1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
4 *
5 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
6 *
7 * Changes:
8 * Fixes:
9 */
10
11 #define pr_fmt(fmt) "UDPLite: " fmt
12
13 #include <linux/export.h>
14 #include <linux/proc_fs.h>
15 #include "udp_impl.h"
16
17 struct udp_table udplite_table __read_mostly;
18 EXPORT_SYMBOL(udplite_table);
19
20 /* Designate sk as UDP-Lite socket */
udplite_sk_init(struct sock * sk)21 static int udplite_sk_init(struct sock *sk)
22 {
23 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
24 "please contact the netdev mailing list\n");
25 return udp_init_sock(sk);
26 }
27
udplite_rcv(struct sk_buff * skb)28 static int udplite_rcv(struct sk_buff *skb)
29 {
30 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
31 }
32
udplite_err(struct sk_buff * skb,u32 info)33 static int udplite_err(struct sk_buff *skb, u32 info)
34 {
35 return __udp4_lib_err(skb, info, &udplite_table);
36 }
37
38 static const struct net_protocol udplite_protocol = {
39 .handler = udplite_rcv,
40 .err_handler = udplite_err,
41 .no_policy = 1,
42 };
43
44 struct proto udplite_prot = {
45 .name = "UDP-Lite",
46 .owner = THIS_MODULE,
47 .close = udp_lib_close,
48 .connect = ip4_datagram_connect,
49 .disconnect = udp_disconnect,
50 .ioctl = udp_ioctl,
51 .init = udplite_sk_init,
52 .destroy = udp_destroy_sock,
53 .setsockopt = udp_setsockopt,
54 .getsockopt = udp_getsockopt,
55 .sendmsg = udp_sendmsg,
56 .recvmsg = udp_recvmsg,
57 .hash = udp_lib_hash,
58 .unhash = udp_lib_unhash,
59 .rehash = udp_v4_rehash,
60 .get_port = udp_v4_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 udp_sock),
69 .h.udp_table = &udplite_table,
70 };
71 EXPORT_SYMBOL(udplite_prot);
72
73 static struct inet_protosw udplite4_protosw = {
74 .type = SOCK_DGRAM,
75 .protocol = IPPROTO_UDPLITE,
76 .prot = &udplite_prot,
77 .ops = &inet_dgram_ops,
78 .flags = INET_PROTOSW_PERMANENT,
79 };
80
81 #ifdef CONFIG_PROC_FS
82 static struct udp_seq_afinfo udplite4_seq_afinfo = {
83 .family = AF_INET,
84 .udp_table = &udplite_table,
85 };
86
udplite4_proc_init_net(struct net * net)87 static int __net_init udplite4_proc_init_net(struct net *net)
88 {
89 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
90 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
91 return -ENOMEM;
92 return 0;
93 }
94
udplite4_proc_exit_net(struct net * net)95 static void __net_exit udplite4_proc_exit_net(struct net *net)
96 {
97 remove_proc_entry("udplite", net->proc_net);
98 }
99
100 static struct pernet_operations udplite4_net_ops = {
101 .init = udplite4_proc_init_net,
102 .exit = udplite4_proc_exit_net,
103 };
104
udplite4_proc_init(void)105 static __init int udplite4_proc_init(void)
106 {
107 return register_pernet_subsys(&udplite4_net_ops);
108 }
109 #else
udplite4_proc_init(void)110 static inline int udplite4_proc_init(void)
111 {
112 return 0;
113 }
114 #endif
115
udplite4_register(void)116 void __init udplite4_register(void)
117 {
118 udp_table_init(&udplite_table, "UDP-Lite");
119 if (proto_register(&udplite_prot, 1))
120 goto out_register_err;
121
122 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
123 goto out_unregister_proto;
124
125 inet_register_protosw(&udplite4_protosw);
126
127 if (udplite4_proc_init())
128 pr_err("%s: Cannot register /proc!\n", __func__);
129 return;
130
131 out_unregister_proto:
132 proto_unregister(&udplite_prot);
133 out_register_err:
134 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
135 }
136