Merge tag 'for-linus-5.0' of git://github.com/cminyard/linux-ipmi
[sfrench/cifs-2.6.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 <linux/proc_fs.h>
18 #include "udp_impl.h"
19
20 struct udp_table        udplite_table __read_mostly;
21 EXPORT_SYMBOL(udplite_table);
22
23 static int udplite_rcv(struct sk_buff *skb)
24 {
25         return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
26 }
27
28 static int udplite_err(struct sk_buff *skb, u32 info)
29 {
30         return __udp4_lib_err(skb, info, &udplite_table);
31 }
32
33 static 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
40 struct 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 };
67 EXPORT_SYMBOL(udplite_prot);
68
69 static 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
78 static struct udp_seq_afinfo udplite4_seq_afinfo = {
79         .family         = AF_INET,
80         .udp_table      = &udplite_table,
81 };
82
83 static 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
91 static void __net_exit udplite4_proc_exit_net(struct net *net)
92 {
93         remove_proc_entry("udplite", net->proc_net);
94 }
95
96 static struct pernet_operations udplite4_net_ops = {
97         .init = udplite4_proc_init_net,
98         .exit = udplite4_proc_exit_net,
99 };
100
101 static __init int udplite4_proc_init(void)
102 {
103         return register_pernet_subsys(&udplite4_net_ops);
104 }
105 #else
106 static inline int udplite4_proc_init(void)
107 {
108         return 0;
109 }
110 #endif
111
112 void __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
127 out_unregister_proto:
128         proto_unregister(&udplite_prot);
129 out_register_err:
130         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
131 }