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       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         .cast = RTC_UNICAST,
  82         .dest = RTD_DEVICE,
  83         .iface = ad->iface
  84       };
  85
  86       a = rta_lookup(&a0);
  87       e = rte_get_temp(a);
  88       e->pflags = 0;
  89       rte_update2(c, &ad->prefix, e, src);
  90     }
  91 }
  92
  93 static void
  94 dev_if_notify(struct proto *p, uint c, struct iface *iface)
  95 {
  96   struct rt_dev_config *cf = (void *) p->cf;
  97
  98   if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
  99     return;
 100
 101   if ((c & IF_CHANGE_LINK) && cf->check_link)
 102   {
 103     uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
 104
 105     struct ifa *a;
 106     WALK_LIST(a, iface->addrs)
 107       dev_ifa_notify(p, ac, a);
 108   }
 109 }
 110
 111
 112 static struct proto *
 113 dev_init(struct proto_config *CF)
 114 {
 115   struct proto *P = proto_new(CF);
 116   struct rt_dev_proto *p = (void *) P;
 117   // struct rt_dev_config *cf = (void *) CF;
 118
 119   proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
 120   proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 121
 122   P->if_notify = dev_if_notify;
 123   P->ifa_notify = dev_ifa_notify;
 124
 125   return P;
 126 }
 127
 128 static int
 129 dev_reconfigure(struct proto *P, struct proto_config *CF)
 130 {
 131   struct rt_dev_proto *p = (void *) P;
 132   struct rt_dev_config *o = (void *) P->cf;
 133   struct rt_dev_config *n = (void *) CF;
 134
 135   if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
 136       (o->check_link != n->check_link))
 137     return 0;
 138
 139   return
 140     proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&
 141     proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
 142
 143   return 1;
 144 }
 145
 146 static void
 147 dev_copy_config(struct proto_config *dest, struct proto_config *src)
 148 {
 149   struct rt_dev_config *d = (void *) dest;
 150   struct rt_dev_config *s = (void *) src;
 151
 152   /*
 153    * We copy iface_list as ifaces can be shared by more direct protocols.
 154    * Copy suffices to be is shallow, because new nodes can be added, but
 155    * old nodes cannot be modified (although they contain internal lists).
 156    */
 157   cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
 158
 159   d->check_link = s->check_link;
 160 }
 161
 162 struct protocol proto_device = {
 163   .name =               "Direct",
 164   .template =           "direct%d",
 165   .preference =         DEF_PREF_DIRECT,
 166   .channel_mask =       NB_IP,
 167   .proto_size =         sizeof(struct rt_dev_proto),
 168   .config_size =        sizeof(struct rt_dev_config),
 169   .init =               dev_init,
 170   .reconfigure =        dev_reconfigure,
 171   .copy_config =        dev_copy_config
 172 };