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 .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
udplite4_proc_init_net(struct net * net)96 static int __net_init udplite4_proc_init_net(struct net *net)
97 {
98 return udp_proc_register(net, &udplite4_seq_afinfo);
99 }
100
udplite4_proc_exit_net(struct net * net)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
udplite4_proc_init(void)111 static __init int udplite4_proc_init(void)
112 {
113 return register_pernet_subsys(&udplite4_net_ops);
114 }
115 #else
udplite4_proc_init(void)116 static inline int udplite4_proc_init(void)
117 {
118 return 0;
119 }
120 #endif
121
udplite4_register(void)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 }
142