2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
4 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
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.
13 #include <linux/export.h>
16 struct udp_table udplite_table __read_mostly;
17 EXPORT_SYMBOL(udplite_table);
19 static int udplite_rcv(struct sk_buff *skb)
21 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
24 static void udplite_err(struct sk_buff *skb, u32 info)
26 __udp4_lib_err(skb, info, &udplite_table);
29 static const struct net_protocol udplite_protocol = {
30 .handler = udplite_rcv,
31 .err_handler = udplite_err,
36 struct proto udplite_prot = {
39 .close = udp_lib_close,
40 .connect = ip4_datagram_connect,
41 .disconnect = udp_disconnect,
43 .init = udplite_sk_init,
44 .destroy = udp_destroy_sock,
45 .setsockopt = udp_setsockopt,
46 .getsockopt = udp_getsockopt,
47 .sendmsg = udp_sendmsg,
48 .recvmsg = udp_recvmsg,
49 .sendpage = udp_sendpage,
50 .backlog_rcv = udp_queue_rcv_skb,
52 .unhash = udp_lib_unhash,
53 .get_port = udp_v4_get_port,
54 .obj_size = sizeof(struct udp_sock),
55 .slab_flags = SLAB_DESTROY_BY_RCU,
56 .h.udp_table = &udplite_table,
58 .compat_setsockopt = compat_udp_setsockopt,
59 .compat_getsockopt = compat_udp_getsockopt,
61 .clear_sk = sk_prot_clear_portaddr_nulls,
63 EXPORT_SYMBOL(udplite_prot);
65 static struct inet_protosw udplite4_protosw = {
67 .protocol = IPPROTO_UDPLITE,
68 .prot = &udplite_prot,
69 .ops = &inet_dgram_ops,
70 .no_check = 0, /* must checksum (RFC 3828) */
71 .flags = INET_PROTOSW_PERMANENT,
76 static const struct file_operations udplite_afinfo_seq_fops = {
81 .release = seq_release_net
84 static struct udp_seq_afinfo udplite4_seq_afinfo = {
87 .udp_table = &udplite_table,
88 .seq_fops = &udplite_afinfo_seq_fops,
90 .show = udp4_seq_show,
94 static int __net_init udplite4_proc_init_net(struct net *net)
96 return udp_proc_register(net, &udplite4_seq_afinfo);
99 static void __net_exit udplite4_proc_exit_net(struct net *net)
101 udp_proc_unregister(net, &udplite4_seq_afinfo);
104 static struct pernet_operations udplite4_net_ops = {
105 .init = udplite4_proc_init_net,
106 .exit = udplite4_proc_exit_net,
109 static __init int udplite4_proc_init(void)
111 return register_pernet_subsys(&udplite4_net_ops);
114 static inline int udplite4_proc_init(void)
120 void __init udplite4_register(void)
122 udp_table_init(&udplite_table, "UDP-Lite");
123 if (proto_register(&udplite_prot, 1))
124 goto out_register_err;
126 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
127 goto out_unregister_proto;
129 inet_register_protosw(&udplite4_protosw);
131 if (udplite4_proc_init())
132 pr_err("%s: Cannot register /proc!\n", __func__);
135 out_unregister_proto:
136 proto_unregister(&udplite_prot);
138 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);