Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * HDLC Ethernet emulation support | |
4 | * | |
eb2a2fd9 | 5 | * Copyright (C) 2002-2006 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/etherdevice.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
4dfce407 | 15 | #include <linux/hdlc.h> |
1da177e4 | 16 | #include <linux/if_arp.h> |
4dfce407 | 17 | #include <linux/inetdevice.h> |
1da177e4 | 18 | #include <linux/init.h> |
4dfce407 KH |
19 | #include <linux/kernel.h> |
20 | #include <linux/module.h> | |
1da177e4 | 21 | #include <linux/pkt_sched.h> |
4dfce407 | 22 | #include <linux/poll.h> |
1da177e4 | 23 | #include <linux/rtnetlink.h> |
4dfce407 | 24 | #include <linux/skbuff.h> |
1da177e4 | 25 | |
eb2a2fd9 | 26 | static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); |
1da177e4 | 27 | |
d71a6749 | 28 | static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
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)) { | |
198191c4 | 35 | dev->stats.tx_dropped++; |
1da177e4 LT |
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 | ||
eb2a2fd9 KH |
46 | static struct hdlc_proto proto = { |
47 | .type_trans = eth_type_trans, | |
991990a1 | 48 | .xmit = eth_tx, |
eb2a2fd9 KH |
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) | |
1da177e4 LT |
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); | |
991990a1 | 60 | int result, old_qlen; |
1da177e4 LT |
61 | |
62 | switch (ifr->ifr_settings.type) { | |
63 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
64 | if (dev_to_hdlc(dev)->proto != &proto) |
65 | return -EINVAL; | |
1da177e4 LT |
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 | } | |
eb2a2fd9 | 71 | if (copy_to_user(raw_s, hdlc->state, size)) |
1da177e4 LT |
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 | ||
40d25142 | 96 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
97 | sizeof(raw_hdlc_proto)); |
98 | if (result) | |
99 | return result; | |
100 | memcpy(hdlc->state, &new_settings, size); | |
1da177e4 LT |
101 | old_qlen = dev->tx_queue_len; |
102 | ether_setup(dev); | |
1da177e4 | 103 | dev->tx_queue_len = old_qlen; |
f2cedb63 | 104 | eth_hw_addr_random(dev); |
2f8364a2 | 105 | call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); |
4bc83b4d | 106 | netif_dormant_off(dev); |
1da177e4 LT |
107 | return 0; |
108 | } | |
109 | ||
110 | return -EINVAL; | |
111 | } | |
eb2a2fd9 KH |
112 | |
113 | ||
114 | static int __init mod_init(void) | |
115 | { | |
116 | register_hdlc_protocol(&proto); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | ||
121 | ||
122 | static void __exit mod_exit(void) | |
123 | { | |
124 | unregister_hdlc_protocol(&proto); | |
125 | } | |
126 | ||
127 | ||
128 | module_init(mod_init); | |
129 | module_exit(mod_exit); | |
130 | ||
131 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
132 | MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC"); | |
133 | MODULE_LICENSE("GPL v2"); |