Commit | Line | Data |
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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Generic HDLC support routines for Linux | |
4 | * HDLC support | |
5 | * | |
eb2a2fd9 | 6 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
7 | */ |
8 | ||
1da177e4 | 9 | #include <linux/errno.h> |
4dfce407 | 10 | #include <linux/hdlc.h> |
1da177e4 | 11 | #include <linux/if_arp.h> |
4dfce407 | 12 | #include <linux/inetdevice.h> |
1da177e4 | 13 | #include <linux/init.h> |
4dfce407 KH |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
1da177e4 | 16 | #include <linux/pkt_sched.h> |
4dfce407 | 17 | #include <linux/poll.h> |
1da177e4 | 18 | #include <linux/rtnetlink.h> |
4dfce407 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | |
21 | ||
ad7eab2a | 22 | static int raw_ioctl(struct net_device *dev, struct if_settings *ifs); |
eb2a2fd9 | 23 | |
ab611487 | 24 | static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 25 | { |
09640e63 | 26 | return cpu_to_be16(ETH_P_IP); |
1da177e4 LT |
27 | } |
28 | ||
eb2a2fd9 KH |
29 | static struct hdlc_proto proto = { |
30 | .type_trans = raw_type_trans, | |
31 | .ioctl = raw_ioctl, | |
32 | .module = THIS_MODULE, | |
33 | }; | |
34 | ||
35 | ||
ad7eab2a | 36 | static int raw_ioctl(struct net_device *dev, struct if_settings *ifs) |
1da177e4 | 37 | { |
ad7eab2a | 38 | raw_hdlc_proto __user *raw_s = ifs->ifs_ifsu.raw_hdlc; |
1da177e4 LT |
39 | const size_t size = sizeof(raw_hdlc_proto); |
40 | raw_hdlc_proto new_settings; | |
41 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
42 | int result; | |
43 | ||
ad7eab2a | 44 | switch (ifs->type) { |
1da177e4 | 45 | case IF_GET_PROTO: |
eb2a2fd9 KH |
46 | if (dev_to_hdlc(dev)->proto != &proto) |
47 | return -EINVAL; | |
ad7eab2a AB |
48 | ifs->type = IF_PROTO_HDLC; |
49 | if (ifs->size < size) { | |
50 | ifs->size = size; /* data size wanted */ | |
1da177e4 LT |
51 | return -ENOBUFS; |
52 | } | |
eb2a2fd9 | 53 | if (copy_to_user(raw_s, hdlc->state, size)) |
1da177e4 LT |
54 | return -EFAULT; |
55 | return 0; | |
56 | ||
57 | case IF_PROTO_HDLC: | |
58 | if (!capable(CAP_NET_ADMIN)) | |
59 | return -EPERM; | |
60 | ||
61 | if (dev->flags & IFF_UP) | |
62 | return -EBUSY; | |
63 | ||
64 | if (copy_from_user(&new_settings, raw_s, size)) | |
65 | return -EFAULT; | |
66 | ||
67 | if (new_settings.encoding == ENCODING_DEFAULT) | |
68 | new_settings.encoding = ENCODING_NRZ; | |
69 | ||
70 | if (new_settings.parity == PARITY_DEFAULT) | |
71 | new_settings.parity = PARITY_CRC16_PR1_CCITT; | |
72 | ||
73 | result = hdlc->attach(dev, new_settings.encoding, | |
74 | new_settings.parity); | |
75 | if (result) | |
76 | return result; | |
77 | ||
40d25142 | 78 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
79 | sizeof(raw_hdlc_proto)); |
80 | if (result) | |
81 | return result; | |
82 | memcpy(hdlc->state, &new_settings, size); | |
1da177e4 | 83 | dev->type = ARPHRD_RAWHDLC; |
2f8364a2 | 84 | call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); |
4bc83b4d | 85 | netif_dormant_off(dev); |
1da177e4 LT |
86 | return 0; |
87 | } | |
88 | ||
89 | return -EINVAL; | |
90 | } | |
eb2a2fd9 KH |
91 | |
92 | ||
a1739c30 | 93 | static int __init hdlc_raw_init(void) |
eb2a2fd9 KH |
94 | { |
95 | register_hdlc_protocol(&proto); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | ||
100 | ||
a1739c30 | 101 | static void __exit hdlc_raw_exit(void) |
eb2a2fd9 KH |
102 | { |
103 | unregister_hdlc_protocol(&proto); | |
104 | } | |
105 | ||
106 | ||
a1739c30 RD |
107 | module_init(hdlc_raw_init); |
108 | module_exit(hdlc_raw_exit); | |
eb2a2fd9 KH |
109 | |
110 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
111 | MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC"); | |
112 | MODULE_LICENSE("GPL v2"); |