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}

 
  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	.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};
 66EXPORT_SYMBOL(udplite_prot);
 67
 68static struct inet_protosw udplite4_protosw = {
 69	.type		=  SOCK_DGRAM,
 70	.protocol	=  IPPROTO_UDPLITE,
 71	.prot		=  &udplite_prot,
 72	.ops		=  &inet_dgram_ops,
 73	.no_check	=  0,		/* must checksum (RFC 3828) */
 74	.flags		=  INET_PROTOSW_PERMANENT,
 75};
 76
 77#ifdef CONFIG_PROC_FS
 78
 79static const struct file_operations udplite_afinfo_seq_fops = {
 80	.owner    = THIS_MODULE,
 81	.open     = udp_seq_open,
 82	.read     = seq_read,
 83	.llseek   = seq_lseek,
 84	.release  = seq_release_net
 85};
 86
 87static struct udp_seq_afinfo udplite4_seq_afinfo = {
 88	.name		= "udplite",
 89	.family		= AF_INET,
 90	.udp_table 	= &udplite_table,
 91	.seq_fops	= &udplite_afinfo_seq_fops,
 92	.seq_ops	= {
 93		.show		= udp4_seq_show,
 94	},
 95};
 96
 97static int __net_init udplite4_proc_init_net(struct net *net)
 98{
 99	return udp_proc_register(net, &udplite4_seq_afinfo);
 
 
 
100}
101
102static void __net_exit udplite4_proc_exit_net(struct net *net)
103{
104	udp_proc_unregister(net, &udplite4_seq_afinfo);
105}
106
107static struct pernet_operations udplite4_net_ops = {
108	.init = udplite4_proc_init_net,
109	.exit = udplite4_proc_exit_net,
110};
111
112static __init int udplite4_proc_init(void)
113{
114	return register_pernet_subsys(&udplite4_net_ops);
115}
116#else
117static inline int udplite4_proc_init(void)
118{
119	return 0;
120}
121#endif
122
123void __init udplite4_register(void)
124{
125	udp_table_init(&udplite_table, "UDP-Lite");
126	if (proto_register(&udplite_prot, 1))
127		goto out_register_err;
128
129	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
130		goto out_unregister_proto;
131
132	inet_register_protosw(&udplite4_protosw);
133
134	if (udplite4_proc_init())
135		pr_err("%s: Cannot register /proc!\n", __func__);
136	return;
137
138out_unregister_proto:
139	proto_unregister(&udplite_prot);
140out_register_err:
141	pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
142}