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Linux kernel mirror (for testing)
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kernel
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linux
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"
16DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics) __read_mostly;
17
18struct hlist_head udplite_hash[UDP_HTABLE_SIZE];
19
20int 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
26static 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
31static int udplite_rcv(struct sk_buff *skb)
32{
33 return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
34}
35
36static void udplite_err(struct sk_buff *skb, u32 info)
37{
38 __udp4_lib_err(skb, info, udplite_hash);
39}
40
41static struct net_protocol udplite_protocol = {
42 .handler = udplite_rcv,
43 .err_handler = udplite_err,
44 .no_policy = 1,
45};
46
47DEFINE_PROTO_INUSE(udplite)
48
49struct 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
75static 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
86static struct file_operations udplite4_seq_fops;
87static 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
97void __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
113out_unregister_proto:
114 proto_unregister(&udplite_prot);
115out_register_err:
116 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
117}
118
119EXPORT_SYMBOL(udplite_hash);
120EXPORT_SYMBOL(udplite_prot);
121EXPORT_SYMBOL(udplite_get_port);