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netfilter: nf_tables: add nft_dereference() macro

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Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-02-18 18:06:49 +00:00 committed by Pablo Neira Ayuso
parent 0eb5db7ad3
commit 67a8fc27cc
2 changed files with 5 additions and 2 deletions
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4
include/net/netfilter/nf_tables.h
View file

@ -3,6 +3,7 @@
#include <linux/list.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netlink.h>
@ -521,6 +522,9 @@ void nft_unregister_chain_type(const struct nf_chain_type *);
int nft_register_expr(struct nft_expr_type *);
void nft_unregister_expr(struct nft_expr_type *);
#define nft_dereference(p) \
nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
#define MODULE_ALIAS_NFT_FAMILY(family) \
MODULE_ALIAS("nft-afinfo-" __stringify(family))

3
net/netfilter/nf_tables_api.c
View file

@ -794,9 +794,8 @@ nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr)
stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
if (chain->stats) {
/* nfnl_lock is held, add some nfnl function for this, later */
struct nft_stats __percpu *oldstats =
rcu_dereference_protected(chain->stats, 1);
nft_dereference(chain->stats);
rcu_assign_pointer(chain->stats, newstats);
synchronize_rcu();