Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / net / wan / hdlc_raw.c
blob4feb45001aacf459f235c5393679f4e937db6ab5
1 /*
2 * Generic HDLC support routines for Linux
3 * HDLC support
5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
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.
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>
25 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
27 static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
29 return cpu_to_be16(ETH_P_IP);
32 static struct hdlc_proto proto = {
33 .type_trans = raw_type_trans,
34 .ioctl = raw_ioctl,
35 .module = THIS_MODULE,
39 static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
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;
47 switch (ifr->ifr_settings.type) {
48 case IF_GET_PROTO:
49 if (dev_to_hdlc(dev)->proto != &proto)
50 return -EINVAL;
51 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;
56 if (copy_to_user(raw_s, hdlc->state, size))
57 return -EFAULT;
58 return 0;
60 case IF_PROTO_HDLC:
61 if (!capable(CAP_NET_ADMIN))
62 return -EPERM;
64 if (dev->flags & IFF_UP)
65 return -EBUSY;
67 if (copy_from_user(&new_settings, raw_s, size))
68 return -EFAULT;
70 if (new_settings.encoding == ENCODING_DEFAULT)
71 new_settings.encoding = ENCODING_NRZ;
73 if (new_settings.parity == PARITY_DEFAULT)
74 new_settings.parity = PARITY_CRC16_PR1_CCITT;
76 result = hdlc->attach(dev, new_settings.encoding,
77 new_settings.parity);
78 if (result)
79 return result;
81 result = attach_hdlc_protocol(dev, &proto,
82 sizeof(raw_hdlc_proto));
83 if (result)
84 return result;
85 memcpy(hdlc->state, &new_settings, size);
86 dev->type = ARPHRD_RAWHDLC;
87 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
88 netif_dormant_off(dev);
89 return 0;
92 return -EINVAL;
96 static int __init mod_init(void)
98 register_hdlc_protocol(&proto);
99 return 0;
104 static void __exit mod_exit(void)
106 unregister_hdlc_protocol(&proto);
110 module_init(mod_init);
111 module_exit(mod_exit);
113 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
114 MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
115 MODULE_LICENSE("GPL v2");