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ipv6: Limit mtu to 65575 bytes

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Francois reported that setting big mtu on loopback device could prevent
tcp sessions making progress.

We do not support (yet ?) IPv6 Jumbograms and cook corrupted packets.

We must limit the IPv6 MTU to (65535 + 40) bytes in theory.

Tested:

ifconfig lo mtu 70000
netperf -H ::1

Before patch : Throughput :   0.05 Mbits

After patch : Throughput : 35484 Mbits

Reported-by: Francois WELLENREITER <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: YOSHIFUJI Hideaki <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2014-04-10 21:23:36 -07:00 • committed by David S. Miller
commit 30f78d8ebf
2 changed files with 8 additions and 2 deletions
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5
net/ipv6/route.c
View file

@ -1338,7 +1338,7 @@ static unsigned int ip6_mtu(const struct dst_entry *dst)
unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
if (mtu)
return mtu;
goto out;
mtu = IPV6_MIN_MTU;
@ -1348,7 +1348,8 @@ static unsigned int ip6_mtu(const struct dst_entry *dst)
mtu = idev->cnf.mtu6;
rcu_read_unlock();
return mtu;
out:
return min_t(unsigned int, mtu, IP6_MAX_MTU);
}
static struct dst_entry *icmp6_dst_gc_list;