bird/proto/ospf/lsreq.c

/*
 *	BIRD -- OSPF
 *
 *	(c) 2000--2004 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#include "ospf.h"

void
ospf_lsreq_send(struct ospf_neighbor *n)
{
  snode *sn;
  struct top_hash_entry *en;
  struct ospf_lsreq_packet *pk;
  struct ospf_packet *op;
  struct ospf_lsreq_header *lsh;
  u16 length;
  int i, j;
  struct proto *p = &n->ifa->proto->proto;

  pk = (struct ospf_lsreq_packet *) n->ifa->ip_sk->tbuf;
  op = (struct ospf_packet *) n->ifa->ip_sk->tbuf;

  fill_ospf_pkt_hdr(n->ifa, pk, LSREQ_P);

  sn = SHEAD(n->lsrql);
  if (EMPTY_SLIST(n->lsrql))
  {
    if (n->state == NEIGHBOR_LOADING)
      ospf_neigh_sm(n, INM_LOADDONE);
    return;
  }

  i = j = (n->ifa->iface->mtu - SIPH - sizeof(struct ospf_lsreq_packet)) /
    sizeof(struct ospf_lsreq_header);
  lsh = (struct ospf_lsreq_header *) (pk + 1);

  for (; i > 0; i--)
  {
    en = (struct top_hash_entry *) sn;
    lsh->padd1 = 0;
    lsh->padd2 = 0;
    lsh->type = en->lsa.type;
    lsh->rt = htonl(en->lsa.rt);
    lsh->id = htonl(en->lsa.id);
    DBG("Requesting %uth LSA: Type: %u, Id: %I, RT: %I\n", i, en->lsa.type,
	en->lsa.id, en->lsa.rt);
    lsh++;
    if (sn == STAIL(n->lsrql))
      break;
    sn = sn->next;
  }
  if (i != 0)
    i--;

  length =
    sizeof(struct ospf_lsreq_packet) + (j -
					i) * sizeof(struct ospf_lsreq_header);
  op->length = htons(length);
  ospf_pkt_finalize(n->ifa, op);
  sk_send_to(n->ifa->ip_sk, length, n->ip, OSPF_PROTO);
  OSPF_TRACE(D_PACKETS, "LS request sent to: %I", n->rid);
}

void
ospf_lsreq_receive(struct ospf_lsreq_packet *ps,
		   struct ospf_iface *ifa, u16 size)
{
  u32 nrid;
  struct ospf_neighbor *n;
  struct ospf_lsreq_header *lsh;
  struct l_lsr_head *llsh;
  list uplist;
  slab *upslab;
  int length, i, lsano;
  struct proto *p = (struct proto *) ifa->proto;

  nrid = ntohl(ps->ospf_packet.routerid);

  if ((n = find_neigh(ifa, nrid)) == NULL)
  {
    OSPF_TRACE(D_PACKETS, "Received lsreq from unknown neighbor! (%I)", nrid);
    return;
  }
  if (n->state < NEIGHBOR_EXCHANGE)
    return;

  OSPF_TRACE(D_EVENTS, "Received LS req from neighbor: %I", n->ip);
  ospf_neigh_sm(n, INM_HELLOREC);

  length = ntohs(ps->ospf_packet.length);
  lsh = (void *) (ps + 1);
  init_list(&uplist);
  upslab = sl_new(n->pool, sizeof(struct l_lsr_head));

  lsano = (length - sizeof(struct ospf_lsreq_packet)) /
    sizeof(struct ospf_lsreq_header);
  for (i = 0; i < lsano; lsh++, i++)
  {
    DBG("Processing LSA: ID=%I, Type=%u, Router=%I\n", ntohl(lsh->id),
	lsh->type, ntohl(lsh->rt));
    llsh = sl_alloc(upslab);
    llsh->lsh.id = ntohl(lsh->id);
    llsh->lsh.rt = ntohl(lsh->rt);
    llsh->lsh.type = lsh->type;
    add_tail(&uplist, NODE llsh);
    if (ospf_hash_find(n->ifa->oa->gr, llsh->lsh.id, llsh->lsh.rt,
		       llsh->lsh.type) == NULL)
    {
      log(L_WARN "Received bad LS req from: %I looking: RT: %I, ID: %I, Type: %u",
	  n->ip, lsh->rt, lsh->id, lsh->type);
      ospf_neigh_sm(n, INM_BADLSREQ);
      rfree(upslab);
      return;
    }
  }
  ospf_lsupd_tx_list(n, &uplist);
  rfree(upslab);
}