blob: 5dc153e8a29d14d9d0a68579dbe85718ea6d7955 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020025static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
26
Alexey Dobriyanab611482005-07-12 12:08:43 -070027static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Harvey Harrison09640e62009-02-01 00:45:17 -080029 return cpu_to_be16(ETH_P_IP);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030}
31
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020032static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
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:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020049 if (dev_to_hdlc(dev)->proto != &proto)
50 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 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 }
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020056 if (copy_to_user(raw_s, hdlc->state, size))
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 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
Krzysztof Halasa40d25142008-02-01 22:37:12 +010081 result = attach_hdlc_protocol(dev, &proto,
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020082 sizeof(raw_hdlc_proto));
83 if (result)
84 return result;
85 memcpy(hdlc->state, &new_settings, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 dev->type = ARPHRD_RAWHDLC;
Krzysztof Halasa4bc83b42006-07-21 14:41:01 -070087 netif_dormant_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return 0;
89 }
90
91 return -EINVAL;
92}
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020093
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");