Jerry/bird
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

OSPF: Reject duplicate DBDES packets after dead interval

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

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;
}
@ -457,7 +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;

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);