[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>

1 files changed, 121 insertions, 0 deletions

diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
new file mode 100644
index 000000000000..d49c6d68c8a9
--- /dev/null
+++ b/net/ipv4/udplite.c
@@ -0,0 +1,121 @@
+/*
+ *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
+ *
+ *  Version:    $Id: udplite.c,v 1.25 2006/10/19 07:22:36 gerrit Exp $
+ *
+ *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
+ *
+ *  Changes:
+ *  Fixes:
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+#include "udp_impl.h"
+DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics)    __read_mostly;
+
+struct hlist_head       udplite_hash[UDP_HTABLE_SIZE];
+
+int udplite_get_port(struct sock *sk, unsigned short p,
+                     int (*c)(const struct sock *, const struct sock *))
+{
+        return  __udp_lib_get_port(sk, p, udplite_hash, c);
+}
+
+static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
+{
+        return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
+}
+
+static int udplite_rcv(struct sk_buff *skb)
+{
+        return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
+}
+
+static void udplite_err(struct sk_buff *skb, u32 info)
+{
+        __udp4_lib_err(skb, info, udplite_hash);
+}
+
+static  struct net_protocol udplite_protocol = {
+        .handler        = udplite_rcv,
+        .err_handler    = udplite_err,
+        .no_policy      = 1,
+};
+
+DEFINE_PROTO_INUSE(udplite)
+
+struct proto    udplite_prot = {
+        .name              = "UDP-Lite",
+        .owner             = THIS_MODULE,
+        .close             = udp_lib_close,
+        .connect           = ip4_datagram_connect,
+        .disconnect        = udp_disconnect,
+        .ioctl             = udp_ioctl,
+        .init              = udplite_sk_init,
+        .destroy           = udp_destroy_sock,
+        .setsockopt        = udp_setsockopt,
+        .getsockopt        = udp_getsockopt,
+        .sendmsg           = udp_sendmsg,
+        .recvmsg           = udp_recvmsg,
+        .sendpage          = udp_sendpage,
+        .backlog_rcv       = udp_queue_rcv_skb,
+        .hash              = udp_lib_hash,
+        .unhash            = udp_lib_unhash,
+        .get_port          = udplite_v4_get_port,
+        .obj_size          = sizeof(struct udp_sock),
+#ifdef CONFIG_COMPAT
+        .compat_setsockopt = compat_udp_setsockopt,
+        .compat_getsockopt = compat_udp_getsockopt,
+#endif
+        REF_PROTO_INUSE(udplite)
+};
+
+static struct inet_protosw udplite4_protosw = {
+        .type           =  SOCK_DGRAM,
+        .protocol       =  IPPROTO_UDPLITE,
+        .prot           =  &udplite_prot,
+        .ops            =  &inet_dgram_ops,
+        .capability     = -1,
+        .no_check       =  0,           /* must checksum (RFC 3828) */
+        .flags          =  INET_PROTOSW_PERMANENT,
+};
+
+#ifdef CONFIG_PROC_FS
+static struct file_operations udplite4_seq_fops;
+static struct udp_seq_afinfo udplite4_seq_afinfo = {
+        .owner          = THIS_MODULE,
+        .name           = "udplite",
+        .family         = AF_INET,
+        .hashtable      = udplite_hash,
+        .seq_show       = udp4_seq_show,
+        .seq_fops       = &udplite4_seq_fops,
+};
+#endif
+
+void __init udplite4_register(void)
+{
+        if (proto_register(&udplite_prot, 1))
+                goto out_register_err;
+
+        if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
+                goto out_unregister_proto;
+
+        inet_register_protosw(&udplite4_protosw);
+
+#ifdef CONFIG_PROC_FS
+        if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
+                printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
+#endif
+        return;
+
+out_unregister_proto:
+        proto_unregister(&udplite_prot);
+out_register_err:
+        printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
+}
+
+EXPORT_SYMBOL(udplite_hash);
+EXPORT_SYMBOL(udplite_prot);
+EXPORT_SYMBOL(udplite_get_port);