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
udplite_rcv(struct sk_buff * skb)20 static int udplite_rcv(struct sk_buff *skb)
21 {
22 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
23 }
24
udplite_err(struct sk_buff * skb,u32 info)25 static int udplite_err(struct sk_buff *skb, u32 info)
26 {
27 return __udp4_lib_err(skb, info, &udplite_table);
28 }
29
30 static const struct net_protocol udplite_protocol = {
31 .handler = udplite_rcv,
32 .err_handler = udplite_err,
33 .no_policy = 1,
34 .netns_ok = 1,
35 };
36
37 struct proto udplite_prot = {
38 .name = "UDP-Lite",
39 .owner = THIS_MODULE,
40 .close = udp_lib_close,
41 .connect = ip4_datagram_connect,
42 .disconnect = udp_disconnect,
43 .ioctl = udp_ioctl,
44 .init = udplite_sk_init,
45 .destroy = udp_destroy_sock,
46 .setsockopt = udp_setsockopt,
47 .getsockopt = udp_getsockopt,
48 .sendmsg = udp_sendmsg,
49 .recvmsg = udp_recvmsg,
50 .sendpage = udp_sendpage,
51 .hash = udp_lib_hash,
52 .unhash = udp_lib_unhash,
53 .rehash = udp_v4_rehash,
54 .get_port = udp_v4_get_port,
55 .memory_allocated = &udp_memory_allocated,
56 .sysctl_mem = sysctl_udp_mem,
57 .obj_size = sizeof(struct udp_sock),
58 .h.udp_table = &udplite_table,
59 };
60 EXPORT_SYMBOL(udplite_prot);
61
62 static struct inet_protosw udplite4_protosw = {
63 .type = SOCK_DGRAM,
64 .protocol = IPPROTO_UDPLITE,
65 .prot = &udplite_prot,
66 .ops = &inet_dgram_ops,
67 .flags = INET_PROTOSW_PERMANENT,
68 };
69
70 #ifdef CONFIG_PROC_FS
71 static struct udp_seq_afinfo udplite4_seq_afinfo = {
72 .family = AF_INET,
73 .udp_table = &udplite_table,
74 };
75
udplite4_proc_init_net(struct net * net)76 static int __net_init udplite4_proc_init_net(struct net *net)
77 {
78 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
79 sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
80 return -ENOMEM;
81 return 0;
82 }
83
udplite4_proc_exit_net(struct net * net)84 static void __net_exit udplite4_proc_exit_net(struct net *net)
85 {
86 remove_proc_entry("udplite", net->proc_net);
87 }
88
89 static struct pernet_operations udplite4_net_ops = {
90 .init = udplite4_proc_init_net,
91 .exit = udplite4_proc_exit_net,
92 };
93
udplite4_proc_init(void)94 static __init int udplite4_proc_init(void)
95 {
96 return register_pernet_subsys(&udplite4_net_ops);
97 }
98 #else
udplite4_proc_init(void)99 static inline int udplite4_proc_init(void)
100 {
101 return 0;
102 }
103 #endif
104
udplite4_register(void)105 void __init udplite4_register(void)
106 {
107 udp_table_init(&udplite_table, "UDP-Lite");
108 if (proto_register(&udplite_prot, 1))
109 goto out_register_err;
110
111 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
112 goto out_unregister_proto;
113
114 inet_register_protosw(&udplite4_protosw);
115
116 if (udplite4_proc_init())
117 pr_err("%s: Cannot register /proc!\n", __func__);
118 return;
119
120 out_unregister_proto:
121 proto_unregister(&udplite_prot);
122 out_register_err:
123 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
124 }
125