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.
14 #define pr_fmt(fmt) "UDPLite: " fmt
16 #include <linux/export.h>
17 #include <linux/proc_fs.h>
20 struct udp_table udplite_table __read_mostly;
21 EXPORT_SYMBOL(udplite_table);
23 /* Designate sk as UDP-Lite socket */
24 static int udplite_sk_init(struct sock *sk)
27 udp_sk(sk)->pcflag = UDPLITE_BIT;
31 static int udplite_rcv(struct sk_buff *skb)
33 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
36 static void udplite_err(struct sk_buff *skb, u32 info)
38 __udp4_lib_err(skb, info, &udplite_table);
41 static const struct net_protocol udplite_protocol = {
42 .handler = udplite_rcv,
43 .err_handler = udplite_err,
48 struct proto udplite_prot = {
51 .close = udp_lib_close,
52 .connect = ip4_datagram_connect,
53 .disconnect = udp_disconnect,
55 .init = udplite_sk_init,
56 .destroy = udp_destroy_sock,
57 .setsockopt = udp_setsockopt,
58 .getsockopt = udp_getsockopt,
59 .sendmsg = udp_sendmsg,
60 .recvmsg = udp_recvmsg,
61 .sendpage = udp_sendpage,
63 .unhash = udp_lib_unhash,
64 .get_port = udp_v4_get_port,
65 .memory_allocated = &udp_memory_allocated,
66 .sysctl_mem = sysctl_udp_mem,
67 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
68 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
69 .obj_size = sizeof(struct udp_sock),
70 .h.udp_table = &udplite_table,
72 .compat_setsockopt = compat_udp_setsockopt,
73 .compat_getsockopt = compat_udp_getsockopt,
76 EXPORT_SYMBOL(udplite_prot);
78 static struct inet_protosw udplite4_protosw = {
80 .protocol = IPPROTO_UDPLITE,
81 .prot = &udplite_prot,
82 .ops = &inet_dgram_ops,
83 .flags = INET_PROTOSW_PERMANENT,
87 static struct udp_seq_afinfo udplite4_seq_afinfo = {
89 .udp_table = &udplite_table,
92 static int __net_init udplite4_proc_init_net(struct net *net)
94 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
95 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
100 static void __net_exit udplite4_proc_exit_net(struct net *net)
102 remove_proc_entry("udplite", net->proc_net);
105 static struct pernet_operations udplite4_net_ops = {
106 .init = udplite4_proc_init_net,
107 .exit = udplite4_proc_exit_net,
110 static __init int udplite4_proc_init(void)
112 return register_pernet_subsys(&udplite4_net_ops);
115 static inline int udplite4_proc_init(void)
121 void __init udplite4_register(void)
123 udp_table_init(&udplite_table, "UDP-Lite");
124 if (proto_register(&udplite_prot, 1))
125 goto out_register_err;
127 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
128 goto out_unregister_proto;
130 inet_register_protosw(&udplite4_protosw);
132 if (udplite4_proc_init())
133 pr_err("%s: Cannot register /proc!\n", __func__);
136 out_unregister_proto:
137 proto_unregister(&udplite_prot);
139 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);