xref: /openbmc/linux/net/ipv4/udplite.c (revision 643d1f7f)
1 /*
2  *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
3  *
4  *  Version:    $Id: udplite.c,v 1.25 2006/10/19 07:22:36 gerrit 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"
16 DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics)	__read_mostly;
17 
18 struct hlist_head 	udplite_hash[UDP_HTABLE_SIZE];
19 
20 int udplite_get_port(struct sock *sk, unsigned short p,
21 		     int (*c)(const struct sock *, const struct sock *))
22 {
23 	return  __udp_lib_get_port(sk, p, udplite_hash, c);
24 }
25 
26 static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
27 {
28 	return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
29 }
30 
31 static int udplite_rcv(struct sk_buff *skb)
32 {
33 	return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
34 }
35 
36 static void udplite_err(struct sk_buff *skb, u32 info)
37 {
38 	__udp4_lib_err(skb, info, udplite_hash);
39 }
40 
41 static	struct net_protocol udplite_protocol = {
42 	.handler	= udplite_rcv,
43 	.err_handler	= udplite_err,
44 	.no_policy	= 1,
45 };
46 
47 DEFINE_PROTO_INUSE(udplite)
48 
49 struct proto 	udplite_prot = {
50 	.name		   = "UDP-Lite",
51 	.owner		   = THIS_MODULE,
52 	.close		   = udp_lib_close,
53 	.connect	   = ip4_datagram_connect,
54 	.disconnect	   = udp_disconnect,
55 	.ioctl		   = udp_ioctl,
56 	.init		   = udplite_sk_init,
57 	.destroy	   = udp_destroy_sock,
58 	.setsockopt	   = udp_setsockopt,
59 	.getsockopt	   = udp_getsockopt,
60 	.sendmsg	   = udp_sendmsg,
61 	.recvmsg	   = udp_recvmsg,
62 	.sendpage	   = udp_sendpage,
63 	.backlog_rcv	   = udp_queue_rcv_skb,
64 	.hash		   = udp_lib_hash,
65 	.unhash		   = udp_lib_unhash,
66 	.get_port	   = udplite_v4_get_port,
67 	.obj_size	   = sizeof(struct udp_sock),
68 #ifdef CONFIG_COMPAT
69 	.compat_setsockopt = compat_udp_setsockopt,
70 	.compat_getsockopt = compat_udp_getsockopt,
71 #endif
72 	REF_PROTO_INUSE(udplite)
73 };
74 
75 static struct inet_protosw udplite4_protosw = {
76 	.type		=  SOCK_DGRAM,
77 	.protocol	=  IPPROTO_UDPLITE,
78 	.prot		=  &udplite_prot,
79 	.ops		=  &inet_dgram_ops,
80 	.capability	= -1,
81 	.no_check	=  0,		/* must checksum (RFC 3828) */
82 	.flags		=  INET_PROTOSW_PERMANENT,
83 };
84 
85 #ifdef CONFIG_PROC_FS
86 static struct file_operations udplite4_seq_fops;
87 static struct udp_seq_afinfo udplite4_seq_afinfo = {
88 	.owner		= THIS_MODULE,
89 	.name		= "udplite",
90 	.family		= AF_INET,
91 	.hashtable	= udplite_hash,
92 	.seq_show	= udp4_seq_show,
93 	.seq_fops	= &udplite4_seq_fops,
94 };
95 #endif
96 
97 void __init udplite4_register(void)
98 {
99 	if (proto_register(&udplite_prot, 1))
100 		goto out_register_err;
101 
102 	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
103 		goto out_unregister_proto;
104 
105 	inet_register_protosw(&udplite4_protosw);
106 
107 #ifdef CONFIG_PROC_FS
108 	if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
109 		printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
110 #endif
111 	return;
112 
113 out_unregister_proto:
114 	proto_unregister(&udplite_prot);
115 out_register_err:
116 	printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
117 }
118 
119 EXPORT_SYMBOL(udplite_hash);
120 EXPORT_SYMBOL(udplite_prot);
121 EXPORT_SYMBOL(udplite_get_port);
122