C++ (Cpp) lsa_hton_hdr Examples

Example #1

File: lsalib.c Project: BIRD/bird

void
lsa_generate_checksum(struct ospf_lsa_header *lsa, const u8 *body)
{
  struct fletcher16_context ctx;
  struct ospf_lsa_header hdr;
  u16 len = lsa->length;

  /*
   * lsa and body are in the host order, we need to compute Fletcher-16 checksum
   * for data in the network order. We also skip the initial age field.
   */

  lsa_hton_hdr(lsa, &hdr);
  hdr.checksum = 0;

  fletcher16_init(&ctx);
  fletcher16_update(&ctx, (u8 *) &hdr + 2, sizeof(struct ospf_lsa_header) - 2);
  fletcher16_update_n32(&ctx, body, len - sizeof(struct ospf_lsa_header));
  lsa->checksum = fletcher16_final(&ctx, len, OFFSETOF(struct ospf_lsa_header, checksum));
}

Example #2

File: lsalib.c Project: bootc/bird

/* FIXME This is VERY uneficient, I have huge endianity problems */
void
lsasum_calculate(struct ospf_lsa_header *h, void *body)
{
  u16 length = h->length;

  //  log(L_WARN "Checksum %R %R %d start (len %d)", h->id, h->rt, h->type, length);
  lsa_hton_hdr(h, h);
  lsa_hton_body1(body, length - sizeof(struct ospf_lsa_header));

  /*
  char buf[1024];
  memcpy(buf, h, sizeof(struct ospf_lsa_header));
  memcpy(buf + sizeof(struct ospf_lsa_header), body, length - sizeof(struct ospf_lsa_header));
  buf_dump("CALC", buf, length);
  */

  (void) lsasum_check(h, body, 1);

  //  log(L_WARN "Checksum result %4x", h->checksum);

  lsa_ntoh_hdr(h, h);
  lsa_ntoh_body1(body, length - sizeof(struct ospf_lsa_header));
}

Example #3

File: dbdes.c Project: ColinBS/bird

static void
ospf_prepare_dbdes(struct ospf_proto *p, struct ospf_neighbor *n)
{
  struct ospf_iface *ifa = n->ifa;
  struct ospf_packet *pkt;
  uint length;

  u16 iface_mtu = (ifa->type == OSPF_IT_VLINK) ? 0 : ifa->iface->mtu;

  /* Update DBDES buffer */
  if (n->ldd_bsize != ifa->tx_length)
  {
    mb_free(n->ldd_buffer);
    n->ldd_buffer = mb_allocz(n->pool, ifa->tx_length);
    n->ldd_bsize = ifa->tx_length;
  }

  pkt = n->ldd_buffer;
  ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);

  if (ospf_is_v2(p))
  {
    struct ospf_dbdes2_packet *ps = (void *) pkt;
    ps->iface_mtu = htons(iface_mtu);
    ps->options = ifa->oa->options;
    ps->imms = 0;	/* Will be set later */
    ps->ddseq = htonl(n->dds);
    length = sizeof(struct ospf_dbdes2_packet);
  }
  else /* OSPFv3 */
  {
    struct ospf_dbdes3_packet *ps = (void *) pkt;
    ps->options = htonl(ifa->oa->options);
    ps->iface_mtu = htons(iface_mtu);
    ps->padding = 0;
    ps->imms = 0;	/* Will be set later */
    ps->ddseq = htonl(n->dds);
    length = sizeof(struct ospf_dbdes3_packet);
  }

  /* Prepare DBDES body */
  if (!(n->myimms & DBDES_I) && (n->myimms & DBDES_M))
  {
    struct ospf_lsa_header *lsas;
    struct top_hash_entry *en;
    uint i = 0, lsa_max;

    ospf_dbdes_body(p, pkt, &lsas, &lsa_max);
    en = (void *) s_get(&(n->dbsi));

    while (i < lsa_max)
    {
      if (!SNODE_VALID(en))
      {
	n->myimms &= ~DBDES_M;	/* Unset More bit */
	break;
      }

      if ((en->lsa.age < LSA_MAXAGE) &&
	  lsa_flooding_allowed(en->lsa_type, en->domain, ifa))
      {
	lsa_hton_hdr(&(en->lsa), lsas + i);
	i++;
      }

      en = SNODE_NEXT(en);
    }

    s_put(&(n->dbsi), SNODE en);

    length += i * sizeof(struct ospf_lsa_header);
  }

  if (ospf_is_v2(p))
    ((struct ospf_dbdes2_packet *) pkt)->imms = n->myimms;
  else
    ((struct ospf_dbdes3_packet *) pkt)->imms = n->myimms;

  pkt->length = htons(length);
}