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OSPF: Reject DBDES packets with non-matching MTU

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As it is specified in RFC 2328. The old code just provided warning.
This commit is contained in:
Ondrej Zajicek (work) 2019-02-03 21:27:02 +01:00
parent ccee5a863e
commit 2bbd72863f
1 changed files with 11 additions and 7 deletions
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18
proto/ospf/dbdes.c
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@ -340,6 +340,17 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
rcv_ddseq = ntohl(ps->ddseq);
}
/* Reject packets with non-matching MTU */
if ((ifa->type != OSPF_IT_VLINK) &&
(rcv_iface_mtu != ifa->iface->mtu) &&
(rcv_iface_mtu != 0) && (ifa->iface->mtu != 0))
{
LOG_PKT("MTU mismatch with nbr %R on %s (remote %d, local %d)",
n->rid, ifa->ifname, rcv_iface_mtu, ifa->iface->mtu);
STATS2(bad_dbdes, dropped);
return;
}
switch (n->state)
{
case NEIGHBOR_DOWN:
@ -355,13 +366,6 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
/* fallthrough */
case NEIGHBOR_EXSTART:
if ((ifa->type != OSPF_IT_VLINK) &&
(rcv_iface_mtu != ifa->iface->mtu) &&
(rcv_iface_mtu != 0) &&
(ifa->iface->mtu != 0))
LOG_PKT_WARN("MTU mismatch with nbr %R on %s (remote %d, local %d)",
n->rid, ifa->ifname, rcv_iface_mtu, ifa->iface->mtu);
if (((rcv_imms & DBDES_IMMS) == DBDES_IMMS) &&
(n->rid > p->router_id) &&
(plen == ospf_dbdes_hdrlen(p)))