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alistair23-linux/net/ipv4
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Patrick McHardy 5f2d04f1f9 ipv4: fix path MTU discovery with connection tracking 
IPv4 conntrack defragments incoming packet at the PRE_ROUTING hook and
(in case of forwarded packets) refragments them at POST_ROUTING
independent of the IP_DF flag. Refragmentation uses the dst_mtu() of
the local route without caring about the original fragment sizes,
thereby breaking PMTUD.

This patch fixes this by keeping track of the largest received fragment
with IP_DF set and generates an ICMP fragmentation required error during
refragmentation if that size exceeds the MTU.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
2012-08-26 19:13:55 +02:00
..
netfilter Merge git://1984.lsi.us.es/nf-next 2012-08-22 18:48:52 -07:00
af_inet.c net: tcp: GRO should be ECN friendly 2012-08-06 13:40:47 -07:00
ah4.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
arp.c ipv4: Fix input route performance regression. 2012-07-26 15:50:39 -07:00
cipso_ipv4.c cipso: don't follow a NULL pointer when setsockopt() is called 2012-07-18 09:01:12 -07:00
datagram.c
devinet.c net: remove delay at device dismantle 2012-08-22 21:50:36 -07:00
esp4.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
fib_frontend.c net: remove delay at device dismantle 2012-08-22 21:50:36 -07:00
fib_lookup.h
fib_rules.c ipv4: Don't store a rule pointer in fib_result. 2012-07-13 08:21:29 -07:00
fib_semantics.c ipv4: Cache routes in nexthop exception entries. 2012-07-31 15:02:02 -07:00
fib_trie.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-08-22 14:21:38 -07:00
gre.c
icmp.c ipv4: Prepare for change of rt->rt_iif encoding. 2012-07-23 16:36:26 -07:00
igmp.c time: jiffies_delta_to_clock_t() helper to the rescue 2012-08-09 16:17:03 -07:00
inet_connection_sock.c ipv4: Use newinet->inet_opt in inet_csk_route_child_sock() 2012-08-21 14:49:11 -07:00
inet_diag.c net: make sock diag per-namespace 2012-07-16 22:31:34 -07:00
inet_fragment.c
inet_hashtables.c
inet_lro.c
inet_timewait_sock.c
inetpeer.c ipv4: Maintain redirect and PMTU info in struct rtable again. 2012-07-10 22:40:14 -07:00
ip_forward.c
ip_fragment.c ipv4: fix path MTU discovery with connection tracking 2012-08-26 19:13:55 +02:00
ip_gre.c ipv4: Adjust semantics of rt->rt_gateway. 2012-07-20 13:31:20 -07:00
ip_input.c net: TCP early demux cleanup 2012-07-30 14:53:21 -07:00
ip_options.c ipv4: optimize fib_compute_spec_dst call in ip_options_echo 2012-07-19 08:30:49 -07:00
ip_output.c ipv4: fix path MTU discovery with connection tracking 2012-08-26 19:13:55 +02:00
ip_sockglue.c ipv4: Prepare for change of rt->rt_iif encoding. 2012-07-23 16:36:26 -07:00
ip_vti.c net/ipv4/ip_vti.c: Fix __rcu warnings detected by sparse. 2012-07-23 13:00:54 -07:00
ipcomp.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
ipconfig.c
ipip.c ipv4: Adjust semantics of rt->rt_gateway. 2012-07-20 13:31:20 -07:00
ipmr.c net: Loopback ifindex is constant now 2012-08-09 16:18:07 -07:00
Kconfig net/ipv4: VTI support new module for ip_vti. 2012-07-18 09:36:12 -07:00
Makefile memcg: rename config variables 2012-07-31 18:42:43 -07:00
netfilter.c
ping.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
proc.c net-tcp: Fast Open client - sending SYN-data 2012-07-19 11:02:03 -07:00
protocol.c
raw.c ipv4: Add redirect support to all protocol icmp error handlers. 2012-07-11 21:27:49 -07:00
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-08-22 14:21:38 -07:00
syncookies.c net-tcp: Fast Open base 2012-07-19 10:55:36 -07:00
sysctl_net_ipv4.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
tcp.c tcp: Apply device TSO segment limit earlier 2012-08-02 00:19:17 -07:00
tcp_bic.c
tcp_cong.c tcp: Apply device TSO segment limit earlier 2012-08-02 00:19:17 -07:00
tcp_cubic.c
tcp_diag.c
tcp_fastopen.c net-tcp: Fast Open base 2012-07-19 10:55:36 -07:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-08-22 14:21:38 -07:00
tcp_ipv4.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-08-22 14:21:38 -07:00
tcp_lp.c
tcp_memcontrol.c
tcp_metrics.c tcp: must free metrics at net dismantle 2012-08-09 02:31:37 -07:00
tcp_minisocks.c net: tcp: move sk_rx_dst_set call after tcp_create_openreq_child() 2012-08-20 03:03:33 -07:00
tcp_output.c tcp: fix possible socket refcount problem 2012-08-21 14:42:23 -07:00
tcp_probe.c
tcp_scalable.c
tcp_timer.c tcp: fix possible socket refcount problem 2012-08-21 14:42:23 -07:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c
udp.c ipv4: fix ip_send_skb() 2012-08-10 14:08:57 -07:00
udp_diag.c net: make sock diag per-namespace 2012-07-16 22:31:34 -07:00
udp_impl.h
udplite.c
xfrm4_input.c ipv4: Fix input route performance regression. 2012-07-26 15:50:39 -07:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c net/ipv4: VTI support rx-path hook in xfrm4_mode_tunnel. 2012-07-18 09:36:12 -07:00
xfrm4_output.c
xfrm4_policy.c ipv4: Properly purge netdev references on uncached routes. 2012-07-31 15:06:50 -07:00
xfrm4_state.c
xfrm4_tunnel.c