Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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 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", __func__);
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", __func__);
117 }
118
119 EXPORT_SYMBOL(udplite_hash);
120 EXPORT_SYMBOL(udplite_prot);
121 EXPORT_SYMBOL(udplite_get_port);