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