Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * G8BPQ compatible "AX.25 via ethernet" driver release 004 |
| 3 | * |
| 4 | * This code REQUIRES 2.0.0 or higher/ NET3.029 |
| 5 | * |
| 6 | * This module: |
| 7 | * This module is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This is a "pseudo" network driver to allow AX.25 over Ethernet |
| 13 | * using G8BPQ encapsulation. It has been extracted from the protocol |
| 14 | * implementation because |
| 15 | * |
| 16 | * - things got unreadable within the protocol stack |
| 17 | * - to cure the protocol stack from "feature-ism" |
| 18 | * - a protocol implementation shouldn't need to know on |
| 19 | * which hardware it is running |
| 20 | * - user-level programs like the AX.25 utilities shouldn't |
| 21 | * need to know about the hardware. |
| 22 | * - IP over ethernet encapsulated AX.25 was impossible |
| 23 | * - rxecho.c did not work |
| 24 | * - to have room for extensions |
| 25 | * - it just deserves to "live" as an own driver |
| 26 | * |
| 27 | * This driver can use any ethernet destination address, and can be |
| 28 | * limited to accept frames from one dedicated ethernet card only. |
| 29 | * |
| 30 | * Note that the driver sets up the BPQ devices automagically on |
| 31 | * startup or (if started before the "insmod" of an ethernet device) |
| 32 | * on "ifconfig up". It hopefully will remove the BPQ on "rmmod"ing |
| 33 | * the ethernet device (in fact: as soon as another ethernet or bpq |
| 34 | * device gets "ifconfig"ured). |
| 35 | * |
| 36 | * I have heard that several people are thinking of experiments |
| 37 | * with highspeed packet radio using existing ethernet cards. |
| 38 | * Well, this driver is prepared for this purpose, just add |
| 39 | * your tx key control and a txdelay / tailtime algorithm, |
| 40 | * probably some buffering, and /voila/... |
| 41 | * |
| 42 | * History |
| 43 | * BPQ 001 Joerg(DL1BKE) Extracted BPQ code from AX.25 |
| 44 | * protocol stack and added my own |
| 45 | * yet existing patches |
| 46 | * BPQ 002 Joerg(DL1BKE) Scan network device list on |
| 47 | * startup. |
| 48 | * BPQ 003 Joerg(DL1BKE) Ethernet destination address |
| 49 | * and accepted source address |
| 50 | * can be configured by an ioctl() |
| 51 | * call. |
| 52 | * Fixed to match Linux networking |
| 53 | * changes - 2.1.15. |
| 54 | * BPQ 004 Joerg(DL1BKE) Fixed to not lock up on ifconfig. |
| 55 | */ |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <linux/errno.h> |
| 58 | #include <linux/types.h> |
| 59 | #include <linux/socket.h> |
| 60 | #include <linux/in.h> |
| 61 | #include <linux/kernel.h> |
| 62 | #include <linux/string.h> |
| 63 | #include <linux/net.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 64 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <net/ax25.h> |
| 66 | #include <linux/inet.h> |
| 67 | #include <linux/netdevice.h> |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 68 | #include <linux/etherdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <linux/if_arp.h> |
| 70 | #include <linux/skbuff.h> |
| 71 | #include <net/sock.h> |
| 72 | #include <asm/system.h> |
| 73 | #include <asm/uaccess.h> |
| 74 | #include <linux/mm.h> |
| 75 | #include <linux/interrupt.h> |
| 76 | #include <linux/notifier.h> |
| 77 | #include <linux/proc_fs.h> |
| 78 | #include <linux/seq_file.h> |
| 79 | #include <linux/stat.h> |
| 80 | #include <linux/netfilter.h> |
| 81 | #include <linux/module.h> |
| 82 | #include <linux/init.h> |
| 83 | #include <linux/rtnetlink.h> |
| 84 | |
| 85 | #include <net/ip.h> |
| 86 | #include <net/arp.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 87 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | #include <linux/bpqether.h> |
| 90 | |
Hannes Eder | eb33ae2 | 2009-02-14 11:33:21 +0000 | [diff] [blame] | 91 | static const char banner[] __initdata = KERN_INFO \ |
| 92 | "AX.25: bpqether driver version 004\n"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; |
| 95 | |
| 96 | static char bpq_eth_addr[6]; |
| 97 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 98 | static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | static int bpq_device_event(struct notifier_block *, unsigned long, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Stephen Hemminger | 7546dd9 | 2009-03-09 08:18:29 +0000 | [diff] [blame] | 101 | static struct packet_type bpq_packet_type __read_mostly = { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 102 | .type = cpu_to_be16(ETH_P_BPQ), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | .func = bpq_rcv, |
| 104 | }; |
| 105 | |
| 106 | static struct notifier_block bpq_dev_notifier = { |
| 107 | .notifier_call =bpq_device_event, |
| 108 | }; |
| 109 | |
| 110 | |
| 111 | struct bpqdev { |
| 112 | struct list_head bpq_list; /* list of bpq devices chain */ |
| 113 | struct net_device *ethdev; /* link to ethernet device */ |
| 114 | struct net_device *axdev; /* bpq device (bpq#) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | char dest_addr[6]; /* ether destination address */ |
| 116 | char acpt_addr[6]; /* accept ether frames from this address only */ |
| 117 | }; |
| 118 | |
| 119 | static LIST_HEAD(bpq_devices); |
| 120 | |
Ralf Baechle | 1eeb7e4 | 2006-07-10 11:24:46 -0700 | [diff] [blame] | 121 | /* |
| 122 | * bpqether network devices are paired with ethernet devices below them, so |
| 123 | * form a special "super class" of normal ethernet devices; split their locks |
| 124 | * off into a separate class since they always nest. |
| 125 | */ |
| 126 | static struct lock_class_key bpq_netdev_xmit_lock_key; |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 127 | static struct lock_class_key bpq_netdev_addr_lock_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 129 | static void bpq_set_lockdep_class_one(struct net_device *dev, |
| 130 | struct netdev_queue *txq, |
| 131 | void *_unused) |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 132 | { |
| 133 | lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key); |
| 134 | } |
| 135 | |
| 136 | static void bpq_set_lockdep_class(struct net_device *dev) |
| 137 | { |
David S. Miller | cf508b1 | 2008-07-22 14:16:42 -0700 | [diff] [blame] | 138 | lockdep_set_class(&dev->addr_list_lock, &bpq_netdev_addr_lock_key); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 139 | netdev_for_each_tx_queue(dev, bpq_set_lockdep_class_one, NULL); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | /* ------------------------------------------------------------------------ */ |
| 143 | |
| 144 | |
| 145 | /* |
| 146 | * Get the ethernet device for a BPQ device |
| 147 | */ |
| 148 | static inline struct net_device *bpq_get_ether_dev(struct net_device *dev) |
| 149 | { |
| 150 | struct bpqdev *bpq = netdev_priv(dev); |
| 151 | |
| 152 | return bpq ? bpq->ethdev : NULL; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * Get the BPQ device for the ethernet device |
| 157 | */ |
| 158 | static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev) |
| 159 | { |
| 160 | struct bpqdev *bpq; |
| 161 | |
Ralf Baechle | bc0a743 | 2005-10-17 12:42:32 +0100 | [diff] [blame] | 162 | list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | if (bpq->ethdev == dev) |
| 164 | return bpq->axdev; |
| 165 | } |
| 166 | return NULL; |
| 167 | } |
| 168 | |
| 169 | static inline int dev_is_ethdev(struct net_device *dev) |
| 170 | { |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 171 | return (dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | /* ------------------------------------------------------------------------ */ |
| 175 | |
| 176 | |
| 177 | /* |
| 178 | * Receive an AX.25 frame via an ethernet interface. |
| 179 | */ |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 180 | static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
| 182 | int len; |
| 183 | char * ptr; |
| 184 | struct ethhdr *eth; |
| 185 | struct bpqdev *bpq; |
| 186 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 187 | if (!net_eq(dev_net(dev), &init_net)) |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 188 | goto drop; |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 191 | return NET_RX_DROP; |
| 192 | |
| 193 | if (!pskb_may_pull(skb, sizeof(struct ethhdr))) |
| 194 | goto drop; |
| 195 | |
| 196 | rcu_read_lock(); |
| 197 | dev = bpq_get_ax25_dev(dev); |
| 198 | |
| 199 | if (dev == NULL || !netif_running(dev)) |
| 200 | goto drop_unlock; |
| 201 | |
| 202 | /* |
| 203 | * if we want to accept frames from just one ethernet device |
| 204 | * we check the source address of the sender. |
| 205 | */ |
| 206 | |
| 207 | bpq = netdev_priv(dev); |
| 208 | |
| 209 | eth = eth_hdr(skb); |
| 210 | |
| 211 | if (!(bpq->acpt_addr[0] & 0x01) && |
| 212 | memcmp(eth->h_source, bpq->acpt_addr, ETH_ALEN)) |
| 213 | goto drop_unlock; |
| 214 | |
| 215 | if (skb_cow(skb, sizeof(struct ethhdr))) |
| 216 | goto drop_unlock; |
| 217 | |
| 218 | len = skb->data[0] + skb->data[1] * 256 - 5; |
| 219 | |
| 220 | skb_pull(skb, 2); /* Remove the length bytes */ |
| 221 | skb_trim(skb, len); /* Set the length of the data */ |
| 222 | |
Stephen Hemminger | f57505f | 2009-01-09 13:01:31 +0000 | [diff] [blame] | 223 | dev->stats.rx_packets++; |
| 224 | dev->stats.rx_bytes += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | ptr = skb_push(skb, 1); |
| 227 | *ptr = 0; |
| 228 | |
Arnaldo Carvalho de Melo | 56cb515 | 2005-04-24 18:53:06 -0700 | [diff] [blame] | 229 | skb->protocol = ax25_type_trans(skb, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | unlock: |
| 232 | |
| 233 | rcu_read_unlock(); |
| 234 | |
| 235 | return 0; |
| 236 | drop_unlock: |
| 237 | kfree_skb(skb); |
| 238 | goto unlock; |
| 239 | |
| 240 | drop: |
| 241 | kfree_skb(skb); |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Send an AX.25 frame via an ethernet interface |
| 247 | */ |
Stephen Hemminger | 36e4d64 | 2009-08-31 19:50:43 +0000 | [diff] [blame] | 248 | static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | unsigned char *ptr; |
| 251 | struct bpqdev *bpq; |
Dan Carpenter | f65d1f0 | 2009-12-28 06:54:55 +0000 | [diff] [blame] | 252 | struct net_device *orig_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | int size; |
| 254 | |
| 255 | /* |
| 256 | * Just to be *really* sure not to send anything if the interface |
| 257 | * is down, the ethernet device may have gone. |
| 258 | */ |
| 259 | if (!netif_running(dev)) { |
| 260 | kfree_skb(skb); |
Patrick McHardy | d77eeb7 | 2009-06-15 23:33:24 +0000 | [diff] [blame] | 261 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Ralf Baechle | 3eb0027 | 2009-09-02 23:09:29 -0700 | [diff] [blame] | 264 | skb_pull(skb, 1); /* Drop KISS byte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | size = skb->len; |
| 266 | |
| 267 | /* |
Ralf Baechle | 3eb0027 | 2009-09-02 23:09:29 -0700 | [diff] [blame] | 268 | * We're about to mess with the skb which may still shared with the |
| 269 | * generic networking code so unshare and ensure it's got enough |
| 270 | * space for the BPQ headers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | */ |
Ralf Baechle | 3eb0027 | 2009-09-02 23:09:29 -0700 | [diff] [blame] | 272 | if (skb_cow(skb, AX25_BPQ_HEADER_LEN)) { |
| 273 | if (net_ratelimit()) |
| 274 | pr_err("bpqether: out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | kfree_skb(skb); |
Ralf Baechle | 3eb0027 | 2009-09-02 23:09:29 -0700 | [diff] [blame] | 276 | |
| 277 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
Ralf Baechle | 3eb0027 | 2009-09-02 23:09:29 -0700 | [diff] [blame] | 280 | ptr = skb_push(skb, 2); /* Make space for length */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | *ptr++ = (size + 5) % 256; |
| 283 | *ptr++ = (size + 5) / 256; |
| 284 | |
| 285 | bpq = netdev_priv(dev); |
| 286 | |
Dan Carpenter | f65d1f0 | 2009-12-28 06:54:55 +0000 | [diff] [blame] | 287 | orig_dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if ((dev = bpq_get_ether_dev(dev)) == NULL) { |
Dan Carpenter | f65d1f0 | 2009-12-28 06:54:55 +0000 | [diff] [blame] | 289 | orig_dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | kfree_skb(skb); |
Patrick McHardy | 98ca4a4 | 2009-06-12 05:20:01 +0000 | [diff] [blame] | 291 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
Arnaldo Carvalho de Melo | 56cb515 | 2005-04-24 18:53:06 -0700 | [diff] [blame] | 294 | skb->protocol = ax25_type_trans(skb, dev); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 295 | skb_reset_network_header(skb); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 296 | dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0); |
Stephen Hemminger | f57505f | 2009-01-09 13:01:31 +0000 | [diff] [blame] | 297 | dev->stats.tx_packets++; |
| 298 | dev->stats.tx_bytes+=skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | dev_queue_xmit(skb); |
| 301 | netif_wake_queue(dev); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 302 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | * Set AX.25 callsign |
| 307 | */ |
| 308 | static int bpq_set_mac_address(struct net_device *dev, void *addr) |
| 309 | { |
| 310 | struct sockaddr *sa = (struct sockaddr *)addr; |
| 311 | |
| 312 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /* Ioctl commands |
| 318 | * |
| 319 | * SIOCSBPQETHOPT reserved for enhancements |
| 320 | * SIOCSBPQETHADDR set the destination and accepted |
| 321 | * source ethernet address (broadcast |
| 322 | * or multicast: accept all) |
| 323 | */ |
| 324 | static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 325 | { |
| 326 | struct bpq_ethaddr __user *ethaddr = ifr->ifr_data; |
| 327 | struct bpqdev *bpq = netdev_priv(dev); |
| 328 | struct bpq_req req; |
| 329 | |
| 330 | if (!capable(CAP_NET_ADMIN)) |
| 331 | return -EPERM; |
| 332 | |
| 333 | switch (cmd) { |
| 334 | case SIOCSBPQETHOPT: |
| 335 | if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req))) |
| 336 | return -EFAULT; |
| 337 | switch (req.cmd) { |
| 338 | case SIOCGBPQETHPARAM: |
| 339 | case SIOCSBPQETHPARAM: |
| 340 | default: |
| 341 | return -EINVAL; |
| 342 | } |
| 343 | |
| 344 | break; |
| 345 | |
| 346 | case SIOCSBPQETHADDR: |
| 347 | if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN)) |
| 348 | return -EFAULT; |
| 349 | if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN)) |
| 350 | return -EFAULT; |
| 351 | break; |
| 352 | |
| 353 | default: |
| 354 | return -EINVAL; |
| 355 | } |
| 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * open/close a device |
| 362 | */ |
| 363 | static int bpq_open(struct net_device *dev) |
| 364 | { |
| 365 | netif_start_queue(dev); |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | static int bpq_close(struct net_device *dev) |
| 370 | { |
| 371 | netif_stop_queue(dev); |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | |
| 376 | /* ------------------------------------------------------------------------ */ |
| 377 | |
| 378 | |
| 379 | /* |
| 380 | * Proc filesystem |
| 381 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | static void *bpq_seq_start(struct seq_file *seq, loff_t *pos) |
Hannes Eder | e334f56 | 2009-02-14 11:34:52 +0000 | [diff] [blame] | 383 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
| 385 | int i = 1; |
| 386 | struct bpqdev *bpqdev; |
| 387 | |
| 388 | rcu_read_lock(); |
| 389 | |
| 390 | if (*pos == 0) |
| 391 | return SEQ_START_TOKEN; |
| 392 | |
Ralf Baechle | bc0a743 | 2005-10-17 12:42:32 +0100 | [diff] [blame] | 393 | list_for_each_entry_rcu(bpqdev, &bpq_devices, bpq_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (i == *pos) |
| 395 | return bpqdev; |
| 396 | } |
| 397 | return NULL; |
| 398 | } |
| 399 | |
| 400 | static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 401 | { |
| 402 | struct list_head *p; |
| 403 | |
| 404 | ++*pos; |
| 405 | |
| 406 | if (v == SEQ_START_TOKEN) |
Paul E. McKenney | b34bd06 | 2007-07-31 00:38:48 -0700 | [diff] [blame] | 407 | p = rcu_dereference(bpq_devices.next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | else |
Paul E. McKenney | b34bd06 | 2007-07-31 00:38:48 -0700 | [diff] [blame] | 409 | p = rcu_dereference(((struct bpqdev *)v)->bpq_list.next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | return (p == &bpq_devices) ? NULL |
Paul E. McKenney | b34bd06 | 2007-07-31 00:38:48 -0700 | [diff] [blame] | 412 | : list_entry(p, struct bpqdev, bpq_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | static void bpq_seq_stop(struct seq_file *seq, void *v) |
Hannes Eder | e334f56 | 2009-02-14 11:34:52 +0000 | [diff] [blame] | 416 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | { |
| 418 | rcu_read_unlock(); |
| 419 | } |
| 420 | |
| 421 | |
| 422 | static int bpq_seq_show(struct seq_file *seq, void *v) |
| 423 | { |
| 424 | if (v == SEQ_START_TOKEN) |
| 425 | seq_puts(seq, |
| 426 | "dev ether destination accept from\n"); |
| 427 | else { |
| 428 | const struct bpqdev *bpqdev = v; |
| 429 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 430 | seq_printf(seq, "%-5s %-10s %pM ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | bpqdev->axdev->name, bpqdev->ethdev->name, |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 432 | bpqdev->dest_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 434 | if (is_multicast_ether_addr(bpqdev->acpt_addr)) |
| 435 | seq_printf(seq, "*\n"); |
| 436 | else |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 437 | seq_printf(seq, "%pM\n", bpqdev->acpt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | } |
| 440 | return 0; |
| 441 | } |
| 442 | |
Jan Engelhardt | 4101dec | 2009-01-14 13:52:18 -0800 | [diff] [blame] | 443 | static const struct seq_operations bpq_seqops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | .start = bpq_seq_start, |
| 445 | .next = bpq_seq_next, |
| 446 | .stop = bpq_seq_stop, |
| 447 | .show = bpq_seq_show, |
| 448 | }; |
| 449 | |
| 450 | static int bpq_info_open(struct inode *inode, struct file *file) |
| 451 | { |
| 452 | return seq_open(file, &bpq_seqops); |
| 453 | } |
| 454 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 455 | static const struct file_operations bpq_info_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | .owner = THIS_MODULE, |
| 457 | .open = bpq_info_open, |
| 458 | .read = seq_read, |
| 459 | .llseek = seq_lseek, |
| 460 | .release = seq_release, |
| 461 | }; |
| 462 | |
| 463 | |
| 464 | /* ------------------------------------------------------------------------ */ |
| 465 | |
Stephen Hemminger | 283767e | 2009-01-09 13:01:32 +0000 | [diff] [blame] | 466 | static const struct net_device_ops bpq_netdev_ops = { |
| 467 | .ndo_open = bpq_open, |
| 468 | .ndo_stop = bpq_close, |
| 469 | .ndo_start_xmit = bpq_xmit, |
| 470 | .ndo_set_mac_address = bpq_set_mac_address, |
| 471 | .ndo_do_ioctl = bpq_ioctl, |
| 472 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | static void bpq_setup(struct net_device *dev) |
| 475 | { |
Stephen Hemminger | 283767e | 2009-01-09 13:01:32 +0000 | [diff] [blame] | 476 | dev->netdev_ops = &bpq_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | dev->destructor = free_netdev; |
| 478 | |
Ralf Baechle | 15b1c0e | 2006-12-07 15:47:08 -0800 | [diff] [blame] | 479 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
| 480 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | dev->flags = 0; |
| 483 | |
| 484 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 485 | dev->header_ops = &ax25_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | #endif |
| 487 | |
| 488 | dev->type = ARPHRD_AX25; |
| 489 | dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; |
| 490 | dev->mtu = AX25_DEF_PACLEN; |
| 491 | dev->addr_len = AX25_ADDR_LEN; |
| 492 | |
| 493 | } |
| 494 | |
| 495 | /* |
| 496 | * Setup a new device. |
| 497 | */ |
| 498 | static int bpq_new_device(struct net_device *edev) |
| 499 | { |
| 500 | int err; |
| 501 | struct net_device *ndev; |
| 502 | struct bpqdev *bpq; |
| 503 | |
| 504 | ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d", |
| 505 | bpq_setup); |
| 506 | if (!ndev) |
| 507 | return -ENOMEM; |
| 508 | |
| 509 | |
| 510 | bpq = netdev_priv(ndev); |
| 511 | dev_hold(edev); |
| 512 | bpq->ethdev = edev; |
| 513 | bpq->axdev = ndev; |
| 514 | |
| 515 | memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr)); |
| 516 | memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr)); |
| 517 | |
| 518 | err = dev_alloc_name(ndev, ndev->name); |
| 519 | if (err < 0) |
| 520 | goto error; |
| 521 | |
| 522 | err = register_netdevice(ndev); |
| 523 | if (err) |
| 524 | goto error; |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 525 | bpq_set_lockdep_class(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | /* List protected by RTNL */ |
| 528 | list_add_rcu(&bpq->bpq_list, &bpq_devices); |
| 529 | return 0; |
| 530 | |
| 531 | error: |
| 532 | dev_put(edev); |
| 533 | free_netdev(ndev); |
| 534 | return err; |
| 535 | |
| 536 | } |
| 537 | |
| 538 | static void bpq_free_device(struct net_device *ndev) |
| 539 | { |
| 540 | struct bpqdev *bpq = netdev_priv(ndev); |
| 541 | |
| 542 | dev_put(bpq->ethdev); |
| 543 | list_del_rcu(&bpq->bpq_list); |
| 544 | |
| 545 | unregister_netdevice(ndev); |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * Handle device status changes. |
| 550 | */ |
| 551 | static int bpq_device_event(struct notifier_block *this,unsigned long event, void *ptr) |
| 552 | { |
| 553 | struct net_device *dev = (struct net_device *)ptr; |
| 554 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 555 | if (!net_eq(dev_net(dev), &init_net)) |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 556 | return NOTIFY_DONE; |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | if (!dev_is_ethdev(dev)) |
| 559 | return NOTIFY_DONE; |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | switch (event) { |
| 562 | case NETDEV_UP: /* new ethernet device -> new BPQ interface */ |
| 563 | if (bpq_get_ax25_dev(dev) == NULL) |
| 564 | bpq_new_device(dev); |
| 565 | break; |
| 566 | |
| 567 | case NETDEV_DOWN: /* ethernet device closed -> close BPQ interface */ |
| 568 | if ((dev = bpq_get_ax25_dev(dev)) != NULL) |
| 569 | dev_close(dev); |
| 570 | break; |
| 571 | |
| 572 | case NETDEV_UNREGISTER: /* ethernet device removed -> free BPQ interface */ |
| 573 | if ((dev = bpq_get_ax25_dev(dev)) != NULL) |
| 574 | bpq_free_device(dev); |
| 575 | break; |
| 576 | default: |
| 577 | break; |
| 578 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | return NOTIFY_DONE; |
| 581 | } |
| 582 | |
| 583 | |
| 584 | /* ------------------------------------------------------------------------ */ |
| 585 | |
| 586 | /* |
| 587 | * Initialize driver. To be called from af_ax25 if not compiled as a |
| 588 | * module |
| 589 | */ |
| 590 | static int __init bpq_init_driver(void) |
| 591 | { |
| 592 | #ifdef CONFIG_PROC_FS |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 593 | if (!proc_net_fops_create(&init_net, "bpqether", S_IRUGO, &bpq_info_fops)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | printk(KERN_ERR |
| 595 | "bpq: cannot create /proc/net/bpqether entry.\n"); |
| 596 | return -ENOENT; |
| 597 | } |
| 598 | #endif /* CONFIG_PROC_FS */ |
| 599 | |
| 600 | dev_add_pack(&bpq_packet_type); |
| 601 | |
| 602 | register_netdevice_notifier(&bpq_dev_notifier); |
| 603 | |
| 604 | printk(banner); |
| 605 | |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | static void __exit bpq_cleanup_driver(void) |
| 610 | { |
| 611 | struct bpqdev *bpq; |
| 612 | |
| 613 | dev_remove_pack(&bpq_packet_type); |
| 614 | |
| 615 | unregister_netdevice_notifier(&bpq_dev_notifier); |
| 616 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 617 | proc_net_remove(&init_net, "bpqether"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | rtnl_lock(); |
| 620 | while (!list_empty(&bpq_devices)) { |
| 621 | bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list); |
| 622 | bpq_free_device(bpq->axdev); |
| 623 | } |
| 624 | rtnl_unlock(); |
| 625 | } |
| 626 | |
| 627 | MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>"); |
| 628 | MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet"); |
| 629 | MODULE_LICENSE("GPL"); |
| 630 | module_init(bpq_init_driver); |
| 631 | module_exit(bpq_cleanup_driver); |