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iof-bird-daemon / proto / ospf / lsreq.c @ a7a7372a

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/*
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 *        BIRD -- OSPF
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 *
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 *        (c) 2000--2004 Ondrej Filip <feela@network.cz>
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 *        (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
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 *        (c) 2009--2014 CZ.NIC z.s.p.o.
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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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#include "ospf.h"
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/*
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struct ospf_lsreq_packet
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{
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  struct ospf_packet hdr;
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  // union ospf_auth auth;
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  struct ospf_lsreq_header lsrs[];
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};
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*/
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static inline void
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ospf_lsreq_body(struct ospf_proto *p, struct ospf_packet *pkt,
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                struct ospf_lsreq_header **body, uint *count)
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{
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  uint plen = ntohs(pkt->length);
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  uint hlen = ospf_pkt_hdrlen(p);
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  *body = ((void *) pkt) + hlen;
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  *count = (plen - hlen) / sizeof(struct ospf_lsreq_header);
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}
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static void
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ospf_dump_lsreq(struct ospf_proto *p, struct ospf_packet *pkt)
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{
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  struct ospf_lsreq_header *lsrs;
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  uint i, lsr_count;
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  ASSERT(pkt->type == LSREQ_P);
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  ospf_dump_common(p, pkt);
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  ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
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  for (i = 0; i < lsr_count; i++)
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    log(L_TRACE "%s:     LSR      Type: %04x, Id: %R, Rt: %R", p->p.name,
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        ntohl(lsrs[i].type), ntohl(lsrs[i].id), ntohl(lsrs[i].rt));
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}
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void
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ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n)
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{
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  struct ospf_iface *ifa = n->ifa;
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  struct ospf_lsreq_header *lsrs;
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  struct top_hash_entry *en;
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  struct ospf_packet *pkt;
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  uint i, lsr_max, length;
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  /* RFC 2328 10.9 */
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  if (EMPTY_SLIST(n->lsrql))
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  {
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    if (n->state == NEIGHBOR_LOADING)
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      ospf_neigh_sm(n, INM_LOADDONE);
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    return;
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  }
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  pkt = ospf_tx_buffer(ifa);
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  ospf_pkt_fill_hdr(ifa, pkt, LSREQ_P);
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  ospf_lsreq_body(p, pkt, &lsrs, &lsr_max);
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  /* We send smaller LSREQ to prevent multiple LSACKs as answer */
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  lsr_max = lsr_max / 4;
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  i = 0;
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  WALK_SLIST(en, n->lsrql)
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  {
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    if (i == lsr_max)
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      break;
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    DBG("Requesting %uth LSA: Type: %04u, ID: %R, RT: %R, SN: 0x%x, Age %u\n",
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        i, en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn, en->lsa.age);
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    u32 etype = lsa_get_etype(&en->lsa, p);
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    lsrs[i].type = htonl(etype);
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    lsrs[i].rt = htonl(en->lsa.rt);
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    lsrs[i].id = htonl(en->lsa.id);
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    i++;
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  }
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  length = ospf_pkt_hdrlen(p) + i * sizeof(struct ospf_lsreq_header);
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  pkt->length = htons(length);
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  OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet sent to %I via %s", n->ip, ifa->ifname);
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  ospf_send_to(ifa, n->ip);
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}
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void
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ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa,
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                   struct ospf_neighbor *n)
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{
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  struct ospf_proto *p = ifa->oa->po;
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  struct ospf_lsreq_header *lsrs;
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  uint i, lsr_count;
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  /* RFC 2328 10.7 */
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  /* No need to check length, lsreq has only basic header */
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  OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet received from %I via %s", n->ip, ifa->ifname);
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  if (n->state < NEIGHBOR_EXCHANGE)
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    return;
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  ospf_neigh_sm(n, INM_HELLOREC);        /* Not in RFC */
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  ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
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  struct top_hash_entry *en, *entries[lsr_count];
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  for (i = 0; i < lsr_count; i++)
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  {
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    u32 id, rt, type, domain;
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    id = ntohl(lsrs[i].id);
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    rt = ntohl(lsrs[i].rt);
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    lsa_get_type_domain_(ntohl(lsrs[i].type), ifa, &type, &domain);
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    DBG("Processing requested LSA: Type: %04x, Id: %R, Rt: %R\n", type, id, rt);
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    en = ospf_hash_find(p->gr, domain, id, rt, type); 
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    if (!en)
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    {
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      log(L_WARN "%s: Received LSREQ from %I for missing LSA (Type: %04x, Id: %R, Rt: %R)",
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          p->p.name, n->ip, type, id, rt);
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      ospf_neigh_sm(n, INM_BADLSREQ);
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      return;
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    }
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    entries[i] = en;
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  }
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  ospf_send_lsupd(p, entries, lsr_count, n);
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}