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
 19struct udp_table 	udplite_table __read_mostly;
 20EXPORT_SYMBOL(udplite_table);
 21
 
 
 
 
 
 
 
 
 
 22static int udplite_rcv(struct sk_buff *skb)
 23{
 24	return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
 25}
 26
 27static void udplite_err(struct sk_buff *skb, u32 info)
 28{
 29	__udp4_lib_err(skb, info, &udplite_table);
 30}
 31
 32static 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
 39struct 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	.hash		   = udp_lib_hash,
 54	.unhash		   = udp_lib_unhash,
 
 55	.get_port	   = udp_v4_get_port,
 
 56	.memory_allocated  = &udp_memory_allocated,
 
 
 57	.sysctl_mem	   = sysctl_udp_mem,
 
 
 58	.obj_size	   = sizeof(struct udp_sock),
 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};
 65EXPORT_SYMBOL(udplite_prot);
 66
 67static struct inet_protosw udplite4_protosw = {
 68	.type		=  SOCK_DGRAM,
 69	.protocol	=  IPPROTO_UDPLITE,
 70	.prot		=  &udplite_prot,
 71	.ops		=  &inet_dgram_ops,
 72	.flags		=  INET_PROTOSW_PERMANENT,
 73};
 74
 75#ifdef CONFIG_PROC_FS
 76
 77static const struct file_operations udplite_afinfo_seq_fops = {
 78	.open     = udp_seq_open,
 79	.read     = seq_read,
 80	.llseek   = seq_lseek,
 81	.release  = seq_release_net
 82};
 83
 84static struct udp_seq_afinfo udplite4_seq_afinfo = {
 85	.name		= "udplite",
 86	.family		= AF_INET,
 87	.udp_table 	= &udplite_table,
 88	.seq_fops	= &udplite_afinfo_seq_fops,
 89	.seq_ops	= {
 90		.show		= udp4_seq_show,
 91	},
 92};
 93
 94static int __net_init udplite4_proc_init_net(struct net *net)
 95{
 96	return udp_proc_register(net, &udplite4_seq_afinfo);
 
 
 
 97}
 98
 99static void __net_exit udplite4_proc_exit_net(struct net *net)
100{
101	udp_proc_unregister(net, &udplite4_seq_afinfo);
102}
103
104static struct pernet_operations udplite4_net_ops = {
105	.init = udplite4_proc_init_net,
106	.exit = udplite4_proc_exit_net,
107};
108
109static __init int udplite4_proc_init(void)
110{
111	return register_pernet_subsys(&udplite4_net_ops);
112}
113#else
114static inline int udplite4_proc_init(void)
115{
116	return 0;
117}
118#endif
119
120void __init udplite4_register(void)
121{
122	udp_table_init(&udplite_table, "UDP-Lite");
123	if (proto_register(&udplite_prot, 1))
124		goto out_register_err;
125
126	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
127		goto out_unregister_proto;
128
129	inet_register_protosw(&udplite4_protosw);
130
131	if (udplite4_proc_init())
132		pr_err("%s: Cannot register /proc!\n", __func__);
133	return;
134
135out_unregister_proto:
136	proto_unregister(&udplite_prot);
137out_register_err:
138	pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
139}

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
  4 *
  5 *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
  6 *
  7 *  Changes:
  8 *  Fixes:
 
 
 
 
  9 */
 10
 11#define pr_fmt(fmt) "UDPLite: " fmt
 12
 13#include <linux/export.h>
 14#include <linux/proc_fs.h>
 15#include "udp_impl.h"
 16
 17struct udp_table 	udplite_table __read_mostly;
 18EXPORT_SYMBOL(udplite_table);
 19
 20/* Designate sk as UDP-Lite socket */
 21static int udplite_sk_init(struct sock *sk)
 22{
 23	udp_init_sock(sk);
 24	pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
 25		     "please contact the netdev mailing list\n");
 26	return 0;
 27}
 28
 29static int udplite_rcv(struct sk_buff *skb)
 30{
 31	return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
 32}
 33
 34static int udplite_err(struct sk_buff *skb, u32 info)
 35{
 36	return __udp4_lib_err(skb, info, &udplite_table);
 37}
 38
 39static const struct net_protocol udplite_protocol = {
 40	.handler	= udplite_rcv,
 41	.err_handler	= udplite_err,
 42	.no_policy	= 1,
 
 43};
 44
 45struct proto 	udplite_prot = {
 46	.name		   = "UDP-Lite",
 47	.owner		   = THIS_MODULE,
 48	.close		   = udp_lib_close,
 49	.connect	   = ip4_datagram_connect,
 50	.disconnect	   = udp_disconnect,
 51	.ioctl		   = udp_ioctl,
 52	.init		   = udplite_sk_init,
 53	.destroy	   = udp_destroy_sock,
 54	.setsockopt	   = udp_setsockopt,
 55	.getsockopt	   = udp_getsockopt,
 56	.sendmsg	   = udp_sendmsg,
 57	.recvmsg	   = udp_recvmsg,
 
 58	.hash		   = udp_lib_hash,
 59	.unhash		   = udp_lib_unhash,
 60	.rehash		   = udp_v4_rehash,
 61	.get_port	   = udp_v4_get_port,
 62
 63	.memory_allocated  = &udp_memory_allocated,
 64	.per_cpu_fw_alloc  = &udp_memory_per_cpu_fw_alloc,
 65
 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,
 
 
 
 
 71};
 72EXPORT_SYMBOL(udplite_prot);
 73
 74static struct inet_protosw udplite4_protosw = {
 75	.type		=  SOCK_DGRAM,
 76	.protocol	=  IPPROTO_UDPLITE,
 77	.prot		=  &udplite_prot,
 78	.ops		=  &inet_dgram_ops,
 79	.flags		=  INET_PROTOSW_PERMANENT,
 80};
 81
 82#ifdef CONFIG_PROC_FS
 
 
 
 
 
 
 
 
 83static struct udp_seq_afinfo udplite4_seq_afinfo = {
 
 84	.family		= AF_INET,
 85	.udp_table 	= &udplite_table,
 
 
 
 
 86};
 87
 88static int __net_init udplite4_proc_init_net(struct net *net)
 89{
 90	if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
 91			sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
 92		return -ENOMEM;
 93	return 0;
 94}
 95
 96static void __net_exit udplite4_proc_exit_net(struct net *net)
 97{
 98	remove_proc_entry("udplite", net->proc_net);
 99}
100
101static struct pernet_operations udplite4_net_ops = {
102	.init = udplite4_proc_init_net,
103	.exit = udplite4_proc_exit_net,
104};
105
106static __init int udplite4_proc_init(void)
107{
108	return register_pernet_subsys(&udplite4_net_ops);
109}
110#else
111static inline int udplite4_proc_init(void)
112{
113	return 0;
114}
115#endif
116
117void __init udplite4_register(void)
118{
119	udp_table_init(&udplite_table, "UDP-Lite");
120	if (proto_register(&udplite_prot, 1))
121		goto out_register_err;
122
123	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
124		goto out_unregister_proto;
125
126	inet_register_protosw(&udplite4_protosw);
127
128	if (udplite4_proc_init())
129		pr_err("%s: Cannot register /proc!\n", __func__);
130	return;
131
132out_unregister_proto:
133	proto_unregister(&udplite_prot);
134out_register_err:
135	pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
136}