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
udplite_rcv(struct sk_buff * skb)22 static int udplite_rcv(struct sk_buff *skb)
23 {
24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25 }
26
udplite_err(struct sk_buff * skb,u32 info)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 .no_check = 0, /* must checksum (RFC 3828) */
74 .flags = INET_PROTOSW_PERMANENT,
75 };
76
77 #ifdef CONFIG_PROC_FS
78
79 static const struct file_operations udplite_afinfo_seq_fops = {
80 .owner = THIS_MODULE,
81 .open = udp_seq_open,
82 .read = seq_read,
83 .llseek = seq_lseek,
84 .release = seq_release_net
85 };
86
87 static struct udp_seq_afinfo udplite4_seq_afinfo = {
88 .name = "udplite",
89 .family = AF_INET,
90 .udp_table = &udplite_table,
91 .seq_fops = &udplite_afinfo_seq_fops,
92 .seq_ops = {
93 .show = udp4_seq_show,
94 },
95 };
96
udplite4_proc_init_net(struct net * net)97 static int __net_init udplite4_proc_init_net(struct net *net)
98 {
99 return udp_proc_register(net, &udplite4_seq_afinfo);
100 }
101
udplite4_proc_exit_net(struct net * net)102 static void __net_exit udplite4_proc_exit_net(struct net *net)
103 {
104 udp_proc_unregister(net, &udplite4_seq_afinfo);
105 }
106
107 static struct pernet_operations udplite4_net_ops = {
108 .init = udplite4_proc_init_net,
109 .exit = udplite4_proc_exit_net,
110 };
111
udplite4_proc_init(void)112 static __init int udplite4_proc_init(void)
113 {
114 return register_pernet_subsys(&udplite4_net_ops);
115 }
116 #else
udplite4_proc_init(void)117 static inline int udplite4_proc_init(void)
118 {
119 return 0;
120 }
121 #endif
122
udplite4_register(void)123 void __init udplite4_register(void)
124 {
125 udp_table_init(&udplite_table, "UDP-Lite");
126 if (proto_register(&udplite_prot, 1))
127 goto out_register_err;
128
129 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
130 goto out_unregister_proto;
131
132 inet_register_protosw(&udplite4_protosw);
133
134 if (udplite4_proc_init())
135 pr_err("%s: Cannot register /proc!\n", __func__);
136 return;
137
138 out_unregister_proto:
139 proto_unregister(&udplite_prot);
140 out_register_err:
141 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
142 }
143