[UDP]: Allow users to configure UDP-Lite.

Let's give users an option for disabling UDP-Lite (~4K).

old:
|    text	   data	    bss	    dec	    hex	filename
|  286498	  12432	   6072	 305002	  4a76a	net/ipv4/built-in.o
|  193830	   8192	   3204	 205226	  321aa	net/ipv6/ipv6.o

new (without UDP-Lite):
|    text	   data	    bss	    dec	    hex	filename
|  284086	  12136	   5432	 301654	  49a56	net/ipv4/built-in.o
|  191835	   7832	   3076	 202743	  317f7	net/ipv6/ipv6.o

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

10 files changed, 71 insertions, 23 deletions

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 19880b086e71..efe3832c4ad8 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -632,5 +632,15 @@ config TCP_MD5SIG
 
 	  If unsure, say N.
 
+config IP_UDPLITE
+	bool "IP: UDP-Lite Protocol (RFC 3828)"
+	default n
+	---help---
+	  UDP-Lite (RFC 3828) is a UDP-like protocol with variable-length
+	  checksum.  Read <file:Documentation/networking/udplite.txt> for
+	  details.
+
+	  If unsure, say N.
+
 source "net/ipv4/ipvs/Kconfig"
 
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index ad40ef3f9ebc..e88cebdf3e30 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -8,7 +8,7 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     inet_timewait_sock.o inet_connection_sock.o \
 	     tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
 	     tcp_minisocks.o tcp_cong.o \
-	     datagram.o raw.o udp.o udplite.o \
+	     datagram.o raw.o udp.o \
 	     arp.o icmp.o devinet.o af_inet.o  igmp.o \
 	     fib_frontend.o fib_semantics.o \
 	     inet_fragment.o
@@ -49,6 +49,7 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
 obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
 obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
 obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
+obj-$(CONFIG_IP_UDPLITE) += udplite.o
 obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 4f539bd48718..67260c0eaaa8 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1317,15 +1317,18 @@ static int __init init_ipv4_mibs(void)
 	if (snmp_mib_init((void **)udp_statistics,
 			  sizeof(struct udp_mib)) < 0)
 		goto err_udp_mib;
+#ifdef CONFIG_IP_UDPLITE
 	if (snmp_mib_init((void **)udplite_statistics,
 			  sizeof(struct udp_mib)) < 0)
 		goto err_udplite_mib;
-
+#endif
 	tcp_mib_init();
 
 	return 0;
 
+#ifdef CONFIG_IP_UDPLITE
 err_udplite_mib:
+#endif
 	snmp_mib_free((void **)udp_statistics);
 err_udp_mib:
 	snmp_mib_free((void **)tcp_statistics);
@@ -1423,8 +1426,10 @@ static int __init inet_init(void)
 	/* Setup UDP memory threshold */
 	udp_init();
 
+#ifdef CONFIG_IP_UDPLITE
 	/* Add UDP-Lite (RFC 3828) */
 	udplite4_register();
+#endif
 
 	/*
 	 *	Set the ICMP layer up
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index d63474c6b400..d75ddb7fa4b8 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -59,7 +59,9 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
 		   atomic_read(&tcp_memory_allocated));
 	seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse_get(&udp_prot),
 		   atomic_read(&udp_memory_allocated));
+#ifdef CONFIG_IP_UDPLITE
 	seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse_get(&udplite_prot));
+#endif
 	seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse_get(&raw_prot));
 	seq_printf(seq,  "FRAG: inuse %d memory %d\n",
 			ip_frag_nqueues(&init_net), ip_frag_mem(&init_net));
@@ -349,6 +351,7 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
 			   snmp_fold_field((void **)udp_statistics,
 					   snmp4_udp_list[i].entry));
 
+#ifdef CONFIG_IP_UDPLITE
 	/* the UDP and UDP-Lite MIBs are the same */
 	seq_puts(seq, "\nUdpLite:");
 	for (i = 0; snmp4_udp_list[i].name != NULL; i++)
@@ -359,7 +362,7 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
 		seq_printf(seq, " %lu",
 			   snmp_fold_field((void **)udplite_statistics,
 					   snmp4_udp_list[i].entry));
-
+#endif
 	seq_putc(seq, '\n');
 	return 0;
 }
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 7ea1b67b6de1..acc353aa89eb 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1127,7 +1127,7 @@ static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
 	UDP_SKB_CB(skb)->partial_cov = 0;
 	UDP_SKB_CB(skb)->cscov = skb->len;
 
-	if (proto == IPPROTO_UDPLITE) {
+	if (IS_PROTO_UDPLITE(proto)) {
 		err = udplite_checksum_init(skb, uh);
 		if (err)
 			return err;
@@ -1175,7 +1175,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 	if (ulen > skb->len)
 		goto short_packet;
 
-	if (proto == IPPROTO_UDP) {
+	if (IS_PROTO_UDPLITE(proto)) {
 		/* UDP validates ulen. */
 		if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
 			goto short_packet;
@@ -1217,7 +1217,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 	if (udp_lib_checksum_complete(skb))
 		goto csum_error;
 
-	UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
+	UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 
 	/*
@@ -1229,7 +1229,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 
 short_packet:
 	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
-		       proto == IPPROTO_UDPLITE ? "-Lite" : "",
+		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
 		       NIPQUAD(saddr),
 		       ntohs(uh->source),
 		       ulen,
@@ -1244,14 +1244,14 @@ csum_error:
 	 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
 	 */
 	LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
-		       proto == IPPROTO_UDPLITE ? "-Lite" : "",
+		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
 		       NIPQUAD(saddr),
 		       ntohs(uh->source),
 		       NIPQUAD(daddr),
 		       ntohs(uh->dest),
 		       ulen);
 drop:
-	UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
+	UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
 	kfree_skb(skb);
 	return 0;
 }
@@ -1279,7 +1279,9 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 	struct udp_sock *up = udp_sk(sk);
 	int val;
 	int err = 0;
+#ifdef CONFIG_IP_UDPLITE
 	int is_udplite = IS_UDPLITE(sk);
+#endif
 
 	if (optlen<sizeof(int))
 		return -EINVAL;
@@ -1315,6 +1317,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 		}
 		break;
 
+#ifdef CONFIG_IP_UDPLITE
 	/*
 	 * 	UDP-Lite's partial checksum coverage (RFC 3828).
 	 */
@@ -1340,6 +1343,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 		up->pcrlen = val;
 		up->pcflag |= UDPLITE_RECV_CC;
 		break;
+#endif
 
 	default:
 		err = -ENOPROTOOPT;
@@ -1352,7 +1356,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
 int udp_setsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, int optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
 					  udp_push_pending_frames);
 	return ip_setsockopt(sk, level, optname, optval, optlen);
@@ -1362,7 +1366,7 @@ int udp_setsockopt(struct sock *sk, int level, int optname,
 int compat_udp_setsockopt(struct sock *sk, int level, int optname,
 			  char __user *optval, int optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
 					  udp_push_pending_frames);
 	return compat_ip_setsockopt(sk, level, optname, optval, optlen);
@@ -1416,7 +1420,7 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
 int udp_getsockopt(struct sock *sk, int level, int optname,
 		   char __user *optval, int __user *optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
 	return ip_getsockopt(sk, level, optname, optval, optlen);
 }
@@ -1425,7 +1429,7 @@ int udp_getsockopt(struct sock *sk, int level, int optname,
 int compat_udp_getsockopt(struct sock *sk, int level, int optname,
 				 char __user *optval, int __user *optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
 	return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 }
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index ae14617e607f..81969479955f 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_IPV6) += ipv6.o
 
 ipv6-objs :=	af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
 		addrlabel.o \
-		route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
+		route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o \
 		raw.o protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \
 		exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o
 
@@ -17,6 +17,7 @@ ipv6-$(CONFIG_NETFILTER) += netfilter.o
 ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
 ipv6-$(CONFIG_PROC_FS) += proc.o
 ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
+ipv6-$(CONFIG_IP_UDPLITE) += udplite.o
 
 ipv6-objs += $(ipv6-y)
 
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 9869f87243cf..243c42a6b80d 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -691,12 +691,16 @@ static int __init init_ipv6_mibs(void)
 		goto err_icmpmsg_mib;
 	if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
 		goto err_udp_mib;
+#ifdef CONFIG_IP_UDPLITE
 	if (snmp_mib_init((void **)udplite_stats_in6,
 			  sizeof (struct udp_mib)) < 0)
 		goto err_udplite_mib;
+#endif
 	return 0;
 
+#ifdef CONFIG_IP_UDPLITE
 err_udplite_mib:
+#endif
 	snmp_mib_free((void **)udp_stats_in6);
 err_udp_mib:
 	snmp_mib_free((void **)icmpv6msg_statistics);
@@ -715,7 +719,9 @@ static void cleanup_ipv6_mibs(void)
 	snmp_mib_free((void **)icmpv6_statistics);
 	snmp_mib_free((void **)icmpv6msg_statistics);
 	snmp_mib_free((void **)udp_stats_in6);
+#ifdef CONFIG_IP_UDPLITE
 	snmp_mib_free((void **)udplite_stats_in6);
+#endif
 }
 
 static int inet6_net_init(struct net *net)
@@ -760,9 +766,11 @@ static int __init inet6_init(void)
 	if (err)
 		goto out_unregister_tcp_proto;
 
+#ifdef CONFIG_IP_UDPLITE
 	err = proto_register(&udplitev6_prot, 1);
 	if (err)
 		goto out_unregister_udp_proto;
+#endif
 
 	err = proto_register(&rawv6_prot, 1);
 	if (err)
@@ -933,8 +941,10 @@ out_sock_register_fail:
 out_unregister_raw_proto:
 	proto_unregister(&rawv6_prot);
 out_unregister_udplite_proto:
+#ifdef CONFIG_IP_UDPLITE
 	proto_unregister(&udplitev6_prot);
 out_unregister_udp_proto:
+#endif
 	proto_unregister(&udpv6_prot);
 out_unregister_tcp_proto:
 	proto_unregister(&tcpv6_prot);
@@ -950,7 +960,9 @@ static void __exit inet6_exit(void)
 	rtnl_unregister_all(PF_INET6);
 
 	udpv6_exit();
+#ifdef CONFIG_IP_UDPLITE
 	udplitev6_exit();
+#endif
 	tcpv6_exit();
 
 	/* Cleanup code parts. */
@@ -982,7 +994,9 @@ static void __exit inet6_exit(void)
 	unregister_pernet_subsys(&inet6_net_ops);
 	cleanup_ipv6_mibs();
 	proto_unregister(&rawv6_prot);
+#ifdef CONFIG_IP_UDPLITE
 	proto_unregister(&udplitev6_prot);
+#endif
 	proto_unregister(&udpv6_prot);
 	proto_unregister(&tcpv6_prot);
 }
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index bf2a686aa13d..0a18fecb93d1 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -239,7 +239,9 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			struct sk_buff *pktopt;
 
 			if (sk->sk_protocol != IPPROTO_UDP &&
+#ifdef CONFIG_IP_UDPLITE
 			    sk->sk_protocol != IPPROTO_UDPLITE &&
+#endif
 			    sk->sk_protocol != IPPROTO_TCP)
 				break;
 
@@ -279,7 +281,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			} else {
 				struct proto *prot = &udp_prot;
 
-				if (sk->sk_protocol == IPPROTO_UDPLITE)
+				if (IS_PROTO_UDPLITE(sk->sk_protocol))
 					prot = &udplite_prot;
 				local_bh_disable();
 				sock_prot_inuse_add(sk->sk_prot, -1);
@@ -844,7 +846,9 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 	switch (optname) {
 	case IPV6_ADDRFORM:
 		if (sk->sk_protocol != IPPROTO_UDP &&
+#ifdef CONFIG_IP_UDPLITE
 		    sk->sk_protocol != IPPROTO_UDPLITE &&
+#endif
 		    sk->sk_protocol != IPPROTO_TCP)
 			return -EINVAL;
 		if (sk->sk_state != TCP_ESTABLISHED)
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 199ef379e501..5ba7ae849d04 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -39,8 +39,10 @@ static int sockstat6_seq_show(struct seq_file *seq, void *v)
 		       sock_prot_inuse_get(&tcpv6_prot));
 	seq_printf(seq, "UDP6: inuse %d\n",
 		       sock_prot_inuse_get(&udpv6_prot));
+#ifdef CONFIG_IP_UDPLITE
 	seq_printf(seq, "UDPLITE6: inuse %d\n",
 			sock_prot_inuse_get(&udplitev6_prot));
+#endif
 	seq_printf(seq, "RAW6: inuse %d\n",
 		       sock_prot_inuse_get(&rawv6_prot));
 	seq_printf(seq, "FRAG6: inuse %d memory %d\n",
@@ -111,6 +113,7 @@ static struct snmp_mib snmp6_udp6_list[] = {
 	SNMP_MIB_SENTINEL
 };
 
+#ifdef CONFIG_IP_UDPLITE
 static struct snmp_mib snmp6_udplite6_list[] = {
 	SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
 	SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
@@ -118,6 +121,7 @@ static struct snmp_mib snmp6_udplite6_list[] = {
 	SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 	SNMP_MIB_SENTINEL
 };
+#endif
 
 static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, void **mib)
 {
@@ -176,7 +180,9 @@ static int snmp6_seq_show(struct seq_file *seq, void *v)
 		snmp6_seq_show_item(seq, (void **)icmpv6_statistics, snmp6_icmp6_list);
 		snmp6_seq_show_icmpv6msg(seq, (void **)icmpv6msg_statistics);
 		snmp6_seq_show_item(seq, (void **)udp_stats_in6, snmp6_udp6_list);
+#ifdef CONFIG_IP_UDPLITE
 		snmp6_seq_show_item(seq, (void **)udplite_stats_in6, snmp6_udplite6_list);
+#endif
 	}
 	return 0;
 }
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 53739de829db..55feac7ba717 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -400,7 +400,7 @@ static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
 	UDP_SKB_CB(skb)->partial_cov = 0;
 	UDP_SKB_CB(skb)->cscov = skb->len;
 
-	if (proto == IPPROTO_UDPLITE) {
+	if (IS_PROTO_UDPLITE(proto)) {
 		err = udplite_checksum_init(skb, uh);
 		if (err)
 			return err;
@@ -489,7 +489,7 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 
 		if (udp_lib_checksum_complete(skb))
 			goto discard;
-		UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
+		UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
 
 		icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
 
@@ -510,11 +510,11 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 
 short_packet:
 	LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
-		       proto == IPPROTO_UDPLITE ? "-Lite" : "",
+		       IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
 		       ulen, skb->len);
 
 discard:
-	UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
+	UDP6_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
 	kfree_skb(skb);
 	return 0;
 }
@@ -890,7 +890,7 @@ int udpv6_destroy_sock(struct sock *sk)
 int udpv6_setsockopt(struct sock *sk, int level, int optname,
 		     char __user *optval, int optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
 					  udp_v6_push_pending_frames);
 	return ipv6_setsockopt(sk, level, optname, optval, optlen);
@@ -900,7 +900,7 @@ int udpv6_setsockopt(struct sock *sk, int level, int optname,
 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
 			    char __user *optval, int optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_setsockopt(sk, level, optname, optval, optlen,
 					  udp_v6_push_pending_frames);
 	return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
@@ -910,7 +910,7 @@ int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
 int udpv6_getsockopt(struct sock *sk, int level, int optname,
 		     char __user *optval, int __user *optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
 	return ipv6_getsockopt(sk, level, optname, optval, optlen);
 }
@@ -919,7 +919,7 @@ int udpv6_getsockopt(struct sock *sk, int level, int optname,
 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
 			    char __user *optval, int __user *optlen)
 {
-	if (level == SOL_UDP  ||  level == SOL_UDPLITE)
+	if (IS_SOL_UDPFAMILY(level))
 		return udp_lib_getsockopt(sk, level, optname, optval, optlen);
 	return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
 }