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718e3744 | 1 | /* BGP attributes management routines. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "linklist.h" | |
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "vector.h" | |
718e3744 | 27 | #include "stream.h" |
28 | #include "log.h" | |
29 | #include "hash.h" | |
c8e7b895 | 30 | #include "jhash.h" |
3f9c7369 | 31 | #include "queue.h" |
f4c89855 | 32 | #include "table.h" |
039f3a34 | 33 | #include "filter.h" |
4dcadbef | 34 | #include "command.h" |
e496b420 | 35 | #include "srv6.h" |
718e3744 | 36 | |
37 | #include "bgpd/bgpd.h" | |
38 | #include "bgpd/bgp_attr.h" | |
39 | #include "bgpd/bgp_route.h" | |
40 | #include "bgpd/bgp_aspath.h" | |
41 | #include "bgpd/bgp_community.h" | |
42 | #include "bgpd/bgp_debug.h" | |
14454c9f | 43 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 44 | #include "bgpd/bgp_label.h" |
718e3744 | 45 | #include "bgpd/bgp_packet.h" |
46 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 47 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 48 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 49 | #include "bgpd/bgp_encap_types.h" |
1e20238a | 50 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 51 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
52 | #include "bgp_encap_types.h" | |
53 | #include "bgp_vnc_types.h" | |
65efcfce | 54 | #endif |
b18825eb | 55 | #include "bgp_evpn.h" |
7c40bf39 | 56 | #include "bgp_flowspec_private.h" |
eee353c5 | 57 | #include "bgp_mac.h" |
6b0655a2 | 58 | |
718e3744 | 59 | /* Attribute strings for logging. */ |
d62a17ae | 60 | static const struct message attr_str[] = { |
61 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
62 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
63 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
64 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
65 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
66 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
67 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
68 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
69 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
70 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
71 | {BGP_ATTR_DPA, "DPA"}, | |
72 | {BGP_ATTR_ADVERTISER, "ADVERTISER"}, | |
73 | {BGP_ATTR_RCID_PATH, "RCID_PATH"}, | |
74 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, | |
75 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
76 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
77 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
78 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
79 | {BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT"}, | |
a21bd7a3 | 80 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 81 | {BGP_ATTR_ENCAP, "ENCAP"}, |
1e20238a | 82 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 83 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 84 | #endif |
d62a17ae | 85 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
86 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
9a659715 | 87 | {BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"}, |
d62a17ae | 88 | {0}}; |
afcb7679 | 89 | |
996c9314 LB |
90 | static const struct message attr_flag_str[] = { |
91 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
92 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
93 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
94 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
95 | this list */ | |
96 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
97 | {0}}; | |
6b0655a2 | 98 | |
9bddac4b | 99 | static struct hash *cluster_hash; |
718e3744 | 100 | |
d62a17ae | 101 | static void *cluster_hash_alloc(void *p) |
718e3744 | 102 | { |
d62a17ae | 103 | const struct cluster_list *val = (const struct cluster_list *)p; |
104 | struct cluster_list *cluster; | |
718e3744 | 105 | |
d62a17ae | 106 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
107 | cluster->length = val->length; | |
718e3744 | 108 | |
d62a17ae | 109 | if (cluster->length) { |
110 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
111 | memcpy(cluster->list, val->list, val->length); | |
112 | } else | |
113 | cluster->list = NULL; | |
718e3744 | 114 | |
d62a17ae | 115 | cluster->refcnt = 0; |
718e3744 | 116 | |
d62a17ae | 117 | return cluster; |
718e3744 | 118 | } |
119 | ||
120 | /* Cluster list related functions. */ | |
d62a17ae | 121 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 122 | { |
628565c7 | 123 | struct cluster_list tmp = {}; |
d62a17ae | 124 | struct cluster_list *cluster; |
718e3744 | 125 | |
d62a17ae | 126 | tmp.length = length; |
628565c7 | 127 | tmp.list = length == 0 ? NULL : pnt; |
718e3744 | 128 | |
d62a17ae | 129 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
130 | cluster->refcnt++; | |
131 | return cluster; | |
718e3744 | 132 | } |
133 | ||
3dc339cd | 134 | bool cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 135 | { |
d62a17ae | 136 | int i; |
137 | ||
138 | for (i = 0; i < cluster->length / 4; i++) | |
139 | if (cluster->list[i].s_addr == originator.s_addr) | |
3dc339cd DA |
140 | return true; |
141 | return false; | |
718e3744 | 142 | } |
143 | ||
d8b87afe | 144 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 145 | { |
d62a17ae | 146 | const struct cluster_list *cluster = p; |
718e3744 | 147 | |
d62a17ae | 148 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 149 | } |
150 | ||
74df8d6d | 151 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 152 | { |
d62a17ae | 153 | const struct cluster_list *cluster1 = p1; |
154 | const struct cluster_list *cluster2 = p2; | |
923de654 | 155 | |
f22ed884 QY |
156 | if (cluster1->list == cluster2->list) |
157 | return true; | |
158 | ||
159 | if (!cluster1->list || !cluster2->list) | |
160 | return false; | |
161 | ||
162 | if (cluster1->length != cluster2->length) | |
163 | return false; | |
164 | ||
165 | return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 166 | } |
167 | ||
d62a17ae | 168 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 169 | { |
0a22ddfb | 170 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 171 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 172 | } |
173 | ||
d62a17ae | 174 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 175 | { |
d62a17ae | 176 | struct cluster_list *find; |
718e3744 | 177 | |
d62a17ae | 178 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
179 | find->refcnt++; | |
718e3744 | 180 | |
d62a17ae | 181 | return find; |
718e3744 | 182 | } |
183 | ||
628565c7 | 184 | static void cluster_unintern(struct cluster_list **cluster) |
718e3744 | 185 | { |
628565c7 QY |
186 | if ((*cluster)->refcnt) |
187 | (*cluster)->refcnt--; | |
188 | ||
189 | if ((*cluster)->refcnt == 0) { | |
190 | void *p = hash_release(cluster_hash, *cluster); | |
191 | assert(p == *cluster); | |
192 | cluster_free(*cluster); | |
193 | *cluster = NULL; | |
d62a17ae | 194 | } |
718e3744 | 195 | } |
196 | ||
d62a17ae | 197 | static void cluster_init(void) |
718e3744 | 198 | { |
996c9314 | 199 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 200 | "BGP Cluster"); |
718e3744 | 201 | } |
228da428 | 202 | |
d62a17ae | 203 | static void cluster_finish(void) |
228da428 | 204 | { |
d62a17ae | 205 | hash_clean(cluster_hash, (void (*)(void *))cluster_free); |
206 | hash_free(cluster_hash); | |
207 | cluster_hash = NULL; | |
228da428 | 208 | } |
6b0655a2 | 209 | |
bede7744 | 210 | static struct hash *encap_hash = NULL; |
1e20238a | 211 | #ifdef ENABLE_BGP_VNC |
bede7744 LB |
212 | static struct hash *vnc_hash = NULL; |
213 | #endif | |
e496b420 HS |
214 | static struct hash *srv6_l3vpn_hash; |
215 | static struct hash *srv6_vpn_hash; | |
bede7744 | 216 | |
d62a17ae | 217 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 218 | { |
d62a17ae | 219 | struct bgp_attr_encap_subtlv *new; |
220 | struct bgp_attr_encap_subtlv *tail; | |
221 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 222 | |
d62a17ae | 223 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 224 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 225 | if (tail) { |
226 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
227 | tail = tail->next; | |
228 | } else { | |
229 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
230 | } | |
231 | assert(tail); | |
232 | memcpy(tail, p, size); | |
233 | tail->next = NULL; | |
f4c89855 | 234 | } |
f4c89855 | 235 | |
d62a17ae | 236 | return new; |
f4c89855 LB |
237 | } |
238 | ||
d62a17ae | 239 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 240 | { |
d62a17ae | 241 | struct bgp_attr_encap_subtlv *next; |
242 | while (p) { | |
243 | next = p->next; | |
244 | p->next = NULL; | |
245 | XFREE(MTYPE_ENCAP_TLV, p); | |
246 | p = next; | |
247 | } | |
f4c89855 LB |
248 | } |
249 | ||
d62a17ae | 250 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 251 | { |
d62a17ae | 252 | if (!attr) |
253 | return; | |
f4c89855 | 254 | |
d62a17ae | 255 | if (attr->encap_subtlvs) { |
256 | encap_free(attr->encap_subtlvs); | |
257 | attr->encap_subtlvs = NULL; | |
258 | } | |
1e20238a | 259 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
260 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
261 | bgp_attr_get_vnc_subtlvs(attr); | |
262 | ||
263 | if (vnc_subtlvs) { | |
264 | encap_free(vnc_subtlvs); | |
265 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 266 | } |
65efcfce | 267 | #endif |
f4c89855 LB |
268 | } |
269 | ||
270 | /* | |
271 | * Compare encap sub-tlv chains | |
272 | * | |
273 | * 1 = equivalent | |
274 | * 0 = not equivalent | |
275 | * | |
276 | * This algorithm could be made faster if needed | |
277 | */ | |
3dc339cd DA |
278 | static bool encap_same(const struct bgp_attr_encap_subtlv *h1, |
279 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 280 | { |
36de6e0e A |
281 | const struct bgp_attr_encap_subtlv *p; |
282 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 283 | |
d62a17ae | 284 | if (h1 == h2) |
3dc339cd | 285 | return true; |
d62a17ae | 286 | if (h1 == NULL || h2 == NULL) |
3dc339cd | 287 | return false; |
f4c89855 | 288 | |
d62a17ae | 289 | for (p = h1; p; p = p->next) { |
290 | for (q = h2; q; q = q->next) { | |
291 | if ((p->type == q->type) && (p->length == q->length) | |
292 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 293 | |
d62a17ae | 294 | break; |
295 | } | |
296 | } | |
297 | if (!q) | |
3dc339cd | 298 | return false; |
f4c89855 | 299 | } |
f4c89855 | 300 | |
d62a17ae | 301 | for (p = h2; p; p = p->next) { |
302 | for (q = h1; q; q = q->next) { | |
303 | if ((p->type == q->type) && (p->length == q->length) | |
304 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 305 | |
d62a17ae | 306 | break; |
307 | } | |
308 | } | |
309 | if (!q) | |
3dc339cd | 310 | return false; |
f4c89855 | 311 | } |
f4c89855 | 312 | |
3dc339cd | 313 | return true; |
f4c89855 LB |
314 | } |
315 | ||
d62a17ae | 316 | static void *encap_hash_alloc(void *p) |
bede7744 | 317 | { |
d62a17ae | 318 | /* Encap structure is already allocated. */ |
319 | return p; | |
bede7744 LB |
320 | } |
321 | ||
d62a17ae | 322 | typedef enum { |
323 | ENCAP_SUBTLV_TYPE, | |
1e20238a | 324 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 325 | VNC_SUBTLV_TYPE |
bede7744 LB |
326 | #endif |
327 | } encap_subtlv_type; | |
328 | ||
329 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 330 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 331 | { |
d62a17ae | 332 | struct bgp_attr_encap_subtlv *find; |
333 | struct hash *hash = encap_hash; | |
1e20238a | 334 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 335 | if (type == VNC_SUBTLV_TYPE) |
336 | hash = vnc_hash; | |
bede7744 LB |
337 | #endif |
338 | ||
d62a17ae | 339 | find = hash_get(hash, encap, encap_hash_alloc); |
340 | if (find != encap) | |
341 | encap_free(encap); | |
342 | find->refcnt++; | |
bede7744 | 343 | |
d62a17ae | 344 | return find; |
bede7744 LB |
345 | } |
346 | ||
d62a17ae | 347 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
348 | encap_subtlv_type type) | |
bede7744 | 349 | { |
d62a17ae | 350 | struct bgp_attr_encap_subtlv *encap = *encapp; |
351 | if (encap->refcnt) | |
352 | encap->refcnt--; | |
bede7744 | 353 | |
d62a17ae | 354 | if (encap->refcnt == 0) { |
355 | struct hash *hash = encap_hash; | |
1e20238a | 356 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 357 | if (type == VNC_SUBTLV_TYPE) |
358 | hash = vnc_hash; | |
bede7744 | 359 | #endif |
d62a17ae | 360 | hash_release(hash, encap); |
361 | encap_free(encap); | |
362 | *encapp = NULL; | |
363 | } | |
bede7744 LB |
364 | } |
365 | ||
d8b87afe | 366 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 367 | { |
d62a17ae | 368 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 369 | |
d62a17ae | 370 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
371 | } |
372 | ||
74df8d6d | 373 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 374 | { |
36de6e0e A |
375 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
376 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
377 | } |
378 | ||
d62a17ae | 379 | static void encap_init(void) |
bede7744 | 380 | { |
996c9314 | 381 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 382 | "BGP Encap Hash"); |
1e20238a | 383 | #ifdef ENABLE_BGP_VNC |
996c9314 | 384 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 385 | "BGP VNC Hash"); |
bede7744 LB |
386 | #endif |
387 | } | |
388 | ||
d62a17ae | 389 | static void encap_finish(void) |
bede7744 | 390 | { |
d62a17ae | 391 | hash_clean(encap_hash, (void (*)(void *))encap_free); |
392 | hash_free(encap_hash); | |
393 | encap_hash = NULL; | |
1e20238a | 394 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 395 | hash_clean(vnc_hash, (void (*)(void *))encap_free); |
396 | hash_free(vnc_hash); | |
397 | vnc_hash = NULL; | |
bede7744 LB |
398 | #endif |
399 | } | |
400 | ||
d62a17ae | 401 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 402 | { |
d62a17ae | 403 | if (!a1 && a2) |
404 | return false; | |
405 | if (!a2 && a1) | |
406 | return false; | |
407 | if (!a1 && !a2) | |
408 | return true; | |
6c924775 DS |
409 | |
410 | return !memcmp(bgp_attr_get_evpn_overlay(a1), | |
411 | bgp_attr_get_evpn_overlay(a2), | |
ea7741a0 | 412 | sizeof(struct bgp_route_evpn)); |
684a7227 PG |
413 | } |
414 | ||
718e3744 | 415 | /* Unknown transit attribute. */ |
9bddac4b | 416 | static struct hash *transit_hash; |
718e3744 | 417 | |
d62a17ae | 418 | static void transit_free(struct transit *transit) |
718e3744 | 419 | { |
0a22ddfb | 420 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 421 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 422 | } |
423 | ||
d62a17ae | 424 | static void *transit_hash_alloc(void *p) |
718e3744 | 425 | { |
d62a17ae | 426 | /* Transit structure is already allocated. */ |
427 | return p; | |
718e3744 | 428 | } |
429 | ||
d62a17ae | 430 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 431 | { |
d62a17ae | 432 | struct transit *find; |
718e3744 | 433 | |
d62a17ae | 434 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
435 | if (find != transit) | |
436 | transit_free(transit); | |
437 | find->refcnt++; | |
718e3744 | 438 | |
d62a17ae | 439 | return find; |
718e3744 | 440 | } |
441 | ||
547357c4 | 442 | static void transit_unintern(struct transit **transit) |
718e3744 | 443 | { |
547357c4 QY |
444 | if ((*transit)->refcnt) |
445 | (*transit)->refcnt--; | |
718e3744 | 446 | |
547357c4 QY |
447 | if ((*transit)->refcnt == 0) { |
448 | hash_release(transit_hash, *transit); | |
449 | transit_free(*transit); | |
450 | *transit = NULL; | |
d62a17ae | 451 | } |
718e3744 | 452 | } |
453 | ||
e496b420 HS |
454 | static void *srv6_l3vpn_hash_alloc(void *p) |
455 | { | |
456 | return p; | |
457 | } | |
458 | ||
459 | static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn) | |
460 | { | |
461 | XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn); | |
462 | } | |
463 | ||
464 | static struct bgp_attr_srv6_l3vpn * | |
465 | srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn) | |
466 | { | |
467 | struct bgp_attr_srv6_l3vpn *find; | |
468 | ||
469 | find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc); | |
470 | if (find != l3vpn) | |
471 | srv6_l3vpn_free(l3vpn); | |
472 | find->refcnt++; | |
473 | return find; | |
474 | } | |
475 | ||
476 | static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp) | |
477 | { | |
478 | struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp; | |
479 | ||
480 | if (l3vpn->refcnt) | |
481 | l3vpn->refcnt--; | |
482 | ||
483 | if (l3vpn->refcnt == 0) { | |
484 | hash_release(srv6_l3vpn_hash, l3vpn); | |
485 | srv6_l3vpn_free(l3vpn); | |
486 | *l3vpnp = NULL; | |
487 | } | |
488 | } | |
489 | ||
490 | static void *srv6_vpn_hash_alloc(void *p) | |
491 | { | |
492 | return p; | |
493 | } | |
494 | ||
495 | static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn) | |
496 | { | |
497 | XFREE(MTYPE_BGP_SRV6_VPN, vpn); | |
498 | } | |
499 | ||
500 | static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn) | |
501 | { | |
502 | struct bgp_attr_srv6_vpn *find; | |
503 | ||
504 | find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc); | |
505 | if (find != vpn) | |
506 | srv6_vpn_free(vpn); | |
507 | find->refcnt++; | |
508 | return find; | |
509 | } | |
510 | ||
511 | static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp) | |
512 | { | |
513 | struct bgp_attr_srv6_vpn *vpn = *vpnp; | |
514 | ||
515 | if (vpn->refcnt) | |
516 | vpn->refcnt--; | |
517 | ||
518 | if (vpn->refcnt == 0) { | |
519 | hash_release(srv6_vpn_hash, vpn); | |
520 | srv6_vpn_free(vpn); | |
521 | *vpnp = NULL; | |
522 | } | |
523 | } | |
524 | ||
525 | static uint32_t srv6_l3vpn_hash_key_make(const void *p) | |
526 | { | |
527 | const struct bgp_attr_srv6_l3vpn *l3vpn = p; | |
528 | uint32_t key = 0; | |
529 | ||
530 | key = jhash(&l3vpn->sid, 16, key); | |
531 | key = jhash_1word(l3vpn->sid_flags, key); | |
532 | key = jhash_1word(l3vpn->endpoint_behavior, key); | |
533 | return key; | |
534 | } | |
535 | ||
536 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
537 | { | |
538 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
539 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
540 | ||
541 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
542 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
543 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior; | |
544 | } | |
545 | ||
546 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
547 | const struct bgp_attr_srv6_l3vpn *h2) | |
548 | { | |
549 | if (h1 == h2) | |
550 | return true; | |
551 | else if (h1 == NULL || h2 == NULL) | |
552 | return false; | |
553 | else | |
554 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
555 | } | |
556 | ||
557 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
558 | { | |
559 | const struct bgp_attr_srv6_vpn *vpn = p; | |
560 | uint32_t key = 0; | |
561 | ||
562 | key = jhash(&vpn->sid, 16, key); | |
563 | key = jhash_1word(vpn->sid_flags, key); | |
564 | return key; | |
565 | } | |
566 | ||
567 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
568 | { | |
569 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
570 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
571 | ||
572 | return sid_same(&vpn1->sid, &vpn2->sid) | |
573 | && vpn1->sid_flags == vpn2->sid_flags; | |
574 | } | |
575 | ||
576 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
577 | const struct bgp_attr_srv6_vpn *h2) | |
578 | { | |
579 | if (h1 == h2) | |
580 | return true; | |
581 | else if (h1 == NULL || h2 == NULL) | |
582 | return false; | |
583 | else | |
584 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
585 | } | |
586 | ||
587 | static void srv6_init(void) | |
588 | { | |
589 | srv6_l3vpn_hash = | |
590 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
591 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
592 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
593 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
594 | } | |
595 | ||
596 | static void srv6_finish(void) | |
597 | { | |
598 | hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free); | |
599 | hash_free(srv6_l3vpn_hash); | |
600 | srv6_l3vpn_hash = NULL; | |
601 | hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
602 | hash_free(srv6_vpn_hash); | |
603 | srv6_vpn_hash = NULL; | |
604 | } | |
605 | ||
d8b87afe | 606 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 607 | { |
d62a17ae | 608 | const struct transit *transit = p; |
718e3744 | 609 | |
d62a17ae | 610 | return jhash(transit->val, transit->length, 0); |
718e3744 | 611 | } |
612 | ||
74df8d6d | 613 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 614 | { |
d62a17ae | 615 | const struct transit *transit1 = p1; |
616 | const struct transit *transit2 = p2; | |
923de654 | 617 | |
d62a17ae | 618 | return (transit1->length == transit2->length |
619 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 620 | } |
621 | ||
d62a17ae | 622 | static void transit_init(void) |
718e3744 | 623 | { |
996c9314 | 624 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 625 | "BGP Transit Hash"); |
718e3744 | 626 | } |
228da428 | 627 | |
d62a17ae | 628 | static void transit_finish(void) |
228da428 | 629 | { |
d62a17ae | 630 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
631 | hash_free(transit_hash); | |
632 | transit_hash = NULL; | |
228da428 | 633 | } |
6b0655a2 | 634 | |
718e3744 | 635 | /* Attribute hash routines. */ |
9bddac4b | 636 | static struct hash *attrhash; |
718e3744 | 637 | |
d62a17ae | 638 | unsigned long int attr_count(void) |
cbdfbaa5 | 639 | { |
d62a17ae | 640 | return attrhash->count; |
cbdfbaa5 PJ |
641 | } |
642 | ||
d62a17ae | 643 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 644 | { |
d62a17ae | 645 | return transit_hash->count; |
cbdfbaa5 PJ |
646 | } |
647 | ||
d8b87afe | 648 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 649 | { |
d62a17ae | 650 | const struct attr *attr = (struct attr *)p; |
651 | uint32_t key = 0; | |
c8e7b895 | 652 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 653 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 654 | |
0d0268a6 | 655 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
656 | MIX3(attr->local_pref, attr->aggregator_as, |
657 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
658 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
659 | attr->originator_id.s_addr); | |
660 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 661 | |
662 | if (attr->aspath) | |
663 | MIX(aspath_key_make(attr->aspath)); | |
664 | if (attr->community) | |
665 | MIX(community_hash_make(attr->community)); | |
666 | ||
667 | if (attr->lcommunity) | |
668 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
669 | if (attr->ecommunity) | |
670 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
d04ac434 DS |
671 | if (bgp_attr_get_ipv6_ecommunity(attr)) |
672 | MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr))); | |
779fee93 DS |
673 | if (bgp_attr_get_cluster(attr)) |
674 | MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr))); | |
04fb21e2 DS |
675 | if (bgp_attr_get_transit(attr)) |
676 | MIX(transit_hash_key_make(bgp_attr_get_transit(attr))); | |
d62a17ae | 677 | if (attr->encap_subtlvs) |
678 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
b83127e1 HS |
679 | if (attr->srv6_l3vpn) |
680 | MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn)); | |
681 | if (attr->srv6_vpn) | |
682 | MIX(srv6_vpn_hash_key_make(attr->srv6_vpn)); | |
1e20238a | 683 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
684 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
685 | bgp_attr_get_vnc_subtlvs(attr); | |
686 | if (vnc_subtlvs) | |
687 | MIX(encap_hash_key_make(vnc_subtlvs)); | |
bede7744 | 688 | #endif |
d62a17ae | 689 | MIX(attr->mp_nexthop_len); |
690 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
691 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 692 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 693 | MIX(attr->rmap_table_id); |
0789eb69 KM |
694 | MIX(attr->nh_type); |
695 | MIX(attr->bh_type); | |
d62a17ae | 696 | |
697 | return key; | |
698 | } | |
699 | ||
74df8d6d | 700 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 701 | { |
702 | const struct attr *attr1 = p1; | |
703 | const struct attr *attr2 = p2; | |
704 | ||
705 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
706 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
707 | && attr1->aspath == attr2->aspath | |
708 | && attr1->community == attr2->community && attr1->med == attr2->med | |
709 | && attr1->local_pref == attr2->local_pref | |
710 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
711 | if (attr1->aggregator_as == attr2->aggregator_as | |
712 | && attr1->aggregator_addr.s_addr | |
713 | == attr2->aggregator_addr.s_addr | |
714 | && attr1->weight == attr2->weight | |
715 | && attr1->tag == attr2->tag | |
716 | && attr1->label_index == attr2->label_index | |
717 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 718 | && attr1->ecommunity == attr2->ecommunity |
d04ac434 DS |
719 | && bgp_attr_get_ipv6_ecommunity(attr1) |
720 | == bgp_attr_get_ipv6_ecommunity(attr2) | |
d62a17ae | 721 | && attr1->lcommunity == attr2->lcommunity |
779fee93 DS |
722 | && bgp_attr_get_cluster(attr1) |
723 | == bgp_attr_get_cluster(attr2) | |
04fb21e2 DS |
724 | && bgp_attr_get_transit(attr1) |
725 | == bgp_attr_get_transit(attr2) | |
951745bd | 726 | && attr1->rmap_table_id == attr2->rmap_table_id |
d62a17ae | 727 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) |
728 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 729 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
730 | && encap_same(bgp_attr_get_vnc_subtlvs(attr1), |
731 | bgp_attr_get_vnc_subtlvs(attr2)) | |
65efcfce | 732 | #endif |
0d0268a6 LB |
733 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
734 | &attr2->mp_nexthop_global) | |
735 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
736 | &attr2->mp_nexthop_local) | |
737 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
738 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 739 | && IPV4_ADDR_SAME(&attr1->originator_id, |
740 | &attr2->originator_id) | |
77e62f2b | 741 | && overlay_index_same(attr1, attr2) |
0a50c248 | 742 | && !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) |
7904e9fd AK |
743 | && attr1->es_flags == attr2->es_flags |
744 | && attr1->mm_sync_seqnum == attr2->mm_sync_seqnum | |
74e2bd89 AK |
745 | && attr1->df_pref == attr2->df_pref |
746 | && attr1->df_alg == attr2->df_alg | |
77e62f2b | 747 | && attr1->nh_ifindex == attr2->nh_ifindex |
7b7d48e5 | 748 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex |
e496b420 HS |
749 | && attr1->distance == attr2->distance |
750 | && srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) | |
ef3e0d04 | 751 | && srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) |
0789eb69 KM |
752 | && attr1->srte_color == attr2->srte_color |
753 | && attr1->nh_type == attr2->nh_type | |
754 | && attr1->bh_type == attr2->bh_type) | |
74df8d6d | 755 | return true; |
d62a17ae | 756 | } |
aadc0905 | 757 | |
74df8d6d | 758 | return false; |
718e3744 | 759 | } |
760 | ||
d62a17ae | 761 | static void attrhash_init(void) |
718e3744 | 762 | { |
996c9314 LB |
763 | attrhash = |
764 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 765 | } |
766 | ||
289d2501 LB |
767 | /* |
768 | * special for hash_clean below | |
769 | */ | |
d62a17ae | 770 | static void attr_vfree(void *attr) |
289d2501 | 771 | { |
d62a17ae | 772 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
773 | } |
774 | ||
d62a17ae | 775 | static void attrhash_finish(void) |
228da428 | 776 | { |
d62a17ae | 777 | hash_clean(attrhash, attr_vfree); |
778 | hash_free(attrhash); | |
779 | attrhash = NULL; | |
228da428 CC |
780 | } |
781 | ||
e3b78da8 | 782 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 783 | { |
e3b78da8 | 784 | struct attr *attr = bucket->data; |
e496b420 | 785 | char sid_str[BUFSIZ]; |
718e3744 | 786 | |
23d0a753 | 787 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 HS |
788 | |
789 | sid_str[0] = '\0'; | |
790 | if (attr->srv6_l3vpn) | |
791 | inet_ntop(AF_INET6, &attr->srv6_l3vpn->sid, sid_str, BUFSIZ); | |
792 | else if (attr->srv6_vpn) | |
793 | inet_ntop(AF_INET6, &attr->srv6_vpn->sid, sid_str, BUFSIZ); | |
794 | ||
795 | vty_out(vty, | |
957f74c3 DS |
796 | "\tflags: %" PRIu64" distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %s\n", |
797 | attr->flag, attr->distance, attr->med, attr->local_pref, | |
798 | attr->origin, attr->weight, attr->label, sid_str); | |
718e3744 | 799 | } |
800 | ||
d62a17ae | 801 | void attr_show_all(struct vty *vty) |
718e3744 | 802 | { |
e3b78da8 | 803 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
804 | void *))attr_show_all_iterator, |
805 | vty); | |
718e3744 | 806 | } |
807 | ||
d62a17ae | 808 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 809 | { |
d62a17ae | 810 | struct attr *val = (struct attr *)p; |
811 | struct attr *attr; | |
718e3744 | 812 | |
d62a17ae | 813 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
814 | *attr = *val; | |
815 | if (val->encap_subtlvs) { | |
816 | val->encap_subtlvs = NULL; | |
817 | } | |
1e20238a | 818 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
819 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
820 | bgp_attr_get_vnc_subtlvs(val); | |
821 | ||
822 | if (vnc_subtlvs) | |
823 | bgp_attr_set_vnc_subtlvs(val, NULL); | |
65efcfce | 824 | #endif |
e496b420 HS |
825 | if (val->srv6_l3vpn) |
826 | val->srv6_l3vpn = NULL; | |
827 | if (val->srv6_vpn) | |
828 | val->srv6_vpn = NULL; | |
829 | ||
d62a17ae | 830 | attr->refcnt = 0; |
831 | return attr; | |
718e3744 | 832 | } |
833 | ||
834 | /* Internet argument attribute. */ | |
d62a17ae | 835 | struct attr *bgp_attr_intern(struct attr *attr) |
836 | { | |
837 | struct attr *find; | |
d04ac434 | 838 | struct ecommunity *ecomm; |
d62a17ae | 839 | |
840 | /* Intern referenced strucutre. */ | |
841 | if (attr->aspath) { | |
842 | if (!attr->aspath->refcnt) | |
843 | attr->aspath = aspath_intern(attr->aspath); | |
844 | else | |
845 | attr->aspath->refcnt++; | |
846 | } | |
847 | if (attr->community) { | |
848 | if (!attr->community->refcnt) | |
849 | attr->community = community_intern(attr->community); | |
850 | else | |
851 | attr->community->refcnt++; | |
852 | } | |
853 | ||
854 | if (attr->ecommunity) { | |
855 | if (!attr->ecommunity->refcnt) | |
856 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
857 | else | |
858 | attr->ecommunity->refcnt++; | |
859 | } | |
9a659715 | 860 | |
d04ac434 DS |
861 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
862 | if (ecomm) { | |
863 | if (!ecomm->refcnt) | |
864 | bgp_attr_set_ipv6_ecommunity(attr, | |
865 | ecommunity_intern(ecomm)); | |
9a659715 | 866 | else |
d04ac434 | 867 | ecomm->refcnt++; |
9a659715 PG |
868 | } |
869 | ||
d62a17ae | 870 | if (attr->lcommunity) { |
871 | if (!attr->lcommunity->refcnt) | |
872 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
873 | else | |
874 | attr->lcommunity->refcnt++; | |
875 | } | |
779fee93 DS |
876 | |
877 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); | |
878 | ||
879 | if (cluster) { | |
880 | if (!cluster->refcnt) | |
881 | bgp_attr_set_cluster(attr, cluster_intern(cluster)); | |
d62a17ae | 882 | else |
779fee93 | 883 | cluster->refcnt++; |
d62a17ae | 884 | } |
04fb21e2 DS |
885 | |
886 | struct transit *transit = bgp_attr_get_transit(attr); | |
887 | ||
888 | if (transit) { | |
889 | if (!transit->refcnt) | |
890 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
d62a17ae | 891 | else |
04fb21e2 | 892 | transit->refcnt++; |
d62a17ae | 893 | } |
894 | if (attr->encap_subtlvs) { | |
895 | if (!attr->encap_subtlvs->refcnt) | |
896 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
897 | ENCAP_SUBTLV_TYPE); | |
898 | else | |
899 | attr->encap_subtlvs->refcnt++; | |
900 | } | |
e496b420 HS |
901 | if (attr->srv6_l3vpn) { |
902 | if (!attr->srv6_l3vpn->refcnt) | |
903 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
904 | else | |
905 | attr->srv6_l3vpn->refcnt++; | |
906 | } | |
907 | if (attr->srv6_vpn) { | |
908 | if (!attr->srv6_vpn->refcnt) | |
909 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
910 | else | |
911 | attr->srv6_vpn->refcnt++; | |
912 | } | |
1e20238a | 913 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
914 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
915 | bgp_attr_get_vnc_subtlvs(attr); | |
916 | ||
917 | if (vnc_subtlvs) { | |
918 | if (!vnc_subtlvs->refcnt) | |
919 | bgp_attr_set_vnc_subtlvs( | |
920 | attr, | |
921 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
d62a17ae | 922 | else |
91ebf12c | 923 | vnc_subtlvs->refcnt++; |
d62a17ae | 924 | } |
aadc0905 | 925 | #endif |
bede7744 | 926 | |
dbbac180 DL |
927 | /* At this point, attr only contains intern'd pointers. that means |
928 | * if we find it in attrhash, it has all the same pointers and we | |
929 | * correctly updated the refcounts on these. | |
930 | * If we don't find it, we need to allocate a one because in all | |
931 | * cases this returns a new reference to a hashed attr, but the input | |
932 | * wasn't on hash. */ | |
d62a17ae | 933 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
934 | find->refcnt++; | |
935 | ||
936 | return find; | |
718e3744 | 937 | } |
938 | ||
939 | /* Make network statement's attribute. */ | |
d7c0a89a | 940 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 941 | { |
d62a17ae | 942 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 943 | |
d62a17ae | 944 | attr->origin = origin; |
945 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
946 | attr->aspath = aspath_empty(); | |
947 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
948 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
949 | attr->tag = 0; | |
950 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
951 | attr->label = MPLS_INVALID_LABEL; | |
952 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
953 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
954 | ||
955 | return attr; | |
718e3744 | 956 | } |
957 | ||
b5d58c32 | 958 | /* Create the attributes for an aggregate */ |
5f040085 DS |
959 | struct attr *bgp_attr_aggregate_intern( |
960 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
961 | struct community *community, struct ecommunity *ecommunity, | |
962 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
963 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 964 | { |
965 | struct attr attr; | |
966 | struct attr *new; | |
20894f50 | 967 | int ret; |
d62a17ae | 968 | |
969 | memset(&attr, 0, sizeof(struct attr)); | |
970 | ||
971 | /* Origin attribute. */ | |
972 | attr.origin = origin; | |
973 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
974 | ||
975 | /* AS path attribute. */ | |
976 | if (aspath) | |
977 | attr.aspath = aspath_intern(aspath); | |
978 | else | |
979 | attr.aspath = aspath_empty(); | |
980 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
981 | ||
982 | /* Next hop attribute. */ | |
983 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
984 | ||
985 | if (community) { | |
d7c0a89a | 986 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
987 | |
988 | /* If we are not shutting down ourselves and we are | |
989 | * aggregating a route that contains the GSHUT community we | |
990 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 991 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 992 | && community_include(community, gshut)) { |
7f323236 DW |
993 | community_del_val(community, &gshut); |
994 | } | |
995 | ||
d62a17ae | 996 | attr.community = community; |
997 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
998 | } | |
999 | ||
3da2cc32 DS |
1000 | if (ecommunity) { |
1001 | attr.ecommunity = ecommunity; | |
1002 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1003 | } | |
1004 | ||
dd18c5a9 DS |
1005 | if (lcommunity) { |
1006 | attr.lcommunity = lcommunity; | |
1007 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
1008 | } | |
1009 | ||
637e5ba4 | 1010 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 1011 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 1012 | |
d62a17ae | 1013 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
1014 | attr.label = MPLS_INVALID_LABEL; | |
1015 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1016 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 1017 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 1018 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
1019 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1020 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1021 | attr.aggregator_as = bgp->confed_id; | |
1022 | else | |
1023 | attr.aggregator_as = bgp->as; | |
1024 | attr.aggregator_addr = bgp->router_id; | |
1025 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
1026 | attr.label = MPLS_INVALID_LABEL; | |
1027 | ||
20894f50 DA |
1028 | /* Apply route-map */ |
1029 | if (aggregate->rmap.name) { | |
1030 | struct attr attr_tmp = attr; | |
1031 | struct bgp_path_info rmap_path; | |
1032 | ||
1033 | memset(&rmap_path, 0, sizeof(struct bgp_path_info)); | |
1034 | rmap_path.peer = bgp->peer_self; | |
1035 | rmap_path.attr = &attr_tmp; | |
1036 | ||
1037 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1038 | ||
1782514f | 1039 | ret = route_map_apply(aggregate->rmap.map, p, &rmap_path); |
20894f50 DA |
1040 | |
1041 | bgp->peer_self->rmap_type = 0; | |
1042 | ||
1043 | if (ret == RMAP_DENYMATCH) { | |
1044 | /* Free uninterned attribute. */ | |
1045 | bgp_attr_flush(&attr_tmp); | |
1046 | ||
1047 | /* Unintern original. */ | |
1048 | aspath_unintern(&attr.aspath); | |
1049 | return NULL; | |
1050 | } | |
1051 | ||
637e5ba4 | 1052 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1053 | bgp_attr_add_gshut_community(&attr_tmp); |
1054 | ||
1055 | new = bgp_attr_intern(&attr_tmp); | |
1056 | } else { | |
1057 | ||
637e5ba4 | 1058 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1059 | bgp_attr_add_gshut_community(&attr); |
1060 | ||
1061 | new = bgp_attr_intern(&attr); | |
1062 | } | |
d62a17ae | 1063 | |
1064 | aspath_unintern(&new->aspath); | |
1065 | return new; | |
718e3744 | 1066 | } |
1067 | ||
b881c707 | 1068 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1069 | void bgp_attr_unintern_sub(struct attr *attr) |
1070 | { | |
d04ac434 | 1071 | struct ecommunity *ecomm; |
779fee93 | 1072 | struct cluster_list *cluster; |
d04ac434 | 1073 | |
d62a17ae | 1074 | /* aspath refcount shoud be decrement. */ |
1075 | if (attr->aspath) | |
1076 | aspath_unintern(&attr->aspath); | |
1077 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
1078 | ||
1079 | if (attr->community) | |
1080 | community_unintern(&attr->community); | |
1081 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
1082 | ||
df7d4670 | 1083 | ecommunity_unintern(&attr->ecommunity); |
d62a17ae | 1084 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); |
1085 | ||
d04ac434 DS |
1086 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1087 | ecommunity_unintern(&ecomm); | |
9a659715 | 1088 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES)); |
d04ac434 | 1089 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a659715 | 1090 | |
d62a17ae | 1091 | if (attr->lcommunity) |
1092 | lcommunity_unintern(&attr->lcommunity); | |
1093 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
1094 | ||
779fee93 DS |
1095 | cluster = bgp_attr_get_cluster(attr); |
1096 | if (cluster) { | |
1097 | cluster_unintern(&cluster); | |
1098 | bgp_attr_set_cluster(attr, cluster); | |
1099 | } | |
d62a17ae | 1100 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1101 | ||
04fb21e2 DS |
1102 | struct transit *transit = bgp_attr_get_transit(attr); |
1103 | ||
1104 | if (transit) { | |
1105 | transit_unintern(&transit); | |
1106 | bgp_attr_set_transit(attr, transit); | |
1107 | } | |
d62a17ae | 1108 | |
1109 | if (attr->encap_subtlvs) | |
1110 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1111 | |
1e20238a | 1112 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1113 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1114 | bgp_attr_get_vnc_subtlvs(attr); | |
1115 | ||
1116 | if (vnc_subtlvs) { | |
1117 | encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1118 | bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs); | |
1119 | } | |
bede7744 | 1120 | #endif |
e496b420 HS |
1121 | |
1122 | if (attr->srv6_l3vpn) | |
1123 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1124 | ||
1125 | if (attr->srv6_vpn) | |
1126 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1127 | } |
1128 | ||
f46d8e1e DS |
1129 | /* |
1130 | * We have some show commands that let you experimentally | |
1131 | * apply a route-map. When we apply the route-map | |
1132 | * we are reseting values but not saving them for | |
1133 | * posterity via intern'ing( because route-maps don't | |
1134 | * do that) but at this point in time we need | |
1135 | * to compare the new attr to the old and if the | |
1136 | * routemap has changed it we need to, as Snoop Dog says, | |
1137 | * Drop it like it's hot | |
1138 | */ | |
1139 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
1140 | { | |
1141 | if (new->aspath != old->aspath) | |
1142 | aspath_free(new->aspath); | |
1143 | ||
1144 | if (new->community != old->community) | |
3c1f53de | 1145 | community_free(&new->community); |
f46d8e1e DS |
1146 | |
1147 | if (new->ecommunity != old->ecommunity) | |
1148 | ecommunity_free(&new->ecommunity); | |
1149 | ||
1150 | if (new->lcommunity != old->lcommunity) | |
1151 | lcommunity_free(&new->lcommunity); | |
b83127e1 HS |
1152 | |
1153 | if (new->srv6_l3vpn != old->srv6_l3vpn) { | |
1154 | srv6_l3vpn_free(new->srv6_l3vpn); | |
1155 | new->srv6_l3vpn = NULL; | |
1156 | } | |
1157 | ||
1158 | if (new->srv6_vpn != old->srv6_vpn) { | |
1159 | srv6_vpn_free(new->srv6_vpn); | |
1160 | new->srv6_vpn = NULL; | |
1161 | } | |
f46d8e1e DS |
1162 | } |
1163 | ||
718e3744 | 1164 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1165 | void bgp_attr_unintern(struct attr **pattr) |
1166 | { | |
1167 | struct attr *attr = *pattr; | |
1168 | struct attr *ret; | |
1169 | struct attr tmp; | |
1170 | ||
1171 | /* Decrement attribute reference. */ | |
1172 | attr->refcnt--; | |
1173 | ||
1174 | tmp = *attr; | |
1175 | ||
1176 | /* If reference becomes zero then free attribute object. */ | |
1177 | if (attr->refcnt == 0) { | |
1178 | ret = hash_release(attrhash, attr); | |
1179 | assert(ret != NULL); | |
1180 | XFREE(MTYPE_ATTR, attr); | |
1181 | *pattr = NULL; | |
1182 | } | |
1183 | ||
1184 | bgp_attr_unintern_sub(&tmp); | |
1185 | } | |
1186 | ||
1187 | void bgp_attr_flush(struct attr *attr) | |
1188 | { | |
d04ac434 | 1189 | struct ecommunity *ecomm; |
779fee93 | 1190 | struct cluster_list *cluster; |
d04ac434 | 1191 | |
d62a17ae | 1192 | if (attr->aspath && !attr->aspath->refcnt) { |
1193 | aspath_free(attr->aspath); | |
1194 | attr->aspath = NULL; | |
1195 | } | |
3c1f53de SMS |
1196 | if (attr->community && !attr->community->refcnt) |
1197 | community_free(&attr->community); | |
d62a17ae | 1198 | if (attr->ecommunity && !attr->ecommunity->refcnt) |
1199 | ecommunity_free(&attr->ecommunity); | |
d04ac434 DS |
1200 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1201 | if (ecomm && !ecomm->refcnt) | |
1202 | ecommunity_free(&ecomm); | |
1203 | bgp_attr_set_ipv6_ecommunity(attr, NULL); | |
d62a17ae | 1204 | if (attr->lcommunity && !attr->lcommunity->refcnt) |
1205 | lcommunity_free(&attr->lcommunity); | |
779fee93 DS |
1206 | |
1207 | cluster = bgp_attr_get_cluster(attr); | |
1208 | if (cluster && !cluster->refcnt) { | |
1209 | cluster_free(cluster); | |
1210 | bgp_attr_set_cluster(attr, NULL); | |
d62a17ae | 1211 | } |
04fb21e2 DS |
1212 | |
1213 | struct transit *transit = bgp_attr_get_transit(attr); | |
1214 | ||
1215 | if (transit && !transit->refcnt) { | |
1216 | transit_free(transit); | |
1217 | bgp_attr_set_transit(attr, NULL); | |
d62a17ae | 1218 | } |
1219 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1220 | encap_free(attr->encap_subtlvs); | |
1221 | attr->encap_subtlvs = NULL; | |
1222 | } | |
b83127e1 HS |
1223 | if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) { |
1224 | srv6_l3vpn_free(attr->srv6_l3vpn); | |
1225 | attr->srv6_l3vpn = NULL; | |
1226 | } | |
1227 | if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) { | |
1228 | srv6_vpn_free(attr->srv6_vpn); | |
1229 | attr->srv6_vpn = NULL; | |
1230 | } | |
1e20238a | 1231 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1232 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1233 | bgp_attr_get_vnc_subtlvs(attr); | |
1234 | ||
1235 | if (vnc_subtlvs && !vnc_subtlvs->refcnt) { | |
1236 | encap_free(vnc_subtlvs); | |
1237 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 1238 | } |
aadc0905 | 1239 | #endif |
718e3744 | 1240 | } |
1241 | ||
b881c707 PJ |
1242 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1243 | * avoid resetting sessions for malformed attributes which are | |
1244 | * are partial/optional and hence where the error likely was not | |
1245 | * introduced by the sending neighbour. | |
1246 | */ | |
1247 | static bgp_attr_parse_ret_t | |
d7c0a89a | 1248 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1249 | bgp_size_t length) |
1250 | { | |
1251 | struct peer *const peer = args->peer; | |
599f7b33 | 1252 | struct attr *const attr = args->attr; |
d7c0a89a | 1253 | const uint8_t flags = args->flags; |
d62a17ae | 1254 | /* startp and length must be special-cased, as whether or not to |
1255 | * send the attribute data with the NOTIFY depends on the error, | |
1256 | * the caller therefore signals this with the seperate length argument | |
1257 | */ | |
d7c0a89a | 1258 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1259 | |
599f7b33 DA |
1260 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1261 | char attr_str[BUFSIZ] = {0}; | |
1262 | ||
99ab4d23 | 1263 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1264 | |
1265 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1266 | } | |
1267 | ||
d62a17ae | 1268 | /* Only relax error handling for eBGP peers */ |
1269 | if (peer->sort != BGP_PEER_EBGP) { | |
1270 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1271 | notify_datap, length); | |
1272 | return BGP_ATTR_PARSE_ERROR; | |
1273 | } | |
1274 | ||
1275 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1276 | * still proceed but the caller hasn't read all the attribute. | |
1277 | */ | |
1278 | stream_set_getp(BGP_INPUT(peer), | |
1279 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1280 | + args->total); | |
1281 | ||
1282 | switch (args->type) { | |
1283 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1284 | * affect route selection, and can be safely ignored, then any such | |
1285 | * attributes which are malformed should just be ignored and the route | |
1286 | * processed as normal. | |
1287 | */ | |
1288 | case BGP_ATTR_AS4_AGGREGATOR: | |
1289 | case BGP_ATTR_AGGREGATOR: | |
1290 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1291 | return BGP_ATTR_PARSE_PROCEED; | |
1292 | ||
1293 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1294 | * selection, should be treat-as-withdraw. |
d62a17ae | 1295 | */ |
1296 | case BGP_ATTR_ORIGIN: | |
1297 | case BGP_ATTR_AS_PATH: | |
1298 | case BGP_ATTR_NEXT_HOP: | |
1299 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1300 | case BGP_ATTR_LOCAL_PREF: | |
1301 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1302 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1303 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1304 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1305 | case BGP_ATTR_ORIGINATOR_ID: |
1306 | case BGP_ATTR_CLUSTER_LIST: | |
4ba5a9c5 | 1307 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1308 | case BGP_ATTR_MP_REACH_NLRI: |
1309 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1310 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1311 | notify_datap, length); | |
1312 | return BGP_ATTR_PARSE_ERROR; | |
1313 | } | |
1314 | ||
1315 | /* Partial optional attributes that are malformed should not cause | |
1316 | * the whole session to be reset. Instead treat it as a withdrawal | |
1317 | * of the routes, if possible. | |
1318 | */ | |
1319 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1320 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1321 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1322 | return BGP_ATTR_PARSE_WITHDRAW; | |
1323 | ||
1324 | /* default to reset */ | |
1325 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1326 | } |
1327 | ||
afcb7679 DO |
1328 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1329 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1330 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1331 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1332 | non-transitive" attribute. */ | |
1333 | static void | |
d62a17ae | 1334 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1335 | uint8_t desired_flags /* how RFC says it must be */ |
1336 | ) | |
d62a17ae | 1337 | { |
d7c0a89a QY |
1338 | uint8_t seen = 0, i; |
1339 | uint8_t real_flags = args->flags; | |
1340 | const uint8_t attr_code = args->type; | |
d62a17ae | 1341 | |
1342 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1343 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1344 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1345 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1346 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1347 | flog_err(EC_BGP_ATTR_FLAG, |
1348 | "%s attribute must%s be flagged as \"%s\"", | |
1349 | lookup_msg(attr_str, attr_code, NULL), | |
1350 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1351 | ? "" | |
1352 | : " not", | |
1353 | attr_flag_str[i].str); | |
d62a17ae | 1354 | seen = 1; |
1355 | } | |
1356 | if (!seen) { | |
1357 | zlog_debug( | |
3efd0893 | 1358 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1359 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1360 | real_flags, desired_flags); | |
1361 | } | |
afcb7679 DO |
1362 | } |
1363 | ||
3ecab4c8 PJ |
1364 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1365 | * as will PARTIAL for optional+transitive attributes. | |
1366 | */ | |
d7c0a89a QY |
1367 | const uint8_t attr_flags_values[] = { |
1368 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1369 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1370 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1371 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1372 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1373 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1374 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1375 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1376 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1377 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1378 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1379 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1380 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1381 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1382 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1383 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1384 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1385 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1386 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1387 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1388 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
9a659715 PG |
1389 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1390 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1391 | }; |
099111ef | 1392 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1393 | |
3dc339cd | 1394 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1395 | { |
d7c0a89a QY |
1396 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1397 | const uint8_t flags = args->flags; | |
1398 | const uint8_t attr_code = args->type; | |
d62a17ae | 1399 | |
1400 | /* there may be attributes we don't know about */ | |
1401 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1402 | return false; |
d62a17ae | 1403 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1404 | return false; |
d62a17ae | 1405 | |
1406 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1407 | * to | |
1408 | * 1." | |
1409 | */ | |
1410 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1411 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1412 | flog_err( |
e50f7cfd | 1413 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1414 | "%s well-known attributes must have transitive flag set (%x)", |
1415 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1416 | return true; |
d62a17ae | 1417 | } |
1418 | ||
1419 | /* "For well-known attributes and for optional non-transitive | |
1420 | * attributes, | |
1421 | * the Partial bit MUST be set to 0." | |
1422 | */ | |
1423 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1424 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1425 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1426 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1427 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1428 | return true; |
d62a17ae | 1429 | } |
1430 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1431 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1432 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1433 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1434 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1435 | return true; |
d62a17ae | 1436 | } |
1437 | } | |
1438 | ||
1439 | /* Optional transitive attributes may go through speakers that don't | |
1440 | * reocgnise them and set the Partial bit. | |
1441 | */ | |
1442 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1443 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1444 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1445 | ||
1446 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1447 | return false; |
d62a17ae | 1448 | |
1449 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1450 | return true; |
3ecab4c8 PJ |
1451 | } |
1452 | ||
718e3744 | 1453 | /* Get origin attribute of the update message. */ |
d62a17ae | 1454 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1455 | { | |
1456 | struct peer *const peer = args->peer; | |
1457 | struct attr *const attr = args->attr; | |
1458 | const bgp_size_t length = args->length; | |
1459 | ||
1460 | /* If any recognized attribute has Attribute Length that conflicts | |
1461 | with the expected length (based on the attribute type code), then | |
1462 | the Error Subcode is set to Attribute Length Error. The Data | |
1463 | field contains the erroneous attribute (type, length and | |
1464 | value). */ | |
1465 | if (length != 1) { | |
e50f7cfd | 1466 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1467 | "Origin attribute length is not one %d", length); |
d62a17ae | 1468 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1469 | args->total); | |
1470 | } | |
1471 | ||
1472 | /* Fetch origin attribute. */ | |
1473 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1474 | ||
1475 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1476 | Subcode is set to Invalid Origin Attribute. The Data field | |
1477 | contains the unrecognized attribute (type, length and value). */ | |
1478 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1479 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1480 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1481 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1482 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1483 | args->total); | |
1484 | } | |
1485 | ||
1486 | /* Set oring attribute flag. */ | |
1487 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1488 | ||
1489 | return 0; | |
718e3744 | 1490 | } |
ab005298 PJ |
1491 | |
1492 | /* Parse AS path information. This function is wrapper of | |
1493 | aspath_parse. */ | |
d62a17ae | 1494 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1495 | { | |
1496 | struct attr *const attr = args->attr; | |
1497 | struct peer *const peer = args->peer; | |
1498 | const bgp_size_t length = args->length; | |
1499 | ||
1500 | /* | |
1501 | * peer with AS4 => will get 4Byte ASnums | |
1502 | * otherwise, will get 16 Bit | |
1503 | */ | |
8cff42ad DA |
1504 | attr->aspath = aspath_parse( |
1505 | peer->curr, length, | |
1506 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) | |
1507 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)); | |
d62a17ae | 1508 | |
1509 | /* In case of IBGP, length will be zero. */ | |
1510 | if (!attr->aspath) { | |
e50f7cfd | 1511 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1512 | "Malformed AS path from %s, length is %d", peer->host, |
1513 | length); | |
d62a17ae | 1514 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1515 | 0); | |
1516 | } | |
0b2aa3a0 | 1517 | |
d62a17ae | 1518 | /* Set aspath attribute flag. */ |
1519 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1520 | ||
1521 | return BGP_ATTR_PARSE_PROCEED; | |
1522 | } | |
1523 | ||
1524 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1525 | struct attr *const attr) | |
1526 | { | |
1527 | /* These checks were part of bgp_attr_aspath, but with | |
1528 | * as4 we should to check aspath things when | |
1529 | * aspath synthesizing with as4_path has already taken place. | |
1530 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1531 | * not right. | |
1532 | * So do the checks later, i.e. here | |
1533 | */ | |
d62a17ae | 1534 | struct aspath *aspath; |
1535 | ||
1536 | /* Confederation sanity check. */ | |
1537 | if ((peer->sort == BGP_PEER_CONFED | |
1538 | && !aspath_left_confed_check(attr->aspath)) | |
1539 | || (peer->sort == BGP_PEER_EBGP | |
1540 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1541 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1542 | peer->host); |
4ba5a9c5 | 1543 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1544 | } |
cddb8112 | 1545 | |
d62a17ae | 1546 | /* First AS check for EBGP. */ |
47cbc09b | 1547 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1548 | if (peer->sort == BGP_PEER_EBGP |
1549 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1550 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1551 | "%s incorrect first AS (must be %u)", |
1552 | peer->host, peer->as); | |
4ba5a9c5 | 1553 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1554 | } |
1555 | } | |
0b2aa3a0 | 1556 | |
88cc0ce4 DA |
1557 | /* Codification of AS 0 Processing */ |
1558 | if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) { | |
1559 | flog_err( | |
1560 | EC_BGP_ATTR_MAL_AS_PATH, | |
1561 | "Malformed AS path, AS number is 0 in the path from %s", | |
1562 | peer->host); | |
1563 | return BGP_ATTR_PARSE_WITHDRAW; | |
1564 | } | |
1565 | ||
d62a17ae | 1566 | /* local-as prepend */ |
1567 | if (peer->change_local_as | |
1568 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1569 | aspath = aspath_dup(attr->aspath); | |
1570 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1571 | aspath_unintern(&attr->aspath); | |
1572 | attr->aspath = aspath_intern(aspath); | |
1573 | } | |
0b2aa3a0 | 1574 | |
d62a17ae | 1575 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1576 | } |
1577 | ||
ab005298 PJ |
1578 | /* Parse AS4 path information. This function is another wrapper of |
1579 | aspath_parse. */ | |
d62a17ae | 1580 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1581 | struct aspath **as4_path) | |
ab005298 | 1582 | { |
d62a17ae | 1583 | struct peer *const peer = args->peer; |
1584 | struct attr *const attr = args->attr; | |
1585 | const bgp_size_t length = args->length; | |
ab005298 | 1586 | |
424ab01d | 1587 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1588 | |
d62a17ae | 1589 | /* In case of IBGP, length will be zero. */ |
1590 | if (!*as4_path) { | |
e50f7cfd | 1591 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1592 | "Malformed AS4 path from %s, length is %d", peer->host, |
1593 | length); | |
d62a17ae | 1594 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1595 | 0); | |
1596 | } | |
ab005298 | 1597 | |
d62a17ae | 1598 | /* Set aspath attribute flag. */ |
1599 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1600 | ||
1601 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1602 | } |
1603 | ||
9738e9aa | 1604 | /* |
1605 | * Check that the nexthop attribute is valid. | |
1606 | */ | |
1607 | bgp_attr_parse_ret_t | |
1608 | bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr) | |
1609 | { | |
1610 | in_addr_t nexthop_h; | |
1611 | ||
1612 | nexthop_h = ntohl(attr->nexthop.s_addr); | |
1613 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1614 | || IPV4_CLASS_DE(nexthop_h)) | |
1615 | && !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) { | |
7decb30c | 1616 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1617 | char buf[INET_ADDRSTRLEN]; |
1618 | ||
1619 | inet_ntop(AF_INET, &attr->nexthop.s_addr, buf, | |
1620 | INET_ADDRSTRLEN); | |
1621 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", | |
1622 | buf); | |
7decb30c DS |
1623 | data[0] = BGP_ATTR_FLAG_TRANS; |
1624 | data[1] = BGP_ATTR_NEXT_HOP; | |
1625 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1626 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1627 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1628 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1629 | data, 7); | |
9738e9aa | 1630 | return BGP_ATTR_PARSE_ERROR; |
1631 | } | |
1632 | ||
1633 | return BGP_ATTR_PARSE_PROCEED; | |
1634 | } | |
1635 | ||
718e3744 | 1636 | /* Nexthop attribute. */ |
d62a17ae | 1637 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1638 | { | |
1639 | struct peer *const peer = args->peer; | |
1640 | struct attr *const attr = args->attr; | |
1641 | const bgp_size_t length = args->length; | |
1642 | ||
d62a17ae | 1643 | /* Check nexthop attribute length. */ |
1644 | if (length != 4) { | |
e50f7cfd | 1645 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1646 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1647 | |
1648 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1649 | args->total); | |
1650 | } | |
1651 | ||
88f33d66 | 1652 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1653 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1654 | ||
1655 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1656 | } |
1657 | ||
1658 | /* MED atrribute. */ | |
d62a17ae | 1659 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1660 | { |
d62a17ae | 1661 | struct peer *const peer = args->peer; |
1662 | struct attr *const attr = args->attr; | |
1663 | const bgp_size_t length = args->length; | |
b881c707 | 1664 | |
d62a17ae | 1665 | /* Length check. */ |
1666 | if (length != 4) { | |
e50f7cfd | 1667 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1668 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1669 | |
d62a17ae | 1670 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1671 | args->total); | |
1672 | } | |
1673 | ||
424ab01d | 1674 | attr->med = stream_getl(peer->curr); |
718e3744 | 1675 | |
d62a17ae | 1676 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1677 | |
d62a17ae | 1678 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1679 | } |
1680 | ||
1681 | /* Local preference attribute. */ | |
b881c707 | 1682 | static bgp_attr_parse_ret_t |
d62a17ae | 1683 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1684 | { | |
1685 | struct peer *const peer = args->peer; | |
1686 | struct attr *const attr = args->attr; | |
1687 | const bgp_size_t length = args->length; | |
1688 | ||
4ba5a9c5 DA |
1689 | /* if received from an internal neighbor, it SHALL be considered |
1690 | * malformed if its length is not equal to 4. If malformed, the | |
1691 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1692 | * withdraw". | |
1693 | */ | |
1694 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1695 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1696 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1697 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1698 | args->total); | |
1699 | } | |
1700 | ||
1701 | /* If it is contained in an UPDATE message that is received from an | |
1702 | external peer, then this attribute MUST be ignored by the | |
1703 | receiving speaker. */ | |
1704 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1705 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1706 | return BGP_ATTR_PARSE_PROCEED; |
1707 | } | |
1708 | ||
ad61f778 | 1709 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1710 | |
7f323236 | 1711 | /* Set the local-pref flag. */ |
d62a17ae | 1712 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1713 | ||
1714 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1715 | |
1716 | stream_failure: | |
1717 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1718 | args->total); | |
718e3744 | 1719 | } |
1720 | ||
1721 | /* Atomic aggregate. */ | |
d62a17ae | 1722 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1723 | { |
d62a17ae | 1724 | struct attr *const attr = args->attr; |
1725 | const bgp_size_t length = args->length; | |
1726 | ||
1727 | /* Length check. */ | |
1728 | if (length != 0) { | |
e50f7cfd | 1729 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1730 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1731 | length); | |
d62a17ae | 1732 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1733 | args->total); | |
1734 | } | |
718e3744 | 1735 | |
d62a17ae | 1736 | /* Set atomic aggregate flag. */ |
1737 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1738 | |
d62a17ae | 1739 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1740 | } |
1741 | ||
1742 | /* Aggregator attribute */ | |
d62a17ae | 1743 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1744 | { | |
1745 | struct peer *const peer = args->peer; | |
1746 | struct attr *const attr = args->attr; | |
1747 | const bgp_size_t length = args->length; | |
33d022bc | 1748 | as_t aggregator_as; |
d62a17ae | 1749 | |
1750 | int wantedlen = 6; | |
1751 | ||
1752 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1753 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1754 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1755 | wantedlen = 8; |
1756 | ||
1757 | if (length != wantedlen) { | |
e50f7cfd | 1758 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1759 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1760 | length); | |
d62a17ae | 1761 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1762 | args->total); | |
1763 | } | |
1764 | ||
1765 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
33d022bc | 1766 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1767 | else |
33d022bc DA |
1768 | aggregator_as = stream_getw(peer->curr); |
1769 | ||
e8364238 DA |
1770 | attr->aggregator_as = aggregator_as; |
1771 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1772 | ||
33d022bc | 1773 | /* Codification of AS 0 Processing */ |
4877b70b | 1774 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1775 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1776 | "%s: AGGREGATOR AS number is 0 for aspath: %s", |
1777 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1778 | |
1779 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1780 | char attr_str[BUFSIZ] = {0}; | |
1781 | ||
1782 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1783 | ||
1784 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1785 | } | |
1786 | } else { | |
8085c9a7 | 1787 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); |
4877b70b | 1788 | } |
33d022bc | 1789 | |
d62a17ae | 1790 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1791 | } |
1792 | ||
0b2aa3a0 | 1793 | /* New Aggregator attribute */ |
b881c707 | 1794 | static bgp_attr_parse_ret_t |
d62a17ae | 1795 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1796 | as_t *as4_aggregator_as, | |
1797 | struct in_addr *as4_aggregator_addr) | |
1798 | { | |
1799 | struct peer *const peer = args->peer; | |
1800 | struct attr *const attr = args->attr; | |
1801 | const bgp_size_t length = args->length; | |
33d022bc | 1802 | as_t aggregator_as; |
d62a17ae | 1803 | |
1804 | if (length != 8) { | |
1c50c1c0 QY |
1805 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1806 | length); | |
d62a17ae | 1807 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1808 | 0); | |
1809 | } | |
1810 | ||
33d022bc | 1811 | aggregator_as = stream_getl(peer->curr); |
0f2a703d | 1812 | |
e8364238 DA |
1813 | *as4_aggregator_as = aggregator_as; |
1814 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1815 | ||
0f2a703d | 1816 | /* Codification of AS 0 Processing */ |
4877b70b | 1817 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1818 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1819 | "%s: AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1820 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1821 | |
1822 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1823 | char attr_str[BUFSIZ] = {0}; | |
1824 | ||
1825 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1826 | ||
1827 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1828 | } | |
1829 | } else { | |
8085c9a7 | 1830 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); |
4877b70b | 1831 | } |
33d022bc | 1832 | |
d62a17ae | 1833 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1834 | } |
1835 | ||
1836 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1837 | */ | |
b881c707 | 1838 | static bgp_attr_parse_ret_t |
d62a17ae | 1839 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1840 | struct aspath *as4_path, as_t as4_aggregator, | |
1841 | struct in_addr *as4_aggregator_addr) | |
1842 | { | |
1843 | int ignore_as4_path = 0; | |
1844 | struct aspath *newpath; | |
1845 | ||
1846 | if (!attr->aspath) { | |
1847 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1848 | * have | |
1849 | * checked that all well-known, mandatory attributes were | |
1850 | * present. | |
1851 | * | |
1852 | * Can only be a problem with peer itself - hard error | |
1853 | */ | |
1854 | return BGP_ATTR_PARSE_ERROR; | |
1855 | } | |
1856 | ||
1857 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1858 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1859 | * if given. | |
1860 | * It is worth a warning though, because the peer really | |
1861 | * should not send them | |
1862 | */ | |
1863 | if (BGP_DEBUG(as4, AS4)) { | |
1864 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1865 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1866 | "AS4 capable peer, yet it sent"); | |
1867 | ||
1868 | if (attr->flag | |
1869 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1870 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1871 | peer->host, | |
1872 | "AS4 capable peer, yet it sent"); | |
1873 | } | |
1874 | ||
1875 | return BGP_ATTR_PARSE_PROCEED; | |
1876 | } | |
1877 | ||
1878 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1879 | * because that may override AS4_PATH | |
1880 | */ | |
1881 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1882 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1883 | /* received both. | |
1884 | * if the as_number in aggregator is not AS_TRANS, | |
1885 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1886 | * and the Aggregator shall be taken as | |
1887 | * info on the aggregating node, and the AS_PATH | |
1888 | * shall be taken as the AS_PATH | |
1889 | * otherwise | |
1890 | * the Aggregator shall be ignored and the | |
1891 | * AS4_AGGREGATOR shall be taken as the | |
1892 | * Aggregating node and the AS_PATH is to be | |
1893 | * constructed "as in all other cases" | |
1894 | */ | |
1895 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1896 | /* ignore */ | |
1897 | if (BGP_DEBUG(as4, AS4)) | |
1898 | zlog_debug( | |
3efd0893 | 1899 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 1900 | peer->host); |
1901 | ignore_as4_path = 1; | |
1902 | } else { | |
1903 | /* "New_aggregator shall be taken as aggregator" | |
1904 | */ | |
1905 | attr->aggregator_as = as4_aggregator; | |
1906 | attr->aggregator_addr.s_addr = | |
1907 | as4_aggregator_addr->s_addr; | |
1908 | } | |
1909 | } else { | |
1910 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1911 | * That is bogus - but reading the conditions | |
1912 | * we have to handle AS4_AGGREGATOR as if it were | |
1913 | * AGGREGATOR in that case | |
1914 | */ | |
1915 | if (BGP_DEBUG(as4, AS4)) | |
1916 | zlog_debug( | |
3efd0893 | 1917 | "[AS4] %s BGP not AS4 capable peer send AS4_AGGREGATOR but no AGGREGATOR, will take it as if AGGREGATOR with AS_TRANS had been there", |
d62a17ae | 1918 | peer->host); |
1919 | attr->aggregator_as = as4_aggregator; | |
1920 | /* sweep it under the carpet and simulate a "good" | |
1921 | * AGGREGATOR */ | |
1922 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1927 | if (!ignore_as4_path | |
1928 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1929 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1930 | if (!newpath) |
1931 | return BGP_ATTR_PARSE_ERROR; | |
1932 | ||
d62a17ae | 1933 | aspath_unintern(&attr->aspath); |
1934 | attr->aspath = aspath_intern(newpath); | |
1935 | } | |
1936 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1937 | } |
1938 | ||
718e3744 | 1939 | /* Community attribute. */ |
b881c707 | 1940 | static bgp_attr_parse_ret_t |
d62a17ae | 1941 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1942 | { | |
1943 | struct peer *const peer = args->peer; | |
1944 | struct attr *const attr = args->attr; | |
1945 | const bgp_size_t length = args->length; | |
1946 | ||
1947 | if (length == 0) { | |
1948 | attr->community = NULL; | |
6680b550 DA |
1949 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
1950 | args->total); | |
d62a17ae | 1951 | } |
1952 | ||
1953 | attr->community = | |
d7c0a89a | 1954 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1955 | |
1956 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1957 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1958 | |
4ba5a9c5 DA |
1959 | /* The Community attribute SHALL be considered malformed if its |
1960 | * length is not a non-zero multiple of 4. | |
1961 | */ | |
d62a17ae | 1962 | if (!attr->community) |
1963 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1964 | args->total); | |
1965 | ||
1966 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1967 | ||
1968 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1969 | } |
1970 | ||
1971 | /* Originator ID attribute. */ | |
b881c707 | 1972 | static bgp_attr_parse_ret_t |
d62a17ae | 1973 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1974 | { |
d62a17ae | 1975 | struct peer *const peer = args->peer; |
1976 | struct attr *const attr = args->attr; | |
1977 | const bgp_size_t length = args->length; | |
718e3744 | 1978 | |
4ba5a9c5 DA |
1979 | /* if received from an internal neighbor, it SHALL be considered |
1980 | * malformed if its length is not equal to 4. If malformed, the | |
1981 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1982 | * withdraw". | |
1983 | */ | |
d62a17ae | 1984 | if (length != 4) { |
e50f7cfd | 1985 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 1986 | length); |
718e3744 | 1987 | |
d62a17ae | 1988 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1989 | args->total); | |
1990 | } | |
1991 | ||
424ab01d | 1992 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 1993 | |
d62a17ae | 1994 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 1995 | |
d62a17ae | 1996 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1997 | } |
1998 | ||
1999 | /* Cluster list attribute. */ | |
b881c707 | 2000 | static bgp_attr_parse_ret_t |
d62a17ae | 2001 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 2002 | { |
d62a17ae | 2003 | struct peer *const peer = args->peer; |
2004 | struct attr *const attr = args->attr; | |
2005 | const bgp_size_t length = args->length; | |
2006 | ||
4ba5a9c5 DA |
2007 | /* if received from an internal neighbor, it SHALL be considered |
2008 | * malformed if its length is not a non-zero multiple of 4. If | |
2009 | * malformed, the UPDATE message SHALL be handled using the approach | |
2010 | * of "treat-as-withdraw". | |
2011 | */ | |
33ba22c2 | 2012 | if (length == 0 || length % 4) { |
1c50c1c0 | 2013 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 2014 | |
d62a17ae | 2015 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2016 | args->total); | |
2017 | } | |
2018 | ||
779fee93 DS |
2019 | bgp_attr_set_cluster( |
2020 | attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr), | |
2021 | length)); | |
718e3744 | 2022 | |
d62a17ae | 2023 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 2024 | stream_forward_getp(peer->curr, length); |
718e3744 | 2025 | |
d62a17ae | 2026 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 2027 | |
d62a17ae | 2028 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2029 | } |
2030 | ||
2031 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 2032 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
2033 | struct bgp_nlri *mp_update) | |
2034 | { | |
2035 | iana_afi_t pkt_afi; | |
2036 | afi_t afi; | |
5c525538 RW |
2037 | iana_safi_t pkt_safi; |
2038 | safi_t safi; | |
d62a17ae | 2039 | bgp_size_t nlri_len; |
2040 | size_t start; | |
2041 | struct stream *s; | |
2042 | struct peer *const peer = args->peer; | |
2043 | struct attr *const attr = args->attr; | |
2044 | const bgp_size_t length = args->length; | |
2045 | ||
2046 | /* Set end of packet. */ | |
2047 | s = BGP_INPUT(peer); | |
2048 | start = stream_get_getp(s); | |
2049 | ||
2050 | /* safe to read statically sized header? */ | |
6e4ab12f | 2051 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 2052 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 2053 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
2054 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
2055 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 2056 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2057 | } | |
2058 | ||
2059 | /* Load AFI, SAFI. */ | |
2060 | pkt_afi = stream_getw(s); | |
2061 | pkt_safi = stream_getc(s); | |
2062 | ||
2063 | /* Convert AFI, SAFI to internal values, check. */ | |
2064 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2065 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2066 | * unless | |
2067 | * the attribute is otherwise malformed. | |
2068 | */ | |
2069 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2070 | zlog_debug( | |
4cb5e18b | 2071 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
2072 | peer->host, iana_afi2str(pkt_afi), |
2073 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2074 | return BGP_ATTR_PARSE_ERROR; |
2075 | } | |
2076 | ||
2077 | /* Get nexthop length. */ | |
2078 | attr->mp_nexthop_len = stream_getc(s); | |
2079 | ||
2080 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
2081 | zlog_info( | |
4cb5e18b | 2082 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 2083 | __func__, peer->host, attr->mp_nexthop_len); |
2084 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2085 | } | |
2086 | ||
2087 | /* Nexthop length check. */ | |
2088 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2089 | case 0: |
2090 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2091 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2092 | __func__, peer->host, attr->mp_nexthop_len); |
2093 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2094 | } | |
2095 | break; | |
b6453163 LB |
2096 | case BGP_ATTR_NHLEN_VPNV4: |
2097 | stream_getl(s); /* RD high */ | |
2098 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2099 | /* |
2100 | * NOTE: intentional fall through | |
2101 | * - for consistency in rx processing | |
2102 | * | |
2103 | * The following comment is to signal GCC this intention | |
0437e105 | 2104 | * and suppress the warning |
996c9314 LB |
2105 | */ |
2106 | /* FALLTHRU */ | |
d62a17ae | 2107 | case BGP_ATTR_NHLEN_IPV4: |
2108 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2109 | /* Probably needed for RFC 2283 */ | |
975a328e | 2110 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2111 | memcpy(&attr->nexthop.s_addr, |
2112 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2113 | break; | |
d62a17ae | 2114 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2115 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2116 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2117 | stream_getl(s); /* RD high */ | |
2118 | stream_getl(s); /* RD low */ | |
2119 | } | |
2120 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2121 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2122 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2123 | zlog_warn("%s sent a v6 global attribute but address is a V6 LL and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2124 | peer->host); |
2125 | return BGP_ATTR_PARSE_WITHDRAW; | |
2126 | } | |
77e62f2b | 2127 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2128 | } |
d62a17ae | 2129 | break; |
2130 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2131 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2132 | if (attr->mp_nexthop_len | |
2133 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2134 | stream_getl(s); /* RD high */ | |
2135 | stream_getl(s); /* RD low */ | |
2136 | } | |
2137 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2138 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2139 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2140 | zlog_warn("%s sent a v6 global and LL attribute but global address is a V6 LL and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2141 | peer->host); |
2142 | return BGP_ATTR_PARSE_WITHDRAW; | |
2143 | } | |
77e62f2b | 2144 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2145 | } |
d62a17ae | 2146 | if (attr->mp_nexthop_len |
2147 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2148 | stream_getl(s); /* RD high */ | |
2149 | stream_getl(s); /* RD low */ | |
2150 | } | |
2151 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2152 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
d62a17ae | 2153 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2154 | zlog_debug( | |
c0d72166 DS |
2155 | "%s sent next-hops %pI6 and %pI6. Ignoring non-LL value", |
2156 | peer->host, &attr->mp_nexthop_global, | |
2157 | &attr->mp_nexthop_local); | |
d62a17ae | 2158 | |
2159 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2160 | } | |
17cdd31e | 2161 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2162 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2163 | peer->host); |
2164 | return BGP_ATTR_PARSE_WITHDRAW; | |
2165 | } | |
77e62f2b | 2166 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2167 | break; |
2168 | default: | |
4cb5e18b | 2169 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2170 | __func__, peer->host, attr->mp_nexthop_len); |
2171 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2172 | } | |
2173 | ||
2174 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2175 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2176 | __func__, peer->host); | |
d62a17ae | 2177 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2178 | } | |
2179 | ||
718e3744 | 2180 | { |
d7c0a89a | 2181 | uint8_t val; |
d62a17ae | 2182 | if ((val = stream_getc(s))) |
ade6974d | 2183 | flog_warn( |
e50f7cfd | 2184 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2185 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2186 | peer->host, val); | |
d62a17ae | 2187 | } |
2188 | ||
2189 | /* must have nrli_len, what is left of the attribute */ | |
2190 | nlri_len = LEN_LEFT; | |
9b9df989 | 2191 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2192 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2193 | __func__, peer->host); | |
d62a17ae | 2194 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2195 | } | |
2196 | ||
9b9df989 | 2197 | if (!nlri_len) { |
4cb5e18b | 2198 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2199 | __func__, peer->host); |
2200 | ||
2201 | mp_update->afi = afi; | |
2202 | mp_update->safi = safi; | |
2203 | return BGP_ATTR_PARSE_EOR; | |
2204 | } | |
2205 | ||
d62a17ae | 2206 | mp_update->afi = afi; |
2207 | mp_update->safi = safi; | |
2208 | mp_update->nlri = stream_pnt(s); | |
2209 | mp_update->length = nlri_len; | |
2210 | ||
2211 | stream_forward_getp(s, nlri_len); | |
2212 | ||
2213 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2214 | ||
2215 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2216 | #undef LEN_LEFT |
718e3744 | 2217 | } |
2218 | ||
2219 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2220 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2221 | struct bgp_nlri *mp_withdraw) | |
2222 | { | |
2223 | struct stream *s; | |
2224 | iana_afi_t pkt_afi; | |
2225 | afi_t afi; | |
5c525538 RW |
2226 | iana_safi_t pkt_safi; |
2227 | safi_t safi; | |
d7c0a89a | 2228 | uint16_t withdraw_len; |
d62a17ae | 2229 | struct peer *const peer = args->peer; |
2230 | struct attr *const attr = args->attr; | |
2231 | const bgp_size_t length = args->length; | |
9cabb64b | 2232 | |
424ab01d | 2233 | s = peer->curr; |
9cabb64b | 2234 | |
d62a17ae | 2235 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2236 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2237 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2238 | ||
2239 | pkt_afi = stream_getw(s); | |
2240 | pkt_safi = stream_getc(s); | |
2241 | ||
2242 | /* Convert AFI, SAFI to internal values, check. */ | |
2243 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2244 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2245 | * unless | |
2246 | * the attribute is otherwise malformed. | |
2247 | */ | |
2248 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2249 | zlog_debug( | |
748a041f DS |
2250 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2251 | peer->host, iana_afi2str(pkt_afi), | |
2252 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2253 | return BGP_ATTR_PARSE_ERROR; |
2254 | } | |
718e3744 | 2255 | |
d62a17ae | 2256 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2257 | |
d62a17ae | 2258 | mp_withdraw->afi = afi; |
2259 | mp_withdraw->safi = safi; | |
2260 | mp_withdraw->nlri = stream_pnt(s); | |
2261 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2262 | |
d62a17ae | 2263 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2264 | |
d62a17ae | 2265 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2266 | ||
2267 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2268 | } |
2269 | ||
57d187bc JS |
2270 | /* Large Community attribute. */ |
2271 | static bgp_attr_parse_ret_t | |
d62a17ae | 2272 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2273 | { | |
2274 | struct peer *const peer = args->peer; | |
2275 | struct attr *const attr = args->attr; | |
2276 | const bgp_size_t length = args->length; | |
2277 | ||
2278 | /* | |
2279 | * Large community follows new attribute format. | |
2280 | */ | |
2281 | if (length == 0) { | |
2282 | attr->lcommunity = NULL; | |
2283 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2284 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2285 | args->total); | |
d62a17ae | 2286 | } |
57d187bc | 2287 | |
c4efd0f4 | 2288 | attr->lcommunity = lcommunity_parse(stream_pnt(peer->curr), length); |
d62a17ae | 2289 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2290 | stream_forward_getp(peer->curr, length); |
57d187bc | 2291 | |
d62a17ae | 2292 | if (!attr->lcommunity) |
2293 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2294 | args->total); | |
57d187bc | 2295 | |
d62a17ae | 2296 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 2297 | |
d62a17ae | 2298 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
2299 | } |
2300 | ||
718e3744 | 2301 | /* Extended Community attribute. */ |
b881c707 | 2302 | static bgp_attr_parse_ret_t |
d62a17ae | 2303 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2304 | { | |
2305 | struct peer *const peer = args->peer; | |
2306 | struct attr *const attr = args->attr; | |
2307 | const bgp_size_t length = args->length; | |
d7c0a89a | 2308 | uint8_t sticky = 0; |
7904e9fd | 2309 | bool proxy = false; |
d62a17ae | 2310 | |
2311 | if (length == 0) { | |
2312 | attr->ecommunity = NULL; | |
2313 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2314 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2315 | args->total); | |
d62a17ae | 2316 | } |
2317 | ||
27aa23a4 DA |
2318 | attr->ecommunity = ecommunity_parse( |
2319 | stream_pnt(peer->curr), length, | |
2320 | CHECK_FLAG(peer->flags, | |
2321 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d62a17ae | 2322 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2323 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2324 | |
4ba5a9c5 DA |
2325 | /* The Extended Community attribute SHALL be considered malformed if |
2326 | * its length is not a non-zero multiple of 8. | |
2327 | */ | |
d62a17ae | 2328 | if (!attr->ecommunity) |
2329 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2330 | args->total); | |
2331 | ||
2332 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
2333 | ||
74e2bd89 AK |
2334 | /* Extract DF election preference and mobility sequence number */ |
2335 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2336 | ||
d62a17ae | 2337 | /* Extract MAC mobility sequence number, if any. */ |
2338 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2339 | attr->sticky = sticky; | |
2340 | ||
ead40654 MK |
2341 | /* Check if this is a Gateway MAC-IP advertisement */ |
2342 | attr->default_gw = bgp_attr_default_gw(attr); | |
2343 | ||
68e33151 CS |
2344 | /* Handle scenario where router flag ecommunity is not |
2345 | * set but default gw ext community is present. | |
2346 | * Use default gateway, set and propogate R-bit. | |
2347 | */ | |
2348 | if (attr->default_gw) | |
2349 | attr->router_flag = 1; | |
2350 | ||
2351 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2352 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2353 | if (proxy) | |
2354 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2355 | |
bc59a672 | 2356 | /* Extract the Rmac, if any */ |
eee353c5 | 2357 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
c0d72166 DS |
2358 | if (bgp_debug_update(peer, NULL, NULL, 1) |
2359 | && bgp_mac_exist(&attr->rmac)) | |
2360 | zlog_debug("%s: router mac %pEA is self mac", __func__, | |
2361 | &attr->rmac); | |
eee353c5 | 2362 | } |
bc59a672 | 2363 | |
f4bd90c5 LK |
2364 | /* Get the tunnel type from encap extended community */ |
2365 | bgp_attr_extcom_tunnel_type(attr, | |
2366 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2367 | ||
d901dc13 | 2368 | /* Extract link bandwidth, if any. */ |
2369 | (void)ecommunity_linkbw_present(attr->ecommunity, &attr->link_bw); | |
2370 | ||
d62a17ae | 2371 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2372 | } |
2373 | ||
9a659715 PG |
2374 | /* IPv6 Extended Community attribute. */ |
2375 | static bgp_attr_parse_ret_t | |
2376 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) | |
2377 | { | |
2378 | struct peer *const peer = args->peer; | |
2379 | struct attr *const attr = args->attr; | |
2380 | const bgp_size_t length = args->length; | |
d04ac434 | 2381 | struct ecommunity *ipv6_ecomm = NULL; |
9a659715 PG |
2382 | |
2383 | if (length == 0) { | |
d04ac434 | 2384 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
c6423c31 PG |
2385 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2386 | args->total); | |
9a659715 PG |
2387 | } |
2388 | ||
27aa23a4 DA |
2389 | ipv6_ecomm = ecommunity_parse_ipv6( |
2390 | stream_pnt(peer->curr), length, | |
2391 | CHECK_FLAG(peer->flags, | |
2392 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d04ac434 DS |
2393 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
2394 | ||
9a659715 PG |
2395 | /* XXX: fix ecommunity_parse to use stream API */ |
2396 | stream_forward_getp(peer->curr, length); | |
2397 | ||
d04ac434 | 2398 | if (!ipv6_ecomm) |
9a659715 PG |
2399 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2400 | args->total); | |
2401 | ||
2402 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES); | |
2403 | ||
2404 | return BGP_ATTR_PARSE_PROCEED; | |
2405 | } | |
2406 | ||
f4c89855 | 2407 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2408 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2409 | bgp_size_t length, /* IN: attr's length field */ | |
2410 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2411 | uint8_t flag, /* IN: attr's flags field */ |
2412 | uint8_t *startp) | |
d62a17ae | 2413 | { |
2414 | bgp_size_t total; | |
d62a17ae | 2415 | uint16_t tunneltype = 0; |
2416 | ||
2417 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2418 | ||
2419 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2420 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2421 | zlog_info( | |
2422 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2423 | flag); | |
2424 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2425 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2426 | startp, total); | |
2427 | return -1; | |
2428 | } | |
2429 | ||
2430 | if (BGP_ATTR_ENCAP == type) { | |
2431 | /* read outer TLV type and length */ | |
2432 | uint16_t tlv_length; | |
2433 | ||
2434 | if (length < 4) { | |
2435 | zlog_info( | |
2436 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2437 | bgp_notify_send_with_data( | |
2438 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2439 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2440 | return -1; | |
2441 | } | |
2442 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2443 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2444 | length -= 4; | |
2445 | ||
2446 | if (tlv_length != length) { | |
4cb5e18b NT |
2447 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2448 | __func__, tlv_length, length); | |
d62a17ae | 2449 | } |
2450 | } | |
2451 | ||
2452 | while (length >= 4) { | |
2453 | uint16_t subtype = 0; | |
2454 | uint16_t sublength = 0; | |
2455 | struct bgp_attr_encap_subtlv *tlv; | |
2456 | ||
2457 | if (BGP_ATTR_ENCAP == type) { | |
2458 | subtype = stream_getc(BGP_INPUT(peer)); | |
2459 | sublength = stream_getc(BGP_INPUT(peer)); | |
2460 | length -= 2; | |
1e20238a | 2461 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2462 | } else { |
2463 | subtype = stream_getw(BGP_INPUT(peer)); | |
2464 | sublength = stream_getw(BGP_INPUT(peer)); | |
2465 | length -= 4; | |
65efcfce | 2466 | #endif |
d62a17ae | 2467 | } |
2468 | ||
2469 | if (sublength > length) { | |
2470 | zlog_info( | |
2471 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2472 | sublength, length); | |
2473 | bgp_notify_send_with_data( | |
2474 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2475 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2476 | return -1; | |
2477 | } | |
2478 | ||
2479 | /* alloc and copy sub-tlv */ | |
2480 | /* TBD make sure these are freed when attributes are released */ | |
2481 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2482 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2483 | tlv->type = subtype; |
2484 | tlv->length = sublength; | |
424ab01d | 2485 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2486 | length -= sublength; |
2487 | ||
2488 | /* attach tlv to encap chain */ | |
2489 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2490 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2491 | for (stlv_last = attr->encap_subtlvs; |
2492 | stlv_last && stlv_last->next; | |
2493 | stlv_last = stlv_last->next) | |
2494 | ; | |
2495 | if (stlv_last) { | |
2496 | stlv_last->next = tlv; | |
2497 | } else { | |
2498 | attr->encap_subtlvs = tlv; | |
2499 | } | |
1e20238a | 2500 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2501 | } else { |
e4002056 | 2502 | struct bgp_attr_encap_subtlv *stlv_last; |
91ebf12c DS |
2503 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
2504 | bgp_attr_get_vnc_subtlvs(attr); | |
2505 | ||
2506 | for (stlv_last = vnc_subtlvs; | |
d62a17ae | 2507 | stlv_last && stlv_last->next; |
2508 | stlv_last = stlv_last->next) | |
2509 | ; | |
91ebf12c | 2510 | if (stlv_last) |
d62a17ae | 2511 | stlv_last->next = tlv; |
91ebf12c DS |
2512 | else |
2513 | bgp_attr_set_vnc_subtlvs(attr, tlv); | |
aadc0905 | 2514 | #endif |
d62a17ae | 2515 | } |
d62a17ae | 2516 | } |
f4c89855 | 2517 | |
d62a17ae | 2518 | if (BGP_ATTR_ENCAP == type) { |
2519 | attr->encap_tunneltype = tunneltype; | |
2520 | } | |
f4c89855 | 2521 | |
d62a17ae | 2522 | if (length) { |
2523 | /* spurious leftover data */ | |
2524 | zlog_info( | |
2525 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2526 | length); | |
2527 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2528 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2529 | startp, total); | |
2530 | return -1; | |
2531 | } | |
f4c89855 | 2532 | |
d62a17ae | 2533 | return 0; |
f4c89855 LB |
2534 | } |
2535 | ||
30adbd4e DS |
2536 | /* |
2537 | * Read an individual SID value returning how much data we have read | |
2538 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2539 | */ |
f69aeb76 | 2540 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(uint8_t type, uint16_t length, |
45a06b11 | 2541 | struct bgp_attr_parser_args *args) |
d62a17ae | 2542 | { |
2543 | struct peer *const peer = args->peer; | |
2544 | struct attr *const attr = args->attr; | |
d7c0a89a | 2545 | uint32_t label_index; |
d62a17ae | 2546 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2547 | uint32_t srgb_base; |
2548 | uint32_t srgb_range; | |
d62a17ae | 2549 | int srgb_count; |
e496b420 HS |
2550 | uint8_t sid_type, sid_flags; |
2551 | uint16_t endpoint_behavior; | |
2552 | char buf[BUFSIZ]; | |
d62a17ae | 2553 | |
d62a17ae | 2554 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2555 | if (STREAM_READABLE(peer->curr) < length |
2556 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2557 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2558 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2559 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2560 | return bgp_attr_malformed(args, |
2561 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2562 | args->total); | |
d62a17ae | 2563 | } |
2564 | ||
2565 | /* Ignore flags and reserved */ | |
424ab01d QY |
2566 | stream_getc(peer->curr); |
2567 | stream_getw(peer->curr); | |
d62a17ae | 2568 | |
2569 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2570 | label_index = stream_getl(peer->curr); |
d62a17ae | 2571 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2572 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2573 | args->total); | |
d62a17ae | 2574 | |
2575 | /* Store label index; subsequently, we'll check on | |
2576 | * address-family */ | |
2577 | attr->label_index = label_index; | |
d62a17ae | 2578 | } |
2579 | ||
2580 | /* Placeholder code for the IPv6 SID type */ | |
2581 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
2582 | if (STREAM_READABLE(peer->curr) < length |
2583 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2584 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2585 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 2586 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
2587 | return bgp_attr_malformed(args, |
2588 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2589 | args->total); | |
d62a17ae | 2590 | } |
2591 | ||
2592 | /* Ignore reserved */ | |
424ab01d QY |
2593 | stream_getc(peer->curr); |
2594 | stream_getw(peer->curr); | |
d62a17ae | 2595 | |
424ab01d | 2596 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2597 | } |
2598 | ||
2599 | /* Placeholder code for the Originator SRGB type */ | |
2600 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
2601 | /* |
2602 | * ietf-idr-bgp-prefix-sid-05: | |
2603 | * Length is the total length of the value portion of the | |
2604 | * TLV: 2 + multiple of 6. | |
2605 | * | |
2606 | * peer->curr stream readp should be at the beginning of the 16 | |
2607 | * bit flag field at this point in the code. | |
2608 | */ | |
d62a17ae | 2609 | |
473046ee QY |
2610 | /* |
2611 | * Check that the TLV length field is sane: at least 2 bytes of | |
2612 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
2613 | */ | |
2614 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
2615 | flog_err( | |
2616 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2617 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
2618 | length, |
2619 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2620 | return bgp_attr_malformed( | |
2621 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2622 | args->total); | |
2623 | } | |
d62a17ae | 2624 | |
473046ee QY |
2625 | /* |
2626 | * Check that we actually have at least as much data as | |
2627 | * specified by the length field | |
2628 | */ | |
2629 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 2630 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2631 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 2632 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
2633 | return bgp_attr_malformed( |
2634 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2635 | args->total); | |
2636 | } | |
2637 | ||
473046ee QY |
2638 | /* |
2639 | * Check that the portion of the TLV containing the sequence of | |
2640 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
2641 | * that length, we skip the 16 bit flags field | |
2642 | */ | |
424ab01d | 2643 | stream_getw(peer->curr); |
d62a17ae | 2644 | length -= 2; |
d62a17ae | 2645 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 2646 | flog_err( |
e50f7cfd | 2647 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2648 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 2649 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
2650 | return bgp_attr_malformed( | |
2651 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2652 | args->total); | |
2653 | } | |
2654 | ||
2655 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2656 | ||
2657 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2658 | stream_get(&srgb_base, peer->curr, 3); |
2659 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2660 | } |
2661 | } | |
2662 | ||
e496b420 HS |
2663 | /* Placeholder code for the VPN-SID Service type */ |
2664 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
2665 | if (STREAM_READABLE(peer->curr) < length | |
2666 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
2667 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2668 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
2669 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
2670 | return bgp_attr_malformed(args, | |
2671 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2672 | args->total); | |
2673 | } | |
2674 | ||
2675 | /* Parse VPN-SID Sub-TLV */ | |
2676 | stream_getc(peer->curr); /* reserved */ | |
2677 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
2678 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2679 | stream_get(&ipv6_sid, peer->curr, | |
2680 | sizeof(ipv6_sid)); /* sid_value */ | |
2681 | ||
2682 | /* Log VPN-SID Sub-TLV */ | |
2683 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2684 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2685 | zlog_debug( | |
2686 | "%s: vpn-sid: sid %s, sid-type 0x%02x sid-flags 0x%02x", | |
2687 | __func__, buf, sid_type, sid_flags); | |
2688 | } | |
2689 | ||
2690 | /* Configure from Info */ | |
b502ca11 QY |
2691 | if (attr->srv6_vpn) { |
2692 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2693 | "Prefix SID SRv6 VPN field repeated"); | |
2694 | return bgp_attr_malformed( | |
2695 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2696 | } | |
340594a9 | 2697 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 2698 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
2699 | attr->srv6_vpn->sid_flags = sid_flags; |
2700 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
b83127e1 | 2701 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); |
e496b420 HS |
2702 | } |
2703 | ||
2704 | /* Placeholder code for the SRv6 L3 Service type */ | |
2705 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
2706 | if (STREAM_READABLE(peer->curr) < length | |
2707 | || length != BGP_PREFIX_SID_SRV6_L3_SERVICE_LENGTH) { | |
2708 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2709 | "Prefix SID SRv6 L3-Service length is %hu instead of %u", |
e496b420 HS |
2710 | length, BGP_PREFIX_SID_SRV6_L3_SERVICE_LENGTH); |
2711 | return bgp_attr_malformed(args, | |
2712 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2713 | args->total); | |
2714 | } | |
2715 | ||
2716 | /* Parse L3-SERVICE Sub-TLV */ | |
2717 | stream_getc(peer->curr); /* reserved */ | |
2718 | stream_get(&ipv6_sid, peer->curr, | |
2719 | sizeof(ipv6_sid)); /* sid_value */ | |
2720 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2721 | endpoint_behavior = stream_getw(peer->curr); /* endpoint */ | |
2722 | stream_getc(peer->curr); /* reserved */ | |
2723 | ||
2724 | /* Log L3-SERVICE Sub-TLV */ | |
2725 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2726 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2727 | zlog_debug( | |
2728 | "%s: srv6-l3-srv sid %s, sid-flags 0x%02x, end-behaviour 0x%04x", | |
2729 | __func__, buf, sid_flags, endpoint_behavior); | |
2730 | } | |
2731 | ||
2732 | /* Configure from Info */ | |
b502ca11 QY |
2733 | if (attr->srv6_l3vpn) { |
2734 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2735 | "Prefix SID SRv6 L3VPN field repeated"); | |
2736 | return bgp_attr_malformed( | |
2737 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2738 | } | |
340594a9 | 2739 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, |
e496b420 HS |
2740 | sizeof(struct bgp_attr_srv6_l3vpn)); |
2741 | attr->srv6_l3vpn->sid_flags = sid_flags; | |
2742 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
2743 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); | |
b83127e1 | 2744 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); |
e496b420 HS |
2745 | } |
2746 | ||
2747 | /* Placeholder code for Unsupported TLV */ | |
2748 | else { | |
f69aeb76 QY |
2749 | |
2750 | if (STREAM_READABLE(peer->curr) < length) { | |
2751 | flog_err( | |
2752 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2753 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
2754 | length, STREAM_READABLE(peer->curr)); |
2755 | return bgp_attr_malformed( | |
2756 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2757 | args->total); | |
2758 | } | |
2759 | ||
c6ca155d HS |
2760 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2761 | zlog_debug( | |
2762 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
2763 | peer->host, type); | |
f69aeb76 QY |
2764 | |
2765 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
2766 | } |
2767 | ||
d62a17ae | 2768 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
2769 | } |
2770 | ||
30adbd4e DS |
2771 | /* Prefix SID attribute |
2772 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2773 | */ | |
45a06b11 | 2774 | bgp_attr_parse_ret_t bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
2775 | { |
2776 | struct peer *const peer = args->peer; | |
2777 | struct attr *const attr = args->attr; | |
2778 | bgp_attr_parse_ret_t ret; | |
2779 | ||
2780 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2781 | ||
f69aeb76 QY |
2782 | uint8_t type; |
2783 | uint16_t length; | |
2784 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 2785 | size_t psid_parsed_length = 0; |
30adbd4e | 2786 | |
38774fc5 HS |
2787 | while (STREAM_READABLE(peer->curr) > 0 |
2788 | && psid_parsed_length < args->length) { | |
30adbd4e | 2789 | |
f69aeb76 QY |
2790 | if (STREAM_READABLE(peer->curr) < headersz) { |
2791 | flog_err( | |
2792 | EC_BGP_ATTR_LEN, | |
2793 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2794 | headersz, STREAM_READABLE(peer->curr)); | |
2795 | return bgp_attr_malformed( | |
2796 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2797 | args->total); | |
2798 | } | |
30adbd4e | 2799 | |
f69aeb76 QY |
2800 | type = stream_getc(peer->curr); |
2801 | length = stream_getw(peer->curr); | |
30adbd4e | 2802 | |
f69aeb76 | 2803 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 2804 | flog_err( |
e50f7cfd | 2805 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2806 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 2807 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
2808 | return bgp_attr_malformed(args, |
2809 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2810 | args->total); | |
2811 | } | |
f69aeb76 | 2812 | |
45a06b11 | 2813 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
2814 | |
2815 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2816 | return ret; | |
38774fc5 HS |
2817 | |
2818 | psid_parsed_length += length + headersz; | |
2819 | ||
2820 | if (psid_parsed_length > args->length) { | |
2821 | flog_err( | |
2822 | EC_BGP_ATTR_LEN, | |
3efd0893 | 2823 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
2824 | length + headersz, psid_parsed_length - (length + headersz)); |
2825 | return bgp_attr_malformed( | |
2826 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2827 | args->total); | |
2828 | } | |
30adbd4e DS |
2829 | } |
2830 | ||
2831 | return BGP_ATTR_PARSE_PROCEED; | |
2832 | } | |
2833 | ||
7fd077aa | 2834 | /* PMSI tunnel attribute (RFC 6514) |
2835 | * Basic validation checks done here. | |
2836 | */ | |
2837 | static bgp_attr_parse_ret_t | |
2838 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2839 | { | |
2840 | struct peer *const peer = args->peer; | |
2841 | struct attr *const attr = args->attr; | |
2842 | const bgp_size_t length = args->length; | |
d7c0a89a | 2843 | uint8_t tnl_type; |
355f3c11 | 2844 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 2845 | |
2846 | /* Verify that the receiver is expecting "ingress replication" as we | |
2847 | * can only support that. | |
2848 | */ | |
355f3c11 | 2849 | if (length < attr_parse_len) { |
1c50c1c0 QY |
2850 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
2851 | length); | |
7fd077aa | 2852 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2853 | args->total); | |
2854 | } | |
2855 | stream_getc(peer->curr); /* Flags */ | |
2856 | tnl_type = stream_getc(peer->curr); | |
2857 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 2858 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 2859 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 2860 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2861 | args->total); | |
2862 | } | |
2863 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
2864 | if (length != 9) { | |
e50f7cfd | 2865 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
2866 | "Bad PMSI tunnel attribute length %d for IR", |
2867 | length); | |
052ea98b | 2868 | return bgp_attr_malformed( |
2869 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2870 | args->total); | |
7fd077aa | 2871 | } |
2872 | } | |
2873 | ||
2874 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2a3f51cf | 2875 | bgp_attr_set_pmsi_tnl_type(attr, tnl_type); |
355f3c11 | 2876 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 2877 | |
2878 | /* Forward read pointer of input stream. */ | |
355f3c11 | 2879 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 2880 | |
2881 | return BGP_ATTR_PARSE_PROCEED; | |
2882 | } | |
2883 | ||
718e3744 | 2884 | /* BGP unknown attribute treatment. */ |
d62a17ae | 2885 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
2886 | { | |
2887 | bgp_size_t total = args->total; | |
2888 | struct transit *transit; | |
2889 | struct peer *const peer = args->peer; | |
2890 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
2891 | uint8_t *const startp = args->startp; |
2892 | const uint8_t type = args->type; | |
2893 | const uint8_t flag = args->flags; | |
d62a17ae | 2894 | const bgp_size_t length = args->length; |
2895 | ||
2896 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2897 | zlog_debug( | |
2898 | "%s Unknown attribute is received (type %d, length %d)", | |
2899 | peer->host, type, length); | |
2900 | ||
2901 | /* Forward read pointer of input stream. */ | |
424ab01d | 2902 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2903 | |
2904 | /* If any of the mandatory well-known attributes are not recognized, | |
2905 | then the Error Subcode is set to Unrecognized Well-known | |
2906 | Attribute. The Data field contains the unrecognized attribute | |
2907 | (type, length and value). */ | |
2908 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2909 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
2910 | args->total); | |
2911 | } | |
2912 | ||
2913 | /* Unrecognized non-transitive optional attributes must be quietly | |
2914 | ignored and not passed along to other BGP peers. */ | |
2915 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
2916 | return BGP_ATTR_PARSE_PROCEED; | |
2917 | ||
2918 | /* If a path with recognized transitive optional attribute is | |
2919 | accepted and passed along to other BGP peers and the Partial bit | |
2920 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
2921 | is not set back to 0 by the current AS. */ | |
2922 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
2923 | ||
2924 | /* Store transitive attribute to the end of attr->transit. */ | |
04fb21e2 DS |
2925 | transit = bgp_attr_get_transit(attr); |
2926 | if (!transit) | |
2927 | transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
d62a17ae | 2928 | |
0b04fa0e DS |
2929 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, |
2930 | transit->length + total); | |
d62a17ae | 2931 | |
2932 | memcpy(transit->val + transit->length, startp, total); | |
2933 | transit->length += total; | |
04fb21e2 | 2934 | bgp_attr_set_transit(attr, transit); |
d62a17ae | 2935 | |
2936 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2937 | } |
2938 | ||
bb7bef14 | 2939 | /* Well-known attribute check. */ |
d62a17ae | 2940 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
2941 | { | |
d7c0a89a | 2942 | uint8_t type = 0; |
d62a17ae | 2943 | |
2944 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
2945 | * empty UPDATE. */ | |
2946 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
2947 | return BGP_ATTR_PARSE_PROCEED; | |
2948 | ||
2949 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
2950 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
2951 | are present, it should. Check for any other attribute being present | |
2952 | instead. | |
2953 | */ | |
404c82d5 PG |
2954 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
2955 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 2956 | return BGP_ATTR_PARSE_PROCEED; |
2957 | ||
2958 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
2959 | type = BGP_ATTR_ORIGIN; | |
2960 | ||
2961 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
2962 | type = BGP_ATTR_AS_PATH; | |
2963 | ||
2964 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
2965 | * and | |
2966 | * NLRI is empty. We can't easily check NLRI empty here though. | |
2967 | */ | |
2968 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
2969 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
2970 | type = BGP_ATTR_NEXT_HOP; | |
2971 | ||
2972 | if (peer->sort == BGP_PEER_IBGP | |
2973 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
2974 | type = BGP_ATTR_LOCAL_PREF; | |
2975 | ||
4ba5a9c5 DA |
2976 | /* If any of the well-known mandatory attributes are not present |
2977 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
2978 | */ | |
d62a17ae | 2979 | if (type) { |
e50f7cfd | 2980 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 2981 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 2982 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 2983 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 2984 | } |
2985 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
2986 | } |
2987 | ||
718e3744 | 2988 | /* Read attribute of update packet. This function is called from |
8b366b9c | 2989 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 2990 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
2991 | bgp_size_t size, struct bgp_nlri *mp_update, | |
2992 | struct bgp_nlri *mp_withdraw) | |
2993 | { | |
f7813c7c | 2994 | bgp_attr_parse_ret_t ret; |
d7c0a89a QY |
2995 | uint8_t flag = 0; |
2996 | uint8_t type = 0; | |
d62a17ae | 2997 | bgp_size_t length; |
d7c0a89a QY |
2998 | uint8_t *startp, *endp; |
2999 | uint8_t *attr_endp; | |
3000 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 3001 | /* we need the as4_path only until we have synthesized the as_path with |
3002 | * it */ | |
3003 | /* same goes for as4_aggregator */ | |
3004 | struct aspath *as4_path = NULL; | |
3005 | as_t as4_aggregator = 0; | |
3006 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
04fb21e2 | 3007 | struct transit *transit; |
d62a17ae | 3008 | |
3009 | /* Initialize bitmap. */ | |
3010 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
3011 | ||
3012 | /* End pointer of BGP attribute. */ | |
3013 | endp = BGP_INPUT_PNT(peer) + size; | |
3014 | ||
3015 | /* Get attributes to the end of attribute length. */ | |
3016 | while (BGP_INPUT_PNT(peer) < endp) { | |
3017 | /* Check remaining length check.*/ | |
3018 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
3019 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 3020 | flog_warn( |
e50f7cfd | 3021 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3022 | "%s: error BGP attribute length %lu is smaller than min len", |
3023 | peer->host, | |
3024 | (unsigned long)(endp | |
3025 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3026 | |
3027 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3028 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3029 | ret = BGP_ATTR_PARSE_ERROR; |
3030 | goto done; | |
d62a17ae | 3031 | } |
718e3744 | 3032 | |
d62a17ae | 3033 | /* Fetch attribute flag and type. */ |
3034 | startp = BGP_INPUT_PNT(peer); | |
3035 | /* "The lower-order four bits of the Attribute Flags octet are | |
3036 | unused. They MUST be zero when sent and MUST be ignored when | |
3037 | received." */ | |
3038 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
3039 | type = stream_getc(BGP_INPUT(peer)); | |
3040 | ||
3041 | /* Check whether Extended-Length applies and is in bounds */ | |
3042 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
3043 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 3044 | flog_warn( |
e50f7cfd | 3045 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3046 | "%s: Extended length set, but just %lu bytes of attr header", |
3047 | peer->host, | |
3048 | (unsigned long)(endp | |
3049 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3050 | |
3051 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3052 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3053 | ret = BGP_ATTR_PARSE_ERROR; |
3054 | goto done; | |
d62a17ae | 3055 | } |
718e3744 | 3056 | |
d62a17ae | 3057 | /* Check extended attribue length bit. */ |
3058 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
3059 | length = stream_getw(BGP_INPUT(peer)); | |
3060 | else | |
3061 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 3062 | |
d62a17ae | 3063 | /* If any attribute appears more than once in the UPDATE |
3064 | message, then the Error Subcode is set to Malformed Attribute | |
3065 | List. */ | |
718e3744 | 3066 | |
d62a17ae | 3067 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 3068 | flog_warn( |
e50f7cfd | 3069 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
3070 | "%s: error BGP attribute type %d appears twice in a message", |
3071 | peer->host, type); | |
718e3744 | 3072 | |
d62a17ae | 3073 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
3074 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3075 | ret = BGP_ATTR_PARSE_ERROR; |
3076 | goto done; | |
d62a17ae | 3077 | } |
3078 | ||
3079 | /* Set type to bitmap to check duplicate attribute. `type' is | |
3080 | unsigned char so it never overflow bitmap range. */ | |
3081 | ||
3082 | SET_BITMAP(seen, type); | |
3083 | ||
3084 | /* Overflow check. */ | |
3085 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3086 | ||
3087 | if (attr_endp > endp) { | |
ade6974d | 3088 | flog_warn( |
e50f7cfd | 3089 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3090 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3091 | peer->host, type, length, size, attr_endp, | |
3092 | endp); | |
dacffad4 QY |
3093 | /* |
3094 | * RFC 4271 6.3 | |
3095 | * If any recognized attribute has an Attribute | |
3096 | * Length that conflicts with the expected length | |
3097 | * (based on the attribute type code), then the | |
3098 | * Error Subcode MUST be set to Attribute Length | |
3099 | * Error. The Data field MUST contain the erroneous | |
3100 | * attribute (type, length, and value). | |
3101 | * ---------- | |
3102 | * We do not currently have a good way to determine the | |
3103 | * length of the attribute independent of the length | |
3104 | * received in the message. Instead we send the | |
3105 | * minimum between the amount of data we have and the | |
3106 | * amount specified by the attribute length field. | |
3107 | * | |
3108 | * Instead of directly passing in the packet buffer and | |
3109 | * offset we use the stream_get* functions to read into | |
3110 | * a stack buffer, since they perform bounds checking | |
3111 | * and we are working with untrusted data. | |
3112 | */ | |
ef56aee4 | 3113 | unsigned char ndata[peer->max_packet_size]; |
dacffad4 QY |
3114 | memset(ndata, 0x00, sizeof(ndata)); |
3115 | size_t lfl = | |
3116 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3117 | /* Rewind to end of flag field */ | |
763a5d3c | 3118 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3119 | /* Type */ |
3120 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3121 | /* Length */ | |
3122 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3123 | /* Value */ | |
3124 | size_t atl = attr_endp - startp; | |
3125 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3126 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3127 | ||
d62a17ae | 3128 | bgp_notify_send_with_data( |
3129 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3130 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3131 | ndl + lfl + 1); | |
3132 | ||
b6a171c7 QY |
3133 | ret = BGP_ATTR_PARSE_ERROR; |
3134 | goto done; | |
d62a17ae | 3135 | } |
3136 | ||
3137 | struct bgp_attr_parser_args attr_args = { | |
3138 | .peer = peer, | |
3139 | .length = length, | |
3140 | .attr = attr, | |
3141 | .type = type, | |
3142 | .flags = flag, | |
3143 | .startp = startp, | |
3144 | .total = attr_endp - startp, | |
3145 | }; | |
3146 | ||
3147 | ||
3148 | /* If any recognized attribute has Attribute Flags that conflict | |
3149 | with the Attribute Type Code, then the Error Subcode is set | |
3150 | to | |
3151 | Attribute Flags Error. The Data field contains the erroneous | |
3152 | attribute (type, length and value). */ | |
3153 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3154 | ret = bgp_attr_malformed( |
3155 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3156 | attr_args.total); | |
3157 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3158 | continue; | |
b6a171c7 | 3159 | goto done; |
d62a17ae | 3160 | } |
3161 | ||
3162 | /* OK check attribute and store it's value. */ | |
3163 | switch (type) { | |
3164 | case BGP_ATTR_ORIGIN: | |
3165 | ret = bgp_attr_origin(&attr_args); | |
3166 | break; | |
3167 | case BGP_ATTR_AS_PATH: | |
3168 | ret = bgp_attr_aspath(&attr_args); | |
3169 | break; | |
3170 | case BGP_ATTR_AS4_PATH: | |
3171 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3172 | break; | |
3173 | case BGP_ATTR_NEXT_HOP: | |
3174 | ret = bgp_attr_nexthop(&attr_args); | |
3175 | break; | |
3176 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3177 | ret = bgp_attr_med(&attr_args); | |
3178 | break; | |
3179 | case BGP_ATTR_LOCAL_PREF: | |
3180 | ret = bgp_attr_local_pref(&attr_args); | |
3181 | break; | |
3182 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3183 | ret = bgp_attr_atomic(&attr_args); | |
3184 | break; | |
3185 | case BGP_ATTR_AGGREGATOR: | |
3186 | ret = bgp_attr_aggregator(&attr_args); | |
3187 | break; | |
3188 | case BGP_ATTR_AS4_AGGREGATOR: | |
3189 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3190 | &as4_aggregator, | |
3191 | &as4_aggregator_addr); | |
3192 | break; | |
3193 | case BGP_ATTR_COMMUNITIES: | |
3194 | ret = bgp_attr_community(&attr_args); | |
3195 | break; | |
3196 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3197 | ret = bgp_attr_large_community(&attr_args); | |
3198 | break; | |
3199 | case BGP_ATTR_ORIGINATOR_ID: | |
3200 | ret = bgp_attr_originator_id(&attr_args); | |
3201 | break; | |
3202 | case BGP_ATTR_CLUSTER_LIST: | |
3203 | ret = bgp_attr_cluster_list(&attr_args); | |
3204 | break; | |
3205 | case BGP_ATTR_MP_REACH_NLRI: | |
3206 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3207 | break; | |
3208 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3209 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3210 | break; | |
3211 | case BGP_ATTR_EXT_COMMUNITIES: | |
3212 | ret = bgp_attr_ext_communities(&attr_args); | |
3213 | break; | |
1e20238a | 3214 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3215 | case BGP_ATTR_VNC: |
65efcfce | 3216 | #endif |
d62a17ae | 3217 | case BGP_ATTR_ENCAP: |
3218 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3219 | startp); | |
3220 | break; | |
3221 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3222 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3223 | break; |
7fd077aa | 3224 | case BGP_ATTR_PMSI_TUNNEL: |
3225 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3226 | break; | |
9a659715 PG |
3227 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3228 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3229 | break; | |
d62a17ae | 3230 | default: |
3231 | ret = bgp_attr_unknown(&attr_args); | |
3232 | break; | |
3233 | } | |
3234 | ||
3235 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3236 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3237 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3238 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3239 | goto done; |
d62a17ae | 3240 | } |
3241 | ||
9b9df989 | 3242 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3243 | goto done; |
9b9df989 DS |
3244 | } |
3245 | ||
d62a17ae | 3246 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3247 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3248 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3249 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3250 | goto done; |
d62a17ae | 3251 | } |
3252 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3253 | flog_warn( |
e50f7cfd | 3254 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3255 | "%s: Attribute %s, parse error - treating as withdrawal", |
3256 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3257 | goto done; |
d62a17ae | 3258 | } |
3259 | ||
3260 | /* Check the fetched length. */ | |
3261 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3262 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3263 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3264 | peer->host, lookup_msg(attr_str, type, NULL)); |
3265 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3266 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3267 | ret = BGP_ATTR_PARSE_ERROR; |
3268 | goto done; | |
d62a17ae | 3269 | } |
718e3744 | 3270 | } |
d62a17ae | 3271 | |
e5d4cda0 HS |
3272 | /* |
3273 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3274 | * About Prefix-SID path attribute, | |
3275 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3276 | * may only appear in a BGP Prefix-SID attribute attached to | |
3277 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3278 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3279 | */ | |
3280 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3281 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3282 | ||
d62a17ae | 3283 | /* Check final read pointer is same as end pointer. */ |
3284 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3285 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3286 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3287 | lookup_msg(attr_str, type, NULL)); |
3288 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3289 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3290 | |
3291 | ret = BGP_ATTR_PARSE_ERROR; | |
3292 | goto done; | |
d62a17ae | 3293 | } |
3294 | ||
88f33d66 | 3295 | /* |
3296 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3297 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3298 | * This is implemented below and will result in a NOTIFICATION. If the | |
3299 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3300 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3301 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3302 | * | |
3303 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3304 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3305 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3306 | * speaker that receives the message SHOULD ignore this attribute. | |
3307 | */ | |
3308 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3309 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3310 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3311 | ret = BGP_ATTR_PARSE_ERROR; |
3312 | goto done; | |
88f33d66 | 3313 | } |
3314 | } | |
3315 | ||
d62a17ae | 3316 | /* Check all mandatory well-known attributes are present */ |
11dbcdd3 DA |
3317 | ret = bgp_attr_check(peer, attr); |
3318 | if (ret < 0) | |
b6a171c7 | 3319 | goto done; |
d62a17ae | 3320 | |
3321 | /* | |
3322 | * At this place we can see whether we got AS4_PATH and/or | |
3323 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3324 | * We can not do this before we've read all attributes because | |
3325 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3326 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3327 | * in relationship to AGGREGATOR. | |
3328 | * So, to be defensive, we are not relying on any order and read | |
3329 | * all attributes first, including these 32bit ones, and now, | |
3330 | * afterwards, we look what and if something is to be done for as4. | |
3331 | * | |
3332 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3333 | * MP_UNREACH_NLRI. | |
3334 | */ | |
3335 | /* actually... this doesn't ever return failure currently, but | |
3336 | * better safe than sorry */ | |
3337 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3338 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3339 | &as4_aggregator_addr)) { | |
3340 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3341 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3342 | ret = BGP_ATTR_PARSE_ERROR; |
3343 | goto done; | |
d62a17ae | 3344 | } |
3345 | ||
d62a17ae | 3346 | /* |
3347 | * Finally do the checks on the aspath we did not do yet | |
3348 | * because we waited for a potentially synthesized aspath. | |
3349 | */ | |
3350 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3351 | ret = bgp_attr_aspath_check(peer, attr); | |
3352 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3353 | goto done; |
d62a17ae | 3354 | } |
718e3744 | 3355 | |
b6a171c7 | 3356 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3357 | done: |
5e0e9c09 | 3358 | |
b6a171c7 QY |
3359 | /* |
3360 | * At this stage, we have done all fiddling with as4, and the | |
3361 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3362 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3363 | * to save memory | |
3364 | */ | |
3365 | if (as4_path) { | |
3366 | /* | |
3367 | * unintern - it is in the hash | |
3368 | * The flag that we got this is still there, but that | |
3369 | * does not do any trouble | |
3370 | */ | |
3371 | aspath_unintern(&as4_path); | |
3372 | } | |
3373 | ||
04fb21e2 | 3374 | transit = bgp_attr_get_transit(attr); |
b6a171c7 QY |
3375 | if (ret != BGP_ATTR_PARSE_ERROR) { |
3376 | /* Finally intern unknown attribute. */ | |
04fb21e2 DS |
3377 | if (transit) |
3378 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
b6a171c7 QY |
3379 | if (attr->encap_subtlvs) |
3380 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3381 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3382 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3383 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3384 | bgp_attr_get_vnc_subtlvs(attr); | |
3385 | ||
3386 | if (vnc_subtlvs) | |
3387 | bgp_attr_set_vnc_subtlvs( | |
3388 | attr, | |
3389 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
5e0e9c09 QY |
3390 | #endif |
3391 | } else { | |
04fb21e2 DS |
3392 | if (transit) { |
3393 | transit_free(transit); | |
3394 | bgp_attr_set_transit(attr, NULL); | |
5e0e9c09 QY |
3395 | } |
3396 | ||
3397 | bgp_attr_flush_encap(attr); | |
3398 | }; | |
3399 | ||
3400 | /* Sanity checks */ | |
04fb21e2 DS |
3401 | transit = bgp_attr_get_transit(attr); |
3402 | if (transit) | |
3403 | assert(transit->refcnt > 0); | |
d62a17ae | 3404 | if (attr->encap_subtlvs) |
5e0e9c09 | 3405 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3406 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3407 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3408 | bgp_attr_get_vnc_subtlvs(attr); | |
3409 | ||
3410 | if (vnc_subtlvs) | |
3411 | assert(vnc_subtlvs->refcnt > 0); | |
bede7744 | 3412 | #endif |
718e3744 | 3413 | |
b6a171c7 | 3414 | return ret; |
d62a17ae | 3415 | } |
3416 | ||
f4bd90c5 LK |
3417 | /* |
3418 | * Extract the tunnel type from extended community | |
3419 | */ | |
3420 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3421 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3422 | { |
3423 | struct ecommunity *ecom; | |
f6e07e1b DS |
3424 | uint32_t i; |
3425 | ||
f4bd90c5 | 3426 | if (!attr) |
fa346686 | 3427 | return; |
f4bd90c5 LK |
3428 | |
3429 | ecom = attr->ecommunity; | |
3430 | if (!ecom || !ecom->size) | |
fa346686 | 3431 | return; |
f4bd90c5 LK |
3432 | |
3433 | for (i = 0; i < ecom->size; i++) { | |
3434 | uint8_t *pnt; | |
3435 | uint8_t type, sub_type; | |
3436 | ||
3437 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3438 | type = pnt[0]; | |
3439 | sub_type = pnt[1]; | |
3440 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3441 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3442 | continue; | |
3443 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3444 | return; |
f4bd90c5 LK |
3445 | } |
3446 | ||
fa346686 | 3447 | return; |
f4bd90c5 LK |
3448 | } |
3449 | ||
d62a17ae | 3450 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3451 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3452 | struct attr *attr) | |
3453 | { | |
3454 | size_t sizep; | |
3455 | iana_afi_t pkt_afi; | |
5c525538 | 3456 | iana_safi_t pkt_safi; |
d62a17ae | 3457 | afi_t nh_afi; |
3458 | ||
3459 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3460 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3461 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3462 | sizep = stream_get_endp(s); | |
3463 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3464 | ||
3465 | ||
3466 | /* Convert AFI, SAFI to values for packet. */ | |
3467 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3468 | ||
3469 | stream_putw(s, pkt_afi); /* AFI */ | |
3470 | stream_putc(s, pkt_safi); /* SAFI */ | |
3471 | ||
3472 | /* Nexthop AFI */ | |
ce78a6fb | 3473 | if (afi == AFI_IP |
e496b420 HS |
3474 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3475 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3476 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3477 | else if (safi == SAFI_FLOWSPEC) |
3478 | nh_afi = afi; | |
d62a17ae | 3479 | else |
3480 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3481 | ||
3482 | /* Nexthop */ | |
3483 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3484 | switch (nh_afi) { | |
3485 | case AFI_IP: | |
3486 | switch (safi) { | |
3487 | case SAFI_UNICAST: | |
3488 | case SAFI_MULTICAST: | |
3489 | case SAFI_LABELED_UNICAST: | |
3490 | stream_putc(s, 4); | |
3491 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3492 | break; | |
3493 | case SAFI_MPLS_VPN: | |
3494 | stream_putc(s, 12); | |
3495 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3496 | stream_putl(s, 0); | |
3497 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3498 | break; | |
3499 | case SAFI_ENCAP: | |
3500 | case SAFI_EVPN: | |
3501 | stream_putc(s, 4); | |
3502 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3503 | break; | |
7c40bf39 | 3504 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3505 | if (attr->mp_nexthop_len == 0) |
3506 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3507 | else { | |
3508 | stream_putc(s, attr->mp_nexthop_len); | |
3509 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3510 | } | |
d62a17ae | 3511 | default: |
3512 | break; | |
3513 | } | |
3514 | break; | |
3515 | case AFI_IP6: | |
3516 | switch (safi) { | |
3517 | case SAFI_UNICAST: | |
3518 | case SAFI_MULTICAST: | |
3519 | case SAFI_LABELED_UNICAST: | |
3520 | case SAFI_EVPN: { | |
3521 | if (attr->mp_nexthop_len | |
3522 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3523 | stream_putc(s, | |
3524 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
3525 | stream_put(s, &attr->mp_nexthop_global, | |
3526 | IPV6_MAX_BYTELEN); | |
3527 | stream_put(s, &attr->mp_nexthop_local, | |
3528 | IPV6_MAX_BYTELEN); | |
3529 | } else { | |
3530 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3531 | stream_put(s, &attr->mp_nexthop_global, | |
3532 | IPV6_MAX_BYTELEN); | |
3533 | } | |
3534 | } break; | |
3535 | case SAFI_MPLS_VPN: { | |
3536 | if (attr->mp_nexthop_len | |
3537 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
3538 | stream_putc(s, 24); | |
3539 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3540 | stream_putl(s, 0); | |
3541 | stream_put(s, &attr->mp_nexthop_global, | |
3542 | IPV6_MAX_BYTELEN); | |
3543 | } else if (attr->mp_nexthop_len | |
3544 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3545 | stream_putc(s, 48); | |
3546 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3547 | stream_putl(s, 0); | |
3548 | stream_put(s, &attr->mp_nexthop_global, | |
3549 | IPV6_MAX_BYTELEN); | |
3550 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3551 | stream_putl(s, 0); | |
3552 | stream_put(s, &attr->mp_nexthop_local, | |
3553 | IPV6_MAX_BYTELEN); | |
3554 | } | |
3555 | } break; | |
3556 | case SAFI_ENCAP: | |
3557 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3558 | stream_put(s, &attr->mp_nexthop_global, | |
3559 | IPV6_MAX_BYTELEN); | |
3560 | break; | |
7c40bf39 | 3561 | case SAFI_FLOWSPEC: |
3562 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 3563 | default: |
3564 | break; | |
3565 | } | |
3566 | break; | |
8c71e481 | 3567 | default: |
a83da8e1 | 3568 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 3569 | flog_err( |
e50f7cfd | 3570 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
3571 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
3572 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 3573 | break; |
3574 | } | |
3575 | ||
3576 | /* SNPA */ | |
3577 | stream_putc(s, 0); | |
3578 | return sizep; | |
3579 | } | |
3580 | ||
3581 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
3582 | const struct prefix *p, |
3583 | const struct prefix_rd *prd, mpls_label_t *label, | |
3584 | uint32_t num_labels, int addpath_encode, | |
3585 | uint32_t addpath_tx_id, struct attr *attr) | |
d62a17ae | 3586 | { |
3587 | if (safi == SAFI_MPLS_VPN) { | |
3588 | if (addpath_encode) | |
3589 | stream_putl(s, addpath_tx_id); | |
3590 | /* Label, RD, Prefix write. */ | |
3591 | stream_putc(s, p->prefixlen + 88); | |
3592 | stream_put(s, label, BGP_LABEL_BYTES); | |
3593 | stream_put(s, prd->val, 8); | |
3594 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
3595 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
3596 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
3597 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
3598 | addpath_encode, addpath_tx_id); | |
d62a17ae | 3599 | } else if (safi == SAFI_LABELED_UNICAST) { |
3600 | /* Prefix write with label. */ | |
ec15e1b5 QY |
3601 | stream_put_labeled_prefix(s, p, label, addpath_encode, |
3602 | addpath_tx_id); | |
7c40bf39 | 3603 | } else if (safi == SAFI_FLOWSPEC) { |
f1af8f04 PG |
3604 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
3605 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
3606 | p->u.prefix_flowspec.prefixlen); | |
d62a17ae | 3607 | } else |
3608 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
3609 | } | |
3610 | ||
5f040085 DS |
3611 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
3612 | const struct prefix *p) | |
d62a17ae | 3613 | { |
3614 | int size = PSIZE(p->prefixlen); | |
3615 | if (safi == SAFI_MPLS_VPN) | |
3616 | size += 88; | |
4195afbf EDP |
3617 | else if (safi == SAFI_LABELED_UNICAST) |
3618 | size += BGP_LABEL_BYTES; | |
d62a17ae | 3619 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
3620 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
3621 | // type-5 | |
3622 | return size; | |
8c71e481 PM |
3623 | } |
3624 | ||
f4c89855 | 3625 | /* |
65efcfce | 3626 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 3627 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 3628 | * almost the same TLV format |
f4c89855 | 3629 | */ |
d62a17ae | 3630 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
3631 | struct stream *s, struct attr *attr, | |
3632 | uint8_t attrtype) | |
3633 | { | |
3634 | unsigned int attrlenfield = 0; | |
3635 | unsigned int attrhdrlen = 0; | |
3636 | struct bgp_attr_encap_subtlv *subtlvs; | |
3637 | struct bgp_attr_encap_subtlv *st; | |
3638 | const char *attrname; | |
3639 | ||
9d303b37 DL |
3640 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
3641 | && (!attr->encap_tunneltype | |
3642 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 3643 | return; |
3644 | ||
3645 | switch (attrtype) { | |
f4c89855 | 3646 | case BGP_ATTR_ENCAP: |
d62a17ae | 3647 | attrname = "Tunnel Encap"; |
3648 | subtlvs = attr->encap_subtlvs; | |
3649 | if (subtlvs == NULL) /* nothing to do */ | |
3650 | return; | |
3651 | /* | |
3652 | * The tunnel encap attr has an "outer" tlv. | |
3653 | * T = tunneltype, | |
3654 | * L = total length of subtlvs, | |
3655 | * V = concatenated subtlvs. | |
3656 | */ | |
3657 | attrlenfield = 2 + 2; /* T + L */ | |
3658 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
3659 | break; | |
f4c89855 | 3660 | |
1e20238a | 3661 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 3662 | case BGP_ATTR_VNC: |
d62a17ae | 3663 | attrname = "VNC"; |
91ebf12c | 3664 | subtlvs = bgp_attr_get_vnc_subtlvs(attr); |
d62a17ae | 3665 | if (subtlvs == NULL) /* nothing to do */ |
3666 | return; | |
3667 | attrlenfield = 0; /* no outer T + L */ | |
3668 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
3669 | break; | |
65efcfce LB |
3670 | #endif |
3671 | ||
f4c89855 | 3672 | default: |
d62a17ae | 3673 | assert(0); |
3674 | } | |
3675 | ||
3676 | /* compute attr length */ | |
3677 | for (st = subtlvs; st; st = st->next) { | |
3678 | attrlenfield += (attrhdrlen + st->length); | |
3679 | } | |
3680 | ||
3681 | if (attrlenfield > 0xffff) { | |
3682 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
3683 | attrname, attrlenfield); | |
3684 | return; | |
3685 | } | |
3686 | ||
3687 | if (attrlenfield > 0xff) { | |
3688 | /* 2-octet length field */ | |
996c9314 LB |
3689 | stream_putc(s, |
3690 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3691 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3692 | stream_putc(s, attrtype); |
3693 | stream_putw(s, attrlenfield & 0xffff); | |
3694 | } else { | |
3695 | /* 1-octet length field */ | |
3696 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
3697 | stream_putc(s, attrtype); | |
3698 | stream_putc(s, attrlenfield & 0xff); | |
3699 | } | |
3700 | ||
3701 | if (attrtype == BGP_ATTR_ENCAP) { | |
3702 | /* write outer T+L */ | |
3703 | stream_putw(s, attr->encap_tunneltype); | |
3704 | stream_putw(s, attrlenfield - 4); | |
3705 | } | |
3706 | ||
3707 | /* write each sub-tlv */ | |
3708 | for (st = subtlvs; st; st = st->next) { | |
3709 | if (attrtype == BGP_ATTR_ENCAP) { | |
3710 | stream_putc(s, st->type); | |
3711 | stream_putc(s, st->length); | |
1e20238a | 3712 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 3713 | } else { |
3714 | stream_putw(s, st->type); | |
3715 | stream_putw(s, st->length); | |
65efcfce | 3716 | #endif |
d62a17ae | 3717 | } |
3718 | stream_put(s, st->value, st->length); | |
3719 | } | |
f4c89855 | 3720 | } |
f4c89855 | 3721 | |
d62a17ae | 3722 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 3723 | { |
d62a17ae | 3724 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
3725 | the attr length */ | |
3726 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
3727 | } |
3728 | ||
3dc339cd | 3729 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
3730 | { |
3731 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
3732 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
3733 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3734 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
3735 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3736 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
3737 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3738 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
3739 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3740 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
3741 | return true; |
3742 | return false; | |
6b5a72a3 DA |
3743 | } |
3744 | ||
718e3744 | 3745 | /* Make attribute packet. */ |
d62a17ae | 3746 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
3747 | struct stream *s, struct attr *attr, | |
3748 | struct bpacket_attr_vec_arr *vecarr, | |
3749 | struct prefix *p, afi_t afi, safi_t safi, | |
3750 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
3751 | mpls_label_t *label, uint32_t num_labels, |
3752 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 3753 | { |
3754 | size_t cp; | |
3755 | size_t aspath_sizep; | |
3756 | struct aspath *aspath; | |
3757 | int send_as4_path = 0; | |
3758 | int send_as4_aggregator = 0; | |
8cff42ad DA |
3759 | bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
3760 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV); | |
d62a17ae | 3761 | |
3762 | if (!bgp) | |
3763 | bgp = peer->bgp; | |
3764 | ||
3765 | /* Remember current pointer. */ | |
3766 | cp = stream_get_endp(s); | |
3767 | ||
3768 | if (p | |
3769 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3770 | && !peer_cap_enhe(peer, afi, safi))) { | |
3771 | size_t mpattrlen_pos = 0; | |
3772 | ||
3773 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3774 | vecarr, attr); | |
996c9314 LB |
3775 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3776 | num_labels, addpath_encode, | |
3777 | addpath_tx_id, attr); | |
d62a17ae | 3778 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3779 | } |
d62a17ae | 3780 | |
3781 | /* Origin attribute. */ | |
3782 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3783 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3784 | stream_putc(s, 1); | |
3785 | stream_putc(s, attr->origin); | |
3786 | ||
3787 | /* AS path attribute. */ | |
3788 | ||
3789 | /* If remote-peer is EBGP */ | |
3790 | if (peer->sort == BGP_PEER_EBGP | |
3791 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3792 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3793 | || attr->aspath->segments == NULL) | |
3794 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3795 | PEER_FLAG_RSERVER_CLIENT))) { | |
3796 | aspath = aspath_dup(attr->aspath); | |
3797 | ||
3798 | /* Even though we may not be configured for confederations we | |
3799 | * may have | |
3800 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3801 | aspath = aspath_delete_confed_seq(aspath); | |
3802 | ||
3803 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3804 | /* Stuff our path CONFED_ID on the front */ | |
3805 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3806 | } else { | |
3807 | if (peer->change_local_as) { | |
3808 | /* If replace-as is specified, we only use the | |
3809 | change_local_as when | |
3810 | advertising routes. */ | |
6b5a72a3 DA |
3811 | if (!CHECK_FLAG(peer->flags, |
3812 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
3813 | if (bgp_append_local_as(peer, afi, | |
3814 | safi)) | |
3815 | aspath = aspath_add_seq( | |
3816 | aspath, peer->local_as); | |
d62a17ae | 3817 | aspath = aspath_add_seq(aspath, |
3818 | peer->change_local_as); | |
3819 | } else { | |
3820 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3821 | } | |
3822 | } | |
3823 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3824 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3825 | * thing */ | |
3826 | aspath = aspath_dup(attr->aspath); | |
3827 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3828 | } else | |
3829 | aspath = attr->aspath; | |
3830 | ||
3831 | /* If peer is not AS4 capable, then: | |
3832 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3833 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3834 | * segment | |
3835 | * types are in it (i.e. exclude them if they are there) | |
3836 | * AND do this only if there is at least one asnum > 65535 in the | |
3837 | * path! | |
3838 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3839 | * change | |
3840 | * all ASnums > 65535 to BGP_AS_TRANS | |
3841 | */ | |
3842 | ||
3843 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3844 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3845 | aspath_sizep = stream_get_endp(s); | |
3846 | stream_putw(s, 0); | |
3847 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
3848 | ||
3849 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
3850 | * in the path | |
3851 | */ | |
3852 | if (!use32bit && aspath_has_as4(aspath)) | |
3853 | send_as4_path = | |
3854 | 1; /* we'll do this later, at the correct place */ | |
3855 | ||
3856 | /* Nexthop attribute. */ | |
3857 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
3858 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
3859 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
3860 | ||
d62a17ae | 3861 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
3862 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3863 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3864 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3865 | attr); | |
3866 | stream_putc(s, 4); | |
3867 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
3868 | } else if (peer_cap_enhe(from, afi, safi) |
3869 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 3870 | /* |
3871 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
3872 | * received with Extended Next-hop capability in this |
3873 | * or another vrf and is now being advertised to | |
3874 | * non-ENHE peers. Since peer_cap_enhe only checks | |
3875 | * peers in this vrf, also check the nh_afi to catch | |
3876 | * the case where the originator was in another vrf. | |
d62a17ae | 3877 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
3878 | * to enable implicit next-hop self with correct A-F |
3879 | * (ipv4 address family). | |
d62a17ae | 3880 | */ |
3881 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3882 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
3883 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
3884 | NULL); | |
3885 | stream_putc(s, 4); | |
3886 | stream_put_ipv4(s, 0); | |
3887 | } | |
718e3744 | 3888 | } |
d62a17ae | 3889 | |
3890 | /* MED attribute. */ | |
3891 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
3892 | || bgp->maxmed_active) { | |
3893 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3894 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
3895 | stream_putc(s, 4); | |
3896 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
3897 | : attr->med)); | |
3898 | } | |
3899 | ||
3900 | /* Local preference. */ | |
3901 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
3902 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3903 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
3904 | stream_putc(s, 4); | |
3905 | stream_putl(s, attr->local_pref); | |
3906 | } | |
3907 | ||
3908 | /* Atomic aggregate. */ | |
3909 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
3910 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3911 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
3912 | stream_putc(s, 0); | |
3913 | } | |
3914 | ||
3915 | /* Aggregator. */ | |
3916 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
3917 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
3918 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
3919 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
3920 | ||
3921 | if (use32bit) { | |
3922 | /* AS4 capable peer */ | |
3923 | stream_putc(s, 8); | |
3924 | stream_putl(s, attr->aggregator_as); | |
3925 | } else { | |
3926 | /* 2-byte AS peer */ | |
3927 | stream_putc(s, 6); | |
3928 | ||
3929 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
3930 | * used? */ | |
48e1932b | 3931 | if (attr->aggregator_as > UINT16_MAX) { |
d62a17ae | 3932 | stream_putw(s, BGP_AS_TRANS); |
3933 | ||
3934 | /* we have to send AS4_AGGREGATOR, too. | |
3935 | * we'll do that later in order to send | |
3936 | * attributes in ascending | |
3937 | * order. | |
3938 | */ | |
3939 | send_as4_aggregator = 1; | |
3940 | } else | |
d7c0a89a | 3941 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 3942 | } |
3943 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
3944 | } | |
3945 | ||
3946 | /* Community attribute. */ | |
3947 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
3948 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
3949 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
3950 | stream_putc(s, |
3951 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3952 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3953 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3954 | stream_putw(s, attr->community->size * 4); | |
3955 | } else { | |
996c9314 LB |
3956 | stream_putc(s, |
3957 | BGP_ATTR_FLAG_OPTIONAL | |
3958 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3959 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
3960 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 3961 | } |
d62a17ae | 3962 | stream_put(s, attr->community->val, attr->community->size * 4); |
3963 | } | |
3964 | ||
3965 | /* | |
3966 | * Large Community attribute. | |
3967 | */ | |
3968 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
3969 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
3970 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 3971 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
3972 | stream_putc(s, |
3973 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
3974 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3975 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3976 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 3977 | } else { |
996c9314 LB |
3978 | stream_putc(s, |
3979 | BGP_ATTR_FLAG_OPTIONAL | |
3980 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 3981 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 3982 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 3983 | } |
d62a17ae | 3984 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 3985 | lcom_length(attr->lcommunity)); |
d62a17ae | 3986 | } |
4372df71 | 3987 | |
d62a17ae | 3988 | /* Route Reflector. */ |
3989 | if (peer->sort == BGP_PEER_IBGP && from | |
3990 | && from->sort == BGP_PEER_IBGP) { | |
779fee93 DS |
3991 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); |
3992 | ||
d62a17ae | 3993 | /* Originator ID. */ |
3994 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
3995 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
3996 | stream_putc(s, 4); | |
3997 | ||
3998 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
3999 | stream_put_in_addr(s, &attr->originator_id); | |
4000 | else | |
4001 | stream_put_in_addr(s, &from->remote_id); | |
4002 | ||
4003 | /* Cluster list. */ | |
4004 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4005 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
4006 | ||
779fee93 DS |
4007 | if (cluster) { |
4008 | stream_putc(s, cluster->length + 4); | |
d62a17ae | 4009 | /* If this peer configuration's parent BGP has |
4010 | * cluster_id. */ | |
4011 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4012 | stream_put_in_addr(s, &bgp->cluster_id); | |
4013 | else | |
4014 | stream_put_in_addr(s, &bgp->router_id); | |
779fee93 | 4015 | stream_put(s, cluster->list, cluster->length); |
d62a17ae | 4016 | } else { |
4017 | stream_putc(s, 4); | |
4018 | /* If this peer configuration's parent BGP has | |
4019 | * cluster_id. */ | |
4020 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4021 | stream_put_in_addr(s, &bgp->cluster_id); | |
4022 | else | |
4023 | stream_put_in_addr(s, &bgp->router_id); | |
4024 | } | |
4025 | } | |
4372df71 | 4026 | |
d62a17ae | 4027 | /* Extended Communities attribute. */ |
4028 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
4029 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
4030 | if (peer->sort == BGP_PEER_IBGP | |
4031 | || peer->sort == BGP_PEER_CONFED) { | |
4032 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
4033 | stream_putc(s, |
4034 | BGP_ATTR_FLAG_OPTIONAL | |
4035 | | BGP_ATTR_FLAG_TRANS | |
4036 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4037 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
4038 | stream_putw(s, attr->ecommunity->size * 8); | |
4039 | } else { | |
996c9314 LB |
4040 | stream_putc(s, |
4041 | BGP_ATTR_FLAG_OPTIONAL | |
4042 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4043 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
4044 | stream_putc(s, attr->ecommunity->size * 8); | |
4045 | } | |
4046 | stream_put(s, attr->ecommunity->val, | |
4047 | attr->ecommunity->size * 8); | |
4048 | } else { | |
d7c0a89a | 4049 | uint8_t *pnt; |
d62a17ae | 4050 | int tbit; |
4051 | int ecom_tr_size = 0; | |
f6e07e1b | 4052 | uint32_t i; |
d62a17ae | 4053 | |
4054 | for (i = 0; i < attr->ecommunity->size; i++) { | |
4055 | pnt = attr->ecommunity->val + (i * 8); | |
4056 | tbit = *pnt; | |
4057 | ||
4058 | if (CHECK_FLAG(tbit, | |
4059 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4060 | continue; | |
4061 | ||
4062 | ecom_tr_size++; | |
4063 | } | |
4064 | ||
4065 | if (ecom_tr_size) { | |
4066 | if (ecom_tr_size * 8 > 255) { | |
4067 | stream_putc( | |
4068 | s, | |
4069 | BGP_ATTR_FLAG_OPTIONAL | |
4070 | | BGP_ATTR_FLAG_TRANS | |
4071 | | BGP_ATTR_FLAG_EXTLEN); | |
4072 | stream_putc(s, | |
4073 | BGP_ATTR_EXT_COMMUNITIES); | |
4074 | stream_putw(s, ecom_tr_size * 8); | |
4075 | } else { | |
4076 | stream_putc( | |
4077 | s, | |
4078 | BGP_ATTR_FLAG_OPTIONAL | |
4079 | | BGP_ATTR_FLAG_TRANS); | |
4080 | stream_putc(s, | |
4081 | BGP_ATTR_EXT_COMMUNITIES); | |
4082 | stream_putc(s, ecom_tr_size * 8); | |
4083 | } | |
4084 | ||
4085 | for (i = 0; i < attr->ecommunity->size; i++) { | |
4086 | pnt = attr->ecommunity->val + (i * 8); | |
4087 | tbit = *pnt; | |
4088 | ||
4089 | if (CHECK_FLAG( | |
4090 | tbit, | |
4091 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4092 | continue; | |
4093 | ||
4094 | stream_put(s, pnt, 8); | |
4095 | } | |
4096 | } | |
4097 | } | |
4098 | } | |
4372df71 | 4099 | |
d62a17ae | 4100 | /* Label index attribute. */ |
4101 | if (safi == SAFI_LABELED_UNICAST) { | |
4102 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4103 | uint32_t label_index; |
d62a17ae | 4104 | |
4105 | label_index = attr->label_index; | |
4106 | ||
4107 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4108 | stream_putc(s, |
4109 | BGP_ATTR_FLAG_OPTIONAL | |
4110 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4111 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4112 | stream_putc(s, 10); | |
4113 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4114 | stream_putw(s, | |
4115 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4116 | stream_putc(s, 0); // reserved | |
4117 | stream_putw(s, 0); // flags | |
4118 | stream_putl(s, label_index); | |
4119 | } | |
4372df71 | 4120 | } |
d62a17ae | 4121 | } |
4122 | ||
e496b420 | 4123 | /* SRv6 Service Information Attribute. */ |
dbcf19b8 | 4124 | if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) { |
e496b420 HS |
4125 | if (attr->srv6_l3vpn) { |
4126 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4127 | | BGP_ATTR_FLAG_TRANS); | |
4128 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4129 | stream_putc(s, 24); /* tlv len */ | |
4130 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); | |
4131 | stream_putw(s, 21); /* sub-tlv len */ | |
4132 | stream_putc(s, 0); /* reserved */ | |
4133 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4134 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4135 | stream_putc(s, 0); /* sid_flags */ | |
4136 | stream_putw(s, 0xffff); /* endpoint */ | |
4137 | stream_putc(s, 0); /* reserved */ | |
4138 | } else if (attr->srv6_vpn) { | |
4139 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4140 | | BGP_ATTR_FLAG_TRANS); | |
4141 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4142 | stream_putc(s, 22); /* tlv len */ | |
4143 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4144 | stream_putw(s, 0x13); /* tlv len */ | |
4145 | stream_putc(s, 0x00); /* reserved */ | |
4146 | stream_putc(s, 0x01); /* sid_type */ | |
4147 | stream_putc(s, 0x00); /* sif_flags */ | |
4148 | stream_put(s, &attr->srv6_vpn->sid, | |
4149 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4150 | } | |
4151 | } | |
4152 | ||
d62a17ae | 4153 | if (send_as4_path) { |
4154 | /* If the peer is NOT As4 capable, AND */ | |
4155 | /* there are ASnums > 65535 in path THEN | |
4156 | * give out AS4_PATH */ | |
4157 | ||
4158 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4159 | * path segments! | |
4160 | * Hm, I wonder... confederation things *should* only be at | |
4161 | * the beginning of an aspath, right? Then we should use | |
4162 | * aspath_delete_confed_seq for this, because it is already | |
4163 | * there! (JK) | |
4164 | * Folks, talk to me: what is reasonable here!? | |
4165 | */ | |
4166 | aspath = aspath_delete_confed_seq(aspath); | |
4167 | ||
996c9314 LB |
4168 | stream_putc(s, |
4169 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4170 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4171 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4172 | aspath_sizep = stream_get_endp(s); | |
4173 | stream_putw(s, 0); | |
4174 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4175 | } | |
4176 | ||
4177 | if (aspath != attr->aspath) | |
4178 | aspath_free(aspath); | |
4179 | ||
4180 | if (send_as4_aggregator) { | |
4181 | /* send AS4_AGGREGATOR, at this place */ | |
4182 | /* this section of code moved here in order to ensure the | |
4183 | * correct | |
4184 | * *ascending* order of attributes | |
4185 | */ | |
4186 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4187 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4188 | stream_putc(s, 8); | |
4189 | stream_putl(s, attr->aggregator_as); | |
4190 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4191 | } | |
4192 | ||
4193 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4194 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4195 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4196 | /* Tunnel Encap attribute */ | |
4197 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4198 | |
1e20238a | 4199 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4200 | /* VNC attribute */ |
4201 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4202 | #endif |
d62a17ae | 4203 | } |
587ff0fd | 4204 | |
a21bd7a3 DW |
4205 | /* PMSI Tunnel */ |
4206 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4207 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4208 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4209 | stream_putc(s, 9); // Length | |
4210 | stream_putc(s, 0); // Flags | |
2a3f51cf | 4211 | stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr)); |
996c9314 LB |
4212 | stream_put(s, &(attr->label), |
4213 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4214 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4215 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4216 | } |
4217 | ||
d62a17ae | 4218 | /* Unknown transit attribute. */ |
04fb21e2 DS |
4219 | struct transit *transit = bgp_attr_get_transit(attr); |
4220 | ||
4221 | if (transit) | |
4222 | stream_put(s, transit->val, transit->length); | |
718e3744 | 4223 | |
d62a17ae | 4224 | /* Return total size of attribute. */ |
4225 | return stream_get_endp(s) - cp; | |
718e3744 | 4226 | } |
4227 | ||
d62a17ae | 4228 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4229 | { |
d62a17ae | 4230 | unsigned long attrlen_pnt; |
4231 | iana_afi_t pkt_afi; | |
5c525538 | 4232 | iana_safi_t pkt_safi; |
718e3744 | 4233 | |
d62a17ae | 4234 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4235 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4236 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4237 | |
d62a17ae | 4238 | attrlen_pnt = stream_get_endp(s); |
4239 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4240 | |
d62a17ae | 4241 | /* Convert AFI, SAFI to values for packet. */ |
4242 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4243 | |
d62a17ae | 4244 | stream_putw(s, pkt_afi); |
4245 | stream_putc(s, pkt_safi); | |
9cabb64b | 4246 | |
d62a17ae | 4247 | return attrlen_pnt; |
8c71e481 | 4248 | } |
718e3744 | 4249 | |
5f040085 DS |
4250 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4251 | afi_t afi, safi_t safi, | |
4252 | const struct prefix_rd *prd, | |
d7c0a89a QY |
4253 | mpls_label_t *label, uint32_t num_labels, |
4254 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 4255 | struct attr *attr) |
8c71e481 | 4256 | { |
d7c0a89a | 4257 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 4258 | |
b57ba6d2 | 4259 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4260 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4261 | num_labels = 1; |
4262 | } | |
cd1964ff | 4263 | |
d90b788e A |
4264 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
4265 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 4266 | } |
718e3744 | 4267 | |
d62a17ae | 4268 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4269 | { |
d62a17ae | 4270 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4271 | } |
4272 | ||
4273 | /* Initialization of attribute. */ | |
d62a17ae | 4274 | void bgp_attr_init(void) |
718e3744 | 4275 | { |
d62a17ae | 4276 | aspath_init(); |
4277 | attrhash_init(); | |
4278 | community_init(); | |
4279 | ecommunity_init(); | |
4280 | lcommunity_init(); | |
4281 | cluster_init(); | |
4282 | transit_init(); | |
4283 | encap_init(); | |
e496b420 | 4284 | srv6_init(); |
718e3744 | 4285 | } |
4286 | ||
d62a17ae | 4287 | void bgp_attr_finish(void) |
228da428 | 4288 | { |
d62a17ae | 4289 | aspath_finish(); |
4290 | attrhash_finish(); | |
4291 | community_finish(); | |
4292 | ecommunity_finish(); | |
4293 | lcommunity_finish(); | |
4294 | cluster_finish(); | |
4295 | transit_finish(); | |
4296 | encap_finish(); | |
e496b420 | 4297 | srv6_finish(); |
228da428 CC |
4298 | } |
4299 | ||
718e3744 | 4300 | /* Make attribute packet. */ |
d62a17ae | 4301 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
bd494ec5 | 4302 | const struct prefix *prefix) |
d62a17ae | 4303 | { |
4304 | unsigned long cp; | |
4305 | unsigned long len; | |
4306 | size_t aspath_lenp; | |
4307 | struct aspath *aspath; | |
4308 | int addpath_encode = 0; | |
d7c0a89a | 4309 | uint32_t addpath_tx_id = 0; |
d62a17ae | 4310 | |
4311 | /* Remember current pointer. */ | |
4312 | cp = stream_get_endp(s); | |
4313 | ||
4314 | /* Place holder of length. */ | |
4315 | stream_putw(s, 0); | |
4316 | ||
4317 | /* Origin attribute. */ | |
4318 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4319 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4320 | stream_putc(s, 1); | |
4321 | stream_putc(s, attr->origin); | |
4322 | ||
4323 | aspath = attr->aspath; | |
4324 | ||
4325 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4326 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4327 | aspath_lenp = stream_get_endp(s); | |
4328 | stream_putw(s, 0); | |
4329 | ||
4330 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4331 | ||
4332 | /* Nexthop attribute. */ | |
4333 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4334 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4335 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4336 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4337 | stream_putc(s, 4); | |
4338 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4339 | } |
d62a17ae | 4340 | |
4341 | /* MED attribute. */ | |
4342 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4343 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4344 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4345 | stream_putc(s, 4); | |
4346 | stream_putl(s, attr->med); | |
4347 | } | |
4348 | ||
4349 | /* Local preference. */ | |
4350 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4351 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4352 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4353 | stream_putc(s, 4); | |
4354 | stream_putl(s, attr->local_pref); | |
4355 | } | |
4356 | ||
4357 | /* Atomic aggregate. */ | |
4358 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4359 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4360 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4361 | stream_putc(s, 0); | |
4362 | } | |
4363 | ||
4364 | /* Aggregator. */ | |
4365 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4366 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4367 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4368 | stream_putc(s, 8); | |
4369 | stream_putl(s, attr->aggregator_as); | |
4370 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4371 | } | |
4372 | ||
4373 | /* Community attribute. */ | |
4374 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
4375 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4376 | stream_putc(s, |
4377 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4378 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4379 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4380 | stream_putw(s, attr->community->size * 4); | |
4381 | } else { | |
996c9314 LB |
4382 | stream_putc(s, |
4383 | BGP_ATTR_FLAG_OPTIONAL | |
4384 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4385 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4386 | stream_putc(s, attr->community->size * 4); | |
4387 | } | |
4388 | stream_put(s, attr->community->val, attr->community->size * 4); | |
4389 | } | |
4390 | ||
4391 | /* Large Community attribute. */ | |
4392 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 4393 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4394 | stream_putc(s, |
4395 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4396 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4397 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4398 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4399 | } else { |
996c9314 LB |
4400 | stream_putc(s, |
4401 | BGP_ATTR_FLAG_OPTIONAL | |
4402 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4403 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4404 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4405 | } |
4406 | ||
996c9314 LB |
4407 | stream_put(s, attr->lcommunity->val, |
4408 | lcom_length(attr->lcommunity)); | |
d62a17ae | 4409 | } |
4410 | ||
4411 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
4412 | if (prefix != NULL && prefix->family == AF_INET6 | |
4413 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
4414 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
4415 | int sizep; | |
4416 | ||
4417 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4418 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
4419 | sizep = stream_get_endp(s); | |
4420 | ||
4421 | /* MP header */ | |
4422 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
4423 | stream_putw(s, AFI_IP6); /* AFI */ | |
4424 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
4425 | ||
4426 | /* Next hop */ | |
4427 | stream_putc(s, attr->mp_nexthop_len); | |
4428 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
4429 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
4430 | stream_put(s, &attr->mp_nexthop_local, | |
4431 | IPV6_MAX_BYTELEN); | |
4432 | ||
4433 | /* SNPA */ | |
4434 | stream_putc(s, 0); | |
4435 | ||
4436 | /* Prefix */ | |
4437 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
4438 | addpath_tx_id); | |
4439 | ||
4440 | /* Set MP attribute length. */ | |
4441 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
4442 | } | |
4443 | ||
4444 | /* Prefix SID */ | |
4445 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
4446 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4447 | stream_putc(s, |
4448 | BGP_ATTR_FLAG_OPTIONAL | |
4449 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4450 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4451 | stream_putc(s, 10); | |
4452 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4453 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4454 | stream_putc(s, 0); // reserved | |
4455 | stream_putw(s, 0); // flags | |
4456 | stream_putl(s, attr->label_index); | |
4457 | } | |
4458 | } | |
4459 | ||
4460 | /* Return total size of attribute. */ | |
4461 | len = stream_get_endp(s) - cp - 2; | |
4462 | stream_putw_at(s, cp, len); | |
718e3744 | 4463 | } |