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
udplitev6_sk_init(struct sock * sk)17 static int udplitev6_sk_init(struct sock *sk)
18 {
19 udpv6_init_sock(sk);
20 udp_sk(sk)->pcflag = UDPLITE_BIT;
21 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
22 "please contact the netdev mailing list\n");
23 return 0;
24 }
25
udplitev6_rcv(struct sk_buff * skb)26 static int udplitev6_rcv(struct sk_buff *skb)
27 {
28 return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
29 }
30
udplitev6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)31 static int udplitev6_err(struct sk_buff *skb,
32 struct inet6_skb_parm *opt,
33 u8 type, u8 code, int offset, __be32 info)
34 {
35 return __udp6_lib_err(skb, opt, type, code, offset, info,
36 &udplite_table);
37 }
38
39 static const struct inet6_protocol udplitev6_protocol = {
40 .handler = udplitev6_rcv,
41 .err_handler = udplitev6_err,
42 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
43 };
44
45 struct proto udplitev6_prot = {
46 .name = "UDPLITEv6",
47 .owner = THIS_MODULE,
48 .close = udp_lib_close,
49 .connect = ip6_datagram_connect,
50 .disconnect = udp_disconnect,
51 .ioctl = udp_ioctl,
52 .init = udplitev6_sk_init,
53 .destroy = udpv6_destroy_sock,
54 .setsockopt = udpv6_setsockopt,
55 .getsockopt = udpv6_getsockopt,
56 .sendmsg = udpv6_sendmsg,
57 .recvmsg = udpv6_recvmsg,
58 .hash = udp_lib_hash,
59 .unhash = udp_lib_unhash,
60 .rehash = udp_v6_rehash,
61 .get_port = udp_v6_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 udp6_sock),
70 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
71 .h.udp_table = &udplite_table,
72 };
73
74 static struct inet_protosw udplite6_protosw = {
75 .type = SOCK_DGRAM,
76 .protocol = IPPROTO_UDPLITE,
77 .prot = &udplitev6_prot,
78 .ops = &inet6_dgram_ops,
79 .flags = INET_PROTOSW_PERMANENT,
80 };
81
udplitev6_init(void)82 int __init udplitev6_init(void)
83 {
84 int ret;
85
86 ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
87 if (ret)
88 goto out;
89
90 ret = inet6_register_protosw(&udplite6_protosw);
91 if (ret)
92 goto out_udplitev6_protocol;
93 out:
94 return ret;
95
96 out_udplitev6_protocol:
97 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
98 goto out;
99 }
100
udplitev6_exit(void)101 void udplitev6_exit(void)
102 {
103 inet6_unregister_protosw(&udplite6_protosw);
104 inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
105 }
106
107 #ifdef CONFIG_PROC_FS
108 static struct udp_seq_afinfo udplite6_seq_afinfo = {
109 .family = AF_INET6,
110 .udp_table = &udplite_table,
111 };
112
udplite6_proc_init_net(struct net * net)113 static int __net_init udplite6_proc_init_net(struct net *net)
114 {
115 if (!proc_create_net_data("udplite6", 0444, net->proc_net,
116 &udp6_seq_ops, sizeof(struct udp_iter_state),
117 &udplite6_seq_afinfo))
118 return -ENOMEM;
119 return 0;
120 }
121
udplite6_proc_exit_net(struct net * net)122 static void __net_exit udplite6_proc_exit_net(struct net *net)
123 {
124 remove_proc_entry("udplite6", net->proc_net);
125 }
126
127 static struct pernet_operations udplite6_net_ops = {
128 .init = udplite6_proc_init_net,
129 .exit = udplite6_proc_exit_net,
130 };
131
udplite6_proc_init(void)132 int __init udplite6_proc_init(void)
133 {
134 return register_pernet_subsys(&udplite6_net_ops);
135 }
136
udplite6_proc_exit(void)137 void udplite6_proc_exit(void)
138 {
139 unregister_pernet_subsys(&udplite6_net_ops);
140 }
141 #endif
142
