Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 4 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 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. |
| 9 | * |
| 10 | * Currently supported: |
| 11 | * * raw IP-in-HDLC |
| 12 | * * Cisco HDLC |
| 13 | * * Frame Relay with ANSI or CCITT LMI (both user and network side) |
| 14 | * * PPP |
| 15 | * * X.25 |
| 16 | * |
| 17 | * Use sethdlc utility to set line parameters, protocol and PVCs |
| 18 | * |
| 19 | * How does it work: |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 20 | * - proto->open(), close(), start(), stop() calls are serialized. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * The order is: open, [ start, stop ... ] close ... |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 22 | * - proto->start() and stop() are called with spin_lock_irq held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/poll.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/if_arp.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/pkt_sched.h> |
| 34 | #include <linux/inetdevice.h> |
| 35 | #include <linux/lapb.h> |
| 36 | #include <linux/rtnetlink.h> |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 37 | #include <linux/notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/hdlc.h> |
| 39 | |
| 40 | |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame^] | 41 | static const char* version = "HDLC support module revision 1.21"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #undef DEBUG_LINK |
| 44 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 45 | static struct hdlc_proto *first_proto = NULL; |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | static int hdlc_change_mtu(struct net_device *dev, int new_mtu) |
| 49 | { |
| 50 | if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU)) |
| 51 | return -EINVAL; |
| 52 | dev->mtu = new_mtu; |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | |
| 57 | |
| 58 | static struct net_device_stats *hdlc_get_stats(struct net_device *dev) |
| 59 | { |
| 60 | return hdlc_stats(dev); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | |
| 65 | static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 66 | struct packet_type *p, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 68 | struct hdlc_device_desc *desc = dev_to_desc(dev); |
| 69 | if (desc->netif_rx) |
| 70 | return desc->netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 72 | desc->stats.rx_dropped++; /* Shouldn't happen */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | dev_kfree_skb(skb); |
| 74 | return NET_RX_DROP; |
| 75 | } |
| 76 | |
| 77 | |
| 78 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 79 | static inline void hdlc_proto_start(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
| 81 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 82 | if (hdlc->proto->start) |
| 83 | return hdlc->proto->start(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | |
| 87 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 88 | static inline void hdlc_proto_stop(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 91 | if (hdlc->proto->stop) |
| 92 | return hdlc->proto->stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | |
| 96 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 97 | static int hdlc_device_event(struct notifier_block *this, unsigned long event, |
| 98 | void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 100 | struct net_device *dev = ptr; |
| 101 | hdlc_device *hdlc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | unsigned long flags; |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 103 | int on; |
| 104 | |
| 105 | if (dev->get_stats != hdlc_get_stats) |
| 106 | return NOTIFY_DONE; /* not an HDLC device */ |
| 107 | |
| 108 | if (event != NETDEV_CHANGE) |
| 109 | return NOTIFY_DONE; /* Only interrested in carrier changes */ |
| 110 | |
| 111 | on = netif_carrier_ok(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | #ifdef DEBUG_LINK |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 114 | printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n", |
| 115 | dev->name, on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #endif |
| 117 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 118 | hdlc = dev_to_hdlc(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | spin_lock_irqsave(&hdlc->state_lock, flags); |
| 120 | |
| 121 | if (hdlc->carrier == on) |
| 122 | goto carrier_exit; /* no change in DCD line level */ |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | hdlc->carrier = on; |
| 125 | |
| 126 | if (!hdlc->open) |
| 127 | goto carrier_exit; |
| 128 | |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 129 | if (hdlc->carrier) { |
| 130 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 131 | hdlc_proto_start(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 132 | } else { |
| 133 | printk(KERN_INFO "%s: Carrier lost\n", dev->name); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 134 | hdlc_proto_stop(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 135 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | carrier_exit: |
| 138 | spin_unlock_irqrestore(&hdlc->state_lock, flags); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 139 | return NOTIFY_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | |
| 143 | |
| 144 | /* Must be called by hardware driver when HDLC device is being opened */ |
| 145 | int hdlc_open(struct net_device *dev) |
| 146 | { |
| 147 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 148 | #ifdef DEBUG_LINK |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 149 | printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | hdlc->carrier, hdlc->open); |
| 151 | #endif |
| 152 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 153 | if (hdlc->proto == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | return -ENOSYS; /* no protocol attached */ |
| 155 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 156 | if (hdlc->proto->open) { |
| 157 | int result = hdlc->proto->open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | if (result) |
| 159 | return result; |
| 160 | } |
| 161 | |
| 162 | spin_lock_irq(&hdlc->state_lock); |
| 163 | |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 164 | if (hdlc->carrier) { |
| 165 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 166 | hdlc_proto_start(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 167 | } else |
| 168 | printk(KERN_INFO "%s: No carrier\n", dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | hdlc->open = 1; |
| 171 | |
| 172 | spin_unlock_irq(&hdlc->state_lock); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | |
| 177 | |
| 178 | /* Must be called by hardware driver when HDLC device is being closed */ |
| 179 | void hdlc_close(struct net_device *dev) |
| 180 | { |
| 181 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 182 | #ifdef DEBUG_LINK |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 183 | printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | hdlc->carrier, hdlc->open); |
| 185 | #endif |
| 186 | |
| 187 | spin_lock_irq(&hdlc->state_lock); |
| 188 | |
| 189 | hdlc->open = 0; |
| 190 | if (hdlc->carrier) |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 191 | hdlc_proto_stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
| 193 | spin_unlock_irq(&hdlc->state_lock); |
| 194 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 195 | if (hdlc->proto->close) |
| 196 | hdlc->proto->close(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 202 | { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 203 | struct hdlc_proto *proto = first_proto; |
| 204 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | if (cmd != SIOCWANDEV) |
| 207 | return -EINVAL; |
| 208 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 209 | if (dev_to_hdlc(dev)->proto) { |
| 210 | result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr); |
| 211 | if (result != -EINVAL) |
| 212 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 215 | /* Not handled by currently attached protocol (if any) */ |
| 216 | |
| 217 | while (proto) { |
| 218 | if ((result = proto->ioctl(dev, ifr)) != -EINVAL) |
| 219 | return result; |
| 220 | proto = proto->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 222 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame^] | 225 | static void hdlc_setup_dev(struct net_device *dev) |
| 226 | { |
| 227 | /* Re-init all variables changed by HDLC protocol drivers, |
| 228 | * including ether_setup() called from hdlc_raw_eth.c. |
| 229 | */ |
| 230 | dev->get_stats = hdlc_get_stats; |
| 231 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| 232 | dev->mtu = HDLC_MAX_MTU; |
| 233 | dev->type = ARPHRD_RAWHDLC; |
| 234 | dev->hard_header_len = 16; |
| 235 | dev->addr_len = 0; |
| 236 | dev->hard_header = NULL; |
| 237 | dev->rebuild_header = NULL; |
| 238 | dev->set_mac_address = NULL; |
| 239 | dev->hard_header_cache = NULL; |
| 240 | dev->header_cache_update = NULL; |
| 241 | dev->change_mtu = hdlc_change_mtu; |
| 242 | dev->hard_header_parse = NULL; |
| 243 | } |
| 244 | |
Adrian Bunk | 0bf94fa | 2007-01-11 14:48:59 +0100 | [diff] [blame] | 245 | static void hdlc_setup(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
| 247 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 248 | |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame^] | 249 | hdlc_setup_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | hdlc->carrier = 1; |
| 251 | hdlc->open = 0; |
| 252 | spin_lock_init(&hdlc->state_lock); |
| 253 | } |
| 254 | |
| 255 | struct net_device *alloc_hdlcdev(void *priv) |
| 256 | { |
| 257 | struct net_device *dev; |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 258 | dev = alloc_netdev(sizeof(struct hdlc_device_desc) + |
| 259 | sizeof(hdlc_device), "hdlc%d", hdlc_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | if (dev) |
| 261 | dev_to_hdlc(dev)->priv = priv; |
| 262 | return dev; |
| 263 | } |
| 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | void unregister_hdlc_device(struct net_device *dev) |
| 266 | { |
| 267 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | unregister_netdevice(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 269 | detach_hdlc_protocol(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | rtnl_unlock(); |
| 271 | } |
| 272 | |
| 273 | |
| 274 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 275 | int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, |
| 276 | int (*rx)(struct sk_buff *skb), size_t size) |
| 277 | { |
| 278 | detach_hdlc_protocol(dev); |
| 279 | |
| 280 | if (!try_module_get(proto->module)) |
| 281 | return -ENOSYS; |
| 282 | |
| 283 | if (size) |
| 284 | if ((dev_to_hdlc(dev)->state = kmalloc(size, |
| 285 | GFP_KERNEL)) == NULL) { |
| 286 | printk(KERN_WARNING "Memory squeeze on" |
| 287 | " hdlc_proto_attach()\n"); |
| 288 | module_put(proto->module); |
| 289 | return -ENOBUFS; |
| 290 | } |
| 291 | dev_to_hdlc(dev)->proto = proto; |
| 292 | dev_to_desc(dev)->netif_rx = rx; |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | |
| 297 | void detach_hdlc_protocol(struct net_device *dev) |
| 298 | { |
| 299 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 300 | |
| 301 | if (hdlc->proto) { |
| 302 | if (hdlc->proto->detach) |
| 303 | hdlc->proto->detach(dev); |
| 304 | module_put(hdlc->proto->module); |
| 305 | hdlc->proto = NULL; |
| 306 | } |
| 307 | kfree(hdlc->state); |
| 308 | hdlc->state = NULL; |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame^] | 309 | hdlc_setup_dev(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | |
| 313 | void register_hdlc_protocol(struct hdlc_proto *proto) |
| 314 | { |
| 315 | proto->next = first_proto; |
| 316 | first_proto = proto; |
| 317 | } |
| 318 | |
| 319 | |
| 320 | void unregister_hdlc_protocol(struct hdlc_proto *proto) |
| 321 | { |
| 322 | struct hdlc_proto **p = &first_proto; |
| 323 | while (*p) { |
| 324 | if (*p == proto) { |
| 325 | *p = proto->next; |
| 326 | return; |
| 327 | } |
| 328 | p = &((*p)->next); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); |
| 335 | MODULE_DESCRIPTION("HDLC support module"); |
| 336 | MODULE_LICENSE("GPL v2"); |
| 337 | |
| 338 | EXPORT_SYMBOL(hdlc_open); |
| 339 | EXPORT_SYMBOL(hdlc_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | EXPORT_SYMBOL(hdlc_ioctl); |
| 341 | EXPORT_SYMBOL(alloc_hdlcdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | EXPORT_SYMBOL(unregister_hdlc_device); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 343 | EXPORT_SYMBOL(register_hdlc_protocol); |
| 344 | EXPORT_SYMBOL(unregister_hdlc_protocol); |
| 345 | EXPORT_SYMBOL(attach_hdlc_protocol); |
| 346 | EXPORT_SYMBOL(detach_hdlc_protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | static struct packet_type hdlc_packet_type = { |
| 349 | .type = __constant_htons(ETH_P_HDLC), |
| 350 | .func = hdlc_rcv, |
| 351 | }; |
| 352 | |
| 353 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 354 | static struct notifier_block hdlc_notifier = { |
| 355 | .notifier_call = hdlc_device_event, |
| 356 | }; |
| 357 | |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | static int __init hdlc_module_init(void) |
| 360 | { |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 361 | int result; |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | printk(KERN_INFO "%s\n", version); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 364 | if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0) |
| 365 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | dev_add_pack(&hdlc_packet_type); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | |
| 371 | |
| 372 | static void __exit hdlc_module_exit(void) |
| 373 | { |
| 374 | dev_remove_pack(&hdlc_packet_type); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 375 | unregister_netdevice_notifier(&hdlc_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | |
| 379 | module_init(hdlc_module_init); |
| 380 | module_exit(hdlc_module_exit); |