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Some cisco routers send shorter ospf messages in larger packets.

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Well it's strange, but, actually it's correct.
This commit is contained in:
Ondrej Filip 2004-06-16 23:01:49 +00:00
parent 1a61882d37
commit b4d8a0c280
1 changed files with 4 additions and 2 deletions
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6
proto/ospf/packet.c
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@ -85,6 +85,7 @@ ospf_rx_hook(sock * sk, int size)
struct ospf_iface *ifa = (struct ospf_iface *) (sk->data); struct ospf_iface *ifa = (struct ospf_iface *) (sk->data);
struct proto *p = (struct proto *) (ifa->proto); struct proto *p = (struct proto *) (ifa->proto);
struct ospf_neighbor *n; struct ospf_neighbor *n;
int osize;
char *mesg = "Bad OSPF packet from "; char *mesg = "Bad OSPF packet from ";
if (ifa->stub) if (ifa->stub)
@ -93,6 +94,7 @@ ospf_rx_hook(sock * sk, int size)
DBG("%s: RX_Hook called on interface %s.\n", p->name, sk->iface->name); DBG("%s: RX_Hook called on interface %s.\n", p->name, sk->iface->name);
ps = (struct ospf_packet *) ipv4_skip_header(sk->rbuf, &size); ps = (struct ospf_packet *) ipv4_skip_header(sk->rbuf, &size);
osize = ntohs(ps->length);
if (ps == NULL) if (ps == NULL)
{ {
log(L_ERR "%s%I - bad IP header", mesg, sk->faddr); log(L_ERR "%s%I - bad IP header", mesg, sk->faddr);
@ -105,9 +107,9 @@ ospf_rx_hook(sock * sk, int size)
return 1; return 1;
} }
if ((ntohs(ps->length) != size) || (size != (4 * (size / 4)))) if ((osize > size) || (osize != (4 * (osize / 4))))
{ {
log(L_ERR "%s%I - size field does not match", mesg, sk->faddr); log(L_ERR "%s%I - size field does not match (%d/%d)", mesg, sk->faddr, ntohs(ps->length), size );
return 1; return 1;
} }