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OSPF: Reject duplicate DBDES packets after dead interval

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Master may free last DBDES packet immediately. Slave must wait dead
interval before freeing last DBDES packet and then reject duplicate
DBDES packets with SeqNumberMismatch.
This commit is contained in:
Ondrej Zajicek (work) 2019-02-03 17:31:27 +01:00
parent 9c94583a3d
commit 16605f2fda
3 changed files with 20 additions and 0 deletions
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13
proto/ospf/dbdes.c
View file

@ -238,6 +238,14 @@ ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n)
ospf_do_send_dbdes(p, n);
}
void
ospf_reset_ldd(struct ospf_proto *p UNUSED, struct ospf_neighbor *n)
{
mb_free(n->ldd_buffer);
n->ldd_buffer = NULL;
n->ldd_bsize = 0;
}
static int
ospf_process_dbdes(struct ospf_proto *p, struct ospf_packet *pkt, struct ospf_neighbor *n)
{
@ -434,6 +442,7 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
{
tm_stop(n->dbdes_timer);
ospf_reset_ldd(p, n);
ospf_neigh_sm(n, INM_EXDONE);
break;
}
@ -457,8 +466,12 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
ospf_send_dbdes(p, n);
if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
{
/* Use dbdes timer to postpone freeing of Last DBDES packet buffer */
tm_start(n->dbdes_timer, n->ifa->deadint S);
ospf_neigh_sm(n, INM_EXDONE);
}
}
break;
case NEIGHBOR_LOADING:

6
proto/ospf/neighbor.c
View file

@ -608,6 +608,12 @@ dbdes_timer_hook(timer *t)
if ((n->state == NEIGHBOR_EXCHANGE) && (n->myimms & DBDES_MS))
ospf_rxmt_dbdes(p, n);
if ((n->state > NEIGHBOR_LOADING) && !(n->myimms & DBDES_MS))
{
ospf_reset_ldd(p, n);
tm_stop(n->dbdes_timer);
}
}
static void

1
proto/ospf/ospf.h
View file

@ -1041,6 +1041,7 @@ uint ospf_hello3_options(struct ospf_packet *pkt);
/* dbdes.c */
void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
uint ospf_dbdes3_options(struct ospf_packet *pkt);