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netfilter: add and use jump label for xt_tee

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Don't bother testing if we need to switch to alternate stack
unless TEE target is used.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-07-14 17:51:09 +02:00 • committed by Pablo Neira Ayuso
parent 7814b6ec6d
commit dcebd3153e
5 changed files with 16 additions and 2 deletions
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7
include/linux/netfilter/x_tables.h
View file

@ -3,6 +3,7 @@
#include <linux/netdevice.h>
#include <linux/static_key.h>
#include <uapi/linux/netfilter/x_tables.h>
/**
@ -280,6 +281,12 @@ void xt_free_table_info(struct xt_table_info *info);
*/
DECLARE_PER_CPU(seqcount_t, xt_recseq);
/* xt_tee_enabled - true if x_tables needs to handle reentrancy
*
* Enabled if current ip(6)tables ruleset has at least one -j TEE rule.
*/
extern struct static_key xt_tee_enabled;
/**
* xt_write_recseq_begin - start of a write section
*