bgpd/bgp_nexthop.h

   1 /* BGP nexthop scan
   2  * Copyright (C) 2000 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 along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _QUAGGA_BGP_NEXTHOP_H
  22 #define _QUAGGA_BGP_NEXTHOP_H
  23
  24 #include "if.h"
  25 #include "queue.h"
  26 #include "prefix.h"
  27 #include "bgp_table.h"
  28
  29 #define NEXTHOP_FAMILY(nexthop_len)                                            \
  30         (((nexthop_len) == 4 || (nexthop_len) == 12                            \
  31                   ? AF_INET                                                    \
  32                   : ((nexthop_len) == 16 || (nexthop_len) == 24                \
  33                                      || (nexthop_len) == 32                    \
  34                                      || (nexthop_len) == 48                    \
  35                              ? AF_INET6                                        \
  36                              : AF_UNSPEC)))
  37
  38 #define BGP_MP_NEXTHOP_FAMILY NEXTHOP_FAMILY
  39
  40 PREDECL_RBTREE_UNIQ(bgp_nexthop_cache);
  41
  42 /* BGP nexthop cache value structure. */
  43 struct bgp_nexthop_cache {
  44         /* RB-tree entry. */
  45         struct bgp_nexthop_cache_item entry;
  46
  47         /* IGP route's metric. */
  48         uint32_t metric;
  49
  50         /* Nexthop number and nexthop linked list.*/
  51         uint8_t nexthop_num;
  52         struct nexthop *nexthop;
  53         time_t last_update;
  54         uint16_t flags;
  55
  56 #define BGP_NEXTHOP_VALID             (1 << 0)
  57 #define BGP_NEXTHOP_REGISTERED        (1 << 1)
  58 #define BGP_NEXTHOP_CONNECTED         (1 << 2)
  59 #define BGP_NEXTHOP_PEER_NOTIFIED     (1 << 3)
  60 #define BGP_STATIC_ROUTE              (1 << 4)
  61 #define BGP_STATIC_ROUTE_EXACT_MATCH  (1 << 5)
  62 #define BGP_NEXTHOP_LABELED_VALID     (1 << 6)
  63
  64         uint16_t change_flags;
  65
  66 #define BGP_NEXTHOP_CHANGED           (1 << 0)
  67 #define BGP_NEXTHOP_METRIC_CHANGED    (1 << 1)
  68 #define BGP_NEXTHOP_CONNECTED_CHANGED (1 << 2)
  69
  70         /* Back pointer to the cache tree this entry belongs to. */
  71         struct bgp_nexthop_cache_head *tree;
  72
  73         uint32_t srte_color;
  74         struct prefix prefix;
  75         void *nht_info; /* In BGP, peer session */
  76         LIST_HEAD(path_list, bgp_path_info) paths;
  77         unsigned int path_count;
  78         struct bgp *bgp;
  79 };
  80
  81 extern int bgp_nexthop_cache_compare(const struct bgp_nexthop_cache *a,
  82                                      const struct bgp_nexthop_cache *b);
  83 DECLARE_RBTREE_UNIQ(bgp_nexthop_cache, struct bgp_nexthop_cache, entry,
  84                     bgp_nexthop_cache_compare);
  85
  86 /* Own tunnel-ip address structure */
  87 struct tip_addr {
  88         struct in_addr addr;
  89         int refcnt;
  90 };
  91
  92 struct bgp_addrv6 {
  93         struct in6_addr addrv6;
  94         struct list *ifp_name_list;
  95 };
  96
  97 /* Forward declaration(s). */
  98 struct peer;
  99 struct update_subgroup;
 100 struct bgp_dest;
 101 struct attr;
 102
 103 extern void bgp_connected_add(struct bgp *bgp, struct connected *c);
 104 extern void bgp_connected_delete(struct bgp *bgp, struct connected *c);
 105 extern bool bgp_subgrp_multiaccess_check_v4(struct in_addr nexthop,
 106                                             struct update_subgroup *subgrp,
 107                                             struct peer *exclude);
 108 extern bool bgp_subgrp_multiaccess_check_v6(struct in6_addr nexthop,
 109                                             struct update_subgroup *subgrp,
 110                                             struct peer *exclude);
 111 extern bool bgp_multiaccess_check_v4(struct in_addr nexthop, struct peer *peer);
 112 extern bool bgp_multiaccess_check_v6(struct in6_addr nexthop,
 113                                      struct peer *peer);
 114 extern int bgp_config_write_scan_time(struct vty *);
 115 extern bool bgp_nexthop_self(struct bgp *bgp, afi_t afi, uint8_t type,
 116                              uint8_t sub_type, struct attr *attr,
 117                              struct bgp_dest *dest);
 118 extern struct bgp_nexthop_cache *bnc_new(struct bgp_nexthop_cache_head *tree,
 119                                          struct prefix *prefix,
 120                                          uint32_t srte_color);
 121 extern bool bnc_existing_for_prefix(struct bgp_nexthop_cache *bnc);
 122 extern void bnc_free(struct bgp_nexthop_cache *bnc);
 123 extern struct bgp_nexthop_cache *bnc_find(struct bgp_nexthop_cache_head *tree,
 124                                           struct prefix *prefix,
 125                                           uint32_t srte_color);
 126 extern void bnc_nexthop_free(struct bgp_nexthop_cache *bnc);
 127 extern const char *bnc_str(struct bgp_nexthop_cache *bnc, char *buf, int size);
 128 extern void bgp_scan_init(struct bgp *bgp);
 129 extern void bgp_scan_finish(struct bgp *bgp);
 130 extern void bgp_scan_vty_init(void);
 131 extern void bgp_address_init(struct bgp *bgp);
 132 extern void bgp_address_destroy(struct bgp *bgp);
 133 extern void bgp_tip_add(struct bgp *bgp, struct in_addr *tip);
 134 extern void bgp_tip_del(struct bgp *bgp, struct in_addr *tip);
 135 extern void bgp_tip_hash_init(struct bgp *bgp);
 136 extern void bgp_tip_hash_destroy(struct bgp *bgp);
 137
 138 extern void bgp_nexthop_show_address_hash(struct vty *vty, struct bgp *bgp);
 139 #endif /* _QUAGGA_BGP_NEXTHOP_H */