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 | 55 | |
5609c185 | 56 | #include "6lowpan_i.h" |
cc6ed268 AA |
57 | #include "nhc.h" |
58 | ||
c8a3e7eb AA |
59 | /* Values of fields within the IPHC encoding first byte */ |
60 | #define LOWPAN_IPHC_TF_MASK 0x18 | |
61 | #define LOWPAN_IPHC_TF_00 0x00 | |
62 | #define LOWPAN_IPHC_TF_01 0x08 | |
63 | #define LOWPAN_IPHC_TF_10 0x10 | |
64 | #define LOWPAN_IPHC_TF_11 0x18 | |
65 | ||
66 | #define LOWPAN_IPHC_NH 0x04 | |
6350047e | 67 | |
c8a3e7eb AA |
68 | #define LOWPAN_IPHC_HLIM_MASK 0x03 |
69 | #define LOWPAN_IPHC_HLIM_00 0x00 | |
70 | #define LOWPAN_IPHC_HLIM_01 0x01 | |
71 | #define LOWPAN_IPHC_HLIM_10 0x02 | |
72 | #define LOWPAN_IPHC_HLIM_11 0x03 | |
6350047e AA |
73 | |
74 | /* Values of fields within the IPHC encoding second byte */ | |
75 | #define LOWPAN_IPHC_CID 0x80 | |
76 | ||
6350047e | 77 | #define LOWPAN_IPHC_SAC 0x40 |
6350047e | 78 | |
c8a3e7eb AA |
79 | #define LOWPAN_IPHC_SAM_MASK 0x30 |
80 | #define LOWPAN_IPHC_SAM_00 0x00 | |
81 | #define LOWPAN_IPHC_SAM_01 0x10 | |
82 | #define LOWPAN_IPHC_SAM_10 0x20 | |
83 | #define LOWPAN_IPHC_SAM_11 0x30 | |
6350047e AA |
84 | |
85 | #define LOWPAN_IPHC_M 0x08 | |
c8a3e7eb | 86 | |
6350047e | 87 | #define LOWPAN_IPHC_DAC 0x04 |
c8a3e7eb AA |
88 | |
89 | #define LOWPAN_IPHC_DAM_MASK 0x03 | |
6350047e AA |
90 | #define LOWPAN_IPHC_DAM_00 0x00 |
91 | #define LOWPAN_IPHC_DAM_01 0x01 | |
92 | #define LOWPAN_IPHC_DAM_10 0x02 | |
93 | #define LOWPAN_IPHC_DAM_11 0x03 | |
94 | ||
6350047e AA |
95 | /* ipv6 address based on mac |
96 | * second bit-flip (Universe/Local) is done according RFC2464 | |
97 | */ | |
98 | #define is_addr_mac_addr_based(a, m) \ | |
99 | ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \ | |
100 | (((a)->s6_addr[9]) == (m)[1]) && \ | |
101 | (((a)->s6_addr[10]) == (m)[2]) && \ | |
102 | (((a)->s6_addr[11]) == (m)[3]) && \ | |
103 | (((a)->s6_addr[12]) == (m)[4]) && \ | |
104 | (((a)->s6_addr[13]) == (m)[5]) && \ | |
105 | (((a)->s6_addr[14]) == (m)[6]) && \ | |
106 | (((a)->s6_addr[15]) == (m)[7])) | |
107 | ||
108 | /* check whether we can compress the IID to 16 bits, | |
109 | * it's possible for unicast addresses with first 49 bits are zero only. | |
110 | */ | |
111 | #define lowpan_is_iid_16_bit_compressable(a) \ | |
112 | ((((a)->s6_addr16[4]) == 0) && \ | |
113 | (((a)->s6_addr[10]) == 0) && \ | |
114 | (((a)->s6_addr[11]) == 0xff) && \ | |
115 | (((a)->s6_addr[12]) == 0xfe) && \ | |
116 | (((a)->s6_addr[13]) == 0)) | |
117 | ||
118 | /* check whether the 112-bit gid of the multicast address is mappable to: */ | |
119 | ||
120 | /* 48 bits, FFXX::00XX:XXXX:XXXX */ | |
121 | #define lowpan_is_mcast_addr_compressable48(a) \ | |
122 | ((((a)->s6_addr16[1]) == 0) && \ | |
123 | (((a)->s6_addr16[2]) == 0) && \ | |
124 | (((a)->s6_addr16[3]) == 0) && \ | |
125 | (((a)->s6_addr16[4]) == 0) && \ | |
126 | (((a)->s6_addr[10]) == 0)) | |
127 | ||
128 | /* 32 bits, FFXX::00XX:XXXX */ | |
129 | #define lowpan_is_mcast_addr_compressable32(a) \ | |
130 | ((((a)->s6_addr16[1]) == 0) && \ | |
131 | (((a)->s6_addr16[2]) == 0) && \ | |
132 | (((a)->s6_addr16[3]) == 0) && \ | |
133 | (((a)->s6_addr16[4]) == 0) && \ | |
134 | (((a)->s6_addr16[5]) == 0) && \ | |
135 | (((a)->s6_addr[12]) == 0)) | |
136 | ||
137 | /* 8 bits, FF02::00XX */ | |
138 | #define lowpan_is_mcast_addr_compressable8(a) \ | |
139 | ((((a)->s6_addr[1]) == 2) && \ | |
140 | (((a)->s6_addr16[1]) == 0) && \ | |
141 | (((a)->s6_addr16[2]) == 0) && \ | |
142 | (((a)->s6_addr16[3]) == 0) && \ | |
143 | (((a)->s6_addr16[4]) == 0) && \ | |
144 | (((a)->s6_addr16[5]) == 0) && \ | |
145 | (((a)->s6_addr16[6]) == 0) && \ | |
146 | (((a)->s6_addr[14]) == 0)) | |
147 | ||
feb2add3 AA |
148 | #define lowpan_is_linklocal_zero_padded(a) \ |
149 | (!(hdr->saddr.s6_addr[1] & 0x3f) && \ | |
150 | !hdr->saddr.s6_addr16[1] && \ | |
151 | !hdr->saddr.s6_addr32[1]) | |
152 | ||
5609c185 AA |
153 | #define LOWPAN_IPHC_CID_DCI(cid) (cid & 0x0f) |
154 | #define LOWPAN_IPHC_CID_SCI(cid) ((cid & 0xf0) >> 4) | |
155 | ||
7115a968 AA |
156 | static inline void |
157 | lowpan_iphc_uncompress_802154_lladdr(struct in6_addr *ipaddr, | |
158 | const void *lladdr) | |
8911d774 AA |
159 | { |
160 | const struct ieee802154_addr *addr = lladdr; | |
2bc068c3 | 161 | u8 eui64[EUI64_ADDR_LEN]; |
8911d774 AA |
162 | |
163 | switch (addr->mode) { | |
164 | case IEEE802154_ADDR_LONG: | |
165 | ieee802154_le64_to_be64(eui64, &addr->extended_addr); | |
7115a968 | 166 | lowpan_iphc_uncompress_eui64_lladdr(ipaddr, eui64); |
8911d774 AA |
167 | break; |
168 | case IEEE802154_ADDR_SHORT: | |
169 | /* fe:80::ff:fe00:XXXX | |
170 | * \__/ | |
171 | * short_addr | |
172 | * | |
173 | * Universe/Local bit is zero. | |
174 | */ | |
175 | ipaddr->s6_addr[0] = 0xFE; | |
176 | ipaddr->s6_addr[1] = 0x80; | |
177 | ipaddr->s6_addr[11] = 0xFF; | |
178 | ipaddr->s6_addr[12] = 0xFE; | |
179 | ieee802154_le16_to_be16(&ipaddr->s6_addr16[7], | |
180 | &addr->short_addr); | |
181 | break; | |
182 | default: | |
183 | /* should never handled and filtered by 802154 6lowpan */ | |
184 | WARN_ON_ONCE(1); | |
185 | break; | |
186 | } | |
187 | } | |
188 | ||
5609c185 AA |
189 | static struct lowpan_iphc_ctx * |
190 | lowpan_iphc_ctx_get_by_id(const struct net_device *dev, u8 id) | |
191 | { | |
2e4d60cb | 192 | struct lowpan_iphc_ctx *ret = &lowpan_dev(dev)->ctx.table[id]; |
5609c185 AA |
193 | |
194 | if (!lowpan_iphc_ctx_is_active(ret)) | |
195 | return NULL; | |
196 | ||
197 | return ret; | |
198 | } | |
199 | ||
200 | static struct lowpan_iphc_ctx * | |
201 | lowpan_iphc_ctx_get_by_addr(const struct net_device *dev, | |
202 | const struct in6_addr *addr) | |
203 | { | |
2e4d60cb | 204 | struct lowpan_iphc_ctx *table = lowpan_dev(dev)->ctx.table; |
5609c185 AA |
205 | struct lowpan_iphc_ctx *ret = NULL; |
206 | struct in6_addr addr_pfx; | |
207 | u8 addr_plen; | |
208 | int i; | |
209 | ||
210 | for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) { | |
211 | /* Check if context is valid. A context that is not valid | |
212 | * MUST NOT be used for compression. | |
213 | */ | |
214 | if (!lowpan_iphc_ctx_is_active(&table[i]) || | |
215 | !lowpan_iphc_ctx_is_compression(&table[i])) | |
216 | continue; | |
217 | ||
218 | ipv6_addr_prefix(&addr_pfx, addr, table[i].plen); | |
219 | ||
220 | /* if prefix len < 64, the remaining bits until 64th bit is | |
221 | * zero. Otherwise we use table[i]->plen. | |
222 | */ | |
223 | if (table[i].plen < 64) | |
224 | addr_plen = 64; | |
225 | else | |
226 | addr_plen = table[i].plen; | |
227 | ||
228 | if (ipv6_prefix_equal(&addr_pfx, &table[i].pfx, addr_plen)) { | |
229 | /* remember first match */ | |
230 | if (!ret) { | |
231 | ret = &table[i]; | |
232 | continue; | |
233 | } | |
234 | ||
235 | /* get the context with longest prefix len */ | |
236 | if (table[i].plen > ret->plen) | |
237 | ret = &table[i]; | |
238 | } | |
239 | } | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static struct lowpan_iphc_ctx * | |
245 | lowpan_iphc_ctx_get_by_mcast_addr(const struct net_device *dev, | |
246 | const struct in6_addr *addr) | |
247 | { | |
2e4d60cb | 248 | struct lowpan_iphc_ctx *table = lowpan_dev(dev)->ctx.table; |
5609c185 AA |
249 | struct lowpan_iphc_ctx *ret = NULL; |
250 | struct in6_addr addr_mcast, network_pfx = {}; | |
251 | int i; | |
252 | ||
253 | /* init mcast address with */ | |
254 | memcpy(&addr_mcast, addr, sizeof(*addr)); | |
255 | ||
256 | for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) { | |
257 | /* Check if context is valid. A context that is not valid | |
258 | * MUST NOT be used for compression. | |
259 | */ | |
260 | if (!lowpan_iphc_ctx_is_active(&table[i]) || | |
261 | !lowpan_iphc_ctx_is_compression(&table[i])) | |
262 | continue; | |
263 | ||
264 | /* setting plen */ | |
265 | addr_mcast.s6_addr[3] = table[i].plen; | |
266 | /* get network prefix to copy into multicast address */ | |
267 | ipv6_addr_prefix(&network_pfx, &table[i].pfx, | |
268 | table[i].plen); | |
269 | /* setting network prefix */ | |
270 | memcpy(&addr_mcast.s6_addr[4], &network_pfx, 8); | |
271 | ||
272 | if (ipv6_addr_equal(addr, &addr_mcast)) { | |
273 | ret = &table[i]; | |
274 | break; | |
275 | } | |
276 | } | |
277 | ||
278 | return ret; | |
279 | } | |
280 | ||
4710d806 | 281 | /* Uncompress address function for source and |
8df8c56a JR |
282 | * destination address(non-multicast). |
283 | * | |
c8a3e7eb | 284 | * address_mode is the masked value for sam or dam value |
8df8c56a | 285 | */ |
7115a968 AA |
286 | static int lowpan_iphc_uncompress_addr(struct sk_buff *skb, |
287 | const struct net_device *dev, | |
288 | struct in6_addr *ipaddr, | |
289 | u8 address_mode, const void *lladdr) | |
8df8c56a JR |
290 | { |
291 | bool fail; | |
292 | ||
293 | switch (address_mode) { | |
c8a3e7eb AA |
294 | /* SAM and DAM are the same here */ |
295 | case LOWPAN_IPHC_DAM_00: | |
8df8c56a JR |
296 | /* for global link addresses */ |
297 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
298 | break; | |
c8a3e7eb AA |
299 | case LOWPAN_IPHC_SAM_01: |
300 | case LOWPAN_IPHC_DAM_01: | |
8df8c56a JR |
301 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ |
302 | ipaddr->s6_addr[0] = 0xFE; | |
303 | ipaddr->s6_addr[1] = 0x80; | |
304 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
305 | break; | |
c8a3e7eb AA |
306 | case LOWPAN_IPHC_SAM_10: |
307 | case LOWPAN_IPHC_DAM_10: | |
8df8c56a JR |
308 | /* fe:80::ff:fe00:XXXX */ |
309 | ipaddr->s6_addr[0] = 0xFE; | |
310 | ipaddr->s6_addr[1] = 0x80; | |
311 | ipaddr->s6_addr[11] = 0xFF; | |
312 | ipaddr->s6_addr[12] = 0xFE; | |
313 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
314 | break; | |
c8a3e7eb AA |
315 | case LOWPAN_IPHC_SAM_11: |
316 | case LOWPAN_IPHC_DAM_11: | |
8df8c56a | 317 | fail = false; |
2e4d60cb | 318 | switch (lowpan_dev(dev)->lltype) { |
8911d774 | 319 | case LOWPAN_LLTYPE_IEEE802154: |
7115a968 | 320 | lowpan_iphc_uncompress_802154_lladdr(ipaddr, lladdr); |
8df8c56a JR |
321 | break; |
322 | default: | |
7115a968 | 323 | lowpan_iphc_uncompress_eui64_lladdr(ipaddr, lladdr); |
8911d774 | 324 | break; |
8df8c56a JR |
325 | } |
326 | break; | |
327 | default: | |
328 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | if (fail) { | |
333 | pr_debug("Failed to fetch skb data\n"); | |
334 | return -EIO; | |
335 | } | |
336 | ||
337 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
338 | ipaddr->s6_addr, 16); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
4710d806 | 343 | /* Uncompress address function for source context |
8df8c56a JR |
344 | * based address(non-multicast). |
345 | */ | |
7115a968 AA |
346 | static int lowpan_iphc_uncompress_ctx_addr(struct sk_buff *skb, |
347 | const struct net_device *dev, | |
348 | const struct lowpan_iphc_ctx *ctx, | |
349 | struct in6_addr *ipaddr, | |
350 | u8 address_mode, const void *lladdr) | |
8df8c56a | 351 | { |
5609c185 AA |
352 | bool fail; |
353 | ||
c8a3e7eb | 354 | switch (address_mode) { |
5609c185 AA |
355 | /* SAM and DAM are the same here */ |
356 | case LOWPAN_IPHC_DAM_00: | |
357 | fail = false; | |
358 | /* SAM_00 -> unspec address :: | |
8df8c56a | 359 | * Do nothing, address is already :: |
5609c185 AA |
360 | * |
361 | * DAM 00 -> reserved should never occur. | |
8df8c56a JR |
362 | */ |
363 | break; | |
c8a3e7eb | 364 | case LOWPAN_IPHC_SAM_01: |
5609c185 AA |
365 | case LOWPAN_IPHC_DAM_01: |
366 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
367 | ipv6_addr_prefix_copy(ipaddr, &ctx->pfx, ctx->plen); | |
368 | break; | |
c8a3e7eb | 369 | case LOWPAN_IPHC_SAM_10: |
5609c185 AA |
370 | case LOWPAN_IPHC_DAM_10: |
371 | ipaddr->s6_addr[11] = 0xFF; | |
372 | ipaddr->s6_addr[12] = 0xFE; | |
373 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
374 | ipv6_addr_prefix_copy(ipaddr, &ctx->pfx, ctx->plen); | |
375 | break; | |
c8a3e7eb | 376 | case LOWPAN_IPHC_SAM_11: |
5609c185 AA |
377 | case LOWPAN_IPHC_DAM_11: |
378 | fail = false; | |
2e4d60cb | 379 | switch (lowpan_dev(dev)->lltype) { |
5609c185 | 380 | case LOWPAN_LLTYPE_IEEE802154: |
7115a968 | 381 | lowpan_iphc_uncompress_802154_lladdr(ipaddr, lladdr); |
5609c185 AA |
382 | break; |
383 | default: | |
7115a968 | 384 | lowpan_iphc_uncompress_eui64_lladdr(ipaddr, lladdr); |
5609c185 AA |
385 | break; |
386 | } | |
387 | ipv6_addr_prefix_copy(ipaddr, &ctx->pfx, ctx->plen); | |
388 | break; | |
8df8c56a | 389 | default: |
c8a3e7eb | 390 | pr_debug("Invalid sam value: 0x%x\n", address_mode); |
8df8c56a JR |
391 | return -EINVAL; |
392 | } | |
393 | ||
5609c185 AA |
394 | if (fail) { |
395 | pr_debug("Failed to fetch skb data\n"); | |
396 | return -EIO; | |
397 | } | |
398 | ||
8df8c56a JR |
399 | raw_dump_inline(NULL, |
400 | "Reconstructed context based ipv6 src addr is", | |
401 | ipaddr->s6_addr, 16); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
8df8c56a JR |
406 | /* Uncompress function for multicast destination address, |
407 | * when M bit is set. | |
408 | */ | |
7fc4cfda MH |
409 | static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb, |
410 | struct in6_addr *ipaddr, | |
c8a3e7eb | 411 | u8 address_mode) |
8df8c56a JR |
412 | { |
413 | bool fail; | |
414 | ||
c8a3e7eb | 415 | switch (address_mode) { |
8df8c56a JR |
416 | case LOWPAN_IPHC_DAM_00: |
417 | /* 00: 128 bits. The full address | |
418 | * is carried in-line. | |
419 | */ | |
420 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
421 | break; | |
422 | case LOWPAN_IPHC_DAM_01: | |
423 | /* 01: 48 bits. The address takes | |
424 | * the form ffXX::00XX:XXXX:XXXX. | |
425 | */ | |
426 | ipaddr->s6_addr[0] = 0xFF; | |
427 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
428 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
429 | break; | |
430 | case LOWPAN_IPHC_DAM_10: | |
431 | /* 10: 32 bits. The address takes | |
432 | * the form ffXX::00XX:XXXX. | |
433 | */ | |
434 | ipaddr->s6_addr[0] = 0xFF; | |
435 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
436 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
437 | break; | |
438 | case LOWPAN_IPHC_DAM_11: | |
439 | /* 11: 8 bits. The address takes | |
440 | * the form ff02::00XX. | |
441 | */ | |
442 | ipaddr->s6_addr[0] = 0xFF; | |
443 | ipaddr->s6_addr[1] = 0x02; | |
444 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
445 | break; | |
446 | default: | |
c8a3e7eb | 447 | pr_debug("DAM value has a wrong value: 0x%x\n", address_mode); |
8df8c56a JR |
448 | return -EINVAL; |
449 | } | |
450 | ||
451 | if (fail) { | |
452 | pr_debug("Failed to fetch skb data\n"); | |
453 | return -EIO; | |
454 | } | |
455 | ||
456 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
7fc4cfda | 457 | ipaddr->s6_addr, 16); |
8df8c56a JR |
458 | |
459 | return 0; | |
460 | } | |
461 | ||
5609c185 AA |
462 | static int lowpan_uncompress_multicast_ctx_daddr(struct sk_buff *skb, |
463 | struct lowpan_iphc_ctx *ctx, | |
464 | struct in6_addr *ipaddr, | |
465 | u8 address_mode) | |
466 | { | |
467 | struct in6_addr network_pfx = {}; | |
468 | bool fail; | |
469 | ||
470 | ipaddr->s6_addr[0] = 0xFF; | |
471 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 2); | |
472 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[12], 4); | |
4c23d874 | 473 | if (fail) |
5609c185 AA |
474 | return -EIO; |
475 | ||
476 | /* take prefix_len and network prefix from the context */ | |
477 | ipaddr->s6_addr[3] = ctx->plen; | |
478 | /* get network prefix to copy into multicast address */ | |
479 | ipv6_addr_prefix(&network_pfx, &ctx->pfx, ctx->plen); | |
480 | /* setting network prefix */ | |
481 | memcpy(&ipaddr->s6_addr[4], &network_pfx, 8); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
b5af9bdb AA |
486 | /* get the ecn values from iphc tf format and set it to ipv6hdr */ |
487 | static inline void lowpan_iphc_tf_set_ecn(struct ipv6hdr *hdr, const u8 *tf) | |
488 | { | |
489 | /* get the two higher bits which is ecn */ | |
490 | u8 ecn = tf[0] & 0xc0; | |
491 | ||
492 | /* ECN takes 0x30 in hdr->flow_lbl[0] */ | |
493 | hdr->flow_lbl[0] |= (ecn >> 2); | |
494 | } | |
495 | ||
496 | /* get the dscp values from iphc tf format and set it to ipv6hdr */ | |
497 | static inline void lowpan_iphc_tf_set_dscp(struct ipv6hdr *hdr, const u8 *tf) | |
498 | { | |
499 | /* DSCP is at place after ECN */ | |
500 | u8 dscp = tf[0] & 0x3f; | |
501 | ||
502 | /* The four highest bits need to be set at hdr->priority */ | |
503 | hdr->priority |= ((dscp & 0x3c) >> 2); | |
504 | /* The two lower bits is part of hdr->flow_lbl[0] */ | |
505 | hdr->flow_lbl[0] |= ((dscp & 0x03) << 6); | |
506 | } | |
507 | ||
508 | /* get the flow label values from iphc tf format and set it to ipv6hdr */ | |
509 | static inline void lowpan_iphc_tf_set_lbl(struct ipv6hdr *hdr, const u8 *lbl) | |
510 | { | |
511 | /* flow label is always some array started with lower nibble of | |
512 | * flow_lbl[0] and followed with two bytes afterwards. Inside inline | |
513 | * data the flow_lbl position can be different, which will be handled | |
514 | * by lbl pointer. E.g. case "01" vs "00" the traffic class is 8 bit | |
515 | * shifted, the different lbl pointer will handle that. | |
516 | * | |
517 | * The flow label will started at lower nibble of flow_lbl[0], the | |
518 | * higher nibbles are part of DSCP + ECN. | |
519 | */ | |
520 | hdr->flow_lbl[0] |= lbl[0] & 0x0f; | |
521 | memcpy(&hdr->flow_lbl[1], &lbl[1], 2); | |
522 | } | |
523 | ||
524 | /* lowpan_iphc_tf_decompress - decompress the traffic class. | |
525 | * This function will return zero on success, a value lower than zero if | |
526 | * failed. | |
527 | */ | |
528 | static int lowpan_iphc_tf_decompress(struct sk_buff *skb, struct ipv6hdr *hdr, | |
529 | u8 val) | |
530 | { | |
531 | u8 tf[4]; | |
532 | ||
533 | /* Traffic Class and Flow Label */ | |
534 | switch (val) { | |
535 | case LOWPAN_IPHC_TF_00: | |
536 | /* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) */ | |
537 | if (lowpan_fetch_skb(skb, tf, 4)) | |
538 | return -EINVAL; | |
539 | ||
540 | /* 1 2 3 | |
541 | * 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 | |
542 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
543 | * |ECN| DSCP | rsv | Flow Label | | |
544 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
545 | */ | |
546 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
547 | lowpan_iphc_tf_set_dscp(hdr, tf); | |
548 | lowpan_iphc_tf_set_lbl(hdr, &tf[1]); | |
549 | break; | |
550 | case LOWPAN_IPHC_TF_01: | |
551 | /* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided. */ | |
552 | if (lowpan_fetch_skb(skb, tf, 3)) | |
553 | return -EINVAL; | |
554 | ||
555 | /* 1 2 | |
556 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 | |
557 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
558 | * |ECN|rsv| Flow Label | | |
559 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
560 | */ | |
561 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
562 | lowpan_iphc_tf_set_lbl(hdr, &tf[0]); | |
563 | break; | |
564 | case LOWPAN_IPHC_TF_10: | |
565 | /* ECN + DSCP (1 byte), Flow Label is elided. */ | |
566 | if (lowpan_fetch_skb(skb, tf, 1)) | |
567 | return -EINVAL; | |
568 | ||
569 | /* 0 1 2 3 4 5 6 7 | |
570 | * +-+-+-+-+-+-+-+-+ | |
571 | * |ECN| DSCP | | |
572 | * +-+-+-+-+-+-+-+-+ | |
573 | */ | |
574 | lowpan_iphc_tf_set_ecn(hdr, tf); | |
575 | lowpan_iphc_tf_set_dscp(hdr, tf); | |
576 | break; | |
577 | case LOWPAN_IPHC_TF_11: | |
578 | /* Traffic Class and Flow Label are elided */ | |
579 | break; | |
580 | default: | |
581 | WARN_ON_ONCE(1); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
8df8c56a | 588 | /* TTL uncompression values */ |
c8a3e7eb AA |
589 | static const u8 lowpan_ttl_values[] = { |
590 | [LOWPAN_IPHC_HLIM_01] = 1, | |
591 | [LOWPAN_IPHC_HLIM_10] = 64, | |
592 | [LOWPAN_IPHC_HLIM_11] = 255, | |
593 | }; | |
8df8c56a | 594 | |
8911d774 AA |
595 | int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, |
596 | const void *daddr, const void *saddr) | |
8df8c56a JR |
597 | { |
598 | struct ipv6hdr hdr = {}; | |
5609c185 AA |
599 | struct lowpan_iphc_ctx *ci; |
600 | u8 iphc0, iphc1, cid = 0; | |
8df8c56a JR |
601 | int err; |
602 | ||
603 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
4710d806 | 604 | skb->data, skb->len); |
8df8c56a | 605 | |
478208e3 AA |
606 | if (lowpan_fetch_skb(skb, &iphc0, sizeof(iphc0)) || |
607 | lowpan_fetch_skb(skb, &iphc1, sizeof(iphc1))) | |
8911d774 AA |
608 | return -EINVAL; |
609 | ||
8df8c56a JR |
610 | hdr.version = 6; |
611 | ||
5609c185 AA |
612 | /* default CID = 0, another if the CID flag is set */ |
613 | if (iphc1 & LOWPAN_IPHC_CID) { | |
614 | if (lowpan_fetch_skb(skb, &cid, sizeof(cid))) | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
b5af9bdb AA |
618 | err = lowpan_iphc_tf_decompress(skb, &hdr, |
619 | iphc0 & LOWPAN_IPHC_TF_MASK); | |
620 | if (err < 0) | |
621 | return err; | |
8df8c56a JR |
622 | |
623 | /* Next Header */ | |
c8a3e7eb | 624 | if (!(iphc0 & LOWPAN_IPHC_NH)) { |
8df8c56a | 625 | /* Next header is carried inline */ |
4ebc960f | 626 | if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) |
56b2c3ee | 627 | return -EINVAL; |
8df8c56a JR |
628 | |
629 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
630 | hdr.nexthdr); | |
631 | } | |
632 | ||
633 | /* Hop Limit */ | |
c8a3e7eb AA |
634 | if ((iphc0 & LOWPAN_IPHC_HLIM_MASK) != LOWPAN_IPHC_HLIM_00) { |
635 | hdr.hop_limit = lowpan_ttl_values[iphc0 & LOWPAN_IPHC_HLIM_MASK]; | |
4710d806 | 636 | } else { |
4ebc960f AA |
637 | if (lowpan_fetch_skb(skb, &hdr.hop_limit, |
638 | sizeof(hdr.hop_limit))) | |
56b2c3ee | 639 | return -EINVAL; |
8df8c56a JR |
640 | } |
641 | ||
8df8c56a | 642 | if (iphc1 & LOWPAN_IPHC_SAC) { |
2e4d60cb | 643 | spin_lock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
644 | ci = lowpan_iphc_ctx_get_by_id(dev, LOWPAN_IPHC_CID_SCI(cid)); |
645 | if (!ci) { | |
2e4d60cb | 646 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
647 | return -EINVAL; |
648 | } | |
649 | ||
8df8c56a | 650 | pr_debug("SAC bit is set. Handle context based source address.\n"); |
7115a968 AA |
651 | err = lowpan_iphc_uncompress_ctx_addr(skb, dev, ci, &hdr.saddr, |
652 | iphc1 & LOWPAN_IPHC_SAM_MASK, | |
653 | saddr); | |
2e4d60cb | 654 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
8df8c56a JR |
655 | } else { |
656 | /* Source address uncompression */ | |
657 | pr_debug("source address stateless compression\n"); | |
7115a968 AA |
658 | err = lowpan_iphc_uncompress_addr(skb, dev, &hdr.saddr, |
659 | iphc1 & LOWPAN_IPHC_SAM_MASK, | |
660 | saddr); | |
8df8c56a JR |
661 | } |
662 | ||
663 | /* Check on error of previous branch */ | |
664 | if (err) | |
56b2c3ee | 665 | return -EINVAL; |
8df8c56a | 666 | |
5609c185 AA |
667 | switch (iphc1 & (LOWPAN_IPHC_M | LOWPAN_IPHC_DAC)) { |
668 | case LOWPAN_IPHC_M | LOWPAN_IPHC_DAC: | |
2e4d60cb | 669 | spin_lock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
670 | ci = lowpan_iphc_ctx_get_by_id(dev, LOWPAN_IPHC_CID_DCI(cid)); |
671 | if (!ci) { | |
2e4d60cb | 672 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
673 | return -EINVAL; |
674 | } | |
7fc4cfda | 675 | |
5609c185 AA |
676 | /* multicast with context */ |
677 | pr_debug("dest: context-based mcast compression\n"); | |
678 | err = lowpan_uncompress_multicast_ctx_daddr(skb, ci, | |
679 | &hdr.daddr, | |
680 | iphc1 & LOWPAN_IPHC_DAM_MASK); | |
2e4d60cb | 681 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
682 | break; |
683 | case LOWPAN_IPHC_M: | |
684 | /* multicast */ | |
685 | err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr, | |
686 | iphc1 & LOWPAN_IPHC_DAM_MASK); | |
687 | break; | |
688 | case LOWPAN_IPHC_DAC: | |
2e4d60cb | 689 | spin_lock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
690 | ci = lowpan_iphc_ctx_get_by_id(dev, LOWPAN_IPHC_CID_DCI(cid)); |
691 | if (!ci) { | |
2e4d60cb | 692 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 | 693 | return -EINVAL; |
8df8c56a | 694 | } |
5609c185 AA |
695 | |
696 | /* Destination address context based uncompression */ | |
697 | pr_debug("DAC bit is set. Handle context based destination address.\n"); | |
7115a968 AA |
698 | err = lowpan_iphc_uncompress_ctx_addr(skb, dev, ci, &hdr.daddr, |
699 | iphc1 & LOWPAN_IPHC_DAM_MASK, | |
700 | daddr); | |
2e4d60cb | 701 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
702 | break; |
703 | default: | |
7115a968 AA |
704 | err = lowpan_iphc_uncompress_addr(skb, dev, &hdr.daddr, |
705 | iphc1 & LOWPAN_IPHC_DAM_MASK, | |
706 | daddr); | |
8df8c56a | 707 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", |
c8a3e7eb | 708 | iphc1 & LOWPAN_IPHC_DAM_MASK, &hdr.daddr); |
5609c185 | 709 | break; |
8df8c56a JR |
710 | } |
711 | ||
5609c185 AA |
712 | if (err) |
713 | return -EINVAL; | |
714 | ||
cc6ed268 | 715 | /* Next header data uncompression */ |
c8a3e7eb | 716 | if (iphc0 & LOWPAN_IPHC_NH) { |
cc6ed268 AA |
717 | err = lowpan_nhc_do_uncompression(skb, dev, &hdr); |
718 | if (err < 0) | |
11e3ff70 | 719 | return err; |
11e3ff70 MT |
720 | } else { |
721 | err = skb_cow(skb, sizeof(hdr)); | |
56b2c3ee | 722 | if (unlikely(err)) |
11e3ff70 | 723 | return err; |
8df8c56a JR |
724 | } |
725 | ||
2e4d60cb | 726 | switch (lowpan_dev(dev)->lltype) { |
72a5e6bb AA |
727 | case LOWPAN_LLTYPE_IEEE802154: |
728 | if (lowpan_802154_cb(skb)->d_size) | |
729 | hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size - | |
730 | sizeof(struct ipv6hdr)); | |
731 | else | |
732 | hdr.payload_len = htons(skb->len); | |
733 | break; | |
734 | default: | |
735 | hdr.payload_len = htons(skb->len); | |
736 | break; | |
737 | } | |
8df8c56a JR |
738 | |
739 | pr_debug("skb headroom size = %d, data length = %d\n", | |
740 | skb_headroom(skb), skb->len); | |
741 | ||
742 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
743 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
744 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
745 | hdr.hop_limit, &hdr.daddr); | |
746 | ||
f8b36176 MT |
747 | skb_push(skb, sizeof(hdr)); |
748 | skb_reset_network_header(skb); | |
749 | skb_copy_to_linear_data(skb, &hdr, sizeof(hdr)); | |
8df8c56a | 750 | |
f8b36176 | 751 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr)); |
8df8c56a | 752 | |
f8b36176 | 753 | return 0; |
8df8c56a | 754 | } |
01141234 | 755 | EXPORT_SYMBOL_GPL(lowpan_header_decompress); |
8df8c56a | 756 | |
c8a3e7eb AA |
757 | static const u8 lowpan_iphc_dam_to_sam_value[] = { |
758 | [LOWPAN_IPHC_DAM_00] = LOWPAN_IPHC_SAM_00, | |
759 | [LOWPAN_IPHC_DAM_01] = LOWPAN_IPHC_SAM_01, | |
760 | [LOWPAN_IPHC_DAM_10] = LOWPAN_IPHC_SAM_10, | |
761 | [LOWPAN_IPHC_DAM_11] = LOWPAN_IPHC_SAM_11, | |
762 | }; | |
763 | ||
5609c185 AA |
764 | static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct in6_addr *ipaddr, |
765 | const struct lowpan_iphc_ctx *ctx, | |
766 | const unsigned char *lladdr, bool sam) | |
767 | { | |
768 | struct in6_addr tmp = {}; | |
769 | u8 dam; | |
770 | ||
771 | /* check for SAM/DAM = 11 */ | |
772 | memcpy(&tmp.s6_addr[8], lladdr, 8); | |
773 | /* second bit-flip (Universe/Local) is done according RFC2464 */ | |
774 | tmp.s6_addr[8] ^= 0x02; | |
775 | /* context information are always used */ | |
776 | ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen); | |
777 | if (ipv6_addr_equal(&tmp, ipaddr)) { | |
778 | dam = LOWPAN_IPHC_DAM_11; | |
779 | goto out; | |
780 | } | |
781 | ||
782 | memset(&tmp, 0, sizeof(tmp)); | |
24c4a81d | 783 | /* check for SAM/DAM = 10 */ |
5609c185 AA |
784 | tmp.s6_addr[11] = 0xFF; |
785 | tmp.s6_addr[12] = 0xFE; | |
786 | memcpy(&tmp.s6_addr[14], &ipaddr->s6_addr[14], 2); | |
787 | /* context information are always used */ | |
788 | ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen); | |
789 | if (ipv6_addr_equal(&tmp, ipaddr)) { | |
790 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[14], 2); | |
791 | dam = LOWPAN_IPHC_DAM_10; | |
792 | goto out; | |
793 | } | |
794 | ||
795 | memset(&tmp, 0, sizeof(tmp)); | |
24c4a81d | 796 | /* check for SAM/DAM = 01, should always match */ |
5609c185 AA |
797 | memcpy(&tmp.s6_addr[8], &ipaddr->s6_addr[8], 8); |
798 | /* context information are always used */ | |
799 | ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen); | |
800 | if (ipv6_addr_equal(&tmp, ipaddr)) { | |
801 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[8], 8); | |
802 | dam = LOWPAN_IPHC_DAM_01; | |
803 | goto out; | |
804 | } | |
805 | ||
2306f656 AA |
806 | WARN_ONCE(1, "context found but no address mode matched\n"); |
807 | return LOWPAN_IPHC_DAM_00; | |
5609c185 AA |
808 | out: |
809 | ||
810 | if (sam) | |
811 | return lowpan_iphc_dam_to_sam_value[dam]; | |
812 | else | |
813 | return dam; | |
814 | } | |
815 | ||
c8a3e7eb AA |
816 | static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct in6_addr *ipaddr, |
817 | const unsigned char *lladdr, bool sam) | |
8df8c56a | 818 | { |
c8a3e7eb | 819 | u8 dam = LOWPAN_IPHC_DAM_00; |
8df8c56a JR |
820 | |
821 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
c8a3e7eb | 822 | dam = LOWPAN_IPHC_DAM_11; /* 0-bits */ |
8df8c56a JR |
823 | pr_debug("address compression 0 bits\n"); |
824 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
825 | /* compress IID to 16 bits xxxx::XXXX */ | |
85c71240 | 826 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2); |
c8a3e7eb | 827 | dam = LOWPAN_IPHC_DAM_10; /* 16-bits */ |
8df8c56a | 828 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", |
84ca5e03 | 829 | *hc_ptr - 2, 2); |
8df8c56a JR |
830 | } else { |
831 | /* do not compress IID => xxxx::IID */ | |
85c71240 | 832 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8); |
c8a3e7eb | 833 | dam = LOWPAN_IPHC_DAM_01; /* 64-bits */ |
8df8c56a | 834 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", |
84ca5e03 | 835 | *hc_ptr - 8, 8); |
8df8c56a JR |
836 | } |
837 | ||
c8a3e7eb AA |
838 | if (sam) |
839 | return lowpan_iphc_dam_to_sam_value[dam]; | |
840 | else | |
841 | return dam; | |
8df8c56a JR |
842 | } |
843 | ||
b5af9bdb AA |
844 | /* lowpan_iphc_get_tc - get the ECN + DCSP fields in hc format */ |
845 | static inline u8 lowpan_iphc_get_tc(const struct ipv6hdr *hdr) | |
846 | { | |
847 | u8 dscp, ecn; | |
848 | ||
849 | /* hdr->priority contains the higher bits of dscp, lower are part of | |
850 | * flow_lbl[0]. Note ECN, DCSP is swapped in ipv6 hdr. | |
851 | */ | |
852 | dscp = (hdr->priority << 2) | ((hdr->flow_lbl[0] & 0xc0) >> 6); | |
853 | /* ECN is at the two lower bits from first nibble of flow_lbl[0] */ | |
854 | ecn = (hdr->flow_lbl[0] & 0x30); | |
855 | /* for pretty debug output, also shift ecn to get the ecn value */ | |
856 | pr_debug("ecn 0x%02x dscp 0x%02x\n", ecn >> 4, dscp); | |
857 | /* ECN is at 0x30 now, shift it to have ECN + DCSP */ | |
858 | return (ecn << 2) | dscp; | |
859 | } | |
860 | ||
861 | /* lowpan_iphc_is_flow_lbl_zero - check if flow label is zero */ | |
862 | static inline bool lowpan_iphc_is_flow_lbl_zero(const struct ipv6hdr *hdr) | |
863 | { | |
864 | return ((!(hdr->flow_lbl[0] & 0x0f)) && | |
865 | !hdr->flow_lbl[1] && !hdr->flow_lbl[2]); | |
866 | } | |
867 | ||
868 | /* lowpan_iphc_tf_compress - compress the traffic class which is set by | |
869 | * ipv6hdr. Return the corresponding format identifier which is used. | |
870 | */ | |
871 | static u8 lowpan_iphc_tf_compress(u8 **hc_ptr, const struct ipv6hdr *hdr) | |
872 | { | |
873 | /* get ecn dscp data in a byteformat as: ECN(hi) + DSCP(lo) */ | |
874 | u8 tc = lowpan_iphc_get_tc(hdr), tf[4], val; | |
875 | ||
876 | /* printout the traffic class in hc format */ | |
877 | pr_debug("tc 0x%02x\n", tc); | |
878 | ||
879 | if (lowpan_iphc_is_flow_lbl_zero(hdr)) { | |
880 | if (!tc) { | |
881 | /* 11: Traffic Class and Flow Label are elided. */ | |
882 | val = LOWPAN_IPHC_TF_11; | |
883 | } else { | |
884 | /* 10: ECN + DSCP (1 byte), Flow Label is elided. | |
885 | * | |
886 | * 0 1 2 3 4 5 6 7 | |
887 | * +-+-+-+-+-+-+-+-+ | |
888 | * |ECN| DSCP | | |
889 | * +-+-+-+-+-+-+-+-+ | |
890 | */ | |
891 | lowpan_push_hc_data(hc_ptr, &tc, sizeof(tc)); | |
892 | val = LOWPAN_IPHC_TF_10; | |
893 | } | |
894 | } else { | |
895 | /* check if dscp is zero, it's after the first two bit */ | |
896 | if (!(tc & 0x3f)) { | |
897 | /* 01: ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
898 | * | |
899 | * 1 2 | |
900 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 | |
901 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
902 | * |ECN|rsv| Flow Label | | |
903 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
904 | */ | |
905 | memcpy(&tf[0], &hdr->flow_lbl[0], 3); | |
906 | /* zero the highest 4-bits, contains DCSP + ECN */ | |
907 | tf[0] &= ~0xf0; | |
908 | /* set ECN */ | |
909 | tf[0] |= (tc & 0xc0); | |
910 | ||
911 | lowpan_push_hc_data(hc_ptr, tf, 3); | |
912 | val = LOWPAN_IPHC_TF_01; | |
913 | } else { | |
914 | /* 00: ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
915 | * | |
916 | * 1 2 3 | |
917 | * 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 | |
918 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
919 | * |ECN| DSCP | rsv | Flow Label | | |
920 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
921 | */ | |
922 | memcpy(&tf[0], &tc, sizeof(tc)); | |
923 | /* highest nibble of flow_lbl[0] is part of DSCP + ECN | |
924 | * which will be the 4-bit pad and will be filled with | |
925 | * zeros afterwards. | |
926 | */ | |
927 | memcpy(&tf[1], &hdr->flow_lbl[0], 3); | |
928 | /* zero the 4-bit pad, which is reserved */ | |
929 | tf[1] &= ~0xf0; | |
930 | ||
931 | lowpan_push_hc_data(hc_ptr, tf, 4); | |
932 | val = LOWPAN_IPHC_TF_00; | |
933 | } | |
934 | } | |
935 | ||
936 | return val; | |
937 | } | |
938 | ||
5609c185 AA |
939 | static u8 lowpan_iphc_mcast_ctx_addr_compress(u8 **hc_ptr, |
940 | const struct lowpan_iphc_ctx *ctx, | |
941 | const struct in6_addr *ipaddr) | |
942 | { | |
943 | u8 data[6]; | |
944 | ||
945 | /* flags/scope, reserved (RIID) */ | |
946 | memcpy(data, &ipaddr->s6_addr[1], 2); | |
947 | /* group ID */ | |
948 | memcpy(&data[1], &ipaddr->s6_addr[11], 4); | |
949 | lowpan_push_hc_data(hc_ptr, data, 6); | |
950 | ||
951 | return LOWPAN_IPHC_DAM_00; | |
952 | } | |
953 | ||
09bf420f AA |
954 | static u8 lowpan_iphc_mcast_addr_compress(u8 **hc_ptr, |
955 | const struct in6_addr *ipaddr) | |
956 | { | |
957 | u8 val; | |
958 | ||
959 | if (lowpan_is_mcast_addr_compressable8(ipaddr)) { | |
960 | pr_debug("compressed to 1 octet\n"); | |
961 | /* use last byte */ | |
962 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[15], 1); | |
963 | val = LOWPAN_IPHC_DAM_11; | |
964 | } else if (lowpan_is_mcast_addr_compressable32(ipaddr)) { | |
965 | pr_debug("compressed to 4 octets\n"); | |
966 | /* second byte + the last three */ | |
967 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[1], 1); | |
968 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[13], 3); | |
969 | val = LOWPAN_IPHC_DAM_10; | |
970 | } else if (lowpan_is_mcast_addr_compressable48(ipaddr)) { | |
971 | pr_debug("compressed to 6 octets\n"); | |
972 | /* second byte + the last five */ | |
973 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[1], 1); | |
974 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[11], 5); | |
975 | val = LOWPAN_IPHC_DAM_01; | |
976 | } else { | |
977 | pr_debug("using full address\n"); | |
978 | lowpan_push_hc_data(hc_ptr, ipaddr->s6_addr, 16); | |
979 | val = LOWPAN_IPHC_DAM_00; | |
980 | } | |
981 | ||
982 | return val; | |
983 | } | |
984 | ||
a6f77389 AA |
985 | int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, |
986 | const void *daddr, const void *saddr) | |
8df8c56a | 987 | { |
5609c185 | 988 | u8 iphc0, iphc1, *hc_ptr, cid = 0; |
8df8c56a | 989 | struct ipv6hdr *hdr; |
bf513fd6 | 990 | u8 head[LOWPAN_IPHC_MAX_HC_BUF_LEN] = {}; |
5609c185 AA |
991 | struct lowpan_iphc_ctx *dci, *sci, dci_entry, sci_entry; |
992 | int ret, ipv6_daddr_type, ipv6_saddr_type; | |
8df8c56a | 993 | |
a6f77389 | 994 | if (skb->protocol != htons(ETH_P_IPV6)) |
8df8c56a JR |
995 | return -EINVAL; |
996 | ||
997 | hdr = ipv6_hdr(skb); | |
84ca5e03 | 998 | hc_ptr = head + 2; |
8df8c56a JR |
999 | |
1000 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
1001 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
4710d806 VB |
1002 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
1003 | hdr->hop_limit, &hdr->daddr); | |
8df8c56a JR |
1004 | |
1005 | raw_dump_table(__func__, "raw skb network header dump", | |
4710d806 | 1006 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
8df8c56a | 1007 | |
4710d806 | 1008 | /* As we copy some bit-length fields, in the IPHC encoding bytes, |
8df8c56a JR |
1009 | * we sometimes use |= |
1010 | * If the field is 0, and the current bit value in memory is 1, | |
1011 | * this does not work. We therefore reset the IPHC encoding here | |
1012 | */ | |
1013 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
1014 | iphc1 = 0; | |
1015 | ||
a6f77389 AA |
1016 | raw_dump_inline(__func__, "saddr", saddr, EUI64_ADDR_LEN); |
1017 | raw_dump_inline(__func__, "daddr", daddr, EUI64_ADDR_LEN); | |
8df8c56a | 1018 | |
7fc4cfda | 1019 | raw_dump_table(__func__, "sending raw skb network uncompressed packet", |
4710d806 | 1020 | skb->data, skb->len); |
8df8c56a | 1021 | |
5609c185 | 1022 | ipv6_daddr_type = ipv6_addr_type(&hdr->daddr); |
2e4d60cb | 1023 | spin_lock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
1024 | if (ipv6_daddr_type & IPV6_ADDR_MULTICAST) |
1025 | dci = lowpan_iphc_ctx_get_by_mcast_addr(dev, &hdr->daddr); | |
1026 | else | |
1027 | dci = lowpan_iphc_ctx_get_by_addr(dev, &hdr->daddr); | |
1028 | if (dci) { | |
1029 | memcpy(&dci_entry, dci, sizeof(*dci)); | |
1030 | cid |= dci->id; | |
1031 | } | |
2e4d60cb | 1032 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 | 1033 | |
2e4d60cb | 1034 | spin_lock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
1035 | sci = lowpan_iphc_ctx_get_by_addr(dev, &hdr->saddr); |
1036 | if (sci) { | |
1037 | memcpy(&sci_entry, sci, sizeof(*sci)); | |
1038 | cid |= (sci->id << 4); | |
1039 | } | |
2e4d60cb | 1040 | spin_unlock_bh(&lowpan_dev(dev)->ctx.lock); |
5609c185 AA |
1041 | |
1042 | /* if cid is zero it will be compressed */ | |
1043 | if (cid) { | |
1044 | iphc1 |= LOWPAN_IPHC_CID; | |
1045 | lowpan_push_hc_data(&hc_ptr, &cid, sizeof(cid)); | |
1046 | } | |
1047 | ||
b5af9bdb AA |
1048 | /* Traffic Class, Flow Label compression */ |
1049 | iphc0 |= lowpan_iphc_tf_compress(&hc_ptr, hdr); | |
8df8c56a JR |
1050 | |
1051 | /* NOTE: payload length is always compressed */ | |
1052 | ||
cc6ed268 AA |
1053 | /* Check if we provide the nhc format for nexthdr and compression |
1054 | * functionality. If not nexthdr is handled inline and not compressed. | |
1055 | */ | |
607b0bd3 AA |
1056 | ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr); |
1057 | if (ret == -ENOENT) | |
1058 | lowpan_push_hc_data(&hc_ptr, &hdr->nexthdr, | |
1059 | sizeof(hdr->nexthdr)); | |
1060 | else | |
c8a3e7eb | 1061 | iphc0 |= LOWPAN_IPHC_NH; |
8df8c56a | 1062 | |
4710d806 | 1063 | /* Hop limit |
8df8c56a JR |
1064 | * if 1: compress, encoding is 01 |
1065 | * if 64: compress, encoding is 10 | |
1066 | * if 255: compress, encoding is 11 | |
1067 | * else do not compress | |
1068 | */ | |
1069 | switch (hdr->hop_limit) { | |
1070 | case 1: | |
c8a3e7eb | 1071 | iphc0 |= LOWPAN_IPHC_HLIM_01; |
8df8c56a JR |
1072 | break; |
1073 | case 64: | |
c8a3e7eb | 1074 | iphc0 |= LOWPAN_IPHC_HLIM_10; |
8df8c56a JR |
1075 | break; |
1076 | case 255: | |
c8a3e7eb | 1077 | iphc0 |= LOWPAN_IPHC_HLIM_11; |
8df8c56a JR |
1078 | break; |
1079 | default: | |
85c71240 AA |
1080 | lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit, |
1081 | sizeof(hdr->hop_limit)); | |
8df8c56a JR |
1082 | } |
1083 | ||
5609c185 | 1084 | ipv6_saddr_type = ipv6_addr_type(&hdr->saddr); |
8df8c56a | 1085 | /* source address compression */ |
5609c185 | 1086 | if (ipv6_saddr_type == IPV6_ADDR_ANY) { |
8df8c56a JR |
1087 | pr_debug("source address is unspecified, setting SAC\n"); |
1088 | iphc1 |= LOWPAN_IPHC_SAC; | |
8df8c56a | 1089 | } else { |
5609c185 AA |
1090 | if (sci) { |
1091 | iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, &hdr->saddr, | |
1092 | &sci_entry, saddr, | |
1093 | true); | |
1094 | iphc1 |= LOWPAN_IPHC_SAC; | |
556a5bfc | 1095 | } else { |
feb2add3 AA |
1096 | if (ipv6_saddr_type & IPV6_ADDR_LINKLOCAL && |
1097 | lowpan_is_linklocal_zero_padded(hdr->saddr)) { | |
5609c185 AA |
1098 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
1099 | &hdr->saddr, | |
1100 | saddr, true); | |
1101 | pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n", | |
1102 | &hdr->saddr, iphc1); | |
1103 | } else { | |
1104 | pr_debug("send the full source address\n"); | |
1105 | lowpan_push_hc_data(&hc_ptr, | |
1106 | hdr->saddr.s6_addr, 16); | |
1107 | } | |
556a5bfc | 1108 | } |
8df8c56a JR |
1109 | } |
1110 | ||
1111 | /* destination address compression */ | |
5609c185 | 1112 | if (ipv6_daddr_type & IPV6_ADDR_MULTICAST) { |
8df8c56a | 1113 | pr_debug("destination address is multicast: "); |
8790404d | 1114 | iphc1 |= LOWPAN_IPHC_M; |
5609c185 AA |
1115 | if (dci) { |
1116 | iphc1 |= lowpan_iphc_mcast_ctx_addr_compress(&hc_ptr, | |
1117 | &dci_entry, | |
1118 | &hdr->daddr); | |
8790404d | 1119 | iphc1 |= LOWPAN_IPHC_DAC; |
5609c185 | 1120 | } else { |
5609c185 AA |
1121 | iphc1 |= lowpan_iphc_mcast_addr_compress(&hc_ptr, |
1122 | &hdr->daddr); | |
1123 | } | |
8df8c56a | 1124 | } else { |
5609c185 AA |
1125 | if (dci) { |
1126 | iphc1 |= lowpan_compress_ctx_addr(&hc_ptr, &hdr->daddr, | |
1127 | &dci_entry, daddr, | |
1128 | false); | |
1129 | iphc1 |= LOWPAN_IPHC_DAC; | |
8df8c56a | 1130 | } else { |
feb2add3 AA |
1131 | if (ipv6_daddr_type & IPV6_ADDR_LINKLOCAL && |
1132 | lowpan_is_linklocal_zero_padded(hdr->daddr)) { | |
5609c185 AA |
1133 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
1134 | &hdr->daddr, | |
1135 | daddr, false); | |
1136 | pr_debug("dest address unicast link-local %pI6c iphc1 0x%02x\n", | |
1137 | &hdr->daddr, iphc1); | |
1138 | } else { | |
1139 | pr_debug("dest address unicast %pI6c\n", | |
1140 | &hdr->daddr); | |
1141 | lowpan_push_hc_data(&hc_ptr, | |
1142 | hdr->daddr.s6_addr, 16); | |
1143 | } | |
8df8c56a JR |
1144 | } |
1145 | } | |
1146 | ||
cc6ed268 | 1147 | /* next header compression */ |
c8a3e7eb | 1148 | if (iphc0 & LOWPAN_IPHC_NH) { |
cc6ed268 AA |
1149 | ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr); |
1150 | if (ret < 0) | |
1151 | return ret; | |
1152 | } | |
8df8c56a JR |
1153 | |
1154 | head[0] = iphc0; | |
1155 | head[1] = iphc1; | |
1156 | ||
1157 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
1158 | skb_reset_transport_header(skb); | |
84ca5e03 | 1159 | memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); |
8df8c56a JR |
1160 | skb_reset_network_header(skb); |
1161 | ||
84ca5e03 | 1162 | pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); |
8df8c56a JR |
1163 | |
1164 | raw_dump_table(__func__, "raw skb data dump compressed", | |
4710d806 | 1165 | skb->data, skb->len); |
8df8c56a JR |
1166 | return 0; |
1167 | } | |
1168 | EXPORT_SYMBOL_GPL(lowpan_header_compress); |