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iof-bird / bird-2.0.1 / nest / rt-dev.c @ 6b3f1a54

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/*
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 *        BIRD -- Direct Device Routes
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 *
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 *        (c) 1998--2000 Martin Mares <mj@ucw.cz>
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 *
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 *        Can be freely distributed and used under the terms of the GNU GPL.
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 */
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/**
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 * DOC: Direct
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 *
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 * The Direct protocol works by converting all ifa_notify() events it receives
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 * to rte_update() calls for the corresponding network.
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 */
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#undef LOCAL_DEBUG
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "nest/rt-dev.h"
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#include "conf/conf.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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static void
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dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
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{
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  struct rt_dev_proto *p = (void *) P;
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  struct rt_dev_config *cf = (void *) P->cf;
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  struct channel *c;
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  if (!EMPTY_LIST(cf->iface_list) &&
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      !iface_patt_find(&cf->iface_list, ad->iface, ad))
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    /* Empty list is automatically treated as "*" */
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    return;
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  if (ad->flags & IA_SECONDARY)
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    return;
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  if (ad->scope <= SCOPE_LINK)
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    return;
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  if (ad->prefix.type == NET_IP4)
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    c = p->ip4_channel;
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  else if (ad->prefix.type == NET_IP6)
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    c = p->ip6_channel;
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  else
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    return;
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  if (!c)
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    return;
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  if (flags & IF_CHANGE_DOWN)
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    {
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      DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
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      /* Use iface ID as local source ID */
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      struct rte_src *src = rt_get_source(P, ad->iface->index);
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      rte_update2(c, &ad->prefix, NULL, src);
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    }
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  else if (flags & IF_CHANGE_UP)
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    {
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      rta *a;
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      rte *e;
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      DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
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      if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
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        return;
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      /* Use iface ID as local source ID */
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      struct rte_src *src = rt_get_source(P, ad->iface->index);
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      rta a0 = {
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        .src = src,
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        .source = RTS_DEVICE,
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        .scope = SCOPE_UNIVERSE,
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        .dest = RTD_UNICAST,
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        .nh.iface = ad->iface,
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      };
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      a = rta_lookup(&a0);
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      e = rte_get_temp(a);
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      e->pflags = 0;
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      rte_update2(c, &ad->prefix, e, src);
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    }
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}
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static void
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dev_if_notify(struct proto *p, uint c, struct iface *iface)
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{
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  struct rt_dev_config *cf = (void *) p->cf;
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  if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
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    return;
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  if ((c & IF_CHANGE_LINK) && cf->check_link)
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  {
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    uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
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    struct ifa *a;
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    WALK_LIST(a, iface->addrs)
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      dev_ifa_notify(p, ac, a);
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  }
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}
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static struct proto *
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dev_init(struct proto_config *CF)
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{
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  struct proto *P = proto_new(CF);
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  struct rt_dev_proto *p = (void *) P;
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  // struct rt_dev_config *cf = (void *) CF;
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  proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
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  proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
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  P->if_notify = dev_if_notify;
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  P->ifa_notify = dev_ifa_notify;
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  return P;
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}
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static int
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dev_reconfigure(struct proto *P, struct proto_config *CF)
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{
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  struct rt_dev_proto *p = (void *) P;
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  struct rt_dev_config *o = (void *) P->cf;
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  struct rt_dev_config *n = (void *) CF;
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  if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
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      (o->check_link != n->check_link))
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    return 0;
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  return
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    proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&
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    proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
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  return 1;
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}
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static void
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dev_copy_config(struct proto_config *dest, struct proto_config *src)
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{
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  struct rt_dev_config *d = (void *) dest;
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  struct rt_dev_config *s = (void *) src;
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  /*
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   * We copy iface_list as ifaces can be shared by more direct protocols.
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   * Copy suffices to be is shallow, because new nodes can be added, but
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   * old nodes cannot be modified (although they contain internal lists).
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   */
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  cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
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  d->check_link = s->check_link;
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}
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struct protocol proto_device = {
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  .name =                 "Direct",
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  .template =                 "direct%d",
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  .preference =                DEF_PREF_DIRECT,
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  .channel_mask =        NB_IP,
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  .proto_size =                sizeof(struct rt_dev_proto),
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  .config_size =        sizeof(struct rt_dev_config),
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  .init =                 dev_init,
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  .reconfigure =         dev_reconfigure,
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  .copy_config =         dev_copy_config
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};