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44331fe2 AS |
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 | ||
44331fe2 AS |
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 | ||
44331fe2 AS |
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 */ | |
ababf385 | 74 | unsigned short fragment_tag; |
44331fe2 AS |
75 | }; |
76 | ||
77 | struct lowpan_dev_record { | |
78 | struct net_device *ldev; | |
79 | struct list_head list; | |
80 | }; | |
81 | ||
719269af | 82 | struct lowpan_fragment { |
83 | struct sk_buff *skb; /* skb to be assembled */ | |
719269af | 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 | ||
719269af | 91 | static LIST_HEAD(lowpan_fragments); |
4d27de14 | 92 | static DEFINE_SPINLOCK(flist_lock); |
719269af | 93 | |
44331fe2 AS |
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 | ||
44331fe2 | 161 | /* |
ce2463b2 AA |
162 | * Uncompress address function for source and |
163 | * destination address(non-multicast). | |
164 | * | |
165 | * address_mode is sam value or dam value. | |
44331fe2 AS |
166 | */ |
167 | static int | |
ce2463b2 AA |
168 | lowpan_uncompress_addr(struct sk_buff *skb, |
169 | struct in6_addr *ipaddr, | |
170 | const u8 address_mode, | |
171 | const struct ieee802154_addr *lladdr) | |
44331fe2 | 172 | { |
ce2463b2 AA |
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"); | |
44331fe2 | 226 | return -EINVAL; |
ce2463b2 AA |
227 | } |
228 | break; | |
229 | default: | |
230 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
231 | return -EINVAL; | |
232 | } | |
44331fe2 | 233 | |
ce2463b2 AA |
234 | if (fail) { |
235 | pr_debug("Failed to fetch skb data\n"); | |
236 | return -EIO; | |
44331fe2 AS |
237 | } |
238 | ||
ce2463b2 AA |
239 | lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 addr is:\n", |
240 | ipaddr->s6_addr, 16); | |
44331fe2 AS |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
65d892c8 AA |
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 | ||
84c2e7bc AA |
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 | ||
3bd5b958 | 336 | static void |
337 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
338 | { | |
339 | struct udphdr *uh = udp_hdr(skb); | |
340 | ||
3bd5b958 | 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)) { | |
e71094f9 | 345 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
3bd5b958 | 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) { | |
e71094f9 | 353 | pr_debug("UDP header: remove 8 bits of dest\n"); |
3bd5b958 | 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) { | |
e71094f9 | 360 | pr_debug("UDP header: remove 8 bits of source\n"); |
3bd5b958 | 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 { | |
e71094f9 | 366 | pr_debug("UDP header: can't compress\n"); |
3bd5b958 | 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; | |
24363b67 TC |
376 | |
377 | /* skip the UDP header */ | |
378 | skb_pull(skb, sizeof(struct udphdr)); | |
3bd5b958 | 379 | } |
380 | ||
c5d3687f | 381 | static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) |
44331fe2 | 382 | { |
c5d3687f | 383 | if (unlikely(!pskb_may_pull(skb, 1))) |
384 | return -EINVAL; | |
44331fe2 | 385 | |
c5d3687f | 386 | *val = skb->data[0]; |
44331fe2 AS |
387 | skb_pull(skb, 1); |
388 | ||
c5d3687f | 389 | return 0; |
44331fe2 AS |
390 | } |
391 | ||
c5d3687f | 392 | static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) |
719269af | 393 | { |
c5d3687f | 394 | if (unlikely(!pskb_may_pull(skb, 2))) |
395 | return -EINVAL; | |
719269af | 396 | |
4576039f | 397 | *val = (skb->data[0] << 8) | skb->data[1]; |
719269af | 398 | skb_pull(skb, 2); |
c5d3687f | 399 | |
400 | return 0; | |
719269af | 401 | } |
402 | ||
f8b1b5d2 | 403 | static int |
24363b67 | 404 | lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) |
f8b1b5d2 | 405 | { |
f8b1b5d2 | 406 | u8 tmp; |
407 | ||
d4787a15 TC |
408 | if (!uh) |
409 | goto err; | |
410 | ||
c5d3687f | 411 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
412 | goto err; | |
f8b1b5d2 | 413 | |
414 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
e71094f9 | 415 | pr_debug("UDP header uncompression\n"); |
f8b1b5d2 | 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: | |
e71094f9 | 441 | pr_debug("ERROR: unknown UDP format\n"); |
f8b1b5d2 | 442 | goto err; |
f8b1b5d2 | 443 | } |
444 | ||
e71094f9 | 445 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", |
446 | uh->source, uh->dest); | |
f8b1b5d2 | 447 | |
448 | /* copy checksum */ | |
449 | memcpy(&uh->check, &skb->data[0], 2); | |
450 | skb_pull(skb, 2); | |
24363b67 TC |
451 | |
452 | /* | |
453 | * UDP lenght needs to be infered from the lower layers | |
454 | * here, we obtain the hint from the remaining size of the | |
455 | * frame | |
456 | */ | |
457 | uh->len = htons(skb->len + sizeof(struct udphdr)); | |
458 | pr_debug("uncompressed UDP length: src = %d", uh->len); | |
f8b1b5d2 | 459 | } else { |
e71094f9 | 460 | pr_debug("ERROR: unsupported NH format\n"); |
f8b1b5d2 | 461 | goto err; |
462 | } | |
463 | ||
464 | return 0; | |
465 | err: | |
466 | return -EINVAL; | |
467 | } | |
468 | ||
44331fe2 AS |
469 | static int lowpan_header_create(struct sk_buff *skb, |
470 | struct net_device *dev, | |
471 | unsigned short type, const void *_daddr, | |
95c96174 | 472 | const void *_saddr, unsigned int len) |
44331fe2 AS |
473 | { |
474 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
475 | struct ipv6hdr *hdr; | |
476 | const u8 *saddr = _saddr; | |
477 | const u8 *daddr = _daddr; | |
fc4e98db | 478 | u8 head[100]; |
44331fe2 AS |
479 | struct ieee802154_addr sa, da; |
480 | ||
fc4e98db AA |
481 | /* TODO: |
482 | * if this package isn't ipv6 one, where should it be routed? | |
483 | */ | |
44331fe2 AS |
484 | if (type != ETH_P_IPV6) |
485 | return 0; | |
44331fe2 AS |
486 | |
487 | hdr = ipv6_hdr(skb); | |
488 | hc06_ptr = head + 2; | |
489 | ||
e71094f9 | 490 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
491 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version, | |
492 | ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit); | |
44331fe2 AS |
493 | |
494 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
495 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
496 | ||
497 | if (!saddr) | |
498 | saddr = dev->dev_addr; | |
499 | ||
500 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
501 | ||
502 | /* | |
503 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
504 | * we sometimes use |= | |
505 | * If the field is 0, and the current bit value in memory is 1, | |
506 | * this does not work. We therefore reset the IPHC encoding here | |
507 | */ | |
508 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
509 | iphc1 = 0; | |
510 | ||
511 | /* TODO: context lookup */ | |
512 | ||
513 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
514 | ||
515 | /* | |
516 | * Traffic class, flow label | |
517 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
518 | * We have to process both in the same time as the offset of traffic | |
519 | * class depends on the presence of version and flow label | |
520 | */ | |
521 | ||
522 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
523 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
524 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
525 | ||
526 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
527 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
528 | /* flow label can be compressed */ | |
529 | iphc0 |= LOWPAN_IPHC_FL_C; | |
530 | if ((hdr->priority == 0) && | |
531 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
532 | /* compress (elide) all */ | |
533 | iphc0 |= LOWPAN_IPHC_TC_C; | |
534 | } else { | |
535 | /* compress only the flow label */ | |
536 | *hc06_ptr = tmp; | |
537 | hc06_ptr += 1; | |
538 | } | |
539 | } else { | |
540 | /* Flow label cannot be compressed */ | |
541 | if ((hdr->priority == 0) && | |
542 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
543 | /* compress only traffic class */ | |
544 | iphc0 |= LOWPAN_IPHC_TC_C; | |
545 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
546 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
547 | hc06_ptr += 3; | |
548 | } else { | |
549 | /* compress nothing */ | |
550 | memcpy(hc06_ptr, &hdr, 4); | |
551 | /* replace the top byte with new ECN | DSCP format */ | |
552 | *hc06_ptr = tmp; | |
553 | hc06_ptr += 4; | |
554 | } | |
555 | } | |
556 | ||
557 | /* NOTE: payload length is always compressed */ | |
558 | ||
559 | /* Next Header is compress if UDP */ | |
560 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
561 | iphc0 |= LOWPAN_IPHC_NH_C; | |
562 | ||
44331fe2 AS |
563 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
564 | *hc06_ptr = hdr->nexthdr; | |
565 | hc06_ptr += 1; | |
566 | } | |
567 | ||
568 | /* | |
569 | * Hop limit | |
570 | * if 1: compress, encoding is 01 | |
571 | * if 64: compress, encoding is 10 | |
572 | * if 255: compress, encoding is 11 | |
573 | * else do not compress | |
574 | */ | |
575 | switch (hdr->hop_limit) { | |
576 | case 1: | |
577 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
578 | break; | |
579 | case 64: | |
580 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
581 | break; | |
582 | case 255: | |
583 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
584 | break; | |
585 | default: | |
586 | *hc06_ptr = hdr->hop_limit; | |
5c00c0cb | 587 | hc06_ptr += 1; |
44331fe2 AS |
588 | break; |
589 | } | |
590 | ||
591 | /* source address compression */ | |
592 | if (is_addr_unspecified(&hdr->saddr)) { | |
e71094f9 | 593 | pr_debug("source address is unspecified, setting SAC\n"); |
44331fe2 AS |
594 | iphc1 |= LOWPAN_IPHC_SAC; |
595 | /* TODO: context lookup */ | |
596 | } else if (is_addr_link_local(&hdr->saddr)) { | |
e71094f9 | 597 | pr_debug("source address is link-local\n"); |
44331fe2 AS |
598 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
599 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
600 | } else { | |
e71094f9 | 601 | pr_debug("send the full source address\n"); |
44331fe2 AS |
602 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
603 | hc06_ptr += 16; | |
604 | } | |
605 | ||
606 | /* destination address compression */ | |
607 | if (is_addr_mcast(&hdr->daddr)) { | |
e71094f9 | 608 | pr_debug("destination address is multicast: "); |
44331fe2 AS |
609 | iphc1 |= LOWPAN_IPHC_M; |
610 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
611 | pr_debug("compressed to 1 octet\n"); | |
612 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
613 | /* use last byte */ | |
614 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
615 | hc06_ptr += 1; | |
616 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
617 | pr_debug("compressed to 4 octets\n"); | |
618 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
619 | /* second byte + the last three */ | |
620 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
621 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
622 | hc06_ptr += 4; | |
623 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
624 | pr_debug("compressed to 6 octets\n"); | |
625 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
626 | /* second byte + the last five */ | |
627 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
628 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
629 | hc06_ptr += 6; | |
630 | } else { | |
631 | pr_debug("using full address\n"); | |
632 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
633 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
634 | hc06_ptr += 16; | |
635 | } | |
636 | } else { | |
44331fe2 AS |
637 | /* TODO: context lookup */ |
638 | if (is_addr_link_local(&hdr->daddr)) { | |
e71094f9 | 639 | pr_debug("dest address is unicast and link-local\n"); |
44331fe2 AS |
640 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
641 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
642 | } else { | |
e71094f9 | 643 | pr_debug("dest address is unicast: using full one\n"); |
44331fe2 AS |
644 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
645 | hc06_ptr += 16; | |
646 | } | |
647 | } | |
648 | ||
3bd5b958 | 649 | /* UDP header compression */ |
650 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
651 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
652 | |
653 | head[0] = iphc0; | |
654 | head[1] = iphc1; | |
655 | ||
656 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
578d5241 | 657 | skb_reset_transport_header(skb); |
44331fe2 | 658 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); |
578d5241 | 659 | skb_reset_network_header(skb); |
44331fe2 | 660 | |
44331fe2 AS |
661 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, |
662 | skb->len); | |
663 | ||
664 | /* | |
665 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
666 | * header are created here and not later in the xmit. So wait for | |
667 | * an opinion of net maintainers. | |
668 | */ | |
669 | /* | |
670 | * NOTE2: to be absolutely correct, we must derive PANid information | |
671 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
672 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
673 | */ | |
674 | { | |
58ef67c3 | 675 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
c7d0ab28 | 676 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); |
58ef67c3 | 677 | |
44331fe2 AS |
678 | /* prepare wpan address data */ |
679 | sa.addr_type = IEEE802154_ADDR_LONG; | |
43de7aa6 TC |
680 | sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); |
681 | ||
44331fe2 | 682 | memcpy(&(sa.hwaddr), saddr, 8); |
43de7aa6 TC |
683 | /* intra-PAN communications */ |
684 | da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
44331fe2 | 685 | |
58ef67c3 TC |
686 | /* |
687 | * if the destination address is the broadcast address, use the | |
688 | * corresponding short address | |
689 | */ | |
690 | if (lowpan_is_addr_broadcast(daddr)) { | |
691 | da.addr_type = IEEE802154_ADDR_SHORT; | |
692 | da.short_addr = IEEE802154_ADDR_BROADCAST; | |
693 | } else { | |
694 | da.addr_type = IEEE802154_ADDR_LONG; | |
6bdeaba4 | 695 | memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN); |
719269af | 696 | |
58ef67c3 | 697 | /* request acknowledgment */ |
f333a15a | 698 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; |
58ef67c3 | 699 | } |
f333a15a | 700 | |
44331fe2 AS |
701 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
702 | type, (void *)&da, (void *)&sa, skb->len); | |
703 | } | |
704 | } | |
705 | ||
0c446212 AO |
706 | static int lowpan_give_skb_to_devices(struct sk_buff *skb) |
707 | { | |
708 | struct lowpan_dev_record *entry; | |
709 | struct sk_buff *skb_cp; | |
710 | int stat = NET_RX_SUCCESS; | |
711 | ||
712 | rcu_read_lock(); | |
713 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
714 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
715 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
716 | if (!skb_cp) { | |
717 | stat = -ENOMEM; | |
718 | break; | |
719 | } | |
720 | ||
721 | skb_cp->dev = entry->ldev; | |
722 | stat = netif_rx(skb_cp); | |
723 | } | |
724 | rcu_read_unlock(); | |
725 | ||
726 | return stat; | |
727 | } | |
728 | ||
44331fe2 AS |
729 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) |
730 | { | |
731 | struct sk_buff *new; | |
44331fe2 AS |
732 | int stat = NET_RX_SUCCESS; |
733 | ||
734 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 735 | GFP_ATOMIC); |
44331fe2 AS |
736 | kfree_skb(skb); |
737 | ||
dcef1151 | 738 | if (!new) |
44331fe2 AS |
739 | return -ENOMEM; |
740 | ||
741 | skb_push(new, sizeof(struct ipv6hdr)); | |
44331fe2 AS |
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 | ||
0c446212 | 747 | stat = lowpan_give_skb_to_devices(new); |
44331fe2 AS |
748 | |
749 | kfree_skb(new); | |
750 | ||
751 | return stat; | |
752 | } | |
753 | ||
719269af | 754 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
755 | { | |
756 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
757 | ||
e71094f9 | 758 | pr_debug("timer expired for frame with tag %d\n", entry->tag); |
719269af | 759 | |
719269af | 760 | list_del(&entry->list); |
719269af | 761 | dev_kfree_skb(entry->skb); |
762 | kfree(entry); | |
763 | } | |
764 | ||
c2e94d73 | 765 | static struct lowpan_fragment * |
d991b98f | 766 | lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag) |
c2e94d73 | 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 | ||
5e96855f | 777 | frame->length = len; |
c2e94d73 | 778 | frame->tag = tag; |
779 | ||
780 | /* allocate buffer for frame assembling */ | |
79ff1db6 | 781 | frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length + |
782 | sizeof(struct ipv6hdr)); | |
c2e94d73 | 783 | |
784 | if (!frame->skb) | |
785 | goto skb_err; | |
786 | ||
787 | frame->skb->priority = skb->priority; | |
c2e94d73 | 788 | |
789 | /* reserve headroom for uncompressed ipv6 header */ | |
790 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
791 | skb_put(frame->skb, frame->length); | |
792 | ||
31afe1f7 DH |
793 | /* copy the first control block to keep a |
794 | * trace of the link-layer addresses in case | |
795 | * of a link-local compressed address | |
796 | */ | |
797 | memcpy(frame->skb->cb, skb->cb, sizeof(skb->cb)); | |
798 | ||
c2e94d73 | 799 | init_timer(&frame->timer); |
800 | /* time out is the same as for ipv6 - 60 sec */ | |
801 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
802 | frame->timer.data = (unsigned long)frame; | |
803 | frame->timer.function = lowpan_fragment_timer_expired; | |
804 | ||
805 | add_timer(&frame->timer); | |
806 | ||
807 | list_add_tail(&frame->list, &lowpan_fragments); | |
808 | ||
809 | return frame; | |
810 | ||
811 | skb_err: | |
812 | kfree(frame); | |
813 | frame_err: | |
814 | return NULL; | |
815 | } | |
816 | ||
44331fe2 AS |
817 | static int |
818 | lowpan_process_data(struct sk_buff *skb) | |
819 | { | |
84ce1ddf | 820 | struct ipv6hdr hdr = {}; |
44331fe2 | 821 | u8 tmp, iphc0, iphc1, num_context = 0; |
ce2463b2 | 822 | const struct ieee802154_addr *_saddr, *_daddr; |
44331fe2 AS |
823 | int err; |
824 | ||
825 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
826 | skb->len); | |
827 | /* at least two bytes will be used for the encoding */ | |
828 | if (skb->len < 2) | |
829 | goto drop; | |
c5d3687f | 830 | |
831 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
832 | goto drop; | |
719269af | 833 | |
834 | /* fragments assembling */ | |
835 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
836 | case LOWPAN_DISPATCH_FRAG1: | |
837 | case LOWPAN_DISPATCH_FRAGN: | |
838 | { | |
839 | struct lowpan_fragment *frame; | |
5e96855f | 840 | /* slen stores the rightmost 8 bits of the 11 bits length */ |
d991b98f | 841 | u8 slen, offset = 0; |
5e96855f | 842 | u16 len, tag; |
719269af | 843 | bool found = false; |
844 | ||
5e96855f | 845 | if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */ |
c5d3687f | 846 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ |
847 | goto drop; | |
719269af | 848 | |
5e96855f TC |
849 | /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */ |
850 | len = ((iphc0 & 7) << 8) | slen; | |
851 | ||
9da2924c TC |
852 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) { |
853 | pr_debug("%s received a FRAG1 packet (tag: %d, " | |
854 | "size of the entire IP packet: %d)", | |
855 | __func__, tag, len); | |
856 | } else { /* FRAGN */ | |
d991b98f TC |
857 | if (lowpan_fetch_skb_u8(skb, &offset)) |
858 | goto unlock_and_drop; | |
9da2924c TC |
859 | pr_debug("%s received a FRAGN packet (tag: %d, " |
860 | "size of the entire IP packet: %d, " | |
861 | "offset: %d)", __func__, tag, len, offset * 8); | |
d991b98f TC |
862 | } |
863 | ||
719269af | 864 | /* |
865 | * check if frame assembling with the same tag is | |
866 | * already in progress | |
867 | */ | |
33c34c5e | 868 | spin_lock_bh(&flist_lock); |
719269af | 869 | |
870 | list_for_each_entry(frame, &lowpan_fragments, list) | |
871 | if (frame->tag == tag) { | |
872 | found = true; | |
873 | break; | |
874 | } | |
875 | ||
876 | /* alloc new frame structure */ | |
877 | if (!found) { | |
9da2924c TC |
878 | pr_debug("%s first fragment received for tag %d, " |
879 | "begin packet reassembly", __func__, tag); | |
5e96855f | 880 | frame = lowpan_alloc_new_frame(skb, len, tag); |
719269af | 881 | if (!frame) |
882 | goto unlock_and_drop; | |
719269af | 883 | } |
884 | ||
719269af | 885 | /* if payload fits buffer, copy it */ |
886 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
887 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
888 | skb->data, skb->len); | |
889 | else | |
890 | goto unlock_and_drop; | |
891 | ||
892 | frame->bytes_rcv += skb->len; | |
893 | ||
894 | /* frame assembling complete */ | |
895 | if ((frame->bytes_rcv == frame->length) && | |
896 | frame->timer.expires > jiffies) { | |
897 | /* if timer haven't expired - first of all delete it */ | |
33c34c5e | 898 | del_timer_sync(&frame->timer); |
719269af | 899 | list_del(&frame->list); |
33c34c5e | 900 | spin_unlock_bh(&flist_lock); |
719269af | 901 | |
9da2924c TC |
902 | pr_debug("%s successfully reassembled fragment " |
903 | "(tag %d)", __func__, tag); | |
904 | ||
719269af | 905 | dev_kfree_skb(skb); |
906 | skb = frame->skb; | |
907 | kfree(frame); | |
c5d3687f | 908 | |
909 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
747cf6ed | 910 | goto drop; |
c5d3687f | 911 | |
719269af | 912 | break; |
913 | } | |
33c34c5e | 914 | spin_unlock_bh(&flist_lock); |
719269af | 915 | |
916 | return kfree_skb(skb), 0; | |
917 | } | |
918 | default: | |
919 | break; | |
920 | } | |
921 | ||
c5d3687f | 922 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
923 | goto drop; | |
44331fe2 | 924 | |
ce2463b2 AA |
925 | _saddr = &mac_cb(skb)->sa; |
926 | _daddr = &mac_cb(skb)->da; | |
44331fe2 | 927 | |
e71094f9 | 928 | pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1); |
44331fe2 AS |
929 | |
930 | /* another if the CID flag is set */ | |
931 | if (iphc1 & LOWPAN_IPHC_CID) { | |
e71094f9 | 932 | pr_debug("CID flag is set, increase header with one\n"); |
c5d3687f | 933 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 934 | goto drop; |
44331fe2 AS |
935 | } |
936 | ||
937 | hdr.version = 6; | |
938 | ||
939 | /* Traffic Class and Flow Label */ | |
940 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
941 | /* | |
942 | * Traffic Class and FLow Label carried in-line | |
943 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
944 | */ | |
945 | case 0: /* 00b */ | |
c5d3687f | 946 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 947 | goto drop; |
c5d3687f | 948 | |
44331fe2 AS |
949 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
950 | skb_pull(skb, 3); | |
951 | hdr.priority = ((tmp >> 2) & 0x0f); | |
952 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
953 | (hdr.flow_lbl[0] & 0x0f); | |
954 | break; | |
955 | /* | |
956 | * Traffic class carried in-line | |
957 | * ECN + DSCP (1 byte), Flow Label is elided | |
958 | */ | |
959 | case 1: /* 10b */ | |
c5d3687f | 960 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 961 | goto drop; |
c5d3687f | 962 | |
44331fe2 AS |
963 | hdr.priority = ((tmp >> 2) & 0x0f); |
964 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
44331fe2 AS |
965 | break; |
966 | /* | |
967 | * Flow Label carried in-line | |
968 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
969 | */ | |
970 | case 2: /* 01b */ | |
c5d3687f | 971 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 972 | goto drop; |
c5d3687f | 973 | |
44331fe2 AS |
974 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
975 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
976 | skb_pull(skb, 2); | |
977 | break; | |
978 | /* Traffic Class and Flow Label are elided */ | |
979 | case 3: /* 11b */ | |
44331fe2 AS |
980 | break; |
981 | default: | |
982 | break; | |
983 | } | |
984 | ||
985 | /* Next Header */ | |
986 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
987 | /* Next header is carried inline */ | |
c5d3687f | 988 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 989 | goto drop; |
c5d3687f | 990 | |
e71094f9 | 991 | pr_debug("NH flag is set, next header carried inline: %02x\n", |
992 | hdr.nexthdr); | |
44331fe2 AS |
993 | } |
994 | ||
995 | /* Hop Limit */ | |
996 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
997 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
998 | else { | |
c5d3687f | 999 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 1000 | goto drop; |
44331fe2 AS |
1001 | } |
1002 | ||
1003 | /* Extract SAM to the tmp variable */ | |
1004 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
1005 | ||
65d892c8 AA |
1006 | if (iphc1 & LOWPAN_IPHC_SAC) { |
1007 | /* Source address context based uncompression */ | |
1008 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
1009 | err = lowpan_uncompress_context_based_src_addr( | |
1010 | skb, &hdr.saddr, tmp); | |
1011 | } else { | |
1012 | /* Source address uncompression */ | |
1013 | pr_debug("source address stateless compression\n"); | |
1014 | err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr); | |
1015 | } | |
1016 | ||
1017 | /* Check on error of previous branch */ | |
44331fe2 AS |
1018 | if (err) |
1019 | goto drop; | |
1020 | ||
1021 | /* Extract DAM to the tmp variable */ | |
1022 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
1023 | ||
1024 | /* check for Multicast Compression */ | |
1025 | if (iphc1 & LOWPAN_IPHC_M) { | |
1026 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
e71094f9 | 1027 | pr_debug("dest: context-based mcast compression\n"); |
44331fe2 AS |
1028 | /* TODO: implement this */ |
1029 | } else { | |
84c2e7bc AA |
1030 | err = lowpan_uncompress_multicast_daddr( |
1031 | skb, &hdr.daddr, tmp); | |
44331fe2 AS |
1032 | if (err) |
1033 | goto drop; | |
1034 | } | |
1035 | } else { | |
e71094f9 | 1036 | pr_debug("dest: stateless compression\n"); |
ce2463b2 | 1037 | err = lowpan_uncompress_addr(skb, &hdr.daddr, tmp, _daddr); |
44331fe2 AS |
1038 | if (err) |
1039 | goto drop; | |
1040 | } | |
1041 | ||
f8b1b5d2 | 1042 | /* UDP data uncompression */ |
f5c20f58 | 1043 | if (iphc0 & LOWPAN_IPHC_NH_C) { |
24363b67 TC |
1044 | struct udphdr uh; |
1045 | struct sk_buff *new; | |
1046 | if (lowpan_uncompress_udp_header(skb, &uh)) | |
f8b1b5d2 | 1047 | goto drop; |
24363b67 TC |
1048 | |
1049 | /* | |
1050 | * replace the compressed UDP head by the uncompressed UDP | |
1051 | * header | |
1052 | */ | |
1053 | new = skb_copy_expand(skb, sizeof(struct udphdr), | |
1054 | skb_tailroom(skb), GFP_ATOMIC); | |
1055 | kfree_skb(skb); | |
1056 | ||
1057 | if (!new) | |
1058 | return -ENOMEM; | |
1059 | ||
1060 | skb = new; | |
1061 | ||
1062 | skb_push(skb, sizeof(struct udphdr)); | |
24363b67 TC |
1063 | skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr)); |
1064 | ||
1065 | lowpan_raw_dump_table(__func__, "raw UDP header dump", | |
1066 | (u8 *)&uh, sizeof(uh)); | |
1067 | ||
f5c20f58 TC |
1068 | hdr.nexthdr = UIP_PROTO_UDP; |
1069 | } | |
44331fe2 AS |
1070 | |
1071 | /* Not fragmented package */ | |
1072 | hdr.payload_len = htons(skb->len); | |
1073 | ||
e71094f9 | 1074 | pr_debug("skb headroom size = %d, data length = %d\n", |
1075 | skb_headroom(skb), skb->len); | |
44331fe2 | 1076 | |
e71094f9 | 1077 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
1078 | "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version, | |
44331fe2 AS |
1079 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
1080 | ||
1081 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
1082 | sizeof(hdr)); | |
1083 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 1084 | |
1085 | unlock_and_drop: | |
33c34c5e | 1086 | spin_unlock_bh(&flist_lock); |
44331fe2 | 1087 | drop: |
90d0963d | 1088 | kfree_skb(skb); |
44331fe2 AS |
1089 | return -EINVAL; |
1090 | } | |
1091 | ||
42c36295 | 1092 | static int lowpan_set_address(struct net_device *dev, void *p) |
1093 | { | |
1094 | struct sockaddr *sa = p; | |
1095 | ||
1096 | if (netif_running(dev)) | |
1097 | return -EBUSY; | |
1098 | ||
1099 | /* TODO: validate addr */ | |
1100 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
719269af | 1105 | static int |
1106 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
d991b98f | 1107 | int mlen, int plen, int offset, int type) |
719269af | 1108 | { |
1109 | struct sk_buff *frag; | |
545f3613 | 1110 | int hlen; |
719269af | 1111 | |
d991b98f TC |
1112 | hlen = (type == LOWPAN_DISPATCH_FRAG1) ? |
1113 | LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE; | |
719269af | 1114 | |
1115 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
1116 | ||
b614442f AA |
1117 | frag = netdev_alloc_skb(skb->dev, |
1118 | hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
719269af | 1119 | if (!frag) |
1120 | return -ENOMEM; | |
1121 | ||
1122 | frag->priority = skb->priority; | |
719269af | 1123 | |
1124 | /* copy header, MFR and payload */ | |
1125 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
1126 | memcpy(skb_put(frag, hlen), head, hlen); | |
1127 | ||
1128 | if (plen) | |
1129 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
1130 | skb_put(frag, plen), plen); | |
1131 | ||
1132 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
1133 | frag->len); | |
1134 | ||
545f3613 | 1135 | return dev_queue_xmit(frag); |
719269af | 1136 | } |
1137 | ||
1138 | static int | |
d4ac3236 | 1139 | lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev) |
719269af | 1140 | { |
1141 | int err, header_length, payload_length, tag, offset = 0; | |
1142 | u8 head[5]; | |
1143 | ||
3e69162e | 1144 | header_length = skb->mac_len; |
719269af | 1145 | payload_length = skb->len - header_length; |
d4ac3236 | 1146 | tag = lowpan_dev_info(dev)->fragment_tag++; |
719269af | 1147 | |
1148 | /* first fragment header */ | |
5e96855f TC |
1149 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7); |
1150 | head[1] = payload_length & 0xff; | |
4576039f TC |
1151 | head[2] = tag >> 8; |
1152 | head[3] = tag & 0xff; | |
719269af | 1153 | |
d991b98f TC |
1154 | err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE, |
1155 | 0, LOWPAN_DISPATCH_FRAG1); | |
1156 | ||
9da2924c TC |
1157 | if (err) { |
1158 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
1159 | __func__, tag); | |
d991b98f | 1160 | goto exit; |
9da2924c | 1161 | } |
d991b98f TC |
1162 | |
1163 | offset = LOWPAN_FRAG_SIZE; | |
719269af | 1164 | |
1165 | /* next fragment header */ | |
1166 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1167 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1168 | ||
53cb5717 | 1169 | while (payload_length - offset > 0) { |
719269af | 1170 | int len = LOWPAN_FRAG_SIZE; |
1171 | ||
1172 | head[4] = offset / 8; | |
1173 | ||
1174 | if (payload_length - offset < len) | |
1175 | len = payload_length - offset; | |
1176 | ||
1177 | err = lowpan_fragment_xmit(skb, head, header_length, | |
d991b98f | 1178 | len, offset, LOWPAN_DISPATCH_FRAGN); |
9da2924c TC |
1179 | if (err) { |
1180 | pr_debug("%s unable to send a subsequent FRAGN packet " | |
1181 | "(tag: %d, offset: %d", __func__, tag, offset); | |
d991b98f | 1182 | goto exit; |
9da2924c | 1183 | } |
d991b98f | 1184 | |
719269af | 1185 | offset += len; |
1186 | } | |
1187 | ||
d991b98f | 1188 | exit: |
719269af | 1189 | return err; |
1190 | } | |
1191 | ||
44331fe2 AS |
1192 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1193 | { | |
719269af | 1194 | int err = -1; |
44331fe2 | 1195 | |
e71094f9 | 1196 | pr_debug("package xmit\n"); |
44331fe2 AS |
1197 | |
1198 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1199 | if (skb->dev == NULL) { | |
e71094f9 | 1200 | pr_debug("ERROR: no real wpan device found\n"); |
719269af | 1201 | goto error; |
1202 | } | |
1203 | ||
b333b7e6 AO |
1204 | /* Send directly if less than the MTU minus the 2 checksum bytes. */ |
1205 | if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) { | |
44331fe2 | 1206 | err = dev_queue_xmit(skb); |
719269af | 1207 | goto out; |
1208 | } | |
1209 | ||
e71094f9 | 1210 | pr_debug("frame is too big, fragmentation is needed\n"); |
d4ac3236 | 1211 | err = lowpan_skb_fragmentation(skb, dev); |
719269af | 1212 | error: |
1213 | dev_kfree_skb(skb); | |
1214 | out: | |
fc52eea4 | 1215 | if (err) |
e71094f9 | 1216 | pr_debug("ERROR: xmit failed\n"); |
44331fe2 | 1217 | |
fc52eea4 | 1218 | return (err < 0) ? NET_XMIT_DROP : err; |
44331fe2 AS |
1219 | } |
1220 | ||
0848e404 | 1221 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1222 | { | |
1223 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1224 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1225 | } | |
1226 | ||
1227 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1228 | { | |
1229 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1230 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1231 | } | |
1232 | ||
1233 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1234 | { | |
1235 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1236 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1237 | } | |
1238 | ||
c7d0ab28 TC |
1239 | static u8 lowpan_get_dsn(const struct net_device *dev) |
1240 | { | |
1241 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1242 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); | |
1243 | } | |
1244 | ||
44331fe2 AS |
1245 | static struct header_ops lowpan_header_ops = { |
1246 | .create = lowpan_header_create, | |
1247 | }; | |
1248 | ||
1249 | static const struct net_device_ops lowpan_netdev_ops = { | |
1250 | .ndo_start_xmit = lowpan_xmit, | |
42c36295 | 1251 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
1252 | }; |
1253 | ||
0848e404 | 1254 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1255 | .get_pan_id = lowpan_get_pan_id, | |
1256 | .get_phy = lowpan_get_phy, | |
1257 | .get_short_addr = lowpan_get_short_addr, | |
c7d0ab28 | 1258 | .get_dsn = lowpan_get_dsn, |
0848e404 | 1259 | }; |
1260 | ||
44331fe2 AS |
1261 | static void lowpan_setup(struct net_device *dev) |
1262 | { | |
44331fe2 AS |
1263 | dev->addr_len = IEEE802154_ADDR_LEN; |
1264 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1265 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1266 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1267 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1268 | dev->needed_tailroom = 2; /* FCS */ | |
1269 | dev->mtu = 1281; | |
1270 | dev->tx_queue_len = 0; | |
4d039f68 | 1271 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1272 | dev->watchdog_timeo = 0; |
1273 | ||
1274 | dev->netdev_ops = &lowpan_netdev_ops; | |
1275 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1276 | dev->ml_priv = &lowpan_mlme; |
a2dc375e | 1277 | dev->destructor = free_netdev; |
44331fe2 AS |
1278 | } |
1279 | ||
1280 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1281 | { | |
44331fe2 AS |
1282 | if (tb[IFLA_ADDRESS]) { |
1283 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
1284 | return -EINVAL; | |
1285 | } | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1290 | struct packet_type *pt, struct net_device *orig_dev) | |
1291 | { | |
a437d274 AO |
1292 | struct sk_buff *local_skb; |
1293 | ||
44331fe2 AS |
1294 | if (!netif_running(dev)) |
1295 | goto drop; | |
1296 | ||
1297 | if (dev->type != ARPHRD_IEEE802154) | |
1298 | goto drop; | |
1299 | ||
1300 | /* check that it's our buffer */ | |
ee21c7e0 AO |
1301 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
1302 | /* Copy the packet so that the IPv6 header is | |
1303 | * properly aligned. | |
1304 | */ | |
1305 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
1306 | skb_tailroom(skb), GFP_ATOMIC); | |
a437d274 AO |
1307 | if (!local_skb) |
1308 | goto drop; | |
a437d274 | 1309 | |
ee21c7e0 AO |
1310 | local_skb->protocol = htons(ETH_P_IPV6); |
1311 | local_skb->pkt_type = PACKET_HOST; | |
1312 | ||
1313 | /* Pull off the 1-byte of 6lowpan header. */ | |
1314 | skb_pull(local_skb, 1); | |
ee21c7e0 AO |
1315 | |
1316 | lowpan_give_skb_to_devices(local_skb); | |
1317 | ||
1318 | kfree_skb(local_skb); | |
a437d274 | 1319 | kfree_skb(skb); |
ee21c7e0 AO |
1320 | } else { |
1321 | switch (skb->data[0] & 0xe0) { | |
1322 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1323 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1324 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
1325 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
1326 | if (!local_skb) | |
1327 | goto drop; | |
1328 | lowpan_process_data(local_skb); | |
1329 | ||
1330 | kfree_skb(skb); | |
1331 | break; | |
1332 | default: | |
1333 | break; | |
1334 | } | |
719269af | 1335 | } |
44331fe2 AS |
1336 | |
1337 | return NET_RX_SUCCESS; | |
1338 | ||
1339 | drop: | |
1340 | kfree_skb(skb); | |
1341 | return NET_RX_DROP; | |
1342 | } | |
1343 | ||
1344 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1345 | struct nlattr *tb[], struct nlattr *data[]) | |
1346 | { | |
1347 | struct net_device *real_dev; | |
1348 | struct lowpan_dev_record *entry; | |
1349 | ||
e71094f9 | 1350 | pr_debug("adding new link\n"); |
44331fe2 AS |
1351 | |
1352 | if (!tb[IFLA_LINK]) | |
1353 | return -EINVAL; | |
1354 | /* find and hold real wpan device */ | |
1355 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1356 | if (!real_dev) | |
1357 | return -ENODEV; | |
7adac1ec AO |
1358 | if (real_dev->type != ARPHRD_IEEE802154) |
1359 | return -EINVAL; | |
44331fe2 AS |
1360 | |
1361 | lowpan_dev_info(dev)->real_dev = real_dev; | |
d4ac3236 | 1362 | lowpan_dev_info(dev)->fragment_tag = 0; |
44331fe2 AS |
1363 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); |
1364 | ||
1365 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1366 | if (!entry) { |
1367 | dev_put(real_dev); | |
1368 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1369 | return -ENOMEM; |
dc00fd44 | 1370 | } |
44331fe2 AS |
1371 | |
1372 | entry->ldev = dev; | |
1373 | ||
ab2d95df AO |
1374 | /* Set the lowpan harware address to the wpan hardware address. */ |
1375 | memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); | |
1376 | ||
44331fe2 AS |
1377 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
1378 | INIT_LIST_HEAD(&entry->list); | |
1379 | list_add_tail(&entry->list, &lowpan_devices); | |
1380 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1381 | ||
1382 | register_netdevice(dev); | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1388 | { | |
1389 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1390 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1391 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
1392 | |
1393 | ASSERT_RTNL(); | |
1394 | ||
1395 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 1396 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1397 | if (entry->ldev == dev) { |
1398 | list_del(&entry->list); | |
1399 | kfree(entry); | |
1400 | } | |
aec9db35 | 1401 | } |
44331fe2 AS |
1402 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1403 | ||
1404 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1405 | ||
1406 | unregister_netdevice_queue(dev, head); | |
1407 | ||
1408 | dev_put(real_dev); | |
1409 | } | |
1410 | ||
1411 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1412 | .kind = "lowpan", | |
1413 | .priv_size = sizeof(struct lowpan_dev_info), | |
1414 | .setup = lowpan_setup, | |
1415 | .newlink = lowpan_newlink, | |
1416 | .dellink = lowpan_dellink, | |
1417 | .validate = lowpan_validate, | |
1418 | }; | |
1419 | ||
1420 | static inline int __init lowpan_netlink_init(void) | |
1421 | { | |
1422 | return rtnl_link_register(&lowpan_link_ops); | |
1423 | } | |
1424 | ||
a07fdcec | 1425 | static inline void lowpan_netlink_fini(void) |
44331fe2 AS |
1426 | { |
1427 | rtnl_link_unregister(&lowpan_link_ops); | |
1428 | } | |
1429 | ||
a2dc375e | 1430 | static int lowpan_device_event(struct notifier_block *unused, |
351638e7 | 1431 | unsigned long event, void *ptr) |
a2dc375e | 1432 | { |
351638e7 | 1433 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
a2dc375e AO |
1434 | LIST_HEAD(del_list); |
1435 | struct lowpan_dev_record *entry, *tmp; | |
1436 | ||
1437 | if (dev->type != ARPHRD_IEEE802154) | |
1438 | goto out; | |
1439 | ||
1440 | if (event == NETDEV_UNREGISTER) { | |
1441 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
1442 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
1443 | lowpan_dellink(entry->ldev, &del_list); | |
1444 | } | |
1445 | ||
1446 | unregister_netdevice_many(&del_list); | |
4c835019 | 1447 | } |
a2dc375e AO |
1448 | |
1449 | out: | |
1450 | return NOTIFY_DONE; | |
1451 | } | |
1452 | ||
1453 | static struct notifier_block lowpan_dev_notifier = { | |
1454 | .notifier_call = lowpan_device_event, | |
1455 | }; | |
1456 | ||
44331fe2 AS |
1457 | static struct packet_type lowpan_packet_type = { |
1458 | .type = __constant_htons(ETH_P_IEEE802154), | |
1459 | .func = lowpan_rcv, | |
1460 | }; | |
1461 | ||
1462 | static int __init lowpan_init_module(void) | |
1463 | { | |
1464 | int err = 0; | |
1465 | ||
44331fe2 AS |
1466 | err = lowpan_netlink_init(); |
1467 | if (err < 0) | |
1468 | goto out; | |
1469 | ||
1470 | dev_add_pack(&lowpan_packet_type); | |
a2dc375e AO |
1471 | |
1472 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
1473 | if (err < 0) { | |
1474 | dev_remove_pack(&lowpan_packet_type); | |
1475 | lowpan_netlink_fini(); | |
1476 | } | |
44331fe2 AS |
1477 | out: |
1478 | return err; | |
1479 | } | |
1480 | ||
1481 | static void __exit lowpan_cleanup_module(void) | |
1482 | { | |
33c34c5e | 1483 | struct lowpan_fragment *frame, *tframe; |
1484 | ||
44331fe2 AS |
1485 | lowpan_netlink_fini(); |
1486 | ||
1487 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 1488 | |
a2dc375e AO |
1489 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
1490 | ||
33c34c5e | 1491 | /* Now 6lowpan packet_type is removed, so no new fragments are |
1492 | * expected on RX, therefore that's the time to clean incomplete | |
1493 | * fragments. | |
1494 | */ | |
1495 | spin_lock_bh(&flist_lock); | |
1496 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1497 | del_timer_sync(&frame->timer); | |
1498 | list_del(&frame->list); | |
1499 | dev_kfree_skb(frame->skb); | |
1500 | kfree(frame); | |
1501 | } | |
1502 | spin_unlock_bh(&flist_lock); | |
44331fe2 AS |
1503 | } |
1504 | ||
1505 | module_init(lowpan_init_module); | |
1506 | module_exit(lowpan_cleanup_module); | |
1507 | MODULE_LICENSE("GPL"); | |
1508 | MODULE_ALIAS_RTNL_LINK("lowpan"); |