Commit | Line | Data |
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1da177e4 LT |
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 | } |