Merge branch 'for-2.6.30' into for-2.6.31
[linux-2.6] / drivers / net / wan / hdlc_raw_eth.c
1 /*
2  * Generic HDLC support routines for Linux
3  * HDLC Ethernet emulation support
4  *
5  * Copyright (C) 2002-2006 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/etherdevice.h>
14 #include <linux/hdlc.h>
15 #include <linux/if_arp.h>
16 #include <linux/inetdevice.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/pkt_sched.h>
21 #include <linux/poll.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25
26 static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
27
28 static int eth_tx(struct sk_buff *skb, struct net_device *dev)
29 {
30         int pad = ETH_ZLEN - skb->len;
31         if (pad > 0) {          /* Pad the frame with zeros */
32                 int len = skb->len;
33                 if (skb_tailroom(skb) < pad)
34                         if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
35                                 dev->stats.tx_dropped++;
36                                 dev_kfree_skb(skb);
37                                 return 0;
38                         }
39                 skb_put(skb, pad);
40                 memset(skb->data + len, 0, pad);
41         }
42         return dev_to_hdlc(dev)->xmit(skb, dev);
43 }
44
45
46 static struct hdlc_proto proto = {
47         .type_trans     = eth_type_trans,
48         .xmit           = eth_tx,
49         .ioctl          = raw_eth_ioctl,
50         .module         = THIS_MODULE,
51 };
52
53
54 static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
55 {
56         raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
57         const size_t size = sizeof(raw_hdlc_proto);
58         raw_hdlc_proto new_settings;
59         hdlc_device *hdlc = dev_to_hdlc(dev);
60         int result, old_qlen;
61
62         switch (ifr->ifr_settings.type) {
63         case IF_GET_PROTO:
64                 if (dev_to_hdlc(dev)->proto != &proto)
65                         return -EINVAL;
66                 ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
67                 if (ifr->ifr_settings.size < size) {
68                         ifr->ifr_settings.size = size; /* data size wanted */
69                         return -ENOBUFS;
70                 }
71                 if (copy_to_user(raw_s, hdlc->state, size))
72                         return -EFAULT;
73                 return 0;
74
75         case IF_PROTO_HDLC_ETH:
76                 if (!capable(CAP_NET_ADMIN))
77                         return -EPERM;
78
79                 if (dev->flags & IFF_UP)
80                         return -EBUSY;
81
82                 if (copy_from_user(&new_settings, raw_s, size))
83                         return -EFAULT;
84
85                 if (new_settings.encoding == ENCODING_DEFAULT)
86                         new_settings.encoding = ENCODING_NRZ;
87
88                 if (new_settings.parity == PARITY_DEFAULT)
89                         new_settings.parity = PARITY_CRC16_PR1_CCITT;
90
91                 result = hdlc->attach(dev, new_settings.encoding,
92                                       new_settings.parity);
93                 if (result)
94                         return result;
95
96                 result = attach_hdlc_protocol(dev, &proto,
97                                               sizeof(raw_hdlc_proto));
98                 if (result)
99                         return result;
100                 memcpy(hdlc->state, &new_settings, size);
101                 old_qlen = dev->tx_queue_len;
102                 ether_setup(dev);
103                 dev->tx_queue_len = old_qlen;
104                 random_ether_addr(dev->dev_addr);
105                 netif_dormant_off(dev);
106                 return 0;
107         }
108
109         return -EINVAL;
110 }
111
112
113 static int __init mod_init(void)
114 {
115         register_hdlc_protocol(&proto);
116         return 0;
117 }
118
119
120
121 static void __exit mod_exit(void)
122 {
123         unregister_hdlc_protocol(&proto);
124 }
125
126
127 module_init(mod_init);
128 module_exit(mod_exit);
129
130 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
131 MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
132 MODULE_LICENSE("GPL v2");