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 <linux/proc_fs.h>
18#include "udp_impl.h"
19
20struct udp_table udplite_table __read_mostly;
21EXPORT_SYMBOL(udplite_table);
22
23static int udplite_rcv(struct sk_buff *skb)
24{
25 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
26}
27
28static int udplite_err(struct sk_buff *skb, u32 info)
29{
30 return __udp4_lib_err(skb, info, &udplite_table);
31}
32
33static const struct net_protocol udplite_protocol = {
34 .handler = udplite_rcv,
35 .err_handler = udplite_err,
36 .no_policy = 1,
37 .netns_ok = 1,
38};
39
40struct proto udplite_prot = {
41 .name = "UDP-Lite",
42 .owner = THIS_MODULE,
43 .close = udp_lib_close,
44 .connect = ip4_datagram_connect,
45 .disconnect = udp_disconnect,
46 .ioctl = udp_ioctl,
47 .init = udplite_sk_init,
48 .destroy = udp_destroy_sock,
49 .setsockopt = udp_setsockopt,
50 .getsockopt = udp_getsockopt,
51 .sendmsg = udp_sendmsg,
52 .recvmsg = udp_recvmsg,
53 .sendpage = udp_sendpage,
54 .hash = udp_lib_hash,
55 .unhash = udp_lib_unhash,
56 .rehash = udp_v4_rehash,
57 .get_port = udp_v4_get_port,
58 .memory_allocated = &udp_memory_allocated,
59 .sysctl_mem = sysctl_udp_mem,
60 .obj_size = sizeof(struct udp_sock),
61 .h.udp_table = &udplite_table,
62#ifdef CONFIG_COMPAT
63 .compat_setsockopt = compat_udp_setsockopt,
64 .compat_getsockopt = compat_udp_getsockopt,
65#endif
66};
67EXPORT_SYMBOL(udplite_prot);
68
69static struct inet_protosw udplite4_protosw = {
70 .type = SOCK_DGRAM,
71 .protocol = IPPROTO_UDPLITE,
72 .prot = &udplite_prot,
73 .ops = &inet_dgram_ops,
74 .flags = INET_PROTOSW_PERMANENT,
75};
76
77#ifdef CONFIG_PROC_FS
78static struct udp_seq_afinfo udplite4_seq_afinfo = {
79 .family = AF_INET,
80 .udp_table = &udplite_table,
81};
82
83static int __net_init udplite4_proc_init_net(struct net *net)
84{
85 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
86 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
87 return -ENOMEM;
88 return 0;
89}
90
91static void __net_exit udplite4_proc_exit_net(struct net *net)
92{
93 remove_proc_entry("udplite", net->proc_net);
94}
95
96static struct pernet_operations udplite4_net_ops = {
97 .init = udplite4_proc_init_net,
98 .exit = udplite4_proc_exit_net,
99};
100
101static __init int udplite4_proc_init(void)
102{
103 return register_pernet_subsys(&udplite4_net_ops);
104}
105#else
106static inline int udplite4_proc_init(void)
107{
108 return 0;
109}
110#endif
111
112void __init udplite4_register(void)
113{
114 udp_table_init(&udplite_table, "UDP-Lite");
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 pr_err("%s: Cannot register /proc!\n", __func__);
125 return;
126
127out_unregister_proto:
128 proto_unregister(&udplite_prot);
129out_register_err:
130 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
131}
132