xref: /kernel/linux/linux-5.10/net/ipv6/udplite.c (revision 8c2ecf20) 
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#include <linux/export.h>
12#include <linux/proc_fs.h>
13#include "udp_impl.h"
14
15static int udplitev6_sk_init(struct sock *sk)
16{
17	udpv6_init_sock(sk);
18	udp_sk(sk)->pcflag = UDPLITE_BIT;
19	return 0;
20}
21
22static int udplitev6_rcv(struct sk_buff *skb)
23{
24	return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
25}
26
27static int udplitev6_err(struct sk_buff *skb,
28			  struct inet6_skb_parm *opt,
29			  u8 type, u8 code, int offset, __be32 info)
30{
31	return __udp6_lib_err(skb, opt, type, code, offset, info,
32			      &udplite_table);
33}
34
35static const struct inet6_protocol udplitev6_protocol = {
36	.handler	=	udplitev6_rcv,
37	.err_handler	=	udplitev6_err,
38	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
39};
40
41struct proto udplitev6_prot = {
42	.name		   = "UDPLITEv6",
43	.owner		   = THIS_MODULE,
44	.close		   = udp_lib_close,
45	.connect	   = ip6_datagram_connect,
46	.disconnect	   = udp_disconnect,
47	.ioctl		   = udp_ioctl,
48	.init		   = udplitev6_sk_init,
49	.destroy	   = udpv6_destroy_sock,
50	.setsockopt	   = udpv6_setsockopt,
51	.getsockopt	   = udpv6_getsockopt,
52	.sendmsg	   = udpv6_sendmsg,
53	.recvmsg	   = udpv6_recvmsg,
54	.hash		   = udp_lib_hash,
55	.unhash		   = udp_lib_unhash,
56	.rehash		   = udp_v6_rehash,
57	.get_port	   = udp_v6_get_port,
58	.memory_allocated  = &udp_memory_allocated,
59	.sysctl_mem	   = sysctl_udp_mem,
60	.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
61	.sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
62	.obj_size	   = sizeof(struct udp6_sock),
63	.h.udp_table	   = &udplite_table,
64};
65
66static struct inet_protosw udplite6_protosw = {
67	.type		= SOCK_DGRAM,
68	.protocol	= IPPROTO_UDPLITE,
69	.prot		= &udplitev6_prot,
70	.ops		= &inet6_dgram_ops,
71	.flags		= INET_PROTOSW_PERMANENT,
72};
73
74int __init udplitev6_init(void)
75{
76	int ret;
77
78	ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
79	if (ret)
80		goto out;
81
82	ret = inet6_register_protosw(&udplite6_protosw);
83	if (ret)
84		goto out_udplitev6_protocol;
85out:
86	return ret;
87
88out_udplitev6_protocol:
89	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
90	goto out;
91}
92
93void udplitev6_exit(void)
94{
95	inet6_unregister_protosw(&udplite6_protosw);
96	inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
97}
98
99#ifdef CONFIG_PROC_FS
100static struct udp_seq_afinfo udplite6_seq_afinfo = {
101	.family		= AF_INET6,
102	.udp_table	= &udplite_table,
103};
104
105static int __net_init udplite6_proc_init_net(struct net *net)
106{
107	if (!proc_create_net_data("udplite6", 0444, net->proc_net,
108			&udp6_seq_ops, sizeof(struct udp_iter_state),
109			&udplite6_seq_afinfo))
110		return -ENOMEM;
111	return 0;
112}
113
114static void __net_exit udplite6_proc_exit_net(struct net *net)
115{
116	remove_proc_entry("udplite6", net->proc_net);
117}
118
119static struct pernet_operations udplite6_net_ops = {
120	.init = udplite6_proc_init_net,
121	.exit = udplite6_proc_exit_net,
122};
123
124int __init udplite6_proc_init(void)
125{
126	return register_pernet_subsys(&udplite6_net_ops);
127}
128
129void udplite6_proc_exit(void)
130{
131	unregister_pernet_subsys(&udplite6_net_ops);
132}
133#endif
134