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#include "udp_impl.h"
 14
 15struct udp_table 	udplite_table __read_mostly;
 16EXPORT_SYMBOL(udplite_table);
 17
 
 
 
 
 
 
 
 
 
 18static int udplite_rcv(struct sk_buff *skb)
 19{
 20	return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
 21}
 22
 23static void udplite_err(struct sk_buff *skb, u32 info)
 24{
 25	__udp4_lib_err(skb, info, &udplite_table);
 26}
 27
 28static const struct net_protocol udplite_protocol = {
 29	.handler	= udplite_rcv,
 30	.err_handler	= udplite_err,
 31	.no_policy	= 1,
 32	.netns_ok	= 1,
 33};
 34
 35struct proto 	udplite_prot = {
 36	.name		   = "UDP-Lite",
 37	.owner		   = THIS_MODULE,
 38	.close		   = udp_lib_close,
 39	.connect	   = ip4_datagram_connect,
 40	.disconnect	   = udp_disconnect,
 41	.ioctl		   = udp_ioctl,
 42	.init		   = udplite_sk_init,
 43	.destroy	   = udp_destroy_sock,
 44	.setsockopt	   = udp_setsockopt,
 45	.getsockopt	   = udp_getsockopt,
 46	.sendmsg	   = udp_sendmsg,
 47	.recvmsg	   = udp_recvmsg,
 48	.sendpage	   = udp_sendpage,
 49	.backlog_rcv	   = udp_queue_rcv_skb,
 50	.hash		   = udp_lib_hash,
 51	.unhash		   = udp_lib_unhash,
 
 52	.get_port	   = udp_v4_get_port,
 
 
 
 
 
 
 
 53	.obj_size	   = sizeof(struct udp_sock),
 54	.slab_flags	   = SLAB_DESTROY_BY_RCU,
 55	.h.udp_table	   = &udplite_table,
 56#ifdef CONFIG_COMPAT
 57	.compat_setsockopt = compat_udp_setsockopt,
 58	.compat_getsockopt = compat_udp_getsockopt,
 59#endif
 60	.clear_sk	   = sk_prot_clear_portaddr_nulls,
 61};
 62EXPORT_SYMBOL(udplite_prot);
 63
 64static struct inet_protosw udplite4_protosw = {
 65	.type		=  SOCK_DGRAM,
 66	.protocol	=  IPPROTO_UDPLITE,
 67	.prot		=  &udplite_prot,
 68	.ops		=  &inet_dgram_ops,
 69	.no_check	=  0,		/* must checksum (RFC 3828) */
 70	.flags		=  INET_PROTOSW_PERMANENT,
 71};
 72
 73#ifdef CONFIG_PROC_FS
 74static struct udp_seq_afinfo udplite4_seq_afinfo = {
 75	.name		= "udplite",
 76	.family		= AF_INET,
 77	.udp_table 	= &udplite_table,
 78	.seq_fops	= {
 79		.owner	=	THIS_MODULE,
 80	},
 81	.seq_ops	= {
 82		.show		= udp4_seq_show,
 83	},
 84};
 85
 86static int __net_init udplite4_proc_init_net(struct net *net)
 87{
 88	return udp_proc_register(net, &udplite4_seq_afinfo);
 
 
 
 89}
 90
 91static void __net_exit udplite4_proc_exit_net(struct net *net)
 92{
 93	udp_proc_unregister(net, &udplite4_seq_afinfo);
 94}
 95
 96static struct pernet_operations udplite4_net_ops = {
 97	.init = udplite4_proc_init_net,
 98	.exit = udplite4_proc_exit_net,
 99};
100
101static __init int udplite4_proc_init(void)
102{
103	return register_pernet_subsys(&udplite4_net_ops);
104}
105#else
106static inline int udplite4_proc_init(void)
107{
108	return 0;
109}
110#endif
111
112void __init udplite4_register(void)
113{
114	udp_table_init(&udplite_table, "UDP-Lite");
115	if (proto_register(&udplite_prot, 1))
116		goto out_register_err;
117
118	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
119		goto out_unregister_proto;
120
121	inet_register_protosw(&udplite4_protosw);
122
123	if (udplite4_proc_init())
124		printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
125	return;
126
127out_unregister_proto:
128	proto_unregister(&udplite_prot);
129out_register_err:
130	printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
131}