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authorEric Dumazet <eric.dumazet@gmail.com>2011-07-18 18:08:07 +0400
committerPatrick McHardy <kaber@trash.net>2011-07-18 18:08:07 +0400
commit6b75e3e8d664a9a1b99d31a7f4976ae70d1d090a (patch)
tree940d95c340df22db092062bdaea599e9afc4fcf9 /include/linux/netfilter
parent131ad62d8fc06d9d0a5c61d9526876352c2f2bbd (diff)
downloadlinux-6b75e3e8d664a9a1b99d31a7f4976ae70d1d090a.tar.xz
netfilter: nfnetlink: add RCU in nfnetlink_rcv_msg()
Goal of this patch is to permit nfnetlink providers not mandate nfnl_mutex being held while nfnetlink_rcv_msg() calls them. If struct nfnl_callback contains a non NULL call_rcu(), then nfnetlink_rcv_msg() will use it instead of call() field, holding rcu_read_lock instead of nfnl_mutex Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Florian Westphal <fw@strlen.de> CC: Eric Leblond <eric@regit.org> Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include/linux/netfilter')
-rw-r--r--include/linux/netfilter/nfnetlink.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 2b11fc1a86be..74d33861473c 100644
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -60,6 +60,9 @@ struct nfnl_callback {
int (*call)(struct sock *nl, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const cda[]);
+ int (*call_rcu)(struct sock *nl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const cda[]);
const struct nla_policy *policy; /* netlink attribute policy */
const u_int16_t attr_count; /* number of nlattr's */
};