Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 4 | * Copyright (C) 1999 - 2008 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 | |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/hdlc.h> |
Krzysztof Hałasa | 4dfce40 | 2008-06-30 19:06:40 +0200 | [diff] [blame] | 29 | #include <linux/if_arp.h> |
| 30 | #include <linux/inetdevice.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/notifier.h> |
| 35 | #include <linux/pkt_sched.h> |
| 36 | #include <linux/poll.h> |
| 37 | #include <linux/rtnetlink.h> |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/slab.h> |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 40 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 43 | static const char* version = "HDLC support module revision 1.22"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #undef DEBUG_LINK |
| 46 | |
Krzysztof Halasa | fa701bd | 2008-05-19 19:00:51 +0200 | [diff] [blame] | 47 | static struct hdlc_proto *first_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | 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] | 50 | struct packet_type *p, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 52 | struct hdlc_device *hdlc = dev_to_hdlc(dev); |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 53 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 54 | if (!net_eq(dev_net(dev), &init_net)) { |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 55 | kfree_skb(skb); |
| 56 | return 0; |
| 57 | } |
| 58 | |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 59 | BUG_ON(!hdlc->proto->netif_rx); |
| 60 | return hdlc->proto->netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 63 | netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev) |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 64 | { |
| 65 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 67 | if (hdlc->proto->xmit) |
| 68 | return hdlc->proto->xmit(skb, dev); |
| 69 | |
| 70 | return hdlc->xmit(skb, dev); /* call hardware driver directly */ |
| 71 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 73 | static inline void hdlc_proto_start(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 76 | if (hdlc->proto->start) |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 77 | hdlc->proto->start(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | |
| 81 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 82 | static inline void hdlc_proto_stop(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
| 84 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 85 | if (hdlc->proto->stop) |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 86 | hdlc->proto->stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | |
| 90 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 91 | static int hdlc_device_event(struct notifier_block *this, unsigned long event, |
| 92 | void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 94 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 95 | hdlc_device *hdlc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | unsigned long flags; |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 97 | int on; |
Krzysztof Hałasa | dff3fde | 2009-01-08 19:55:57 +0100 | [diff] [blame] | 98 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 99 | if (!net_eq(dev_net(dev), &init_net)) |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 100 | return NOTIFY_DONE; |
| 101 | |
Krzysztof Hałasa | 7cdc15f | 2009-01-08 19:46:54 +0100 | [diff] [blame] | 102 | if (!(dev->priv_flags & IFF_WAN_HDLC)) |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 103 | return NOTIFY_DONE; /* not an HDLC device */ |
Krzysztof Hałasa | 4dfce40 | 2008-06-30 19:06:40 +0200 | [diff] [blame] | 104 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 105 | if (event != NETDEV_CHANGE) |
Thomas Weber | 6f0b31c | 2010-09-20 16:30:54 +0200 | [diff] [blame] | 106 | return NOTIFY_DONE; /* Only interested in carrier changes */ |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 107 | |
| 108 | on = netif_carrier_ok(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | #ifdef DEBUG_LINK |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 111 | printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n", |
| 112 | dev->name, on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | #endif |
| 114 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 115 | hdlc = dev_to_hdlc(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | spin_lock_irqsave(&hdlc->state_lock, flags); |
| 117 | |
| 118 | if (hdlc->carrier == on) |
| 119 | goto carrier_exit; /* no change in DCD line level */ |
| 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | hdlc->carrier = on; |
| 122 | |
| 123 | if (!hdlc->open) |
| 124 | goto carrier_exit; |
| 125 | |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 126 | if (hdlc->carrier) { |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 127 | netdev_info(dev, "Carrier detected\n"); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 128 | hdlc_proto_start(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 129 | } else { |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 130 | netdev_info(dev, "Carrier lost\n"); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 131 | hdlc_proto_stop(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | carrier_exit: |
| 135 | spin_unlock_irqrestore(&hdlc->state_lock, flags); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 136 | return NOTIFY_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | |
| 140 | |
| 141 | /* Must be called by hardware driver when HDLC device is being opened */ |
| 142 | int hdlc_open(struct net_device *dev) |
| 143 | { |
| 144 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 145 | #ifdef DEBUG_LINK |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 146 | 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] | 147 | hdlc->carrier, hdlc->open); |
| 148 | #endif |
| 149 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 150 | if (hdlc->proto == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return -ENOSYS; /* no protocol attached */ |
| 152 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 153 | if (hdlc->proto->open) { |
| 154 | int result = hdlc->proto->open(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (result) |
| 156 | return result; |
| 157 | } |
| 158 | |
| 159 | spin_lock_irq(&hdlc->state_lock); |
| 160 | |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 161 | if (hdlc->carrier) { |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 162 | netdev_info(dev, "Carrier detected\n"); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 163 | hdlc_proto_start(dev); |
Krzysztof Halasa | b3dd65f | 2005-04-21 15:57:25 +0200 | [diff] [blame] | 164 | } else |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 165 | netdev_info(dev, "No carrier\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | hdlc->open = 1; |
| 168 | |
| 169 | spin_unlock_irq(&hdlc->state_lock); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | |
| 175 | /* Must be called by hardware driver when HDLC device is being closed */ |
| 176 | void hdlc_close(struct net_device *dev) |
| 177 | { |
| 178 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 179 | #ifdef DEBUG_LINK |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 180 | 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] | 181 | hdlc->carrier, hdlc->open); |
| 182 | #endif |
| 183 | |
| 184 | spin_lock_irq(&hdlc->state_lock); |
| 185 | |
| 186 | hdlc->open = 0; |
| 187 | if (hdlc->carrier) |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 188 | hdlc_proto_stop(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | spin_unlock_irq(&hdlc->state_lock); |
| 191 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 192 | if (hdlc->proto->close) |
| 193 | hdlc->proto->close(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | |
| 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 199 | { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 200 | struct hdlc_proto *proto = first_proto; |
| 201 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | if (cmd != SIOCWANDEV) |
| 204 | return -EINVAL; |
| 205 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 206 | if (dev_to_hdlc(dev)->proto) { |
| 207 | result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr); |
| 208 | if (result != -EINVAL) |
| 209 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 212 | /* Not handled by currently attached protocol (if any) */ |
| 213 | |
| 214 | while (proto) { |
| 215 | if ((result = proto->ioctl(dev, ifr)) != -EINVAL) |
| 216 | return result; |
| 217 | proto = proto->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 219 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 222 | static const struct header_ops hdlc_null_ops; |
| 223 | |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 224 | static void hdlc_setup_dev(struct net_device *dev) |
| 225 | { |
| 226 | /* Re-init all variables changed by HDLC protocol drivers, |
| 227 | * including ether_setup() called from hdlc_raw_eth.c. |
| 228 | */ |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 229 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
Krzysztof Hałasa | 7cdc15f | 2009-01-08 19:46:54 +0100 | [diff] [blame] | 230 | dev->priv_flags = IFF_WAN_HDLC; |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 231 | dev->mtu = HDLC_MAX_MTU; |
Jarod Wilson | 8b6b413 | 2016-10-20 13:55:19 -0400 | [diff] [blame] | 232 | dev->min_mtu = 68; |
| 233 | dev->max_mtu = HDLC_MAX_MTU; |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 234 | dev->type = ARPHRD_RAWHDLC; |
| 235 | dev->hard_header_len = 16; |
| 236 | dev->addr_len = 0; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 237 | dev->header_ops = &hdlc_null_ops; |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 238 | } |
| 239 | |
Adrian Bunk | 0bf94fa | 2007-01-11 14:48:59 +0100 | [diff] [blame] | 240 | static void hdlc_setup(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
| 242 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 243 | |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 244 | hdlc_setup_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | hdlc->carrier = 1; |
| 246 | hdlc->open = 0; |
| 247 | spin_lock_init(&hdlc->state_lock); |
| 248 | } |
| 249 | |
| 250 | struct net_device *alloc_hdlcdev(void *priv) |
| 251 | { |
| 252 | struct net_device *dev; |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 253 | dev = alloc_netdev(sizeof(struct hdlc_device), "hdlc%d", |
| 254 | NET_NAME_UNKNOWN, hdlc_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (dev) |
| 256 | dev_to_hdlc(dev)->priv = priv; |
| 257 | return dev; |
| 258 | } |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | void unregister_hdlc_device(struct net_device *dev) |
| 261 | { |
| 262 | rtnl_lock(); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 263 | detach_hdlc_protocol(dev); |
Andrew Lunn | ff351644 | 2015-12-03 21:12:30 +0100 | [diff] [blame] | 264 | unregister_netdevice(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | rtnl_unlock(); |
| 266 | } |
| 267 | |
| 268 | |
| 269 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 270 | int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 271 | size_t size) |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 272 | { |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 273 | int err; |
| 274 | |
| 275 | err = detach_hdlc_protocol(dev); |
| 276 | if (err) |
| 277 | return err; |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 278 | |
| 279 | if (!try_module_get(proto->module)) |
| 280 | return -ENOSYS; |
| 281 | |
Joe Perches | 1d5d1fd | 2013-02-03 17:28:12 +0000 | [diff] [blame] | 282 | if (size) { |
| 283 | dev_to_hdlc(dev)->state = kmalloc(size, GFP_KERNEL); |
| 284 | if (dev_to_hdlc(dev)->state == NULL) { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 285 | module_put(proto->module); |
| 286 | return -ENOBUFS; |
| 287 | } |
Joe Perches | 1d5d1fd | 2013-02-03 17:28:12 +0000 | [diff] [blame] | 288 | } |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 289 | dev_to_hdlc(dev)->proto = proto; |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 290 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 295 | int detach_hdlc_protocol(struct net_device *dev) |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 296 | { |
| 297 | hdlc_device *hdlc = dev_to_hdlc(dev); |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 298 | int err; |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 299 | |
| 300 | if (hdlc->proto) { |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 301 | err = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev); |
| 302 | err = notifier_to_errno(err); |
| 303 | if (err) { |
| 304 | netdev_err(dev, "Refused to change device type\n"); |
| 305 | return err; |
| 306 | } |
| 307 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 308 | if (hdlc->proto->detach) |
| 309 | hdlc->proto->detach(dev); |
| 310 | module_put(hdlc->proto->module); |
| 311 | hdlc->proto = NULL; |
| 312 | } |
| 313 | kfree(hdlc->state); |
| 314 | hdlc->state = NULL; |
Krzysztof Halasa | b5284e5 | 2007-03-02 15:52:22 -0800 | [diff] [blame] | 315 | hdlc_setup_dev(dev); |
Andrew Lunn | 2f8364a | 2015-12-03 21:12:31 +0100 | [diff] [blame] | 316 | |
| 317 | return 0; |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | |
| 321 | void register_hdlc_protocol(struct hdlc_proto *proto) |
| 322 | { |
Krzysztof Halasa | fa701bd | 2008-05-19 19:00:51 +0200 | [diff] [blame] | 323 | rtnl_lock(); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 324 | proto->next = first_proto; |
| 325 | first_proto = proto; |
Krzysztof Halasa | fa701bd | 2008-05-19 19:00:51 +0200 | [diff] [blame] | 326 | rtnl_unlock(); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | |
| 330 | void unregister_hdlc_protocol(struct hdlc_proto *proto) |
| 331 | { |
Krzysztof Halasa | fa701bd | 2008-05-19 19:00:51 +0200 | [diff] [blame] | 332 | struct hdlc_proto **p; |
| 333 | |
| 334 | rtnl_lock(); |
| 335 | p = &first_proto; |
| 336 | while (*p != proto) { |
| 337 | BUG_ON(!*p); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 338 | p = &((*p)->next); |
| 339 | } |
Krzysztof Halasa | fa701bd | 2008-05-19 19:00:51 +0200 | [diff] [blame] | 340 | *p = proto->next; |
| 341 | rtnl_unlock(); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); |
| 347 | MODULE_DESCRIPTION("HDLC support module"); |
| 348 | MODULE_LICENSE("GPL v2"); |
| 349 | |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 350 | EXPORT_SYMBOL(hdlc_start_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | EXPORT_SYMBOL(hdlc_open); |
| 352 | EXPORT_SYMBOL(hdlc_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | EXPORT_SYMBOL(hdlc_ioctl); |
| 354 | EXPORT_SYMBOL(alloc_hdlcdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | EXPORT_SYMBOL(unregister_hdlc_device); |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 356 | EXPORT_SYMBOL(register_hdlc_protocol); |
| 357 | EXPORT_SYMBOL(unregister_hdlc_protocol); |
| 358 | EXPORT_SYMBOL(attach_hdlc_protocol); |
| 359 | EXPORT_SYMBOL(detach_hdlc_protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Stephen Hemminger | 7546dd9 | 2009-03-09 08:18:29 +0000 | [diff] [blame] | 361 | static struct packet_type hdlc_packet_type __read_mostly = { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 362 | .type = cpu_to_be16(ETH_P_HDLC), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | .func = hdlc_rcv, |
| 364 | }; |
| 365 | |
| 366 | |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 367 | static struct notifier_block hdlc_notifier = { |
Krzysztof Hałasa | 4dfce40 | 2008-06-30 19:06:40 +0200 | [diff] [blame] | 368 | .notifier_call = hdlc_device_event, |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 369 | }; |
| 370 | |
| 371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | static int __init hdlc_module_init(void) |
| 373 | { |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 374 | int result; |
| 375 | |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 376 | pr_info("%s\n", version); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 377 | if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0) |
Krzysztof Hałasa | 4dfce40 | 2008-06-30 19:06:40 +0200 | [diff] [blame] | 378 | return result; |
| 379 | dev_add_pack(&hdlc_packet_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | |
| 384 | |
| 385 | static void __exit hdlc_module_exit(void) |
| 386 | { |
| 387 | dev_remove_pack(&hdlc_packet_type); |
Krzysztof Halasa | c2ce920 | 2006-07-12 13:46:12 -0700 | [diff] [blame] | 388 | unregister_netdevice_notifier(&hdlc_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | |
| 392 | module_init(hdlc_module_init); |
| 393 | module_exit(hdlc_module_exit); |