OSPF: Reject DBDES packets with non-matching MTU (267da813) · Commits · 戴 / Bird

proto/ospf/dbdes.c

+10 −7

Original line number	Diff line number	Diff line
		@@ -342,6 +342,16 @@ 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);
		return;
		}

		switch (n->state)
		{
		case NEIGHBOR_DOWN:
		@@ -357,13 +367,6 @@ 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)))