[NETFILTER]: nf_conntrack: make print_conntrack function optional for l4protos

Allows to remove five empty implementations.
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c

@@ -121,7 +121,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
 		      ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
 		return -ENOSPC;
 
-	if (l4proto->print_conntrack(s, ct))
+	if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
 		return -ENOSPC;
 
 	if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

@@ -74,13 +74,6 @@ static int icmp_print_tuple(struct seq_file *s,
 			  ntohs(tuple->src.u.icmp.id));
 }
 
-/* Print out the private part of the conntrack. */
-static int icmp_print_conntrack(struct seq_file *s,
-				const struct nf_conn *conntrack)
-{
-	return 0;
-}
-
 /* Returns verdict for packet, or -1 for invalid. */
 static int icmp_packet(struct nf_conn *ct,
 		       const struct sk_buff *skb,
@@ -309,7 +302,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
 	.pkt_to_tuple		= icmp_pkt_to_tuple,
 	.invert_tuple		= icmp_invert_tuple,
 	.print_tuple		= icmp_print_tuple,
-	.print_conntrack	= icmp_print_conntrack,
 	.packet			= icmp_packet,
 	.new			= icmp_new,
 	.error			= icmp_error,

net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c

@@ -75,13 +75,6 @@ static int icmpv6_print_tuple(struct seq_file *s,
 			  ntohs(tuple->src.u.icmp.id));
 }
 
-/* Print out the private part of the conntrack. */
-static int icmpv6_print_conntrack(struct seq_file *s,
-				  const struct nf_conn *conntrack)
-{
-	return 0;
-}
-
 /* Returns verdict for packet, or -1 for invalid. */
 static int icmpv6_packet(struct nf_conn *ct,
 		       const struct sk_buff *skb,
@@ -275,7 +268,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
 	.pkt_to_tuple		= icmpv6_pkt_to_tuple,
 	.invert_tuple		= icmpv6_invert_tuple,
 	.print_tuple		= icmpv6_print_tuple,
-	.print_conntrack	= icmpv6_print_conntrack,
 	.packet			= icmpv6_packet,
 	.new			= icmpv6_new,
 	.error			= icmpv6_error,

net/netfilter/nf_conntrack_proto_generic.c

@@ -40,13 +40,6 @@ static int generic_print_tuple(struct seq_file *s,
 	return 0;
 }
 
-/* Print out the private part of the conntrack. */
-static int generic_print_conntrack(struct seq_file *s,
-				   const struct nf_conn *state)
-{
-	return 0;
-}
-
 /* Returns verdict for packet, or -1 for invalid. */
 static int packet(struct nf_conn *conntrack,
 		  const struct sk_buff *skb,
@@ -104,7 +97,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
 	.pkt_to_tuple		= generic_pkt_to_tuple,
 	.invert_tuple		= generic_invert_tuple,
 	.print_tuple		= generic_print_tuple,
-	.print_conntrack	= generic_print_conntrack,
 	.packet			= packet,
 	.new			= new,
 #ifdef CONFIG_SYSCTL

net/netfilter/nf_conntrack_proto_udp.c

@@ -60,13 +60,6 @@ static int udp_print_tuple(struct seq_file *s,
 			  ntohs(tuple->dst.u.udp.port));
 }
 
-/* Print out the private part of the conntrack. */
-static int udp_print_conntrack(struct seq_file *s,
-			       const struct nf_conn *conntrack)
-{
-	return 0;
-}
-
 /* Returns verdict for packet, and may modify conntracktype */
 static int udp_packet(struct nf_conn *conntrack,
 		      const struct sk_buff *skb,
@@ -193,7 +186,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,
-	.print_conntrack	= udp_print_conntrack,
 	.packet			= udp_packet,
 	.new			= udp_new,
 	.error			= udp_error,
@@ -221,7 +213,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
 	.pkt_to_tuple		= udp_pkt_to_tuple,
 	.invert_tuple		= udp_invert_tuple,
 	.print_tuple		= udp_print_tuple,
-	.print_conntrack	= udp_print_conntrack,
 	.packet			= udp_packet,
 	.new			= udp_new,
 	.error			= udp_error,

net/netfilter/nf_conntrack_proto_udplite.c

@@ -59,13 +59,6 @@ static int udplite_print_tuple(struct seq_file *s,
 			  ntohs(tuple->dst.u.udp.port));
 }
 
-/* Print out the private part of the conntrack. */
-static int udplite_print_conntrack(struct seq_file *s,
-				   const struct nf_conn *conntrack)
-{
-	return 0;
-}
-
 /* Returns verdict for packet, and may modify conntracktype */
 static int udplite_packet(struct nf_conn *conntrack,
 			  const struct sk_buff *skb,
@@ -198,7 +191,6 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly =
 	.pkt_to_tuple		= udplite_pkt_to_tuple,
 	.invert_tuple		= udplite_invert_tuple,
 	.print_tuple		= udplite_print_tuple,
-	.print_conntrack	= udplite_print_conntrack,
 	.packet			= udplite_packet,
 	.new			= udplite_new,
 	.error			= udplite_error,
@@ -222,7 +214,6 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly =
 	.pkt_to_tuple		= udplite_pkt_to_tuple,
 	.invert_tuple		= udplite_invert_tuple,
 	.print_tuple		= udplite_print_tuple,
-	.print_conntrack	= udplite_print_conntrack,
 	.packet			= udplite_packet,
 	.new			= udplite_new,
 	.error			= udplite_error,

net/netfilter/nf_conntrack_standalone.c

@@ -142,7 +142,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
 		       ? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
 		return -ENOSPC;
 
-	if (l4proto->print_conntrack(s, conntrack))
+	if (l4proto->print_conntrack && l4proto->print_conntrack(s, conntrack))
 		return -ENOSPC;
 
 	if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,