[PATCH] e1000: fix receive breakage
[linux-2.6] / 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 int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
72 {
73         struct sock *sk = sock->sk;
74         struct pppox_sock *po = pppox_sk(sk);
75         int rc = 0;
76
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:
96                 if (pppox_protos[sk->sk_protocol]->ioctl)
97                         rc = pppox_protos[sk->sk_protocol]->ioctl(sock, cmd,
98                                                                   arg);
99
100                 break;
101         };
102
103         release_sock(sk);
104         return rc;
105 }
106
107 EXPORT_SYMBOL(pppox_ioctl);
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
123         module_put(pppox_protos[protocol]->owner);
124 out:
125         return rc;
126 }
127
128 static struct net_proto_family pppox_proto_family = {
129         .family = PF_PPPOX,
130         .create = pppox_create,
131         .owner  = THIS_MODULE,
132 };
133
134 static int __init pppox_init(void)
135 {
136         return sock_register(&pppox_proto_family);
137 }
138
139 static void __exit pppox_exit(void)
140 {
141         sock_unregister(PF_PPPOX);
142 }
143
144 module_init(pppox_init);
145 module_exit(pppox_exit);
146
147 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
148 MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
149 MODULE_LICENSE("GPL");