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Commit | Line | Data |
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8df8c56a JR |
1 | /* |
2 | * Copyright 2011, Siemens AG | |
3 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
4 | */ | |
5 | ||
4710d806 | 6 | /* Based on patches from Jon Smirl <jonsmirl@gmail.com> |
8df8c56a JR |
7 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
8df8c56a JR |
18 | */ |
19 | ||
20 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
21 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
22 | * All rights reserved. | |
23 | * | |
24 | * Redistribution and use in source and binary forms, with or without | |
25 | * modification, are permitted provided that the following conditions | |
26 | * are met: | |
27 | * 1. Redistributions of source code must retain the above copyright | |
28 | * notice, this list of conditions and the following disclaimer. | |
29 | * 2. Redistributions in binary form must reproduce the above copyright | |
30 | * notice, this list of conditions and the following disclaimer in the | |
31 | * documentation and/or other materials provided with the distribution. | |
32 | * 3. Neither the name of the Institute nor the names of its contributors | |
33 | * may be used to endorse or promote products derived from this software | |
34 | * without specific prior written permission. | |
35 | * | |
36 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
37 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
39 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
40 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
41 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
42 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
43 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
44 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
45 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
46 | * SUCH DAMAGE. | |
47 | */ | |
48 | ||
49 | #include <linux/bitops.h> | |
50 | #include <linux/if_arp.h> | |
51 | #include <linux/netdevice.h> | |
8911d774 | 52 | |
cefc8c8a | 53 | #include <net/6lowpan.h> |
8df8c56a | 54 | #include <net/ipv6.h> |
8911d774 AA |
55 | |
56 | /* special link-layer handling */ | |
57 | #include <net/mac802154.h> | |
8df8c56a | 58 | |
cc6ed268 AA |
59 | #include "nhc.h" |
60 | ||
c8a3e7eb AA |
61 | /* Values of fields within the IPHC encoding first byte */ |
62 | #define LOWPAN_IPHC_TF_MASK 0x18 | |
63 | #define LOWPAN_IPHC_TF_00 0x00 | |
64 | #define LOWPAN_IPHC_TF_01 0x08 | |
65 | #define LOWPAN_IPHC_TF_10 0x10 | |
66 | #define LOWPAN_IPHC_TF_11 0x18 | |
67 | ||
68 | #define LOWPAN_IPHC_NH 0x04 | |
6350047e | 69 | |
c8a3e7eb AA |
70 | #define LOWPAN_IPHC_HLIM_MASK 0x03 |
71 | #define LOWPAN_IPHC_HLIM_00 0x00 | |
72 | #define LOWPAN_IPHC_HLIM_01 0x01 | |
73 | #define LOWPAN_IPHC_HLIM_10 0x02 | |
74 | #define LOWPAN_IPHC_HLIM_11 0x03 | |
6350047e AA |
75 | |
76 | /* Values of fields within the IPHC encoding second byte */ | |
77 | #define LOWPAN_IPHC_CID 0x80 | |
78 | ||
6350047e | 79 | #define LOWPAN_IPHC_SAC 0x40 |
6350047e | 80 | |
c8a3e7eb AA |
81 | #define LOWPAN_IPHC_SAM_MASK 0x30 |
82 | #define LOWPAN_IPHC_SAM_00 0x00 | |
83 | #define LOWPAN_IPHC_SAM_01 0x10 | |
84 | #define LOWPAN_IPHC_SAM_10 0x20 | |
85 | #define LOWPAN_IPHC_SAM_11 0x30 | |
6350047e AA |
86 | |
87 | #define LOWPAN_IPHC_M 0x08 | |
c8a3e7eb | 88 | |
6350047e | 89 | #define LOWPAN_IPHC_DAC 0x04 |
c8a3e7eb AA |
90 | |
91 | #define LOWPAN_IPHC_DAM_MASK 0x03 | |
6350047e AA |
92 | #define LOWPAN_IPHC_DAM_00 0x00 |
93 | #define LOWPAN_IPHC_DAM_01 0x01 | |
94 | #define LOWPAN_IPHC_DAM_10 0x02 | |
95 | #define LOWPAN_IPHC_DAM_11 0x03 | |
96 | ||
6350047e AA |
97 | /* ipv6 address based on mac |
98 | * second bit-flip (Universe/Local) is done according RFC2464 | |
99 | */ | |
100 | #define is_addr_mac_addr_based(a, m) \ | |
101 | ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \ | |
102 | (((a)->s6_addr[9]) == (m)[1]) && \ | |
103 | (((a)->s6_addr[10]) == (m)[2]) && \ | |
104 | (((a)->s6_addr[11]) == (m)[3]) && \ | |
105 | (((a)->s6_addr[12]) == (m)[4]) && \ | |
106 | (((a)->s6_addr[13]) == (m)[5]) && \ | |
107 | (((a)->s6_addr[14]) == (m)[6]) && \ | |
108 | (((a)->s6_addr[15]) == (m)[7])) | |
109 | ||
110 | /* check whether we can compress the IID to 16 bits, | |
111 | * it's possible for unicast addresses with first 49 bits are zero only. | |
112 | */ | |
113 | #define lowpan_is_iid_16_bit_compressable(a) \ | |
114 | ((((a)->s6_addr16[4]) == 0) && \ | |
115 | (((a)->s6_addr[10]) == 0) && \ | |
116 | (((a)->s6_addr[11]) == 0xff) && \ | |
117 | (((a)->s6_addr[12]) == 0xfe) && \ | |
118 | (((a)->s6_addr[13]) == 0)) | |
119 | ||
120 | /* check whether the 112-bit gid of the multicast address is mappable to: */ | |
121 | ||
122 | /* 48 bits, FFXX::00XX:XXXX:XXXX */ | |
123 | #define lowpan_is_mcast_addr_compressable48(a) \ | |
124 | ((((a)->s6_addr16[1]) == 0) && \ | |
125 | (((a)->s6_addr16[2]) == 0) && \ | |
126 | (((a)->s6_addr16[3]) == 0) && \ | |
127 | (((a)->s6_addr16[4]) == 0) && \ | |
128 | (((a)->s6_addr[10]) == 0)) | |
129 | ||
130 | /* 32 bits, FFXX::00XX:XXXX */ | |
131 | #define lowpan_is_mcast_addr_compressable32(a) \ | |
132 | ((((a)->s6_addr16[1]) == 0) && \ | |
133 | (((a)->s6_addr16[2]) == 0) && \ | |
134 | (((a)->s6_addr16[3]) == 0) && \ | |
135 | (((a)->s6_addr16[4]) == 0) && \ | |
136 | (((a)->s6_addr16[5]) == 0) && \ | |
137 | (((a)->s6_addr[12]) == 0)) | |
138 | ||
139 | /* 8 bits, FF02::00XX */ | |
140 | #define lowpan_is_mcast_addr_compressable8(a) \ | |
141 | ((((a)->s6_addr[1]) == 2) && \ | |
142 | (((a)->s6_addr16[1]) == 0) && \ | |
143 | (((a)->s6_addr16[2]) == 0) && \ | |
144 | (((a)->s6_addr16[3]) == 0) && \ | |
145 | (((a)->s6_addr16[4]) == 0) && \ | |
146 | (((a)->s6_addr16[5]) == 0) && \ | |
147 | (((a)->s6_addr16[6]) == 0) && \ | |
148 | (((a)->s6_addr[14]) == 0)) | |
149 | ||
8911d774 AA |
150 | static inline void iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr, |
151 | const void *lladdr) | |
152 | { | |
153 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
154 | * \_________________/ | |
155 | * hwaddr | |
156 | */ | |
157 | ipaddr->s6_addr[0] = 0xFE; | |
158 | ipaddr->s6_addr[1] = 0x80; | |
159 | memcpy(&ipaddr->s6_addr[8], lladdr, EUI64_ADDR_LEN); | |
160 | /* second bit-flip (Universe/Local) | |
161 | * is done according RFC2464 | |
162 | */ | |
163 | ipaddr->s6_addr[8] ^= 0x02; | |
164 | } | |
165 | ||
166 | static inline void iphc_uncompress_802154_lladdr(struct in6_addr *ipaddr, | |
167 | const void *lladdr) | |
168 | { | |
169 | const struct ieee802154_addr *addr = lladdr; | |
170 | u8 eui64[EUI64_ADDR_LEN] = { }; | |
171 | ||
172 | switch (addr->mode) { | |
173 | case IEEE802154_ADDR_LONG: | |
174 | ieee802154_le64_to_be64(eui64, &addr->extended_addr); | |
175 | iphc_uncompress_eui64_lladdr(ipaddr, eui64); | |
176 | break; | |
177 | case IEEE802154_ADDR_SHORT: | |
178 | /* fe:80::ff:fe00:XXXX | |
179 | * \__/ | |
180 | * short_addr | |
181 | * | |
182 | * Universe/Local bit is zero. | |
183 | */ | |
184 | ipaddr->s6_addr[0] = 0xFE; | |
185 | ipaddr->s6_addr[1] = 0x80; | |
186 | ipaddr->s6_addr[11] = 0xFF; | |
187 | ipaddr->s6_addr[12] = 0xFE; | |
188 | ieee802154_le16_to_be16(&ipaddr->s6_addr16[7], | |
189 | &addr->short_addr); | |
190 | break; | |
191 | default: | |
192 | /* should never handled and filtered by 802154 6lowpan */ | |
193 | WARN_ON_ONCE(1); | |
194 | break; | |
195 | } | |
196 | } | |
197 | ||
4710d806 | 198 | /* Uncompress address function for source and |
8df8c56a JR |
199 | * destination address(non-multicast). |
200 | * | |
c8a3e7eb | 201 | * address_mode is the masked value for sam or dam value |
8df8c56a | 202 | */ |
8911d774 AA |
203 | static int uncompress_addr(struct sk_buff *skb, const struct net_device *dev, |
204 | struct in6_addr *ipaddr, u8 address_mode, | |
205 | const void *lladdr) | |
8df8c56a JR |
206 | { |
207 | bool fail; | |
208 | ||
209 | switch (address_mode) { | |
c8a3e7eb AA |
210 | /* SAM and DAM are the same here */ |
211 | case LOWPAN_IPHC_DAM_00: | |
8df8c56a JR |
212 | /* for global link addresses */ |
213 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
214 | break; | |
c8a3e7eb AA |
215 | case LOWPAN_IPHC_SAM_01: |
216 | case LOWPAN_IPHC_DAM_01: | |
8df8c56a JR |
217 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ |
218 | ipaddr->s6_addr[0] = 0xFE; | |
219 | ipaddr->s6_addr[1] = 0x80; | |
220 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
221 | break; | |
c8a3e7eb AA |
222 | case LOWPAN_IPHC_SAM_10: |
223 | case LOWPAN_IPHC_DAM_10: | |
8df8c56a JR |
224 | /* fe:80::ff:fe00:XXXX */ |
225 | ipaddr->s6_addr[0] = 0xFE; | |
226 | ipaddr->s6_addr[1] = 0x80; | |
227 | ipaddr->s6_addr[11] = 0xFF; | |
228 | ipaddr->s6_addr[12] = 0xFE; | |
229 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
230 | break; | |
c8a3e7eb AA |
231 | case LOWPAN_IPHC_SAM_11: |
232 | case LOWPAN_IPHC_DAM_11: | |
8df8c56a | 233 | fail = false; |
8911d774 AA |
234 | switch (lowpan_priv(dev)->lltype) { |
235 | case LOWPAN_LLTYPE_IEEE802154: | |
236 | iphc_uncompress_802154_lladdr(ipaddr, lladdr); | |
8df8c56a JR |
237 | break; |
238 | default: | |
8911d774 AA |
239 | iphc_uncompress_eui64_lladdr(ipaddr, lladdr); |
240 | break; | |
8df8c56a JR |
241 | } |
242 | break; | |
243 | default: | |
244 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | if (fail) { | |
249 | pr_debug("Failed to fetch skb data\n"); | |
250 | return -EIO; | |
251 | } | |
252 | ||
253 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
254 | ipaddr->s6_addr, 16); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
4710d806 | 259 | /* Uncompress address function for source context |
8df8c56a JR |
260 | * based address(non-multicast). |
261 | */ | |
262 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
4710d806 | 263 | struct in6_addr *ipaddr, |
c8a3e7eb | 264 | u8 address_mode) |
8df8c56a | 265 | { |
c8a3e7eb AA |
266 | switch (address_mode) { |
267 | case LOWPAN_IPHC_SAM_00: | |
8df8c56a JR |
268 | /* unspec address :: |
269 | * Do nothing, address is already :: | |
270 | */ | |
271 | break; | |
c8a3e7eb | 272 | case LOWPAN_IPHC_SAM_01: |
8df8c56a | 273 | /* TODO */ |
c8a3e7eb | 274 | case LOWPAN_IPHC_SAM_10: |
8df8c56a | 275 | /* TODO */ |
c8a3e7eb | 276 | case LOWPAN_IPHC_SAM_11: |
8df8c56a | 277 | /* TODO */ |
c8a3e7eb AA |
278 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", |
279 | address_mode); | |
8df8c56a JR |
280 | return -EINVAL; |
281 | default: | |
c8a3e7eb | 282 | pr_debug("Invalid sam value: 0x%x\n", address_mode); |
8df8c56a JR |
283 | return -EINVAL; |
284 | } | |
285 | ||
286 | raw_dump_inline(NULL, | |
287 | "Reconstructed context based ipv6 src addr is", | |
288 | ipaddr->s6_addr, 16); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
8df8c56a JR |
293 | /* Uncompress function for multicast destination address, |
294 | * when M bit is set. | |
295 | */ | |
7fc4cfda MH |
296 | static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb, |
297 | struct in6_addr *ipaddr, | |
c8a3e7eb | 298 | u8 address_mode) |
8df8c56a JR |
299 | { |
300 | bool fail; | |
301 | ||
c8a3e7eb | 302 | switch (address_mode) { |
8df8c56a JR |
303 | case LOWPAN_IPHC_DAM_00: |
304 | /* 00: 128 bits. The full address | |
305 | * is carried in-line. | |
306 | */ | |
307 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
308 | break; | |
309 | case LOWPAN_IPHC_DAM_01: | |
310 | /* 01: 48 bits. The address takes | |
311 | * the form ffXX::00XX:XXXX:XXXX. | |
312 | */ | |
313 | ipaddr->s6_addr[0] = 0xFF; | |
314 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
315 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
316 | break; | |
317 | case LOWPAN_IPHC_DAM_10: | |
318 | /* 10: 32 bits. The address takes | |
319 | * the form ffXX::00XX:XXXX. | |
320 | */ | |
321 | ipaddr->s6_addr[0] = 0xFF; | |
322 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
323 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
324 | break; | |
325 | case LOWPAN_IPHC_DAM_11: | |
326 | /* 11: 8 bits. The address takes | |
327 | * the form ff02::00XX. | |
328 | */ | |
329 | ipaddr->s6_addr[0] = 0xFF; | |
330 | ipaddr->s6_addr[1] = 0x02; | |
331 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
332 | break; | |
333 | default: | |
c8a3e7eb | 334 | pr_debug("DAM value has a wrong value: 0x%x\n", address_mode); |
8df8c56a JR |
335 | return -EINVAL; |
336 | } | |
337 | ||
338 | if (fail) { | |
339 | pr_debug("Failed to fetch skb data\n"); | |
340 | return -EIO; | |
341 | } | |
342 | ||
343 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
7fc4cfda | 344 | ipaddr->s6_addr, 16); |
8df8c56a JR |
345 | |
346 | return 0; | |
347 | } | |
348 | ||
b5af9bdb AA |
349 | /* get the ecn values from iphc tf format and set it to ipv6hdr */ |
350 | static inline void lowpan_iphc_tf_set_ecn(struct ipv6hdr *hdr, const u8 *tf) | |
351 | { | |
352 | /* get the two higher bits which is ecn */ | |
353 | u8 ecn = tf[0] & 0xc0; | |
354 | ||
355 | /* ECN takes 0x30 in hdr->flow_lbl[0] */ | |
356 | hdr->flow_lbl[0] |= (ecn >> 2); | |
357 | } | |
358 | ||
359 | /* get the dscp values from iphc tf format and set it to ipv6hdr */ | |
360 | static inline void lowpan_iphc_tf_set_dscp(struct ipv6hdr *hdr, const u8 *tf) | |
361 | { | |
362 | /* DSCP is at place after ECN */ | |
363 | u8 dscp = tf[0] & 0x3f; | |
364 | ||
365 | /* The four highest bits need to be set at hdr->priority */ | |
366 | hdr->priority |= ((dscp & 0x3c) >> 2); | |
367 | /* The two lower bits is part of hdr->flow_lbl[0] */ | |
368 | hdr->flow_lbl[0] |= ((dscp & 0x03) << 6); | |
369 | } | |
370 | ||
371 | /* get the flow label values from iphc tf format and set it to ipv6hdr */ | |
372 | static inline void lowpan_iphc_tf_set_lbl(struct ipv6hdr *hdr, const u8 *lbl) | |
373 | { | |
374 | /* flow label is always some array started with lower nibble of | |
375 | * flow_lbl[0] and followed with two bytes afterwards. Inside inline | |
376 | * data the flow_lbl position can be different, which will be handled | |
377 | * by lbl pointer. E.g. case "01" vs "00" the traffic class is 8 bit | |
378 | * shifted, the different lbl pointer will handle that. | |
379 | * | |
380 | * The flow label will started at lower nibble of flow_lbl[0], the | |
381 | * higher nibbles are part of DSCP + ECN. | |
382 | */ | |
383 | hdr->flow_lbl[0] |= lbl[0] & 0x0f; | |
384 | memcpy(&hdr->flow_lbl[1], &lbl[1], 2); | |
385 | } | |
386 | ||
387 | /* lowpan_iphc_tf_decompress - decompress the traffic class. | |
388 | * This function will return zero on success, a value lower than zero if | |
389 | * failed. | |
390 | */ | |
391 | static int lowpan_iphc_tf_decompress(struct sk_buff *skb, struct ipv6hdr *hdr, | |
392 | u8 val) | |
393 | { | |
394 | u8 tf[4]; | |
395 | ||
396 | /* Traffic Class and Flow Label */ | |
397 | switch (val) { | |
398 | case LOWPAN_IPHC_TF_00: | |
399 | /* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) */ | |
400 | if (lowpan_fetch_skb(skb, tf, 4)) | |
401 | return -EINVAL; | |
402 | ||
403 | /* 1 2 3 | |
404 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
405 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
406 | * |ECN| DSCP | rsv | Flow Label | | |
407 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
408 | */ | |
409 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
410 | lowpan_iphc_tf_set_dscp(hdr, tf); | |
411 | lowpan_iphc_tf_set_lbl(hdr, &tf[1]); | |
412 | break; | |
413 | case LOWPAN_IPHC_TF_01: | |
414 | /* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided. */ | |
415 | if (lowpan_fetch_skb(skb, tf, 3)) | |
416 | return -EINVAL; | |
417 | ||
418 | /* 1 2 | |
419 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 | |
420 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
421 | * |ECN|rsv| Flow Label | | |
422 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
423 | */ | |
424 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
425 | lowpan_iphc_tf_set_lbl(hdr, &tf[0]); | |
426 | break; | |
427 | case LOWPAN_IPHC_TF_10: | |
428 | /* ECN + DSCP (1 byte), Flow Label is elided. */ | |
429 | if (lowpan_fetch_skb(skb, tf, 1)) | |
430 | return -EINVAL; | |
431 | ||
432 | /* 0 1 2 3 4 5 6 7 | |
433 | * +-+-+-+-+-+-+-+-+ | |
434 | * |ECN| DSCP | | |
435 | * +-+-+-+-+-+-+-+-+ | |
436 | */ | |
437 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
438 | lowpan_iphc_tf_set_dscp(hdr, tf); | |
439 | break; | |
440 | case LOWPAN_IPHC_TF_11: | |
441 | /* Traffic Class and Flow Label are elided */ | |
442 | break; | |
443 | default: | |
444 | WARN_ON_ONCE(1); | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
8df8c56a | 451 | /* TTL uncompression values */ |
c8a3e7eb AA |
452 | static const u8 lowpan_ttl_values[] = { |
453 | [LOWPAN_IPHC_HLIM_01] = 1, | |
454 | [LOWPAN_IPHC_HLIM_10] = 64, | |
455 | [LOWPAN_IPHC_HLIM_11] = 255, | |
456 | }; | |
8df8c56a | 457 | |
8911d774 AA |
458 | int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, |
459 | const void *daddr, const void *saddr) | |
8df8c56a JR |
460 | { |
461 | struct ipv6hdr hdr = {}; | |
b5af9bdb | 462 | u8 iphc0, iphc1; |
8df8c56a JR |
463 | int err; |
464 | ||
465 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
4710d806 | 466 | skb->data, skb->len); |
8df8c56a | 467 | |
478208e3 AA |
468 | if (lowpan_fetch_skb(skb, &iphc0, sizeof(iphc0)) || |
469 | lowpan_fetch_skb(skb, &iphc1, sizeof(iphc1))) | |
8911d774 AA |
470 | return -EINVAL; |
471 | ||
8df8c56a | 472 | /* another if the CID flag is set */ |
c8a3e7eb AA |
473 | if (iphc1 & LOWPAN_IPHC_CID) |
474 | return -ENOTSUPP; | |
8df8c56a JR |
475 | |
476 | hdr.version = 6; | |
477 | ||
b5af9bdb AA |
478 | err = lowpan_iphc_tf_decompress(skb, &hdr, |
479 | iphc0 & LOWPAN_IPHC_TF_MASK); | |
480 | if (err < 0) | |
481 | return err; | |
8df8c56a JR |
482 | |
483 | /* Next Header */ | |
c8a3e7eb | 484 | if (!(iphc0 & LOWPAN_IPHC_NH)) { |
8df8c56a | 485 | /* Next header is carried inline */ |
4ebc960f | 486 | if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) |
56b2c3ee | 487 | return -EINVAL; |
8df8c56a JR |
488 | |
489 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
490 | hdr.nexthdr); | |
491 | } | |
492 | ||
493 | /* Hop Limit */ | |
c8a3e7eb AA |
494 | if ((iphc0 & LOWPAN_IPHC_HLIM_MASK) != LOWPAN_IPHC_HLIM_00) { |
495 | hdr.hop_limit = lowpan_ttl_values[iphc0 & LOWPAN_IPHC_HLIM_MASK]; | |
4710d806 | 496 | } else { |
4ebc960f AA |
497 | if (lowpan_fetch_skb(skb, &hdr.hop_limit, |
498 | sizeof(hdr.hop_limit))) | |
56b2c3ee | 499 | return -EINVAL; |
8df8c56a JR |
500 | } |
501 | ||
8df8c56a JR |
502 | if (iphc1 & LOWPAN_IPHC_SAC) { |
503 | /* Source address context based uncompression */ | |
504 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
c8a3e7eb AA |
505 | err = uncompress_context_based_src_addr(skb, &hdr.saddr, |
506 | iphc1 & LOWPAN_IPHC_SAM_MASK); | |
8df8c56a JR |
507 | } else { |
508 | /* Source address uncompression */ | |
509 | pr_debug("source address stateless compression\n"); | |
c8a3e7eb AA |
510 | err = uncompress_addr(skb, dev, &hdr.saddr, |
511 | iphc1 & LOWPAN_IPHC_SAM_MASK, saddr); | |
8df8c56a JR |
512 | } |
513 | ||
514 | /* Check on error of previous branch */ | |
515 | if (err) | |
56b2c3ee | 516 | return -EINVAL; |
8df8c56a | 517 | |
8df8c56a JR |
518 | /* check for Multicast Compression */ |
519 | if (iphc1 & LOWPAN_IPHC_M) { | |
520 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
521 | pr_debug("dest: context-based mcast compression\n"); | |
522 | /* TODO: implement this */ | |
523 | } else { | |
7fc4cfda | 524 | err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr, |
c8a3e7eb | 525 | iphc1 & LOWPAN_IPHC_DAM_MASK); |
7fc4cfda | 526 | |
8df8c56a | 527 | if (err) |
56b2c3ee | 528 | return -EINVAL; |
8df8c56a JR |
529 | } |
530 | } else { | |
c8a3e7eb AA |
531 | err = uncompress_addr(skb, dev, &hdr.daddr, |
532 | iphc1 & LOWPAN_IPHC_DAM_MASK, daddr); | |
8df8c56a | 533 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", |
c8a3e7eb | 534 | iphc1 & LOWPAN_IPHC_DAM_MASK, &hdr.daddr); |
8df8c56a | 535 | if (err) |
56b2c3ee | 536 | return -EINVAL; |
8df8c56a JR |
537 | } |
538 | ||
cc6ed268 | 539 | /* Next header data uncompression */ |
c8a3e7eb | 540 | if (iphc0 & LOWPAN_IPHC_NH) { |
cc6ed268 AA |
541 | err = lowpan_nhc_do_uncompression(skb, dev, &hdr); |
542 | if (err < 0) | |
11e3ff70 | 543 | return err; |
11e3ff70 MT |
544 | } else { |
545 | err = skb_cow(skb, sizeof(hdr)); | |
56b2c3ee | 546 | if (unlikely(err)) |
11e3ff70 | 547 | return err; |
8df8c56a JR |
548 | } |
549 | ||
72a5e6bb AA |
550 | switch (lowpan_priv(dev)->lltype) { |
551 | case LOWPAN_LLTYPE_IEEE802154: | |
552 | if (lowpan_802154_cb(skb)->d_size) | |
553 | hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size - | |
554 | sizeof(struct ipv6hdr)); | |
555 | else | |
556 | hdr.payload_len = htons(skb->len); | |
557 | break; | |
558 | default: | |
559 | hdr.payload_len = htons(skb->len); | |
560 | break; | |
561 | } | |
8df8c56a JR |
562 | |
563 | pr_debug("skb headroom size = %d, data length = %d\n", | |
564 | skb_headroom(skb), skb->len); | |
565 | ||
566 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
567 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
568 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
569 | hdr.hop_limit, &hdr.daddr); | |
570 | ||
f8b36176 MT |
571 | skb_push(skb, sizeof(hdr)); |
572 | skb_reset_network_header(skb); | |
573 | skb_copy_to_linear_data(skb, &hdr, sizeof(hdr)); | |
8df8c56a | 574 | |
f8b36176 | 575 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr)); |
8df8c56a | 576 | |
f8b36176 | 577 | return 0; |
8df8c56a | 578 | } |
01141234 | 579 | EXPORT_SYMBOL_GPL(lowpan_header_decompress); |
8df8c56a | 580 | |
c8a3e7eb AA |
581 | static const u8 lowpan_iphc_dam_to_sam_value[] = { |
582 | [LOWPAN_IPHC_DAM_00] = LOWPAN_IPHC_SAM_00, | |
583 | [LOWPAN_IPHC_DAM_01] = LOWPAN_IPHC_SAM_01, | |
584 | [LOWPAN_IPHC_DAM_10] = LOWPAN_IPHC_SAM_10, | |
585 | [LOWPAN_IPHC_DAM_11] = LOWPAN_IPHC_SAM_11, | |
586 | }; | |
587 | ||
588 | static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct in6_addr *ipaddr, | |
589 | const unsigned char *lladdr, bool sam) | |
8df8c56a | 590 | { |
c8a3e7eb | 591 | u8 dam = LOWPAN_IPHC_DAM_00; |
8df8c56a JR |
592 | |
593 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
c8a3e7eb | 594 | dam = LOWPAN_IPHC_DAM_11; /* 0-bits */ |
8df8c56a JR |
595 | pr_debug("address compression 0 bits\n"); |
596 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
597 | /* compress IID to 16 bits xxxx::XXXX */ | |
85c71240 | 598 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2); |
c8a3e7eb | 599 | dam = LOWPAN_IPHC_DAM_10; /* 16-bits */ |
8df8c56a | 600 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", |
84ca5e03 | 601 | *hc_ptr - 2, 2); |
8df8c56a JR |
602 | } else { |
603 | /* do not compress IID => xxxx::IID */ | |
85c71240 | 604 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8); |
c8a3e7eb | 605 | dam = LOWPAN_IPHC_DAM_01; /* 64-bits */ |
8df8c56a | 606 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", |
84ca5e03 | 607 | *hc_ptr - 8, 8); |
8df8c56a JR |
608 | } |
609 | ||
c8a3e7eb AA |
610 | if (sam) |
611 | return lowpan_iphc_dam_to_sam_value[dam]; | |
612 | else | |
613 | return dam; | |
8df8c56a JR |
614 | } |
615 | ||
b5af9bdb AA |
616 | /* lowpan_iphc_get_tc - get the ECN + DCSP fields in hc format */ |
617 | static inline u8 lowpan_iphc_get_tc(const struct ipv6hdr *hdr) | |
618 | { | |
619 | u8 dscp, ecn; | |
620 | ||
621 | /* hdr->priority contains the higher bits of dscp, lower are part of | |
622 | * flow_lbl[0]. Note ECN, DCSP is swapped in ipv6 hdr. | |
623 | */ | |
624 | dscp = (hdr->priority << 2) | ((hdr->flow_lbl[0] & 0xc0) >> 6); | |
625 | /* ECN is at the two lower bits from first nibble of flow_lbl[0] */ | |
626 | ecn = (hdr->flow_lbl[0] & 0x30); | |
627 | /* for pretty debug output, also shift ecn to get the ecn value */ | |
628 | pr_debug("ecn 0x%02x dscp 0x%02x\n", ecn >> 4, dscp); | |
629 | /* ECN is at 0x30 now, shift it to have ECN + DCSP */ | |
630 | return (ecn << 2) | dscp; | |
631 | } | |
632 | ||
633 | /* lowpan_iphc_is_flow_lbl_zero - check if flow label is zero */ | |
634 | static inline bool lowpan_iphc_is_flow_lbl_zero(const struct ipv6hdr *hdr) | |
635 | { | |
636 | return ((!(hdr->flow_lbl[0] & 0x0f)) && | |
637 | !hdr->flow_lbl[1] && !hdr->flow_lbl[2]); | |
638 | } | |
639 | ||
640 | /* lowpan_iphc_tf_compress - compress the traffic class which is set by | |
641 | * ipv6hdr. Return the corresponding format identifier which is used. | |
642 | */ | |
643 | static u8 lowpan_iphc_tf_compress(u8 **hc_ptr, const struct ipv6hdr *hdr) | |
644 | { | |
645 | /* get ecn dscp data in a byteformat as: ECN(hi) + DSCP(lo) */ | |
646 | u8 tc = lowpan_iphc_get_tc(hdr), tf[4], val; | |
647 | ||
648 | /* printout the traffic class in hc format */ | |
649 | pr_debug("tc 0x%02x\n", tc); | |
650 | ||
651 | if (lowpan_iphc_is_flow_lbl_zero(hdr)) { | |
652 | if (!tc) { | |
653 | /* 11: Traffic Class and Flow Label are elided. */ | |
654 | val = LOWPAN_IPHC_TF_11; | |
655 | } else { | |
656 | /* 10: ECN + DSCP (1 byte), Flow Label is elided. | |
657 | * | |
658 | * 0 1 2 3 4 5 6 7 | |
659 | * +-+-+-+-+-+-+-+-+ | |
660 | * |ECN| DSCP | | |
661 | * +-+-+-+-+-+-+-+-+ | |
662 | */ | |
663 | lowpan_push_hc_data(hc_ptr, &tc, sizeof(tc)); | |
664 | val = LOWPAN_IPHC_TF_10; | |
665 | } | |
666 | } else { | |
667 | /* check if dscp is zero, it's after the first two bit */ | |
668 | if (!(tc & 0x3f)) { | |
669 | /* 01: ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
670 | * | |
671 | * 1 2 | |
672 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 | |
673 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
674 | * |ECN|rsv| Flow Label | | |
675 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
676 | */ | |
677 | memcpy(&tf[0], &hdr->flow_lbl[0], 3); | |
678 | /* zero the highest 4-bits, contains DCSP + ECN */ | |
679 | tf[0] &= ~0xf0; | |
680 | /* set ECN */ | |
681 | tf[0] |= (tc & 0xc0); | |
682 | ||
683 | lowpan_push_hc_data(hc_ptr, tf, 3); | |
684 | val = LOWPAN_IPHC_TF_01; | |
685 | } else { | |
686 | /* 00: ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
687 | * | |
688 | * 1 2 3 | |
689 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
690 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
691 | * |ECN| DSCP | rsv | Flow Label | | |
692 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
693 | */ | |
694 | memcpy(&tf[0], &tc, sizeof(tc)); | |
695 | /* highest nibble of flow_lbl[0] is part of DSCP + ECN | |
696 | * which will be the 4-bit pad and will be filled with | |
697 | * zeros afterwards. | |
698 | */ | |
699 | memcpy(&tf[1], &hdr->flow_lbl[0], 3); | |
700 | /* zero the 4-bit pad, which is reserved */ | |
701 | tf[1] &= ~0xf0; | |
702 | ||
703 | lowpan_push_hc_data(hc_ptr, tf, 4); | |
704 | val = LOWPAN_IPHC_TF_00; | |
705 | } | |
706 | } | |
707 | ||
708 | return val; | |
709 | } | |
710 | ||
a6f77389 AA |
711 | int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, |
712 | const void *daddr, const void *saddr) | |
8df8c56a | 713 | { |
b5af9bdb | 714 | u8 iphc0, iphc1, *hc_ptr; |
8df8c56a | 715 | struct ipv6hdr *hdr; |
bf513fd6 | 716 | u8 head[LOWPAN_IPHC_MAX_HC_BUF_LEN] = {}; |
cc6ed268 | 717 | int ret, addr_type; |
8df8c56a | 718 | |
a6f77389 | 719 | if (skb->protocol != htons(ETH_P_IPV6)) |
8df8c56a JR |
720 | return -EINVAL; |
721 | ||
722 | hdr = ipv6_hdr(skb); | |
84ca5e03 | 723 | hc_ptr = head + 2; |
8df8c56a JR |
724 | |
725 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
726 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
4710d806 VB |
727 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
728 | hdr->hop_limit, &hdr->daddr); | |
8df8c56a JR |
729 | |
730 | raw_dump_table(__func__, "raw skb network header dump", | |
4710d806 | 731 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
8df8c56a | 732 | |
4710d806 | 733 | /* As we copy some bit-length fields, in the IPHC encoding bytes, |
8df8c56a JR |
734 | * we sometimes use |= |
735 | * If the field is 0, and the current bit value in memory is 1, | |
736 | * this does not work. We therefore reset the IPHC encoding here | |
737 | */ | |
738 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
739 | iphc1 = 0; | |
740 | ||
741 | /* TODO: context lookup */ | |
742 | ||
a6f77389 AA |
743 | raw_dump_inline(__func__, "saddr", saddr, EUI64_ADDR_LEN); |
744 | raw_dump_inline(__func__, "daddr", daddr, EUI64_ADDR_LEN); | |
8df8c56a | 745 | |
7fc4cfda | 746 | raw_dump_table(__func__, "sending raw skb network uncompressed packet", |
4710d806 | 747 | skb->data, skb->len); |
8df8c56a | 748 | |
b5af9bdb AA |
749 | /* Traffic Class, Flow Label compression */ |
750 | iphc0 |= lowpan_iphc_tf_compress(&hc_ptr, hdr); | |
8df8c56a JR |
751 | |
752 | /* NOTE: payload length is always compressed */ | |
753 | ||
cc6ed268 AA |
754 | /* Check if we provide the nhc format for nexthdr and compression |
755 | * functionality. If not nexthdr is handled inline and not compressed. | |
756 | */ | |
607b0bd3 AA |
757 | ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr); |
758 | if (ret == -ENOENT) | |
759 | lowpan_push_hc_data(&hc_ptr, &hdr->nexthdr, | |
760 | sizeof(hdr->nexthdr)); | |
761 | else | |
c8a3e7eb | 762 | iphc0 |= LOWPAN_IPHC_NH; |
8df8c56a | 763 | |
4710d806 | 764 | /* Hop limit |
8df8c56a JR |
765 | * if 1: compress, encoding is 01 |
766 | * if 64: compress, encoding is 10 | |
767 | * if 255: compress, encoding is 11 | |
768 | * else do not compress | |
769 | */ | |
770 | switch (hdr->hop_limit) { | |
771 | case 1: | |
c8a3e7eb | 772 | iphc0 |= LOWPAN_IPHC_HLIM_01; |
8df8c56a JR |
773 | break; |
774 | case 64: | |
c8a3e7eb | 775 | iphc0 |= LOWPAN_IPHC_HLIM_10; |
8df8c56a JR |
776 | break; |
777 | case 255: | |
c8a3e7eb | 778 | iphc0 |= LOWPAN_IPHC_HLIM_11; |
8df8c56a JR |
779 | break; |
780 | default: | |
85c71240 AA |
781 | lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit, |
782 | sizeof(hdr->hop_limit)); | |
8df8c56a JR |
783 | } |
784 | ||
556a5bfc | 785 | addr_type = ipv6_addr_type(&hdr->saddr); |
8df8c56a | 786 | /* source address compression */ |
556a5bfc | 787 | if (addr_type == IPV6_ADDR_ANY) { |
8df8c56a JR |
788 | pr_debug("source address is unspecified, setting SAC\n"); |
789 | iphc1 |= LOWPAN_IPHC_SAC; | |
8df8c56a | 790 | } else { |
556a5bfc | 791 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
c8a3e7eb AA |
792 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, &hdr->saddr, |
793 | saddr, true); | |
556a5bfc AA |
794 | pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n", |
795 | &hdr->saddr, iphc1); | |
796 | } else { | |
797 | pr_debug("send the full source address\n"); | |
798 | lowpan_push_hc_data(&hc_ptr, hdr->saddr.s6_addr, 16); | |
799 | } | |
8df8c56a JR |
800 | } |
801 | ||
556a5bfc | 802 | addr_type = ipv6_addr_type(&hdr->daddr); |
8df8c56a | 803 | /* destination address compression */ |
556a5bfc | 804 | if (addr_type & IPV6_ADDR_MULTICAST) { |
8df8c56a JR |
805 | pr_debug("destination address is multicast: "); |
806 | iphc1 |= LOWPAN_IPHC_M; | |
807 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
808 | pr_debug("compressed to 1 octet\n"); | |
809 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
810 | /* use last byte */ | |
85c71240 AA |
811 | lowpan_push_hc_data(&hc_ptr, |
812 | &hdr->daddr.s6_addr[15], 1); | |
8df8c56a JR |
813 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { |
814 | pr_debug("compressed to 4 octets\n"); | |
815 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
816 | /* second byte + the last three */ | |
85c71240 AA |
817 | lowpan_push_hc_data(&hc_ptr, |
818 | &hdr->daddr.s6_addr[1], 1); | |
819 | lowpan_push_hc_data(&hc_ptr, | |
820 | &hdr->daddr.s6_addr[13], 3); | |
8df8c56a JR |
821 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { |
822 | pr_debug("compressed to 6 octets\n"); | |
823 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
824 | /* second byte + the last five */ | |
85c71240 AA |
825 | lowpan_push_hc_data(&hc_ptr, |
826 | &hdr->daddr.s6_addr[1], 1); | |
827 | lowpan_push_hc_data(&hc_ptr, | |
828 | &hdr->daddr.s6_addr[11], 5); | |
8df8c56a JR |
829 | } else { |
830 | pr_debug("using full address\n"); | |
831 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
85c71240 | 832 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
833 | } |
834 | } else { | |
556a5bfc AA |
835 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
836 | /* TODO: context lookup */ | |
c8a3e7eb AA |
837 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, &hdr->daddr, |
838 | daddr, false); | |
8df8c56a | 839 | pr_debug("dest address unicast link-local %pI6c " |
7fc4cfda | 840 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); |
8df8c56a JR |
841 | } else { |
842 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
85c71240 | 843 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
844 | } |
845 | } | |
846 | ||
cc6ed268 | 847 | /* next header compression */ |
c8a3e7eb | 848 | if (iphc0 & LOWPAN_IPHC_NH) { |
cc6ed268 AA |
849 | ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr); |
850 | if (ret < 0) | |
851 | return ret; | |
852 | } | |
8df8c56a JR |
853 | |
854 | head[0] = iphc0; | |
855 | head[1] = iphc1; | |
856 | ||
857 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
858 | skb_reset_transport_header(skb); | |
84ca5e03 | 859 | memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); |
8df8c56a JR |
860 | skb_reset_network_header(skb); |
861 | ||
84ca5e03 | 862 | pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); |
8df8c56a JR |
863 | |
864 | raw_dump_table(__func__, "raw skb data dump compressed", | |
4710d806 | 865 | skb->data, skb->len); |
8df8c56a JR |
866 | return 0; |
867 | } | |
868 | EXPORT_SYMBOL_GPL(lowpan_header_compress); |