blob: e23bc6656267401270488809d0a73d886203adb8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic HDLC support routines for Linux
3 * HDLC support
4 *
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02005 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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/module.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/poll.h>
16#include <linux/errno.h>
17#include <linux/if_arp.h>
18#include <linux/init.h>
19#include <linux/skbuff.h>
20#include <linux/pkt_sched.h>
21#include <linux/inetdevice.h>
22#include <linux/lapb.h>
23#include <linux/rtnetlink.h>
24#include <linux/hdlc.h>
25
26
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020027static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
28
Alexey Dobriyanab611482005-07-12 12:08:43 -070029static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
31 return __constant_htons(ETH_P_IP);
32}
33
34
35
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020036static struct hdlc_proto proto = {
37 .type_trans = raw_type_trans,
38 .ioctl = raw_ioctl,
39 .module = THIS_MODULE,
40};
41
42
43static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
45 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
46 const size_t size = sizeof(raw_hdlc_proto);
47 raw_hdlc_proto new_settings;
48 hdlc_device *hdlc = dev_to_hdlc(dev);
49 int result;
50
51 switch (ifr->ifr_settings.type) {
52 case IF_GET_PROTO:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020053 if (dev_to_hdlc(dev)->proto != &proto)
54 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 ifr->ifr_settings.type = IF_PROTO_HDLC;
56 if (ifr->ifr_settings.size < size) {
57 ifr->ifr_settings.size = size; /* data size wanted */
58 return -ENOBUFS;
59 }
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020060 if (copy_to_user(raw_s, hdlc->state, size))
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return -EFAULT;
62 return 0;
63
64 case IF_PROTO_HDLC:
65 if (!capable(CAP_NET_ADMIN))
66 return -EPERM;
67
68 if (dev->flags & IFF_UP)
69 return -EBUSY;
70
71 if (copy_from_user(&new_settings, raw_s, size))
72 return -EFAULT;
73
74 if (new_settings.encoding == ENCODING_DEFAULT)
75 new_settings.encoding = ENCODING_NRZ;
76
77 if (new_settings.parity == PARITY_DEFAULT)
78 new_settings.parity = PARITY_CRC16_PR1_CCITT;
79
80 result = hdlc->attach(dev, new_settings.encoding,
81 new_settings.parity);
82 if (result)
83 return result;
84
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020085 result = attach_hdlc_protocol(dev, &proto, NULL,
86 sizeof(raw_hdlc_proto));
87 if (result)
88 return result;
89 memcpy(hdlc->state, &new_settings, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 dev->hard_start_xmit = hdlc->xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 dev->type = ARPHRD_RAWHDLC;
Krzysztof Halasa4bc83b42006-07-21 14:41:01 -070092 netif_dormant_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return 0;
94 }
95
96 return -EINVAL;
97}
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020098
99
100static int __init mod_init(void)
101{
102 register_hdlc_protocol(&proto);
103 return 0;
104}
105
106
107
108static void __exit mod_exit(void)
109{
110 unregister_hdlc_protocol(&proto);
111}
112
113
114module_init(mod_init);
115module_exit(mod_exit);
116
117MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
118MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
119MODULE_LICENSE("GPL v2");