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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 return __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
47struct proto udplite_prot = {
48 .name = "UDP-Lite",
49 .owner = THIS_MODULE,
50 .close = udp_lib_close,
51 .connect = ip4_datagram_connect,
52 .disconnect = udp_disconnect,
53 .ioctl = udp_ioctl,
54 .init = udplite_sk_init,
55 .destroy = udp_destroy_sock,
56 .setsockopt = udp_setsockopt,
57 .getsockopt = udp_getsockopt,
58 .sendmsg = udp_sendmsg,
59 .recvmsg = udp_recvmsg,
60 .sendpage = udp_sendpage,
61 .backlog_rcv = udp_queue_rcv_skb,
62 .hash = udp_lib_hash,
63 .unhash = udp_lib_unhash,
64 .get_port = udplite_v4_get_port,
65 .obj_size = sizeof(struct udp_sock),
66#ifdef CONFIG_COMPAT
67 .compat_setsockopt = compat_udp_setsockopt,
68 .compat_getsockopt = compat_udp_getsockopt,
69#endif
70};
71
72static struct inet_protosw udplite4_protosw = {
73 .type = SOCK_DGRAM,
74 .protocol = IPPROTO_UDPLITE,
75 .prot = &udplite_prot,
76 .ops = &inet_dgram_ops,
77 .capability = -1,
78 .no_check = 0, /* must checksum (RFC 3828) */
79 .flags = INET_PROTOSW_PERMANENT,
80};
81
82#ifdef CONFIG_PROC_FS
83static struct file_operations udplite4_seq_fops;
84static struct udp_seq_afinfo udplite4_seq_afinfo = {
85 .owner = THIS_MODULE,
86 .name = "udplite",
87 .family = AF_INET,
88 .hashtable = udplite_hash,
89 .seq_show = udp4_seq_show,
90 .seq_fops = &udplite4_seq_fops,
91};
92#endif
93
94void __init udplite4_register(void)
95{
96 if (proto_register(&udplite_prot, 1))
97 goto out_register_err;
98
99 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
100 goto out_unregister_proto;
101
102 inet_register_protosw(&udplite4_protosw);
103
104#ifdef CONFIG_PROC_FS
105 if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
106 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
107#endif
108 return;
109
110out_unregister_proto:
111 proto_unregister(&udplite_prot);
112out_register_err:
113 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
114}
115
116EXPORT_SYMBOL(udplite_hash);
117EXPORT_SYMBOL(udplite_prot);
118EXPORT_SYMBOL(udplite_get_port);