Herbert Xu 23ca0c989e ipip: Fix handling of DF packets when pmtudisc is OFF ... RFC 2003 requires the outer header to have DF set if DF is set on the inner header, even when PMTU discovery is off for the tunnel. Our implementation does exactly that. For this to work properly the IPIP gateway also needs to engate in PMTU when the inner DF bit is set. As otherwise the original host would not be able to carry out its PMTU successfully since part of the path is only visible to the gateway. Unfortunately when the tunnel PMTU discovery setting is off, we do not collect the necessary soft state, resulting in blackholes when the original host tries to perform PMTU discovery. This problem is not reproducible on the IPIP gateway itself as the inner packet usually has skb->local_df set. This is not correctly cleared (an unrelated bug) when the packet passes through the tunnel, which allows fragmentation to occur. For hosts behind the IPIP gateway it is readily visible with a simple ping. This patch fixes the problem by performing PMTU discovery for all packets with the inner DF bit set, regardless of the PMTU discovery setting on the tunnel itself. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>		2009-11-06 20:33:40 -08:00
..
netfilter	netfilter: nf_nat: fix NAT issue in 2.6.30.4+	2009-11-06 00:43:42 -08:00
af_inet.c	net: Use sk_mark for routing lookup in more places	2009-10-01 15:16:49 -07:00
ah4.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
arp.c	net: make neigh_ops constant	2009-09-01 17:40:57 -07:00
cipso_ipv4.c	netlabel: Label incoming TCP connections correctly in SELinux	2009-03-28 15:01:36 +11:00
datagram.c	mib: add net to IP_INC_STATS_BH	2008-07-16 20:20:11 -07:00
devinet.c	ipv4: arp_notify address list bug	2009-10-07 03:18:17 -07:00
esp4.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
fib_frontend.c	net: Fix RPF to work with policy routing	2009-10-29 22:49:12 -07:00
fib_hash.c	ipv4: cleanup - remove two unused parameters from fib_semantic_match().	2009-05-18 15:16:37 -07:00
fib_lookup.h	ipv4: cleanup - remove two unused parameters from fib_semantic_match().	2009-05-18 15:16:37 -07:00
fib_rules.c	net: Remove unused parameter from fill method in fib_rules_ops.	2009-05-20 17:26:23 -07:00
fib_semantics.c	ipv4: cleanup - remove two unused parameters from fib_semantic_match().	2009-05-18 15:16:37 -07:00
fib_trie.c	fib_trie: resize rework	2009-08-28 23:57:15 -07:00
icmp.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
igmp.c	bonding: remap muticast addresses without using dev_close() and dev_open()	2009-09-15 02:37:40 -07:00
inet_connection_sock.c	tcp: reduce SYN-ACK retrans for TCP_DEFER_ACCEPT	2009-10-19 19:19:03 -07:00
inet_diag.c	net: correct off-by-one write allocations reports	2009-06-18 00:29:12 -07:00
inet_fragment.c	inet fragments: fix sparse warning: context imbalance	2009-02-26 23:13:35 -08:00
inet_hashtables.c	net: move bsockets outside of read only beginning of struct inet_hashinfo	2009-02-01 12:31:33 -08:00
inet_lro.c	include/net net/ - csum_partial - remove unnecessary casts	2008-11-19 15:44:53 -08:00
inet_timewait_sock.c	tcp: fix premature termination of FIN_WAIT2 time-wait sockets	2009-08-29 00:00:35 -07:00
inetpeer.c	net: clean up net/ipv4/ah4.c esp4.c fib_semantics.c inet_connection_sock.c inetpeer.c ip_output.c	2008-11-03 00:23:42 -08:00
ip_forward.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
ip_fragment.c	ipv4: Use frag list abstraction interfaces.	2009-06-09 00:19:37 -07:00
ip_gre.c	gre: Fix dev_addr clobbering for gretap	2009-10-30 12:28:07 -07:00
ip_input.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
ip_options.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
ip_output.c	net: Use sk_mark for routing lookup in more places	2009-10-01 15:16:49 -07:00
ip_sockglue.c	net: Fix IP_MULTICAST_IF	2009-10-19 21:34:20 -07:00
ipcomp.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
ipconfig.c	ipv4: teach ipconfig about the MTU option in DHCP	2009-05-19 15:36:17 -07:00
ipip.c	ipip: Fix handling of DF packets when pmtudisc is OFF	2009-11-06 20:33:40 -08:00
ipmr.c	net: Make setsockopt() optlen be unsigned.	2009-09-30 16:12:20 -07:00
Kconfig	ipv4: update ARPD help text	2009-06-13 23:36:32 -07:00
Makefile	IPVS: Move IPVS to net/netfilter/ipvs	2008-10-07 08:38:24 +11:00
netfilter.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
proc.c	snmp: add missing counters for RFC 4293	2009-04-27 02:45:02 -07:00
protocol.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
raw.c	AF_RAW: Augment raw_send_hdrinc to expand skb to fit iphdr->ihl (v2)	2009-10-29 01:09:58 -07:00
route.c	net: Fix RPF to work with policy routing	2009-10-29 22:49:12 -07:00
syncookies.c	percpu: clean up percpu variable definitions	2009-06-24 15:13:48 +09:00
sysctl_net_ipv4.c	sysctl: remove "struct file *" argument of ->proc_handler	2009-09-24 07:21:04 -07:00
tcp.c	net: use WARN() for the WARN_ON in commit b6b39e8f3f	2009-10-22 21:37:56 -07:00
tcp_bic.c	tcp: add helper for AI algorithm	2009-03-02 03:00:15 -08:00
tcp_cong.c	Networking: use CAP_NET_ADMIN when deciding to call request_module	2009-08-14 11:18:34 +10:00
tcp_cubic.c	tcp: add helper for AI algorithm	2009-03-02 03:00:15 -08:00
tcp_diag.c	net: inet_diag_handler structs can be const	2008-11-19 15:43:27 -08:00
tcp_highspeed.c
tcp_htcp.c	htcp: merge icsk_ca_state compare	2009-03-02 03:00:14 -08:00
tcp_hybla.c	tcp: Fix tcp_hybla zero congestion window growth with small rho and large cwnd.	2008-10-07 15:58:17 -07:00
tcp_illinois.c
tcp_input.c	tcp: fix ssthresh u16 leftover	2009-09-15 01:30:10 -07:00
tcp_ipv4.c	tcp: fix ssthresh u16 leftover	2009-09-15 01:30:10 -07:00
tcp_lp.c
tcp_minisocks.c	tcp: accept socket after TCP_DEFER_ACCEPT period	2009-10-19 19:19:01 -07:00
tcp_output.c	IPv4 TCP fails to send window scale option when window scale is zero	2009-10-01 15:14:51 -07:00
tcp_probe.c	tcp: '< 0' test on unsigned	2009-03-13 16:05:14 -07:00
tcp_scalable.c	tcp: add helper for AI algorithm	2009-03-02 03:00:15 -08:00
tcp_timer.c	Revert Backoff [v3]: Calculate TCP's connection close threshold as a time value.	2009-09-01 02:45:47 -07:00
tcp_vegas.c	tcp: tcp_vegas ssthresh bugfix	2009-05-25 22:44:59 -07:00
tcp_vegas.h
tcp_veno.c	tcp: add helper for AI algorithm	2009-03-02 03:00:15 -08:00
tcp_westwood.c
tcp_yeah.c	tcp: add helper for AI algorithm	2009-03-02 03:00:15 -08:00
tunnel4.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
udp.c	net: fix sk_forward_alloc corruption	2009-10-30 12:25:12 -07:00
udp_impl.h	net: Make setsockopt() optlen be unsigned.	2009-09-30 16:12:20 -07:00
udplite.c	net: constify struct net_protocol	2009-09-14 17:03:01 -07:00
xfrm4_input.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
xfrm4_mode_beet.c	ipsec: Interfamily IPSec BEET	2008-08-06 02:39:30 -07:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
xfrm4_output.c	net: skb->dst accessors	2009-06-03 02:51:04 -07:00
xfrm4_policy.c	xfrm4: fix build when SYSCTLs are disabled	2009-08-04 20:18:33 -07:00
xfrm4_state.c	xfrm: remove useless forward declarations	2008-11-25 01:05:54 -08:00
xfrm4_tunnel.c