Internet on FIRE

/*

 *        BIRD -- Direct Device Routes

 *

 *        (c) 1998--2000 Martin Mares <mj@ucw.cz>

 *

 *        Can be freely distributed and used under the terms of the GNU GPL.

 */

/**

 * DOC: Direct

 *

 * The Direct protocol works by converting all ifa_notify() events it receives

 * to rte_update() calls for the corresponding network.

 */

#undef LOCAL_DEBUG

#include "nest/bird.h"

#include "nest/iface.h"

#include "nest/protocol.h"

#include "nest/route.h"

#include "nest/rt-dev.h"

#include "conf/conf.h"

#include "lib/resource.h"

#include "lib/string.h"

static void

dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)

{

  struct rt_dev_proto *p = (void *) P;

  struct rt_dev_config *cf = (void *) P->cf;

  struct channel *c;

  if (!EMPTY_LIST(cf->iface_list) &&

      !iface_patt_find(&cf->iface_list, ad->iface, ad->iface->addr))

    /* Empty list is automatically treated as "*" */

    return;

  if (ad->flags & IA_SECONDARY)

    return;

  if (ad->scope <= SCOPE_LINK)

    return;

  if (ad->prefix.type == NET_IP4)

    c = p->ip4_channel;

  else if (ad->prefix.type == NET_IP6)

    c = p->ip6_channel;

  else

    return;

  if (!c)

    return;

  if (flags & IF_CHANGE_DOWN)

    {

      DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);

      /* Use iface ID as local source ID */

      struct rte_src *src = rt_get_source(P, ad->iface->index);

      rte_update2(c, &ad->prefix, NULL, src);

    }

  else if (flags & IF_CHANGE_UP)

    {

      rta *a;

      rte *e;

      DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);

      if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))

        return;

      /* Use iface ID as local source ID */

      struct rte_src *src = rt_get_source(P, ad->iface->index);

      rta a0 = {

        .src = src,

        .source = RTS_DEVICE,

        .scope = SCOPE_UNIVERSE,

        .dest = RTD_UNICAST,

        .nh.iface = ad->iface,

      };

      a = rta_lookup(&a0);

      e = rte_get_temp(a);

      e->pflags = 0;

      rte_update2(c, &ad->prefix, e, src);

    }

}

static void

dev_if_notify(struct proto *p, uint c, struct iface *iface)

{

  struct rt_dev_config *cf = (void *) p->cf;

  if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))

    return;

  if ((c & IF_CHANGE_LINK) && cf->check_link)

  {

    uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;

    struct ifa *a;

    WALK_LIST(a, iface->addrs)

      dev_ifa_notify(p, ac, a);

  }

}

static struct proto *

dev_init(struct proto_config *CF)

{

  struct proto *P = proto_new(CF);

  struct rt_dev_proto *p = (void *) P;

  // struct rt_dev_config *cf = (void *) CF;

  proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));

  proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));

  P->if_notify = dev_if_notify;

  P->ifa_notify = dev_ifa_notify;

  return P;

}

static int

dev_reconfigure(struct proto *P, struct proto_config *CF)

{

  struct rt_dev_proto *p = (void *) P;

  struct rt_dev_config *o = (void *) P->cf;

  struct rt_dev_config *n = (void *) CF;

  if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||

      (o->check_link != n->check_link))

    return 0;

  return

    proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) &&

    proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));

  return 1;

}

static void

dev_copy_config(struct proto_config *dest, struct proto_config *src)

{

  struct rt_dev_config *d = (void *) dest;

  struct rt_dev_config *s = (void *) src;

  /*

   * We copy iface_list as ifaces can be shared by more direct protocols.

   * Copy suffices to be is shallow, because new nodes can be added, but

   * old nodes cannot be modified (although they contain internal lists).

   */

  cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));

  d->check_link = s->check_link;

}

struct protocol proto_device = {

  .name =                 "Direct",

  .template =                 "direct%d",

  .preference =                DEF_PREF_DIRECT,

  .channel_mask =        NB_IP,

  .proto_size =                sizeof(struct rt_dev_proto),

  .config_size =        sizeof(struct rt_dev_config),

  .init =                 dev_init,

  .reconfigure =         dev_reconfigure,

  .copy_config =         dev_copy_config

};