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12#include <linux/errno.h>
13#include <linux/etherdevice.h>
14#include <linux/gfp.h>
15#include <linux/hdlc.h>
16#include <linux/if_arp.h>
17#include <linux/inetdevice.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/pkt_sched.h>
22#include <linux/poll.h>
23#include <linux/rtnetlink.h>
24#include <linux/skbuff.h>
25
26static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
27
28static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev)
29{
30 int pad = ETH_ZLEN - skb->len;
31 if (pad > 0) {
32 int len = skb->len;
33 if (skb_tailroom(skb) < pad)
34 if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
35 dev->stats.tx_dropped++;
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
46static struct hdlc_proto proto = {
47 .type_trans = eth_type_trans,
48 .xmit = eth_tx,
49 .ioctl = raw_eth_ioctl,
50 .module = THIS_MODULE,
51};
52
53
54static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
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);
60 unsigned int old_qlen;
61 int result;
62
63 switch (ifr->ifr_settings.type) {
64 case IF_GET_PROTO:
65 if (dev_to_hdlc(dev)->proto != &proto)
66 return -EINVAL;
67 ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
68 if (ifr->ifr_settings.size < size) {
69 ifr->ifr_settings.size = size;
70 return -ENOBUFS;
71 }
72 if (copy_to_user(raw_s, hdlc->state, size))
73 return -EFAULT;
74 return 0;
75
76 case IF_PROTO_HDLC_ETH:
77 if (!capable(CAP_NET_ADMIN))
78 return -EPERM;
79
80 if (dev->flags & IFF_UP)
81 return -EBUSY;
82
83 if (copy_from_user(&new_settings, raw_s, size))
84 return -EFAULT;
85
86 if (new_settings.encoding == ENCODING_DEFAULT)
87 new_settings.encoding = ENCODING_NRZ;
88
89 if (new_settings.parity == PARITY_DEFAULT)
90 new_settings.parity = PARITY_CRC16_PR1_CCITT;
91
92 result = hdlc->attach(dev, new_settings.encoding,
93 new_settings.parity);
94 if (result)
95 return result;
96
97 result = attach_hdlc_protocol(dev, &proto,
98 sizeof(raw_hdlc_proto));
99 if (result)
100 return result;
101 memcpy(hdlc->state, &new_settings, size);
102 old_qlen = dev->tx_queue_len;
103 ether_setup(dev);
104 dev->tx_queue_len = old_qlen;
105 eth_hw_addr_random(dev);
106 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
107 netif_dormant_off(dev);
108 return 0;
109 }
110
111 return -EINVAL;
112}
113
114
115static int __init mod_init(void)
116{
117 register_hdlc_protocol(&proto);
118 return 0;
119}
120
121
122
123static void __exit mod_exit(void)
124{
125 unregister_hdlc_protocol(&proto);
126}
127
128
129module_init(mod_init);
130module_exit(mod_exit);
131
132MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
133MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
134MODULE_LICENSE("GPL v2");
135
