netfilter: nf_ct_icmp: add namespace support

This patch adds namespace support for ICMP protocol tracker.

Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
index 7bd14ab..3d8e9e3 100644
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -45,10 +45,16 @@
 	unsigned int timeouts[UDP_CT_MAX];
 };
 
+struct nf_icmp_net {
+	struct nf_proto_net pn;
+	unsigned int timeout;
+};
+
 struct nf_ip_net {
 	struct nf_generic_net   generic;
 	struct nf_tcp_net	tcp;
 	struct nf_udp_net	udp;
+	struct nf_icmp_net	icmp;
 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
 	struct ctl_table_header *ctl_table_header;
 	struct ctl_table	*ctl_table;