1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/** -*- linux-c -*- ***********************************************************
* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
*
* PPPoX --- Generic PPP encapsulation socket family
* PPPoE --- PPP over Ethernet (RFC 2516)
*
*
* Version: 0.5.2
*
* Author: Michal Ostrowski <mostrows@speakeasy.net>
*
* 051000 : Initialization cleanup
*
* License:
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/net.h>
#include <linux/init.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/ppp_channel.h>
#include <linux/kmod.h>
#include <net/sock.h>
#include <asm/uaccess.h>
static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
int register_pppox_proto(int proto_num, struct pppox_proto *pp)
{
if (proto_num < 0 || proto_num > PX_MAX_PROTO)
return -EINVAL;
if (pppox_protos[proto_num])
return -EALREADY;
pppox_protos[proto_num] = pp;
return 0;
}
void unregister_pppox_proto(int proto_num)
{
if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
pppox_protos[proto_num] = NULL;
}
void pppox_unbind_sock(struct sock *sk)
{
/* Clear connection to ppp device, if attached. */
if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED | PPPOX_ZOMBIE)) {
ppp_unregister_channel(&pppox_sk(sk)->chan);
sk->sk_state = PPPOX_DEAD;
}
}
EXPORT_SYMBOL(register_pppox_proto);
EXPORT_SYMBOL(unregister_pppox_proto);
EXPORT_SYMBOL(pppox_unbind_sock);
int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
struct pppox_sock *po = pppox_sk(sk);
int rc;
lock_sock(sk);
switch (cmd) {
case PPPIOCGCHAN: {
int index;
rc = -ENOTCONN;
if (!(sk->sk_state & PPPOX_CONNECTED))
break;
rc = -EINVAL;
index = ppp_channel_index(&po->chan);
if (put_user(index , (int __user *) arg))
break;
rc = 0;
sk->sk_state |= PPPOX_BOUND;
break;
}
default:
rc = pppox_protos[sk->sk_protocol]->ioctl ?
pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
}
release_sock(sk);
return rc;
}
EXPORT_SYMBOL(pppox_ioctl);
static int pppox_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
int rc = -EPROTOTYPE;
if (protocol < 0 || protocol > PX_MAX_PROTO)
goto out;
rc = -EPROTONOSUPPORT;
if (!pppox_protos[protocol])
request_module("pppox-proto-%d", protocol);
if (!pppox_protos[protocol] ||
!try_module_get(pppox_protos[protocol]->owner))
goto out;
rc = pppox_protos[protocol]->create(net, sock);
module_put(pppox_protos[protocol]->owner);
out:
return rc;
}
static const struct net_proto_family pppox_proto_family = {
.family = PF_PPPOX,
.create = pppox_create,
.owner = THIS_MODULE,
};
static int __init pppox_init(void)
{
return sock_register(&pppox_proto_family);
}
static void __exit pppox_exit(void)
{
sock_unregister(PF_PPPOX);
}
module_init(pppox_init);
module_exit(pppox_exit);
MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
MODULE_LICENSE("GPL");
|
