Commit | Line | Data |
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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 | ||
70 | /* | |
71 | * Uncompression of linklocal: | |
72 | * 0 -> 16 bytes from packet | |
73 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet | |
74 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet | |
75 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr | |
76 | * | |
77 | * NOTE: => the uncompress function does change 0xf to 0x10 | |
78 | * NOTE: 0x00 => no-autoconfig => unspecified | |
79 | */ | |
80 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; | |
81 | ||
82 | /* | |
83 | * Uncompression of ctx-based: | |
84 | * 0 -> 0 bits from packet [unspecified / reserved] | |
85 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet | |
86 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet | |
87 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr | |
88 | */ | |
89 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; | |
90 | ||
44331fe2 AS |
91 | /* Link local prefix */ |
92 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; | |
93 | ||
94 | /* private device info */ | |
95 | struct lowpan_dev_info { | |
96 | struct net_device *real_dev; /* real WPAN device ptr */ | |
97 | struct mutex dev_list_mtx; /* mutex for list ops */ | |
ababf385 | 98 | unsigned short fragment_tag; |
44331fe2 AS |
99 | }; |
100 | ||
101 | struct lowpan_dev_record { | |
102 | struct net_device *ldev; | |
103 | struct list_head list; | |
104 | }; | |
105 | ||
719269af | 106 | struct lowpan_fragment { |
107 | struct sk_buff *skb; /* skb to be assembled */ | |
719269af | 108 | u16 length; /* length to be assemled */ |
109 | u32 bytes_rcv; /* bytes received */ | |
110 | u16 tag; /* current fragment tag */ | |
111 | struct timer_list timer; /* assembling timer */ | |
112 | struct list_head list; /* fragments list */ | |
113 | }; | |
114 | ||
719269af | 115 | static LIST_HEAD(lowpan_fragments); |
4d27de14 | 116 | static DEFINE_SPINLOCK(flist_lock); |
719269af | 117 | |
44331fe2 AS |
118 | static inline struct |
119 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) | |
120 | { | |
121 | return netdev_priv(dev); | |
122 | } | |
123 | ||
124 | static inline void lowpan_address_flip(u8 *src, u8 *dest) | |
125 | { | |
126 | int i; | |
127 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) | |
128 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; | |
129 | } | |
130 | ||
131 | /* list of all 6lowpan devices, uses for package delivering */ | |
132 | /* print data in line */ | |
133 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, | |
134 | unsigned char *buf, int len) | |
135 | { | |
136 | #ifdef DEBUG | |
137 | if (msg) | |
138 | pr_debug("(%s) %s: ", caller, msg); | |
139 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, | |
140 | 16, 1, buf, len, false); | |
141 | #endif /* DEBUG */ | |
142 | } | |
143 | ||
144 | /* | |
145 | * print data in a table format: | |
146 | * | |
147 | * addr: xx xx xx xx xx xx | |
148 | * addr: xx xx xx xx xx xx | |
149 | * ... | |
150 | */ | |
151 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, | |
152 | unsigned char *buf, int len) | |
153 | { | |
154 | #ifdef DEBUG | |
155 | if (msg) | |
156 | pr_debug("(%s) %s:\n", caller, msg); | |
157 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, | |
158 | 16, 1, buf, len, false); | |
159 | #endif /* DEBUG */ | |
160 | } | |
161 | ||
162 | static u8 | |
163 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, | |
164 | const unsigned char *lladdr) | |
165 | { | |
166 | u8 val = 0; | |
167 | ||
168 | if (is_addr_mac_addr_based(ipaddr, lladdr)) | |
169 | val = 3; /* 0-bits */ | |
170 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
171 | /* compress IID to 16 bits xxxx::XXXX */ | |
172 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
173 | *hc06_ptr += 2; | |
174 | val = 2; /* 16-bits */ | |
175 | } else { | |
176 | /* do not compress IID => xxxx::IID */ | |
177 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
178 | *hc06_ptr += 8; | |
179 | val = 1; /* 64-bits */ | |
180 | } | |
181 | ||
182 | return rol8(val, shift); | |
183 | } | |
184 | ||
185 | static void | |
186 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) | |
187 | { | |
2d319508 | 188 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
189 | /* second bit-flip (Universe/Local) is done according RFC2464 */ |
190 | ipaddr->s6_addr[8] ^= 0x02; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Uncompress addresses based on a prefix and a postfix with zeroes in | |
195 | * between. If the postfix is zero in length it will use the link address | |
196 | * to configure the IP address (autoconf style). | |
197 | * pref_post_count takes a byte where the first nibble specify prefix count | |
198 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). | |
199 | */ | |
200 | static int | |
201 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, | |
202 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) | |
203 | { | |
204 | u8 prefcount = pref_post_count >> 4; | |
205 | u8 postcount = pref_post_count & 0x0f; | |
206 | ||
207 | /* full nibble 15 => 16 */ | |
208 | prefcount = (prefcount == 15 ? 16 : prefcount); | |
209 | postcount = (postcount == 15 ? 16 : postcount); | |
210 | ||
211 | if (lladdr) | |
212 | lowpan_raw_dump_inline(__func__, "linklocal address", | |
2d319508 | 213 | lladdr, IEEE802154_ADDR_LEN); |
44331fe2 AS |
214 | if (prefcount > 0) |
215 | memcpy(ipaddr, prefix, prefcount); | |
216 | ||
44331fe2 AS |
217 | if (postcount > 0) { |
218 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); | |
219 | skb_pull(skb, postcount); | |
220 | } else if (prefcount > 0) { | |
221 | if (lladdr == NULL) | |
222 | return -EINVAL; | |
223 | ||
224 | /* no IID based configuration if no prefix and no data */ | |
225 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); | |
226 | } | |
227 | ||
e71094f9 | 228 | pr_debug("uncompressing %d + %d => ", prefcount, postcount); |
44331fe2 AS |
229 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
84c2e7bc AA |
234 | /* Uncompress function for multicast destination address, |
235 | * when M bit is set. | |
236 | */ | |
237 | static int | |
238 | lowpan_uncompress_multicast_daddr(struct sk_buff *skb, | |
239 | struct in6_addr *ipaddr, | |
240 | const u8 dam) | |
241 | { | |
242 | bool fail; | |
243 | ||
244 | switch (dam) { | |
245 | case LOWPAN_IPHC_DAM_00: | |
246 | /* 00: 128 bits. The full address | |
247 | * is carried in-line. | |
248 | */ | |
249 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
250 | break; | |
251 | case LOWPAN_IPHC_DAM_01: | |
252 | /* 01: 48 bits. The address takes | |
253 | * the form ffXX::00XX:XXXX:XXXX. | |
254 | */ | |
255 | ipaddr->s6_addr[0] = 0xFF; | |
256 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
257 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
258 | break; | |
259 | case LOWPAN_IPHC_DAM_10: | |
260 | /* 10: 32 bits. The address takes | |
261 | * the form ffXX::00XX:XXXX. | |
262 | */ | |
263 | ipaddr->s6_addr[0] = 0xFF; | |
264 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
265 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
266 | break; | |
267 | case LOWPAN_IPHC_DAM_11: | |
268 | /* 11: 8 bits. The address takes | |
269 | * the form ff02::00XX. | |
270 | */ | |
271 | ipaddr->s6_addr[0] = 0xFF; | |
272 | ipaddr->s6_addr[1] = 0x02; | |
273 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
274 | break; | |
275 | default: | |
276 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
277 | return -EINVAL; | |
278 | } | |
279 | ||
280 | if (fail) { | |
281 | pr_debug("Failed to fetch skb data\n"); | |
282 | return -EIO; | |
283 | } | |
284 | ||
285 | lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is:\n", | |
286 | ipaddr->s6_addr, 16); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
3bd5b958 | 291 | static void |
292 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
293 | { | |
294 | struct udphdr *uh = udp_hdr(skb); | |
295 | ||
3bd5b958 | 296 | if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == |
297 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
298 | ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == | |
299 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
e71094f9 | 300 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
3bd5b958 | 301 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; |
302 | **(hc06_ptr + 1) = /* subtraction is faster */ | |
303 | (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + | |
304 | ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); | |
305 | *hc06_ptr += 2; | |
306 | } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == | |
307 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 308 | pr_debug("UDP header: remove 8 bits of dest\n"); |
3bd5b958 | 309 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; |
310 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
311 | **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); | |
312 | *hc06_ptr += 4; | |
313 | } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == | |
314 | LOWPAN_NHC_UDP_8BIT_PORT) { | |
e71094f9 | 315 | pr_debug("UDP header: remove 8 bits of source\n"); |
3bd5b958 | 316 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; |
317 | memcpy(*hc06_ptr + 1, &uh->dest, 2); | |
318 | **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); | |
319 | *hc06_ptr += 4; | |
320 | } else { | |
e71094f9 | 321 | pr_debug("UDP header: can't compress\n"); |
3bd5b958 | 322 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; |
323 | memcpy(*hc06_ptr + 1, &uh->source, 2); | |
324 | memcpy(*hc06_ptr + 3, &uh->dest, 2); | |
325 | *hc06_ptr += 5; | |
326 | } | |
327 | ||
328 | /* checksum is always inline */ | |
329 | memcpy(*hc06_ptr, &uh->check, 2); | |
330 | *hc06_ptr += 2; | |
24363b67 TC |
331 | |
332 | /* skip the UDP header */ | |
333 | skb_pull(skb, sizeof(struct udphdr)); | |
3bd5b958 | 334 | } |
335 | ||
c5d3687f | 336 | static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) |
44331fe2 | 337 | { |
c5d3687f | 338 | if (unlikely(!pskb_may_pull(skb, 1))) |
339 | return -EINVAL; | |
44331fe2 | 340 | |
c5d3687f | 341 | *val = skb->data[0]; |
44331fe2 AS |
342 | skb_pull(skb, 1); |
343 | ||
c5d3687f | 344 | return 0; |
44331fe2 AS |
345 | } |
346 | ||
c5d3687f | 347 | static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val) |
719269af | 348 | { |
c5d3687f | 349 | if (unlikely(!pskb_may_pull(skb, 2))) |
350 | return -EINVAL; | |
719269af | 351 | |
4576039f | 352 | *val = (skb->data[0] << 8) | skb->data[1]; |
719269af | 353 | skb_pull(skb, 2); |
c5d3687f | 354 | |
355 | return 0; | |
719269af | 356 | } |
357 | ||
f8b1b5d2 | 358 | static int |
24363b67 | 359 | lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) |
f8b1b5d2 | 360 | { |
f8b1b5d2 | 361 | u8 tmp; |
362 | ||
d4787a15 TC |
363 | if (!uh) |
364 | goto err; | |
365 | ||
c5d3687f | 366 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
367 | goto err; | |
f8b1b5d2 | 368 | |
369 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
e71094f9 | 370 | pr_debug("UDP header uncompression\n"); |
f8b1b5d2 | 371 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { |
372 | case LOWPAN_NHC_UDP_CS_P_00: | |
373 | memcpy(&uh->source, &skb->data[0], 2); | |
374 | memcpy(&uh->dest, &skb->data[2], 2); | |
375 | skb_pull(skb, 4); | |
376 | break; | |
377 | case LOWPAN_NHC_UDP_CS_P_01: | |
378 | memcpy(&uh->source, &skb->data[0], 2); | |
379 | uh->dest = | |
380 | skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT; | |
381 | skb_pull(skb, 3); | |
382 | break; | |
383 | case LOWPAN_NHC_UDP_CS_P_10: | |
384 | uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT; | |
385 | memcpy(&uh->dest, &skb->data[1], 2); | |
386 | skb_pull(skb, 3); | |
387 | break; | |
388 | case LOWPAN_NHC_UDP_CS_P_11: | |
389 | uh->source = | |
390 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4); | |
391 | uh->dest = | |
392 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f); | |
393 | skb_pull(skb, 1); | |
394 | break; | |
395 | default: | |
e71094f9 | 396 | pr_debug("ERROR: unknown UDP format\n"); |
f8b1b5d2 | 397 | goto err; |
398 | break; | |
399 | } | |
400 | ||
e71094f9 | 401 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", |
402 | uh->source, uh->dest); | |
f8b1b5d2 | 403 | |
404 | /* copy checksum */ | |
405 | memcpy(&uh->check, &skb->data[0], 2); | |
406 | skb_pull(skb, 2); | |
24363b67 TC |
407 | |
408 | /* | |
409 | * UDP lenght needs to be infered from the lower layers | |
410 | * here, we obtain the hint from the remaining size of the | |
411 | * frame | |
412 | */ | |
413 | uh->len = htons(skb->len + sizeof(struct udphdr)); | |
414 | pr_debug("uncompressed UDP length: src = %d", uh->len); | |
f8b1b5d2 | 415 | } else { |
e71094f9 | 416 | pr_debug("ERROR: unsupported NH format\n"); |
f8b1b5d2 | 417 | goto err; |
418 | } | |
419 | ||
420 | return 0; | |
421 | err: | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
44331fe2 AS |
425 | static int lowpan_header_create(struct sk_buff *skb, |
426 | struct net_device *dev, | |
427 | unsigned short type, const void *_daddr, | |
95c96174 | 428 | const void *_saddr, unsigned int len) |
44331fe2 AS |
429 | { |
430 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
431 | struct ipv6hdr *hdr; | |
432 | const u8 *saddr = _saddr; | |
433 | const u8 *daddr = _daddr; | |
fc4e98db | 434 | u8 head[100]; |
44331fe2 AS |
435 | struct ieee802154_addr sa, da; |
436 | ||
fc4e98db AA |
437 | /* TODO: |
438 | * if this package isn't ipv6 one, where should it be routed? | |
439 | */ | |
44331fe2 AS |
440 | if (type != ETH_P_IPV6) |
441 | return 0; | |
44331fe2 AS |
442 | |
443 | hdr = ipv6_hdr(skb); | |
444 | hc06_ptr = head + 2; | |
445 | ||
e71094f9 | 446 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
447 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version, | |
448 | ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit); | |
44331fe2 AS |
449 | |
450 | lowpan_raw_dump_table(__func__, "raw skb network header dump", | |
451 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
452 | ||
453 | if (!saddr) | |
454 | saddr = dev->dev_addr; | |
455 | ||
456 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
457 | ||
458 | /* | |
459 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
460 | * we sometimes use |= | |
461 | * If the field is 0, and the current bit value in memory is 1, | |
462 | * this does not work. We therefore reset the IPHC encoding here | |
463 | */ | |
464 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
465 | iphc1 = 0; | |
466 | ||
467 | /* TODO: context lookup */ | |
468 | ||
469 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
470 | ||
471 | /* | |
472 | * Traffic class, flow label | |
473 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
474 | * We have to process both in the same time as the offset of traffic | |
475 | * class depends on the presence of version and flow label | |
476 | */ | |
477 | ||
478 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
479 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
480 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
481 | ||
482 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
483 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
484 | /* flow label can be compressed */ | |
485 | iphc0 |= LOWPAN_IPHC_FL_C; | |
486 | if ((hdr->priority == 0) && | |
487 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
488 | /* compress (elide) all */ | |
489 | iphc0 |= LOWPAN_IPHC_TC_C; | |
490 | } else { | |
491 | /* compress only the flow label */ | |
492 | *hc06_ptr = tmp; | |
493 | hc06_ptr += 1; | |
494 | } | |
495 | } else { | |
496 | /* Flow label cannot be compressed */ | |
497 | if ((hdr->priority == 0) && | |
498 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
499 | /* compress only traffic class */ | |
500 | iphc0 |= LOWPAN_IPHC_TC_C; | |
501 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
502 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
503 | hc06_ptr += 3; | |
504 | } else { | |
505 | /* compress nothing */ | |
506 | memcpy(hc06_ptr, &hdr, 4); | |
507 | /* replace the top byte with new ECN | DSCP format */ | |
508 | *hc06_ptr = tmp; | |
509 | hc06_ptr += 4; | |
510 | } | |
511 | } | |
512 | ||
513 | /* NOTE: payload length is always compressed */ | |
514 | ||
515 | /* Next Header is compress if UDP */ | |
516 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
517 | iphc0 |= LOWPAN_IPHC_NH_C; | |
518 | ||
44331fe2 AS |
519 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
520 | *hc06_ptr = hdr->nexthdr; | |
521 | hc06_ptr += 1; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Hop limit | |
526 | * if 1: compress, encoding is 01 | |
527 | * if 64: compress, encoding is 10 | |
528 | * if 255: compress, encoding is 11 | |
529 | * else do not compress | |
530 | */ | |
531 | switch (hdr->hop_limit) { | |
532 | case 1: | |
533 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
534 | break; | |
535 | case 64: | |
536 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
537 | break; | |
538 | case 255: | |
539 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
540 | break; | |
541 | default: | |
542 | *hc06_ptr = hdr->hop_limit; | |
5c00c0cb | 543 | hc06_ptr += 1; |
44331fe2 AS |
544 | break; |
545 | } | |
546 | ||
547 | /* source address compression */ | |
548 | if (is_addr_unspecified(&hdr->saddr)) { | |
e71094f9 | 549 | pr_debug("source address is unspecified, setting SAC\n"); |
44331fe2 AS |
550 | iphc1 |= LOWPAN_IPHC_SAC; |
551 | /* TODO: context lookup */ | |
552 | } else if (is_addr_link_local(&hdr->saddr)) { | |
e71094f9 | 553 | pr_debug("source address is link-local\n"); |
44331fe2 AS |
554 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
555 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); | |
556 | } else { | |
e71094f9 | 557 | pr_debug("send the full source address\n"); |
44331fe2 AS |
558 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
559 | hc06_ptr += 16; | |
560 | } | |
561 | ||
562 | /* destination address compression */ | |
563 | if (is_addr_mcast(&hdr->daddr)) { | |
e71094f9 | 564 | pr_debug("destination address is multicast: "); |
44331fe2 AS |
565 | iphc1 |= LOWPAN_IPHC_M; |
566 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
567 | pr_debug("compressed to 1 octet\n"); | |
568 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
569 | /* use last byte */ | |
570 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
571 | hc06_ptr += 1; | |
572 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
573 | pr_debug("compressed to 4 octets\n"); | |
574 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
575 | /* second byte + the last three */ | |
576 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
577 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
578 | hc06_ptr += 4; | |
579 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
580 | pr_debug("compressed to 6 octets\n"); | |
581 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
582 | /* second byte + the last five */ | |
583 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
584 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
585 | hc06_ptr += 6; | |
586 | } else { | |
587 | pr_debug("using full address\n"); | |
588 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
589 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
590 | hc06_ptr += 16; | |
591 | } | |
592 | } else { | |
44331fe2 AS |
593 | /* TODO: context lookup */ |
594 | if (is_addr_link_local(&hdr->daddr)) { | |
e71094f9 | 595 | pr_debug("dest address is unicast and link-local\n"); |
44331fe2 AS |
596 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
597 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); | |
598 | } else { | |
e71094f9 | 599 | pr_debug("dest address is unicast: using full one\n"); |
44331fe2 AS |
600 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
601 | hc06_ptr += 16; | |
602 | } | |
603 | } | |
604 | ||
3bd5b958 | 605 | /* UDP header compression */ |
606 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
607 | lowpan_compress_udp_header(&hc06_ptr, skb); | |
44331fe2 AS |
608 | |
609 | head[0] = iphc0; | |
610 | head[1] = iphc1; | |
611 | ||
612 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
613 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
614 | ||
44331fe2 AS |
615 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, |
616 | skb->len); | |
617 | ||
618 | /* | |
619 | * NOTE1: I'm still unsure about the fact that compression and WPAN | |
620 | * header are created here and not later in the xmit. So wait for | |
621 | * an opinion of net maintainers. | |
622 | */ | |
623 | /* | |
624 | * NOTE2: to be absolutely correct, we must derive PANid information | |
625 | * from MAC subif of the 'dev' and 'real_dev' network devices, but | |
626 | * this isn't implemented in mainline yet, so currently we assign 0xff | |
627 | */ | |
628 | { | |
58ef67c3 | 629 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
c7d0ab28 | 630 | mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); |
58ef67c3 | 631 | |
44331fe2 AS |
632 | /* prepare wpan address data */ |
633 | sa.addr_type = IEEE802154_ADDR_LONG; | |
43de7aa6 TC |
634 | sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); |
635 | ||
44331fe2 | 636 | memcpy(&(sa.hwaddr), saddr, 8); |
43de7aa6 TC |
637 | /* intra-PAN communications */ |
638 | da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); | |
44331fe2 | 639 | |
58ef67c3 TC |
640 | /* |
641 | * if the destination address is the broadcast address, use the | |
642 | * corresponding short address | |
643 | */ | |
644 | if (lowpan_is_addr_broadcast(daddr)) { | |
645 | da.addr_type = IEEE802154_ADDR_SHORT; | |
646 | da.short_addr = IEEE802154_ADDR_BROADCAST; | |
647 | } else { | |
648 | da.addr_type = IEEE802154_ADDR_LONG; | |
6bdeaba4 | 649 | memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN); |
719269af | 650 | |
58ef67c3 | 651 | /* request acknowledgment */ |
f333a15a | 652 | mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; |
58ef67c3 | 653 | } |
f333a15a | 654 | |
44331fe2 AS |
655 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
656 | type, (void *)&da, (void *)&sa, skb->len); | |
657 | } | |
658 | } | |
659 | ||
0c446212 AO |
660 | static int lowpan_give_skb_to_devices(struct sk_buff *skb) |
661 | { | |
662 | struct lowpan_dev_record *entry; | |
663 | struct sk_buff *skb_cp; | |
664 | int stat = NET_RX_SUCCESS; | |
665 | ||
666 | rcu_read_lock(); | |
667 | list_for_each_entry_rcu(entry, &lowpan_devices, list) | |
668 | if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) { | |
669 | skb_cp = skb_copy(skb, GFP_ATOMIC); | |
670 | if (!skb_cp) { | |
671 | stat = -ENOMEM; | |
672 | break; | |
673 | } | |
674 | ||
675 | skb_cp->dev = entry->ldev; | |
676 | stat = netif_rx(skb_cp); | |
677 | } | |
678 | rcu_read_unlock(); | |
679 | ||
680 | return stat; | |
681 | } | |
682 | ||
44331fe2 AS |
683 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) |
684 | { | |
685 | struct sk_buff *new; | |
44331fe2 AS |
686 | int stat = NET_RX_SUCCESS; |
687 | ||
688 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
dcef1151 | 689 | GFP_ATOMIC); |
44331fe2 AS |
690 | kfree_skb(skb); |
691 | ||
dcef1151 | 692 | if (!new) |
44331fe2 AS |
693 | return -ENOMEM; |
694 | ||
695 | skb_push(new, sizeof(struct ipv6hdr)); | |
696 | skb_reset_network_header(new); | |
697 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
698 | ||
699 | new->protocol = htons(ETH_P_IPV6); | |
700 | new->pkt_type = PACKET_HOST; | |
701 | ||
0c446212 | 702 | stat = lowpan_give_skb_to_devices(new); |
44331fe2 AS |
703 | |
704 | kfree_skb(new); | |
705 | ||
706 | return stat; | |
707 | } | |
708 | ||
719269af | 709 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
710 | { | |
711 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; | |
712 | ||
e71094f9 | 713 | pr_debug("timer expired for frame with tag %d\n", entry->tag); |
719269af | 714 | |
719269af | 715 | list_del(&entry->list); |
719269af | 716 | dev_kfree_skb(entry->skb); |
717 | kfree(entry); | |
718 | } | |
719 | ||
c2e94d73 | 720 | static struct lowpan_fragment * |
d991b98f | 721 | lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag) |
c2e94d73 | 722 | { |
723 | struct lowpan_fragment *frame; | |
724 | ||
725 | frame = kzalloc(sizeof(struct lowpan_fragment), | |
726 | GFP_ATOMIC); | |
727 | if (!frame) | |
728 | goto frame_err; | |
729 | ||
730 | INIT_LIST_HEAD(&frame->list); | |
731 | ||
5e96855f | 732 | frame->length = len; |
c2e94d73 | 733 | frame->tag = tag; |
734 | ||
735 | /* allocate buffer for frame assembling */ | |
79ff1db6 | 736 | frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length + |
737 | sizeof(struct ipv6hdr)); | |
c2e94d73 | 738 | |
739 | if (!frame->skb) | |
740 | goto skb_err; | |
741 | ||
742 | frame->skb->priority = skb->priority; | |
743 | frame->skb->dev = skb->dev; | |
744 | ||
745 | /* reserve headroom for uncompressed ipv6 header */ | |
746 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); | |
747 | skb_put(frame->skb, frame->length); | |
748 | ||
31afe1f7 DH |
749 | /* copy the first control block to keep a |
750 | * trace of the link-layer addresses in case | |
751 | * of a link-local compressed address | |
752 | */ | |
753 | memcpy(frame->skb->cb, skb->cb, sizeof(skb->cb)); | |
754 | ||
c2e94d73 | 755 | init_timer(&frame->timer); |
756 | /* time out is the same as for ipv6 - 60 sec */ | |
757 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; | |
758 | frame->timer.data = (unsigned long)frame; | |
759 | frame->timer.function = lowpan_fragment_timer_expired; | |
760 | ||
761 | add_timer(&frame->timer); | |
762 | ||
763 | list_add_tail(&frame->list, &lowpan_fragments); | |
764 | ||
765 | return frame; | |
766 | ||
767 | skb_err: | |
768 | kfree(frame); | |
769 | frame_err: | |
770 | return NULL; | |
771 | } | |
772 | ||
44331fe2 AS |
773 | static int |
774 | lowpan_process_data(struct sk_buff *skb) | |
775 | { | |
84ce1ddf | 776 | struct ipv6hdr hdr = {}; |
44331fe2 AS |
777 | u8 tmp, iphc0, iphc1, num_context = 0; |
778 | u8 *_saddr, *_daddr; | |
779 | int err; | |
780 | ||
781 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, | |
782 | skb->len); | |
783 | /* at least two bytes will be used for the encoding */ | |
784 | if (skb->len < 2) | |
785 | goto drop; | |
c5d3687f | 786 | |
787 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
788 | goto drop; | |
719269af | 789 | |
790 | /* fragments assembling */ | |
791 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { | |
792 | case LOWPAN_DISPATCH_FRAG1: | |
793 | case LOWPAN_DISPATCH_FRAGN: | |
794 | { | |
795 | struct lowpan_fragment *frame; | |
5e96855f | 796 | /* slen stores the rightmost 8 bits of the 11 bits length */ |
d991b98f | 797 | u8 slen, offset = 0; |
5e96855f | 798 | u16 len, tag; |
719269af | 799 | bool found = false; |
800 | ||
5e96855f | 801 | if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */ |
c5d3687f | 802 | lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */ |
803 | goto drop; | |
719269af | 804 | |
5e96855f TC |
805 | /* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */ |
806 | len = ((iphc0 & 7) << 8) | slen; | |
807 | ||
9da2924c TC |
808 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) { |
809 | pr_debug("%s received a FRAG1 packet (tag: %d, " | |
810 | "size of the entire IP packet: %d)", | |
811 | __func__, tag, len); | |
812 | } else { /* FRAGN */ | |
d991b98f TC |
813 | if (lowpan_fetch_skb_u8(skb, &offset)) |
814 | goto unlock_and_drop; | |
9da2924c TC |
815 | pr_debug("%s received a FRAGN packet (tag: %d, " |
816 | "size of the entire IP packet: %d, " | |
817 | "offset: %d)", __func__, tag, len, offset * 8); | |
d991b98f TC |
818 | } |
819 | ||
719269af | 820 | /* |
821 | * check if frame assembling with the same tag is | |
822 | * already in progress | |
823 | */ | |
33c34c5e | 824 | spin_lock_bh(&flist_lock); |
719269af | 825 | |
826 | list_for_each_entry(frame, &lowpan_fragments, list) | |
827 | if (frame->tag == tag) { | |
828 | found = true; | |
829 | break; | |
830 | } | |
831 | ||
832 | /* alloc new frame structure */ | |
833 | if (!found) { | |
9da2924c TC |
834 | pr_debug("%s first fragment received for tag %d, " |
835 | "begin packet reassembly", __func__, tag); | |
5e96855f | 836 | frame = lowpan_alloc_new_frame(skb, len, tag); |
719269af | 837 | if (!frame) |
838 | goto unlock_and_drop; | |
719269af | 839 | } |
840 | ||
719269af | 841 | /* if payload fits buffer, copy it */ |
842 | if (likely((offset * 8 + skb->len) <= frame->length)) | |
843 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, | |
844 | skb->data, skb->len); | |
845 | else | |
846 | goto unlock_and_drop; | |
847 | ||
848 | frame->bytes_rcv += skb->len; | |
849 | ||
850 | /* frame assembling complete */ | |
851 | if ((frame->bytes_rcv == frame->length) && | |
852 | frame->timer.expires > jiffies) { | |
853 | /* if timer haven't expired - first of all delete it */ | |
33c34c5e | 854 | del_timer_sync(&frame->timer); |
719269af | 855 | list_del(&frame->list); |
33c34c5e | 856 | spin_unlock_bh(&flist_lock); |
719269af | 857 | |
9da2924c TC |
858 | pr_debug("%s successfully reassembled fragment " |
859 | "(tag %d)", __func__, tag); | |
860 | ||
719269af | 861 | dev_kfree_skb(skb); |
862 | skb = frame->skb; | |
863 | kfree(frame); | |
c5d3687f | 864 | |
865 | if (lowpan_fetch_skb_u8(skb, &iphc0)) | |
747cf6ed | 866 | goto drop; |
c5d3687f | 867 | |
719269af | 868 | break; |
869 | } | |
33c34c5e | 870 | spin_unlock_bh(&flist_lock); |
719269af | 871 | |
872 | return kfree_skb(skb), 0; | |
873 | } | |
874 | default: | |
875 | break; | |
876 | } | |
877 | ||
c5d3687f | 878 | if (lowpan_fetch_skb_u8(skb, &iphc1)) |
879 | goto drop; | |
44331fe2 AS |
880 | |
881 | _saddr = mac_cb(skb)->sa.hwaddr; | |
882 | _daddr = mac_cb(skb)->da.hwaddr; | |
883 | ||
e71094f9 | 884 | pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1); |
44331fe2 AS |
885 | |
886 | /* another if the CID flag is set */ | |
887 | if (iphc1 & LOWPAN_IPHC_CID) { | |
e71094f9 | 888 | pr_debug("CID flag is set, increase header with one\n"); |
c5d3687f | 889 | if (lowpan_fetch_skb_u8(skb, &num_context)) |
44331fe2 | 890 | goto drop; |
44331fe2 AS |
891 | } |
892 | ||
893 | hdr.version = 6; | |
894 | ||
895 | /* Traffic Class and Flow Label */ | |
896 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
897 | /* | |
898 | * Traffic Class and FLow Label carried in-line | |
899 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
900 | */ | |
901 | case 0: /* 00b */ | |
c5d3687f | 902 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 903 | goto drop; |
c5d3687f | 904 | |
44331fe2 AS |
905 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
906 | skb_pull(skb, 3); | |
907 | hdr.priority = ((tmp >> 2) & 0x0f); | |
908 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
909 | (hdr.flow_lbl[0] & 0x0f); | |
910 | break; | |
911 | /* | |
912 | * Traffic class carried in-line | |
913 | * ECN + DSCP (1 byte), Flow Label is elided | |
914 | */ | |
915 | case 1: /* 10b */ | |
c5d3687f | 916 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 917 | goto drop; |
c5d3687f | 918 | |
44331fe2 AS |
919 | hdr.priority = ((tmp >> 2) & 0x0f); |
920 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
44331fe2 AS |
921 | break; |
922 | /* | |
923 | * Flow Label carried in-line | |
924 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
925 | */ | |
926 | case 2: /* 01b */ | |
c5d3687f | 927 | if (lowpan_fetch_skb_u8(skb, &tmp)) |
44331fe2 | 928 | goto drop; |
c5d3687f | 929 | |
44331fe2 AS |
930 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
931 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
932 | skb_pull(skb, 2); | |
933 | break; | |
934 | /* Traffic Class and Flow Label are elided */ | |
935 | case 3: /* 11b */ | |
44331fe2 AS |
936 | break; |
937 | default: | |
938 | break; | |
939 | } | |
940 | ||
941 | /* Next Header */ | |
942 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
943 | /* Next header is carried inline */ | |
c5d3687f | 944 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) |
44331fe2 | 945 | goto drop; |
c5d3687f | 946 | |
e71094f9 | 947 | pr_debug("NH flag is set, next header carried inline: %02x\n", |
948 | hdr.nexthdr); | |
44331fe2 AS |
949 | } |
950 | ||
951 | /* Hop Limit */ | |
952 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
953 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
954 | else { | |
c5d3687f | 955 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
44331fe2 | 956 | goto drop; |
44331fe2 AS |
957 | } |
958 | ||
959 | /* Extract SAM to the tmp variable */ | |
960 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
961 | ||
962 | /* Source address uncompression */ | |
e71094f9 | 963 | pr_debug("source address stateless compression\n"); |
44331fe2 AS |
964 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, |
965 | lowpan_unc_llconf[tmp], skb->data); | |
966 | if (err) | |
967 | goto drop; | |
968 | ||
969 | /* Extract DAM to the tmp variable */ | |
970 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
971 | ||
972 | /* check for Multicast Compression */ | |
973 | if (iphc1 & LOWPAN_IPHC_M) { | |
974 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
e71094f9 | 975 | pr_debug("dest: context-based mcast compression\n"); |
44331fe2 AS |
976 | /* TODO: implement this */ |
977 | } else { | |
84c2e7bc AA |
978 | err = lowpan_uncompress_multicast_daddr( |
979 | skb, &hdr.daddr, tmp); | |
44331fe2 AS |
980 | if (err) |
981 | goto drop; | |
982 | } | |
983 | } else { | |
e71094f9 | 984 | pr_debug("dest: stateless compression\n"); |
44331fe2 AS |
985 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, |
986 | lowpan_unc_llconf[tmp], skb->data); | |
987 | if (err) | |
988 | goto drop; | |
989 | } | |
990 | ||
f8b1b5d2 | 991 | /* UDP data uncompression */ |
f5c20f58 | 992 | if (iphc0 & LOWPAN_IPHC_NH_C) { |
24363b67 TC |
993 | struct udphdr uh; |
994 | struct sk_buff *new; | |
995 | if (lowpan_uncompress_udp_header(skb, &uh)) | |
f8b1b5d2 | 996 | goto drop; |
24363b67 TC |
997 | |
998 | /* | |
999 | * replace the compressed UDP head by the uncompressed UDP | |
1000 | * header | |
1001 | */ | |
1002 | new = skb_copy_expand(skb, sizeof(struct udphdr), | |
1003 | skb_tailroom(skb), GFP_ATOMIC); | |
1004 | kfree_skb(skb); | |
1005 | ||
1006 | if (!new) | |
1007 | return -ENOMEM; | |
1008 | ||
1009 | skb = new; | |
1010 | ||
1011 | skb_push(skb, sizeof(struct udphdr)); | |
1012 | skb_reset_transport_header(skb); | |
1013 | skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr)); | |
1014 | ||
1015 | lowpan_raw_dump_table(__func__, "raw UDP header dump", | |
1016 | (u8 *)&uh, sizeof(uh)); | |
1017 | ||
f5c20f58 TC |
1018 | hdr.nexthdr = UIP_PROTO_UDP; |
1019 | } | |
44331fe2 AS |
1020 | |
1021 | /* Not fragmented package */ | |
1022 | hdr.payload_len = htons(skb->len); | |
1023 | ||
e71094f9 | 1024 | pr_debug("skb headroom size = %d, data length = %d\n", |
1025 | skb_headroom(skb), skb->len); | |
44331fe2 | 1026 | |
e71094f9 | 1027 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
1028 | "nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version, | |
44331fe2 AS |
1029 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
1030 | ||
1031 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
1032 | sizeof(hdr)); | |
1033 | return lowpan_skb_deliver(skb, &hdr); | |
719269af | 1034 | |
1035 | unlock_and_drop: | |
33c34c5e | 1036 | spin_unlock_bh(&flist_lock); |
44331fe2 | 1037 | drop: |
90d0963d | 1038 | kfree_skb(skb); |
44331fe2 AS |
1039 | return -EINVAL; |
1040 | } | |
1041 | ||
42c36295 | 1042 | static int lowpan_set_address(struct net_device *dev, void *p) |
1043 | { | |
1044 | struct sockaddr *sa = p; | |
1045 | ||
1046 | if (netif_running(dev)) | |
1047 | return -EBUSY; | |
1048 | ||
1049 | /* TODO: validate addr */ | |
1050 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
719269af | 1055 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
1056 | { | |
1057 | /* | |
1058 | * Currently long addressing mode is supported only, so the overall | |
1059 | * header size is 21: | |
1060 | * FC SeqNum DPAN DA SA Sec | |
1061 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 | |
1062 | */ | |
1063 | return 21; | |
1064 | } | |
1065 | ||
1066 | static int | |
1067 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, | |
d991b98f | 1068 | int mlen, int plen, int offset, int type) |
719269af | 1069 | { |
1070 | struct sk_buff *frag; | |
1071 | int hlen, ret; | |
1072 | ||
d991b98f TC |
1073 | hlen = (type == LOWPAN_DISPATCH_FRAG1) ? |
1074 | LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE; | |
719269af | 1075 | |
1076 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); | |
1077 | ||
1078 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); | |
1079 | if (!frag) | |
1080 | return -ENOMEM; | |
1081 | ||
1082 | frag->priority = skb->priority; | |
1083 | frag->dev = skb->dev; | |
1084 | ||
1085 | /* copy header, MFR and payload */ | |
1086 | memcpy(skb_put(frag, mlen), skb->data, mlen); | |
1087 | memcpy(skb_put(frag, hlen), head, hlen); | |
1088 | ||
1089 | if (plen) | |
1090 | skb_copy_from_linear_data_offset(skb, offset + mlen, | |
1091 | skb_put(frag, plen), plen); | |
1092 | ||
1093 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, | |
1094 | frag->len); | |
1095 | ||
1096 | ret = dev_queue_xmit(frag); | |
1097 | ||
719269af | 1098 | return ret; |
1099 | } | |
1100 | ||
1101 | static int | |
d4ac3236 | 1102 | lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev) |
719269af | 1103 | { |
1104 | int err, header_length, payload_length, tag, offset = 0; | |
1105 | u8 head[5]; | |
1106 | ||
1107 | header_length = lowpan_get_mac_header_length(skb); | |
1108 | payload_length = skb->len - header_length; | |
d4ac3236 | 1109 | tag = lowpan_dev_info(dev)->fragment_tag++; |
719269af | 1110 | |
1111 | /* first fragment header */ | |
5e96855f TC |
1112 | head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7); |
1113 | head[1] = payload_length & 0xff; | |
4576039f TC |
1114 | head[2] = tag >> 8; |
1115 | head[3] = tag & 0xff; | |
719269af | 1116 | |
d991b98f TC |
1117 | err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE, |
1118 | 0, LOWPAN_DISPATCH_FRAG1); | |
1119 | ||
9da2924c TC |
1120 | if (err) { |
1121 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
1122 | __func__, tag); | |
d991b98f | 1123 | goto exit; |
9da2924c | 1124 | } |
d991b98f TC |
1125 | |
1126 | offset = LOWPAN_FRAG_SIZE; | |
719269af | 1127 | |
1128 | /* next fragment header */ | |
1129 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
1130 | head[0] |= LOWPAN_DISPATCH_FRAGN; | |
1131 | ||
1132 | while ((payload_length - offset > 0) && (err >= 0)) { | |
1133 | int len = LOWPAN_FRAG_SIZE; | |
1134 | ||
1135 | head[4] = offset / 8; | |
1136 | ||
1137 | if (payload_length - offset < len) | |
1138 | len = payload_length - offset; | |
1139 | ||
1140 | err = lowpan_fragment_xmit(skb, head, header_length, | |
d991b98f | 1141 | len, offset, LOWPAN_DISPATCH_FRAGN); |
9da2924c TC |
1142 | if (err) { |
1143 | pr_debug("%s unable to send a subsequent FRAGN packet " | |
1144 | "(tag: %d, offset: %d", __func__, tag, offset); | |
d991b98f | 1145 | goto exit; |
9da2924c | 1146 | } |
d991b98f | 1147 | |
719269af | 1148 | offset += len; |
1149 | } | |
1150 | ||
d991b98f | 1151 | exit: |
719269af | 1152 | return err; |
1153 | } | |
1154 | ||
44331fe2 AS |
1155 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
1156 | { | |
719269af | 1157 | int err = -1; |
44331fe2 | 1158 | |
e71094f9 | 1159 | pr_debug("package xmit\n"); |
44331fe2 AS |
1160 | |
1161 | skb->dev = lowpan_dev_info(dev)->real_dev; | |
1162 | if (skb->dev == NULL) { | |
e71094f9 | 1163 | pr_debug("ERROR: no real wpan device found\n"); |
719269af | 1164 | goto error; |
1165 | } | |
1166 | ||
b333b7e6 AO |
1167 | /* Send directly if less than the MTU minus the 2 checksum bytes. */ |
1168 | if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) { | |
44331fe2 | 1169 | err = dev_queue_xmit(skb); |
719269af | 1170 | goto out; |
1171 | } | |
1172 | ||
e71094f9 | 1173 | pr_debug("frame is too big, fragmentation is needed\n"); |
d4ac3236 | 1174 | err = lowpan_skb_fragmentation(skb, dev); |
719269af | 1175 | error: |
1176 | dev_kfree_skb(skb); | |
1177 | out: | |
fc52eea4 | 1178 | if (err) |
e71094f9 | 1179 | pr_debug("ERROR: xmit failed\n"); |
44331fe2 | 1180 | |
fc52eea4 | 1181 | return (err < 0) ? NET_XMIT_DROP : err; |
44331fe2 AS |
1182 | } |
1183 | ||
0848e404 | 1184 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
1185 | { | |
1186 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1187 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); | |
1188 | } | |
1189 | ||
1190 | static u16 lowpan_get_pan_id(const struct net_device *dev) | |
1191 | { | |
1192 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1193 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); | |
1194 | } | |
1195 | ||
1196 | static u16 lowpan_get_short_addr(const struct net_device *dev) | |
1197 | { | |
1198 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1199 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); | |
1200 | } | |
1201 | ||
c7d0ab28 TC |
1202 | static u8 lowpan_get_dsn(const struct net_device *dev) |
1203 | { | |
1204 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; | |
1205 | return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev); | |
1206 | } | |
1207 | ||
44331fe2 AS |
1208 | static struct header_ops lowpan_header_ops = { |
1209 | .create = lowpan_header_create, | |
1210 | }; | |
1211 | ||
1212 | static const struct net_device_ops lowpan_netdev_ops = { | |
1213 | .ndo_start_xmit = lowpan_xmit, | |
42c36295 | 1214 | .ndo_set_mac_address = lowpan_set_address, |
44331fe2 AS |
1215 | }; |
1216 | ||
0848e404 | 1217 | static struct ieee802154_mlme_ops lowpan_mlme = { |
1218 | .get_pan_id = lowpan_get_pan_id, | |
1219 | .get_phy = lowpan_get_phy, | |
1220 | .get_short_addr = lowpan_get_short_addr, | |
c7d0ab28 | 1221 | .get_dsn = lowpan_get_dsn, |
0848e404 | 1222 | }; |
1223 | ||
44331fe2 AS |
1224 | static void lowpan_setup(struct net_device *dev) |
1225 | { | |
44331fe2 AS |
1226 | dev->addr_len = IEEE802154_ADDR_LEN; |
1227 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); | |
1228 | dev->type = ARPHRD_IEEE802154; | |
44331fe2 AS |
1229 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
1230 | dev->hard_header_len = 2 + 1 + 20 + 14; | |
1231 | dev->needed_tailroom = 2; /* FCS */ | |
1232 | dev->mtu = 1281; | |
1233 | dev->tx_queue_len = 0; | |
4d039f68 | 1234 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
44331fe2 AS |
1235 | dev->watchdog_timeo = 0; |
1236 | ||
1237 | dev->netdev_ops = &lowpan_netdev_ops; | |
1238 | dev->header_ops = &lowpan_header_ops; | |
0848e404 | 1239 | dev->ml_priv = &lowpan_mlme; |
a2dc375e | 1240 | dev->destructor = free_netdev; |
44331fe2 AS |
1241 | } |
1242 | ||
1243 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1244 | { | |
44331fe2 AS |
1245 | if (tb[IFLA_ADDRESS]) { |
1246 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) | |
1247 | return -EINVAL; | |
1248 | } | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, | |
1253 | struct packet_type *pt, struct net_device *orig_dev) | |
1254 | { | |
a437d274 AO |
1255 | struct sk_buff *local_skb; |
1256 | ||
44331fe2 AS |
1257 | if (!netif_running(dev)) |
1258 | goto drop; | |
1259 | ||
1260 | if (dev->type != ARPHRD_IEEE802154) | |
1261 | goto drop; | |
1262 | ||
1263 | /* check that it's our buffer */ | |
ee21c7e0 AO |
1264 | if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { |
1265 | /* Copy the packet so that the IPv6 header is | |
1266 | * properly aligned. | |
1267 | */ | |
1268 | local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1, | |
1269 | skb_tailroom(skb), GFP_ATOMIC); | |
a437d274 AO |
1270 | if (!local_skb) |
1271 | goto drop; | |
a437d274 | 1272 | |
ee21c7e0 AO |
1273 | local_skb->protocol = htons(ETH_P_IPV6); |
1274 | local_skb->pkt_type = PACKET_HOST; | |
1275 | ||
1276 | /* Pull off the 1-byte of 6lowpan header. */ | |
1277 | skb_pull(local_skb, 1); | |
1278 | skb_reset_network_header(local_skb); | |
1279 | skb_set_transport_header(local_skb, sizeof(struct ipv6hdr)); | |
1280 | ||
1281 | lowpan_give_skb_to_devices(local_skb); | |
1282 | ||
1283 | kfree_skb(local_skb); | |
a437d274 | 1284 | kfree_skb(skb); |
ee21c7e0 AO |
1285 | } else { |
1286 | switch (skb->data[0] & 0xe0) { | |
1287 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ | |
1288 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ | |
1289 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ | |
1290 | local_skb = skb_clone(skb, GFP_ATOMIC); | |
1291 | if (!local_skb) | |
1292 | goto drop; | |
1293 | lowpan_process_data(local_skb); | |
1294 | ||
1295 | kfree_skb(skb); | |
1296 | break; | |
1297 | default: | |
1298 | break; | |
1299 | } | |
719269af | 1300 | } |
44331fe2 AS |
1301 | |
1302 | return NET_RX_SUCCESS; | |
1303 | ||
1304 | drop: | |
1305 | kfree_skb(skb); | |
1306 | return NET_RX_DROP; | |
1307 | } | |
1308 | ||
1309 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, | |
1310 | struct nlattr *tb[], struct nlattr *data[]) | |
1311 | { | |
1312 | struct net_device *real_dev; | |
1313 | struct lowpan_dev_record *entry; | |
1314 | ||
e71094f9 | 1315 | pr_debug("adding new link\n"); |
44331fe2 AS |
1316 | |
1317 | if (!tb[IFLA_LINK]) | |
1318 | return -EINVAL; | |
1319 | /* find and hold real wpan device */ | |
1320 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); | |
1321 | if (!real_dev) | |
1322 | return -ENODEV; | |
1323 | ||
1324 | lowpan_dev_info(dev)->real_dev = real_dev; | |
d4ac3236 | 1325 | lowpan_dev_info(dev)->fragment_tag = 0; |
44331fe2 AS |
1326 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); |
1327 | ||
1328 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); | |
dc00fd44 DC |
1329 | if (!entry) { |
1330 | dev_put(real_dev); | |
1331 | lowpan_dev_info(dev)->real_dev = NULL; | |
44331fe2 | 1332 | return -ENOMEM; |
dc00fd44 | 1333 | } |
44331fe2 AS |
1334 | |
1335 | entry->ldev = dev; | |
1336 | ||
1337 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1338 | INIT_LIST_HEAD(&entry->list); | |
1339 | list_add_tail(&entry->list, &lowpan_devices); | |
1340 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); | |
1341 | ||
1342 | register_netdevice(dev); | |
1343 | ||
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) | |
1348 | { | |
1349 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); | |
1350 | struct net_device *real_dev = lowpan_dev->real_dev; | |
8deff4af | 1351 | struct lowpan_dev_record *entry, *tmp; |
44331fe2 AS |
1352 | |
1353 | ASSERT_RTNL(); | |
1354 | ||
1355 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); | |
aec9db35 | 1356 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
44331fe2 AS |
1357 | if (entry->ldev == dev) { |
1358 | list_del(&entry->list); | |
1359 | kfree(entry); | |
1360 | } | |
aec9db35 | 1361 | } |
44331fe2 AS |
1362 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
1363 | ||
1364 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); | |
1365 | ||
1366 | unregister_netdevice_queue(dev, head); | |
1367 | ||
1368 | dev_put(real_dev); | |
1369 | } | |
1370 | ||
1371 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { | |
1372 | .kind = "lowpan", | |
1373 | .priv_size = sizeof(struct lowpan_dev_info), | |
1374 | .setup = lowpan_setup, | |
1375 | .newlink = lowpan_newlink, | |
1376 | .dellink = lowpan_dellink, | |
1377 | .validate = lowpan_validate, | |
1378 | }; | |
1379 | ||
1380 | static inline int __init lowpan_netlink_init(void) | |
1381 | { | |
1382 | return rtnl_link_register(&lowpan_link_ops); | |
1383 | } | |
1384 | ||
a07fdcec | 1385 | static inline void lowpan_netlink_fini(void) |
44331fe2 AS |
1386 | { |
1387 | rtnl_link_unregister(&lowpan_link_ops); | |
1388 | } | |
1389 | ||
a2dc375e | 1390 | static int lowpan_device_event(struct notifier_block *unused, |
351638e7 | 1391 | unsigned long event, void *ptr) |
a2dc375e | 1392 | { |
351638e7 | 1393 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
a2dc375e AO |
1394 | LIST_HEAD(del_list); |
1395 | struct lowpan_dev_record *entry, *tmp; | |
1396 | ||
1397 | if (dev->type != ARPHRD_IEEE802154) | |
1398 | goto out; | |
1399 | ||
1400 | if (event == NETDEV_UNREGISTER) { | |
1401 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { | |
1402 | if (lowpan_dev_info(entry->ldev)->real_dev == dev) | |
1403 | lowpan_dellink(entry->ldev, &del_list); | |
1404 | } | |
1405 | ||
1406 | unregister_netdevice_many(&del_list); | |
4c835019 | 1407 | } |
a2dc375e AO |
1408 | |
1409 | out: | |
1410 | return NOTIFY_DONE; | |
1411 | } | |
1412 | ||
1413 | static struct notifier_block lowpan_dev_notifier = { | |
1414 | .notifier_call = lowpan_device_event, | |
1415 | }; | |
1416 | ||
44331fe2 AS |
1417 | static struct packet_type lowpan_packet_type = { |
1418 | .type = __constant_htons(ETH_P_IEEE802154), | |
1419 | .func = lowpan_rcv, | |
1420 | }; | |
1421 | ||
1422 | static int __init lowpan_init_module(void) | |
1423 | { | |
1424 | int err = 0; | |
1425 | ||
44331fe2 AS |
1426 | err = lowpan_netlink_init(); |
1427 | if (err < 0) | |
1428 | goto out; | |
1429 | ||
1430 | dev_add_pack(&lowpan_packet_type); | |
a2dc375e AO |
1431 | |
1432 | err = register_netdevice_notifier(&lowpan_dev_notifier); | |
1433 | if (err < 0) { | |
1434 | dev_remove_pack(&lowpan_packet_type); | |
1435 | lowpan_netlink_fini(); | |
1436 | } | |
44331fe2 AS |
1437 | out: |
1438 | return err; | |
1439 | } | |
1440 | ||
1441 | static void __exit lowpan_cleanup_module(void) | |
1442 | { | |
33c34c5e | 1443 | struct lowpan_fragment *frame, *tframe; |
1444 | ||
44331fe2 AS |
1445 | lowpan_netlink_fini(); |
1446 | ||
1447 | dev_remove_pack(&lowpan_packet_type); | |
33c34c5e | 1448 | |
a2dc375e AO |
1449 | unregister_netdevice_notifier(&lowpan_dev_notifier); |
1450 | ||
33c34c5e | 1451 | /* Now 6lowpan packet_type is removed, so no new fragments are |
1452 | * expected on RX, therefore that's the time to clean incomplete | |
1453 | * fragments. | |
1454 | */ | |
1455 | spin_lock_bh(&flist_lock); | |
1456 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { | |
1457 | del_timer_sync(&frame->timer); | |
1458 | list_del(&frame->list); | |
1459 | dev_kfree_skb(frame->skb); | |
1460 | kfree(frame); | |
1461 | } | |
1462 | spin_unlock_bh(&flist_lock); | |
44331fe2 AS |
1463 | } |
1464 | ||
1465 | module_init(lowpan_init_module); | |
1466 | module_exit(lowpan_cleanup_module); | |
1467 | MODULE_LICENSE("GPL"); | |
1468 | MODULE_ALIAS_RTNL_LINK("lowpan"); |