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
  28 static void
  29 dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
  30 {
  31   struct rt_dev_proto *p = (void *) P;
  32   struct rt_dev_config *cf = (void *) P->cf;
  33   struct channel *c;
  34
  35   if (!EMPTY_LIST(cf->iface_list) &&
  36       !iface_patt_find(&cf->iface_list, ad->iface, ad->iface->addr))
  37     /* Empty list is automatically treated as "*" */
  38     return;
  39
  40   if (ad->flags & IA_SECONDARY)
  41     return;
  42
  43   if (ad->scope <= SCOPE_LINK)
  44     return;
  45
  46   if (ad->prefix.type == NET_IP4)
  47     c = p->ip4_channel;
  48   else if (ad->prefix.type == NET_IP6)
  49     c = p->ip6_channel;
  50   else
  51     return;
  52
  53   if (!c)
  54     return;
  55
  56   if (flags & IF_CHANGE_DOWN)
  57     {
  58       DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
  59
  60       /* Use iface ID as local source ID */
  61       struct rte_src *src = rt_get_source(P, ad->iface->index);
  62       rte_update2(c, &ad->prefix, NULL, src);
  63     }
  64   else if (flags & IF_CHANGE_UP)
  65     {
  66       rta *a;
  67       rte *e;
  68
  69       DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
  70
  71       /* Use iface ID as local source ID */
  72       struct rte_src *src = rt_get_source(P, ad->iface->index);
  73
  74       rta a0 = {
  75         .src = src,
  76         .source = RTS_DEVICE,
  77         .scope = SCOPE_UNIVERSE,
  78         .cast = RTC_UNICAST,
  79         .dest = RTD_DEVICE,
  80         .iface = ad->iface
  81       };
  82
  83       a = rta_lookup(&a0);
  84       e = rte_get_temp(a);
  85       e->pflags = 0;
  86       rte_update2(c, &ad->prefix, e, src);
  87     }
  88 }
  89
  90 static struct proto *
  91 dev_init(struct proto_config *CF)
  92 {
  93   struct proto *P = proto_new(CF);
  94   struct rt_dev_proto *p = (void *) P;
  95   // struct rt_dev_config *cf = (void *) CF;
  96
  97   proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
  98   proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
  99
 100   P->ifa_notify = dev_ifa_notify;
 101
 102   return P;
 103 }
 104
 105 static int
 106 dev_reconfigure(struct proto *P, struct proto_config *CF)
 107 {
 108   struct rt_dev_proto *p = (void *) P;
 109   struct rt_dev_config *o = (void *) P->cf;
 110   struct rt_dev_config *n = (void *) CF;
 111
 112   if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL))
 113     return 0;
 114
 115   return
 116     proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&
 117     proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 118
 119   return 1;
 120 }
 121
 122 static void
 123 dev_copy_config(struct proto_config *dest, struct proto_config *src)
 124 {
 125   struct rt_dev_config *d = (void *) dest;
 126   struct rt_dev_config *s = (void *) src;
 127
 128   /*
 129    * We copy iface_list as ifaces can be shared by more direct protocols.
 130    * Copy suffices to be is shallow, because new nodes can be added, but
 131    * old nodes cannot be modified (although they contain internal lists).
 132    */
 133   cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
 134 }
 135
 136 struct protocol proto_device = {
 137   .name =               "Direct",
 138   .template =           "direct%d",
 139   .preference =         DEF_PREF_DIRECT,
 140   .channel_mask =       NB_IP,
 141   .proto_size =         sizeof(struct rt_dev_proto),
 142   .config_size =        sizeof(struct rt_dev_config),
 143   .init =               dev_init,
 144   .reconfigure =        dev_reconfigure,
 145   .copy_config =        dev_copy_config
 146 };