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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
4 *
5 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
6 *
7 * Changes:
8 * Fixes:
9 */
10
11#define pr_fmt(fmt) "UDPLite: " fmt
12
13#include <linux/export.h>
14#include <linux/proc_fs.h>
15#include "udp_impl.h"
16
17struct udp_table udplite_table __read_mostly;
18EXPORT_SYMBOL(udplite_table);
19
20static int udplite_rcv(struct sk_buff *skb)
21{
22 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
23}
24
25static int udplite_err(struct sk_buff *skb, u32 info)
26{
27 return __udp4_lib_err(skb, info, &udplite_table);
28}
29
30static const struct net_protocol udplite_protocol = {
31 .handler = udplite_rcv,
32 .err_handler = udplite_err,
33 .no_policy = 1,
34 .netns_ok = 1,
35};
36
37struct proto udplite_prot = {
38 .name = "UDP-Lite",
39 .owner = THIS_MODULE,
40 .close = udp_lib_close,
41 .connect = ip4_datagram_connect,
42 .disconnect = udp_disconnect,
43 .ioctl = udp_ioctl,
44 .init = udplite_sk_init,
45 .destroy = udp_destroy_sock,
46 .setsockopt = udp_setsockopt,
47 .getsockopt = udp_getsockopt,
48 .sendmsg = udp_sendmsg,
49 .recvmsg = udp_recvmsg,
50 .sendpage = udp_sendpage,
51 .hash = udp_lib_hash,
52 .unhash = udp_lib_unhash,
53 .rehash = udp_v4_rehash,
54 .get_port = udp_v4_get_port,
55 .memory_allocated = &udp_memory_allocated,
56 .sysctl_mem = sysctl_udp_mem,
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};
64EXPORT_SYMBOL(udplite_prot);
65
66static 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
75static struct udp_seq_afinfo udplite4_seq_afinfo = {
76 .family = AF_INET,
77 .udp_table = &udplite_table,
78};
79
80static int __net_init udplite4_proc_init_net(struct net *net)
81{
82 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
83 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
84 return -ENOMEM;
85 return 0;
86}
87
88static void __net_exit udplite4_proc_exit_net(struct net *net)
89{
90 remove_proc_entry("udplite", net->proc_net);
91}
92
93static struct pernet_operations udplite4_net_ops = {
94 .init = udplite4_proc_init_net,
95 .exit = udplite4_proc_exit_net,
96};
97
98static __init int udplite4_proc_init(void)
99{
100 return register_pernet_subsys(&udplite4_net_ops);
101}
102#else
103static inline int udplite4_proc_init(void)
104{
105 return 0;
106}
107#endif
108
109void __init udplite4_register(void)
110{
111 udp_table_init(&udplite_table, "UDP-Lite");
112 if (proto_register(&udplite_prot, 1))
113 goto out_register_err;
114
115 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
116 goto out_unregister_proto;
117
118 inet_register_protosw(&udplite4_protosw);
119
120 if (udplite4_proc_init())
121 pr_err("%s: Cannot register /proc!\n", __func__);
122 return;
123
124out_unregister_proto:
125 proto_unregister(&udplite_prot);
126out_register_err:
127 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
128}