From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: [PATCH 2/3] netfilter: ctnetlink: fix reliable event delivery if message building fails Date: Wed, 17 Mar 2010 00:30:21 +0100 Message-ID: <20100316233021.4185.8786.stgit@decadence> References: <20100316232247.4185.19426.stgit@decadence> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: kaber@trash.net, davem@davemloft.net To: netdev@vger.kernel.org Return-path: Received: from mail.us.es ([193.147.175.20]:59027 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751143Ab0CPXa2 (ORCPT ); Tue, 16 Mar 2010 19:30:28 -0400 In-Reply-To: <20100316232247.4185.19426.stgit@decadence> Sender: netdev-owner@vger.kernel.org List-ID: This patch fixes a bug that allows to lose events when reliable event delivery mode is used, ie. if NETLINK_BROADCAST_SEND_ERROR and NETLINK_RECV_NO_ENOBUFS socket options are set. Signed-off-by: Pablo Neira Ayuso --- include/linux/netfilter/nfnetlink.h | 2 +- net/netfilter/nf_conntrack_netlink.c | 4 +++- net/netfilter/nfnetlink.c | 4 ++-- 3 files changed, 6 insertions(+), 4 deletions(-) diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h index 5392386..361d6b5 100644 --- a/include/linux/netfilter/nfnetlink.h +++ b/include/linux/netfilter/nfnetlink.h @@ -76,7 +76,7 @@ extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n); extern int nfnetlink_has_listeners(struct net *net, unsigned int group); extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo, gfp_t flags); -extern void nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error); +extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error); extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags); extern void nfnl_lock(void); diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 8b05f36..00016e0 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -582,7 +582,9 @@ nla_put_failure: nlmsg_failure: kfree_skb(skb); errout: - nfnetlink_set_err(net, 0, group, -ENOBUFS); + if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0) + return -ENOBUFS; + return 0; } #endif /* CONFIG_NF_CONNTRACK_EVENTS */ diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c index 8eb0cc2..6afa3d5 100644 --- a/net/netfilter/nfnetlink.c +++ b/net/netfilter/nfnetlink.c @@ -113,9 +113,9 @@ int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, } EXPORT_SYMBOL_GPL(nfnetlink_send); -void nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error) +int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error) { - netlink_set_err(net->nfnl, pid, group, error); + return netlink_set_err(net->nfnl, pid, group, error); } EXPORT_SYMBOL_GPL(nfnetlink_set_err);