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Adds warning for mismatch MTU in OSPF packets.

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Thanks Alexander V. Chernikov for the original patch.
This commit is contained in:
Ondrej Zajicek 2012-03-15 13:45:55 +01:00
parent 2f9955b5d5
commit 9f1500f50a
1 changed files with 9 additions and 2 deletions
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11
proto/ospf/dbdes.c
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@ -96,7 +96,7 @@ ospf_dbdes_send(struct ospf_neighbor *n, int next)
pkt = ospf_tx_buffer(ifa); pkt = ospf_tx_buffer(ifa);
op = &pkt->ospf_packet; op = &pkt->ospf_packet;
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P); ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = htons(ifa->iface->mtu); pkt->iface_mtu = (ifa->type == OSPF_IT_VLINK) ? 0 : htons(ifa->iface->mtu);
pkt->options = hton_opt(oa->options); pkt->options = hton_opt(oa->options);
pkt->imms = n->myimms; pkt->imms = n->myimms;
pkt->ddseq = htonl(n->dds); pkt->ddseq = htonl(n->dds);
@ -119,7 +119,7 @@ ospf_dbdes_send(struct ospf_neighbor *n, int next)
op = (struct ospf_packet *) pkt; op = (struct ospf_packet *) pkt;
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P); ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = htons(ifa->iface->mtu); pkt->iface_mtu = (ifa->type == OSPF_IT_VLINK) ? 0 : htons(ifa->iface->mtu);
pkt->ddseq = htonl(n->dds); pkt->ddseq = htonl(n->dds);
pkt->options = hton_opt(oa->options); pkt->options = hton_opt(oa->options);
@ -260,6 +260,7 @@ ospf_dbdes_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
struct ospf_dbdes_packet *ps = (void *) ps_i; struct ospf_dbdes_packet *ps = (void *) ps_i;
u32 ps_ddseq = ntohl(ps->ddseq); u32 ps_ddseq = ntohl(ps->ddseq);
u32 ps_options = ntoh_opt(ps->options); u32 ps_options = ntoh_opt(ps->options);
u16 ps_iface_mtu = ntohs(ps->iface_mtu);
OSPF_PACKET(ospf_dump_dbdes, ps, "DBDES packet received from %I via %s", n->ip, ifa->iface->name); OSPF_PACKET(ospf_dump_dbdes, ps, "DBDES packet received from %I via %s", n->ip, ifa->iface->name);
@ -277,6 +278,12 @@ ospf_dbdes_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
if (n->state != NEIGHBOR_EXSTART) if (n->state != NEIGHBOR_EXSTART)
return; return;
case NEIGHBOR_EXSTART: case NEIGHBOR_EXSTART:
if ((ps_iface_mtu != ifa->iface->mtu) && (ifa->type != OSPF_IT_VLINK)
&& (ps_iface_mtu != 0) && (ifa->iface->mtu != 0))
log(L_WARN "OSPF: MTU mismatch with neighbour %I on interface %s (remote %d, local %d)",
n->ip, ifa->iface->name, ps_iface_mtu, ifa->iface->mtu);
if ((ps->imms.bit.m && ps->imms.bit.ms && ps->imms.bit.i) if ((ps->imms.bit.m && ps->imms.bit.ms && ps->imms.bit.i)
&& (n->rid > po->router_id) && (size == sizeof(struct ospf_dbdes_packet))) && (n->rid > po->router_id) && (size == sizeof(struct ospf_dbdes_packet)))
{ {