Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * HDLC support | |
4 | * | |
5 | * Copyright (C) 1999 - 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/inetdevice.h> | |
22 | #include <linux/lapb.h> | |
23 | #include <linux/rtnetlink.h> | |
24 | #include <linux/hdlc.h> | |
25 | ||
26 | ||
ab611487 | 27 | static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
28 | { |
29 | return __constant_htons(ETH_P_IP); | |
30 | } | |
31 | ||
32 | ||
33 | ||
34 | int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr) | |
35 | { | |
36 | raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; | |
37 | const size_t size = sizeof(raw_hdlc_proto); | |
38 | raw_hdlc_proto new_settings; | |
39 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
40 | int result; | |
41 | ||
42 | switch (ifr->ifr_settings.type) { | |
43 | case IF_GET_PROTO: | |
44 | ifr->ifr_settings.type = IF_PROTO_HDLC; | |
45 | if (ifr->ifr_settings.size < size) { | |
46 | ifr->ifr_settings.size = size; /* data size wanted */ | |
47 | return -ENOBUFS; | |
48 | } | |
49 | if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) | |
50 | return -EFAULT; | |
51 | return 0; | |
52 | ||
53 | case IF_PROTO_HDLC: | |
54 | if (!capable(CAP_NET_ADMIN)) | |
55 | return -EPERM; | |
56 | ||
57 | if (dev->flags & IFF_UP) | |
58 | return -EBUSY; | |
59 | ||
60 | if (copy_from_user(&new_settings, raw_s, size)) | |
61 | return -EFAULT; | |
62 | ||
63 | if (new_settings.encoding == ENCODING_DEFAULT) | |
64 | new_settings.encoding = ENCODING_NRZ; | |
65 | ||
66 | if (new_settings.parity == PARITY_DEFAULT) | |
67 | new_settings.parity = PARITY_CRC16_PR1_CCITT; | |
68 | ||
69 | result = hdlc->attach(dev, new_settings.encoding, | |
70 | new_settings.parity); | |
71 | if (result) | |
72 | return result; | |
73 | ||
74 | hdlc_proto_detach(hdlc); | |
75 | memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); | |
76 | memset(&hdlc->proto, 0, sizeof(hdlc->proto)); | |
77 | ||
78 | hdlc->proto.type_trans = raw_type_trans; | |
79 | hdlc->proto.id = IF_PROTO_HDLC; | |
80 | dev->hard_start_xmit = hdlc->xmit; | |
81 | dev->hard_header = NULL; | |
82 | dev->type = ARPHRD_RAWHDLC; | |
83 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
84 | dev->addr_len = 0; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | return -EINVAL; | |
89 | } |