netfilter: nf_conntrack: add nf_ct_kill()

Encapsulate the common

if (del_timer(&ct->timeout))
ct->timeout.function((unsigned long)ct)

sequence in a new function.

Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/netfilter/nf_conntrack.h

···
 	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
 }
 
+extern void nf_ct_kill(struct nf_conn *ct);
+
 /* These are for NAT.  Icky. */
 /* Update TCP window tracking data when NAT mangles the packet */
 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

···
 	   means this will only run once even if count hits zero twice
 	   (theoretically possible with SMP) */
 	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
-		if (atomic_dec_and_test(&ct->proto.icmp.count)
-		    && del_timer(&ct->timeout))
-			ct->timeout.function((unsigned long)ct);
+		if (atomic_dec_and_test(&ct->proto.icmp.count))
+			nf_ct_kill(ct);
 	} else {
 		atomic_inc(&ct->proto.icmp.count);
 		nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);

net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c

···
 	   means this will only run once even if count hits zero twice
 	   (theoretically possible with SMP) */
 	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) {
-		if (atomic_dec_and_test(&ct->proto.icmp.count)
-		    && del_timer(&ct->timeout))
-			ct->timeout.function((unsigned long)ct);
+		if (atomic_dec_and_test(&ct->proto.icmp.count))
+			nf_ct_kill(ct);
 	} else {
 		atomic_inc(&ct->proto.icmp.count);
 		nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);

net/netfilter/nf_conntrack_core.c

···
 }
 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
 
+void nf_ct_kill(struct nf_conn *ct)
+{
+	if (del_timer(&ct->timeout))
+		ct->timeout.function((unsigned long)ct);
+}
+EXPORT_SYMBOL_GPL(nf_ct_kill);
+
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 
 #include <linux/netfilter/nfnetlink.h>

net/netfilter/nf_conntrack_netlink.c

···
 			return -ENOENT;
 		}
 	}
-	if (del_timer(&ct->timeout))
-		ct->timeout.function((unsigned long)ct);
 
+	nf_ct_kill(ct);
 	nf_ct_put(ct);
 
 	return 0;

net/netfilter/nf_conntrack_proto_dccp.c

···
 	if (type == DCCP_PKT_RESET &&
 	    !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
 		/* Tear down connection immediately if only reply is a RESET */
-		if (del_timer(&ct->timeout))
-			ct->timeout.function((unsigned long)ct);
+		nf_ct_kill(ct);
 		return NF_ACCEPT;
 	}
 

net/netfilter/nf_conntrack_proto_tcp.c

···
 			/* Attempt to reopen a closed/aborted connection.
 			 * Delete this connection and look up again. */
 			write_unlock_bh(&tcp_lock);
-			if (del_timer(&ct->timeout))
-				ct->timeout.function((unsigned long)ct);
+			nf_ct_kill(ct);
 			return -NF_REPEAT;
 		}
 		/* Fall through */
···
 			if (LOG_INVALID(IPPROTO_TCP))
 				nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
 					  "nf_ct_tcp: killing out of sync session ");
-			if (del_timer(&ct->timeout))
-				ct->timeout.function((unsigned long)ct);
+			nf_ct_kill(ct);
 			return -NF_DROP;
 		}
 		ct->proto.tcp.last_index = index;
···
 		   problem case, so we can delete the conntrack
 		   immediately.  --RR */
 		if (th->rst) {
-			if (del_timer(&ct->timeout))
-				ct->timeout.function((unsigned long)ct);
+			nf_ct_kill(ct);
 			return NF_ACCEPT;
 		}
 	} else if (!test_bit(IPS_ASSURED_BIT, &ct->status)