]>
Commit | Line | Data |
---|---|---|
718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
718e3744 | 35 | |
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_attr.h" | |
38 | #include "bgpd/bgp_route.h" | |
39 | #include "bgpd/bgp_aspath.h" | |
40 | #include "bgpd/bgp_community.h" | |
41 | #include "bgpd/bgp_debug.h" | |
14454c9f | 42 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 43 | #include "bgpd/bgp_label.h" |
718e3744 | 44 | #include "bgpd/bgp_packet.h" |
45 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 46 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 47 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 48 | #include "bgpd/bgp_encap_types.h" |
65efcfce | 49 | #if ENABLE_BGP_VNC |
d62a17ae | 50 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
51 | #include "bgp_encap_types.h" | |
52 | #include "bgp_vnc_types.h" | |
65efcfce | 53 | #endif |
b18825eb | 54 | #include "bgp_evpn.h" |
7c40bf39 | 55 | #include "bgp_flowspec_private.h" |
eee353c5 | 56 | #include "bgp_mac.h" |
6b0655a2 | 57 | |
718e3744 | 58 | /* Attribute strings for logging. */ |
d62a17ae | 59 | static const struct message attr_str[] = { |
60 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
61 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
62 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
63 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
64 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
65 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
66 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
67 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
68 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
69 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
70 | {BGP_ATTR_DPA, "DPA"}, | |
71 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
72 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
73 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
74 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
75 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
76 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
77 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
78 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 79 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 80 | {BGP_ATTR_ENCAP, "ENCAP"}, |
943d595a | 81 | #if ENABLE_BGP_VNC_ATTR |
d62a17ae | 82 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 83 | #endif |
d62a17ae | 84 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
85 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
86 | {0}}; | |
afcb7679 | 87 | |
996c9314 LB |
88 | static const struct message attr_flag_str[] = { |
89 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
90 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
91 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
92 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
93 | this list */ | |
94 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
95 | {0}}; | |
6b0655a2 | 96 | |
9bddac4b | 97 | static struct hash *cluster_hash; |
718e3744 | 98 | |
d62a17ae | 99 | static void *cluster_hash_alloc(void *p) |
718e3744 | 100 | { |
d62a17ae | 101 | const struct cluster_list *val = (const struct cluster_list *)p; |
102 | struct cluster_list *cluster; | |
718e3744 | 103 | |
d62a17ae | 104 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
105 | cluster->length = val->length; | |
718e3744 | 106 | |
d62a17ae | 107 | if (cluster->length) { |
108 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
109 | memcpy(cluster->list, val->list, val->length); | |
110 | } else | |
111 | cluster->list = NULL; | |
718e3744 | 112 | |
d62a17ae | 113 | cluster->refcnt = 0; |
718e3744 | 114 | |
d62a17ae | 115 | return cluster; |
718e3744 | 116 | } |
117 | ||
118 | /* Cluster list related functions. */ | |
d62a17ae | 119 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 120 | { |
d62a17ae | 121 | struct cluster_list tmp; |
122 | struct cluster_list *cluster; | |
718e3744 | 123 | |
d62a17ae | 124 | tmp.length = length; |
125 | tmp.list = pnt; | |
718e3744 | 126 | |
d62a17ae | 127 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
128 | cluster->refcnt++; | |
129 | return cluster; | |
718e3744 | 130 | } |
131 | ||
d62a17ae | 132 | int cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 133 | { |
d62a17ae | 134 | int i; |
135 | ||
136 | for (i = 0; i < cluster->length / 4; i++) | |
137 | if (cluster->list[i].s_addr == originator.s_addr) | |
138 | return 1; | |
139 | return 0; | |
718e3744 | 140 | } |
141 | ||
d8b87afe | 142 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 143 | { |
d62a17ae | 144 | const struct cluster_list *cluster = p; |
718e3744 | 145 | |
d62a17ae | 146 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 147 | } |
148 | ||
74df8d6d | 149 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 150 | { |
d62a17ae | 151 | const struct cluster_list *cluster1 = p1; |
152 | const struct cluster_list *cluster2 = p2; | |
923de654 | 153 | |
d62a17ae | 154 | return (cluster1->length == cluster2->length |
155 | && memcmp(cluster1->list, cluster2->list, cluster1->length) | |
156 | == 0); | |
718e3744 | 157 | } |
158 | ||
d62a17ae | 159 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 160 | { |
0a22ddfb | 161 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 162 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 163 | } |
164 | ||
d62a17ae | 165 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 166 | { |
d62a17ae | 167 | struct cluster_list *find; |
718e3744 | 168 | |
d62a17ae | 169 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
170 | find->refcnt++; | |
718e3744 | 171 | |
d62a17ae | 172 | return find; |
718e3744 | 173 | } |
174 | ||
d62a17ae | 175 | void cluster_unintern(struct cluster_list *cluster) |
718e3744 | 176 | { |
d62a17ae | 177 | if (cluster->refcnt) |
178 | cluster->refcnt--; | |
718e3744 | 179 | |
d62a17ae | 180 | if (cluster->refcnt == 0) { |
181 | hash_release(cluster_hash, cluster); | |
182 | cluster_free(cluster); | |
183 | } | |
718e3744 | 184 | } |
185 | ||
d62a17ae | 186 | static void cluster_init(void) |
718e3744 | 187 | { |
996c9314 | 188 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 189 | "BGP Cluster"); |
718e3744 | 190 | } |
228da428 | 191 | |
d62a17ae | 192 | static void cluster_finish(void) |
228da428 | 193 | { |
d62a17ae | 194 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
195 | hash_free(cluster_hash); | |
196 | cluster_hash = NULL; | |
228da428 | 197 | } |
6b0655a2 | 198 | |
bede7744 LB |
199 | static struct hash *encap_hash = NULL; |
200 | #if ENABLE_BGP_VNC | |
201 | static struct hash *vnc_hash = NULL; | |
202 | #endif | |
203 | ||
d62a17ae | 204 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 205 | { |
d62a17ae | 206 | struct bgp_attr_encap_subtlv *new; |
207 | struct bgp_attr_encap_subtlv *tail; | |
208 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 209 | |
d62a17ae | 210 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 211 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 212 | if (tail) { |
213 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
214 | tail = tail->next; | |
215 | } else { | |
216 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
217 | } | |
218 | assert(tail); | |
219 | memcpy(tail, p, size); | |
220 | tail->next = NULL; | |
f4c89855 | 221 | } |
f4c89855 | 222 | |
d62a17ae | 223 | return new; |
f4c89855 LB |
224 | } |
225 | ||
d62a17ae | 226 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 227 | { |
d62a17ae | 228 | struct bgp_attr_encap_subtlv *next; |
229 | while (p) { | |
230 | next = p->next; | |
231 | p->next = NULL; | |
232 | XFREE(MTYPE_ENCAP_TLV, p); | |
233 | p = next; | |
234 | } | |
f4c89855 LB |
235 | } |
236 | ||
d62a17ae | 237 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 238 | { |
d62a17ae | 239 | if (!attr) |
240 | return; | |
f4c89855 | 241 | |
d62a17ae | 242 | if (attr->encap_subtlvs) { |
243 | encap_free(attr->encap_subtlvs); | |
244 | attr->encap_subtlvs = NULL; | |
245 | } | |
65efcfce | 246 | #if ENABLE_BGP_VNC |
d62a17ae | 247 | if (attr->vnc_subtlvs) { |
248 | encap_free(attr->vnc_subtlvs); | |
249 | attr->vnc_subtlvs = NULL; | |
250 | } | |
65efcfce | 251 | #endif |
f4c89855 LB |
252 | } |
253 | ||
254 | /* | |
255 | * Compare encap sub-tlv chains | |
256 | * | |
257 | * 1 = equivalent | |
258 | * 0 = not equivalent | |
259 | * | |
260 | * This algorithm could be made faster if needed | |
261 | */ | |
36de6e0e A |
262 | static int encap_same(const struct bgp_attr_encap_subtlv *h1, |
263 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 264 | { |
36de6e0e A |
265 | const struct bgp_attr_encap_subtlv *p; |
266 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 267 | |
d62a17ae | 268 | if (h1 == h2) |
269 | return 1; | |
270 | if (h1 == NULL || h2 == NULL) | |
271 | return 0; | |
f4c89855 | 272 | |
d62a17ae | 273 | for (p = h1; p; p = p->next) { |
274 | for (q = h2; q; q = q->next) { | |
275 | if ((p->type == q->type) && (p->length == q->length) | |
276 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 277 | |
d62a17ae | 278 | break; |
279 | } | |
280 | } | |
281 | if (!q) | |
282 | return 0; | |
f4c89855 | 283 | } |
f4c89855 | 284 | |
d62a17ae | 285 | for (p = h2; p; p = p->next) { |
286 | for (q = h1; q; q = q->next) { | |
287 | if ((p->type == q->type) && (p->length == q->length) | |
288 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 289 | |
d62a17ae | 290 | break; |
291 | } | |
292 | } | |
293 | if (!q) | |
294 | return 0; | |
f4c89855 | 295 | } |
f4c89855 | 296 | |
d62a17ae | 297 | return 1; |
f4c89855 LB |
298 | } |
299 | ||
d62a17ae | 300 | static void *encap_hash_alloc(void *p) |
bede7744 | 301 | { |
d62a17ae | 302 | /* Encap structure is already allocated. */ |
303 | return p; | |
bede7744 LB |
304 | } |
305 | ||
d62a17ae | 306 | typedef enum { |
307 | ENCAP_SUBTLV_TYPE, | |
bede7744 | 308 | #if ENABLE_BGP_VNC |
d62a17ae | 309 | VNC_SUBTLV_TYPE |
bede7744 LB |
310 | #endif |
311 | } encap_subtlv_type; | |
312 | ||
313 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 314 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 315 | { |
d62a17ae | 316 | struct bgp_attr_encap_subtlv *find; |
317 | struct hash *hash = encap_hash; | |
bede7744 | 318 | #if ENABLE_BGP_VNC |
d62a17ae | 319 | if (type == VNC_SUBTLV_TYPE) |
320 | hash = vnc_hash; | |
bede7744 LB |
321 | #endif |
322 | ||
d62a17ae | 323 | find = hash_get(hash, encap, encap_hash_alloc); |
324 | if (find != encap) | |
325 | encap_free(encap); | |
326 | find->refcnt++; | |
bede7744 | 327 | |
d62a17ae | 328 | return find; |
bede7744 LB |
329 | } |
330 | ||
d62a17ae | 331 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
332 | encap_subtlv_type type) | |
bede7744 | 333 | { |
d62a17ae | 334 | struct bgp_attr_encap_subtlv *encap = *encapp; |
335 | if (encap->refcnt) | |
336 | encap->refcnt--; | |
bede7744 | 337 | |
d62a17ae | 338 | if (encap->refcnt == 0) { |
339 | struct hash *hash = encap_hash; | |
bede7744 | 340 | #if ENABLE_BGP_VNC |
d62a17ae | 341 | if (type == VNC_SUBTLV_TYPE) |
342 | hash = vnc_hash; | |
bede7744 | 343 | #endif |
d62a17ae | 344 | hash_release(hash, encap); |
345 | encap_free(encap); | |
346 | *encapp = NULL; | |
347 | } | |
bede7744 LB |
348 | } |
349 | ||
d8b87afe | 350 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 351 | { |
d62a17ae | 352 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 353 | |
d62a17ae | 354 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
355 | } |
356 | ||
74df8d6d | 357 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 358 | { |
36de6e0e A |
359 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
360 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
361 | } |
362 | ||
d62a17ae | 363 | static void encap_init(void) |
bede7744 | 364 | { |
996c9314 | 365 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 366 | "BGP Encap Hash"); |
bede7744 | 367 | #if ENABLE_BGP_VNC |
996c9314 | 368 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 369 | "BGP VNC Hash"); |
bede7744 LB |
370 | #endif |
371 | } | |
372 | ||
d62a17ae | 373 | static void encap_finish(void) |
bede7744 | 374 | { |
d62a17ae | 375 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
376 | hash_free(encap_hash); | |
377 | encap_hash = NULL; | |
bede7744 | 378 | #if ENABLE_BGP_VNC |
d62a17ae | 379 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
380 | hash_free(vnc_hash); | |
381 | vnc_hash = NULL; | |
bede7744 LB |
382 | #endif |
383 | } | |
384 | ||
d62a17ae | 385 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 386 | { |
d62a17ae | 387 | if (!a1 && a2) |
388 | return false; | |
389 | if (!a2 && a1) | |
390 | return false; | |
391 | if (!a1 && !a2) | |
392 | return true; | |
393 | return !memcmp(&(a1->evpn_overlay), &(a2->evpn_overlay), | |
ea7741a0 | 394 | sizeof(struct bgp_route_evpn)); |
684a7227 PG |
395 | } |
396 | ||
718e3744 | 397 | /* Unknown transit attribute. */ |
9bddac4b | 398 | static struct hash *transit_hash; |
718e3744 | 399 | |
d62a17ae | 400 | static void transit_free(struct transit *transit) |
718e3744 | 401 | { |
0a22ddfb | 402 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 403 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 404 | } |
405 | ||
d62a17ae | 406 | static void *transit_hash_alloc(void *p) |
718e3744 | 407 | { |
d62a17ae | 408 | /* Transit structure is already allocated. */ |
409 | return p; | |
718e3744 | 410 | } |
411 | ||
d62a17ae | 412 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 413 | { |
d62a17ae | 414 | struct transit *find; |
718e3744 | 415 | |
d62a17ae | 416 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
417 | if (find != transit) | |
418 | transit_free(transit); | |
419 | find->refcnt++; | |
718e3744 | 420 | |
d62a17ae | 421 | return find; |
718e3744 | 422 | } |
423 | ||
d62a17ae | 424 | void transit_unintern(struct transit *transit) |
718e3744 | 425 | { |
d62a17ae | 426 | if (transit->refcnt) |
427 | transit->refcnt--; | |
718e3744 | 428 | |
d62a17ae | 429 | if (transit->refcnt == 0) { |
430 | hash_release(transit_hash, transit); | |
431 | transit_free(transit); | |
432 | } | |
718e3744 | 433 | } |
434 | ||
d8b87afe | 435 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 436 | { |
d62a17ae | 437 | const struct transit *transit = p; |
718e3744 | 438 | |
d62a17ae | 439 | return jhash(transit->val, transit->length, 0); |
718e3744 | 440 | } |
441 | ||
74df8d6d | 442 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 443 | { |
d62a17ae | 444 | const struct transit *transit1 = p1; |
445 | const struct transit *transit2 = p2; | |
923de654 | 446 | |
d62a17ae | 447 | return (transit1->length == transit2->length |
448 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 449 | } |
450 | ||
d62a17ae | 451 | static void transit_init(void) |
718e3744 | 452 | { |
996c9314 | 453 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 454 | "BGP Transit Hash"); |
718e3744 | 455 | } |
228da428 | 456 | |
d62a17ae | 457 | static void transit_finish(void) |
228da428 | 458 | { |
d62a17ae | 459 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
460 | hash_free(transit_hash); | |
461 | transit_hash = NULL; | |
228da428 | 462 | } |
6b0655a2 | 463 | |
718e3744 | 464 | /* Attribute hash routines. */ |
9bddac4b | 465 | static struct hash *attrhash; |
718e3744 | 466 | |
fb982c25 PJ |
467 | /* Shallow copy of an attribute |
468 | * Though, not so shallow that it doesn't copy the contents | |
469 | * of the attr_extra pointed to by 'extra' | |
470 | */ | |
d62a17ae | 471 | void bgp_attr_dup(struct attr *new, struct attr *orig) |
fb982c25 | 472 | { |
d62a17ae | 473 | *new = *orig; |
fb982c25 PJ |
474 | } |
475 | ||
d62a17ae | 476 | unsigned long int attr_count(void) |
cbdfbaa5 | 477 | { |
d62a17ae | 478 | return attrhash->count; |
cbdfbaa5 PJ |
479 | } |
480 | ||
d62a17ae | 481 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 482 | { |
d62a17ae | 483 | return transit_hash->count; |
cbdfbaa5 PJ |
484 | } |
485 | ||
d8b87afe | 486 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 487 | { |
d62a17ae | 488 | const struct attr *attr = (struct attr *)p; |
489 | uint32_t key = 0; | |
c8e7b895 | 490 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 491 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 492 | |
0d0268a6 | 493 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
494 | MIX3(attr->local_pref, attr->aggregator_as, |
495 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
496 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
497 | attr->originator_id.s_addr); | |
498 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 499 | |
500 | if (attr->aspath) | |
501 | MIX(aspath_key_make(attr->aspath)); | |
502 | if (attr->community) | |
503 | MIX(community_hash_make(attr->community)); | |
504 | ||
505 | if (attr->lcommunity) | |
506 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
507 | if (attr->ecommunity) | |
508 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
509 | if (attr->cluster) | |
510 | MIX(cluster_hash_key_make(attr->cluster)); | |
511 | if (attr->transit) | |
512 | MIX(transit_hash_key_make(attr->transit)); | |
513 | if (attr->encap_subtlvs) | |
514 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
bede7744 | 515 | #if ENABLE_BGP_VNC |
d62a17ae | 516 | if (attr->vnc_subtlvs) |
517 | MIX(encap_hash_key_make(attr->vnc_subtlvs)); | |
bede7744 | 518 | #endif |
d62a17ae | 519 | MIX(attr->mp_nexthop_len); |
520 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
521 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
77e62f2b | 522 | MIX(attr->nh_ifindex); |
523 | MIX(attr->nh_lla_ifindex); | |
d62a17ae | 524 | |
525 | return key; | |
526 | } | |
527 | ||
74df8d6d | 528 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 529 | { |
530 | const struct attr *attr1 = p1; | |
531 | const struct attr *attr2 = p2; | |
532 | ||
533 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
534 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
535 | && attr1->aspath == attr2->aspath | |
536 | && attr1->community == attr2->community && attr1->med == attr2->med | |
537 | && attr1->local_pref == attr2->local_pref | |
538 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
539 | if (attr1->aggregator_as == attr2->aggregator_as | |
540 | && attr1->aggregator_addr.s_addr | |
541 | == attr2->aggregator_addr.s_addr | |
542 | && attr1->weight == attr2->weight | |
543 | && attr1->tag == attr2->tag | |
544 | && attr1->label_index == attr2->label_index | |
545 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 546 | && attr1->ecommunity == attr2->ecommunity |
547 | && attr1->lcommunity == attr2->lcommunity | |
548 | && attr1->cluster == attr2->cluster | |
549 | && attr1->transit == attr2->transit | |
550 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) | |
551 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
65efcfce | 552 | #if ENABLE_BGP_VNC |
d62a17ae | 553 | && encap_same(attr1->vnc_subtlvs, attr2->vnc_subtlvs) |
65efcfce | 554 | #endif |
0d0268a6 LB |
555 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
556 | &attr2->mp_nexthop_global) | |
557 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
558 | &attr2->mp_nexthop_local) | |
559 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
560 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 561 | && IPV4_ADDR_SAME(&attr1->originator_id, |
562 | &attr2->originator_id) | |
77e62f2b | 563 | && overlay_index_same(attr1, attr2) |
564 | && attr1->nh_ifindex == attr2->nh_ifindex | |
565 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex) | |
74df8d6d | 566 | return true; |
d62a17ae | 567 | } |
aadc0905 | 568 | |
74df8d6d | 569 | return false; |
718e3744 | 570 | } |
571 | ||
d62a17ae | 572 | static void attrhash_init(void) |
718e3744 | 573 | { |
996c9314 LB |
574 | attrhash = |
575 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 576 | } |
577 | ||
289d2501 LB |
578 | /* |
579 | * special for hash_clean below | |
580 | */ | |
d62a17ae | 581 | static void attr_vfree(void *attr) |
289d2501 | 582 | { |
d62a17ae | 583 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
584 | } |
585 | ||
d62a17ae | 586 | static void attrhash_finish(void) |
228da428 | 587 | { |
d62a17ae | 588 | hash_clean(attrhash, attr_vfree); |
589 | hash_free(attrhash); | |
590 | attrhash = NULL; | |
228da428 CC |
591 | } |
592 | ||
e3b78da8 | 593 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 594 | { |
e3b78da8 | 595 | struct attr *attr = bucket->data; |
718e3744 | 596 | |
d62a17ae | 597 | vty_out(vty, "attr[%ld] nexthop %s\n", attr->refcnt, |
598 | inet_ntoa(attr->nexthop)); | |
13b7e7f0 | 599 | vty_out(vty, "\tflags: %" PRIu64 " med: %u local_pref: %u origin: %u weight: %u label: %u\n", |
23a2a47e | 600 | attr->flag, attr->med, attr->local_pref, attr->origin, |
13b7e7f0 | 601 | attr->weight, attr->label); |
718e3744 | 602 | } |
603 | ||
d62a17ae | 604 | void attr_show_all(struct vty *vty) |
718e3744 | 605 | { |
e3b78da8 | 606 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
607 | void *))attr_show_all_iterator, |
608 | vty); | |
718e3744 | 609 | } |
610 | ||
d62a17ae | 611 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 612 | { |
d62a17ae | 613 | struct attr *val = (struct attr *)p; |
614 | struct attr *attr; | |
718e3744 | 615 | |
d62a17ae | 616 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
617 | *attr = *val; | |
618 | if (val->encap_subtlvs) { | |
619 | val->encap_subtlvs = NULL; | |
620 | } | |
65efcfce | 621 | #if ENABLE_BGP_VNC |
d62a17ae | 622 | if (val->vnc_subtlvs) { |
623 | val->vnc_subtlvs = NULL; | |
624 | } | |
65efcfce | 625 | #endif |
d62a17ae | 626 | attr->refcnt = 0; |
627 | return attr; | |
718e3744 | 628 | } |
629 | ||
630 | /* Internet argument attribute. */ | |
d62a17ae | 631 | struct attr *bgp_attr_intern(struct attr *attr) |
632 | { | |
633 | struct attr *find; | |
634 | ||
635 | /* Intern referenced strucutre. */ | |
636 | if (attr->aspath) { | |
637 | if (!attr->aspath->refcnt) | |
638 | attr->aspath = aspath_intern(attr->aspath); | |
639 | else | |
640 | attr->aspath->refcnt++; | |
641 | } | |
642 | if (attr->community) { | |
643 | if (!attr->community->refcnt) | |
644 | attr->community = community_intern(attr->community); | |
645 | else | |
646 | attr->community->refcnt++; | |
647 | } | |
648 | ||
649 | if (attr->ecommunity) { | |
650 | if (!attr->ecommunity->refcnt) | |
651 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
652 | else | |
653 | attr->ecommunity->refcnt++; | |
654 | } | |
655 | if (attr->lcommunity) { | |
656 | if (!attr->lcommunity->refcnt) | |
657 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
658 | else | |
659 | attr->lcommunity->refcnt++; | |
660 | } | |
661 | if (attr->cluster) { | |
662 | if (!attr->cluster->refcnt) | |
663 | attr->cluster = cluster_intern(attr->cluster); | |
664 | else | |
665 | attr->cluster->refcnt++; | |
666 | } | |
667 | if (attr->transit) { | |
668 | if (!attr->transit->refcnt) | |
669 | attr->transit = transit_intern(attr->transit); | |
670 | else | |
671 | attr->transit->refcnt++; | |
672 | } | |
673 | if (attr->encap_subtlvs) { | |
674 | if (!attr->encap_subtlvs->refcnt) | |
675 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
676 | ENCAP_SUBTLV_TYPE); | |
677 | else | |
678 | attr->encap_subtlvs->refcnt++; | |
679 | } | |
bede7744 | 680 | #if ENABLE_BGP_VNC |
d62a17ae | 681 | if (attr->vnc_subtlvs) { |
682 | if (!attr->vnc_subtlvs->refcnt) | |
683 | attr->vnc_subtlvs = encap_intern(attr->vnc_subtlvs, | |
684 | VNC_SUBTLV_TYPE); | |
685 | else | |
686 | attr->vnc_subtlvs->refcnt++; | |
687 | } | |
aadc0905 | 688 | #endif |
bede7744 | 689 | |
dbbac180 DL |
690 | /* At this point, attr only contains intern'd pointers. that means |
691 | * if we find it in attrhash, it has all the same pointers and we | |
692 | * correctly updated the refcounts on these. | |
693 | * If we don't find it, we need to allocate a one because in all | |
694 | * cases this returns a new reference to a hashed attr, but the input | |
695 | * wasn't on hash. */ | |
d62a17ae | 696 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
697 | find->refcnt++; | |
698 | ||
699 | return find; | |
718e3744 | 700 | } |
701 | ||
702 | /* Make network statement's attribute. */ | |
d7c0a89a | 703 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 704 | { |
d62a17ae | 705 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 706 | |
d62a17ae | 707 | attr->origin = origin; |
708 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
709 | attr->aspath = aspath_empty(); | |
710 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
711 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
712 | attr->tag = 0; | |
713 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
714 | attr->label = MPLS_INVALID_LABEL; | |
715 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
716 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
717 | ||
718 | return attr; | |
718e3744 | 719 | } |
720 | ||
b5d58c32 | 721 | /* Create the attributes for an aggregate */ |
d7c0a89a | 722 | struct attr *bgp_attr_aggregate_intern(struct bgp *bgp, uint8_t origin, |
d62a17ae | 723 | struct aspath *aspath, |
3da2cc32 DS |
724 | struct community *community, |
725 | struct ecommunity *ecommunity, | |
dd18c5a9 | 726 | struct lcommunity *lcommunity, |
3da2cc32 | 727 | int as_set, uint8_t atomic_aggregate) |
d62a17ae | 728 | { |
729 | struct attr attr; | |
730 | struct attr *new; | |
731 | ||
732 | memset(&attr, 0, sizeof(struct attr)); | |
733 | ||
734 | /* Origin attribute. */ | |
735 | attr.origin = origin; | |
736 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
737 | ||
738 | /* AS path attribute. */ | |
739 | if (aspath) | |
740 | attr.aspath = aspath_intern(aspath); | |
741 | else | |
742 | attr.aspath = aspath_empty(); | |
743 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
744 | ||
745 | /* Next hop attribute. */ | |
746 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
747 | ||
748 | if (community) { | |
d7c0a89a | 749 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
750 | |
751 | /* If we are not shutting down ourselves and we are | |
752 | * aggregating a route that contains the GSHUT community we | |
753 | * need to remove that community when creating the aggregate */ | |
996c9314 LB |
754 | if (!bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN) |
755 | && community_include(community, gshut)) { | |
7f323236 DW |
756 | community_del_val(community, &gshut); |
757 | } | |
758 | ||
d62a17ae | 759 | attr.community = community; |
760 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
761 | } | |
762 | ||
3da2cc32 DS |
763 | if (ecommunity) { |
764 | attr.ecommunity = ecommunity; | |
765 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
766 | } | |
767 | ||
dd18c5a9 DS |
768 | if (lcommunity) { |
769 | attr.lcommunity = lcommunity; | |
770 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
771 | } | |
772 | ||
7f323236 DW |
773 | if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) { |
774 | bgp_attr_add_gshut_community(&attr); | |
775 | } | |
776 | ||
d62a17ae | 777 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
778 | attr.label = MPLS_INVALID_LABEL; | |
779 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
780 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
781 | if (!as_set || atomic_aggregate) | |
782 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
783 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
784 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
785 | attr.aggregator_as = bgp->confed_id; | |
786 | else | |
787 | attr.aggregator_as = bgp->as; | |
788 | attr.aggregator_addr = bgp->router_id; | |
789 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
790 | attr.label = MPLS_INVALID_LABEL; | |
791 | ||
792 | new = bgp_attr_intern(&attr); | |
793 | ||
794 | aspath_unintern(&new->aspath); | |
795 | return new; | |
718e3744 | 796 | } |
797 | ||
b881c707 | 798 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 799 | void bgp_attr_unintern_sub(struct attr *attr) |
800 | { | |
801 | /* aspath refcount shoud be decrement. */ | |
802 | if (attr->aspath) | |
803 | aspath_unintern(&attr->aspath); | |
804 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
805 | ||
806 | if (attr->community) | |
807 | community_unintern(&attr->community); | |
808 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
809 | ||
810 | if (attr->ecommunity) | |
811 | ecommunity_unintern(&attr->ecommunity); | |
812 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); | |
813 | ||
814 | if (attr->lcommunity) | |
815 | lcommunity_unintern(&attr->lcommunity); | |
816 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
817 | ||
818 | if (attr->cluster) | |
819 | cluster_unintern(attr->cluster); | |
820 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); | |
821 | ||
822 | if (attr->transit) | |
823 | transit_unintern(attr->transit); | |
824 | ||
825 | if (attr->encap_subtlvs) | |
826 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 LB |
827 | |
828 | #if ENABLE_BGP_VNC | |
d62a17ae | 829 | if (attr->vnc_subtlvs) |
830 | encap_unintern(&attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 831 | #endif |
b881c707 PJ |
832 | } |
833 | ||
f46d8e1e DS |
834 | /* |
835 | * We have some show commands that let you experimentally | |
836 | * apply a route-map. When we apply the route-map | |
837 | * we are reseting values but not saving them for | |
838 | * posterity via intern'ing( because route-maps don't | |
839 | * do that) but at this point in time we need | |
840 | * to compare the new attr to the old and if the | |
841 | * routemap has changed it we need to, as Snoop Dog says, | |
842 | * Drop it like it's hot | |
843 | */ | |
844 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
845 | { | |
846 | if (new->aspath != old->aspath) | |
847 | aspath_free(new->aspath); | |
848 | ||
849 | if (new->community != old->community) | |
3c1f53de | 850 | community_free(&new->community); |
f46d8e1e DS |
851 | |
852 | if (new->ecommunity != old->ecommunity) | |
853 | ecommunity_free(&new->ecommunity); | |
854 | ||
855 | if (new->lcommunity != old->lcommunity) | |
856 | lcommunity_free(&new->lcommunity); | |
f46d8e1e DS |
857 | } |
858 | ||
718e3744 | 859 | /* Free bgp attribute and aspath. */ |
d62a17ae | 860 | void bgp_attr_unintern(struct attr **pattr) |
861 | { | |
862 | struct attr *attr = *pattr; | |
863 | struct attr *ret; | |
864 | struct attr tmp; | |
865 | ||
866 | /* Decrement attribute reference. */ | |
867 | attr->refcnt--; | |
868 | ||
869 | tmp = *attr; | |
870 | ||
871 | /* If reference becomes zero then free attribute object. */ | |
872 | if (attr->refcnt == 0) { | |
873 | ret = hash_release(attrhash, attr); | |
874 | assert(ret != NULL); | |
875 | XFREE(MTYPE_ATTR, attr); | |
876 | *pattr = NULL; | |
877 | } | |
878 | ||
879 | bgp_attr_unintern_sub(&tmp); | |
880 | } | |
881 | ||
882 | void bgp_attr_flush(struct attr *attr) | |
883 | { | |
884 | if (attr->aspath && !attr->aspath->refcnt) { | |
885 | aspath_free(attr->aspath); | |
886 | attr->aspath = NULL; | |
887 | } | |
3c1f53de SMS |
888 | if (attr->community && !attr->community->refcnt) |
889 | community_free(&attr->community); | |
d62a17ae | 890 | if (attr->ecommunity && !attr->ecommunity->refcnt) |
891 | ecommunity_free(&attr->ecommunity); | |
892 | if (attr->lcommunity && !attr->lcommunity->refcnt) | |
893 | lcommunity_free(&attr->lcommunity); | |
894 | if (attr->cluster && !attr->cluster->refcnt) { | |
895 | cluster_free(attr->cluster); | |
896 | attr->cluster = NULL; | |
897 | } | |
898 | if (attr->transit && !attr->transit->refcnt) { | |
899 | transit_free(attr->transit); | |
900 | attr->transit = NULL; | |
901 | } | |
902 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
903 | encap_free(attr->encap_subtlvs); | |
904 | attr->encap_subtlvs = NULL; | |
905 | } | |
65efcfce | 906 | #if ENABLE_BGP_VNC |
d62a17ae | 907 | if (attr->vnc_subtlvs && !attr->vnc_subtlvs->refcnt) { |
908 | encap_free(attr->vnc_subtlvs); | |
909 | attr->vnc_subtlvs = NULL; | |
910 | } | |
aadc0905 | 911 | #endif |
718e3744 | 912 | } |
913 | ||
b881c707 PJ |
914 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
915 | * avoid resetting sessions for malformed attributes which are | |
916 | * are partial/optional and hence where the error likely was not | |
917 | * introduced by the sending neighbour. | |
918 | */ | |
919 | static bgp_attr_parse_ret_t | |
d7c0a89a | 920 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 921 | bgp_size_t length) |
922 | { | |
923 | struct peer *const peer = args->peer; | |
d7c0a89a | 924 | const uint8_t flags = args->flags; |
d62a17ae | 925 | /* startp and length must be special-cased, as whether or not to |
926 | * send the attribute data with the NOTIFY depends on the error, | |
927 | * the caller therefore signals this with the seperate length argument | |
928 | */ | |
d7c0a89a | 929 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 930 | |
931 | /* Only relax error handling for eBGP peers */ | |
932 | if (peer->sort != BGP_PEER_EBGP) { | |
933 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
934 | notify_datap, length); | |
935 | return BGP_ATTR_PARSE_ERROR; | |
936 | } | |
937 | ||
938 | /* Adjust the stream getp to the end of the attribute, in case we can | |
939 | * still proceed but the caller hasn't read all the attribute. | |
940 | */ | |
941 | stream_set_getp(BGP_INPUT(peer), | |
942 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
943 | + args->total); | |
944 | ||
945 | switch (args->type) { | |
946 | /* where an attribute is relatively inconsequential, e.g. it does not | |
947 | * affect route selection, and can be safely ignored, then any such | |
948 | * attributes which are malformed should just be ignored and the route | |
949 | * processed as normal. | |
950 | */ | |
951 | case BGP_ATTR_AS4_AGGREGATOR: | |
952 | case BGP_ATTR_AGGREGATOR: | |
953 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
954 | return BGP_ATTR_PARSE_PROCEED; | |
955 | ||
956 | /* Core attributes, particularly ones which may influence route | |
957 | * selection, should always cause session resets | |
958 | */ | |
959 | case BGP_ATTR_ORIGIN: | |
960 | case BGP_ATTR_AS_PATH: | |
961 | case BGP_ATTR_NEXT_HOP: | |
962 | case BGP_ATTR_MULTI_EXIT_DISC: | |
963 | case BGP_ATTR_LOCAL_PREF: | |
964 | case BGP_ATTR_COMMUNITIES: | |
965 | case BGP_ATTR_ORIGINATOR_ID: | |
966 | case BGP_ATTR_CLUSTER_LIST: | |
967 | case BGP_ATTR_MP_REACH_NLRI: | |
968 | case BGP_ATTR_MP_UNREACH_NLRI: | |
969 | case BGP_ATTR_EXT_COMMUNITIES: | |
970 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
971 | notify_datap, length); | |
972 | return BGP_ATTR_PARSE_ERROR; | |
973 | } | |
974 | ||
975 | /* Partial optional attributes that are malformed should not cause | |
976 | * the whole session to be reset. Instead treat it as a withdrawal | |
977 | * of the routes, if possible. | |
978 | */ | |
979 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
980 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
981 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
982 | return BGP_ATTR_PARSE_WITHDRAW; | |
983 | ||
984 | /* default to reset */ | |
985 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
986 | } |
987 | ||
afcb7679 DO |
988 | /* Find out what is wrong with the path attribute flag bits and log the error. |
989 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
990 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
991 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
992 | non-transitive" attribute. */ | |
993 | static void | |
d62a17ae | 994 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
995 | uint8_t desired_flags /* how RFC says it must be */ |
996 | ) | |
d62a17ae | 997 | { |
d7c0a89a QY |
998 | uint8_t seen = 0, i; |
999 | uint8_t real_flags = args->flags; | |
1000 | const uint8_t attr_code = args->type; | |
d62a17ae | 1001 | |
1002 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1003 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1004 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1005 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1006 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1007 | flog_err(EC_BGP_ATTR_FLAG, |
1008 | "%s attribute must%s be flagged as \"%s\"", | |
1009 | lookup_msg(attr_str, attr_code, NULL), | |
1010 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1011 | ? "" | |
1012 | : " not", | |
1013 | attr_flag_str[i].str); | |
d62a17ae | 1014 | seen = 1; |
1015 | } | |
1016 | if (!seen) { | |
1017 | zlog_debug( | |
1018 | "Strange, %s called for attr %s, but no problem found with flags" | |
1019 | " (real flags 0x%x, desired 0x%x)", | |
1020 | __func__, lookup_msg(attr_str, attr_code, NULL), | |
1021 | real_flags, desired_flags); | |
1022 | } | |
afcb7679 DO |
1023 | } |
1024 | ||
3ecab4c8 PJ |
1025 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1026 | * as will PARTIAL for optional+transitive attributes. | |
1027 | */ | |
d7c0a89a QY |
1028 | const uint8_t attr_flags_values[] = { |
1029 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1030 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1031 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1032 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1033 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1034 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1035 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1036 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1037 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1038 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1039 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1040 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1041 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1042 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1043 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1044 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1045 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1046 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1047 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1048 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1049 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1050 | }; |
099111ef | 1051 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1052 | |
d62a17ae | 1053 | static int bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
1054 | { | |
d7c0a89a QY |
1055 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1056 | const uint8_t flags = args->flags; | |
1057 | const uint8_t attr_code = args->type; | |
d62a17ae | 1058 | |
1059 | /* there may be attributes we don't know about */ | |
1060 | if (attr_code > attr_flags_values_max) | |
1061 | return 0; | |
1062 | if (attr_flags_values[attr_code] == 0) | |
1063 | return 0; | |
1064 | ||
1065 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1066 | * to | |
1067 | * 1." | |
1068 | */ | |
1069 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1070 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1071 | flog_err( |
e50f7cfd | 1072 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1073 | "%s well-known attributes must have transitive flag set (%x)", |
1074 | lookup_msg(attr_str, attr_code, NULL), flags); | |
1075 | return 1; | |
1076 | } | |
1077 | ||
1078 | /* "For well-known attributes and for optional non-transitive | |
1079 | * attributes, | |
1080 | * the Partial bit MUST be set to 0." | |
1081 | */ | |
1082 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1083 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1084 | flog_err(EC_BGP_ATTR_FLAG, |
1c50c1c0 QY |
1085 | "%s well-known attribute " |
1086 | "must NOT have the partial flag set (%x)", | |
1087 | lookup_msg(attr_str, attr_code, NULL), flags); | |
d62a17ae | 1088 | return 1; |
1089 | } | |
1090 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1091 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1092 | flog_err(EC_BGP_ATTR_FLAG, |
1c50c1c0 QY |
1093 | "%s optional + transitive attribute " |
1094 | "must NOT have the partial flag set (%x)", | |
1095 | lookup_msg(attr_str, attr_code, NULL), flags); | |
d62a17ae | 1096 | return 1; |
1097 | } | |
1098 | } | |
1099 | ||
1100 | /* Optional transitive attributes may go through speakers that don't | |
1101 | * reocgnise them and set the Partial bit. | |
1102 | */ | |
1103 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1104 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1105 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1106 | ||
1107 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
1108 | return 0; | |
1109 | ||
1110 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
1111 | return 1; | |
3ecab4c8 PJ |
1112 | } |
1113 | ||
718e3744 | 1114 | /* Get origin attribute of the update message. */ |
d62a17ae | 1115 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1116 | { | |
1117 | struct peer *const peer = args->peer; | |
1118 | struct attr *const attr = args->attr; | |
1119 | const bgp_size_t length = args->length; | |
1120 | ||
1121 | /* If any recognized attribute has Attribute Length that conflicts | |
1122 | with the expected length (based on the attribute type code), then | |
1123 | the Error Subcode is set to Attribute Length Error. The Data | |
1124 | field contains the erroneous attribute (type, length and | |
1125 | value). */ | |
1126 | if (length != 1) { | |
e50f7cfd | 1127 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1128 | "Origin attribute length is not one %d", length); |
d62a17ae | 1129 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1130 | args->total); | |
1131 | } | |
1132 | ||
1133 | /* Fetch origin attribute. */ | |
1134 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1135 | ||
1136 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1137 | Subcode is set to Invalid Origin Attribute. The Data field | |
1138 | contains the unrecognized attribute (type, length and value). */ | |
1139 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1140 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1141 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1142 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1143 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1144 | args->total); | |
1145 | } | |
1146 | ||
1147 | /* Set oring attribute flag. */ | |
1148 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1149 | ||
1150 | return 0; | |
718e3744 | 1151 | } |
ab005298 PJ |
1152 | |
1153 | /* Parse AS path information. This function is wrapper of | |
1154 | aspath_parse. */ | |
d62a17ae | 1155 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1156 | { | |
1157 | struct attr *const attr = args->attr; | |
1158 | struct peer *const peer = args->peer; | |
1159 | const bgp_size_t length = args->length; | |
1160 | ||
1161 | /* | |
1162 | * peer with AS4 => will get 4Byte ASnums | |
1163 | * otherwise, will get 16 Bit | |
1164 | */ | |
424ab01d | 1165 | attr->aspath = aspath_parse(peer->curr, length, |
d62a17ae | 1166 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)); |
1167 | ||
1168 | /* In case of IBGP, length will be zero. */ | |
1169 | if (!attr->aspath) { | |
e50f7cfd | 1170 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1171 | "Malformed AS path from %s, length is %d", peer->host, |
1172 | length); | |
d62a17ae | 1173 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1174 | 0); | |
1175 | } | |
0b2aa3a0 | 1176 | |
d62a17ae | 1177 | /* Set aspath attribute flag. */ |
1178 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1179 | ||
1180 | return BGP_ATTR_PARSE_PROCEED; | |
1181 | } | |
1182 | ||
1183 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1184 | struct attr *const attr) | |
1185 | { | |
1186 | /* These checks were part of bgp_attr_aspath, but with | |
1187 | * as4 we should to check aspath things when | |
1188 | * aspath synthesizing with as4_path has already taken place. | |
1189 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1190 | * not right. | |
1191 | * So do the checks later, i.e. here | |
1192 | */ | |
d62a17ae | 1193 | struct aspath *aspath; |
1194 | ||
1195 | /* Confederation sanity check. */ | |
1196 | if ((peer->sort == BGP_PEER_CONFED | |
1197 | && !aspath_left_confed_check(attr->aspath)) | |
1198 | || (peer->sort == BGP_PEER_EBGP | |
1199 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1200 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1201 | peer->host); |
d62a17ae | 1202 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
1203 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1204 | return BGP_ATTR_PARSE_ERROR; | |
1205 | } | |
cddb8112 | 1206 | |
d62a17ae | 1207 | /* First AS check for EBGP. */ |
47cbc09b | 1208 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1209 | if (peer->sort == BGP_PEER_EBGP |
1210 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1211 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1212 | "%s incorrect first AS (must be %u)", |
1213 | peer->host, peer->as); | |
d62a17ae | 1214 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
1215 | BGP_NOTIFY_UPDATE_MAL_AS_PATH); | |
1216 | return BGP_ATTR_PARSE_ERROR; | |
1217 | } | |
1218 | } | |
0b2aa3a0 | 1219 | |
d62a17ae | 1220 | /* local-as prepend */ |
1221 | if (peer->change_local_as | |
1222 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1223 | aspath = aspath_dup(attr->aspath); | |
1224 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1225 | aspath_unintern(&attr->aspath); | |
1226 | attr->aspath = aspath_intern(aspath); | |
1227 | } | |
0b2aa3a0 | 1228 | |
d62a17ae | 1229 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1230 | } |
1231 | ||
ab005298 PJ |
1232 | /* Parse AS4 path information. This function is another wrapper of |
1233 | aspath_parse. */ | |
d62a17ae | 1234 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1235 | struct aspath **as4_path) | |
ab005298 | 1236 | { |
d62a17ae | 1237 | struct peer *const peer = args->peer; |
1238 | struct attr *const attr = args->attr; | |
1239 | const bgp_size_t length = args->length; | |
ab005298 | 1240 | |
424ab01d | 1241 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1242 | |
d62a17ae | 1243 | /* In case of IBGP, length will be zero. */ |
1244 | if (!*as4_path) { | |
e50f7cfd | 1245 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1246 | "Malformed AS4 path from %s, length is %d", peer->host, |
1247 | length); | |
d62a17ae | 1248 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1249 | 0); | |
1250 | } | |
ab005298 | 1251 | |
d62a17ae | 1252 | /* Set aspath attribute flag. */ |
1253 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1254 | ||
1255 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1256 | } |
1257 | ||
9738e9aa | 1258 | /* |
1259 | * Check that the nexthop attribute is valid. | |
1260 | */ | |
1261 | bgp_attr_parse_ret_t | |
1262 | bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr) | |
1263 | { | |
1264 | in_addr_t nexthop_h; | |
1265 | ||
1266 | nexthop_h = ntohl(attr->nexthop.s_addr); | |
1267 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1268 | || IPV4_CLASS_DE(nexthop_h)) | |
1269 | && !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) { | |
1270 | char buf[INET_ADDRSTRLEN]; | |
1271 | ||
1272 | inet_ntop(AF_INET, &attr->nexthop.s_addr, buf, | |
1273 | INET_ADDRSTRLEN); | |
1274 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", | |
1275 | buf); | |
1276 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
1277 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP); | |
1278 | return BGP_ATTR_PARSE_ERROR; | |
1279 | } | |
1280 | ||
1281 | return BGP_ATTR_PARSE_PROCEED; | |
1282 | } | |
1283 | ||
718e3744 | 1284 | /* Nexthop attribute. */ |
d62a17ae | 1285 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1286 | { | |
1287 | struct peer *const peer = args->peer; | |
1288 | struct attr *const attr = args->attr; | |
1289 | const bgp_size_t length = args->length; | |
1290 | ||
d62a17ae | 1291 | /* Check nexthop attribute length. */ |
1292 | if (length != 4) { | |
e50f7cfd | 1293 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1294 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1295 | |
1296 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1297 | args->total); | |
1298 | } | |
1299 | ||
88f33d66 | 1300 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1301 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1302 | ||
1303 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1304 | } |
1305 | ||
1306 | /* MED atrribute. */ | |
d62a17ae | 1307 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1308 | { |
d62a17ae | 1309 | struct peer *const peer = args->peer; |
1310 | struct attr *const attr = args->attr; | |
1311 | const bgp_size_t length = args->length; | |
b881c707 | 1312 | |
d62a17ae | 1313 | /* Length check. */ |
1314 | if (length != 4) { | |
e50f7cfd | 1315 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1316 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1317 | |
d62a17ae | 1318 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1319 | args->total); | |
1320 | } | |
1321 | ||
424ab01d | 1322 | attr->med = stream_getl(peer->curr); |
718e3744 | 1323 | |
d62a17ae | 1324 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1325 | |
d62a17ae | 1326 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1327 | } |
1328 | ||
1329 | /* Local preference attribute. */ | |
b881c707 | 1330 | static bgp_attr_parse_ret_t |
d62a17ae | 1331 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1332 | { | |
1333 | struct peer *const peer = args->peer; | |
1334 | struct attr *const attr = args->attr; | |
1335 | const bgp_size_t length = args->length; | |
1336 | ||
1337 | /* Length check. */ | |
1338 | if (length != 4) { | |
e50f7cfd | 1339 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1340 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1341 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1342 | args->total); | |
1343 | } | |
1344 | ||
1345 | /* If it is contained in an UPDATE message that is received from an | |
1346 | external peer, then this attribute MUST be ignored by the | |
1347 | receiving speaker. */ | |
1348 | if (peer->sort == BGP_PEER_EBGP) { | |
424ab01d | 1349 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1350 | return BGP_ATTR_PARSE_PROCEED; |
1351 | } | |
1352 | ||
424ab01d | 1353 | attr->local_pref = stream_getl(peer->curr); |
d62a17ae | 1354 | |
7f323236 | 1355 | /* Set the local-pref flag. */ |
d62a17ae | 1356 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1357 | ||
1358 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1359 | } |
1360 | ||
1361 | /* Atomic aggregate. */ | |
d62a17ae | 1362 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1363 | { |
d62a17ae | 1364 | struct attr *const attr = args->attr; |
1365 | const bgp_size_t length = args->length; | |
1366 | ||
1367 | /* Length check. */ | |
1368 | if (length != 0) { | |
e50f7cfd | 1369 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1370 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1371 | length); | |
d62a17ae | 1372 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1373 | args->total); | |
1374 | } | |
718e3744 | 1375 | |
d62a17ae | 1376 | /* Set atomic aggregate flag. */ |
1377 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1378 | |
d62a17ae | 1379 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1380 | } |
1381 | ||
1382 | /* Aggregator attribute */ | |
d62a17ae | 1383 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1384 | { | |
1385 | struct peer *const peer = args->peer; | |
1386 | struct attr *const attr = args->attr; | |
1387 | const bgp_size_t length = args->length; | |
1388 | ||
1389 | int wantedlen = 6; | |
1390 | ||
1391 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
1392 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
1393 | wantedlen = 8; | |
1394 | ||
1395 | if (length != wantedlen) { | |
e50f7cfd | 1396 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1397 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1398 | length); | |
d62a17ae | 1399 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1400 | args->total); | |
1401 | } | |
1402 | ||
1403 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
424ab01d | 1404 | attr->aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1405 | else |
424ab01d QY |
1406 | attr->aggregator_as = stream_getw(peer->curr); |
1407 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1408 | |
1409 | /* Set atomic aggregate flag. */ | |
1410 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1411 | ||
1412 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1413 | } |
1414 | ||
0b2aa3a0 | 1415 | /* New Aggregator attribute */ |
b881c707 | 1416 | static bgp_attr_parse_ret_t |
d62a17ae | 1417 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1418 | as_t *as4_aggregator_as, | |
1419 | struct in_addr *as4_aggregator_addr) | |
1420 | { | |
1421 | struct peer *const peer = args->peer; | |
1422 | struct attr *const attr = args->attr; | |
1423 | const bgp_size_t length = args->length; | |
1424 | ||
1425 | if (length != 8) { | |
1c50c1c0 QY |
1426 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1427 | length); | |
d62a17ae | 1428 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1429 | 0); | |
1430 | } | |
1431 | ||
424ab01d QY |
1432 | *as4_aggregator_as = stream_getl(peer->curr); |
1433 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
d62a17ae | 1434 | |
1435 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); | |
1436 | ||
1437 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1438 | } |
1439 | ||
1440 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1441 | */ | |
b881c707 | 1442 | static bgp_attr_parse_ret_t |
d62a17ae | 1443 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1444 | struct aspath *as4_path, as_t as4_aggregator, | |
1445 | struct in_addr *as4_aggregator_addr) | |
1446 | { | |
1447 | int ignore_as4_path = 0; | |
1448 | struct aspath *newpath; | |
1449 | ||
1450 | if (!attr->aspath) { | |
1451 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1452 | * have | |
1453 | * checked that all well-known, mandatory attributes were | |
1454 | * present. | |
1455 | * | |
1456 | * Can only be a problem with peer itself - hard error | |
1457 | */ | |
1458 | return BGP_ATTR_PARSE_ERROR; | |
1459 | } | |
1460 | ||
1461 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1462 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1463 | * if given. | |
1464 | * It is worth a warning though, because the peer really | |
1465 | * should not send them | |
1466 | */ | |
1467 | if (BGP_DEBUG(as4, AS4)) { | |
1468 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1469 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1470 | "AS4 capable peer, yet it sent"); | |
1471 | ||
1472 | if (attr->flag | |
1473 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1474 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1475 | peer->host, | |
1476 | "AS4 capable peer, yet it sent"); | |
1477 | } | |
1478 | ||
1479 | return BGP_ATTR_PARSE_PROCEED; | |
1480 | } | |
1481 | ||
1482 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1483 | * because that may override AS4_PATH | |
1484 | */ | |
1485 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1486 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1487 | /* received both. | |
1488 | * if the as_number in aggregator is not AS_TRANS, | |
1489 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1490 | * and the Aggregator shall be taken as | |
1491 | * info on the aggregating node, and the AS_PATH | |
1492 | * shall be taken as the AS_PATH | |
1493 | * otherwise | |
1494 | * the Aggregator shall be ignored and the | |
1495 | * AS4_AGGREGATOR shall be taken as the | |
1496 | * Aggregating node and the AS_PATH is to be | |
1497 | * constructed "as in all other cases" | |
1498 | */ | |
1499 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1500 | /* ignore */ | |
1501 | if (BGP_DEBUG(as4, AS4)) | |
1502 | zlog_debug( | |
1503 | "[AS4] %s BGP not AS4 capable peer" | |
1504 | " send AGGREGATOR != AS_TRANS and" | |
1505 | " AS4_AGGREGATOR, so ignore" | |
1506 | " AS4_AGGREGATOR and AS4_PATH", | |
1507 | peer->host); | |
1508 | ignore_as4_path = 1; | |
1509 | } else { | |
1510 | /* "New_aggregator shall be taken as aggregator" | |
1511 | */ | |
1512 | attr->aggregator_as = as4_aggregator; | |
1513 | attr->aggregator_addr.s_addr = | |
1514 | as4_aggregator_addr->s_addr; | |
1515 | } | |
1516 | } else { | |
1517 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1518 | * That is bogus - but reading the conditions | |
1519 | * we have to handle AS4_AGGREGATOR as if it were | |
1520 | * AGGREGATOR in that case | |
1521 | */ | |
1522 | if (BGP_DEBUG(as4, AS4)) | |
1523 | zlog_debug( | |
1524 | "[AS4] %s BGP not AS4 capable peer send" | |
1525 | " AS4_AGGREGATOR but no AGGREGATOR, will take" | |
1526 | " it as if AGGREGATOR with AS_TRANS had been there", | |
1527 | peer->host); | |
1528 | attr->aggregator_as = as4_aggregator; | |
1529 | /* sweep it under the carpet and simulate a "good" | |
1530 | * AGGREGATOR */ | |
1531 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1536 | if (!ignore_as4_path | |
1537 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1538 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1539 | if (!newpath) |
1540 | return BGP_ATTR_PARSE_ERROR; | |
1541 | ||
d62a17ae | 1542 | aspath_unintern(&attr->aspath); |
1543 | attr->aspath = aspath_intern(newpath); | |
1544 | } | |
1545 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1546 | } |
1547 | ||
718e3744 | 1548 | /* Community attribute. */ |
b881c707 | 1549 | static bgp_attr_parse_ret_t |
d62a17ae | 1550 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1551 | { | |
1552 | struct peer *const peer = args->peer; | |
1553 | struct attr *const attr = args->attr; | |
1554 | const bgp_size_t length = args->length; | |
1555 | ||
1556 | if (length == 0) { | |
1557 | attr->community = NULL; | |
1558 | return BGP_ATTR_PARSE_PROCEED; | |
1559 | } | |
1560 | ||
1561 | attr->community = | |
d7c0a89a | 1562 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1563 | |
1564 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1565 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1566 | |
1567 | if (!attr->community) | |
1568 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1569 | args->total); | |
1570 | ||
1571 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1572 | ||
1573 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1574 | } |
1575 | ||
1576 | /* Originator ID attribute. */ | |
b881c707 | 1577 | static bgp_attr_parse_ret_t |
d62a17ae | 1578 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1579 | { |
d62a17ae | 1580 | struct peer *const peer = args->peer; |
1581 | struct attr *const attr = args->attr; | |
1582 | const bgp_size_t length = args->length; | |
718e3744 | 1583 | |
d62a17ae | 1584 | /* Length check. */ |
1585 | if (length != 4) { | |
e50f7cfd | 1586 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 1587 | length); |
718e3744 | 1588 | |
d62a17ae | 1589 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1590 | args->total); | |
1591 | } | |
1592 | ||
424ab01d | 1593 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1594 | |
d62a17ae | 1595 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1596 | |
d62a17ae | 1597 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1598 | } |
1599 | ||
1600 | /* Cluster list attribute. */ | |
b881c707 | 1601 | static bgp_attr_parse_ret_t |
d62a17ae | 1602 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 1603 | { |
d62a17ae | 1604 | struct peer *const peer = args->peer; |
1605 | struct attr *const attr = args->attr; | |
1606 | const bgp_size_t length = args->length; | |
1607 | ||
1608 | /* Check length. */ | |
1609 | if (length % 4) { | |
1c50c1c0 | 1610 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 1611 | |
d62a17ae | 1612 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1613 | args->total); | |
1614 | } | |
1615 | ||
1616 | attr->cluster = | |
424ab01d | 1617 | cluster_parse((struct in_addr *)stream_pnt(peer->curr), length); |
718e3744 | 1618 | |
d62a17ae | 1619 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 1620 | stream_forward_getp(peer->curr, length); |
718e3744 | 1621 | |
d62a17ae | 1622 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 1623 | |
d62a17ae | 1624 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1625 | } |
1626 | ||
1627 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 1628 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
1629 | struct bgp_nlri *mp_update) | |
1630 | { | |
1631 | iana_afi_t pkt_afi; | |
1632 | afi_t afi; | |
5c525538 RW |
1633 | iana_safi_t pkt_safi; |
1634 | safi_t safi; | |
d62a17ae | 1635 | bgp_size_t nlri_len; |
1636 | size_t start; | |
1637 | struct stream *s; | |
1638 | struct peer *const peer = args->peer; | |
1639 | struct attr *const attr = args->attr; | |
1640 | const bgp_size_t length = args->length; | |
1641 | ||
1642 | /* Set end of packet. */ | |
1643 | s = BGP_INPUT(peer); | |
1644 | start = stream_get_getp(s); | |
1645 | ||
1646 | /* safe to read statically sized header? */ | |
6e4ab12f | 1647 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 1648 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 1649 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
1650 | zlog_info("%s: %s sent invalid length, %lu", __func__, | |
1651 | peer->host, (unsigned long)length); | |
1652 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1653 | } | |
1654 | ||
1655 | /* Load AFI, SAFI. */ | |
1656 | pkt_afi = stream_getw(s); | |
1657 | pkt_safi = stream_getc(s); | |
1658 | ||
1659 | /* Convert AFI, SAFI to internal values, check. */ | |
1660 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1661 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1662 | * unless | |
1663 | * the attribute is otherwise malformed. | |
1664 | */ | |
1665 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1666 | zlog_debug( | |
748a041f DS |
1667 | "%s: MP_REACH received AFI %s or SAFI %s is unrecognized", |
1668 | peer->host, iana_afi2str(pkt_afi), | |
1669 | iana_safi2str(pkt_safi)); | |
d62a17ae | 1670 | return BGP_ATTR_PARSE_ERROR; |
1671 | } | |
1672 | ||
1673 | /* Get nexthop length. */ | |
1674 | attr->mp_nexthop_len = stream_getc(s); | |
1675 | ||
1676 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
1677 | zlog_info( | |
1678 | "%s: %s, MP nexthop length, %u, goes past end of attribute", | |
1679 | __func__, peer->host, attr->mp_nexthop_len); | |
1680 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1681 | } | |
1682 | ||
1683 | /* Nexthop length check. */ | |
1684 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 1685 | case 0: |
1686 | if (safi != SAFI_FLOWSPEC) { | |
1687 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1688 | __func__, peer->host, attr->mp_nexthop_len); | |
1689 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1690 | } | |
1691 | break; | |
b6453163 LB |
1692 | case BGP_ATTR_NHLEN_VPNV4: |
1693 | stream_getl(s); /* RD high */ | |
1694 | stream_getl(s); /* RD low */ | |
996c9314 LB |
1695 | /* |
1696 | * NOTE: intentional fall through | |
1697 | * - for consistency in rx processing | |
1698 | * | |
1699 | * The following comment is to signal GCC this intention | |
0437e105 | 1700 | * and suppress the warning |
996c9314 LB |
1701 | */ |
1702 | /* FALLTHRU */ | |
d62a17ae | 1703 | case BGP_ATTR_NHLEN_IPV4: |
1704 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
1705 | /* Probably needed for RFC 2283 */ | |
1706 | if (attr->nexthop.s_addr == 0) | |
1707 | memcpy(&attr->nexthop.s_addr, | |
1708 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
1709 | break; | |
d62a17ae | 1710 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
1711 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
1712 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
1713 | stream_getl(s); /* RD high */ | |
1714 | stream_getl(s); /* RD low */ | |
1715 | } | |
1716 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
1717 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
1718 | if (!peer->nexthop.ifp) { | |
13366862 | 1719 | zlog_warn("%s: Received a V6/VPNV6 Global attribute but address is a V6 LL and we have no peer interface information, withdrawing", |
17cdd31e DS |
1720 | peer->host); |
1721 | return BGP_ATTR_PARSE_WITHDRAW; | |
1722 | } | |
77e62f2b | 1723 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 1724 | } |
d62a17ae | 1725 | break; |
1726 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
1727 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
1728 | if (attr->mp_nexthop_len | |
1729 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1730 | stream_getl(s); /* RD high */ | |
1731 | stream_getl(s); /* RD low */ | |
1732 | } | |
1733 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
1734 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
1735 | if (!peer->nexthop.ifp) { | |
13366862 | 1736 | zlog_warn("%s: Received V6/VPNV6 Global and LL attribute but global address is a V6 LL and we have no peer interface information, withdrawing", |
17cdd31e DS |
1737 | peer->host); |
1738 | return BGP_ATTR_PARSE_WITHDRAW; | |
1739 | } | |
77e62f2b | 1740 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 1741 | } |
d62a17ae | 1742 | if (attr->mp_nexthop_len |
1743 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
1744 | stream_getl(s); /* RD high */ | |
1745 | stream_getl(s); /* RD low */ | |
1746 | } | |
1747 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
1748 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
1749 | char buf1[INET6_ADDRSTRLEN]; | |
1750 | char buf2[INET6_ADDRSTRLEN]; | |
1751 | ||
1752 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
1753 | zlog_debug( | |
1754 | "%s rcvd nexthops %s, %s -- ignoring non-LL value", | |
1755 | peer->host, | |
1756 | inet_ntop(AF_INET6, | |
1757 | &attr->mp_nexthop_global, | |
1758 | buf1, INET6_ADDRSTRLEN), | |
1759 | inet_ntop(AF_INET6, | |
1760 | &attr->mp_nexthop_local, buf2, | |
1761 | INET6_ADDRSTRLEN)); | |
1762 | ||
1763 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
1764 | } | |
17cdd31e | 1765 | if (!peer->nexthop.ifp) { |
13366862 | 1766 | zlog_warn("%s: Received a V6 LL nexthop and we have no peer interface information, withdrawing", |
17cdd31e DS |
1767 | peer->host); |
1768 | return BGP_ATTR_PARSE_WITHDRAW; | |
1769 | } | |
77e62f2b | 1770 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 1771 | break; |
1772 | default: | |
1773 | zlog_info("%s: (%s) Wrong multiprotocol next hop length: %d", | |
1774 | __func__, peer->host, attr->mp_nexthop_len); | |
1775 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1776 | } | |
1777 | ||
1778 | if (!LEN_LEFT) { | |
1779 | zlog_info("%s: (%s) Failed to read SNPA and NLRI(s)", __func__, | |
1780 | peer->host); | |
1781 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1782 | } | |
1783 | ||
718e3744 | 1784 | { |
d7c0a89a | 1785 | uint8_t val; |
d62a17ae | 1786 | if ((val = stream_getc(s))) |
ade6974d | 1787 | flog_warn( |
e50f7cfd | 1788 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
1789 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
1790 | peer->host, val); | |
d62a17ae | 1791 | } |
1792 | ||
1793 | /* must have nrli_len, what is left of the attribute */ | |
1794 | nlri_len = LEN_LEFT; | |
9b9df989 | 1795 | if (nlri_len > STREAM_READABLE(s)) { |
d62a17ae | 1796 | zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host); |
1797 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1798 | } | |
1799 | ||
9b9df989 DS |
1800 | if (!nlri_len) { |
1801 | zlog_info("%s: (%s) No Reachability, Treating as a EOR marker", | |
1802 | __func__, peer->host); | |
1803 | ||
1804 | mp_update->afi = afi; | |
1805 | mp_update->safi = safi; | |
1806 | return BGP_ATTR_PARSE_EOR; | |
1807 | } | |
1808 | ||
d62a17ae | 1809 | mp_update->afi = afi; |
1810 | mp_update->safi = safi; | |
1811 | mp_update->nlri = stream_pnt(s); | |
1812 | mp_update->length = nlri_len; | |
1813 | ||
1814 | stream_forward_getp(s, nlri_len); | |
1815 | ||
1816 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
1817 | ||
1818 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 1819 | #undef LEN_LEFT |
718e3744 | 1820 | } |
1821 | ||
1822 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 1823 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
1824 | struct bgp_nlri *mp_withdraw) | |
1825 | { | |
1826 | struct stream *s; | |
1827 | iana_afi_t pkt_afi; | |
1828 | afi_t afi; | |
5c525538 RW |
1829 | iana_safi_t pkt_safi; |
1830 | safi_t safi; | |
d7c0a89a | 1831 | uint16_t withdraw_len; |
d62a17ae | 1832 | struct peer *const peer = args->peer; |
1833 | struct attr *const attr = args->attr; | |
1834 | const bgp_size_t length = args->length; | |
9cabb64b | 1835 | |
424ab01d | 1836 | s = peer->curr; |
9cabb64b | 1837 | |
d62a17ae | 1838 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
1839 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
1840 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
1841 | ||
1842 | pkt_afi = stream_getw(s); | |
1843 | pkt_safi = stream_getc(s); | |
1844 | ||
1845 | /* Convert AFI, SAFI to internal values, check. */ | |
1846 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
1847 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
1848 | * unless | |
1849 | * the attribute is otherwise malformed. | |
1850 | */ | |
1851 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
1852 | zlog_debug( | |
748a041f DS |
1853 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
1854 | peer->host, iana_afi2str(pkt_afi), | |
1855 | iana_safi2str(pkt_safi)); | |
d62a17ae | 1856 | return BGP_ATTR_PARSE_ERROR; |
1857 | } | |
718e3744 | 1858 | |
d62a17ae | 1859 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 1860 | |
d62a17ae | 1861 | mp_withdraw->afi = afi; |
1862 | mp_withdraw->safi = safi; | |
1863 | mp_withdraw->nlri = stream_pnt(s); | |
1864 | mp_withdraw->length = withdraw_len; | |
718e3744 | 1865 | |
d62a17ae | 1866 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 1867 | |
d62a17ae | 1868 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
1869 | ||
1870 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1871 | } |
1872 | ||
57d187bc JS |
1873 | /* Large Community attribute. */ |
1874 | static bgp_attr_parse_ret_t | |
d62a17ae | 1875 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
1876 | { | |
1877 | struct peer *const peer = args->peer; | |
1878 | struct attr *const attr = args->attr; | |
1879 | const bgp_size_t length = args->length; | |
1880 | ||
1881 | /* | |
1882 | * Large community follows new attribute format. | |
1883 | */ | |
1884 | if (length == 0) { | |
1885 | attr->lcommunity = NULL; | |
1886 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1887 | return BGP_ATTR_PARSE_PROCEED; | |
1888 | } | |
57d187bc | 1889 | |
d62a17ae | 1890 | attr->lcommunity = |
d7c0a89a | 1891 | lcommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1892 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1893 | stream_forward_getp(peer->curr, length); |
57d187bc | 1894 | |
d62a17ae | 1895 | if (!attr->lcommunity) |
1896 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1897 | args->total); | |
57d187bc | 1898 | |
d62a17ae | 1899 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 1900 | |
d62a17ae | 1901 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
1902 | } |
1903 | ||
718e3744 | 1904 | /* Extended Community attribute. */ |
b881c707 | 1905 | static bgp_attr_parse_ret_t |
d62a17ae | 1906 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
1907 | { | |
1908 | struct peer *const peer = args->peer; | |
1909 | struct attr *const attr = args->attr; | |
1910 | const bgp_size_t length = args->length; | |
d7c0a89a | 1911 | uint8_t sticky = 0; |
d62a17ae | 1912 | |
1913 | if (length == 0) { | |
1914 | attr->ecommunity = NULL; | |
1915 | /* Empty extcomm doesn't seem to be invalid per se */ | |
1916 | return BGP_ATTR_PARSE_PROCEED; | |
1917 | } | |
1918 | ||
1919 | attr->ecommunity = | |
d7c0a89a | 1920 | ecommunity_parse((uint8_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1921 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 1922 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1923 | |
1924 | if (!attr->ecommunity) | |
1925 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1926 | args->total); | |
1927 | ||
1928 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1929 | ||
1930 | /* Extract MAC mobility sequence number, if any. */ | |
1931 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
1932 | attr->sticky = sticky; | |
1933 | ||
ead40654 MK |
1934 | /* Check if this is a Gateway MAC-IP advertisement */ |
1935 | attr->default_gw = bgp_attr_default_gw(attr); | |
1936 | ||
68e33151 CS |
1937 | /* Handle scenario where router flag ecommunity is not |
1938 | * set but default gw ext community is present. | |
1939 | * Use default gateway, set and propogate R-bit. | |
1940 | */ | |
1941 | if (attr->default_gw) | |
1942 | attr->router_flag = 1; | |
1943 | ||
1944 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
1945 | bgp_attr_evpn_na_flag(attr, &attr->router_flag); | |
1946 | ||
bc59a672 | 1947 | /* Extract the Rmac, if any */ |
eee353c5 CS |
1948 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
1949 | if (bgp_debug_update(peer, NULL, NULL, 1) && | |
1950 | bgp_mac_exist(&attr->rmac)) { | |
1951 | char buf1[ETHER_ADDR_STRLEN]; | |
1952 | ||
1953 | zlog_debug("%s: router mac %s is self mac", | |
1954 | __func__, | |
1955 | prefix_mac2str(&attr->rmac, buf1, | |
1956 | sizeof(buf1))); | |
1957 | } | |
1958 | ||
1959 | } | |
bc59a672 | 1960 | |
f4bd90c5 LK |
1961 | /* Get the tunnel type from encap extended community */ |
1962 | bgp_attr_extcom_tunnel_type(attr, | |
1963 | (bgp_encap_types *)&attr->encap_tunneltype); | |
1964 | ||
d62a17ae | 1965 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1966 | } |
1967 | ||
f4c89855 | 1968 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 1969 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
1970 | bgp_size_t length, /* IN: attr's length field */ | |
1971 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
1972 | uint8_t flag, /* IN: attr's flags field */ |
1973 | uint8_t *startp) | |
d62a17ae | 1974 | { |
1975 | bgp_size_t total; | |
d62a17ae | 1976 | uint16_t tunneltype = 0; |
1977 | ||
1978 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
1979 | ||
1980 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
1981 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
1982 | zlog_info( | |
1983 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
1984 | flag); | |
1985 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1986 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
1987 | startp, total); | |
1988 | return -1; | |
1989 | } | |
1990 | ||
1991 | if (BGP_ATTR_ENCAP == type) { | |
1992 | /* read outer TLV type and length */ | |
1993 | uint16_t tlv_length; | |
1994 | ||
1995 | if (length < 4) { | |
1996 | zlog_info( | |
1997 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
1998 | bgp_notify_send_with_data( | |
1999 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2000 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2001 | return -1; | |
2002 | } | |
2003 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2004 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2005 | length -= 4; | |
2006 | ||
2007 | if (tlv_length != length) { | |
2008 | zlog_info("%s: tlv_length(%d) != length(%d)", __func__, | |
2009 | tlv_length, length); | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | while (length >= 4) { | |
2014 | uint16_t subtype = 0; | |
2015 | uint16_t sublength = 0; | |
2016 | struct bgp_attr_encap_subtlv *tlv; | |
2017 | ||
2018 | if (BGP_ATTR_ENCAP == type) { | |
2019 | subtype = stream_getc(BGP_INPUT(peer)); | |
2020 | sublength = stream_getc(BGP_INPUT(peer)); | |
2021 | length -= 2; | |
65efcfce | 2022 | #if ENABLE_BGP_VNC |
d62a17ae | 2023 | } else { |
2024 | subtype = stream_getw(BGP_INPUT(peer)); | |
2025 | sublength = stream_getw(BGP_INPUT(peer)); | |
2026 | length -= 4; | |
65efcfce | 2027 | #endif |
d62a17ae | 2028 | } |
2029 | ||
2030 | if (sublength > length) { | |
2031 | zlog_info( | |
2032 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2033 | sublength, length); | |
2034 | bgp_notify_send_with_data( | |
2035 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2036 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2037 | return -1; | |
2038 | } | |
2039 | ||
2040 | /* alloc and copy sub-tlv */ | |
2041 | /* TBD make sure these are freed when attributes are released */ | |
2042 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2043 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2044 | tlv->type = subtype; |
2045 | tlv->length = sublength; | |
424ab01d | 2046 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2047 | length -= sublength; |
2048 | ||
2049 | /* attach tlv to encap chain */ | |
2050 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2051 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2052 | for (stlv_last = attr->encap_subtlvs; |
2053 | stlv_last && stlv_last->next; | |
2054 | stlv_last = stlv_last->next) | |
2055 | ; | |
2056 | if (stlv_last) { | |
2057 | stlv_last->next = tlv; | |
2058 | } else { | |
2059 | attr->encap_subtlvs = tlv; | |
2060 | } | |
65efcfce | 2061 | #if ENABLE_BGP_VNC |
d62a17ae | 2062 | } else { |
e4002056 | 2063 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2064 | for (stlv_last = attr->vnc_subtlvs; |
2065 | stlv_last && stlv_last->next; | |
2066 | stlv_last = stlv_last->next) | |
2067 | ; | |
2068 | if (stlv_last) { | |
2069 | stlv_last->next = tlv; | |
2070 | } else { | |
2071 | attr->vnc_subtlvs = tlv; | |
2072 | } | |
aadc0905 | 2073 | #endif |
d62a17ae | 2074 | } |
d62a17ae | 2075 | } |
f4c89855 | 2076 | |
d62a17ae | 2077 | if (BGP_ATTR_ENCAP == type) { |
2078 | attr->encap_tunneltype = tunneltype; | |
2079 | } | |
f4c89855 | 2080 | |
d62a17ae | 2081 | if (length) { |
2082 | /* spurious leftover data */ | |
2083 | zlog_info( | |
2084 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2085 | length); | |
2086 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2087 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2088 | startp, total); | |
2089 | return -1; | |
2090 | } | |
f4c89855 | 2091 | |
d62a17ae | 2092 | return 0; |
f4c89855 LB |
2093 | } |
2094 | ||
30adbd4e DS |
2095 | /* |
2096 | * Read an individual SID value returning how much data we have read | |
2097 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2098 | */ |
30adbd4e DS |
2099 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(int32_t type, |
2100 | int32_t length, | |
2101 | struct bgp_attr_parser_args *args, | |
2102 | struct bgp_nlri *mp_update) | |
d62a17ae | 2103 | { |
2104 | struct peer *const peer = args->peer; | |
2105 | struct attr *const attr = args->attr; | |
d7c0a89a | 2106 | uint32_t label_index; |
d62a17ae | 2107 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2108 | uint32_t srgb_base; |
2109 | uint32_t srgb_range; | |
d62a17ae | 2110 | int srgb_count; |
2111 | ||
d62a17ae | 2112 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
2113 | if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
af4c2728 | 2114 | flog_err( |
e50f7cfd | 2115 | EC_BGP_ATTR_LEN, |
14454c9f DS |
2116 | "Prefix SID label index length is %d instead of %d", |
2117 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
30adbd4e DS |
2118 | return bgp_attr_malformed(args, |
2119 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2120 | args->total); | |
d62a17ae | 2121 | } |
2122 | ||
2123 | /* Ignore flags and reserved */ | |
424ab01d QY |
2124 | stream_getc(peer->curr); |
2125 | stream_getw(peer->curr); | |
d62a17ae | 2126 | |
2127 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2128 | label_index = stream_getl(peer->curr); |
d62a17ae | 2129 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2130 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2131 | args->total); | |
d62a17ae | 2132 | |
2133 | /* Store label index; subsequently, we'll check on | |
2134 | * address-family */ | |
2135 | attr->label_index = label_index; | |
2136 | ||
2137 | /* | |
2138 | * Ignore the Label index attribute unless received for | |
2139 | * labeled-unicast | |
2140 | * SAFI. | |
2141 | */ | |
2142 | if (!mp_update->length | |
2143 | || mp_update->safi != SAFI_LABELED_UNICAST) | |
2144 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
2145 | } | |
2146 | ||
2147 | /* Placeholder code for the IPv6 SID type */ | |
2148 | else if (type == BGP_PREFIX_SID_IPV6) { | |
2149 | if (length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2150 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
2151 | "Prefix SID IPv6 length is %d instead of %d", |
2152 | length, BGP_PREFIX_SID_IPV6_LENGTH); | |
30adbd4e DS |
2153 | return bgp_attr_malformed(args, |
2154 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2155 | args->total); | |
d62a17ae | 2156 | } |
2157 | ||
2158 | /* Ignore reserved */ | |
424ab01d QY |
2159 | stream_getc(peer->curr); |
2160 | stream_getw(peer->curr); | |
d62a17ae | 2161 | |
424ab01d | 2162 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2163 | } |
2164 | ||
2165 | /* Placeholder code for the Originator SRGB type */ | |
2166 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
2167 | /* Ignore flags */ | |
424ab01d | 2168 | stream_getw(peer->curr); |
d62a17ae | 2169 | |
2170 | length -= 2; | |
2171 | ||
2172 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { | |
af4c2728 | 2173 | flog_err( |
e50f7cfd | 2174 | EC_BGP_ATTR_LEN, |
d62a17ae | 2175 | "Prefix SID Originator SRGB length is %d, it must be a multiple of %d ", |
2176 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2177 | return bgp_attr_malformed( | |
2178 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2179 | args->total); | |
2180 | } | |
2181 | ||
2182 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2183 | ||
2184 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2185 | stream_get(&srgb_base, peer->curr, 3); |
2186 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2187 | } |
2188 | } | |
2189 | ||
2190 | return BGP_ATTR_PARSE_PROCEED; | |
6cf48acc VV |
2191 | } |
2192 | ||
30adbd4e DS |
2193 | /* Prefix SID attribute |
2194 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2195 | */ | |
2196 | bgp_attr_parse_ret_t | |
2197 | bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args, | |
2198 | struct bgp_nlri *mp_update) | |
2199 | { | |
2200 | struct peer *const peer = args->peer; | |
2201 | struct attr *const attr = args->attr; | |
2202 | bgp_attr_parse_ret_t ret; | |
2203 | ||
2204 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2205 | ||
2206 | while (tlength) { | |
2207 | int32_t type, length; | |
2208 | ||
2209 | type = stream_getc(peer->curr); | |
2210 | length = stream_getw(peer->curr); | |
2211 | ||
2212 | ret = bgp_attr_psid_sub(type, length, args, mp_update); | |
2213 | ||
2214 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2215 | return ret; | |
2216 | /* | |
2217 | * Subtract length + the T and the L | |
2218 | * since length is the Vector portion | |
2219 | */ | |
2220 | tlength -= length + 3; | |
2221 | ||
2222 | if (tlength < 0) { | |
af4c2728 | 2223 | flog_err( |
e50f7cfd | 2224 | EC_BGP_ATTR_LEN, |
14454c9f DS |
2225 | "Prefix SID internal length %d causes us to read beyond the total Prefix SID length", |
2226 | length); | |
30adbd4e DS |
2227 | return bgp_attr_malformed(args, |
2228 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2229 | args->total); | |
2230 | } | |
2231 | } | |
2232 | ||
2233 | return BGP_ATTR_PARSE_PROCEED; | |
2234 | } | |
2235 | ||
7fd077aa | 2236 | /* PMSI tunnel attribute (RFC 6514) |
2237 | * Basic validation checks done here. | |
2238 | */ | |
2239 | static bgp_attr_parse_ret_t | |
2240 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2241 | { | |
2242 | struct peer *const peer = args->peer; | |
2243 | struct attr *const attr = args->attr; | |
2244 | const bgp_size_t length = args->length; | |
d7c0a89a | 2245 | uint8_t tnl_type; |
355f3c11 | 2246 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 2247 | |
2248 | /* Verify that the receiver is expecting "ingress replication" as we | |
2249 | * can only support that. | |
2250 | */ | |
355f3c11 | 2251 | if (length < attr_parse_len) { |
1c50c1c0 QY |
2252 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
2253 | length); | |
7fd077aa | 2254 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2255 | args->total); | |
2256 | } | |
2257 | stream_getc(peer->curr); /* Flags */ | |
2258 | tnl_type = stream_getc(peer->curr); | |
2259 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 2260 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 2261 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 2262 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2263 | args->total); | |
2264 | } | |
2265 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2266 | if (length != 9) { | |
e50f7cfd | 2267 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
2268 | "Bad PMSI tunnel attribute length %d for IR", |
2269 | length); | |
052ea98b | 2270 | return bgp_attr_malformed( |
2271 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2272 | args->total); | |
7fd077aa | 2273 | } |
2274 | } | |
2275 | ||
2276 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2277 | attr->pmsi_tnl_type = tnl_type; | |
355f3c11 | 2278 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 2279 | |
2280 | /* Forward read pointer of input stream. */ | |
355f3c11 | 2281 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 2282 | |
2283 | return BGP_ATTR_PARSE_PROCEED; | |
2284 | } | |
2285 | ||
718e3744 | 2286 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2287 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2288 | { | |
2289 | bgp_size_t total = args->total; | |
2290 | struct transit *transit; | |
2291 | struct peer *const peer = args->peer; | |
2292 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
2293 | uint8_t *const startp = args->startp; |
2294 | const uint8_t type = args->type; | |
2295 | const uint8_t flag = args->flags; | |
d62a17ae | 2296 | const bgp_size_t length = args->length; |
2297 | ||
2298 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2299 | zlog_debug( | |
2300 | "%s Unknown attribute is received (type %d, length %d)", | |
2301 | peer->host, type, length); | |
2302 | ||
2303 | /* Forward read pointer of input stream. */ | |
424ab01d | 2304 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2305 | |
2306 | /* If any of the mandatory well-known attributes are not recognized, | |
2307 | then the Error Subcode is set to Unrecognized Well-known | |
2308 | Attribute. The Data field contains the unrecognized attribute | |
2309 | (type, length and value). */ | |
2310 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2311 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2312 | args->total); | |
2313 | } | |
2314 | ||
2315 | /* Unrecognized non-transitive optional attributes must be quietly | |
2316 | ignored and not passed along to other BGP peers. */ | |
2317 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2318 | return BGP_ATTR_PARSE_PROCEED; | |
2319 | ||
2320 | /* If a path with recognized transitive optional attribute is | |
2321 | accepted and passed along to other BGP peers and the Partial bit | |
2322 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2323 | is not set back to 0 by the current AS. */ | |
2324 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2325 | ||
2326 | /* Store transitive attribute to the end of attr->transit. */ | |
2327 | if (!attr->transit) | |
2328 | attr->transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
2329 | ||
2330 | transit = attr->transit; | |
2331 | ||
2332 | if (transit->val) | |
2333 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, | |
2334 | transit->length + total); | |
2335 | else | |
2336 | transit->val = XMALLOC(MTYPE_TRANSIT_VAL, total); | |
2337 | ||
2338 | memcpy(transit->val + transit->length, startp, total); | |
2339 | transit->length += total; | |
2340 | ||
2341 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2342 | } |
2343 | ||
bb7bef14 | 2344 | /* Well-known attribute check. */ |
d62a17ae | 2345 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2346 | { | |
d7c0a89a | 2347 | uint8_t type = 0; |
d62a17ae | 2348 | |
2349 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2350 | * empty UPDATE. */ | |
2351 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2352 | return BGP_ATTR_PARSE_PROCEED; | |
2353 | ||
2354 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2355 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2356 | are present, it should. Check for any other attribute being present | |
2357 | instead. | |
2358 | */ | |
404c82d5 PG |
2359 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
2360 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 2361 | return BGP_ATTR_PARSE_PROCEED; |
2362 | ||
2363 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2364 | type = BGP_ATTR_ORIGIN; | |
2365 | ||
2366 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2367 | type = BGP_ATTR_AS_PATH; | |
2368 | ||
2369 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2370 | * and | |
2371 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2372 | */ | |
2373 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2374 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2375 | type = BGP_ATTR_NEXT_HOP; | |
2376 | ||
2377 | if (peer->sort == BGP_PEER_IBGP | |
2378 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2379 | type = BGP_ATTR_LOCAL_PREF; | |
2380 | ||
2381 | if (type) { | |
e50f7cfd | 2382 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 2383 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 2384 | lookup_msg(attr_str, type, NULL)); |
2385 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2386 | BGP_NOTIFY_UPDATE_MISS_ATTR, &type, | |
2387 | 1); | |
2388 | return BGP_ATTR_PARSE_ERROR; | |
2389 | } | |
2390 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2391 | } |
2392 | ||
718e3744 | 2393 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2394 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2395 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2396 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2397 | struct bgp_nlri *mp_withdraw) | |
2398 | { | |
f7813c7c | 2399 | bgp_attr_parse_ret_t ret; |
d7c0a89a QY |
2400 | uint8_t flag = 0; |
2401 | uint8_t type = 0; | |
d62a17ae | 2402 | bgp_size_t length; |
d7c0a89a QY |
2403 | uint8_t *startp, *endp; |
2404 | uint8_t *attr_endp; | |
2405 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 2406 | /* we need the as4_path only until we have synthesized the as_path with |
2407 | * it */ | |
2408 | /* same goes for as4_aggregator */ | |
2409 | struct aspath *as4_path = NULL; | |
2410 | as_t as4_aggregator = 0; | |
2411 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
2412 | ||
2413 | /* Initialize bitmap. */ | |
2414 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
2415 | ||
2416 | /* End pointer of BGP attribute. */ | |
2417 | endp = BGP_INPUT_PNT(peer) + size; | |
2418 | ||
2419 | /* Get attributes to the end of attribute length. */ | |
2420 | while (BGP_INPUT_PNT(peer) < endp) { | |
2421 | /* Check remaining length check.*/ | |
2422 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
2423 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 2424 | flog_warn( |
e50f7cfd | 2425 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
2426 | "%s: error BGP attribute length %lu is smaller than min len", |
2427 | peer->host, | |
2428 | (unsigned long)(endp | |
2429 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 2430 | |
2431 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2432 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2433 | return BGP_ATTR_PARSE_ERROR; | |
2434 | } | |
718e3744 | 2435 | |
d62a17ae | 2436 | /* Fetch attribute flag and type. */ |
2437 | startp = BGP_INPUT_PNT(peer); | |
2438 | /* "The lower-order four bits of the Attribute Flags octet are | |
2439 | unused. They MUST be zero when sent and MUST be ignored when | |
2440 | received." */ | |
2441 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
2442 | type = stream_getc(BGP_INPUT(peer)); | |
2443 | ||
2444 | /* Check whether Extended-Length applies and is in bounds */ | |
2445 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
2446 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 2447 | flog_warn( |
e50f7cfd | 2448 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
2449 | "%s: Extended length set, but just %lu bytes of attr header", |
2450 | peer->host, | |
2451 | (unsigned long)(endp | |
2452 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 2453 | |
2454 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2455 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2456 | return BGP_ATTR_PARSE_ERROR; | |
2457 | } | |
718e3744 | 2458 | |
d62a17ae | 2459 | /* Check extended attribue length bit. */ |
2460 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
2461 | length = stream_getw(BGP_INPUT(peer)); | |
2462 | else | |
2463 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 2464 | |
d62a17ae | 2465 | /* If any attribute appears more than once in the UPDATE |
2466 | message, then the Error Subcode is set to Malformed Attribute | |
2467 | List. */ | |
718e3744 | 2468 | |
d62a17ae | 2469 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 2470 | flog_warn( |
e50f7cfd | 2471 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
2472 | "%s: error BGP attribute type %d appears twice in a message", |
2473 | peer->host, type); | |
718e3744 | 2474 | |
d62a17ae | 2475 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
2476 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2477 | return BGP_ATTR_PARSE_ERROR; | |
2478 | } | |
2479 | ||
2480 | /* Set type to bitmap to check duplicate attribute. `type' is | |
2481 | unsigned char so it never overflow bitmap range. */ | |
2482 | ||
2483 | SET_BITMAP(seen, type); | |
2484 | ||
2485 | /* Overflow check. */ | |
2486 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
2487 | ||
2488 | if (attr_endp > endp) { | |
ade6974d | 2489 | flog_warn( |
e50f7cfd | 2490 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
2491 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
2492 | peer->host, type, length, size, attr_endp, | |
2493 | endp); | |
dacffad4 QY |
2494 | /* |
2495 | * RFC 4271 6.3 | |
2496 | * If any recognized attribute has an Attribute | |
2497 | * Length that conflicts with the expected length | |
2498 | * (based on the attribute type code), then the | |
2499 | * Error Subcode MUST be set to Attribute Length | |
2500 | * Error. The Data field MUST contain the erroneous | |
2501 | * attribute (type, length, and value). | |
2502 | * ---------- | |
2503 | * We do not currently have a good way to determine the | |
2504 | * length of the attribute independent of the length | |
2505 | * received in the message. Instead we send the | |
2506 | * minimum between the amount of data we have and the | |
2507 | * amount specified by the attribute length field. | |
2508 | * | |
2509 | * Instead of directly passing in the packet buffer and | |
2510 | * offset we use the stream_get* functions to read into | |
2511 | * a stack buffer, since they perform bounds checking | |
2512 | * and we are working with untrusted data. | |
2513 | */ | |
2514 | unsigned char ndata[BGP_MAX_PACKET_SIZE]; | |
2515 | memset(ndata, 0x00, sizeof(ndata)); | |
2516 | size_t lfl = | |
2517 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
2518 | /* Rewind to end of flag field */ | |
2519 | stream_forward_getp(BGP_INPUT(peer), -(1 + lfl)); | |
2520 | /* Type */ | |
2521 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
2522 | /* Length */ | |
2523 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
2524 | /* Value */ | |
2525 | size_t atl = attr_endp - startp; | |
2526 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
2527 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
2528 | ||
d62a17ae | 2529 | bgp_notify_send_with_data( |
2530 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
2531 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
2532 | ndl + lfl + 1); | |
2533 | ||
d62a17ae | 2534 | return BGP_ATTR_PARSE_ERROR; |
2535 | } | |
2536 | ||
2537 | struct bgp_attr_parser_args attr_args = { | |
2538 | .peer = peer, | |
2539 | .length = length, | |
2540 | .attr = attr, | |
2541 | .type = type, | |
2542 | .flags = flag, | |
2543 | .startp = startp, | |
2544 | .total = attr_endp - startp, | |
2545 | }; | |
2546 | ||
2547 | ||
2548 | /* If any recognized attribute has Attribute Flags that conflict | |
2549 | with the Attribute Type Code, then the Error Subcode is set | |
2550 | to | |
2551 | Attribute Flags Error. The Data field contains the erroneous | |
2552 | attribute (type, length and value). */ | |
2553 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 2554 | ret = bgp_attr_malformed( |
2555 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2556 | attr_args.total); | |
2557 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
2558 | continue; | |
2559 | return ret; | |
2560 | } | |
2561 | ||
2562 | /* OK check attribute and store it's value. */ | |
2563 | switch (type) { | |
2564 | case BGP_ATTR_ORIGIN: | |
2565 | ret = bgp_attr_origin(&attr_args); | |
2566 | break; | |
2567 | case BGP_ATTR_AS_PATH: | |
2568 | ret = bgp_attr_aspath(&attr_args); | |
2569 | break; | |
2570 | case BGP_ATTR_AS4_PATH: | |
2571 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
2572 | break; | |
2573 | case BGP_ATTR_NEXT_HOP: | |
2574 | ret = bgp_attr_nexthop(&attr_args); | |
2575 | break; | |
2576 | case BGP_ATTR_MULTI_EXIT_DISC: | |
2577 | ret = bgp_attr_med(&attr_args); | |
2578 | break; | |
2579 | case BGP_ATTR_LOCAL_PREF: | |
2580 | ret = bgp_attr_local_pref(&attr_args); | |
2581 | break; | |
2582 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
2583 | ret = bgp_attr_atomic(&attr_args); | |
2584 | break; | |
2585 | case BGP_ATTR_AGGREGATOR: | |
2586 | ret = bgp_attr_aggregator(&attr_args); | |
2587 | break; | |
2588 | case BGP_ATTR_AS4_AGGREGATOR: | |
2589 | ret = bgp_attr_as4_aggregator(&attr_args, | |
2590 | &as4_aggregator, | |
2591 | &as4_aggregator_addr); | |
2592 | break; | |
2593 | case BGP_ATTR_COMMUNITIES: | |
2594 | ret = bgp_attr_community(&attr_args); | |
2595 | break; | |
2596 | case BGP_ATTR_LARGE_COMMUNITIES: | |
2597 | ret = bgp_attr_large_community(&attr_args); | |
2598 | break; | |
2599 | case BGP_ATTR_ORIGINATOR_ID: | |
2600 | ret = bgp_attr_originator_id(&attr_args); | |
2601 | break; | |
2602 | case BGP_ATTR_CLUSTER_LIST: | |
2603 | ret = bgp_attr_cluster_list(&attr_args); | |
2604 | break; | |
2605 | case BGP_ATTR_MP_REACH_NLRI: | |
2606 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
2607 | break; | |
2608 | case BGP_ATTR_MP_UNREACH_NLRI: | |
2609 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
2610 | break; | |
2611 | case BGP_ATTR_EXT_COMMUNITIES: | |
2612 | ret = bgp_attr_ext_communities(&attr_args); | |
2613 | break; | |
943d595a | 2614 | #if ENABLE_BGP_VNC_ATTR |
d62a17ae | 2615 | case BGP_ATTR_VNC: |
65efcfce | 2616 | #endif |
d62a17ae | 2617 | case BGP_ATTR_ENCAP: |
2618 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
2619 | startp); | |
2620 | break; | |
2621 | case BGP_ATTR_PREFIX_SID: | |
30adbd4e DS |
2622 | ret = bgp_attr_prefix_sid(length, |
2623 | &attr_args, mp_update); | |
d62a17ae | 2624 | break; |
7fd077aa | 2625 | case BGP_ATTR_PMSI_TUNNEL: |
2626 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
2627 | break; | |
d62a17ae | 2628 | default: |
2629 | ret = bgp_attr_unknown(&attr_args); | |
2630 | break; | |
2631 | } | |
2632 | ||
2633 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
2634 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2635 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2636 | ret = BGP_ATTR_PARSE_ERROR; | |
2637 | } | |
2638 | ||
9b9df989 DS |
2639 | if (ret == BGP_ATTR_PARSE_EOR) { |
2640 | if (as4_path) | |
2641 | aspath_unintern(&as4_path); | |
2642 | return ret; | |
2643 | } | |
2644 | ||
0437e105 | 2645 | /* If hard error occurred immediately return to the caller. */ |
d62a17ae | 2646 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 2647 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 2648 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 2649 | lookup_msg(attr_str, type, NULL)); |
2650 | if (as4_path) | |
2651 | aspath_unintern(&as4_path); | |
2652 | return ret; | |
2653 | } | |
2654 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
2655 | ||
ade6974d | 2656 | flog_warn( |
e50f7cfd | 2657 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 2658 | "%s: Attribute %s, parse error - treating as withdrawal", |
2659 | peer->host, lookup_msg(attr_str, type, NULL)); | |
2660 | if (as4_path) | |
2661 | aspath_unintern(&as4_path); | |
2662 | return ret; | |
2663 | } | |
2664 | ||
2665 | /* Check the fetched length. */ | |
2666 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 2667 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 2668 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 2669 | peer->host, lookup_msg(attr_str, type, NULL)); |
2670 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2671 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2672 | if (as4_path) | |
2673 | aspath_unintern(&as4_path); | |
2674 | return BGP_ATTR_PARSE_ERROR; | |
2675 | } | |
718e3744 | 2676 | } |
d62a17ae | 2677 | |
2678 | /* Check final read pointer is same as end pointer. */ | |
2679 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 2680 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 2681 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 2682 | lookup_msg(attr_str, type, NULL)); |
2683 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2684 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
2685 | if (as4_path) | |
2686 | aspath_unintern(&as4_path); | |
2687 | return BGP_ATTR_PARSE_ERROR; | |
2688 | } | |
2689 | ||
88f33d66 | 2690 | /* |
2691 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
2692 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
2693 | * This is implemented below and will result in a NOTIFICATION. If the | |
2694 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
2695 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
2696 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
2697 | * | |
2698 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
2699 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
2700 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
2701 | * speaker that receives the message SHOULD ignore this attribute. | |
2702 | */ | |
2703 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2704 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 2705 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
88f33d66 | 2706 | return BGP_ATTR_PARSE_ERROR; |
2707 | } | |
2708 | } | |
2709 | ||
d62a17ae | 2710 | /* Check all mandatory well-known attributes are present */ |
f7813c7c A |
2711 | if ((ret = bgp_attr_check(peer, attr)) < 0) { |
2712 | if (as4_path) | |
2713 | aspath_unintern(&as4_path); | |
2714 | return ret; | |
d62a17ae | 2715 | } |
2716 | ||
2717 | /* | |
2718 | * At this place we can see whether we got AS4_PATH and/or | |
2719 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
2720 | * We can not do this before we've read all attributes because | |
2721 | * the as4 handling does not say whether AS4_PATH has to be sent | |
2722 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
2723 | * in relationship to AGGREGATOR. | |
2724 | * So, to be defensive, we are not relying on any order and read | |
2725 | * all attributes first, including these 32bit ones, and now, | |
2726 | * afterwards, we look what and if something is to be done for as4. | |
2727 | * | |
2728 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
2729 | * MP_UNREACH_NLRI. | |
2730 | */ | |
2731 | /* actually... this doesn't ever return failure currently, but | |
2732 | * better safe than sorry */ | |
2733 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
2734 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
2735 | &as4_aggregator_addr)) { | |
2736 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
2737 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
2738 | if (as4_path) | |
2739 | aspath_unintern(&as4_path); | |
2740 | return BGP_ATTR_PARSE_ERROR; | |
2741 | } | |
2742 | ||
2743 | /* At this stage, we have done all fiddling with as4, and the | |
2744 | * resulting info is in attr->aggregator resp. attr->aspath | |
2745 | * so we can chuck as4_aggregator and as4_path alltogether in | |
2746 | * order to save memory | |
2747 | */ | |
2748 | if (as4_path) { | |
2749 | aspath_unintern(&as4_path); /* unintern - it is in the hash */ | |
2750 | /* The flag that we got this is still there, but that does not | |
2751 | * do any trouble | |
2752 | */ | |
2753 | } | |
2754 | /* | |
2755 | * The "rest" of the code does nothing with as4_aggregator. | |
2756 | * there is no memory attached specifically which is not part | |
2757 | * of the attr. | |
2758 | * so ignoring just means do nothing. | |
2759 | */ | |
2760 | /* | |
2761 | * Finally do the checks on the aspath we did not do yet | |
2762 | * because we waited for a potentially synthesized aspath. | |
2763 | */ | |
2764 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
2765 | ret = bgp_attr_aspath_check(peer, attr); | |
2766 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2767 | return ret; | |
2768 | } | |
2769 | /* Finally intern unknown attribute. */ | |
2770 | if (attr->transit) | |
2771 | attr->transit = transit_intern(attr->transit); | |
2772 | if (attr->encap_subtlvs) | |
2773 | attr->encap_subtlvs = | |
2774 | encap_intern(attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 2775 | #if ENABLE_BGP_VNC |
d62a17ae | 2776 | if (attr->vnc_subtlvs) |
2777 | attr->vnc_subtlvs = | |
2778 | encap_intern(attr->vnc_subtlvs, VNC_SUBTLV_TYPE); | |
bede7744 | 2779 | #endif |
718e3744 | 2780 | |
d62a17ae | 2781 | return BGP_ATTR_PARSE_PROCEED; |
2782 | } | |
2783 | ||
f4bd90c5 LK |
2784 | /* |
2785 | * Extract the tunnel type from extended community | |
2786 | */ | |
2787 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 2788 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
2789 | { |
2790 | struct ecommunity *ecom; | |
2791 | int i; | |
2792 | if (!attr) | |
fa346686 | 2793 | return; |
f4bd90c5 LK |
2794 | |
2795 | ecom = attr->ecommunity; | |
2796 | if (!ecom || !ecom->size) | |
fa346686 | 2797 | return; |
f4bd90c5 LK |
2798 | |
2799 | for (i = 0; i < ecom->size; i++) { | |
2800 | uint8_t *pnt; | |
2801 | uint8_t type, sub_type; | |
2802 | ||
2803 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
2804 | type = pnt[0]; | |
2805 | sub_type = pnt[1]; | |
2806 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
2807 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
2808 | continue; | |
2809 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 2810 | return; |
f4bd90c5 LK |
2811 | } |
2812 | ||
fa346686 | 2813 | return; |
f4bd90c5 LK |
2814 | } |
2815 | ||
d62a17ae | 2816 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
2817 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
2818 | struct attr *attr) | |
2819 | { | |
2820 | size_t sizep; | |
2821 | iana_afi_t pkt_afi; | |
5c525538 | 2822 | iana_safi_t pkt_safi; |
d62a17ae | 2823 | afi_t nh_afi; |
2824 | ||
2825 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
2826 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
2827 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
2828 | sizep = stream_get_endp(s); | |
2829 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
2830 | ||
2831 | ||
2832 | /* Convert AFI, SAFI to values for packet. */ | |
2833 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
2834 | ||
2835 | stream_putw(s, pkt_afi); /* AFI */ | |
2836 | stream_putc(s, pkt_safi); /* SAFI */ | |
2837 | ||
2838 | /* Nexthop AFI */ | |
ce78a6fb | 2839 | if (afi == AFI_IP |
2840 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST)) | |
d62a17ae | 2841 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
d62a17ae | 2842 | else |
2843 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
2844 | ||
2845 | /* Nexthop */ | |
2846 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
2847 | switch (nh_afi) { | |
2848 | case AFI_IP: | |
2849 | switch (safi) { | |
2850 | case SAFI_UNICAST: | |
2851 | case SAFI_MULTICAST: | |
2852 | case SAFI_LABELED_UNICAST: | |
2853 | stream_putc(s, 4); | |
2854 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
2855 | break; | |
2856 | case SAFI_MPLS_VPN: | |
2857 | stream_putc(s, 12); | |
2858 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2859 | stream_putl(s, 0); | |
2860 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2861 | break; | |
2862 | case SAFI_ENCAP: | |
2863 | case SAFI_EVPN: | |
2864 | stream_putc(s, 4); | |
2865 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
2866 | break; | |
7c40bf39 | 2867 | case SAFI_FLOWSPEC: |
2868 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2869 | default: |
2870 | break; | |
2871 | } | |
2872 | break; | |
2873 | case AFI_IP6: | |
2874 | switch (safi) { | |
2875 | case SAFI_UNICAST: | |
2876 | case SAFI_MULTICAST: | |
2877 | case SAFI_LABELED_UNICAST: | |
2878 | case SAFI_EVPN: { | |
2879 | if (attr->mp_nexthop_len | |
2880 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2881 | stream_putc(s, | |
2882 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
2883 | stream_put(s, &attr->mp_nexthop_global, | |
2884 | IPV6_MAX_BYTELEN); | |
2885 | stream_put(s, &attr->mp_nexthop_local, | |
2886 | IPV6_MAX_BYTELEN); | |
2887 | } else { | |
2888 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2889 | stream_put(s, &attr->mp_nexthop_global, | |
2890 | IPV6_MAX_BYTELEN); | |
2891 | } | |
2892 | } break; | |
2893 | case SAFI_MPLS_VPN: { | |
2894 | if (attr->mp_nexthop_len | |
2895 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
2896 | stream_putc(s, 24); | |
2897 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2898 | stream_putl(s, 0); | |
2899 | stream_put(s, &attr->mp_nexthop_global, | |
2900 | IPV6_MAX_BYTELEN); | |
2901 | } else if (attr->mp_nexthop_len | |
2902 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2903 | stream_putc(s, 48); | |
2904 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2905 | stream_putl(s, 0); | |
2906 | stream_put(s, &attr->mp_nexthop_global, | |
2907 | IPV6_MAX_BYTELEN); | |
2908 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
2909 | stream_putl(s, 0); | |
2910 | stream_put(s, &attr->mp_nexthop_local, | |
2911 | IPV6_MAX_BYTELEN); | |
2912 | } | |
2913 | } break; | |
2914 | case SAFI_ENCAP: | |
2915 | stream_putc(s, IPV6_MAX_BYTELEN); | |
2916 | stream_put(s, &attr->mp_nexthop_global, | |
2917 | IPV6_MAX_BYTELEN); | |
2918 | break; | |
7c40bf39 | 2919 | case SAFI_FLOWSPEC: |
2920 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 2921 | default: |
2922 | break; | |
2923 | } | |
2924 | break; | |
8c71e481 | 2925 | default: |
a83da8e1 | 2926 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 2927 | flog_err( |
e50f7cfd | 2928 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
2929 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
2930 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 2931 | break; |
2932 | } | |
2933 | ||
2934 | /* SNPA */ | |
2935 | stream_putc(s, 0); | |
2936 | return sizep; | |
2937 | } | |
2938 | ||
2939 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
2940 | struct prefix *p, struct prefix_rd *prd, | |
d7c0a89a QY |
2941 | mpls_label_t *label, uint32_t num_labels, |
2942 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 2943 | struct attr *attr) |
d62a17ae | 2944 | { |
2945 | if (safi == SAFI_MPLS_VPN) { | |
2946 | if (addpath_encode) | |
2947 | stream_putl(s, addpath_tx_id); | |
2948 | /* Label, RD, Prefix write. */ | |
2949 | stream_putc(s, p->prefixlen + 88); | |
2950 | stream_put(s, label, BGP_LABEL_BYTES); | |
2951 | stream_put(s, prd->val, 8); | |
2952 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
2953 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
2954 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
2955 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
2956 | addpath_encode, addpath_tx_id); | |
d62a17ae | 2957 | } else if (safi == SAFI_LABELED_UNICAST) { |
2958 | /* Prefix write with label. */ | |
2959 | stream_put_labeled_prefix(s, p, label); | |
7c40bf39 | 2960 | } else if (safi == SAFI_FLOWSPEC) { |
2961 | if (PSIZE (p->prefixlen)+2 < FLOWSPEC_NLRI_SIZELIMIT) | |
2962 | stream_putc(s, PSIZE (p->prefixlen)+2); | |
2963 | else | |
2964 | stream_putw(s, (PSIZE (p->prefixlen)+2)|(0xf<<12)); | |
2965 | stream_putc(s, 2);/* Filter type */ | |
2966 | stream_putc(s, p->prefixlen);/* Prefix length */ | |
2967 | stream_put(s, &p->u.prefix, PSIZE (p->prefixlen)); | |
d62a17ae | 2968 | } else |
2969 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
2970 | } | |
2971 | ||
2972 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, struct prefix *p) | |
2973 | { | |
2974 | int size = PSIZE(p->prefixlen); | |
2975 | if (safi == SAFI_MPLS_VPN) | |
2976 | size += 88; | |
2977 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) | |
2978 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
2979 | // type-5 | |
2980 | return size; | |
8c71e481 PM |
2981 | } |
2982 | ||
f4c89855 | 2983 | /* |
65efcfce | 2984 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 2985 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 2986 | * almost the same TLV format |
f4c89855 | 2987 | */ |
d62a17ae | 2988 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
2989 | struct stream *s, struct attr *attr, | |
2990 | uint8_t attrtype) | |
2991 | { | |
2992 | unsigned int attrlenfield = 0; | |
2993 | unsigned int attrhdrlen = 0; | |
2994 | struct bgp_attr_encap_subtlv *subtlvs; | |
2995 | struct bgp_attr_encap_subtlv *st; | |
2996 | const char *attrname; | |
2997 | ||
9d303b37 DL |
2998 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
2999 | && (!attr->encap_tunneltype | |
3000 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 3001 | return; |
3002 | ||
3003 | switch (attrtype) { | |
f4c89855 | 3004 | case BGP_ATTR_ENCAP: |
d62a17ae | 3005 | attrname = "Tunnel Encap"; |
3006 | subtlvs = attr->encap_subtlvs; | |
3007 | if (subtlvs == NULL) /* nothing to do */ | |
3008 | return; | |
3009 | /* | |
3010 | * The tunnel encap attr has an "outer" tlv. | |
3011 | * T = tunneltype, | |
3012 | * L = total length of subtlvs, | |
3013 | * V = concatenated subtlvs. | |
3014 | */ | |
3015 | attrlenfield = 2 + 2; /* T + L */ | |
3016 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
3017 | break; | |
f4c89855 | 3018 | |
943d595a | 3019 | #if ENABLE_BGP_VNC_ATTR |
65efcfce | 3020 | case BGP_ATTR_VNC: |
d62a17ae | 3021 | attrname = "VNC"; |
3022 | subtlvs = attr->vnc_subtlvs; | |
3023 | if (subtlvs == NULL) /* nothing to do */ | |
3024 | return; | |
3025 | attrlenfield = 0; /* no outer T + L */ | |
3026 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
3027 | break; | |
65efcfce LB |
3028 | #endif |
3029 | ||
f4c89855 | 3030 | default: |
d62a17ae | 3031 | assert(0); |
3032 | } | |
3033 | ||
3034 | /* compute attr length */ | |
3035 | for (st = subtlvs; st; st = st->next) { | |
3036 | attrlenfield += (attrhdrlen + st->length); | |
3037 | } | |
3038 | ||
3039 | if (attrlenfield > 0xffff) { | |
3040 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
3041 | attrname, attrlenfield); | |
3042 | return; | |
3043 | } | |
3044 | ||
3045 | if (attrlenfield > 0xff) { | |
3046 | /* 2-octet length field */ | |
996c9314 LB |
3047 | stream_putc(s, |
3048 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3049 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3050 | stream_putc(s, attrtype); |
3051 | stream_putw(s, attrlenfield & 0xffff); | |
3052 | } else { | |
3053 | /* 1-octet length field */ | |
3054 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
3055 | stream_putc(s, attrtype); | |
3056 | stream_putc(s, attrlenfield & 0xff); | |
3057 | } | |
3058 | ||
3059 | if (attrtype == BGP_ATTR_ENCAP) { | |
3060 | /* write outer T+L */ | |
3061 | stream_putw(s, attr->encap_tunneltype); | |
3062 | stream_putw(s, attrlenfield - 4); | |
3063 | } | |
3064 | ||
3065 | /* write each sub-tlv */ | |
3066 | for (st = subtlvs; st; st = st->next) { | |
3067 | if (attrtype == BGP_ATTR_ENCAP) { | |
3068 | stream_putc(s, st->type); | |
3069 | stream_putc(s, st->length); | |
65efcfce | 3070 | #if ENABLE_BGP_VNC |
d62a17ae | 3071 | } else { |
3072 | stream_putw(s, st->type); | |
3073 | stream_putw(s, st->length); | |
65efcfce | 3074 | #endif |
d62a17ae | 3075 | } |
3076 | stream_put(s, st->value, st->length); | |
3077 | } | |
f4c89855 | 3078 | } |
f4c89855 | 3079 | |
d62a17ae | 3080 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 3081 | { |
d62a17ae | 3082 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
3083 | the attr length */ | |
3084 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
3085 | } |
3086 | ||
6b5a72a3 DA |
3087 | static int bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
3088 | { | |
3089 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
3090 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
3091 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3092 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
3093 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3094 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
3095 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3096 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
3097 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3098 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3099 | return 1; | |
3100 | return 0; | |
3101 | } | |
3102 | ||
718e3744 | 3103 | /* Make attribute packet. */ |
d62a17ae | 3104 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
3105 | struct stream *s, struct attr *attr, | |
3106 | struct bpacket_attr_vec_arr *vecarr, | |
3107 | struct prefix *p, afi_t afi, safi_t safi, | |
3108 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
3109 | mpls_label_t *label, uint32_t num_labels, |
3110 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 3111 | { |
3112 | size_t cp; | |
3113 | size_t aspath_sizep; | |
3114 | struct aspath *aspath; | |
3115 | int send_as4_path = 0; | |
3116 | int send_as4_aggregator = 0; | |
3117 | int use32bit = (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0; | |
3118 | ||
3119 | if (!bgp) | |
3120 | bgp = peer->bgp; | |
3121 | ||
3122 | /* Remember current pointer. */ | |
3123 | cp = stream_get_endp(s); | |
3124 | ||
3125 | if (p | |
3126 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3127 | && !peer_cap_enhe(peer, afi, safi))) { | |
3128 | size_t mpattrlen_pos = 0; | |
3129 | ||
3130 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3131 | vecarr, attr); | |
996c9314 LB |
3132 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3133 | num_labels, addpath_encode, | |
3134 | addpath_tx_id, attr); | |
d62a17ae | 3135 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3136 | } |
d62a17ae | 3137 | |
3138 | /* Origin attribute. */ | |
3139 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3140 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3141 | stream_putc(s, 1); | |
3142 | stream_putc(s, attr->origin); | |
3143 | ||
3144 | /* AS path attribute. */ | |
3145 | ||
3146 | /* If remote-peer is EBGP */ | |
3147 | if (peer->sort == BGP_PEER_EBGP | |
3148 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3149 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3150 | || attr->aspath->segments == NULL) | |
3151 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3152 | PEER_FLAG_RSERVER_CLIENT))) { | |
3153 | aspath = aspath_dup(attr->aspath); | |
3154 | ||
3155 | /* Even though we may not be configured for confederations we | |
3156 | * may have | |
3157 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3158 | aspath = aspath_delete_confed_seq(aspath); | |
3159 | ||
3160 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3161 | /* Stuff our path CONFED_ID on the front */ | |
3162 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3163 | } else { | |
3164 | if (peer->change_local_as) { | |
3165 | /* If replace-as is specified, we only use the | |
3166 | change_local_as when | |
3167 | advertising routes. */ | |
6b5a72a3 DA |
3168 | if (!CHECK_FLAG(peer->flags, |
3169 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
3170 | if (bgp_append_local_as(peer, afi, | |
3171 | safi)) | |
3172 | aspath = aspath_add_seq( | |
3173 | aspath, peer->local_as); | |
d62a17ae | 3174 | aspath = aspath_add_seq(aspath, |
3175 | peer->change_local_as); | |
3176 | } else { | |
3177 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3178 | } | |
3179 | } | |
3180 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3181 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3182 | * thing */ | |
3183 | aspath = aspath_dup(attr->aspath); | |
3184 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3185 | } else | |
3186 | aspath = attr->aspath; | |
3187 | ||
3188 | /* If peer is not AS4 capable, then: | |
3189 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3190 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3191 | * segment | |
3192 | * types are in it (i.e. exclude them if they are there) | |
3193 | * AND do this only if there is at least one asnum > 65535 in the | |
3194 | * path! | |
3195 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3196 | * change | |
3197 | * all ASnums > 65535 to BGP_AS_TRANS | |
3198 | */ | |
3199 | ||
3200 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3201 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3202 | aspath_sizep = stream_get_endp(s); | |
3203 | stream_putw(s, 0); | |
3204 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3205 | ||
3206 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3207 | * in the path | |
3208 | */ | |
3209 | if (!use32bit && aspath_has_as4(aspath)) | |
3210 | send_as4_path = | |
3211 | 1; /* we'll do this later, at the correct place */ | |
3212 | ||
3213 | /* Nexthop attribute. */ | |
3214 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3215 | && !peer_cap_enhe(peer, afi, safi)) { | |
3216 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { | |
3217 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3218 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3219 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3220 | attr); | |
3221 | stream_putc(s, 4); | |
3222 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3223 | } else if (peer_cap_enhe(from, afi, safi)) { | |
3224 | /* | |
3225 | * Likely this is the case when an IPv4 prefix was | |
3226 | * received with | |
3227 | * Extended Next-hop capability and now being advertised | |
3228 | * to | |
3229 | * non-ENHE peers. | |
3230 | * Setting the mandatory (ipv4) next-hop attribute here | |
3231 | * to enable | |
3232 | * implicit next-hop self with correct (ipv4 address | |
3233 | * family). | |
3234 | */ | |
3235 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3236 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3237 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3238 | NULL); | |
3239 | stream_putc(s, 4); | |
3240 | stream_put_ipv4(s, 0); | |
3241 | } | |
718e3744 | 3242 | } |
d62a17ae | 3243 | |
3244 | /* MED attribute. */ | |
3245 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3246 | || bgp->maxmed_active) { | |
3247 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3248 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3249 | stream_putc(s, 4); | |
3250 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3251 | : attr->med)); | |
3252 | } | |
3253 | ||
3254 | /* Local preference. */ | |
3255 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3256 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3257 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3258 | stream_putc(s, 4); | |
3259 | stream_putl(s, attr->local_pref); | |
3260 | } | |
3261 | ||
3262 | /* Atomic aggregate. */ | |
3263 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3264 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3265 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3266 | stream_putc(s, 0); | |
3267 | } | |
3268 | ||
3269 | /* Aggregator. */ | |
3270 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3271 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3272 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3273 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3274 | ||
3275 | if (use32bit) { | |
3276 | /* AS4 capable peer */ | |
3277 | stream_putc(s, 8); | |
3278 | stream_putl(s, attr->aggregator_as); | |
3279 | } else { | |
3280 | /* 2-byte AS peer */ | |
3281 | stream_putc(s, 6); | |
3282 | ||
3283 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3284 | * used? */ | |
3285 | if (attr->aggregator_as > 65535) { | |
3286 | stream_putw(s, BGP_AS_TRANS); | |
3287 | ||
3288 | /* we have to send AS4_AGGREGATOR, too. | |
3289 | * we'll do that later in order to send | |
3290 | * attributes in ascending | |
3291 | * order. | |
3292 | */ | |
3293 | send_as4_aggregator = 1; | |
3294 | } else | |
d7c0a89a | 3295 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 3296 | } |
3297 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3298 | } | |
3299 | ||
3300 | /* Community attribute. */ | |
3301 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3302 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3303 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3304 | stream_putc(s, |
3305 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3306 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3307 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3308 | stream_putw(s, attr->community->size * 4); | |
3309 | } else { | |
996c9314 LB |
3310 | stream_putc(s, |
3311 | BGP_ATTR_FLAG_OPTIONAL | |
3312 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3313 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3314 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3315 | } |
d62a17ae | 3316 | stream_put(s, attr->community->val, attr->community->size * 4); |
3317 | } | |
3318 | ||
3319 | /* | |
3320 | * Large Community attribute. | |
3321 | */ | |
3322 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3323 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3324 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3325 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3326 | stream_putc(s, |
3327 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3328 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3329 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3330 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3331 | } else { |
996c9314 LB |
3332 | stream_putc(s, |
3333 | BGP_ATTR_FLAG_OPTIONAL | |
3334 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3335 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3336 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3337 | } |
d62a17ae | 3338 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3339 | lcom_length(attr->lcommunity)); |
d62a17ae | 3340 | } |
4372df71 | 3341 | |
d62a17ae | 3342 | /* Route Reflector. */ |
3343 | if (peer->sort == BGP_PEER_IBGP && from | |
3344 | && from->sort == BGP_PEER_IBGP) { | |
3345 | /* Originator ID. */ | |
3346 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3347 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3348 | stream_putc(s, 4); | |
3349 | ||
3350 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3351 | stream_put_in_addr(s, &attr->originator_id); | |
3352 | else | |
3353 | stream_put_in_addr(s, &from->remote_id); | |
3354 | ||
3355 | /* Cluster list. */ | |
3356 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3357 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
3358 | ||
3359 | if (attr->cluster) { | |
3360 | stream_putc(s, attr->cluster->length + 4); | |
3361 | /* If this peer configuration's parent BGP has | |
3362 | * cluster_id. */ | |
3363 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3364 | stream_put_in_addr(s, &bgp->cluster_id); | |
3365 | else | |
3366 | stream_put_in_addr(s, &bgp->router_id); | |
3367 | stream_put(s, attr->cluster->list, | |
3368 | attr->cluster->length); | |
3369 | } else { | |
3370 | stream_putc(s, 4); | |
3371 | /* If this peer configuration's parent BGP has | |
3372 | * cluster_id. */ | |
3373 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
3374 | stream_put_in_addr(s, &bgp->cluster_id); | |
3375 | else | |
3376 | stream_put_in_addr(s, &bgp->router_id); | |
3377 | } | |
3378 | } | |
4372df71 | 3379 | |
d62a17ae | 3380 | /* Extended Communities attribute. */ |
3381 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
3382 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
3383 | if (peer->sort == BGP_PEER_IBGP | |
3384 | || peer->sort == BGP_PEER_CONFED) { | |
3385 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
3386 | stream_putc(s, |
3387 | BGP_ATTR_FLAG_OPTIONAL | |
3388 | | BGP_ATTR_FLAG_TRANS | |
3389 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3390 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3391 | stream_putw(s, attr->ecommunity->size * 8); | |
3392 | } else { | |
996c9314 LB |
3393 | stream_putc(s, |
3394 | BGP_ATTR_FLAG_OPTIONAL | |
3395 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3396 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
3397 | stream_putc(s, attr->ecommunity->size * 8); | |
3398 | } | |
3399 | stream_put(s, attr->ecommunity->val, | |
3400 | attr->ecommunity->size * 8); | |
3401 | } else { | |
d7c0a89a | 3402 | uint8_t *pnt; |
d62a17ae | 3403 | int tbit; |
3404 | int ecom_tr_size = 0; | |
3405 | int i; | |
3406 | ||
3407 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3408 | pnt = attr->ecommunity->val + (i * 8); | |
3409 | tbit = *pnt; | |
3410 | ||
3411 | if (CHECK_FLAG(tbit, | |
3412 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3413 | continue; | |
3414 | ||
3415 | ecom_tr_size++; | |
3416 | } | |
3417 | ||
3418 | if (ecom_tr_size) { | |
3419 | if (ecom_tr_size * 8 > 255) { | |
3420 | stream_putc( | |
3421 | s, | |
3422 | BGP_ATTR_FLAG_OPTIONAL | |
3423 | | BGP_ATTR_FLAG_TRANS | |
3424 | | BGP_ATTR_FLAG_EXTLEN); | |
3425 | stream_putc(s, | |
3426 | BGP_ATTR_EXT_COMMUNITIES); | |
3427 | stream_putw(s, ecom_tr_size * 8); | |
3428 | } else { | |
3429 | stream_putc( | |
3430 | s, | |
3431 | BGP_ATTR_FLAG_OPTIONAL | |
3432 | | BGP_ATTR_FLAG_TRANS); | |
3433 | stream_putc(s, | |
3434 | BGP_ATTR_EXT_COMMUNITIES); | |
3435 | stream_putc(s, ecom_tr_size * 8); | |
3436 | } | |
3437 | ||
3438 | for (i = 0; i < attr->ecommunity->size; i++) { | |
3439 | pnt = attr->ecommunity->val + (i * 8); | |
3440 | tbit = *pnt; | |
3441 | ||
3442 | if (CHECK_FLAG( | |
3443 | tbit, | |
3444 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
3445 | continue; | |
3446 | ||
3447 | stream_put(s, pnt, 8); | |
3448 | } | |
3449 | } | |
3450 | } | |
3451 | } | |
4372df71 | 3452 | |
d62a17ae | 3453 | /* Label index attribute. */ |
3454 | if (safi == SAFI_LABELED_UNICAST) { | |
3455 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 3456 | uint32_t label_index; |
d62a17ae | 3457 | |
3458 | label_index = attr->label_index; | |
3459 | ||
3460 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3461 | stream_putc(s, |
3462 | BGP_ATTR_FLAG_OPTIONAL | |
3463 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3464 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3465 | stream_putc(s, 10); | |
3466 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3467 | stream_putw(s, | |
3468 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3469 | stream_putc(s, 0); // reserved | |
3470 | stream_putw(s, 0); // flags | |
3471 | stream_putl(s, label_index); | |
3472 | } | |
4372df71 | 3473 | } |
d62a17ae | 3474 | } |
3475 | ||
3476 | if (send_as4_path) { | |
3477 | /* If the peer is NOT As4 capable, AND */ | |
3478 | /* there are ASnums > 65535 in path THEN | |
3479 | * give out AS4_PATH */ | |
3480 | ||
3481 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
3482 | * path segments! | |
3483 | * Hm, I wonder... confederation things *should* only be at | |
3484 | * the beginning of an aspath, right? Then we should use | |
3485 | * aspath_delete_confed_seq for this, because it is already | |
3486 | * there! (JK) | |
3487 | * Folks, talk to me: what is reasonable here!? | |
3488 | */ | |
3489 | aspath = aspath_delete_confed_seq(aspath); | |
3490 | ||
996c9314 LB |
3491 | stream_putc(s, |
3492 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3493 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3494 | stream_putc(s, BGP_ATTR_AS4_PATH); |
3495 | aspath_sizep = stream_get_endp(s); | |
3496 | stream_putw(s, 0); | |
3497 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
3498 | } | |
3499 | ||
3500 | if (aspath != attr->aspath) | |
3501 | aspath_free(aspath); | |
3502 | ||
3503 | if (send_as4_aggregator) { | |
3504 | /* send AS4_AGGREGATOR, at this place */ | |
3505 | /* this section of code moved here in order to ensure the | |
3506 | * correct | |
3507 | * *ascending* order of attributes | |
3508 | */ | |
3509 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3510 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
3511 | stream_putc(s, 8); | |
3512 | stream_putl(s, attr->aggregator_as); | |
3513 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3514 | } | |
3515 | ||
3516 | if (((afi == AFI_IP || afi == AFI_IP6) | |
3517 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
3518 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
3519 | /* Tunnel Encap attribute */ | |
3520 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 3521 | |
943d595a | 3522 | #if ENABLE_BGP_VNC_ATTR |
d62a17ae | 3523 | /* VNC attribute */ |
3524 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 3525 | #endif |
d62a17ae | 3526 | } |
587ff0fd | 3527 | |
a21bd7a3 DW |
3528 | /* PMSI Tunnel */ |
3529 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
3530 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3531 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
3532 | stream_putc(s, 9); // Length | |
3533 | stream_putc(s, 0); // Flags | |
d03239d0 | 3534 | stream_putc(s, attr->pmsi_tnl_type); |
996c9314 LB |
3535 | stream_put(s, &(attr->label), |
3536 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
3537 | stream_put_ipv4(s, attr->nexthop.s_addr); |
3538 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
3539 | } |
3540 | ||
d62a17ae | 3541 | /* Unknown transit attribute. */ |
3542 | if (attr->transit) | |
3543 | stream_put(s, attr->transit->val, attr->transit->length); | |
718e3744 | 3544 | |
d62a17ae | 3545 | /* Return total size of attribute. */ |
3546 | return stream_get_endp(s) - cp; | |
718e3744 | 3547 | } |
3548 | ||
d62a17ae | 3549 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 3550 | { |
d62a17ae | 3551 | unsigned long attrlen_pnt; |
3552 | iana_afi_t pkt_afi; | |
5c525538 | 3553 | iana_safi_t pkt_safi; |
718e3744 | 3554 | |
d62a17ae | 3555 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
3556 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3557 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 3558 | |
d62a17ae | 3559 | attrlen_pnt = stream_get_endp(s); |
3560 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 3561 | |
d62a17ae | 3562 | /* Convert AFI, SAFI to values for packet. */ |
3563 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 3564 | |
d62a17ae | 3565 | stream_putw(s, pkt_afi); |
3566 | stream_putc(s, pkt_safi); | |
9cabb64b | 3567 | |
d62a17ae | 3568 | return attrlen_pnt; |
8c71e481 | 3569 | } |
718e3744 | 3570 | |
d62a17ae | 3571 | void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, afi_t afi, |
3572 | safi_t safi, struct prefix_rd *prd, | |
d7c0a89a QY |
3573 | mpls_label_t *label, uint32_t num_labels, |
3574 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 3575 | struct attr *attr) |
8c71e481 | 3576 | { |
d7c0a89a | 3577 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 3578 | |
b57ba6d2 | 3579 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 3580 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
3581 | num_labels = 1; |
3582 | } | |
cd1964ff | 3583 | |
d90b788e A |
3584 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
3585 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 3586 | } |
718e3744 | 3587 | |
d62a17ae | 3588 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 3589 | { |
d62a17ae | 3590 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 3591 | } |
3592 | ||
3593 | /* Initialization of attribute. */ | |
d62a17ae | 3594 | void bgp_attr_init(void) |
718e3744 | 3595 | { |
d62a17ae | 3596 | aspath_init(); |
3597 | attrhash_init(); | |
3598 | community_init(); | |
3599 | ecommunity_init(); | |
3600 | lcommunity_init(); | |
3601 | cluster_init(); | |
3602 | transit_init(); | |
3603 | encap_init(); | |
718e3744 | 3604 | } |
3605 | ||
d62a17ae | 3606 | void bgp_attr_finish(void) |
228da428 | 3607 | { |
d62a17ae | 3608 | aspath_finish(); |
3609 | attrhash_finish(); | |
3610 | community_finish(); | |
3611 | ecommunity_finish(); | |
3612 | lcommunity_finish(); | |
3613 | cluster_finish(); | |
3614 | transit_finish(); | |
3615 | encap_finish(); | |
228da428 CC |
3616 | } |
3617 | ||
718e3744 | 3618 | /* Make attribute packet. */ |
d62a17ae | 3619 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
3620 | struct prefix *prefix) | |
3621 | { | |
3622 | unsigned long cp; | |
3623 | unsigned long len; | |
3624 | size_t aspath_lenp; | |
3625 | struct aspath *aspath; | |
3626 | int addpath_encode = 0; | |
d7c0a89a | 3627 | uint32_t addpath_tx_id = 0; |
d62a17ae | 3628 | |
3629 | /* Remember current pointer. */ | |
3630 | cp = stream_get_endp(s); | |
3631 | ||
3632 | /* Place holder of length. */ | |
3633 | stream_putw(s, 0); | |
3634 | ||
3635 | /* Origin attribute. */ | |
3636 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3637 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3638 | stream_putc(s, 1); | |
3639 | stream_putc(s, attr->origin); | |
3640 | ||
3641 | aspath = attr->aspath; | |
3642 | ||
3643 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3644 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3645 | aspath_lenp = stream_get_endp(s); | |
3646 | stream_putw(s, 0); | |
3647 | ||
3648 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
3649 | ||
3650 | /* Nexthop attribute. */ | |
3651 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
3652 | if (prefix != NULL && prefix->family != AF_INET6) { | |
3653 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3654 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3655 | stream_putc(s, 4); | |
3656 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 3657 | } |
d62a17ae | 3658 | |
3659 | /* MED attribute. */ | |
3660 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
3661 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3662 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3663 | stream_putc(s, 4); | |
3664 | stream_putl(s, attr->med); | |
3665 | } | |
3666 | ||
3667 | /* Local preference. */ | |
3668 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
3669 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3670 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3671 | stream_putc(s, 4); | |
3672 | stream_putl(s, attr->local_pref); | |
3673 | } | |
3674 | ||
3675 | /* Atomic aggregate. */ | |
3676 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3677 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3678 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3679 | stream_putc(s, 0); | |
3680 | } | |
3681 | ||
3682 | /* Aggregator. */ | |
3683 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3684 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3685 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3686 | stream_putc(s, 8); | |
3687 | stream_putl(s, attr->aggregator_as); | |
3688 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3689 | } | |
3690 | ||
3691 | /* Community attribute. */ | |
3692 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
3693 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3694 | stream_putc(s, |
3695 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3696 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3697 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3698 | stream_putw(s, attr->community->size * 4); | |
3699 | } else { | |
996c9314 LB |
3700 | stream_putc(s, |
3701 | BGP_ATTR_FLAG_OPTIONAL | |
3702 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3703 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3704 | stream_putc(s, attr->community->size * 4); | |
3705 | } | |
3706 | stream_put(s, attr->community->val, attr->community->size * 4); | |
3707 | } | |
3708 | ||
3709 | /* Large Community attribute. */ | |
3710 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 3711 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3712 | stream_putc(s, |
3713 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3714 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3715 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3716 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3717 | } else { |
996c9314 LB |
3718 | stream_putc(s, |
3719 | BGP_ATTR_FLAG_OPTIONAL | |
3720 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3721 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3722 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3723 | } |
3724 | ||
996c9314 LB |
3725 | stream_put(s, attr->lcommunity->val, |
3726 | lcom_length(attr->lcommunity)); | |
d62a17ae | 3727 | } |
3728 | ||
3729 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
3730 | if (prefix != NULL && prefix->family == AF_INET6 | |
3731 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
3732 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
3733 | int sizep; | |
3734 | ||
3735 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3736 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3737 | sizep = stream_get_endp(s); | |
3738 | ||
3739 | /* MP header */ | |
3740 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
3741 | stream_putw(s, AFI_IP6); /* AFI */ | |
3742 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
3743 | ||
3744 | /* Next hop */ | |
3745 | stream_putc(s, attr->mp_nexthop_len); | |
3746 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
3747 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
3748 | stream_put(s, &attr->mp_nexthop_local, | |
3749 | IPV6_MAX_BYTELEN); | |
3750 | ||
3751 | /* SNPA */ | |
3752 | stream_putc(s, 0); | |
3753 | ||
3754 | /* Prefix */ | |
3755 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
3756 | addpath_tx_id); | |
3757 | ||
3758 | /* Set MP attribute length. */ | |
3759 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
3760 | } | |
3761 | ||
3762 | /* Prefix SID */ | |
3763 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
3764 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
3765 | stream_putc(s, |
3766 | BGP_ATTR_FLAG_OPTIONAL | |
3767 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3768 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
3769 | stream_putc(s, 10); | |
3770 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
3771 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
3772 | stream_putc(s, 0); // reserved | |
3773 | stream_putw(s, 0); // flags | |
3774 | stream_putl(s, attr->label_index); | |
3775 | } | |
3776 | } | |
3777 | ||
3778 | /* Return total size of attribute. */ | |
3779 | len = stream_get_endp(s) - cp - 2; | |
3780 | stream_putw_at(s, cp, len); | |
718e3744 | 3781 | } |