blob: 19f51fdd55227debdbcae8b10ab100feb93ee3d6 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/hdlc.h>
Krzysztof HaƂasa4dfce402008-06-30 19:06:40 +020014#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#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020026static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
27
Alexey Dobriyanab611482005-07-12 12:08:43 -070028static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
Harvey Harrison09640e62009-02-01 00:45:17 -080030 return cpu_to_be16(ETH_P_IP);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031}
32
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020033static struct hdlc_proto proto = {
34 .type_trans = raw_type_trans,
35 .ioctl = raw_ioctl,
36 .module = THIS_MODULE,
37};
38
39
40static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
43 const size_t size = sizeof(raw_hdlc_proto);
44 raw_hdlc_proto new_settings;
45 hdlc_device *hdlc = dev_to_hdlc(dev);
46 int result;
47
48 switch (ifr->ifr_settings.type) {
49 case IF_GET_PROTO:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020050 if (dev_to_hdlc(dev)->proto != &proto)
51 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 ifr->ifr_settings.type = IF_PROTO_HDLC;
53 if (ifr->ifr_settings.size < size) {
54 ifr->ifr_settings.size = size; /* data size wanted */
55 return -ENOBUFS;
56 }
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020057 if (copy_to_user(raw_s, hdlc->state, size))
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return -EFAULT;
59 return 0;
60
61 case IF_PROTO_HDLC:
62 if (!capable(CAP_NET_ADMIN))
63 return -EPERM;
64
65 if (dev->flags & IFF_UP)
66 return -EBUSY;
67
68 if (copy_from_user(&new_settings, raw_s, size))
69 return -EFAULT;
70
71 if (new_settings.encoding == ENCODING_DEFAULT)
72 new_settings.encoding = ENCODING_NRZ;
73
74 if (new_settings.parity == PARITY_DEFAULT)
75 new_settings.parity = PARITY_CRC16_PR1_CCITT;
76
77 result = hdlc->attach(dev, new_settings.encoding,
78 new_settings.parity);
79 if (result)
80 return result;
81
Krzysztof Halasa40d25142008-02-01 22:37:12 +010082 result = attach_hdlc_protocol(dev, &proto,
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020083 sizeof(raw_hdlc_proto));
84 if (result)
85 return result;
86 memcpy(hdlc->state, &new_settings, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 dev->type = ARPHRD_RAWHDLC;
Krzysztof Halasa4bc83b42006-07-21 14:41:01 -070088 netif_dormant_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 return 0;
90 }
91
92 return -EINVAL;
93}
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020094
95
96static int __init mod_init(void)
97{
98 register_hdlc_protocol(&proto);
99 return 0;
100}
101
102
103
104static void __exit mod_exit(void)
105{
106 unregister_hdlc_protocol(&proto);
107}
108
109
110module_init(mod_init);
111module_exit(mod_exit);
112
113MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
114MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
115MODULE_LICENSE("GPL v2");