bgp_attr.h
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上传日期:2009-11-15
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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))
- /* 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 *, u_char *);
- bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p, afi_t, safi_t, struct prefix_rd *, u_char *);
- void bgp_dump_routes_attr (struct stream *, struct attr *);
- 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 *);