Create platform_device.h to contain all the platform device details.
[linux-2.6.git] / drivers / net / pppox.c
1 /** -*- 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>
25 #include <linux/slab.h>
26 #include <linux/errno.h>
27 #include <linux/netdevice.h>
28 #include <linux/net.h>
29 #include <linux/init.h>
30 #include <linux/if_pppox.h>
31 #include <linux/ppp_defs.h>
32 #include <linux/if_ppp.h>
33 #include <linux/ppp_channel.h>
34
35 #include <net/sock.h>
36
37 #include <asm/uaccess.h>
38
39 static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
40
41 int register_pppox_proto(int proto_num, struct pppox_proto *pp)
42 {
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
51 void 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
57 void pppox_unbind_sock(struct sock *sk)
58 {
59         /* Clear connection to ppp device, if attached. */
60
61         if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE)) {
62                 ppp_unregister_channel(&pppox_sk(sk)->chan);
63                 sk->sk_state = PPPOX_DEAD;
64         }
65 }
66
67 EXPORT_SYMBOL(register_pppox_proto);
68 EXPORT_SYMBOL(unregister_pppox_proto);
69 EXPORT_SYMBOL(pppox_unbind_sock);
70
71 static int pppox_ioctl(struct socket* sock, unsigned int cmd, 
72                        unsigned long arg)
73 {
74         struct sock *sk = sock->sk;
75         struct pppox_sock *po = pppox_sk(sk);
76         int rc = 0;
77
78         lock_sock(sk);
79
80         switch (cmd) {
81         case PPPIOCGCHAN: {
82                 int index;
83                 rc = -ENOTCONN;
84                 if (!(sk->sk_state & PPPOX_CONNECTED))
85                         break;
86
87                 rc = -EINVAL;
88                 index = ppp_channel_index(&po->chan);
89                 if (put_user(index , (int __user *) arg))
90                         break;
91
92                 rc = 0;
93                 sk->sk_state |= PPPOX_BOUND;
94                 break;
95         }
96         default:
97                 if (pppox_protos[sk->sk_protocol]->ioctl)
98                         rc = pppox_protos[sk->sk_protocol]->ioctl(sock, cmd,
99                                                                   arg);
100
101                 break;
102         };
103
104         release_sock(sk);
105         return rc;
106 }
107
108
109 static int pppox_create(struct socket *sock, int protocol)
110 {
111         int rc = -EPROTOTYPE;
112
113         if (protocol < 0 || protocol > PX_MAX_PROTO)
114                 goto out;
115
116         rc = -EPROTONOSUPPORT;
117         if (!pppox_protos[protocol] ||
118             !try_module_get(pppox_protos[protocol]->owner))
119                 goto out;
120
121         rc = pppox_protos[protocol]->create(sock);
122         if (!rc) {
123                 /* We get to set the ioctl handler. */
124                 /* For everything else, pppox is just a shell. */
125                 sock->ops->ioctl = pppox_ioctl;
126         }
127         module_put(pppox_protos[protocol]->owner);
128 out:
129         return rc;
130 }
131
132 static struct net_proto_family pppox_proto_family = {
133         .family = PF_PPPOX,
134         .create = pppox_create,
135         .owner  = THIS_MODULE,
136 };
137
138 static int __init pppox_init(void)
139 {
140         return sock_register(&pppox_proto_family);
141 }
142
143 static void __exit pppox_exit(void)
144 {
145         sock_unregister(PF_PPPOX);
146 }
147
148 module_init(pppox_init);
149 module_exit(pppox_exit);
150
151 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
152 MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
153 MODULE_LICENSE("GPL");