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1 | /* Copyright 2011, Siemens AG | |
2 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
3 | */ | |
4 | ||
5 | /* Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
6 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
19 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
20 | * All rights reserved. | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. Neither the name of the Institute nor the names of its contributors | |
31 | * may be used to endorse or promote products derived from this software | |
32 | * without specific prior written permission. | |
33 | * | |
34 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
35 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
36 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
37 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
38 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
39 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
40 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
41 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
42 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
43 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
44 | * SUCH DAMAGE. | |
45 | */ | |
46 | ||
47 | #include <linux/bitops.h> | |
48 | #include <linux/if_arp.h> | |
49 | #include <linux/module.h> | |
50 | #include <linux/moduleparam.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <net/af_ieee802154.h> | |
53 | #include <net/ieee802154.h> | |
54 | #include <net/ieee802154_netdev.h> | |
55 | #include <net/6lowpan.h> | |
56 | #include <net/ipv6.h> | |
57 | ||
58 | #include "reassembly.h" | |
59 | ||
60 | static LIST_HEAD(lowpan_devices); | |
61 | ||
62 | /* private device info */ | |
63 | struct lowpan_dev_info { | |
64 | struct net_device *real_dev; /* real WPAN device ptr */ | |
65 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
66 | __be16 fragment_tag; | |
67 | }; | |
68 | ||
69 | struct lowpan_dev_record { | |
70 | struct net_device *ldev; | |
71 | struct list_head list; | |
72 | }; | |
73 | ||
74 | static inline struct | |
75 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
76 | { | |
77 | return netdev_priv(dev); | |
78 | } | |
79 | ||
80 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
81 | { | |
82 | int i; | |
83 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
84 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
85 | } | |
86 | ||
87 | static int lowpan_header_create(struct sk_buff *skb, | |
88 | struct net_device *dev, | |
89 | unsigned short type, const void *_daddr, | |
90 | const void *_saddr, unsigned int len) | |
91 | { | |
92 | const u8 *saddr = _saddr; | |
93 | const u8 *daddr = _daddr; | |
94 | struct ieee802154_addr sa, da; | |
95 | ||
96 | /* TODO: | |
97 | * if this package isn't ipv6 one, where should it be routed? | |
98 | */ | |
99 | if (type != ETH_P_IPV6) | |
100 | return 0; | |
101 | ||
102 | if (!saddr) | |
103 | saddr = dev->dev_addr; | |
104 | ||
105 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
106 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
107 | ||
108 | lowpan_header_compress(skb, dev, type, daddr, saddr, len); | |
109 | ||
110 | /* NOTE1: I'm still unsure about the fact that compression and WPAN | |
111 | * header are created here and not later in the xmit. So wait for | |
112 | * an opinion of net maintainers. | |
113 | */ | |
114 | /* NOTE2: to be absolutely correct, we must derive PANid information | |
115 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
116 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
117 | */ | |
118 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; | |
119 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); | |
120 | ||
121 | /* prepare wpan address data */ | |
122 | sa.addr_type = IEEE802154_ADDR_LONG; | |
123 | sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
124 | ||
125 | memcpy(&(sa.hwaddr), saddr, 8); | |
126 | /* intra-PAN communications */ | |
127 | da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
128 | ||
129 | /* if the destination address is the broadcast address, use the | |
130 | * corresponding short address | |
131 | */ | |
132 | if (lowpan_is_addr_broadcast(daddr)) { | |
133 | da.addr_type = IEEE802154_ADDR_SHORT; | |
134 | da.short_addr = IEEE802154_ADDR_BROADCAST; | |
135 | } else { | |
136 | da.addr_type = IEEE802154_ADDR_LONG; | |
137 | memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN); | |
138 | ||
139 | /* request acknowledgment */ | |
140 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; | |
141 | } | |
142 | ||
143 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, | |
144 | type, (void *)&da, (void *)&sa, skb->len); | |
145 | } | |
146 | ||
147 | static int lowpan_give_skb_to_devices(struct sk_buff *skb, | |
148 | struct net_device *dev) | |
149 | { | |
150 | struct lowpan_dev_record *entry; | |
151 | struct sk_buff *skb_cp; | |
152 | int stat = NET_RX_SUCCESS; | |
153 | ||
154 | rcu_read_lock(); | |
155 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
156 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
157 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
158 | if (!skb_cp) { | |
159 | stat = -ENOMEM; | |
160 | break; | |
161 | } | |
162 | ||
163 | skb_cp->dev = entry->ldev; | |
164 | stat = netif_rx(skb_cp); | |
165 | } | |
166 | rcu_read_unlock(); | |
167 | ||
168 | return stat; | |
169 | } | |
170 | ||
171 | static int process_data(struct sk_buff *skb) | |
172 | { | |
173 | u8 iphc0, iphc1; | |
174 | const struct ieee802154_addr *_saddr, *_daddr; | |
175 | ||
176 | raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len); | |
177 | /* at least two bytes will be used for the encoding */ | |
178 | if (skb->len < 2) | |
179 | goto drop; | |
180 | ||
181 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
182 | goto drop; | |
183 | ||
184 | if (lowpan_fetch_skb_u8(skb, &iphc1)) | |
185 | goto drop; | |
186 | ||
187 | _saddr = &mac_cb(skb)->sa; | |
188 | _daddr = &mac_cb(skb)->da; | |
189 | ||
190 | return lowpan_process_data(skb, skb->dev, (u8 *)_saddr->hwaddr, | |
191 | _saddr->addr_type, IEEE802154_ADDR_LEN, | |
192 | (u8 *)_daddr->hwaddr, _daddr->addr_type, | |
193 | IEEE802154_ADDR_LEN, iphc0, iphc1, | |
194 | lowpan_give_skb_to_devices); | |
195 | ||
196 | drop: | |
197 | kfree_skb(skb); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | static int lowpan_set_address(struct net_device *dev, void *p) | |
202 | { | |
203 | struct sockaddr *sa = p; | |
204 | ||
205 | if (netif_running(dev)) | |
206 | return -EBUSY; | |
207 | ||
208 | /* TODO: validate addr */ | |
209 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int | |
215 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
216 | int mlen, int plen, int offset, int type) | |
217 | { | |
218 | struct sk_buff *frag; | |
219 | int hlen; | |
220 | ||
221 | hlen = (type == LOWPAN_DISPATCH_FRAG1) ? | |
222 | LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE; | |
223 | ||
224 | raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
225 | ||
226 | frag = netdev_alloc_skb(skb->dev, | |
227 | hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
228 | if (!frag) | |
229 | return -ENOMEM; | |
230 | ||
231 | frag->priority = skb->priority; | |
232 | ||
233 | /* copy header, MFR and payload */ | |
234 | skb_put(frag, mlen); | |
235 | skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen); | |
236 | ||
237 | skb_put(frag, hlen); | |
238 | skb_copy_to_linear_data_offset(frag, mlen, head, hlen); | |
239 | ||
240 | skb_put(frag, plen); | |
241 | skb_copy_to_linear_data_offset(frag, mlen + hlen, | |
242 | skb_network_header(skb) + offset, plen); | |
243 | ||
244 | raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len); | |
245 | ||
246 | return dev_queue_xmit(frag); | |
247 | } | |
248 | ||
249 | static int | |
250 | lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev) | |
251 | { | |
252 | int err; | |
253 | u16 dgram_offset, dgram_size, payload_length, header_length, | |
254 | lowpan_size, frag_plen, offset; | |
255 | __be16 tag; | |
256 | u8 head[5]; | |
257 | ||
258 | header_length = skb->mac_len; | |
259 | payload_length = skb->len - header_length; | |
260 | tag = lowpan_dev_info(dev)->fragment_tag++; | |
261 | lowpan_size = skb_network_header_len(skb); | |
262 | dgram_size = lowpan_uncompress_size(skb, &dgram_offset) - | |
263 | header_length; | |
264 | ||
265 | /* first fragment header */ | |
266 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x7); | |
267 | head[1] = dgram_size & 0xff; | |
268 | memcpy(head + 2, &tag, sizeof(tag)); | |
269 | ||
270 | /* calc the nearest payload length(divided to 8) for first fragment | |
271 | * which fits into a IEEE802154_MTU | |
272 | */ | |
273 | frag_plen = round_down(IEEE802154_MTU - header_length - | |
274 | LOWPAN_FRAG1_HEAD_SIZE - lowpan_size - | |
275 | IEEE802154_MFR_SIZE, 8); | |
276 | ||
277 | err = lowpan_fragment_xmit(skb, head, header_length, | |
278 | frag_plen + lowpan_size, 0, | |
279 | LOWPAN_DISPATCH_FRAG1); | |
280 | if (err) { | |
281 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
282 | __func__, tag); | |
283 | goto exit; | |
284 | } | |
285 | ||
286 | offset = lowpan_size + frag_plen; | |
287 | dgram_offset += frag_plen; | |
288 | ||
289 | /* next fragment header */ | |
290 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
291 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
292 | ||
293 | frag_plen = round_down(IEEE802154_MTU - header_length - | |
294 | LOWPAN_FRAGN_HEAD_SIZE - IEEE802154_MFR_SIZE, 8); | |
295 | ||
296 | while (payload_length - offset > 0) { | |
297 | int len = frag_plen; | |
298 | ||
299 | head[4] = dgram_offset >> 3; | |
300 | ||
301 | if (payload_length - offset < len) | |
302 | len = payload_length - offset; | |
303 | ||
304 | err = lowpan_fragment_xmit(skb, head, header_length, len, | |
305 | offset, LOWPAN_DISPATCH_FRAGN); | |
306 | if (err) { | |
307 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", | |
308 | __func__, tag, offset); | |
309 | goto exit; | |
310 | } | |
311 | ||
312 | offset += len; | |
313 | dgram_offset += len; | |
314 | } | |
315 | ||
316 | exit: | |
317 | return err; | |
318 | } | |
319 | ||
320 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) | |
321 | { | |
322 | int err = -1; | |
323 | ||
324 | pr_debug("package xmit\n"); | |
325 | ||
326 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
327 | if (skb->dev == NULL) { | |
328 | pr_debug("ERROR: no real wpan device found\n"); | |
329 | goto error; | |
330 | } | |
331 | ||
332 | /* Send directly if less than the MTU minus the 2 checksum bytes. */ | |
333 | if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) { | |
334 | err = dev_queue_xmit(skb); | |
335 | goto out; | |
336 | } | |
337 | ||
338 | pr_debug("frame is too big, fragmentation is needed\n"); | |
339 | err = lowpan_skb_fragmentation(skb, dev); | |
340 | error: | |
341 | dev_kfree_skb(skb); | |
342 | out: | |
343 | if (err) | |
344 | pr_debug("ERROR: xmit failed\n"); | |
345 | ||
346 | return (err < 0) ? NET_XMIT_DROP : err; | |
347 | } | |
348 | ||
349 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) | |
350 | { | |
351 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
352 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
353 | } | |
354 | ||
355 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
356 | { | |
357 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
358 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
359 | } | |
360 | ||
361 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
362 | { | |
363 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
364 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
365 | } | |
366 | ||
367 | static u8 lowpan_get_dsn(const struct net_device *dev) | |
368 | { | |
369 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
370 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); | |
371 | } | |
372 | ||
373 | static struct header_ops lowpan_header_ops = { | |
374 | .create = lowpan_header_create, | |
375 | }; | |
376 | ||
377 | static struct lock_class_key lowpan_tx_busylock; | |
378 | static struct lock_class_key lowpan_netdev_xmit_lock_key; | |
379 | ||
380 | static void lowpan_set_lockdep_class_one(struct net_device *dev, | |
381 | struct netdev_queue *txq, | |
382 | void *_unused) | |
383 | { | |
384 | lockdep_set_class(&txq->_xmit_lock, | |
385 | &lowpan_netdev_xmit_lock_key); | |
386 | } | |
387 | ||
388 | ||
389 | static int lowpan_dev_init(struct net_device *dev) | |
390 | { | |
391 | netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL); | |
392 | dev->qdisc_tx_busylock = &lowpan_tx_busylock; | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static const struct net_device_ops lowpan_netdev_ops = { | |
397 | .ndo_init = lowpan_dev_init, | |
398 | .ndo_start_xmit = lowpan_xmit, | |
399 | .ndo_set_mac_address = lowpan_set_address, | |
400 | }; | |
401 | ||
402 | static struct ieee802154_mlme_ops lowpan_mlme = { | |
403 | .get_pan_id = lowpan_get_pan_id, | |
404 | .get_phy = lowpan_get_phy, | |
405 | .get_short_addr = lowpan_get_short_addr, | |
406 | .get_dsn = lowpan_get_dsn, | |
407 | }; | |
408 | ||
409 | static void lowpan_setup(struct net_device *dev) | |
410 | { | |
411 | dev->addr_len = IEEE802154_ADDR_LEN; | |
412 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
413 | dev->type = ARPHRD_IEEE802154; | |
414 | /* Frame Control + Sequence Number + Address fields + Security Header */ | |
415 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
416 | dev->needed_tailroom = 2; /* FCS */ | |
417 | dev->mtu = 1281; | |
418 | dev->tx_queue_len = 0; | |
419 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; | |
420 | dev->watchdog_timeo = 0; | |
421 | ||
422 | dev->netdev_ops = &lowpan_netdev_ops; | |
423 | dev->header_ops = &lowpan_header_ops; | |
424 | dev->ml_priv = &lowpan_mlme; | |
425 | dev->destructor = free_netdev; | |
426 | } | |
427 | ||
428 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
429 | { | |
430 | if (tb[IFLA_ADDRESS]) { | |
431 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
432 | return -EINVAL; | |
433 | } | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
438 | struct packet_type *pt, struct net_device *orig_dev) | |
439 | { | |
440 | struct sk_buff *local_skb; | |
441 | int ret; | |
442 | ||
443 | if (!netif_running(dev)) | |
444 | goto drop_skb; | |
445 | ||
446 | if (dev->type != ARPHRD_IEEE802154) | |
447 | goto drop_skb; | |
448 | ||
449 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
450 | if (!local_skb) | |
451 | goto drop_skb; | |
452 | ||
453 | kfree_skb(skb); | |
454 | ||
455 | /* check that it's our buffer */ | |
456 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { | |
457 | local_skb->protocol = htons(ETH_P_IPV6); | |
458 | local_skb->pkt_type = PACKET_HOST; | |
459 | ||
460 | /* Pull off the 1-byte of 6lowpan header. */ | |
461 | skb_pull(local_skb, 1); | |
462 | ||
463 | ret = lowpan_give_skb_to_devices(local_skb, NULL); | |
464 | if (ret == NET_RX_DROP) | |
465 | goto drop; | |
466 | } else { | |
467 | switch (skb->data[0] & 0xe0) { | |
468 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
469 | ret = process_data(local_skb); | |
470 | if (ret == NET_RX_DROP) | |
471 | goto drop; | |
472 | break; | |
473 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
474 | ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAG1); | |
475 | if (ret == 1) { | |
476 | ret = process_data(local_skb); | |
477 | if (ret == NET_RX_DROP) | |
478 | goto drop; | |
479 | } | |
480 | break; | |
481 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
482 | ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAGN); | |
483 | if (ret == 1) { | |
484 | ret = process_data(local_skb); | |
485 | if (ret == NET_RX_DROP) | |
486 | goto drop; | |
487 | } | |
488 | break; | |
489 | default: | |
490 | break; | |
491 | } | |
492 | } | |
493 | ||
494 | return NET_RX_SUCCESS; | |
495 | drop_skb: | |
496 | kfree_skb(skb); | |
497 | drop: | |
498 | return NET_RX_DROP; | |
499 | } | |
500 | ||
501 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
502 | struct nlattr *tb[], struct nlattr *data[]) | |
503 | { | |
504 | struct net_device *real_dev; | |
505 | struct lowpan_dev_record *entry; | |
506 | ||
507 | pr_debug("adding new link\n"); | |
508 | ||
509 | if (!tb[IFLA_LINK]) | |
510 | return -EINVAL; | |
511 | /* find and hold real wpan device */ | |
512 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
513 | if (!real_dev) | |
514 | return -ENODEV; | |
515 | if (real_dev->type != ARPHRD_IEEE802154) { | |
516 | dev_put(real_dev); | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | lowpan_dev_info(dev)->real_dev = real_dev; | |
521 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); | |
522 | ||
523 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
524 | if (!entry) { | |
525 | dev_put(real_dev); | |
526 | lowpan_dev_info(dev)->real_dev = NULL; | |
527 | return -ENOMEM; | |
528 | } | |
529 | ||
530 | entry->ldev = dev; | |
531 | ||
532 | /* Set the lowpan harware address to the wpan hardware address. */ | |
533 | memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); | |
534 | ||
535 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
536 | INIT_LIST_HEAD(&entry->list); | |
537 | list_add_tail(&entry->list, &lowpan_devices); | |
538 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
539 | ||
540 | register_netdevice(dev); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
546 | { | |
547 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
548 | struct net_device *real_dev = lowpan_dev->real_dev; | |
549 | struct lowpan_dev_record *entry, *tmp; | |
550 | ||
551 | ASSERT_RTNL(); | |
552 | ||
553 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
554 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
555 | if (entry->ldev == dev) { | |
556 | list_del(&entry->list); | |
557 | kfree(entry); | |
558 | } | |
559 | } | |
560 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
561 | ||
562 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
563 | ||
564 | unregister_netdevice_queue(dev, head); | |
565 | ||
566 | dev_put(real_dev); | |
567 | } | |
568 | ||
569 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
570 | .kind = "lowpan", | |
571 | .priv_size = sizeof(struct lowpan_dev_info), | |
572 | .setup = lowpan_setup, | |
573 | .newlink = lowpan_newlink, | |
574 | .dellink = lowpan_dellink, | |
575 | .validate = lowpan_validate, | |
576 | }; | |
577 | ||
578 | static inline int __init lowpan_netlink_init(void) | |
579 | { | |
580 | return rtnl_link_register(&lowpan_link_ops); | |
581 | } | |
582 | ||
583 | static inline void lowpan_netlink_fini(void) | |
584 | { | |
585 | rtnl_link_unregister(&lowpan_link_ops); | |
586 | } | |
587 | ||
588 | static int lowpan_device_event(struct notifier_block *unused, | |
589 | unsigned long event, void *ptr) | |
590 | { | |
591 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
592 | LIST_HEAD(del_list); | |
593 | struct lowpan_dev_record *entry, *tmp; | |
594 | ||
595 | if (dev->type != ARPHRD_IEEE802154) | |
596 | goto out; | |
597 | ||
598 | if (event == NETDEV_UNREGISTER) { | |
599 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
600 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
601 | lowpan_dellink(entry->ldev, &del_list); | |
602 | } | |
603 | ||
604 | unregister_netdevice_many(&del_list); | |
605 | } | |
606 | ||
607 | out: | |
608 | return NOTIFY_DONE; | |
609 | } | |
610 | ||
611 | static struct notifier_block lowpan_dev_notifier = { | |
612 | .notifier_call = lowpan_device_event, | |
613 | }; | |
614 | ||
615 | static struct packet_type lowpan_packet_type = { | |
616 | .type = __constant_htons(ETH_P_IEEE802154), | |
617 | .func = lowpan_rcv, | |
618 | }; | |
619 | ||
620 | static int __init lowpan_init_module(void) | |
621 | { | |
622 | int err = 0; | |
623 | ||
624 | err = lowpan_net_frag_init(); | |
625 | if (err < 0) | |
626 | goto out; | |
627 | ||
628 | err = lowpan_netlink_init(); | |
629 | if (err < 0) | |
630 | goto out_frag; | |
631 | ||
632 | dev_add_pack(&lowpan_packet_type); | |
633 | ||
634 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
635 | if (err < 0) | |
636 | goto out_pack; | |
637 | ||
638 | return 0; | |
639 | ||
640 | out_pack: | |
641 | dev_remove_pack(&lowpan_packet_type); | |
642 | lowpan_netlink_fini(); | |
643 | out_frag: | |
644 | lowpan_net_frag_exit(); | |
645 | out: | |
646 | return err; | |
647 | } | |
648 | ||
649 | static void __exit lowpan_cleanup_module(void) | |
650 | { | |
651 | lowpan_netlink_fini(); | |
652 | ||
653 | dev_remove_pack(&lowpan_packet_type); | |
654 | ||
655 | lowpan_net_frag_exit(); | |
656 | ||
657 | unregister_netdevice_notifier(&lowpan_dev_notifier); | |
658 | } | |
659 | ||
660 | module_init(lowpan_init_module); | |
661 | module_exit(lowpan_cleanup_module); | |
662 | MODULE_LICENSE("GPL"); | |
663 | MODULE_ALIAS_RTNL_LINK("lowpan"); |