nest/rt-dev.c

   1 /*
   2  *      BIRD -- Direct Device Routes
   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 /**
  10  * DOC: Direct
  11  *
  12  * The Direct protocol works by converting all ifa_notify() events it receives
  13  * to rte_update() calls for the corresponding network.
  14  */
  15
  16 #undef LOCAL_DEBUG
  17
  18 #include "nest/bird.h"
  19 #include "nest/iface.h"
  20 #include "nest/protocol.h"
  21 #include "nest/route.h"
  22 #include "nest/rt-dev.h"
  23 #include "conf/conf.h"
  24 #include "lib/resource.h"
  25 #include "lib/string.h"
  26
  27 static void
  28 dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
  29 {
  30   struct rt_dev_config *P = (void *) p->cf;
  31
  32   if (!EMPTY_LIST(P->iface_list) &&
  33       !iface_patt_find(&P->iface_list, ad->iface, ad->iface->addr))
  34     /* Empty list is automagically treated as "*" */
  35     return;
  36
  37   if (ad->scope <= SCOPE_LINK)
  38     return;
  39
  40   if (c & IF_CHANGE_DOWN)
  41     {
  42       net *n;
  43
  44       DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
  45       n = net_find(p->table, ad->prefix, ad->pxlen);
  46       if (!n)
  47         {
  48           DBG("dev_if_notify: device shutdown: prefix not found\n");
  49           return;
  50         }
  51       rte_update(p->table, n, p, p, NULL);
  52     }
  53   else if (c & IF_CHANGE_UP)
  54     {
  55       rta *a, A;
  56       net *n;
  57       rte *e;
  58
  59       DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
  60       bzero(&A, sizeof(A));
  61       A.proto = p;
  62       A.source = RTS_DEVICE;
  63       A.scope = SCOPE_UNIVERSE;
  64       A.cast = RTC_UNICAST;
  65       A.dest = RTD_DEVICE;
  66       A.iface = ad->iface;
  67       A.eattrs = NULL;
  68       a = rta_lookup(&A);
  69       n = net_get(p->table, ad->prefix, ad->pxlen);
  70       e = rte_get_temp(a);
  71       e->net = n;
  72       e->pflags = 0;
  73       rte_update(p->table, n, p, p, e);
  74     }
  75 }
  76
  77 static struct proto *
  78 dev_init(struct proto_config *c)
  79 {
  80   struct proto *p = proto_new(c, sizeof(struct proto));
  81
  82   p->ifa_notify = dev_ifa_notify;
  83   return p;
  84 }
  85
  86 static int
  87 dev_reconfigure(struct proto *p, struct proto_config *new)
  88 {
  89   struct rt_dev_config *o = (struct rt_dev_config *) p->cf;
  90   struct rt_dev_config *n = (struct rt_dev_config *) new;
  91
  92   return iface_patts_equal(&o->iface_list, &n->iface_list, NULL);
  93 }
  94
  95 struct protocol proto_device = {
  96   name:         "Direct",
  97   template:     "direct%d",
  98   init:         dev_init,
  99   reconfigure:  dev_reconfigure
 100 };