2 Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
4 This file is part of GNU Zebra.
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
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.
16 You should have received a copy of the GNU General Public License
17 along with GNU Zebra; see the file COPYING. If not, write to the Free
18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21 #ifndef _QUAGGA_BGP_ATTR_H
22 #define _QUAGGA_BGP_ATTR_H
24 /* Simple bit mapping. */
27 #define SET_BITMAP(MAP, NUM) \
28 SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
30 #define CHECK_BITMAP(MAP, NUM) \
31 CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
33 #define BGP_MED_MAX UINT32_MAX
36 /* BGP Attribute type range. */
37 #define BGP_ATTR_TYPE_RANGE 256
38 #define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
40 /* BGP Attribute flags. */
41 #define BGP_ATTR_FLAG_OPTIONAL 0x80 /* Attribute is optional. */
42 #define BGP_ATTR_FLAG_TRANS 0x40 /* Attribute is transitive. */
43 #define BGP_ATTR_FLAG_PARTIAL 0x20 /* Attribute is partial. */
44 #define BGP_ATTR_FLAG_EXTLEN 0x10 /* Extended length flag. */
46 /* BGP attribute header must bigger than 2. */
47 #define BGP_ATTR_MIN_LEN 3 /* Attribute flag, type length. */
48 #define BGP_ATTR_DEFAULT_WEIGHT 32768
50 /* Valid lengths for mp_nexthop_len */
51 #define BGP_ATTR_NHLEN_IPV4 IPV4_MAX_BYTELEN
52 #define BGP_ATTR_NHLEN_VPNV4 8+IPV4_MAX_BYTELEN
53 #define BGP_ATTR_NHLEN_IPV6_GLOBAL IPV6_MAX_BYTELEN
54 #define BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL (IPV6_MAX_BYTELEN * 2)
55 #define BGP_ATTR_NHLEN_VPNV6_GLOBAL 8+IPV6_MAX_BYTELEN
56 #define BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL ((8+IPV6_MAX_BYTELEN) * 2)
59 struct bgp_attr_encap_subtlv
{
60 struct bgp_attr_encap_subtlv
*next
; /* for chaining */
63 uint8_t value
[1]; /* will be extended */
66 /* Additional/uncommon BGP attributes.
67 * lazily allocated as and when a struct attr
72 /* Multi-Protocol Nexthop, AFI IPv6 */
73 struct in6_addr mp_nexthop_global
;
74 struct in6_addr mp_nexthop_local
;
76 /* Extended Communities attribute. */
77 struct ecommunity
*ecommunity
;
79 /* Route-Reflector Cluster attribute */
80 struct cluster_list
*cluster
;
82 /* Unknown transitive attribute. */
83 struct transit
*transit
;
85 struct in_addr mp_nexthop_global_in
;
87 /* Aggregator Router ID attribute */
88 struct in_addr aggregator_addr
;
90 /* Route Reflector Originator attribute */
91 struct in_addr originator_id
;
93 /* Local weight, not actually an attribute */
99 /* MP Nexthop length */
100 u_char mp_nexthop_len
;
102 /* MP Nexthop preference */
103 u_char mp_nexthop_prefer_global
;
108 uint16_t encap_tunneltype
; /* grr */
109 struct bgp_attr_encap_subtlv
*encap_subtlvs
; /* rfc5512 */
112 /* BGP core attribute structure. */
115 /* AS Path structure */
116 struct aspath
*aspath
;
118 /* Community structure */
119 struct community
*community
;
121 /* Lazily allocated pointer to extra attributes */
122 struct attr_extra
*extra
;
124 /* Reference count of this attribute. */
125 unsigned long refcnt
;
127 /* Flag of attribute is set or not. */
130 /* Apart from in6_addr, the remaining static attributes */
131 struct in_addr nexthop
;
133 u_int32_t local_pref
;
134 ifindex_t nh_ifindex
;
136 /* Path origin attribute */
139 /* has the route-map changed any attribute?
140 Used on the peer outbound side. */
141 u_int32_t rmap_change_flags
;
144 /* rmap_change_flags definition */
145 #define BATTR_RMAP_IPV4_NHOP_CHANGED (1 << 0)
146 #define BATTR_RMAP_NEXTHOP_PEER_ADDRESS (1 << 1)
147 #define BATTR_REFLECTED (1 << 2)
148 #define BATTR_RMAP_NEXTHOP_UNCHANGED (1 << 3)
149 #define BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED (1 << 4)
150 #define BATTR_RMAP_IPV6_LL_NHOP_CHANGED (1 << 5)
151 #define BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED (1 << 6)
153 /* Router Reflector related structure. */
156 unsigned long refcnt
;
158 struct in_addr
*list
;
161 /* Unknown transit attribute. */
164 unsigned long refcnt
;
169 #define ATTR_FLAG_BIT(X) (1 << ((X) - 1))
171 #define BGP_CLUSTER_LIST_LENGTH(attr) \
172 (((attr)->flag & ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)) ? \
173 (attr)->extra->cluster->length : 0)
176 BGP_ATTR_PARSE_PROCEED
= 0,
177 BGP_ATTR_PARSE_ERROR
= -1,
178 BGP_ATTR_PARSE_WITHDRAW
= -2,
180 /* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR */
181 BGP_ATTR_PARSE_ERROR_NOTIFYPLS
= -3,
182 } bgp_attr_parse_ret_t
;
184 struct bpacket_attr_vec_arr
;
187 extern void bgp_attr_init (void);
188 extern void bgp_attr_finish (void);
189 extern bgp_attr_parse_ret_t
bgp_attr_parse (struct peer
*, struct attr
*,
190 bgp_size_t
, struct bgp_nlri
*,
192 extern struct attr_extra
*bgp_attr_extra_get (struct attr
*);
193 extern void bgp_attr_extra_free (struct attr
*);
194 extern void bgp_attr_dup (struct attr
*, struct attr
*);
195 extern void bgp_attr_deep_dup (struct attr
*, struct attr
*);
196 extern void bgp_attr_deep_free (struct attr
*);
197 extern struct attr
*bgp_attr_intern (struct attr
*attr
);
198 extern struct attr
*bgp_attr_refcount (struct attr
*attr
);
199 extern void bgp_attr_unintern_sub (struct attr
*);
200 extern void bgp_attr_unintern (struct attr
**);
201 extern void bgp_attr_flush (struct attr
*);
202 extern struct attr
*bgp_attr_default_set (struct attr
*attr
, u_char
);
203 extern struct attr
*bgp_attr_default_intern (u_char
);
204 extern struct attr
*bgp_attr_aggregate_intern (struct bgp
*, u_char
,
206 struct community
*, int as_set
, u_char
);
207 extern bgp_size_t
bgp_packet_attribute (struct bgp
*bgp
, struct peer
*,
208 struct stream
*, struct attr
*,
209 struct bpacket_attr_vec_arr
*vecarr
,
210 struct prefix
*, afi_t
, safi_t
,
211 struct peer
*, struct prefix_rd
*,
212 u_char
*, int, u_int32_t
);
213 extern void bgp_dump_routes_attr (struct stream
*, struct attr
*,
215 extern int attrhash_cmp (const void *, const void *);
216 extern unsigned int attrhash_key_make (void *);
217 extern void attr_show_all (struct vty
*);
218 extern unsigned long int attr_count (void);
219 extern unsigned long int attr_unknown_count (void);
221 /* Cluster list prototypes. */
222 extern int cluster_loop_check (struct cluster_list
*, struct in_addr
);
223 extern void cluster_unintern (struct cluster_list
*);
225 /* Transit attribute prototypes. */
226 void transit_unintern (struct transit
*);
228 /* Below exported for unit-test purposes only */
229 struct bgp_attr_parser_args
{
231 bgp_size_t length
; /* attribute data length; */
232 bgp_size_t total
; /* total length, inc header */
238 extern int bgp_mp_reach_parse (struct bgp_attr_parser_args
*args
,
240 extern int bgp_mp_unreach_parse (struct bgp_attr_parser_args
*args
,
243 extern struct bgp_attr_encap_subtlv
*
244 encap_tlv_dup(struct bgp_attr_encap_subtlv
*orig
);
247 bgp_attr_flush_encap(struct attr
*attr
);
250 * Set of functions to encode MP_REACH_NLRI and MP_UNREACH_NLRI attributes.
251 * Typical call sequence is to call _start(), followed by multiple _prefix(),
252 * one for each NLRI that needs to be encoded into the UPDATE message, and
253 * finally the _end() function.
255 extern size_t bgp_packet_mpattr_start(struct stream
*s
, afi_t afi
, safi_t safi
,
257 struct bpacket_attr_vec_arr
*vecarr
,
259 extern void bgp_packet_mpattr_prefix(struct stream
*s
, afi_t afi
, safi_t safi
,
260 struct prefix
*p
, struct prefix_rd
*prd
,
261 u_char
*tag
, int addpath_encode
,
262 u_int32_t addpath_tx_id
);
263 extern size_t bgp_packet_mpattr_prefix_size(afi_t afi
, safi_t safi
,
265 extern void bgp_packet_mpattr_end(struct stream
*s
, size_t sizep
);
267 extern size_t bgp_packet_mpunreach_start (struct stream
*s
, afi_t afi
,
269 extern void bgp_packet_mpunreach_prefix (struct stream
*s
, struct prefix
*p
,
270 afi_t afi
, safi_t safi
, struct prefix_rd
*prd
,
271 u_char
*tag
, int, u_int32_t
);
272 extern void bgp_packet_mpunreach_end (struct stream
*s
, size_t attrlen_pnt
);
275 bgp_rmap_nhop_changed(u_int32_t out_rmap_flags
, u_int32_t in_rmap_flags
)
277 return ((CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_NEXTHOP_PEER_ADDRESS
) ||
278 CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_NEXTHOP_UNCHANGED
) ||
279 CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_IPV4_NHOP_CHANGED
) ||
280 CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED
) ||
281 CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED
) ||
282 CHECK_FLAG(out_rmap_flags
, BATTR_RMAP_IPV6_LL_NHOP_CHANGED
) ||
283 CHECK_FLAG(in_rmap_flags
, BATTR_RMAP_NEXTHOP_UNCHANGED
)) ? 1 : 0);
286 #endif /* _QUAGGA_BGP_ATTR_H */