1/*
2 *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
3 *
4 *  Version:    $Id: udplite.c,v 1.1.1.1 2007/08/03 18:53:51 Exp $
5 *
6 *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
7 *
8 *  Changes:
9 *  Fixes:
10 *		This program is free software; you can redistribute it and/or
11 *		modify it under the terms of the GNU General Public License
12 *		as published by the Free Software Foundation; either version
13 *		2 of the License, or (at your option) any later version.
14 */
15#include "udp_impl.h"
16DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics)	__read_mostly;
17
18struct hlist_head 	udplite_hash[UDP_HTABLE_SIZE];
19static int		udplite_port_rover;
20
21int udplite_get_port(struct sock *sk, unsigned short p,
22		     int (*c)(const struct sock *, const struct sock *))
23{
24	return  __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c);
25}
26
27static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
28{
29	return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
30}
31
32static int udplite_rcv(struct sk_buff *skb)
33{
34	return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
35}
36
37static void udplite_err(struct sk_buff *skb, u32 info)
38{
39	return __udp4_lib_err(skb, info, udplite_hash);
40}
41
42static	struct net_protocol udplite_protocol = {
43	.handler	= udplite_rcv,
44	.err_handler	= udplite_err,
45	.no_policy	= 1,
46};
47
48struct proto 	udplite_prot = {
49	.name		   = "UDP-Lite",
50	.owner		   = THIS_MODULE,
51	.close		   = udp_lib_close,
52	.connect	   = ip4_datagram_connect,
53	.disconnect	   = udp_disconnect,
54	.ioctl		   = udp_ioctl,
55	.init		   = udplite_sk_init,
56	.destroy	   = udp_destroy_sock,
57	.setsockopt	   = udp_setsockopt,
58	.getsockopt	   = udp_getsockopt,
59	.sendmsg	   = udp_sendmsg,
60	.recvmsg	   = udp_recvmsg,
61	.sendpage	   = udp_sendpage,
62	.backlog_rcv	   = udp_queue_rcv_skb,
63	.hash		   = udp_lib_hash,
64	.unhash		   = udp_lib_unhash,
65	.get_port	   = udplite_v4_get_port,
66	.obj_size	   = sizeof(struct udp_sock),
67#ifdef CONFIG_COMPAT
68	.compat_setsockopt = compat_udp_setsockopt,
69	.compat_getsockopt = compat_udp_getsockopt,
70#endif
71};
72
73static struct inet_protosw udplite4_protosw = {
74	.type		=  SOCK_DGRAM,
75	.protocol	=  IPPROTO_UDPLITE,
76	.prot		=  &udplite_prot,
77	.ops		=  &inet_dgram_ops,
78	.capability	= -1,
79	.no_check	=  0,		/* must checksum (RFC 3828) */
80	.flags		=  INET_PROTOSW_PERMANENT,
81};
82
83#ifdef CONFIG_PROC_FS
84static struct file_operations udplite4_seq_fops;
85static struct udp_seq_afinfo udplite4_seq_afinfo = {
86	.owner		= THIS_MODULE,
87	.name		= "udplite",
88	.family		= AF_INET,
89	.hashtable	= udplite_hash,
90	.seq_show	= udp4_seq_show,
91	.seq_fops	= &udplite4_seq_fops,
92};
93#endif
94
95void __init udplite4_register(void)
96{
97	if (proto_register(&udplite_prot, 1))
98		goto out_register_err;
99
100	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
101		goto out_unregister_proto;
102
103	inet_register_protosw(&udplite4_protosw);
104
105#ifdef CONFIG_PROC_FS
106	if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
107		printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
108#endif
109	return;
110
111out_unregister_proto:
112	proto_unregister(&udplite_prot);
113out_register_err:
114	printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
115}
116
117EXPORT_SYMBOL(udplite_hash);
118EXPORT_SYMBOL(udplite_prot);
119EXPORT_SYMBOL(udplite_get_port);
120