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Eric Dumazet fc1ad92dfc tcp: allow timestamps even if SYN packet has tsval=0 
Some systems send SYN packets with apparently wrong RFC1323 timestamp
option values [timestamp tsval=0 tsecr=0].
It might be for security reasons (http://www.secuobs.com/plugs/25220.shtml )

Linux TCP stack ignores this option and sends back a SYN+ACK packet
without timestamp option, thus many TCP flows cannot use timestamps
and lose some benefit of RFC1323.

Other operating systems seem to not care about initial tsval value, and let
tcp flows to negotiate timestamp option.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-11 09:23:57 -07:00
..
9p 9p: fix sparse warning: cast adds address space 2009-02-26 23:13:32 -08:00
802 Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-05 02:06:47 -08:00
8021q net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
appletalk net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
atm lec: convert to net_device_ops 2009-01-21 14:02:00 -08:00
ax25 net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
bluetooth Bluetooth: Remove some pointless conditionals before kfree_skb() 2009-02-27 06:14:49 +01:00
bridge netlink: change nlmsg_notify() return value logic 2009-02-24 23:18:28 -08:00
can can: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:35 -08:00
core net: fix warning about non-const string 2009-03-10 05:22:43 -07:00
dcb DCB: fix kfree(skb) 2009-01-04 17:29:21 -08:00
dccp dccp: Do not let initial option overhead shrink the MPS 2009-03-02 03:07:23 -08:00
decnet net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
dsa net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
econet net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
ethernet eth: Declare an optimized compare_ether_addr_64bits() function 2008-11-23 23:24:32 -08:00
ipv4 tcp: allow timestamps even if SYN packet has tsval=0 2009-03-11 09:23:57 -07:00
ipv6 net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
ipx net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
irda net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
iucv iucv: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:37 -08:00
key af_key: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:32 -08:00
lapb
llc net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
mac80211 mac80211: Update IBSS beacon timestamp properly 2009-03-05 14:39:40 -05:00
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-02-25 00:02:05 -08:00
netlabel netlabel: Update kernel configuration API 2008-12-31 12:54:11 -05:00
netlink Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-05 02:06:47 -08:00
netrom netrom: convert to net_device_ops 2009-01-21 14:02:02 -08:00
packet packet: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:35 -08:00
phonet net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
rds rds: fix iband RDMA dependencies 2009-03-03 21:39:40 -08:00
rfkill net/rfkill/rfkill.c: fix unused rfkill_led_trigger() warning 2009-01-04 17:11:24 -08:00
rose rose: convert to network_device_ops 2009-01-21 14:02:04 -08:00
rxrpc RxRPC: Fix a potential NULL dereference 2009-02-06 21:50:52 -08:00
sched Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-05 02:06:47 -08:00
sctp Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-05 02:06:47 -08:00
sunrpc net/sunrpc/xprtsock.c: some common code found 2009-02-06 23:48:33 -08:00
tipc net/tipc/bcast.h: use ARRAY_SIZE 2009-01-11 00:06:33 -08:00
unix unix: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:34 -08:00
wanrouter wanrouter: fix sparse warnings: context imbalance 2009-02-26 23:13:36 -08:00
wimax Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-14 23:12:00 -08:00
wireless Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-10 05:04:16 -07:00
x25 net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
xfrm Revert "xfrm: For 32/64 compatability wrt. xfrm_usersa_info" 2009-01-20 09:49:51 -08:00
compat.c net: socket infrastructure for SO_TIMESTAMPING 2009-02-15 22:43:35 -08:00
Kconfig RDS: Kconfig and Makefile 2009-02-26 23:43:35 -08:00
Makefile RDS: Kconfig and Makefile 2009-02-26 23:43:35 -08:00
nonet.c
socket.c net: socket infrastructure for SO_TIMESTAMPING 2009-02-15 22:43:35 -08:00
sysctl_net.c missing bits of net-namespace / sysctl 2008-07-27 09:45:34 -07:00
TUNABLE