[UDP]: Revert udplite and code split.

This reverts commit db1ed684f6c430c4cdad67d058688b8a1b5e607c ("[IPV6]
UDP: Rename IPv6 UDP files."), commit
8be8af8fa4405652e6c0797db5465a4be8afb998 ("[IPV4] UDP: Move
IPv4-specific bits to other file.") and commit
e898d4db2749c6052072e9bc4448e396cbdeb06a ("[UDP]: Allow users to
configure UDP-Lite.").

First, udplite is of such small cost, and it is a core protocol just
like TCP and normal UDP are.

We spent enormous amounts of effort to make udplite share as much code
with core UDP as possible.  All of that work is less valuable if we're
just going to slap a config option on udplite support.

It is also causing build failures, as reported on linux-next, showing
that the changeset was not tested very well.  In fact, this is the
second build failure resulting from the udplite change.

Finally, the config options provided was a bool, instead of a modular
option.  Meaning the udplite code does not even get build tested
by allmodconfig builds, and furthermore the user is not presented
with a reasonable modular build option which is particularly needed
by distribution vendors.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 2 insertions, 27 deletions

diff --git a/include/linux/udp.h b/include/linux/udp.h
index 4144664..1e7b7cb 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -70,10 +70,8 @@ struct udp_sock {
 #define UDPLITE_BIT      0x1  		/* set by udplite proto init function */
 #define UDPLITE_SEND_CC  0x2  		/* set via udplite setsockopt         */
 #define UDPLITE_RECV_CC  0x4		/* set via udplite setsocktopt        */
-#ifdef CONFIG_IP_UDPLITE
 	__u8		 pcflag;        /* marks socket as UDP-Lite if > 0    */
 	__u8		 unused[3];
-#endif
 	/*
 	 * For encapsulation sockets.
 	 */
@@ -85,15 +83,7 @@ static inline struct udp_sock *udp_sk(const struct sock *sk)
 	return (struct udp_sock *)sk;
 }
 
-#ifdef CONFIG_IP_UDPLITE
 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
-#define IS_PROTO_UDPLITE(__proto) ((__proto) == IPPROTO_UDPLITE)
-#define IS_SOL_UDPFAMILY(level) ((level) == SOL_UDP || (level) == SOL_UDPLITE)
-#else
-#define IS_UDPLITE(__sk) 0
-#define IS_PROTO_UDPLITE(__proto) 0
-#define IS_SOL_UDPFAMILY(level) ((level) == SOL_UDP)
-#endif
 
 #endif
 
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 5f6df50..8db06af 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -599,13 +599,8 @@ extern int  tcp6_proc_init(void);
 extern void tcp6_proc_exit(void);
 extern int  udp6_proc_init(void);
 extern void udp6_proc_exit(void);
-#ifdef CONFIG_IP_UDPLITE
 extern int  udplite6_proc_init(void);
 extern void udplite6_proc_exit(void);
-#else
-static inline int udplite6_proc_init(void) { return 0; }
-static inline void udplite6_proc_exit(void) { }
-#endif
 extern int  ipv6_misc_proc_init(void);
 extern void ipv6_misc_proc_exit(void);
 extern int snmp6_register_dev(struct inet6_dev *idev);
diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index 902e6c6..27394e0 100644
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -27,13 +27,8 @@ extern int				rawv6_init(void);
 extern void				rawv6_exit(void);
 extern int				udpv6_init(void);
 extern void				udpv6_exit(void);
-#ifdef CONFIG_IP_UDPLITE
 extern int 				udplitev6_init(void);
 extern void 				udplitev6_exit(void);
-#else
-static inline int udplitev6_init(void) { return 0; }
-static inline void udplitev6_exit(void) { }
-#endif
 extern int				tcpv6_init(void);
 extern void				tcpv6_exit(void);
 
diff --git a/include/net/udplite.h b/include/net/udplite.h
index 01ddb2c..b76b2e3 100644
--- a/include/net/udplite.h
+++ b/include/net/udplite.h
@@ -25,9 +25,7 @@ static __inline__ int udplite_getfrag(void *from, char *to, int  offset,
 /* Designate sk as UDP-Lite socket */
 static inline int udplite_sk_init(struct sock *sk)
 {
-#ifdef CONFIG_IP_UDPLITE
 	udp_sk(sk)->pcflag = UDPLITE_BIT;
-#endif
 	return 0;
 }
 
@@ -71,7 +69,7 @@ static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh)
 static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
 {
 	int cscov = up->len;
-#ifdef CONFIG_IP_UDPLITE
+
 	/*
 	 * Sender has set `partial coverage' option on UDP-Lite socket
 	 */
@@ -95,15 +93,13 @@ static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
 	 *       illegal, we fall back to the defaults here.
 	 */
 	}
-#endif
 	return cscov;
 }
 
 static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
 {
-	__wsum csum = 0;
-#ifdef CONFIG_IP_UDPLITE
 	int cscov = udplite_sender_cscov(udp_sk(sk), udp_hdr(skb));
+	__wsum csum = 0;
 
 	skb->ip_summed = CHECKSUM_NONE;     /* no HW support for checksumming */
 
@@ -116,7 +112,6 @@ static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
 		if ((cscov -= len) <= 0)
 			break;
 	}
-#endif
 	return csum;
 }