blob: ec03626a31145ea627a776aded62c16b805cbe74 [file] [log] [blame]
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001/*
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
Alexander Smirnov44331fe2011-08-24 19:34:42 -070053#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>
Danny Kukawkacdf49c22012-02-22 02:36:39 +000058#include <linux/etherdevice.h>
Alexander Smirnov44331fe2011-08-24 19:34:42 -070059#include <net/af_ieee802154.h>
60#include <net/ieee802154.h>
61#include <net/ieee802154_netdev.h>
62#include <net/ipv6.h>
63
64#include "6lowpan.h"
65
66/* TTL uncompression values */
67static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
68
69static LIST_HEAD(lowpan_devices);
70
71/*
72 * Uncompression of linklocal:
73 * 0 -> 16 bytes from packet
74 * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
75 * 2 -> 2 bytes from prefix - zeroes + 2 from packet
76 * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
77 *
78 * NOTE: => the uncompress function does change 0xf to 0x10
79 * NOTE: 0x00 => no-autoconfig => unspecified
80 */
81static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
82
83/*
84 * Uncompression of ctx-based:
85 * 0 -> 0 bits from packet [unspecified / reserved]
86 * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
87 * 2 -> 8 bytes from prefix - zeroes + 2 from packet
88 * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
89 */
90static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
91
92/*
93 * Uncompression of ctx-base
94 * 0 -> 0 bits from packet
95 * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
96 * 2 -> 2 bytes from prefix - zeroes + 3 from packet
97 * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
98 */
99static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
100
101/* Link local prefix */
102static const u8 lowpan_llprefix[] = {0xfe, 0x80};
103
104/* private device info */
105struct lowpan_dev_info {
106 struct net_device *real_dev; /* real WPAN device ptr */
107 struct mutex dev_list_mtx; /* mutex for list ops */
108};
109
110struct lowpan_dev_record {
111 struct net_device *ldev;
112 struct list_head list;
113};
114
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000115struct lowpan_fragment {
116 struct sk_buff *skb; /* skb to be assembled */
117 spinlock_t lock; /* concurency lock */
118 u16 length; /* length to be assemled */
119 u32 bytes_rcv; /* bytes received */
120 u16 tag; /* current fragment tag */
121 struct timer_list timer; /* assembling timer */
122 struct list_head list; /* fragments list */
123};
124
125static unsigned short fragment_tag;
126static LIST_HEAD(lowpan_fragments);
127spinlock_t flist_lock;
128
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700129static inline struct
130lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
131{
132 return netdev_priv(dev);
133}
134
135static inline void lowpan_address_flip(u8 *src, u8 *dest)
136{
137 int i;
138 for (i = 0; i < IEEE802154_ADDR_LEN; i++)
139 (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
140}
141
142/* list of all 6lowpan devices, uses for package delivering */
143/* print data in line */
144static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
145 unsigned char *buf, int len)
146{
147#ifdef DEBUG
148 if (msg)
149 pr_debug("(%s) %s: ", caller, msg);
150 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
151 16, 1, buf, len, false);
152#endif /* DEBUG */
153}
154
155/*
156 * print data in a table format:
157 *
158 * addr: xx xx xx xx xx xx
159 * addr: xx xx xx xx xx xx
160 * ...
161 */
162static inline void lowpan_raw_dump_table(const char *caller, char *msg,
163 unsigned char *buf, int len)
164{
165#ifdef DEBUG
166 if (msg)
167 pr_debug("(%s) %s:\n", caller, msg);
168 print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
169 16, 1, buf, len, false);
170#endif /* DEBUG */
171}
172
173static u8
174lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
175 const unsigned char *lladdr)
176{
177 u8 val = 0;
178
179 if (is_addr_mac_addr_based(ipaddr, lladdr))
180 val = 3; /* 0-bits */
181 else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
182 /* compress IID to 16 bits xxxx::XXXX */
183 memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
184 *hc06_ptr += 2;
185 val = 2; /* 16-bits */
186 } else {
187 /* do not compress IID => xxxx::IID */
188 memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
189 *hc06_ptr += 8;
190 val = 1; /* 64-bits */
191 }
192
193 return rol8(val, shift);
194}
195
196static void
197lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
198{
199 memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN);
200 /* second bit-flip (Universe/Local) is done according RFC2464 */
201 ipaddr->s6_addr[8] ^= 0x02;
202}
203
204/*
205 * Uncompress addresses based on a prefix and a postfix with zeroes in
206 * between. If the postfix is zero in length it will use the link address
207 * to configure the IP address (autoconf style).
208 * pref_post_count takes a byte where the first nibble specify prefix count
209 * and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
210 */
211static int
212lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
213 u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
214{
215 u8 prefcount = pref_post_count >> 4;
216 u8 postcount = pref_post_count & 0x0f;
217
218 /* full nibble 15 => 16 */
219 prefcount = (prefcount == 15 ? 16 : prefcount);
220 postcount = (postcount == 15 ? 16 : postcount);
221
222 if (lladdr)
223 lowpan_raw_dump_inline(__func__, "linklocal address",
224 lladdr, IEEE802154_ALEN);
225 if (prefcount > 0)
226 memcpy(ipaddr, prefix, prefcount);
227
228 if (prefcount + postcount < 16)
229 memset(&ipaddr->s6_addr[prefcount], 0,
230 16 - (prefcount + postcount));
231
232 if (postcount > 0) {
233 memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
234 skb_pull(skb, postcount);
235 } else if (prefcount > 0) {
236 if (lladdr == NULL)
237 return -EINVAL;
238
239 /* no IID based configuration if no prefix and no data */
240 lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
241 }
242
243 pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount,
244 postcount);
245 lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
246
247 return 0;
248}
249
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000250static void
251lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
252{
253 struct udphdr *uh = udp_hdr(skb);
254
255 pr_debug("(%s): UDP header compression\n", __func__);
256
257 if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
258 LOWPAN_NHC_UDP_4BIT_PORT) &&
259 ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
260 LOWPAN_NHC_UDP_4BIT_PORT)) {
261 pr_debug("(%s): both ports compression to 4 bits\n", __func__);
262 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
263 **(hc06_ptr + 1) = /* subtraction is faster */
264 (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
265 ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
266 *hc06_ptr += 2;
267 } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
268 LOWPAN_NHC_UDP_8BIT_PORT) {
269 pr_debug("(%s): remove 8 bits of dest\n", __func__);
270 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
271 memcpy(*hc06_ptr + 1, &uh->source, 2);
272 **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
273 *hc06_ptr += 4;
274 } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
275 LOWPAN_NHC_UDP_8BIT_PORT) {
276 pr_debug("(%s): remove 8 bits of source\n", __func__);
277 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
278 memcpy(*hc06_ptr + 1, &uh->dest, 2);
279 **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
280 *hc06_ptr += 4;
281 } else {
282 pr_debug("(%s): can't compress header\n", __func__);
283 **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
284 memcpy(*hc06_ptr + 1, &uh->source, 2);
285 memcpy(*hc06_ptr + 3, &uh->dest, 2);
286 *hc06_ptr += 5;
287 }
288
289 /* checksum is always inline */
290 memcpy(*hc06_ptr, &uh->check, 2);
291 *hc06_ptr += 2;
292}
293
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700294static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
295{
296 u8 ret;
297
298 ret = skb->data[0];
299 skb_pull(skb, 1);
300
301 return ret;
302}
303
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000304static u16 lowpan_fetch_skb_u16(struct sk_buff *skb)
305{
306 u16 ret;
307
308 BUG_ON(!pskb_may_pull(skb, 2));
309
310 ret = skb->data[0] | (skb->data[1] << 8);
311 skb_pull(skb, 2);
312 return ret;
313}
314
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000315static int
316lowpan_uncompress_udp_header(struct sk_buff *skb)
317{
318 struct udphdr *uh = udp_hdr(skb);
319 u8 tmp;
320
321 tmp = lowpan_fetch_skb_u8(skb);
322
323 if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
324 pr_debug("(%s): UDP header uncompression\n", __func__);
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("(%s) ERROR: unknown UDP format\n", __func__);
351 goto err;
352 break;
353 }
354
355 pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n",
356 __func__, 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("(%s): ERROR: unsupported NH format\n", __func__);
363 goto err;
364 }
365
366 return 0;
367err:
368 return -EINVAL;
369}
370
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700371static int lowpan_header_create(struct sk_buff *skb,
372 struct net_device *dev,
373 unsigned short type, const void *_daddr,
Eric Dumazet95c96172012-04-15 05:58:06 +0000374 const void *_saddr, unsigned int len)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700375{
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("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
396 "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__,
397 hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
398 hdr->hop_limit);
399
400 lowpan_raw_dump_table(__func__, "raw skb network header dump",
401 skb_network_header(skb), sizeof(struct ipv6hdr));
402
403 if (!saddr)
404 saddr = dev->dev_addr;
405
406 lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
407
408 /*
409 * As we copy some bit-length fields, in the IPHC encoding bytes,
410 * we sometimes use |=
411 * If the field is 0, and the current bit value in memory is 1,
412 * this does not work. We therefore reset the IPHC encoding here
413 */
414 iphc0 = LOWPAN_DISPATCH_IPHC;
415 iphc1 = 0;
416
417 /* TODO: context lookup */
418
419 lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
420
421 /*
422 * Traffic class, flow label
423 * If flow label is 0, compress it. If traffic class is 0, compress it
424 * We have to process both in the same time as the offset of traffic
425 * class depends on the presence of version and flow label
426 */
427
428 /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
429 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
430 tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
431
432 if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
433 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
434 /* flow label can be compressed */
435 iphc0 |= LOWPAN_IPHC_FL_C;
436 if ((hdr->priority == 0) &&
437 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
438 /* compress (elide) all */
439 iphc0 |= LOWPAN_IPHC_TC_C;
440 } else {
441 /* compress only the flow label */
442 *hc06_ptr = tmp;
443 hc06_ptr += 1;
444 }
445 } else {
446 /* Flow label cannot be compressed */
447 if ((hdr->priority == 0) &&
448 ((hdr->flow_lbl[0] & 0xF0) == 0)) {
449 /* compress only traffic class */
450 iphc0 |= LOWPAN_IPHC_TC_C;
451 *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
452 memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
453 hc06_ptr += 3;
454 } else {
455 /* compress nothing */
456 memcpy(hc06_ptr, &hdr, 4);
457 /* replace the top byte with new ECN | DSCP format */
458 *hc06_ptr = tmp;
459 hc06_ptr += 4;
460 }
461 }
462
463 /* NOTE: payload length is always compressed */
464
465 /* Next Header is compress if UDP */
466 if (hdr->nexthdr == UIP_PROTO_UDP)
467 iphc0 |= LOWPAN_IPHC_NH_C;
468
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700469 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
470 *hc06_ptr = hdr->nexthdr;
471 hc06_ptr += 1;
472 }
473
474 /*
475 * Hop limit
476 * if 1: compress, encoding is 01
477 * if 64: compress, encoding is 10
478 * if 255: compress, encoding is 11
479 * else do not compress
480 */
481 switch (hdr->hop_limit) {
482 case 1:
483 iphc0 |= LOWPAN_IPHC_TTL_1;
484 break;
485 case 64:
486 iphc0 |= LOWPAN_IPHC_TTL_64;
487 break;
488 case 255:
489 iphc0 |= LOWPAN_IPHC_TTL_255;
490 break;
491 default:
492 *hc06_ptr = hdr->hop_limit;
493 break;
494 }
495
496 /* source address compression */
497 if (is_addr_unspecified(&hdr->saddr)) {
498 pr_debug("(%s): source address is unspecified, setting SAC\n",
499 __func__);
500 iphc1 |= LOWPAN_IPHC_SAC;
501 /* TODO: context lookup */
502 } else if (is_addr_link_local(&hdr->saddr)) {
503 pr_debug("(%s): source address is link-local\n", __func__);
504 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
505 LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
506 } else {
507 pr_debug("(%s): send the full source address\n", __func__);
508 memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
509 hc06_ptr += 16;
510 }
511
512 /* destination address compression */
513 if (is_addr_mcast(&hdr->daddr)) {
514 pr_debug("(%s): destination address is multicast", __func__);
515 iphc1 |= LOWPAN_IPHC_M;
516 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
517 pr_debug("compressed to 1 octet\n");
518 iphc1 |= LOWPAN_IPHC_DAM_11;
519 /* use last byte */
520 *hc06_ptr = hdr->daddr.s6_addr[15];
521 hc06_ptr += 1;
522 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
523 pr_debug("compressed to 4 octets\n");
524 iphc1 |= LOWPAN_IPHC_DAM_10;
525 /* second byte + the last three */
526 *hc06_ptr = hdr->daddr.s6_addr[1];
527 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
528 hc06_ptr += 4;
529 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
530 pr_debug("compressed to 6 octets\n");
531 iphc1 |= LOWPAN_IPHC_DAM_01;
532 /* second byte + the last five */
533 *hc06_ptr = hdr->daddr.s6_addr[1];
534 memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
535 hc06_ptr += 6;
536 } else {
537 pr_debug("using full address\n");
538 iphc1 |= LOWPAN_IPHC_DAM_00;
539 memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
540 hc06_ptr += 16;
541 }
542 } else {
543 pr_debug("(%s): destination address is unicast: ", __func__);
544 /* TODO: context lookup */
545 if (is_addr_link_local(&hdr->daddr)) {
546 pr_debug("destination address is link-local\n");
547 iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
548 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
549 } else {
550 pr_debug("using full address\n");
551 memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
552 hc06_ptr += 16;
553 }
554 }
555
alex.bluesman.smirnov@gmail.com3bd5b952011-11-10 07:40:14 +0000556 /* UDP header compression */
557 if (hdr->nexthdr == UIP_PROTO_UDP)
558 lowpan_compress_udp_header(&hc06_ptr, skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700559
560 head[0] = iphc0;
561 head[1] = iphc1;
562
563 skb_pull(skb, sizeof(struct ipv6hdr));
564 memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
565
566 kfree(head);
567
568 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
569 skb->len);
570
571 /*
572 * NOTE1: I'm still unsure about the fact that compression and WPAN
573 * header are created here and not later in the xmit. So wait for
574 * an opinion of net maintainers.
575 */
576 /*
577 * NOTE2: to be absolutely correct, we must derive PANid information
578 * from MAC subif of the 'dev' and 'real_dev' network devices, but
579 * this isn't implemented in mainline yet, so currently we assign 0xff
580 */
581 {
582 /* prepare wpan address data */
583 sa.addr_type = IEEE802154_ADDR_LONG;
584 sa.pan_id = 0xff;
585
586 da.addr_type = IEEE802154_ADDR_LONG;
587 da.pan_id = 0xff;
588
589 memcpy(&(da.hwaddr), daddr, 8);
590 memcpy(&(sa.hwaddr), saddr, 8);
591
592 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000593
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700594 return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
595 type, (void *)&da, (void *)&sa, skb->len);
596 }
597}
598
599static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
600{
601 struct sk_buff *new;
602 struct lowpan_dev_record *entry;
603 int stat = NET_RX_SUCCESS;
604
605 new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000606 GFP_ATOMIC);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700607 kfree_skb(skb);
608
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000609 if (!new)
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700610 return -ENOMEM;
611
612 skb_push(new, sizeof(struct ipv6hdr));
613 skb_reset_network_header(new);
614 skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
615
616 new->protocol = htons(ETH_P_IPV6);
617 new->pkt_type = PACKET_HOST;
618
619 rcu_read_lock();
620 list_for_each_entry_rcu(entry, &lowpan_devices, list)
621 if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000622 skb = skb_copy(new, GFP_ATOMIC);
623 if (!skb) {
624 stat = -ENOMEM;
625 break;
626 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700627
alex.bluesman.smirnov@gmail.comdcef1152011-09-01 03:55:15 +0000628 skb->dev = entry->ldev;
629 stat = netif_rx(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700630 }
631 rcu_read_unlock();
632
633 kfree_skb(new);
634
635 return stat;
636}
637
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000638static void lowpan_fragment_timer_expired(unsigned long entry_addr)
639{
640 struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
641
642 pr_debug("%s: timer expired for frame with tag %d\n", __func__,
643 entry->tag);
644
645 spin_lock(&flist_lock);
646 list_del(&entry->list);
647 spin_unlock(&flist_lock);
648
649 dev_kfree_skb(entry->skb);
650 kfree(entry);
651}
652
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000653static struct lowpan_fragment *
654lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag)
655{
656 struct lowpan_fragment *frame;
657
658 frame = kzalloc(sizeof(struct lowpan_fragment),
659 GFP_ATOMIC);
660 if (!frame)
661 goto frame_err;
662
663 INIT_LIST_HEAD(&frame->list);
664
665 frame->length = (iphc0 & 7) | (len << 3);
666 frame->tag = tag;
667
668 /* allocate buffer for frame assembling */
669 frame->skb = alloc_skb(frame->length +
670 sizeof(struct ipv6hdr), GFP_ATOMIC);
671
672 if (!frame->skb)
673 goto skb_err;
674
675 frame->skb->priority = skb->priority;
676 frame->skb->dev = skb->dev;
677
678 /* reserve headroom for uncompressed ipv6 header */
679 skb_reserve(frame->skb, sizeof(struct ipv6hdr));
680 skb_put(frame->skb, frame->length);
681
682 init_timer(&frame->timer);
683 /* time out is the same as for ipv6 - 60 sec */
684 frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
685 frame->timer.data = (unsigned long)frame;
686 frame->timer.function = lowpan_fragment_timer_expired;
687
688 add_timer(&frame->timer);
689
690 list_add_tail(&frame->list, &lowpan_fragments);
691
692 return frame;
693
694skb_err:
695 kfree(frame);
696frame_err:
697 return NULL;
698}
699
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700700static int
701lowpan_process_data(struct sk_buff *skb)
702{
703 struct ipv6hdr hdr;
704 u8 tmp, iphc0, iphc1, num_context = 0;
705 u8 *_saddr, *_daddr;
706 int err;
707
708 lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
709 skb->len);
710 /* at least two bytes will be used for the encoding */
711 if (skb->len < 2)
712 goto drop;
713 iphc0 = lowpan_fetch_skb_u8(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000714
715 /* fragments assembling */
716 switch (iphc0 & LOWPAN_DISPATCH_MASK) {
717 case LOWPAN_DISPATCH_FRAG1:
718 case LOWPAN_DISPATCH_FRAGN:
719 {
720 struct lowpan_fragment *frame;
721 u8 len, offset;
722 u16 tag;
723 bool found = false;
724
725 len = lowpan_fetch_skb_u8(skb); /* frame length */
726 tag = lowpan_fetch_skb_u16(skb);
727
728 /*
729 * check if frame assembling with the same tag is
730 * already in progress
731 */
732 spin_lock(&flist_lock);
733
734 list_for_each_entry(frame, &lowpan_fragments, list)
735 if (frame->tag == tag) {
736 found = true;
737 break;
738 }
739
740 /* alloc new frame structure */
741 if (!found) {
alex.bluesman.smirnov@gmail.comc2e94d72012-04-25 23:35:50 +0000742 frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000743 if (!frame)
744 goto unlock_and_drop;
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000745 }
746
747 if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
748 goto unlock_and_drop;
749
750 offset = lowpan_fetch_skb_u8(skb); /* fetch offset */
751
752 /* if payload fits buffer, copy it */
753 if (likely((offset * 8 + skb->len) <= frame->length))
754 skb_copy_to_linear_data_offset(frame->skb, offset * 8,
755 skb->data, skb->len);
756 else
757 goto unlock_and_drop;
758
759 frame->bytes_rcv += skb->len;
760
761 /* frame assembling complete */
762 if ((frame->bytes_rcv == frame->length) &&
763 frame->timer.expires > jiffies) {
764 /* if timer haven't expired - first of all delete it */
765 del_timer(&frame->timer);
766 list_del(&frame->list);
767 spin_unlock(&flist_lock);
768
769 dev_kfree_skb(skb);
770 skb = frame->skb;
771 kfree(frame);
772 iphc0 = lowpan_fetch_skb_u8(skb);
773 break;
774 }
775 spin_unlock(&flist_lock);
776
777 return kfree_skb(skb), 0;
778 }
779 default:
780 break;
781 }
782
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700783 iphc1 = lowpan_fetch_skb_u8(skb);
784
785 _saddr = mac_cb(skb)->sa.hwaddr;
786 _daddr = mac_cb(skb)->da.hwaddr;
787
788 pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1);
789
790 /* another if the CID flag is set */
791 if (iphc1 & LOWPAN_IPHC_CID) {
792 pr_debug("(%s): CID flag is set, increase header with one\n",
793 __func__);
794 if (!skb->len)
795 goto drop;
796 num_context = lowpan_fetch_skb_u8(skb);
797 }
798
799 hdr.version = 6;
800
801 /* Traffic Class and Flow Label */
802 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
803 /*
804 * Traffic Class and FLow Label carried in-line
805 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
806 */
807 case 0: /* 00b */
808 if (!skb->len)
809 goto drop;
810 tmp = lowpan_fetch_skb_u8(skb);
811 memcpy(&hdr.flow_lbl, &skb->data[0], 3);
812 skb_pull(skb, 3);
813 hdr.priority = ((tmp >> 2) & 0x0f);
814 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
815 (hdr.flow_lbl[0] & 0x0f);
816 break;
817 /*
818 * Traffic class carried in-line
819 * ECN + DSCP (1 byte), Flow Label is elided
820 */
821 case 1: /* 10b */
822 if (!skb->len)
823 goto drop;
824 tmp = lowpan_fetch_skb_u8(skb);
825 hdr.priority = ((tmp >> 2) & 0x0f);
826 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
827 hdr.flow_lbl[1] = 0;
828 hdr.flow_lbl[2] = 0;
829 break;
830 /*
831 * Flow Label carried in-line
832 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
833 */
834 case 2: /* 01b */
835 if (!skb->len)
836 goto drop;
837 tmp = lowpan_fetch_skb_u8(skb);
838 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
839 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
840 skb_pull(skb, 2);
841 break;
842 /* Traffic Class and Flow Label are elided */
843 case 3: /* 11b */
844 hdr.priority = 0;
845 hdr.flow_lbl[0] = 0;
846 hdr.flow_lbl[1] = 0;
847 hdr.flow_lbl[2] = 0;
848 break;
849 default:
850 break;
851 }
852
853 /* Next Header */
854 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
855 /* Next header is carried inline */
856 if (!skb->len)
857 goto drop;
858 hdr.nexthdr = lowpan_fetch_skb_u8(skb);
859 pr_debug("(%s): NH flag is set, next header is carried "
860 "inline: %02x\n", __func__, hdr.nexthdr);
861 }
862
863 /* Hop Limit */
864 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
865 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
866 else {
867 if (!skb->len)
868 goto drop;
869 hdr.hop_limit = lowpan_fetch_skb_u8(skb);
870 }
871
872 /* Extract SAM to the tmp variable */
873 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
874
875 /* Source address uncompression */
876 pr_debug("(%s): source address stateless compression\n", __func__);
877 err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
878 lowpan_unc_llconf[tmp], skb->data);
879 if (err)
880 goto drop;
881
882 /* Extract DAM to the tmp variable */
883 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
884
885 /* check for Multicast Compression */
886 if (iphc1 & LOWPAN_IPHC_M) {
887 if (iphc1 & LOWPAN_IPHC_DAC) {
888 pr_debug("(%s): destination address context-based "
889 "multicast compression\n", __func__);
890 /* TODO: implement this */
891 } else {
892 u8 prefix[] = {0xff, 0x02};
893
894 pr_debug("(%s): destination address non-context-based"
895 " multicast compression\n", __func__);
896 if (0 < tmp && tmp < 3) {
897 if (!skb->len)
898 goto drop;
899 else
900 prefix[1] = lowpan_fetch_skb_u8(skb);
901 }
902
903 err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
904 lowpan_unc_mxconf[tmp], NULL);
905 if (err)
906 goto drop;
907 }
908 } else {
909 pr_debug("(%s): destination address stateless compression\n",
910 __func__);
911 err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
912 lowpan_unc_llconf[tmp], skb->data);
913 if (err)
914 goto drop;
915 }
916
alex.bluesman.smirnov@gmail.comf8b1b5d2011-11-10 07:40:53 +0000917 /* UDP data uncompression */
918 if (iphc0 & LOWPAN_IPHC_NH_C)
919 if (lowpan_uncompress_udp_header(skb))
920 goto drop;
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700921
922 /* Not fragmented package */
923 hdr.payload_len = htons(skb->len);
924
925 pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__,
926 skb_headroom(skb), skb->len);
927
928 pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
929 "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version,
930 ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
931
932 lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
933 sizeof(hdr));
934 return lowpan_skb_deliver(skb, &hdr);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000935
936unlock_and_drop:
937 spin_unlock(&flist_lock);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700938drop:
Dan Carpenter90d09632011-08-30 03:45:52 +0000939 kfree_skb(skb);
Alexander Smirnov44331fe2011-08-24 19:34:42 -0700940 return -EINVAL;
941}
942
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000943static int lowpan_get_mac_header_length(struct sk_buff *skb)
944{
945 /*
946 * Currently long addressing mode is supported only, so the overall
947 * header size is 21:
948 * FC SeqNum DPAN DA SA Sec
949 * 2 + 1 + 2 + 8 + 8 + 0 = 21
950 */
951 return 21;
952}
953
954static int
955lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
956 int mlen, int plen, int offset)
957{
958 struct sk_buff *frag;
959 int hlen, ret;
960
961 /* if payload length is zero, therefore it's a first fragment */
962 hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
963
964 lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
965
966 frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
967 if (!frag)
968 return -ENOMEM;
969
970 frag->priority = skb->priority;
971 frag->dev = skb->dev;
972
973 /* copy header, MFR and payload */
974 memcpy(skb_put(frag, mlen), skb->data, mlen);
975 memcpy(skb_put(frag, hlen), head, hlen);
976
977 if (plen)
978 skb_copy_from_linear_data_offset(skb, offset + mlen,
979 skb_put(frag, plen), plen);
980
981 lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
982 frag->len);
983
984 ret = dev_queue_xmit(frag);
985
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +0000986 return ret;
987}
988
989static int
990lowpan_skb_fragmentation(struct sk_buff *skb)
991{
992 int err, header_length, payload_length, tag, offset = 0;
993 u8 head[5];
994
995 header_length = lowpan_get_mac_header_length(skb);
996 payload_length = skb->len - header_length;
997 tag = fragment_tag++;
998
999 /* first fragment header */
1000 head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
1001 head[1] = (payload_length >> 3) & 0xff;
1002 head[2] = tag & 0xff;
1003 head[3] = tag >> 8;
1004
1005 err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
1006
1007 /* next fragment header */
1008 head[0] &= ~LOWPAN_DISPATCH_FRAG1;
1009 head[0] |= LOWPAN_DISPATCH_FRAGN;
1010
1011 while ((payload_length - offset > 0) && (err >= 0)) {
1012 int len = LOWPAN_FRAG_SIZE;
1013
1014 head[4] = offset / 8;
1015
1016 if (payload_length - offset < len)
1017 len = payload_length - offset;
1018
1019 err = lowpan_fragment_xmit(skb, head, header_length,
1020 len, offset);
1021 offset += len;
1022 }
1023
1024 return err;
1025}
1026
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001027static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
1028{
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001029 int err = -1;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001030
1031 pr_debug("(%s): package xmit\n", __func__);
1032
1033 skb->dev = lowpan_dev_info(dev)->real_dev;
1034 if (skb->dev == NULL) {
1035 pr_debug("(%s) ERROR: no real wpan device found\n", __func__);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001036 goto error;
1037 }
1038
1039 if (skb->len <= IEEE802154_MTU) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001040 err = dev_queue_xmit(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001041 goto out;
1042 }
1043
1044 pr_debug("(%s): frame is too big, fragmentation is needed\n",
1045 __func__);
1046 err = lowpan_skb_fragmentation(skb);
1047error:
1048 dev_kfree_skb(skb);
1049out:
1050 if (err < 0)
1051 pr_debug("(%s): ERROR: xmit failed\n", __func__);
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001052
1053 return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
1054}
1055
1056static void lowpan_dev_free(struct net_device *dev)
1057{
1058 dev_put(lowpan_dev_info(dev)->real_dev);
1059 free_netdev(dev);
1060}
1061
1062static struct header_ops lowpan_header_ops = {
1063 .create = lowpan_header_create,
1064};
1065
1066static const struct net_device_ops lowpan_netdev_ops = {
1067 .ndo_start_xmit = lowpan_xmit,
Danny Kukawkacdf49c22012-02-22 02:36:39 +00001068 .ndo_set_mac_address = eth_mac_addr,
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001069};
1070
1071static void lowpan_setup(struct net_device *dev)
1072{
1073 pr_debug("(%s)\n", __func__);
1074
1075 dev->addr_len = IEEE802154_ADDR_LEN;
1076 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
1077 dev->type = ARPHRD_IEEE802154;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001078 /* Frame Control + Sequence Number + Address fields + Security Header */
1079 dev->hard_header_len = 2 + 1 + 20 + 14;
1080 dev->needed_tailroom = 2; /* FCS */
1081 dev->mtu = 1281;
1082 dev->tx_queue_len = 0;
alex.bluesman.smirnov@gmail.com4d039f62011-11-10 07:39:37 +00001083 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001084 dev->watchdog_timeo = 0;
1085
1086 dev->netdev_ops = &lowpan_netdev_ops;
1087 dev->header_ops = &lowpan_header_ops;
1088 dev->destructor = lowpan_dev_free;
1089}
1090
1091static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
1092{
1093 pr_debug("(%s)\n", __func__);
1094
1095 if (tb[IFLA_ADDRESS]) {
1096 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
1097 return -EINVAL;
1098 }
1099 return 0;
1100}
1101
1102static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
1103 struct packet_type *pt, struct net_device *orig_dev)
1104{
1105 if (!netif_running(dev))
1106 goto drop;
1107
1108 if (dev->type != ARPHRD_IEEE802154)
1109 goto drop;
1110
1111 /* check that it's our buffer */
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001112 switch (skb->data[0] & 0xe0) {
1113 case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
1114 case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
1115 case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001116 lowpan_process_data(skb);
alex.bluesman.smirnov@gmail.com719269a2011-11-10 07:38:38 +00001117 break;
1118 default:
1119 break;
1120 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001121
1122 return NET_RX_SUCCESS;
1123
1124drop:
1125 kfree_skb(skb);
1126 return NET_RX_DROP;
1127}
1128
1129static int lowpan_newlink(struct net *src_net, struct net_device *dev,
1130 struct nlattr *tb[], struct nlattr *data[])
1131{
1132 struct net_device *real_dev;
1133 struct lowpan_dev_record *entry;
1134
1135 pr_debug("(%s)\n", __func__);
1136
1137 if (!tb[IFLA_LINK])
1138 return -EINVAL;
1139 /* find and hold real wpan device */
1140 real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1141 if (!real_dev)
1142 return -ENODEV;
1143
1144 lowpan_dev_info(dev)->real_dev = real_dev;
1145 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
1146
1147 entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001148 if (!entry) {
1149 dev_put(real_dev);
1150 lowpan_dev_info(dev)->real_dev = NULL;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001151 return -ENOMEM;
Dan Carpenterdc00fd42011-08-30 03:51:09 +00001152 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001153
1154 entry->ldev = dev;
1155
1156 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
1157 INIT_LIST_HEAD(&entry->list);
1158 list_add_tail(&entry->list, &lowpan_devices);
1159 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1160
1161 register_netdevice(dev);
1162
1163 return 0;
1164}
1165
1166static void lowpan_dellink(struct net_device *dev, struct list_head *head)
1167{
1168 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
1169 struct net_device *real_dev = lowpan_dev->real_dev;
1170 struct lowpan_dev_record *entry;
Dan Carpenteraec9db32011-08-30 03:46:40 +00001171 struct lowpan_dev_record *tmp;
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001172
1173 ASSERT_RTNL();
1174
1175 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
Dan Carpenteraec9db32011-08-30 03:46:40 +00001176 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001177 if (entry->ldev == dev) {
1178 list_del(&entry->list);
1179 kfree(entry);
1180 }
Dan Carpenteraec9db32011-08-30 03:46:40 +00001181 }
Alexander Smirnov44331fe2011-08-24 19:34:42 -07001182 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
1183
1184 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
1185
1186 unregister_netdevice_queue(dev, head);
1187
1188 dev_put(real_dev);
1189}
1190
1191static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
1192 .kind = "lowpan",
1193 .priv_size = sizeof(struct lowpan_dev_info),
1194 .setup = lowpan_setup,
1195 .newlink = lowpan_newlink,
1196 .dellink = lowpan_dellink,
1197 .validate = lowpan_validate,
1198};
1199
1200static inline int __init lowpan_netlink_init(void)
1201{
1202 return rtnl_link_register(&lowpan_link_ops);
1203}
1204
1205static inline void __init lowpan_netlink_fini(void)
1206{
1207 rtnl_link_unregister(&lowpan_link_ops);
1208}
1209
1210static struct packet_type lowpan_packet_type = {
1211 .type = __constant_htons(ETH_P_IEEE802154),
1212 .func = lowpan_rcv,
1213};
1214
1215static int __init lowpan_init_module(void)
1216{
1217 int err = 0;
1218
1219 pr_debug("(%s)\n", __func__);
1220
1221 err = lowpan_netlink_init();
1222 if (err < 0)
1223 goto out;
1224
1225 dev_add_pack(&lowpan_packet_type);
1226out:
1227 return err;
1228}
1229
1230static void __exit lowpan_cleanup_module(void)
1231{
1232 pr_debug("(%s)\n", __func__);
1233
1234 lowpan_netlink_fini();
1235
1236 dev_remove_pack(&lowpan_packet_type);
1237}
1238
1239module_init(lowpan_init_module);
1240module_exit(lowpan_cleanup_module);
1241MODULE_LICENSE("GPL");
1242MODULE_ALIAS_RTNL_LINK("lowpan");