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1da177e4 LT |
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"); |