bgpd/bgp_attr.h

   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 /* 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 #define BGP_MED_MAX UINT32_MAX
  31
  32 /* BGP Attribute type range. */
  33 #define BGP_ATTR_TYPE_RANGE     256
  34 #define BGP_ATTR_BITMAP_SIZE    (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
  35
  36 /* BGP Attribute flags. */
  37 #define BGP_ATTR_FLAG_OPTIONAL  0x80    /* Attribute is optional. */
  38 #define BGP_ATTR_FLAG_TRANS     0x40    /* Attribute is transitive. */
  39 #define BGP_ATTR_FLAG_PARTIAL   0x20    /* Attribute is partial. */
  40 #define BGP_ATTR_FLAG_EXTLEN    0x10    /* Extended length flag. */
  41
  42 /* BGP attribute header must bigger than 2. */
  43 #define BGP_ATTR_MIN_LEN        2       /* Attribute flag and type. */
  44
  45 /* BGP attribute structure. */
  46 struct attr
  47 {
  48   /* Reference count of this attribute. */
  49   unsigned long refcnt;
  50
  51   /* Flag of attribute is set or not. */
  52   u_int32_t flag;
  53
  54   /* Attributes. */
  55   u_char origin;
  56   struct in_addr nexthop;
  57   u_int32_t med;
  58   u_int32_t local_pref;
  59   as_t aggregator_as;
  60   struct in_addr aggregator_addr;
  61   u_int32_t weight;
  62   struct in_addr originator_id;
  63   struct cluster_list *cluster;
  64
  65   u_char mp_nexthop_len;
  66 #ifdef HAVE_IPV6
  67   struct in6_addr mp_nexthop_global;
  68   struct in6_addr mp_nexthop_local;
  69 #endif /* HAVE_IPV6 */
  70   struct in_addr mp_nexthop_global_in;
  71   struct in_addr mp_nexthop_local_in;
  72
  73   /* AS Path structure */
  74   struct aspath *aspath;
  75
  76   /* Community structure */
  77   struct community *community;
  78
  79   /* Extended Communities attribute. */
  80   struct ecommunity *ecommunity;
  81
  82   /* Unknown transitive attribute. */
  83   struct transit *transit;
  84 };
  85
  86 /* Router Reflector related structure. */
  87 struct cluster_list
  88 {
  89   unsigned long refcnt;
  90   int length;
  91   struct in_addr *list;
  92 };
  93
  94 /* Unknown transit attribute. */
  95 struct transit
  96 {
  97   unsigned long refcnt;
  98   int length;
  99   u_char *val;
 100 };
 101
 102 #define ATTR_FLAG_BIT(X)  (1 << ((X) - 1))
 103
 104 /* Prototypes. */
 105 void bgp_attr_init ();
 106 int bgp_attr_parse (struct peer *, struct attr *, bgp_size_t,
 107                     struct bgp_nlri *, struct bgp_nlri *);
 108 int bgp_attr_check (struct peer *, struct attr *);
 109 struct attr *bgp_attr_intern (struct attr *attr);
 110 void bgp_attr_unintern (struct attr *);
 111 void bgp_attr_flush (struct attr *);
 112 struct attr *bgp_attr_default_set (struct attr *attr, u_char);
 113 struct attr *bgp_attr_default_intern (u_char);
 114 struct attr *bgp_attr_aggregate_intern (struct bgp *, u_char,
 115                                         struct aspath *,
 116                                         struct community *, int as_set);
 117 bgp_size_t bgp_packet_attribute (struct bgp *bgp, struct peer *,
 118                                  struct stream *, struct attr *,
 119                                  struct prefix *, afi_t, safi_t,
 120                                  struct peer *, struct prefix_rd *, char *);
 121 bgp_size_t bgp_packet_withdraw (struct peer *peer, struct stream *s,
 122                                 struct prefix *p, afi_t, safi_t,
 123                                 struct prefix_rd *, char *);
 124 void bgp_dump_routes_attr (struct stream *, struct attr *, struct prefix *);
 125 unsigned int attrhash_key_make (struct attr *);
 126 int attrhash_cmp (struct attr *, struct attr *);
 127 void attr_show_all (struct vty *);
 128
 129 /* Cluster list prototypes. */
 130 int cluster_loop_check (struct cluster_list *, struct in_addr);
 131 void cluster_unintern (struct cluster_list *);
 132
 133 /* Transit attribute prototypes. */
 134 void transit_unintern (struct transit *);