Merge branch 'master' into gfs2
[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/module.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/poll.h>
16 #include <linux/errno.h>
17 #include <linux/if_arp.h>
18 #include <linux/init.h>
19 #include <linux/skbuff.h>
20 #include <linux/pkt_sched.h>
21 #include <linux/inetdevice.h>
22 #include <linux/lapb.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/hdlc.h>
25
26
27 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
28
29 static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
30 {
31         return __constant_htons(ETH_P_IP);
32 }
33
34
35
36 static struct hdlc_proto proto = {
37         .type_trans     = raw_type_trans,
38         .ioctl          = raw_ioctl,
39         .module         = THIS_MODULE,
40 };
41
42
43 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
44 {
45         raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
46         const size_t size = sizeof(raw_hdlc_proto);
47         raw_hdlc_proto new_settings;
48         hdlc_device *hdlc = dev_to_hdlc(dev);
49         int result;
50
51         switch (ifr->ifr_settings.type) {
52         case IF_GET_PROTO:
53                 if (dev_to_hdlc(dev)->proto != &proto)
54                         return -EINVAL;
55                 ifr->ifr_settings.type = IF_PROTO_HDLC;
56                 if (ifr->ifr_settings.size < size) {
57                         ifr->ifr_settings.size = size; /* data size wanted */
58                         return -ENOBUFS;
59                 }
60                 if (copy_to_user(raw_s, hdlc->state, size))
61                         return -EFAULT;
62                 return 0;
63
64         case IF_PROTO_HDLC:
65                 if (!capable(CAP_NET_ADMIN))
66                         return -EPERM;
67
68                 if (dev->flags & IFF_UP)
69                         return -EBUSY;
70
71                 if (copy_from_user(&new_settings, raw_s, size))
72                         return -EFAULT;
73
74                 if (new_settings.encoding == ENCODING_DEFAULT)
75                         new_settings.encoding = ENCODING_NRZ;
76
77                 if (new_settings.parity == PARITY_DEFAULT)
78                         new_settings.parity = PARITY_CRC16_PR1_CCITT;
79
80                 result = hdlc->attach(dev, new_settings.encoding,
81                                       new_settings.parity);
82                 if (result)
83                         return result;
84
85                 result = attach_hdlc_protocol(dev, &proto, NULL,
86                                               sizeof(raw_hdlc_proto));
87                 if (result)
88                         return result;
89                 memcpy(hdlc->state, &new_settings, size);
90                 dev->hard_start_xmit = hdlc->xmit;
91                 dev->hard_header = NULL;
92                 dev->type = ARPHRD_RAWHDLC;
93                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
94                 dev->addr_len = 0;
95                 netif_dormant_off(dev);
96                 return 0;
97         }
98
99         return -EINVAL;
100 }
101
102
103 static int __init mod_init(void)
104 {
105         register_hdlc_protocol(&proto);
106         return 0;
107 }
108
109
110
111 static void __exit mod_exit(void)
112 {
113         unregister_hdlc_protocol(&proto);
114 }
115
116
117 module_init(mod_init);
118 module_exit(mod_exit);
119
120 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
121 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
122 MODULE_LICENSE("GPL v2");