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1/*
2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
3 *
4 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
5 *
6 * Changes:
7 * Fixes:
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14#define pr_fmt(fmt) "UDPLite: " fmt
15
16#include <linux/export.h>
17#include "udp_impl.h"
18
19struct udp_table udplite_table __read_mostly;
20EXPORT_SYMBOL(udplite_table);
21
22static int udplite_rcv(struct sk_buff *skb)
23{
24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25}
26
27static void udplite_err(struct sk_buff *skb, u32 info)
28{
29 __udp4_lib_err(skb, info, &udplite_table);
30}
31
32static const struct net_protocol udplite_protocol = {
33 .handler = udplite_rcv,
34 .err_handler = udplite_err,
35 .no_policy = 1,
36 .netns_ok = 1,
37};
38
39struct 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 .hash = udp_lib_hash,
54 .unhash = udp_lib_unhash,
55 .get_port = udp_v4_get_port,
56 .memory_allocated = &udp_memory_allocated,
57 .sysctl_mem = sysctl_udp_mem,
58 .obj_size = sizeof(struct udp_sock),
59 .h.udp_table = &udplite_table,
60#ifdef CONFIG_COMPAT
61 .compat_setsockopt = compat_udp_setsockopt,
62 .compat_getsockopt = compat_udp_getsockopt,
63#endif
64};
65EXPORT_SYMBOL(udplite_prot);
66
67static struct inet_protosw udplite4_protosw = {
68 .type = SOCK_DGRAM,
69 .protocol = IPPROTO_UDPLITE,
70 .prot = &udplite_prot,
71 .ops = &inet_dgram_ops,
72 .flags = INET_PROTOSW_PERMANENT,
73};
74
75#ifdef CONFIG_PROC_FS
76
77static const struct file_operations udplite_afinfo_seq_fops = {
78 .open = udp_seq_open,
79 .read = seq_read,
80 .llseek = seq_lseek,
81 .release = seq_release_net
82};
83
84static struct udp_seq_afinfo udplite4_seq_afinfo = {
85 .name = "udplite",
86 .family = AF_INET,
87 .udp_table = &udplite_table,
88 .seq_fops = &udplite_afinfo_seq_fops,
89 .seq_ops = {
90 .show = udp4_seq_show,
91 },
92};
93
94static int __net_init udplite4_proc_init_net(struct net *net)
95{
96 return udp_proc_register(net, &udplite4_seq_afinfo);
97}
98
99static void __net_exit udplite4_proc_exit_net(struct net *net)
100{
101 udp_proc_unregister(net, &udplite4_seq_afinfo);
102}
103
104static struct pernet_operations udplite4_net_ops = {
105 .init = udplite4_proc_init_net,
106 .exit = udplite4_proc_exit_net,
107};
108
109static __init int udplite4_proc_init(void)
110{
111 return register_pernet_subsys(&udplite4_net_ops);
112}
113#else
114static inline int udplite4_proc_init(void)
115{
116 return 0;
117}
118#endif
119
120void __init udplite4_register(void)
121{
122 udp_table_init(&udplite_table, "UDP-Lite");
123 if (proto_register(&udplite_prot, 1))
124 goto out_register_err;
125
126 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
127 goto out_unregister_proto;
128
129 inet_register_protosw(&udplite4_protosw);
130
131 if (udplite4_proc_init())
132 pr_err("%s: Cannot register /proc!\n", __func__);
133 return;
134
135out_unregister_proto:
136 proto_unregister(&udplite_prot);
137out_register_err:
138 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
139}