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ipv6: rate-limit probes for neighbourless routes

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When commit 270972554c ("[IPV6]: ROUTE: Add Router Reachability
Probing (RFC4191).") introduced router probing, the rt6_probe() function
required that a neighbour entry existed. This neighbour entry is used to
record the timestamp of the last probe via the ->updated field.

Later, commit 2152caea71 ("ipv6: Do not depend on rt->n in rt6_probe().")
removed the requirement for a neighbour entry. Neighbourless routes skip
the interval check and are not rate-limited.

This patch adds rate-limiting for neighbourless routes, by recording the
timestamp of the last probe in the fib6_info itself.

Fixes: 2152caea71 ("ipv6: Do not depend on rt->n in rt6_probe().")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sabrina Dubroca
2018-10-12 16:22:47 +02:00
committed by David S. Miller
parent 64bd9c8135
commit f547fac624
2 changed files with 10 additions and 6 deletions
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4
include/net/ip6_fib.h
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@@ -159,6 +159,10 @@ struct fib6_info {
struct rt6_info * __percpu *rt6i_pcpu;
struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
#ifdef CONFIG_IPV6_ROUTER_PREF
unsigned long last_probe;
#endif
u32 fib6_metric;
u8 fib6_protocol;
u8 fib6_type;