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.
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3 changed files with 20 additions and 0 deletions
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@ -238,6 +238,14 @@ ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n)
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ospf_do_send_dbdes(p, n);
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}
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void
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ospf_reset_ldd(struct ospf_proto *p UNUSED, struct ospf_neighbor *n)
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{
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mb_free(n->ldd_buffer);
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n->ldd_buffer = NULL;
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n->ldd_bsize = 0;
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}
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static int
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ospf_process_dbdes(struct ospf_proto *p, struct ospf_packet *pkt, struct ospf_neighbor *n)
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{
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@ -434,6 +442,7 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
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if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
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{
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tm_stop(n->dbdes_timer);
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ospf_reset_ldd(p, n);
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ospf_neigh_sm(n, INM_EXDONE);
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break;
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}
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@ -457,7 +466,11 @@ ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa,
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ospf_send_dbdes(p, n);
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if (!(n->myimms & DBDES_M) && !(n->imms & DBDES_M))
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{
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/* Use dbdes timer to postpone freeing of Last DBDES packet buffer */
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tm_start(n->dbdes_timer, n->ifa->deadint S);
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ospf_neigh_sm(n, INM_EXDONE);
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}
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}
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break;
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@ -608,6 +608,12 @@ dbdes_timer_hook(timer *t)
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if ((n->state == NEIGHBOR_EXCHANGE) && (n->myimms & DBDES_MS))
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ospf_rxmt_dbdes(p, n);
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if ((n->state > NEIGHBOR_LOADING) && !(n->myimms & DBDES_MS))
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{
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ospf_reset_ldd(p, n);
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tm_stop(n->dbdes_timer);
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}
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}
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static void
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@ -1041,6 +1041,7 @@ uint ospf_hello3_options(struct ospf_packet *pkt);
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/* dbdes.c */
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void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
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uint ospf_dbdes3_options(struct ospf_packet *pkt);
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