1/* BGP attributes.
2   Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
3
4This file is part of GNU Zebra.
5
6GNU Zebra is free software; you can redistribute it and/or modify it
7under the terms of the GNU General Public License as published by the
8Free Software Foundation; either version 2, or (at your option) any
9later version.
10
11GNU Zebra is distributed in the hope that it will be useful, but
12WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU Zebra; see the file COPYING.  If not, write to the Free
18Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
1902111-1307, USA.  */
20
21/* Simple bit mapping. */
22#define BITMAP_NBBY 8
23
24#define SET_BITMAP(MAP, NUM) \
25        SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
26
27#define CHECK_BITMAP(MAP, NUM) \
28        CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
29
30/* BGP Attribute type range. */
31#define BGP_ATTR_TYPE_RANGE     256
32#define BGP_ATTR_BITMAP_SIZE    (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
33
34/* BGP Attribute flags. */
35#define BGP_ATTR_FLAG_OPTIONAL  0x80	/* Attribute is optional. */
36#define BGP_ATTR_FLAG_TRANS     0x40	/* Attribute is transitive. */
37#define BGP_ATTR_FLAG_PARTIAL   0x20	/* Attribute is partial. */
38#define BGP_ATTR_FLAG_EXTLEN    0x10	/* Extended length flag. */
39
40/* BGP attribute header must bigger than 2. */
41#define BGP_ATTR_MIN_LEN        2       /* Attribute flag and type. */
42
43/* BGP attribute structure. */
44struct attr
45{
46  /* Reference count of this attribute. */
47  unsigned long refcnt;
48
49  /* Flag of attribute is set or not. */
50  u_int32_t flag;
51
52  /* Attributes. */
53  u_char origin;
54  struct in_addr nexthop;
55  u_int32_t med;
56  u_int32_t local_pref;
57  as_t aggregator_as;
58  struct in_addr aggregator_addr;
59  u_int32_t weight;
60  struct in_addr originator_id;
61  struct cluster_list *cluster;
62
63  u_char mp_nexthop_len;
64#ifdef HAVE_IPV6
65  struct in6_addr mp_nexthop_global;
66  struct in6_addr mp_nexthop_local;
67#endif /* HAVE_IPV6 */
68  struct in_addr mp_nexthop_global_in;
69  struct in_addr mp_nexthop_local_in;
70
71  /* AS Path structure */
72  struct aspath *aspath;
73
74  /* Community structure */
75  struct community *community;
76
77  /* Extended Communities attribute. */
78  struct ecommunity *ecommunity;
79
80  /* Unknown transitive attribute. */
81  struct transit *transit;
82};
83
84/* Router Reflector related structure. */
85struct cluster_list
86{
87  unsigned long refcnt;
88  int length;
89  struct in_addr *list;
90};
91
92/* Unknown transit attribute. */
93struct transit
94{
95  unsigned long refcnt;
96  int length;
97  u_char *val;
98};
99
100#define ATTR_FLAG_BIT(X)  (1 << ((X) - 1))
101
102/* Prototypes. */
103void bgp_attr_init ();
104int bgp_attr_parse (struct peer *, struct attr *, bgp_size_t,
105		    struct bgp_nlri *, struct bgp_nlri *);
106int bgp_attr_check (struct peer *, struct attr *);
107struct attr *bgp_attr_intern (struct attr *attr);
108void bgp_attr_unintern (struct attr *);
109void bgp_attr_flush (struct attr *);
110struct attr *bgp_attr_default_set (struct attr *attr, u_char);
111struct attr *bgp_attr_default_intern (u_char);
112struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char, struct aspath *, struct community *, int as_set);
113bgp_size_t bgp_packet_attribute (struct bgp *bgp, struct peer *, struct stream *, struct attr *, struct prefix *, afi_t, safi_t, struct peer *, struct prefix_rd *, u_char *);
114bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, afi_t, safi_t, struct prefix_rd *, u_char *);
115void bgp_dump_routes_attr (struct stream *, struct attr *);
116unsigned int attrhash_key_make (struct attr *);
117int attrhash_cmp (struct attr *, struct attr *);
118void attr_show_all (struct vty *);
119
120/* Cluster list prototypes. */
121int cluster_loop_check (struct cluster_list *, struct in_addr);
122void cluster_unintern (struct cluster_list *);
123
124/* Transit attribute prototypes. */
125void transit_unintern (struct transit *);
126