xref: /openbmc/linux/net/ipv4/udplite.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 static int		udplite_port_rover;
20 
21 int udplite_get_port(struct sock *sk, unsigned short p,
22 		     const struct udp_get_port_ops *ops)
23 {
24 	return  __udp_lib_get_port(sk, p, udplite_hash,
25 				   &udplite_port_rover, ops);
26 }
27 
28 static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
29 {
30 	return udplite_get_port(sk, snum, &udp_ipv4_ops);
31 }
32 
33 static int udplite_rcv(struct sk_buff *skb)
34 {
35 	return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
36 }
37 
38 static void udplite_err(struct sk_buff *skb, u32 info)
39 {
40 	return __udp4_lib_err(skb, info, udplite_hash);
41 }
42 
43 static	struct net_protocol udplite_protocol = {
44 	.handler	= udplite_rcv,
45 	.err_handler	= udplite_err,
46 	.no_policy	= 1,
47 };
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 };
73 
74 static struct inet_protosw udplite4_protosw = {
75 	.type		=  SOCK_DGRAM,
76 	.protocol	=  IPPROTO_UDPLITE,
77 	.prot		=  &udplite_prot,
78 	.ops		=  &inet_dgram_ops,
79 	.capability	= -1,
80 	.no_check	=  0,		/* must checksum (RFC 3828) */
81 	.flags		=  INET_PROTOSW_PERMANENT,
82 };
83 
84 #ifdef CONFIG_PROC_FS
85 static struct file_operations udplite4_seq_fops;
86 static struct udp_seq_afinfo udplite4_seq_afinfo = {
87 	.owner		= THIS_MODULE,
88 	.name		= "udplite",
89 	.family		= AF_INET,
90 	.hashtable	= udplite_hash,
91 	.seq_show	= udp4_seq_show,
92 	.seq_fops	= &udplite4_seq_fops,
93 };
94 #endif
95 
96 void __init udplite4_register(void)
97 {
98 	if (proto_register(&udplite_prot, 1))
99 		goto out_register_err;
100 
101 	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
102 		goto out_unregister_proto;
103 
104 	inet_register_protosw(&udplite4_protosw);
105 
106 #ifdef CONFIG_PROC_FS
107 	if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
108 		printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
109 #endif
110 	return;
111 
112 out_unregister_proto:
113 	proto_unregister(&udplite_prot);
114 out_register_err:
115 	printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
116 }
117 
118 EXPORT_SYMBOL(udplite_hash);
119 EXPORT_SYMBOL(udplite_prot);
120 EXPORT_SYMBOL(udplite_get_port);
121