2 * Generic HDLC support routines for Linux
4 * Copyright (C) 1999 - 2005 Krzysztof Halasa <khc@pm.waw.pl>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
10 * Currently supported:
13 * * Frame Relay with ANSI or CCITT LMI (both user and network side)
17 * Use sethdlc utility to set line parameters, protocol and PVCs
20 * - proto.open(), close(), start(), stop() calls are serialized.
21 * The order is: open, [ start, stop ... ] close ...
22 * - proto.start() and stop() are called with spin_lock_irq held.
25 #include <linux/config.h>
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/poll.h>
30 #include <linux/errno.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/skbuff.h>
34 #include <linux/pkt_sched.h>
35 #include <linux/inetdevice.h>
36 #include <linux/lapb.h>
37 #include <linux/rtnetlink.h>
38 #include <linux/hdlc.h>
41 static const char* version
= "HDLC support module revision 1.18";
46 static int hdlc_change_mtu(struct net_device
*dev
, int new_mtu
)
48 if ((new_mtu
< 68) || (new_mtu
> HDLC_MAX_MTU
))
56 static struct net_device_stats
*hdlc_get_stats(struct net_device
*dev
)
58 return hdlc_stats(dev
);
63 static int hdlc_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
64 struct packet_type
*p
)
66 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
67 if (hdlc
->proto
.netif_rx
)
68 return hdlc
->proto
.netif_rx(skb
);
70 hdlc
->stats
.rx_dropped
++; /* Shouldn't happen */
77 static void __hdlc_set_carrier_on(struct net_device
*dev
)
79 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
80 if (hdlc
->proto
.start
)
81 return hdlc
->proto
.start(dev
);
83 if (netif_carrier_ok(dev
))
84 printk(KERN_ERR
"hdlc_set_carrier_on(): already on\n");
86 netif_carrier_on(dev
);
91 static void __hdlc_set_carrier_off(struct net_device
*dev
)
93 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
95 return hdlc
->proto
.stop(dev
);
98 if (!netif_carrier_ok(dev
))
99 printk(KERN_ERR
"hdlc_set_carrier_off(): already off\n");
101 netif_carrier_off(dev
);
106 void hdlc_set_carrier(int on
, struct net_device
*dev
)
108 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
113 printk(KERN_DEBUG
"hdlc_set_carrier %i\n", on
);
116 spin_lock_irqsave(&hdlc
->state_lock
, flags
);
118 if (hdlc
->carrier
== on
)
119 goto carrier_exit
; /* no change in DCD line level */
122 printk(KERN_INFO
"%s: carrier %s\n", dev
->name
, on
? "ON" : "off");
130 printk(KERN_INFO
"%s: Carrier detected\n", dev
->name
);
131 __hdlc_set_carrier_on(dev
);
133 printk(KERN_INFO
"%s: Carrier lost\n", dev
->name
);
134 __hdlc_set_carrier_off(dev
);
138 spin_unlock_irqrestore(&hdlc
->state_lock
, flags
);
143 /* Must be called by hardware driver when HDLC device is being opened */
144 int hdlc_open(struct net_device
*dev
)
146 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
148 printk(KERN_DEBUG
"hdlc_open() carrier %i open %i\n",
149 hdlc
->carrier
, hdlc
->open
);
152 if (hdlc
->proto
.id
== -1)
153 return -ENOSYS
; /* no protocol attached */
155 if (hdlc
->proto
.open
) {
156 int result
= hdlc
->proto
.open(dev
);
161 spin_lock_irq(&hdlc
->state_lock
);
164 printk(KERN_INFO
"%s: Carrier detected\n", dev
->name
);
165 __hdlc_set_carrier_on(dev
);
167 printk(KERN_INFO
"%s: No carrier\n", dev
->name
);
171 spin_unlock_irq(&hdlc
->state_lock
);
177 /* Must be called by hardware driver when HDLC device is being closed */
178 void hdlc_close(struct net_device
*dev
)
180 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
182 printk(KERN_DEBUG
"hdlc_close() carrier %i open %i\n",
183 hdlc
->carrier
, hdlc
->open
);
186 spin_lock_irq(&hdlc
->state_lock
);
190 __hdlc_set_carrier_off(dev
);
192 spin_unlock_irq(&hdlc
->state_lock
);
194 if (hdlc
->proto
.close
)
195 hdlc
->proto
.close(dev
);
200 #ifndef CONFIG_HDLC_RAW
201 #define hdlc_raw_ioctl(dev, ifr) -ENOSYS
204 #ifndef CONFIG_HDLC_RAW_ETH
205 #define hdlc_raw_eth_ioctl(dev, ifr) -ENOSYS
208 #ifndef CONFIG_HDLC_PPP
209 #define hdlc_ppp_ioctl(dev, ifr) -ENOSYS
212 #ifndef CONFIG_HDLC_CISCO
213 #define hdlc_cisco_ioctl(dev, ifr) -ENOSYS
216 #ifndef CONFIG_HDLC_FR
217 #define hdlc_fr_ioctl(dev, ifr) -ENOSYS
220 #ifndef CONFIG_HDLC_X25
221 #define hdlc_x25_ioctl(dev, ifr) -ENOSYS
225 int hdlc_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
227 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
230 if (cmd
!= SIOCWANDEV
)
233 switch(ifr
->ifr_settings
.type
) {
235 case IF_PROTO_HDLC_ETH
:
240 proto
= ifr
->ifr_settings
.type
;
244 proto
= hdlc
->proto
.id
;
248 case IF_PROTO_HDLC
: return hdlc_raw_ioctl(dev
, ifr
);
249 case IF_PROTO_HDLC_ETH
: return hdlc_raw_eth_ioctl(dev
, ifr
);
250 case IF_PROTO_PPP
: return hdlc_ppp_ioctl(dev
, ifr
);
251 case IF_PROTO_CISCO
: return hdlc_cisco_ioctl(dev
, ifr
);
252 case IF_PROTO_FR
: return hdlc_fr_ioctl(dev
, ifr
);
253 case IF_PROTO_X25
: return hdlc_x25_ioctl(dev
, ifr
);
254 default: return -EINVAL
;
258 static void hdlc_setup(struct net_device
*dev
)
260 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
262 dev
->get_stats
= hdlc_get_stats
;
263 dev
->change_mtu
= hdlc_change_mtu
;
264 dev
->mtu
= HDLC_MAX_MTU
;
266 dev
->type
= ARPHRD_RAWHDLC
;
267 dev
->hard_header_len
= 16;
269 dev
->flags
= IFF_POINTOPOINT
| IFF_NOARP
;
272 hdlc
->proto
.detach
= NULL
;
275 spin_lock_init(&hdlc
->state_lock
);
278 struct net_device
*alloc_hdlcdev(void *priv
)
280 struct net_device
*dev
;
281 dev
= alloc_netdev(sizeof(hdlc_device
), "hdlc%d", hdlc_setup
);
283 dev_to_hdlc(dev
)->priv
= priv
;
287 int register_hdlc_device(struct net_device
*dev
)
289 int result
= dev_alloc_name(dev
, "hdlc%d");
293 result
= register_netdev(dev
);
297 if (netif_carrier_ok(dev
))
298 netif_carrier_off(dev
); /* no carrier until DCD goes up */
305 void unregister_hdlc_device(struct net_device
*dev
)
308 hdlc_proto_detach(dev_to_hdlc(dev
));
309 unregister_netdevice(dev
);
315 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
316 MODULE_DESCRIPTION("HDLC support module");
317 MODULE_LICENSE("GPL v2");
319 EXPORT_SYMBOL(hdlc_open
);
320 EXPORT_SYMBOL(hdlc_close
);
321 EXPORT_SYMBOL(hdlc_set_carrier
);
322 EXPORT_SYMBOL(hdlc_ioctl
);
323 EXPORT_SYMBOL(alloc_hdlcdev
);
324 EXPORT_SYMBOL(register_hdlc_device
);
325 EXPORT_SYMBOL(unregister_hdlc_device
);
327 static struct packet_type hdlc_packet_type
= {
328 .type
= __constant_htons(ETH_P_HDLC
),
333 static int __init
hdlc_module_init(void)
335 printk(KERN_INFO
"%s\n", version
);
336 dev_add_pack(&hdlc_packet_type
);
342 static void __exit
hdlc_module_exit(void)
344 dev_remove_pack(&hdlc_packet_type
);
348 module_init(hdlc_module_init
);
349 module_exit(hdlc_module_exit
);