udplite.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  UDPLITEv6   An implementation of the UDP-Lite protocol over IPv6.
  4 *              See also net/ipv4/udplite.c
  5 *
  6 *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
  7 *
  8 *  Changes:
  9 *  Fixes:
 10 */
 11#define pr_fmt(fmt) "UDPLite6: " fmt
 12
 13#include <linux/export.h>
 14#include <linux/proc_fs.h>
 15#include "udp_impl.h"
 16
 17static int udplitev6_sk_init(struct sock *sk)
 18{
 19	pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
 20		     "please contact the netdev mailing list\n");
 21	return udpv6_init_sock(sk);
 22}
 23
 24static int udplitev6_rcv(struct sk_buff *skb)
 25{
 26	return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
 27}
 28
 29static int udplitev6_err(struct sk_buff *skb,
 30			  struct inet6_skb_parm *opt,
 31			  u8 type, u8 code, int offset, __be32 info)
 32{
 33	return __udp6_lib_err(skb, opt, type, code, offset, info,
 34			      &udplite_table);
 35}
 36
 37static const struct inet6_protocol udplitev6_protocol = {
 38	.handler	=	udplitev6_rcv,
 39	.err_handler	=	udplitev6_err,
 40	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 41};
 42
 43struct proto udplitev6_prot = {
 44	.name		   = "UDPLITEv6",
 45	.owner		   = THIS_MODULE,
 46	.close		   = udp_lib_close,
 47	.connect	   = ip6_datagram_connect,
 48	.disconnect	   = udp_disconnect,
 49	.ioctl		   = udp_ioctl,
 50	.init		   = udplitev6_sk_init,
 51	.destroy	   = udpv6_destroy_sock,
 52	.setsockopt	   = udpv6_setsockopt,
 53	.getsockopt	   = udpv6_getsockopt,
 54	.sendmsg	   = udpv6_sendmsg,
 55	.recvmsg	   = udpv6_recvmsg,
 56	.hash		   = udp_lib_hash,
 57	.unhash		   = udp_lib_unhash,
 58	.rehash		   = udp_v6_rehash,
 59	.get_port	   = udp_v6_get_port,
 60
 61	.memory_allocated  = &net_aligned_data.udp_memory_allocated,
 62	.per_cpu_fw_alloc  = &udp_memory_per_cpu_fw_alloc,
 63
 64	.sysctl_mem	   = sysctl_udp_mem,
 65	.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
 66	.sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
 67	.obj_size	   = sizeof(struct udp6_sock),
 68	.ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
 69	.h.udp_table	   = &udplite_table,
 70};
 71
 72static struct inet_protosw udplite6_protosw = {
 73	.type		= SOCK_DGRAM,
 74	.protocol	= IPPROTO_UDPLITE,
 75	.prot		= &udplitev6_prot,
 76	.ops		= &inet6_dgram_ops,
 77	.flags		= INET_PROTOSW_PERMANENT,
 78};
 79
 80int __init udplitev6_init(void)
 81{
 82	int ret;
 83
 84	ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
 85	if (ret)
 86		goto out;
 87
 88	ret = inet6_register_protosw(&udplite6_protosw);
 89	if (ret)
 90		goto out_udplitev6_protocol;
 91out:
 92	return ret;
 93
 94out_udplitev6_protocol:
 95	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
 96	goto out;
 97}
 98
 99void udplitev6_exit(void)
100{
101	inet6_unregister_protosw(&udplite6_protosw);
102	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
103}
104
105#ifdef CONFIG_PROC_FS
106static struct udp_seq_afinfo udplite6_seq_afinfo = {
107	.family		= AF_INET6,
108	.udp_table	= &udplite_table,
109};
110
111static int __net_init udplite6_proc_init_net(struct net *net)
112{
113	if (!proc_create_net_data("udplite6", 0444, net->proc_net,
114			&udp6_seq_ops, sizeof(struct udp_iter_state),
115			&udplite6_seq_afinfo))
116		return -ENOMEM;
117	return 0;
118}
119
120static void __net_exit udplite6_proc_exit_net(struct net *net)
121{
122	remove_proc_entry("udplite6", net->proc_net);
123}
124
125static struct pernet_operations udplite6_net_ops = {
126	.init = udplite6_proc_init_net,
127	.exit = udplite6_proc_exit_net,
128};
129
130int __init udplite6_proc_init(void)
131{
132	return register_pernet_subsys(&udplite6_net_ops);
133}
134
135void udplite6_proc_exit(void)
136{
137	unregister_pernet_subsys(&udplite6_net_ops);
138}
139#endif