1/*
2 * Generic HDLC support routines for Linux
3 * HDLC support
4 *
5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License
9 * as published by the Free Software Foundation.
10 */
11
12#include <linux/errno.h>
13#include <linux/hdlc.h>
14#include <linux/if_arp.h>
15#include <linux/inetdevice.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/pkt_sched.h>
20#include <linux/poll.h>
21#include <linux/rtnetlink.h>
22#include <linux/skbuff.h>
23
24
25static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
26
27static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
28{
29	return cpu_to_be16(ETH_P_IP);
30}
31
32static struct hdlc_proto proto = {
33	.type_trans	= raw_type_trans,
34	.ioctl		= raw_ioctl,
35	.module		= THIS_MODULE,
36};
37
38
39static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
40{
41	raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
42	const size_t size = sizeof(raw_hdlc_proto);
43	raw_hdlc_proto new_settings;
44	hdlc_device *hdlc = dev_to_hdlc(dev);
45	int result;
46
47	switch (ifr->ifr_settings.type) {
48	case IF_GET_PROTO:
49		if (dev_to_hdlc(dev)->proto != &proto)
50			return -EINVAL;
51		ifr->ifr_settings.type = IF_PROTO_HDLC;
52		if (ifr->ifr_settings.size < size) {
53			ifr->ifr_settings.size = size; /* data size wanted */
54			return -ENOBUFS;
55		}
56		if (copy_to_user(raw_s, hdlc->state, size))
57			return -EFAULT;
58		return 0;
59
60	case IF_PROTO_HDLC:
61		if (!capable(CAP_NET_ADMIN))
62			return -EPERM;
63
64		if (dev->flags & IFF_UP)
65			return -EBUSY;
66
67		if (copy_from_user(&new_settings, raw_s, size))
68			return -EFAULT;
69
70		if (new_settings.encoding == ENCODING_DEFAULT)
71			new_settings.encoding = ENCODING_NRZ;
72
73		if (new_settings.parity == PARITY_DEFAULT)
74			new_settings.parity = PARITY_CRC16_PR1_CCITT;
75
76		result = hdlc->attach(dev, new_settings.encoding,
77				      new_settings.parity);
78		if (result)
79			return result;
80
81		result = attach_hdlc_protocol(dev, &proto,
82					      sizeof(raw_hdlc_proto));
83		if (result)
84			return result;
85		memcpy(hdlc->state, &new_settings, size);
86		dev->type = ARPHRD_RAWHDLC;
87		netif_dormant_off(dev);
88		return 0;
89	}
90
91	return -EINVAL;
92}
93
94
95static int __init mod_init(void)
96{
97	register_hdlc_protocol(&proto);
98	return 0;
99}
100
101
102
103static void __exit mod_exit(void)
104{
105	unregister_hdlc_protocol(&proto);
106}
107
108
109module_init(mod_init);
110module_exit(mod_exit);
111
112MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
113MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
114MODULE_LICENSE("GPL v2");
115