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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
718e3744 | 2 | /* BGP attributes management routines. |
896014f4 | 3 | * Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro |
896014f4 | 4 | */ |
718e3744 | 5 | |
6 | #include <zebra.h> | |
7 | ||
8 | #include "linklist.h" | |
9 | #include "prefix.h" | |
10 | #include "memory.h" | |
11 | #include "vector.h" | |
718e3744 | 12 | #include "stream.h" |
13 | #include "log.h" | |
14 | #include "hash.h" | |
c8e7b895 | 15 | #include "jhash.h" |
3f9c7369 | 16 | #include "queue.h" |
f4c89855 | 17 | #include "table.h" |
039f3a34 | 18 | #include "filter.h" |
4dcadbef | 19 | #include "command.h" |
e496b420 | 20 | #include "srv6.h" |
a5c6a9b1 | 21 | #include "frrstr.h" |
718e3744 | 22 | |
23 | #include "bgpd/bgpd.h" | |
24 | #include "bgpd/bgp_attr.h" | |
25 | #include "bgpd/bgp_route.h" | |
26 | #include "bgpd/bgp_aspath.h" | |
27 | #include "bgpd/bgp_community.h" | |
28 | #include "bgpd/bgp_debug.h" | |
14454c9f | 29 | #include "bgpd/bgp_errors.h" |
9bedbb1e | 30 | #include "bgpd/bgp_label.h" |
718e3744 | 31 | #include "bgpd/bgp_packet.h" |
32 | #include "bgpd/bgp_ecommunity.h" | |
57d187bc | 33 | #include "bgpd/bgp_lcommunity.h" |
3f9c7369 | 34 | #include "bgpd/bgp_updgrp.h" |
6407da5a | 35 | #include "bgpd/bgp_encap_types.h" |
1e20238a | 36 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 37 | #include "bgpd/rfapi/bgp_rfapi_cfg.h" |
38 | #include "bgp_encap_types.h" | |
39 | #include "bgp_vnc_types.h" | |
65efcfce | 40 | #endif |
b18825eb | 41 | #include "bgp_evpn.h" |
7c40bf39 | 42 | #include "bgp_flowspec_private.h" |
eee353c5 | 43 | #include "bgp_mac.h" |
6b0655a2 | 44 | |
718e3744 | 45 | /* Attribute strings for logging. */ |
d62a17ae | 46 | static const struct message attr_str[] = { |
47 | {BGP_ATTR_ORIGIN, "ORIGIN"}, | |
48 | {BGP_ATTR_AS_PATH, "AS_PATH"}, | |
49 | {BGP_ATTR_NEXT_HOP, "NEXT_HOP"}, | |
50 | {BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC"}, | |
51 | {BGP_ATTR_LOCAL_PREF, "LOCAL_PREF"}, | |
52 | {BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE"}, | |
53 | {BGP_ATTR_AGGREGATOR, "AGGREGATOR"}, | |
54 | {BGP_ATTR_COMMUNITIES, "COMMUNITY"}, | |
55 | {BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID"}, | |
56 | {BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST"}, | |
d62a17ae | 57 | {BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI"}, |
58 | {BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI"}, | |
59 | {BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES"}, | |
60 | {BGP_ATTR_AS4_PATH, "AS4_PATH"}, | |
61 | {BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR"}, | |
a21bd7a3 | 62 | {BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"}, |
d62a17ae | 63 | {BGP_ATTR_ENCAP, "ENCAP"}, |
d864dd9e | 64 | {BGP_ATTR_OTC, "OTC"}, |
1e20238a | 65 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 66 | {BGP_ATTR_VNC, "VNC"}, |
65efcfce | 67 | #endif |
d62a17ae | 68 | {BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"}, |
69 | {BGP_ATTR_PREFIX_SID, "PREFIX_SID"}, | |
9a659715 | 70 | {BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"}, |
97a52c82 | 71 | {BGP_ATTR_AIGP, "AIGP"}, |
d62a17ae | 72 | {0}}; |
afcb7679 | 73 | |
996c9314 LB |
74 | static const struct message attr_flag_str[] = { |
75 | {BGP_ATTR_FLAG_OPTIONAL, "Optional"}, | |
76 | {BGP_ATTR_FLAG_TRANS, "Transitive"}, | |
77 | {BGP_ATTR_FLAG_PARTIAL, "Partial"}, | |
78 | /* bgp_attr_flags_diagnose() relies on this bit being last in | |
79 | this list */ | |
80 | {BGP_ATTR_FLAG_EXTLEN, "Extended Length"}, | |
81 | {0}}; | |
6b0655a2 | 82 | |
9bddac4b | 83 | static struct hash *cluster_hash; |
718e3744 | 84 | |
d62a17ae | 85 | static void *cluster_hash_alloc(void *p) |
718e3744 | 86 | { |
d62a17ae | 87 | const struct cluster_list *val = (const struct cluster_list *)p; |
88 | struct cluster_list *cluster; | |
718e3744 | 89 | |
d62a17ae | 90 | cluster = XMALLOC(MTYPE_CLUSTER, sizeof(struct cluster_list)); |
91 | cluster->length = val->length; | |
718e3744 | 92 | |
d62a17ae | 93 | if (cluster->length) { |
94 | cluster->list = XMALLOC(MTYPE_CLUSTER_VAL, val->length); | |
95 | memcpy(cluster->list, val->list, val->length); | |
96 | } else | |
97 | cluster->list = NULL; | |
718e3744 | 98 | |
d62a17ae | 99 | cluster->refcnt = 0; |
718e3744 | 100 | |
d62a17ae | 101 | return cluster; |
718e3744 | 102 | } |
103 | ||
104 | /* Cluster list related functions. */ | |
d62a17ae | 105 | static struct cluster_list *cluster_parse(struct in_addr *pnt, int length) |
718e3744 | 106 | { |
628565c7 | 107 | struct cluster_list tmp = {}; |
d62a17ae | 108 | struct cluster_list *cluster; |
718e3744 | 109 | |
d62a17ae | 110 | tmp.length = length; |
628565c7 | 111 | tmp.list = length == 0 ? NULL : pnt; |
718e3744 | 112 | |
d62a17ae | 113 | cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc); |
114 | cluster->refcnt++; | |
115 | return cluster; | |
718e3744 | 116 | } |
117 | ||
3dc339cd | 118 | bool cluster_loop_check(struct cluster_list *cluster, struct in_addr originator) |
718e3744 | 119 | { |
d62a17ae | 120 | int i; |
121 | ||
122 | for (i = 0; i < cluster->length / 4; i++) | |
123 | if (cluster->list[i].s_addr == originator.s_addr) | |
3dc339cd DA |
124 | return true; |
125 | return false; | |
718e3744 | 126 | } |
127 | ||
d8b87afe | 128 | static unsigned int cluster_hash_key_make(const void *p) |
718e3744 | 129 | { |
d62a17ae | 130 | const struct cluster_list *cluster = p; |
718e3744 | 131 | |
d62a17ae | 132 | return jhash(cluster->list, cluster->length, 0); |
718e3744 | 133 | } |
134 | ||
74df8d6d | 135 | static bool cluster_hash_cmp(const void *p1, const void *p2) |
718e3744 | 136 | { |
d62a17ae | 137 | const struct cluster_list *cluster1 = p1; |
138 | const struct cluster_list *cluster2 = p2; | |
923de654 | 139 | |
f22ed884 QY |
140 | if (cluster1->list == cluster2->list) |
141 | return true; | |
142 | ||
143 | if (!cluster1->list || !cluster2->list) | |
144 | return false; | |
145 | ||
146 | if (cluster1->length != cluster2->length) | |
147 | return false; | |
148 | ||
149 | return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0); | |
718e3744 | 150 | } |
151 | ||
d62a17ae | 152 | static void cluster_free(struct cluster_list *cluster) |
718e3744 | 153 | { |
0a22ddfb | 154 | XFREE(MTYPE_CLUSTER_VAL, cluster->list); |
d62a17ae | 155 | XFREE(MTYPE_CLUSTER, cluster); |
718e3744 | 156 | } |
157 | ||
d62a17ae | 158 | static struct cluster_list *cluster_intern(struct cluster_list *cluster) |
718e3744 | 159 | { |
d62a17ae | 160 | struct cluster_list *find; |
718e3744 | 161 | |
d62a17ae | 162 | find = hash_get(cluster_hash, cluster, cluster_hash_alloc); |
163 | find->refcnt++; | |
718e3744 | 164 | |
d62a17ae | 165 | return find; |
718e3744 | 166 | } |
167 | ||
628565c7 | 168 | static void cluster_unintern(struct cluster_list **cluster) |
718e3744 | 169 | { |
628565c7 QY |
170 | if ((*cluster)->refcnt) |
171 | (*cluster)->refcnt--; | |
172 | ||
173 | if ((*cluster)->refcnt == 0) { | |
174 | void *p = hash_release(cluster_hash, *cluster); | |
175 | assert(p == *cluster); | |
176 | cluster_free(*cluster); | |
177 | *cluster = NULL; | |
d62a17ae | 178 | } |
718e3744 | 179 | } |
180 | ||
d62a17ae | 181 | static void cluster_init(void) |
718e3744 | 182 | { |
996c9314 | 183 | cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp, |
3f65c5b1 | 184 | "BGP Cluster"); |
718e3744 | 185 | } |
228da428 | 186 | |
d62a17ae | 187 | static void cluster_finish(void) |
228da428 | 188 | { |
d8bc11a5 | 189 | hash_clean_and_free(&cluster_hash, (void (*)(void *))cluster_free); |
228da428 | 190 | } |
6b0655a2 | 191 | |
bede7744 | 192 | static struct hash *encap_hash = NULL; |
1e20238a | 193 | #ifdef ENABLE_BGP_VNC |
bede7744 LB |
194 | static struct hash *vnc_hash = NULL; |
195 | #endif | |
e496b420 HS |
196 | static struct hash *srv6_l3vpn_hash; |
197 | static struct hash *srv6_vpn_hash; | |
bede7744 | 198 | |
d62a17ae | 199 | struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig) |
f4c89855 | 200 | { |
d62a17ae | 201 | struct bgp_attr_encap_subtlv *new; |
202 | struct bgp_attr_encap_subtlv *tail; | |
203 | struct bgp_attr_encap_subtlv *p; | |
f4c89855 | 204 | |
d62a17ae | 205 | for (p = orig, tail = new = NULL; p; p = p->next) { |
12f70478 | 206 | int size = sizeof(struct bgp_attr_encap_subtlv) + p->length; |
d62a17ae | 207 | if (tail) { |
208 | tail->next = XCALLOC(MTYPE_ENCAP_TLV, size); | |
209 | tail = tail->next; | |
210 | } else { | |
211 | tail = new = XCALLOC(MTYPE_ENCAP_TLV, size); | |
212 | } | |
213 | assert(tail); | |
214 | memcpy(tail, p, size); | |
215 | tail->next = NULL; | |
f4c89855 | 216 | } |
f4c89855 | 217 | |
d62a17ae | 218 | return new; |
f4c89855 LB |
219 | } |
220 | ||
d62a17ae | 221 | static void encap_free(struct bgp_attr_encap_subtlv *p) |
f4c89855 | 222 | { |
d62a17ae | 223 | struct bgp_attr_encap_subtlv *next; |
224 | while (p) { | |
225 | next = p->next; | |
226 | p->next = NULL; | |
227 | XFREE(MTYPE_ENCAP_TLV, p); | |
228 | p = next; | |
229 | } | |
f4c89855 LB |
230 | } |
231 | ||
d62a17ae | 232 | void bgp_attr_flush_encap(struct attr *attr) |
f4c89855 | 233 | { |
d62a17ae | 234 | if (!attr) |
235 | return; | |
f4c89855 | 236 | |
d62a17ae | 237 | if (attr->encap_subtlvs) { |
238 | encap_free(attr->encap_subtlvs); | |
239 | attr->encap_subtlvs = NULL; | |
240 | } | |
1e20238a | 241 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
242 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
243 | bgp_attr_get_vnc_subtlvs(attr); | |
244 | ||
245 | if (vnc_subtlvs) { | |
246 | encap_free(vnc_subtlvs); | |
247 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 248 | } |
65efcfce | 249 | #endif |
f4c89855 LB |
250 | } |
251 | ||
252 | /* | |
253 | * Compare encap sub-tlv chains | |
254 | * | |
255 | * 1 = equivalent | |
256 | * 0 = not equivalent | |
257 | * | |
258 | * This algorithm could be made faster if needed | |
259 | */ | |
3dc339cd DA |
260 | static bool encap_same(const struct bgp_attr_encap_subtlv *h1, |
261 | const struct bgp_attr_encap_subtlv *h2) | |
f4c89855 | 262 | { |
36de6e0e A |
263 | const struct bgp_attr_encap_subtlv *p; |
264 | const struct bgp_attr_encap_subtlv *q; | |
f4c89855 | 265 | |
d62a17ae | 266 | if (h1 == h2) |
3dc339cd | 267 | return true; |
d62a17ae | 268 | if (h1 == NULL || h2 == NULL) |
3dc339cd | 269 | return false; |
f4c89855 | 270 | |
d62a17ae | 271 | for (p = h1; p; p = p->next) { |
272 | for (q = h2; q; q = q->next) { | |
273 | if ((p->type == q->type) && (p->length == q->length) | |
274 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 275 | |
d62a17ae | 276 | break; |
277 | } | |
278 | } | |
279 | if (!q) | |
3dc339cd | 280 | return false; |
f4c89855 | 281 | } |
f4c89855 | 282 | |
d62a17ae | 283 | for (p = h2; p; p = p->next) { |
284 | for (q = h1; q; q = q->next) { | |
285 | if ((p->type == q->type) && (p->length == q->length) | |
286 | && !memcmp(p->value, q->value, p->length)) { | |
f4c89855 | 287 | |
d62a17ae | 288 | break; |
289 | } | |
290 | } | |
291 | if (!q) | |
3dc339cd | 292 | return false; |
f4c89855 | 293 | } |
f4c89855 | 294 | |
3dc339cd | 295 | return true; |
f4c89855 LB |
296 | } |
297 | ||
d62a17ae | 298 | static void *encap_hash_alloc(void *p) |
bede7744 | 299 | { |
d62a17ae | 300 | /* Encap structure is already allocated. */ |
301 | return p; | |
bede7744 LB |
302 | } |
303 | ||
d62a17ae | 304 | typedef enum { |
305 | ENCAP_SUBTLV_TYPE, | |
1e20238a | 306 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 307 | VNC_SUBTLV_TYPE |
bede7744 LB |
308 | #endif |
309 | } encap_subtlv_type; | |
310 | ||
311 | static struct bgp_attr_encap_subtlv * | |
d62a17ae | 312 | encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type) |
bede7744 | 313 | { |
d62a17ae | 314 | struct bgp_attr_encap_subtlv *find; |
315 | struct hash *hash = encap_hash; | |
1e20238a | 316 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 317 | if (type == VNC_SUBTLV_TYPE) |
318 | hash = vnc_hash; | |
bede7744 LB |
319 | #endif |
320 | ||
d62a17ae | 321 | find = hash_get(hash, encap, encap_hash_alloc); |
322 | if (find != encap) | |
323 | encap_free(encap); | |
324 | find->refcnt++; | |
bede7744 | 325 | |
d62a17ae | 326 | return find; |
bede7744 LB |
327 | } |
328 | ||
d62a17ae | 329 | static void encap_unintern(struct bgp_attr_encap_subtlv **encapp, |
330 | encap_subtlv_type type) | |
bede7744 | 331 | { |
d62a17ae | 332 | struct bgp_attr_encap_subtlv *encap = *encapp; |
333 | if (encap->refcnt) | |
334 | encap->refcnt--; | |
bede7744 | 335 | |
d62a17ae | 336 | if (encap->refcnt == 0) { |
337 | struct hash *hash = encap_hash; | |
1e20238a | 338 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 339 | if (type == VNC_SUBTLV_TYPE) |
340 | hash = vnc_hash; | |
bede7744 | 341 | #endif |
d62a17ae | 342 | hash_release(hash, encap); |
343 | encap_free(encap); | |
344 | *encapp = NULL; | |
345 | } | |
bede7744 LB |
346 | } |
347 | ||
d8b87afe | 348 | static unsigned int encap_hash_key_make(const void *p) |
bede7744 | 349 | { |
d62a17ae | 350 | const struct bgp_attr_encap_subtlv *encap = p; |
bede7744 | 351 | |
d62a17ae | 352 | return jhash(encap->value, encap->length, 0); |
bede7744 LB |
353 | } |
354 | ||
74df8d6d | 355 | static bool encap_hash_cmp(const void *p1, const void *p2) |
bede7744 | 356 | { |
36de6e0e A |
357 | return encap_same((const struct bgp_attr_encap_subtlv *)p1, |
358 | (const struct bgp_attr_encap_subtlv *)p2); | |
bede7744 LB |
359 | } |
360 | ||
d62a17ae | 361 | static void encap_init(void) |
bede7744 | 362 | { |
996c9314 | 363 | encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 364 | "BGP Encap Hash"); |
1e20238a | 365 | #ifdef ENABLE_BGP_VNC |
996c9314 | 366 | vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp, |
3f65c5b1 | 367 | "BGP VNC Hash"); |
bede7744 LB |
368 | #endif |
369 | } | |
370 | ||
d62a17ae | 371 | static void encap_finish(void) |
bede7744 | 372 | { |
d8bc11a5 | 373 | hash_clean_and_free(&encap_hash, (void (*)(void *))encap_free); |
1e20238a | 374 | #ifdef ENABLE_BGP_VNC |
d8bc11a5 | 375 | hash_clean_and_free(&vnc_hash, (void (*)(void *))encap_free); |
bede7744 LB |
376 | #endif |
377 | } | |
378 | ||
d62a17ae | 379 | static bool overlay_index_same(const struct attr *a1, const struct attr *a2) |
684a7227 | 380 | { |
d62a17ae | 381 | if (!a1 && a2) |
382 | return false; | |
383 | if (!a2 && a1) | |
384 | return false; | |
385 | if (!a1 && !a2) | |
386 | return true; | |
6c924775 | 387 | |
761cc919 IS |
388 | return bgp_route_evpn_same(bgp_attr_get_evpn_overlay(a1), |
389 | bgp_attr_get_evpn_overlay(a2)); | |
684a7227 PG |
390 | } |
391 | ||
718e3744 | 392 | /* Unknown transit attribute. */ |
9bddac4b | 393 | static struct hash *transit_hash; |
718e3744 | 394 | |
d62a17ae | 395 | static void transit_free(struct transit *transit) |
718e3744 | 396 | { |
0a22ddfb | 397 | XFREE(MTYPE_TRANSIT_VAL, transit->val); |
d62a17ae | 398 | XFREE(MTYPE_TRANSIT, transit); |
718e3744 | 399 | } |
400 | ||
d62a17ae | 401 | static void *transit_hash_alloc(void *p) |
718e3744 | 402 | { |
d62a17ae | 403 | /* Transit structure is already allocated. */ |
404 | return p; | |
718e3744 | 405 | } |
406 | ||
d62a17ae | 407 | static struct transit *transit_intern(struct transit *transit) |
718e3744 | 408 | { |
d62a17ae | 409 | struct transit *find; |
718e3744 | 410 | |
d62a17ae | 411 | find = hash_get(transit_hash, transit, transit_hash_alloc); |
412 | if (find != transit) | |
413 | transit_free(transit); | |
414 | find->refcnt++; | |
718e3744 | 415 | |
d62a17ae | 416 | return find; |
718e3744 | 417 | } |
418 | ||
547357c4 | 419 | static void transit_unintern(struct transit **transit) |
718e3744 | 420 | { |
547357c4 QY |
421 | if ((*transit)->refcnt) |
422 | (*transit)->refcnt--; | |
718e3744 | 423 | |
547357c4 QY |
424 | if ((*transit)->refcnt == 0) { |
425 | hash_release(transit_hash, *transit); | |
426 | transit_free(*transit); | |
427 | *transit = NULL; | |
d62a17ae | 428 | } |
718e3744 | 429 | } |
430 | ||
97a52c82 DA |
431 | static bool bgp_attr_aigp_get_tlv_metric(uint8_t *pnt, int length, |
432 | uint64_t *aigp) | |
433 | { | |
434 | uint8_t *data = pnt; | |
435 | uint8_t tlv_type; | |
436 | uint16_t tlv_length; | |
437 | ||
438 | while (length) { | |
439 | tlv_type = *data; | |
440 | ptr_get_be16(data + 1, &tlv_length); | |
441 | (void)data; | |
442 | ||
443 | /* The value field of the AIGP TLV is always 8 octets | |
444 | * long and its value is interpreted as an unsigned 64-bit | |
445 | * integer. | |
446 | */ | |
447 | if (tlv_type == BGP_AIGP_TLV_METRIC) { | |
448 | (void)ptr_get_be64(data + 3, aigp); | |
449 | ||
450 | /* If an AIGP attribute is received and its first AIGP | |
451 | * TLV contains the maximum value 0xffffffffffffffff, | |
452 | * the attribute SHOULD be considered to be malformed | |
453 | * and SHOULD be discarded as specified in this section. | |
454 | */ | |
455 | if (*aigp == BGP_AIGP_TLV_METRIC_MAX) { | |
456 | zlog_err("Bad AIGP TLV (%s) length: %llu", | |
457 | BGP_AIGP_TLV_METRIC_DESC, | |
458 | BGP_AIGP_TLV_METRIC_MAX); | |
459 | return false; | |
460 | } | |
461 | ||
462 | return true; | |
463 | } | |
464 | ||
465 | data += tlv_length; | |
466 | length -= tlv_length; | |
467 | } | |
468 | ||
469 | return false; | |
470 | } | |
471 | ||
472 | static uint64_t bgp_aigp_metric_total(struct bgp_path_info *bpi) | |
473 | { | |
474 | uint64_t aigp = bgp_attr_get_aigp_metric(bpi->attr); | |
475 | ||
476 | if (bpi->nexthop) | |
477 | return aigp + bpi->nexthop->metric; | |
478 | else | |
479 | return aigp; | |
480 | } | |
481 | ||
482 | static void stream_put_bgp_aigp_tlv_metric(struct stream *s, | |
483 | struct bgp_path_info *bpi) | |
484 | { | |
485 | stream_putc(s, BGP_AIGP_TLV_METRIC); | |
486 | stream_putw(s, BGP_AIGP_TLV_METRIC_LEN); | |
487 | stream_putq(s, bgp_aigp_metric_total(bpi)); | |
488 | } | |
489 | ||
490 | static bool bgp_attr_aigp_valid(uint8_t *pnt, int length) | |
491 | { | |
492 | uint8_t *data = pnt; | |
493 | uint8_t tlv_type; | |
494 | uint16_t tlv_length; | |
495 | ||
496 | if (length < 3) { | |
497 | zlog_err("Bad AIGP attribute length (MUST be minimum 3): %u", | |
498 | length); | |
499 | return false; | |
500 | } | |
501 | ||
502 | while (length) { | |
503 | tlv_type = *data; | |
504 | ptr_get_be16(data + 1, &tlv_length); | |
505 | (void)data; | |
506 | ||
507 | if (length < tlv_length) { | |
508 | zlog_err( | |
509 | "Bad AIGP attribute length: %u, but TLV length: %u", | |
510 | length, tlv_length); | |
511 | return false; | |
512 | } | |
513 | ||
514 | if (tlv_length < 3) { | |
515 | zlog_err("Bad AIGP TLV length (MUST be minimum 3): %u", | |
516 | tlv_length); | |
517 | return false; | |
518 | } | |
519 | ||
520 | /* AIGP TLV, Length: 11 */ | |
521 | if (tlv_type == BGP_AIGP_TLV_METRIC && | |
522 | tlv_length != BGP_AIGP_TLV_METRIC_LEN) { | |
523 | zlog_err("Bad AIGP TLV (%s) length: %u", | |
524 | BGP_AIGP_TLV_METRIC_DESC, tlv_length); | |
525 | return false; | |
526 | } | |
527 | ||
528 | data += tlv_length; | |
529 | length -= tlv_length; | |
530 | } | |
531 | ||
532 | return true; | |
533 | } | |
534 | ||
e496b420 HS |
535 | static void *srv6_l3vpn_hash_alloc(void *p) |
536 | { | |
537 | return p; | |
538 | } | |
539 | ||
540 | static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn) | |
541 | { | |
542 | XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn); | |
543 | } | |
544 | ||
545 | static struct bgp_attr_srv6_l3vpn * | |
546 | srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn) | |
547 | { | |
548 | struct bgp_attr_srv6_l3vpn *find; | |
549 | ||
550 | find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc); | |
551 | if (find != l3vpn) | |
552 | srv6_l3vpn_free(l3vpn); | |
553 | find->refcnt++; | |
554 | return find; | |
555 | } | |
556 | ||
557 | static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp) | |
558 | { | |
559 | struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp; | |
560 | ||
561 | if (l3vpn->refcnt) | |
562 | l3vpn->refcnt--; | |
563 | ||
564 | if (l3vpn->refcnt == 0) { | |
565 | hash_release(srv6_l3vpn_hash, l3vpn); | |
566 | srv6_l3vpn_free(l3vpn); | |
567 | *l3vpnp = NULL; | |
568 | } | |
569 | } | |
570 | ||
571 | static void *srv6_vpn_hash_alloc(void *p) | |
572 | { | |
573 | return p; | |
574 | } | |
575 | ||
576 | static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn) | |
577 | { | |
578 | XFREE(MTYPE_BGP_SRV6_VPN, vpn); | |
579 | } | |
580 | ||
581 | static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn) | |
582 | { | |
583 | struct bgp_attr_srv6_vpn *find; | |
584 | ||
585 | find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc); | |
586 | if (find != vpn) | |
587 | srv6_vpn_free(vpn); | |
588 | find->refcnt++; | |
589 | return find; | |
590 | } | |
591 | ||
592 | static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp) | |
593 | { | |
594 | struct bgp_attr_srv6_vpn *vpn = *vpnp; | |
595 | ||
596 | if (vpn->refcnt) | |
597 | vpn->refcnt--; | |
598 | ||
599 | if (vpn->refcnt == 0) { | |
600 | hash_release(srv6_vpn_hash, vpn); | |
601 | srv6_vpn_free(vpn); | |
602 | *vpnp = NULL; | |
603 | } | |
604 | } | |
605 | ||
606 | static uint32_t srv6_l3vpn_hash_key_make(const void *p) | |
607 | { | |
608 | const struct bgp_attr_srv6_l3vpn *l3vpn = p; | |
609 | uint32_t key = 0; | |
610 | ||
611 | key = jhash(&l3vpn->sid, 16, key); | |
612 | key = jhash_1word(l3vpn->sid_flags, key); | |
613 | key = jhash_1word(l3vpn->endpoint_behavior, key); | |
9299fd00 RS |
614 | key = jhash_1word(l3vpn->loc_block_len, key); |
615 | key = jhash_1word(l3vpn->loc_node_len, key); | |
616 | key = jhash_1word(l3vpn->func_len, key); | |
617 | key = jhash_1word(l3vpn->arg_len, key); | |
618 | key = jhash_1word(l3vpn->transposition_len, key); | |
619 | key = jhash_1word(l3vpn->transposition_offset, key); | |
e496b420 HS |
620 | return key; |
621 | } | |
622 | ||
623 | static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2) | |
624 | { | |
625 | const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1; | |
626 | const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2; | |
627 | ||
628 | return sid_same(&l3vpn1->sid, &l3vpn2->sid) | |
629 | && l3vpn1->sid_flags == l3vpn2->sid_flags | |
9299fd00 RS |
630 | && l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior |
631 | && l3vpn1->loc_block_len == l3vpn2->loc_block_len | |
632 | && l3vpn1->loc_node_len == l3vpn2->loc_node_len | |
633 | && l3vpn1->func_len == l3vpn2->func_len | |
634 | && l3vpn1->arg_len == l3vpn2->arg_len | |
635 | && l3vpn1->transposition_len == l3vpn2->transposition_len | |
636 | && l3vpn1->transposition_offset == l3vpn2->transposition_offset; | |
e496b420 HS |
637 | } |
638 | ||
639 | static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1, | |
640 | const struct bgp_attr_srv6_l3vpn *h2) | |
641 | { | |
642 | if (h1 == h2) | |
643 | return true; | |
644 | else if (h1 == NULL || h2 == NULL) | |
645 | return false; | |
646 | else | |
647 | return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2); | |
648 | } | |
649 | ||
650 | static unsigned int srv6_vpn_hash_key_make(const void *p) | |
651 | { | |
652 | const struct bgp_attr_srv6_vpn *vpn = p; | |
653 | uint32_t key = 0; | |
654 | ||
655 | key = jhash(&vpn->sid, 16, key); | |
656 | key = jhash_1word(vpn->sid_flags, key); | |
657 | return key; | |
658 | } | |
659 | ||
660 | static bool srv6_vpn_hash_cmp(const void *p1, const void *p2) | |
661 | { | |
662 | const struct bgp_attr_srv6_vpn *vpn1 = p1; | |
663 | const struct bgp_attr_srv6_vpn *vpn2 = p2; | |
664 | ||
665 | return sid_same(&vpn1->sid, &vpn2->sid) | |
666 | && vpn1->sid_flags == vpn2->sid_flags; | |
667 | } | |
668 | ||
669 | static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1, | |
670 | const struct bgp_attr_srv6_vpn *h2) | |
671 | { | |
672 | if (h1 == h2) | |
673 | return true; | |
674 | else if (h1 == NULL || h2 == NULL) | |
675 | return false; | |
676 | else | |
677 | return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2); | |
678 | } | |
679 | ||
680 | static void srv6_init(void) | |
681 | { | |
682 | srv6_l3vpn_hash = | |
683 | hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp, | |
684 | "BGP Prefix-SID SRv6-L3VPN-Service-TLV"); | |
685 | srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp, | |
686 | "BGP Prefix-SID SRv6-VPN-Service-TLV"); | |
687 | } | |
688 | ||
689 | static void srv6_finish(void) | |
690 | { | |
d8bc11a5 DS |
691 | hash_clean_and_free(&srv6_l3vpn_hash, |
692 | (void (*)(void *))srv6_l3vpn_free); | |
693 | hash_clean_and_free(&srv6_vpn_hash, (void (*)(void *))srv6_vpn_free); | |
e496b420 HS |
694 | } |
695 | ||
d8b87afe | 696 | static unsigned int transit_hash_key_make(const void *p) |
718e3744 | 697 | { |
d62a17ae | 698 | const struct transit *transit = p; |
718e3744 | 699 | |
d62a17ae | 700 | return jhash(transit->val, transit->length, 0); |
718e3744 | 701 | } |
702 | ||
74df8d6d | 703 | static bool transit_hash_cmp(const void *p1, const void *p2) |
718e3744 | 704 | { |
d62a17ae | 705 | const struct transit *transit1 = p1; |
706 | const struct transit *transit2 = p2; | |
923de654 | 707 | |
d62a17ae | 708 | return (transit1->length == transit2->length |
709 | && memcmp(transit1->val, transit2->val, transit1->length) == 0); | |
718e3744 | 710 | } |
711 | ||
d62a17ae | 712 | static void transit_init(void) |
718e3744 | 713 | { |
996c9314 | 714 | transit_hash = hash_create(transit_hash_key_make, transit_hash_cmp, |
3f65c5b1 | 715 | "BGP Transit Hash"); |
718e3744 | 716 | } |
228da428 | 717 | |
d62a17ae | 718 | static void transit_finish(void) |
228da428 | 719 | { |
d8bc11a5 | 720 | hash_clean_and_free(&transit_hash, (void (*)(void *))transit_free); |
228da428 | 721 | } |
6b0655a2 | 722 | |
718e3744 | 723 | /* Attribute hash routines. */ |
9bddac4b | 724 | static struct hash *attrhash; |
718e3744 | 725 | |
d62a17ae | 726 | unsigned long int attr_count(void) |
cbdfbaa5 | 727 | { |
d62a17ae | 728 | return attrhash->count; |
cbdfbaa5 PJ |
729 | } |
730 | ||
d62a17ae | 731 | unsigned long int attr_unknown_count(void) |
cbdfbaa5 | 732 | { |
d62a17ae | 733 | return transit_hash->count; |
cbdfbaa5 PJ |
734 | } |
735 | ||
d8b87afe | 736 | unsigned int attrhash_key_make(const void *p) |
718e3744 | 737 | { |
d62a17ae | 738 | const struct attr *attr = (struct attr *)p; |
739 | uint32_t key = 0; | |
c8e7b895 | 740 | #define MIX(val) key = jhash_1word(val, key) |
0d0268a6 | 741 | #define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key) |
c8e7b895 | 742 | |
0d0268a6 | 743 | MIX3(attr->origin, attr->nexthop.s_addr, attr->med); |
996c9314 LB |
744 | MIX3(attr->local_pref, attr->aggregator_as, |
745 | attr->aggregator_addr.s_addr); | |
0d0268a6 LB |
746 | MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr, |
747 | attr->originator_id.s_addr); | |
748 | MIX3(attr->tag, attr->label, attr->label_index); | |
d62a17ae | 749 | |
750 | if (attr->aspath) | |
751 | MIX(aspath_key_make(attr->aspath)); | |
9a706b42 DA |
752 | if (bgp_attr_get_community(attr)) |
753 | MIX(community_hash_make(bgp_attr_get_community(attr))); | |
1bcf3a96 DA |
754 | if (bgp_attr_get_lcommunity(attr)) |
755 | MIX(lcommunity_hash_make(bgp_attr_get_lcommunity(attr))); | |
b53e67a3 DA |
756 | if (bgp_attr_get_ecommunity(attr)) |
757 | MIX(ecommunity_hash_make(bgp_attr_get_ecommunity(attr))); | |
d04ac434 DS |
758 | if (bgp_attr_get_ipv6_ecommunity(attr)) |
759 | MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr))); | |
779fee93 DS |
760 | if (bgp_attr_get_cluster(attr)) |
761 | MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr))); | |
04fb21e2 DS |
762 | if (bgp_attr_get_transit(attr)) |
763 | MIX(transit_hash_key_make(bgp_attr_get_transit(attr))); | |
d62a17ae | 764 | if (attr->encap_subtlvs) |
765 | MIX(encap_hash_key_make(attr->encap_subtlvs)); | |
b83127e1 HS |
766 | if (attr->srv6_l3vpn) |
767 | MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn)); | |
768 | if (attr->srv6_vpn) | |
769 | MIX(srv6_vpn_hash_key_make(attr->srv6_vpn)); | |
1e20238a | 770 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
771 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
772 | bgp_attr_get_vnc_subtlvs(attr); | |
773 | if (vnc_subtlvs) | |
774 | MIX(encap_hash_key_make(vnc_subtlvs)); | |
bede7744 | 775 | #endif |
d62a17ae | 776 | MIX(attr->mp_nexthop_len); |
777 | key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key); | |
778 | key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key); | |
7b7d48e5 | 779 | MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance); |
951745bd | 780 | MIX(attr->rmap_table_id); |
0789eb69 KM |
781 | MIX(attr->nh_type); |
782 | MIX(attr->bh_type); | |
d864dd9e | 783 | MIX(attr->otc); |
97a52c82 | 784 | MIX(bgp_attr_get_aigp_metric(attr)); |
d62a17ae | 785 | |
786 | return key; | |
787 | } | |
788 | ||
74df8d6d | 789 | bool attrhash_cmp(const void *p1, const void *p2) |
d62a17ae | 790 | { |
791 | const struct attr *attr1 = p1; | |
792 | const struct attr *attr2 = p2; | |
793 | ||
794 | if (attr1->flag == attr2->flag && attr1->origin == attr2->origin | |
795 | && attr1->nexthop.s_addr == attr2->nexthop.s_addr | |
796 | && attr1->aspath == attr2->aspath | |
9a706b42 DA |
797 | && bgp_attr_get_community(attr1) |
798 | == bgp_attr_get_community(attr2) | |
799 | && attr1->med == attr2->med | |
d62a17ae | 800 | && attr1->local_pref == attr2->local_pref |
801 | && attr1->rmap_change_flags == attr2->rmap_change_flags) { | |
6a381277 PG |
802 | if (attr1->aggregator_as == attr2->aggregator_as && |
803 | attr1->aggregator_addr.s_addr == | |
804 | attr2->aggregator_addr.s_addr && | |
805 | attr1->weight == attr2->weight && | |
806 | attr1->tag == attr2->tag && | |
807 | attr1->label_index == attr2->label_index && | |
808 | attr1->mp_nexthop_len == attr2->mp_nexthop_len && | |
809 | bgp_attr_get_ecommunity(attr1) == | |
810 | bgp_attr_get_ecommunity(attr2) && | |
811 | bgp_attr_get_ipv6_ecommunity(attr1) == | |
812 | bgp_attr_get_ipv6_ecommunity(attr2) && | |
813 | bgp_attr_get_lcommunity(attr1) == | |
814 | bgp_attr_get_lcommunity(attr2) && | |
815 | bgp_attr_get_cluster(attr1) == | |
816 | bgp_attr_get_cluster(attr2) && | |
817 | bgp_attr_get_transit(attr1) == | |
818 | bgp_attr_get_transit(attr2) && | |
819 | bgp_attr_get_aigp_metric(attr1) == | |
820 | bgp_attr_get_aigp_metric(attr2) && | |
821 | attr1->rmap_table_id == attr2->rmap_table_id && | |
822 | (attr1->encap_tunneltype == attr2->encap_tunneltype) && | |
823 | encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs) | |
1e20238a | 824 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
825 | && encap_same(bgp_attr_get_vnc_subtlvs(attr1), |
826 | bgp_attr_get_vnc_subtlvs(attr2)) | |
65efcfce | 827 | #endif |
0d0268a6 | 828 | && IPV6_ADDR_SAME(&attr1->mp_nexthop_global, |
6a381277 PG |
829 | &attr2->mp_nexthop_global) && |
830 | IPV6_ADDR_SAME(&attr1->mp_nexthop_local, | |
831 | &attr2->mp_nexthop_local) && | |
832 | IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in, | |
833 | &attr2->mp_nexthop_global_in) && | |
834 | IPV4_ADDR_SAME(&attr1->originator_id, | |
835 | &attr2->originator_id) && | |
836 | overlay_index_same(attr1, attr2) && | |
837 | !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t)) && | |
838 | attr1->es_flags == attr2->es_flags && | |
839 | attr1->mm_sync_seqnum == attr2->mm_sync_seqnum && | |
840 | attr1->df_pref == attr2->df_pref && | |
841 | attr1->df_alg == attr2->df_alg && | |
842 | attr1->nh_ifindex == attr2->nh_ifindex && | |
843 | attr1->nh_lla_ifindex == attr2->nh_lla_ifindex && | |
844 | attr1->distance == attr2->distance && | |
845 | srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn) && | |
846 | srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn) && | |
847 | attr1->srte_color == attr2->srte_color && | |
848 | attr1->nh_type == attr2->nh_type && | |
849 | attr1->bh_type == attr2->bh_type && | |
850 | attr1->otc == attr2->otc) | |
74df8d6d | 851 | return true; |
d62a17ae | 852 | } |
aadc0905 | 853 | |
74df8d6d | 854 | return false; |
718e3744 | 855 | } |
856 | ||
d62a17ae | 857 | static void attrhash_init(void) |
718e3744 | 858 | { |
996c9314 LB |
859 | attrhash = |
860 | hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes"); | |
718e3744 | 861 | } |
862 | ||
289d2501 LB |
863 | /* |
864 | * special for hash_clean below | |
865 | */ | |
d62a17ae | 866 | static void attr_vfree(void *attr) |
289d2501 | 867 | { |
d62a17ae | 868 | XFREE(MTYPE_ATTR, attr); |
289d2501 LB |
869 | } |
870 | ||
d62a17ae | 871 | static void attrhash_finish(void) |
228da428 | 872 | { |
d8bc11a5 | 873 | hash_clean_and_free(&attrhash, attr_vfree); |
228da428 CC |
874 | } |
875 | ||
e3b78da8 | 876 | static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty) |
718e3744 | 877 | { |
e3b78da8 | 878 | struct attr *attr = bucket->data; |
42d1ca39 DA |
879 | struct in6_addr *sid = NULL; |
880 | ||
881 | if (attr->srv6_l3vpn) | |
882 | sid = &attr->srv6_l3vpn->sid; | |
883 | else if (attr->srv6_vpn) | |
884 | sid = &attr->srv6_vpn->sid; | |
718e3744 | 885 | |
23d0a753 | 886 | vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop); |
e496b420 | 887 | |
e496b420 | 888 | vty_out(vty, |
07380148 DA |
889 | "\tflags: %" PRIu64 |
890 | " distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %pI6\n", | |
957f74c3 | 891 | attr->flag, attr->distance, attr->med, attr->local_pref, |
42d1ca39 | 892 | attr->origin, attr->weight, attr->label, sid); |
718e3744 | 893 | } |
894 | ||
d62a17ae | 895 | void attr_show_all(struct vty *vty) |
718e3744 | 896 | { |
e3b78da8 | 897 | hash_iterate(attrhash, (void (*)(struct hash_bucket *, |
9d303b37 DL |
898 | void *))attr_show_all_iterator, |
899 | vty); | |
718e3744 | 900 | } |
901 | ||
d62a17ae | 902 | static void *bgp_attr_hash_alloc(void *p) |
718e3744 | 903 | { |
d62a17ae | 904 | struct attr *val = (struct attr *)p; |
905 | struct attr *attr; | |
718e3744 | 906 | |
d62a17ae | 907 | attr = XMALLOC(MTYPE_ATTR, sizeof(struct attr)); |
908 | *attr = *val; | |
909 | if (val->encap_subtlvs) { | |
910 | val->encap_subtlvs = NULL; | |
911 | } | |
1e20238a | 912 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
913 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
914 | bgp_attr_get_vnc_subtlvs(val); | |
915 | ||
916 | if (vnc_subtlvs) | |
917 | bgp_attr_set_vnc_subtlvs(val, NULL); | |
65efcfce | 918 | #endif |
e496b420 | 919 | |
d62a17ae | 920 | attr->refcnt = 0; |
921 | return attr; | |
718e3744 | 922 | } |
923 | ||
924 | /* Internet argument attribute. */ | |
d62a17ae | 925 | struct attr *bgp_attr_intern(struct attr *attr) |
926 | { | |
927 | struct attr *find; | |
b53e67a3 DA |
928 | struct ecommunity *ecomm = NULL; |
929 | struct ecommunity *ipv6_ecomm = NULL; | |
1bcf3a96 | 930 | struct lcommunity *lcomm = NULL; |
9a706b42 | 931 | struct community *comm = NULL; |
d62a17ae | 932 | |
544be979 | 933 | /* Intern referenced structure. */ |
d62a17ae | 934 | if (attr->aspath) { |
935 | if (!attr->aspath->refcnt) | |
936 | attr->aspath = aspath_intern(attr->aspath); | |
937 | else | |
938 | attr->aspath->refcnt++; | |
939 | } | |
9a706b42 DA |
940 | |
941 | comm = bgp_attr_get_community(attr); | |
942 | if (comm) { | |
943 | if (!comm->refcnt) | |
944 | bgp_attr_set_community(attr, community_intern(comm)); | |
d62a17ae | 945 | else |
9a706b42 | 946 | comm->refcnt++; |
d62a17ae | 947 | } |
948 | ||
b53e67a3 | 949 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
950 | if (ecomm) { |
951 | if (!ecomm->refcnt) | |
b53e67a3 | 952 | bgp_attr_set_ecommunity(attr, ecommunity_intern(ecomm)); |
9a659715 | 953 | else |
d04ac434 | 954 | ecomm->refcnt++; |
9a659715 PG |
955 | } |
956 | ||
b53e67a3 DA |
957 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
958 | if (ipv6_ecomm) { | |
959 | if (!ipv6_ecomm->refcnt) | |
960 | bgp_attr_set_ipv6_ecommunity( | |
961 | attr, ecommunity_intern(ipv6_ecomm)); | |
962 | else | |
963 | ipv6_ecomm->refcnt++; | |
964 | } | |
965 | ||
1bcf3a96 DA |
966 | lcomm = bgp_attr_get_lcommunity(attr); |
967 | if (lcomm) { | |
968 | if (!lcomm->refcnt) | |
969 | bgp_attr_set_lcommunity(attr, lcommunity_intern(lcomm)); | |
d62a17ae | 970 | else |
1bcf3a96 | 971 | lcomm->refcnt++; |
d62a17ae | 972 | } |
779fee93 DS |
973 | |
974 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); | |
975 | ||
976 | if (cluster) { | |
977 | if (!cluster->refcnt) | |
978 | bgp_attr_set_cluster(attr, cluster_intern(cluster)); | |
d62a17ae | 979 | else |
779fee93 | 980 | cluster->refcnt++; |
d62a17ae | 981 | } |
04fb21e2 DS |
982 | |
983 | struct transit *transit = bgp_attr_get_transit(attr); | |
984 | ||
985 | if (transit) { | |
986 | if (!transit->refcnt) | |
987 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
d62a17ae | 988 | else |
04fb21e2 | 989 | transit->refcnt++; |
d62a17ae | 990 | } |
991 | if (attr->encap_subtlvs) { | |
992 | if (!attr->encap_subtlvs->refcnt) | |
993 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
994 | ENCAP_SUBTLV_TYPE); | |
995 | else | |
996 | attr->encap_subtlvs->refcnt++; | |
997 | } | |
e496b420 HS |
998 | if (attr->srv6_l3vpn) { |
999 | if (!attr->srv6_l3vpn->refcnt) | |
1000 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
1001 | else | |
1002 | attr->srv6_l3vpn->refcnt++; | |
1003 | } | |
1004 | if (attr->srv6_vpn) { | |
1005 | if (!attr->srv6_vpn->refcnt) | |
1006 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); | |
1007 | else | |
1008 | attr->srv6_vpn->refcnt++; | |
1009 | } | |
1e20238a | 1010 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1011 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1012 | bgp_attr_get_vnc_subtlvs(attr); | |
1013 | ||
1014 | if (vnc_subtlvs) { | |
1015 | if (!vnc_subtlvs->refcnt) | |
1016 | bgp_attr_set_vnc_subtlvs( | |
1017 | attr, | |
1018 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
d62a17ae | 1019 | else |
91ebf12c | 1020 | vnc_subtlvs->refcnt++; |
d62a17ae | 1021 | } |
aadc0905 | 1022 | #endif |
bede7744 | 1023 | |
dbbac180 DL |
1024 | /* At this point, attr only contains intern'd pointers. that means |
1025 | * if we find it in attrhash, it has all the same pointers and we | |
1026 | * correctly updated the refcounts on these. | |
1027 | * If we don't find it, we need to allocate a one because in all | |
1028 | * cases this returns a new reference to a hashed attr, but the input | |
1029 | * wasn't on hash. */ | |
d62a17ae | 1030 | find = (struct attr *)hash_get(attrhash, attr, bgp_attr_hash_alloc); |
1031 | find->refcnt++; | |
1032 | ||
1033 | return find; | |
718e3744 | 1034 | } |
1035 | ||
1036 | /* Make network statement's attribute. */ | |
0f05ea43 DA |
1037 | struct attr *bgp_attr_default_set(struct attr *attr, struct bgp *bgp, |
1038 | uint8_t origin) | |
718e3744 | 1039 | { |
d62a17ae | 1040 | memset(attr, 0, sizeof(struct attr)); |
03e214c8 | 1041 | |
d62a17ae | 1042 | attr->origin = origin; |
1043 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
17571c4a | 1044 | attr->aspath = aspath_empty(bgp->asnotation); |
d62a17ae | 1045 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); |
1046 | attr->weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1047 | attr->tag = 0; | |
1048 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
1049 | attr->label = MPLS_INVALID_LABEL; | |
1050 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1051 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
0f05ea43 | 1052 | attr->local_pref = bgp->default_local_pref; |
d62a17ae | 1053 | |
1054 | return attr; | |
718e3744 | 1055 | } |
1056 | ||
b5d58c32 | 1057 | /* Create the attributes for an aggregate */ |
5f040085 DS |
1058 | struct attr *bgp_attr_aggregate_intern( |
1059 | struct bgp *bgp, uint8_t origin, struct aspath *aspath, | |
1060 | struct community *community, struct ecommunity *ecommunity, | |
1061 | struct lcommunity *lcommunity, struct bgp_aggregate *aggregate, | |
1062 | uint8_t atomic_aggregate, const struct prefix *p) | |
d62a17ae | 1063 | { |
1064 | struct attr attr; | |
1065 | struct attr *new; | |
fd283bd2 | 1066 | route_map_result_t ret; |
d62a17ae | 1067 | |
6006b807 | 1068 | memset(&attr, 0, sizeof(attr)); |
d62a17ae | 1069 | |
1070 | /* Origin attribute. */ | |
1071 | attr.origin = origin; | |
1072 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1073 | ||
59136db5 DA |
1074 | /* MED */ |
1075 | attr.med = 0; | |
1076 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); | |
1077 | ||
d62a17ae | 1078 | /* AS path attribute. */ |
1079 | if (aspath) | |
1080 | attr.aspath = aspath_intern(aspath); | |
1081 | else | |
17571c4a | 1082 | attr.aspath = aspath_empty(bgp->asnotation); |
d62a17ae | 1083 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); |
1084 | ||
1085 | /* Next hop attribute. */ | |
1086 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); | |
1087 | ||
1088 | if (community) { | |
d7c0a89a | 1089 | uint32_t gshut = COMMUNITY_GSHUT; |
7f323236 DW |
1090 | |
1091 | /* If we are not shutting down ourselves and we are | |
1092 | * aggregating a route that contains the GSHUT community we | |
1093 | * need to remove that community when creating the aggregate */ | |
637e5ba4 | 1094 | if (!bgp_in_graceful_shutdown(bgp) |
996c9314 | 1095 | && community_include(community, gshut)) { |
7f323236 DW |
1096 | community_del_val(community, &gshut); |
1097 | } | |
1098 | ||
9a706b42 | 1099 | bgp_attr_set_community(&attr, community); |
d62a17ae | 1100 | } |
1101 | ||
58cf5c08 | 1102 | if (ecommunity) |
b53e67a3 | 1103 | bgp_attr_set_ecommunity(&attr, ecommunity); |
3da2cc32 | 1104 | |
9d34440b | 1105 | if (lcommunity) |
1bcf3a96 | 1106 | bgp_attr_set_lcommunity(&attr, lcommunity); |
dd18c5a9 | 1107 | |
637e5ba4 | 1108 | if (bgp_in_graceful_shutdown(bgp)) |
7f323236 | 1109 | bgp_attr_add_gshut_community(&attr); |
7f323236 | 1110 | |
d62a17ae | 1111 | attr.label_index = BGP_INVALID_LABEL_INDEX; |
1112 | attr.label = MPLS_INVALID_LABEL; | |
1113 | attr.weight = BGP_ATTR_DEFAULT_WEIGHT; | |
1114 | attr.mp_nexthop_len = IPV6_MAX_BYTELEN; | |
20894f50 | 1115 | if (!aggregate->as_set || atomic_aggregate) |
d62a17ae | 1116 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); |
1117 | attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); | |
1118 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) | |
1119 | attr.aggregator_as = bgp->confed_id; | |
1120 | else | |
1121 | attr.aggregator_as = bgp->as; | |
1122 | attr.aggregator_addr = bgp->router_id; | |
d62a17ae | 1123 | |
20894f50 DA |
1124 | /* Apply route-map */ |
1125 | if (aggregate->rmap.name) { | |
1126 | struct attr attr_tmp = attr; | |
1127 | struct bgp_path_info rmap_path; | |
1128 | ||
6006b807 | 1129 | memset(&rmap_path, 0, sizeof(rmap_path)); |
20894f50 DA |
1130 | rmap_path.peer = bgp->peer_self; |
1131 | rmap_path.attr = &attr_tmp; | |
1132 | ||
1133 | SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE); | |
1134 | ||
1782514f | 1135 | ret = route_map_apply(aggregate->rmap.map, p, &rmap_path); |
20894f50 DA |
1136 | |
1137 | bgp->peer_self->rmap_type = 0; | |
1138 | ||
1139 | if (ret == RMAP_DENYMATCH) { | |
1140 | /* Free uninterned attribute. */ | |
1141 | bgp_attr_flush(&attr_tmp); | |
1142 | ||
1143 | /* Unintern original. */ | |
1144 | aspath_unintern(&attr.aspath); | |
1145 | return NULL; | |
1146 | } | |
1147 | ||
637e5ba4 | 1148 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1149 | bgp_attr_add_gshut_community(&attr_tmp); |
1150 | ||
1151 | new = bgp_attr_intern(&attr_tmp); | |
1152 | } else { | |
1153 | ||
637e5ba4 | 1154 | if (bgp_in_graceful_shutdown(bgp)) |
20894f50 DA |
1155 | bgp_attr_add_gshut_community(&attr); |
1156 | ||
1157 | new = bgp_attr_intern(&attr); | |
1158 | } | |
d62a17ae | 1159 | |
8bd0d3b1 RZ |
1160 | /* Always release the 'intern()'ed AS Path. */ |
1161 | aspath_unintern(&attr.aspath); | |
1162 | ||
d62a17ae | 1163 | return new; |
718e3744 | 1164 | } |
1165 | ||
b881c707 | 1166 | /* Unintern just the sub-components of the attr, but not the attr */ |
d62a17ae | 1167 | void bgp_attr_unintern_sub(struct attr *attr) |
1168 | { | |
b53e67a3 DA |
1169 | struct ecommunity *ecomm = NULL; |
1170 | struct ecommunity *ipv6_ecomm = NULL; | |
779fee93 | 1171 | struct cluster_list *cluster; |
1bcf3a96 | 1172 | struct lcommunity *lcomm = NULL; |
9a706b42 | 1173 | struct community *comm = NULL; |
d04ac434 | 1174 | |
d62a17ae | 1175 | /* aspath refcount shoud be decrement. */ |
b7b3e63c | 1176 | aspath_unintern(&attr->aspath); |
d62a17ae | 1177 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)); |
1178 | ||
9a706b42 DA |
1179 | comm = bgp_attr_get_community(attr); |
1180 | community_unintern(&comm); | |
9a706b42 | 1181 | bgp_attr_set_community(attr, NULL); |
d62a17ae | 1182 | |
b53e67a3 DA |
1183 | ecomm = bgp_attr_get_ecommunity(attr); |
1184 | ecommunity_unintern(&ecomm); | |
b53e67a3 | 1185 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 1186 | |
b53e67a3 DA |
1187 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1188 | ecommunity_unintern(&ipv6_ecomm); | |
d04ac434 | 1189 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a659715 | 1190 | |
1bcf3a96 DA |
1191 | lcomm = bgp_attr_get_lcommunity(attr); |
1192 | lcommunity_unintern(&lcomm); | |
1bcf3a96 | 1193 | bgp_attr_set_lcommunity(attr, NULL); |
d62a17ae | 1194 | |
779fee93 DS |
1195 | cluster = bgp_attr_get_cluster(attr); |
1196 | if (cluster) { | |
1197 | cluster_unintern(&cluster); | |
1198 | bgp_attr_set_cluster(attr, cluster); | |
1199 | } | |
d62a17ae | 1200 | UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)); |
1201 | ||
04fb21e2 DS |
1202 | struct transit *transit = bgp_attr_get_transit(attr); |
1203 | ||
1204 | if (transit) { | |
1205 | transit_unintern(&transit); | |
1206 | bgp_attr_set_transit(attr, transit); | |
1207 | } | |
d62a17ae | 1208 | |
1209 | if (attr->encap_subtlvs) | |
1210 | encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE); | |
bede7744 | 1211 | |
1e20238a | 1212 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1213 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1214 | bgp_attr_get_vnc_subtlvs(attr); | |
1215 | ||
1216 | if (vnc_subtlvs) { | |
1217 | encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE); | |
1218 | bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs); | |
1219 | } | |
bede7744 | 1220 | #endif |
e496b420 HS |
1221 | |
1222 | if (attr->srv6_l3vpn) | |
1223 | srv6_l3vpn_unintern(&attr->srv6_l3vpn); | |
1224 | ||
1225 | if (attr->srv6_vpn) | |
1226 | srv6_vpn_unintern(&attr->srv6_vpn); | |
b881c707 PJ |
1227 | } |
1228 | ||
718e3744 | 1229 | /* Free bgp attribute and aspath. */ |
d62a17ae | 1230 | void bgp_attr_unintern(struct attr **pattr) |
1231 | { | |
1232 | struct attr *attr = *pattr; | |
1233 | struct attr *ret; | |
1234 | struct attr tmp; | |
1235 | ||
1236 | /* Decrement attribute reference. */ | |
1237 | attr->refcnt--; | |
1238 | ||
1239 | tmp = *attr; | |
1240 | ||
1241 | /* If reference becomes zero then free attribute object. */ | |
1242 | if (attr->refcnt == 0) { | |
1243 | ret = hash_release(attrhash, attr); | |
1244 | assert(ret != NULL); | |
1245 | XFREE(MTYPE_ATTR, attr); | |
1246 | *pattr = NULL; | |
1247 | } | |
1248 | ||
1249 | bgp_attr_unintern_sub(&tmp); | |
1250 | } | |
1251 | ||
1252 | void bgp_attr_flush(struct attr *attr) | |
1253 | { | |
d04ac434 | 1254 | struct ecommunity *ecomm; |
b53e67a3 | 1255 | struct ecommunity *ipv6_ecomm; |
779fee93 | 1256 | struct cluster_list *cluster; |
1bcf3a96 | 1257 | struct lcommunity *lcomm; |
9a706b42 | 1258 | struct community *comm; |
d04ac434 | 1259 | |
d62a17ae | 1260 | if (attr->aspath && !attr->aspath->refcnt) { |
1261 | aspath_free(attr->aspath); | |
1262 | attr->aspath = NULL; | |
1263 | } | |
9a706b42 DA |
1264 | comm = bgp_attr_get_community(attr); |
1265 | if (comm && !comm->refcnt) | |
1266 | community_free(&comm); | |
1267 | bgp_attr_set_community(attr, NULL); | |
1268 | ||
b53e67a3 | 1269 | ecomm = bgp_attr_get_ecommunity(attr); |
d04ac434 DS |
1270 | if (ecomm && !ecomm->refcnt) |
1271 | ecommunity_free(&ecomm); | |
b53e67a3 | 1272 | bgp_attr_set_ecommunity(attr, NULL); |
9a706b42 | 1273 | |
b53e67a3 DA |
1274 | ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr); |
1275 | if (ipv6_ecomm && !ipv6_ecomm->refcnt) | |
1276 | ecommunity_free(&ipv6_ecomm); | |
d04ac434 | 1277 | bgp_attr_set_ipv6_ecommunity(attr, NULL); |
9a706b42 | 1278 | |
1bcf3a96 DA |
1279 | lcomm = bgp_attr_get_lcommunity(attr); |
1280 | if (lcomm && !lcomm->refcnt) | |
1281 | lcommunity_free(&lcomm); | |
1282 | bgp_attr_set_lcommunity(attr, NULL); | |
779fee93 DS |
1283 | |
1284 | cluster = bgp_attr_get_cluster(attr); | |
1285 | if (cluster && !cluster->refcnt) { | |
1286 | cluster_free(cluster); | |
1287 | bgp_attr_set_cluster(attr, NULL); | |
d62a17ae | 1288 | } |
04fb21e2 DS |
1289 | |
1290 | struct transit *transit = bgp_attr_get_transit(attr); | |
1291 | ||
1292 | if (transit && !transit->refcnt) { | |
1293 | transit_free(transit); | |
1294 | bgp_attr_set_transit(attr, NULL); | |
d62a17ae | 1295 | } |
1296 | if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) { | |
1297 | encap_free(attr->encap_subtlvs); | |
1298 | attr->encap_subtlvs = NULL; | |
1299 | } | |
b83127e1 HS |
1300 | if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) { |
1301 | srv6_l3vpn_free(attr->srv6_l3vpn); | |
1302 | attr->srv6_l3vpn = NULL; | |
1303 | } | |
1304 | if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) { | |
1305 | srv6_vpn_free(attr->srv6_vpn); | |
1306 | attr->srv6_vpn = NULL; | |
1307 | } | |
1e20238a | 1308 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
1309 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
1310 | bgp_attr_get_vnc_subtlvs(attr); | |
1311 | ||
1312 | if (vnc_subtlvs && !vnc_subtlvs->refcnt) { | |
1313 | encap_free(vnc_subtlvs); | |
1314 | bgp_attr_set_vnc_subtlvs(attr, NULL); | |
d62a17ae | 1315 | } |
aadc0905 | 1316 | #endif |
718e3744 | 1317 | } |
1318 | ||
b881c707 PJ |
1319 | /* Implement draft-scudder-idr-optional-transitive behaviour and |
1320 | * avoid resetting sessions for malformed attributes which are | |
1321 | * are partial/optional and hence where the error likely was not | |
1322 | * introduced by the sending neighbour. | |
1323 | */ | |
79288e4c | 1324 | static enum bgp_attr_parse_ret |
d7c0a89a | 1325 | bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, |
d62a17ae | 1326 | bgp_size_t length) |
1327 | { | |
1328 | struct peer *const peer = args->peer; | |
599f7b33 | 1329 | struct attr *const attr = args->attr; |
d7c0a89a | 1330 | const uint8_t flags = args->flags; |
d62a17ae | 1331 | /* startp and length must be special-cased, as whether or not to |
1332 | * send the attribute data with the NOTIFY depends on the error, | |
1333 | * the caller therefore signals this with the seperate length argument | |
1334 | */ | |
d7c0a89a | 1335 | uint8_t *notify_datap = (length > 0 ? args->startp : NULL); |
d62a17ae | 1336 | |
599f7b33 DA |
1337 | if (bgp_debug_update(peer, NULL, NULL, 1)) { |
1338 | char attr_str[BUFSIZ] = {0}; | |
1339 | ||
99ab4d23 | 1340 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); |
599f7b33 DA |
1341 | |
1342 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1343 | } | |
1344 | ||
d62a17ae | 1345 | /* Only relax error handling for eBGP peers */ |
1346 | if (peer->sort != BGP_PEER_EBGP) { | |
1347 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, | |
1348 | notify_datap, length); | |
1349 | return BGP_ATTR_PARSE_ERROR; | |
1350 | } | |
1351 | ||
1352 | /* Adjust the stream getp to the end of the attribute, in case we can | |
1353 | * still proceed but the caller hasn't read all the attribute. | |
1354 | */ | |
1355 | stream_set_getp(BGP_INPUT(peer), | |
1356 | (args->startp - STREAM_DATA(BGP_INPUT(peer))) | |
1357 | + args->total); | |
1358 | ||
1359 | switch (args->type) { | |
1360 | /* where an attribute is relatively inconsequential, e.g. it does not | |
1361 | * affect route selection, and can be safely ignored, then any such | |
1362 | * attributes which are malformed should just be ignored and the route | |
1363 | * processed as normal. | |
1364 | */ | |
1365 | case BGP_ATTR_AS4_AGGREGATOR: | |
1366 | case BGP_ATTR_AGGREGATOR: | |
1367 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
1368 | return BGP_ATTR_PARSE_PROCEED; | |
1369 | ||
1370 | /* Core attributes, particularly ones which may influence route | |
4ba5a9c5 | 1371 | * selection, should be treat-as-withdraw. |
d62a17ae | 1372 | */ |
1373 | case BGP_ATTR_ORIGIN: | |
1374 | case BGP_ATTR_AS_PATH: | |
1375 | case BGP_ATTR_NEXT_HOP: | |
1376 | case BGP_ATTR_MULTI_EXIT_DISC: | |
1377 | case BGP_ATTR_LOCAL_PREF: | |
1378 | case BGP_ATTR_COMMUNITIES: | |
4ba5a9c5 | 1379 | case BGP_ATTR_EXT_COMMUNITIES: |
9a659715 | 1380 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
4ba5a9c5 | 1381 | case BGP_ATTR_LARGE_COMMUNITIES: |
d62a17ae | 1382 | case BGP_ATTR_ORIGINATOR_ID: |
1383 | case BGP_ATTR_CLUSTER_LIST: | |
adc1c459 | 1384 | case BGP_ATTR_OTC: |
4ba5a9c5 | 1385 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1386 | case BGP_ATTR_MP_REACH_NLRI: |
1387 | case BGP_ATTR_MP_UNREACH_NLRI: | |
d62a17ae | 1388 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode, |
1389 | notify_datap, length); | |
1390 | return BGP_ATTR_PARSE_ERROR; | |
1391 | } | |
1392 | ||
1393 | /* Partial optional attributes that are malformed should not cause | |
1394 | * the whole session to be reset. Instead treat it as a withdrawal | |
1395 | * of the routes, if possible. | |
1396 | */ | |
1397 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS) | |
1398 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1399 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) | |
1400 | return BGP_ATTR_PARSE_WITHDRAW; | |
1401 | ||
1402 | /* default to reset */ | |
1403 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
b881c707 PJ |
1404 | } |
1405 | ||
afcb7679 DO |
1406 | /* Find out what is wrong with the path attribute flag bits and log the error. |
1407 | "Flag bits" here stand for Optional, Transitive and Partial, but not for | |
1408 | Extended Length. Checking O/T/P bits at once implies, that the attribute | |
1409 | being diagnosed is defined by RFC as either a "well-known" or an "optional, | |
1410 | non-transitive" attribute. */ | |
1411 | static void | |
d62a17ae | 1412 | bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args, |
d7c0a89a QY |
1413 | uint8_t desired_flags /* how RFC says it must be */ |
1414 | ) | |
d62a17ae | 1415 | { |
d7c0a89a QY |
1416 | uint8_t seen = 0, i; |
1417 | uint8_t real_flags = args->flags; | |
1418 | const uint8_t attr_code = args->type; | |
d62a17ae | 1419 | |
1420 | desired_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1421 | real_flags &= ~BGP_ATTR_FLAG_EXTLEN; | |
1422 | for (i = 0; i <= 2; i++) /* O,T,P, but not E */ | |
1423 | if (CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1424 | != CHECK_FLAG(real_flags, attr_flag_str[i].key)) { | |
1c50c1c0 QY |
1425 | flog_err(EC_BGP_ATTR_FLAG, |
1426 | "%s attribute must%s be flagged as \"%s\"", | |
1427 | lookup_msg(attr_str, attr_code, NULL), | |
1428 | CHECK_FLAG(desired_flags, attr_flag_str[i].key) | |
1429 | ? "" | |
1430 | : " not", | |
1431 | attr_flag_str[i].str); | |
d62a17ae | 1432 | seen = 1; |
1433 | } | |
1434 | if (!seen) { | |
1435 | zlog_debug( | |
3efd0893 | 1436 | "Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)", |
d62a17ae | 1437 | __func__, lookup_msg(attr_str, attr_code, NULL), |
1438 | real_flags, desired_flags); | |
1439 | } | |
afcb7679 DO |
1440 | } |
1441 | ||
3ecab4c8 PJ |
1442 | /* Required flags for attributes. EXTLEN will be masked off when testing, |
1443 | * as will PARTIAL for optional+transitive attributes. | |
1444 | */ | |
d7c0a89a QY |
1445 | const uint8_t attr_flags_values[] = { |
1446 | [BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS, | |
1447 | [BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS, | |
1448 | [BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS, | |
1449 | [BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL, | |
1450 | [BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS, | |
1451 | [BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS, | |
1452 | [BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1453 | [BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL, | |
1454 | [BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL, | |
1455 | [BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL, | |
1456 | [BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1457 | [BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL, | |
1458 | [BGP_ATTR_EXT_COMMUNITIES] = | |
1459 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1460 | [BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1461 | [BGP_ATTR_AS4_AGGREGATOR] = | |
1462 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1463 | [BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
1464 | [BGP_ATTR_LARGE_COMMUNITIES] = | |
1465 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
d864dd9e | 1466 | [BGP_ATTR_OTC] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
d7c0a89a | 1467 | [BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
9a659715 PG |
1468 | [BGP_ATTR_IPV6_EXT_COMMUNITIES] = |
1469 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, | |
97a52c82 | 1470 | [BGP_ATTR_AIGP] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS, |
3ecab4c8 | 1471 | }; |
099111ef | 1472 | static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1; |
3ecab4c8 | 1473 | |
3dc339cd | 1474 | static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args) |
d62a17ae | 1475 | { |
d7c0a89a QY |
1476 | uint8_t mask = BGP_ATTR_FLAG_EXTLEN; |
1477 | const uint8_t flags = args->flags; | |
1478 | const uint8_t attr_code = args->type; | |
d62a17ae | 1479 | |
1480 | /* there may be attributes we don't know about */ | |
1481 | if (attr_code > attr_flags_values_max) | |
3dc339cd | 1482 | return false; |
d62a17ae | 1483 | if (attr_flags_values[attr_code] == 0) |
3dc339cd | 1484 | return false; |
d62a17ae | 1485 | |
1486 | /* RFC4271, "For well-known attributes, the Transitive bit MUST be set | |
1487 | * to | |
1488 | * 1." | |
1489 | */ | |
1490 | if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags) | |
1491 | && !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) { | |
af4c2728 | 1492 | flog_err( |
e50f7cfd | 1493 | EC_BGP_ATTR_FLAG, |
d62a17ae | 1494 | "%s well-known attributes must have transitive flag set (%x)", |
1495 | lookup_msg(attr_str, attr_code, NULL), flags); | |
3dc339cd | 1496 | return true; |
d62a17ae | 1497 | } |
1498 | ||
1499 | /* "For well-known attributes and for optional non-transitive | |
1500 | * attributes, | |
1501 | * the Partial bit MUST be set to 0." | |
1502 | */ | |
1503 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) { | |
1504 | if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) { | |
e50f7cfd | 1505 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1506 | "%s well-known attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1507 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1508 | return true; |
d62a17ae | 1509 | } |
1510 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1511 | && !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) { | |
e50f7cfd | 1512 | flog_err(EC_BGP_ATTR_FLAG, |
3efd0893 | 1513 | "%s optional + transitive attribute must NOT have the partial flag set (%x)", |
1c50c1c0 | 1514 | lookup_msg(attr_str, attr_code, NULL), flags); |
3dc339cd | 1515 | return true; |
d62a17ae | 1516 | } |
1517 | } | |
1518 | ||
1519 | /* Optional transitive attributes may go through speakers that don't | |
1520 | * reocgnise them and set the Partial bit. | |
1521 | */ | |
1522 | if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL) | |
1523 | && CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) | |
1524 | SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL); | |
1525 | ||
1526 | if ((flags & ~mask) == attr_flags_values[attr_code]) | |
3dc339cd | 1527 | return false; |
d62a17ae | 1528 | |
1529 | bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]); | |
3dc339cd | 1530 | return true; |
3ecab4c8 PJ |
1531 | } |
1532 | ||
718e3744 | 1533 | /* Get origin attribute of the update message. */ |
79288e4c DA |
1534 | static enum bgp_attr_parse_ret |
1535 | bgp_attr_origin(struct bgp_attr_parser_args *args) | |
d62a17ae | 1536 | { |
1537 | struct peer *const peer = args->peer; | |
1538 | struct attr *const attr = args->attr; | |
1539 | const bgp_size_t length = args->length; | |
1540 | ||
1541 | /* If any recognized attribute has Attribute Length that conflicts | |
1542 | with the expected length (based on the attribute type code), then | |
1543 | the Error Subcode is set to Attribute Length Error. The Data | |
1544 | field contains the erroneous attribute (type, length and | |
1545 | value). */ | |
1546 | if (length != 1) { | |
e50f7cfd | 1547 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1548 | "Origin attribute length is not one %d", length); |
d62a17ae | 1549 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1550 | args->total); | |
1551 | } | |
1552 | ||
1553 | /* Fetch origin attribute. */ | |
1554 | attr->origin = stream_getc(BGP_INPUT(peer)); | |
1555 | ||
1556 | /* If the ORIGIN attribute has an undefined value, then the Error | |
1557 | Subcode is set to Invalid Origin Attribute. The Data field | |
1558 | contains the unrecognized attribute (type, length and value). */ | |
1559 | if ((attr->origin != BGP_ORIGIN_IGP) && (attr->origin != BGP_ORIGIN_EGP) | |
1560 | && (attr->origin != BGP_ORIGIN_INCOMPLETE)) { | |
e50f7cfd | 1561 | flog_err(EC_BGP_ATTR_ORIGIN, |
1c50c1c0 | 1562 | "Origin attribute value is invalid %d", attr->origin); |
d62a17ae | 1563 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN, |
1564 | args->total); | |
1565 | } | |
1566 | ||
1567 | /* Set oring attribute flag. */ | |
1568 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGIN); | |
1569 | ||
1570 | return 0; | |
718e3744 | 1571 | } |
ab005298 PJ |
1572 | |
1573 | /* Parse AS path information. This function is wrapper of | |
1574 | aspath_parse. */ | |
d62a17ae | 1575 | static int bgp_attr_aspath(struct bgp_attr_parser_args *args) |
1576 | { | |
1577 | struct attr *const attr = args->attr; | |
1578 | struct peer *const peer = args->peer; | |
1579 | const bgp_size_t length = args->length; | |
17571c4a | 1580 | enum asnotation_mode asnotation; |
d62a17ae | 1581 | |
17571c4a PG |
1582 | asnotation = bgp_get_asnotation( |
1583 | args->peer && args->peer->bgp ? args->peer->bgp : NULL); | |
d62a17ae | 1584 | /* |
1585 | * peer with AS4 => will get 4Byte ASnums | |
1586 | * otherwise, will get 16 Bit | |
1587 | */ | |
17571c4a PG |
1588 | attr->aspath = |
1589 | aspath_parse(peer->curr, length, | |
1590 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) && | |
1591 | CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV), | |
1592 | asnotation); | |
d62a17ae | 1593 | |
1594 | /* In case of IBGP, length will be zero. */ | |
1595 | if (!attr->aspath) { | |
e50f7cfd | 1596 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1597 | "Malformed AS path from %s, length is %d", peer->host, |
1598 | length); | |
d62a17ae | 1599 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1600 | 0); | |
1601 | } | |
0b2aa3a0 | 1602 | |
1bd36763 DA |
1603 | /* Conformant BGP speakers SHOULD NOT send BGP |
1604 | * UPDATE messages containing AS_SET or AS_CONFED_SET. Upon receipt of | |
1605 | * such messages, conformant BGP speakers SHOULD use the "Treat-as- | |
1606 | * withdraw" error handling behavior as per [RFC7606]. | |
1607 | */ | |
629d84f5 PG |
1608 | if (peer->bgp && peer->bgp->reject_as_sets && |
1609 | aspath_check_as_sets(attr->aspath)) { | |
1bd36763 DA |
1610 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1611 | "AS_SET and AS_CONFED_SET are deprecated from %pBP", | |
1612 | peer); | |
1613 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1614 | 0); | |
1615 | } | |
1616 | ||
d62a17ae | 1617 | /* Set aspath attribute flag. */ |
1618 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH); | |
1619 | ||
1620 | return BGP_ATTR_PARSE_PROCEED; | |
1621 | } | |
1622 | ||
79288e4c DA |
1623 | static enum bgp_attr_parse_ret bgp_attr_aspath_check(struct peer *const peer, |
1624 | struct attr *const attr) | |
d62a17ae | 1625 | { |
1626 | /* These checks were part of bgp_attr_aspath, but with | |
1627 | * as4 we should to check aspath things when | |
1628 | * aspath synthesizing with as4_path has already taken place. | |
1629 | * Otherwise we check ASPATH and use the synthesized thing, and that is | |
1630 | * not right. | |
1631 | * So do the checks later, i.e. here | |
1632 | */ | |
d62a17ae | 1633 | struct aspath *aspath; |
1634 | ||
db5a5ee6 DA |
1635 | /* Refresh peer's type. If we set e.g.: AS_EXTERNAL/AS_INTERNAL, |
1636 | * then peer->sort remains BGP_PEER_EBGP/IBGP, hence we need to | |
1637 | * have an actual type before checking. | |
1638 | * This is especially a case for BGP confederation peers, to avoid | |
1639 | * receiving and treating AS_PATH as malformed. | |
1640 | */ | |
1641 | (void)peer_sort(peer); | |
1642 | ||
d62a17ae | 1643 | /* Confederation sanity check. */ |
1644 | if ((peer->sort == BGP_PEER_CONFED | |
1645 | && !aspath_left_confed_check(attr->aspath)) | |
1646 | || (peer->sort == BGP_PEER_EBGP | |
1647 | && aspath_confed_check(attr->aspath))) { | |
e50f7cfd | 1648 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s", |
1c50c1c0 | 1649 | peer->host); |
4ba5a9c5 | 1650 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1651 | } |
cddb8112 | 1652 | |
d62a17ae | 1653 | /* First AS check for EBGP. */ |
47cbc09b | 1654 | if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) { |
d62a17ae | 1655 | if (peer->sort == BGP_PEER_EBGP |
1656 | && !aspath_firstas_check(attr->aspath, peer->as)) { | |
e50f7cfd | 1657 | flog_err(EC_BGP_ATTR_FIRST_AS, |
1c50c1c0 QY |
1658 | "%s incorrect first AS (must be %u)", |
1659 | peer->host, peer->as); | |
4ba5a9c5 | 1660 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 1661 | } |
1662 | } | |
0b2aa3a0 | 1663 | |
88cc0ce4 DA |
1664 | /* Codification of AS 0 Processing */ |
1665 | if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) { | |
1666 | flog_err( | |
1667 | EC_BGP_ATTR_MAL_AS_PATH, | |
1668 | "Malformed AS path, AS number is 0 in the path from %s", | |
1669 | peer->host); | |
1670 | return BGP_ATTR_PARSE_WITHDRAW; | |
1671 | } | |
1672 | ||
d62a17ae | 1673 | /* local-as prepend */ |
1674 | if (peer->change_local_as | |
1675 | && !CHECK_FLAG(peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND)) { | |
1676 | aspath = aspath_dup(attr->aspath); | |
1677 | aspath = aspath_add_seq(aspath, peer->change_local_as); | |
1678 | aspath_unintern(&attr->aspath); | |
1679 | attr->aspath = aspath_intern(aspath); | |
1680 | } | |
0b2aa3a0 | 1681 | |
d62a17ae | 1682 | return BGP_ATTR_PARSE_PROCEED; |
0b2aa3a0 PJ |
1683 | } |
1684 | ||
ab005298 PJ |
1685 | /* Parse AS4 path information. This function is another wrapper of |
1686 | aspath_parse. */ | |
d62a17ae | 1687 | static int bgp_attr_as4_path(struct bgp_attr_parser_args *args, |
1688 | struct aspath **as4_path) | |
ab005298 | 1689 | { |
d62a17ae | 1690 | struct peer *const peer = args->peer; |
1691 | struct attr *const attr = args->attr; | |
1692 | const bgp_size_t length = args->length; | |
17571c4a | 1693 | enum asnotation_mode asnotation; |
ab005298 | 1694 | |
17571c4a | 1695 | asnotation = bgp_get_asnotation(peer->bgp); |
ab005298 | 1696 | |
17571c4a | 1697 | *as4_path = aspath_parse(peer->curr, length, 1, asnotation); |
b881c707 | 1698 | |
d62a17ae | 1699 | /* In case of IBGP, length will be zero. */ |
1700 | if (!*as4_path) { | |
e50f7cfd | 1701 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, |
1c50c1c0 QY |
1702 | "Malformed AS4 path from %s, length is %d", peer->host, |
1703 | length); | |
d62a17ae | 1704 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, |
1705 | 0); | |
1706 | } | |
ab005298 | 1707 | |
1bd36763 DA |
1708 | /* Conformant BGP speakers SHOULD NOT send BGP |
1709 | * UPDATE messages containing AS_SET or AS_CONFED_SET. Upon receipt of | |
1710 | * such messages, conformant BGP speakers SHOULD use the "Treat-as- | |
1711 | * withdraw" error handling behavior as per [RFC7606]. | |
1712 | */ | |
1713 | if (peer->bgp->reject_as_sets && aspath_check_as_sets(attr->aspath)) { | |
1714 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, | |
1715 | "AS_SET and AS_CONFED_SET are deprecated from %pBP", | |
1716 | peer); | |
1717 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
1718 | 0); | |
1719 | } | |
1720 | ||
d62a17ae | 1721 | /* Set aspath attribute flag. */ |
1722 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH); | |
1723 | ||
1724 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
1725 | } |
1726 | ||
9738e9aa | 1727 | /* |
1728 | * Check that the nexthop attribute is valid. | |
1729 | */ | |
79288e4c DA |
1730 | enum bgp_attr_parse_ret bgp_attr_nexthop_valid(struct peer *peer, |
1731 | struct attr *attr) | |
9738e9aa | 1732 | { |
8666265e | 1733 | struct bgp *bgp = peer->bgp; |
9738e9aa | 1734 | |
70632160 | 1735 | if (ipv4_martian(&attr->nexthop) && !bgp->allow_martian) { |
7decb30c | 1736 | uint8_t data[7]; /* type(2) + length(1) + nhop(4) */ |
9738e9aa | 1737 | |
07380148 DA |
1738 | flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %pI4", |
1739 | &attr->nexthop); | |
7decb30c DS |
1740 | data[0] = BGP_ATTR_FLAG_TRANS; |
1741 | data[1] = BGP_ATTR_NEXT_HOP; | |
1742 | data[2] = BGP_ATTR_NHLEN_IPV4; | |
1743 | memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4); | |
1744 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
1745 | BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP, | |
1746 | data, 7); | |
9738e9aa | 1747 | return BGP_ATTR_PARSE_ERROR; |
1748 | } | |
1749 | ||
1750 | return BGP_ATTR_PARSE_PROCEED; | |
1751 | } | |
1752 | ||
718e3744 | 1753 | /* Nexthop attribute. */ |
79288e4c DA |
1754 | static enum bgp_attr_parse_ret |
1755 | bgp_attr_nexthop(struct bgp_attr_parser_args *args) | |
d62a17ae | 1756 | { |
1757 | struct peer *const peer = args->peer; | |
1758 | struct attr *const attr = args->attr; | |
1759 | const bgp_size_t length = args->length; | |
1760 | ||
d62a17ae | 1761 | /* Check nexthop attribute length. */ |
1762 | if (length != 4) { | |
e50f7cfd | 1763 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1764 | "Nexthop attribute length isn't four [%d]", length); |
d62a17ae | 1765 | |
1766 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1767 | args->total); | |
1768 | } | |
1769 | ||
88f33d66 | 1770 | attr->nexthop.s_addr = stream_get_ipv4(peer->curr); |
d62a17ae | 1771 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP); |
1772 | ||
1773 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 1774 | } |
1775 | ||
1776 | /* MED atrribute. */ | |
79288e4c | 1777 | static enum bgp_attr_parse_ret bgp_attr_med(struct bgp_attr_parser_args *args) |
718e3744 | 1778 | { |
d62a17ae | 1779 | struct peer *const peer = args->peer; |
1780 | struct attr *const attr = args->attr; | |
1781 | const bgp_size_t length = args->length; | |
b881c707 | 1782 | |
d62a17ae | 1783 | /* Length check. */ |
1784 | if (length != 4) { | |
e50f7cfd | 1785 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1786 | "MED attribute length isn't four [%d]", length); |
718e3744 | 1787 | |
d62a17ae | 1788 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1789 | args->total); | |
1790 | } | |
1791 | ||
424ab01d | 1792 | attr->med = stream_getl(peer->curr); |
718e3744 | 1793 | |
d62a17ae | 1794 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC); |
718e3744 | 1795 | |
d62a17ae | 1796 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 1797 | } |
1798 | ||
1799 | /* Local preference attribute. */ | |
79288e4c | 1800 | static enum bgp_attr_parse_ret |
d62a17ae | 1801 | bgp_attr_local_pref(struct bgp_attr_parser_args *args) |
1802 | { | |
1803 | struct peer *const peer = args->peer; | |
1804 | struct attr *const attr = args->attr; | |
1805 | const bgp_size_t length = args->length; | |
1806 | ||
4ba5a9c5 DA |
1807 | /* if received from an internal neighbor, it SHALL be considered |
1808 | * malformed if its length is not equal to 4. If malformed, the | |
1809 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
1810 | * withdraw". | |
1811 | */ | |
1812 | if (peer->sort == BGP_PEER_IBGP && length != 4) { | |
e50f7cfd | 1813 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 | 1814 | "LOCAL_PREF attribute length isn't 4 [%u]", length); |
d62a17ae | 1815 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1816 | args->total); | |
1817 | } | |
1818 | ||
1819 | /* If it is contained in an UPDATE message that is received from an | |
1820 | external peer, then this attribute MUST be ignored by the | |
1821 | receiving speaker. */ | |
1822 | if (peer->sort == BGP_PEER_EBGP) { | |
ad61f778 | 1823 | STREAM_FORWARD_GETP(peer->curr, length); |
d62a17ae | 1824 | return BGP_ATTR_PARSE_PROCEED; |
1825 | } | |
1826 | ||
ad61f778 | 1827 | STREAM_GETL(peer->curr, attr->local_pref); |
d62a17ae | 1828 | |
7f323236 | 1829 | /* Set the local-pref flag. */ |
d62a17ae | 1830 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF); |
1831 | ||
1832 | return BGP_ATTR_PARSE_PROCEED; | |
ad61f778 QY |
1833 | |
1834 | stream_failure: | |
1835 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
1836 | args->total); | |
718e3744 | 1837 | } |
1838 | ||
1839 | /* Atomic aggregate. */ | |
d62a17ae | 1840 | static int bgp_attr_atomic(struct bgp_attr_parser_args *args) |
718e3744 | 1841 | { |
a5c6a9b1 | 1842 | struct peer *const peer = args->peer; |
d62a17ae | 1843 | struct attr *const attr = args->attr; |
1844 | const bgp_size_t length = args->length; | |
1845 | ||
1846 | /* Length check. */ | |
1847 | if (length != 0) { | |
e50f7cfd | 1848 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1849 | "ATOMIC_AGGREGATE attribute length isn't 0 [%u]", |
1850 | length); | |
d62a17ae | 1851 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1852 | args->total); | |
1853 | } | |
718e3744 | 1854 | |
e2863b4f | 1855 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
1856 | goto atomic_ignore; |
1857 | ||
d62a17ae | 1858 | /* Set atomic aggregate flag. */ |
1859 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE); | |
718e3744 | 1860 | |
d62a17ae | 1861 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1862 | |
1863 | atomic_ignore: | |
1864 | stream_forward_getp(peer->curr, length); | |
1865 | ||
e2863b4f | 1866 | return bgp_attr_ignore(peer, args->type); |
718e3744 | 1867 | } |
1868 | ||
1869 | /* Aggregator attribute */ | |
d62a17ae | 1870 | static int bgp_attr_aggregator(struct bgp_attr_parser_args *args) |
1871 | { | |
1872 | struct peer *const peer = args->peer; | |
1873 | struct attr *const attr = args->attr; | |
1874 | const bgp_size_t length = args->length; | |
33d022bc | 1875 | as_t aggregator_as; |
d62a17ae | 1876 | |
1877 | int wantedlen = 6; | |
1878 | ||
1879 | /* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */ | |
4ba5a9c5 DA |
1880 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
1881 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV)) | |
d62a17ae | 1882 | wantedlen = 8; |
1883 | ||
1884 | if (length != wantedlen) { | |
e50f7cfd | 1885 | flog_err(EC_BGP_ATTR_LEN, |
1c50c1c0 QY |
1886 | "AGGREGATOR attribute length isn't %u [%u]", wantedlen, |
1887 | length); | |
d62a17ae | 1888 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1889 | args->total); | |
1890 | } | |
1891 | ||
e2863b4f | 1892 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
1893 | goto aggregator_ignore; |
1894 | ||
d62a17ae | 1895 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) |
33d022bc | 1896 | aggregator_as = stream_getl(peer->curr); |
d62a17ae | 1897 | else |
33d022bc DA |
1898 | aggregator_as = stream_getw(peer->curr); |
1899 | ||
e8364238 DA |
1900 | attr->aggregator_as = aggregator_as; |
1901 | attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr); | |
1902 | ||
33d022bc | 1903 | /* Codification of AS 0 Processing */ |
4877b70b | 1904 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1905 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1906 | "%s: AGGREGATOR AS number is 0 for aspath: %s", |
1907 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1908 | |
1909 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1910 | char attr_str[BUFSIZ] = {0}; | |
1911 | ||
1912 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1913 | ||
1914 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1915 | } | |
1916 | } else { | |
8085c9a7 | 1917 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR); |
4877b70b | 1918 | } |
33d022bc | 1919 | |
d62a17ae | 1920 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1921 | |
1922 | aggregator_ignore: | |
1923 | stream_forward_getp(peer->curr, length); | |
1924 | ||
e2863b4f | 1925 | return bgp_attr_ignore(peer, args->type); |
718e3744 | 1926 | } |
1927 | ||
0b2aa3a0 | 1928 | /* New Aggregator attribute */ |
79288e4c | 1929 | static enum bgp_attr_parse_ret |
d62a17ae | 1930 | bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args, |
1931 | as_t *as4_aggregator_as, | |
1932 | struct in_addr *as4_aggregator_addr) | |
1933 | { | |
1934 | struct peer *const peer = args->peer; | |
1935 | struct attr *const attr = args->attr; | |
1936 | const bgp_size_t length = args->length; | |
33d022bc | 1937 | as_t aggregator_as; |
d62a17ae | 1938 | |
1939 | if (length != 8) { | |
1c50c1c0 QY |
1940 | flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]", |
1941 | length); | |
d62a17ae | 1942 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
1943 | 0); | |
1944 | } | |
1945 | ||
e2863b4f | 1946 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
1947 | goto as4_aggregator_ignore; |
1948 | ||
33d022bc | 1949 | aggregator_as = stream_getl(peer->curr); |
0f2a703d | 1950 | |
e8364238 DA |
1951 | *as4_aggregator_as = aggregator_as; |
1952 | as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr); | |
1953 | ||
0f2a703d | 1954 | /* Codification of AS 0 Processing */ |
4877b70b | 1955 | if (aggregator_as == BGP_AS_ZERO) { |
33d022bc | 1956 | flog_err(EC_BGP_ATTR_LEN, |
8085c9a7 DA |
1957 | "%s: AS4_AGGREGATOR AS number is 0 for aspath: %s", |
1958 | peer->host, aspath_print(attr->aspath)); | |
4877b70b DA |
1959 | |
1960 | if (bgp_debug_update(peer, NULL, NULL, 1)) { | |
1961 | char attr_str[BUFSIZ] = {0}; | |
1962 | ||
1963 | bgp_dump_attr(attr, attr_str, sizeof(attr_str)); | |
1964 | ||
1965 | zlog_debug("%s: attributes: %s", __func__, attr_str); | |
1966 | } | |
1967 | } else { | |
8085c9a7 | 1968 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR); |
4877b70b | 1969 | } |
33d022bc | 1970 | |
d62a17ae | 1971 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
1972 | |
1973 | as4_aggregator_ignore: | |
1974 | stream_forward_getp(peer->curr, length); | |
1975 | ||
e2863b4f | 1976 | return bgp_attr_ignore(peer, args->type); |
0b2aa3a0 PJ |
1977 | } |
1978 | ||
1979 | /* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH. | |
1980 | */ | |
79288e4c | 1981 | static enum bgp_attr_parse_ret |
d62a17ae | 1982 | bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr, |
1983 | struct aspath *as4_path, as_t as4_aggregator, | |
1984 | struct in_addr *as4_aggregator_addr) | |
1985 | { | |
1986 | int ignore_as4_path = 0; | |
1987 | struct aspath *newpath; | |
1988 | ||
1989 | if (!attr->aspath) { | |
1990 | /* NULL aspath shouldn't be possible as bgp_attr_parse should | |
1991 | * have | |
1992 | * checked that all well-known, mandatory attributes were | |
1993 | * present. | |
1994 | * | |
1995 | * Can only be a problem with peer itself - hard error | |
1996 | */ | |
1997 | return BGP_ATTR_PARSE_ERROR; | |
1998 | } | |
1999 | ||
2000 | if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)) { | |
2001 | /* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR | |
2002 | * if given. | |
2003 | * It is worth a warning though, because the peer really | |
2004 | * should not send them | |
2005 | */ | |
2006 | if (BGP_DEBUG(as4, AS4)) { | |
2007 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH))) | |
2008 | zlog_debug("[AS4] %s %s AS4_PATH", peer->host, | |
2009 | "AS4 capable peer, yet it sent"); | |
2010 | ||
2011 | if (attr->flag | |
2012 | & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) | |
2013 | zlog_debug("[AS4] %s %s AS4_AGGREGATOR", | |
2014 | peer->host, | |
2015 | "AS4 capable peer, yet it sent"); | |
2016 | } | |
2017 | ||
2018 | return BGP_ATTR_PARSE_PROCEED; | |
2019 | } | |
2020 | ||
2021 | /* We have a asn16 peer. First, look for AS4_AGGREGATOR | |
2022 | * because that may override AS4_PATH | |
2023 | */ | |
2024 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR))) { | |
2025 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR))) { | |
2026 | /* received both. | |
2027 | * if the as_number in aggregator is not AS_TRANS, | |
2028 | * then AS4_AGGREGATOR and AS4_PATH shall be ignored | |
2029 | * and the Aggregator shall be taken as | |
2030 | * info on the aggregating node, and the AS_PATH | |
2031 | * shall be taken as the AS_PATH | |
2032 | * otherwise | |
2033 | * the Aggregator shall be ignored and the | |
2034 | * AS4_AGGREGATOR shall be taken as the | |
2035 | * Aggregating node and the AS_PATH is to be | |
2036 | * constructed "as in all other cases" | |
2037 | */ | |
2038 | if (attr->aggregator_as != BGP_AS_TRANS) { | |
2039 | /* ignore */ | |
2040 | if (BGP_DEBUG(as4, AS4)) | |
2041 | zlog_debug( | |
3efd0893 | 2042 | "[AS4] %s BGP not AS4 capable peer send AGGREGATOR != AS_TRANS and AS4_AGGREGATOR, so ignore AS4_AGGREGATOR and AS4_PATH", |
d62a17ae | 2043 | peer->host); |
2044 | ignore_as4_path = 1; | |
2045 | } else { | |
2046 | /* "New_aggregator shall be taken as aggregator" | |
2047 | */ | |
2048 | attr->aggregator_as = as4_aggregator; | |
2049 | attr->aggregator_addr.s_addr = | |
2050 | as4_aggregator_addr->s_addr; | |
2051 | } | |
2052 | } else { | |
2053 | /* We received a AS4_AGGREGATOR but no AGGREGATOR. | |
2054 | * That is bogus - but reading the conditions | |
2055 | * we have to handle AS4_AGGREGATOR as if it were | |
2056 | * AGGREGATOR in that case | |
2057 | */ | |
2058 | if (BGP_DEBUG(as4, AS4)) | |
2059 | zlog_debug( | |
3efd0893 | 2060 | "[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 | 2061 | peer->host); |
2062 | attr->aggregator_as = as4_aggregator; | |
2063 | /* sweep it under the carpet and simulate a "good" | |
2064 | * AGGREGATOR */ | |
2065 | attr->flag |= (ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)); | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | /* need to reconcile NEW_AS_PATH and AS_PATH */ | |
2070 | if (!ignore_as4_path | |
2071 | && (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))) { | |
2072 | newpath = aspath_reconcile_as4(attr->aspath, as4_path); | |
e8a3a0a0 | 2073 | if (!newpath) |
2074 | return BGP_ATTR_PARSE_ERROR; | |
2075 | ||
d62a17ae | 2076 | aspath_unintern(&attr->aspath); |
2077 | attr->aspath = aspath_intern(newpath); | |
2078 | } | |
2079 | return BGP_ATTR_PARSE_PROCEED; | |
0b2aa3a0 PJ |
2080 | } |
2081 | ||
718e3744 | 2082 | /* Community attribute. */ |
79288e4c | 2083 | static enum bgp_attr_parse_ret |
d62a17ae | 2084 | bgp_attr_community(struct bgp_attr_parser_args *args) |
2085 | { | |
2086 | struct peer *const peer = args->peer; | |
2087 | struct attr *const attr = args->attr; | |
2088 | const bgp_size_t length = args->length; | |
2089 | ||
2090 | if (length == 0) { | |
9a706b42 | 2091 | bgp_attr_set_community(attr, NULL); |
6680b550 DA |
2092 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2093 | args->total); | |
d62a17ae | 2094 | } |
2095 | ||
e2863b4f | 2096 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
2097 | goto community_ignore; |
2098 | ||
9a706b42 DA |
2099 | bgp_attr_set_community( |
2100 | attr, | |
2101 | community_parse((uint32_t *)stream_pnt(peer->curr), length)); | |
d62a17ae | 2102 | |
2103 | /* XXX: fix community_parse to use stream API and remove this */ | |
424ab01d | 2104 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2105 | |
4ba5a9c5 DA |
2106 | /* The Community attribute SHALL be considered malformed if its |
2107 | * length is not a non-zero multiple of 4. | |
2108 | */ | |
9a706b42 | 2109 | if (!bgp_attr_get_community(attr)) |
d62a17ae | 2110 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2111 | args->total); | |
2112 | ||
d62a17ae | 2113 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2114 | |
2115 | community_ignore: | |
2116 | stream_forward_getp(peer->curr, length); | |
2117 | ||
e2863b4f | 2118 | return bgp_attr_ignore(peer, args->type); |
718e3744 | 2119 | } |
2120 | ||
2121 | /* Originator ID attribute. */ | |
79288e4c | 2122 | static enum bgp_attr_parse_ret |
d62a17ae | 2123 | bgp_attr_originator_id(struct bgp_attr_parser_args *args) |
718e3744 | 2124 | { |
d62a17ae | 2125 | struct peer *const peer = args->peer; |
2126 | struct attr *const attr = args->attr; | |
2127 | const bgp_size_t length = args->length; | |
718e3744 | 2128 | |
4ba5a9c5 DA |
2129 | /* if received from an internal neighbor, it SHALL be considered |
2130 | * malformed if its length is not equal to 4. If malformed, the | |
2131 | * UPDATE message SHALL be handled using the approach of "treat-as- | |
2132 | * withdraw". | |
2133 | */ | |
d62a17ae | 2134 | if (length != 4) { |
e50f7cfd | 2135 | flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d", |
1c50c1c0 | 2136 | length); |
718e3744 | 2137 | |
d62a17ae | 2138 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2139 | args->total); | |
2140 | } | |
2141 | ||
e2863b4f | 2142 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
2143 | goto originator_id_ignore; |
2144 | ||
424ab01d | 2145 | attr->originator_id.s_addr = stream_get_ipv4(peer->curr); |
718e3744 | 2146 | |
d62a17ae | 2147 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID); |
718e3744 | 2148 | |
d62a17ae | 2149 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2150 | |
2151 | originator_id_ignore: | |
2152 | stream_forward_getp(peer->curr, length); | |
2153 | ||
e2863b4f | 2154 | return bgp_attr_ignore(peer, args->type); |
718e3744 | 2155 | } |
2156 | ||
2157 | /* Cluster list attribute. */ | |
79288e4c | 2158 | static enum bgp_attr_parse_ret |
d62a17ae | 2159 | bgp_attr_cluster_list(struct bgp_attr_parser_args *args) |
718e3744 | 2160 | { |
d62a17ae | 2161 | struct peer *const peer = args->peer; |
2162 | struct attr *const attr = args->attr; | |
2163 | const bgp_size_t length = args->length; | |
2164 | ||
4ba5a9c5 DA |
2165 | /* if received from an internal neighbor, it SHALL be considered |
2166 | * malformed if its length is not a non-zero multiple of 4. If | |
2167 | * malformed, the UPDATE message SHALL be handled using the approach | |
2168 | * of "treat-as-withdraw". | |
2169 | */ | |
33ba22c2 | 2170 | if (length == 0 || length % 4) { |
1c50c1c0 | 2171 | flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length); |
718e3744 | 2172 | |
d62a17ae | 2173 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
2174 | args->total); | |
2175 | } | |
2176 | ||
e2863b4f | 2177 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
2178 | goto cluster_list_ignore; |
2179 | ||
779fee93 DS |
2180 | bgp_attr_set_cluster( |
2181 | attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr), | |
2182 | length)); | |
718e3744 | 2183 | |
d62a17ae | 2184 | /* XXX: Fix cluster_parse to use stream API and then remove this */ |
424ab01d | 2185 | stream_forward_getp(peer->curr, length); |
718e3744 | 2186 | |
d62a17ae | 2187 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST); |
718e3744 | 2188 | |
d62a17ae | 2189 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2190 | |
2191 | cluster_list_ignore: | |
2192 | stream_forward_getp(peer->curr, length); | |
2193 | ||
e2863b4f | 2194 | return bgp_attr_ignore(peer, args->type); |
718e3744 | 2195 | } |
2196 | ||
2197 | /* Multiprotocol reachability information parse. */ | |
d62a17ae | 2198 | int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
2199 | struct bgp_nlri *mp_update) | |
2200 | { | |
2201 | iana_afi_t pkt_afi; | |
2202 | afi_t afi; | |
5c525538 RW |
2203 | iana_safi_t pkt_safi; |
2204 | safi_t safi; | |
d62a17ae | 2205 | bgp_size_t nlri_len; |
2206 | size_t start; | |
2207 | struct stream *s; | |
2208 | struct peer *const peer = args->peer; | |
2209 | struct attr *const attr = args->attr; | |
2210 | const bgp_size_t length = args->length; | |
2211 | ||
2212 | /* Set end of packet. */ | |
2213 | s = BGP_INPUT(peer); | |
2214 | start = stream_get_getp(s); | |
2215 | ||
2216 | /* safe to read statically sized header? */ | |
6e4ab12f | 2217 | #define BGP_MP_REACH_MIN_SIZE 5 |
03292809 | 2218 | #define LEN_LEFT (length - (stream_get_getp(s) - start)) |
d62a17ae | 2219 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE)) { |
4cb5e18b NT |
2220 | zlog_info("%s: %s sent invalid length, %lu, of MP_REACH_NLRI", |
2221 | __func__, peer->host, (unsigned long)length); | |
d62a17ae | 2222 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2223 | } | |
2224 | ||
2225 | /* Load AFI, SAFI. */ | |
2226 | pkt_afi = stream_getw(s); | |
2227 | pkt_safi = stream_getc(s); | |
2228 | ||
2229 | /* Convert AFI, SAFI to internal values, check. */ | |
2230 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2231 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2232 | * unless | |
2233 | * the attribute is otherwise malformed. | |
2234 | */ | |
2235 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2236 | zlog_debug( | |
4cb5e18b | 2237 | "%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI", |
748a041f DS |
2238 | peer->host, iana_afi2str(pkt_afi), |
2239 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2240 | return BGP_ATTR_PARSE_ERROR; |
2241 | } | |
2242 | ||
2243 | /* Get nexthop length. */ | |
2244 | attr->mp_nexthop_len = stream_getc(s); | |
2245 | ||
2246 | if (LEN_LEFT < attr->mp_nexthop_len) { | |
2247 | zlog_info( | |
4cb5e18b | 2248 | "%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute", |
d62a17ae | 2249 | __func__, peer->host, attr->mp_nexthop_len); |
2250 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2251 | } | |
2252 | ||
2253 | /* Nexthop length check. */ | |
2254 | switch (attr->mp_nexthop_len) { | |
7c40bf39 | 2255 | case 0: |
2256 | if (safi != SAFI_FLOWSPEC) { | |
4cb5e18b | 2257 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
7c40bf39 | 2258 | __func__, peer->host, attr->mp_nexthop_len); |
2259 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2260 | } | |
2261 | break; | |
b6453163 LB |
2262 | case BGP_ATTR_NHLEN_VPNV4: |
2263 | stream_getl(s); /* RD high */ | |
2264 | stream_getl(s); /* RD low */ | |
996c9314 LB |
2265 | /* |
2266 | * NOTE: intentional fall through | |
2267 | * - for consistency in rx processing | |
2268 | * | |
2269 | * The following comment is to signal GCC this intention | |
0437e105 | 2270 | * and suppress the warning |
996c9314 LB |
2271 | */ |
2272 | /* FALLTHRU */ | |
d62a17ae | 2273 | case BGP_ATTR_NHLEN_IPV4: |
2274 | stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN); | |
2275 | /* Probably needed for RFC 2283 */ | |
975a328e | 2276 | if (attr->nexthop.s_addr == INADDR_ANY) |
d62a17ae | 2277 | memcpy(&attr->nexthop.s_addr, |
2278 | &attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN); | |
2279 | break; | |
d62a17ae | 2280 | case BGP_ATTR_NHLEN_IPV6_GLOBAL: |
2281 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL: | |
2282 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) { | |
2283 | stream_getl(s); /* RD high */ | |
2284 | stream_getl(s); /* RD low */ | |
2285 | } | |
2286 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2287 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2288 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2289 | 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 |
2290 | peer->host); |
2291 | return BGP_ATTR_PARSE_WITHDRAW; | |
2292 | } | |
77e62f2b | 2293 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2294 | } |
d62a17ae | 2295 | break; |
2296 | case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL: | |
2297 | case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL: | |
2298 | if (attr->mp_nexthop_len | |
2299 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2300 | stream_getl(s); /* RD high */ | |
2301 | stream_getl(s); /* RD low */ | |
2302 | } | |
2303 | stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN); | |
17cdd31e DS |
2304 | if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) { |
2305 | if (!peer->nexthop.ifp) { | |
4cb5e18b | 2306 | 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 |
2307 | peer->host); |
2308 | return BGP_ATTR_PARSE_WITHDRAW; | |
2309 | } | |
77e62f2b | 2310 | attr->nh_ifindex = peer->nexthop.ifp->ifindex; |
17cdd31e | 2311 | } |
d62a17ae | 2312 | if (attr->mp_nexthop_len |
2313 | == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
2314 | stream_getl(s); /* RD high */ | |
2315 | stream_getl(s); /* RD low */ | |
2316 | } | |
2317 | stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN); | |
2318 | if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) { | |
d62a17ae | 2319 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
2320 | zlog_debug( | |
c0d72166 DS |
2321 | "%s sent next-hops %pI6 and %pI6. Ignoring non-LL value", |
2322 | peer->host, &attr->mp_nexthop_global, | |
2323 | &attr->mp_nexthop_local); | |
d62a17ae | 2324 | |
2325 | attr->mp_nexthop_len = IPV6_MAX_BYTELEN; | |
2326 | } | |
17cdd31e | 2327 | if (!peer->nexthop.ifp) { |
4cb5e18b | 2328 | zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing", |
17cdd31e DS |
2329 | peer->host); |
2330 | return BGP_ATTR_PARSE_WITHDRAW; | |
2331 | } | |
77e62f2b | 2332 | attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex; |
d62a17ae | 2333 | break; |
2334 | default: | |
4cb5e18b | 2335 | zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI", |
d62a17ae | 2336 | __func__, peer->host, attr->mp_nexthop_len); |
2337 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2338 | } | |
2339 | ||
2340 | if (!LEN_LEFT) { | |
4cb5e18b NT |
2341 | zlog_info("%s: %s sent SNPA which couldn't be read", |
2342 | __func__, peer->host); | |
d62a17ae | 2343 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2344 | } | |
2345 | ||
718e3744 | 2346 | { |
d7c0a89a | 2347 | uint8_t val; |
d62a17ae | 2348 | if ((val = stream_getc(s))) |
ade6974d | 2349 | flog_warn( |
e50f7cfd | 2350 | EC_BGP_DEFUNCT_SNPA_LEN, |
ade6974d QY |
2351 | "%s sent non-zero value, %u, for defunct SNPA-length field", |
2352 | peer->host, val); | |
d62a17ae | 2353 | } |
2354 | ||
2355 | /* must have nrli_len, what is left of the attribute */ | |
2356 | nlri_len = LEN_LEFT; | |
9b9df989 | 2357 | if (nlri_len > STREAM_READABLE(s)) { |
4cb5e18b NT |
2358 | zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read", |
2359 | __func__, peer->host); | |
d62a17ae | 2360 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; |
2361 | } | |
2362 | ||
9b9df989 | 2363 | if (!nlri_len) { |
4cb5e18b | 2364 | zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker", |
9b9df989 DS |
2365 | __func__, peer->host); |
2366 | ||
2367 | mp_update->afi = afi; | |
2368 | mp_update->safi = safi; | |
2369 | return BGP_ATTR_PARSE_EOR; | |
2370 | } | |
2371 | ||
d62a17ae | 2372 | mp_update->afi = afi; |
2373 | mp_update->safi = safi; | |
2374 | mp_update->nlri = stream_pnt(s); | |
2375 | mp_update->length = nlri_len; | |
2376 | ||
2377 | stream_forward_getp(s, nlri_len); | |
2378 | ||
2379 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI); | |
2380 | ||
2381 | return BGP_ATTR_PARSE_PROCEED; | |
03292809 | 2382 | #undef LEN_LEFT |
718e3744 | 2383 | } |
2384 | ||
2385 | /* Multiprotocol unreachable parse */ | |
d62a17ae | 2386 | int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, |
2387 | struct bgp_nlri *mp_withdraw) | |
2388 | { | |
2389 | struct stream *s; | |
2390 | iana_afi_t pkt_afi; | |
2391 | afi_t afi; | |
5c525538 RW |
2392 | iana_safi_t pkt_safi; |
2393 | safi_t safi; | |
d7c0a89a | 2394 | uint16_t withdraw_len; |
d62a17ae | 2395 | struct peer *const peer = args->peer; |
2396 | struct attr *const attr = args->attr; | |
2397 | const bgp_size_t length = args->length; | |
9cabb64b | 2398 | |
424ab01d | 2399 | s = peer->curr; |
9cabb64b | 2400 | |
d62a17ae | 2401 | #define BGP_MP_UNREACH_MIN_SIZE 3 |
2402 | if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE)) | |
2403 | return BGP_ATTR_PARSE_ERROR_NOTIFYPLS; | |
2404 | ||
2405 | pkt_afi = stream_getw(s); | |
2406 | pkt_safi = stream_getc(s); | |
2407 | ||
2408 | /* Convert AFI, SAFI to internal values, check. */ | |
2409 | if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) { | |
2410 | /* Log if AFI or SAFI is unrecognized. This is not an error | |
2411 | * unless | |
2412 | * the attribute is otherwise malformed. | |
2413 | */ | |
2414 | if (bgp_debug_update(peer, NULL, NULL, 0)) | |
2415 | zlog_debug( | |
748a041f DS |
2416 | "%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized", |
2417 | peer->host, iana_afi2str(pkt_afi), | |
2418 | iana_safi2str(pkt_safi)); | |
d62a17ae | 2419 | return BGP_ATTR_PARSE_ERROR; |
2420 | } | |
718e3744 | 2421 | |
d62a17ae | 2422 | withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE; |
718e3744 | 2423 | |
d62a17ae | 2424 | mp_withdraw->afi = afi; |
2425 | mp_withdraw->safi = safi; | |
2426 | mp_withdraw->nlri = stream_pnt(s); | |
2427 | mp_withdraw->length = withdraw_len; | |
718e3744 | 2428 | |
d62a17ae | 2429 | stream_forward_getp(s, withdraw_len); |
37da8fa9 | 2430 | |
d62a17ae | 2431 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI); |
2432 | ||
2433 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 2434 | } |
2435 | ||
57d187bc | 2436 | /* Large Community attribute. */ |
79288e4c | 2437 | static enum bgp_attr_parse_ret |
d62a17ae | 2438 | bgp_attr_large_community(struct bgp_attr_parser_args *args) |
2439 | { | |
2440 | struct peer *const peer = args->peer; | |
2441 | struct attr *const attr = args->attr; | |
2442 | const bgp_size_t length = args->length; | |
2443 | ||
2444 | /* | |
2445 | * Large community follows new attribute format. | |
2446 | */ | |
2447 | if (length == 0) { | |
1bcf3a96 | 2448 | bgp_attr_set_lcommunity(attr, NULL); |
d62a17ae | 2449 | /* Empty extcomm doesn't seem to be invalid per se */ |
6680b550 DA |
2450 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2451 | args->total); | |
d62a17ae | 2452 | } |
57d187bc | 2453 | |
e2863b4f | 2454 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
2455 | goto large_community_ignore; |
2456 | ||
1bcf3a96 DA |
2457 | bgp_attr_set_lcommunity( |
2458 | attr, lcommunity_parse(stream_pnt(peer->curr), length)); | |
d62a17ae | 2459 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2460 | stream_forward_getp(peer->curr, length); |
57d187bc | 2461 | |
1bcf3a96 | 2462 | if (!bgp_attr_get_lcommunity(attr)) |
d62a17ae | 2463 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2464 | args->total); | |
57d187bc | 2465 | |
d62a17ae | 2466 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2467 | |
2468 | large_community_ignore: | |
2469 | stream_forward_getp(peer->curr, length); | |
2470 | ||
e2863b4f | 2471 | return bgp_attr_ignore(peer, args->type); |
57d187bc JS |
2472 | } |
2473 | ||
718e3744 | 2474 | /* Extended Community attribute. */ |
79288e4c | 2475 | static enum bgp_attr_parse_ret |
d62a17ae | 2476 | bgp_attr_ext_communities(struct bgp_attr_parser_args *args) |
2477 | { | |
2478 | struct peer *const peer = args->peer; | |
2479 | struct attr *const attr = args->attr; | |
2480 | const bgp_size_t length = args->length; | |
d7c0a89a | 2481 | uint8_t sticky = 0; |
7904e9fd | 2482 | bool proxy = false; |
b53e67a3 | 2483 | struct ecommunity *ecomm; |
d62a17ae | 2484 | |
2485 | if (length == 0) { | |
b53e67a3 | 2486 | bgp_attr_set_ecommunity(attr, NULL); |
d62a17ae | 2487 | /* Empty extcomm doesn't seem to be invalid per se */ |
6680b550 DA |
2488 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2489 | args->total); | |
d62a17ae | 2490 | } |
2491 | ||
b53e67a3 | 2492 | ecomm = ecommunity_parse( |
27aa23a4 DA |
2493 | stream_pnt(peer->curr), length, |
2494 | CHECK_FLAG(peer->flags, | |
2495 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
b53e67a3 | 2496 | bgp_attr_set_ecommunity(attr, ecomm); |
d62a17ae | 2497 | /* XXX: fix ecommunity_parse to use stream API */ |
424ab01d | 2498 | stream_forward_getp(peer->curr, length); |
d62a17ae | 2499 | |
4ba5a9c5 DA |
2500 | /* The Extended Community attribute SHALL be considered malformed if |
2501 | * its length is not a non-zero multiple of 8. | |
2502 | */ | |
b53e67a3 | 2503 | if (!bgp_attr_get_ecommunity(attr)) |
d62a17ae | 2504 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2505 | args->total); | |
2506 | ||
74e2bd89 AK |
2507 | /* Extract DF election preference and mobility sequence number */ |
2508 | attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg); | |
2509 | ||
d62a17ae | 2510 | /* Extract MAC mobility sequence number, if any. */ |
2511 | attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky); | |
2512 | attr->sticky = sticky; | |
2513 | ||
ead40654 MK |
2514 | /* Check if this is a Gateway MAC-IP advertisement */ |
2515 | attr->default_gw = bgp_attr_default_gw(attr); | |
2516 | ||
68e33151 CS |
2517 | /* Handle scenario where router flag ecommunity is not |
2518 | * set but default gw ext community is present. | |
2519 | * Use default gateway, set and propogate R-bit. | |
2520 | */ | |
2521 | if (attr->default_gw) | |
2522 | attr->router_flag = 1; | |
2523 | ||
2524 | /* Check EVPN Neighbor advertisement flags, R-bit */ | |
7904e9fd AK |
2525 | bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy); |
2526 | if (proxy) | |
2527 | attr->es_flags |= ATTR_ES_PROXY_ADVERT; | |
68e33151 | 2528 | |
bc59a672 | 2529 | /* Extract the Rmac, if any */ |
eee353c5 | 2530 | if (bgp_attr_rmac(attr, &attr->rmac)) { |
c0d72166 DS |
2531 | if (bgp_debug_update(peer, NULL, NULL, 1) |
2532 | && bgp_mac_exist(&attr->rmac)) | |
2533 | zlog_debug("%s: router mac %pEA is self mac", __func__, | |
2534 | &attr->rmac); | |
eee353c5 | 2535 | } |
bc59a672 | 2536 | |
f4bd90c5 LK |
2537 | /* Get the tunnel type from encap extended community */ |
2538 | bgp_attr_extcom_tunnel_type(attr, | |
2539 | (bgp_encap_types *)&attr->encap_tunneltype); | |
2540 | ||
d901dc13 | 2541 | /* Extract link bandwidth, if any. */ |
b53e67a3 DA |
2542 | (void)ecommunity_linkbw_present(bgp_attr_get_ecommunity(attr), |
2543 | &attr->link_bw); | |
d901dc13 | 2544 | |
d62a17ae | 2545 | return BGP_ATTR_PARSE_PROCEED; |
718e3744 | 2546 | } |
2547 | ||
9a659715 | 2548 | /* IPv6 Extended Community attribute. */ |
79288e4c | 2549 | static enum bgp_attr_parse_ret |
9a659715 PG |
2550 | bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) |
2551 | { | |
2552 | struct peer *const peer = args->peer; | |
2553 | struct attr *const attr = args->attr; | |
2554 | const bgp_size_t length = args->length; | |
d04ac434 | 2555 | struct ecommunity *ipv6_ecomm = NULL; |
9a659715 PG |
2556 | |
2557 | if (length == 0) { | |
d04ac434 | 2558 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
c6423c31 PG |
2559 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2560 | args->total); | |
9a659715 PG |
2561 | } |
2562 | ||
e2863b4f | 2563 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
2564 | goto ipv6_ext_community_ignore; |
2565 | ||
27aa23a4 DA |
2566 | ipv6_ecomm = ecommunity_parse_ipv6( |
2567 | stream_pnt(peer->curr), length, | |
2568 | CHECK_FLAG(peer->flags, | |
2569 | PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE)); | |
d04ac434 DS |
2570 | bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm); |
2571 | ||
9a659715 PG |
2572 | /* XXX: fix ecommunity_parse to use stream API */ |
2573 | stream_forward_getp(peer->curr, length); | |
2574 | ||
d04ac434 | 2575 | if (!ipv6_ecomm) |
9a659715 PG |
2576 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2577 | args->total); | |
2578 | ||
9a659715 | 2579 | return BGP_ATTR_PARSE_PROCEED; |
a5c6a9b1 DA |
2580 | |
2581 | ipv6_ext_community_ignore: | |
2582 | stream_forward_getp(peer->curr, length); | |
2583 | ||
e2863b4f | 2584 | return bgp_attr_ignore(peer, args->type); |
9a659715 PG |
2585 | } |
2586 | ||
f4c89855 | 2587 | /* Parse Tunnel Encap attribute in an UPDATE */ |
d62a17ae | 2588 | static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ |
2589 | bgp_size_t length, /* IN: attr's length field */ | |
2590 | struct attr *attr, /* IN: caller already allocated */ | |
d7c0a89a QY |
2591 | uint8_t flag, /* IN: attr's flags field */ |
2592 | uint8_t *startp) | |
d62a17ae | 2593 | { |
2594 | bgp_size_t total; | |
d62a17ae | 2595 | uint16_t tunneltype = 0; |
2596 | ||
2597 | total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); | |
2598 | ||
2599 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) | |
2600 | || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
2601 | zlog_info( | |
2602 | "Tunnel Encap attribute flag isn't optional and transitive %d", | |
2603 | flag); | |
2604 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2605 | BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
2606 | startp, total); | |
2607 | return -1; | |
2608 | } | |
2609 | ||
2610 | if (BGP_ATTR_ENCAP == type) { | |
2611 | /* read outer TLV type and length */ | |
2612 | uint16_t tlv_length; | |
2613 | ||
2614 | if (length < 4) { | |
2615 | zlog_info( | |
2616 | "Tunnel Encap attribute not long enough to contain outer T,L"); | |
2617 | bgp_notify_send_with_data( | |
2618 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2619 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2620 | return -1; | |
2621 | } | |
2622 | tunneltype = stream_getw(BGP_INPUT(peer)); | |
2623 | tlv_length = stream_getw(BGP_INPUT(peer)); | |
2624 | length -= 4; | |
2625 | ||
2626 | if (tlv_length != length) { | |
4cb5e18b NT |
2627 | zlog_info("%s: tlv_length(%d) != length(%d)", |
2628 | __func__, tlv_length, length); | |
d62a17ae | 2629 | } |
2630 | } | |
2631 | ||
2632 | while (length >= 4) { | |
2633 | uint16_t subtype = 0; | |
2634 | uint16_t sublength = 0; | |
2635 | struct bgp_attr_encap_subtlv *tlv; | |
2636 | ||
2637 | if (BGP_ATTR_ENCAP == type) { | |
2638 | subtype = stream_getc(BGP_INPUT(peer)); | |
2639 | sublength = stream_getc(BGP_INPUT(peer)); | |
2640 | length -= 2; | |
1e20238a | 2641 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2642 | } else { |
2643 | subtype = stream_getw(BGP_INPUT(peer)); | |
2644 | sublength = stream_getw(BGP_INPUT(peer)); | |
2645 | length -= 4; | |
65efcfce | 2646 | #endif |
d62a17ae | 2647 | } |
2648 | ||
2649 | if (sublength > length) { | |
2650 | zlog_info( | |
2651 | "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", | |
2652 | sublength, length); | |
2653 | bgp_notify_send_with_data( | |
2654 | peer, BGP_NOTIFY_UPDATE_ERR, | |
2655 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); | |
2656 | return -1; | |
2657 | } | |
2658 | ||
2659 | /* alloc and copy sub-tlv */ | |
2660 | /* TBD make sure these are freed when attributes are released */ | |
2661 | tlv = XCALLOC(MTYPE_ENCAP_TLV, | |
996c9314 | 2662 | sizeof(struct bgp_attr_encap_subtlv) + sublength); |
d62a17ae | 2663 | tlv->type = subtype; |
2664 | tlv->length = sublength; | |
424ab01d | 2665 | stream_get(tlv->value, peer->curr, sublength); |
d62a17ae | 2666 | length -= sublength; |
2667 | ||
2668 | /* attach tlv to encap chain */ | |
2669 | if (BGP_ATTR_ENCAP == type) { | |
e4002056 | 2670 | struct bgp_attr_encap_subtlv *stlv_last; |
d62a17ae | 2671 | for (stlv_last = attr->encap_subtlvs; |
2672 | stlv_last && stlv_last->next; | |
2673 | stlv_last = stlv_last->next) | |
2674 | ; | |
2675 | if (stlv_last) { | |
2676 | stlv_last->next = tlv; | |
2677 | } else { | |
2678 | attr->encap_subtlvs = tlv; | |
2679 | } | |
1e20238a | 2680 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 2681 | } else { |
e4002056 | 2682 | struct bgp_attr_encap_subtlv *stlv_last; |
91ebf12c DS |
2683 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
2684 | bgp_attr_get_vnc_subtlvs(attr); | |
2685 | ||
2686 | for (stlv_last = vnc_subtlvs; | |
d62a17ae | 2687 | stlv_last && stlv_last->next; |
2688 | stlv_last = stlv_last->next) | |
2689 | ; | |
91ebf12c | 2690 | if (stlv_last) |
d62a17ae | 2691 | stlv_last->next = tlv; |
91ebf12c DS |
2692 | else |
2693 | bgp_attr_set_vnc_subtlvs(attr, tlv); | |
aadc0905 | 2694 | #endif |
d62a17ae | 2695 | } |
d62a17ae | 2696 | } |
f4c89855 | 2697 | |
d62a17ae | 2698 | if (BGP_ATTR_ENCAP == type) { |
2699 | attr->encap_tunneltype = tunneltype; | |
2700 | } | |
f4c89855 | 2701 | |
d62a17ae | 2702 | if (length) { |
2703 | /* spurious leftover data */ | |
2704 | zlog_info( | |
2705 | "Tunnel Encap attribute length is bad: %d leftover octets", | |
2706 | length); | |
2707 | bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, | |
2708 | BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, | |
2709 | startp, total); | |
2710 | return -1; | |
2711 | } | |
f4c89855 | 2712 | |
d62a17ae | 2713 | return 0; |
f4c89855 LB |
2714 | } |
2715 | ||
73604f82 RS |
2716 | |
2717 | /* SRv6 Service Data Sub-Sub-TLV attribute | |
2718 | * draft-ietf-bess-srv6-services-07 | |
2719 | */ | |
79288e4c | 2720 | static enum bgp_attr_parse_ret |
73604f82 RS |
2721 | bgp_attr_srv6_service_data(struct bgp_attr_parser_args *args) |
2722 | { | |
2723 | struct peer *const peer = args->peer; | |
9299fd00 | 2724 | struct attr *const attr = args->attr; |
73604f82 RS |
2725 | uint8_t type, loc_block_len, loc_node_len, func_len, arg_len, |
2726 | transposition_len, transposition_offset; | |
2727 | uint16_t length; | |
2728 | size_t headersz = sizeof(type) + sizeof(length); | |
2729 | ||
2730 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2731 | flog_err( | |
2732 | EC_BGP_ATTR_LEN, | |
2733 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2734 | headersz, STREAM_READABLE(peer->curr)); | |
2735 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2736 | args->total); | |
2737 | } | |
2738 | ||
2739 | type = stream_getc(peer->curr); | |
2740 | length = stream_getw(peer->curr); | |
2741 | ||
2742 | if (STREAM_READABLE(peer->curr) < length) { | |
2743 | flog_err( | |
2744 | EC_BGP_ATTR_LEN, | |
2745 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2746 | length, STREAM_READABLE(peer->curr)); | |
2747 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2748 | args->total); | |
2749 | } | |
2750 | ||
5c111a25 DS |
2751 | if (length < BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH) { |
2752 | flog_err( | |
2753 | EC_BGP_ATTR_LEN, | |
c5fa4459 | 2754 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficient data (need %u, have %hu remaining in UPDATE)", |
5c111a25 DS |
2755 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH, |
2756 | length); | |
2757 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2758 | args->total); | |
2759 | } | |
2760 | ||
73604f82 | 2761 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE) { |
bc32d950 DS |
2762 | if (STREAM_READABLE(peer->curr) < |
2763 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH) { | |
2764 | flog_err( | |
2765 | EC_BGP_ATTR_LEN, | |
2766 | "Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficient data (need %u, have %zu remaining in UPDATE)", | |
2767 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH, | |
2768 | STREAM_READABLE(peer->curr)); | |
2769 | return bgp_attr_malformed( | |
2770 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2771 | args->total); | |
2772 | } | |
2773 | ||
73604f82 RS |
2774 | loc_block_len = stream_getc(peer->curr); |
2775 | loc_node_len = stream_getc(peer->curr); | |
2776 | func_len = stream_getc(peer->curr); | |
2777 | arg_len = stream_getc(peer->curr); | |
2778 | transposition_len = stream_getc(peer->curr); | |
2779 | transposition_offset = stream_getc(peer->curr); | |
2780 | ||
2781 | /* Log SRv6 Service Data Sub-Sub-TLV */ | |
2782 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) { | |
2783 | zlog_debug( | |
2784 | "%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", | |
2785 | __func__, loc_block_len, loc_node_len, func_len, | |
2786 | arg_len, transposition_len, | |
2787 | transposition_offset); | |
2788 | } | |
9299fd00 RS |
2789 | |
2790 | attr->srv6_l3vpn->loc_block_len = loc_block_len; | |
2791 | attr->srv6_l3vpn->loc_node_len = loc_node_len; | |
2792 | attr->srv6_l3vpn->func_len = func_len; | |
2793 | attr->srv6_l3vpn->arg_len = arg_len; | |
2794 | attr->srv6_l3vpn->transposition_len = transposition_len; | |
2795 | attr->srv6_l3vpn->transposition_offset = transposition_offset; | |
73604f82 RS |
2796 | } |
2797 | ||
2798 | else { | |
2799 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2800 | zlog_debug( | |
2801 | "%s attr SRv6 Service Data Sub-Sub-TLV sub-sub-type=%u is not supported, skipped", | |
2802 | peer->host, type); | |
2803 | ||
2804 | stream_forward_getp(peer->curr, length); | |
2805 | } | |
2806 | ||
2807 | return BGP_ATTR_PARSE_PROCEED; | |
2808 | } | |
2809 | ||
2810 | /* SRv6 Service Sub-TLV attribute | |
2811 | * draft-ietf-bess-srv6-services-07 | |
2812 | */ | |
79288e4c | 2813 | static enum bgp_attr_parse_ret |
73604f82 RS |
2814 | bgp_attr_srv6_service(struct bgp_attr_parser_args *args) |
2815 | { | |
2816 | struct peer *const peer = args->peer; | |
2817 | struct attr *const attr = args->attr; | |
2818 | struct in6_addr ipv6_sid; | |
2819 | uint8_t type, sid_flags; | |
2820 | uint16_t length, endpoint_behavior; | |
2821 | size_t headersz = sizeof(type) + sizeof(length); | |
79288e4c | 2822 | enum bgp_attr_parse_ret err; |
73604f82 RS |
2823 | |
2824 | if (STREAM_READABLE(peer->curr) < headersz) { | |
2825 | flog_err( | |
2826 | EC_BGP_ATTR_LEN, | |
2827 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
2828 | headersz, STREAM_READABLE(peer->curr)); | |
2829 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2830 | args->total); | |
2831 | } | |
2832 | ||
2833 | type = stream_getc(peer->curr); | |
2834 | length = stream_getw(peer->curr); | |
2835 | ||
2836 | if (STREAM_READABLE(peer->curr) < length) { | |
2837 | flog_err( | |
2838 | EC_BGP_ATTR_LEN, | |
2839 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)", | |
2840 | length, STREAM_READABLE(peer->curr)); | |
2841 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2842 | args->total); | |
2843 | } | |
2844 | ||
2845 | if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO) { | |
bc32d950 DS |
2846 | if (STREAM_READABLE(peer->curr) < |
2847 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { | |
2848 | flog_err( | |
2849 | EC_BGP_ATTR_LEN, | |
2850 | "Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %d for attribute data, have %zu remaining in UPDATE)", | |
2851 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH, | |
2852 | STREAM_READABLE(peer->curr)); | |
2853 | return bgp_attr_malformed( | |
2854 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2855 | args->total); | |
2856 | } | |
73604f82 RS |
2857 | stream_getc(peer->curr); |
2858 | stream_get(&ipv6_sid, peer->curr, sizeof(ipv6_sid)); | |
2859 | sid_flags = stream_getc(peer->curr); | |
2860 | endpoint_behavior = stream_getw(peer->curr); | |
2861 | stream_getc(peer->curr); | |
2862 | ||
2863 | /* Log SRv6 Service Sub-TLV */ | |
07380148 | 2864 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) |
73604f82 | 2865 | zlog_debug( |
07380148 DA |
2866 | "%s: srv6-l3-srv sid %pI6, sid-flags 0x%02x, end-behaviour 0x%04x", |
2867 | __func__, &ipv6_sid, sid_flags, | |
2868 | endpoint_behavior); | |
73604f82 RS |
2869 | |
2870 | /* Configure from Info */ | |
2871 | if (attr->srv6_l3vpn) { | |
2872 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
2873 | "Prefix SID SRv6 L3VPN field repeated"); | |
2874 | return bgp_attr_malformed( | |
2875 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
2876 | } | |
2877 | attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN, | |
2878 | sizeof(struct bgp_attr_srv6_l3vpn)); | |
9299fd00 | 2879 | sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid); |
73604f82 RS |
2880 | attr->srv6_l3vpn->sid_flags = sid_flags; |
2881 | attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior; | |
9299fd00 RS |
2882 | attr->srv6_l3vpn->loc_block_len = 0; |
2883 | attr->srv6_l3vpn->loc_node_len = 0; | |
2884 | attr->srv6_l3vpn->func_len = 0; | |
2885 | attr->srv6_l3vpn->arg_len = 0; | |
2886 | attr->srv6_l3vpn->transposition_len = 0; | |
2887 | attr->srv6_l3vpn->transposition_offset = 0; | |
73604f82 RS |
2888 | |
2889 | // Sub-Sub-TLV found | |
9299fd00 RS |
2890 | if (length > BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) { |
2891 | err = bgp_attr_srv6_service_data(args); | |
2892 | ||
2893 | if (err != BGP_ATTR_PARSE_PROCEED) | |
2894 | return err; | |
2895 | } | |
2896 | ||
2897 | attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn); | |
73604f82 RS |
2898 | } |
2899 | ||
2900 | /* Placeholder code for unsupported type */ | |
2901 | else { | |
2902 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
2903 | zlog_debug( | |
2904 | "%s attr SRv6 Service Sub-TLV sub-type=%u is not supported, skipped", | |
2905 | peer->host, type); | |
2906 | ||
2907 | stream_forward_getp(peer->curr, length); | |
2908 | } | |
2909 | ||
2910 | return BGP_ATTR_PARSE_PROCEED; | |
2911 | } | |
2912 | ||
30adbd4e DS |
2913 | /* |
2914 | * Read an individual SID value returning how much data we have read | |
2915 | * Returns 0 if there was an error that needs to be passed up the stack | |
c5a543b4 | 2916 | */ |
79288e4c DA |
2917 | static enum bgp_attr_parse_ret |
2918 | bgp_attr_psid_sub(uint8_t type, uint16_t length, | |
2919 | struct bgp_attr_parser_args *args) | |
d62a17ae | 2920 | { |
2921 | struct peer *const peer = args->peer; | |
2922 | struct attr *const attr = args->attr; | |
d7c0a89a | 2923 | uint32_t label_index; |
d62a17ae | 2924 | struct in6_addr ipv6_sid; |
d7c0a89a QY |
2925 | uint32_t srgb_base; |
2926 | uint32_t srgb_range; | |
d62a17ae | 2927 | int srgb_count; |
e496b420 | 2928 | uint8_t sid_type, sid_flags; |
d62a17ae | 2929 | |
d62a17ae | 2930 | if (type == BGP_PREFIX_SID_LABEL_INDEX) { |
f69aeb76 QY |
2931 | if (STREAM_READABLE(peer->curr) < length |
2932 | || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) { | |
2933 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 2934 | "Prefix SID label index length is %hu instead of %u", |
f69aeb76 | 2935 | length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); |
30adbd4e DS |
2936 | return bgp_attr_malformed(args, |
2937 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2938 | args->total); | |
d62a17ae | 2939 | } |
2940 | ||
2941 | /* Ignore flags and reserved */ | |
424ab01d QY |
2942 | stream_getc(peer->curr); |
2943 | stream_getw(peer->curr); | |
d62a17ae | 2944 | |
2945 | /* Fetch the label index and see if it is valid. */ | |
424ab01d | 2946 | label_index = stream_getl(peer->curr); |
d62a17ae | 2947 | if (label_index == BGP_INVALID_LABEL_INDEX) |
30adbd4e DS |
2948 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
2949 | args->total); | |
d62a17ae | 2950 | |
2951 | /* Store label index; subsequently, we'll check on | |
2952 | * address-family */ | |
2953 | attr->label_index = label_index; | |
d62a17ae | 2954 | } |
2955 | ||
2956 | /* Placeholder code for the IPv6 SID type */ | |
2957 | else if (type == BGP_PREFIX_SID_IPV6) { | |
f69aeb76 QY |
2958 | if (STREAM_READABLE(peer->curr) < length |
2959 | || length != BGP_PREFIX_SID_IPV6_LENGTH) { | |
e50f7cfd | 2960 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 2961 | "Prefix SID IPv6 length is %hu instead of %u", |
1c50c1c0 | 2962 | length, BGP_PREFIX_SID_IPV6_LENGTH); |
30adbd4e DS |
2963 | return bgp_attr_malformed(args, |
2964 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2965 | args->total); | |
d62a17ae | 2966 | } |
2967 | ||
2968 | /* Ignore reserved */ | |
424ab01d QY |
2969 | stream_getc(peer->curr); |
2970 | stream_getw(peer->curr); | |
d62a17ae | 2971 | |
424ab01d | 2972 | stream_get(&ipv6_sid, peer->curr, 16); |
d62a17ae | 2973 | } |
2974 | ||
2975 | /* Placeholder code for the Originator SRGB type */ | |
2976 | else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) { | |
473046ee QY |
2977 | /* |
2978 | * ietf-idr-bgp-prefix-sid-05: | |
2979 | * Length is the total length of the value portion of the | |
2980 | * TLV: 2 + multiple of 6. | |
2981 | * | |
2982 | * peer->curr stream readp should be at the beginning of the 16 | |
2983 | * bit flag field at this point in the code. | |
2984 | */ | |
d62a17ae | 2985 | |
473046ee QY |
2986 | /* |
2987 | * Check that the TLV length field is sane: at least 2 bytes of | |
2988 | * flag, and at least 1 SRGB (these are 6 bytes each) | |
2989 | */ | |
2990 | if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) { | |
2991 | flog_err( | |
2992 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 2993 | "Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u", |
473046ee QY |
2994 | length, |
2995 | 2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); | |
2996 | return bgp_attr_malformed( | |
2997 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
2998 | args->total); | |
2999 | } | |
d62a17ae | 3000 | |
473046ee QY |
3001 | /* |
3002 | * Check that we actually have at least as much data as | |
3003 | * specified by the length field | |
3004 | */ | |
3005 | if (STREAM_READABLE(peer->curr) < length) { | |
f69aeb76 | 3006 | flog_err(EC_BGP_ATTR_LEN, |
6cde4b45 | 3007 | "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain", |
473046ee | 3008 | length, STREAM_READABLE(peer->curr)); |
f69aeb76 QY |
3009 | return bgp_attr_malformed( |
3010 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3011 | args->total); | |
3012 | } | |
3013 | ||
473046ee QY |
3014 | /* |
3015 | * Check that the portion of the TLV containing the sequence of | |
3016 | * SRGBs corresponds to a multiple of the SRGB size; to get | |
3017 | * that length, we skip the 16 bit flags field | |
3018 | */ | |
424ab01d | 3019 | stream_getw(peer->curr); |
d62a17ae | 3020 | length -= 2; |
d62a17ae | 3021 | if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) { |
af4c2728 | 3022 | flog_err( |
e50f7cfd | 3023 | EC_BGP_ATTR_LEN, |
6cde4b45 | 3024 | "Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u", |
d62a17ae | 3025 | length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH); |
3026 | return bgp_attr_malformed( | |
3027 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3028 | args->total); | |
3029 | } | |
3030 | ||
3031 | srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH; | |
3032 | ||
3033 | for (int i = 0; i < srgb_count; i++) { | |
424ab01d QY |
3034 | stream_get(&srgb_base, peer->curr, 3); |
3035 | stream_get(&srgb_range, peer->curr, 3); | |
d62a17ae | 3036 | } |
3037 | } | |
3038 | ||
e496b420 HS |
3039 | /* Placeholder code for the VPN-SID Service type */ |
3040 | else if (type == BGP_PREFIX_SID_VPN_SID) { | |
3041 | if (STREAM_READABLE(peer->curr) < length | |
3042 | || length != BGP_PREFIX_SID_VPN_SID_LENGTH) { | |
3043 | flog_err(EC_BGP_ATTR_LEN, | |
6cde4b45 | 3044 | "Prefix SID VPN SID length is %hu instead of %u", |
e496b420 HS |
3045 | length, BGP_PREFIX_SID_VPN_SID_LENGTH); |
3046 | return bgp_attr_malformed(args, | |
3047 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3048 | args->total); | |
3049 | } | |
3050 | ||
3051 | /* Parse VPN-SID Sub-TLV */ | |
3052 | stream_getc(peer->curr); /* reserved */ | |
3053 | sid_type = stream_getc(peer->curr); /* sid_type */ | |
3054 | sid_flags = stream_getc(peer->curr); /* sid_flags */ | |
3055 | stream_get(&ipv6_sid, peer->curr, | |
3056 | sizeof(ipv6_sid)); /* sid_value */ | |
3057 | ||
3058 | /* Log VPN-SID Sub-TLV */ | |
07380148 | 3059 | if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) |
e496b420 | 3060 | zlog_debug( |
07380148 DA |
3061 | "%s: vpn-sid: sid %pI6, sid-type 0x%02x sid-flags 0x%02x", |
3062 | __func__, &ipv6_sid, sid_type, sid_flags); | |
e496b420 HS |
3063 | |
3064 | /* Configure from Info */ | |
b502ca11 QY |
3065 | if (attr->srv6_vpn) { |
3066 | flog_err(EC_BGP_ATTRIBUTE_REPEATED, | |
3067 | "Prefix SID SRv6 VPN field repeated"); | |
3068 | return bgp_attr_malformed( | |
3069 | args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total); | |
3070 | } | |
340594a9 | 3071 | attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN, |
e496b420 | 3072 | sizeof(struct bgp_attr_srv6_vpn)); |
e496b420 HS |
3073 | attr->srv6_vpn->sid_flags = sid_flags; |
3074 | sid_copy(&attr->srv6_vpn->sid, &ipv6_sid); | |
b83127e1 | 3075 | attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn); |
e496b420 HS |
3076 | } |
3077 | ||
3078 | /* Placeholder code for the SRv6 L3 Service type */ | |
3079 | else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) { | |
73604f82 RS |
3080 | if (STREAM_READABLE(peer->curr) < length) { |
3081 | flog_err( | |
3082 | EC_BGP_ATTR_LEN, | |
3083 | "Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain", | |
3084 | length, STREAM_READABLE(peer->curr)); | |
e496b420 HS |
3085 | return bgp_attr_malformed(args, |
3086 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3087 | args->total); | |
3088 | } | |
3089 | ||
73604f82 RS |
3090 | /* ignore reserved */ |
3091 | stream_getc(peer->curr); | |
e496b420 | 3092 | |
73604f82 | 3093 | return bgp_attr_srv6_service(args); |
e496b420 HS |
3094 | } |
3095 | ||
3096 | /* Placeholder code for Unsupported TLV */ | |
3097 | else { | |
f69aeb76 QY |
3098 | |
3099 | if (STREAM_READABLE(peer->curr) < length) { | |
3100 | flog_err( | |
3101 | EC_BGP_ATTR_LEN, | |
6cde4b45 | 3102 | "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE", |
f69aeb76 QY |
3103 | length, STREAM_READABLE(peer->curr)); |
3104 | return bgp_attr_malformed( | |
3105 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3106 | args->total); | |
3107 | } | |
3108 | ||
c6ca155d HS |
3109 | if (bgp_debug_update(peer, NULL, NULL, 1)) |
3110 | zlog_debug( | |
3111 | "%s attr Prefix-SID sub-type=%u is not supported, skipped", | |
3112 | peer->host, type); | |
f69aeb76 QY |
3113 | |
3114 | stream_forward_getp(peer->curr, length); | |
c6ca155d HS |
3115 | } |
3116 | ||
d62a17ae | 3117 | return BGP_ATTR_PARSE_PROCEED; |
6cf48acc VV |
3118 | } |
3119 | ||
30adbd4e DS |
3120 | /* Prefix SID attribute |
3121 | * draft-ietf-idr-bgp-prefix-sid-05 | |
3122 | */ | |
79288e4c | 3123 | enum bgp_attr_parse_ret bgp_attr_prefix_sid(struct bgp_attr_parser_args *args) |
30adbd4e DS |
3124 | { |
3125 | struct peer *const peer = args->peer; | |
3126 | struct attr *const attr = args->attr; | |
79288e4c | 3127 | enum bgp_attr_parse_ret ret; |
30adbd4e DS |
3128 | |
3129 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID); | |
3130 | ||
f69aeb76 QY |
3131 | uint8_t type; |
3132 | uint16_t length; | |
3133 | size_t headersz = sizeof(type) + sizeof(length); | |
38774fc5 | 3134 | size_t psid_parsed_length = 0; |
30adbd4e | 3135 | |
38774fc5 HS |
3136 | while (STREAM_READABLE(peer->curr) > 0 |
3137 | && psid_parsed_length < args->length) { | |
30adbd4e | 3138 | |
f69aeb76 QY |
3139 | if (STREAM_READABLE(peer->curr) < headersz) { |
3140 | flog_err( | |
3141 | EC_BGP_ATTR_LEN, | |
3142 | "Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)", | |
3143 | headersz, STREAM_READABLE(peer->curr)); | |
3144 | return bgp_attr_malformed( | |
3145 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3146 | args->total); | |
3147 | } | |
30adbd4e | 3148 | |
f69aeb76 QY |
3149 | type = stream_getc(peer->curr); |
3150 | length = stream_getw(peer->curr); | |
30adbd4e | 3151 | |
f69aeb76 | 3152 | if (STREAM_READABLE(peer->curr) < length) { |
af4c2728 | 3153 | flog_err( |
e50f7cfd | 3154 | EC_BGP_ATTR_LEN, |
6cde4b45 | 3155 | "Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)", |
f69aeb76 | 3156 | length, STREAM_READABLE(peer->curr)); |
30adbd4e DS |
3157 | return bgp_attr_malformed(args, |
3158 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3159 | args->total); | |
3160 | } | |
f69aeb76 | 3161 | |
45a06b11 | 3162 | ret = bgp_attr_psid_sub(type, length, args); |
f69aeb76 QY |
3163 | |
3164 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
3165 | return ret; | |
38774fc5 HS |
3166 | |
3167 | psid_parsed_length += length + headersz; | |
3168 | ||
3169 | if (psid_parsed_length > args->length) { | |
3170 | flog_err( | |
3171 | EC_BGP_ATTR_LEN, | |
3efd0893 | 3172 | "Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)", |
38774fc5 HS |
3173 | length + headersz, psid_parsed_length - (length + headersz)); |
3174 | return bgp_attr_malformed( | |
3175 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3176 | args->total); | |
3177 | } | |
30adbd4e DS |
3178 | } |
3179 | ||
3180 | return BGP_ATTR_PARSE_PROCEED; | |
3181 | } | |
3182 | ||
7fd077aa | 3183 | /* PMSI tunnel attribute (RFC 6514) |
3184 | * Basic validation checks done here. | |
3185 | */ | |
79288e4c | 3186 | static enum bgp_attr_parse_ret |
7fd077aa | 3187 | bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args) |
3188 | { | |
3189 | struct peer *const peer = args->peer; | |
3190 | struct attr *const attr = args->attr; | |
3191 | const bgp_size_t length = args->length; | |
d7c0a89a | 3192 | uint8_t tnl_type; |
355f3c11 | 3193 | int attr_parse_len = 2 + BGP_LABEL_BYTES; |
7fd077aa | 3194 | |
3195 | /* Verify that the receiver is expecting "ingress replication" as we | |
3196 | * can only support that. | |
3197 | */ | |
355f3c11 | 3198 | if (length < attr_parse_len) { |
1c50c1c0 QY |
3199 | flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d", |
3200 | length); | |
7fd077aa | 3201 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, |
3202 | args->total); | |
3203 | } | |
3204 | stream_getc(peer->curr); /* Flags */ | |
3205 | tnl_type = stream_getc(peer->curr); | |
3206 | if (tnl_type > PMSI_TNLTYPE_MAX) { | |
e50f7cfd | 3207 | flog_err(EC_BGP_ATTR_PMSI_TYPE, |
1c50c1c0 | 3208 | "Invalid PMSI tunnel attribute type %d", tnl_type); |
7fd077aa | 3209 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, |
3210 | args->total); | |
3211 | } | |
3212 | if (tnl_type == PMSI_TNLTYPE_INGR_REPL) { | |
3213 | if (length != 9) { | |
e50f7cfd | 3214 | flog_err(EC_BGP_ATTR_PMSI_LEN, |
1c50c1c0 QY |
3215 | "Bad PMSI tunnel attribute length %d for IR", |
3216 | length); | |
052ea98b | 3217 | return bgp_attr_malformed( |
3218 | args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3219 | args->total); | |
7fd077aa | 3220 | } |
3221 | } | |
3222 | ||
3223 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL); | |
2a3f51cf | 3224 | bgp_attr_set_pmsi_tnl_type(attr, tnl_type); |
355f3c11 | 3225 | stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES); |
7fd077aa | 3226 | |
3227 | /* Forward read pointer of input stream. */ | |
355f3c11 | 3228 | stream_forward_getp(peer->curr, length - attr_parse_len); |
7fd077aa | 3229 | |
3230 | return BGP_ATTR_PARSE_PROCEED; | |
3231 | } | |
3232 | ||
97a52c82 DA |
3233 | /* AIGP attribute (rfc7311) */ |
3234 | static enum bgp_attr_parse_ret bgp_attr_aigp(struct bgp_attr_parser_args *args) | |
3235 | { | |
3236 | struct peer *const peer = args->peer; | |
3237 | struct attr *const attr = args->attr; | |
3238 | const bgp_size_t length = args->length; | |
3239 | uint8_t *s = stream_pnt(peer->curr); | |
3240 | uint64_t aigp = 0; | |
3241 | ||
3242 | /* If an AIGP attribute is received on a BGP session for which | |
3243 | * AIGP_SESSION is disabled, the attribute MUST be treated exactly | |
3244 | * as if it were an unrecognized non-transitive attribute. | |
3245 | * That is, it "MUST be quietly ignored and not passed along to | |
3246 | * other BGP peers". | |
3247 | * For Internal BGP (IBGP) sessions, and for External BGP (EBGP) | |
3248 | * sessions between members of the same BGP Confederation, | |
3249 | * the default value of AIGP_SESSION SHOULD be "enabled". | |
3250 | */ | |
3251 | if (peer->sort == BGP_PEER_EBGP && | |
3252 | !CHECK_FLAG(peer->flags, PEER_FLAG_AIGP)) { | |
3253 | zlog_warn( | |
3254 | "%pBP received AIGP attribute, but eBGP peer do not support it", | |
3255 | peer); | |
3256 | goto aigp_ignore; | |
3257 | } | |
3258 | ||
e2863b4f | 3259 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
3260 | goto aigp_ignore; |
3261 | ||
97a52c82 DA |
3262 | if (!bgp_attr_aigp_valid(s, length)) |
3263 | goto aigp_ignore; | |
3264 | ||
3265 | /* Extract AIGP Metric TLV */ | |
3266 | if (bgp_attr_aigp_get_tlv_metric(s, length, &aigp)) | |
3267 | bgp_attr_set_aigp_metric(attr, aigp); | |
3268 | ||
3269 | aigp_ignore: | |
3270 | stream_forward_getp(peer->curr, length); | |
3271 | ||
e2863b4f | 3272 | return bgp_attr_ignore(peer, args->type); |
97a52c82 DA |
3273 | } |
3274 | ||
d864dd9e EB |
3275 | /* OTC attribute. */ |
3276 | static enum bgp_attr_parse_ret bgp_attr_otc(struct bgp_attr_parser_args *args) | |
3277 | { | |
3278 | struct peer *const peer = args->peer; | |
3279 | struct attr *const attr = args->attr; | |
3280 | const bgp_size_t length = args->length; | |
3281 | ||
3282 | /* Length check. */ | |
3283 | if (length != 4) { | |
3284 | flog_err(EC_BGP_ATTR_LEN, "OTC attribute length isn't 4 [%u]", | |
3285 | length); | |
3286 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, | |
3287 | args->total); | |
3288 | } | |
3289 | ||
e2863b4f | 3290 | if (peer->discard_attrs[args->type] || peer->withdraw_attrs[args->type]) |
a5c6a9b1 DA |
3291 | goto otc_ignore; |
3292 | ||
d864dd9e | 3293 | attr->otc = stream_getl(peer->curr); |
adc1c459 DA |
3294 | if (!attr->otc) { |
3295 | flog_err(EC_BGP_ATTR_MAL_AS_PATH, "OTC attribute value is 0"); | |
3296 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH, | |
3297 | args->total); | |
3298 | } | |
d864dd9e EB |
3299 | |
3300 | attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_OTC); | |
3301 | ||
3302 | return BGP_ATTR_PARSE_PROCEED; | |
a5c6a9b1 DA |
3303 | |
3304 | otc_ignore: | |
3305 | stream_forward_getp(peer->curr, length); | |
3306 | ||
e2863b4f | 3307 | return bgp_attr_ignore(peer, args->type); |
d864dd9e EB |
3308 | } |
3309 | ||
718e3744 | 3310 | /* BGP unknown attribute treatment. */ |
79288e4c DA |
3311 | static enum bgp_attr_parse_ret |
3312 | bgp_attr_unknown(struct bgp_attr_parser_args *args) | |
d62a17ae | 3313 | { |
3314 | bgp_size_t total = args->total; | |
3315 | struct transit *transit; | |
3316 | struct peer *const peer = args->peer; | |
3317 | struct attr *const attr = args->attr; | |
d7c0a89a QY |
3318 | uint8_t *const startp = args->startp; |
3319 | const uint8_t type = args->type; | |
3320 | const uint8_t flag = args->flags; | |
d62a17ae | 3321 | const bgp_size_t length = args->length; |
3322 | ||
3323 | if (bgp_debug_update(peer, NULL, NULL, 1)) | |
3324 | zlog_debug( | |
3325 | "%s Unknown attribute is received (type %d, length %d)", | |
3326 | peer->host, type, length); | |
3327 | ||
3328 | /* Forward read pointer of input stream. */ | |
424ab01d | 3329 | stream_forward_getp(peer->curr, length); |
d62a17ae | 3330 | |
e2863b4f DA |
3331 | if (peer->discard_attrs[type] || peer->withdraw_attrs[type]) |
3332 | return bgp_attr_ignore(peer, type); | |
a5c6a9b1 | 3333 | |
d62a17ae | 3334 | /* If any of the mandatory well-known attributes are not recognized, |
3335 | then the Error Subcode is set to Unrecognized Well-known | |
3336 | Attribute. The Data field contains the unrecognized attribute | |
3337 | (type, length and value). */ | |
3338 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { | |
3339 | return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR, | |
3340 | args->total); | |
3341 | } | |
3342 | ||
3343 | /* Unrecognized non-transitive optional attributes must be quietly | |
3344 | ignored and not passed along to other BGP peers. */ | |
3345 | if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)) | |
3346 | return BGP_ATTR_PARSE_PROCEED; | |
3347 | ||
3348 | /* If a path with recognized transitive optional attribute is | |
3349 | accepted and passed along to other BGP peers and the Partial bit | |
3350 | in the Attribute Flags octet is set to 1 by some previous AS, it | |
3351 | is not set back to 0 by the current AS. */ | |
3352 | SET_FLAG(*startp, BGP_ATTR_FLAG_PARTIAL); | |
3353 | ||
3354 | /* Store transitive attribute to the end of attr->transit. */ | |
04fb21e2 DS |
3355 | transit = bgp_attr_get_transit(attr); |
3356 | if (!transit) | |
3357 | transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit)); | |
d62a17ae | 3358 | |
0b04fa0e DS |
3359 | transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val, |
3360 | transit->length + total); | |
d62a17ae | 3361 | |
3362 | memcpy(transit->val + transit->length, startp, total); | |
3363 | transit->length += total; | |
04fb21e2 | 3364 | bgp_attr_set_transit(attr, transit); |
d62a17ae | 3365 | |
3366 | return BGP_ATTR_PARSE_PROCEED; | |
718e3744 | 3367 | } |
3368 | ||
bb7bef14 | 3369 | /* Well-known attribute check. */ |
d62a17ae | 3370 | static int bgp_attr_check(struct peer *peer, struct attr *attr) |
3371 | { | |
d7c0a89a | 3372 | uint8_t type = 0; |
d62a17ae | 3373 | |
3374 | /* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an | |
3375 | * empty UPDATE. */ | |
3376 | if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag) | |
3377 | return BGP_ATTR_PARSE_PROCEED; | |
3378 | ||
3379 | /* "An UPDATE message that contains the MP_UNREACH_NLRI is not required | |
3380 | to carry any other path attributes.", though if MP_REACH_NLRI or NLRI | |
3381 | are present, it should. Check for any other attribute being present | |
3382 | instead. | |
3383 | */ | |
404c82d5 PG |
3384 | if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) && |
3385 | CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI)))) | |
d62a17ae | 3386 | return BGP_ATTR_PARSE_PROCEED; |
3387 | ||
3388 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN))) | |
3389 | type = BGP_ATTR_ORIGIN; | |
3390 | ||
3391 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) | |
3392 | type = BGP_ATTR_AS_PATH; | |
3393 | ||
3394 | /* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present | |
3395 | * and | |
3396 | * NLRI is empty. We can't easily check NLRI empty here though. | |
3397 | */ | |
3398 | if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3399 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) | |
3400 | type = BGP_ATTR_NEXT_HOP; | |
3401 | ||
3402 | if (peer->sort == BGP_PEER_IBGP | |
3403 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))) | |
3404 | type = BGP_ATTR_LOCAL_PREF; | |
3405 | ||
4ba5a9c5 DA |
3406 | /* If any of the well-known mandatory attributes are not present |
3407 | * in an UPDATE message, then "treat-as-withdraw" MUST be used. | |
3408 | */ | |
d62a17ae | 3409 | if (type) { |
e50f7cfd | 3410 | flog_warn(EC_BGP_MISSING_ATTRIBUTE, |
559aaa30 | 3411 | "%s Missing well-known attribute %s.", peer->host, |
d62a17ae | 3412 | lookup_msg(attr_str, type, NULL)); |
4ba5a9c5 | 3413 | return BGP_ATTR_PARSE_WITHDRAW; |
d62a17ae | 3414 | } |
3415 | return BGP_ATTR_PARSE_PROCEED; | |
bb7bef14 PJ |
3416 | } |
3417 | ||
718e3744 | 3418 | /* Read attribute of update packet. This function is called from |
8b366b9c | 3419 | bgp_update_receive() in bgp_packet.c. */ |
79288e4c DA |
3420 | enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr, |
3421 | bgp_size_t size, | |
3422 | struct bgp_nlri *mp_update, | |
3423 | struct bgp_nlri *mp_withdraw) | |
d62a17ae | 3424 | { |
79288e4c | 3425 | enum bgp_attr_parse_ret ret; |
d7c0a89a QY |
3426 | uint8_t flag = 0; |
3427 | uint8_t type = 0; | |
d62a17ae | 3428 | bgp_size_t length; |
d7c0a89a QY |
3429 | uint8_t *startp, *endp; |
3430 | uint8_t *attr_endp; | |
3431 | uint8_t seen[BGP_ATTR_BITMAP_SIZE]; | |
d62a17ae | 3432 | /* we need the as4_path only until we have synthesized the as_path with |
3433 | * it */ | |
3434 | /* same goes for as4_aggregator */ | |
3435 | struct aspath *as4_path = NULL; | |
3436 | as_t as4_aggregator = 0; | |
3437 | struct in_addr as4_aggregator_addr = {.s_addr = 0}; | |
04fb21e2 | 3438 | struct transit *transit; |
d62a17ae | 3439 | |
3440 | /* Initialize bitmap. */ | |
3441 | memset(seen, 0, BGP_ATTR_BITMAP_SIZE); | |
3442 | ||
3443 | /* End pointer of BGP attribute. */ | |
3444 | endp = BGP_INPUT_PNT(peer) + size; | |
3445 | ||
3446 | /* Get attributes to the end of attribute length. */ | |
3447 | while (BGP_INPUT_PNT(peer) < endp) { | |
3448 | /* Check remaining length check.*/ | |
3449 | if (endp - BGP_INPUT_PNT(peer) < BGP_ATTR_MIN_LEN) { | |
3450 | /* XXX warning: long int format, int arg (arg 5) */ | |
ade6974d | 3451 | flog_warn( |
e50f7cfd | 3452 | EC_BGP_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3453 | "%s: error BGP attribute length %lu is smaller than min len", |
3454 | peer->host, | |
3455 | (unsigned long)(endp | |
3456 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3457 | |
3458 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3459 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3460 | ret = BGP_ATTR_PARSE_ERROR; |
3461 | goto done; | |
d62a17ae | 3462 | } |
718e3744 | 3463 | |
d62a17ae | 3464 | /* Fetch attribute flag and type. */ |
3465 | startp = BGP_INPUT_PNT(peer); | |
3466 | /* "The lower-order four bits of the Attribute Flags octet are | |
3467 | unused. They MUST be zero when sent and MUST be ignored when | |
3468 | received." */ | |
3469 | flag = 0xF0 & stream_getc(BGP_INPUT(peer)); | |
3470 | type = stream_getc(BGP_INPUT(peer)); | |
3471 | ||
3472 | /* Check whether Extended-Length applies and is in bounds */ | |
3473 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) | |
3474 | && ((endp - startp) < (BGP_ATTR_MIN_LEN + 1))) { | |
ade6974d | 3475 | flog_warn( |
e50f7cfd | 3476 | EC_BGP_EXT_ATTRIBUTE_TOO_SMALL, |
ade6974d QY |
3477 | "%s: Extended length set, but just %lu bytes of attr header", |
3478 | peer->host, | |
3479 | (unsigned long)(endp | |
3480 | - stream_pnt(BGP_INPUT(peer)))); | |
d62a17ae | 3481 | |
3482 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3483 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3484 | ret = BGP_ATTR_PARSE_ERROR; |
3485 | goto done; | |
d62a17ae | 3486 | } |
718e3744 | 3487 | |
d62a17ae | 3488 | /* Check extended attribue length bit. */ |
3489 | if (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN)) | |
3490 | length = stream_getw(BGP_INPUT(peer)); | |
3491 | else | |
3492 | length = stream_getc(BGP_INPUT(peer)); | |
718e3744 | 3493 | |
d62a17ae | 3494 | /* If any attribute appears more than once in the UPDATE |
3495 | message, then the Error Subcode is set to Malformed Attribute | |
3496 | List. */ | |
718e3744 | 3497 | |
d62a17ae | 3498 | if (CHECK_BITMAP(seen, type)) { |
ade6974d | 3499 | flog_warn( |
e50f7cfd | 3500 | EC_BGP_ATTRIBUTE_REPEATED, |
ade6974d QY |
3501 | "%s: error BGP attribute type %d appears twice in a message", |
3502 | peer->host, type); | |
718e3744 | 3503 | |
d62a17ae | 3504 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, |
3505 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3506 | ret = BGP_ATTR_PARSE_ERROR; |
3507 | goto done; | |
d62a17ae | 3508 | } |
3509 | ||
3510 | /* Set type to bitmap to check duplicate attribute. `type' is | |
3511 | unsigned char so it never overflow bitmap range. */ | |
3512 | ||
3513 | SET_BITMAP(seen, type); | |
3514 | ||
3515 | /* Overflow check. */ | |
3516 | attr_endp = BGP_INPUT_PNT(peer) + length; | |
3517 | ||
3518 | if (attr_endp > endp) { | |
ade6974d | 3519 | flog_warn( |
e50f7cfd | 3520 | EC_BGP_ATTRIBUTE_TOO_LARGE, |
ade6974d QY |
3521 | "%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", |
3522 | peer->host, type, length, size, attr_endp, | |
3523 | endp); | |
dacffad4 QY |
3524 | /* |
3525 | * RFC 4271 6.3 | |
3526 | * If any recognized attribute has an Attribute | |
3527 | * Length that conflicts with the expected length | |
3528 | * (based on the attribute type code), then the | |
3529 | * Error Subcode MUST be set to Attribute Length | |
3530 | * Error. The Data field MUST contain the erroneous | |
3531 | * attribute (type, length, and value). | |
3532 | * ---------- | |
3533 | * We do not currently have a good way to determine the | |
3534 | * length of the attribute independent of the length | |
3535 | * received in the message. Instead we send the | |
3536 | * minimum between the amount of data we have and the | |
3537 | * amount specified by the attribute length field. | |
3538 | * | |
3539 | * Instead of directly passing in the packet buffer and | |
3540 | * offset we use the stream_get* functions to read into | |
3541 | * a stack buffer, since they perform bounds checking | |
3542 | * and we are working with untrusted data. | |
3543 | */ | |
ef56aee4 | 3544 | unsigned char ndata[peer->max_packet_size]; |
dacffad4 QY |
3545 | memset(ndata, 0x00, sizeof(ndata)); |
3546 | size_t lfl = | |
3547 | CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1; | |
3548 | /* Rewind to end of flag field */ | |
763a5d3c | 3549 | stream_rewind_getp(BGP_INPUT(peer), (1 + lfl)); |
dacffad4 QY |
3550 | /* Type */ |
3551 | stream_get(&ndata[0], BGP_INPUT(peer), 1); | |
3552 | /* Length */ | |
3553 | stream_get(&ndata[1], BGP_INPUT(peer), lfl); | |
3554 | /* Value */ | |
3555 | size_t atl = attr_endp - startp; | |
3556 | size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer))); | |
3557 | stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl); | |
3558 | ||
d62a17ae | 3559 | bgp_notify_send_with_data( |
3560 | peer, BGP_NOTIFY_UPDATE_ERR, | |
dacffad4 QY |
3561 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata, |
3562 | ndl + lfl + 1); | |
3563 | ||
b6a171c7 QY |
3564 | ret = BGP_ATTR_PARSE_ERROR; |
3565 | goto done; | |
d62a17ae | 3566 | } |
3567 | ||
3568 | struct bgp_attr_parser_args attr_args = { | |
3569 | .peer = peer, | |
3570 | .length = length, | |
3571 | .attr = attr, | |
3572 | .type = type, | |
3573 | .flags = flag, | |
3574 | .startp = startp, | |
3575 | .total = attr_endp - startp, | |
3576 | }; | |
3577 | ||
3578 | ||
3579 | /* If any recognized attribute has Attribute Flags that conflict | |
3580 | with the Attribute Type Code, then the Error Subcode is set | |
3581 | to | |
3582 | Attribute Flags Error. The Data field contains the erroneous | |
3583 | attribute (type, length and value). */ | |
3584 | if (bgp_attr_flag_invalid(&attr_args)) { | |
d62a17ae | 3585 | ret = bgp_attr_malformed( |
3586 | &attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, | |
3587 | attr_args.total); | |
3588 | if (ret == BGP_ATTR_PARSE_PROCEED) | |
3589 | continue; | |
b6a171c7 | 3590 | goto done; |
d62a17ae | 3591 | } |
3592 | ||
3593 | /* OK check attribute and store it's value. */ | |
3594 | switch (type) { | |
3595 | case BGP_ATTR_ORIGIN: | |
3596 | ret = bgp_attr_origin(&attr_args); | |
3597 | break; | |
3598 | case BGP_ATTR_AS_PATH: | |
3599 | ret = bgp_attr_aspath(&attr_args); | |
3600 | break; | |
3601 | case BGP_ATTR_AS4_PATH: | |
3602 | ret = bgp_attr_as4_path(&attr_args, &as4_path); | |
3603 | break; | |
3604 | case BGP_ATTR_NEXT_HOP: | |
3605 | ret = bgp_attr_nexthop(&attr_args); | |
3606 | break; | |
3607 | case BGP_ATTR_MULTI_EXIT_DISC: | |
3608 | ret = bgp_attr_med(&attr_args); | |
3609 | break; | |
3610 | case BGP_ATTR_LOCAL_PREF: | |
3611 | ret = bgp_attr_local_pref(&attr_args); | |
3612 | break; | |
3613 | case BGP_ATTR_ATOMIC_AGGREGATE: | |
3614 | ret = bgp_attr_atomic(&attr_args); | |
3615 | break; | |
3616 | case BGP_ATTR_AGGREGATOR: | |
3617 | ret = bgp_attr_aggregator(&attr_args); | |
3618 | break; | |
3619 | case BGP_ATTR_AS4_AGGREGATOR: | |
3620 | ret = bgp_attr_as4_aggregator(&attr_args, | |
3621 | &as4_aggregator, | |
3622 | &as4_aggregator_addr); | |
3623 | break; | |
3624 | case BGP_ATTR_COMMUNITIES: | |
3625 | ret = bgp_attr_community(&attr_args); | |
3626 | break; | |
3627 | case BGP_ATTR_LARGE_COMMUNITIES: | |
3628 | ret = bgp_attr_large_community(&attr_args); | |
3629 | break; | |
3630 | case BGP_ATTR_ORIGINATOR_ID: | |
3631 | ret = bgp_attr_originator_id(&attr_args); | |
3632 | break; | |
3633 | case BGP_ATTR_CLUSTER_LIST: | |
3634 | ret = bgp_attr_cluster_list(&attr_args); | |
3635 | break; | |
3636 | case BGP_ATTR_MP_REACH_NLRI: | |
3637 | ret = bgp_mp_reach_parse(&attr_args, mp_update); | |
3638 | break; | |
3639 | case BGP_ATTR_MP_UNREACH_NLRI: | |
3640 | ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw); | |
3641 | break; | |
3642 | case BGP_ATTR_EXT_COMMUNITIES: | |
3643 | ret = bgp_attr_ext_communities(&attr_args); | |
3644 | break; | |
1e20238a | 3645 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 3646 | case BGP_ATTR_VNC: |
65efcfce | 3647 | #endif |
d62a17ae | 3648 | case BGP_ATTR_ENCAP: |
3649 | ret = bgp_attr_encap(type, peer, length, attr, flag, | |
3650 | startp); | |
3651 | break; | |
3652 | case BGP_ATTR_PREFIX_SID: | |
45a06b11 | 3653 | ret = bgp_attr_prefix_sid(&attr_args); |
d62a17ae | 3654 | break; |
7fd077aa | 3655 | case BGP_ATTR_PMSI_TUNNEL: |
3656 | ret = bgp_attr_pmsi_tunnel(&attr_args); | |
3657 | break; | |
9a659715 PG |
3658 | case BGP_ATTR_IPV6_EXT_COMMUNITIES: |
3659 | ret = bgp_attr_ipv6_ext_communities(&attr_args); | |
3660 | break; | |
d864dd9e EB |
3661 | case BGP_ATTR_OTC: |
3662 | ret = bgp_attr_otc(&attr_args); | |
3663 | break; | |
97a52c82 DA |
3664 | case BGP_ATTR_AIGP: |
3665 | ret = bgp_attr_aigp(&attr_args); | |
3666 | break; | |
d62a17ae | 3667 | default: |
3668 | ret = bgp_attr_unknown(&attr_args); | |
3669 | break; | |
3670 | } | |
3671 | ||
3672 | if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) { | |
3673 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3674 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
3675 | ret = BGP_ATTR_PARSE_ERROR; | |
b6a171c7 | 3676 | goto done; |
d62a17ae | 3677 | } |
3678 | ||
9b9df989 | 3679 | if (ret == BGP_ATTR_PARSE_EOR) { |
b6a171c7 | 3680 | goto done; |
9b9df989 DS |
3681 | } |
3682 | ||
d62a17ae | 3683 | if (ret == BGP_ATTR_PARSE_ERROR) { |
e50f7cfd | 3684 | flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR, |
559aaa30 | 3685 | "%s: Attribute %s, parse error", peer->host, |
d62a17ae | 3686 | lookup_msg(attr_str, type, NULL)); |
b6a171c7 | 3687 | goto done; |
d62a17ae | 3688 | } |
3689 | if (ret == BGP_ATTR_PARSE_WITHDRAW) { | |
ade6974d | 3690 | flog_warn( |
e50f7cfd | 3691 | EC_BGP_ATTRIBUTE_PARSE_WITHDRAW, |
d62a17ae | 3692 | "%s: Attribute %s, parse error - treating as withdrawal", |
3693 | peer->host, lookup_msg(attr_str, type, NULL)); | |
b6a171c7 | 3694 | goto done; |
d62a17ae | 3695 | } |
3696 | ||
3697 | /* Check the fetched length. */ | |
3698 | if (BGP_INPUT_PNT(peer) != attr_endp) { | |
e50f7cfd | 3699 | flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR, |
559aaa30 | 3700 | "%s: BGP attribute %s, fetch error", |
d62a17ae | 3701 | peer->host, lookup_msg(attr_str, type, NULL)); |
3702 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3703 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3704 | ret = BGP_ATTR_PARSE_ERROR; |
3705 | goto done; | |
d62a17ae | 3706 | } |
718e3744 | 3707 | } |
d62a17ae | 3708 | |
e5d4cda0 HS |
3709 | /* |
3710 | * draft-ietf-idr-bgp-prefix-sid-27#section-3: | |
3711 | * About Prefix-SID path attribute, | |
3712 | * Label-Index TLV(type1) and The Originator SRGB TLV(type-3) | |
3713 | * may only appear in a BGP Prefix-SID attribute attached to | |
3714 | * IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]). | |
3715 | * It MUST be ignored when received for other BGP AFI/SAFI combinations. | |
3716 | */ | |
3717 | if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST) | |
3718 | attr->label_index = BGP_INVALID_LABEL_INDEX; | |
3719 | ||
d62a17ae | 3720 | /* Check final read pointer is same as end pointer. */ |
3721 | if (BGP_INPUT_PNT(peer) != endp) { | |
e50f7cfd | 3722 | flog_warn(EC_BGP_ATTRIBUTES_MISMATCH, |
559aaa30 | 3723 | "%s: BGP attribute %s, length mismatch", peer->host, |
d62a17ae | 3724 | lookup_msg(attr_str, type, NULL)); |
3725 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3726 | BGP_NOTIFY_UPDATE_ATTR_LENG_ERR); | |
b6a171c7 QY |
3727 | |
3728 | ret = BGP_ATTR_PARSE_ERROR; | |
3729 | goto done; | |
d62a17ae | 3730 | } |
3731 | ||
88f33d66 | 3732 | /* |
3733 | * RFC4271: If the NEXT_HOP attribute field is syntactically incorrect, | |
3734 | * then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute. | |
3735 | * This is implemented below and will result in a NOTIFICATION. If the | |
3736 | * NEXT_HOP attribute is semantically incorrect, the error SHOULD be | |
3737 | * logged, and the route SHOULD be ignored. In this case, a NOTIFICATION | |
3738 | * message SHOULD NOT be sent. This is implemented elsewhere. | |
3739 | * | |
3740 | * RFC4760: An UPDATE message that carries no NLRI, other than the one | |
3741 | * encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP | |
3742 | * attribute. If such a message contains the NEXT_HOP attribute, the BGP | |
3743 | * speaker that receives the message SHOULD ignore this attribute. | |
3744 | */ | |
3745 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) | |
3746 | && !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) { | |
9738e9aa | 3747 | if (bgp_attr_nexthop_valid(peer, attr) < 0) { |
b6a171c7 QY |
3748 | ret = BGP_ATTR_PARSE_ERROR; |
3749 | goto done; | |
88f33d66 | 3750 | } |
3751 | } | |
3752 | ||
d62a17ae | 3753 | /* Check all mandatory well-known attributes are present */ |
11dbcdd3 DA |
3754 | ret = bgp_attr_check(peer, attr); |
3755 | if (ret < 0) | |
b6a171c7 | 3756 | goto done; |
d62a17ae | 3757 | |
3758 | /* | |
3759 | * At this place we can see whether we got AS4_PATH and/or | |
3760 | * AS4_AGGREGATOR from a 16Bit peer and act accordingly. | |
3761 | * We can not do this before we've read all attributes because | |
3762 | * the as4 handling does not say whether AS4_PATH has to be sent | |
3763 | * after AS_PATH or not - and when AS4_AGGREGATOR will be send | |
3764 | * in relationship to AGGREGATOR. | |
3765 | * So, to be defensive, we are not relying on any order and read | |
3766 | * all attributes first, including these 32bit ones, and now, | |
3767 | * afterwards, we look what and if something is to be done for as4. | |
3768 | * | |
3769 | * It is possible to not have AS_PATH, e.g. GR EoR and sole | |
3770 | * MP_UNREACH_NLRI. | |
3771 | */ | |
3772 | /* actually... this doesn't ever return failure currently, but | |
3773 | * better safe than sorry */ | |
3774 | if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH)) | |
3775 | && bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator, | |
3776 | &as4_aggregator_addr)) { | |
3777 | bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR, | |
3778 | BGP_NOTIFY_UPDATE_MAL_ATTR); | |
b6a171c7 QY |
3779 | ret = BGP_ATTR_PARSE_ERROR; |
3780 | goto done; | |
d62a17ae | 3781 | } |
3782 | ||
d62a17ae | 3783 | /* |
3784 | * Finally do the checks on the aspath we did not do yet | |
3785 | * because we waited for a potentially synthesized aspath. | |
3786 | */ | |
3787 | if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))) { | |
3788 | ret = bgp_attr_aspath_check(peer, attr); | |
3789 | if (ret != BGP_ATTR_PARSE_PROCEED) | |
b6a171c7 | 3790 | goto done; |
d62a17ae | 3791 | } |
718e3744 | 3792 | |
b6a171c7 | 3793 | ret = BGP_ATTR_PARSE_PROCEED; |
b6a171c7 | 3794 | done: |
5e0e9c09 | 3795 | |
b6a171c7 QY |
3796 | /* |
3797 | * At this stage, we have done all fiddling with as4, and the | |
3798 | * resulting info is in attr->aggregator resp. attr->aspath so | |
3799 | * we can chuck as4_aggregator and as4_path alltogether in order | |
3800 | * to save memory | |
3801 | */ | |
b7b3e63c DA |
3802 | /* |
3803 | * unintern - it is in the hash | |
3804 | * The flag that we got this is still there, but that | |
3805 | * does not do any trouble | |
3806 | */ | |
3807 | aspath_unintern(&as4_path); | |
b6a171c7 | 3808 | |
04fb21e2 | 3809 | transit = bgp_attr_get_transit(attr); |
b6a171c7 QY |
3810 | if (ret != BGP_ATTR_PARSE_ERROR) { |
3811 | /* Finally intern unknown attribute. */ | |
04fb21e2 DS |
3812 | if (transit) |
3813 | bgp_attr_set_transit(attr, transit_intern(transit)); | |
b6a171c7 QY |
3814 | if (attr->encap_subtlvs) |
3815 | attr->encap_subtlvs = encap_intern(attr->encap_subtlvs, | |
3816 | ENCAP_SUBTLV_TYPE); | |
1e20238a | 3817 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3818 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3819 | bgp_attr_get_vnc_subtlvs(attr); | |
3820 | ||
3821 | if (vnc_subtlvs) | |
3822 | bgp_attr_set_vnc_subtlvs( | |
3823 | attr, | |
3824 | encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE)); | |
5e0e9c09 QY |
3825 | #endif |
3826 | } else { | |
04fb21e2 DS |
3827 | if (transit) { |
3828 | transit_free(transit); | |
3829 | bgp_attr_set_transit(attr, NULL); | |
5e0e9c09 QY |
3830 | } |
3831 | ||
3832 | bgp_attr_flush_encap(attr); | |
3833 | }; | |
3834 | ||
3835 | /* Sanity checks */ | |
04fb21e2 DS |
3836 | transit = bgp_attr_get_transit(attr); |
3837 | if (transit) | |
3838 | assert(transit->refcnt > 0); | |
d62a17ae | 3839 | if (attr->encap_subtlvs) |
5e0e9c09 | 3840 | assert(attr->encap_subtlvs->refcnt > 0); |
1e20238a | 3841 | #ifdef ENABLE_BGP_VNC |
91ebf12c DS |
3842 | struct bgp_attr_encap_subtlv *vnc_subtlvs = |
3843 | bgp_attr_get_vnc_subtlvs(attr); | |
3844 | ||
3845 | if (vnc_subtlvs) | |
3846 | assert(vnc_subtlvs->refcnt > 0); | |
bede7744 | 3847 | #endif |
718e3744 | 3848 | |
b6a171c7 | 3849 | return ret; |
d62a17ae | 3850 | } |
3851 | ||
f4bd90c5 LK |
3852 | /* |
3853 | * Extract the tunnel type from extended community | |
3854 | */ | |
3855 | void bgp_attr_extcom_tunnel_type(struct attr *attr, | |
fa346686 | 3856 | bgp_encap_types *tunnel_type) |
f4bd90c5 LK |
3857 | { |
3858 | struct ecommunity *ecom; | |
f6e07e1b DS |
3859 | uint32_t i; |
3860 | ||
f4bd90c5 | 3861 | if (!attr) |
fa346686 | 3862 | return; |
f4bd90c5 | 3863 | |
b53e67a3 | 3864 | ecom = bgp_attr_get_ecommunity(attr); |
f4bd90c5 | 3865 | if (!ecom || !ecom->size) |
fa346686 | 3866 | return; |
f4bd90c5 LK |
3867 | |
3868 | for (i = 0; i < ecom->size; i++) { | |
3869 | uint8_t *pnt; | |
3870 | uint8_t type, sub_type; | |
3871 | ||
3872 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
3873 | type = pnt[0]; | |
3874 | sub_type = pnt[1]; | |
3875 | if (!(type == ECOMMUNITY_ENCODE_OPAQUE && | |
3876 | sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP)) | |
3877 | continue; | |
3878 | *tunnel_type = ((pnt[6] << 8) | pnt[7]); | |
fa346686 | 3879 | return; |
f4bd90c5 LK |
3880 | } |
3881 | ||
fa346686 | 3882 | return; |
f4bd90c5 LK |
3883 | } |
3884 | ||
d62a17ae | 3885 | size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi, |
3886 | safi_t safi, struct bpacket_attr_vec_arr *vecarr, | |
3887 | struct attr *attr) | |
3888 | { | |
3889 | size_t sizep; | |
617975d1 DS |
3890 | iana_afi_t pkt_afi = IANA_AFI_IPV4; |
3891 | iana_safi_t pkt_safi = IANA_SAFI_UNICAST; | |
d62a17ae | 3892 | afi_t nh_afi; |
3893 | ||
3894 | /* Set extended bit always to encode the attribute length as 2 bytes */ | |
3895 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
3896 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
3897 | sizep = stream_get_endp(s); | |
3898 | stream_putw(s, 0); /* Marker: Attribute length. */ | |
3899 | ||
3900 | ||
3901 | /* Convert AFI, SAFI to values for packet. */ | |
3902 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
3903 | ||
3904 | stream_putw(s, pkt_afi); /* AFI */ | |
3905 | stream_putc(s, pkt_safi); /* SAFI */ | |
3906 | ||
3907 | /* Nexthop AFI */ | |
ce78a6fb | 3908 | if (afi == AFI_IP |
e496b420 HS |
3909 | && (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST |
3910 | || safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST)) | |
d62a17ae | 3911 | nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP; |
211ee7aa PG |
3912 | else if (safi == SAFI_FLOWSPEC) |
3913 | nh_afi = afi; | |
d62a17ae | 3914 | else |
3915 | nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); | |
3916 | ||
3917 | /* Nexthop */ | |
3918 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr); | |
3919 | switch (nh_afi) { | |
3920 | case AFI_IP: | |
3921 | switch (safi) { | |
3922 | case SAFI_UNICAST: | |
3923 | case SAFI_MULTICAST: | |
3924 | case SAFI_LABELED_UNICAST: | |
3925 | stream_putc(s, 4); | |
3926 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3927 | break; | |
3928 | case SAFI_MPLS_VPN: | |
3929 | stream_putc(s, 12); | |
3930 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3931 | stream_putl(s, 0); | |
3932 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3933 | break; | |
3934 | case SAFI_ENCAP: | |
3935 | case SAFI_EVPN: | |
3936 | stream_putc(s, 4); | |
3937 | stream_put(s, &attr->mp_nexthop_global_in, 4); | |
3938 | break; | |
7c40bf39 | 3939 | case SAFI_FLOWSPEC: |
211ee7aa PG |
3940 | if (attr->mp_nexthop_len == 0) |
3941 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
3942 | else { | |
3943 | stream_putc(s, attr->mp_nexthop_len); | |
3944 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
3945 | } | |
722e8011 DS |
3946 | break; |
3947 | case SAFI_UNSPEC: | |
3948 | case SAFI_MAX: | |
3949 | assert(!"SAFI's UNSPEC or MAX being specified are a DEV ESCAPE"); | |
d62a17ae | 3950 | break; |
3951 | } | |
3952 | break; | |
3953 | case AFI_IP6: | |
3954 | switch (safi) { | |
3955 | case SAFI_UNICAST: | |
3956 | case SAFI_MULTICAST: | |
3957 | case SAFI_LABELED_UNICAST: | |
3958 | case SAFI_EVPN: { | |
3959 | if (attr->mp_nexthop_len | |
3960 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
3961 | stream_putc(s, | |
3962 | BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL); | |
3963 | stream_put(s, &attr->mp_nexthop_global, | |
3964 | IPV6_MAX_BYTELEN); | |
3965 | stream_put(s, &attr->mp_nexthop_local, | |
3966 | IPV6_MAX_BYTELEN); | |
3967 | } else { | |
3968 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3969 | stream_put(s, &attr->mp_nexthop_global, | |
3970 | IPV6_MAX_BYTELEN); | |
3971 | } | |
3972 | } break; | |
3973 | case SAFI_MPLS_VPN: { | |
558e8f58 PG |
3974 | if (attr->mp_nexthop_len == |
3975 | BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) | |
3976 | stream_putc(s, attr->mp_nexthop_len); | |
3977 | else | |
3978 | stream_putc(s, BGP_ATTR_NHLEN_VPNV6_GLOBAL); | |
3979 | stream_putl(s, 0); /* RD = 0, per RFC */ | |
3980 | stream_putl(s, 0); | |
3981 | stream_put(s, &attr->mp_nexthop_global, | |
3982 | IPV6_MAX_BYTELEN); | |
35ac9b53 PG |
3983 | if (attr->mp_nexthop_len == |
3984 | BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) { | |
d62a17ae | 3985 | stream_putl(s, 0); /* RD = 0, per RFC */ |
3986 | stream_putl(s, 0); | |
3987 | stream_put(s, &attr->mp_nexthop_local, | |
3988 | IPV6_MAX_BYTELEN); | |
3989 | } | |
3990 | } break; | |
3991 | case SAFI_ENCAP: | |
3992 | stream_putc(s, IPV6_MAX_BYTELEN); | |
3993 | stream_put(s, &attr->mp_nexthop_global, | |
3994 | IPV6_MAX_BYTELEN); | |
3995 | break; | |
7c40bf39 | 3996 | case SAFI_FLOWSPEC: |
3997 | stream_putc(s, 0); /* no nexthop for flowspec */ | |
722e8011 DS |
3998 | break; |
3999 | case SAFI_UNSPEC: | |
4000 | case SAFI_MAX: | |
4001 | assert(!"SAFI's UNSPEC or MAX being specified are a DEV ESCAPE"); | |
d62a17ae | 4002 | break; |
4003 | } | |
4004 | break; | |
722e8011 | 4005 | case AFI_L2VPN: |
a83da8e1 | 4006 | if (safi != SAFI_FLOWSPEC) |
af4c2728 | 4007 | flog_err( |
e50f7cfd | 4008 | EC_BGP_ATTR_NH_SEND_LEN, |
14454c9f DS |
4009 | "Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d", |
4010 | peer->host, afi, safi, attr->mp_nexthop_len); | |
d62a17ae | 4011 | break; |
722e8011 DS |
4012 | case AFI_UNSPEC: |
4013 | case AFI_MAX: | |
4014 | assert(!"DEV ESCAPE: AFI_UNSPEC or AFI_MAX should not be used here"); | |
4015 | break; | |
d62a17ae | 4016 | } |
4017 | ||
4018 | /* SNPA */ | |
4019 | stream_putc(s, 0); | |
4020 | return sizep; | |
4021 | } | |
4022 | ||
4023 | void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
5f040085 DS |
4024 | const struct prefix *p, |
4025 | const struct prefix_rd *prd, mpls_label_t *label, | |
be92fc9f | 4026 | uint32_t num_labels, bool addpath_capable, |
5f040085 | 4027 | uint32_t addpath_tx_id, struct attr *attr) |
d62a17ae | 4028 | { |
233b1a38 DS |
4029 | switch (safi) { |
4030 | case SAFI_UNSPEC: | |
4031 | case SAFI_MAX: | |
4032 | assert(!"Dev escape usage of SAFI_UNSPEC or MAX"); | |
4033 | break; | |
4034 | case SAFI_MPLS_VPN: | |
be92fc9f | 4035 | if (addpath_capable) |
d62a17ae | 4036 | stream_putl(s, addpath_tx_id); |
4037 | /* Label, RD, Prefix write. */ | |
4038 | stream_putc(s, p->prefixlen + 88); | |
4039 | stream_put(s, label, BGP_LABEL_BYTES); | |
4040 | stream_put(s, prd->val, 8); | |
4041 | stream_put(s, &p->u.prefix, PSIZE(p->prefixlen)); | |
233b1a38 DS |
4042 | break; |
4043 | case SAFI_EVPN: | |
4044 | if (afi == AFI_L2VPN) | |
4045 | /* EVPN prefix - contents depend on type */ | |
4046 | bgp_evpn_encode_prefix(s, p, prd, label, num_labels, | |
4047 | attr, addpath_capable, | |
4048 | addpath_tx_id); | |
4049 | else | |
4050 | assert(!"Add encoding bits here for other AFI's"); | |
4051 | break; | |
4052 | case SAFI_LABELED_UNICAST: | |
d62a17ae | 4053 | /* Prefix write with label. */ |
be92fc9f | 4054 | stream_put_labeled_prefix(s, p, label, addpath_capable, |
ec15e1b5 | 4055 | addpath_tx_id); |
233b1a38 DS |
4056 | break; |
4057 | case SAFI_FLOWSPEC: | |
f1af8f04 PG |
4058 | stream_putc(s, p->u.prefix_flowspec.prefixlen); |
4059 | stream_put(s, (const void *)p->u.prefix_flowspec.ptr, | |
4060 | p->u.prefix_flowspec.prefixlen); | |
233b1a38 DS |
4061 | break; |
4062 | ||
4063 | case SAFI_UNICAST: | |
4064 | case SAFI_MULTICAST: | |
be92fc9f | 4065 | stream_put_prefix_addpath(s, p, addpath_capable, addpath_tx_id); |
233b1a38 DS |
4066 | break; |
4067 | case SAFI_ENCAP: | |
4068 | assert(!"Please add proper encoding of SAFI_ENCAP"); | |
4069 | break; | |
4070 | } | |
d62a17ae | 4071 | } |
4072 | ||
5f040085 DS |
4073 | size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
4074 | const struct prefix *p) | |
d62a17ae | 4075 | { |
4076 | int size = PSIZE(p->prefixlen); | |
4487f0bd DS |
4077 | |
4078 | switch (safi) { | |
4079 | case SAFI_UNSPEC: | |
4080 | case SAFI_MAX: | |
4081 | assert(!"Attempting to figure size for a SAFI_UNSPEC/SAFI_MAX this is a DEV ESCAPE"); | |
4082 | break; | |
4083 | case SAFI_UNICAST: | |
4084 | case SAFI_MULTICAST: | |
4085 | break; | |
4086 | case SAFI_MPLS_VPN: | |
d62a17ae | 4087 | size += 88; |
4487f0bd DS |
4088 | break; |
4089 | case SAFI_ENCAP: | |
4090 | /* This has to be wrong, but I don't know what to put here */ | |
4091 | assert(!"Do we try to use this?"); | |
4092 | break; | |
4093 | case SAFI_LABELED_UNICAST: | |
4195afbf | 4094 | size += BGP_LABEL_BYTES; |
4487f0bd DS |
4095 | break; |
4096 | case SAFI_EVPN: | |
4097 | /* | |
4098 | * TODO: Maximum possible for type-2, type-3 and type-5 | |
4099 | */ | |
4100 | if (afi == AFI_L2VPN) | |
4101 | size += 232; | |
4102 | else | |
4103 | assert(!"Attempting to figure size for SAFI_EVPN and !AFI_L2VPN and FRR will not have the proper values"); | |
4104 | break; | |
4105 | case SAFI_FLOWSPEC: | |
0a9705a1 | 4106 | size = ((struct prefix_fs *)p)->prefix.prefixlen; |
4487f0bd DS |
4107 | break; |
4108 | } | |
4109 | ||
d62a17ae | 4110 | return size; |
8c71e481 PM |
4111 | } |
4112 | ||
f4c89855 | 4113 | /* |
65efcfce | 4114 | * Encodes the tunnel encapsulation attribute, |
d62a17ae | 4115 | * and with ENABLE_BGP_VNC the VNC attribute which uses |
65efcfce | 4116 | * almost the same TLV format |
f4c89855 | 4117 | */ |
d62a17ae | 4118 | static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer, |
4119 | struct stream *s, struct attr *attr, | |
4120 | uint8_t attrtype) | |
4121 | { | |
4122 | unsigned int attrlenfield = 0; | |
4123 | unsigned int attrhdrlen = 0; | |
4124 | struct bgp_attr_encap_subtlv *subtlvs; | |
4125 | struct bgp_attr_encap_subtlv *st; | |
4126 | const char *attrname; | |
4127 | ||
9d303b37 DL |
4128 | if (!attr || (attrtype == BGP_ATTR_ENCAP |
4129 | && (!attr->encap_tunneltype | |
4130 | || attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS))) | |
d62a17ae | 4131 | return; |
4132 | ||
4133 | switch (attrtype) { | |
f4c89855 | 4134 | case BGP_ATTR_ENCAP: |
d62a17ae | 4135 | attrname = "Tunnel Encap"; |
4136 | subtlvs = attr->encap_subtlvs; | |
4137 | if (subtlvs == NULL) /* nothing to do */ | |
4138 | return; | |
4139 | /* | |
4140 | * The tunnel encap attr has an "outer" tlv. | |
4141 | * T = tunneltype, | |
4142 | * L = total length of subtlvs, | |
4143 | * V = concatenated subtlvs. | |
4144 | */ | |
4145 | attrlenfield = 2 + 2; /* T + L */ | |
4146 | attrhdrlen = 1 + 1; /* subTLV T + L */ | |
4147 | break; | |
f4c89855 | 4148 | |
1e20238a | 4149 | #ifdef ENABLE_BGP_VNC_ATTR |
65efcfce | 4150 | case BGP_ATTR_VNC: |
d62a17ae | 4151 | attrname = "VNC"; |
91ebf12c | 4152 | subtlvs = bgp_attr_get_vnc_subtlvs(attr); |
d62a17ae | 4153 | if (subtlvs == NULL) /* nothing to do */ |
4154 | return; | |
4155 | attrlenfield = 0; /* no outer T + L */ | |
4156 | attrhdrlen = 2 + 2; /* subTLV T + L */ | |
4157 | break; | |
65efcfce LB |
4158 | #endif |
4159 | ||
f4c89855 | 4160 | default: |
d62a17ae | 4161 | assert(0); |
4162 | } | |
4163 | ||
4164 | /* compute attr length */ | |
4165 | for (st = subtlvs; st; st = st->next) { | |
4166 | attrlenfield += (attrhdrlen + st->length); | |
4167 | } | |
4168 | ||
4169 | if (attrlenfield > 0xffff) { | |
4170 | zlog_info("%s attribute is too long (length=%d), can't send it", | |
4171 | attrname, attrlenfield); | |
4172 | return; | |
4173 | } | |
4174 | ||
4175 | if (attrlenfield > 0xff) { | |
4176 | /* 2-octet length field */ | |
996c9314 LB |
4177 | stream_putc(s, |
4178 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4179 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4180 | stream_putc(s, attrtype); |
4181 | stream_putw(s, attrlenfield & 0xffff); | |
4182 | } else { | |
4183 | /* 1-octet length field */ | |
4184 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL); | |
4185 | stream_putc(s, attrtype); | |
4186 | stream_putc(s, attrlenfield & 0xff); | |
4187 | } | |
4188 | ||
4189 | if (attrtype == BGP_ATTR_ENCAP) { | |
4190 | /* write outer T+L */ | |
4191 | stream_putw(s, attr->encap_tunneltype); | |
4192 | stream_putw(s, attrlenfield - 4); | |
4193 | } | |
4194 | ||
4195 | /* write each sub-tlv */ | |
4196 | for (st = subtlvs; st; st = st->next) { | |
4197 | if (attrtype == BGP_ATTR_ENCAP) { | |
4198 | stream_putc(s, st->type); | |
4199 | stream_putc(s, st->length); | |
1e20238a | 4200 | #ifdef ENABLE_BGP_VNC |
d62a17ae | 4201 | } else { |
4202 | stream_putw(s, st->type); | |
4203 | stream_putw(s, st->length); | |
65efcfce | 4204 | #endif |
d62a17ae | 4205 | } |
4206 | stream_put(s, st->value, st->length); | |
4207 | } | |
f4c89855 | 4208 | } |
f4c89855 | 4209 | |
d62a17ae | 4210 | void bgp_packet_mpattr_end(struct stream *s, size_t sizep) |
8c71e481 | 4211 | { |
d62a17ae | 4212 | /* Set MP attribute length. Don't count the (2) bytes used to encode |
4213 | the attr length */ | |
4214 | stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2); | |
8c71e481 PM |
4215 | } |
4216 | ||
3dc339cd | 4217 | static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi) |
6b5a72a3 DA |
4218 | { |
4219 | if (!BGP_AS_IS_PRIVATE(peer->local_as) | |
4220 | || (BGP_AS_IS_PRIVATE(peer->local_as) | |
4221 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4222 | PEER_FLAG_REMOVE_PRIVATE_AS) | |
4223 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4224 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL) | |
4225 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4226 | PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE) | |
4227 | && !CHECK_FLAG(peer->af_flags[afi][safi], | |
4228 | PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE))) | |
3dc339cd DA |
4229 | return true; |
4230 | return false; | |
6b5a72a3 DA |
4231 | } |
4232 | ||
718e3744 | 4233 | /* Make attribute packet. */ |
d62a17ae | 4234 | bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer, |
4235 | struct stream *s, struct attr *attr, | |
4236 | struct bpacket_attr_vec_arr *vecarr, | |
4237 | struct prefix *p, afi_t afi, safi_t safi, | |
4238 | struct peer *from, struct prefix_rd *prd, | |
d7c0a89a | 4239 | mpls_label_t *label, uint32_t num_labels, |
97a52c82 DA |
4240 | bool addpath_capable, uint32_t addpath_tx_id, |
4241 | struct bgp_path_info *bpi) | |
d62a17ae | 4242 | { |
4243 | size_t cp; | |
4244 | size_t aspath_sizep; | |
4245 | struct aspath *aspath; | |
4246 | int send_as4_path = 0; | |
4247 | int send_as4_aggregator = 0; | |
8cff42ad DA |
4248 | bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV) |
4249 | && CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV); | |
d62a17ae | 4250 | |
4251 | if (!bgp) | |
4252 | bgp = peer->bgp; | |
4253 | ||
4254 | /* Remember current pointer. */ | |
4255 | cp = stream_get_endp(s); | |
4256 | ||
4257 | if (p | |
4258 | && !((afi == AFI_IP && safi == SAFI_UNICAST) | |
4259 | && !peer_cap_enhe(peer, afi, safi))) { | |
4260 | size_t mpattrlen_pos = 0; | |
4261 | ||
4262 | mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi, | |
4263 | vecarr, attr); | |
996c9314 | 4264 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, |
be92fc9f | 4265 | num_labels, addpath_capable, |
996c9314 | 4266 | addpath_tx_id, attr); |
d62a17ae | 4267 | bgp_packet_mpattr_end(s, mpattrlen_pos); |
718e3744 | 4268 | } |
d62a17ae | 4269 | |
4270 | /* Origin attribute. */ | |
4271 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4272 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4273 | stream_putc(s, 1); | |
4274 | stream_putc(s, attr->origin); | |
4275 | ||
4276 | /* AS path attribute. */ | |
4277 | ||
4278 | /* If remote-peer is EBGP */ | |
4279 | if (peer->sort == BGP_PEER_EBGP | |
4280 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
4281 | PEER_FLAG_AS_PATH_UNCHANGED) | |
4282 | || attr->aspath->segments == NULL) | |
4283 | && (!CHECK_FLAG(peer->af_flags[afi][safi], | |
4284 | PEER_FLAG_RSERVER_CLIENT))) { | |
4285 | aspath = aspath_dup(attr->aspath); | |
4286 | ||
4287 | /* Even though we may not be configured for confederations we | |
4288 | * may have | |
4289 | * RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */ | |
4290 | aspath = aspath_delete_confed_seq(aspath); | |
4291 | ||
4292 | if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) { | |
db5a5ee6 DA |
4293 | /* A confed member, so we need to do the |
4294 | * AS_CONFED_SEQUENCE thing if it's outside a common | |
4295 | * administration. | |
4296 | * Configured confederation peers MUST be validated | |
4297 | * under BGP_PEER_CONFED, but if we have configured | |
4298 | * remote-as as AS_EXTERNAL, we need to check again | |
4299 | * if the peer belongs to us. | |
4300 | */ | |
4301 | if (bgp_confederation_peers_check(bgp, peer->as)) { | |
db5a5ee6 DA |
4302 | aspath = aspath_add_confed_seq(aspath, |
4303 | peer->local_as); | |
4304 | } else { | |
4305 | /* Stuff our path CONFED_ID on the front */ | |
4306 | aspath = aspath_add_seq(aspath, bgp->confed_id); | |
4307 | } | |
d62a17ae | 4308 | } else { |
4309 | if (peer->change_local_as) { | |
4310 | /* If replace-as is specified, we only use the | |
4311 | change_local_as when | |
4312 | advertising routes. */ | |
6b5a72a3 DA |
4313 | if (!CHECK_FLAG(peer->flags, |
4314 | PEER_FLAG_LOCAL_AS_REPLACE_AS)) | |
4315 | if (bgp_append_local_as(peer, afi, | |
4316 | safi)) | |
4317 | aspath = aspath_add_seq( | |
4318 | aspath, peer->local_as); | |
d62a17ae | 4319 | aspath = aspath_add_seq(aspath, |
4320 | peer->change_local_as); | |
4321 | } else { | |
4322 | aspath = aspath_add_seq(aspath, peer->local_as); | |
4323 | } | |
4324 | } | |
4325 | } else if (peer->sort == BGP_PEER_CONFED) { | |
4326 | /* A confed member, so we need to do the AS_CONFED_SEQUENCE | |
4327 | * thing */ | |
4328 | aspath = aspath_dup(attr->aspath); | |
4329 | aspath = aspath_add_confed_seq(aspath, peer->local_as); | |
4330 | } else | |
4331 | aspath = attr->aspath; | |
4332 | ||
4333 | /* If peer is not AS4 capable, then: | |
4334 | * - send the created AS_PATH out as AS4_PATH (optional, transitive), | |
4335 | * but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path | |
4336 | * segment | |
4337 | * types are in it (i.e. exclude them if they are there) | |
4338 | * AND do this only if there is at least one asnum > 65535 in the | |
4339 | * path! | |
4340 | * - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and | |
4341 | * change | |
4342 | * all ASnums > 65535 to BGP_AS_TRANS | |
4343 | */ | |
4344 | ||
4345 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4346 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4347 | aspath_sizep = stream_get_endp(s); | |
4348 | stream_putw(s, 0); | |
4349 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, use32bit)); | |
4350 | ||
4351 | /* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs | |
4352 | * in the path | |
4353 | */ | |
4354 | if (!use32bit && aspath_has_as4(aspath)) | |
4355 | send_as4_path = | |
4356 | 1; /* we'll do this later, at the correct place */ | |
4357 | ||
4358 | /* Nexthop attribute. */ | |
4359 | if (afi == AFI_IP && safi == SAFI_UNICAST | |
4360 | && !peer_cap_enhe(peer, afi, safi)) { | |
b96306f0 DS |
4361 | afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len); |
4362 | ||
d62a17ae | 4363 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) { |
4364 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4365 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4366 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4367 | attr); | |
4368 | stream_putc(s, 4); | |
4369 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
b96306f0 DS |
4370 | } else if (peer_cap_enhe(from, afi, safi) |
4371 | || (nh_afi == AFI_IP6)) { | |
d62a17ae | 4372 | /* |
4373 | * Likely this is the case when an IPv4 prefix was | |
b96306f0 DS |
4374 | * received with Extended Next-hop capability in this |
4375 | * or another vrf and is now being advertised to | |
4376 | * non-ENHE peers. Since peer_cap_enhe only checks | |
4377 | * peers in this vrf, also check the nh_afi to catch | |
4378 | * the case where the originator was in another vrf. | |
d62a17ae | 4379 | * Setting the mandatory (ipv4) next-hop attribute here |
b96306f0 DS |
4380 | * to enable implicit next-hop self with correct A-F |
4381 | * (ipv4 address family). | |
d62a17ae | 4382 | */ |
4383 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4384 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4385 | bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, | |
4386 | NULL); | |
4387 | stream_putc(s, 4); | |
4388 | stream_put_ipv4(s, 0); | |
4389 | } | |
718e3744 | 4390 | } |
d62a17ae | 4391 | |
4392 | /* MED attribute. */ | |
4393 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC) | |
4394 | || bgp->maxmed_active) { | |
4395 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4396 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4397 | stream_putc(s, 4); | |
4398 | stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value | |
4399 | : attr->med)); | |
4400 | } | |
4401 | ||
4402 | /* Local preference. */ | |
4403 | if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) { | |
4404 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4405 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4406 | stream_putc(s, 4); | |
4407 | stream_putl(s, attr->local_pref); | |
4408 | } | |
4409 | ||
4410 | /* Atomic aggregate. */ | |
4411 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4412 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4413 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4414 | stream_putc(s, 0); | |
4415 | } | |
4416 | ||
4417 | /* Aggregator. */ | |
4418 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4419 | /* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */ | |
4420 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4421 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4422 | ||
4423 | if (use32bit) { | |
4424 | /* AS4 capable peer */ | |
4425 | stream_putc(s, 8); | |
4426 | stream_putl(s, attr->aggregator_as); | |
4427 | } else { | |
4428 | /* 2-byte AS peer */ | |
4429 | stream_putc(s, 6); | |
4430 | ||
4431 | /* Is ASN representable in 2-bytes? Or must AS_TRANS be | |
4432 | * used? */ | |
48e1932b | 4433 | if (attr->aggregator_as > UINT16_MAX) { |
d62a17ae | 4434 | stream_putw(s, BGP_AS_TRANS); |
4435 | ||
4436 | /* we have to send AS4_AGGREGATOR, too. | |
4437 | * we'll do that later in order to send | |
4438 | * attributes in ascending | |
4439 | * order. | |
4440 | */ | |
4441 | send_as4_aggregator = 1; | |
4442 | } else | |
d7c0a89a | 4443 | stream_putw(s, (uint16_t)attr->aggregator_as); |
d62a17ae | 4444 | } |
4445 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4446 | } | |
4447 | ||
4448 | /* Community attribute. */ | |
4449 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY) | |
4450 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES))) { | |
9a706b42 DA |
4451 | struct community *comm = NULL; |
4452 | ||
4453 | comm = bgp_attr_get_community(attr); | |
4454 | if (comm->size * 4 > 255) { | |
996c9314 LB |
4455 | stream_putc(s, |
4456 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4457 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4458 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4459 | stream_putw(s, comm->size * 4); |
d62a17ae | 4460 | } else { |
996c9314 LB |
4461 | stream_putc(s, |
4462 | BGP_ATTR_FLAG_OPTIONAL | |
4463 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4464 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4465 | stream_putc(s, comm->size * 4); |
4372df71 | 4466 | } |
9a706b42 | 4467 | stream_put(s, comm->val, comm->size * 4); |
d62a17ae | 4468 | } |
4469 | ||
4470 | /* | |
4471 | * Large Community attribute. | |
4472 | */ | |
4473 | if (CHECK_FLAG(peer->af_flags[afi][safi], | |
4474 | PEER_FLAG_SEND_LARGE_COMMUNITY) | |
4475 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) { | |
1bcf3a96 | 4476 | if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) { |
996c9314 LB |
4477 | stream_putc(s, |
4478 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4479 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4480 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4481 | stream_putw(s, |
4482 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4483 | } else { |
996c9314 LB |
4484 | stream_putc(s, |
4485 | BGP_ATTR_FLAG_OPTIONAL | |
4486 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4487 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4488 | stream_putc(s, |
4489 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
4372df71 | 4490 | } |
1bcf3a96 DA |
4491 | stream_put(s, bgp_attr_get_lcommunity(attr)->val, |
4492 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4493 | } |
4372df71 | 4494 | |
d62a17ae | 4495 | /* Route Reflector. */ |
4496 | if (peer->sort == BGP_PEER_IBGP && from | |
4497 | && from->sort == BGP_PEER_IBGP) { | |
779fee93 DS |
4498 | struct cluster_list *cluster = bgp_attr_get_cluster(attr); |
4499 | ||
d62a17ae | 4500 | /* Originator ID. */ |
4501 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4502 | stream_putc(s, BGP_ATTR_ORIGINATOR_ID); | |
4503 | stream_putc(s, 4); | |
4504 | ||
4505 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID)) | |
4506 | stream_put_in_addr(s, &attr->originator_id); | |
4507 | else | |
4508 | stream_put_in_addr(s, &from->remote_id); | |
4509 | ||
4510 | /* Cluster list. */ | |
4511 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4512 | stream_putc(s, BGP_ATTR_CLUSTER_LIST); | |
4513 | ||
779fee93 DS |
4514 | if (cluster) { |
4515 | stream_putc(s, cluster->length + 4); | |
d62a17ae | 4516 | /* If this peer configuration's parent BGP has |
4517 | * cluster_id. */ | |
4518 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4519 | stream_put_in_addr(s, &bgp->cluster_id); | |
4520 | else | |
4521 | stream_put_in_addr(s, &bgp->router_id); | |
779fee93 | 4522 | stream_put(s, cluster->list, cluster->length); |
d62a17ae | 4523 | } else { |
4524 | stream_putc(s, 4); | |
4525 | /* If this peer configuration's parent BGP has | |
4526 | * cluster_id. */ | |
4527 | if (bgp->config & BGP_CONFIG_CLUSTER_ID) | |
4528 | stream_put_in_addr(s, &bgp->cluster_id); | |
4529 | else | |
4530 | stream_put_in_addr(s, &bgp->router_id); | |
4531 | } | |
4532 | } | |
4372df71 | 4533 | |
d62a17ae | 4534 | /* Extended Communities attribute. */ |
4535 | if (CHECK_FLAG(peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY) | |
4536 | && (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES))) { | |
b53e67a3 | 4537 | struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr); |
b17d5444 DA |
4538 | bool transparent = CHECK_FLAG(peer->af_flags[afi][safi], |
4539 | PEER_FLAG_RSERVER_CLIENT) && | |
4540 | from && | |
4541 | CHECK_FLAG(from->af_flags[afi][safi], | |
4542 | PEER_FLAG_RSERVER_CLIENT); | |
4543 | ||
4544 | if (peer->sort == BGP_PEER_IBGP || | |
4545 | peer->sort == BGP_PEER_CONFED || transparent) { | |
b53e67a3 | 4546 | if (ecomm->size * 8 > 255) { |
996c9314 LB |
4547 | stream_putc(s, |
4548 | BGP_ATTR_FLAG_OPTIONAL | |
4549 | | BGP_ATTR_FLAG_TRANS | |
4550 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4551 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4552 | stream_putw(s, ecomm->size * 8); |
d62a17ae | 4553 | } else { |
996c9314 LB |
4554 | stream_putc(s, |
4555 | BGP_ATTR_FLAG_OPTIONAL | |
4556 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4557 | stream_putc(s, BGP_ATTR_EXT_COMMUNITIES); |
b53e67a3 | 4558 | stream_putc(s, ecomm->size * 8); |
d62a17ae | 4559 | } |
b53e67a3 | 4560 | stream_put(s, ecomm->val, ecomm->size * 8); |
d62a17ae | 4561 | } else { |
d7c0a89a | 4562 | uint8_t *pnt; |
d62a17ae | 4563 | int tbit; |
4564 | int ecom_tr_size = 0; | |
f6e07e1b | 4565 | uint32_t i; |
d62a17ae | 4566 | |
b53e67a3 DA |
4567 | for (i = 0; i < ecomm->size; i++) { |
4568 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4569 | tbit = *pnt; |
4570 | ||
4571 | if (CHECK_FLAG(tbit, | |
4572 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4573 | continue; | |
4574 | ||
4575 | ecom_tr_size++; | |
4576 | } | |
4577 | ||
4578 | if (ecom_tr_size) { | |
4579 | if (ecom_tr_size * 8 > 255) { | |
4580 | stream_putc( | |
4581 | s, | |
4582 | BGP_ATTR_FLAG_OPTIONAL | |
4583 | | BGP_ATTR_FLAG_TRANS | |
4584 | | BGP_ATTR_FLAG_EXTLEN); | |
4585 | stream_putc(s, | |
4586 | BGP_ATTR_EXT_COMMUNITIES); | |
4587 | stream_putw(s, ecom_tr_size * 8); | |
4588 | } else { | |
4589 | stream_putc( | |
4590 | s, | |
4591 | BGP_ATTR_FLAG_OPTIONAL | |
4592 | | BGP_ATTR_FLAG_TRANS); | |
4593 | stream_putc(s, | |
4594 | BGP_ATTR_EXT_COMMUNITIES); | |
4595 | stream_putc(s, ecom_tr_size * 8); | |
4596 | } | |
4597 | ||
b53e67a3 DA |
4598 | for (i = 0; i < ecomm->size; i++) { |
4599 | pnt = ecomm->val + (i * 8); | |
d62a17ae | 4600 | tbit = *pnt; |
4601 | ||
4602 | if (CHECK_FLAG( | |
4603 | tbit, | |
4604 | ECOMMUNITY_FLAG_NON_TRANSITIVE)) | |
4605 | continue; | |
4606 | ||
4607 | stream_put(s, pnt, 8); | |
4608 | } | |
4609 | } | |
4610 | } | |
4611 | } | |
4372df71 | 4612 | |
d62a17ae | 4613 | /* Label index attribute. */ |
4614 | if (safi == SAFI_LABELED_UNICAST) { | |
4615 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
d7c0a89a | 4616 | uint32_t label_index; |
d62a17ae | 4617 | |
4618 | label_index = attr->label_index; | |
4619 | ||
4620 | if (label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
4621 | stream_putc(s, |
4622 | BGP_ATTR_FLAG_OPTIONAL | |
4623 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4624 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
4625 | stream_putc(s, 10); | |
4626 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
4627 | stream_putw(s, | |
4628 | BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
4629 | stream_putc(s, 0); // reserved | |
4630 | stream_putw(s, 0); // flags | |
4631 | stream_putl(s, label_index); | |
4632 | } | |
4372df71 | 4633 | } |
d62a17ae | 4634 | } |
4635 | ||
e496b420 | 4636 | /* SRv6 Service Information Attribute. */ |
dbcf19b8 | 4637 | if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) { |
e496b420 | 4638 | if (attr->srv6_l3vpn) { |
a3e3b5b0 | 4639 | uint8_t subtlv_len = |
a1a51008 RS |
4640 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH |
4641 | + BGP_ATTR_MIN_LEN | |
4642 | + BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH; | |
4643 | uint8_t tlv_len = subtlv_len + BGP_ATTR_MIN_LEN + 1; | |
4644 | uint8_t attr_len = tlv_len + BGP_ATTR_MIN_LEN; | |
e496b420 HS |
4645 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL |
4646 | | BGP_ATTR_FLAG_TRANS); | |
4647 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
a1a51008 | 4648 | stream_putc(s, attr_len); |
e496b420 | 4649 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE); |
a1a51008 | 4650 | stream_putw(s, tlv_len); |
a3e3b5b0 RS |
4651 | stream_putc(s, 0); /* reserved */ |
4652 | stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO); | |
a1a51008 | 4653 | stream_putw(s, subtlv_len); |
e496b420 HS |
4654 | stream_putc(s, 0); /* reserved */ |
4655 | stream_put(s, &attr->srv6_l3vpn->sid, | |
4656 | sizeof(attr->srv6_l3vpn->sid)); /* sid */ | |
4657 | stream_putc(s, 0); /* sid_flags */ | |
05d99980 CS |
4658 | stream_putw(s, |
4659 | attr->srv6_l3vpn | |
4660 | ->endpoint_behavior); /* endpoint */ | |
e496b420 | 4661 | stream_putc(s, 0); /* reserved */ |
a1a51008 RS |
4662 | stream_putc( |
4663 | s, | |
4664 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE); | |
4665 | stream_putw( | |
4666 | s, | |
4667 | BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH); | |
4668 | stream_putc(s, attr->srv6_l3vpn->loc_block_len); | |
4669 | stream_putc(s, attr->srv6_l3vpn->loc_node_len); | |
4670 | stream_putc(s, attr->srv6_l3vpn->func_len); | |
4671 | stream_putc(s, attr->srv6_l3vpn->arg_len); | |
4672 | stream_putc(s, attr->srv6_l3vpn->transposition_len); | |
4673 | stream_putc(s, attr->srv6_l3vpn->transposition_offset); | |
e496b420 HS |
4674 | } else if (attr->srv6_vpn) { |
4675 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | |
4676 | | BGP_ATTR_FLAG_TRANS); | |
4677 | stream_putc(s, BGP_ATTR_PREFIX_SID); | |
4678 | stream_putc(s, 22); /* tlv len */ | |
4679 | stream_putc(s, BGP_PREFIX_SID_VPN_SID); | |
4680 | stream_putw(s, 0x13); /* tlv len */ | |
4681 | stream_putc(s, 0x00); /* reserved */ | |
4682 | stream_putc(s, 0x01); /* sid_type */ | |
4683 | stream_putc(s, 0x00); /* sif_flags */ | |
4684 | stream_put(s, &attr->srv6_vpn->sid, | |
4685 | sizeof(attr->srv6_vpn->sid)); /* sid */ | |
4686 | } | |
4687 | } | |
4688 | ||
d62a17ae | 4689 | if (send_as4_path) { |
4690 | /* If the peer is NOT As4 capable, AND */ | |
4691 | /* there are ASnums > 65535 in path THEN | |
4692 | * give out AS4_PATH */ | |
4693 | ||
4694 | /* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET | |
4695 | * path segments! | |
4696 | * Hm, I wonder... confederation things *should* only be at | |
4697 | * the beginning of an aspath, right? Then we should use | |
4698 | * aspath_delete_confed_seq for this, because it is already | |
4699 | * there! (JK) | |
4700 | * Folks, talk to me: what is reasonable here!? | |
4701 | */ | |
4702 | aspath = aspath_delete_confed_seq(aspath); | |
4703 | ||
996c9314 LB |
4704 | stream_putc(s, |
4705 | BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL | |
4706 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4707 | stream_putc(s, BGP_ATTR_AS4_PATH); |
4708 | aspath_sizep = stream_get_endp(s); | |
4709 | stream_putw(s, 0); | |
4710 | stream_putw_at(s, aspath_sizep, aspath_put(s, aspath, 1)); | |
4711 | } | |
4712 | ||
4713 | if (aspath != attr->aspath) | |
4714 | aspath_free(aspath); | |
4715 | ||
4716 | if (send_as4_aggregator) { | |
4717 | /* send AS4_AGGREGATOR, at this place */ | |
4718 | /* this section of code moved here in order to ensure the | |
4719 | * correct | |
4720 | * *ascending* order of attributes | |
4721 | */ | |
4722 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4723 | stream_putc(s, BGP_ATTR_AS4_AGGREGATOR); | |
4724 | stream_putc(s, 8); | |
4725 | stream_putl(s, attr->aggregator_as); | |
4726 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4727 | } | |
4728 | ||
4729 | if (((afi == AFI_IP || afi == AFI_IP6) | |
4730 | && (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) | |
4731 | || (afi == AFI_L2VPN && safi == SAFI_EVPN)) { | |
4732 | /* Tunnel Encap attribute */ | |
4733 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP); | |
65efcfce | 4734 | |
1e20238a | 4735 | #ifdef ENABLE_BGP_VNC_ATTR |
d62a17ae | 4736 | /* VNC attribute */ |
4737 | bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC); | |
65efcfce | 4738 | #endif |
d62a17ae | 4739 | } |
587ff0fd | 4740 | |
a21bd7a3 DW |
4741 | /* PMSI Tunnel */ |
4742 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) { | |
4743 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4744 | stream_putc(s, BGP_ATTR_PMSI_TUNNEL); | |
4745 | stream_putc(s, 9); // Length | |
4746 | stream_putc(s, 0); // Flags | |
2a3f51cf | 4747 | stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr)); |
996c9314 LB |
4748 | stream_put(s, &(attr->label), |
4749 | BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI | |
30d85a30 LB |
4750 | stream_put_ipv4(s, attr->nexthop.s_addr); |
4751 | // Unicast tunnel endpoint IP address | |
a21bd7a3 DW |
4752 | } |
4753 | ||
d864dd9e EB |
4754 | /* OTC */ |
4755 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_OTC)) { | |
4756 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4757 | stream_putc(s, BGP_ATTR_OTC); | |
4758 | stream_putc(s, 4); | |
4759 | stream_putl(s, attr->otc); | |
4760 | } | |
4761 | ||
97a52c82 | 4762 | /* AIGP */ |
af9aee79 | 4763 | if (bpi && attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AIGP) && |
97a52c82 DA |
4764 | (CHECK_FLAG(peer->flags, PEER_FLAG_AIGP) || |
4765 | peer->sort != BGP_PEER_EBGP)) { | |
4766 | /* At the moment only AIGP Metric TLV exists for AIGP | |
4767 | * attribute. If more comes in, do not forget to update | |
4768 | * attr_len variable to include new ones. | |
4769 | */ | |
4770 | uint8_t attr_len = BGP_AIGP_TLV_METRIC_LEN; | |
4771 | ||
4772 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4773 | stream_putc(s, BGP_ATTR_AIGP); | |
4774 | stream_putc(s, attr_len); | |
4775 | stream_put_bgp_aigp_tlv_metric(s, bpi); | |
4776 | } | |
4777 | ||
d62a17ae | 4778 | /* Unknown transit attribute. */ |
04fb21e2 DS |
4779 | struct transit *transit = bgp_attr_get_transit(attr); |
4780 | ||
4781 | if (transit) | |
4782 | stream_put(s, transit->val, transit->length); | |
718e3744 | 4783 | |
d62a17ae | 4784 | /* Return total size of attribute. */ |
4785 | return stream_get_endp(s) - cp; | |
718e3744 | 4786 | } |
4787 | ||
d62a17ae | 4788 | size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi) |
718e3744 | 4789 | { |
d62a17ae | 4790 | unsigned long attrlen_pnt; |
617975d1 DS |
4791 | iana_afi_t pkt_afi = IANA_AFI_IPV4; |
4792 | iana_safi_t pkt_safi = IANA_SAFI_UNICAST; | |
718e3744 | 4793 | |
d62a17ae | 4794 | /* Set extended bit always to encode the attribute length as 2 bytes */ |
4795 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN); | |
4796 | stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI); | |
718e3744 | 4797 | |
d62a17ae | 4798 | attrlen_pnt = stream_get_endp(s); |
4799 | stream_putw(s, 0); /* Length of this attribute. */ | |
718e3744 | 4800 | |
d62a17ae | 4801 | /* Convert AFI, SAFI to values for packet. */ |
4802 | bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi); | |
9cabb64b | 4803 | |
d62a17ae | 4804 | stream_putw(s, pkt_afi); |
4805 | stream_putc(s, pkt_safi); | |
9cabb64b | 4806 | |
d62a17ae | 4807 | return attrlen_pnt; |
8c71e481 | 4808 | } |
718e3744 | 4809 | |
5f040085 DS |
4810 | void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p, |
4811 | afi_t afi, safi_t safi, | |
4812 | const struct prefix_rd *prd, | |
d7c0a89a | 4813 | mpls_label_t *label, uint32_t num_labels, |
be92fc9f | 4814 | bool addpath_capable, uint32_t addpath_tx_id, |
b57ba6d2 | 4815 | struct attr *attr) |
8c71e481 | 4816 | { |
d87c526b | 4817 | uint8_t wlabel[4] = {0x80, 0x00, 0x00}; |
cd1964ff | 4818 | |
b57ba6d2 | 4819 | if (safi == SAFI_LABELED_UNICAST) { |
d62a17ae | 4820 | label = (mpls_label_t *)wlabel; |
b57ba6d2 MK |
4821 | num_labels = 1; |
4822 | } | |
cd1964ff | 4823 | |
d90b788e | 4824 | bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels, |
be92fc9f | 4825 | addpath_capable, addpath_tx_id, attr); |
8c71e481 | 4826 | } |
718e3744 | 4827 | |
d62a17ae | 4828 | void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt) |
8c71e481 | 4829 | { |
d62a17ae | 4830 | bgp_packet_mpattr_end(s, attrlen_pnt); |
718e3744 | 4831 | } |
4832 | ||
4833 | /* Initialization of attribute. */ | |
d62a17ae | 4834 | void bgp_attr_init(void) |
718e3744 | 4835 | { |
d62a17ae | 4836 | aspath_init(); |
4837 | attrhash_init(); | |
4838 | community_init(); | |
4839 | ecommunity_init(); | |
4840 | lcommunity_init(); | |
4841 | cluster_init(); | |
4842 | transit_init(); | |
4843 | encap_init(); | |
e496b420 | 4844 | srv6_init(); |
718e3744 | 4845 | } |
4846 | ||
d62a17ae | 4847 | void bgp_attr_finish(void) |
228da428 | 4848 | { |
d62a17ae | 4849 | aspath_finish(); |
4850 | attrhash_finish(); | |
4851 | community_finish(); | |
4852 | ecommunity_finish(); | |
4853 | lcommunity_finish(); | |
4854 | cluster_finish(); | |
4855 | transit_finish(); | |
4856 | encap_finish(); | |
e496b420 | 4857 | srv6_finish(); |
228da428 CC |
4858 | } |
4859 | ||
718e3744 | 4860 | /* Make attribute packet. */ |
97a52c82 | 4861 | void bgp_dump_routes_attr(struct stream *s, struct bgp_path_info *bpi, |
bd494ec5 | 4862 | const struct prefix *prefix) |
d62a17ae | 4863 | { |
4864 | unsigned long cp; | |
4865 | unsigned long len; | |
4866 | size_t aspath_lenp; | |
4867 | struct aspath *aspath; | |
be92fc9f | 4868 | bool addpath_capable = false; |
d7c0a89a | 4869 | uint32_t addpath_tx_id = 0; |
97a52c82 | 4870 | struct attr *attr = bpi->attr; |
d62a17ae | 4871 | |
4872 | /* Remember current pointer. */ | |
4873 | cp = stream_get_endp(s); | |
4874 | ||
4875 | /* Place holder of length. */ | |
4876 | stream_putw(s, 0); | |
4877 | ||
4878 | /* Origin attribute. */ | |
4879 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4880 | stream_putc(s, BGP_ATTR_ORIGIN); | |
4881 | stream_putc(s, 1); | |
4882 | stream_putc(s, attr->origin); | |
4883 | ||
4884 | aspath = attr->aspath; | |
4885 | ||
4886 | stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_EXTLEN); | |
4887 | stream_putc(s, BGP_ATTR_AS_PATH); | |
4888 | aspath_lenp = stream_get_endp(s); | |
4889 | stream_putw(s, 0); | |
4890 | ||
4891 | stream_putw_at(s, aspath_lenp, aspath_put(s, aspath, 1)); | |
4892 | ||
4893 | /* Nexthop attribute. */ | |
4894 | /* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */ | |
4895 | if (prefix != NULL && prefix->family != AF_INET6) { | |
4896 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4897 | stream_putc(s, BGP_ATTR_NEXT_HOP); | |
4898 | stream_putc(s, 4); | |
4899 | stream_put_ipv4(s, attr->nexthop.s_addr); | |
718e3744 | 4900 | } |
d62a17ae | 4901 | |
4902 | /* MED attribute. */ | |
4903 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)) { | |
4904 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4905 | stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC); | |
4906 | stream_putc(s, 4); | |
4907 | stream_putl(s, attr->med); | |
4908 | } | |
4909 | ||
4910 | /* Local preference. */ | |
4911 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) { | |
4912 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4913 | stream_putc(s, BGP_ATTR_LOCAL_PREF); | |
4914 | stream_putc(s, 4); | |
4915 | stream_putl(s, attr->local_pref); | |
4916 | } | |
4917 | ||
4918 | /* Atomic aggregate. */ | |
4919 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE)) { | |
4920 | stream_putc(s, BGP_ATTR_FLAG_TRANS); | |
4921 | stream_putc(s, BGP_ATTR_ATOMIC_AGGREGATE); | |
4922 | stream_putc(s, 0); | |
4923 | } | |
4924 | ||
4925 | /* Aggregator. */ | |
4926 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR)) { | |
4927 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
4928 | stream_putc(s, BGP_ATTR_AGGREGATOR); | |
4929 | stream_putc(s, 8); | |
4930 | stream_putl(s, attr->aggregator_as); | |
4931 | stream_put_ipv4(s, attr->aggregator_addr.s_addr); | |
4932 | } | |
4933 | ||
4934 | /* Community attribute. */ | |
4935 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) { | |
9a706b42 DA |
4936 | struct community *comm = NULL; |
4937 | ||
4938 | comm = bgp_attr_get_community(attr); | |
4939 | if (comm->size * 4 > 255) { | |
996c9314 LB |
4940 | stream_putc(s, |
4941 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4942 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4943 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4944 | stream_putw(s, comm->size * 4); |
d62a17ae | 4945 | } else { |
996c9314 LB |
4946 | stream_putc(s, |
4947 | BGP_ATTR_FLAG_OPTIONAL | |
4948 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4949 | stream_putc(s, BGP_ATTR_COMMUNITIES); |
9a706b42 | 4950 | stream_putc(s, comm->size * 4); |
d62a17ae | 4951 | } |
9a706b42 | 4952 | stream_put(s, comm->val, comm->size * 4); |
d62a17ae | 4953 | } |
4954 | ||
4955 | /* Large Community attribute. */ | |
4956 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) { | |
1bcf3a96 | 4957 | if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) { |
996c9314 LB |
4958 | stream_putc(s, |
4959 | BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS | |
4960 | | BGP_ATTR_FLAG_EXTLEN); | |
d62a17ae | 4961 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4962 | stream_putw(s, |
4963 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4964 | } else { |
996c9314 LB |
4965 | stream_putc(s, |
4966 | BGP_ATTR_FLAG_OPTIONAL | |
4967 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 4968 | stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES); |
1bcf3a96 DA |
4969 | stream_putc(s, |
4970 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4971 | } |
4972 | ||
1bcf3a96 DA |
4973 | stream_put(s, bgp_attr_get_lcommunity(attr)->val, |
4974 | lcom_length(bgp_attr_get_lcommunity(attr))); | |
d62a17ae | 4975 | } |
4976 | ||
4977 | /* Add a MP_NLRI attribute to dump the IPv6 next hop */ | |
4978 | if (prefix != NULL && prefix->family == AF_INET6 | |
4979 | && (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL | |
4980 | || attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) { | |
4981 | int sizep; | |
4982 | ||
4983 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL); | |
4984 | stream_putc(s, BGP_ATTR_MP_REACH_NLRI); | |
4985 | sizep = stream_get_endp(s); | |
4986 | ||
4987 | /* MP header */ | |
4988 | stream_putc(s, 0); /* Marker: Attribute length. */ | |
4989 | stream_putw(s, AFI_IP6); /* AFI */ | |
4990 | stream_putc(s, SAFI_UNICAST); /* SAFI */ | |
4991 | ||
4992 | /* Next hop */ | |
4993 | stream_putc(s, attr->mp_nexthop_len); | |
4994 | stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN); | |
4995 | if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) | |
4996 | stream_put(s, &attr->mp_nexthop_local, | |
4997 | IPV6_MAX_BYTELEN); | |
4998 | ||
4999 | /* SNPA */ | |
5000 | stream_putc(s, 0); | |
5001 | ||
5002 | /* Prefix */ | |
be92fc9f | 5003 | stream_put_prefix_addpath(s, prefix, addpath_capable, |
d62a17ae | 5004 | addpath_tx_id); |
5005 | ||
5006 | /* Set MP attribute length. */ | |
5007 | stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1); | |
5008 | } | |
5009 | ||
5010 | /* Prefix SID */ | |
5011 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) { | |
5012 | if (attr->label_index != BGP_INVALID_LABEL_INDEX) { | |
996c9314 LB |
5013 | stream_putc(s, |
5014 | BGP_ATTR_FLAG_OPTIONAL | |
5015 | | BGP_ATTR_FLAG_TRANS); | |
d62a17ae | 5016 | stream_putc(s, BGP_ATTR_PREFIX_SID); |
5017 | stream_putc(s, 10); | |
5018 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX); | |
5019 | stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH); | |
5020 | stream_putc(s, 0); // reserved | |
5021 | stream_putw(s, 0); // flags | |
5022 | stream_putl(s, attr->label_index); | |
5023 | } | |
5024 | } | |
5025 | ||
d864dd9e EB |
5026 | /* OTC */ |
5027 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_OTC)) { | |
5028 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
5029 | stream_putc(s, BGP_ATTR_OTC); | |
5030 | stream_putc(s, 4); | |
5031 | stream_putl(s, attr->otc); | |
5032 | } | |
5033 | ||
97a52c82 DA |
5034 | /* AIGP */ |
5035 | if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_AIGP)) { | |
5036 | /* At the moment only AIGP Metric TLV exists for AIGP | |
5037 | * attribute. If more comes in, do not forget to update | |
5038 | * attr_len variable to include new ones. | |
5039 | */ | |
5040 | uint8_t attr_len = BGP_AIGP_TLV_METRIC_LEN; | |
5041 | ||
5042 | stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS); | |
5043 | stream_putc(s, BGP_ATTR_AIGP); | |
5044 | stream_putc(s, attr_len); | |
5045 | stream_put_bgp_aigp_tlv_metric(s, bpi); | |
5046 | } | |
5047 | ||
d62a17ae | 5048 | /* Return total size of attribute. */ |
5049 | len = stream_get_endp(s) - cp - 2; | |
5050 | stream_putw_at(s, cp, len); | |
718e3744 | 5051 | } |
a5c6a9b1 DA |
5052 | |
5053 | void bgp_path_attribute_discard_vty(struct vty *vty, struct peer *peer, | |
b986d7f4 | 5054 | const char *discard_attrs, bool set) |
a5c6a9b1 DA |
5055 | { |
5056 | int i, num_attributes; | |
5057 | char **attributes; | |
5058 | afi_t afi; | |
5059 | safi_t safi; | |
5060 | ||
a5c6a9b1 | 5061 | |
b986d7f4 DA |
5062 | /* If `no` command specified without arbitrary attributes, |
5063 | * then flush all. | |
5064 | */ | |
5065 | if (!discard_attrs) { | |
a5c6a9b1 DA |
5066 | for (i = 0; i < BGP_ATTR_MAX; i++) |
5067 | peer->discard_attrs[i] = false; | |
b986d7f4 DA |
5068 | goto discard_soft_clear; |
5069 | } | |
5070 | ||
5071 | if (discard_attrs) { | |
5072 | frrstr_split(discard_attrs, " ", &attributes, &num_attributes); | |
5073 | ||
5074 | if (set) | |
5075 | for (i = 0; i < BGP_ATTR_MAX; i++) | |
5076 | peer->discard_attrs[i] = false; | |
a5c6a9b1 DA |
5077 | |
5078 | for (i = 0; i < num_attributes; i++) { | |
5079 | uint8_t attr_num = strtoul(attributes[i], NULL, 10); | |
5080 | ||
5081 | XFREE(MTYPE_TMP, attributes[i]); | |
5082 | ||
5083 | /* Some of the attributes, just can't be ignored. */ | |
5084 | if (attr_num == BGP_ATTR_ORIGIN || | |
5085 | attr_num == BGP_ATTR_AS_PATH || | |
5086 | attr_num == BGP_ATTR_NEXT_HOP || | |
5087 | attr_num == BGP_ATTR_MULTI_EXIT_DISC || | |
5088 | attr_num == BGP_ATTR_MP_REACH_NLRI || | |
5089 | attr_num == BGP_ATTR_MP_UNREACH_NLRI || | |
5090 | attr_num == BGP_ATTR_EXT_COMMUNITIES) { | |
5091 | vty_out(vty, | |
5092 | "%% Can't discard path-attribute %s, ignoring.\n", | |
5093 | lookup_msg(attr_str, attr_num, NULL)); | |
5094 | continue; | |
5095 | } | |
5096 | ||
5097 | /* Ignore local-pref, originator-id, cluster-list only | |
5098 | * for eBGP. | |
5099 | */ | |
5100 | if (peer->sort != BGP_PEER_EBGP && | |
5101 | (attr_num == BGP_ATTR_LOCAL_PREF || | |
5102 | attr_num == BGP_ATTR_ORIGINATOR_ID || | |
5103 | attr_num == BGP_ATTR_CLUSTER_LIST)) { | |
5104 | vty_out(vty, | |
5105 | "%% Can discard path-attribute %s only for eBGP, ignoring.\n", | |
5106 | lookup_msg(attr_str, attr_num, NULL)); | |
5107 | continue; | |
5108 | } | |
5109 | ||
b986d7f4 | 5110 | peer->discard_attrs[attr_num] = set; |
a5c6a9b1 DA |
5111 | } |
5112 | XFREE(MTYPE_TMP, attributes); | |
b986d7f4 | 5113 | discard_soft_clear: |
a5c6a9b1 DA |
5114 | /* Configuring path attributes to be discarded will trigger |
5115 | * an inbound Route Refresh to ensure that the routing table | |
5116 | * is up to date. | |
5117 | */ | |
5118 | FOREACH_AFI_SAFI (afi, safi) | |
5119 | peer_clear_soft(peer, afi, safi, BGP_CLEAR_SOFT_IN); | |
5120 | } | |
5121 | } | |
e2863b4f DA |
5122 | |
5123 | void bgp_path_attribute_withdraw_vty(struct vty *vty, struct peer *peer, | |
5124 | const char *withdraw_attrs, bool set) | |
5125 | { | |
5126 | int i, num_attributes; | |
5127 | char **attributes; | |
5128 | afi_t afi; | |
5129 | safi_t safi; | |
5130 | ||
5131 | /* If `no` command specified without arbitrary attributes, | |
5132 | * then flush all. | |
5133 | */ | |
5134 | if (!withdraw_attrs) { | |
5135 | for (i = 0; i < BGP_ATTR_MAX; i++) | |
5136 | peer->withdraw_attrs[i] = false; | |
5137 | goto withdraw_soft_clear; | |
5138 | } | |
5139 | ||
5140 | if (withdraw_attrs) { | |
5141 | frrstr_split(withdraw_attrs, " ", &attributes, &num_attributes); | |
5142 | ||
5143 | if (set) | |
5144 | for (i = 0; i < BGP_ATTR_MAX; i++) | |
5145 | peer->withdraw_attrs[i] = false; | |
5146 | ||
5147 | for (i = 0; i < num_attributes; i++) { | |
5148 | uint8_t attr_num = strtoul(attributes[i], NULL, 10); | |
5149 | ||
5150 | XFREE(MTYPE_TMP, attributes[i]); | |
5151 | ||
5152 | /* Some of the attributes, just can't be ignored. */ | |
5153 | if (attr_num == BGP_ATTR_ORIGIN || | |
5154 | attr_num == BGP_ATTR_AS_PATH || | |
5155 | attr_num == BGP_ATTR_NEXT_HOP || | |
5156 | attr_num == BGP_ATTR_MULTI_EXIT_DISC || | |
5157 | attr_num == BGP_ATTR_MP_REACH_NLRI || | |
5158 | attr_num == BGP_ATTR_MP_UNREACH_NLRI || | |
5159 | attr_num == BGP_ATTR_EXT_COMMUNITIES) { | |
5160 | vty_out(vty, | |
5161 | "%% Can't treat-as-withdraw path-attribute %s, ignoring.\n", | |
5162 | lookup_msg(attr_str, attr_num, NULL)); | |
5163 | continue; | |
5164 | } | |
5165 | ||
5166 | /* Ignore local-pref, originator-id, cluster-list only | |
5167 | * for eBGP. | |
5168 | */ | |
5169 | if (peer->sort != BGP_PEER_EBGP && | |
5170 | (attr_num == BGP_ATTR_LOCAL_PREF || | |
5171 | attr_num == BGP_ATTR_ORIGINATOR_ID || | |
5172 | attr_num == BGP_ATTR_CLUSTER_LIST)) { | |
5173 | vty_out(vty, | |
5174 | "%% Can treat-as-withdraw path-attribute %s only for eBGP, ignoring.\n", | |
5175 | lookup_msg(attr_str, attr_num, NULL)); | |
5176 | continue; | |
5177 | } | |
5178 | ||
5179 | peer->withdraw_attrs[attr_num] = set; | |
5180 | } | |
5181 | XFREE(MTYPE_TMP, attributes); | |
5182 | withdraw_soft_clear: | |
5183 | /* Configuring path attributes to be treated as withdraw will | |
5184 | * trigger | |
5185 | * an inbound Route Refresh to ensure that the routing table | |
5186 | * is up to date. | |
5187 | */ | |
5188 | FOREACH_AFI_SAFI (afi, safi) | |
5189 | peer_clear_soft(peer, afi, safi, BGP_CLEAR_SOFT_IN); | |
5190 | } | |
5191 | } | |
5192 | ||
5193 | enum bgp_attr_parse_ret bgp_attr_ignore(struct peer *peer, uint8_t type) | |
5194 | { | |
5195 | bool discard = peer->discard_attrs[type]; | |
5196 | bool withdraw = peer->withdraw_attrs[type]; | |
5197 | ||
5198 | if (bgp_debug_update(peer, NULL, NULL, 1) && (discard || withdraw)) | |
5199 | zlog_debug("%pBP: Ignoring attribute %s (%s)", peer, | |
5200 | lookup_msg(attr_str, type, NULL), | |
5201 | withdraw ? "treat-as-withdraw" : "discard"); | |
5202 | ||
5203 | return withdraw ? BGP_ATTR_PARSE_WITHDRAW : BGP_ATTR_PARSE_PROCEED; | |
5204 | } |