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ipv4: Fix flushing of cached routing informations
Currently we can not flush cached pmtu/redirect informations via the ipv4_sysctl_rtcache_flush sysctl. We need to check the rt_genid of the old route and reset the nh exeption if the old route is expired when we bind a new route to a nh exeption. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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18c22a03a2
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13d82bf50d
1 changed files with 6 additions and 3 deletions
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@ -1163,8 +1163,12 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
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spin_lock_bh(&fnhe_lock);
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if (daddr == fnhe->fnhe_daddr) {
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struct rtable *orig;
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struct rtable *orig = rcu_dereference(fnhe->fnhe_rth);
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if (orig && rt_is_expired(orig)) {
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fnhe->fnhe_gw = 0;
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fnhe->fnhe_pmtu = 0;
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fnhe->fnhe_expires = 0;
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}
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if (fnhe->fnhe_pmtu) {
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unsigned long expires = fnhe->fnhe_expires;
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unsigned long diff = expires - jiffies;
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@ -1181,7 +1185,6 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
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} else if (!rt->rt_gateway)
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rt->rt_gateway = daddr;
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orig = rcu_dereference(fnhe->fnhe_rth);
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rcu_assign_pointer(fnhe->fnhe_rth, rt);
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if (orig)
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rt_free(orig);
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