net/sched: add ACT_CSUM action to update packets checksums
authorGrégoire Baron <baronchon@n7mm.org>
Wed, 18 Aug 2010 13:10:35 +0000 (13:10 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 20 Aug 2010 08:42:59 +0000 (01:42 -0700)
commiteb4d40654505e47aa9d2035bb97f631fa61d14b4
treebed2a1c5026e9797c0ed48c67c48b050e7f07e3c
parent49e8ab03ebcacd8e37660ffec20c0c46721a2800
net/sched: add ACT_CSUM action to update packets checksums

net/sched: add ACT_CSUM action to update packets checksums

ACT_CSUM can be called just after ACT_PEDIT in order to re-compute some
altered checksums in IPv4 and IPv6 packets. The following checksums are
supported by this patch:
 - IPv4: IPv4 header, ICMP, IGMP, TCP, UDP & UDPLite
 - IPv6: ICMPv6, TCP, UDP & UDPLite
It's possible to request in the same action to update different kind of
checksums, if the packets flow mix TCP, UDP and UDPLite, ...

An example of usage is done in the associated iproute2 patch.

Version 3 changes:
 - remove useless goto instructions
 - improve IPv6 hop options decoding

Version 2 changes:
 - coding style correction
 - remove useless arguments of some functions
 - use stack in tcf_csum_dump()
 - add tcf_csum_skb_nextlayer() to factor code

Signed-off-by: Gregoire Baron <baronchon@n7mm.org>
Acked-by: jamal <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/tc_act/Kbuild
include/linux/tc_act/tc_csum.h [new file with mode: 0644]
include/net/tc_act/tc_csum.h [new file with mode: 0644]
net/sched/Kconfig
net/sched/Makefile
net/sched/act_csum.c [new file with mode: 0644]