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d62a17ae | 1 | /* BGP attributes. |
896014f4 DL |
2 | * Copyright (C) 1996, 97, 98 Kunihiro Ishiguro |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
00d252cb | 21 | #ifndef _QUAGGA_BGP_ATTR_H |
22 | #define _QUAGGA_BGP_ATTR_H | |
23 | ||
9bedbb1e | 24 | #include "mpls.h" |
684a7227 PG |
25 | #include "bgp_attr_evpn.h" |
26 | ||
718e3744 | 27 | /* Simple bit mapping. */ |
28 | #define BITMAP_NBBY 8 | |
29 | ||
d62a17ae | 30 | #define SET_BITMAP(MAP, NUM) \ |
31 | SET_FLAG(MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY)) | |
718e3744 | 32 | |
d62a17ae | 33 | #define CHECK_BITMAP(MAP, NUM) \ |
34 | CHECK_FLAG(MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY)) | |
718e3744 | 35 | |
3b424979 | 36 | #define BGP_MED_MAX UINT32_MAX |
37 | ||
718e3744 | 38 | /* BGP Attribute type range. */ |
39 | #define BGP_ATTR_TYPE_RANGE 256 | |
40 | #define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY) | |
41 | ||
42 | /* BGP Attribute flags. */ | |
43 | #define BGP_ATTR_FLAG_OPTIONAL 0x80 /* Attribute is optional. */ | |
44 | #define BGP_ATTR_FLAG_TRANS 0x40 /* Attribute is transitive. */ | |
45 | #define BGP_ATTR_FLAG_PARTIAL 0x20 /* Attribute is partial. */ | |
46 | #define BGP_ATTR_FLAG_EXTLEN 0x10 /* Extended length flag. */ | |
47 | ||
48 | /* BGP attribute header must bigger than 2. */ | |
370b64a2 | 49 | #define BGP_ATTR_MIN_LEN 3 /* Attribute flag, type length. */ |
03e214c8 PJ |
50 | #define BGP_ATTR_DEFAULT_WEIGHT 32768 |
51 | ||
801a9bcc DS |
52 | /* Valid lengths for mp_nexthop_len */ |
53 | #define BGP_ATTR_NHLEN_IPV4 IPV4_MAX_BYTELEN | |
945c8fe9 | 54 | #define BGP_ATTR_NHLEN_VPNV4 8+IPV4_MAX_BYTELEN |
801a9bcc DS |
55 | #define BGP_ATTR_NHLEN_IPV6_GLOBAL IPV6_MAX_BYTELEN |
56 | #define BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL (IPV6_MAX_BYTELEN * 2) | |
945c8fe9 LB |
57 | #define BGP_ATTR_NHLEN_VPNV6_GLOBAL 8+IPV6_MAX_BYTELEN |
58 | #define BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL ((8+IPV6_MAX_BYTELEN) * 2) | |
801a9bcc | 59 | |
c5a543b4 DW |
60 | /* Prefix SID types */ |
61 | #define BGP_PREFIX_SID_LABEL_INDEX 1 | |
62 | #define BGP_PREFIX_SID_IPV6 2 | |
63 | #define BGP_PREFIX_SID_ORIGINATOR_SRGB 3 | |
64 | ||
65 | #define BGP_PREFIX_SID_LABEL_INDEX_LENGTH 7 | |
66 | #define BGP_PREFIX_SID_IPV6_LENGTH 19 | |
67 | #define BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH 6 | |
f4c89855 | 68 | |
7fd077aa | 69 | /* PMSI tunnel types (RFC 6514) */ |
70 | ||
f4c89855 | 71 | struct bgp_attr_encap_subtlv { |
d62a17ae | 72 | struct bgp_attr_encap_subtlv *next; /* for chaining */ |
73 | /* Reference count of this attribute. */ | |
74 | unsigned long refcnt; | |
75 | uint16_t type; | |
76 | uint16_t length; | |
8c9cc7bb | 77 | uint8_t value[0]; /* will be extended */ |
f4c89855 LB |
78 | }; |
79 | ||
65efcfce LB |
80 | #if ENABLE_BGP_VNC |
81 | /* | |
82 | * old rfp<->rfapi representation | |
83 | */ | |
84 | struct bgp_tea_options { | |
d62a17ae | 85 | struct bgp_tea_options *next; |
86 | uint8_t options_count; | |
87 | uint16_t options_length; /* each TLV may be 256 in length */ | |
88 | uint8_t type; | |
89 | uint8_t length; | |
90 | void *value; /* pointer to data */ | |
65efcfce LB |
91 | }; |
92 | ||
93 | #endif | |
94 | ||
684a7227 | 95 | /* Overlay Index Info */ |
d62a17ae | 96 | struct overlay_index { |
97 | struct eth_segment_id eth_s_id; | |
98 | union gw_addr gw_ip; | |
684a7227 PG |
99 | }; |
100 | ||
7fd077aa | 101 | enum pta_type { |
b7d08f5a | 102 | PMSI_TNLTYPE_NO_INFO = 0, |
7fd077aa | 103 | PMSI_TNLTYPE_RSVP_TE_P2MP, |
104 | PMSI_TNLTYPE_MLDP_P2MP, | |
105 | PMSI_TNLTYPE_PIM_SSM, | |
106 | PMSI_TNLTYPE_PIM_SM, | |
107 | PMSI_TNLTYPE_PIM_BIDIR, | |
108 | PMSI_TNLTYPE_INGR_REPL, | |
109 | PMSI_TNLTYPE_MLDP_MP2MP, | |
110 | PMSI_TNLTYPE_MAX = PMSI_TNLTYPE_MLDP_MP2MP | |
111 | }; | |
112 | ||
aadc0905 | 113 | /* BGP core attribute structure. */ |
d62a17ae | 114 | struct attr { |
115 | /* AS Path structure */ | |
116 | struct aspath *aspath; | |
117 | ||
118 | /* Community structure */ | |
119 | struct community *community; | |
120 | ||
121 | /* Reference count of this attribute. */ | |
122 | unsigned long refcnt; | |
123 | ||
124 | /* Flag of attribute is set or not. */ | |
125 | uint64_t flag; | |
126 | ||
127 | /* Apart from in6_addr, the remaining static attributes */ | |
128 | struct in_addr nexthop; | |
d7c0a89a QY |
129 | uint32_t med; |
130 | uint32_t local_pref; | |
d62a17ae | 131 | ifindex_t nh_ifindex; |
132 | ||
133 | /* Path origin attribute */ | |
d7c0a89a | 134 | uint8_t origin; |
d62a17ae | 135 | |
7fd077aa | 136 | /* PMSI tunnel type (RFC 6514). */ |
137 | enum pta_type pmsi_tnl_type; | |
138 | ||
d62a17ae | 139 | /* has the route-map changed any attribute? |
140 | Used on the peer outbound side. */ | |
d7c0a89a | 141 | uint32_t rmap_change_flags; |
d62a17ae | 142 | |
143 | /* Multi-Protocol Nexthop, AFI IPv6 */ | |
144 | struct in6_addr mp_nexthop_global; | |
145 | struct in6_addr mp_nexthop_local; | |
146 | ||
77e62f2b | 147 | /* ifIndex corresponding to mp_nexthop_local. */ |
148 | ifindex_t nh_lla_ifindex; | |
149 | ||
d62a17ae | 150 | /* Extended Communities attribute. */ |
151 | struct ecommunity *ecommunity; | |
152 | ||
153 | /* Large Communities attribute. */ | |
154 | struct lcommunity *lcommunity; | |
155 | ||
156 | /* Route-Reflector Cluster attribute */ | |
157 | struct cluster_list *cluster; | |
158 | ||
159 | /* Unknown transitive attribute. */ | |
160 | struct transit *transit; | |
161 | ||
162 | struct in_addr mp_nexthop_global_in; | |
163 | ||
164 | /* Aggregator Router ID attribute */ | |
165 | struct in_addr aggregator_addr; | |
166 | ||
167 | /* Route Reflector Originator attribute */ | |
168 | struct in_addr originator_id; | |
169 | ||
170 | /* Local weight, not actually an attribute */ | |
d7c0a89a | 171 | uint32_t weight; |
d62a17ae | 172 | |
173 | /* Aggregator ASN */ | |
174 | as_t aggregator_as; | |
175 | ||
176 | /* MP Nexthop length */ | |
d7c0a89a | 177 | uint8_t mp_nexthop_len; |
d62a17ae | 178 | |
179 | /* MP Nexthop preference */ | |
d7c0a89a | 180 | uint8_t mp_nexthop_prefer_global; |
d62a17ae | 181 | |
182 | /* Static MAC for EVPN */ | |
d7c0a89a | 183 | uint8_t sticky; |
d62a17ae | 184 | |
ead40654 | 185 | /* Flag for default gateway extended community in EVPN */ |
d7c0a89a | 186 | uint8_t default_gw; |
ead40654 | 187 | |
d62a17ae | 188 | /* route tag */ |
189 | route_tag_t tag; | |
190 | ||
191 | /* Label index */ | |
d7c0a89a | 192 | uint32_t label_index; |
d62a17ae | 193 | |
194 | /* MPLS label */ | |
195 | mpls_label_t label; | |
196 | ||
197 | uint16_t encap_tunneltype; /* grr */ | |
198 | struct bgp_attr_encap_subtlv *encap_subtlvs; /* rfc5512 */ | |
65efcfce LB |
199 | |
200 | #if ENABLE_BGP_VNC | |
d62a17ae | 201 | struct bgp_attr_encap_subtlv *vnc_subtlvs; /* VNC-specific */ |
65efcfce | 202 | #endif |
d62a17ae | 203 | /* EVPN */ |
204 | struct overlay_index evpn_overlay; | |
128ea8ab | 205 | |
d62a17ae | 206 | /* EVPN MAC Mobility sequence number, if any. */ |
d7c0a89a | 207 | uint32_t mm_seqnum; |
bc59a672 MK |
208 | |
209 | /* EVPN local router-mac */ | |
210 | struct ethaddr rmac; | |
fb982c25 PJ |
211 | }; |
212 | ||
3f9c7369 | 213 | /* rmap_change_flags definition */ |
3811f1e2 | 214 | #define BATTR_RMAP_IPV4_NHOP_CHANGED (1 << 0) |
3f9c7369 DS |
215 | #define BATTR_RMAP_NEXTHOP_PEER_ADDRESS (1 << 1) |
216 | #define BATTR_REFLECTED (1 << 2) | |
316e074d | 217 | #define BATTR_RMAP_NEXTHOP_UNCHANGED (1 << 3) |
3811f1e2 DS |
218 | #define BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED (1 << 4) |
219 | #define BATTR_RMAP_IPV6_LL_NHOP_CHANGED (1 << 5) | |
b2e03f7a | 220 | #define BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED (1 << 6) |
3f9c7369 | 221 | |
718e3744 | 222 | /* Router Reflector related structure. */ |
d62a17ae | 223 | struct cluster_list { |
224 | unsigned long refcnt; | |
225 | int length; | |
226 | struct in_addr *list; | |
718e3744 | 227 | }; |
228 | ||
229 | /* Unknown transit attribute. */ | |
d62a17ae | 230 | struct transit { |
231 | unsigned long refcnt; | |
232 | int length; | |
d7c0a89a | 233 | uint8_t *val; |
718e3744 | 234 | }; |
235 | ||
96099b40 DL |
236 | /* "(void) 0" will generate a compiler error. this is a safety check to |
237 | * ensure we're not using a value that exceeds the bit size of attr->flag. */ | |
996c9314 LB |
238 | #define ATTR_FLAG_BIT(X) \ |
239 | __builtin_choose_expr((X) >= 1 && (X) <= 64, 1ULL << ((X)-1), (void)0) | |
718e3744 | 240 | |
d62a17ae | 241 | #define BGP_CLUSTER_LIST_LENGTH(attr) \ |
242 | (((attr)->flag & ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)) \ | |
243 | ? (attr)->cluster->length \ | |
244 | : 0) | |
5e242b0d | 245 | |
b881c707 | 246 | typedef enum { |
d62a17ae | 247 | BGP_ATTR_PARSE_PROCEED = 0, |
248 | BGP_ATTR_PARSE_ERROR = -1, | |
249 | BGP_ATTR_PARSE_WITHDRAW = -2, | |
f57000c0 | 250 | |
d62a17ae | 251 | /* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR |
9d303b37 | 252 | */ |
d62a17ae | 253 | BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3, |
9b9df989 | 254 | BGP_ATTR_PARSE_EOR = -4, |
b881c707 PJ |
255 | } bgp_attr_parse_ret_t; |
256 | ||
3f9c7369 DS |
257 | struct bpacket_attr_vec_arr; |
258 | ||
718e3744 | 259 | /* Prototypes. */ |
d62a17ae | 260 | extern void bgp_attr_init(void); |
261 | extern void bgp_attr_finish(void); | |
262 | extern bgp_attr_parse_ret_t bgp_attr_parse(struct peer *, struct attr *, | |
263 | bgp_size_t, struct bgp_nlri *, | |
264 | struct bgp_nlri *); | |
265 | extern void bgp_attr_dup(struct attr *, struct attr *); | |
f46d8e1e | 266 | extern void bgp_attr_undup(struct attr *new, struct attr *old); |
d62a17ae | 267 | extern struct attr *bgp_attr_intern(struct attr *attr); |
d62a17ae | 268 | extern void bgp_attr_unintern_sub(struct attr *); |
269 | extern void bgp_attr_unintern(struct attr **); | |
270 | extern void bgp_attr_flush(struct attr *); | |
d7c0a89a QY |
271 | extern struct attr *bgp_attr_default_set(struct attr *attr, uint8_t); |
272 | extern struct attr *bgp_attr_aggregate_intern(struct bgp *, uint8_t, | |
d62a17ae | 273 | struct aspath *, |
274 | struct community *, int as_set, | |
d7c0a89a | 275 | uint8_t); |
d62a17ae | 276 | extern bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *, |
277 | struct stream *, struct attr *, | |
278 | struct bpacket_attr_vec_arr *vecarr, | |
279 | struct prefix *, afi_t, safi_t, | |
280 | struct peer *, struct prefix_rd *, | |
d7c0a89a | 281 | mpls_label_t *, uint32_t, int, uint32_t); |
d62a17ae | 282 | extern void bgp_dump_routes_attr(struct stream *, struct attr *, |
283 | struct prefix *); | |
284 | extern int attrhash_cmp(const void *, const void *); | |
285 | extern unsigned int attrhash_key_make(void *); | |
286 | extern void attr_show_all(struct vty *); | |
287 | extern unsigned long int attr_count(void); | |
288 | extern unsigned long int attr_unknown_count(void); | |
718e3744 | 289 | |
290 | /* Cluster list prototypes. */ | |
d62a17ae | 291 | extern int cluster_loop_check(struct cluster_list *, struct in_addr); |
292 | extern void cluster_unintern(struct cluster_list *); | |
718e3744 | 293 | |
294 | /* Transit attribute prototypes. */ | |
d62a17ae | 295 | void transit_unintern(struct transit *); |
00d252cb | 296 | |
835315bf PJ |
297 | /* Below exported for unit-test purposes only */ |
298 | struct bgp_attr_parser_args { | |
d62a17ae | 299 | struct peer *peer; |
300 | bgp_size_t length; /* attribute data length; */ | |
301 | bgp_size_t total; /* total length, inc header */ | |
302 | struct attr *attr; | |
d7c0a89a QY |
303 | uint8_t type; |
304 | uint8_t flags; | |
305 | uint8_t *startp; | |
835315bf | 306 | }; |
d62a17ae | 307 | extern int bgp_mp_reach_parse(struct bgp_attr_parser_args *args, |
308 | struct bgp_nlri *); | |
309 | extern int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args, | |
310 | struct bgp_nlri *); | |
30adbd4e DS |
311 | extern bgp_attr_parse_ret_t |
312 | bgp_attr_prefix_sid(int32_t tlength, struct bgp_attr_parser_args *args, | |
313 | struct bgp_nlri *mp_update); | |
03292809 | 314 | |
f4c89855 LB |
315 | extern struct bgp_attr_encap_subtlv * |
316 | encap_tlv_dup(struct bgp_attr_encap_subtlv *orig); | |
317 | ||
d62a17ae | 318 | extern void bgp_attr_flush_encap(struct attr *attr); |
f4c89855 | 319 | |
8c71e481 PM |
320 | /** |
321 | * Set of functions to encode MP_REACH_NLRI and MP_UNREACH_NLRI attributes. | |
322 | * Typical call sequence is to call _start(), followed by multiple _prefix(), | |
323 | * one for each NLRI that needs to be encoded into the UPDATE message, and | |
324 | * finally the _end() function. | |
325 | */ | |
2b26882d | 326 | extern size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, |
d62a17ae | 327 | afi_t afi, safi_t safi, |
328 | struct bpacket_attr_vec_arr *vecarr, | |
8c71e481 PM |
329 | struct attr *attr); |
330 | extern void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi, | |
331 | struct prefix *p, struct prefix_rd *prd, | |
d7c0a89a QY |
332 | mpls_label_t *label, uint32_t num_labels, |
333 | int addpath_encode, uint32_t addpath_tx_id, | |
334 | struct attr *); | |
93b73dfa | 335 | extern size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi, |
d62a17ae | 336 | struct prefix *p); |
8c71e481 PM |
337 | extern void bgp_packet_mpattr_end(struct stream *s, size_t sizep); |
338 | ||
d62a17ae | 339 | extern size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, |
340 | safi_t safi); | |
341 | extern void bgp_packet_mpunreach_prefix(struct stream *s, struct prefix *p, | |
342 | afi_t afi, safi_t safi, | |
996c9314 | 343 | struct prefix_rd *prd, mpls_label_t *, |
d7c0a89a | 344 | uint32_t, int, uint32_t, struct attr *); |
d62a17ae | 345 | extern void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt); |
8c71e481 | 346 | |
d7c0a89a QY |
347 | static inline int bgp_rmap_nhop_changed(uint32_t out_rmap_flags, |
348 | uint32_t in_rmap_flags) | |
3811f1e2 | 349 | { |
d62a17ae | 350 | return ((CHECK_FLAG(out_rmap_flags, BATTR_RMAP_NEXTHOP_PEER_ADDRESS) |
351 | || CHECK_FLAG(out_rmap_flags, BATTR_RMAP_NEXTHOP_UNCHANGED) | |
352 | || CHECK_FLAG(out_rmap_flags, BATTR_RMAP_IPV4_NHOP_CHANGED) | |
353 | || CHECK_FLAG(out_rmap_flags, | |
354 | BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED) | |
355 | || CHECK_FLAG(out_rmap_flags, | |
356 | BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED) | |
357 | || CHECK_FLAG(out_rmap_flags, BATTR_RMAP_IPV6_LL_NHOP_CHANGED) | |
358 | || CHECK_FLAG(in_rmap_flags, BATTR_RMAP_NEXTHOP_UNCHANGED)) | |
359 | ? 1 | |
360 | : 0); | |
3811f1e2 DS |
361 | } |
362 | ||
d7c0a89a | 363 | static inline uint32_t mac_mobility_seqnum(struct attr *attr) |
128ea8ab | 364 | { |
d62a17ae | 365 | return (attr) ? attr->mm_seqnum : 0; |
128ea8ab | 366 | } |
367 | ||
00d252cb | 368 | #endif /* _QUAGGA_BGP_ATTR_H */ |