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	.backlog_rcv	   = udp_queue_rcv_skb,
54	.hash		   = udp_lib_hash,
55	.unhash		   = udp_lib_unhash,
56	.get_port	   = udp_v4_get_port,
57	.obj_size	   = sizeof(struct udp_sock),
58	.slab_flags	   = SLAB_DESTROY_BY_RCU,
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	.clear_sk	   = sk_prot_clear_portaddr_nulls,
65};
66EXPORT_SYMBOL(udplite_prot);
67
68static struct inet_protosw udplite4_protosw = {
69	.type		=  SOCK_DGRAM,
70	.protocol	=  IPPROTO_UDPLITE,
71	.prot		=  &udplite_prot,
72	.ops		=  &inet_dgram_ops,
73	.flags		=  INET_PROTOSW_PERMANENT,
74};
75
76#ifdef CONFIG_PROC_FS
77
78static const struct file_operations udplite_afinfo_seq_fops = {
79	.owner    = THIS_MODULE,
80	.open     = udp_seq_open,
81	.read     = seq_read,
82	.llseek   = seq_lseek,
83	.release  = seq_release_net
84};
85
86static struct udp_seq_afinfo udplite4_seq_afinfo = {
87	.name		= "udplite",
88	.family		= AF_INET,
89	.udp_table 	= &udplite_table,
90	.seq_fops	= &udplite_afinfo_seq_fops,
91	.seq_ops	= {
92		.show		= udp4_seq_show,
93	},
94};
95
96static int __net_init udplite4_proc_init_net(struct net *net)
97{
98	return udp_proc_register(net, &udplite4_seq_afinfo);
99}
100
101static void __net_exit udplite4_proc_exit_net(struct net *net)
102{
103	udp_proc_unregister(net, &udplite4_seq_afinfo);
104}
105
106static struct pernet_operations udplite4_net_ops = {
107	.init = udplite4_proc_init_net,
108	.exit = udplite4_proc_exit_net,
109};
110
111static __init int udplite4_proc_init(void)
112{
113	return register_pernet_subsys(&udplite4_net_ops);
114}
115#else
116static inline int udplite4_proc_init(void)
117{
118	return 0;
119}
120#endif
121
122void __init udplite4_register(void)
123{
124	udp_table_init(&udplite_table, "UDP-Lite");
125	if (proto_register(&udplite_prot, 1))
126		goto out_register_err;
127
128	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
129		goto out_unregister_proto;
130
131	inet_register_protosw(&udplite4_protosw);
132
133	if (udplite4_proc_init())
134		pr_err("%s: Cannot register /proc!\n", __func__);
135	return;
136
137out_unregister_proto:
138	proto_unregister(&udplite_prot);
139out_register_err:
140	pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
141}
142