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       net *n;
  59
  60       DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
  61       n = net_find(c->table, &ad->prefix);
  62       if (!n)
  63         {
  64           DBG("dev_if_notify: device shutdown: prefix not found\n");
  65           return;
  66         }
  67
  68       /* Use iface ID as local source ID */
  69       struct rte_src *src = rt_get_source(P, ad->iface->index);
  70       rte_update2(c, n, NULL, src);
  71     }
  72   else if (flags & IF_CHANGE_UP)
  73     {
  74       rta *a;
  75       net *n;
  76       rte *e;
  77
  78       DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
  79
  80       /* Use iface ID as local source ID */
  81       struct rte_src *src = rt_get_source(P, ad->iface->index);
  82
  83       rta a0 = {
  84         .src = src,
  85         .source = RTS_DEVICE,
  86         .scope = SCOPE_UNIVERSE,
  87         .cast = RTC_UNICAST,
  88         .dest = RTD_DEVICE,
  89         .iface = ad->iface
  90       };
  91
  92       a = rta_lookup(&a0);
  93       n = net_get(c->table, &ad->prefix);
  94       e = rte_get_temp(a);
  95       e->net = n;
  96       e->pflags = 0;
  97       rte_update2(c, n, e, src);
  98     }
  99 }
 100
 101 static struct proto *
 102 dev_init(struct proto_config *CF)
 103 {
 104   struct proto *P = proto_new(CF);
 105   struct rt_dev_proto *p = (void *) P;
 106   // struct rt_dev_config *cf = (void *) CF;
 107
 108   proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
 109   proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 110
 111   P->ifa_notify = dev_ifa_notify;
 112
 113   return P;
 114 }
 115
 116 static int
 117 dev_reconfigure(struct proto *P, struct proto_config *CF)
 118 {
 119   struct rt_dev_proto *p = (void *) P;
 120   struct rt_dev_config *o = (void *) P->cf;
 121   struct rt_dev_config *n = (void *) CF;
 122
 123   if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL))
 124     return 0;
 125
 126   return
 127     proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&
 128     proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 129
 130   return 1;
 131 }
 132
 133 static void
 134 dev_copy_config(struct proto_config *dest, struct proto_config *src)
 135 {
 136   struct rt_dev_config *d = (void *) dest;
 137   struct rt_dev_config *s = (void *) src;
 138
 139   /*
 140    * We copy iface_list as ifaces can be shared by more direct protocols.
 141    * Copy suffices to be is shallow, because new nodes can be added, but
 142    * old nodes cannot be modified (although they contain internal lists).
 143    */
 144   cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
 145 }
 146
 147 struct protocol proto_device = {
 148   .name =               "Direct",
 149   .template =           "direct%d",
 150   .preference =         DEF_PREF_DIRECT,
 151   .channel_mask =       NB_IP,
 152   .proto_size =         sizeof(struct rt_dev_proto),
 153   .config_size =        sizeof(struct rt_dev_config),
 154   .init =               dev_init,
 155   .reconfigure =        dev_reconfigure,
 156   .copy_config =        dev_copy_config
 157 };