1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
5 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
11 #define pr_fmt(fmt) "UDPLite: " fmt
13 #include <linux/export.h>
14 #include <linux/proc_fs.h>
17 struct udp_table udplite_table __read_mostly;
18 EXPORT_SYMBOL(udplite_table);
20 static int udplite_rcv(struct sk_buff *skb)
22 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25 static int udplite_err(struct sk_buff *skb, u32 info)
27 return __udp4_lib_err(skb, info, &udplite_table);
30 static const struct net_protocol udplite_protocol = {
31 .handler = udplite_rcv,
32 .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,
51 .unhash = udp_lib_unhash,
52 .rehash = udp_v4_rehash,
53 .get_port = udp_v4_get_port,
55 .memory_allocated = &udp_memory_allocated,
56 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc,
58 .sysctl_mem = sysctl_udp_mem,
59 .obj_size = sizeof(struct udp_sock),
60 .h.udp_table = &udplite_table,
62 EXPORT_SYMBOL(udplite_prot);
64 static struct inet_protosw udplite4_protosw = {
66 .protocol = IPPROTO_UDPLITE,
67 .prot = &udplite_prot,
68 .ops = &inet_dgram_ops,
69 .flags = INET_PROTOSW_PERMANENT,
73 static struct udp_seq_afinfo udplite4_seq_afinfo = {
75 .udp_table = &udplite_table,
78 static int __net_init udplite4_proc_init_net(struct net *net)
80 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
81 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
86 static void __net_exit udplite4_proc_exit_net(struct net *net)
88 remove_proc_entry("udplite", net->proc_net);
91 static struct pernet_operations udplite4_net_ops = {
92 .init = udplite4_proc_init_net,
93 .exit = udplite4_proc_exit_net,
96 static __init int udplite4_proc_init(void)
98 return register_pernet_subsys(&udplite4_net_ops);
101 static inline int udplite4_proc_init(void)
107 void __init udplite4_register(void)
109 udp_table_init(&udplite_table, "UDP-Lite");
110 if (proto_register(&udplite_prot, 1))
111 goto out_register_err;
113 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
114 goto out_unregister_proto;
116 inet_register_protosw(&udplite4_protosw);
118 if (udplite4_proc_init())
119 pr_err("%s: Cannot register /proc!\n", __func__);
122 out_unregister_proto:
123 proto_unregister(&udplite_prot);
125 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);