Commit | Line | Data |
---|---|---|
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 | ||
8911d774 AA |
61 | static inline void iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr, |
62 | const void *lladdr) | |
63 | { | |
64 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
65 | * \_________________/ | |
66 | * hwaddr | |
67 | */ | |
68 | ipaddr->s6_addr[0] = 0xFE; | |
69 | ipaddr->s6_addr[1] = 0x80; | |
70 | memcpy(&ipaddr->s6_addr[8], lladdr, EUI64_ADDR_LEN); | |
71 | /* second bit-flip (Universe/Local) | |
72 | * is done according RFC2464 | |
73 | */ | |
74 | ipaddr->s6_addr[8] ^= 0x02; | |
75 | } | |
76 | ||
77 | static inline void iphc_uncompress_802154_lladdr(struct in6_addr *ipaddr, | |
78 | const void *lladdr) | |
79 | { | |
80 | const struct ieee802154_addr *addr = lladdr; | |
81 | u8 eui64[EUI64_ADDR_LEN] = { }; | |
82 | ||
83 | switch (addr->mode) { | |
84 | case IEEE802154_ADDR_LONG: | |
85 | ieee802154_le64_to_be64(eui64, &addr->extended_addr); | |
86 | iphc_uncompress_eui64_lladdr(ipaddr, eui64); | |
87 | break; | |
88 | case IEEE802154_ADDR_SHORT: | |
89 | /* fe:80::ff:fe00:XXXX | |
90 | * \__/ | |
91 | * short_addr | |
92 | * | |
93 | * Universe/Local bit is zero. | |
94 | */ | |
95 | ipaddr->s6_addr[0] = 0xFE; | |
96 | ipaddr->s6_addr[1] = 0x80; | |
97 | ipaddr->s6_addr[11] = 0xFF; | |
98 | ipaddr->s6_addr[12] = 0xFE; | |
99 | ieee802154_le16_to_be16(&ipaddr->s6_addr16[7], | |
100 | &addr->short_addr); | |
101 | break; | |
102 | default: | |
103 | /* should never handled and filtered by 802154 6lowpan */ | |
104 | WARN_ON_ONCE(1); | |
105 | break; | |
106 | } | |
107 | } | |
108 | ||
4710d806 | 109 | /* Uncompress address function for source and |
8df8c56a JR |
110 | * destination address(non-multicast). |
111 | * | |
112 | * address_mode is sam value or dam value. | |
113 | */ | |
8911d774 AA |
114 | static int uncompress_addr(struct sk_buff *skb, const struct net_device *dev, |
115 | struct in6_addr *ipaddr, u8 address_mode, | |
116 | const void *lladdr) | |
8df8c56a JR |
117 | { |
118 | bool fail; | |
119 | ||
120 | switch (address_mode) { | |
121 | case LOWPAN_IPHC_ADDR_00: | |
122 | /* for global link addresses */ | |
123 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
124 | break; | |
125 | case LOWPAN_IPHC_ADDR_01: | |
126 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ | |
127 | ipaddr->s6_addr[0] = 0xFE; | |
128 | ipaddr->s6_addr[1] = 0x80; | |
129 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
130 | break; | |
131 | case LOWPAN_IPHC_ADDR_02: | |
132 | /* fe:80::ff:fe00:XXXX */ | |
133 | ipaddr->s6_addr[0] = 0xFE; | |
134 | ipaddr->s6_addr[1] = 0x80; | |
135 | ipaddr->s6_addr[11] = 0xFF; | |
136 | ipaddr->s6_addr[12] = 0xFE; | |
137 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
138 | break; | |
139 | case LOWPAN_IPHC_ADDR_03: | |
140 | fail = false; | |
8911d774 AA |
141 | switch (lowpan_priv(dev)->lltype) { |
142 | case LOWPAN_LLTYPE_IEEE802154: | |
143 | iphc_uncompress_802154_lladdr(ipaddr, lladdr); | |
8df8c56a JR |
144 | break; |
145 | default: | |
8911d774 AA |
146 | iphc_uncompress_eui64_lladdr(ipaddr, lladdr); |
147 | break; | |
8df8c56a JR |
148 | } |
149 | break; | |
150 | default: | |
151 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
152 | return -EINVAL; | |
153 | } | |
154 | ||
155 | if (fail) { | |
156 | pr_debug("Failed to fetch skb data\n"); | |
157 | return -EIO; | |
158 | } | |
159 | ||
160 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
161 | ipaddr->s6_addr, 16); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
4710d806 | 166 | /* Uncompress address function for source context |
8df8c56a JR |
167 | * based address(non-multicast). |
168 | */ | |
169 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
4710d806 VB |
170 | struct in6_addr *ipaddr, |
171 | const u8 sam) | |
8df8c56a JR |
172 | { |
173 | switch (sam) { | |
174 | case LOWPAN_IPHC_ADDR_00: | |
175 | /* unspec address :: | |
176 | * Do nothing, address is already :: | |
177 | */ | |
178 | break; | |
179 | case LOWPAN_IPHC_ADDR_01: | |
180 | /* TODO */ | |
181 | case LOWPAN_IPHC_ADDR_02: | |
182 | /* TODO */ | |
183 | case LOWPAN_IPHC_ADDR_03: | |
184 | /* TODO */ | |
185 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); | |
186 | return -EINVAL; | |
187 | default: | |
188 | pr_debug("Invalid sam value: 0x%x\n", sam); | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | raw_dump_inline(NULL, | |
193 | "Reconstructed context based ipv6 src addr is", | |
194 | ipaddr->s6_addr, 16); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
8df8c56a JR |
199 | /* Uncompress function for multicast destination address, |
200 | * when M bit is set. | |
201 | */ | |
7fc4cfda MH |
202 | static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb, |
203 | struct in6_addr *ipaddr, | |
204 | const u8 dam) | |
8df8c56a JR |
205 | { |
206 | bool fail; | |
207 | ||
208 | switch (dam) { | |
209 | case LOWPAN_IPHC_DAM_00: | |
210 | /* 00: 128 bits. The full address | |
211 | * is carried in-line. | |
212 | */ | |
213 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
214 | break; | |
215 | case LOWPAN_IPHC_DAM_01: | |
216 | /* 01: 48 bits. The address takes | |
217 | * the form ffXX::00XX:XXXX:XXXX. | |
218 | */ | |
219 | ipaddr->s6_addr[0] = 0xFF; | |
220 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
221 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
222 | break; | |
223 | case LOWPAN_IPHC_DAM_10: | |
224 | /* 10: 32 bits. The address takes | |
225 | * the form ffXX::00XX:XXXX. | |
226 | */ | |
227 | ipaddr->s6_addr[0] = 0xFF; | |
228 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
229 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
230 | break; | |
231 | case LOWPAN_IPHC_DAM_11: | |
232 | /* 11: 8 bits. The address takes | |
233 | * the form ff02::00XX. | |
234 | */ | |
235 | ipaddr->s6_addr[0] = 0xFF; | |
236 | ipaddr->s6_addr[1] = 0x02; | |
237 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
238 | break; | |
239 | default: | |
240 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | if (fail) { | |
245 | pr_debug("Failed to fetch skb data\n"); | |
246 | return -EIO; | |
247 | } | |
248 | ||
249 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
7fc4cfda | 250 | ipaddr->s6_addr, 16); |
8df8c56a JR |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
8df8c56a JR |
255 | /* TTL uncompression values */ |
256 | static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; | |
257 | ||
8911d774 AA |
258 | int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, |
259 | const void *daddr, const void *saddr) | |
8df8c56a JR |
260 | { |
261 | struct ipv6hdr hdr = {}; | |
8911d774 | 262 | u8 iphc0, iphc1, tmp, num_context = 0; |
8df8c56a JR |
263 | int err; |
264 | ||
265 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
4710d806 | 266 | skb->data, skb->len); |
8df8c56a | 267 | |
478208e3 AA |
268 | if (lowpan_fetch_skb(skb, &iphc0, sizeof(iphc0)) || |
269 | lowpan_fetch_skb(skb, &iphc1, sizeof(iphc1))) | |
8911d774 AA |
270 | return -EINVAL; |
271 | ||
8df8c56a JR |
272 | /* another if the CID flag is set */ |
273 | if (iphc1 & LOWPAN_IPHC_CID) { | |
274 | pr_debug("CID flag is set, increase header with one\n"); | |
4ebc960f | 275 | if (lowpan_fetch_skb(skb, &num_context, sizeof(num_context))) |
56b2c3ee | 276 | return -EINVAL; |
8df8c56a JR |
277 | } |
278 | ||
279 | hdr.version = 6; | |
280 | ||
281 | /* Traffic Class and Flow Label */ | |
282 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
4710d806 | 283 | /* Traffic Class and FLow Label carried in-line |
8df8c56a JR |
284 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) |
285 | */ | |
286 | case 0: /* 00b */ | |
4ebc960f | 287 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 288 | return -EINVAL; |
8df8c56a JR |
289 | |
290 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
291 | skb_pull(skb, 3); | |
292 | hdr.priority = ((tmp >> 2) & 0x0f); | |
293 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
294 | (hdr.flow_lbl[0] & 0x0f); | |
295 | break; | |
4710d806 | 296 | /* Traffic class carried in-line |
8df8c56a JR |
297 | * ECN + DSCP (1 byte), Flow Label is elided |
298 | */ | |
299 | case 2: /* 10b */ | |
4ebc960f | 300 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 301 | return -EINVAL; |
8df8c56a JR |
302 | |
303 | hdr.priority = ((tmp >> 2) & 0x0f); | |
304 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
305 | break; | |
4710d806 | 306 | /* Flow Label carried in-line |
8df8c56a JR |
307 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided |
308 | */ | |
309 | case 1: /* 01b */ | |
4ebc960f | 310 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
56b2c3ee | 311 | return -EINVAL; |
8df8c56a | 312 | |
77e867b5 | 313 | hdr.flow_lbl[0] = (tmp & 0x0F) | ((tmp >> 2) & 0x30); |
8df8c56a JR |
314 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); |
315 | skb_pull(skb, 2); | |
316 | break; | |
317 | /* Traffic Class and Flow Label are elided */ | |
318 | case 3: /* 11b */ | |
319 | break; | |
320 | default: | |
321 | break; | |
322 | } | |
323 | ||
324 | /* Next Header */ | |
325 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
326 | /* Next header is carried inline */ | |
4ebc960f | 327 | if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) |
56b2c3ee | 328 | return -EINVAL; |
8df8c56a JR |
329 | |
330 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
331 | hdr.nexthdr); | |
332 | } | |
333 | ||
334 | /* Hop Limit */ | |
4710d806 | 335 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) { |
8df8c56a | 336 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; |
4710d806 | 337 | } else { |
4ebc960f AA |
338 | if (lowpan_fetch_skb(skb, &hdr.hop_limit, |
339 | sizeof(hdr.hop_limit))) | |
56b2c3ee | 340 | return -EINVAL; |
8df8c56a JR |
341 | } |
342 | ||
343 | /* Extract SAM to the tmp variable */ | |
344 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
345 | ||
346 | if (iphc1 & LOWPAN_IPHC_SAC) { | |
347 | /* Source address context based uncompression */ | |
348 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
7fc4cfda | 349 | err = uncompress_context_based_src_addr(skb, &hdr.saddr, tmp); |
8df8c56a JR |
350 | } else { |
351 | /* Source address uncompression */ | |
352 | pr_debug("source address stateless compression\n"); | |
8911d774 | 353 | err = uncompress_addr(skb, dev, &hdr.saddr, tmp, saddr); |
8df8c56a JR |
354 | } |
355 | ||
356 | /* Check on error of previous branch */ | |
357 | if (err) | |
56b2c3ee | 358 | return -EINVAL; |
8df8c56a JR |
359 | |
360 | /* Extract DAM to the tmp variable */ | |
361 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
362 | ||
363 | /* check for Multicast Compression */ | |
364 | if (iphc1 & LOWPAN_IPHC_M) { | |
365 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
366 | pr_debug("dest: context-based mcast compression\n"); | |
367 | /* TODO: implement this */ | |
368 | } else { | |
7fc4cfda MH |
369 | err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr, |
370 | tmp); | |
371 | ||
8df8c56a | 372 | if (err) |
56b2c3ee | 373 | return -EINVAL; |
8df8c56a JR |
374 | } |
375 | } else { | |
8911d774 | 376 | err = uncompress_addr(skb, dev, &hdr.daddr, tmp, daddr); |
8df8c56a | 377 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", |
4710d806 | 378 | tmp, &hdr.daddr); |
8df8c56a | 379 | if (err) |
56b2c3ee | 380 | return -EINVAL; |
8df8c56a JR |
381 | } |
382 | ||
cc6ed268 | 383 | /* Next header data uncompression */ |
8df8c56a | 384 | if (iphc0 & LOWPAN_IPHC_NH_C) { |
cc6ed268 AA |
385 | err = lowpan_nhc_do_uncompression(skb, dev, &hdr); |
386 | if (err < 0) | |
11e3ff70 | 387 | return err; |
11e3ff70 MT |
388 | } else { |
389 | err = skb_cow(skb, sizeof(hdr)); | |
56b2c3ee | 390 | if (unlikely(err)) |
11e3ff70 | 391 | return err; |
8df8c56a JR |
392 | } |
393 | ||
72a5e6bb AA |
394 | switch (lowpan_priv(dev)->lltype) { |
395 | case LOWPAN_LLTYPE_IEEE802154: | |
396 | if (lowpan_802154_cb(skb)->d_size) | |
397 | hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size - | |
398 | sizeof(struct ipv6hdr)); | |
399 | else | |
400 | hdr.payload_len = htons(skb->len); | |
401 | break; | |
402 | default: | |
403 | hdr.payload_len = htons(skb->len); | |
404 | break; | |
405 | } | |
8df8c56a JR |
406 | |
407 | pr_debug("skb headroom size = %d, data length = %d\n", | |
408 | skb_headroom(skb), skb->len); | |
409 | ||
410 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
411 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
412 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
413 | hdr.hop_limit, &hdr.daddr); | |
414 | ||
f8b36176 MT |
415 | skb_push(skb, sizeof(hdr)); |
416 | skb_reset_network_header(skb); | |
417 | skb_copy_to_linear_data(skb, &hdr, sizeof(hdr)); | |
8df8c56a | 418 | |
f8b36176 | 419 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr)); |
8df8c56a | 420 | |
f8b36176 | 421 | return 0; |
8df8c56a | 422 | } |
01141234 | 423 | EXPORT_SYMBOL_GPL(lowpan_header_decompress); |
8df8c56a | 424 | |
84ca5e03 | 425 | static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift, |
4710d806 VB |
426 | const struct in6_addr *ipaddr, |
427 | const unsigned char *lladdr) | |
8df8c56a JR |
428 | { |
429 | u8 val = 0; | |
430 | ||
431 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
432 | val = 3; /* 0-bits */ | |
433 | pr_debug("address compression 0 bits\n"); | |
434 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
435 | /* compress IID to 16 bits xxxx::XXXX */ | |
85c71240 | 436 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2); |
8df8c56a JR |
437 | val = 2; /* 16-bits */ |
438 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", | |
84ca5e03 | 439 | *hc_ptr - 2, 2); |
8df8c56a JR |
440 | } else { |
441 | /* do not compress IID => xxxx::IID */ | |
85c71240 | 442 | lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8); |
8df8c56a JR |
443 | val = 1; /* 64-bits */ |
444 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", | |
84ca5e03 | 445 | *hc_ptr - 8, 8); |
8df8c56a JR |
446 | } |
447 | ||
448 | return rol8(val, shift); | |
449 | } | |
450 | ||
a6f77389 AA |
451 | int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, |
452 | const void *daddr, const void *saddr) | |
8df8c56a | 453 | { |
84ca5e03 | 454 | u8 tmp, iphc0, iphc1, *hc_ptr; |
8df8c56a | 455 | struct ipv6hdr *hdr; |
bf513fd6 | 456 | u8 head[LOWPAN_IPHC_MAX_HC_BUF_LEN] = {}; |
cc6ed268 | 457 | int ret, addr_type; |
8df8c56a | 458 | |
a6f77389 | 459 | if (skb->protocol != htons(ETH_P_IPV6)) |
8df8c56a JR |
460 | return -EINVAL; |
461 | ||
462 | hdr = ipv6_hdr(skb); | |
84ca5e03 | 463 | hc_ptr = head + 2; |
8df8c56a JR |
464 | |
465 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
466 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
4710d806 VB |
467 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
468 | hdr->hop_limit, &hdr->daddr); | |
8df8c56a JR |
469 | |
470 | raw_dump_table(__func__, "raw skb network header dump", | |
4710d806 | 471 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
8df8c56a | 472 | |
4710d806 | 473 | /* As we copy some bit-length fields, in the IPHC encoding bytes, |
8df8c56a JR |
474 | * we sometimes use |= |
475 | * If the field is 0, and the current bit value in memory is 1, | |
476 | * this does not work. We therefore reset the IPHC encoding here | |
477 | */ | |
478 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
479 | iphc1 = 0; | |
480 | ||
481 | /* TODO: context lookup */ | |
482 | ||
a6f77389 AA |
483 | raw_dump_inline(__func__, "saddr", saddr, EUI64_ADDR_LEN); |
484 | raw_dump_inline(__func__, "daddr", daddr, EUI64_ADDR_LEN); | |
8df8c56a | 485 | |
7fc4cfda | 486 | raw_dump_table(__func__, "sending raw skb network uncompressed packet", |
4710d806 | 487 | skb->data, skb->len); |
8df8c56a | 488 | |
4710d806 | 489 | /* Traffic class, flow label |
8df8c56a JR |
490 | * If flow label is 0, compress it. If traffic class is 0, compress it |
491 | * We have to process both in the same time as the offset of traffic | |
492 | * class depends on the presence of version and flow label | |
493 | */ | |
494 | ||
84ca5e03 | 495 | /* hc format of TC is ECN | DSCP , original one is DSCP | ECN */ |
8df8c56a JR |
496 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); |
497 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
498 | ||
499 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
4710d806 | 500 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { |
8df8c56a JR |
501 | /* flow label can be compressed */ |
502 | iphc0 |= LOWPAN_IPHC_FL_C; | |
503 | if ((hdr->priority == 0) && | |
4710d806 | 504 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
505 | /* compress (elide) all */ |
506 | iphc0 |= LOWPAN_IPHC_TC_C; | |
507 | } else { | |
508 | /* compress only the flow label */ | |
84ca5e03 AA |
509 | *hc_ptr = tmp; |
510 | hc_ptr += 1; | |
8df8c56a JR |
511 | } |
512 | } else { | |
513 | /* Flow label cannot be compressed */ | |
514 | if ((hdr->priority == 0) && | |
4710d806 | 515 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
516 | /* compress only traffic class */ |
517 | iphc0 |= LOWPAN_IPHC_TC_C; | |
84ca5e03 AA |
518 | *hc_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); |
519 | memcpy(hc_ptr + 1, &hdr->flow_lbl[1], 2); | |
520 | hc_ptr += 3; | |
8df8c56a JR |
521 | } else { |
522 | /* compress nothing */ | |
84ca5e03 | 523 | memcpy(hc_ptr, hdr, 4); |
8df8c56a | 524 | /* replace the top byte with new ECN | DSCP format */ |
84ca5e03 AA |
525 | *hc_ptr = tmp; |
526 | hc_ptr += 4; | |
8df8c56a JR |
527 | } |
528 | } | |
529 | ||
530 | /* NOTE: payload length is always compressed */ | |
531 | ||
cc6ed268 AA |
532 | /* Check if we provide the nhc format for nexthdr and compression |
533 | * functionality. If not nexthdr is handled inline and not compressed. | |
534 | */ | |
535 | ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr, &iphc0); | |
536 | if (ret < 0) | |
537 | return ret; | |
8df8c56a | 538 | |
4710d806 | 539 | /* Hop limit |
8df8c56a JR |
540 | * if 1: compress, encoding is 01 |
541 | * if 64: compress, encoding is 10 | |
542 | * if 255: compress, encoding is 11 | |
543 | * else do not compress | |
544 | */ | |
545 | switch (hdr->hop_limit) { | |
546 | case 1: | |
547 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
548 | break; | |
549 | case 64: | |
550 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
551 | break; | |
552 | case 255: | |
553 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
554 | break; | |
555 | default: | |
85c71240 AA |
556 | lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit, |
557 | sizeof(hdr->hop_limit)); | |
8df8c56a JR |
558 | } |
559 | ||
556a5bfc | 560 | addr_type = ipv6_addr_type(&hdr->saddr); |
8df8c56a | 561 | /* source address compression */ |
556a5bfc | 562 | if (addr_type == IPV6_ADDR_ANY) { |
8df8c56a JR |
563 | pr_debug("source address is unspecified, setting SAC\n"); |
564 | iphc1 |= LOWPAN_IPHC_SAC; | |
8df8c56a | 565 | } else { |
556a5bfc AA |
566 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
567 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, | |
568 | LOWPAN_IPHC_SAM_BIT, | |
a6f77389 | 569 | &hdr->saddr, saddr); |
556a5bfc AA |
570 | pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n", |
571 | &hdr->saddr, iphc1); | |
572 | } else { | |
573 | pr_debug("send the full source address\n"); | |
574 | lowpan_push_hc_data(&hc_ptr, hdr->saddr.s6_addr, 16); | |
575 | } | |
8df8c56a JR |
576 | } |
577 | ||
556a5bfc | 578 | addr_type = ipv6_addr_type(&hdr->daddr); |
8df8c56a | 579 | /* destination address compression */ |
556a5bfc | 580 | if (addr_type & IPV6_ADDR_MULTICAST) { |
8df8c56a JR |
581 | pr_debug("destination address is multicast: "); |
582 | iphc1 |= LOWPAN_IPHC_M; | |
583 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
584 | pr_debug("compressed to 1 octet\n"); | |
585 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
586 | /* use last byte */ | |
85c71240 AA |
587 | lowpan_push_hc_data(&hc_ptr, |
588 | &hdr->daddr.s6_addr[15], 1); | |
8df8c56a JR |
589 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { |
590 | pr_debug("compressed to 4 octets\n"); | |
591 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
592 | /* second byte + the last three */ | |
85c71240 AA |
593 | lowpan_push_hc_data(&hc_ptr, |
594 | &hdr->daddr.s6_addr[1], 1); | |
595 | lowpan_push_hc_data(&hc_ptr, | |
596 | &hdr->daddr.s6_addr[13], 3); | |
8df8c56a JR |
597 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { |
598 | pr_debug("compressed to 6 octets\n"); | |
599 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
600 | /* second byte + the last five */ | |
85c71240 AA |
601 | lowpan_push_hc_data(&hc_ptr, |
602 | &hdr->daddr.s6_addr[1], 1); | |
603 | lowpan_push_hc_data(&hc_ptr, | |
604 | &hdr->daddr.s6_addr[11], 5); | |
8df8c56a JR |
605 | } else { |
606 | pr_debug("using full address\n"); | |
607 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
85c71240 | 608 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
609 | } |
610 | } else { | |
556a5bfc AA |
611 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
612 | /* TODO: context lookup */ | |
84ca5e03 | 613 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
a6f77389 | 614 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); |
8df8c56a | 615 | pr_debug("dest address unicast link-local %pI6c " |
7fc4cfda | 616 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); |
8df8c56a JR |
617 | } else { |
618 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
85c71240 | 619 | lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); |
8df8c56a JR |
620 | } |
621 | } | |
622 | ||
cc6ed268 AA |
623 | /* next header compression */ |
624 | if (iphc0 & LOWPAN_IPHC_NH_C) { | |
625 | ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr); | |
626 | if (ret < 0) | |
627 | return ret; | |
628 | } | |
8df8c56a JR |
629 | |
630 | head[0] = iphc0; | |
631 | head[1] = iphc1; | |
632 | ||
633 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
634 | skb_reset_transport_header(skb); | |
84ca5e03 | 635 | memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); |
8df8c56a JR |
636 | skb_reset_network_header(skb); |
637 | ||
84ca5e03 | 638 | pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); |
8df8c56a JR |
639 | |
640 | raw_dump_table(__func__, "raw skb data dump compressed", | |
4710d806 | 641 | skb->data, skb->len); |
8df8c56a JR |
642 | return 0; |
643 | } | |
644 | EXPORT_SYMBOL_GPL(lowpan_header_compress); |