53f3ed496328a44208a35c0c120adc88eda0550b
[linux-2.6.git] / net / ipv4 / udplite.c
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 static int udplite_rcv(struct sk_buff *skb)
21 {
22         return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
23 }
24
25 static void udplite_err(struct sk_buff *skb, u32 info)
26 {
27         __udp4_lib_err(skb, info, udplite_hash);
28 }
29
30 static  struct net_protocol udplite_protocol = {
31         .handler        = udplite_rcv,
32         .err_handler    = udplite_err,
33         .no_policy      = 1,
34         .netns_ok       = 1,
35 };
36
37 DEFINE_PROTO_INUSE(udplite)
38
39 struct proto    udplite_prot = {
40         .name              = "UDP-Lite",
41         .owner             = THIS_MODULE,
42         .close             = udp_lib_close,
43         .connect           = ip4_datagram_connect,
44         .disconnect        = udp_disconnect,
45         .ioctl             = udp_ioctl,
46         .init              = udplite_sk_init,
47         .destroy           = udp_destroy_sock,
48         .setsockopt        = udp_setsockopt,
49         .getsockopt        = udp_getsockopt,
50         .sendmsg           = udp_sendmsg,
51         .recvmsg           = udp_recvmsg,
52         .sendpage          = udp_sendpage,
53         .backlog_rcv       = udp_queue_rcv_skb,
54         .hash              = udp_lib_hash,
55         .unhash            = udp_lib_unhash,
56         .get_port          = udp_v4_get_port,
57         .obj_size          = sizeof(struct udp_sock),
58         .h.udp_hash        = udplite_hash,
59 #ifdef CONFIG_COMPAT
60         .compat_setsockopt = compat_udp_setsockopt,
61         .compat_getsockopt = compat_udp_getsockopt,
62 #endif
63         REF_PROTO_INUSE(udplite)
64 };
65
66 static struct inet_protosw udplite4_protosw = {
67         .type           =  SOCK_DGRAM,
68         .protocol       =  IPPROTO_UDPLITE,
69         .prot           =  &udplite_prot,
70         .ops            =  &inet_dgram_ops,
71         .capability     = -1,
72         .no_check       =  0,           /* must checksum (RFC 3828) */
73         .flags          =  INET_PROTOSW_PERMANENT,
74 };
75
76 #ifdef CONFIG_PROC_FS
77 static struct file_operations udplite4_seq_fops;
78 static struct udp_seq_afinfo udplite4_seq_afinfo = {
79         .owner          = THIS_MODULE,
80         .name           = "udplite",
81         .family         = AF_INET,
82         .hashtable      = udplite_hash,
83         .seq_show       = udp4_seq_show,
84         .seq_fops       = &udplite4_seq_fops,
85 };
86
87 static int udplite4_proc_init_net(struct net *net)
88 {
89         return udp_proc_register(net, &udplite4_seq_afinfo);
90 }
91
92 static void udplite4_proc_exit_net(struct net *net)
93 {
94         udp_proc_unregister(net, &udplite4_seq_afinfo);
95 }
96
97 static struct pernet_operations udplite4_net_ops = {
98         .init = udplite4_proc_init_net,
99         .exit = udplite4_proc_exit_net,
100 };
101
102 static __init int udplite4_proc_init(void)
103 {
104         return register_pernet_subsys(&udplite4_net_ops);
105 }
106 #else
107 static inline int udplite4_proc_init(void)
108 {
109         return 0;
110 }
111 #endif
112
113 void __init udplite4_register(void)
114 {
115         if (proto_register(&udplite_prot, 1))
116                 goto out_register_err;
117
118         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
119                 goto out_unregister_proto;
120
121         inet_register_protosw(&udplite4_protosw);
122
123         if (udplite4_proc_init())
124                 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
125         return;
126
127 out_unregister_proto:
128         proto_unregister(&udplite_prot);
129 out_register_err:
130         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
131 }
132
133 EXPORT_SYMBOL(udplite_hash);
134 EXPORT_SYMBOL(udplite_prot);