xref: /openbmc/linux/net/ipv4/udplite.c (revision 615c36f5)
1 /*
2  *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
3  *
4  *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
5  *
6  *  Changes:
7  *  Fixes:
8  *		This program is free software; you can redistribute it and/or
9  *		modify it under the terms of the GNU General Public License
10  *		as published by the Free Software Foundation; either version
11  *		2 of the License, or (at your option) any later version.
12  */
13 #include <linux/export.h>
14 #include "udp_impl.h"
15 
16 struct udp_table 	udplite_table __read_mostly;
17 EXPORT_SYMBOL(udplite_table);
18 
19 static int udplite_rcv(struct sk_buff *skb)
20 {
21 	return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
22 }
23 
24 static void udplite_err(struct sk_buff *skb, u32 info)
25 {
26 	__udp4_lib_err(skb, info, &udplite_table);
27 }
28 
29 static const struct net_protocol udplite_protocol = {
30 	.handler	= udplite_rcv,
31 	.err_handler	= udplite_err,
32 	.no_policy	= 1,
33 	.netns_ok	= 1,
34 };
35 
36 struct proto 	udplite_prot = {
37 	.name		   = "UDP-Lite",
38 	.owner		   = THIS_MODULE,
39 	.close		   = udp_lib_close,
40 	.connect	   = ip4_datagram_connect,
41 	.disconnect	   = udp_disconnect,
42 	.ioctl		   = udp_ioctl,
43 	.init		   = udplite_sk_init,
44 	.destroy	   = udp_destroy_sock,
45 	.setsockopt	   = udp_setsockopt,
46 	.getsockopt	   = udp_getsockopt,
47 	.sendmsg	   = udp_sendmsg,
48 	.recvmsg	   = udp_recvmsg,
49 	.sendpage	   = udp_sendpage,
50 	.backlog_rcv	   = udp_queue_rcv_skb,
51 	.hash		   = udp_lib_hash,
52 	.unhash		   = udp_lib_unhash,
53 	.get_port	   = udp_v4_get_port,
54 	.obj_size	   = sizeof(struct udp_sock),
55 	.slab_flags	   = SLAB_DESTROY_BY_RCU,
56 	.h.udp_table	   = &udplite_table,
57 #ifdef CONFIG_COMPAT
58 	.compat_setsockopt = compat_udp_setsockopt,
59 	.compat_getsockopt = compat_udp_getsockopt,
60 #endif
61 	.clear_sk	   = sk_prot_clear_portaddr_nulls,
62 };
63 EXPORT_SYMBOL(udplite_prot);
64 
65 static struct inet_protosw udplite4_protosw = {
66 	.type		=  SOCK_DGRAM,
67 	.protocol	=  IPPROTO_UDPLITE,
68 	.prot		=  &udplite_prot,
69 	.ops		=  &inet_dgram_ops,
70 	.no_check	=  0,		/* must checksum (RFC 3828) */
71 	.flags		=  INET_PROTOSW_PERMANENT,
72 };
73 
74 #ifdef CONFIG_PROC_FS
75 
76 static const struct file_operations udplite_afinfo_seq_fops = {
77 	.owner    = THIS_MODULE,
78 	.open     = udp_seq_open,
79 	.read     = seq_read,
80 	.llseek   = seq_lseek,
81 	.release  = seq_release_net
82 };
83 
84 static struct udp_seq_afinfo udplite4_seq_afinfo = {
85 	.name		= "udplite",
86 	.family		= AF_INET,
87 	.udp_table 	= &udplite_table,
88 	.seq_fops	= &udplite_afinfo_seq_fops,
89 	.seq_ops	= {
90 		.show		= udp4_seq_show,
91 	},
92 };
93 
94 static int __net_init udplite4_proc_init_net(struct net *net)
95 {
96 	return udp_proc_register(net, &udplite4_seq_afinfo);
97 }
98 
99 static void __net_exit udplite4_proc_exit_net(struct net *net)
100 {
101 	udp_proc_unregister(net, &udplite4_seq_afinfo);
102 }
103 
104 static struct pernet_operations udplite4_net_ops = {
105 	.init = udplite4_proc_init_net,
106 	.exit = udplite4_proc_exit_net,
107 };
108 
109 static __init int udplite4_proc_init(void)
110 {
111 	return register_pernet_subsys(&udplite4_net_ops);
112 }
113 #else
114 static inline int udplite4_proc_init(void)
115 {
116 	return 0;
117 }
118 #endif
119 
120 void __init udplite4_register(void)
121 {
122 	udp_table_init(&udplite_table, "UDP-Lite");
123 	if (proto_register(&udplite_prot, 1))
124 		goto out_register_err;
125 
126 	if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
127 		goto out_unregister_proto;
128 
129 	inet_register_protosw(&udplite4_protosw);
130 
131 	if (udplite4_proc_init())
132 		printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
133 	return;
134 
135 out_unregister_proto:
136 	proto_unregister(&udplite_prot);
137 out_register_err:
138 	printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
139 }
140