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RIP: Improvements to demand circuit mode

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Restart iface after changing demand circuit mode during reconfiguration.
Fix next_regular interval reset during reconfiguration. Send flushing
response when iface goes down.
This commit is contained in:
Ondrej Zajicek (work) 2020-03-14 17:04:49 +01:00
parent dc042d87cb
commit d516c68ad8
3 changed files with 51 additions and 4 deletions
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19
proto/rip/packets.c
View File

@ -780,6 +780,25 @@ rip_receive_response(struct rip_proto *p, struct rip_iface *ifa, struct rip_pack
}
}
int
rip_send_flush(struct rip_proto *p, struct rip_iface *ifa)
{
/* Caller should handle cleanup of pending response */
if (ifa->tx_pending)
return 0;
struct rip_packet *pkt = rip_tx_buffer(ifa);
rip_fill_header(ifa, pkt, RIP_CMD_UPDATE_RESPONSE);
rip_fill_update_hdr(pkt, 1, ifa->tx_seqnum);
/* We suppose that iface is going down, so we do not expect ACK */
ifa->tx_seqnum++;
TRACE(D_PACKETS, "Sending response via %s", ifa->iface->name);
return rip_send_to(p, ifa, pkt, rip_pkt_hdrlen(ifa), ifa->tx_addr);
}
static int
rip_send_ack(struct rip_proto *p, struct rip_iface *ifa, uint flush, uint seqnum)

33
proto/rip/rip.c
View File

@ -550,9 +550,15 @@ rip_iface_stop(struct rip_iface *ifa)
ifa->next_triggered = 0;
ifa->want_triggered = 0;
if (ifa->tx_pending)
ifa->tx_seqnum++;
ifa->tx_pending = 0;
ifa->req_pending = 0;
if (ifa->cf->demand_circuit)
rip_send_flush(p, ifa);
WALK_LIST_FIRST(n, ifa->neigh_list)
rip_remove_neighbor(p, n);
@ -710,7 +716,8 @@ rip_reconfigure_iface(struct rip_proto *p, struct rip_iface *ifa, struct rip_ifa
(new->port != old->port) ||
(new->tx_tos != old->tx_tos) ||
(new->tx_priority != old->tx_priority) ||
(new->ttl_security != old->ttl_security))
(new->ttl_security != old->ttl_security) ||
(new->demand_circuit != old->demand_circuit))
return 0;
TRACE(D_EVENTS, "Reconfiguring interface %s", ifa->iface->name);
@ -719,7 +726,8 @@ rip_reconfigure_iface(struct rip_proto *p, struct rip_iface *ifa, struct rip_ifa
rip_iface_update_buffers(ifa);
if (ifa->next_regular > (current_time() + new->update_time))
if ((! ifa->cf->demand_circuit) &&
(ifa->next_regular > (current_time() + new->update_time)))
ifa->next_regular = current_time() + (random() % new->update_time) + 100 MS;
if (new->check_link != old->check_link)
@ -1130,6 +1138,20 @@ rip_start(struct proto *P)
return PS_UP;
}
static int
rip_shutdown(struct proto *P)
{
struct rip_proto *p = (void *) P;
TRACE(D_EVENTS, "Shutdown requested");
struct rip_iface *ifa;
WALK_LIST(ifa, p->iface_list)
rip_iface_stop(ifa);
return PS_DOWN;
}
static int
rip_reconfigure(struct proto *P, struct proto_config *CF)
{
@ -1271,8 +1293,12 @@ rip_dump(struct proto *P)
FIB_WALK(&p->rtable, struct rip_entry, en)
{
debug("RIP: entry #%d: %N via %I dev %s valid %d metric %d age %t\n",
i++, en->n.addr, en->next_hop, en->iface->name,
i++, en->n.addr, en->next_hop, en->iface ? en->iface->name : "(null)",
en->valid, en->metric, current_time() - en->changed);
for (struct rip_rte *e = en->routes; e; e = e->next)
debug("RIP: via %I metric %d expires %t\n",
e->next_hop, e->metric, e->expires - current_time());
}
FIB_WALK_END;
@ -1298,6 +1324,7 @@ struct protocol proto_rip = {
.init = rip_init,
.dump = rip_dump,
.start = rip_start,
.shutdown = rip_shutdown,
.reconfigure = rip_reconfigure,
.get_route_info = rip_get_route_info,
.get_attr = rip_get_attr

3
proto/rip/rip.h
View File

@ -162,7 +162,7 @@ struct rip_entry
u8 valid; /* Entry validity state (RIP_ENTRY_*) */
u8 metric; /* Outgoing route metric */
u16 tag; /* Outgoing route tag */
struct iface *from; /* Outgoing route from, NULL if from proto */
struct iface *from; /* Outgoing route from, NULL if from proto */
struct iface *iface; /* Outgoing route iface (for next hop) */
ip_addr next_hop; /* Outgoing route next hop */
@ -227,6 +227,7 @@ void rip_show_neighbors(struct proto *P, char *iff);
/* packets.c */
void rip_send_request(struct rip_proto *p, struct rip_iface *ifa);
void rip_send_table(struct rip_proto *p, struct rip_iface *ifa, ip_addr addr, btime changed);
int rip_send_flush(struct rip_proto *p, struct rip_iface *ifa);
void rip_rxmt_timeout(timer *t);
int rip_open_socket(struct rip_iface *ifa);