1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828).
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Changes:
8*4882a593Smuzhiyun * Fixes:
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #define pr_fmt(fmt) "UDPLite: " fmt
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/export.h>
14*4882a593Smuzhiyun #include <linux/proc_fs.h>
15*4882a593Smuzhiyun #include "udp_impl.h"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct udp_table udplite_table __read_mostly;
18*4882a593Smuzhiyun EXPORT_SYMBOL(udplite_table);
19*4882a593Smuzhiyun
udplite_rcv(struct sk_buff * skb)20*4882a593Smuzhiyun static int udplite_rcv(struct sk_buff *skb)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
udplite_err(struct sk_buff * skb,u32 info)25*4882a593Smuzhiyun static int udplite_err(struct sk_buff *skb, u32 info)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun return __udp4_lib_err(skb, info, &udplite_table);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct net_protocol udplite_protocol = {
31*4882a593Smuzhiyun .handler = udplite_rcv,
32*4882a593Smuzhiyun .err_handler = udplite_err,
33*4882a593Smuzhiyun .no_policy = 1,
34*4882a593Smuzhiyun .netns_ok = 1,
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun struct proto udplite_prot = {
38*4882a593Smuzhiyun .name = "UDP-Lite",
39*4882a593Smuzhiyun .owner = THIS_MODULE,
40*4882a593Smuzhiyun .close = udp_lib_close,
41*4882a593Smuzhiyun .connect = ip4_datagram_connect,
42*4882a593Smuzhiyun .disconnect = udp_disconnect,
43*4882a593Smuzhiyun .ioctl = udp_ioctl,
44*4882a593Smuzhiyun .init = udplite_sk_init,
45*4882a593Smuzhiyun .destroy = udp_destroy_sock,
46*4882a593Smuzhiyun .setsockopt = udp_setsockopt,
47*4882a593Smuzhiyun .getsockopt = udp_getsockopt,
48*4882a593Smuzhiyun .sendmsg = udp_sendmsg,
49*4882a593Smuzhiyun .recvmsg = udp_recvmsg,
50*4882a593Smuzhiyun .sendpage = udp_sendpage,
51*4882a593Smuzhiyun .hash = udp_lib_hash,
52*4882a593Smuzhiyun .unhash = udp_lib_unhash,
53*4882a593Smuzhiyun .rehash = udp_v4_rehash,
54*4882a593Smuzhiyun .get_port = udp_v4_get_port,
55*4882a593Smuzhiyun .memory_allocated = &udp_memory_allocated,
56*4882a593Smuzhiyun .sysctl_mem = sysctl_udp_mem,
57*4882a593Smuzhiyun .obj_size = sizeof(struct udp_sock),
58*4882a593Smuzhiyun .h.udp_table = &udplite_table,
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun EXPORT_SYMBOL(udplite_prot);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun static struct inet_protosw udplite4_protosw = {
63*4882a593Smuzhiyun .type = SOCK_DGRAM,
64*4882a593Smuzhiyun .protocol = IPPROTO_UDPLITE,
65*4882a593Smuzhiyun .prot = &udplite_prot,
66*4882a593Smuzhiyun .ops = &inet_dgram_ops,
67*4882a593Smuzhiyun .flags = INET_PROTOSW_PERMANENT,
68*4882a593Smuzhiyun };
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun #ifdef CONFIG_PROC_FS
71*4882a593Smuzhiyun static struct udp_seq_afinfo udplite4_seq_afinfo = {
72*4882a593Smuzhiyun .family = AF_INET,
73*4882a593Smuzhiyun .udp_table = &udplite_table,
74*4882a593Smuzhiyun };
75*4882a593Smuzhiyun
udplite4_proc_init_net(struct net * net)76*4882a593Smuzhiyun static int __net_init udplite4_proc_init_net(struct net *net)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
79*4882a593Smuzhiyun sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
80*4882a593Smuzhiyun return -ENOMEM;
81*4882a593Smuzhiyun return 0;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
udplite4_proc_exit_net(struct net * net)84*4882a593Smuzhiyun static void __net_exit udplite4_proc_exit_net(struct net *net)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun remove_proc_entry("udplite", net->proc_net);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static struct pernet_operations udplite4_net_ops = {
90*4882a593Smuzhiyun .init = udplite4_proc_init_net,
91*4882a593Smuzhiyun .exit = udplite4_proc_exit_net,
92*4882a593Smuzhiyun };
93*4882a593Smuzhiyun
udplite4_proc_init(void)94*4882a593Smuzhiyun static __init int udplite4_proc_init(void)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun return register_pernet_subsys(&udplite4_net_ops);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun #else
udplite4_proc_init(void)99*4882a593Smuzhiyun static inline int udplite4_proc_init(void)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun return 0;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun #endif
104*4882a593Smuzhiyun
udplite4_register(void)105*4882a593Smuzhiyun void __init udplite4_register(void)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun udp_table_init(&udplite_table, "UDP-Lite");
108*4882a593Smuzhiyun if (proto_register(&udplite_prot, 1))
109*4882a593Smuzhiyun goto out_register_err;
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
112*4882a593Smuzhiyun goto out_unregister_proto;
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun inet_register_protosw(&udplite4_protosw);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun if (udplite4_proc_init())
117*4882a593Smuzhiyun pr_err("%s: Cannot register /proc!\n", __func__);
118*4882a593Smuzhiyun return;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun out_unregister_proto:
121*4882a593Smuzhiyun proto_unregister(&udplite_prot);
122*4882a593Smuzhiyun out_register_err:
123*4882a593Smuzhiyun pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
124*4882a593Smuzhiyun }
125