2309 | args->total); | |
9a659715 PG |
2310 | } |
2311 | ||
2312 | attr->ipv6_ecommunity = | |
c6423c31 | 2313 | ecommunity_parse_ipv6(stream_pnt(peer->curr), length); |
9a659715 PG |
2314 | /* XXX: fix ecommunity_parse to use stream API */ |
2315 | stream_forward_getp(peer->curr, length); | |
2316 | ||
2317 | if (!attr->ipv6_ecommunity) | |
2318 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2319 | args->total); | |
2320 | ||
2321 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES); | |
2322 | ||
2323 | return BGP_ATTR_PARSE_PROCEED; | |
2324 | } | |
2325 | ||
f4c89855 | 2326 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2327 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2328 | bgp_size_t length, /* IN: attr's length field */ | |
2329 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2330 | uint8_t flag, /* IN: attr's flags field */ |
2331 | uint8_t *startp) | |
d62a17ae | 2332 | { |
2333 | bgp_size_t total; | |
d62a17ae | 2334 | uint16_t tunneltype = 0; |
2335 | ||
2336 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2337 | ||
2338 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2339 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2340 | zlog_info( | |
2341 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2342 | flag); | |
2343 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2344 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2345 | startp, total); | |
2346 | return -1; | |
2347 | } | |
2348 | ||
2349 | if (BGP_ATTR_ENCAP == type) { | |
2350 | /* read outer TLV type and length */ | |
2351 | uint16_t tlv_length; | |
2352 | ||
2353 | if (length < 4) { | |
2354 | zlog_info( | |
2355 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2356 | bgp_notify_send_with_data( | |
2357 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2358 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2359 | return -1; | |
2360 | } | |
2361 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2362 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2363 | length -= 4; | |
2364 | ||
2365 | if (tlv_length != length) { | |
4cb5e18b NT |
2366 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2367 | __func__, tlv_length, length); | |
d62a17ae | 2368 | } |
2369 | } | |
2370 | ||
2371 | while (length >= 4) { | |
2372 | uint16_t subtype = 0; | |
2373 | uint16_t sublength = 0; | |
2374 | struct bgp_attr_encap_subtlv *tlv; | |
2375 | ||
2376 | if (BGP_ATTR_ENCAP == type) { | |
2377 | subtype = stream_getc(BGP_INPUT(peer)); | |
2378 | sublength = stream_getc(BGP_INPUT(peer)); | |
2379 | length -= 2; | |
1e20238a | 2380 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2381 | } else { |
2382 | subtype = stream_getw(BGP_INPUT(peer)); | |
2383 | sublength = stream_getw(BGP_INPUT(peer)); | |
2384 | length -= 4; | |
65efcfce | 2385 | #endif |
d62a17ae | 2386 | } |
2387 | ||
2388 | if (sublength > length) { | |
2389 | zlog_info( | |
2390 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2391 | sublength, length); | |
2392 | bgp_notify_send_with_data( | |
2393 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2394 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2395 | return -1; | |
2396 | } | |
2397 | ||
2398 | /* alloc and copy sub-tlv */ | |
2399 | /* TBD make sure these are freed when attributes are released */ | |
2400 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2401 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2402 | tlv->type = subtype; |
2403 | tlv->length = sublength; | |
424ab01d | 2404 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2405 | length -= sublength; |
2406 | ||
2407 | /* attach tlv to encap chain */ | |
2408 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2409 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2410 | for (stlv_last = attr->encap_subtlvs; |
2411 | stlv_last && stlv_last->next; | |
2412 | stlv_last = stlv_last->next) | |
2413 | ; | |
2414 | if (stlv_last) { | |
2415 | stlv_last->next = tlv; | |
2416 | } else { | |
2417 | attr->encap_subtlvs = tlv; | |
2418 | } | |
1e20238a | 2419 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2420 | } else { |
e4002056 | 2421 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2422 | for (stlv_last = attr->vnc_subtlvs; |
2423 | stlv_last && stlv_last->next; | |
2424 | stlv_last = stlv_last->next) | |
2425 | ; | |
2426 | if (stlv_last) { | |
2427 | stlv_last->next = tlv; | |
2428 | } else { | |
2429 | attr->vnc_subtlvs = tlv; | |
2430 | } | |
aadc0905 | 2431 | #endif |
d62a17ae | 2432 | } |
d62a17ae | 2433 | } |
f4c89855 | 2434 | |
d62a17ae | 2435 | if (BGP_ATTR_ENCAP == type) { |
2436 | attr->encap_tunneltype = tunneltype; | |
2437 | } | |
f4c89855 | 2438 | |
d62a17ae | 2439 | if (length) { |
2440 | /* spurious leftover data */ | |
2441 | zlog_info( | |
2442 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2443 | length); | |
2444 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2445 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2446 | startp, total); | |
2447 | return -1; | |
2448 | } | |
f4c89855 | 2449 | |
d62a17ae | 2450 | return 0; |
f4c89855 LB |
2451 | } |
2452 | ||
30adbd4e DS |
2453 | /* |
2454 | * Read an individual SID value returning how much data we have read | |
2455 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2456 | */ |
f69aeb76 | 2457 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(uint8_t type, uint16_t length, |
45a06b11 | 2458 | struct bgp_attr_parser_args *args) |
d62a17ae | 2459 | { |
2460 | struct peer *const peer = args->peer; | |
2461 | struct attr *const attr = args->attr; | |
d7c0a89a | 2462 | uint32_t label_index; |
d62a17ae | 2463 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2464 | uint32_t srgb_base; |
2465 | uint32_t srgb_range; | |
d62a17ae | 2466 | int srgb_count; |
e496b420 HS |
2467 | uint8_t sid_type, sid_flags; |
2468 | uint16_t endpoint_behavior; | |
2469 | char buf[BUFSIZ]; | |
d62a17ae | 2470 | |
d62a17ae | 2471 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2472 | if (STREAM_READABLE(peer->curr) < length |
2473 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2474 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2475 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2476 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2477 | return bgp_attr_malformed(args, |
2478 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2479 | args->total); | |
d62a17ae | 2480 | } |
2481 | ||
2482 | /* Ignore flags and reserved */ | |
424ab01d QY |
2483 | stream_getc(peer->curr); |
2484 | stream_getw(peer->curr); | |
d62a17ae | 2485 | |
2486 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2487 | label_index = stream_getl(peer->curr); |
d62a17ae | 2488 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2489 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2490 | args->total); | |
d62a17ae | 2491 | |
2492 | /* Store label index; subsequently, we'll check on | |
2493 | * address-family */ | |
2494 | attr->label_index = label_index; | |
d62a17ae | 2495 | } |
2496 | ||
2497 | /* Placeholder code for the IPv6 SID type */ | |
2498 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
2499 | if (STREAM_READABLE(peer->curr) < length |
2500 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2501 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2502 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 2503 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
2504 | return bgp_attr_malformed(args, |
2505 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2506 | args->total); | |
d62a17ae | 2507 | } |
2508 | ||
2509 | /* Ignore reserved */ | |
424ab01d QY |
2510 | stream_getc(peer->curr); |
2511 | stream_getw(peer->curr); | |
d62a17ae | 2512 | |
424ab01d | 2513 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2514 | } |
2515 | ||
2516 | /* Placeholder code for the Originator SRGB type */ | |
2517 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
2518 | /* |
2519 | * ietf-idr-bgp-prefix-sid-05: | |
2520 | * Length is the total length of the value portion of the | |
2521 | * TLV: 2 + multiple of 6. | |
2522 | * | |
2523 | * peer->curr stream readp should be at the beginning of the 16 | |
2524 | * bit flag field at this point in the code. | |
2525 | */ | |
d62a17ae | 2526 | |
473046ee QY |
2527 | /* |
2528 | * Check that the TLV length field is sane: at least 2 bytes of | |
2529 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
2530 | */ | |
2531 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
2532 | flog_err( | |
2533 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2534 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
2535 | length, |
2536 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2537 | return bgp_attr_malformed( | |
2538 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2539 | args->total); | |
2540 | } | |
d62a17ae | 2541 | |
473046ee QY |
2542 | /* |
2543 | * Check that we actually have at least as much data as | |
2544 | * specified by the length field | |
2545 | */ | |
2546 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 2547 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2548 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 2549 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
2550 | return bgp_attr_malformed( |
2551 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2552 | args->total); | |
2553 | } | |
2554 | ||
473046ee QY |
2555 | /* |
2556 | * Check that the portion of the TLV containing the sequence of | |
2557 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
2558 | * that length, we skip the 16 bit flags field | |
2559 | */ | |
424ab01d | 2560 | stream_getw(peer->curr); |
d62a17ae | 2561 | length -= 2; |
d62a17ae | 2562 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 2563 | flog_err( |
e50f7cfd | 2564 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2565 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 2566 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
2567 | return bgp_attr_malformed( | |
2568 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2569 | args->total); | |
2570 | } | |
2571 | ||
2572 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2573 | ||
2574 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2575 | stream_get(&srgb_base, peer->curr, 3); |
2576 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2577 | } |
2578 | } | |
2579 | ||
e496b420 HS |
2580 | /* Placeholder code for the VPN-SID Service type */ |
2581 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
2582 | if (STREAM_READABLE(peer->curr) < length | |
2583 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
2584 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2585 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
2586 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
2587 | return bgp_attr_malformed(args, | |
2588 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2589 | args->total); | |
2590 | } | |
2591 | ||
2592 | /* Parse VPN-SID Sub-TLV */ | |
2593 | stream_getc(peer->curr); /* reserved */ | |
2594 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
2595 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2596 | stream_get(&ipv6_sid, peer->curr, | |
2597 | sizeof(ipv6_sid)); /* sid_value */ | |
2598 | ||
2599 | /* Log VPN-SID Sub-TLV */ | |
2600 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2601 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2602 | zlog_debug( | |
2603 | "%s: vpn-sid: sid %s, sid-type 0x%02x sid-flags 0x%02x", | |
2604 | __func__, buf, sid_type, sid_flags); | |
2605 | } | |
2606 | ||
2607 | /* Configure from Info */ | |
b502ca11 QY |
2608 | if (attr->srv6_vpn) { |
2609 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2610 | "Prefix SID SRv6 VPN field repeated"); | |
2611 | return bgp_attr_malformed( | |
2612 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2613 | } | |
340594a9 | 2614 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 2615 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
2616 | attr->srv6_vpn->sid_flags = sid_flags; |
2617 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
2618 | } | |
2619 | ||
2620 | /* Placeholder code for the SRv6 L3 Service type */ | |
2621 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
2622 | if (STREAM_READABLE(peer->curr) < length | |
2623 | || length != BGP_PREFIX_SID_SRV6_L3_SERVICE_LENGTH) { | |
2624 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2625 | "Prefix SID SRv6 L3-Service length is %hu instead of %u", |
e496b420 HS |
2626 | length, BGP_PREFIX_SID_SRV6_L3_SERVICE_LENGTH); |
2627 | return bgp_attr_malformed(args, | |
2628 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2629 | args->total); | |
2630 | } | |
2631 | ||
2632 | /* Parse L3-SERVICE Sub-TLV */ | |
2633 | stream_getc(peer->curr); /* reserved */ | |
2634 | stream_get(&ipv6_sid, peer->curr, | |
2635 | sizeof(ipv6_sid)); /* sid_value */ | |
2636 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2637 | endpoint_behavior = stream_getw(peer->curr); /* endpoint */ | |
2638 | stream_getc(peer->curr); /* reserved */ | |
2639 | ||
2640 | /* Log L3-SERVICE Sub-TLV */ | |
2641 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2642 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2643 | zlog_debug( | |
2644 | "%s: srv6-l3-srv sid %s, sid-flags 0x%02x, end-behaviour 0x%04x", | |
2645 | __func__, buf, sid_flags, endpoint_behavior); | |
2646 | } | |
2647 | ||
2648 | /* Configure from Info */ | |
b502ca11 QY |
2649 | if (attr->srv6_l3vpn) { |
2650 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2651 | "Prefix SID SRv6 L3VPN field repeated"); | |
2652 | return bgp_attr_malformed( | |
2653 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2654 | } | |
340594a9 | 2655 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, |
e496b420 HS |
2656 | sizeof(struct bgp_attr_srv6_l3vpn)); |
2657 | attr->srv6_l3vpn->sid_flags = sid_flags; | |
2658 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
2659 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); | |
2660 | } | |
2661 | ||
2662 | /* Placeholder code for Unsupported TLV */ | |
2663 | else { | |
f69aeb76 QY |
2664 | |
2665 | if (STREAM_READABLE(peer->curr) < length) { | |
2666 | flog_err( | |
2667 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2668 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
2669 | length, STREAM_READABLE(peer->curr)); |
2670 | return bgp_attr_malformed( | |
2671 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2672 | args->total); | |
2673 | } | |
2674 | ||
c6ca155d HS |
2675 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2676 | zlog_debug( | |
2677 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
2678 | peer->host, type); | |
f69aeb76 QY |
2679 | |
2680 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
2681 | } |
2682 | ||
d62a17ae | 2683 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
2684 | } |
2685 | ||
30adbd4e DS |
2686 | /* Prefix SID attribute |
2687 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2688 | */ | |
45a06b11 | 2689 | bgp_attr_parse_ret_t bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
2690 | { |
2691 | struct peer *const peer = args->peer; | |
2692 | struct attr *const attr = args->attr; | |
2693 | bgp_attr_parse_ret_t ret; | |
2694 | ||
2695 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2696 | ||
f69aeb76 QY |
2697 | uint8_t type; |
2698 | uint16_t length; | |
2699 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 2700 | size_t psid_parsed_length = 0; |
30adbd4e | 2701 | |
38774fc5 HS |
2702 | while (STREAM_READABLE(peer->curr) > 0 |
2703 | && psid_parsed_length < args->length) { | |
30adbd4e | 2704 | |
f69aeb76 QY |
2705 | if (STREAM_READABLE(peer->curr) < headersz) { |
2706 | flog_err( | |
2707 | EC_BGP_ATTR_LEN, | |
2708 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2709 | headersz, STREAM_READABLE(peer->curr)); | |
2710 | return bgp_attr_malformed( | |
2711 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2712 | args->total); | |
2713 | } | |
30adbd4e | 2714 | |
f69aeb76 QY |
2715 | type = stream_getc(peer->curr); |
2716 | length = stream_getw(peer->curr); | |
30adbd4e | 2717 | |
f69aeb76 | 2718 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 2719 | flog_err( |
e50f7cfd | 2720 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2721 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 2722 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
2723 | return bgp_attr_malformed(args, |
2724 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2725 | args->total); | |
2726 | } | |
f69aeb76 | 2727 | |
45a06b11 | 2728 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
2729 | |
2730 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2731 | return ret; | |
38774fc5 HS |
2732 | |
2733 | psid_parsed_length += length + headersz; | |
2734 | ||
2735 | if (psid_parsed_length > args->length) { | |
2736 | flog_err( | |
2737 | EC_BGP_ATTR_LEN, | |
3efd0893 | 2738 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
2739 | length + headersz, psid_parsed_length - (length + headersz)); |
2740 | return bgp_attr_malformed( | |
2741 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2742 | args->total); | |
2743 | } | |
30adbd4e DS |
2744 | } |
2745 | ||
2746 | return BGP_ATTR_PARSE_PROCEED; | |
2747 | } | |
2748 | ||
7fd077aa | 2749 | /* PMSI tunnel attribute (RFC 6514) |
2750 | * Basic validation checks done here. | |
2751 | */ | |
2752 | static bgp_attr_parse_ret_t | |
2753 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2754 | { | |
2755 | struct peer *const peer = args->peer; | |
2756 | struct attr *const attr = args->attr; | |
2757 | const bgp_size_t length = args->length; | |
d7c0a89a | 2758 | uint8_t tnl_type; |
355f3c11 | 2759 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 2760 | |
2761 | /* Verify that the receiver is expecting "ingress replication" as we | |
2762 | * can only support that. | |
2763 | */ | |
355f3c11 | 2764 | if (length < attr_parse_len) { |
1c50c1c0 QY |
2765 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
2766 | length); | |
7fd077aa | 2767 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2768 | args->total); | |
2769 | } | |
2770 | stream_getc(peer->curr); /* Flags */ | |
2771 | tnl_type = stream_getc(peer->curr); | |
2772 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 2773 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 2774 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 2775 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2776 | args->total); | |
2777 | } | |
2778 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2779 | if (length != 9) { | |
e50f7cfd | 2780 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
2781 | "Bad PMSI tunnel attribute length %d for IR", |
2782 | length); | |
052ea98b | 2783 | return bgp_attr_malformed( |
2784 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2785 | args->total); | |
7fd077aa | 2786 | } |
2787 | } | |
2788 | ||
2789 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2790 | attr->pmsi_tnl_type = tnl_type; | |
355f3c11 | 2791 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 2792 | |
2793 | /* Forward read pointer of input stream. */ | |
355f3c11 | 2794 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 2795 | |
2796 | return BGP_ATTR_PARSE_PROCEED; | |
2797 | } | |
2798 | ||
718e3744 | 2799 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2800 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2801 | { | |
2802 | bgp_size_t total = args->total; | |
2803 | struct transit *transit; | |
2804 | struct peer *const peer = args->peer; | |
2805 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
2806 | uint8_t *const startp = args->startp; |
2807 | const uint8_t type = args->type; | |
2808 | const uint8_t flag = args->flags; | |
d62a17ae | 2809 | const bgp_size_t length = args->length; |
2810 | ||
2811 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2812 | zlog_debug( | |
2813 | "%s Unknown attribute is received (type %d, length %d)", | |
2814 | peer->host, type, length); | |
2815 | ||
2816 | /* Forward read pointer of input stream. */ | |
424ab01d | 2817 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2818 | |
2819 | /* If any of the mandatory well-known attributes are not recognized, | |
2820 | then the Error Subcode is set to Unrecognized Well-known | |
2821 | Attribute. The Data field contains the unrecognized attribute | |
2822 | (type, length and value). */ | |
2823 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2824 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2825 | args->total); | |
2826 | } | |
2827 | ||
2828 | /* Unrecognized non-transitive optional attributes must be quietly | |
2829 | ignored and not passed along to other BGP peers. */ | |
2830 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2831 | return BGP_ATTR_PARSE_PROCEED; | |
2832 | ||
2833 | /* If a path with recognized transitive optional attribute is | |
2834 | accepted and passed along to other BGP peers and the Partial bit | |
2835 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2836 | is not set back to 0 by the current AS. */ | |
2837 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2838 | ||
2839 | /* Store transitive attribute to the end of attr->transit. */ | |
2840 | if (!attr->transit) | |
2841 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2842 | ||
2843 | transit = attr->transit; | |
2844 | ||
2845 | if (transit->val) | |
2846 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2847 | transit->length + total); | |
2848 | else | |
2849 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2850 | ||
2851 | memcpy(transit->val + transit->length, startp, total); | |
2852 | transit->length += total; | |
2853 | ||
2854 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2855 | } |
2856 | ||
bb7bef14 | 2857 | /* Well-known attribute check. */ |
d62a17ae | 2858 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2859 | { | |
d7c0a89a | 2860 | uint8_t type = 0; |
d62a17ae | 2861 | |
2862 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2863 | * empty UPDATE. */ | |
2864 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2865 | return BGP_ATTR_PARSE_PROCEED; | |
2866 | ||
2867 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2868 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2869 | are present, it should. Check for any other attribute being present | |
2870 | instead. | |
2871 | */ | |
404c82d5 PG |
2872 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
2873 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 2874 | return BGP_ATTR_PARSE_PROCEED; |
2875 | ||
2876 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2877 | type = BGP_ATTR_ORIGIN; | |
2878 | ||
2879 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2880 | type = BGP_ATTR_AS_PATH; | |
2881 | ||
2882 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2883 | * and | |
2884 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2885 | */ | |
2886 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2887 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2888 | type = BGP_ATTR_NEXT_HOP; | |
2889 | ||
2890 | if (peer->sort == BGP_PEER_IBGP | |
2891 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2892 | type = BGP_ATTR_LOCAL_PREF; | |
2893 | ||
4ba5a9c5 DA |
2894 | /* If any of the well-known mandatory attributes are not present |
2895 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
2896 | */ | |
d62a17ae | 2897 | if (type) { |
e50f7cfd | 2898 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 2899 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 2900 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 2901 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 2902 | } |
2903 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2904 | } |
2905 | ||
718e3744 | 2906 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2907 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2908 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2909 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2910 | struct bgp_nlri *mp_withdraw) | |
2911 | { | |
f7813c7c | 2912 | bgp_attr_parse_ret_t ret; |
d7c0a89a QY |
2913 | uint8_t flag = 0; |
2914 | uint8_t type = 0; | |
d62a17ae | 2915 | bgp_size_t length; |
d7c0a89a QY |
2916 | uint8_t *startp, *endp; |
2917 | uint8_t *attr_endp; | |
2918 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 2919 | /* we need the as4_path only until we have synthesized the as_path with |
2920 | * it */ | |
2921 | /* same goes for as4_aggregator */ | |
2922 | struct aspath *as4_path = NULL; | |
2923 | as_t as4_aggregator = 0; | |
2924 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2925 | ||
2926 | /* Initialize bitmap. */ | |
2927 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2928 | ||
2929 | /* End pointer of BGP attribute. */ | |
2930 | endp = BGP_INPUT_PNT(peer) + size; | |
2931 | ||
2932 | /* Get attributes to the end of attribute length. */ | |
2933 | while (BGP_INPUT_PNT(peer) < endp) { | |
2934 | /* Check remaining length check.*/ | |
2935 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2936 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 2937 | flog_warn( |
e50f7cfd | 2938 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
2939 | "%s: error BGP attribute length %lu is smaller than min len", |
2940 | peer->host, | |
2941 | (unsigned long)(endp | |
2942 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 2943 | |
2944 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2945 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
2946 | ret = BGP_ATTR_PARSE_ERROR; |
2947 | goto done; | |
d62a17ae | 2948 | } |
718e3744 | 2949 | |
d62a17ae | 2950 | /* Fetch attribute flag and type. */ |
2951 | startp = BGP_INPUT_PNT(peer); | |
2952 | /* "The lower-order four bits of the Attribute Flags octet are | |
2953 | unused. They MUST be zero when sent and MUST be ignored when | |
2954 | received." */ | |
2955 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2956 | type = stream_getc(BGP_INPUT(peer)); | |
2957 | ||
2958 | /* Check whether Extended-Length applies and is in bounds */ | |
2959 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2960 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 2961 | flog_warn( |
e50f7cfd | 2962 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
2963 | "%s: Extended length set, but just %lu bytes of attr header", |
2964 | peer->host, | |
2965 | (unsigned long)(endp | |
2966 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 2967 | |
2968 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2969 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
2970 | ret = BGP_ATTR_PARSE_ERROR; |
2971 | goto done; | |
d62a17ae | 2972 | } |
718e3744 | 2973 | |
d62a17ae | 2974 | /* Check extended attribue length bit. */ |
2975 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2976 | length = stream_getw(BGP_INPUT(peer)); | |
2977 | else | |
2978 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2979 | |
d62a17ae | 2980 | /* If any attribute appears more than once in the UPDATE |
2981 | message, then the Error Subcode is set to Malformed Attribute | |
2982 | List. */ | |
718e3744 | 2983 | |
d62a17ae | 2984 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 2985 | flog_warn( |
e50f7cfd | 2986 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
2987 | "%s: error BGP attribute type %d appears twice in a message", |
2988 | peer->host, type); | |
718e3744 | 2989 | |
d62a17ae | 2990 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2991 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
2992 | ret = BGP_ATTR_PARSE_ERROR; |
2993 | goto done; | |
d62a17ae | 2994 | } |
2995 | ||
2996 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2997 | unsigned char so it never overflow bitmap range. */ | |
2998 | ||
2999 | SET_BITMAP(seen, type); | |
3000 | ||
3001 | /* Overflow check. */ | |
3002 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3003 | ||
3004 | if (attr_endp > endp) { | |
ade6974d | 3005 | flog_warn( |
e50f7cfd | 3006 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3007 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3008 | peer->host, type, length, size, attr_endp, | |
3009 | endp); | |
dacffad4 QY |
3010 | /* |
3011 | * RFC 4271 6.3 | |
3012 | * If any recognized attribute has an Attribute | |
3013 | * Length that conflicts with the expected length | |
3014 | * (based on the attribute type code), then the | |
3015 | * Error Subcode MUST be set to Attribute Length | |
3016 | * Error. The Data field MUST contain the erroneous | |
3017 | * attribute (type, length, and value). | |
3018 | * ---------- | |
3019 | * We do not currently have a good way to determine the | |
3020 | * length of the attribute independent of the length | |
3021 | * received in the message. Instead we send the | |
3022 | * minimum between the amount of data we have and the | |
3023 | * amount specified by the attribute length field. | |
3024 | * | |
3025 | * Instead of directly passing in the packet buffer and | |
3026 | * offset we use the stream_get* functions to read into | |
3027 | * a stack buffer, since they perform bounds checking | |
3028 | * and we are working with untrusted data. | |
3029 | */ | |
3030 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
3031 | memset(ndata, 0x00, sizeof(ndata)); | |
3032 | size_t lfl = | |
3033 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3034 | /* Rewind to end of flag field */ | |
763a5d3c | 3035 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3036 | /* Type */ |
3037 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3038 | /* Length */ | |
3039 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3040 | /* Value */ | |
3041 | size_t atl = attr_endp - startp; | |
3042 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3043 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3044 | ||
d62a17ae | 3045 | bgp_notify_send_with_data( |
3046 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3047 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3048 | ndl + lfl + 1); | |
3049 | ||
b6a171c7 QY |
3050 | ret = BGP_ATTR_PARSE_ERROR; |
3051 | goto done; | |
d62a17ae | 3052 | } |
3053 | ||
3054 | struct bgp_attr_parser_args attr_args = { | |
3055 | .peer = peer, | |
3056 | .length = length, | |
3057 | .attr = attr, | |
3058 | .type = type, | |
3059 | .flags = flag, | |
3060 | .startp = startp, | |
3061 | .total = attr_endp - startp, | |
3062 | }; | |
3063 | ||
3064 | ||
3065 | /* If any recognized attribute has Attribute Flags that conflict | |
3066 | with the Attribute Type Code, then the Error Subcode is set | |
3067 | to | |
3068 | Attribute Flags Error. The Data field contains the erroneous | |
3069 | attribute (type, length and value). */ | |
3070 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3071 | ret = bgp_attr_malformed( |
3072 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3073 | attr_args.total); | |
3074 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3075 | continue; | |
b6a171c7 | 3076 | goto done; |
d62a17ae | 3077 | } |
3078 | ||
3079 | /* OK check attribute and store it's value. */ | |
3080 | switch (type) { | |
3081 | case BGP_ATTR_ORIGIN: | |
3082 | ret = bgp_attr_origin(&attr_args); | |
3083 | break; | |
3084 | case BGP_ATTR_AS_PATH: | |
3085 | ret = bgp_attr_aspath(&attr_args); | |
3086 | break; | |
3087 | case BGP_ATTR_AS4_PATH: | |
3088 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3089 | break; | |
3090 | case BGP_ATTR_NEXT_HOP: | |
3091 | ret = bgp_attr_nexthop(&attr_args); | |
3092 | break; | |
3093 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3094 | ret = bgp_attr_med(&attr_args); | |
3095 | break; | |
3096 | case BGP_ATTR_LOCAL_PREF: | |
3097 | ret = bgp_attr_local_pref(&attr_args); | |
3098 | break; | |
3099 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3100 | ret = bgp_attr_atomic(&attr_args); | |
3101 | break; | |
3102 | case BGP_ATTR_AGGREGATOR: | |
3103 | ret = bgp_attr_aggregator(&attr_args); | |
3104 | break; | |
3105 | case BGP_ATTR_AS4_AGGREGATOR: | |
3106 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3107 | &as4_aggregator, | |
3108 | &as4_aggregator_addr); | |
3109 | break; | |
3110 | case BGP_ATTR_COMMUNITIES: | |
3111 | ret = bgp_attr_community(&attr_args); | |
3112 | break; | |
3113 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3114 | ret = bgp_attr_large_community(&attr_args); | |
3115 | break; | |
3116 | case BGP_ATTR_ORIGINATOR_ID: | |
3117 | ret = bgp_attr_originator_id(&attr_args); | |
3118 | break; | |
3119 | case BGP_ATTR_CLUSTER_LIST: | |
3120 | ret = bgp_attr_cluster_list(&attr_args); | |
3121 | break; | |
3122 | case BGP_ATTR_MP_REACH_NLRI: | |
3123 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3124 | break; | |
3125 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3126 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3127 | break; | |
3128 | case BGP_ATTR_EXT_COMMUNITIES: | |
3129 | ret = bgp_attr_ext_communities(&attr_args); | |
3130 | break; | |
1e20238a | 3131 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3132 | case BGP_ATTR_VNC: |
65efcfce | 3133 | #endif |
d62a17ae | 3134 | case BGP_ATTR_ENCAP: |
3135 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3136 | startp); | |
3137 | break; | |
3138 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3139 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3140 | break; |
7fd077aa | 3141 | case BGP_ATTR_PMSI_TUNNEL: |
3142 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3143 | break; | |
9a659715 PG |
3144 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3145 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3146 | break; | |
d62a17ae | 3147 | default: |
3148 | ret = bgp_attr_unknown(&attr_args); | |
3149 | break; | |
3150 | } | |
3151 | ||
3152 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3153 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3154 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3155 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3156 | goto done; |
d62a17ae | 3157 | } |
3158 | ||
9b9df989 | 3159 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3160 | goto done; |
9b9df989 DS |
3161 | } |
3162 | ||
d62a17ae | 3163 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3164 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3165 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3166 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3167 | goto done; |
d62a17ae | 3168 | } |
3169 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3170 | flog_warn( |
e50f7cfd | 3171 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3172 | "%s: Attribute %s, parse error - treating as withdrawal", |
3173 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3174 | goto done; |
d62a17ae | 3175 | } |
3176 | ||
3177 | /* Check the fetched length. */ | |
3178 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3179 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3180 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3181 | peer->host, lookup_msg(attr_str, type, NULL)); |
3182 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3183 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3184 | ret = BGP_ATTR_PARSE_ERROR; |
3185 | goto done; | |
d62a17ae | 3186 | } |
718e3744 | 3187 | } |
d62a17ae | 3188 | |
e5d4cda0 HS |
3189 | /* |
3190 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3191 | * About Prefix-SID path attribute, | |
3192 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3193 | * may only appear in a BGP Prefix-SID attribute attached to | |
3194 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3195 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3196 | */ | |
3197 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3198 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3199 | ||
d62a17ae | 3200 | /* Check final read pointer is same as end pointer. */ |
3201 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3202 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3203 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3204 | lookup_msg(attr_str, type, NULL)); |
3205 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3206 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3207 | |
3208 | ret = BGP_ATTR_PARSE_ERROR; | |
3209 | goto done; | |
d62a17ae | 3210 | } |
3211 | ||
88f33d66 | 3212 | /* |
3213 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3214 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3215 | * This is implemented below and will result in a NOTIFICATION. If the | |
3216 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3217 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3218 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3219 | * | |
3220 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3221 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3222 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3223 | * speaker that receives the message SHOULD ignore this attribute. | |
3224 | */ | |
3225 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3226 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3227 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3228 | ret = BGP_ATTR_PARSE_ERROR; |
3229 | goto done; | |
88f33d66 | 3230 | } |
3231 | } | |
3232 | ||
d62a17ae | 3233 | /* Check all mandatory well-known attributes are present */ |
b6a171c7 QY |
3234 | if ((ret = bgp_attr_check(peer, attr)) < 0) |
3235 | goto done; | |
d62a17ae | 3236 | |
3237 | /* | |
3238 | * At this place we can see whether we got AS4_PATH and/or | |
3239 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3240 | * We can not do this before we've read all attributes because | |
3241 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3242 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3243 | * in relationship to AGGREGATOR. | |
3244 | * So, to be defensive, we are not relying on any order and read | |
3245 | * all attributes first, including these 32bit ones, and now, | |
3246 | * afterwards, we look what and if something is to be done for as4. | |
3247 | * | |
3248 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3249 | * MP_UNREACH_NLRI. | |
3250 | */ | |
3251 | /* actually... this doesn't ever return failure currently, but | |
3252 | * better safe than sorry */ | |
3253 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3254 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3255 | &as4_aggregator_addr)) { | |
3256 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3257 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3258 | ret = BGP_ATTR_PARSE_ERROR; |
3259 | goto done; | |
d62a17ae | 3260 | } |
3261 | ||
d62a17ae | 3262 | /* |
3263 | * Finally do the checks on the aspath we did not do yet | |
3264 | * because we waited for a potentially synthesized aspath. | |
3265 | */ | |
3266 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3267 | ret = bgp_attr_aspath_check(peer, attr); | |
3268 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3269 | goto done; |
d62a17ae | 3270 | } |
718e3744 | 3271 | |
b6a171c7 | 3272 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3273 | done: |
5e0e9c09 | 3274 | |
b6a171c7 QY |
3275 | /* |
3276 | * At this stage, we have done all fiddling with as4, and the | |
3277 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3278 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3279 | * to save memory | |
3280 | */ | |
3281 | if (as4_path) { | |
3282 | /* | |
3283 | * unintern - it is in the hash | |
3284 | * The flag that we got this is still there, but that | |
3285 | * does not do any trouble | |
3286 | */ | |
3287 | aspath_unintern(&as4_path); | |
3288 | } | |
3289 | ||
3290 | if (ret != BGP_ATTR_PARSE_ERROR) { | |
3291 | /* Finally intern unknown attribute. */ | |
3292 | if (attr->transit) | |
3293 | attr->transit = transit_intern(attr->transit); | |
3294 | if (attr->encap_subtlvs) | |
3295 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3296 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3297 | #ifdef ENABLE_BGP_VNC |
5e0e9c09 QY |
3298 | if (attr->vnc_subtlvs) |
3299 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
3300 | VNC_SUBTLV_TYPE); | |
3301 | #endif | |
3302 | } else { | |
3303 | if (attr->transit) { | |
3304 | transit_free(attr->transit); | |
3305 | attr->transit = NULL; | |
3306 | } | |
3307 | ||
3308 | bgp_attr_flush_encap(attr); | |
3309 | }; | |
3310 | ||
3311 | /* Sanity checks */ | |
d62a17ae | 3312 | if (attr->transit) |
5e0e9c09 | 3313 | assert(attr->transit->refcnt > 0); |
d62a17ae | 3314 | if (attr->encap_subtlvs) |
5e0e9c09 | 3315 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3316 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 3317 | if (attr->vnc_subtlvs) |
5e0e9c09 | 3318 | assert(attr->vnc_subtlvs->refcnt > 0); |
bede7744 | 3319 | #endif |
718e3744 | 3320 | |
b6a171c7 | 3321 | return ret; |
d62a17ae | 3322 | } |
3323 | ||
f4bd90c5 LK |
3324 | /* |
3325 | * Extract the tunnel type from extended community | |
3326 | */ | |
3327 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3328 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3329 | { |
3330 | struct ecommunity *ecom; | |
3331 | int i; | |
3332 | if (!attr) | |
fa346686 | 3333 | return; |
f4bd90c5 LK |
3334 | |
3335 | ecom = attr->ecommunity; | |
3336 | if (!ecom || !ecom->size) | |
fa346686 | 3337 | return; |
f4bd90c5 LK |
3338 | |
3339 | for (i = 0; i < ecom->size; i++) { | |
3340 | uint8_t *pnt; | |
3341 | uint8_t type, sub_type; | |
3342 | ||
3343 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3344 | type = pnt[0]; | |
3345 | sub_type = pnt[1]; | |
3346 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3347 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3348 | continue; | |
3349 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3350 | return; |
f4bd90c5 LK |
3351 | } |
3352 | ||
fa346686 | 3353 | return; |
f4bd90c5 LK |
3354 | } |
3355 | ||
d62a17ae | 3356 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3357 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3358 | struct attr *attr) | |
3359 | { | |
3360 | size_t sizep; | |
3361 | iana_afi_t pkt_afi; | |
5c525538 | 3362 | iana_safi_t pkt_safi; |
d62a17ae | 3363 | afi_t nh_afi; |
3364 | ||
3365 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3366 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3367 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3368 | sizep = stream_get_endp(s); | |
3369 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3370 | ||
3371 | ||
3372 | /* Convert AFI, SAFI to values for packet. */ | |
3373 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3374 | ||
3375 | stream_putw(s, pkt_afi); /* AFI */ | |
3376 | stream_putc(s, pkt_safi); /* SAFI */ | |
3377 | ||
3378 | /* Nexthop AFI */ | |
ce78a6fb | 3379 | if (afi == AFI_IP |
e496b420 HS |
3380 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3381 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3382 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3383 | else if (safi == SAFI_FLOWSPEC) |
3384 | nh_afi = afi; | |
d62a17ae | 3385 | else |
3386 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3387 | ||
3388 | /* Nexthop */ | |
3389 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3390 | switch (nh_afi) { | |
3391 | case AFI_IP: | |
3392 | switch (safi) { | |
3393 | case SAFI_UNICAST: | |
3394 | case SAFI_MULTICAST: | |
3395 | case SAFI_LABELED_UNICAST: | |
3396 | stream_putc(s, 4); | |
3397 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3398 | break; | |
3399 | case SAFI_MPLS_VPN: | |
3400 | stream_putc(s, 12); | |
3401 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3402 | stream_putl(s, 0); | |
3403 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3404 | break; | |
3405 | case SAFI_ENCAP: | |
3406 | case SAFI_EVPN: | |
3407 | stream_putc(s, 4); | |
3408 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3409 | break; | |
7c40bf39 | 3410 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3411 | if (attr->mp_nexthop_len == 0) |
3412 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3413 | else { | |
3414 | stream_putc(s, attr->mp_nexthop_len); | |
3415 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3416 | } | |
d62a17ae | 3417 | default: |
3418 | break; | |
3419 | } | |
3420 | break; | |
3421 | case AFI_IP6: | |
3422 | switch (safi) { | |
3423 | case SAFI_UNICAST: | |
3424 | case SAFI_MULTICAST: | |
3425 | case SAFI_LABELED_UNICAST: | |
3426 | case SAFI_EVPN: { | |
3427 | if (attr->mp_nexthop_len | |
3428 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3429 | stream_putc(s, | |
3430 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
3431 | stream_put(s, &attr->mp_nexthop_global, | |
3432 | IPV6_MAX_BYTELEN); | |
3433 | stream_put(s, &attr->mp_nexthop_local, | |
3434 | IPV6_MAX_BYTELEN); | |
3435 | } else { | |
3436 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3437 | stream_put(s, &attr->mp_nexthop_global, | |
3438 | IPV6_MAX_BYTELEN); | |
3439 | } | |
3440 | } break; | |
3441 | case SAFI_MPLS_VPN: { | |
3442 | if (attr->mp_nexthop_len | |
3443 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
3444 | stream_putc(s, 24); | |
3445 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3446 | stream_putl(s, 0); | |
3447 | stream_put(s, &attr->mp_nexthop_global, | |
3448 | IPV6_MAX_BYTELEN); | |
3449 | } else if (attr->mp_nexthop_len | |
3450 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3451 | stream_putc(s, 48); | |
3452 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3453 | stream_putl(s, 0); | |
3454 | stream_put(s, &attr->mp_nexthop_global, | |
3455 | IPV6_MAX_BYTELEN); | |
3456 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3457 | stream_putl(s, 0); | |
3458 | stream_put(s, &attr->mp_nexthop_local, | |
3459 | IPV6_MAX_BYTELEN); | |
3460 | } | |
3461 | } break; | |
3462 | case SAFI_ENCAP: | |
3463 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3464 | stream_put(s, &attr->mp_nexthop_global, | |
3465 | IPV6_MAX_BYTELEN); | |
3466 | break; | |
7c40bf39 | 3467 | case SAFI_FLOWSPEC: |
3468 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 3469 | default: |
3470 | break; | |
3471 | } | |
3472 | break; | |
8c71e481 | 3473 | default: |
a83da8e1 | 3474 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 3475 | flog_err( |
e50f7cfd | 3476 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
3477 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
3478 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 3479 | break; |
3480 | } | |
3481 | ||
3482 | /* SNPA */ | |
3483 | stream_putc(s, 0); | |
3484 | return sizep; | |
3485 | } | |
3486 | ||
3487 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
3488 | const struct prefix *p, |
3489 | const struct prefix_rd *prd, mpls_label_t *label, | |
3490 | uint32_t num_labels, int addpath_encode, | |
3491 | uint32_t addpath_tx_id, struct attr *attr) | |
d62a17ae | 3492 | { |
3493 | if (safi == SAFI_MPLS_VPN) { | |
3494 | if (addpath_encode) | |
3495 | stream_putl(s, addpath_tx_id); | |
3496 | /* Label, RD, Prefix write. */ | |
3497 | stream_putc(s, p->prefixlen + 88); | |
3498 | stream_put(s, label, BGP_LABEL_BYTES); | |
3499 | stream_put(s, prd->val, 8); | |
3500 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
3501 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
3502 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
3503 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
3504 | addpath_encode, addpath_tx_id); | |
d62a17ae | 3505 | } else if (safi == SAFI_LABELED_UNICAST) { |
3506 | /* Prefix write with label. */ | |
ec15e1b5 QY |
3507 | stream_put_labeled_prefix(s, p, label, addpath_encode, |
3508 | addpath_tx_id); | |
7c40bf39 | 3509 | } else if (safi == SAFI_FLOWSPEC) { |
f1af8f04 PG |
3510 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
3511 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
3512 | p->u.prefix_flowspec.prefixlen); | |
d62a17ae | 3513 | } else |
3514 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
3515 | } | |
3516 | ||
5f040085 DS |
3517 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
3518 | const struct prefix *p) | |
d62a17ae | 3519 | { |
3520 | int size = PSIZE(p->prefixlen); | |
3521 | if (safi == SAFI_MPLS_VPN) | |
3522 | size += 88; | |
4195afbf EDP |
3523 | else if (safi == SAFI_LABELED_UNICAST) |
3524 | size += BGP_LABEL_BYTES; | |
d62a17ae | 3525 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
3526 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
3527 | // type-5 | |
3528 | return size; | |
8c71e481 PM |
3529 | } |
3530 | ||
f4c89855 | 3531 | /* |
65efcfce | 3532 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 3533 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 3534 | * almost the same TLV format |
f4c89855 | 3535 | */ |
d62a17ae | 3536 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
3537 | struct stream *s, struct attr *attr, | |
3538 | uint8_t attrtype) | |
3539 | { | |
3540 | unsigned int attrlenfield = 0; | |
3541 | unsigned int attrhdrlen = 0; | |
3542 | struct bgp_attr_encap_subtlv *subtlvs; | |
3543 | struct bgp_attr_encap_subtlv *st; | |
3544 | const char *attrname; | |
3545 | ||
9d303b37 DL |
3546 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
3547 | && (!attr->encap_tunneltype | |
3548 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 3549 | return; |
3550 | ||
3551 | switch (attrtype) { | |
f4c89855 | 3552 | case BGP_ATTR_ENCAP: |
d62a17ae | 3553 | attrname = "Tunnel Encap"; |
3554 | subtlvs = attr->encap_subtlvs; | |
3555 | if (subtlvs == NULL) /* nothing to do */ | |
3556 | return; | |
3557 | /* | |
3558 | * The tunnel encap attr has an "outer" tlv. | |
3559 | * T = tunneltype, | |
3560 | * L = total length of subtlvs, | |
3561 | * V = concatenated subtlvs. | |
3562 | */ | |
3563 | attrlenfield = 2 + 2; /* T + L */ | |
3564 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
3565 | break; | |
f4c89855 | 3566 | |
1e20238a | 3567 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 3568 | case BGP_ATTR_VNC: |
d62a17ae | 3569 | attrname = "VNC"; |
3570 | subtlvs = attr->vnc_subtlvs; | |
3571 | if (subtlvs == NULL) /* nothing to do */ | |
3572 | return; | |
3573 | attrlenfield = 0; /* no outer T + L */ | |
3574 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
3575 | break; | |
65efcfce LB |
3576 | #endif |
3577 | ||
f4c89855 | 3578 | default: |
d62a17ae | 3579 | assert(0); |
3580 | } | |
3581 | ||
3582 | /* compute attr length */ | |
3583 | for (st = subtlvs; st; st = st->next) { | |
3584 | attrlenfield += (attrhdrlen + st->length); | |
3585 | } | |
3586 | ||
3587 | if (attrlenfield > 0xffff) { | |
3588 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
3589 | attrname, attrlenfield); | |
3590 | return; | |
3591 | } | |
3592 | ||
3593 | if (attrlenfield > 0xff) { | |
3594 | /* 2-octet length field */ | |
996c9314 LB |
3595 | stream_putc(s, |
3596 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3597 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3598 | stream_putc(s, attrtype); |
3599 | stream_putw(s, attrlenfield & 0xffff); | |
3600 | } else { | |
3601 | /* 1-octet length field */ | |
3602 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
3603 | stream_putc(s, attrtype); | |
3604 | stream_putc(s, attrlenfield & 0xff); | |
3605 | } | |
3606 | ||
3607 | if (attrtype == BGP_ATTR_ENCAP) { | |
3608 | /* write outer T+L */ | |
3609 | stream_putw(s, attr->encap_tunneltype); | |
3610 | stream_putw(s, attrlenfield - 4); | |
3611 | } | |
3612 | ||
3613 | /* write each sub-tlv */ | |
3614 | for (st = subtlvs; st; st = st->next) { | |
3615 | if (attrtype == BGP_ATTR_ENCAP) { | |
3616 | stream_putc(s, st->type); | |
3617 | stream_putc(s, st->length); | |
1e20238a | 3618 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 3619 | } else { |
3620 | stream_putw(s, st->type); | |
3621 | stream_putw(s, st->length); | |
65efcfce | 3622 | #endif |
d62a17ae | 3623 | } |
3624 | stream_put(s, st->value, st->length); | |
3625 | } | |
f4c89855 | 3626 | } |
f4c89855 | 3627 | |
d62a17ae | 3628 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 3629 | { |
d62a17ae | 3630 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
3631 | the attr length */ | |
3632 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
3633 | } |
3634 | ||
3dc339cd | 3635 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
3636 | { |
3637 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
3638 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
3639 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3640 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
3641 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3642 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
3643 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3644 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
3645 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3646 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
3647 | return true; |
3648 | return false; | |
6b5a72a3 DA |
3649 | } |
3650 | ||
718e3744 | 3651 | /* Make attribute packet. */ |
d62a17ae | 3652 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
3653 | struct stream *s, struct attr *attr, | |
3654 | struct bpacket_attr_vec_arr *vecarr, | |
3655 | struct prefix *p, afi_t afi, safi_t safi, | |
3656 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
3657 | mpls_label_t *label, uint32_t num_labels, |
3658 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 3659 | { |
3660 | size_t cp; | |
3661 | size_t aspath_sizep; | |
3662 | struct aspath *aspath; | |
3663 | int send_as4_path = 0; | |
3664 | int send_as4_aggregator = 0; | |
3665 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
3666 | ||
3667 | if (!bgp) | |
3668 | bgp = peer->bgp; | |
3669 | ||
3670 | /* Remember current pointer. */ | |
3671 | cp = stream_get_endp(s); | |
3672 | ||
3673 | if (p | |
3674 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3675 | && !peer_cap_enhe(peer, afi, safi))) { | |
3676 | size_t mpattrlen_pos = 0; | |
3677 | ||
3678 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3679 | vecarr, attr); | |
996c9314 LB |
3680 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3681 | num_labels, addpath_encode, | |
3682 | addpath_tx_id, attr); | |
d62a17ae | 3683 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3684 | } |
d62a17ae | 3685 | |
3686 | /* Origin attribute. */ | |
3687 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3688 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3689 | stream_putc(s, 1); | |
3690 | stream_putc(s, attr->origin); | |
3691 | ||
3692 | /* AS path attribute. */ | |
3693 | ||
3694 | /* If remote-peer is EBGP */ | |
3695 | if (peer->sort == BGP_PEER_EBGP | |
3696 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3697 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3698 | || attr->aspath->segments == NULL) | |
3699 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3700 | PEER_FLAG_RSERVER_CLIENT))) { | |
3701 | aspath = aspath_dup(attr->aspath); | |
3702 | ||
3703 | /* Even though we may not be configured for confederations we | |
3704 | * may have | |
3705 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3706 | aspath = aspath_delete_confed_seq(aspath); | |
3707 | ||
3708 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3709 | /* Stuff our path CONFED_ID on the front */ | |
3710 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3711 | } else { | |
3712 | if (peer->change_local_as) { | |
3713 | /* If replace-as is specified, we only use the | |
3714 | change_local_as when | |
3715 | advertising routes. */ | |
6b5a72a3 DA |
3716 | if (!CHECK_FLAG(peer->flags, |
3717 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
3718 | if (bgp_append_local_as(peer, afi, | |
3719 | safi)) | |
3720 | aspath = aspath_add_seq( | |
3721 | aspath, peer->local_as); | |
d62a17ae | 3722 | aspath = aspath_add_seq(aspath, |
3723 | peer->change_local_as); | |
3724 | } else { | |
3725 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3726 | } | |
3727 | } | |
3728 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3729 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3730 | * thing */ | |
3731 | aspath = aspath_dup(attr->aspath); | |
3732 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3733 | } else | |
3734 | aspath = attr->aspath; | |
3735 | ||
3736 | /* If peer is not AS4 capable, then: | |
3737 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3738 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3739 | * segment | |
3740 | * types are in it (i.e. exclude them if they are there) | |
3741 | * AND do this only if there is at least one asnum > 65535 in the | |
3742 | * path! | |
3743 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3744 | * change | |
3745 | * all ASnums > 65535 to BGP_AS_TRANS | |
3746 | */ | |
3747 | ||
3748 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3749 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3750 | aspath_sizep = stream_get_endp(s); | |
3751 | stream_putw(s, 0); | |
3752 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3753 | ||
3754 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3755 | * in the path | |
3756 | */ | |
3757 | if (!use32bit && aspath_has_as4(aspath)) | |
3758 | send_as4_path = | |
3759 | 1; /* we'll do this later, at the correct place */ | |
3760 | ||
3761 | /* Nexthop attribute. */ | |
3762 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3763 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
3764 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
3765 | ||
d62a17ae | 3766 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
3767 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3768 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3769 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3770 | attr); | |
3771 | stream_putc(s, 4); | |
3772 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
3773 | } else if (peer_cap_enhe(from, afi, safi) |
3774 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 3775 | /* |
3776 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
3777 | * received with Extended Next-hop capability in this |
3778 | * or another vrf and is now being advertised to | |
3779 | * non-ENHE peers. Since peer_cap_enhe only checks | |
3780 | * peers in this vrf, also check the nh_afi to catch | |
3781 | * the case where the originator was in another vrf. | |
d62a17ae | 3782 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
3783 | * to enable implicit next-hop self with correct A-F |
3784 | * (ipv4 address family). | |
d62a17ae | 3785 | */ |
3786 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3787 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3788 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3789 | NULL); | |
3790 | stream_putc(s, 4); | |
3791 | stream_put_ipv4(s, 0); | |
3792 | } | |
718e3744 | 3793 | } |
d62a17ae | 3794 | |
3795 | /* MED attribute. */ | |
3796 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3797 | || bgp->maxmed_active) { | |
3798 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3799 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3800 | stream_putc(s, 4); | |
3801 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3802 | : attr->med)); | |
3803 | } | |
3804 | ||
3805 | /* Local preference. */ | |
3806 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3807 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3808 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3809 | stream_putc(s, 4); | |
3810 | stream_putl(s, attr->local_pref); | |
3811 | } | |
3812 | ||
3813 | /* Atomic aggregate. */ | |
3814 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3815 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3816 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3817 | stream_putc(s, 0); | |
3818 | } | |
3819 | ||
3820 | /* Aggregator. */ | |
3821 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3822 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3823 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3824 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3825 | ||
3826 | if (use32bit) { | |
3827 | /* AS4 capable peer */ | |
3828 | stream_putc(s, 8); | |
3829 | stream_putl(s, attr->aggregator_as); | |
3830 | } else { | |
3831 | /* 2-byte AS peer */ | |
3832 | stream_putc(s, 6); | |
3833 | ||
3834 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3835 | * used? */ | |
3836 | if (attr->aggregator_as > 65535) { | |
3837 | stream_putw(s, BGP_AS_TRANS); | |
3838 | ||
3839 | /* we have to send AS4_AGGREGATOR, too. | |
3840 | * we'll do that later in order to send | |
3841 | * attributes in ascending | |
3842 | * order. | |
3843 | */ | |
3844 | send_as4_aggregator = 1; | |
3845 | } else | |
d7c0a89a | 3846 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 3847 | } |
3848 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3849 | } | |
3850 | ||
3851 | /* Community attribute. */ | |
3852 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3853 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3854 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3855 | stream_putc(s, |
3856 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3857 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3858 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3859 | stream_putw(s, attr->community->size * 4); | |
3860 | } else { | |
996c9314 LB |
3861 | stream_putc(s, |
3862 | BGP_ATTR_FLAG_OPTIONAL | |
3863 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3864 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3865 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3866 | } |
d62a17ae | 3867 | stream_put(s, attr->community->val, attr->community->size * 4); |
3868 | } | |
3869 | ||
3870 | /* | |
3871 | * Large Community attribute. | |
3872 | */ | |
3873 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3874 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3875 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3876 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3877 | stream_putc(s, |
3878 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3879 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3880 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3881 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3882 | } else { |
996c9314 LB |
3883 | stream_putc(s, |
3884 | BGP_ATTR_FLAG_OPTIONAL | |
3885 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3886 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3887 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3888 | } |
d62a17ae | 3889 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3890 | lcom_length(attr->lcommunity)); |
d62a17ae | 3891 | } |
4372df71 | 3892 | |
d62a17ae | 3893 | /* Route Reflector. */ |
3894 | if (peer->sort == BGP_PEER_IBGP && from | |
3895 | && from->sort == BGP_PEER_IBGP) { | |
3896 | /* Originator ID. */ | |
3897 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3898 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3899 | stream_putc(s, 4); | |
3900 | ||
3901 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3902 | stream_put_in_addr(s, &attr->originator_id); | |
3903 | else | |
3904 | stream_put_in_addr(s, &from->remote_id); | |
3905 | ||
3906 | /* Cluster list. */ | |
3907 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3908 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3909 | ||
3910 | if (attr->cluster) { | |
3911 | stream_putc(s, attr->cluster->length + 4); | |
3912 | /* If this peer configuration's parent BGP has | |
3913 | * cluster_id. */ | |
3914 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3915 | stream_put_in_addr(s, &bgp->cluster_id); | |
3916 | else | |
3917 | stream_put_in_addr(s, &bgp->router_id); | |
3918 | stream_put(s, attr->cluster->list, | |
3919 | attr->cluster->length); | |
3920 | } else { | |
3921 | stream_putc(s, 4); | |
3922 | /* If this peer configuration's parent BGP has | |
3923 | * cluster_id. */ | |
3924 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3925 | stream_put_in_addr(s, &bgp->cluster_id); | |
3926 | else | |
3927 | stream_put_in_addr(s, &bgp->router_id); | |
3928 | } | |
3929 | } | |
4372df71 | 3930 | |
d62a17ae | 3931 | /* Extended Communities attribute. */ |
3932 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3933 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3934 | if (peer->sort == BGP_PEER_IBGP | |
3935 | || peer->sort == BGP_PEER_CONFED) { | |
3936 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
3937 | stream_putc(s, |
3938 | BGP_ATTR_FLAG_OPTIONAL | |
3939 | | BGP_ATTR_FLAG_TRANS | |
3940 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3941 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3942 | stream_putw(s, attr->ecommunity->size * 8); | |
3943 | } else { | |
996c9314 LB |
3944 | stream_putc(s, |
3945 | BGP_ATTR_FLAG_OPTIONAL | |
3946 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3947 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3948 | stream_putc(s, attr->ecommunity->size * 8); | |
3949 | } | |
3950 | stream_put(s, attr->ecommunity->val, | |
3951 | attr->ecommunity->size * 8); | |
3952 | } else { | |
d7c0a89a | 3953 | uint8_t *pnt; |
d62a17ae | 3954 | int tbit; |
3955 | int ecom_tr_size = 0; | |
3956 | int i; | |
3957 | ||
3958 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3959 | pnt = attr->ecommunity->val + (i * 8); | |
3960 | tbit = *pnt; | |
3961 | ||
3962 | if (CHECK_FLAG(tbit, | |
3963 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3964 | continue; | |
3965 | ||
3966 | ecom_tr_size++; | |
3967 | } | |
3968 | ||
3969 | if (ecom_tr_size) { | |
3970 | if (ecom_tr_size * 8 > 255) { | |
3971 | stream_putc( | |
3972 | s, | |
3973 | BGP_ATTR_FLAG_OPTIONAL | |
3974 | | BGP_ATTR_FLAG_TRANS | |
3975 | | BGP_ATTR_FLAG_EXTLEN); | |
3976 | stream_putc(s, | |
3977 | BGP_ATTR_EXT_COMMUNITIES); | |
3978 | stream_putw(s, ecom_tr_size * 8); | |
3979 | } else { | |
3980 | stream_putc( | |
3981 | s, | |
3982 | BGP_ATTR_FLAG_OPTIONAL | |
3983 | | BGP_ATTR_FLAG_TRANS); | |
3984 | stream_putc(s, | |
3985 | BGP_ATTR_EXT_COMMUNITIES); | |
3986 | stream_putc(s, ecom_tr_size * 8); | |
3987 | } | |
3988 | ||
3989 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3990 | pnt = attr->ecommunity->val + (i * 8); | |
3991 | tbit = *pnt; | |
3992 | ||
3993 | if (CHECK_FLAG( | |
3994 | tbit, | |
3995 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3996 | continue; | |
3997 | ||
3998 | stream_put(s, pnt, 8); | |
3999 | } | |
4000 | } | |
4001 | } | |
4002 | } | |
4372df71 | 4003 | |
d62a17ae | 4004 | /* Label index attribute. */ |
4005 | if (safi == SAFI_LABELED_UNICAST) { | |
4006 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4007 | uint32_t label_index; |
d62a17ae | 4008 | |
4009 | label_index = attr->label_index; | |
4010 | ||
4011 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4012 | stream_putc(s, |
4013 | BGP_ATTR_FLAG_OPTIONAL | |
4014 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4015 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4016 | stream_putc(s, 10); | |
4017 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4018 | stream_putw(s, | |
4019 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4020 | stream_putc(s, 0); // reserved | |
4021 | stream_putw(s, 0); // flags | |
4022 | stream_putl(s, label_index); | |
4023 | } | |
4372df71 | 4024 | } |
d62a17ae | 4025 | } |
4026 | ||
e496b420 HS |
4027 | /* SRv6 Service Information Attribute. */ |
4028 | if (afi == AFI_IP && safi == SAFI_MPLS_VPN) { | |
4029 | if (attr->srv6_l3vpn) { | |
4030 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4031 | | BGP_ATTR_FLAG_TRANS); | |
4032 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4033 | stream_putc(s, 24); /* tlv len */ | |
4034 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); | |
4035 | stream_putw(s, 21); /* sub-tlv len */ | |
4036 | stream_putc(s, 0); /* reserved */ | |
4037 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4038 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4039 | stream_putc(s, 0); /* sid_flags */ | |
4040 | stream_putw(s, 0xffff); /* endpoint */ | |
4041 | stream_putc(s, 0); /* reserved */ | |
4042 | } else if (attr->srv6_vpn) { | |
4043 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4044 | | BGP_ATTR_FLAG_TRANS); | |
4045 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4046 | stream_putc(s, 22); /* tlv len */ | |
4047 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4048 | stream_putw(s, 0x13); /* tlv len */ | |
4049 | stream_putc(s, 0x00); /* reserved */ | |
4050 | stream_putc(s, 0x01); /* sid_type */ | |
4051 | stream_putc(s, 0x00); /* sif_flags */ | |
4052 | stream_put(s, &attr->srv6_vpn->sid, | |
4053 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4054 | } | |
4055 | } | |
4056 | ||
d62a17ae | 4057 | if (send_as4_path) { |
4058 | /* If the peer is NOT As4 capable, AND */ | |
4059 | /* there are ASnums > 65535 in path THEN | |
4060 | * give out AS4_PATH */ | |
4061 | ||
4062 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4063 | * path segments! | |
4064 | * Hm, I wonder... confederation things *should* only be at | |
4065 | * the beginning of an aspath, right? Then we should use | |
4066 | * aspath_delete_confed_seq for this, because it is already | |
4067 | * there! (JK) | |
4068 | * Folks, talk to me: what is reasonable here!? | |
4069 | */ | |
4070 | aspath = aspath_delete_confed_seq(aspath); | |
4071 | ||
996c9314 LB |
4072 | stream_putc(s, |
4073 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4074 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4075 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4076 | aspath_sizep = stream_get_endp(s); | |
4077 | stream_putw(s, 0); | |
4078 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4079 | } | |
4080 | ||
4081 | if (aspath != attr->aspath) | |
4082 | aspath_free(aspath); | |
4083 | ||
4084 | if (send_as4_aggregator) { | |
4085 | /* send AS4_AGGREGATOR, at this place */ | |
4086 | /* this section of code moved here in order to ensure the | |
4087 | * correct | |
4088 | * *ascending* order of attributes | |
4089 | */ | |
4090 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4091 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4092 | stream_putc(s, 8); | |
4093 | stream_putl(s, attr->aggregator_as); | |
4094 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4095 | } | |
4096 | ||
4097 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4098 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4099 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4100 | /* Tunnel Encap attribute */ | |
4101 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4102 | |
1e20238a | 4103 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4104 | /* VNC attribute */ |
4105 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4106 | #endif |
d62a17ae | 4107 | } |
587ff0fd | 4108 | |
a21bd7a3 DW |
4109 | /* PMSI Tunnel */ |
4110 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4111 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4112 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4113 | stream_putc(s, 9); // Length | |
4114 | stream_putc(s, 0); // Flags | |
d03239d0 | 4115 | stream_putc(s, attr->pmsi_tnl_type); |
996c9314 LB |
4116 | stream_put(s, &(attr->label), |
4117 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4118 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4119 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4120 | } |
4121 | ||
d62a17ae | 4122 | /* Unknown transit attribute. */ |
4123 | if (attr->transit) | |
4124 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 4125 | |
d62a17ae | 4126 | /* Return total size of attribute. */ |
4127 | return stream_get_endp(s) - cp; | |
718e3744 | 4128 | } |
4129 | ||
d62a17ae | 4130 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4131 | { |
d62a17ae | 4132 | unsigned long attrlen_pnt; |
4133 | iana_afi_t pkt_afi; | |
5c525538 | 4134 | iana_safi_t pkt_safi; |
718e3744 | 4135 | |
d62a17ae | 4136 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4137 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4138 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4139 | |
d62a17ae | 4140 | attrlen_pnt = stream_get_endp(s); |
4141 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4142 | |
d62a17ae | 4143 | /* Convert AFI, SAFI to values for packet. */ |
4144 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4145 | |
d62a17ae | 4146 | stream_putw(s, pkt_afi); |
4147 | stream_putc(s, pkt_safi); | |
9cabb64b | 4148 | |
d62a17ae | 4149 | return attrlen_pnt; |
8c71e481 | 4150 | } |
718e3744 | 4151 | |
5f040085 DS |
4152 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4153 | afi_t afi, safi_t safi, | |
4154 | const struct prefix_rd *prd, | |
d7c0a89a QY |
4155 | mpls_label_t *label, uint32_t num_labels, |
4156 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 4157 | struct attr *attr) |
8c71e481 | 4158 | { |
d7c0a89a | 4159 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 4160 | |
b57ba6d2 | 4161 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4162 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4163 | num_labels = 1; |
4164 | } | |
cd1964ff | 4165 | |
d90b788e A |
4166 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
4167 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 4168 | } |
718e3744 | 4169 | |
d62a17ae | 4170 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4171 | { |
d62a17ae | 4172 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4173 | } |
4174 | ||
4175 | /* Initialization of attribute. */ | |
d62a17ae | 4176 | void bgp_attr_init(void) |
718e3744 | 4177 | { |
d62a17ae | 4178 | aspath_init(); |
4179 | attrhash_init(); | |
4180 | community_init(); | |
4181 | ecommunity_init(); | |
4182 | lcommunity_init(); | |
4183 | cluster_init(); | |
4184 | transit_init(); | |
4185 | encap_init(); | |
e496b420 | 4186 | srv6_init(); |
718e3744 | 4187 | } |
4188 | ||
d62a17ae | 4189 | void bgp_attr_finish(void) |
228da428 | 4190 | { |
d62a17ae | 4191 | aspath_finish(); |
4192 | attrhash_finish(); | |
4193 | community_finish(); | |
4194 | ecommunity_finish(); | |
4195 | lcommunity_finish(); | |
4196 | cluster_finish(); | |
4197 | transit_finish(); | |
4198 | encap_finish(); | |
e496b420 | 4199 | srv6_finish(); |
228da428 CC |
4200 | } |
4201 | ||
718e3744 | 4202 | /* Make attribute packet. */ |
d62a17ae | 4203 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
bd494ec5 | 4204 | const struct prefix *prefix) |
d62a17ae | 4205 | { |
4206 | unsigned long cp; | |
4207 | unsigned long len; | |
4208 | size_t aspath_lenp; | |
4209 | struct aspath *aspath; | |
4210 | int addpath_encode = 0; | |
d7c0a89a | 4211 | uint32_t addpath_tx_id = 0; |
d62a17ae | 4212 | |
4213 | /* Remember current pointer. */ | |
4214 | cp = stream_get_endp(s); | |
4215 | ||
4216 | /* Place holder of length. */ | |
4217 | stream_putw(s, 0); | |
4218 | ||
4219 | /* Origin attribute. */ | |
4220 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4221 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4222 | stream_putc(s, 1); | |
4223 | stream_putc(s, attr->origin); | |
4224 | ||
4225 | aspath = attr->aspath; | |
4226 | ||
4227 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4228 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4229 | aspath_lenp = stream_get_endp(s); | |
4230 | stream_putw(s, 0); | |
4231 | ||
4232 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4233 | ||
4234 | /* Nexthop attribute. */ | |
4235 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4236 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4237 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4238 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4239 | stream_putc(s, 4); | |
4240 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4241 | } |
d62a17ae | 4242 | |
4243 | /* MED attribute. */ | |
4244 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4245 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4246 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4247 | stream_putc(s, 4); | |
4248 | stream_putl(s, attr->med); | |
4249 | } | |
4250 | ||
4251 | /* Local preference. */ | |
4252 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4253 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4254 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4255 | stream_putc(s, 4); | |
4256 | stream_putl(s, attr->local_pref); | |
4257 | } | |
4258 | ||
4259 | /* Atomic aggregate. */ | |
4260 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4261 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4262 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4263 | stream_putc(s, 0); | |
4264 | } | |
4265 | ||
4266 | /* Aggregator. */ | |
4267 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4268 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4269 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4270 | stream_putc(s, 8); | |
4271 | stream_putl(s, attr->aggregator_as); | |
4272 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4273 | } | |
4274 | ||
4275 | /* Community attribute. */ | |
4276 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
4277 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4278 | stream_putc(s, |
4279 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4280 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4281 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4282 | stream_putw(s, attr->community->size * 4); | |
4283 | } else { | |
996c9314 LB |
4284 | stream_putc(s, |
4285 | BGP_ATTR_FLAG_OPTIONAL | |
4286 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4287 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4288 | stream_putc(s, attr->community->size * 4); | |
4289 | } | |
4290 | stream_put(s, attr->community->val, attr->community->size * 4); | |
4291 | } | |
4292 | ||
4293 | /* Large Community attribute. */ | |
4294 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 4295 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4296 | stream_putc(s, |
4297 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4298 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4299 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4300 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4301 | } else { |
996c9314 LB |
4302 | stream_putc(s, |
4303 | BGP_ATTR_FLAG_OPTIONAL | |
4304 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4305 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4306 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4307 | } |
4308 | ||
996c9314 LB |
4309 | stream_put(s, attr->lcommunity->val, |
4310 | lcom_length(attr->lcommunity)); | |
d62a17ae | 4311 | } |
4312 | ||
4313 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
4314 | if (prefix != NULL && prefix->family == AF_INET6 | |
4315 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
4316 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
4317 | int sizep; | |
4318 | ||
4319 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4320 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
4321 | sizep = stream_get_endp(s); | |
4322 | ||
4323 | /* MP header */ | |
4324 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
4325 | stream_putw(s, AFI_IP6); /* AFI */ | |
4326 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
4327 | ||
4328 | /* Next hop */ | |
4329 | stream_putc(s, attr->mp_nexthop_len); | |
4330 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
4331 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
4332 | stream_put(s, &attr->mp_nexthop_local, | |
4333 | IPV6_MAX_BYTELEN); | |
4334 | ||
4335 | /* SNPA */ | |
4336 | stream_putc(s, 0); | |
4337 | ||
4338 | /* Prefix */ | |
4339 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
4340 | addpath_tx_id); | |
4341 | ||
4342 | /* Set MP attribute length. */ | |
4343 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
4344 | } | |
4345 | ||
4346 | /* Prefix SID */ | |
4347 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
4348 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4349 | stream_putc(s, |
4350 | BGP_ATTR_FLAG_OPTIONAL | |
4351 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4352 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4353 | stream_putc(s, 10); | |
4354 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4355 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4356 | stream_putc(s, 0); // reserved | |
4357 | stream_putw(s, 0); // flags | |
4358 | stream_putl(s, attr->label_index); | |
4359 | } | |
4360 | } | |
4361 | ||
4362 | /* Return total size of attribute. */ | |
4363 | len = stream_get_endp(s) - cp - 2; | |
4364 | stream_putw_at(s, cp, len); | |
718e3744 | 4365 | } |