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Linux 3.12.28
[linux/fpc-iii.git] / net / ieee802154 / 6lowpan.c
blobceabe6f13216a29c52fdcd3495bd081bb33c9bb8
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 /* private device info */
71 struct lowpan_dev_info {
72 struct net_device *real_dev; /* real WPAN device ptr */
73 struct mutex dev_list_mtx; /* mutex for list ops */
74 unsigned short fragment_tag;
75 };
76
77 struct lowpan_dev_record {
78 struct net_device *ldev;
79 struct list_head list;
80 };
81
82 struct lowpan_fragment {
83 struct sk_buff *skb; /* skb to be assembled */
84 u16 length; /* length to be assemled */
85 u32 bytes_rcv; /* bytes received */
86 u16 tag; /* current fragment tag */
87 struct timer_list timer; /* assembling timer */
88 struct list_head list; /* fragments list */
89 };
90
91 static LIST_HEAD(lowpan_fragments);
92 static DEFINE_SPINLOCK(flist_lock);
93
94 static inline struct
95 lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
96 {
97 return netdev_priv(dev);
98 }
99
100 static inline void lowpan_address_flip(u8 *src, u8 *dest)
101 {
102 int i;
103 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
104 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
105 }
106
107 /* list of all 6lowpan devices, uses for package delivering */
108 /* print data in line */
109 static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
110 unsigned char *buf, int len)
111 {
112 #ifdef DEBUG
113 if (msg)
114 pr_debug("(%s) %s: ", caller, msg);
115 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
116 16, 1, buf, len, false);
117 #endif /* DEBUG */
118 }
119
120 /*
121 * print data in a table format:
122 *
123 * addr: xx xx xx xx xx xx
124 * addr: xx xx xx xx xx xx
125 * ...
126 */
127 static inline void lowpan_raw_dump_table(const char *caller, char *msg,
128 unsigned char *buf, int len)
129 {
130 #ifdef DEBUG
131 if (msg)
132 pr_debug("(%s) %s:\n", caller, msg);
133 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
134 16, 1, buf, len, false);
135 #endif /* DEBUG */
136 }
137
138 static u8
139 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
140 const unsigned char *lladdr)
141 {
142 u8 val = 0;
143
144 if (is_addr_mac_addr_based(ipaddr, lladdr))
145 val = 3; /* 0-bits */
146 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
147 /* compress IID to 16 bits xxxx::XXXX */
148 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
149 *hc06_ptr += 2;
150 val = 2; /* 16-bits */
151 } else {
152 /* do not compress IID => xxxx::IID */
153 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
154 *hc06_ptr += 8;
155 val = 1; /* 64-bits */
156 }
157
158 return rol8(val, shift);
159 }
160
161 /*
162 * Uncompress address function for source and
163 * destination address(non-multicast).
164 *
165 * address_mode is sam value or dam value.
166 */
167 static int
168 lowpan_uncompress_addr(struct sk_buff *skb,
169 struct in6_addr *ipaddr,
170 const u8 address_mode,
171 const struct ieee802154_addr *lladdr)
172 {
173 bool fail;
174
175 switch (address_mode) {
176 case LOWPAN_IPHC_ADDR_00:
177 /* for global link addresses */
178 fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
179 break;
180 case LOWPAN_IPHC_ADDR_01:
181 /* fe:80::XXXX:XXXX:XXXX:XXXX */
182 ipaddr->s6_addr[0] = 0xFE;
183 ipaddr->s6_addr[1] = 0x80;
184 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8);
185 break;
186 case LOWPAN_IPHC_ADDR_02:
187 /* fe:80::ff:fe00:XXXX */
188 ipaddr->s6_addr[0] = 0xFE;
189 ipaddr->s6_addr[1] = 0x80;
190 ipaddr->s6_addr[11] = 0xFF;
191 ipaddr->s6_addr[12] = 0xFE;
192 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2);
193 break;
194 case LOWPAN_IPHC_ADDR_03:
195 fail = false;
196 switch (lladdr->addr_type) {
197 case IEEE802154_ADDR_LONG:
198 /* fe:80::XXXX:XXXX:XXXX:XXXX
199 * \_________________/
200 * hwaddr
201 */
202 ipaddr->s6_addr[0] = 0xFE;
203 ipaddr->s6_addr[1] = 0x80;
204 memcpy(&ipaddr->s6_addr[8], lladdr->hwaddr,
205 IEEE802154_ADDR_LEN);
206 /* second bit-flip (Universe/Local)
207 * is done according RFC2464
208 */
209 ipaddr->s6_addr[8] ^= 0x02;
210 break;
211 case IEEE802154_ADDR_SHORT:
212 /* fe:80::ff:fe00:XXXX
213 * \__/
214 * short_addr
215 *
216 * Universe/Local bit is zero.
217 */
218 ipaddr->s6_addr[0] = 0xFE;
219 ipaddr->s6_addr[1] = 0x80;
220 ipaddr->s6_addr[11] = 0xFF;
221 ipaddr->s6_addr[12] = 0xFE;
222 ipaddr->s6_addr16[7] = htons(lladdr->short_addr);
223 break;
224 default:
225 pr_debug("Invalid addr_type set\n");
226 return -EINVAL;
227 }
228 break;
229 default:
230 pr_debug("Invalid address mode value: 0x%x\n", address_mode);
231 return -EINVAL;
232 }
233
234 if (fail) {
235 pr_debug("Failed to fetch skb data\n");
236 return -EIO;
237 }
238
239 lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 addr is:\n",
240 ipaddr->s6_addr, 16);
241
242 return 0;
243 }
244
245 /* Uncompress address function for source context
246 * based address(non-multicast).
247 */
248 static int
249 lowpan_uncompress_context_based_src_addr(struct sk_buff *skb,
250 struct in6_addr *ipaddr,
251 const u8 sam)
252 {
253 switch (sam) {
254 case LOWPAN_IPHC_ADDR_00:
255 /* unspec address ::
256 * Do nothing, address is already ::
257 */
258 break;
259 case LOWPAN_IPHC_ADDR_01:
260 /* TODO */
261 case LOWPAN_IPHC_ADDR_02:
262 /* TODO */
263 case LOWPAN_IPHC_ADDR_03:
264 /* TODO */
265 netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam);
266 return -EINVAL;
267 default:
268 pr_debug("Invalid sam value: 0x%x\n", sam);
269 return -EINVAL;
270 }
271
272 lowpan_raw_dump_inline(NULL,
273 "Reconstructed context based ipv6 src addr is:\n",
274 ipaddr->s6_addr, 16);
275
276 return 0;
277 }
278
279 /* Uncompress function for multicast destination address,
280 * when M bit is set.
281 */
282 static int
283 lowpan_uncompress_multicast_daddr(struct sk_buff *skb,
284 struct in6_addr *ipaddr,
285 const u8 dam)
286 {
287 bool fail;
288
289 switch (dam) {
290 case LOWPAN_IPHC_DAM_00:
291 /* 00: 128 bits. The full address
292 * is carried in-line.
293 */
294 fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
295 break;
296 case LOWPAN_IPHC_DAM_01:
297 /* 01: 48 bits. The address takes
298 * the form ffXX::00XX:XXXX:XXXX.
299 */
300 ipaddr->s6_addr[0] = 0xFF;
301 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
302 fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5);
303 break;
304 case LOWPAN_IPHC_DAM_10:
305 /* 10: 32 bits. The address takes
306 * the form ffXX::00XX:XXXX.
307 */
308 ipaddr->s6_addr[0] = 0xFF;
309 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
310 fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3);
311 break;
312 case LOWPAN_IPHC_DAM_11:
313 /* 11: 8 bits. The address takes
314 * the form ff02::00XX.
315 */
316 ipaddr->s6_addr[0] = 0xFF;
317 ipaddr->s6_addr[1] = 0x02;
318 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1);
319 break;
320 default:
321 pr_debug("DAM value has a wrong value: 0x%x\n", dam);
322 return -EINVAL;
323 }
324
325 if (fail) {
326 pr_debug("Failed to fetch skb data\n");
327 return -EIO;
328 }
329
330 lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is:\n",
331 ipaddr->s6_addr, 16);
332
333 return 0;
334 }
335
336 static void
337 lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
338 {
339 struct udphdr *uh = udp_hdr(skb);
340
341 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
342 LOWPAN_NHC_UDP_4BIT_PORT) &&
343 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
344 LOWPAN_NHC_UDP_4BIT_PORT)) {
345 pr_debug("UDP header: both ports compression to 4 bits\n");
346 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
347 **(hc06_ptr + 1) = /* subtraction is faster */
348 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
349 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
350 *hc06_ptr += 2;
351 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
352 LOWPAN_NHC_UDP_8BIT_PORT) {
353 pr_debug("UDP header: remove 8 bits of dest\n");
354 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
355 memcpy(*hc06_ptr + 1, &uh->source, 2);
356 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
357 *hc06_ptr += 4;
358 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
359 LOWPAN_NHC_UDP_8BIT_PORT) {
360 pr_debug("UDP header: remove 8 bits of source\n");
361 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
362 memcpy(*hc06_ptr + 1, &uh->dest, 2);
363 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
364 *hc06_ptr += 4;
365 } else {
366 pr_debug("UDP header: can't compress\n");
367 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
368 memcpy(*hc06_ptr + 1, &uh->source, 2);
369 memcpy(*hc06_ptr + 3, &uh->dest, 2);
370 *hc06_ptr += 5;
371 }
372
373 /* checksum is always inline */
374 memcpy(*hc06_ptr, &uh->check, 2);
375 *hc06_ptr += 2;
376
377 /* skip the UDP header */
378 skb_pull(skb, sizeof(struct udphdr));
379 }
380
381 static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
382 {
383 if (unlikely(!pskb_may_pull(skb, 1)))
384 return -EINVAL;
385
386 *val = skb->data[0];
387 skb_pull(skb, 1);
388
389 return 0;
390 }
391
392 static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
393 {
394 if (unlikely(!pskb_may_pull(skb, 2)))
395 return -EINVAL;
396
397 *val = (skb->data[0] << 8) | skb->data[1];
398 skb_pull(skb, 2);
399
400 return 0;
401 }
402
403 static int
404 lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
405 {
406 u8 tmp;
407
408 if (!uh)
409 goto err;
410
411 if (lowpan_fetch_skb_u8(skb, &tmp))
412 goto err;
413
414 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
415 pr_debug("UDP header uncompression\n");
416 switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
417 case LOWPAN_NHC_UDP_CS_P_00:
418 memcpy(&uh->source, &skb->data[0], 2);
419 memcpy(&uh->dest, &skb->data[2], 2);
420 skb_pull(skb, 4);
421 break;
422 case LOWPAN_NHC_UDP_CS_P_01:
423 memcpy(&uh->source, &skb->data[0], 2);
424 uh->dest =
425 skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
426 skb_pull(skb, 3);
427 break;
428 case LOWPAN_NHC_UDP_CS_P_10:
429 uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
430 memcpy(&uh->dest, &skb->data[1], 2);
431 skb_pull(skb, 3);
432 break;
433 case LOWPAN_NHC_UDP_CS_P_11:
434 uh->source =
435 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
436 uh->dest =
437 LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
438 skb_pull(skb, 1);
439 break;
440 default:
441 pr_debug("ERROR: unknown UDP format\n");
442 goto err;
443 break;
444 }
445
446 pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
447 uh->source, uh->dest);
448
449 /* copy checksum */
450 memcpy(&uh->check, &skb->data[0], 2);
451 skb_pull(skb, 2);
452
453 /*
454 * UDP lenght needs to be infered from the lower layers
455 * here, we obtain the hint from the remaining size of the
456 * frame
457 */
458 uh->len = htons(skb->len + sizeof(struct udphdr));
459 pr_debug("uncompressed UDP length: src = %d", uh->len);
460 } else {
461 pr_debug("ERROR: unsupported NH format\n");
462 goto err;
463 }
464
465 return 0;
466 err:
467 return -EINVAL;
468 }
469
470 static int lowpan_header_create(struct sk_buff *skb,
471 struct net_device *dev,
472 unsigned short type, const void *_daddr,
473 const void *_saddr, unsigned int len)
474 {
475 u8 tmp, iphc0, iphc1, *hc06_ptr;
476 struct ipv6hdr *hdr;
477 const u8 *saddr = _saddr;
478 const u8 *daddr = _daddr;
479 u8 head[100];
480 struct ieee802154_addr sa, da;
481
482 /* TODO:
483 * if this package isn't ipv6 one, where should it be routed?
484 */
485 if (type != ETH_P_IPV6)
486 return 0;
487
488 hdr = ipv6_hdr(skb);
489 hc06_ptr = head + 2;
490
491 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
492 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
493 ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
494
495 lowpan_raw_dump_table(__func__, "raw skb network header dump",
496 skb_network_header(skb), sizeof(struct ipv6hdr));
497
498 if (!saddr)
499 saddr = dev->dev_addr;
500
501 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
502
503 /*
504 * As we copy some bit-length fields, in the IPHC encoding bytes,
505 * we sometimes use |=
506 * If the field is 0, and the current bit value in memory is 1,
507 * this does not work. We therefore reset the IPHC encoding here
508 */
509 iphc0 = LOWPAN_DISPATCH_IPHC;
510 iphc1 = 0;
511
512 /* TODO: context lookup */
513
514 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
515
516 /*
517 * Traffic class, flow label
518 * If flow label is 0, compress it. If traffic class is 0, compress it
519 * We have to process both in the same time as the offset of traffic
520 * class depends on the presence of version and flow label
521 */
522
523 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
524 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
525 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
526
527 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
528 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
529 /* flow label can be compressed */
530 iphc0 |= LOWPAN_IPHC_FL_C;
531 if ((hdr->priority == 0) &&
532 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
533 /* compress (elide) all */
534 iphc0 |= LOWPAN_IPHC_TC_C;
535 } else {
536 /* compress only the flow label */
537 *hc06_ptr = tmp;
538 hc06_ptr += 1;
539 }
540 } else {
541 /* Flow label cannot be compressed */
542 if ((hdr->priority == 0) &&
543 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
544 /* compress only traffic class */
545 iphc0 |= LOWPAN_IPHC_TC_C;
546 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
547 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
548 hc06_ptr += 3;
549 } else {
550 /* compress nothing */
551 memcpy(hc06_ptr, &hdr, 4);
552 /* replace the top byte with new ECN | DSCP format */
553 *hc06_ptr = tmp;
554 hc06_ptr += 4;
555 }
556 }
557
558 /* NOTE: payload length is always compressed */
559
560 /* Next Header is compress if UDP */
561 if (hdr->nexthdr == UIP_PROTO_UDP)
562 iphc0 |= LOWPAN_IPHC_NH_C;
563
564 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
565 *hc06_ptr = hdr->nexthdr;
566 hc06_ptr += 1;
567 }
568
569 /*
570 * Hop limit
571 * if 1: compress, encoding is 01
572 * if 64: compress, encoding is 10
573 * if 255: compress, encoding is 11
574 * else do not compress
575 */
576 switch (hdr->hop_limit) {
577 case 1:
578 iphc0 |= LOWPAN_IPHC_TTL_1;
579 break;
580 case 64:
581 iphc0 |= LOWPAN_IPHC_TTL_64;
582 break;
583 case 255:
584 iphc0 |= LOWPAN_IPHC_TTL_255;
585 break;
586 default:
587 *hc06_ptr = hdr->hop_limit;
588 hc06_ptr += 1;
589 break;
590 }
591
592 /* source address compression */
593 if (is_addr_unspecified(&hdr->saddr)) {
594 pr_debug("source address is unspecified, setting SAC\n");
595 iphc1 |= LOWPAN_IPHC_SAC;
596 /* TODO: context lookup */
597 } else if (is_addr_link_local(&hdr->saddr)) {
598 pr_debug("source address is link-local\n");
599 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
600 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
601 } else {
602 pr_debug("send the full source address\n");
603 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
604 hc06_ptr += 16;
605 }
606
607 /* destination address compression */
608 if (is_addr_mcast(&hdr->daddr)) {
609 pr_debug("destination address is multicast: ");
610 iphc1 |= LOWPAN_IPHC_M;
611 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
612 pr_debug("compressed to 1 octet\n");
613 iphc1 |= LOWPAN_IPHC_DAM_11;
614 /* use last byte */
615 *hc06_ptr = hdr->daddr.s6_addr[15];
616 hc06_ptr += 1;
617 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
618 pr_debug("compressed to 4 octets\n");
619 iphc1 |= LOWPAN_IPHC_DAM_10;
620 /* second byte + the last three */
621 *hc06_ptr = hdr->daddr.s6_addr[1];
622 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
623 hc06_ptr += 4;
624 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
625 pr_debug("compressed to 6 octets\n");
626 iphc1 |= LOWPAN_IPHC_DAM_01;
627 /* second byte + the last five */
628 *hc06_ptr = hdr->daddr.s6_addr[1];
629 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
630 hc06_ptr += 6;
631 } else {
632 pr_debug("using full address\n");
633 iphc1 |= LOWPAN_IPHC_DAM_00;
634 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
635 hc06_ptr += 16;
636 }
637 } else {
638 /* TODO: context lookup */
639 if (is_addr_link_local(&hdr->daddr)) {
640 pr_debug("dest address is unicast and link-local\n");
641 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
642 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
643 } else {
644 pr_debug("dest address is unicast: using full one\n");
645 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
646 hc06_ptr += 16;
647 }
648 }
649
650 /* UDP header compression */
651 if (hdr->nexthdr == UIP_PROTO_UDP)
652 lowpan_compress_udp_header(&hc06_ptr, skb);
653
654 head[0] = iphc0;
655 head[1] = iphc1;
656
657 skb_pull(skb, sizeof(struct ipv6hdr));
658 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
659
660 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
661 skb->len);
662
663 /*
664 * NOTE1: I'm still unsure about the fact that compression and WPAN
665 * header are created here and not later in the xmit. So wait for
666 * an opinion of net maintainers.
667 */
668 /*
669 * NOTE2: to be absolutely correct, we must derive PANid information
670 * from MAC subif of the 'dev' and 'real_dev' network devices, but
671 * this isn't implemented in mainline yet, so currently we assign 0xff
672 */
673 {
674 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
675 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
676
677 /* prepare wpan address data */
678 sa.addr_type = IEEE802154_ADDR_LONG;
679 sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
680
681 memcpy(&(sa.hwaddr), saddr, 8);
682 /* intra-PAN communications */
683 da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
684
685 /*
686 * if the destination address is the broadcast address, use the
687 * corresponding short address
688 */
689 if (lowpan_is_addr_broadcast(daddr)) {
690 da.addr_type = IEEE802154_ADDR_SHORT;
691 da.short_addr = IEEE802154_ADDR_BROADCAST;
692 } else {
693 da.addr_type = IEEE802154_ADDR_LONG;
694 memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
695
696 /* request acknowledgment */
697 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
698 }
699
700 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
701 type, (void *)&da, (void *)&sa, skb->len);
702 }
703 }
704
705 static int lowpan_give_skb_to_devices(struct sk_buff *skb)
706 {
707 struct lowpan_dev_record *entry;
708 struct sk_buff *skb_cp;
709 int stat = NET_RX_SUCCESS;
710
711 rcu_read_lock();
712 list_for_each_entry_rcu(entry, &lowpan_devices, list)
713 if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
714 skb_cp = skb_copy(skb, GFP_ATOMIC);
715 if (!skb_cp) {
716 stat = -ENOMEM;
717 break;
718 }
719
720 skb_cp->dev = entry->ldev;
721 stat = netif_rx(skb_cp);
722 }
723 rcu_read_unlock();
724
725 return stat;
726 }
727
728 static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
729 {
730 struct sk_buff *new;
731 int stat = NET_RX_SUCCESS;
732
733 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
734 GFP_ATOMIC);
735 kfree_skb(skb);
736
737 if (!new)
738 return -ENOMEM;
739
740 skb_push(new, sizeof(struct ipv6hdr));
741 skb_reset_network_header(new);
742 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
743
744 new->protocol = htons(ETH_P_IPV6);
745 new->pkt_type = PACKET_HOST;
746
747 stat = lowpan_give_skb_to_devices(new);
748
749 kfree_skb(new);
750
751 return stat;
752 }
753
754 static void lowpan_fragment_timer_expired(unsigned long entry_addr)
755 {
756 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
757
758 pr_debug("timer expired for frame with tag %d\n", entry->tag);
759
760 list_del(&entry->list);
761 dev_kfree_skb(entry->skb);
762 kfree(entry);
763 }
764
765 static struct lowpan_fragment *
766 lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag)
767 {
768 struct lowpan_fragment *frame;
769
770 frame = kzalloc(sizeof(struct lowpan_fragment),
771 GFP_ATOMIC);
772 if (!frame)
773 goto frame_err;
774
775 INIT_LIST_HEAD(&frame->list);
776
777 frame->length = len;
778 frame->tag = tag;
779
780 /* allocate buffer for frame assembling */
781 frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
782 sizeof(struct ipv6hdr));
783
784 if (!frame->skb)
785 goto skb_err;
786
787 frame->skb->priority = skb->priority;
788 frame->skb->dev = skb->dev;
789
790 /* reserve headroom for uncompressed ipv6 header */
791 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
792 skb_put(frame->skb, frame->length);
793
794 /* copy the first control block to keep a
795 * trace of the link-layer addresses in case
796 * of a link-local compressed address
797 */
798 memcpy(frame->skb->cb, skb->cb, sizeof(skb->cb));
799
800 init_timer(&frame->timer);
801 /* time out is the same as for ipv6 - 60 sec */
802 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
803 frame->timer.data = (unsigned long)frame;
804 frame->timer.function = lowpan_fragment_timer_expired;
805
806 add_timer(&frame->timer);
807
808 list_add_tail(&frame->list, &lowpan_fragments);
809
810 return frame;
811
812 skb_err:
813 kfree(frame);
814 frame_err:
815 return NULL;
816 }
817
818 static int
819 lowpan_process_data(struct sk_buff *skb)
820 {
821 struct ipv6hdr hdr = {};
822 u8 tmp, iphc0, iphc1, num_context = 0;
823 const struct ieee802154_addr *_saddr, *_daddr;
824 int err;
825
826 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
827 skb->len);
828 /* at least two bytes will be used for the encoding */
829 if (skb->len < 2)
830 goto drop;
831
832 if (lowpan_fetch_skb_u8(skb, &iphc0))
833 goto drop;
834
835 /* fragments assembling */
836 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
837 case LOWPAN_DISPATCH_FRAG1:
838 case LOWPAN_DISPATCH_FRAGN:
839 {
840 struct lowpan_fragment *frame;
841 /* slen stores the rightmost 8 bits of the 11 bits length */
842 u8 slen, offset = 0;
843 u16 len, tag;
844 bool found = false;
845
846 if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
847 lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
848 goto drop;
849
850 /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
851 len = ((iphc0 & 7) << 8) | slen;
852
853 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) {
854 pr_debug("%s received a FRAG1 packet (tag: %d, "
855 "size of the entire IP packet: %d)",
856 __func__, tag, len);
857 } else { /* FRAGN */
858 if (lowpan_fetch_skb_u8(skb, &offset))
859 goto unlock_and_drop;
860 pr_debug("%s received a FRAGN packet (tag: %d, "
861 "size of the entire IP packet: %d, "
862 "offset: %d)", __func__, tag, len, offset * 8);
863 }
864
865 /*
866 * check if frame assembling with the same tag is
867 * already in progress
868 */
869 spin_lock_bh(&flist_lock);
870
871 list_for_each_entry(frame, &lowpan_fragments, list)
872 if (frame->tag == tag) {
873 found = true;
874 break;
875 }
876
877 /* alloc new frame structure */
878 if (!found) {
879 pr_debug("%s first fragment received for tag %d, "
880 "begin packet reassembly", __func__, tag);
881 frame = lowpan_alloc_new_frame(skb, len, tag);
882 if (!frame)
883 goto unlock_and_drop;
884 }
885
886 /* if payload fits buffer, copy it */
887 if (likely((offset * 8 + skb->len) <= frame->length))
888 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
889 skb->data, skb->len);
890 else
891 goto unlock_and_drop;
892
893 frame->bytes_rcv += skb->len;
894
895 /* frame assembling complete */
896 if ((frame->bytes_rcv == frame->length) &&
897 frame->timer.expires > jiffies) {
898 /* if timer haven't expired - first of all delete it */
899 del_timer_sync(&frame->timer);
900 list_del(&frame->list);
901 spin_unlock_bh(&flist_lock);
902
903 pr_debug("%s successfully reassembled fragment "
904 "(tag %d)", __func__, tag);
905
906 dev_kfree_skb(skb);
907 skb = frame->skb;
908 kfree(frame);
909
910 if (lowpan_fetch_skb_u8(skb, &iphc0))
911 goto drop;
912
913 break;
914 }
915 spin_unlock_bh(&flist_lock);
916
917 return kfree_skb(skb), 0;
918 }
919 default:
920 break;
921 }
922
923 if (lowpan_fetch_skb_u8(skb, &iphc1))
924 goto drop;
925
926 _saddr = &mac_cb(skb)->sa;
927 _daddr = &mac_cb(skb)->da;
928
929 pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
930
931 /* another if the CID flag is set */
932 if (iphc1 & LOWPAN_IPHC_CID) {
933 pr_debug("CID flag is set, increase header with one\n");
934 if (lowpan_fetch_skb_u8(skb, &num_context))
935 goto drop;
936 }
937
938 hdr.version = 6;
939
940 /* Traffic Class and Flow Label */
941 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
942 /*
943 * Traffic Class and FLow Label carried in-line
944 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
945 */
946 case 0: /* 00b */
947 if (lowpan_fetch_skb_u8(skb, &tmp))
948 goto drop;
949
950 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
951 skb_pull(skb, 3);
952 hdr.priority = ((tmp >> 2) & 0x0f);
953 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
954 (hdr.flow_lbl[0] & 0x0f);
955 break;
956 /*
957 * Traffic class carried in-line
958 * ECN + DSCP (1 byte), Flow Label is elided
959 */
960 case 2: /* 10b */
961 if (lowpan_fetch_skb_u8(skb, &tmp))
962 goto drop;
963
964 hdr.priority = ((tmp >> 2) & 0x0f);
965 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
966 break;
967 /*
968 * Flow Label carried in-line
969 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
970 */
971 case 1: /* 01b */
972 if (lowpan_fetch_skb_u8(skb, &tmp))
973 goto drop;
974
975 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
976 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
977 skb_pull(skb, 2);
978 break;
979 /* Traffic Class and Flow Label are elided */
980 case 3: /* 11b */
981 break;
982 default:
983 break;
984 }
985
986 /* Next Header */
987 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
988 /* Next header is carried inline */
989 if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
990 goto drop;
991
992 pr_debug("NH flag is set, next header carried inline: %02x\n",
993 hdr.nexthdr);
994 }
995
996 /* Hop Limit */
997 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
998 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
999 else {
1000 if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
1001 goto drop;
1002 }
1003
1004 /* Extract SAM to the tmp variable */
1005 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
1006
1007 if (iphc1 & LOWPAN_IPHC_SAC) {
1008 /* Source address context based uncompression */
1009 pr_debug("SAC bit is set. Handle context based source address.\n");
1010 err = lowpan_uncompress_context_based_src_addr(
1011 skb, &hdr.saddr, tmp);
1012 } else {
1013 /* Source address uncompression */
1014 pr_debug("source address stateless compression\n");
1015 err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr);
1016 }
1017
1018 /* Check on error of previous branch */
1019 if (err)
1020 goto drop;
1021
1022 /* Extract DAM to the tmp variable */
1023 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
1024
1025 /* check for Multicast Compression */
1026 if (iphc1 & LOWPAN_IPHC_M) {
1027 if (iphc1 & LOWPAN_IPHC_DAC) {
1028 pr_debug("dest: context-based mcast compression\n");
1029 /* TODO: implement this */
1030 } else {
1031 err = lowpan_uncompress_multicast_daddr(
1032 skb, &hdr.daddr, tmp);
1033 if (err)
1034 goto drop;
1035 }
1036 } else {
1037 pr_debug("dest: stateless compression\n");
1038 err = lowpan_uncompress_addr(skb, &hdr.daddr, tmp, _daddr);
1039 if (err)
1040 goto drop;
1041 }
1042
1043 /* UDP data uncompression */
1044 if (iphc0 & LOWPAN_IPHC_NH_C) {
1045 struct udphdr uh;
1046 struct sk_buff *new;
1047 if (lowpan_uncompress_udp_header(skb, &uh))
1048 goto drop;
1049
1050 /*
1051 * replace the compressed UDP head by the uncompressed UDP
1052 * header
1053 */
1054 new = skb_copy_expand(skb, sizeof(struct udphdr),
1055 skb_tailroom(skb), GFP_ATOMIC);
1056 kfree_skb(skb);
1057
1058 if (!new)
1059 return -ENOMEM;
1060
1061 skb = new;
1062
1063 skb_push(skb, sizeof(struct udphdr));
1064 skb_reset_transport_header(skb);
1065 skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
1066
1067 lowpan_raw_dump_table(__func__, "raw UDP header dump",
1068 (u8 *)&uh, sizeof(uh));
1069
1070 hdr.nexthdr = UIP_PROTO_UDP;
1071 }
1072
1073 /* Not fragmented package */
1074 hdr.payload_len = htons(skb->len);
1075
1076 pr_debug("skb headroom size = %d, data length = %d\n",
1077 skb_headroom(skb), skb->len);
1078
1079 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
1080 "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
1081 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
1082
1083 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
1084 sizeof(hdr));
1085 return lowpan_skb_deliver(skb, &hdr);
1086
1087 unlock_and_drop:
1088 spin_unlock_bh(&flist_lock);
1089 drop:
1090 kfree_skb(skb);
1091 return -EINVAL;
1092 }
1093
1094 static int lowpan_set_address(struct net_device *dev, void *p)
1095 {
1096 struct sockaddr *sa = p;
1097
1098 if (netif_running(dev))
1099 return -EBUSY;
1100
1101 /* TODO: validate addr */
1102 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1103
1104 return 0;
1105 }
1106
1107 static int lowpan_get_mac_header_length(struct sk_buff *skb)
1108 {
1109 /*
1110 * Currently long addressing mode is supported only, so the overall
1111 * header size is 21:
1112 * FC SeqNum DPAN DA SA Sec
1113 * 2 + 1 + 2 + 8 + 8 + 0 = 21
1114 */
1115 return 21;
1116 }
1117
1118 static int
1119 lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
1120 int mlen, int plen, int offset, int type)
1121 {
1122 struct sk_buff *frag;
1123 int hlen, ret;
1124
1125 hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
1126 LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
1127
1128 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
1129
1130 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
1131 if (!frag)
1132 return -ENOMEM;
1133
1134 frag->priority = skb->priority;
1135 frag->dev = skb->dev;
1136
1137 /* copy header, MFR and payload */
1138 memcpy(skb_put(frag, mlen), skb->data, mlen);
1139 memcpy(skb_put(frag, hlen), head, hlen);
1140
1141 if (plen)
1142 skb_copy_from_linear_data_offset(skb, offset + mlen,
1143 skb_put(frag, plen), plen);
1144
1145 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
1146 frag->len);
1147
1148 ret = dev_queue_xmit(frag);
1149
1150 return ret;
1151 }
1152
1153 static int
1154 lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
1155 {
1156 int err, header_length, payload_length, tag, offset = 0;
1157 u8 head[5];
1158
1159 header_length = lowpan_get_mac_header_length(skb);
1160 payload_length = skb->len - header_length;
1161 tag = lowpan_dev_info(dev)->fragment_tag++;
1162
1163 /* first fragment header */
1164 head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
1165 head[1] = payload_length & 0xff;
1166 head[2] = tag >> 8;
1167 head[3] = tag & 0xff;
1168
1169 err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE,
1170 0, LOWPAN_DISPATCH_FRAG1);
1171
1172 if (err) {
1173 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
1174 __func__, tag);
1175 goto exit;
1176 }
1177
1178 offset = LOWPAN_FRAG_SIZE;
1179
1180 /* next fragment header */
1181 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1182 head[0] |= LOWPAN_DISPATCH_FRAGN;
1183
1184 while ((payload_length - offset > 0) && (err >= 0)) {
1185 int len = LOWPAN_FRAG_SIZE;
1186
1187 head[4] = offset / 8;
1188
1189 if (payload_length - offset < len)
1190 len = payload_length - offset;
1191
1192 err = lowpan_fragment_xmit(skb, head, header_length,
1193 len, offset, LOWPAN_DISPATCH_FRAGN);
1194 if (err) {
1195 pr_debug("%s unable to send a subsequent FRAGN packet "
1196 "(tag: %d, offset: %d", __func__, tag, offset);
1197 goto exit;
1198 }
1199
1200 offset += len;
1201 }
1202
1203 exit:
1204 return err;
1205 }
1206
1207 static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1208 {
1209 int err = -1;
1210
1211 pr_debug("package xmit\n");
1212
1213 skb->dev = lowpan_dev_info(dev)->real_dev;
1214 if (skb->dev == NULL) {
1215 pr_debug("ERROR: no real wpan device found\n");
1216 goto error;
1217 }
1218
1219 /* Send directly if less than the MTU minus the 2 checksum bytes. */
1220 if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
1221 err = dev_queue_xmit(skb);
1222 goto out;
1223 }
1224
1225 pr_debug("frame is too big, fragmentation is needed\n");
1226 err = lowpan_skb_fragmentation(skb, dev);
1227 error:
1228 dev_kfree_skb(skb);
1229 out:
1230 if (err)
1231 pr_debug("ERROR: xmit failed\n");
1232
1233 return (err < 0) ? NET_XMIT_DROP : err;
1234 }
1235
1236 static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
1237 {
1238 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1239 return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
1240 }
1241
1242 static u16 lowpan_get_pan_id(const struct net_device *dev)
1243 {
1244 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1245 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
1246 }
1247
1248 static u16 lowpan_get_short_addr(const struct net_device *dev)
1249 {
1250 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1251 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
1252 }
1253
1254 static u8 lowpan_get_dsn(const struct net_device *dev)
1255 {
1256 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
1257 return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
1258 }
1259
1260 static struct header_ops lowpan_header_ops = {
1261 .create = lowpan_header_create,
1262 };
1263
1264 static struct lock_class_key lowpan_tx_busylock;
1265 static struct lock_class_key lowpan_netdev_xmit_lock_key;
1266
1267 static void lowpan_set_lockdep_class_one(struct net_device *dev,
1268 struct netdev_queue *txq,
1269 void *_unused)
1270 {
1271 lockdep_set_class(&txq->_xmit_lock,
1272 &lowpan_netdev_xmit_lock_key);
1273 }
1274
1275
1276 static int lowpan_dev_init(struct net_device *dev)
1277 {
1278 netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
1279 dev->qdisc_tx_busylock = &lowpan_tx_busylock;
1280 return 0;
1281 }
1282
1283 static const struct net_device_ops lowpan_netdev_ops = {
1284 .ndo_init = lowpan_dev_init,
1285 .ndo_start_xmit = lowpan_xmit,
1286 .ndo_set_mac_address = lowpan_set_address,
1287 };
1288
1289 static struct ieee802154_mlme_ops lowpan_mlme = {
1290 .get_pan_id = lowpan_get_pan_id,
1291 .get_phy = lowpan_get_phy,
1292 .get_short_addr = lowpan_get_short_addr,
1293 .get_dsn = lowpan_get_dsn,
1294 };
1295
1296 static void lowpan_setup(struct net_device *dev)
1297 {
1298 dev->addr_len = IEEE802154_ADDR_LEN;
1299 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1300 dev->type = ARPHRD_IEEE802154;
1301 /* Frame Control + Sequence Number + Address fields + Security Header */
1302 dev->hard_header_len = 2 + 1 + 20 + 14;
1303 dev->needed_tailroom = 2; /* FCS */
1304 dev->mtu = 1281;
1305 dev->tx_queue_len = 0;
1306 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
1307 dev->watchdog_timeo = 0;
1308
1309 dev->netdev_ops = &lowpan_netdev_ops;
1310 dev->header_ops = &lowpan_header_ops;
1311 dev->ml_priv = &lowpan_mlme;
1312 dev->destructor = free_netdev;
1313 }
1314
1315 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1316 {
1317 if (tb[IFLA_ADDRESS]) {
1318 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1319 return -EINVAL;
1320 }
1321 return 0;
1322 }
1323
1324 static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1325 struct packet_type *pt, struct net_device *orig_dev)
1326 {
1327 struct sk_buff *local_skb;
1328
1329 if (!netif_running(dev))
1330 goto drop;
1331
1332 if (dev->type != ARPHRD_IEEE802154)
1333 goto drop;
1334
1335 /* check that it's our buffer */
1336 if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
1337 /* Copy the packet so that the IPv6 header is
1338 * properly aligned.
1339 */
1340 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
1341 skb_tailroom(skb), GFP_ATOMIC);
1342 if (!local_skb)
1343 goto drop;
1344
1345 local_skb->protocol = htons(ETH_P_IPV6);
1346 local_skb->pkt_type = PACKET_HOST;
1347
1348 /* Pull off the 1-byte of 6lowpan header. */
1349 skb_pull(local_skb, 1);
1350 skb_reset_network_header(local_skb);
1351 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
1352
1353 lowpan_give_skb_to_devices(local_skb);
1354
1355 kfree_skb(local_skb);
1356 kfree_skb(skb);
1357 } else {
1358 switch (skb->data[0] & 0xe0) {
1359 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1360 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1361 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
1362 local_skb = skb_clone(skb, GFP_ATOMIC);
1363 if (!local_skb)
1364 goto drop;
1365 lowpan_process_data(local_skb);
1366
1367 kfree_skb(skb);
1368 break;
1369 default:
1370 break;
1371 }
1372 }
1373
1374 return NET_RX_SUCCESS;
1375
1376 drop:
1377 kfree_skb(skb);
1378 return NET_RX_DROP;
1379 }
1380
1381 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1382 struct nlattr *tb[], struct nlattr *data[])
1383 {
1384 struct net_device *real_dev;
1385 struct lowpan_dev_record *entry;
1386
1387 pr_debug("adding new link\n");
1388
1389 if (!tb[IFLA_LINK])
1390 return -EINVAL;
1391 /* find and hold real wpan device */
1392 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1393 if (!real_dev)
1394 return -ENODEV;
1395 if (real_dev->type != ARPHRD_IEEE802154)
1396 return -EINVAL;
1397
1398 lowpan_dev_info(dev)->real_dev = real_dev;
1399 lowpan_dev_info(dev)->fragment_tag = 0;
1400 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1401
1402 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
1403 if (!entry) {
1404 dev_put(real_dev);
1405 lowpan_dev_info(dev)->real_dev = NULL;
1406 return -ENOMEM;
1407 }
1408
1409 entry->ldev = dev;
1410
1411 /* Set the lowpan harware address to the wpan hardware address. */
1412 memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
1413
1414 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1415 INIT_LIST_HEAD(&entry->list);
1416 list_add_tail(&entry->list, &lowpan_devices);
1417 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1418
1419 register_netdevice(dev);
1420
1421 return 0;
1422 }
1423
1424 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1425 {
1426 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1427 struct net_device *real_dev = lowpan_dev->real_dev;
1428 struct lowpan_dev_record *entry, *tmp;
1429
1430 ASSERT_RTNL();
1431
1432 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1433 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1434 if (entry->ldev == dev) {
1435 list_del(&entry->list);
1436 kfree(entry);
1437 }
1438 }
1439 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1440
1441 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1442
1443 unregister_netdevice_queue(dev, head);
1444
1445 dev_put(real_dev);
1446 }
1447
1448 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1449 .kind = "lowpan",
1450 .priv_size = sizeof(struct lowpan_dev_info),
1451 .setup = lowpan_setup,
1452 .newlink = lowpan_newlink,
1453 .dellink = lowpan_dellink,
1454 .validate = lowpan_validate,
1455 };
1456
1457 static inline int __init lowpan_netlink_init(void)
1458 {
1459 return rtnl_link_register(&lowpan_link_ops);
1460 }
1461
1462 static inline void lowpan_netlink_fini(void)
1463 {
1464 rtnl_link_unregister(&lowpan_link_ops);
1465 }
1466
1467 static int lowpan_device_event(struct notifier_block *unused,
1468 unsigned long event, void *ptr)
1469 {
1470 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1471 LIST_HEAD(del_list);
1472 struct lowpan_dev_record *entry, *tmp;
1473
1474 if (dev->type != ARPHRD_IEEE802154)
1475 goto out;
1476
1477 if (event == NETDEV_UNREGISTER) {
1478 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
1479 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
1480 lowpan_dellink(entry->ldev, &del_list);
1481 }
1482
1483 unregister_netdevice_many(&del_list);
1484 }
1485
1486 out:
1487 return NOTIFY_DONE;
1488 }
1489
1490 static struct notifier_block lowpan_dev_notifier = {
1491 .notifier_call = lowpan_device_event,
1492 };
1493
1494 static struct packet_type lowpan_packet_type = {
1495 .type = __constant_htons(ETH_P_IEEE802154),
1496 .func = lowpan_rcv,
1497 };
1498
1499 static int __init lowpan_init_module(void)
1500 {
1501 int err = 0;
1502
1503 err = lowpan_netlink_init();
1504 if (err < 0)
1505 goto out;
1506
1507 dev_add_pack(&lowpan_packet_type);
1508
1509 err = register_netdevice_notifier(&lowpan_dev_notifier);
1510 if (err < 0) {
1511 dev_remove_pack(&lowpan_packet_type);
1512 lowpan_netlink_fini();
1513 }
1514 out:
1515 return err;
1516 }
1517
1518 static void __exit lowpan_cleanup_module(void)
1519 {
1520 struct lowpan_fragment *frame, *tframe;
1521
1522 lowpan_netlink_fini();
1523
1524 dev_remove_pack(&lowpan_packet_type);
1525
1526 unregister_netdevice_notifier(&lowpan_dev_notifier);
1527
1528 /* Now 6lowpan packet_type is removed, so no new fragments are
1529 * expected on RX, therefore that's the time to clean incomplete
1530 * fragments.
1531 */
1532 spin_lock_bh(&flist_lock);
1533 list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
1534 del_timer_sync(&frame->timer);
1535 list_del(&frame->list);
1536 dev_kfree_skb(frame->skb);
1537 kfree(frame);
1538 }
1539 spin_unlock_bh(&flist_lock);
1540 }
1541
1542 module_init(lowpan_init_module);
1543 module_exit(lowpan_cleanup_module);
1544 MODULE_LICENSE("GPL");
1545 MODULE_ALIAS_RTNL_LINK("lowpan");
Linux with added FPC-III support