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1/*
2 * Generic HDLC support routines for Linux
3 * HDLC Ethernet emulation support
4 *
5 * Copyright (C) 2002-2006 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/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) { /* 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)) {
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 int result, old_qlen;
61
62 switch (ifr->ifr_settings.type) {
63 case IF_GET_PROTO:
64 if (dev_to_hdlc(dev)->proto != &proto)
65 return -EINVAL;
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 }
71 if (copy_to_user(raw_s, hdlc->state, size))
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
96 result = attach_hdlc_protocol(dev, &proto,
97 sizeof(raw_hdlc_proto));
98 if (result)
99 return result;
100 memcpy(hdlc->state, &new_settings, size);
101 old_qlen = dev->tx_queue_len;
102 ether_setup(dev);
103 dev->tx_queue_len = old_qlen;
104 eth_hw_addr_random(dev);
105 netif_dormant_off(dev);
106 return 0;
107 }
108
109 return -EINVAL;
110}
111
112
113static int __init mod_init(void)
114{
115 register_hdlc_protocol(&proto);
116 return 0;
117}
118
119
120
121static void __exit mod_exit(void)
122{
123 unregister_hdlc_protocol(&proto);
124}
125
126
127module_init(mod_init);
128module_exit(mod_exit);
129
130MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
131MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
132MODULE_LICENSE("GPL v2");
1/*
2 * Generic HDLC support routines for Linux
3 * HDLC Ethernet emulation support
4 *
5 * Copyright (C) 2002-2006 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/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) { /* 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)) {
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 int result, old_qlen;
61
62 switch (ifr->ifr_settings.type) {
63 case IF_GET_PROTO:
64 if (dev_to_hdlc(dev)->proto != &proto)
65 return -EINVAL;
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 }
71 if (copy_to_user(raw_s, hdlc->state, size))
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
96 result = attach_hdlc_protocol(dev, &proto,
97 sizeof(raw_hdlc_proto));
98 if (result)
99 return result;
100 memcpy(hdlc->state, &new_settings, size);
101 old_qlen = dev->tx_queue_len;
102 ether_setup(dev);
103 dev->tx_queue_len = old_qlen;
104 eth_hw_addr_random(dev);
105 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
106 netif_dormant_off(dev);
107 return 0;
108 }
109
110 return -EINVAL;
111}
112
113
114static int __init mod_init(void)
115{
116 register_hdlc_protocol(&proto);
117 return 0;
118}
119
120
121
122static void __exit mod_exit(void)
123{
124 unregister_hdlc_protocol(&proto);
125}
126
127
128module_init(mod_init);
129module_exit(mod_exit);
130
131MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
132MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
133MODULE_LICENSE("GPL v2");