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 = &net_aligned_data.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(prot: &udplitev6_protocol, IPPROTO_UDPLITE);
86 if (ret)
87 goto out;
88
89 ret = inet6_register_protosw(p: &udplite6_protosw);
90 if (ret)
91 goto out_udplitev6_protocol;
92out:
93 return ret;
94
95out_udplitev6_protocol:
96 inet6_del_protocol(prot: &udplitev6_protocol, IPPROTO_UDPLITE);
97 goto out;
98}
99
100void udplitev6_exit(void)
101{
102 inet6_unregister_protosw(p: &udplite6_protosw);
103 inet6_del_protocol(prot: &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(name: "udplite6", mode: 0444, parent: net->proc_net,
115 ops: &udp6_seq_ops, state_size: sizeof(struct udp_iter_state),
116 data: &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