1: /* BGP attributes.
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
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
19: 02111-1307, USA. */
20:
21: #ifndef _QUAGGA_BGP_ATTR_H
22: #define _QUAGGA_BGP_ATTR_H
23:
24: /* Simple bit mapping. */
25: #define BITMAP_NBBY 8
26:
27: #define SET_BITMAP(MAP, NUM) \
28: SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
29:
30: #define CHECK_BITMAP(MAP, NUM) \
31: CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
32:
33: #define BGP_MED_MAX UINT32_MAX
34:
35:
36: /* BGP Attribute type range. */
37: #define BGP_ATTR_TYPE_RANGE 256
38: #define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
39:
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. */
45:
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
49:
50: /* Additional/uncommon BGP attributes.
51: * lazily allocated as and when a struct attr
52: * requires it.
53: */
54: struct attr_extra
55: {
56: /* Multi-Protocol Nexthop, AFI IPv6 */
57: #ifdef HAVE_IPV6
58: struct in6_addr mp_nexthop_global;
59: struct in6_addr mp_nexthop_local;
60: #endif /* HAVE_IPV6 */
61:
62: /* Extended Communities attribute. */
63: struct ecommunity *ecommunity;
64:
65: /* Route-Reflector Cluster attribute */
66: struct cluster_list *cluster;
67:
68: /* Unknown transitive attribute. */
69: struct transit *transit;
70:
71: struct in_addr mp_nexthop_global_in;
72: struct in_addr mp_nexthop_local_in;
73:
74: /* Aggregator Router ID attribute */
75: struct in_addr aggregator_addr;
76:
77: /* Route Reflector Originator attribute */
78: struct in_addr originator_id;
79:
80: /* Local weight, not actually an attribute */
81: u_int32_t weight;
82:
83: /* Aggregator ASN */
84: as_t aggregator_as;
85:
86: /* MP Nexthop length */
87: u_char mp_nexthop_len;
88: };
89:
90: /* BGP core attribute structure. */
91: struct attr
92: {
93: /* AS Path structure */
94: struct aspath *aspath;
95:
96: /* Community structure */
97: struct community *community;
98:
99: /* Lazily allocated pointer to extra attributes */
100: struct attr_extra *extra;
101:
102: /* Reference count of this attribute. */
103: unsigned long refcnt;
104:
105: /* Flag of attribute is set or not. */
106: u_int32_t flag;
107:
108: /* Apart from in6_addr, the remaining static attributes */
109: struct in_addr nexthop;
110: u_int32_t med;
111: u_int32_t local_pref;
112:
113: /* Path origin attribute */
114: u_char origin;
115: };
116:
117: /* Router Reflector related structure. */
118: struct cluster_list
119: {
120: unsigned long refcnt;
121: int length;
122: struct in_addr *list;
123: };
124:
125: /* Unknown transit attribute. */
126: struct transit
127: {
128: unsigned long refcnt;
129: int length;
130: u_char *val;
131: };
132:
133: #define ATTR_FLAG_BIT(X) (1 << ((X) - 1))
134:
135: typedef enum {
136: BGP_ATTR_PARSE_PROCEED = 0,
137: BGP_ATTR_PARSE_ERROR = -1,
138: BGP_ATTR_PARSE_WITHDRAW = -2,
139: } bgp_attr_parse_ret_t;
140:
141: /* Prototypes. */
142: extern void bgp_attr_init (void);
143: extern void bgp_attr_finish (void);
144: extern bgp_attr_parse_ret_t bgp_attr_parse (struct peer *, struct attr *,
145: bgp_size_t, struct bgp_nlri *,
146: struct bgp_nlri *);
147: extern int bgp_attr_check (struct peer *, struct attr *);
148: extern struct attr_extra *bgp_attr_extra_get (struct attr *);
149: extern void bgp_attr_extra_free (struct attr *);
150: extern void bgp_attr_dup (struct attr *, struct attr *);
151: extern struct attr *bgp_attr_intern (struct attr *attr);
152: extern void bgp_attr_unintern_sub (struct attr *);
153: extern void bgp_attr_unintern (struct attr **);
154: extern void bgp_attr_flush (struct attr *);
155: extern struct attr *bgp_attr_default_set (struct attr *attr, u_char);
156: extern struct attr *bgp_attr_default_intern (u_char);
157: extern struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char,
158: struct aspath *,
159: struct community *, int as_set);
160: extern bgp_size_t bgp_packet_attribute (struct bgp *bgp, struct peer *,
161: struct stream *, struct attr *,
162: struct prefix *, afi_t, safi_t,
163: struct peer *, struct prefix_rd *, u_char *);
164: extern bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s,
165: struct prefix *p, afi_t, safi_t,
166: struct prefix_rd *, u_char *);
167: extern void bgp_dump_routes_attr (struct stream *, struct attr *,
168: struct prefix *);
169: extern int attrhash_cmp (const void *, const void *);
170: extern unsigned int attrhash_key_make (void *);
171: extern void attr_show_all (struct vty *);
172: extern unsigned long int attr_count (void);
173: extern unsigned long int attr_unknown_count (void);
174:
175: /* Cluster list prototypes. */
176: extern int cluster_loop_check (struct cluster_list *, struct in_addr);
177: extern void cluster_unintern (struct cluster_list *);
178:
179: /* Transit attribute prototypes. */
180: void transit_unintern (struct transit *);
181:
182: /* Exported for unit-test purposes only */
183: extern int bgp_mp_reach_parse (struct peer *, bgp_size_t, struct attr *,
184: struct bgp_nlri *);
185: extern int bgp_mp_unreach_parse (struct peer *, bgp_size_t, struct bgp_nlri *);
186:
187: #endif /* _QUAGGA_BGP_ATTR_H */
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