Merge master.kernel.org:/home/rmk/linux-2.6-serial
[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) 2002-2003 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/random.h>
22 #include <linux/inetdevice.h>
23 #include <linux/lapb.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/etherdevice.h>
26 #include <linux/hdlc.h>
27
28
29 static int eth_tx(struct sk_buff *skb, struct net_device *dev)
30 {
31         int pad = ETH_ZLEN - skb->len;
32         if (pad > 0) {          /* Pad the frame with zeros */
33                 int len = skb->len;
34                 if (skb_tailroom(skb) < pad)
35                         if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
36                                 hdlc_stats(dev)->tx_dropped++;
37                                 dev_kfree_skb(skb);
38                                 return 0;
39                         }
40                 skb_put(skb, pad);
41                 memset(skb->data + len, 0, pad);
42         }
43         return dev_to_hdlc(dev)->xmit(skb, dev);
44 }
45
46
47 int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
48 {
49         raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
50         const size_t size = sizeof(raw_hdlc_proto);
51         raw_hdlc_proto new_settings;
52         hdlc_device *hdlc = dev_to_hdlc(dev);
53         int result;
54         void *old_ch_mtu;
55         int old_qlen;
56
57         switch (ifr->ifr_settings.type) {
58         case IF_GET_PROTO:
59                 ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
60                 if (ifr->ifr_settings.size < size) {
61                         ifr->ifr_settings.size = size; /* data size wanted */
62                         return -ENOBUFS;
63                 }
64                 if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size))
65                         return -EFAULT;
66                 return 0;
67
68         case IF_PROTO_HDLC_ETH:
69                 if (!capable(CAP_NET_ADMIN))
70                         return -EPERM;
71
72                 if (dev->flags & IFF_UP)
73                         return -EBUSY;
74
75                 if (copy_from_user(&new_settings, raw_s, size))
76                         return -EFAULT;
77
78                 if (new_settings.encoding == ENCODING_DEFAULT)
79                         new_settings.encoding = ENCODING_NRZ;
80
81                 if (new_settings.parity == PARITY_DEFAULT)
82                         new_settings.parity = PARITY_CRC16_PR1_CCITT;
83
84                 result = hdlc->attach(dev, new_settings.encoding,
85                                       new_settings.parity);
86                 if (result)
87                         return result;
88
89                 hdlc_proto_detach(hdlc);
90                 memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size);
91                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
92
93                 hdlc->proto.type_trans = eth_type_trans;
94                 hdlc->proto.id = IF_PROTO_HDLC_ETH;
95                 dev->hard_start_xmit = eth_tx;
96                 old_ch_mtu = dev->change_mtu;
97                 old_qlen = dev->tx_queue_len;
98                 ether_setup(dev);
99                 dev->change_mtu = old_ch_mtu;
100                 dev->tx_queue_len = old_qlen;
101                 memcpy(dev->dev_addr, "\x00\x01", 2);
102                 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
103                 return 0;
104         }
105
106         return -EINVAL;
107 }