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authorTimo Teräs <timo.teras@iki.fi>2013-06-27 10:27:05 +0300
committerDavid S. Miller <davem@davemloft.net>2013-06-28 21:27:47 -0700
commit2ffae99d1fac272952b5a395759823717760ce37 (patch)
tree0c1cd0ea84fa58072e0eef58a0d8507567c6d785 /include/net/ip_fib.h
parentb173ee488dcc545e77ed482158a2f0d06d7a5860 (diff)
downloadlwn-2ffae99d1fac272952b5a395759823717760ce37.tar.gz
lwn-2ffae99d1fac272952b5a395759823717760ce37.zip
ipv4: use next hop exceptions also for input routes
Commit d2d68ba9 (ipv4: Cache input routes in fib_info nexthops) assmued that "locally destined, and routed packets, never trigger PMTU events or redirects that will be processed by us". However, it seems that tunnel devices do trigger PMTU events in certain cases. At least ip_gre, ip6_gre, sit, and ipip do use the inner flow's skb_dst(skb)->ops->update_pmtu to propage mtu information from the outer flows. These can cause the inner flow mtu to be decreased. If next hop exceptions are not consulted for pmtu, IP fragmentation will not be done properly for these routes. It also seems that we really need to have the PMTU information always for netfilter TCPMSS clamp-to-pmtu feature to work properly. So for the time being, cache separate copies of input routes for each next hop exception. Signed-off-by: Timo Teräs <timo.teras@iki.fi> Reviewed-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip_fib.h')
-rw-r--r--include/net/ip_fib.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 44424e9dab2a..aac85534d7b5 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -56,7 +56,8 @@ struct fib_nh_exception {
u32 fnhe_pmtu;
__be32 fnhe_gw;
unsigned long fnhe_expires;
- struct rtable __rcu *fnhe_rth;
+ struct rtable __rcu *fnhe_rth_input;
+ struct rtable __rcu *fnhe_rth_output;
unsigned long fnhe_stamp;
};