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authorFlorian Westphal <fw@strlen.de>2016-11-15 21:36:44 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2016-12-04 21:17:25 +0100
commit481fa3734769b67f00ed09a42f2a6a8cbd00b869 (patch)
tree3a789caf579fe1bfadd0252574de42f9980518e3 /Documentation/networking
parent0c66dc1ea3f0366221f8a5a16c73f01ea9259678 (diff)
downloadlinux-481fa3734769b67f00ed09a42f2a6a8cbd00b869.tar.bz2
netfilter: conntrack: add nf_conntrack_default_on sysctl
This switch (default on) can be used to disable automatic registration of connection tracking functionality in newly created network namespaces. This means that when net namespace goes down (or the tracker protocol module is unloaded) we *might* have to unregister the hooks. We can either add another per-netns variable that tells if the hooks got registered by default, or, alternatively, just call the protocol _put() function and have the callee deal with a possible 'extra' put() operation that doesn't pair with a get() one. This uses the latter approach, i.e. a put() without a get has no effect. Conntrack is still enabled automatically regardless of the new sysctl setting if the new net namespace requires connection tracking, e.g. when NAT rules are created. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/nf_conntrack-sysctl.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/networking/nf_conntrack-sysctl.txt b/Documentation/networking/nf_conntrack-sysctl.txt
index 433b6724797a..497d668288f9 100644
--- a/Documentation/networking/nf_conntrack-sysctl.txt
+++ b/Documentation/networking/nf_conntrack-sysctl.txt
@@ -96,6 +96,17 @@ nf_conntrack_max - INTEGER
Size of connection tracking table. Default value is
nf_conntrack_buckets value * 4.
+nf_conntrack_default_on - BOOLEAN
+ 0 - don't register conntrack in new net namespaces
+ 1 - register conntrack in new net namespaces (default)
+
+ This controls wheter newly created network namespaces have connection
+ tracking enabled by default. It will be enabled automatically
+ regardless of this setting if the new net namespace requires
+ connection tracking, e.g. when NAT rules are created.
+ This setting is only visible in initial user namespace, it has no
+ effect on existing namespaces.
+
nf_conntrack_tcp_be_liberal - BOOLEAN
0 - disabled (default)
not 0 - enabled