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4dfc281702
linux/net/ipv4
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Florian Westphal 4dfc281702 [Syncookies]: Add support for TCP options via timestamps. 
Allow the use of SACK and window scaling when syncookies are used
and the client supports tcp timestamps. Options are encoded into
the timestamp sent in the syn-ack and restored from the timestamp
echo when the ack is received.

Based on earlier work by Glenn Griffin.
This patch avoids increasing the size of structs by encoding TCP
options into the least significant bits of the timestamp and
by not using any 'timestamp offset'.

The downside is that the timestamp sent in the packet after the synack
will increase by several seconds.

changes since v1:
 don't duplicate timestamp echo decoding function, put it into ipv4/syncookie.c
 and have ipv6/syncookies.c use it.
 Feedback from Glenn Griffin: fix line indented with spaces, kill redundant if ()

Reviewed-by: Hagen Paul Pfeifer <hagen@jauu.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-10 03:12:40 -07:00
..
ipvs net: replace remaining __FUNCTION__ occurrences 2008-03-05 20:47:47 -08:00
netfilter Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-03-27 18:48:56 -07:00
af_inet.c [INET]: uc_ttl assignment in inet_ctl_sock_create is redundant. 2008-04-03 14:30:12 -07:00
ah4.c [IPSEC]: Fix bogus usage of u64 on input sequence number 2008-02-12 22:50:35 -08:00
arp.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
cipso_ipv4.c [IPV4]: Remove unused ip_options->is_data. 2008-03-22 16:35:29 -07:00
datagram.c [IPV4] net/ipv4: Use ipv4_is_<type> 2008-01-28 14:58:15 -08:00
devinet.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
esp4.c [ESP]: Ensure IV is in linear part of the skb to avoid BUG() due to OOB access 2008-03-27 16:08:03 -07:00
fib_frontend.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
fib_hash.c [NET] NETNS: Omit seq_net_private->net without CONFIG_NET_NS. 2008-03-26 04:39:56 +09:00
fib_lookup.h [IPV4] FIB_HASH: Reduce memory needs and speedup lookups 2008-01-28 15:02:46 -08:00
fib_rules.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
fib_semantics.c [NETNS]: Lookup in FIB semantic hashes taking into account the namespace. 2008-01-31 19:28:41 -08:00
fib_trie.c IPV4: fib_trie use vmalloc for large tnodes 2008-04-10 02:56:38 -07:00
icmp.c [ICMP]: Simplify ICMP control socket creation. 2008-04-03 14:29:00 -07:00
igmp.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
inet_connection_sock.c [INET]: Rename inet_csk_ctl_sock_create to inet_ctl_sock_create. 2008-04-03 14:22:32 -07:00
inet_diag.c [NETNS]: Tcp-v6 sockets per-net lookup. 2008-01-31 19:28:20 -08:00
inet_fragment.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-04-02 22:35:23 -07:00
inet_hashtables.c [SOCK][NETNS]: Add a struct net argument to sock_prot_inuse_add and _get. 2008-03-31 19:41:46 -07:00
inet_lro.c
inet_timewait_sock.c [SOCK][NETNS]: Add a struct net argument to sock_prot_inuse_add and _get. 2008-03-31 19:41:46 -07:00
inetpeer.c
ip_forward.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-04-02 22:35:23 -07:00
ip_fragment.c [NET]: Rename inet_frag.h identifiers COMPLETE, FIRST_IN, LAST_IN to INET_FRAG_* 2008-03-28 16:35:27 -07:00
ip_gre.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
ip_input.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
ip_options.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
ip_output.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
ip_sockglue.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
ipcomp.c [IPCOMP]: Disable BH on output when using shared tfm 2008-02-28 11:23:17 -08:00
ipconfig.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
ipip.c [IPV4]: Add 'rtable' field in struct sk_buff to alias 'dst' and avoid casts 2008-03-05 18:30:47 -08:00
ipmr.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
Kconfig [UDP]: Revert udplite and code split. 2008-03-06 16:22:02 -08:00
Makefile [UDP]: Revert udplite and code split. 2008-03-06 16:22:02 -08:00
netfilter.c [NETNS]: Add namespace parameter to ip_route_output_key. 2008-01-28 15:11:07 -08:00
proc.c [IPV4][NETNS]: Display per-net info in sockstat file. 2008-03-31 19:43:18 -07:00
protocol.c
raw.c [SOCK][NETNS]: Add a struct net argument to sock_prot_inuse_add and _get. 2008-03-31 19:41:46 -07:00
route.c IPV4: route rekey timer can be deferrable 2008-04-10 01:55:27 -07:00
syncookies.c [Syncookies]: Add support for TCP options via timestamps. 2008-04-10 03:12:40 -07:00
sysctl_net_ipv4.c [NETNS][ICMP]: Make ctl tables for ICMP sysctls per-net. 2008-03-26 01:56:24 -07:00
tcp_bic.c [TCP]: BIC web page link is corrected. 2008-02-28 22:14:32 -08:00
tcp_cong.c [TCP]: Uninline tcp_is_cwnd_limited 2008-01-28 15:01:48 -08:00
tcp_cubic.c [TCP]: TCP cubic v2.2 2008-03-04 14:17:41 -08:00
tcp_diag.c
tcp_highspeed.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_htcp.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_hybla.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_illinois.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_input.c [TCP]: TCP_DEFER_ACCEPT updates - process as established 2008-03-21 16:33:01 -07:00
tcp_ipv4.c [Syncookies]: Add support for TCP options via timestamps. 2008-04-10 03:12:40 -07:00
tcp_lp.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_minisocks.c [TCP]: TCP_DEFER_ACCEPT updates - process as established 2008-03-21 16:33:01 -07:00
tcp_output.c [Syncookies]: Add support for TCP options via timestamps. 2008-04-10 03:12:40 -07:00
tcp_probe.c
tcp_scalable.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_timer.c [TCP]: TCP_DEFER_ACCEPT updates - process as established 2008-03-21 16:33:01 -07:00
tcp_vegas.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_vegas.h
tcp_veno.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp_westwood.c
tcp_yeah.c [TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28 14:55:41 -08:00
tcp.c Merge branch 'master' of ../net-2.6/ 2008-03-23 22:54:03 -07:00
tunnel4.c
udp_impl.h [UDP]: Make full use of proto.h.udp_hash innovation. 2008-03-22 16:51:21 -07:00
udp.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-04-02 22:35:23 -07:00
udplite.c [UDP]: Remove owner from udp_seq_afinfo. 2008-03-28 18:25:53 -07:00
xfrm4_input.c [IPSEC]: Fix transport-mode async resume on intput without netfilter 2008-01-28 15:00:10 -08:00
xfrm4_mode_beet.c [IPSEC]: Fix BEET output 2008-03-26 16:51:09 -07:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c [IPSEC]: Fix inter address family IPsec tunnel handling. 2008-03-24 14:51:51 -07:00
xfrm4_output.c [IPSEC]: Fix inter address family IPsec tunnel handling. 2008-03-24 14:51:51 -07:00
xfrm4_policy.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
xfrm4_state.c [IPSEC]: Fix BEET output 2008-03-26 16:51:09 -07:00
xfrm4_tunnel.c [IPCOMP]: Fix reception of incompressible packets 2008-01-31 19:27:24 -08:00