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/* BGP attributes.
Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
This file is part of GNU Zebra.
GNU Zebra is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
GNU Zebra is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Zebra; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/* Simple bit mapping. */
#define BITMAP_NBBY 8
#define SET_BITMAP(MAP, NUM) \
SET_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
#define CHECK_BITMAP(MAP, NUM) \
CHECK_FLAG (MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
#define BGP_MED_MAX UINT32_MAX
/* BGP Attribute type range. */
#define BGP_ATTR_TYPE_RANGE 256
#define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
/* BGP Attribute flags. */
#define BGP_ATTR_FLAG_OPTIONAL 0x80 /* Attribute is optional. */
#define BGP_ATTR_FLAG_TRANS 0x40 /* Attribute is transitive. */
#define BGP_ATTR_FLAG_PARTIAL 0x20 /* Attribute is partial. */
#define BGP_ATTR_FLAG_EXTLEN 0x10 /* Extended length flag. */
/* BGP attribute header must bigger than 2. */
#define BGP_ATTR_MIN_LEN 2 /* Attribute flag and type. */
/* BGP attribute structure. */
struct attr
{
/* Reference count of this attribute. */
unsigned long refcnt;
/* Flag of attribute is set or not. */
u_int32_t flag;
/* Attributes. */
u_char origin;
struct in_addr nexthop;
u_int32_t med;
u_int32_t local_pref;
as_t aggregator_as;
struct in_addr aggregator_addr;
u_int32_t weight;
struct in_addr originator_id;
struct cluster_list *cluster;
u_char mp_nexthop_len;
#ifdef HAVE_IPV6
struct in6_addr mp_nexthop_global;
struct in6_addr mp_nexthop_local;
#endif /* HAVE_IPV6 */
struct in_addr mp_nexthop_global_in;
struct in_addr mp_nexthop_local_in;
/* AS Path structure */
struct aspath *aspath;
/* Community structure */
struct community *community;
/* Extended Communities attribute. */
struct ecommunity *ecommunity;
/* Unknown transitive attribute. */
struct transit *transit;
};
/* Router Reflector related structure. */
struct cluster_list
{
unsigned long refcnt;
int length;
struct in_addr *list;
};
/* Unknown transit attribute. */
struct transit
{
unsigned long refcnt;
int length;
u_char *val;
};
#define ATTR_FLAG_BIT(X) (1 << ((X) - 1))
/* Prototypes. */
void bgp_attr_init ();
int bgp_attr_parse (struct peer *, struct attr *, bgp_size_t,
struct bgp_nlri *, struct bgp_nlri *);
int bgp_attr_check (struct peer *, struct attr *);
struct attr *bgp_attr_intern (struct attr *attr);
void bgp_attr_unintern (struct attr *);
void bgp_attr_flush (struct attr *);
struct attr *bgp_attr_default_set (struct attr *attr, u_char);
struct attr *bgp_attr_default_intern (u_char);
struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char,
struct aspath *,
struct community *, int as_set);
bgp_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 *, char *);
bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s,
struct prefix *p, afi_t, safi_t,
struct prefix_rd *, char *);
void bgp_dump_routes_attr (struct stream *, struct attr *, struct prefix *);
unsigned int attrhash_key_make (struct attr *);
int attrhash_cmp (struct attr *, struct attr *);
void attr_show_all (struct vty *);
/* Cluster list prototypes. */
int cluster_loop_check (struct cluster_list *, struct in_addr);
void cluster_unintern (struct cluster_list *);
/* Transit attribute prototypes. */
void transit_unintern (struct transit *);
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