Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[platform/kernel/linux-exynos.git] / net / ipv4 / udplite.c
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         .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 };
66 EXPORT_SYMBOL(udplite_prot);
67
68 static 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
78 static 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
86 static 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
96 static int __net_init udplite4_proc_init_net(struct net *net)
97 {
98         return udp_proc_register(net, &udplite4_seq_afinfo);
99 }
100
101 static void __net_exit udplite4_proc_exit_net(struct net *net)
102 {
103         udp_proc_unregister(net, &udplite4_seq_afinfo);
104 }
105
106 static struct pernet_operations udplite4_net_ops = {
107         .init = udplite4_proc_init_net,
108         .exit = udplite4_proc_exit_net,
109 };
110
111 static __init int udplite4_proc_init(void)
112 {
113         return register_pernet_subsys(&udplite4_net_ops);
114 }
115 #else
116 static inline int udplite4_proc_init(void)
117 {
118         return 0;
119 }
120 #endif
121
122 void __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
137 out_unregister_proto:
138         proto_unregister(&udplite_prot);
139 out_register_err:
140         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
141 }