tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/slab.h>
24
25
26static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
27
28static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
29{
30 return __constant_htons(ETH_P_IP);
31}
32
33
34
35static struct hdlc_proto proto = {
36 .type_trans = raw_type_trans,
37 .ioctl = raw_ioctl,
38 .module = THIS_MODULE,
39};
40
41
42static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
43{
44 raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
45 const size_t size = sizeof(raw_hdlc_proto);
46 raw_hdlc_proto new_settings;
47 hdlc_device *hdlc = dev_to_hdlc(dev);
48 int result;
49
50 switch (ifr->ifr_settings.type) {
51 case IF_GET_PROTO:
52 if (dev_to_hdlc(dev)->proto != &proto)
53 return -EINVAL;
54 ifr->ifr_settings.type = IF_PROTO_HDLC;
55 if (ifr->ifr_settings.size < size) {
56 ifr->ifr_settings.size = size; /* data size wanted */
57 return -ENOBUFS;
58 }
59 if (copy_to_user(raw_s, hdlc->state, size))
60 return -EFAULT;
61 return 0;
62
63 case IF_PROTO_HDLC:
64 if (!capable(CAP_NET_ADMIN))
65 return -EPERM;
66
67 if (dev->flags & IFF_UP)
68 return -EBUSY;
69
70 if (copy_from_user(&new_settings, raw_s, size))
71 return -EFAULT;
72
73 if (new_settings.encoding == ENCODING_DEFAULT)
74 new_settings.encoding = ENCODING_NRZ;
75
76 if (new_settings.parity == PARITY_DEFAULT)
77 new_settings.parity = PARITY_CRC16_PR1_CCITT;
78
79 result = hdlc->attach(dev, new_settings.encoding,
80 new_settings.parity);
81 if (result)
82 return result;
83
84 result = attach_hdlc_protocol(dev, &proto,
85 sizeof(raw_hdlc_proto));
86 if (result)
87 return result;
88 memcpy(hdlc->state, &new_settings, size);
89 dev->hard_start_xmit = hdlc->xmit;
90 dev->type = ARPHRD_RAWHDLC;
91 netif_dormant_off(dev);
92 return 0;
93 }
94
95 return -EINVAL;
96}
97
98
99static int __init mod_init(void)
100{
101 register_hdlc_protocol(&proto);
102 return 0;
103}
104
105
106
107static void __exit mod_exit(void)
108{
109 unregister_hdlc_protocol(&proto);
110}
111
112
113module_init(mod_init);
114module_exit(mod_exit);
115
116MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
117MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
118MODULE_LICENSE("GPL v2");