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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
19 struct udp_table udplite_table __read_mostly;
20 EXPORT_SYMBOL(udplite_table);
21
22 static int udplite_rcv(struct sk_buff *skb)
23 {
24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25 }
26
27 static void udplite_err(struct sk_buff *skb, u32 info)
28 {
29 __udp4_lib_err(skb, info, &udplite_table);
30 }
31
32 static 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
39 struct 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 .h.udp_table = &udplite_table,
59 #ifdef CONFIG_COMPAT
60 .compat_setsockopt = compat_udp_setsockopt,
61 .compat_getsockopt = compat_udp_getsockopt,
62 #endif
63 };
64 EXPORT_SYMBOL(udplite_prot);
65
66 static struct inet_protosw udplite4_protosw = {
67 .type = SOCK_DGRAM,
68 .protocol = IPPROTO_UDPLITE,
69 .prot = &udplite_prot,
70 .ops = &inet_dgram_ops,
71 .flags = INET_PROTOSW_PERMANENT,
72 };
73
74 #ifdef CONFIG_PROC_FS
75
76 static const struct file_operations udplite_afinfo_seq_fops = {
77 .owner = THIS_MODULE,
78 .open = udp_seq_open,
79 .read = seq_read,
80 .llseek = seq_lseek,
81 .release = seq_release_net
82 };
83
84 static 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
94 static int __net_init udplite4_proc_init_net(struct net *net)
95 {
96 return udp_proc_register(net, &udplite4_seq_afinfo);
97 }
98
99 static void __net_exit udplite4_proc_exit_net(struct net *net)
100 {
101 udp_proc_unregister(net, &udplite4_seq_afinfo);
102 }
103
104 static struct pernet_operations udplite4_net_ops = {
105 .init = udplite4_proc_init_net,
106 .exit = udplite4_proc_exit_net,
107 };
108
109 static __init int udplite4_proc_init(void)
110 {
111 return register_pernet_subsys(&udplite4_net_ops);
112 }
113 #else
114 static inline int udplite4_proc_init(void)
115 {
116 return 0;
117 }
118 #endif
119
120 void __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
135 out_unregister_proto:
136 proto_unregister(&udplite_prot);
137 out_register_err:
138 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
139 }