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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> | |
cefc8c8a | 52 | #include <net/6lowpan.h> |
8df8c56a JR |
53 | #include <net/ipv6.h> |
54 | #include <net/af_ieee802154.h> | |
55 | ||
cc6ed268 AA |
56 | #include "nhc.h" |
57 | ||
4710d806 | 58 | /* Uncompress address function for source and |
8df8c56a JR |
59 | * destination address(non-multicast). |
60 | * | |
61 | * address_mode is sam value or dam value. | |
62 | */ | |
63 | static int uncompress_addr(struct sk_buff *skb, | |
4710d806 VB |
64 | struct in6_addr *ipaddr, const u8 address_mode, |
65 | const u8 *lladdr, const u8 addr_type, | |
66 | const u8 addr_len) | |
8df8c56a JR |
67 | { |
68 | bool fail; | |
69 | ||
70 | switch (address_mode) { | |
71 | case LOWPAN_IPHC_ADDR_00: | |
72 | /* for global link addresses */ | |
73 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
74 | break; | |
75 | case LOWPAN_IPHC_ADDR_01: | |
76 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ | |
77 | ipaddr->s6_addr[0] = 0xFE; | |
78 | ipaddr->s6_addr[1] = 0x80; | |
79 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
80 | break; | |
81 | case LOWPAN_IPHC_ADDR_02: | |
82 | /* fe:80::ff:fe00:XXXX */ | |
83 | ipaddr->s6_addr[0] = 0xFE; | |
84 | ipaddr->s6_addr[1] = 0x80; | |
85 | ipaddr->s6_addr[11] = 0xFF; | |
86 | ipaddr->s6_addr[12] = 0xFE; | |
87 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
88 | break; | |
89 | case LOWPAN_IPHC_ADDR_03: | |
90 | fail = false; | |
91 | switch (addr_type) { | |
92 | case IEEE802154_ADDR_LONG: | |
93 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
94 | * \_________________/ | |
95 | * hwaddr | |
96 | */ | |
97 | ipaddr->s6_addr[0] = 0xFE; | |
98 | ipaddr->s6_addr[1] = 0x80; | |
99 | memcpy(&ipaddr->s6_addr[8], lladdr, addr_len); | |
100 | /* second bit-flip (Universe/Local) | |
101 | * is done according RFC2464 | |
102 | */ | |
103 | ipaddr->s6_addr[8] ^= 0x02; | |
104 | break; | |
105 | case IEEE802154_ADDR_SHORT: | |
106 | /* fe:80::ff:fe00:XXXX | |
107 | * \__/ | |
108 | * short_addr | |
109 | * | |
110 | * Universe/Local bit is zero. | |
111 | */ | |
112 | ipaddr->s6_addr[0] = 0xFE; | |
113 | ipaddr->s6_addr[1] = 0x80; | |
114 | ipaddr->s6_addr[11] = 0xFF; | |
115 | ipaddr->s6_addr[12] = 0xFE; | |
116 | ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr)); | |
117 | break; | |
118 | default: | |
119 | pr_debug("Invalid addr_type set\n"); | |
120 | return -EINVAL; | |
121 | } | |
122 | break; | |
123 | default: | |
124 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | if (fail) { | |
129 | pr_debug("Failed to fetch skb data\n"); | |
130 | return -EIO; | |
131 | } | |
132 | ||
133 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
134 | ipaddr->s6_addr, 16); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
4710d806 | 139 | /* Uncompress address function for source context |
8df8c56a JR |
140 | * based address(non-multicast). |
141 | */ | |
142 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
4710d806 VB |
143 | struct in6_addr *ipaddr, |
144 | const u8 sam) | |
8df8c56a JR |
145 | { |
146 | switch (sam) { | |
147 | case LOWPAN_IPHC_ADDR_00: | |
148 | /* unspec address :: | |
149 | * Do nothing, address is already :: | |
150 | */ | |
151 | break; | |
152 | case LOWPAN_IPHC_ADDR_01: | |
153 | /* TODO */ | |
154 | case LOWPAN_IPHC_ADDR_02: | |
155 | /* TODO */ | |
156 | case LOWPAN_IPHC_ADDR_03: | |
157 | /* TODO */ | |
158 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); | |
159 | return -EINVAL; | |
160 | default: | |
161 | pr_debug("Invalid sam value: 0x%x\n", sam); | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | raw_dump_inline(NULL, | |
166 | "Reconstructed context based ipv6 src addr is", | |
167 | ipaddr->s6_addr, 16); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
8df8c56a JR |
172 | /* Uncompress function for multicast destination address, |
173 | * when M bit is set. | |
174 | */ | |
7fc4cfda MH |
175 | static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb, |
176 | struct in6_addr *ipaddr, | |
177 | const u8 dam) | |
8df8c56a JR |
178 | { |
179 | bool fail; | |
180 | ||
181 | switch (dam) { | |
182 | case LOWPAN_IPHC_DAM_00: | |
183 | /* 00: 128 bits. The full address | |
184 | * is carried in-line. | |
185 | */ | |
186 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
187 | break; | |
188 | case LOWPAN_IPHC_DAM_01: | |
189 | /* 01: 48 bits. The address takes | |
190 | * the form ffXX::00XX:XXXX:XXXX. | |
191 | */ | |
192 | ipaddr->s6_addr[0] = 0xFF; | |
193 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
194 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
195 | break; | |
196 | case LOWPAN_IPHC_DAM_10: | |
197 | /* 10: 32 bits. The address takes | |
198 | * the form ffXX::00XX:XXXX. | |
199 | */ | |
200 | ipaddr->s6_addr[0] = 0xFF; | |
201 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
202 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
203 | break; | |
204 | case LOWPAN_IPHC_DAM_11: | |
205 | /* 11: 8 bits. The address takes | |
206 | * the form ff02::00XX. | |
207 | */ | |
208 | ipaddr->s6_addr[0] = 0xFF; | |
209 | ipaddr->s6_addr[1] = 0x02; | |
210 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
211 | break; | |
212 | default: | |
213 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | if (fail) { | |
218 | pr_debug("Failed to fetch skb data\n"); | |
219 | return -EIO; | |
220 | } | |
221 | ||
222 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
7fc4cfda | 223 | ipaddr->s6_addr, 16); |
8df8c56a JR |
224 | |
225 | return 0; | |
226 | } | |
227 | ||
8df8c56a JR |
228 | /* TTL uncompression values */ |
229 | static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; | |
230 | ||
01141234 MT |
231 | int |
232 | lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev, | |
233 | const u8 *saddr, const u8 saddr_type, | |
234 | const u8 saddr_len, const u8 *daddr, | |
235 | const u8 daddr_type, const u8 daddr_len, | |
236 | u8 iphc0, u8 iphc1) | |
8df8c56a JR |
237 | { |
238 | struct ipv6hdr hdr = {}; | |
239 | u8 tmp, num_context = 0; | |
240 | int err; | |
241 | ||
242 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
4710d806 | 243 | skb->data, skb->len); |
8df8c56a JR |
244 | |
245 | /* another if the CID flag is set */ | |
246 | if (iphc1 & LOWPAN_IPHC_CID) { | |
247 | pr_debug("CID flag is set, increase header with one\n"); | |
4ebc960f | 248 | if (lowpan_fetch_skb(skb, &num_context, sizeof(num_context))) |
56b2c3ee | 249 | return -EINVAL; |
8df8c56a JR |
250 | } |
251 | ||
252 | hdr.version = 6; | |
253 | ||
254 | /* Traffic Class and Flow Label */ | |
255 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
4710d806 | 256 | /* Traffic Class and FLow Label carried in-line |
8df8c56a JR |
257 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) |
258 | */ | |
259 | case 0: /* 00b */ | |
4ebc960f | 260 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 261 | return -EINVAL; |
8df8c56a JR |
262 | |
263 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
264 | skb_pull(skb, 3); | |
265 | hdr.priority = ((tmp >> 2) & 0x0f); | |
266 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
267 | (hdr.flow_lbl[0] & 0x0f); | |
268 | break; | |
4710d806 | 269 | /* Traffic class carried in-line |
8df8c56a JR |
270 | * ECN + DSCP (1 byte), Flow Label is elided |
271 | */ | |
272 | case 2: /* 10b */ | |
4ebc960f | 273 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 274 | return -EINVAL; |
8df8c56a JR |
275 | |
276 | hdr.priority = ((tmp >> 2) & 0x0f); | |
277 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
278 | break; | |
4710d806 | 279 | /* Flow Label carried in-line |
8df8c56a JR |
280 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided |
281 | */ | |
282 | case 1: /* 01b */ | |
4ebc960f | 283 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 284 | return -EINVAL; |
8df8c56a | 285 | |
77e867b5 | 286 | hdr.flow_lbl[0] = (tmp & 0x0F) | ((tmp >> 2) & 0x30); |
8df8c56a JR |
287 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); |
288 | skb_pull(skb, 2); | |
289 | break; | |
290 | /* Traffic Class and Flow Label are elided */ | |
291 | case 3: /* 11b */ | |
292 | break; | |
293 | default: | |
294 | break; | |
295 | } | |
296 | ||
297 | /* Next Header */ | |
298 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
299 | /* Next header is carried inline */ | |
4ebc960f | 300 | if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) |
56b2c3ee | 301 | return -EINVAL; |
8df8c56a JR |
302 | |
303 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
304 | hdr.nexthdr); | |
305 | } | |
306 | ||
307 | /* Hop Limit */ | |
4710d806 | 308 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) { |
8df8c56a | 309 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; |
4710d806 | 310 | } else { |
4ebc960f AA |
311 | if (lowpan_fetch_skb(skb, &hdr.hop_limit, |
312 | sizeof(hdr.hop_limit))) | |
56b2c3ee | 313 | return -EINVAL; |
8df8c56a JR |
314 | } |
315 | ||
316 | /* Extract SAM to the tmp variable */ | |
317 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
318 | ||
319 | if (iphc1 & LOWPAN_IPHC_SAC) { | |
320 | /* Source address context based uncompression */ | |
321 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
7fc4cfda | 322 | err = uncompress_context_based_src_addr(skb, &hdr.saddr, tmp); |
8df8c56a JR |
323 | } else { |
324 | /* Source address uncompression */ | |
325 | pr_debug("source address stateless compression\n"); | |
326 | err = uncompress_addr(skb, &hdr.saddr, tmp, saddr, | |
4710d806 | 327 | saddr_type, saddr_len); |
8df8c56a JR |
328 | } |
329 | ||
330 | /* Check on error of previous branch */ | |
331 | if (err) | |
56b2c3ee | 332 | return -EINVAL; |
8df8c56a JR |
333 | |
334 | /* Extract DAM to the tmp variable */ | |
335 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
336 | ||
337 | /* check for Multicast Compression */ | |
338 | if (iphc1 & LOWPAN_IPHC_M) { | |
339 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
340 | pr_debug("dest: context-based mcast compression\n"); | |
341 | /* TODO: implement this */ | |
342 | } else { | |
7fc4cfda MH |
343 | err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr, |
344 | tmp); | |
345 | ||
8df8c56a | 346 | if (err) |
56b2c3ee | 347 | return -EINVAL; |
8df8c56a JR |
348 | } |
349 | } else { | |
350 | err = uncompress_addr(skb, &hdr.daddr, tmp, daddr, | |
4710d806 | 351 | daddr_type, daddr_len); |
8df8c56a | 352 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", |
4710d806 | 353 | tmp, &hdr.daddr); |
8df8c56a | 354 | if (err) |
56b2c3ee | 355 | return -EINVAL; |
8df8c56a JR |
356 | } |
357 | ||
cc6ed268 | 358 | /* Next header data uncompression */ |
8df8c56a | 359 | if (iphc0 & LOWPAN_IPHC_NH_C) { |
cc6ed268 AA |
360 | err = lowpan_nhc_do_uncompression(skb, dev, &hdr); |
361 | if (err < 0) | |
11e3ff70 | 362 | return err; |
11e3ff70 MT |
363 | } else { |
364 | err = skb_cow(skb, sizeof(hdr)); | |
56b2c3ee | 365 | if (unlikely(err)) |
11e3ff70 | 366 | return err; |
8df8c56a JR |
367 | } |
368 | ||
72a5e6bb AA |
369 | switch (lowpan_priv(dev)->lltype) { |
370 | case LOWPAN_LLTYPE_IEEE802154: | |
371 | if (lowpan_802154_cb(skb)->d_size) | |
372 | hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size - | |
373 | sizeof(struct ipv6hdr)); | |
374 | else | |
375 | hdr.payload_len = htons(skb->len); | |
376 | break; | |
377 | default: | |
378 | hdr.payload_len = htons(skb->len); | |
379 | break; | |
380 | } | |
8df8c56a JR |
381 | |
382 | pr_debug("skb headroom size = %d, data length = %d\n", | |
383 | skb_headroom(skb), skb->len); | |
384 | ||
385 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
386 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
387 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
388 | hdr.hop_limit, &hdr.daddr); | |
389 | ||
f8b36176 MT |
390 | skb_push(skb, sizeof(hdr)); |
391 | skb_reset_network_header(skb); | |
392 | skb_copy_to_linear_data(skb, &hdr, sizeof(hdr)); | |
8df8c56a | 393 | |
f8b36176 | 394 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr)); |
8df8c56a | 395 | |
f8b36176 | 396 | return 0; |
8df8c56a | 397 | } |
01141234 | 398 | EXPORT_SYMBOL_GPL(lowpan_header_decompress); |
8df8c56a | 399 | |
84ca5e03 | 400 | static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift, |
4710d806 VB |
401 | const struct in6_addr *ipaddr, |
402 | const unsigned char *lladdr) | |
8df8c56a JR |
403 | { |
404 | u8 val = 0; | |
405 | ||
406 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
407 | val = 3; /* 0-bits */ | |
408 | pr_debug("address compression 0 bits\n"); | |
409 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
410 | /* compress IID to 16 bits xxxx::XXXX */ | |
85c71240 | 411 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2); |
8df8c56a JR |
412 | val = 2; /* 16-bits */ |
413 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", | |
84ca5e03 | 414 | *hc_ptr - 2, 2); |
8df8c56a JR |
415 | } else { |
416 | /* do not compress IID => xxxx::IID */ | |
85c71240 | 417 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8); |
8df8c56a JR |
418 | val = 1; /* 64-bits */ |
419 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", | |
84ca5e03 | 420 | *hc_ptr - 8, 8); |
8df8c56a JR |
421 | } |
422 | ||
423 | return rol8(val, shift); | |
424 | } | |
425 | ||
8df8c56a | 426 | int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, |
4710d806 VB |
427 | unsigned short type, const void *_daddr, |
428 | const void *_saddr, unsigned int len) | |
8df8c56a | 429 | { |
84ca5e03 | 430 | u8 tmp, iphc0, iphc1, *hc_ptr; |
8df8c56a JR |
431 | struct ipv6hdr *hdr; |
432 | u8 head[100] = {}; | |
cc6ed268 | 433 | int ret, addr_type; |
8df8c56a JR |
434 | |
435 | if (type != ETH_P_IPV6) | |
436 | return -EINVAL; | |
437 | ||
438 | hdr = ipv6_hdr(skb); | |
84ca5e03 | 439 | hc_ptr = head + 2; |
8df8c56a JR |
440 | |
441 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
442 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
4710d806 VB |
443 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
444 | hdr->hop_limit, &hdr->daddr); | |
8df8c56a JR |
445 | |
446 | raw_dump_table(__func__, "raw skb network header dump", | |
4710d806 | 447 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
8df8c56a | 448 | |
4710d806 | 449 | /* As we copy some bit-length fields, in the IPHC encoding bytes, |
8df8c56a JR |
450 | * we sometimes use |= |
451 | * If the field is 0, and the current bit value in memory is 1, | |
452 | * this does not work. We therefore reset the IPHC encoding here | |
453 | */ | |
454 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
455 | iphc1 = 0; | |
456 | ||
457 | /* TODO: context lookup */ | |
458 | ||
459 | raw_dump_inline(__func__, "saddr", | |
460 | (unsigned char *)_saddr, IEEE802154_ADDR_LEN); | |
461 | raw_dump_inline(__func__, "daddr", | |
462 | (unsigned char *)_daddr, IEEE802154_ADDR_LEN); | |
463 | ||
7fc4cfda | 464 | raw_dump_table(__func__, "sending raw skb network uncompressed packet", |
4710d806 | 465 | skb->data, skb->len); |
8df8c56a | 466 | |
4710d806 | 467 | /* Traffic class, flow label |
8df8c56a JR |
468 | * If flow label is 0, compress it. If traffic class is 0, compress it |
469 | * We have to process both in the same time as the offset of traffic | |
470 | * class depends on the presence of version and flow label | |
471 | */ | |
472 | ||
84ca5e03 | 473 | /* hc format of TC is ECN | DSCP , original one is DSCP | ECN */ |
8df8c56a JR |
474 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); |
475 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
476 | ||
477 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
4710d806 | 478 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { |
8df8c56a JR |
479 | /* flow label can be compressed */ |
480 | iphc0 |= LOWPAN_IPHC_FL_C; | |
481 | if ((hdr->priority == 0) && | |
4710d806 | 482 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
483 | /* compress (elide) all */ |
484 | iphc0 |= LOWPAN_IPHC_TC_C; | |
485 | } else { | |
486 | /* compress only the flow label */ | |
84ca5e03 AA |
487 | *hc_ptr = tmp; |
488 | hc_ptr += 1; | |
8df8c56a JR |
489 | } |
490 | } else { | |
491 | /* Flow label cannot be compressed */ | |
492 | if ((hdr->priority == 0) && | |
4710d806 | 493 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
494 | /* compress only traffic class */ |
495 | iphc0 |= LOWPAN_IPHC_TC_C; | |
84ca5e03 AA |
496 | *hc_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); |
497 | memcpy(hc_ptr + 1, &hdr->flow_lbl[1], 2); | |
498 | hc_ptr += 3; | |
8df8c56a JR |
499 | } else { |
500 | /* compress nothing */ | |
84ca5e03 | 501 | memcpy(hc_ptr, hdr, 4); |
8df8c56a | 502 | /* replace the top byte with new ECN | DSCP format */ |
84ca5e03 AA |
503 | *hc_ptr = tmp; |
504 | hc_ptr += 4; | |
8df8c56a JR |
505 | } |
506 | } | |
507 | ||
508 | /* NOTE: payload length is always compressed */ | |
509 | ||
cc6ed268 AA |
510 | /* Check if we provide the nhc format for nexthdr and compression |
511 | * functionality. If not nexthdr is handled inline and not compressed. | |
512 | */ | |
513 | ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr, &iphc0); | |
514 | if (ret < 0) | |
515 | return ret; | |
8df8c56a | 516 | |
4710d806 | 517 | /* Hop limit |
8df8c56a JR |
518 | * if 1: compress, encoding is 01 |
519 | * if 64: compress, encoding is 10 | |
520 | * if 255: compress, encoding is 11 | |
521 | * else do not compress | |
522 | */ | |
523 | switch (hdr->hop_limit) { | |
524 | case 1: | |
525 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
526 | break; | |
527 | case 64: | |
528 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
529 | break; | |
530 | case 255: | |
531 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
532 | break; | |
533 | default: | |
85c71240 AA |
534 | lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit, |
535 | sizeof(hdr->hop_limit)); | |
8df8c56a JR |
536 | } |
537 | ||
556a5bfc | 538 | addr_type = ipv6_addr_type(&hdr->saddr); |
8df8c56a | 539 | /* source address compression */ |
556a5bfc | 540 | if (addr_type == IPV6_ADDR_ANY) { |
8df8c56a JR |
541 | pr_debug("source address is unspecified, setting SAC\n"); |
542 | iphc1 |= LOWPAN_IPHC_SAC; | |
8df8c56a | 543 | } else { |
556a5bfc AA |
544 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
545 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, | |
546 | LOWPAN_IPHC_SAM_BIT, | |
547 | &hdr->saddr, _saddr); | |
548 | pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n", | |
549 | &hdr->saddr, iphc1); | |
550 | } else { | |
551 | pr_debug("send the full source address\n"); | |
552 | lowpan_push_hc_data(&hc_ptr, hdr->saddr.s6_addr, 16); | |
553 | } | |
8df8c56a JR |
554 | } |
555 | ||
556a5bfc | 556 | addr_type = ipv6_addr_type(&hdr->daddr); |
8df8c56a | 557 | /* destination address compression */ |
556a5bfc | 558 | if (addr_type & IPV6_ADDR_MULTICAST) { |
8df8c56a JR |
559 | pr_debug("destination address is multicast: "); |
560 | iphc1 |= LOWPAN_IPHC_M; | |
561 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
562 | pr_debug("compressed to 1 octet\n"); | |
563 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
564 | /* use last byte */ | |
85c71240 AA |
565 | lowpan_push_hc_data(&hc_ptr, |
566 | &hdr->daddr.s6_addr[15], 1); | |
8df8c56a JR |
567 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { |
568 | pr_debug("compressed to 4 octets\n"); | |
569 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
570 | /* second byte + the last three */ | |
85c71240 AA |
571 | lowpan_push_hc_data(&hc_ptr, |
572 | &hdr->daddr.s6_addr[1], 1); | |
573 | lowpan_push_hc_data(&hc_ptr, | |
574 | &hdr->daddr.s6_addr[13], 3); | |
8df8c56a JR |
575 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { |
576 | pr_debug("compressed to 6 octets\n"); | |
577 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
578 | /* second byte + the last five */ | |
85c71240 AA |
579 | lowpan_push_hc_data(&hc_ptr, |
580 | &hdr->daddr.s6_addr[1], 1); | |
581 | lowpan_push_hc_data(&hc_ptr, | |
582 | &hdr->daddr.s6_addr[11], 5); | |
8df8c56a JR |
583 | } else { |
584 | pr_debug("using full address\n"); | |
585 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
85c71240 | 586 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
587 | } |
588 | } else { | |
556a5bfc AA |
589 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
590 | /* TODO: context lookup */ | |
84ca5e03 | 591 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
8df8c56a JR |
592 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr); |
593 | pr_debug("dest address unicast link-local %pI6c " | |
7fc4cfda | 594 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); |
8df8c56a JR |
595 | } else { |
596 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
85c71240 | 597 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
598 | } |
599 | } | |
600 | ||
cc6ed268 AA |
601 | /* next header compression */ |
602 | if (iphc0 & LOWPAN_IPHC_NH_C) { | |
603 | ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr); | |
604 | if (ret < 0) | |
605 | return ret; | |
606 | } | |
8df8c56a JR |
607 | |
608 | head[0] = iphc0; | |
609 | head[1] = iphc1; | |
610 | ||
611 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
612 | skb_reset_transport_header(skb); | |
84ca5e03 | 613 | memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); |
8df8c56a JR |
614 | skb_reset_network_header(skb); |
615 | ||
84ca5e03 | 616 | pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); |
8df8c56a JR |
617 | |
618 | raw_dump_table(__func__, "raw skb data dump compressed", | |
4710d806 | 619 | skb->data, skb->len); |
8df8c56a JR |
620 | return 0; |
621 | } | |
622 | EXPORT_SYMBOL_GPL(lowpan_header_compress); |