xref: /kernel/linux/linux-6.6/net/ipv6/udplite.c (revision 62306a36) 
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	udpv6_init_sock(sk);
20	pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
21		     "please contact the netdev mailing list\n");
22	return 0;
23}
24
25static int udplitev6_rcv(struct sk_buff *skb)
26{
27	return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
28}
29
30static int udplitev6_err(struct sk_buff *skb,
31			  struct inet6_skb_parm *opt,
32			  u8 type, u8 code, int offset, __be32 info)
33{
34	return __udp6_lib_err(skb, opt, type, code, offset, info,
35			      &udplite_table);
36}
37
38static const struct inet6_protocol udplitev6_protocol = {
39	.handler	=	udplitev6_rcv,
40	.err_handler	=	udplitev6_err,
41	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
42};
43
44struct proto udplitev6_prot = {
45	.name		   = "UDPLITEv6",
46	.owner		   = THIS_MODULE,
47	.close		   = udp_lib_close,
48	.connect	   = ip6_datagram_connect,
49	.disconnect	   = udp_disconnect,
50	.ioctl		   = udp_ioctl,
51	.init		   = udplitev6_sk_init,
52	.destroy	   = udpv6_destroy_sock,
53	.setsockopt	   = udpv6_setsockopt,
54	.getsockopt	   = udpv6_getsockopt,
55	.sendmsg	   = udpv6_sendmsg,
56	.recvmsg	   = udpv6_recvmsg,
57	.hash		   = udp_lib_hash,
58	.unhash		   = udp_lib_unhash,
59	.rehash		   = udp_v6_rehash,
60	.get_port	   = udp_v6_get_port,
61
62	.memory_allocated  = &udp_memory_allocated,
63	.per_cpu_fw_alloc  = &udp_memory_per_cpu_fw_alloc,
64
65	.sysctl_mem	   = sysctl_udp_mem,
66	.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
67	.sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
68	.obj_size	   = sizeof(struct udp6_sock),
69	.ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
70	.h.udp_table	   = &udplite_table,
71};
72
73static struct inet_protosw udplite6_protosw = {
74	.type		= SOCK_DGRAM,
75	.protocol	= IPPROTO_UDPLITE,
76	.prot		= &udplitev6_prot,
77	.ops		= &inet6_dgram_ops,
78	.flags		= INET_PROTOSW_PERMANENT,
79};
80
81int __init udplitev6_init(void)
82{
83	int ret;
84
85	ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
86	if (ret)
87		goto out;
88
89	ret = inet6_register_protosw(&udplite6_protosw);
90	if (ret)
91		goto out_udplitev6_protocol;
92out:
93	return ret;
94
95out_udplitev6_protocol:
96	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
97	goto out;
98}
99
100void udplitev6_exit(void)
101{
102	inet6_unregister_protosw(&udplite6_protosw);
103	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
104}
105
106#ifdef CONFIG_PROC_FS
107static struct udp_seq_afinfo udplite6_seq_afinfo = {
108	.family		= AF_INET6,
109	.udp_table	= &udplite_table,
110};
111
112static int __net_init udplite6_proc_init_net(struct net *net)
113{
114	if (!proc_create_net_data("udplite6", 0444, net->proc_net,
115			&udp6_seq_ops, sizeof(struct udp_iter_state),
116			&udplite6_seq_afinfo))
117		return -ENOMEM;
118	return 0;
119}
120
121static void __net_exit udplite6_proc_exit_net(struct net *net)
122{
123	remove_proc_entry("udplite6", net->proc_net);
124}
125
126static struct pernet_operations udplite6_net_ops = {
127	.init = udplite6_proc_init_net,
128	.exit = udplite6_proc_exit_net,
129};
130
131int __init udplite6_proc_init(void)
132{
133	return register_pernet_subsys(&udplite6_net_ops);
134}
135
136void udplite6_proc_exit(void)
137{
138	unregister_pernet_subsys(&udplite6_net_ops);
139}
140#endif
141