Commit 16605f2f authored by Ondřej Zajíček's avatar Ondřej Zajíček

OSPF: Reject duplicate DBDES packets after dead interval

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.
parent 9c94583a
......@@ -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;
}
......@@ -457,7 +466,11 @@ 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;
......
......@@ -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
......
......@@ -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);
......
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