kybaaz/linux-xiaomi-chiron
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

netfilter: nf_defrag: Skip defrag if NOTRACK is set

Browse source 
conntrack defrag is needed only if some module like CONNTRACK or NAT
explicitly requests it. For plain forwarding scenarios, defrag is
not needed and can be skipped if NOTRACK is set in a rule.

Since conntrack defrag is currently higher priority than raw table,
setting NOTRACK is not sufficient. We need to move raw to a higher
priority for iptables only.

This is achieved by introducing a module parameter "raw_before_defrag"
which allows to change the priority of raw table to place it before
defrag. By default, the parameter is disabled and the priority of raw
table is NF_IP_PRI_RAW to support legacy behavior. If the module
parameter is enabled, then the priority of the raw table is set to
NF_IP_PRI_RAW_BEFORE_DEFRAG.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Subash Abhinov Kasiviswanathan 2018-01-10 20:51:57 -07:00 • committed by Pablo Neira Ayuso
parent 5ed001baee
commit 902d6a4c2a
6 changed files with 30 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/uapi/linux/netfilter_ipv4.h
View file

@ -57,6 +57,7 @@
enum nf_ip_hook_priorities {
NF_IP_PRI_FIRST = INT_MIN,
NF_IP_PRI_RAW_BEFORE_DEFRAG = -450,
NF_IP_PRI_CONNTRACK_DEFRAG = -400,
NF_IP_PRI_RAW = -300,
NF_IP_PRI_SELINUX_FIRST = -225,

1
include/uapi/linux/netfilter_ipv6.h
View file

@ -62,6 +62,7 @@
enum nf_ip6_hook_priorities {
NF_IP6_PRI_FIRST = INT_MIN,
NF_IP6_PRI_RAW_BEFORE_DEFRAG = -450,
NF_IP6_PRI_CONNTRACK_DEFRAG = -400,
NF_IP6_PRI_RAW = -300,
NF_IP6_PRI_SELINUX_FIRST = -225,