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))
  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       if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
  72         return;
  73
  74       /* Use iface ID as local source ID */
  75       struct rte_src *src = rt_get_source(P, ad->iface->index);
  76
  77       rta a0 = {
  78         .src = src,
  79         .source = RTS_DEVICE,
  80         .scope = SCOPE_UNIVERSE,
  81         .dest = RTD_UNICAST,
  82         .nh.iface = ad->iface,
  83       };
  84
  85       a = rta_lookup(&a0);
  86       e = rte_get_temp(a);
  87       e->pflags = 0;
  88       rte_update2(c, &ad->prefix, e, src);
  89     }
  90 }
  91
  92 static void
  93 dev_if_notify(struct proto *p, uint c, struct iface *iface)
  94 {
  95   struct rt_dev_config *cf = (void *) p->cf;
  96
  97   if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
  98     return;
  99
 100   if ((c & IF_CHANGE_LINK) && cf->check_link)
 101   {
 102     uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
 103
 104     struct ifa *a;
 105     WALK_LIST(a, iface->addrs)
 106       dev_ifa_notify(p, ac, a);
 107   }
 108 }
 109
 110
 111 static struct proto *
 112 dev_init(struct proto_config *CF)
 113 {
 114   struct proto *P = proto_new(CF);
 115   struct rt_dev_proto *p = (void *) P;
 116   // struct rt_dev_config *cf = (void *) CF;
 117
 118   proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
 119   proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 120
 121   P->if_notify = dev_if_notify;
 122   P->ifa_notify = dev_ifa_notify;
 123
 124   return P;
 125 }
 126
 127 static int
 128 dev_reconfigure(struct proto *P, struct proto_config *CF)
 129 {
 130   struct rt_dev_proto *p = (void *) P;
 131   struct rt_dev_config *o = (void *) P->cf;
 132   struct rt_dev_config *n = (void *) CF;
 133
 134   if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
 135       (o->check_link != n->check_link))
 136     return 0;
 137
 138   return
 139     proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&
 140     proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 141
 142   return 1;
 143 }
 144
 145 static void
 146 dev_copy_config(struct proto_config *dest, struct proto_config *src)
 147 {
 148   struct rt_dev_config *d = (void *) dest;
 149   struct rt_dev_config *s = (void *) src;
 150
 151   /*
 152    * We copy iface_list as ifaces can be shared by more direct protocols.
 153    * Copy suffices to be is shallow, because new nodes can be added, but
 154    * old nodes cannot be modified (although they contain internal lists).
 155    */
 156   cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
 157
 158   d->check_link = s->check_link;
 159 }
 160
 161 struct protocol proto_device = {
 162   .name =               "Direct",
 163   .template =           "direct%d",
 164   .preference =         DEF_PREF_DIRECT,
 165   .channel_mask =       NB_IP,
 166   .proto_size =         sizeof(struct rt_dev_proto),
 167   .config_size =        sizeof(struct rt_dev_config),
 168   .init =               dev_init,
 169   .reconfigure =        dev_reconfigure,
 170   .copy_config =        dev_copy_config
 171 };