Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[linux-2.6] / drivers / net / wan / hdlc_raw.c
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
26 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
27
28 static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
29 {
30         return __constant_htons(ETH_P_IP);
31 }
32
33
34
35 static struct hdlc_proto proto = {
36         .type_trans     = raw_type_trans,
37         .ioctl          = raw_ioctl,
38         .module         = THIS_MODULE,
39 };
40
41
42 static 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
99 static int __init mod_init(void)
100 {
101         register_hdlc_protocol(&proto);
102         return 0;
103 }
104
105
106
107 static void __exit mod_exit(void)
108 {
109         unregister_hdlc_protocol(&proto);
110 }
111
112
113 module_init(mod_init);
114 module_exit(mod_exit);
115
116 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
117 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
118 MODULE_LICENSE("GPL v2");