nest/iface.h

   1 /*
   2  *      BIRD Internet Routing Daemon -- Network Interfaces
   3  *
   4  *      (c) 1998--2000 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #ifndef _BIRD_IFACE_H_
  10 #define _BIRD_IFACE_H_
  11
  12 #include "lib/lists.h"
  13
  14 extern list iface_list;
  15
  16 struct proto;
  17 struct pool;
  18
  19 struct ifa {                            /* Interface address */
  20   node n;
  21   struct iface *iface;                  /* Interface this address belongs to */
  22   ip_addr ip;                           /* IP address of this host */
  23   ip_addr prefix;                       /* Network prefix */
  24   unsigned pxlen;                       /* Prefix length */
  25   ip_addr brd;                          /* Broadcast address */
  26   ip_addr opposite;                     /* Opposite end of a point-to-point link */
  27   unsigned scope;                       /* Interface address scope */
  28   unsigned flags;                       /* Analogous to iface->flags */
  29 };
  30
  31 struct iface {
  32   node n;
  33   char name[16];
  34   unsigned flags;
  35   unsigned mtu;
  36   unsigned index;                       /* OS-dependent interface index */
  37   list addrs;                           /* Addresses assigned to this interface */
  38   struct ifa *addr;                     /* Primary address */
  39   list neighbors;                       /* All neighbors on this interface */
  40 };
  41
  42 #define IF_UP 1                         /* IF_LINK_UP and IP address known */
  43 #define IF_MULTIACCESS 2
  44 #define IF_BROADCAST 4
  45 #define IF_MULTICAST 8
  46 #define IF_ADMIN_DOWN 0x10
  47 #define IF_LOOPBACK 0x20
  48 #define IF_IGNORE 0x40                  /* Not to be used by routing protocols (loopbacks etc.) */
  49 #define IF_LINK_UP 0x80
  50
  51 #define IA_PRIMARY 0x10000              /* This address is primary */
  52 #define IA_SECONDARY 0x20000            /* This address has been reported as secondary by the kernel */
  53 #define IA_UNNUMBERED 0x40000           /* This address belongs to an unnumbered device */
  54 #define IA_FLAGS 0xff0000
  55
  56 #define IF_JUST_CREATED 0x10000000      /* Send creation event as soon as possible */
  57 #define IF_TMP_DOWN 0x20000000          /* Temporary shutdown due to interface reconfiguration */
  58 #define IF_UPDATED 0x40000000           /* Touched in last scan */
  59
  60 /* Interface change events */
  61
  62 #define IF_CHANGE_UP 1
  63 #define IF_CHANGE_DOWN 2
  64 #define IF_CHANGE_MTU 4
  65 #define IF_CHANGE_CREATE 8              /* Seen this interface for the first time */
  66 #define IF_CHANGE_TOO_MUCH 0x40000000   /* Used internally */
  67
  68 void if_init(void);
  69 void if_dump(struct iface *);
  70 void if_dump_all(void);
  71 void ifa_dump(struct ifa *);
  72 void if_show(void);
  73 void if_show_summary(void);
  74 struct iface *if_update(struct iface *);
  75 struct ifa *ifa_update(struct ifa *);
  76 void ifa_delete(struct ifa *);
  77 void if_start_update(void);
  78 void if_end_update(void);
  79 void if_end_partial_update(struct iface *);
  80 void if_feed_baby(struct proto *);
  81 struct iface *if_find_by_index(unsigned);
  82 struct iface *if_find_by_name(char *);
  83 void ifa_recalc_all_primary_addresses(void);
  84
  85 /* The Neighbor Cache */
  86
  87 typedef struct neighbor {
  88   node n;                               /* Node in global neighbor list */
  89   node if_n;                            /* Node in per-interface neighbor list */
  90   ip_addr addr;                         /* Address of the neighbor */
  91   struct iface *iface;                  /* Interface it's connected to */
  92   struct proto *proto;                  /* Protocol this belongs to */
  93   void *data;                           /* Protocol-specific data */
  94   unsigned aux;                         /* Protocol-specific data */
  95   unsigned flags;
  96   unsigned scope;                       /* Address scope, SCOPE_HOST when it's our own address */
  97 } neighbor;
  98
  99 #define NEF_STICKY 1
 100
 101 neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
 102 neighbor *neigh_find2(struct proto *p, ip_addr *a, struct iface *ifa, unsigned flags);
 103
 104 static inline int neigh_connected_to(struct proto *p, ip_addr *a, struct iface *i)
 105 {
 106   neighbor *n = neigh_find(p, a, 0);
 107   return n && n->iface == i;
 108 }
 109
 110 void neigh_dump(neighbor *);
 111 void neigh_dump_all(void);
 112 void neigh_prune(void);
 113 void neigh_if_up(struct iface *);
 114 void neigh_if_down(struct iface *);
 115 void neigh_init(struct pool *);
 116
 117 /*
 118  *      Interface Pattern Lists
 119  */
 120
 121 struct iface_patt_node {
 122   node n;
 123   int positive;
 124   byte *pattern;
 125   ip_addr prefix;
 126   int pxlen;
 127 };
 128
 129 struct iface_patt {
 130   node n;
 131   list ipn_list;                        /* A list of struct iface_patt_node */
 132
 133   /* Protocol-specific data follow after this structure */
 134 };
 135
 136 struct iface_patt *iface_patt_find(list *, struct iface *);
 137 int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *));
 138
 139 #endif