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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/** -*- linux-c -*- ***********************************************************
2 * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
3 *
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoE --- PPP over Ethernet (RFC 2516)
6 *
7 *
8 * Version: 0.5.2
9 *
10 * Author: Michal Ostrowski <mostrows@speakeasy.net>
11 *
12 * 051000 : Initialization cleanup
13 *
14 * License:
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 *
20 */
21
22#include <linux/string.h>
23#include <linux/module.h>
24#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/errno.h>
26#include <linux/netdevice.h>
27#include <linux/net.h>
28#include <linux/init.h>
29#include <linux/if_pppox.h>
30#include <linux/ppp_defs.h>
Paul Mackerras4b32da2b2012-03-04 12:56:55 +000031#include <linux/ppp-ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/ppp_channel.h>
James Chapman65def812007-04-30 00:21:02 -070033#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#include <net/sock.h>
36
37#include <asm/uaccess.h>
38
Eric Dumazet756e64a2010-09-21 06:43:54 +000039static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Eric Dumazet756e64a2010-09-21 06:43:54 +000041int register_pppox_proto(int proto_num, const struct pppox_proto *pp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 if (proto_num < 0 || proto_num > PX_MAX_PROTO)
44 return -EINVAL;
45 if (pppox_protos[proto_num])
46 return -EALREADY;
47 pppox_protos[proto_num] = pp;
48 return 0;
49}
50
51void unregister_pppox_proto(int proto_num)
52{
53 if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
54 pppox_protos[proto_num] = NULL;
55}
56
57void pppox_unbind_sock(struct sock *sk)
58{
59 /* Clear connection to ppp device, if attached. */
60
Guillaume Naulta8acce62015-11-19 12:53:21 +010061 if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 ppp_unregister_channel(&pppox_sk(sk)->chan);
63 sk->sk_state = PPPOX_DEAD;
64 }
65}
66
67EXPORT_SYMBOL(register_pppox_proto);
68EXPORT_SYMBOL(unregister_pppox_proto);
69EXPORT_SYMBOL(pppox_unbind_sock);
70
David S. Miller17ba15f2005-12-27 20:57:40 -080071int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
73 struct sock *sk = sock->sk;
74 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -070075 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 lock_sock(sk);
78
79 switch (cmd) {
80 case PPPIOCGCHAN: {
81 int index;
82 rc = -ENOTCONN;
83 if (!(sk->sk_state & PPPOX_CONNECTED))
84 break;
85
86 rc = -EINVAL;
87 index = ppp_channel_index(&po->chan);
88 if (put_user(index , (int __user *) arg))
89 break;
90
91 rc = 0;
92 sk->sk_state |= PPPOX_BOUND;
93 break;
94 }
95 default:
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -070096 rc = pppox_protos[sk->sk_protocol]->ioctl ?
97 pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
98 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 release_sock(sk);
101 return rc;
102}
103
David S. Miller17ba15f2005-12-27 20:57:40 -0800104EXPORT_SYMBOL(pppox_ioctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Eric Paris3f378b62009-11-05 22:18:14 -0800106static int pppox_create(struct net *net, struct socket *sock, int protocol,
107 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 int rc = -EPROTOTYPE;
110
111 if (protocol < 0 || protocol > PX_MAX_PROTO)
112 goto out;
113
114 rc = -EPROTONOSUPPORT;
Johannes Berga65e5d72008-07-09 10:28:38 +0200115 if (!pppox_protos[protocol])
Guillaume Nault681b4d82015-12-02 16:27:39 +0100116 request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (!pppox_protos[protocol] ||
118 !try_module_get(pppox_protos[protocol]->owner))
119 goto out;
120
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500121 rc = pppox_protos[protocol]->create(net, sock, kern);
David S. Miller17ba15f2005-12-27 20:57:40 -0800122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 module_put(pppox_protos[protocol]->owner);
124out:
125 return rc;
126}
127
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +0000128static const struct net_proto_family pppox_proto_family = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 .family = PF_PPPOX,
130 .create = pppox_create,
131 .owner = THIS_MODULE,
132};
133
134static int __init pppox_init(void)
135{
136 return sock_register(&pppox_proto_family);
137}
138
139static void __exit pppox_exit(void)
140{
141 sock_unregister(PF_PPPOX);
142}
143
144module_init(pppox_init);
145module_exit(pppox_exit);
146
147MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
148MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
149MODULE_LICENSE("GPL");
Guillaume Nault681b4d82015-12-02 16:27:39 +0100150MODULE_ALIAS_NETPROTO(PF_PPPOX);