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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); | |
9299fd00 RS |
533 | key = jhash_1word(l3vpn->loc_block_len, key); |
534 | key = jhash_1word(l3vpn->loc_node_len, key); | |
535 | key = jhash_1word(l3vpn->func_len, key); | |
536 | key = jhash_1word(l3vpn->arg_len, key); | |
537 | key = jhash_1word(l3vpn->transposition_len, key); | |
538 | key = jhash_1word(l3vpn->transposition_offset, key); | |
e496b420 HS |
539 | return key; |
540 | } | |
541 | ||
542 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
543 | { | |
544 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
545 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
546 | ||
547 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
548 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
9299fd00 RS |
549 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior |
550 | && l3vpn1->loc_block_len == l3vpn2->loc_block_len | |
551 | && l3vpn1->loc_node_len == l3vpn2->loc_node_len | |
552 | && l3vpn1->func_len == l3vpn2->func_len | |
553 | && l3vpn1->arg_len == l3vpn2->arg_len | |
554 | && l3vpn1->transposition_len == l3vpn2->transposition_len | |
555 | && l3vpn1->transposition_offset == l3vpn2->transposition_offset; | |
e496b420 HS |
556 | } |
557 | ||
558 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
559 | const struct bgp_attr_srv6_l3vpn *h2) | |
560 | { | |
561 | if (h1 == h2) | |
562 | return true; | |
563 | else if (h1 == NULL || h2 == NULL) | |
564 | return false; | |
565 | else | |
566 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
567 | } | |
568 | ||
569 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
570 | { | |
571 | const struct bgp_attr_srv6_vpn *vpn = p; | |
572 | uint32_t key = 0; | |
573 | ||
574 | key = jhash(&vpn->sid, 16, key); | |
575 | key = jhash_1word(vpn->sid_flags, key); | |
576 | return key; | |
577 | } | |
578 | ||
579 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
580 | { | |
581 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
582 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
583 | ||
584 | return sid_same(&vpn1->sid, &vpn2->sid) | |
585 | && vpn1->sid_flags == vpn2->sid_flags; | |
586 | } | |
587 | ||
588 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
589 | const struct bgp_attr_srv6_vpn *h2) | |
590 | { | |
591 | if (h1 == h2) | |
592 | return true; | |
593 | else if (h1 == NULL || h2 == NULL) | |
594 | return false; | |
595 | else | |
596 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
597 | } | |
598 | ||
599 | static void srv6_init(void) | |
600 | { | |
601 | srv6_l3vpn_hash = | |
602 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
603 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
604 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
605 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
606 | } | |
607 | ||
608 | static void srv6_finish(void) | |
609 | { | |
610 | hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free); | |
611 | hash_free(srv6_l3vpn_hash); | |
612 | srv6_l3vpn_hash = NULL; | |
613 | hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
614 | hash_free(srv6_vpn_hash); | |
615 | srv6_vpn_hash = NULL; | |
616 | } | |
617 | ||
d8b87afe | 618 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 619 | { |
d62a17ae | 620 | const struct transit *transit = p; |
718e3744 | 621 | |
d62a17ae | 622 | return jhash(transit->val, transit->length, 0); |
718e3744 | 623 | } |
624 | ||
74df8d6d | 625 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 626 | { |
d62a17ae | 627 | const struct transit *transit1 = p1; |
628 | const struct transit *transit2 = p2; | |
923de654 | 629 | |
d62a17ae | 630 | return (transit1->length == transit2->length |
631 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 632 | } |
633 | ||
d62a17ae | 634 | static void transit_init(void) |
718e3744 | 635 | { |
996c9314 | 636 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 637 | "BGP Transit Hash"); |
718e3744 | 638 | } |
228da428 | 639 | |
d62a17ae | 640 | static void transit_finish(void) |
228da428 | 641 | { |
d62a17ae | 642 | hash_clean(transit_hash, (void (*)(void *))transit_free); |
643 | hash_free(transit_hash); | |
644 | transit_hash = NULL; | |
228da428 | 645 | } |
6b0655a2 | 646 | |
718e3744 | 647 | /* Attribute hash routines. */ |
9bddac4b | 648 | static struct hash *attrhash; |
718e3744 | 649 | |
d62a17ae | 650 | unsigned long int attr_count(void) |
cbdfbaa5 | 651 | { |
d62a17ae | 652 | return attrhash->count; |
cbdfbaa5 PJ |
653 | } |
654 | ||
d62a17ae | 655 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 656 | { |
d62a17ae | 657 | return transit_hash->count; |
cbdfbaa5 PJ |
658 | } |
659 | ||
d8b87afe | 660 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 661 | { |
d62a17ae | 662 | const struct attr *attr = (struct attr *)p; |
663 | uint32_t key = 0; | |
c8e7b895 | 664 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 665 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 666 | |
0d0268a6 | 667 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
668 | MIX3(attr->local_pref, attr->aggregator_as, |
669 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
670 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
671 | attr->originator_id.s_addr); | |
672 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 673 | |
674 | if (attr->aspath) | |
675 | MIX(aspath_key_make(attr->aspath)); | |
676 | if (attr->community) | |
677 | MIX(community_hash_make(attr->community)); | |
678 | ||
679 | if (attr->lcommunity) | |
680 | MIX(lcommunity_hash_make(attr->lcommunity)); | |
681 | if (attr->ecommunity) | |
682 | MIX(ecommunity_hash_make(attr->ecommunity)); | |
d04ac434 DS |
683 | if (bgp_attr_get_ipv6_ecommunity(attr)) |
684 | MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr))); | |
779fee93 DS |
685 | if (bgp_attr_get_cluster(attr)) |
686 | MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr))); | |
04fb21e2 DS |
687 | if (bgp_attr_get_transit(attr)) |
688 | MIX(transit_hash_key_make(bgp_attr_get_transit(attr))); | |
d62a17ae | 689 | if (attr->encap_subtlvs) |
690 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
b83127e1 HS |
691 | if (attr->srv6_l3vpn) |
692 | MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn)); | |
693 | if (attr->srv6_vpn) | |
694 | MIX(srv6_vpn_hash_key_make(attr->srv6_vpn)); | |
1e20238a | 695 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
696 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
697 | bgp_attr_get_vnc_subtlvs(attr); | |
698 | if (vnc_subtlvs) | |
699 | MIX(encap_hash_key_make(vnc_subtlvs)); | |
bede7744 | 700 | #endif |
d62a17ae | 701 | MIX(attr->mp_nexthop_len); |
702 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
703 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 704 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 705 | MIX(attr->rmap_table_id); |
0789eb69 KM |
706 | MIX(attr->nh_type); |
707 | MIX(attr->bh_type); | |
d62a17ae | 708 | |
709 | return key; | |
710 | } | |
711 | ||
74df8d6d | 712 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 713 | { |
714 | const struct attr *attr1 = p1; | |
715 | const struct attr *attr2 = p2; | |
716 | ||
717 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
718 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
719 | && attr1->aspath == attr2->aspath | |
720 | && attr1->community == attr2->community && attr1->med == attr2->med | |
721 | && attr1->local_pref == attr2->local_pref | |
722 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
723 | if (attr1->aggregator_as == attr2->aggregator_as | |
724 | && attr1->aggregator_addr.s_addr | |
725 | == attr2->aggregator_addr.s_addr | |
726 | && attr1->weight == attr2->weight | |
727 | && attr1->tag == attr2->tag | |
728 | && attr1->label_index == attr2->label_index | |
729 | && attr1->mp_nexthop_len == attr2->mp_nexthop_len | |
d62a17ae | 730 | && attr1->ecommunity == attr2->ecommunity |
d04ac434 DS |
731 | && bgp_attr_get_ipv6_ecommunity(attr1) |
732 | == bgp_attr_get_ipv6_ecommunity(attr2) | |
d62a17ae | 733 | && attr1->lcommunity == attr2->lcommunity |
779fee93 DS |
734 | && bgp_attr_get_cluster(attr1) |
735 | == bgp_attr_get_cluster(attr2) | |
04fb21e2 DS |
736 | && bgp_attr_get_transit(attr1) |
737 | == bgp_attr_get_transit(attr2) | |
951745bd | 738 | && attr1->rmap_table_id == attr2->rmap_table_id |
d62a17ae | 739 | && (attr1->encap_tunneltype == attr2->encap_tunneltype) |
740 | && encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 741 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
742 | && encap_same(bgp_attr_get_vnc_subtlvs(attr1), |
743 | bgp_attr_get_vnc_subtlvs(attr2)) | |
65efcfce | 744 | #endif |
0d0268a6 LB |
745 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
746 | &attr2->mp_nexthop_global) | |
747 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
748 | &attr2->mp_nexthop_local) | |
749 | && IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
750 | &attr2->mp_nexthop_global_in) | |
d62a17ae | 751 | && IPV4_ADDR_SAME(&attr1->originator_id, |
752 | &attr2->originator_id) | |
77e62f2b | 753 | && overlay_index_same(attr1, attr2) |
0a50c248 | 754 | && !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) |
7904e9fd AK |
755 | && attr1->es_flags == attr2->es_flags |
756 | && attr1->mm_sync_seqnum == attr2->mm_sync_seqnum | |
74e2bd89 AK |
757 | && attr1->df_pref == attr2->df_pref |
758 | && attr1->df_alg == attr2->df_alg | |
77e62f2b | 759 | && attr1->nh_ifindex == attr2->nh_ifindex |
7b7d48e5 | 760 | && attr1->nh_lla_ifindex == attr2->nh_lla_ifindex |
e496b420 HS |
761 | && attr1->distance == attr2->distance |
762 | && srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) | |
ef3e0d04 | 763 | && srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) |
0789eb69 KM |
764 | && attr1->srte_color == attr2->srte_color |
765 | && attr1->nh_type == attr2->nh_type | |
766 | && attr1->bh_type == attr2->bh_type) | |
74df8d6d | 767 | return true; |
d62a17ae | 768 | } |
aadc0905 | 769 | |
74df8d6d | 770 | return false; |
718e3744 | 771 | } |
772 | ||
d62a17ae | 773 | static void attrhash_init(void) |
718e3744 | 774 | { |
996c9314 LB |
775 | attrhash = |
776 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 777 | } |
778 | ||
289d2501 LB |
779 | /* |
780 | * special for hash_clean below | |
781 | */ | |
d62a17ae | 782 | static void attr_vfree(void *attr) |
289d2501 | 783 | { |
d62a17ae | 784 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
785 | } |
786 | ||
d62a17ae | 787 | static void attrhash_finish(void) |
228da428 | 788 | { |
d62a17ae | 789 | hash_clean(attrhash, attr_vfree); |
790 | hash_free(attrhash); | |
791 | attrhash = NULL; | |
228da428 CC |
792 | } |
793 | ||
e3b78da8 | 794 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 795 | { |
e3b78da8 | 796 | struct attr *attr = bucket->data; |
e496b420 | 797 | char sid_str[BUFSIZ]; |
718e3744 | 798 | |
23d0a753 | 799 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 HS |
800 | |
801 | sid_str[0] = '\0'; | |
802 | if (attr->srv6_l3vpn) | |
803 | inet_ntop(AF_INET6, &attr->srv6_l3vpn->sid, sid_str, BUFSIZ); | |
804 | else if (attr->srv6_vpn) | |
805 | inet_ntop(AF_INET6, &attr->srv6_vpn->sid, sid_str, BUFSIZ); | |
806 | ||
807 | vty_out(vty, | |
957f74c3 DS |
808 | "\tflags: %" PRIu64" distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %s\n", |
809 | attr->flag, attr->distance, attr->med, attr->local_pref, | |
810 | attr->origin, attr->weight, attr->label, sid_str); | |
718e3744 | 811 | } |
812 | ||
d62a17ae | 813 | void attr_show_all(struct vty *vty) |
718e3744 | 814 | { |
e3b78da8 | 815 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
816 | void *))attr_show_all_iterator, |
817 | vty); | |
718e3744 | 818 | } |
819 | ||
d62a17ae | 820 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 821 | { |
d62a17ae | 822 | struct attr *val = (struct attr *)p; |
823 | struct attr *attr; | |
718e3744 | 824 | |
d62a17ae | 825 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
826 | *attr = *val; | |
827 | if (val->encap_subtlvs) { | |
828 | val->encap_subtlvs = NULL; | |
829 | } | |
1e20238a | 830 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
831 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
832 | bgp_attr_get_vnc_subtlvs(val); | |
833 | ||
834 | if (vnc_subtlvs) | |
835 | bgp_attr_set_vnc_subtlvs(val, NULL); | |
65efcfce | 836 | #endif |
e496b420 HS |
837 | if (val->srv6_l3vpn) |
838 | val->srv6_l3vpn = NULL; | |
839 | if (val->srv6_vpn) | |
840 | val->srv6_vpn = NULL; | |
841 | ||
d62a17ae | 842 | attr->refcnt = 0; |
843 | return attr; | |
718e3744 | 844 | } |
845 | ||
846 | /* Internet argument attribute. */ | |
d62a17ae | 847 | struct attr *bgp_attr_intern(struct attr *attr) |
848 | { | |
849 | struct attr *find; | |
d04ac434 | 850 | struct ecommunity *ecomm; |
d62a17ae | 851 | |
852 | /* Intern referenced strucutre. */ | |
853 | if (attr->aspath) { | |
854 | if (!attr->aspath->refcnt) | |
855 | attr->aspath = aspath_intern(attr->aspath); | |
856 | else | |
857 | attr->aspath->refcnt++; | |
858 | } | |
859 | if (attr->community) { | |
860 | if (!attr->community->refcnt) | |
861 | attr->community = community_intern(attr->community); | |
862 | else | |
863 | attr->community->refcnt++; | |
864 | } | |
865 | ||
866 | if (attr->ecommunity) { | |
867 | if (!attr->ecommunity->refcnt) | |
868 | attr->ecommunity = ecommunity_intern(attr->ecommunity); | |
869 | else | |
870 | attr->ecommunity->refcnt++; | |
871 | } | |
9a659715 | 872 | |
d04ac434 DS |
873 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
874 | if (ecomm) { | |
875 | if (!ecomm->refcnt) | |
876 | bgp_attr_set_ipv6_ecommunity(attr, | |
877 | ecommunity_intern(ecomm)); | |
9a659715 | 878 | else |
d04ac434 | 879 | ecomm->refcnt++; |
9a659715 PG |
880 | } |
881 | ||
d62a17ae | 882 | if (attr->lcommunity) { |
883 | if (!attr->lcommunity->refcnt) | |
884 | attr->lcommunity = lcommunity_intern(attr->lcommunity); | |
885 | else | |
886 | attr->lcommunity->refcnt++; | |
887 | } | |
779fee93 DS |
888 | |
889 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); | |
890 | ||
891 | if (cluster) { | |
892 | if (!cluster->refcnt) | |
893 | bgp_attr_set_cluster(attr, cluster_intern(cluster)); | |
d62a17ae | 894 | else |
779fee93 | 895 | cluster->refcnt++; |
d62a17ae | 896 | } |
04fb21e2 DS |
897 | |
898 | struct transit *transit = bgp_attr_get_transit(attr); | |
899 | ||
900 | if (transit) { | |
901 | if (!transit->refcnt) | |
902 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
d62a17ae | 903 | else |
04fb21e2 | 904 | transit->refcnt++; |
d62a17ae | 905 | } |
906 | if (attr->encap_subtlvs) { | |
907 | if (!attr->encap_subtlvs->refcnt) | |
908 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
909 | ENCAP_SUBTLV_TYPE); | |
910 | else | |
911 | attr->encap_subtlvs->refcnt++; | |
912 | } | |
e496b420 HS |
913 | if (attr->srv6_l3vpn) { |
914 | if (!attr->srv6_l3vpn->refcnt) | |
915 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
916 | else | |
917 | attr->srv6_l3vpn->refcnt++; | |
918 | } | |
919 | if (attr->srv6_vpn) { | |
920 | if (!attr->srv6_vpn->refcnt) | |
921 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
922 | else | |
923 | attr->srv6_vpn->refcnt++; | |
924 | } | |
1e20238a | 925 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
926 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
927 | bgp_attr_get_vnc_subtlvs(attr); | |
928 | ||
929 | if (vnc_subtlvs) { | |
930 | if (!vnc_subtlvs->refcnt) | |
931 | bgp_attr_set_vnc_subtlvs( | |
932 | attr, | |
933 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
d62a17ae | 934 | else |
91ebf12c | 935 | vnc_subtlvs->refcnt++; |
d62a17ae | 936 | } |
aadc0905 | 937 | #endif |
bede7744 | 938 | |
dbbac180 DL |
939 | /* At this point, attr only contains intern'd pointers. that means |
940 | * if we find it in attrhash, it has all the same pointers and we | |
941 | * correctly updated the refcounts on these. | |
942 | * If we don't find it, we need to allocate a one because in all | |
943 | * cases this returns a new reference to a hashed attr, but the input | |
944 | * wasn't on hash. */ | |
d62a17ae | 945 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
946 | find->refcnt++; | |
947 | ||
948 | return find; | |
718e3744 | 949 | } |
950 | ||
951 | /* Make network statement's attribute. */ | |
d7c0a89a | 952 | struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin) |
718e3744 | 953 | { |
d62a17ae | 954 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 955 | |
d62a17ae | 956 | attr->origin = origin; |
957 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
958 | attr->aspath = aspath_empty(); | |
959 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
960 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
961 | attr->tag = 0; | |
962 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
963 | attr->label = MPLS_INVALID_LABEL; | |
964 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
965 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
966 | ||
967 | return attr; | |
718e3744 | 968 | } |
969 | ||
b5d58c32 | 970 | /* Create the attributes for an aggregate */ |
5f040085 DS |
971 | struct attr *bgp_attr_aggregate_intern( |
972 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
973 | struct community *community, struct ecommunity *ecommunity, | |
974 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
975 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 976 | { |
977 | struct attr attr; | |
978 | struct attr *new; | |
20894f50 | 979 | int ret; |
d62a17ae | 980 | |
981 | memset(&attr, 0, sizeof(struct attr)); | |
982 | ||
983 | /* Origin attribute. */ | |
984 | attr.origin = origin; | |
985 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
986 | ||
987 | /* AS path attribute. */ | |
988 | if (aspath) | |
989 | attr.aspath = aspath_intern(aspath); | |
990 | else | |
991 | attr.aspath = aspath_empty(); | |
992 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
993 | ||
994 | /* Next hop attribute. */ | |
995 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
996 | ||
997 | if (community) { | |
d7c0a89a | 998 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
999 | |
1000 | /* If we are not shutting down ourselves and we are | |
1001 | * aggregating a route that contains the GSHUT community we | |
1002 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 1003 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 1004 | && community_include(community, gshut)) { |
7f323236 DW |
1005 | community_del_val(community, &gshut); |
1006 | } | |
1007 | ||
d62a17ae | 1008 | attr.community = community; |
1009 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1010 | } | |
1011 | ||
3da2cc32 DS |
1012 | if (ecommunity) { |
1013 | attr.ecommunity = ecommunity; | |
1014 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
1015 | } | |
1016 | ||
dd18c5a9 DS |
1017 | if (lcommunity) { |
1018 | attr.lcommunity = lcommunity; | |
1019 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); | |
1020 | } | |
1021 | ||
637e5ba4 | 1022 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 1023 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 1024 | |
d62a17ae | 1025 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
1026 | attr.label = MPLS_INVALID_LABEL; | |
1027 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1028 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 1029 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 1030 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
1031 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1032 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1033 | attr.aggregator_as = bgp->confed_id; | |
1034 | else | |
1035 | attr.aggregator_as = bgp->as; | |
1036 | attr.aggregator_addr = bgp->router_id; | |
1037 | attr.label_index = BGP_INVALID_LABEL_INDEX; | |
1038 | attr.label = MPLS_INVALID_LABEL; | |
1039 | ||
20894f50 DA |
1040 | /* Apply route-map */ |
1041 | if (aggregate->rmap.name) { | |
1042 | struct attr attr_tmp = attr; | |
1043 | struct bgp_path_info rmap_path; | |
1044 | ||
1045 | memset(&rmap_path, 0, sizeof(struct bgp_path_info)); | |
1046 | rmap_path.peer = bgp->peer_self; | |
1047 | rmap_path.attr = &attr_tmp; | |
1048 | ||
1049 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1050 | ||
1782514f | 1051 | ret = route_map_apply(aggregate->rmap.map, p, &rmap_path); |
20894f50 DA |
1052 | |
1053 | bgp->peer_self->rmap_type = 0; | |
1054 | ||
1055 | if (ret == RMAP_DENYMATCH) { | |
1056 | /* Free uninterned attribute. */ | |
1057 | bgp_attr_flush(&attr_tmp); | |
1058 | ||
1059 | /* Unintern original. */ | |
1060 | aspath_unintern(&attr.aspath); | |
1061 | return NULL; | |
1062 | } | |
1063 | ||
637e5ba4 | 1064 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1065 | bgp_attr_add_gshut_community(&attr_tmp); |
1066 | ||
1067 | new = bgp_attr_intern(&attr_tmp); | |
1068 | } else { | |
1069 | ||
637e5ba4 | 1070 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1071 | bgp_attr_add_gshut_community(&attr); |
1072 | ||
1073 | new = bgp_attr_intern(&attr); | |
1074 | } | |
d62a17ae | 1075 | |
1076 | aspath_unintern(&new->aspath); | |
1077 | return new; | |
718e3744 | 1078 | } |
1079 | ||
b881c707 | 1080 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1081 | void bgp_attr_unintern_sub(struct attr *attr) |
1082 | { | |
d04ac434 | 1083 | struct ecommunity *ecomm; |
779fee93 | 1084 | struct cluster_list *cluster; |
d04ac434 | 1085 | |
d62a17ae | 1086 | /* aspath refcount shoud be decrement. */ |
1087 | if (attr->aspath) | |
1088 | aspath_unintern(&attr->aspath); | |
1089 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); | |
1090 | ||
1091 | if (attr->community) | |
1092 | community_unintern(&attr->community); | |
1093 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)); | |
1094 | ||
df7d4670 | 1095 | ecommunity_unintern(&attr->ecommunity); |
d62a17ae | 1096 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)); |
1097 | ||
d04ac434 DS |
1098 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1099 | ecommunity_unintern(&ecomm); | |
9a659715 | 1100 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES)); |
d04ac434 | 1101 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a659715 | 1102 | |
d62a17ae | 1103 | if (attr->lcommunity) |
1104 | lcommunity_unintern(&attr->lcommunity); | |
1105 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)); | |
1106 | ||
779fee93 DS |
1107 | cluster = bgp_attr_get_cluster(attr); |
1108 | if (cluster) { | |
1109 | cluster_unintern(&cluster); | |
1110 | bgp_attr_set_cluster(attr, cluster); | |
1111 | } | |
d62a17ae | 1112 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1113 | ||
04fb21e2 DS |
1114 | struct transit *transit = bgp_attr_get_transit(attr); |
1115 | ||
1116 | if (transit) { | |
1117 | transit_unintern(&transit); | |
1118 | bgp_attr_set_transit(attr, transit); | |
1119 | } | |
d62a17ae | 1120 | |
1121 | if (attr->encap_subtlvs) | |
1122 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1123 | |
1e20238a | 1124 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1125 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1126 | bgp_attr_get_vnc_subtlvs(attr); | |
1127 | ||
1128 | if (vnc_subtlvs) { | |
1129 | encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1130 | bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs); | |
1131 | } | |
bede7744 | 1132 | #endif |
e496b420 HS |
1133 | |
1134 | if (attr->srv6_l3vpn) | |
1135 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1136 | ||
1137 | if (attr->srv6_vpn) | |
1138 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1139 | } |
1140 | ||
f46d8e1e DS |
1141 | /* |
1142 | * We have some show commands that let you experimentally | |
1143 | * apply a route-map. When we apply the route-map | |
1144 | * we are reseting values but not saving them for | |
1145 | * posterity via intern'ing( because route-maps don't | |
1146 | * do that) but at this point in time we need | |
1147 | * to compare the new attr to the old and if the | |
1148 | * routemap has changed it we need to, as Snoop Dog says, | |
1149 | * Drop it like it's hot | |
1150 | */ | |
1151 | void bgp_attr_undup(struct attr *new, struct attr *old) | |
1152 | { | |
1153 | if (new->aspath != old->aspath) | |
1154 | aspath_free(new->aspath); | |
1155 | ||
1156 | if (new->community != old->community) | |
3c1f53de | 1157 | community_free(&new->community); |
f46d8e1e DS |
1158 | |
1159 | if (new->ecommunity != old->ecommunity) | |
1160 | ecommunity_free(&new->ecommunity); | |
1161 | ||
1162 | if (new->lcommunity != old->lcommunity) | |
1163 | lcommunity_free(&new->lcommunity); | |
b83127e1 HS |
1164 | |
1165 | if (new->srv6_l3vpn != old->srv6_l3vpn) { | |
1166 | srv6_l3vpn_free(new->srv6_l3vpn); | |
1167 | new->srv6_l3vpn = NULL; | |
1168 | } | |
1169 | ||
1170 | if (new->srv6_vpn != old->srv6_vpn) { | |
1171 | srv6_vpn_free(new->srv6_vpn); | |
1172 | new->srv6_vpn = NULL; | |
1173 | } | |
f46d8e1e DS |
1174 | } |
1175 | ||
718e3744 | 1176 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1177 | void bgp_attr_unintern(struct attr **pattr) |
1178 | { | |
1179 | struct attr *attr = *pattr; | |
1180 | struct attr *ret; | |
1181 | struct attr tmp; | |
1182 | ||
1183 | /* Decrement attribute reference. */ | |
1184 | attr->refcnt--; | |
1185 | ||
1186 | tmp = *attr; | |
1187 | ||
1188 | /* If reference becomes zero then free attribute object. */ | |
1189 | if (attr->refcnt == 0) { | |
1190 | ret = hash_release(attrhash, attr); | |
1191 | assert(ret != NULL); | |
1192 | XFREE(MTYPE_ATTR, attr); | |
1193 | *pattr = NULL; | |
1194 | } | |
1195 | ||
1196 | bgp_attr_unintern_sub(&tmp); | |
1197 | } | |
1198 | ||
1199 | void bgp_attr_flush(struct attr *attr) | |
1200 | { | |
d04ac434 | 1201 | struct ecommunity *ecomm; |
779fee93 | 1202 | struct cluster_list *cluster; |
d04ac434 | 1203 | |
d62a17ae | 1204 | if (attr->aspath && !attr->aspath->refcnt) { |
1205 | aspath_free(attr->aspath); | |
1206 | attr->aspath = NULL; | |
1207 | } | |
3c1f53de SMS |
1208 | if (attr->community && !attr->community->refcnt) |
1209 | community_free(&attr->community); | |
d62a17ae | 1210 | if (attr->ecommunity && !attr->ecommunity->refcnt) |
1211 | ecommunity_free(&attr->ecommunity); | |
d04ac434 DS |
1212 | ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1213 | if (ecomm && !ecomm->refcnt) | |
1214 | ecommunity_free(&ecomm); | |
1215 | bgp_attr_set_ipv6_ecommunity(attr, NULL); | |
d62a17ae | 1216 | if (attr->lcommunity && !attr->lcommunity->refcnt) |
1217 | lcommunity_free(&attr->lcommunity); | |
779fee93 DS |
1218 | |
1219 | cluster = bgp_attr_get_cluster(attr); | |
1220 | if (cluster && !cluster->refcnt) { | |
1221 | cluster_free(cluster); | |
1222 | bgp_attr_set_cluster(attr, NULL); | |
d62a17ae | 1223 | } |
04fb21e2 DS |
1224 | |
1225 | struct transit *transit = bgp_attr_get_transit(attr); | |
1226 | ||
1227 | if (transit && !transit->refcnt) { | |
1228 | transit_free(transit); | |
1229 | bgp_attr_set_transit(attr, NULL); | |
d62a17ae | 1230 | } |
1231 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1232 | encap_free(attr->encap_subtlvs); | |
1233 | attr->encap_subtlvs = NULL; | |
1234 | } | |
b83127e1 HS |
1235 | if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) { |
1236 | srv6_l3vpn_free(attr->srv6_l3vpn); | |
1237 | attr->srv6_l3vpn = NULL; | |
1238 | } | |
1239 | if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) { | |
1240 | srv6_vpn_free(attr->srv6_vpn); | |
1241 | attr->srv6_vpn = NULL; | |
1242 | } | |
1e20238a | 1243 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1244 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1245 | bgp_attr_get_vnc_subtlvs(attr); | |
1246 | ||
1247 | if (vnc_subtlvs && !vnc_subtlvs->refcnt) { | |
1248 | encap_free(vnc_subtlvs); | |
1249 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 1250 | } |
aadc0905 | 1251 | #endif |
718e3744 | 1252 | } |
1253 | ||
b881c707 PJ |
1254 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1255 | * avoid resetting sessions for malformed attributes which are | |
1256 | * are partial/optional and hence where the error likely was not | |
1257 | * introduced by the sending neighbour. | |
1258 | */ | |
1259 | static bgp_attr_parse_ret_t | |
d7c0a89a | 1260 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1261 | bgp_size_t length) |
1262 | { | |
1263 | struct peer *const peer = args->peer; | |
599f7b33 | 1264 | struct attr *const attr = args->attr; |
d7c0a89a | 1265 | const uint8_t flags = args->flags; |
d62a17ae | 1266 | /* startp and length must be special-cased, as whether or not to |
1267 | * send the attribute data with the NOTIFY depends on the error, | |
1268 | * the caller therefore signals this with the seperate length argument | |
1269 | */ | |
d7c0a89a | 1270 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1271 | |
599f7b33 DA |
1272 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1273 | char attr_str[BUFSIZ] = {0}; | |
1274 | ||
99ab4d23 | 1275 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1276 | |
1277 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1278 | } | |
1279 | ||
d62a17ae | 1280 | /* Only relax error handling for eBGP peers */ |
1281 | if (peer->sort != BGP_PEER_EBGP) { | |
1282 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1283 | notify_datap, length); | |
1284 | return BGP_ATTR_PARSE_ERROR; | |
1285 | } | |
1286 | ||
1287 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1288 | * still proceed but the caller hasn't read all the attribute. | |
1289 | */ | |
1290 | stream_set_getp(BGP_INPUT(peer), | |
1291 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1292 | + args->total); | |
1293 | ||
1294 | switch (args->type) { | |
1295 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1296 | * affect route selection, and can be safely ignored, then any such | |
1297 | * attributes which are malformed should just be ignored and the route | |
1298 | * processed as normal. | |
1299 | */ | |
1300 | case BGP_ATTR_AS4_AGGREGATOR: | |
1301 | case BGP_ATTR_AGGREGATOR: | |
1302 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1303 | return BGP_ATTR_PARSE_PROCEED; | |
1304 | ||
1305 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1306 | * selection, should be treat-as-withdraw. |
d62a17ae | 1307 | */ |
1308 | case BGP_ATTR_ORIGIN: | |
1309 | case BGP_ATTR_AS_PATH: | |
1310 | case BGP_ATTR_NEXT_HOP: | |
1311 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1312 | case BGP_ATTR_LOCAL_PREF: | |
1313 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1314 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1315 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1316 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1317 | case BGP_ATTR_ORIGINATOR_ID: |
1318 | case BGP_ATTR_CLUSTER_LIST: | |
4ba5a9c5 | 1319 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1320 | case BGP_ATTR_MP_REACH_NLRI: |
1321 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1322 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1323 | notify_datap, length); | |
1324 | return BGP_ATTR_PARSE_ERROR; | |
1325 | } | |
1326 | ||
1327 | /* Partial optional attributes that are malformed should not cause | |
1328 | * the whole session to be reset. Instead treat it as a withdrawal | |
1329 | * of the routes, if possible. | |
1330 | */ | |
1331 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1332 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1333 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1334 | return BGP_ATTR_PARSE_WITHDRAW; | |
1335 | ||
1336 | /* default to reset */ | |
1337 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1338 | } |
1339 | ||
afcb7679 DO |
1340 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1341 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1342 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1343 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1344 | non-transitive" attribute. */ | |
1345 | static void | |
d62a17ae | 1346 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1347 | uint8_t desired_flags /* how RFC says it must be */ |
1348 | ) | |
d62a17ae | 1349 | { |
d7c0a89a QY |
1350 | uint8_t seen = 0, i; |
1351 | uint8_t real_flags = args->flags; | |
1352 | const uint8_t attr_code = args->type; | |
d62a17ae | 1353 | |
1354 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1355 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1356 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1357 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1358 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1359 | flog_err(EC_BGP_ATTR_FLAG, |
1360 | "%s attribute must%s be flagged as \"%s\"", | |
1361 | lookup_msg(attr_str, attr_code, NULL), | |
1362 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1363 | ? "" | |
1364 | : " not", | |
1365 | attr_flag_str[i].str); | |
d62a17ae | 1366 | seen = 1; |
1367 | } | |
1368 | if (!seen) { | |
1369 | zlog_debug( | |
3efd0893 | 1370 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1371 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1372 | real_flags, desired_flags); | |
1373 | } | |
afcb7679 DO |
1374 | } |
1375 | ||
3ecab4c8 PJ |
1376 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1377 | * as will PARTIAL for optional+transitive attributes. | |
1378 | */ | |
d7c0a89a QY |
1379 | const uint8_t attr_flags_values[] = { |
1380 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1381 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1382 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1383 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1384 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1385 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1386 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1387 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1388 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1389 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1390 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1391 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1392 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1393 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1394 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1395 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1396 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1397 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1398 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1399 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1400 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
9a659715 PG |
1401 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1402 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
3ecab4c8 | 1403 | }; |
099111ef | 1404 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1405 | |
3dc339cd | 1406 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1407 | { |
d7c0a89a QY |
1408 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1409 | const uint8_t flags = args->flags; | |
1410 | const uint8_t attr_code = args->type; | |
d62a17ae | 1411 | |
1412 | /* there may be attributes we don't know about */ | |
1413 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1414 | return false; |
d62a17ae | 1415 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1416 | return false; |
d62a17ae | 1417 | |
1418 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1419 | * to | |
1420 | * 1." | |
1421 | */ | |
1422 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1423 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1424 | flog_err( |
e50f7cfd | 1425 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1426 | "%s well-known attributes must have transitive flag set (%x)", |
1427 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1428 | return true; |
d62a17ae | 1429 | } |
1430 | ||
1431 | /* "For well-known attributes and for optional non-transitive | |
1432 | * attributes, | |
1433 | * the Partial bit MUST be set to 0." | |
1434 | */ | |
1435 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1436 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1437 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1438 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1439 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1440 | return true; |
d62a17ae | 1441 | } |
1442 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1443 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1444 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1445 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1446 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1447 | return true; |
d62a17ae | 1448 | } |
1449 | } | |
1450 | ||
1451 | /* Optional transitive attributes may go through speakers that don't | |
1452 | * reocgnise them and set the Partial bit. | |
1453 | */ | |
1454 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1455 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1456 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1457 | ||
1458 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1459 | return false; |
d62a17ae | 1460 | |
1461 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1462 | return true; |
3ecab4c8 PJ |
1463 | } |
1464 | ||
718e3744 | 1465 | /* Get origin attribute of the update message. */ |
d62a17ae | 1466 | static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args) |
1467 | { | |
1468 | struct peer *const peer = args->peer; | |
1469 | struct attr *const attr = args->attr; | |
1470 | const bgp_size_t length = args->length; | |
1471 | ||
1472 | /* If any recognized attribute has Attribute Length that conflicts | |
1473 | with the expected length (based on the attribute type code), then | |
1474 | the Error Subcode is set to Attribute Length Error. The Data | |
1475 | field contains the erroneous attribute (type, length and | |
1476 | value). */ | |
1477 | if (length != 1) { | |
e50f7cfd | 1478 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1479 | "Origin attribute length is not one %d", length); |
d62a17ae | 1480 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1481 | args->total); | |
1482 | } | |
1483 | ||
1484 | /* Fetch origin attribute. */ | |
1485 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1486 | ||
1487 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1488 | Subcode is set to Invalid Origin Attribute. The Data field | |
1489 | contains the unrecognized attribute (type, length and value). */ | |
1490 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1491 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1492 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1493 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1494 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1495 | args->total); | |
1496 | } | |
1497 | ||
1498 | /* Set oring attribute flag. */ | |
1499 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1500 | ||
1501 | return 0; | |
718e3744 | 1502 | } |
ab005298 PJ |
1503 | |
1504 | /* Parse AS path information. This function is wrapper of | |
1505 | aspath_parse. */ | |
d62a17ae | 1506 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1507 | { | |
1508 | struct attr *const attr = args->attr; | |
1509 | struct peer *const peer = args->peer; | |
1510 | const bgp_size_t length = args->length; | |
1511 | ||
1512 | /* | |
1513 | * peer with AS4 => will get 4Byte ASnums | |
1514 | * otherwise, will get 16 Bit | |
1515 | */ | |
8cff42ad DA |
1516 | attr->aspath = aspath_parse( |
1517 | peer->curr, length, | |
1518 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) | |
1519 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)); | |
d62a17ae | 1520 | |
1521 | /* In case of IBGP, length will be zero. */ | |
1522 | if (!attr->aspath) { | |
e50f7cfd | 1523 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1524 | "Malformed AS path from %s, length is %d", peer->host, |
1525 | length); | |
d62a17ae | 1526 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1527 | 0); | |
1528 | } | |
0b2aa3a0 | 1529 | |
d62a17ae | 1530 | /* Set aspath attribute flag. */ |
1531 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1532 | ||
1533 | return BGP_ATTR_PARSE_PROCEED; | |
1534 | } | |
1535 | ||
1536 | static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer, | |
1537 | struct attr *const attr) | |
1538 | { | |
1539 | /* These checks were part of bgp_attr_aspath, but with | |
1540 | * as4 we should to check aspath things when | |
1541 | * aspath synthesizing with as4_path has already taken place. | |
1542 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1543 | * not right. | |
1544 | * So do the checks later, i.e. here | |
1545 | */ | |
d62a17ae | 1546 | struct aspath *aspath; |
1547 | ||
1548 | /* Confederation sanity check. */ | |
1549 | if ((peer->sort == BGP_PEER_CONFED | |
1550 | && !aspath_left_confed_check(attr->aspath)) | |
1551 | || (peer->sort == BGP_PEER_EBGP | |
1552 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1553 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1554 | peer->host); |
4ba5a9c5 | 1555 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1556 | } |
cddb8112 | 1557 | |
d62a17ae | 1558 | /* First AS check for EBGP. */ |
47cbc09b | 1559 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1560 | if (peer->sort == BGP_PEER_EBGP |
1561 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1562 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1563 | "%s incorrect first AS (must be %u)", |
1564 | peer->host, peer->as); | |
4ba5a9c5 | 1565 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1566 | } |
1567 | } | |
0b2aa3a0 | 1568 | |
88cc0ce4 DA |
1569 | /* Codification of AS 0 Processing */ |
1570 | if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) { | |
1571 | flog_err( | |
1572 | EC_BGP_ATTR_MAL_AS_PATH, | |
1573 | "Malformed AS path, AS number is 0 in the path from %s", | |
1574 | peer->host); | |
1575 | return BGP_ATTR_PARSE_WITHDRAW; | |
1576 | } | |
1577 | ||
d62a17ae | 1578 | /* local-as prepend */ |
1579 | if (peer->change_local_as | |
1580 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1581 | aspath = aspath_dup(attr->aspath); | |
1582 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1583 | aspath_unintern(&attr->aspath); | |
1584 | attr->aspath = aspath_intern(aspath); | |
1585 | } | |
0b2aa3a0 | 1586 | |
d62a17ae | 1587 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1588 | } |
1589 | ||
ab005298 PJ |
1590 | /* Parse AS4 path information. This function is another wrapper of |
1591 | aspath_parse. */ | |
d62a17ae | 1592 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1593 | struct aspath **as4_path) | |
ab005298 | 1594 | { |
d62a17ae | 1595 | struct peer *const peer = args->peer; |
1596 | struct attr *const attr = args->attr; | |
1597 | const bgp_size_t length = args->length; | |
ab005298 | 1598 | |
424ab01d | 1599 | *as4_path = aspath_parse(peer->curr, length, 1); |
b881c707 | 1600 | |
d62a17ae | 1601 | /* In case of IBGP, length will be zero. */ |
1602 | if (!*as4_path) { | |
e50f7cfd | 1603 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1604 | "Malformed AS4 path from %s, length is %d", peer->host, |
1605 | length); | |
d62a17ae | 1606 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1607 | 0); | |
1608 | } | |
ab005298 | 1609 | |
d62a17ae | 1610 | /* Set aspath attribute flag. */ |
1611 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1612 | ||
1613 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1614 | } |
1615 | ||
9738e9aa | 1616 | /* |
1617 | * Check that the nexthop attribute is valid. | |
1618 | */ | |
1619 | bgp_attr_parse_ret_t | |
1620 | bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr) | |
1621 | { | |
1622 | in_addr_t nexthop_h; | |
1623 | ||
1624 | nexthop_h = ntohl(attr->nexthop.s_addr); | |
1625 | if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h) | |
1626 | || IPV4_CLASS_DE(nexthop_h)) | |
1627 | && !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) { | |
7decb30c | 1628 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1629 | char buf[INET_ADDRSTRLEN]; |
1630 | ||
1631 | inet_ntop(AF_INET, &attr->nexthop.s_addr, buf, | |
1632 | INET_ADDRSTRLEN); | |
1633 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s", | |
1634 | buf); | |
7decb30c DS |
1635 | data[0] = BGP_ATTR_FLAG_TRANS; |
1636 | data[1] = BGP_ATTR_NEXT_HOP; | |
1637 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1638 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1639 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1640 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1641 | data, 7); | |
9738e9aa | 1642 | return BGP_ATTR_PARSE_ERROR; |
1643 | } | |
1644 | ||
1645 | return BGP_ATTR_PARSE_PROCEED; | |
1646 | } | |
1647 | ||
718e3744 | 1648 | /* Nexthop attribute. */ |
d62a17ae | 1649 | static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args) |
1650 | { | |
1651 | struct peer *const peer = args->peer; | |
1652 | struct attr *const attr = args->attr; | |
1653 | const bgp_size_t length = args->length; | |
1654 | ||
d62a17ae | 1655 | /* Check nexthop attribute length. */ |
1656 | if (length != 4) { | |
e50f7cfd | 1657 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1658 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1659 | |
1660 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1661 | args->total); | |
1662 | } | |
1663 | ||
88f33d66 | 1664 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1665 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1666 | ||
1667 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1668 | } |
1669 | ||
1670 | /* MED atrribute. */ | |
d62a17ae | 1671 | static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1672 | { |
d62a17ae | 1673 | struct peer *const peer = args->peer; |
1674 | struct attr *const attr = args->attr; | |
1675 | const bgp_size_t length = args->length; | |
b881c707 | 1676 | |
d62a17ae | 1677 | /* Length check. */ |
1678 | if (length != 4) { | |
e50f7cfd | 1679 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1680 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1681 | |
d62a17ae | 1682 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1683 | args->total); | |
1684 | } | |
1685 | ||
424ab01d | 1686 | attr->med = stream_getl(peer->curr); |
718e3744 | 1687 | |
d62a17ae | 1688 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1689 | |
d62a17ae | 1690 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1691 | } |
1692 | ||
1693 | /* Local preference attribute. */ | |
b881c707 | 1694 | static bgp_attr_parse_ret_t |
d62a17ae | 1695 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1696 | { | |
1697 | struct peer *const peer = args->peer; | |
1698 | struct attr *const attr = args->attr; | |
1699 | const bgp_size_t length = args->length; | |
1700 | ||
4ba5a9c5 DA |
1701 | /* if received from an internal neighbor, it SHALL be considered |
1702 | * malformed if its length is not equal to 4. If malformed, the | |
1703 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1704 | * withdraw". | |
1705 | */ | |
1706 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1707 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1708 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1709 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1710 | args->total); | |
1711 | } | |
1712 | ||
1713 | /* If it is contained in an UPDATE message that is received from an | |
1714 | external peer, then this attribute MUST be ignored by the | |
1715 | receiving speaker. */ | |
1716 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1717 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1718 | return BGP_ATTR_PARSE_PROCEED; |
1719 | } | |
1720 | ||
ad61f778 | 1721 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1722 | |
7f323236 | 1723 | /* Set the local-pref flag. */ |
d62a17ae | 1724 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1725 | ||
1726 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1727 | |
1728 | stream_failure: | |
1729 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1730 | args->total); | |
718e3744 | 1731 | } |
1732 | ||
1733 | /* Atomic aggregate. */ | |
d62a17ae | 1734 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1735 | { |
d62a17ae | 1736 | struct attr *const attr = args->attr; |
1737 | const bgp_size_t length = args->length; | |
1738 | ||
1739 | /* Length check. */ | |
1740 | if (length != 0) { | |
e50f7cfd | 1741 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1742 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1743 | length); | |
d62a17ae | 1744 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1745 | args->total); | |
1746 | } | |
718e3744 | 1747 | |
d62a17ae | 1748 | /* Set atomic aggregate flag. */ |
1749 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1750 | |
d62a17ae | 1751 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1752 | } |
1753 | ||
1754 | /* Aggregator attribute */ | |
d62a17ae | 1755 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1756 | { | |
1757 | struct peer *const peer = args->peer; | |
1758 | struct attr *const attr = args->attr; | |
1759 | const bgp_size_t length = args->length; | |
33d022bc | 1760 | as_t aggregator_as; |
d62a17ae | 1761 | |
1762 | int wantedlen = 6; | |
1763 | ||
1764 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1765 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1766 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1767 | wantedlen = 8; |
1768 | ||
1769 | if (length != wantedlen) { | |
e50f7cfd | 1770 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1771 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1772 | length); | |
d62a17ae | 1773 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1774 | args->total); | |
1775 | } | |
1776 | ||
1777 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) | |
33d022bc | 1778 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1779 | else |
33d022bc DA |
1780 | aggregator_as = stream_getw(peer->curr); |
1781 | ||
e8364238 DA |
1782 | attr->aggregator_as = aggregator_as; |
1783 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1784 | ||
33d022bc | 1785 | /* Codification of AS 0 Processing */ |
4877b70b | 1786 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1787 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1788 | "%s: AGGREGATOR AS number is 0 for aspath: %s", |
1789 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1790 | |
1791 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1792 | char attr_str[BUFSIZ] = {0}; | |
1793 | ||
1794 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1795 | ||
1796 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1797 | } | |
1798 | } else { | |
8085c9a7 | 1799 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); |
4877b70b | 1800 | } |
33d022bc | 1801 | |
d62a17ae | 1802 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1803 | } |
1804 | ||
0b2aa3a0 | 1805 | /* New Aggregator attribute */ |
b881c707 | 1806 | static bgp_attr_parse_ret_t |
d62a17ae | 1807 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1808 | as_t *as4_aggregator_as, | |
1809 | struct in_addr *as4_aggregator_addr) | |
1810 | { | |
1811 | struct peer *const peer = args->peer; | |
1812 | struct attr *const attr = args->attr; | |
1813 | const bgp_size_t length = args->length; | |
33d022bc | 1814 | as_t aggregator_as; |
d62a17ae | 1815 | |
1816 | if (length != 8) { | |
1c50c1c0 QY |
1817 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1818 | length); | |
d62a17ae | 1819 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1820 | 0); | |
1821 | } | |
1822 | ||
33d022bc | 1823 | aggregator_as = stream_getl(peer->curr); |
0f2a703d | 1824 | |
e8364238 DA |
1825 | *as4_aggregator_as = aggregator_as; |
1826 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1827 | ||
0f2a703d | 1828 | /* Codification of AS 0 Processing */ |
4877b70b | 1829 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1830 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1831 | "%s: AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1832 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1833 | |
1834 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1835 | char attr_str[BUFSIZ] = {0}; | |
1836 | ||
1837 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1838 | ||
1839 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1840 | } | |
1841 | } else { | |
8085c9a7 | 1842 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); |
4877b70b | 1843 | } |
33d022bc | 1844 | |
d62a17ae | 1845 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1846 | } |
1847 | ||
1848 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1849 | */ | |
b881c707 | 1850 | static bgp_attr_parse_ret_t |
d62a17ae | 1851 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1852 | struct aspath *as4_path, as_t as4_aggregator, | |
1853 | struct in_addr *as4_aggregator_addr) | |
1854 | { | |
1855 | int ignore_as4_path = 0; | |
1856 | struct aspath *newpath; | |
1857 | ||
1858 | if (!attr->aspath) { | |
1859 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1860 | * have | |
1861 | * checked that all well-known, mandatory attributes were | |
1862 | * present. | |
1863 | * | |
1864 | * Can only be a problem with peer itself - hard error | |
1865 | */ | |
1866 | return BGP_ATTR_PARSE_ERROR; | |
1867 | } | |
1868 | ||
1869 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
1870 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
1871 | * if given. | |
1872 | * It is worth a warning though, because the peer really | |
1873 | * should not send them | |
1874 | */ | |
1875 | if (BGP_DEBUG(as4, AS4)) { | |
1876 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
1877 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
1878 | "AS4 capable peer, yet it sent"); | |
1879 | ||
1880 | if (attr->flag | |
1881 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
1882 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
1883 | peer->host, | |
1884 | "AS4 capable peer, yet it sent"); | |
1885 | } | |
1886 | ||
1887 | return BGP_ATTR_PARSE_PROCEED; | |
1888 | } | |
1889 | ||
1890 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
1891 | * because that may override AS4_PATH | |
1892 | */ | |
1893 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
1894 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
1895 | /* received both. | |
1896 | * if the as_number in aggregator is not AS_TRANS, | |
1897 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
1898 | * and the Aggregator shall be taken as | |
1899 | * info on the aggregating node, and the AS_PATH | |
1900 | * shall be taken as the AS_PATH | |
1901 | * otherwise | |
1902 | * the Aggregator shall be ignored and the | |
1903 | * AS4_AGGREGATOR shall be taken as the | |
1904 | * Aggregating node and the AS_PATH is to be | |
1905 | * constructed "as in all other cases" | |
1906 | */ | |
1907 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
1908 | /* ignore */ | |
1909 | if (BGP_DEBUG(as4, AS4)) | |
1910 | zlog_debug( | |
3efd0893 | 1911 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 1912 | peer->host); |
1913 | ignore_as4_path = 1; | |
1914 | } else { | |
1915 | /* "New_aggregator shall be taken as aggregator" | |
1916 | */ | |
1917 | attr->aggregator_as = as4_aggregator; | |
1918 | attr->aggregator_addr.s_addr = | |
1919 | as4_aggregator_addr->s_addr; | |
1920 | } | |
1921 | } else { | |
1922 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
1923 | * That is bogus - but reading the conditions | |
1924 | * we have to handle AS4_AGGREGATOR as if it were | |
1925 | * AGGREGATOR in that case | |
1926 | */ | |
1927 | if (BGP_DEBUG(as4, AS4)) | |
1928 | zlog_debug( | |
3efd0893 | 1929 | "[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 | 1930 | peer->host); |
1931 | attr->aggregator_as = as4_aggregator; | |
1932 | /* sweep it under the carpet and simulate a "good" | |
1933 | * AGGREGATOR */ | |
1934 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
1939 | if (!ignore_as4_path | |
1940 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
1941 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 1942 | if (!newpath) |
1943 | return BGP_ATTR_PARSE_ERROR; | |
1944 | ||
d62a17ae | 1945 | aspath_unintern(&attr->aspath); |
1946 | attr->aspath = aspath_intern(newpath); | |
1947 | } | |
1948 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1949 | } |
1950 | ||
718e3744 | 1951 | /* Community attribute. */ |
b881c707 | 1952 | static bgp_attr_parse_ret_t |
d62a17ae | 1953 | bgp_attr_community(struct bgp_attr_parser_args *args) |
1954 | { | |
1955 | struct peer *const peer = args->peer; | |
1956 | struct attr *const attr = args->attr; | |
1957 | const bgp_size_t length = args->length; | |
1958 | ||
1959 | if (length == 0) { | |
1960 | attr->community = NULL; | |
6680b550 DA |
1961 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
1962 | args->total); | |
d62a17ae | 1963 | } |
1964 | ||
1965 | attr->community = | |
d7c0a89a | 1966 | community_parse((uint32_t *)stream_pnt(peer->curr), length); |
d62a17ae | 1967 | |
1968 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 1969 | stream_forward_getp(peer->curr, length); |
d62a17ae | 1970 | |
4ba5a9c5 DA |
1971 | /* The Community attribute SHALL be considered malformed if its |
1972 | * length is not a non-zero multiple of 4. | |
1973 | */ | |
d62a17ae | 1974 | if (!attr->community) |
1975 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
1976 | args->total); | |
1977 | ||
1978 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES); | |
1979 | ||
1980 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1981 | } |
1982 | ||
1983 | /* Originator ID attribute. */ | |
b881c707 | 1984 | static bgp_attr_parse_ret_t |
d62a17ae | 1985 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 1986 | { |
d62a17ae | 1987 | struct peer *const peer = args->peer; |
1988 | struct attr *const attr = args->attr; | |
1989 | const bgp_size_t length = args->length; | |
718e3744 | 1990 | |
4ba5a9c5 DA |
1991 | /* if received from an internal neighbor, it SHALL be considered |
1992 | * malformed if its length is not equal to 4. If malformed, the | |
1993 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1994 | * withdraw". | |
1995 | */ | |
d62a17ae | 1996 | if (length != 4) { |
e50f7cfd | 1997 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 1998 | length); |
718e3744 | 1999 | |
d62a17ae | 2000 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2001 | args->total); | |
2002 | } | |
2003 | ||
424ab01d | 2004 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 2005 | |
d62a17ae | 2006 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 2007 | |
d62a17ae | 2008 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2009 | } |
2010 | ||
2011 | /* Cluster list attribute. */ | |
b881c707 | 2012 | static bgp_attr_parse_ret_t |
d62a17ae | 2013 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 2014 | { |
d62a17ae | 2015 | struct peer *const peer = args->peer; |
2016 | struct attr *const attr = args->attr; | |
2017 | const bgp_size_t length = args->length; | |
2018 | ||
4ba5a9c5 DA |
2019 | /* if received from an internal neighbor, it SHALL be considered |
2020 | * malformed if its length is not a non-zero multiple of 4. If | |
2021 | * malformed, the UPDATE message SHALL be handled using the approach | |
2022 | * of "treat-as-withdraw". | |
2023 | */ | |
33ba22c2 | 2024 | if (length == 0 || length % 4) { |
1c50c1c0 | 2025 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 2026 | |
d62a17ae | 2027 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2028 | args->total); | |
2029 | } | |
2030 | ||
779fee93 DS |
2031 | bgp_attr_set_cluster( |
2032 | attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr), | |
2033 | length)); | |
718e3744 | 2034 | |
d62a17ae | 2035 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 2036 | stream_forward_getp(peer->curr, length); |
718e3744 | 2037 | |
d62a17ae | 2038 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 2039 | |
d62a17ae | 2040 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2041 | } |
2042 | ||
2043 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 2044 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
2045 | struct bgp_nlri *mp_update) | |
2046 | { | |
2047 | iana_afi_t pkt_afi; | |
2048 | afi_t afi; | |
5c525538 RW |
2049 | iana_safi_t pkt_safi; |
2050 | safi_t safi; | |
d62a17ae | 2051 | bgp_size_t nlri_len; |
2052 | size_t start; | |
2053 | struct stream *s; | |
2054 | struct peer *const peer = args->peer; | |
2055 | struct attr *const attr = args->attr; | |
2056 | const bgp_size_t length = args->length; | |
2057 | ||
2058 | /* Set end of packet. */ | |
2059 | s = BGP_INPUT(peer); | |
2060 | start = stream_get_getp(s); | |
2061 | ||
2062 | /* safe to read statically sized header? */ | |
6e4ab12f | 2063 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 2064 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 2065 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
2066 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
2067 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 2068 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2069 | } | |
2070 | ||
2071 | /* Load AFI, SAFI. */ | |
2072 | pkt_afi = stream_getw(s); | |
2073 | pkt_safi = stream_getc(s); | |
2074 | ||
2075 | /* Convert AFI, SAFI to internal values, check. */ | |
2076 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2077 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2078 | * unless | |
2079 | * the attribute is otherwise malformed. | |
2080 | */ | |
2081 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2082 | zlog_debug( | |
4cb5e18b | 2083 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
2084 | peer->host, iana_afi2str(pkt_afi), |
2085 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2086 | return BGP_ATTR_PARSE_ERROR; |
2087 | } | |
2088 | ||
2089 | /* Get nexthop length. */ | |
2090 | attr->mp_nexthop_len = stream_getc(s); | |
2091 | ||
2092 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
2093 | zlog_info( | |
4cb5e18b | 2094 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 2095 | __func__, peer->host, attr->mp_nexthop_len); |
2096 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2097 | } | |
2098 | ||
2099 | /* Nexthop length check. */ | |
2100 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2101 | case 0: |
2102 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2103 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2104 | __func__, peer->host, attr->mp_nexthop_len); |
2105 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2106 | } | |
2107 | break; | |
b6453163 LB |
2108 | case BGP_ATTR_NHLEN_VPNV4: |
2109 | stream_getl(s); /* RD high */ | |
2110 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2111 | /* |
2112 | * NOTE: intentional fall through | |
2113 | * - for consistency in rx processing | |
2114 | * | |
2115 | * The following comment is to signal GCC this intention | |
0437e105 | 2116 | * and suppress the warning |
996c9314 LB |
2117 | */ |
2118 | /* FALLTHRU */ | |
d62a17ae | 2119 | case BGP_ATTR_NHLEN_IPV4: |
2120 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2121 | /* Probably needed for RFC 2283 */ | |
975a328e | 2122 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2123 | memcpy(&attr->nexthop.s_addr, |
2124 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2125 | break; | |
d62a17ae | 2126 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2127 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2128 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2129 | stream_getl(s); /* RD high */ | |
2130 | stream_getl(s); /* RD low */ | |
2131 | } | |
2132 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2133 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2134 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2135 | 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 |
2136 | peer->host); |
2137 | return BGP_ATTR_PARSE_WITHDRAW; | |
2138 | } | |
77e62f2b | 2139 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2140 | } |
d62a17ae | 2141 | break; |
2142 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2143 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2144 | if (attr->mp_nexthop_len | |
2145 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2146 | stream_getl(s); /* RD high */ | |
2147 | stream_getl(s); /* RD low */ | |
2148 | } | |
2149 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2150 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2151 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2152 | 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 |
2153 | peer->host); |
2154 | return BGP_ATTR_PARSE_WITHDRAW; | |
2155 | } | |
77e62f2b | 2156 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2157 | } |
d62a17ae | 2158 | if (attr->mp_nexthop_len |
2159 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2160 | stream_getl(s); /* RD high */ | |
2161 | stream_getl(s); /* RD low */ | |
2162 | } | |
2163 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2164 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
d62a17ae | 2165 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2166 | zlog_debug( | |
c0d72166 DS |
2167 | "%s sent next-hops %pI6 and %pI6. Ignoring non-LL value", |
2168 | peer->host, &attr->mp_nexthop_global, | |
2169 | &attr->mp_nexthop_local); | |
d62a17ae | 2170 | |
2171 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2172 | } | |
17cdd31e | 2173 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2174 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2175 | peer->host); |
2176 | return BGP_ATTR_PARSE_WITHDRAW; | |
2177 | } | |
77e62f2b | 2178 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2179 | break; |
2180 | default: | |
4cb5e18b | 2181 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2182 | __func__, peer->host, attr->mp_nexthop_len); |
2183 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2184 | } | |
2185 | ||
2186 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2187 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2188 | __func__, peer->host); | |
d62a17ae | 2189 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2190 | } | |
2191 | ||
718e3744 | 2192 | { |
d7c0a89a | 2193 | uint8_t val; |
d62a17ae | 2194 | if ((val = stream_getc(s))) |
ade6974d | 2195 | flog_warn( |
e50f7cfd | 2196 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2197 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2198 | peer->host, val); | |
d62a17ae | 2199 | } |
2200 | ||
2201 | /* must have nrli_len, what is left of the attribute */ | |
2202 | nlri_len = LEN_LEFT; | |
9b9df989 | 2203 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2204 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2205 | __func__, peer->host); | |
d62a17ae | 2206 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2207 | } | |
2208 | ||
9b9df989 | 2209 | if (!nlri_len) { |
4cb5e18b | 2210 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2211 | __func__, peer->host); |
2212 | ||
2213 | mp_update->afi = afi; | |
2214 | mp_update->safi = safi; | |
2215 | return BGP_ATTR_PARSE_EOR; | |
2216 | } | |
2217 | ||
d62a17ae | 2218 | mp_update->afi = afi; |
2219 | mp_update->safi = safi; | |
2220 | mp_update->nlri = stream_pnt(s); | |
2221 | mp_update->length = nlri_len; | |
2222 | ||
2223 | stream_forward_getp(s, nlri_len); | |
2224 | ||
2225 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2226 | ||
2227 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2228 | #undef LEN_LEFT |
718e3744 | 2229 | } |
2230 | ||
2231 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2232 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2233 | struct bgp_nlri *mp_withdraw) | |
2234 | { | |
2235 | struct stream *s; | |
2236 | iana_afi_t pkt_afi; | |
2237 | afi_t afi; | |
5c525538 RW |
2238 | iana_safi_t pkt_safi; |
2239 | safi_t safi; | |
d7c0a89a | 2240 | uint16_t withdraw_len; |
d62a17ae | 2241 | struct peer *const peer = args->peer; |
2242 | struct attr *const attr = args->attr; | |
2243 | const bgp_size_t length = args->length; | |
9cabb64b | 2244 | |
424ab01d | 2245 | s = peer->curr; |
9cabb64b | 2246 | |
d62a17ae | 2247 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2248 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2249 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2250 | ||
2251 | pkt_afi = stream_getw(s); | |
2252 | pkt_safi = stream_getc(s); | |
2253 | ||
2254 | /* Convert AFI, SAFI to internal values, check. */ | |
2255 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2256 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2257 | * unless | |
2258 | * the attribute is otherwise malformed. | |
2259 | */ | |
2260 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2261 | zlog_debug( | |
748a041f DS |
2262 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2263 | peer->host, iana_afi2str(pkt_afi), | |
2264 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2265 | return BGP_ATTR_PARSE_ERROR; |
2266 | } | |
718e3744 | 2267 | |
d62a17ae | 2268 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2269 | |
d62a17ae | 2270 | mp_withdraw->afi = afi; |
2271 | mp_withdraw->safi = safi; | |
2272 | mp_withdraw->nlri = stream_pnt(s); | |
2273 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2274 | |
d62a17ae | 2275 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2276 | |
d62a17ae | 2277 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2278 | ||
2279 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2280 | } |
2281 | ||
57d187bc JS |
2282 | /* Large Community attribute. */ |
2283 | static bgp_attr_parse_ret_t | |
d62a17ae | 2284 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2285 | { | |
2286 | struct peer *const peer = args->peer; | |
2287 | struct attr *const attr = args->attr; | |
2288 | const bgp_size_t length = args->length; | |
2289 | ||
2290 | /* | |
2291 | * Large community follows new attribute format. | |
2292 | */ | |
2293 | if (length == 0) { | |
2294 | attr->lcommunity = NULL; | |
2295 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2296 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2297 | args->total); | |
d62a17ae | 2298 | } |
57d187bc | 2299 | |
c4efd0f4 | 2300 | attr->lcommunity = lcommunity_parse(stream_pnt(peer->curr), length); |
d62a17ae | 2301 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2302 | stream_forward_getp(peer->curr, length); |
57d187bc | 2303 | |
d62a17ae | 2304 | if (!attr->lcommunity) |
2305 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2306 | args->total); | |
57d187bc | 2307 | |
d62a17ae | 2308 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES); |
57d187bc | 2309 | |
d62a17ae | 2310 | return BGP_ATTR_PARSE_PROCEED; |
57d187bc JS |
2311 | } |
2312 | ||
718e3744 | 2313 | /* Extended Community attribute. */ |
b881c707 | 2314 | static bgp_attr_parse_ret_t |
d62a17ae | 2315 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2316 | { | |
2317 | struct peer *const peer = args->peer; | |
2318 | struct attr *const attr = args->attr; | |
2319 | const bgp_size_t length = args->length; | |
d7c0a89a | 2320 | uint8_t sticky = 0; |
7904e9fd | 2321 | bool proxy = false; |
d62a17ae | 2322 | |
2323 | if (length == 0) { | |
2324 | attr->ecommunity = NULL; | |
2325 | /* Empty extcomm doesn't seem to be invalid per se */ | |
6680b550 DA |
2326 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2327 | args->total); | |
d62a17ae | 2328 | } |
2329 | ||
27aa23a4 DA |
2330 | attr->ecommunity = ecommunity_parse( |
2331 | stream_pnt(peer->curr), length, | |
2332 | CHECK_FLAG(peer->flags, | |
2333 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d62a17ae | 2334 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2335 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2336 | |
4ba5a9c5 DA |
2337 | /* The Extended Community attribute SHALL be considered malformed if |
2338 | * its length is not a non-zero multiple of 8. | |
2339 | */ | |
d62a17ae | 2340 | if (!attr->ecommunity) |
2341 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2342 | args->total); | |
2343 | ||
2344 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES); | |
2345 | ||
74e2bd89 AK |
2346 | /* Extract DF election preference and mobility sequence number */ |
2347 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2348 | ||
d62a17ae | 2349 | /* Extract MAC mobility sequence number, if any. */ |
2350 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2351 | attr->sticky = sticky; | |
2352 | ||
ead40654 MK |
2353 | /* Check if this is a Gateway MAC-IP advertisement */ |
2354 | attr->default_gw = bgp_attr_default_gw(attr); | |
2355 | ||
68e33151 CS |
2356 | /* Handle scenario where router flag ecommunity is not |
2357 | * set but default gw ext community is present. | |
2358 | * Use default gateway, set and propogate R-bit. | |
2359 | */ | |
2360 | if (attr->default_gw) | |
2361 | attr->router_flag = 1; | |
2362 | ||
2363 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2364 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2365 | if (proxy) | |
2366 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2367 | |
bc59a672 | 2368 | /* Extract the Rmac, if any */ |
eee353c5 | 2369 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
c0d72166 DS |
2370 | if (bgp_debug_update(peer, NULL, NULL, 1) |
2371 | && bgp_mac_exist(&attr->rmac)) | |
2372 | zlog_debug("%s: router mac %pEA is self mac", __func__, | |
2373 | &attr->rmac); | |
eee353c5 | 2374 | } |
bc59a672 | 2375 | |
f4bd90c5 LK |
2376 | /* Get the tunnel type from encap extended community */ |
2377 | bgp_attr_extcom_tunnel_type(attr, | |
2378 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2379 | ||
d901dc13 | 2380 | /* Extract link bandwidth, if any. */ |
2381 | (void)ecommunity_linkbw_present(attr->ecommunity, &attr->link_bw); | |
2382 | ||
d62a17ae | 2383 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2384 | } |
2385 | ||
9a659715 PG |
2386 | /* IPv6 Extended Community attribute. */ |
2387 | static bgp_attr_parse_ret_t | |
2388 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) | |
2389 | { | |
2390 | struct peer *const peer = args->peer; | |
2391 | struct attr *const attr = args->attr; | |
2392 | const bgp_size_t length = args->length; | |
d04ac434 | 2393 | struct ecommunity *ipv6_ecomm = NULL; |
9a659715 PG |
2394 | |
2395 | if (length == 0) { | |
d04ac434 | 2396 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
c6423c31 PG |
2397 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2398 | args->total); | |
9a659715 PG |
2399 | } |
2400 | ||
27aa23a4 DA |
2401 | ipv6_ecomm = ecommunity_parse_ipv6( |
2402 | stream_pnt(peer->curr), length, | |
2403 | CHECK_FLAG(peer->flags, | |
2404 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d04ac434 DS |
2405 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
2406 | ||
9a659715 PG |
2407 | /* XXX: fix ecommunity_parse to use stream API */ |
2408 | stream_forward_getp(peer->curr, length); | |
2409 | ||
d04ac434 | 2410 | if (!ipv6_ecomm) |
9a659715 PG |
2411 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2412 | args->total); | |
2413 | ||
2414 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES); | |
2415 | ||
2416 | return BGP_ATTR_PARSE_PROCEED; | |
2417 | } | |
2418 | ||
f4c89855 | 2419 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2420 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2421 | bgp_size_t length, /* IN: attr's length field */ | |
2422 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2423 | uint8_t flag, /* IN: attr's flags field */ |
2424 | uint8_t *startp) | |
d62a17ae | 2425 | { |
2426 | bgp_size_t total; | |
d62a17ae | 2427 | uint16_t tunneltype = 0; |
2428 | ||
2429 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2430 | ||
2431 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2432 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2433 | zlog_info( | |
2434 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2435 | flag); | |
2436 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2437 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2438 | startp, total); | |
2439 | return -1; | |
2440 | } | |
2441 | ||
2442 | if (BGP_ATTR_ENCAP == type) { | |
2443 | /* read outer TLV type and length */ | |
2444 | uint16_t tlv_length; | |
2445 | ||
2446 | if (length < 4) { | |
2447 | zlog_info( | |
2448 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2449 | bgp_notify_send_with_data( | |
2450 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2451 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2452 | return -1; | |
2453 | } | |
2454 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2455 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2456 | length -= 4; | |
2457 | ||
2458 | if (tlv_length != length) { | |
4cb5e18b NT |
2459 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2460 | __func__, tlv_length, length); | |
d62a17ae | 2461 | } |
2462 | } | |
2463 | ||
2464 | while (length >= 4) { | |
2465 | uint16_t subtype = 0; | |
2466 | uint16_t sublength = 0; | |
2467 | struct bgp_attr_encap_subtlv *tlv; | |
2468 | ||
2469 | if (BGP_ATTR_ENCAP == type) { | |
2470 | subtype = stream_getc(BGP_INPUT(peer)); | |
2471 | sublength = stream_getc(BGP_INPUT(peer)); | |
2472 | length -= 2; | |
1e20238a | 2473 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2474 | } else { |
2475 | subtype = stream_getw(BGP_INPUT(peer)); | |
2476 | sublength = stream_getw(BGP_INPUT(peer)); | |
2477 | length -= 4; | |
65efcfce | 2478 | #endif |
d62a17ae | 2479 | } |
2480 | ||
2481 | if (sublength > length) { | |
2482 | zlog_info( | |
2483 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2484 | sublength, length); | |
2485 | bgp_notify_send_with_data( | |
2486 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2487 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2488 | return -1; | |
2489 | } | |
2490 | ||
2491 | /* alloc and copy sub-tlv */ | |
2492 | /* TBD make sure these are freed when attributes are released */ | |
2493 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2494 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2495 | tlv->type = subtype; |
2496 | tlv->length = sublength; | |
424ab01d | 2497 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2498 | length -= sublength; |
2499 | ||
2500 | /* attach tlv to encap chain */ | |
2501 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2502 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2503 | for (stlv_last = attr->encap_subtlvs; |
2504 | stlv_last && stlv_last->next; | |
2505 | stlv_last = stlv_last->next) | |
2506 | ; | |
2507 | if (stlv_last) { | |
2508 | stlv_last->next = tlv; | |
2509 | } else { | |
2510 | attr->encap_subtlvs = tlv; | |
2511 | } | |
1e20238a | 2512 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2513 | } else { |
e4002056 | 2514 | struct bgp_attr_encap_subtlv *stlv_last; |
91ebf12c DS |
2515 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
2516 | bgp_attr_get_vnc_subtlvs(attr); | |
2517 | ||
2518 | for (stlv_last = vnc_subtlvs; | |
d62a17ae | 2519 | stlv_last && stlv_last->next; |
2520 | stlv_last = stlv_last->next) | |
2521 | ; | |
91ebf12c | 2522 | if (stlv_last) |
d62a17ae | 2523 | stlv_last->next = tlv; |
91ebf12c DS |
2524 | else |
2525 | bgp_attr_set_vnc_subtlvs(attr, tlv); | |
aadc0905 | 2526 | #endif |
d62a17ae | 2527 | } |
d62a17ae | 2528 | } |
f4c89855 | 2529 | |
d62a17ae | 2530 | if (BGP_ATTR_ENCAP == type) { |
2531 | attr->encap_tunneltype = tunneltype; | |
2532 | } | |
f4c89855 | 2533 | |
d62a17ae | 2534 | if (length) { |
2535 | /* spurious leftover data */ | |
2536 | zlog_info( | |
2537 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2538 | length); | |
2539 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2540 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2541 | startp, total); | |
2542 | return -1; | |
2543 | } | |
f4c89855 | 2544 | |
d62a17ae | 2545 | return 0; |
f4c89855 LB |
2546 | } |
2547 | ||
73604f82 RS |
2548 | |
2549 | /* SRv6 Service Data Sub-Sub-TLV attribute | |
2550 | * draft-ietf-bess-srv6-services-07 | |
2551 | */ | |
2552 | static bgp_attr_parse_ret_t | |
2553 | bgp_attr_srv6_service_data(struct bgp_attr_parser_args *args) | |
2554 | { | |
2555 | struct peer *const peer = args->peer; | |
9299fd00 | 2556 | struct attr *const attr = args->attr; |
73604f82 RS |
2557 | uint8_t type, loc_block_len, loc_node_len, func_len, arg_len, |
2558 | transposition_len, transposition_offset; | |
2559 | uint16_t length; | |
2560 | size_t headersz = sizeof(type) + sizeof(length); | |
2561 | ||
2562 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2563 | flog_err( | |
2564 | EC_BGP_ATTR_LEN, | |
2565 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2566 | headersz, STREAM_READABLE(peer->curr)); | |
2567 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2568 | args->total); | |
2569 | } | |
2570 | ||
2571 | type = stream_getc(peer->curr); | |
2572 | length = stream_getw(peer->curr); | |
2573 | ||
2574 | if (STREAM_READABLE(peer->curr) < length) { | |
2575 | flog_err( | |
2576 | EC_BGP_ATTR_LEN, | |
2577 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2578 | length, STREAM_READABLE(peer->curr)); | |
2579 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2580 | args->total); | |
2581 | } | |
2582 | ||
2583 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE) { | |
2584 | loc_block_len = stream_getc(peer->curr); | |
2585 | loc_node_len = stream_getc(peer->curr); | |
2586 | func_len = stream_getc(peer->curr); | |
2587 | arg_len = stream_getc(peer->curr); | |
2588 | transposition_len = stream_getc(peer->curr); | |
2589 | transposition_offset = stream_getc(peer->curr); | |
2590 | ||
2591 | /* Log SRv6 Service Data Sub-Sub-TLV */ | |
2592 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2593 | zlog_debug( | |
2594 | "%s: srv6-l3-srv-data loc-block-len=%u, loc-node-len=%u func-len=%u, arg-len=%u, transposition-len=%u, transposition-offset=%u", | |
2595 | __func__, loc_block_len, loc_node_len, func_len, | |
2596 | arg_len, transposition_len, | |
2597 | transposition_offset); | |
2598 | } | |
9299fd00 RS |
2599 | |
2600 | attr->srv6_l3vpn->loc_block_len = loc_block_len; | |
2601 | attr->srv6_l3vpn->loc_node_len = loc_node_len; | |
2602 | attr->srv6_l3vpn->func_len = func_len; | |
2603 | attr->srv6_l3vpn->arg_len = arg_len; | |
2604 | attr->srv6_l3vpn->transposition_len = transposition_len; | |
2605 | attr->srv6_l3vpn->transposition_offset = transposition_offset; | |
73604f82 RS |
2606 | } |
2607 | ||
2608 | else { | |
2609 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2610 | zlog_debug( | |
2611 | "%s attr SRv6 Service Data Sub-Sub-TLV sub-sub-type=%u is not supported, skipped", | |
2612 | peer->host, type); | |
2613 | ||
2614 | stream_forward_getp(peer->curr, length); | |
2615 | } | |
2616 | ||
2617 | return BGP_ATTR_PARSE_PROCEED; | |
2618 | } | |
2619 | ||
2620 | /* SRv6 Service Sub-TLV attribute | |
2621 | * draft-ietf-bess-srv6-services-07 | |
2622 | */ | |
2623 | static bgp_attr_parse_ret_t | |
2624 | bgp_attr_srv6_service(struct bgp_attr_parser_args *args) | |
2625 | { | |
2626 | struct peer *const peer = args->peer; | |
2627 | struct attr *const attr = args->attr; | |
2628 | struct in6_addr ipv6_sid; | |
2629 | uint8_t type, sid_flags; | |
2630 | uint16_t length, endpoint_behavior; | |
2631 | size_t headersz = sizeof(type) + sizeof(length); | |
9299fd00 | 2632 | bgp_attr_parse_ret_t err; |
73604f82 RS |
2633 | char buf[BUFSIZ]; |
2634 | ||
2635 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2636 | flog_err( | |
2637 | EC_BGP_ATTR_LEN, | |
2638 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2639 | headersz, STREAM_READABLE(peer->curr)); | |
2640 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2641 | args->total); | |
2642 | } | |
2643 | ||
2644 | type = stream_getc(peer->curr); | |
2645 | length = stream_getw(peer->curr); | |
2646 | ||
2647 | if (STREAM_READABLE(peer->curr) < length) { | |
2648 | flog_err( | |
2649 | EC_BGP_ATTR_LEN, | |
2650 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2651 | length, STREAM_READABLE(peer->curr)); | |
2652 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2653 | args->total); | |
2654 | } | |
2655 | ||
2656 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO) { | |
2657 | stream_getc(peer->curr); | |
2658 | stream_get(&ipv6_sid, peer->curr, sizeof(ipv6_sid)); | |
2659 | sid_flags = stream_getc(peer->curr); | |
2660 | endpoint_behavior = stream_getw(peer->curr); | |
2661 | stream_getc(peer->curr); | |
2662 | ||
2663 | /* Log SRv6 Service Sub-TLV */ | |
2664 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2665 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2666 | zlog_debug( | |
2667 | "%s: srv6-l3-srv sid %s, sid-flags 0x%02x, end-behaviour 0x%04x", | |
2668 | __func__, buf, sid_flags, endpoint_behavior); | |
2669 | } | |
2670 | ||
2671 | /* Configure from Info */ | |
2672 | if (attr->srv6_l3vpn) { | |
2673 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2674 | "Prefix SID SRv6 L3VPN field repeated"); | |
2675 | return bgp_attr_malformed( | |
2676 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2677 | } | |
2678 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, | |
2679 | sizeof(struct bgp_attr_srv6_l3vpn)); | |
9299fd00 | 2680 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); |
73604f82 RS |
2681 | attr->srv6_l3vpn->sid_flags = sid_flags; |
2682 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
9299fd00 RS |
2683 | attr->srv6_l3vpn->loc_block_len = 0; |
2684 | attr->srv6_l3vpn->loc_node_len = 0; | |
2685 | attr->srv6_l3vpn->func_len = 0; | |
2686 | attr->srv6_l3vpn->arg_len = 0; | |
2687 | attr->srv6_l3vpn->transposition_len = 0; | |
2688 | attr->srv6_l3vpn->transposition_offset = 0; | |
73604f82 RS |
2689 | |
2690 | // Sub-Sub-TLV found | |
9299fd00 RS |
2691 | if (length > BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { |
2692 | err = bgp_attr_srv6_service_data(args); | |
2693 | ||
2694 | if (err != BGP_ATTR_PARSE_PROCEED) | |
2695 | return err; | |
2696 | } | |
2697 | ||
2698 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
73604f82 RS |
2699 | } |
2700 | ||
2701 | /* Placeholder code for unsupported type */ | |
2702 | else { | |
2703 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2704 | zlog_debug( | |
2705 | "%s attr SRv6 Service Sub-TLV sub-type=%u is not supported, skipped", | |
2706 | peer->host, type); | |
2707 | ||
2708 | stream_forward_getp(peer->curr, length); | |
2709 | } | |
2710 | ||
2711 | return BGP_ATTR_PARSE_PROCEED; | |
2712 | } | |
2713 | ||
30adbd4e DS |
2714 | /* |
2715 | * Read an individual SID value returning how much data we have read | |
2716 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2717 | */ |
f69aeb76 | 2718 | static bgp_attr_parse_ret_t bgp_attr_psid_sub(uint8_t type, uint16_t length, |
45a06b11 | 2719 | struct bgp_attr_parser_args *args) |
d62a17ae | 2720 | { |
2721 | struct peer *const peer = args->peer; | |
2722 | struct attr *const attr = args->attr; | |
d7c0a89a | 2723 | uint32_t label_index; |
d62a17ae | 2724 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2725 | uint32_t srgb_base; |
2726 | uint32_t srgb_range; | |
d62a17ae | 2727 | int srgb_count; |
e496b420 | 2728 | uint8_t sid_type, sid_flags; |
e496b420 | 2729 | char buf[BUFSIZ]; |
d62a17ae | 2730 | |
d62a17ae | 2731 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2732 | if (STREAM_READABLE(peer->curr) < length |
2733 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2734 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2735 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2736 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2737 | return bgp_attr_malformed(args, |
2738 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2739 | args->total); | |
d62a17ae | 2740 | } |
2741 | ||
2742 | /* Ignore flags and reserved */ | |
424ab01d QY |
2743 | stream_getc(peer->curr); |
2744 | stream_getw(peer->curr); | |
d62a17ae | 2745 | |
2746 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2747 | label_index = stream_getl(peer->curr); |
d62a17ae | 2748 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2749 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2750 | args->total); | |
d62a17ae | 2751 | |
2752 | /* Store label index; subsequently, we'll check on | |
2753 | * address-family */ | |
2754 | attr->label_index = label_index; | |
d62a17ae | 2755 | } |
2756 | ||
2757 | /* Placeholder code for the IPv6 SID type */ | |
2758 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
2759 | if (STREAM_READABLE(peer->curr) < length |
2760 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2761 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2762 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 2763 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
2764 | return bgp_attr_malformed(args, |
2765 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2766 | args->total); | |
d62a17ae | 2767 | } |
2768 | ||
2769 | /* Ignore reserved */ | |
424ab01d QY |
2770 | stream_getc(peer->curr); |
2771 | stream_getw(peer->curr); | |
d62a17ae | 2772 | |
424ab01d | 2773 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2774 | } |
2775 | ||
2776 | /* Placeholder code for the Originator SRGB type */ | |
2777 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
2778 | /* |
2779 | * ietf-idr-bgp-prefix-sid-05: | |
2780 | * Length is the total length of the value portion of the | |
2781 | * TLV: 2 + multiple of 6. | |
2782 | * | |
2783 | * peer->curr stream readp should be at the beginning of the 16 | |
2784 | * bit flag field at this point in the code. | |
2785 | */ | |
d62a17ae | 2786 | |
473046ee QY |
2787 | /* |
2788 | * Check that the TLV length field is sane: at least 2 bytes of | |
2789 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
2790 | */ | |
2791 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
2792 | flog_err( | |
2793 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2794 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
2795 | length, |
2796 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2797 | return bgp_attr_malformed( | |
2798 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2799 | args->total); | |
2800 | } | |
d62a17ae | 2801 | |
473046ee QY |
2802 | /* |
2803 | * Check that we actually have at least as much data as | |
2804 | * specified by the length field | |
2805 | */ | |
2806 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 2807 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2808 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 2809 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
2810 | return bgp_attr_malformed( |
2811 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2812 | args->total); | |
2813 | } | |
2814 | ||
473046ee QY |
2815 | /* |
2816 | * Check that the portion of the TLV containing the sequence of | |
2817 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
2818 | * that length, we skip the 16 bit flags field | |
2819 | */ | |
424ab01d | 2820 | stream_getw(peer->curr); |
d62a17ae | 2821 | length -= 2; |
d62a17ae | 2822 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 2823 | flog_err( |
e50f7cfd | 2824 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2825 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 2826 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
2827 | return bgp_attr_malformed( | |
2828 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2829 | args->total); | |
2830 | } | |
2831 | ||
2832 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
2833 | ||
2834 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
2835 | stream_get(&srgb_base, peer->curr, 3); |
2836 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 2837 | } |
2838 | } | |
2839 | ||
e496b420 HS |
2840 | /* Placeholder code for the VPN-SID Service type */ |
2841 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
2842 | if (STREAM_READABLE(peer->curr) < length | |
2843 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
2844 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2845 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
2846 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
2847 | return bgp_attr_malformed(args, | |
2848 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2849 | args->total); | |
2850 | } | |
2851 | ||
2852 | /* Parse VPN-SID Sub-TLV */ | |
2853 | stream_getc(peer->curr); /* reserved */ | |
2854 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
2855 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
2856 | stream_get(&ipv6_sid, peer->curr, | |
2857 | sizeof(ipv6_sid)); /* sid_value */ | |
2858 | ||
2859 | /* Log VPN-SID Sub-TLV */ | |
2860 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2861 | inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf)); | |
2862 | zlog_debug( | |
2863 | "%s: vpn-sid: sid %s, sid-type 0x%02x sid-flags 0x%02x", | |
2864 | __func__, buf, sid_type, sid_flags); | |
2865 | } | |
2866 | ||
2867 | /* Configure from Info */ | |
b502ca11 QY |
2868 | if (attr->srv6_vpn) { |
2869 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2870 | "Prefix SID SRv6 VPN field repeated"); | |
2871 | return bgp_attr_malformed( | |
2872 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2873 | } | |
340594a9 | 2874 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 2875 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
2876 | attr->srv6_vpn->sid_flags = sid_flags; |
2877 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
b83127e1 | 2878 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); |
e496b420 HS |
2879 | } |
2880 | ||
2881 | /* Placeholder code for the SRv6 L3 Service type */ | |
2882 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
73604f82 RS |
2883 | if (STREAM_READABLE(peer->curr) < length) { |
2884 | flog_err( | |
2885 | EC_BGP_ATTR_LEN, | |
2886 | "Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain", | |
2887 | length, STREAM_READABLE(peer->curr)); | |
e496b420 HS |
2888 | return bgp_attr_malformed(args, |
2889 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2890 | args->total); | |
2891 | } | |
2892 | ||
73604f82 RS |
2893 | /* ignore reserved */ |
2894 | stream_getc(peer->curr); | |
e496b420 | 2895 | |
73604f82 | 2896 | return bgp_attr_srv6_service(args); |
e496b420 HS |
2897 | } |
2898 | ||
2899 | /* Placeholder code for Unsupported TLV */ | |
2900 | else { | |
f69aeb76 QY |
2901 | |
2902 | if (STREAM_READABLE(peer->curr) < length) { | |
2903 | flog_err( | |
2904 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2905 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
2906 | length, STREAM_READABLE(peer->curr)); |
2907 | return bgp_attr_malformed( | |
2908 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2909 | args->total); | |
2910 | } | |
2911 | ||
c6ca155d HS |
2912 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2913 | zlog_debug( | |
2914 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
2915 | peer->host, type); | |
f69aeb76 QY |
2916 | |
2917 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
2918 | } |
2919 | ||
d62a17ae | 2920 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
2921 | } |
2922 | ||
30adbd4e DS |
2923 | /* Prefix SID attribute |
2924 | * draft-ietf-idr-bgp-prefix-sid-05 | |
2925 | */ | |
45a06b11 | 2926 | bgp_attr_parse_ret_t bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
2927 | { |
2928 | struct peer *const peer = args->peer; | |
2929 | struct attr *const attr = args->attr; | |
2930 | bgp_attr_parse_ret_t ret; | |
2931 | ||
2932 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
2933 | ||
f69aeb76 QY |
2934 | uint8_t type; |
2935 | uint16_t length; | |
2936 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 2937 | size_t psid_parsed_length = 0; |
30adbd4e | 2938 | |
38774fc5 HS |
2939 | while (STREAM_READABLE(peer->curr) > 0 |
2940 | && psid_parsed_length < args->length) { | |
30adbd4e | 2941 | |
f69aeb76 QY |
2942 | if (STREAM_READABLE(peer->curr) < headersz) { |
2943 | flog_err( | |
2944 | EC_BGP_ATTR_LEN, | |
2945 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2946 | headersz, STREAM_READABLE(peer->curr)); | |
2947 | return bgp_attr_malformed( | |
2948 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2949 | args->total); | |
2950 | } | |
30adbd4e | 2951 | |
f69aeb76 QY |
2952 | type = stream_getc(peer->curr); |
2953 | length = stream_getw(peer->curr); | |
30adbd4e | 2954 | |
f69aeb76 | 2955 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 2956 | flog_err( |
e50f7cfd | 2957 | EC_BGP_ATTR_LEN, |
6cde4b45 | 2958 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 2959 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
2960 | return bgp_attr_malformed(args, |
2961 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2962 | args->total); | |
2963 | } | |
f69aeb76 | 2964 | |
45a06b11 | 2965 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
2966 | |
2967 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
2968 | return ret; | |
38774fc5 HS |
2969 | |
2970 | psid_parsed_length += length + headersz; | |
2971 | ||
2972 | if (psid_parsed_length > args->length) { | |
2973 | flog_err( | |
2974 | EC_BGP_ATTR_LEN, | |
3efd0893 | 2975 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
2976 | length + headersz, psid_parsed_length - (length + headersz)); |
2977 | return bgp_attr_malformed( | |
2978 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2979 | args->total); | |
2980 | } | |
30adbd4e DS |
2981 | } |
2982 | ||
2983 | return BGP_ATTR_PARSE_PROCEED; | |
2984 | } | |
2985 | ||
7fd077aa | 2986 | /* PMSI tunnel attribute (RFC 6514) |
2987 | * Basic validation checks done here. | |
2988 | */ | |
2989 | static bgp_attr_parse_ret_t | |
2990 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) | |
2991 | { | |
2992 | struct peer *const peer = args->peer; | |
2993 | struct attr *const attr = args->attr; | |
2994 | const bgp_size_t length = args->length; | |
d7c0a89a | 2995 | uint8_t tnl_type; |
355f3c11 | 2996 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 2997 | |
2998 | /* Verify that the receiver is expecting "ingress replication" as we | |
2999 | * can only support that. | |
3000 | */ | |
355f3c11 | 3001 | if (length < attr_parse_len) { |
1c50c1c0 QY |
3002 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
3003 | length); | |
7fd077aa | 3004 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
3005 | args->total); | |
3006 | } | |
3007 | stream_getc(peer->curr); /* Flags */ | |
3008 | tnl_type = stream_getc(peer->curr); | |
3009 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 3010 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 3011 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 3012 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
3013 | args->total); | |
3014 | } | |
3015 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
3016 | if (length != 9) { | |
e50f7cfd | 3017 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
3018 | "Bad PMSI tunnel attribute length %d for IR", |
3019 | length); | |
052ea98b | 3020 | return bgp_attr_malformed( |
3021 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3022 | args->total); | |
7fd077aa | 3023 | } |
3024 | } | |
3025 | ||
3026 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2a3f51cf | 3027 | bgp_attr_set_pmsi_tnl_type(attr, tnl_type); |
355f3c11 | 3028 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 3029 | |
3030 | /* Forward read pointer of input stream. */ | |
355f3c11 | 3031 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 3032 | |
3033 | return BGP_ATTR_PARSE_PROCEED; | |
3034 | } | |
3035 | ||
718e3744 | 3036 | /* BGP unknown attribute treatment. */ |
d62a17ae | 3037 | static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args) |
3038 | { | |
3039 | bgp_size_t total = args->total; | |
3040 | struct transit *transit; | |
3041 | struct peer *const peer = args->peer; | |
3042 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
3043 | uint8_t *const startp = args->startp; |
3044 | const uint8_t type = args->type; | |
3045 | const uint8_t flag = args->flags; | |
d62a17ae | 3046 | const bgp_size_t length = args->length; |
3047 | ||
3048 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3049 | zlog_debug( | |
3050 | "%s Unknown attribute is received (type %d, length %d)", | |
3051 | peer->host, type, length); | |
3052 | ||
3053 | /* Forward read pointer of input stream. */ | |
424ab01d | 3054 | stream_forward_getp(peer->curr, length); |
d62a17ae | 3055 | |
3056 | /* If any of the mandatory well-known attributes are not recognized, | |
3057 | then the Error Subcode is set to Unrecognized Well-known | |
3058 | Attribute. The Data field contains the unrecognized attribute | |
3059 | (type, length and value). */ | |
3060 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
3061 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
3062 | args->total); | |
3063 | } | |
3064 | ||
3065 | /* Unrecognized non-transitive optional attributes must be quietly | |
3066 | ignored and not passed along to other BGP peers. */ | |
3067 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
3068 | return BGP_ATTR_PARSE_PROCEED; | |
3069 | ||
3070 | /* If a path with recognized transitive optional attribute is | |
3071 | accepted and passed along to other BGP peers and the Partial bit | |
3072 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
3073 | is not set back to 0 by the current AS. */ | |
3074 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
3075 | ||
3076 | /* Store transitive attribute to the end of attr->transit. */ | |
04fb21e2 DS |
3077 | transit = bgp_attr_get_transit(attr); |
3078 | if (!transit) | |
3079 | transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
d62a17ae | 3080 | |
0b04fa0e DS |
3081 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, |
3082 | transit->length + total); | |
d62a17ae | 3083 | |
3084 | memcpy(transit->val + transit->length, startp, total); | |
3085 | transit->length += total; | |
04fb21e2 | 3086 | bgp_attr_set_transit(attr, transit); |
d62a17ae | 3087 | |
3088 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 3089 | } |
3090 | ||
bb7bef14 | 3091 | /* Well-known attribute check. */ |
d62a17ae | 3092 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
3093 | { | |
d7c0a89a | 3094 | uint8_t type = 0; |
d62a17ae | 3095 | |
3096 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
3097 | * empty UPDATE. */ | |
3098 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
3099 | return BGP_ATTR_PARSE_PROCEED; | |
3100 | ||
3101 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
3102 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
3103 | are present, it should. Check for any other attribute being present | |
3104 | instead. | |
3105 | */ | |
404c82d5 PG |
3106 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
3107 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 3108 | return BGP_ATTR_PARSE_PROCEED; |
3109 | ||
3110 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
3111 | type = BGP_ATTR_ORIGIN; | |
3112 | ||
3113 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
3114 | type = BGP_ATTR_AS_PATH; | |
3115 | ||
3116 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
3117 | * and | |
3118 | * NLRI is empty. We can't easily check NLRI empty here though. | |
3119 | */ | |
3120 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3121 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
3122 | type = BGP_ATTR_NEXT_HOP; | |
3123 | ||
3124 | if (peer->sort == BGP_PEER_IBGP | |
3125 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
3126 | type = BGP_ATTR_LOCAL_PREF; | |
3127 | ||
4ba5a9c5 DA |
3128 | /* If any of the well-known mandatory attributes are not present |
3129 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
3130 | */ | |
d62a17ae | 3131 | if (type) { |
e50f7cfd | 3132 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 3133 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 3134 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 3135 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 3136 | } |
3137 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
3138 | } |
3139 | ||
718e3744 | 3140 | /* Read attribute of update packet. This function is called from |
8b366b9c | 3141 | bgp_update_receive() in bgp_packet.c. */ |
d62a17ae | 3142 | bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, |
3143 | bgp_size_t size, struct bgp_nlri *mp_update, | |
3144 | struct bgp_nlri *mp_withdraw) | |
3145 | { | |
f7813c7c | 3146 | bgp_attr_parse_ret_t ret; |
d7c0a89a QY |
3147 | uint8_t flag = 0; |
3148 | uint8_t type = 0; | |
d62a17ae | 3149 | bgp_size_t length; |
d7c0a89a QY |
3150 | uint8_t *startp, *endp; |
3151 | uint8_t *attr_endp; | |
3152 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 3153 | /* we need the as4_path only until we have synthesized the as_path with |
3154 | * it */ | |
3155 | /* same goes for as4_aggregator */ | |
3156 | struct aspath *as4_path = NULL; | |
3157 | as_t as4_aggregator = 0; | |
3158 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
04fb21e2 | 3159 | struct transit *transit; |
d62a17ae | 3160 | |
3161 | /* Initialize bitmap. */ | |
3162 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
3163 | ||
3164 | /* End pointer of BGP attribute. */ | |
3165 | endp = BGP_INPUT_PNT(peer) + size; | |
3166 | ||
3167 | /* Get attributes to the end of attribute length. */ | |
3168 | while (BGP_INPUT_PNT(peer) < endp) { | |
3169 | /* Check remaining length check.*/ | |
3170 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
3171 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 3172 | flog_warn( |
e50f7cfd | 3173 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3174 | "%s: error BGP attribute length %lu is smaller than min len", |
3175 | peer->host, | |
3176 | (unsigned long)(endp | |
3177 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3178 | |
3179 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3180 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3181 | ret = BGP_ATTR_PARSE_ERROR; |
3182 | goto done; | |
d62a17ae | 3183 | } |
718e3744 | 3184 | |
d62a17ae | 3185 | /* Fetch attribute flag and type. */ |
3186 | startp = BGP_INPUT_PNT(peer); | |
3187 | /* "The lower-order four bits of the Attribute Flags octet are | |
3188 | unused. They MUST be zero when sent and MUST be ignored when | |
3189 | received." */ | |
3190 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
3191 | type = stream_getc(BGP_INPUT(peer)); | |
3192 | ||
3193 | /* Check whether Extended-Length applies and is in bounds */ | |
3194 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
3195 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 3196 | flog_warn( |
e50f7cfd | 3197 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3198 | "%s: Extended length set, but just %lu bytes of attr header", |
3199 | peer->host, | |
3200 | (unsigned long)(endp | |
3201 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3202 | |
3203 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3204 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3205 | ret = BGP_ATTR_PARSE_ERROR; |
3206 | goto done; | |
d62a17ae | 3207 | } |
718e3744 | 3208 | |
d62a17ae | 3209 | /* Check extended attribue length bit. */ |
3210 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
3211 | length = stream_getw(BGP_INPUT(peer)); | |
3212 | else | |
3213 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 3214 | |
d62a17ae | 3215 | /* If any attribute appears more than once in the UPDATE |
3216 | message, then the Error Subcode is set to Malformed Attribute | |
3217 | List. */ | |
718e3744 | 3218 | |
d62a17ae | 3219 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 3220 | flog_warn( |
e50f7cfd | 3221 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
3222 | "%s: error BGP attribute type %d appears twice in a message", |
3223 | peer->host, type); | |
718e3744 | 3224 | |
d62a17ae | 3225 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
3226 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3227 | ret = BGP_ATTR_PARSE_ERROR; |
3228 | goto done; | |
d62a17ae | 3229 | } |
3230 | ||
3231 | /* Set type to bitmap to check duplicate attribute. `type' is | |
3232 | unsigned char so it never overflow bitmap range. */ | |
3233 | ||
3234 | SET_BITMAP(seen, type); | |
3235 | ||
3236 | /* Overflow check. */ | |
3237 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3238 | ||
3239 | if (attr_endp > endp) { | |
ade6974d | 3240 | flog_warn( |
e50f7cfd | 3241 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3242 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3243 | peer->host, type, length, size, attr_endp, | |
3244 | endp); | |
dacffad4 QY |
3245 | /* |
3246 | * RFC 4271 6.3 | |
3247 | * If any recognized attribute has an Attribute | |
3248 | * Length that conflicts with the expected length | |
3249 | * (based on the attribute type code), then the | |
3250 | * Error Subcode MUST be set to Attribute Length | |
3251 | * Error. The Data field MUST contain the erroneous | |
3252 | * attribute (type, length, and value). | |
3253 | * ---------- | |
3254 | * We do not currently have a good way to determine the | |
3255 | * length of the attribute independent of the length | |
3256 | * received in the message. Instead we send the | |
3257 | * minimum between the amount of data we have and the | |
3258 | * amount specified by the attribute length field. | |
3259 | * | |
3260 | * Instead of directly passing in the packet buffer and | |
3261 | * offset we use the stream_get* functions to read into | |
3262 | * a stack buffer, since they perform bounds checking | |
3263 | * and we are working with untrusted data. | |
3264 | */ | |
ef56aee4 | 3265 | unsigned char ndata[peer->max_packet_size]; |
dacffad4 QY |
3266 | memset(ndata, 0x00, sizeof(ndata)); |
3267 | size_t lfl = | |
3268 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3269 | /* Rewind to end of flag field */ | |
763a5d3c | 3270 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3271 | /* Type */ |
3272 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3273 | /* Length */ | |
3274 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3275 | /* Value */ | |
3276 | size_t atl = attr_endp - startp; | |
3277 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3278 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3279 | ||
d62a17ae | 3280 | bgp_notify_send_with_data( |
3281 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3282 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3283 | ndl + lfl + 1); | |
3284 | ||
b6a171c7 QY |
3285 | ret = BGP_ATTR_PARSE_ERROR; |
3286 | goto done; | |
d62a17ae | 3287 | } |
3288 | ||
3289 | struct bgp_attr_parser_args attr_args = { | |
3290 | .peer = peer, | |
3291 | .length = length, | |
3292 | .attr = attr, | |
3293 | .type = type, | |
3294 | .flags = flag, | |
3295 | .startp = startp, | |
3296 | .total = attr_endp - startp, | |
3297 | }; | |
3298 | ||
3299 | ||
3300 | /* If any recognized attribute has Attribute Flags that conflict | |
3301 | with the Attribute Type Code, then the Error Subcode is set | |
3302 | to | |
3303 | Attribute Flags Error. The Data field contains the erroneous | |
3304 | attribute (type, length and value). */ | |
3305 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3306 | ret = bgp_attr_malformed( |
3307 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3308 | attr_args.total); | |
3309 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3310 | continue; | |
b6a171c7 | 3311 | goto done; |
d62a17ae | 3312 | } |
3313 | ||
3314 | /* OK check attribute and store it's value. */ | |
3315 | switch (type) { | |
3316 | case BGP_ATTR_ORIGIN: | |
3317 | ret = bgp_attr_origin(&attr_args); | |
3318 | break; | |
3319 | case BGP_ATTR_AS_PATH: | |
3320 | ret = bgp_attr_aspath(&attr_args); | |
3321 | break; | |
3322 | case BGP_ATTR_AS4_PATH: | |
3323 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3324 | break; | |
3325 | case BGP_ATTR_NEXT_HOP: | |
3326 | ret = bgp_attr_nexthop(&attr_args); | |
3327 | break; | |
3328 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3329 | ret = bgp_attr_med(&attr_args); | |
3330 | break; | |
3331 | case BGP_ATTR_LOCAL_PREF: | |
3332 | ret = bgp_attr_local_pref(&attr_args); | |
3333 | break; | |
3334 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3335 | ret = bgp_attr_atomic(&attr_args); | |
3336 | break; | |
3337 | case BGP_ATTR_AGGREGATOR: | |
3338 | ret = bgp_attr_aggregator(&attr_args); | |
3339 | break; | |
3340 | case BGP_ATTR_AS4_AGGREGATOR: | |
3341 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3342 | &as4_aggregator, | |
3343 | &as4_aggregator_addr); | |
3344 | break; | |
3345 | case BGP_ATTR_COMMUNITIES: | |
3346 | ret = bgp_attr_community(&attr_args); | |
3347 | break; | |
3348 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3349 | ret = bgp_attr_large_community(&attr_args); | |
3350 | break; | |
3351 | case BGP_ATTR_ORIGINATOR_ID: | |
3352 | ret = bgp_attr_originator_id(&attr_args); | |
3353 | break; | |
3354 | case BGP_ATTR_CLUSTER_LIST: | |
3355 | ret = bgp_attr_cluster_list(&attr_args); | |
3356 | break; | |
3357 | case BGP_ATTR_MP_REACH_NLRI: | |
3358 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3359 | break; | |
3360 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3361 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3362 | break; | |
3363 | case BGP_ATTR_EXT_COMMUNITIES: | |
3364 | ret = bgp_attr_ext_communities(&attr_args); | |
3365 | break; | |
1e20238a | 3366 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3367 | case BGP_ATTR_VNC: |
65efcfce | 3368 | #endif |
d62a17ae | 3369 | case BGP_ATTR_ENCAP: |
3370 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3371 | startp); | |
3372 | break; | |
3373 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3374 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3375 | break; |
7fd077aa | 3376 | case BGP_ATTR_PMSI_TUNNEL: |
3377 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3378 | break; | |
9a659715 PG |
3379 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3380 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3381 | break; | |
d62a17ae | 3382 | default: |
3383 | ret = bgp_attr_unknown(&attr_args); | |
3384 | break; | |
3385 | } | |
3386 | ||
3387 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3388 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3389 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3390 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3391 | goto done; |
d62a17ae | 3392 | } |
3393 | ||
9b9df989 | 3394 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3395 | goto done; |
9b9df989 DS |
3396 | } |
3397 | ||
d62a17ae | 3398 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3399 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3400 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3401 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3402 | goto done; |
d62a17ae | 3403 | } |
3404 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3405 | flog_warn( |
e50f7cfd | 3406 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3407 | "%s: Attribute %s, parse error - treating as withdrawal", |
3408 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3409 | goto done; |
d62a17ae | 3410 | } |
3411 | ||
3412 | /* Check the fetched length. */ | |
3413 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3414 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3415 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3416 | peer->host, lookup_msg(attr_str, type, NULL)); |
3417 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3418 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3419 | ret = BGP_ATTR_PARSE_ERROR; |
3420 | goto done; | |
d62a17ae | 3421 | } |
718e3744 | 3422 | } |
d62a17ae | 3423 | |
e5d4cda0 HS |
3424 | /* |
3425 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3426 | * About Prefix-SID path attribute, | |
3427 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3428 | * may only appear in a BGP Prefix-SID attribute attached to | |
3429 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3430 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3431 | */ | |
3432 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3433 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3434 | ||
d62a17ae | 3435 | /* Check final read pointer is same as end pointer. */ |
3436 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3437 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3438 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3439 | lookup_msg(attr_str, type, NULL)); |
3440 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3441 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3442 | |
3443 | ret = BGP_ATTR_PARSE_ERROR; | |
3444 | goto done; | |
d62a17ae | 3445 | } |
3446 | ||
88f33d66 | 3447 | /* |
3448 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3449 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3450 | * This is implemented below and will result in a NOTIFICATION. If the | |
3451 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3452 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3453 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3454 | * | |
3455 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3456 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3457 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3458 | * speaker that receives the message SHOULD ignore this attribute. | |
3459 | */ | |
3460 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3461 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3462 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3463 | ret = BGP_ATTR_PARSE_ERROR; |
3464 | goto done; | |
88f33d66 | 3465 | } |
3466 | } | |
3467 | ||
d62a17ae | 3468 | /* Check all mandatory well-known attributes are present */ |
11dbcdd3 DA |
3469 | ret = bgp_attr_check(peer, attr); |
3470 | if (ret < 0) | |
b6a171c7 | 3471 | goto done; |
d62a17ae | 3472 | |
3473 | /* | |
3474 | * At this place we can see whether we got AS4_PATH and/or | |
3475 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3476 | * We can not do this before we've read all attributes because | |
3477 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3478 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3479 | * in relationship to AGGREGATOR. | |
3480 | * So, to be defensive, we are not relying on any order and read | |
3481 | * all attributes first, including these 32bit ones, and now, | |
3482 | * afterwards, we look what and if something is to be done for as4. | |
3483 | * | |
3484 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3485 | * MP_UNREACH_NLRI. | |
3486 | */ | |
3487 | /* actually... this doesn't ever return failure currently, but | |
3488 | * better safe than sorry */ | |
3489 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3490 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3491 | &as4_aggregator_addr)) { | |
3492 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3493 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3494 | ret = BGP_ATTR_PARSE_ERROR; |
3495 | goto done; | |
d62a17ae | 3496 | } |
3497 | ||
d62a17ae | 3498 | /* |
3499 | * Finally do the checks on the aspath we did not do yet | |
3500 | * because we waited for a potentially synthesized aspath. | |
3501 | */ | |
3502 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3503 | ret = bgp_attr_aspath_check(peer, attr); | |
3504 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3505 | goto done; |
d62a17ae | 3506 | } |
718e3744 | 3507 | |
b6a171c7 | 3508 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3509 | done: |
5e0e9c09 | 3510 | |
b6a171c7 QY |
3511 | /* |
3512 | * At this stage, we have done all fiddling with as4, and the | |
3513 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3514 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3515 | * to save memory | |
3516 | */ | |
3517 | if (as4_path) { | |
3518 | /* | |
3519 | * unintern - it is in the hash | |
3520 | * The flag that we got this is still there, but that | |
3521 | * does not do any trouble | |
3522 | */ | |
3523 | aspath_unintern(&as4_path); | |
3524 | } | |
3525 | ||
04fb21e2 | 3526 | transit = bgp_attr_get_transit(attr); |
b6a171c7 QY |
3527 | if (ret != BGP_ATTR_PARSE_ERROR) { |
3528 | /* Finally intern unknown attribute. */ | |
04fb21e2 DS |
3529 | if (transit) |
3530 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
b6a171c7 QY |
3531 | if (attr->encap_subtlvs) |
3532 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3533 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3534 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3535 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3536 | bgp_attr_get_vnc_subtlvs(attr); | |
3537 | ||
3538 | if (vnc_subtlvs) | |
3539 | bgp_attr_set_vnc_subtlvs( | |
3540 | attr, | |
3541 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
5e0e9c09 QY |
3542 | #endif |
3543 | } else { | |
04fb21e2 DS |
3544 | if (transit) { |
3545 | transit_free(transit); | |
3546 | bgp_attr_set_transit(attr, NULL); | |
5e0e9c09 QY |
3547 | } |
3548 | ||
3549 | bgp_attr_flush_encap(attr); | |
3550 | }; | |
3551 | ||
3552 | /* Sanity checks */ | |
04fb21e2 DS |
3553 | transit = bgp_attr_get_transit(attr); |
3554 | if (transit) | |
3555 | assert(transit->refcnt > 0); | |
d62a17ae | 3556 | if (attr->encap_subtlvs) |
5e0e9c09 | 3557 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3558 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3559 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3560 | bgp_attr_get_vnc_subtlvs(attr); | |
3561 | ||
3562 | if (vnc_subtlvs) | |
3563 | assert(vnc_subtlvs->refcnt > 0); | |
bede7744 | 3564 | #endif |
718e3744 | 3565 | |
b6a171c7 | 3566 | return ret; |
d62a17ae | 3567 | } |
3568 | ||
f4bd90c5 LK |
3569 | /* |
3570 | * Extract the tunnel type from extended community | |
3571 | */ | |
3572 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3573 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3574 | { |
3575 | struct ecommunity *ecom; | |
f6e07e1b DS |
3576 | uint32_t i; |
3577 | ||
f4bd90c5 | 3578 | if (!attr) |
fa346686 | 3579 | return; |
f4bd90c5 LK |
3580 | |
3581 | ecom = attr->ecommunity; | |
3582 | if (!ecom || !ecom->size) | |
fa346686 | 3583 | return; |
f4bd90c5 LK |
3584 | |
3585 | for (i = 0; i < ecom->size; i++) { | |
3586 | uint8_t *pnt; | |
3587 | uint8_t type, sub_type; | |
3588 | ||
3589 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3590 | type = pnt[0]; | |
3591 | sub_type = pnt[1]; | |
3592 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3593 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3594 | continue; | |
3595 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3596 | return; |
f4bd90c5 LK |
3597 | } |
3598 | ||
fa346686 | 3599 | return; |
f4bd90c5 LK |
3600 | } |
3601 | ||
d62a17ae | 3602 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3603 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3604 | struct attr *attr) | |
3605 | { | |
3606 | size_t sizep; | |
3607 | iana_afi_t pkt_afi; | |
5c525538 | 3608 | iana_safi_t pkt_safi; |
d62a17ae | 3609 | afi_t nh_afi; |
3610 | ||
3611 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3612 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3613 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3614 | sizep = stream_get_endp(s); | |
3615 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3616 | ||
3617 | ||
3618 | /* Convert AFI, SAFI to values for packet. */ | |
3619 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3620 | ||
3621 | stream_putw(s, pkt_afi); /* AFI */ | |
3622 | stream_putc(s, pkt_safi); /* SAFI */ | |
3623 | ||
3624 | /* Nexthop AFI */ | |
ce78a6fb | 3625 | if (afi == AFI_IP |
e496b420 HS |
3626 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3627 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3628 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3629 | else if (safi == SAFI_FLOWSPEC) |
3630 | nh_afi = afi; | |
d62a17ae | 3631 | else |
3632 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3633 | ||
3634 | /* Nexthop */ | |
3635 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3636 | switch (nh_afi) { | |
3637 | case AFI_IP: | |
3638 | switch (safi) { | |
3639 | case SAFI_UNICAST: | |
3640 | case SAFI_MULTICAST: | |
3641 | case SAFI_LABELED_UNICAST: | |
3642 | stream_putc(s, 4); | |
3643 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3644 | break; | |
3645 | case SAFI_MPLS_VPN: | |
3646 | stream_putc(s, 12); | |
3647 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3648 | stream_putl(s, 0); | |
3649 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3650 | break; | |
3651 | case SAFI_ENCAP: | |
3652 | case SAFI_EVPN: | |
3653 | stream_putc(s, 4); | |
3654 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3655 | break; | |
7c40bf39 | 3656 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3657 | if (attr->mp_nexthop_len == 0) |
3658 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3659 | else { | |
3660 | stream_putc(s, attr->mp_nexthop_len); | |
3661 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3662 | } | |
d62a17ae | 3663 | default: |
3664 | break; | |
3665 | } | |
3666 | break; | |
3667 | case AFI_IP6: | |
3668 | switch (safi) { | |
3669 | case SAFI_UNICAST: | |
3670 | case SAFI_MULTICAST: | |
3671 | case SAFI_LABELED_UNICAST: | |
3672 | case SAFI_EVPN: { | |
3673 | if (attr->mp_nexthop_len | |
3674 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3675 | stream_putc(s, | |
3676 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
3677 | stream_put(s, &attr->mp_nexthop_global, | |
3678 | IPV6_MAX_BYTELEN); | |
3679 | stream_put(s, &attr->mp_nexthop_local, | |
3680 | IPV6_MAX_BYTELEN); | |
3681 | } else { | |
3682 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3683 | stream_put(s, &attr->mp_nexthop_global, | |
3684 | IPV6_MAX_BYTELEN); | |
3685 | } | |
3686 | } break; | |
3687 | case SAFI_MPLS_VPN: { | |
3688 | if (attr->mp_nexthop_len | |
3689 | == BGP_ATTR_NHLEN_IPV6_GLOBAL) { | |
3690 | stream_putc(s, 24); | |
3691 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3692 | stream_putl(s, 0); | |
3693 | stream_put(s, &attr->mp_nexthop_global, | |
3694 | IPV6_MAX_BYTELEN); | |
3695 | } else if (attr->mp_nexthop_len | |
3696 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3697 | stream_putc(s, 48); | |
3698 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3699 | stream_putl(s, 0); | |
3700 | stream_put(s, &attr->mp_nexthop_global, | |
3701 | IPV6_MAX_BYTELEN); | |
3702 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3703 | stream_putl(s, 0); | |
3704 | stream_put(s, &attr->mp_nexthop_local, | |
3705 | IPV6_MAX_BYTELEN); | |
3706 | } | |
3707 | } break; | |
3708 | case SAFI_ENCAP: | |
3709 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3710 | stream_put(s, &attr->mp_nexthop_global, | |
3711 | IPV6_MAX_BYTELEN); | |
3712 | break; | |
7c40bf39 | 3713 | case SAFI_FLOWSPEC: |
3714 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
d62a17ae | 3715 | default: |
3716 | break; | |
3717 | } | |
3718 | break; | |
8c71e481 | 3719 | default: |
a83da8e1 | 3720 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 3721 | flog_err( |
e50f7cfd | 3722 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
3723 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
3724 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 3725 | break; |
3726 | } | |
3727 | ||
3728 | /* SNPA */ | |
3729 | stream_putc(s, 0); | |
3730 | return sizep; | |
3731 | } | |
3732 | ||
3733 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
3734 | const struct prefix *p, |
3735 | const struct prefix_rd *prd, mpls_label_t *label, | |
3736 | uint32_t num_labels, int addpath_encode, | |
3737 | uint32_t addpath_tx_id, struct attr *attr) | |
d62a17ae | 3738 | { |
3739 | if (safi == SAFI_MPLS_VPN) { | |
3740 | if (addpath_encode) | |
3741 | stream_putl(s, addpath_tx_id); | |
3742 | /* Label, RD, Prefix write. */ | |
3743 | stream_putc(s, p->prefixlen + 88); | |
3744 | stream_put(s, label, BGP_LABEL_BYTES); | |
3745 | stream_put(s, prd->val, 8); | |
3746 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
3747 | } else if (afi == AFI_L2VPN && safi == SAFI_EVPN) { | |
3748 | /* EVPN prefix - contents depend on type */ | |
996c9314 LB |
3749 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr, |
3750 | addpath_encode, addpath_tx_id); | |
d62a17ae | 3751 | } else if (safi == SAFI_LABELED_UNICAST) { |
3752 | /* Prefix write with label. */ | |
ec15e1b5 QY |
3753 | stream_put_labeled_prefix(s, p, label, addpath_encode, |
3754 | addpath_tx_id); | |
7c40bf39 | 3755 | } else if (safi == SAFI_FLOWSPEC) { |
f1af8f04 PG |
3756 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
3757 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
3758 | p->u.prefix_flowspec.prefixlen); | |
d62a17ae | 3759 | } else |
3760 | stream_put_prefix_addpath(s, p, addpath_encode, addpath_tx_id); | |
3761 | } | |
3762 | ||
5f040085 DS |
3763 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
3764 | const struct prefix *p) | |
d62a17ae | 3765 | { |
3766 | int size = PSIZE(p->prefixlen); | |
3767 | if (safi == SAFI_MPLS_VPN) | |
3768 | size += 88; | |
4195afbf EDP |
3769 | else if (safi == SAFI_LABELED_UNICAST) |
3770 | size += BGP_LABEL_BYTES; | |
d62a17ae | 3771 | else if (afi == AFI_L2VPN && safi == SAFI_EVPN) |
3772 | size += 232; // TODO: Maximum possible for type-2, type-3 and | |
3773 | // type-5 | |
3774 | return size; | |
8c71e481 PM |
3775 | } |
3776 | ||
f4c89855 | 3777 | /* |
65efcfce | 3778 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 3779 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 3780 | * almost the same TLV format |
f4c89855 | 3781 | */ |
d62a17ae | 3782 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
3783 | struct stream *s, struct attr *attr, | |
3784 | uint8_t attrtype) | |
3785 | { | |
3786 | unsigned int attrlenfield = 0; | |
3787 | unsigned int attrhdrlen = 0; | |
3788 | struct bgp_attr_encap_subtlv *subtlvs; | |
3789 | struct bgp_attr_encap_subtlv *st; | |
3790 | const char *attrname; | |
3791 | ||
9d303b37 DL |
3792 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
3793 | && (!attr->encap_tunneltype | |
3794 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 3795 | return; |
3796 | ||
3797 | switch (attrtype) { | |
f4c89855 | 3798 | case BGP_ATTR_ENCAP: |
d62a17ae | 3799 | attrname = "Tunnel Encap"; |
3800 | subtlvs = attr->encap_subtlvs; | |
3801 | if (subtlvs == NULL) /* nothing to do */ | |
3802 | return; | |
3803 | /* | |
3804 | * The tunnel encap attr has an "outer" tlv. | |
3805 | * T = tunneltype, | |
3806 | * L = total length of subtlvs, | |
3807 | * V = concatenated subtlvs. | |
3808 | */ | |
3809 | attrlenfield = 2 + 2; /* T + L */ | |
3810 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
3811 | break; | |
f4c89855 | 3812 | |
1e20238a | 3813 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 3814 | case BGP_ATTR_VNC: |
d62a17ae | 3815 | attrname = "VNC"; |
91ebf12c | 3816 | subtlvs = bgp_attr_get_vnc_subtlvs(attr); |
d62a17ae | 3817 | if (subtlvs == NULL) /* nothing to do */ |
3818 | return; | |
3819 | attrlenfield = 0; /* no outer T + L */ | |
3820 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
3821 | break; | |
65efcfce LB |
3822 | #endif |
3823 | ||
f4c89855 | 3824 | default: |
d62a17ae | 3825 | assert(0); |
3826 | } | |
3827 | ||
3828 | /* compute attr length */ | |
3829 | for (st = subtlvs; st; st = st->next) { | |
3830 | attrlenfield += (attrhdrlen + st->length); | |
3831 | } | |
3832 | ||
3833 | if (attrlenfield > 0xffff) { | |
3834 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
3835 | attrname, attrlenfield); | |
3836 | return; | |
3837 | } | |
3838 | ||
3839 | if (attrlenfield > 0xff) { | |
3840 | /* 2-octet length field */ | |
996c9314 LB |
3841 | stream_putc(s, |
3842 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
3843 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 3844 | stream_putc(s, attrtype); |
3845 | stream_putw(s, attrlenfield & 0xffff); | |
3846 | } else { | |
3847 | /* 1-octet length field */ | |
3848 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
3849 | stream_putc(s, attrtype); | |
3850 | stream_putc(s, attrlenfield & 0xff); | |
3851 | } | |
3852 | ||
3853 | if (attrtype == BGP_ATTR_ENCAP) { | |
3854 | /* write outer T+L */ | |
3855 | stream_putw(s, attr->encap_tunneltype); | |
3856 | stream_putw(s, attrlenfield - 4); | |
3857 | } | |
3858 | ||
3859 | /* write each sub-tlv */ | |
3860 | for (st = subtlvs; st; st = st->next) { | |
3861 | if (attrtype == BGP_ATTR_ENCAP) { | |
3862 | stream_putc(s, st->type); | |
3863 | stream_putc(s, st->length); | |
1e20238a | 3864 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 3865 | } else { |
3866 | stream_putw(s, st->type); | |
3867 | stream_putw(s, st->length); | |
65efcfce | 3868 | #endif |
d62a17ae | 3869 | } |
3870 | stream_put(s, st->value, st->length); | |
3871 | } | |
f4c89855 | 3872 | } |
f4c89855 | 3873 | |
d62a17ae | 3874 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 3875 | { |
d62a17ae | 3876 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
3877 | the attr length */ | |
3878 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
3879 | } |
3880 | ||
3dc339cd | 3881 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
3882 | { |
3883 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
3884 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
3885 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3886 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
3887 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3888 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
3889 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3890 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
3891 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
3892 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
3893 | return true; |
3894 | return false; | |
6b5a72a3 DA |
3895 | } |
3896 | ||
718e3744 | 3897 | /* Make attribute packet. */ |
d62a17ae | 3898 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
3899 | struct stream *s, struct attr *attr, | |
3900 | struct bpacket_attr_vec_arr *vecarr, | |
3901 | struct prefix *p, afi_t afi, safi_t safi, | |
3902 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a QY |
3903 | mpls_label_t *label, uint32_t num_labels, |
3904 | int addpath_encode, uint32_t addpath_tx_id) | |
d62a17ae | 3905 | { |
3906 | size_t cp; | |
3907 | size_t aspath_sizep; | |
3908 | struct aspath *aspath; | |
3909 | int send_as4_path = 0; | |
3910 | int send_as4_aggregator = 0; | |
8cff42ad DA |
3911 | bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
3912 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV); | |
d62a17ae | 3913 | |
3914 | if (!bgp) | |
3915 | bgp = peer->bgp; | |
3916 | ||
3917 | /* Remember current pointer. */ | |
3918 | cp = stream_get_endp(s); | |
3919 | ||
3920 | if (p | |
3921 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
3922 | && !peer_cap_enhe(peer, afi, safi))) { | |
3923 | size_t mpattrlen_pos = 0; | |
3924 | ||
3925 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
3926 | vecarr, attr); | |
996c9314 LB |
3927 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
3928 | num_labels, addpath_encode, | |
3929 | addpath_tx_id, attr); | |
d62a17ae | 3930 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 3931 | } |
d62a17ae | 3932 | |
3933 | /* Origin attribute. */ | |
3934 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
3935 | stream_putc(s, BGP_ATTR_ORIGIN); | |
3936 | stream_putc(s, 1); | |
3937 | stream_putc(s, attr->origin); | |
3938 | ||
3939 | /* AS path attribute. */ | |
3940 | ||
3941 | /* If remote-peer is EBGP */ | |
3942 | if (peer->sort == BGP_PEER_EBGP | |
3943 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3944 | PEER_FLAG_AS_PATH_UNCHANGED) | |
3945 | || attr->aspath->segments == NULL) | |
3946 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
3947 | PEER_FLAG_RSERVER_CLIENT))) { | |
3948 | aspath = aspath_dup(attr->aspath); | |
3949 | ||
3950 | /* Even though we may not be configured for confederations we | |
3951 | * may have | |
3952 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
3953 | aspath = aspath_delete_confed_seq(aspath); | |
3954 | ||
3955 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
3956 | /* Stuff our path CONFED_ID on the front */ | |
3957 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
3958 | } else { | |
3959 | if (peer->change_local_as) { | |
3960 | /* If replace-as is specified, we only use the | |
3961 | change_local_as when | |
3962 | advertising routes. */ | |
6b5a72a3 DA |
3963 | if (!CHECK_FLAG(peer->flags, |
3964 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
3965 | if (bgp_append_local_as(peer, afi, | |
3966 | safi)) | |
3967 | aspath = aspath_add_seq( | |
3968 | aspath, peer->local_as); | |
d62a17ae | 3969 | aspath = aspath_add_seq(aspath, |
3970 | peer->change_local_as); | |
3971 | } else { | |
3972 | aspath = aspath_add_seq(aspath, peer->local_as); | |
3973 | } | |
3974 | } | |
3975 | } else if (peer->sort == BGP_PEER_CONFED) { | |
3976 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
3977 | * thing */ | |
3978 | aspath = aspath_dup(attr->aspath); | |
3979 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
3980 | } else | |
3981 | aspath = attr->aspath; | |
3982 | ||
3983 | /* If peer is not AS4 capable, then: | |
3984 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
3985 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
3986 | * segment | |
3987 | * types are in it (i.e. exclude them if they are there) | |
3988 | * AND do this only if there is at least one asnum > 65535 in the | |
3989 | * path! | |
3990 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
3991 | * change | |
3992 | * all ASnums > 65535 to BGP_AS_TRANS | |
3993 | */ | |
3994 | ||
3995 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
3996 | stream_putc(s, BGP_ATTR_AS_PATH); | |
3997 | aspath_sizep = stream_get_endp(s); | |
3998 | stream_putw(s, 0); | |
3999 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
4000 | ||
4001 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
4002 | * in the path | |
4003 | */ | |
4004 | if (!use32bit && aspath_has_as4(aspath)) | |
4005 | send_as4_path = | |
4006 | 1; /* we'll do this later, at the correct place */ | |
4007 | ||
4008 | /* Nexthop attribute. */ | |
4009 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
4010 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
4011 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
4012 | ||
d62a17ae | 4013 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
4014 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4015 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4016 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4017 | attr); | |
4018 | stream_putc(s, 4); | |
4019 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
4020 | } else if (peer_cap_enhe(from, afi, safi) |
4021 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 4022 | /* |
4023 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
4024 | * received with Extended Next-hop capability in this |
4025 | * or another vrf and is now being advertised to | |
4026 | * non-ENHE peers. Since peer_cap_enhe only checks | |
4027 | * peers in this vrf, also check the nh_afi to catch | |
4028 | * the case where the originator was in another vrf. | |
d62a17ae | 4029 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
4030 | * to enable implicit next-hop self with correct A-F |
4031 | * (ipv4 address family). | |
d62a17ae | 4032 | */ |
4033 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4034 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4035 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4036 | NULL); | |
4037 | stream_putc(s, 4); | |
4038 | stream_put_ipv4(s, 0); | |
4039 | } | |
718e3744 | 4040 | } |
d62a17ae | 4041 | |
4042 | /* MED attribute. */ | |
4043 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
4044 | || bgp->maxmed_active) { | |
4045 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4046 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4047 | stream_putc(s, 4); | |
4048 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
4049 | : attr->med)); | |
4050 | } | |
4051 | ||
4052 | /* Local preference. */ | |
4053 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
4054 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4055 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4056 | stream_putc(s, 4); | |
4057 | stream_putl(s, attr->local_pref); | |
4058 | } | |
4059 | ||
4060 | /* Atomic aggregate. */ | |
4061 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4062 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4063 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4064 | stream_putc(s, 0); | |
4065 | } | |
4066 | ||
4067 | /* Aggregator. */ | |
4068 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4069 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
4070 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4071 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4072 | ||
4073 | if (use32bit) { | |
4074 | /* AS4 capable peer */ | |
4075 | stream_putc(s, 8); | |
4076 | stream_putl(s, attr->aggregator_as); | |
4077 | } else { | |
4078 | /* 2-byte AS peer */ | |
4079 | stream_putc(s, 6); | |
4080 | ||
4081 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
4082 | * used? */ | |
48e1932b | 4083 | if (attr->aggregator_as > UINT16_MAX) { |
d62a17ae | 4084 | stream_putw(s, BGP_AS_TRANS); |
4085 | ||
4086 | /* we have to send AS4_AGGREGATOR, too. | |
4087 | * we'll do that later in order to send | |
4088 | * attributes in ascending | |
4089 | * order. | |
4090 | */ | |
4091 | send_as4_aggregator = 1; | |
4092 | } else | |
d7c0a89a | 4093 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 4094 | } |
4095 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4096 | } | |
4097 | ||
4098 | /* Community attribute. */ | |
4099 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
4100 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
4101 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4102 | stream_putc(s, |
4103 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4104 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4105 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4106 | stream_putw(s, attr->community->size * 4); | |
4107 | } else { | |
996c9314 LB |
4108 | stream_putc(s, |
4109 | BGP_ATTR_FLAG_OPTIONAL | |
4110 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4111 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4112 | stream_putc(s, attr->community->size * 4); | |
4372df71 | 4113 | } |
d62a17ae | 4114 | stream_put(s, attr->community->val, attr->community->size * 4); |
4115 | } | |
4116 | ||
4117 | /* | |
4118 | * Large Community attribute. | |
4119 | */ | |
4120 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
4121 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
4122 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
79dab4b7 | 4123 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4124 | stream_putc(s, |
4125 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4126 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4127 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4128 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4129 | } else { |
996c9314 LB |
4130 | stream_putc(s, |
4131 | BGP_ATTR_FLAG_OPTIONAL | |
4132 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4133 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4134 | stream_putc(s, lcom_length(attr->lcommunity)); |
4372df71 | 4135 | } |
d62a17ae | 4136 | stream_put(s, attr->lcommunity->val, |
79dab4b7 | 4137 | lcom_length(attr->lcommunity)); |
d62a17ae | 4138 | } |
4372df71 | 4139 | |
d62a17ae | 4140 | /* Route Reflector. */ |
4141 | if (peer->sort == BGP_PEER_IBGP && from | |
4142 | && from->sort == BGP_PEER_IBGP) { | |
779fee93 DS |
4143 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); |
4144 | ||
d62a17ae | 4145 | /* Originator ID. */ |
4146 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4147 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
4148 | stream_putc(s, 4); | |
4149 | ||
4150 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
4151 | stream_put_in_addr(s, &attr->originator_id); | |
4152 | else | |
4153 | stream_put_in_addr(s, &from->remote_id); | |
4154 | ||
4155 | /* Cluster list. */ | |
4156 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4157 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
4158 | ||
779fee93 DS |
4159 | if (cluster) { |
4160 | stream_putc(s, cluster->length + 4); | |
d62a17ae | 4161 | /* If this peer configuration's parent BGP has |
4162 | * cluster_id. */ | |
4163 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4164 | stream_put_in_addr(s, &bgp->cluster_id); | |
4165 | else | |
4166 | stream_put_in_addr(s, &bgp->router_id); | |
779fee93 | 4167 | stream_put(s, cluster->list, cluster->length); |
d62a17ae | 4168 | } else { |
4169 | stream_putc(s, 4); | |
4170 | /* If this peer configuration's parent BGP has | |
4171 | * cluster_id. */ | |
4172 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4173 | stream_put_in_addr(s, &bgp->cluster_id); | |
4174 | else | |
4175 | stream_put_in_addr(s, &bgp->router_id); | |
4176 | } | |
4177 | } | |
4372df71 | 4178 | |
d62a17ae | 4179 | /* Extended Communities attribute. */ |
4180 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
4181 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
4182 | if (peer->sort == BGP_PEER_IBGP | |
4183 | || peer->sort == BGP_PEER_CONFED) { | |
4184 | if (attr->ecommunity->size * 8 > 255) { | |
996c9314 LB |
4185 | stream_putc(s, |
4186 | BGP_ATTR_FLAG_OPTIONAL | |
4187 | | BGP_ATTR_FLAG_TRANS | |
4188 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4189 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
4190 | stream_putw(s, attr->ecommunity->size * 8); | |
4191 | } else { | |
996c9314 LB |
4192 | stream_putc(s, |
4193 | BGP_ATTR_FLAG_OPTIONAL | |
4194 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4195 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
4196 | stream_putc(s, attr->ecommunity->size * 8); | |
4197 | } | |
4198 | stream_put(s, attr->ecommunity->val, | |
4199 | attr->ecommunity->size * 8); | |
4200 | } else { | |
d7c0a89a | 4201 | uint8_t *pnt; |
d62a17ae | 4202 | int tbit; |
4203 | int ecom_tr_size = 0; | |
f6e07e1b | 4204 | uint32_t i; |
d62a17ae | 4205 | |
4206 | for (i = 0; i < attr->ecommunity->size; i++) { | |
4207 | pnt = attr->ecommunity->val + (i * 8); | |
4208 | tbit = *pnt; | |
4209 | ||
4210 | if (CHECK_FLAG(tbit, | |
4211 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4212 | continue; | |
4213 | ||
4214 | ecom_tr_size++; | |
4215 | } | |
4216 | ||
4217 | if (ecom_tr_size) { | |
4218 | if (ecom_tr_size * 8 > 255) { | |
4219 | stream_putc( | |
4220 | s, | |
4221 | BGP_ATTR_FLAG_OPTIONAL | |
4222 | | BGP_ATTR_FLAG_TRANS | |
4223 | | BGP_ATTR_FLAG_EXTLEN); | |
4224 | stream_putc(s, | |
4225 | BGP_ATTR_EXT_COMMUNITIES); | |
4226 | stream_putw(s, ecom_tr_size * 8); | |
4227 | } else { | |
4228 | stream_putc( | |
4229 | s, | |
4230 | BGP_ATTR_FLAG_OPTIONAL | |
4231 | | BGP_ATTR_FLAG_TRANS); | |
4232 | stream_putc(s, | |
4233 | BGP_ATTR_EXT_COMMUNITIES); | |
4234 | stream_putc(s, ecom_tr_size * 8); | |
4235 | } | |
4236 | ||
4237 | for (i = 0; i < attr->ecommunity->size; i++) { | |
4238 | pnt = attr->ecommunity->val + (i * 8); | |
4239 | tbit = *pnt; | |
4240 | ||
4241 | if (CHECK_FLAG( | |
4242 | tbit, | |
4243 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4244 | continue; | |
4245 | ||
4246 | stream_put(s, pnt, 8); | |
4247 | } | |
4248 | } | |
4249 | } | |
4250 | } | |
4372df71 | 4251 | |
d62a17ae | 4252 | /* Label index attribute. */ |
4253 | if (safi == SAFI_LABELED_UNICAST) { | |
4254 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4255 | uint32_t label_index; |
d62a17ae | 4256 | |
4257 | label_index = attr->label_index; | |
4258 | ||
4259 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4260 | stream_putc(s, |
4261 | BGP_ATTR_FLAG_OPTIONAL | |
4262 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4263 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4264 | stream_putc(s, 10); | |
4265 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4266 | stream_putw(s, | |
4267 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4268 | stream_putc(s, 0); // reserved | |
4269 | stream_putw(s, 0); // flags | |
4270 | stream_putl(s, label_index); | |
4271 | } | |
4372df71 | 4272 | } |
d62a17ae | 4273 | } |
4274 | ||
e496b420 | 4275 | /* SRv6 Service Information Attribute. */ |
dbcf19b8 | 4276 | if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) { |
e496b420 | 4277 | if (attr->srv6_l3vpn) { |
a3e3b5b0 | 4278 | uint8_t subtlv_len = |
a1a51008 RS |
4279 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH |
4280 | + BGP_ATTR_MIN_LEN | |
4281 | + BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH; | |
4282 | uint8_t tlv_len = subtlv_len + BGP_ATTR_MIN_LEN + 1; | |
4283 | uint8_t attr_len = tlv_len + BGP_ATTR_MIN_LEN; | |
e496b420 HS |
4284 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
4285 | | BGP_ATTR_FLAG_TRANS); | |
4286 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
a1a51008 | 4287 | stream_putc(s, attr_len); |
e496b420 | 4288 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); |
a1a51008 | 4289 | stream_putw(s, tlv_len); |
a3e3b5b0 RS |
4290 | stream_putc(s, 0); /* reserved */ |
4291 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO); | |
a1a51008 | 4292 | stream_putw(s, subtlv_len); |
e496b420 HS |
4293 | stream_putc(s, 0); /* reserved */ |
4294 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4295 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4296 | stream_putc(s, 0); /* sid_flags */ | |
4297 | stream_putw(s, 0xffff); /* endpoint */ | |
4298 | stream_putc(s, 0); /* reserved */ | |
a1a51008 RS |
4299 | stream_putc( |
4300 | s, | |
4301 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE); | |
4302 | stream_putw( | |
4303 | s, | |
4304 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH); | |
4305 | stream_putc(s, attr->srv6_l3vpn->loc_block_len); | |
4306 | stream_putc(s, attr->srv6_l3vpn->loc_node_len); | |
4307 | stream_putc(s, attr->srv6_l3vpn->func_len); | |
4308 | stream_putc(s, attr->srv6_l3vpn->arg_len); | |
4309 | stream_putc(s, attr->srv6_l3vpn->transposition_len); | |
4310 | stream_putc(s, attr->srv6_l3vpn->transposition_offset); | |
e496b420 HS |
4311 | } else if (attr->srv6_vpn) { |
4312 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4313 | | BGP_ATTR_FLAG_TRANS); | |
4314 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4315 | stream_putc(s, 22); /* tlv len */ | |
4316 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4317 | stream_putw(s, 0x13); /* tlv len */ | |
4318 | stream_putc(s, 0x00); /* reserved */ | |
4319 | stream_putc(s, 0x01); /* sid_type */ | |
4320 | stream_putc(s, 0x00); /* sif_flags */ | |
4321 | stream_put(s, &attr->srv6_vpn->sid, | |
4322 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4323 | } | |
4324 | } | |
4325 | ||
d62a17ae | 4326 | if (send_as4_path) { |
4327 | /* If the peer is NOT As4 capable, AND */ | |
4328 | /* there are ASnums > 65535 in path THEN | |
4329 | * give out AS4_PATH */ | |
4330 | ||
4331 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4332 | * path segments! | |
4333 | * Hm, I wonder... confederation things *should* only be at | |
4334 | * the beginning of an aspath, right? Then we should use | |
4335 | * aspath_delete_confed_seq for this, because it is already | |
4336 | * there! (JK) | |
4337 | * Folks, talk to me: what is reasonable here!? | |
4338 | */ | |
4339 | aspath = aspath_delete_confed_seq(aspath); | |
4340 | ||
996c9314 LB |
4341 | stream_putc(s, |
4342 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4343 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4344 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4345 | aspath_sizep = stream_get_endp(s); | |
4346 | stream_putw(s, 0); | |
4347 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4348 | } | |
4349 | ||
4350 | if (aspath != attr->aspath) | |
4351 | aspath_free(aspath); | |
4352 | ||
4353 | if (send_as4_aggregator) { | |
4354 | /* send AS4_AGGREGATOR, at this place */ | |
4355 | /* this section of code moved here in order to ensure the | |
4356 | * correct | |
4357 | * *ascending* order of attributes | |
4358 | */ | |
4359 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4360 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4361 | stream_putc(s, 8); | |
4362 | stream_putl(s, attr->aggregator_as); | |
4363 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4364 | } | |
4365 | ||
4366 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4367 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4368 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4369 | /* Tunnel Encap attribute */ | |
4370 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4371 | |
1e20238a | 4372 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4373 | /* VNC attribute */ |
4374 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4375 | #endif |
d62a17ae | 4376 | } |
587ff0fd | 4377 | |
a21bd7a3 DW |
4378 | /* PMSI Tunnel */ |
4379 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4380 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4381 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4382 | stream_putc(s, 9); // Length | |
4383 | stream_putc(s, 0); // Flags | |
2a3f51cf | 4384 | stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr)); |
996c9314 LB |
4385 | stream_put(s, &(attr->label), |
4386 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4387 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4388 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4389 | } |
4390 | ||
d62a17ae | 4391 | /* Unknown transit attribute. */ |
04fb21e2 DS |
4392 | struct transit *transit = bgp_attr_get_transit(attr); |
4393 | ||
4394 | if (transit) | |
4395 | stream_put(s, transit->val, transit->length); | |
718e3744 | 4396 | |
d62a17ae | 4397 | /* Return total size of attribute. */ |
4398 | return stream_get_endp(s) - cp; | |
718e3744 | 4399 | } |
4400 | ||
d62a17ae | 4401 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4402 | { |
d62a17ae | 4403 | unsigned long attrlen_pnt; |
4404 | iana_afi_t pkt_afi; | |
5c525538 | 4405 | iana_safi_t pkt_safi; |
718e3744 | 4406 | |
d62a17ae | 4407 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4408 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4409 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4410 | |
d62a17ae | 4411 | attrlen_pnt = stream_get_endp(s); |
4412 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4413 | |
d62a17ae | 4414 | /* Convert AFI, SAFI to values for packet. */ |
4415 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4416 | |
d62a17ae | 4417 | stream_putw(s, pkt_afi); |
4418 | stream_putc(s, pkt_safi); | |
9cabb64b | 4419 | |
d62a17ae | 4420 | return attrlen_pnt; |
8c71e481 | 4421 | } |
718e3744 | 4422 | |
5f040085 DS |
4423 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4424 | afi_t afi, safi_t safi, | |
4425 | const struct prefix_rd *prd, | |
d7c0a89a QY |
4426 | mpls_label_t *label, uint32_t num_labels, |
4427 | int addpath_encode, uint32_t addpath_tx_id, | |
b57ba6d2 | 4428 | struct attr *attr) |
8c71e481 | 4429 | { |
d7c0a89a | 4430 | uint8_t wlabel[3] = {0x80, 0x00, 0x00}; |
cd1964ff | 4431 | |
b57ba6d2 | 4432 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4433 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4434 | num_labels = 1; |
4435 | } | |
cd1964ff | 4436 | |
d90b788e A |
4437 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
4438 | addpath_encode, addpath_tx_id, attr); | |
8c71e481 | 4439 | } |
718e3744 | 4440 | |
d62a17ae | 4441 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4442 | { |
d62a17ae | 4443 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4444 | } |
4445 | ||
4446 | /* Initialization of attribute. */ | |
d62a17ae | 4447 | void bgp_attr_init(void) |
718e3744 | 4448 | { |
d62a17ae | 4449 | aspath_init(); |
4450 | attrhash_init(); | |
4451 | community_init(); | |
4452 | ecommunity_init(); | |
4453 | lcommunity_init(); | |
4454 | cluster_init(); | |
4455 | transit_init(); | |
4456 | encap_init(); | |
e496b420 | 4457 | srv6_init(); |
718e3744 | 4458 | } |
4459 | ||
d62a17ae | 4460 | void bgp_attr_finish(void) |
228da428 | 4461 | { |
d62a17ae | 4462 | aspath_finish(); |
4463 | attrhash_finish(); | |
4464 | community_finish(); | |
4465 | ecommunity_finish(); | |
4466 | lcommunity_finish(); | |
4467 | cluster_finish(); | |
4468 | transit_finish(); | |
4469 | encap_finish(); | |
e496b420 | 4470 | srv6_finish(); |
228da428 CC |
4471 | } |
4472 | ||
718e3744 | 4473 | /* Make attribute packet. */ |
d62a17ae | 4474 | void bgp_dump_routes_attr(struct stream *s, struct attr *attr, |
bd494ec5 | 4475 | const struct prefix *prefix) |
d62a17ae | 4476 | { |
4477 | unsigned long cp; | |
4478 | unsigned long len; | |
4479 | size_t aspath_lenp; | |
4480 | struct aspath *aspath; | |
4481 | int addpath_encode = 0; | |
d7c0a89a | 4482 | uint32_t addpath_tx_id = 0; |
d62a17ae | 4483 | |
4484 | /* Remember current pointer. */ | |
4485 | cp = stream_get_endp(s); | |
4486 | ||
4487 | /* Place holder of length. */ | |
4488 | stream_putw(s, 0); | |
4489 | ||
4490 | /* Origin attribute. */ | |
4491 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4492 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4493 | stream_putc(s, 1); | |
4494 | stream_putc(s, attr->origin); | |
4495 | ||
4496 | aspath = attr->aspath; | |
4497 | ||
4498 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4499 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4500 | aspath_lenp = stream_get_endp(s); | |
4501 | stream_putw(s, 0); | |
4502 | ||
4503 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4504 | ||
4505 | /* Nexthop attribute. */ | |
4506 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4507 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4508 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4509 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4510 | stream_putc(s, 4); | |
4511 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4512 | } |
d62a17ae | 4513 | |
4514 | /* MED attribute. */ | |
4515 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4516 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4517 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4518 | stream_putc(s, 4); | |
4519 | stream_putl(s, attr->med); | |
4520 | } | |
4521 | ||
4522 | /* Local preference. */ | |
4523 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4524 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4525 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4526 | stream_putc(s, 4); | |
4527 | stream_putl(s, attr->local_pref); | |
4528 | } | |
4529 | ||
4530 | /* Atomic aggregate. */ | |
4531 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4532 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4533 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4534 | stream_putc(s, 0); | |
4535 | } | |
4536 | ||
4537 | /* Aggregator. */ | |
4538 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4539 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4540 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4541 | stream_putc(s, 8); | |
4542 | stream_putl(s, attr->aggregator_as); | |
4543 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4544 | } | |
4545 | ||
4546 | /* Community attribute. */ | |
4547 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
4548 | if (attr->community->size * 4 > 255) { | |
996c9314 LB |
4549 | stream_putc(s, |
4550 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4551 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4552 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4553 | stream_putw(s, attr->community->size * 4); | |
4554 | } else { | |
996c9314 LB |
4555 | stream_putc(s, |
4556 | BGP_ATTR_FLAG_OPTIONAL | |
4557 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4558 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
4559 | stream_putc(s, attr->community->size * 4); | |
4560 | } | |
4561 | stream_put(s, attr->community->val, attr->community->size * 4); | |
4562 | } | |
4563 | ||
4564 | /* Large Community attribute. */ | |
4565 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
79dab4b7 | 4566 | if (lcom_length(attr->lcommunity) > 255) { |
996c9314 LB |
4567 | stream_putc(s, |
4568 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4569 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4570 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4571 | stream_putw(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4572 | } else { |
996c9314 LB |
4573 | stream_putc(s, |
4574 | BGP_ATTR_FLAG_OPTIONAL | |
4575 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4576 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
79dab4b7 | 4577 | stream_putc(s, lcom_length(attr->lcommunity)); |
d62a17ae | 4578 | } |
4579 | ||
996c9314 LB |
4580 | stream_put(s, attr->lcommunity->val, |
4581 | lcom_length(attr->lcommunity)); | |
d62a17ae | 4582 | } |
4583 | ||
4584 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
4585 | if (prefix != NULL && prefix->family == AF_INET6 | |
4586 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
4587 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
4588 | int sizep; | |
4589 | ||
4590 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4591 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
4592 | sizep = stream_get_endp(s); | |
4593 | ||
4594 | /* MP header */ | |
4595 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
4596 | stream_putw(s, AFI_IP6); /* AFI */ | |
4597 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
4598 | ||
4599 | /* Next hop */ | |
4600 | stream_putc(s, attr->mp_nexthop_len); | |
4601 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
4602 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
4603 | stream_put(s, &attr->mp_nexthop_local, | |
4604 | IPV6_MAX_BYTELEN); | |
4605 | ||
4606 | /* SNPA */ | |
4607 | stream_putc(s, 0); | |
4608 | ||
4609 | /* Prefix */ | |
4610 | stream_put_prefix_addpath(s, prefix, addpath_encode, | |
4611 | addpath_tx_id); | |
4612 | ||
4613 | /* Set MP attribute length. */ | |
4614 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
4615 | } | |
4616 | ||
4617 | /* Prefix SID */ | |
4618 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
4619 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4620 | stream_putc(s, |
4621 | BGP_ATTR_FLAG_OPTIONAL | |
4622 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4623 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4624 | stream_putc(s, 10); | |
4625 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4626 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4627 | stream_putc(s, 0); // reserved | |
4628 | stream_putw(s, 0); // flags | |
4629 | stream_putl(s, attr->label_index); | |
4630 | } | |
4631 | } | |
4632 | ||
4633 | /* Return total size of attribute. */ | |
4634 | len = stream_get_endp(s) - cp - 2; | |
4635 | stream_putw_at(s, cp, len); | |
718e3744 | 4636 | } |