?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[linux/fpc-iii.git] / net / ieee802154 / 6lowpan.c
blobf651da60f1618f089c2d21eef069ac5b3648218d
1 /*
2 * Copyright 2011, Siemens AG
3 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
4 */
5
6 /*
7 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24 /* Jon's code is based on 6lowpan implementation for Contiki which is:
25 * Copyright (c) 2008, Swedish Institute of Computer Science.
26 * All rights reserved.
27 *
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
30 * are met:
31 * 1. Redistributions of source code must retain the above copyright
32 * notice, this list of conditions and the following disclaimer.
33 * 2. Redistributions in binary form must reproduce the above copyright
34 * notice, this list of conditions and the following disclaimer in the
35 * documentation and/or other materials provided with the distribution.
36 * 3. Neither the name of the Institute nor the names of its contributors
37 * may be used to endorse or promote products derived from this software
38 * without specific prior written permission.
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 */
52
53 #include <linux/bitops.h>
54 #include <linux/if_arp.h>
55 #include <linux/module.h>
56 #include <linux/moduleparam.h>
57 #include <linux/netdevice.h>
58 #include <net/af_ieee802154.h>
59 #include <net/ieee802154.h>
60 #include <net/ieee802154_netdev.h>
61 #include <net/ipv6.h>
62
63 #include "6lowpan.h"
64
65 /* TTL uncompression values */
66 static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
67
68 static LIST_HEAD(lowpan_devices);
69
70 /*
71 * Uncompression of linklocal:
72 * 0 -> 16 bytes from packet
73 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
74 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
75 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
76 *
77 * NOTE: => the uncompress function does change 0xf to 0x10
78 * NOTE: 0x00 => no-autoconfig => unspecified
79 */
80 static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
81
82 /*
83 * Uncompression of ctx-based:
84 * 0 -> 0 bits from packet [unspecified / reserved]
85 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
86 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
87 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
88 */
89 static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
90
91 /*
92 * Uncompression of ctx-base
93 * 0 -> 0 bits from packet
94 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
95 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
96 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
97 */
98 static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
99
100 /* Link local prefix */
101 static const u8 lowpan_llprefix[] = {0xfe, 0x80};
102
103 /* private device info */
104 struct lowpan_dev_info {
105 struct net_device *real_dev; /* real WPAN device ptr */
106 struct mutex dev_list_mtx; /* mutex for list ops */
107 };
108
109 struct lowpan_dev_record {
110 struct net_device *ldev;
111 struct list_head list;
112 };
113
114 struct lowpan_fragment {
115 struct sk_buff *skb; /* skb to be assembled */
116 u16 length; /* length to be assemled */
117 u32 bytes_rcv; /* bytes received */
118 u16 tag; /* current fragment tag */
119 struct timer_list timer; /* assembling timer */
120 struct list_head list; /* fragments list */
121 };
122
123 static unsigned short fragment_tag;
124 static LIST_HEAD(lowpan_fragments);
125 static DEFINE_SPINLOCK(flist_lock);
126
127 static inline struct
128 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
129 {
130 return netdev_priv(dev);
131 }
132
133 static inline void lowpan_address_flip(u8 *src, u8 *dest)
134 {
135 int i;
136 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
137 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
138 }
139
140 /* list of all 6lowpan devices, uses for package delivering */
141 /* print data in line */
142 static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
143 unsigned char *buf, int len)
144 {
145 #ifdef DEBUG
146 if (msg)
147 pr_debug("(%s) %s: ", caller, msg);
148 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
149 16, 1, buf, len, false);
150 #endif /* DEBUG */
151 }
152
153 /*
154 * print data in a table format:
155 *
156 * addr: xx xx xx xx xx xx
157 * addr: xx xx xx xx xx xx
158 * ...
159 */
160 static inline void lowpan_raw_dump_table(const char *caller, char *msg,
161 unsigned char *buf, int len)
162 {
163 #ifdef DEBUG
164 if (msg)
165 pr_debug("(%s) %s:\n", caller, msg);
166 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
167 16, 1, buf, len, false);
168 #endif /* DEBUG */
169 }
170
171 static u8
172 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
173 const unsigned char *lladdr)
174 {
175 u8 val = 0;
176
177 if (is_addr_mac_addr_based(ipaddr, lladdr))
178 val = 3; /* 0-bits */
179 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
180 /* compress IID to 16 bits xxxx::XXXX */
181 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
182 *hc06_ptr += 2;
183 val = 2; /* 16-bits */
184 } else {
185 /* do not compress IID => xxxx::IID */
186 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
187 *hc06_ptr += 8;
188 val = 1; /* 64-bits */
189 }
190
191 return rol8(val, shift);
192 }
193
194 static void
195 lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
196 {
197 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN);
198 /* second bit-flip (Universe/Local) is done according RFC2464 */
199 ipaddr->s6_addr[8] ^= 0x02;
200 }
201
202 /*
203 * Uncompress addresses based on a prefix and a postfix with zeroes in
204 * between. If the postfix is zero in length it will use the link address
205 * to configure the IP address (autoconf style).
206 * pref_post_count takes a byte where the first nibble specify prefix count
207 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
208 */
209 static int
210 lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
211 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
212 {
213 u8 prefcount = pref_post_count >> 4;
214 u8 postcount = pref_post_count & 0x0f;
215
216 /* full nibble 15 => 16 */
217 prefcount = (prefcount == 15 ? 16 : prefcount);
218 postcount = (postcount == 15 ? 16 : postcount);
219
220 if (lladdr)
221 lowpan_raw_dump_inline(__func__, "linklocal address",
222 lladdr, IEEE802154_ADDR_LEN);
223 if (prefcount > 0)
224 memcpy(ipaddr, prefix, prefcount);
225
226 if (prefcount + postcount < 16)
227 memset(&ipaddr->s6_addr[prefcount], 0,
228 16 - (prefcount + postcount));
229
230 if (postcount > 0) {
231 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
232 skb_pull(skb, postcount);
233 } else if (prefcount > 0) {
234 if (lladdr == NULL)
235 return -EINVAL;
236
237 /* no IID based configuration if no prefix and no data */
238 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
239 }
240
241 pr_debug("uncompressing %d + %d => ", prefcount, postcount);
242 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
243
244 return 0;
245 }
246
247 static void
248 lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
249 {
250 struct udphdr *uh = udp_hdr(skb);
251
252 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
253 LOWPAN_NHC_UDP_4BIT_PORT) &&
254 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
255 LOWPAN_NHC_UDP_4BIT_PORT)) {
256 pr_debug("UDP header: both ports compression to 4 bits\n");
257 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
258 **(hc06_ptr + 1) = /* subtraction is faster */
259 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
260 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
261 *hc06_ptr += 2;
262 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
263 LOWPAN_NHC_UDP_8BIT_PORT) {
264 pr_debug("UDP header: remove 8 bits of dest\n");
265 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
266 memcpy(*hc06_ptr + 1, &uh->source, 2);
267 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
268 *hc06_ptr += 4;
269 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
270 LOWPAN_NHC_UDP_8BIT_PORT) {
271 pr_debug("UDP header: remove 8 bits of source\n");
272 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
273 memcpy(*hc06_ptr + 1, &uh->dest, 2);
274 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
275 *hc06_ptr += 4;
276 } else {
277 pr_debug("UDP header: can't compress\n");
278 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
279 memcpy(*hc06_ptr + 1, &uh->source, 2);
280 memcpy(*hc06_ptr + 3, &uh->dest, 2);
281 *hc06_ptr += 5;
282 }
283
284 /* checksum is always inline */
285 memcpy(*hc06_ptr, &uh->check, 2);
286 *hc06_ptr += 2;
287 }
288
289 static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
290 {
291 if (unlikely(!pskb_may_pull(skb, 1)))
292 return -EINVAL;
293
294 *val = skb->data[0];
295 skb_pull(skb, 1);
296
297 return 0;
298 }
299
300 static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
301 {
302 if (unlikely(!pskb_may_pull(skb, 2)))
303 return -EINVAL;
304
305 *val = (skb->data[0] << 8) | skb->data[1];
306 skb_pull(skb, 2);
307
308 return 0;
309 }
310
311 static int
312 lowpan_uncompress_udp_header(struct sk_buff *skb)
313 {
314 struct udphdr *uh = udp_hdr(skb);
315 u8 tmp;
316
317 if (!uh)
318 goto err;
319
320 if (lowpan_fetch_skb_u8(skb, &tmp))
321 goto err;
322
323 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
324 pr_debug("UDP header uncompression\n");
325 switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
326 case LOWPAN_NHC_UDP_CS_P_00:
327 memcpy(&uh->source, &skb->data[0], 2);
328 memcpy(&uh->dest, &skb->data[2], 2);
329 skb_pull(skb, 4);
330 break;
331 case LOWPAN_NHC_UDP_CS_P_01:
332 memcpy(&uh->source, &skb->data[0], 2);
333 uh->dest =
334 skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
335 skb_pull(skb, 3);
336 break;
337 case LOWPAN_NHC_UDP_CS_P_10:
338 uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
339 memcpy(&uh->dest, &skb->data[1], 2);
340 skb_pull(skb, 3);
341 break;
342 case LOWPAN_NHC_UDP_CS_P_11:
343 uh->source =
344 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
345 uh->dest =
346 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
347 skb_pull(skb, 1);
348 break;
349 default:
350 pr_debug("ERROR: unknown UDP format\n");
351 goto err;
352 break;
353 }
354
355 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
356 uh->source, uh->dest);
357
358 /* copy checksum */
359 memcpy(&uh->check, &skb->data[0], 2);
360 skb_pull(skb, 2);
361 } else {
362 pr_debug("ERROR: unsupported NH format\n");
363 goto err;
364 }
365
366 return 0;
367 err:
368 return -EINVAL;
369 }
370
371 static int lowpan_header_create(struct sk_buff *skb,
372 struct net_device *dev,
373 unsigned short type, const void *_daddr,
374 const void *_saddr, unsigned int len)
375 {
376 u8 tmp, iphc0, iphc1, *hc06_ptr;
377 struct ipv6hdr *hdr;
378 const u8 *saddr = _saddr;
379 const u8 *daddr = _daddr;
380 u8 *head;
381 struct ieee802154_addr sa, da;
382
383 if (type != ETH_P_IPV6)
384 return 0;
385 /* TODO:
386 * if this package isn't ipv6 one, where should it be routed?
387 */
388 head = kzalloc(100, GFP_KERNEL);
389 if (head == NULL)
390 return -ENOMEM;
391
392 hdr = ipv6_hdr(skb);
393 hc06_ptr = head + 2;
394
395 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
396 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
397 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
398
399 lowpan_raw_dump_table(__func__, "raw skb network header dump",
400 skb_network_header(skb), sizeof(struct ipv6hdr));
401
402 if (!saddr)
403 saddr = dev->dev_addr;
404
405 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
406
407 /*
408 * As we copy some bit-length fields, in the IPHC encoding bytes,
409 * we sometimes use |=
410 * If the field is 0, and the current bit value in memory is 1,
411 * this does not work. We therefore reset the IPHC encoding here
412 */
413 iphc0 = LOWPAN_DISPATCH_IPHC;
414 iphc1 = 0;
415
416 /* TODO: context lookup */
417
418 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
419
420 /*
421 * Traffic class, flow label
422 * If flow label is 0, compress it. If traffic class is 0, compress it
423 * We have to process both in the same time as the offset of traffic
424 * class depends on the presence of version and flow label
425 */
426
427 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
428 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
429 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
430
431 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
432 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
433 /* flow label can be compressed */
434 iphc0 |= LOWPAN_IPHC_FL_C;
435 if ((hdr->priority == 0) &&
436 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
437 /* compress (elide) all */
438 iphc0 |= LOWPAN_IPHC_TC_C;
439 } else {
440 /* compress only the flow label */
441 *hc06_ptr = tmp;
442 hc06_ptr += 1;
443 }
444 } else {
445 /* Flow label cannot be compressed */
446 if ((hdr->priority == 0) &&
447 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
448 /* compress only traffic class */
449 iphc0 |= LOWPAN_IPHC_TC_C;
450 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
451 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
452 hc06_ptr += 3;
453 } else {
454 /* compress nothing */
455 memcpy(hc06_ptr, &hdr, 4);
456 /* replace the top byte with new ECN | DSCP format */
457 *hc06_ptr = tmp;
458 hc06_ptr += 4;
459 }
460 }
461
462 /* NOTE: payload length is always compressed */
463
464 /* Next Header is compress if UDP */
465 if (hdr->nexthdr == UIP_PROTO_UDP)
466 iphc0 |= LOWPAN_IPHC_NH_C;
467
468 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
469 *hc06_ptr = hdr->nexthdr;
470 hc06_ptr += 1;
471 }
472
473 /*
474 * Hop limit
475 * if 1: compress, encoding is 01
476 * if 64: compress, encoding is 10
477 * if 255: compress, encoding is 11
478 * else do not compress
479 */
480 switch (hdr->hop_limit) {
481 case 1:
482 iphc0 |= LOWPAN_IPHC_TTL_1;
483 break;
484 case 64:
485 iphc0 |= LOWPAN_IPHC_TTL_64;
486 break;
487 case 255:
488 iphc0 |= LOWPAN_IPHC_TTL_255;
489 break;
490 default:
491 *hc06_ptr = hdr->hop_limit;
492 hc06_ptr += 1;
493 break;
494 }
495
496 /* source address compression */
497 if (is_addr_unspecified(&hdr->saddr)) {
498 pr_debug("source address is unspecified, setting SAC\n");
499 iphc1 |= LOWPAN_IPHC_SAC;
500 /* TODO: context lookup */
501 } else if (is_addr_link_local(&hdr->saddr)) {
502 pr_debug("source address is link-local\n");
503 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
504 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
505 } else {
506 pr_debug("send the full source address\n");
507 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
508 hc06_ptr += 16;
509 }
510
511 /* destination address compression */
512 if (is_addr_mcast(&hdr->daddr)) {
513 pr_debug("destination address is multicast: ");
514 iphc1 |= LOWPAN_IPHC_M;
515 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
516 pr_debug("compressed to 1 octet\n");
517 iphc1 |= LOWPAN_IPHC_DAM_11;
518 /* use last byte */
519 *hc06_ptr = hdr->daddr.s6_addr[15];
520 hc06_ptr += 1;
521 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
522 pr_debug("compressed to 4 octets\n");
523 iphc1 |= LOWPAN_IPHC_DAM_10;
524 /* second byte + the last three */
525 *hc06_ptr = hdr->daddr.s6_addr[1];
526 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
527 hc06_ptr += 4;
528 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
529 pr_debug("compressed to 6 octets\n");
530 iphc1 |= LOWPAN_IPHC_DAM_01;
531 /* second byte + the last five */
532 *hc06_ptr = hdr->daddr.s6_addr[1];
533 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
534 hc06_ptr += 6;
535 } else {
536 pr_debug("using full address\n");
537 iphc1 |= LOWPAN_IPHC_DAM_00;
538 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
539 hc06_ptr += 16;
540 }
541 } else {
542 /* TODO: context lookup */
543 if (is_addr_link_local(&hdr->daddr)) {
544 pr_debug("dest address is unicast and link-local\n");
545 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
546 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
547 } else {
548 pr_debug("dest address is unicast: using full one\n");
549 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
550 hc06_ptr += 16;
551 }
552 }
553
554 /* UDP header compression */
555 if (hdr->nexthdr == UIP_PROTO_UDP)
556 lowpan_compress_udp_header(&hc06_ptr, skb);
557
558 head[0] = iphc0;
559 head[1] = iphc1;
560
561 skb_pull(skb, sizeof(struct ipv6hdr));
562 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
563
564 kfree(head);
565
566 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
567 skb->len);
568
569 /*
570 * NOTE1: I'm still unsure about the fact that compression and WPAN
571 * header are created here and not later in the xmit. So wait for
572 * an opinion of net maintainers.
573 */
574 /*
575 * NOTE2: to be absolutely correct, we must derive PANid information
576 * from MAC subif of the 'dev' and 'real_dev' network devices, but
577 * this isn't implemented in mainline yet, so currently we assign 0xff
578 */
579 {
580 /* prepare wpan address data */
581 sa.addr_type = IEEE802154_ADDR_LONG;
582 sa.pan_id = 0xff;
583
584 da.addr_type = IEEE802154_ADDR_LONG;
585 da.pan_id = 0xff;
586
587 memcpy(&(da.hwaddr), daddr, 8);
588 memcpy(&(sa.hwaddr), saddr, 8);
589
590 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
591
592 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
593 type, (void *)&da, (void *)&sa, skb->len);
594 }
595 }
596
597 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
598 {
599 struct sk_buff *new;
600 struct lowpan_dev_record *entry;
601 int stat = NET_RX_SUCCESS;
602
603 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
604 GFP_ATOMIC);
605 kfree_skb(skb);
606
607 if (!new)
608 return -ENOMEM;
609
610 skb_push(new, sizeof(struct ipv6hdr));
611 skb_reset_network_header(new);
612 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
613
614 new->protocol = htons(ETH_P_IPV6);
615 new->pkt_type = PACKET_HOST;
616
617 rcu_read_lock();
618 list_for_each_entry_rcu(entry, &lowpan_devices, list)
619 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
620 skb = skb_copy(new, GFP_ATOMIC);
621 if (!skb) {
622 stat = -ENOMEM;
623 break;
624 }
625
626 skb->dev = entry->ldev;
627 stat = netif_rx(skb);
628 }
629 rcu_read_unlock();
630
631 kfree_skb(new);
632
633 return stat;
634 }
635
636 static void lowpan_fragment_timer_expired(unsigned long entry_addr)
637 {
638 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
639
640 pr_debug("timer expired for frame with tag %d\n", entry->tag);
641
642 list_del(&entry->list);
643 dev_kfree_skb(entry->skb);
644 kfree(entry);
645 }
646
647 static struct lowpan_fragment *
648 lowpan_alloc_new_frame(struct sk_buff *skb, u8 len, u16 tag)
649 {
650 struct lowpan_fragment *frame;
651
652 frame = kzalloc(sizeof(struct lowpan_fragment),
653 GFP_ATOMIC);
654 if (!frame)
655 goto frame_err;
656
657 INIT_LIST_HEAD(&frame->list);
658
659 frame->length = len;
660 frame->tag = tag;
661
662 /* allocate buffer for frame assembling */
663 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
664 sizeof(struct ipv6hdr));
665
666 if (!frame->skb)
667 goto skb_err;
668
669 frame->skb->priority = skb->priority;
670 frame->skb->dev = skb->dev;
671
672 /* reserve headroom for uncompressed ipv6 header */
673 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
674 skb_put(frame->skb, frame->length);
675
676 init_timer(&frame->timer);
677 /* time out is the same as for ipv6 - 60 sec */
678 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
679 frame->timer.data = (unsigned long)frame;
680 frame->timer.function = lowpan_fragment_timer_expired;
681
682 add_timer(&frame->timer);
683
684 list_add_tail(&frame->list, &lowpan_fragments);
685
686 return frame;
687
688 skb_err:
689 kfree(frame);
690 frame_err:
691 return NULL;
692 }
693
694 static int
695 lowpan_process_data(struct sk_buff *skb)
696 {
697 struct ipv6hdr hdr;
698 u8 tmp, iphc0, iphc1, num_context = 0;
699 u8 *_saddr, *_daddr;
700 int err;
701
702 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
703 skb->len);
704 /* at least two bytes will be used for the encoding */
705 if (skb->len < 2)
706 goto drop;
707
708 if (lowpan_fetch_skb_u8(skb, &iphc0))
709 goto drop;
710
711 /* fragments assembling */
712 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
713 case LOWPAN_DISPATCH_FRAG1:
714 case LOWPAN_DISPATCH_FRAGN:
715 {
716 struct lowpan_fragment *frame;
717 /* slen stores the rightmost 8 bits of the 11 bits length */
718 u8 slen, offset;
719 u16 len, tag;
720 bool found = false;
721
722 if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
723 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
724 goto drop;
725
726 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
727 len = ((iphc0 & 7) << 8) | slen;
728
729 /*
730 * check if frame assembling with the same tag is
731 * already in progress
732 */
733 spin_lock_bh(&flist_lock);
734
735 list_for_each_entry(frame, &lowpan_fragments, list)
736 if (frame->tag == tag) {
737 found = true;
738 break;
739 }
740
741 /* alloc new frame structure */
742 if (!found) {
743 frame = lowpan_alloc_new_frame(skb, len, tag);
744 if (!frame)
745 goto unlock_and_drop;
746 }
747
748 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
749 goto unlock_and_drop;
750
751 if (lowpan_fetch_skb_u8(skb, &offset)) /* fetch offset */
752 goto unlock_and_drop;
753
754 /* if payload fits buffer, copy it */
755 if (likely((offset * 8 + skb->len) <= frame->length))
756 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
757 skb->data, skb->len);
758 else
759 goto unlock_and_drop;
760
761 frame->bytes_rcv += skb->len;
762
763 /* frame assembling complete */
764 if ((frame->bytes_rcv == frame->length) &&
765 frame->timer.expires > jiffies) {
766 /* if timer haven't expired - first of all delete it */
767 del_timer_sync(&frame->timer);
768 list_del(&frame->list);
769 spin_unlock_bh(&flist_lock);
770
771 dev_kfree_skb(skb);
772 skb = frame->skb;
773 kfree(frame);
774
775 if (lowpan_fetch_skb_u8(skb, &iphc0))
776 goto drop;
777
778 break;
779 }
780 spin_unlock_bh(&flist_lock);
781
782 return kfree_skb(skb), 0;
783 }
784 default:
785 break;
786 }
787
788 if (lowpan_fetch_skb_u8(skb, &iphc1))
789 goto drop;
790
791 _saddr = mac_cb(skb)->sa.hwaddr;
792 _daddr = mac_cb(skb)->da.hwaddr;
793
794 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
795
796 /* another if the CID flag is set */
797 if (iphc1 & LOWPAN_IPHC_CID) {
798 pr_debug("CID flag is set, increase header with one\n");
799 if (lowpan_fetch_skb_u8(skb, &num_context))
800 goto drop;
801 }
802
803 hdr.version = 6;
804
805 /* Traffic Class and Flow Label */
806 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
807 /*
808 * Traffic Class and FLow Label carried in-line
809 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
810 */
811 case 0: /* 00b */
812 if (lowpan_fetch_skb_u8(skb, &tmp))
813 goto drop;
814
815 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
816 skb_pull(skb, 3);
817 hdr.priority = ((tmp >> 2) & 0x0f);
818 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
819 (hdr.flow_lbl[0] & 0x0f);
820 break;
821 /*
822 * Traffic class carried in-line
823 * ECN + DSCP (1 byte), Flow Label is elided
824 */
825 case 1: /* 10b */
826 if (lowpan_fetch_skb_u8(skb, &tmp))
827 goto drop;
828
829 hdr.priority = ((tmp >> 2) & 0x0f);
830 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
831 hdr.flow_lbl[1] = 0;
832 hdr.flow_lbl[2] = 0;
833 break;
834 /*
835 * Flow Label carried in-line
836 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
837 */
838 case 2: /* 01b */
839 if (lowpan_fetch_skb_u8(skb, &tmp))
840 goto drop;
841
842 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
843 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
844 skb_pull(skb, 2);
845 break;
846 /* Traffic Class and Flow Label are elided */
847 case 3: /* 11b */
848 hdr.priority = 0;
849 hdr.flow_lbl[0] = 0;
850 hdr.flow_lbl[1] = 0;
851 hdr.flow_lbl[2] = 0;
852 break;
853 default:
854 break;
855 }
856
857 /* Next Header */
858 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
859 /* Next header is carried inline */
860 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
861 goto drop;
862
863 pr_debug("NH flag is set, next header carried inline: %02x\n",
864 hdr.nexthdr);
865 }
866
867 /* Hop Limit */
868 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
869 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
870 else {
871 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
872 goto drop;
873 }
874
875 /* Extract SAM to the tmp variable */
876 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
877
878 /* Source address uncompression */
879 pr_debug("source address stateless compression\n");
880 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
881 lowpan_unc_llconf[tmp], skb->data);
882 if (err)
883 goto drop;
884
885 /* Extract DAM to the tmp variable */
886 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
887
888 /* check for Multicast Compression */
889 if (iphc1 & LOWPAN_IPHC_M) {
890 if (iphc1 & LOWPAN_IPHC_DAC) {
891 pr_debug("dest: context-based mcast compression\n");
892 /* TODO: implement this */
893 } else {
894 u8 prefix[] = {0xff, 0x02};
895
896 pr_debug("dest: non context-based mcast compression\n");
897 if (0 < tmp && tmp < 3) {
898 if (lowpan_fetch_skb_u8(skb, &prefix[1]))
899 goto drop;
900 }
901
902 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
903 lowpan_unc_mxconf[tmp], NULL);
904 if (err)
905 goto drop;
906 }
907 } else {
908 pr_debug("dest: stateless compression\n");
909 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
910 lowpan_unc_llconf[tmp], skb->data);
911 if (err)
912 goto drop;
913 }
914
915 /* UDP data uncompression */
916 if (iphc0 & LOWPAN_IPHC_NH_C)
917 if (lowpan_uncompress_udp_header(skb))
918 goto drop;
919
920 /* Not fragmented package */
921 hdr.payload_len = htons(skb->len);
922
923 pr_debug("skb headroom size = %d, data length = %d\n",
924 skb_headroom(skb), skb->len);
925
926 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
927 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
928 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
929
930 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
931 sizeof(hdr));
932 return lowpan_skb_deliver(skb, &hdr);
933
934 unlock_and_drop:
935 spin_unlock_bh(&flist_lock);
936 drop:
937 kfree_skb(skb);
938 return -EINVAL;
939 }
940
941 static int lowpan_set_address(struct net_device *dev, void *p)
942 {
943 struct sockaddr *sa = p;
944
945 if (netif_running(dev))
946 return -EBUSY;
947
948 /* TODO: validate addr */
949 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
950
951 return 0;
952 }
953
954 static int lowpan_get_mac_header_length(struct sk_buff *skb)
955 {
956 /*
957 * Currently long addressing mode is supported only, so the overall
958 * header size is 21:
959 * FC SeqNum DPAN DA SA Sec
960 * 2 + 1 + 2 + 8 + 8 + 0 = 21
961 */
962 return 21;
963 }
964
965 static int
966 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
967 int mlen, int plen, int offset)
968 {
969 struct sk_buff *frag;
970 int hlen, ret;
971
972 /* if payload length is zero, therefore it's a first fragment */
973 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
974
975 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
976
977 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
978 if (!frag)
979 return -ENOMEM;
980
981 frag->priority = skb->priority;
982 frag->dev = skb->dev;
983
984 /* copy header, MFR and payload */
985 memcpy(skb_put(frag, mlen), skb->data, mlen);
986 memcpy(skb_put(frag, hlen), head, hlen);
987
988 if (plen)
989 skb_copy_from_linear_data_offset(skb, offset + mlen,
990 skb_put(frag, plen), plen);
991
992 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
993 frag->len);
994
995 ret = dev_queue_xmit(frag);
996
997 return ret;
998 }
999
1000 static int
1001 lowpan_skb_fragmentation(struct sk_buff *skb)
1002 {
1003 int err, header_length, payload_length, tag, offset = 0;
1004 u8 head[5];
1005
1006 header_length = lowpan_get_mac_header_length(skb);
1007 payload_length = skb->len - header_length;
1008 tag = fragment_tag++;
1009
1010 /* first fragment header */
1011 head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
1012 head[1] = payload_length & 0xff;
1013 head[2] = tag >> 8;
1014 head[3] = tag & 0xff;
1015
1016 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1017
1018 /* next fragment header */
1019 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1020 head[0] |= LOWPAN_DISPATCH_FRAGN;
1021
1022 while ((payload_length - offset > 0) && (err >= 0)) {
1023 int len = LOWPAN_FRAG_SIZE;
1024
1025 head[4] = offset / 8;
1026
1027 if (payload_length - offset < len)
1028 len = payload_length - offset;
1029
1030 err = lowpan_fragment_xmit(skb, head, header_length,
1031 len, offset);
1032 offset += len;
1033 }
1034
1035 return err;
1036 }
1037
1038 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1039 {
1040 int err = -1;
1041
1042 pr_debug("package xmit\n");
1043
1044 skb->dev = lowpan_dev_info(dev)->real_dev;
1045 if (skb->dev == NULL) {
1046 pr_debug("ERROR: no real wpan device found\n");
1047 goto error;
1048 }
1049
1050 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1051 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
1052 err = dev_queue_xmit(skb);
1053 goto out;
1054 }
1055
1056 pr_debug("frame is too big, fragmentation is needed\n");
1057 err = lowpan_skb_fragmentation(skb);
1058 error:
1059 dev_kfree_skb(skb);
1060 out:
1061 if (err < 0)
1062 pr_debug("ERROR: xmit failed\n");
1063
1064 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1065 }
1066
1067 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1068 {
1069 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1070 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1071 }
1072
1073 static u16 lowpan_get_pan_id(const struct net_device *dev)
1074 {
1075 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1076 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1077 }
1078
1079 static u16 lowpan_get_short_addr(const struct net_device *dev)
1080 {
1081 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1082 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1083 }
1084
1085 static struct header_ops lowpan_header_ops = {
1086 .create = lowpan_header_create,
1087 };
1088
1089 static const struct net_device_ops lowpan_netdev_ops = {
1090 .ndo_start_xmit = lowpan_xmit,
1091 .ndo_set_mac_address = lowpan_set_address,
1092 };
1093
1094 static struct ieee802154_mlme_ops lowpan_mlme = {
1095 .get_pan_id = lowpan_get_pan_id,
1096 .get_phy = lowpan_get_phy,
1097 .get_short_addr = lowpan_get_short_addr,
1098 };
1099
1100 static void lowpan_setup(struct net_device *dev)
1101 {
1102 dev->addr_len = IEEE802154_ADDR_LEN;
1103 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1104 dev->type = ARPHRD_IEEE802154;
1105 /* Frame Control + Sequence Number + Address fields + Security Header */
1106 dev->hard_header_len = 2 + 1 + 20 + 14;
1107 dev->needed_tailroom = 2; /* FCS */
1108 dev->mtu = 1281;
1109 dev->tx_queue_len = 0;
1110 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
1111 dev->watchdog_timeo = 0;
1112
1113 dev->netdev_ops = &lowpan_netdev_ops;
1114 dev->header_ops = &lowpan_header_ops;
1115 dev->ml_priv = &lowpan_mlme;
1116 dev->destructor = free_netdev;
1117 }
1118
1119 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1120 {
1121 if (tb[IFLA_ADDRESS]) {
1122 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1123 return -EINVAL;
1124 }
1125 return 0;
1126 }
1127
1128 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1129 struct packet_type *pt, struct net_device *orig_dev)
1130 {
1131 struct sk_buff *local_skb;
1132
1133 if (!netif_running(dev))
1134 goto drop;
1135
1136 if (dev->type != ARPHRD_IEEE802154)
1137 goto drop;
1138
1139 /* check that it's our buffer */
1140 switch (skb->data[0] & 0xe0) {
1141 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1142 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1143 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1144 local_skb = skb_clone(skb, GFP_ATOMIC);
1145 if (!local_skb)
1146 goto drop;
1147 lowpan_process_data(local_skb);
1148
1149 kfree_skb(skb);
1150 break;
1151 default:
1152 break;
1153 }
1154
1155 return NET_RX_SUCCESS;
1156
1157 drop:
1158 kfree_skb(skb);
1159 return NET_RX_DROP;
1160 }
1161
1162 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1163 struct nlattr *tb[], struct nlattr *data[])
1164 {
1165 struct net_device *real_dev;
1166 struct lowpan_dev_record *entry;
1167
1168 pr_debug("adding new link\n");
1169
1170 if (!tb[IFLA_LINK])
1171 return -EINVAL;
1172 /* find and hold real wpan device */
1173 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1174 if (!real_dev)
1175 return -ENODEV;
1176
1177 lowpan_dev_info(dev)->real_dev = real_dev;
1178 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1179
1180 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
1181 if (!entry) {
1182 dev_put(real_dev);
1183 lowpan_dev_info(dev)->real_dev = NULL;
1184 return -ENOMEM;
1185 }
1186
1187 entry->ldev = dev;
1188
1189 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1190 INIT_LIST_HEAD(&entry->list);
1191 list_add_tail(&entry->list, &lowpan_devices);
1192 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1193
1194 register_netdevice(dev);
1195
1196 return 0;
1197 }
1198
1199 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1200 {
1201 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1202 struct net_device *real_dev = lowpan_dev->real_dev;
1203 struct lowpan_dev_record *entry, *tmp;
1204
1205 ASSERT_RTNL();
1206
1207 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1208 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1209 if (entry->ldev == dev) {
1210 list_del(&entry->list);
1211 kfree(entry);
1212 }
1213 }
1214 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1215
1216 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1217
1218 unregister_netdevice_queue(dev, head);
1219
1220 dev_put(real_dev);
1221 }
1222
1223 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1224 .kind = "lowpan",
1225 .priv_size = sizeof(struct lowpan_dev_info),
1226 .setup = lowpan_setup,
1227 .newlink = lowpan_newlink,
1228 .dellink = lowpan_dellink,
1229 .validate = lowpan_validate,
1230 };
1231
1232 static inline int __init lowpan_netlink_init(void)
1233 {
1234 return rtnl_link_register(&lowpan_link_ops);
1235 }
1236
1237 static inline void __init lowpan_netlink_fini(void)
1238 {
1239 rtnl_link_unregister(&lowpan_link_ops);
1240 }
1241
1242 static int lowpan_device_event(struct notifier_block *unused,
1243 unsigned long event,
1244 void *ptr)
1245 {
1246 struct net_device *dev = ptr;
1247 LIST_HEAD(del_list);
1248 struct lowpan_dev_record *entry, *tmp;
1249
1250 if (dev->type != ARPHRD_IEEE802154)
1251 goto out;
1252
1253 if (event == NETDEV_UNREGISTER) {
1254 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1255 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
1256 lowpan_dellink(entry->ldev, &del_list);
1257 }
1258
1259 unregister_netdevice_many(&del_list);
1260 }
1261
1262 out:
1263 return NOTIFY_DONE;
1264 }
1265
1266 static struct notifier_block lowpan_dev_notifier = {
1267 .notifier_call = lowpan_device_event,
1268 };
1269
1270 static struct packet_type lowpan_packet_type = {
1271 .type = __constant_htons(ETH_P_IEEE802154),
1272 .func = lowpan_rcv,
1273 };
1274
1275 static int __init lowpan_init_module(void)
1276 {
1277 int err = 0;
1278
1279 err = lowpan_netlink_init();
1280 if (err < 0)
1281 goto out;
1282
1283 dev_add_pack(&lowpan_packet_type);
1284
1285 err = register_netdevice_notifier(&lowpan_dev_notifier);
1286 if (err < 0) {
1287 dev_remove_pack(&lowpan_packet_type);
1288 lowpan_netlink_fini();
1289 }
1290 out:
1291 return err;
1292 }
1293
1294 static void __exit lowpan_cleanup_module(void)
1295 {
1296 struct lowpan_fragment *frame, *tframe;
1297
1298 lowpan_netlink_fini();
1299
1300 dev_remove_pack(&lowpan_packet_type);
1301
1302 unregister_netdevice_notifier(&lowpan_dev_notifier);
1303
1304 /* Now 6lowpan packet_type is removed, so no new fragments are
1305 * expected on RX, therefore that's the time to clean incomplete
1306 * fragments.
1307 */
1308 spin_lock_bh(&flist_lock);
1309 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1310 del_timer_sync(&frame->timer);
1311 list_del(&frame->list);
1312 dev_kfree_skb(frame->skb);
1313 kfree(frame);
1314 }
1315 spin_unlock_bh(&flist_lock);
1316 }
1317
1318 module_init(lowpan_init_module);
1319 module_exit(lowpan_cleanup_module);
1320 MODULE_LICENSE("GPL");
1321 MODULE_ALIAS_RTNL_LINK("lowpan");
Linux with added FPC-III support