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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /** -*- linux-c -*- *********************************************************** |
3 | * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets | |
4 | * | |
5 | * PPPoX --- Generic PPP encapsulation socket family | |
6 | * PPPoE --- PPP over Ethernet (RFC 2516) | |
7 | * | |
1da177e4 LT |
8 | * Version: 0.5.2 |
9 | * | |
10 | * Author: Michal Ostrowski <mostrows@speakeasy.net> | |
11 | * | |
12 | * 051000 : Initialization cleanup | |
13 | * | |
14 | * License: | |
1da177e4 LT |
15 | */ |
16 | ||
17 | #include <linux/string.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/kernel.h> | |
055d8824 | 20 | #include <linux/compat.h> |
1da177e4 LT |
21 | #include <linux/errno.h> |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/net.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/if_pppox.h> | |
26 | #include <linux/ppp_defs.h> | |
4b32da2b | 27 | #include <linux/ppp-ioctl.h> |
1da177e4 | 28 | #include <linux/ppp_channel.h> |
65def812 | 29 | #include <linux/kmod.h> |
1da177e4 LT |
30 | |
31 | #include <net/sock.h> | |
32 | ||
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 | 34 | |
756e64a0 | 35 | static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1]; |
1da177e4 | 36 | |
756e64a0 | 37 | int register_pppox_proto(int proto_num, const struct pppox_proto *pp) |
1da177e4 LT |
38 | { |
39 | if (proto_num < 0 || proto_num > PX_MAX_PROTO) | |
40 | return -EINVAL; | |
41 | if (pppox_protos[proto_num]) | |
42 | return -EALREADY; | |
43 | pppox_protos[proto_num] = pp; | |
44 | return 0; | |
45 | } | |
46 | ||
47 | void unregister_pppox_proto(int proto_num) | |
48 | { | |
49 | if (proto_num >= 0 && proto_num <= PX_MAX_PROTO) | |
50 | pppox_protos[proto_num] = NULL; | |
51 | } | |
52 | ||
53 | void pppox_unbind_sock(struct sock *sk) | |
54 | { | |
55 | /* Clear connection to ppp device, if attached. */ | |
56 | ||
a8acce6a | 57 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) { |
1da177e4 LT |
58 | ppp_unregister_channel(&pppox_sk(sk)->chan); |
59 | sk->sk_state = PPPOX_DEAD; | |
60 | } | |
61 | } | |
62 | ||
63 | EXPORT_SYMBOL(register_pppox_proto); | |
64 | EXPORT_SYMBOL(unregister_pppox_proto); | |
65 | EXPORT_SYMBOL(pppox_unbind_sock); | |
66 | ||
17ba15fb | 67 | int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
68 | { |
69 | struct sock *sk = sock->sk; | |
70 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc | 71 | int rc; |
1da177e4 LT |
72 | |
73 | lock_sock(sk); | |
74 | ||
75 | switch (cmd) { | |
76 | case PPPIOCGCHAN: { | |
77 | int index; | |
78 | rc = -ENOTCONN; | |
79 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
80 | break; | |
81 | ||
82 | rc = -EINVAL; | |
83 | index = ppp_channel_index(&po->chan); | |
84 | if (put_user(index , (int __user *) arg)) | |
85 | break; | |
86 | ||
87 | rc = 0; | |
88 | sk->sk_state |= PPPOX_BOUND; | |
89 | break; | |
90 | } | |
91 | default: | |
86c1dcfc FZ |
92 | rc = pppox_protos[sk->sk_protocol]->ioctl ? |
93 | pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY; | |
94 | } | |
1da177e4 LT |
95 | |
96 | release_sock(sk); | |
97 | return rc; | |
98 | } | |
99 | ||
17ba15fb | 100 | EXPORT_SYMBOL(pppox_ioctl); |
1da177e4 | 101 | |
055d8824 AB |
102 | #ifdef CONFIG_COMPAT |
103 | int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
104 | { | |
105 | if (cmd == PPPOEIOCSFWD32) | |
106 | cmd = PPPOEIOCSFWD; | |
107 | ||
108 | return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL(pppox_compat_ioctl); | |
112 | #endif | |
113 | ||
3f378b68 EP |
114 | static int pppox_create(struct net *net, struct socket *sock, int protocol, |
115 | int kern) | |
1da177e4 LT |
116 | { |
117 | int rc = -EPROTOTYPE; | |
118 | ||
119 | if (protocol < 0 || protocol > PX_MAX_PROTO) | |
120 | goto out; | |
121 | ||
122 | rc = -EPROTONOSUPPORT; | |
a65e5d78 | 123 | if (!pppox_protos[protocol]) |
681b4d88 | 124 | request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol); |
1da177e4 LT |
125 | if (!pppox_protos[protocol] || |
126 | !try_module_get(pppox_protos[protocol]->owner)) | |
127 | goto out; | |
128 | ||
11aa9c28 | 129 | rc = pppox_protos[protocol]->create(net, sock, kern); |
17ba15fb | 130 | |
1da177e4 LT |
131 | module_put(pppox_protos[protocol]->owner); |
132 | out: | |
133 | return rc; | |
134 | } | |
135 | ||
ec1b4cf7 | 136 | static const struct net_proto_family pppox_proto_family = { |
1da177e4 LT |
137 | .family = PF_PPPOX, |
138 | .create = pppox_create, | |
139 | .owner = THIS_MODULE, | |
140 | }; | |
141 | ||
142 | static int __init pppox_init(void) | |
143 | { | |
144 | return sock_register(&pppox_proto_family); | |
145 | } | |
146 | ||
147 | static void __exit pppox_exit(void) | |
148 | { | |
149 | sock_unregister(PF_PPPOX); | |
150 | } | |
151 | ||
152 | module_init(pppox_init); | |
153 | module_exit(pppox_exit); | |
154 | ||
155 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
156 | MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)"); | |
157 | MODULE_LICENSE("GPL"); | |
681b4d88 | 158 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |