Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * HDLC support | |
4 | * | |
eb2a2fd9 | 5 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
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 | ||
1da177e4 | 12 | #include <linux/errno.h> |
4dfce407 | 13 | #include <linux/hdlc.h> |
1da177e4 | 14 | #include <linux/if_arp.h> |
4dfce407 | 15 | #include <linux/inetdevice.h> |
1da177e4 | 16 | #include <linux/init.h> |
4dfce407 KH |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
1da177e4 | 19 | #include <linux/pkt_sched.h> |
4dfce407 | 20 | #include <linux/poll.h> |
1da177e4 | 21 | #include <linux/rtnetlink.h> |
4dfce407 KH |
22 | #include <linux/skbuff.h> |
23 | #include <linux/slab.h> | |
1da177e4 LT |
24 | |
25 | ||
eb2a2fd9 KH |
26 | static int raw_ioctl(struct net_device *dev, struct ifreq *ifr); |
27 | ||
ab611487 | 28 | static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 29 | { |
09640e63 | 30 | return cpu_to_be16(ETH_P_IP); |
1da177e4 LT |
31 | } |
32 | ||
eb2a2fd9 KH |
33 | static struct hdlc_proto proto = { |
34 | .type_trans = raw_type_trans, | |
35 | .ioctl = raw_ioctl, | |
36 | .module = THIS_MODULE, | |
37 | }; | |
38 | ||
39 | ||
40 | static int raw_ioctl(struct net_device *dev, struct ifreq *ifr) | |
1da177e4 LT |
41 | { |
42 | raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; | |
43 | const size_t size = sizeof(raw_hdlc_proto); | |
44 | raw_hdlc_proto new_settings; | |
45 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
46 | int result; | |
47 | ||
48 | switch (ifr->ifr_settings.type) { | |
49 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
50 | if (dev_to_hdlc(dev)->proto != &proto) |
51 | return -EINVAL; | |
1da177e4 LT |
52 | ifr->ifr_settings.type = IF_PROTO_HDLC; |
53 | if (ifr->ifr_settings.size < size) { | |
54 | ifr->ifr_settings.size = size; /* data size wanted */ | |
55 | return -ENOBUFS; | |
56 | } | |
eb2a2fd9 | 57 | if (copy_to_user(raw_s, hdlc->state, size)) |
1da177e4 LT |
58 | return -EFAULT; |
59 | return 0; | |
60 | ||
61 | case IF_PROTO_HDLC: | |
62 | if (!capable(CAP_NET_ADMIN)) | |
63 | return -EPERM; | |
64 | ||
65 | if (dev->flags & IFF_UP) | |
66 | return -EBUSY; | |
67 | ||
68 | if (copy_from_user(&new_settings, raw_s, size)) | |
69 | return -EFAULT; | |
70 | ||
71 | if (new_settings.encoding == ENCODING_DEFAULT) | |
72 | new_settings.encoding = ENCODING_NRZ; | |
73 | ||
74 | if (new_settings.parity == PARITY_DEFAULT) | |
75 | new_settings.parity = PARITY_CRC16_PR1_CCITT; | |
76 | ||
77 | result = hdlc->attach(dev, new_settings.encoding, | |
78 | new_settings.parity); | |
79 | if (result) | |
80 | return result; | |
81 | ||
40d25142 | 82 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
83 | sizeof(raw_hdlc_proto)); |
84 | if (result) | |
85 | return result; | |
86 | memcpy(hdlc->state, &new_settings, size); | |
1da177e4 | 87 | dev->type = ARPHRD_RAWHDLC; |
4bc83b4d | 88 | netif_dormant_off(dev); |
1da177e4 LT |
89 | return 0; |
90 | } | |
91 | ||
92 | return -EINVAL; | |
93 | } | |
eb2a2fd9 KH |
94 | |
95 | ||
96 | static int __init mod_init(void) | |
97 | { | |
98 | register_hdlc_protocol(&proto); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | ||
103 | ||
104 | static void __exit mod_exit(void) | |
105 | { | |
106 | unregister_hdlc_protocol(&proto); | |
107 | } | |
108 | ||
109 | ||
110 | module_init(mod_init); | |
111 | module_exit(mod_exit); | |
112 | ||
113 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
114 | MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); | |
115 | MODULE_LICENSE("GPL v2"); |