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ipv4: Namespecify TCP PMTU mechanism

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Packetization Layer Path MTU Discovery works separately beside
Path MTU Discovery at IP level, different net namespace has
various requirements on which one to chose, e.g., a virutalized
container instance would require TCP PMTU to probe an usable
effective mtu for underlying tunnel, while the host would
employ classical ICMP based PMTU to function.

Hence making TCP PMTU mechanism per net namespace to decouple
two functionality. Furthermore the probe base MSS should also
be configured separately for each namespace.

Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Fan Du 2015-02-10 09:53:16 +08:00 • committed by David S. Miller
parent f217d6ca4a
commit b0f9ca53cb
6 changed files with 25 additions and 23 deletions
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1
net/ipv4/tcp_ipv4.c
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@ -2459,6 +2459,7 @@ static int __net_init tcp_sk_init(struct net *net)
*per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk;
}
net->ipv4.sysctl_tcp_ecn = 2;
net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS;
return 0;
fail: