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Sascha Hlusiak 8945a808f7 sit: allow ip fragmentation when using nopmtudisc to fix package loss 
if tunnel parameters have frag_off set to IP_DF, pmtudisc on the ipv4 link
will be performed by deriving the mtu from the ipv4 link and setting the
DF-Flag of the encapsulating IPv4 Header. If fragmentation is needed on the
way, the IPv4 pmtu gets adjusted, the ipv6 package will be resent eventually,
using the new and lower mtu and everyone is happy.

If the frag_off parameter is unset, the mtu for the tunnel will be derived
from the tunnel device or the ipv6 pmtu, which might be higher than the ipv4
pmtu. In that case we must allow the fragmentation of the IPv4 packet because
the IPv6 mtu wouldn't 'learn' from the adjusted IPv4 pmtu, resulting in
frequent icmp_frag_needed and package loss on the IPv6 layer.

This patch allows fragmentation when tunnel was created with parameter
nopmtudisc, like in ipip/gre tunnels.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-08-28 23:53:53 -07:00
..
9p 9p: Possible regression in p9_client_stat 2009-07-14 15:54:41 -05:00
802 net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
8021q vlan: adds fcoe offload related net_device_ops and updates fcoe_ddp_xid field 2009-08-14 16:12:06 -07:00
appletalk Use correct NET_RX_* returns for atalk_rcv() 2009-08-12 20:44:50 -07:00
atm net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
ax25 net: Move rx skb_orphan call to where needed 2009-06-23 16:36:25 -07:00
bluetooth Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
bridge net/bridge: Add 'hairpin' port forwarding mode 2009-08-13 16:26:11 -07:00
can can: Use WARN_ONCE() instead of BUG_ON() for sanity check in receive path 2009-08-14 16:36:57 -07:00
core pktgen: use proc_create_data() 2009-08-28 23:41:43 -07:00
dcb
dccp Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
decnet net: remove NET_RX_BAD and NET_RX_CN* defines 2009-07-05 19:15:35 -07:00
dsa dsa: fix 88e6xxx statistics counter snapshotting 2009-07-05 18:03:35 -07:00
econet Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
ethernet net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
ieee802154 Drop ARPHRD_IEEE802154_PHY 2009-08-19 23:08:24 +04:00
ipv4 net: ip_rt_send_redirect() optimization 2009-08-28 23:52:01 -07:00
ipv6 sit: allow ip fragmentation when using nopmtudisc to fix package loss 2009-08-28 23:53:53 -07:00
ipx headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
irda Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
iucv net: adding memory barrier to the poll and receive callbacks 2009-07-09 17:06:57 -07:00
key net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
lapb net: remove NET_RX_BAD and NET_RX_CN* defines 2009-07-05 19:15:35 -07:00
llc net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
mac80211 mac80211: Check pending scan request after having processed mgd work 2009-08-28 14:40:46 -04:00
netfilter net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
netlabel Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-07-30 19:22:43 -07:00
netlink net/compat/wext: send different messages to compat tasks 2009-07-15 08:53:39 -07:00
netrom Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
packet af_packet: style cleanups 2009-07-23 18:01:10 -07:00
phonet phonet: fix build when PROC_FS is disabled 2009-08-17 17:48:25 -07:00
rds RDS: Add a debug message suggesting to load transport modules 2009-08-23 19:13:14 -07:00
rfkill rfkill: add the GPS radio type 2009-08-04 16:44:23 -04:00
rose Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
rxrpc net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
sched net: Avoid enqueuing skb for default qdiscs 2009-08-06 20:10:18 -07:00
sctp Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
sunrpc headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
tipc genetlink: make netns aware 2009-07-12 14:03:27 -07:00
unix net: adding memory barrier to the poll and receive callbacks 2009-07-09 17:06:57 -07:00
wanrouter headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
wimax wimax: fix warning caused by not checking retval of rfkill_set_hw_state() 2009-06-11 11:12:48 -07:00
wireless nl80211: jump to out_err upon unsupported iftype 2009-08-28 14:40:41 -04:00
x25 headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
xfrm Fix xfrm hash collisions by changing __xfrm4_daddr_saddr_hash to hash addresses with addition 2009-08-09 21:45:31 -07:00
compat.c net/compat/wext: send different messages to compat tasks 2009-07-15 08:53:39 -07:00
Kconfig net/compat/wext: send different messages to compat tasks 2009-07-15 08:53:39 -07:00
Makefile net: remove redundant sched/ in net/Makefile 2009-07-12 20:11:14 -07:00
nonet.c
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-04-06 18:05:43 -07:00
sysctl_net.c net: sysctl_net - use net_eq to compare nets 2009-03-16 16:23:30 +01:00
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