diff options
author | Florian Westphal <fw@strlen.de> | 2015-11-28 21:53:05 +0100 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-12-09 13:23:13 +0100 |
commit | e639f7ab079b5256660018511d87aa34b54f1a9d (patch) | |
tree | 09f266f4a2ad558dced74ac4287a3277cccdc6be /net/netfilter/nf_tables_trace.c | |
parent | 33d5a7b14bfd02e60af9d223db8dfff0cbcabe6b (diff) | |
download | linux-e639f7ab079b5256660018511d87aa34b54f1a9d.tar.bz2 |
netfilter: nf_tables: wrap tracing with a static key
Only needed when meta nftrace rule(s) were added.
The assumption is that no such rules are active, so the call to
nft_trace_init is "never" needed.
When nftrace rules are active, we always call the nft_trace_* functions,
but will only send netlink messages when all of the following are true:
- traceinfo structure was initialised
- skb->nf_trace == 1
- at least one subscriber to trace group.
Adding an extra conditional
(static_branch ... && skb->nf_trace)
nft_trace_init( ..)
Is possible but results in a larger nft_do_chain footprint.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_tables_trace.c')
-rw-r--r-- | net/netfilter/nf_tables_trace.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_trace.c b/net/netfilter/nf_tables_trace.c index 36fd7ad6729a..e9e959f65d91 100644 --- a/net/netfilter/nf_tables_trace.c +++ b/net/netfilter/nf_tables_trace.c @@ -8,6 +8,7 @@ */ #include <linux/module.h> +#include <linux/static_key.h> #include <linux/hash.h> #include <linux/jhash.h> #include <linux/if_vlan.h> @@ -24,6 +25,9 @@ #define NFT_TRACETYPE_NETWORK_HSIZE 40 #define NFT_TRACETYPE_TRANSPORT_HSIZE 20 +DEFINE_STATIC_KEY_FALSE(nft_trace_enabled); +EXPORT_SYMBOL_GPL(nft_trace_enabled); + static int trace_fill_id(struct sk_buff *nlskb, struct sk_buff *skb) { __be32 id; |