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 cpu_to_be16(ETH_P_IP);
31}
32
33static 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)
41{
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:
50 if (dev_to_hdlc(dev)->proto != &proto)
51 return -EINVAL;
52 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 }
57 if (copy_to_user(raw_s, hdlc->state, size))
58 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
82 result = attach_hdlc_protocol(dev, &proto,
83 sizeof(raw_hdlc_proto));
84 if (result)
85 return result;
86 memcpy(hdlc->state, &new_settings, size);
87 dev->type = ARPHRD_RAWHDLC;
88 netif_dormant_off(dev);
89 return 0;
90 }
91
92 return -EINVAL;
93}
94
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");