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Babel: Send out low-interval hello on shutdown

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When shutting down a Babel instance we send a wildcard retraction to make
sure all peers can quickly switch to other route origins. Add another small
optimisation borrowed from babeld: sending a Hello message (along with the
retraction) with a very low interval.

This will cause neighbours to modify their expiry timers for the node's
state to quickly time it out, thus conserving resources in the network.
This commit is contained in:
Toke Høiland-Jørgensen 2022-04-22 16:41:52 +02:00 committed by Ondrej Zajicek (work)
parent 9eec503b25
commit 4aef70136d
1 changed files with 9 additions and 4 deletions
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13
proto/babel/babel.c
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@ -842,14 +842,14 @@ babel_send_ihus(struct babel_iface *ifa)
}
static void
babel_send_hello(struct babel_iface *ifa)
babel_send_hello(struct babel_iface *ifa, uint interval)
{
struct babel_proto *p = ifa->proto;
union babel_msg msg = {};
msg.type = BABEL_TLV_HELLO;
msg.hello.seqno = ifa->hello_seqno++;
msg.hello.interval = ifa->cf->hello_interval;
msg.hello.interval = interval ?: ifa->cf->hello_interval;
TRACE(D_PACKETS, "Sending hello on %s with seqno %d interval %t",
ifa->ifname, msg.hello.seqno, (btime) msg.hello.interval);
@ -1557,7 +1557,7 @@ babel_iface_timer(timer *t)
if (now_ >= ifa->next_hello)
{
babel_send_hello(ifa);
babel_send_hello(ifa, 0);
ifa->next_hello += hello_period * (1 + (now_ - ifa->next_hello) / hello_period);
}
@ -1604,7 +1604,7 @@ babel_iface_start(struct babel_iface *ifa)
tm_start(ifa->timer, 100 MS);
ifa->up = 1;
babel_send_hello(ifa);
babel_send_hello(ifa, 0);
babel_send_wildcard_retraction(ifa);
babel_send_wildcard_request(ifa);
babel_send_update(ifa, 0); /* Full update */
@ -2417,6 +2417,11 @@ babel_iface_shutdown(struct babel_iface *ifa)
{
if (ifa->sk)
{
/*
* Retract all our routes and lower the hello interval so peers' neighbour
* state expires quickly
*/
babel_send_hello(ifa, BABEL_MIN_INTERVAL);
babel_send_wildcard_retraction(ifa);
babel_send_queue(ifa);
}