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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 | ||
6 | /* | |
7 | * Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
8 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
25 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
26 | * All rights reserved. | |
27 | * | |
28 | * Redistribution and use in source and binary forms, with or without | |
29 | * modification, are permitted provided that the following conditions | |
30 | * are met: | |
31 | * 1. Redistributions of source code must retain the above copyright | |
32 | * notice, this list of conditions and the following disclaimer. | |
33 | * 2. Redistributions in binary form must reproduce the above copyright | |
34 | * notice, this list of conditions and the following disclaimer in the | |
35 | * documentation and/or other materials provided with the distribution. | |
36 | * 3. Neither the name of the Institute nor the names of its contributors | |
37 | * may be used to endorse or promote products derived from this software | |
38 | * without specific prior written permission. | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | */ | |
52 | ||
53 | #include <linux/bitops.h> | |
54 | #include <linux/if_arp.h> | |
5ae5e991 | 55 | #include <linux/module.h> |
8df8c56a | 56 | #include <linux/netdevice.h> |
cefc8c8a | 57 | #include <net/6lowpan.h> |
8df8c56a JR |
58 | #include <net/ipv6.h> |
59 | #include <net/af_ieee802154.h> | |
60 | ||
8df8c56a JR |
61 | /* |
62 | * Uncompress address function for source and | |
63 | * destination address(non-multicast). | |
64 | * | |
65 | * address_mode is sam value or dam value. | |
66 | */ | |
67 | static int uncompress_addr(struct sk_buff *skb, | |
68 | struct in6_addr *ipaddr, const u8 address_mode, | |
69 | const u8 *lladdr, const u8 addr_type, | |
70 | const u8 addr_len) | |
71 | { | |
72 | bool fail; | |
73 | ||
74 | switch (address_mode) { | |
75 | case LOWPAN_IPHC_ADDR_00: | |
76 | /* for global link addresses */ | |
77 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
78 | break; | |
79 | case LOWPAN_IPHC_ADDR_01: | |
80 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ | |
81 | ipaddr->s6_addr[0] = 0xFE; | |
82 | ipaddr->s6_addr[1] = 0x80; | |
83 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
84 | break; | |
85 | case LOWPAN_IPHC_ADDR_02: | |
86 | /* fe:80::ff:fe00:XXXX */ | |
87 | ipaddr->s6_addr[0] = 0xFE; | |
88 | ipaddr->s6_addr[1] = 0x80; | |
89 | ipaddr->s6_addr[11] = 0xFF; | |
90 | ipaddr->s6_addr[12] = 0xFE; | |
91 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
92 | break; | |
93 | case LOWPAN_IPHC_ADDR_03: | |
94 | fail = false; | |
95 | switch (addr_type) { | |
96 | case IEEE802154_ADDR_LONG: | |
97 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
98 | * \_________________/ | |
99 | * hwaddr | |
100 | */ | |
101 | ipaddr->s6_addr[0] = 0xFE; | |
102 | ipaddr->s6_addr[1] = 0x80; | |
103 | memcpy(&ipaddr->s6_addr[8], lladdr, addr_len); | |
104 | /* second bit-flip (Universe/Local) | |
105 | * is done according RFC2464 | |
106 | */ | |
107 | ipaddr->s6_addr[8] ^= 0x02; | |
108 | break; | |
109 | case IEEE802154_ADDR_SHORT: | |
110 | /* fe:80::ff:fe00:XXXX | |
111 | * \__/ | |
112 | * short_addr | |
113 | * | |
114 | * Universe/Local bit is zero. | |
115 | */ | |
116 | ipaddr->s6_addr[0] = 0xFE; | |
117 | ipaddr->s6_addr[1] = 0x80; | |
118 | ipaddr->s6_addr[11] = 0xFF; | |
119 | ipaddr->s6_addr[12] = 0xFE; | |
120 | ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr)); | |
121 | break; | |
122 | default: | |
123 | pr_debug("Invalid addr_type set\n"); | |
124 | return -EINVAL; | |
125 | } | |
126 | break; | |
127 | default: | |
128 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | if (fail) { | |
133 | pr_debug("Failed to fetch skb data\n"); | |
134 | return -EIO; | |
135 | } | |
136 | ||
137 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
138 | ipaddr->s6_addr, 16); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * Uncompress address function for source context | |
145 | * based address(non-multicast). | |
146 | */ | |
147 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
148 | struct in6_addr *ipaddr, | |
149 | const u8 sam) | |
150 | { | |
151 | switch (sam) { | |
152 | case LOWPAN_IPHC_ADDR_00: | |
153 | /* unspec address :: | |
154 | * Do nothing, address is already :: | |
155 | */ | |
156 | break; | |
157 | case LOWPAN_IPHC_ADDR_01: | |
158 | /* TODO */ | |
159 | case LOWPAN_IPHC_ADDR_02: | |
160 | /* TODO */ | |
161 | case LOWPAN_IPHC_ADDR_03: | |
162 | /* TODO */ | |
163 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); | |
164 | return -EINVAL; | |
165 | default: | |
166 | pr_debug("Invalid sam value: 0x%x\n", sam); | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | raw_dump_inline(NULL, | |
171 | "Reconstructed context based ipv6 src addr is", | |
172 | ipaddr->s6_addr, 16); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr, | |
178 | struct net_device *dev, skb_delivery_cb deliver_skb) | |
179 | { | |
180 | struct sk_buff *new; | |
181 | int stat; | |
182 | ||
183 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
184 | GFP_ATOMIC); | |
185 | kfree_skb(skb); | |
186 | ||
187 | if (!new) | |
188 | return -ENOMEM; | |
189 | ||
190 | skb_push(new, sizeof(struct ipv6hdr)); | |
191 | skb_reset_network_header(new); | |
192 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
193 | ||
194 | new->protocol = htons(ETH_P_IPV6); | |
195 | new->pkt_type = PACKET_HOST; | |
196 | new->dev = dev; | |
197 | ||
198 | raw_dump_table(__func__, "raw skb data dump before receiving", | |
199 | new->data, new->len); | |
200 | ||
201 | stat = deliver_skb(new, dev); | |
202 | ||
203 | kfree_skb(new); | |
204 | ||
205 | return stat; | |
206 | } | |
207 | ||
208 | /* Uncompress function for multicast destination address, | |
209 | * when M bit is set. | |
210 | */ | |
211 | static int | |
212 | lowpan_uncompress_multicast_daddr(struct sk_buff *skb, | |
213 | struct in6_addr *ipaddr, | |
214 | const u8 dam) | |
215 | { | |
216 | bool fail; | |
217 | ||
218 | switch (dam) { | |
219 | case LOWPAN_IPHC_DAM_00: | |
220 | /* 00: 128 bits. The full address | |
221 | * is carried in-line. | |
222 | */ | |
223 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
224 | break; | |
225 | case LOWPAN_IPHC_DAM_01: | |
226 | /* 01: 48 bits. The address takes | |
227 | * the form ffXX::00XX:XXXX:XXXX. | |
228 | */ | |
229 | ipaddr->s6_addr[0] = 0xFF; | |
230 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
231 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
232 | break; | |
233 | case LOWPAN_IPHC_DAM_10: | |
234 | /* 10: 32 bits. The address takes | |
235 | * the form ffXX::00XX:XXXX. | |
236 | */ | |
237 | ipaddr->s6_addr[0] = 0xFF; | |
238 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
239 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
240 | break; | |
241 | case LOWPAN_IPHC_DAM_11: | |
242 | /* 11: 8 bits. The address takes | |
243 | * the form ff02::00XX. | |
244 | */ | |
245 | ipaddr->s6_addr[0] = 0xFF; | |
246 | ipaddr->s6_addr[1] = 0x02; | |
247 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
248 | break; | |
249 | default: | |
250 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
251 | return -EINVAL; | |
252 | } | |
253 | ||
254 | if (fail) { | |
255 | pr_debug("Failed to fetch skb data\n"); | |
256 | return -EIO; | |
257 | } | |
258 | ||
259 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
260 | ipaddr->s6_addr, 16); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static int | |
266 | uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) | |
267 | { | |
1672a36b AA |
268 | bool fail; |
269 | u8 tmp = 0, val = 0; | |
8df8c56a JR |
270 | |
271 | if (!uh) | |
272 | goto err; | |
273 | ||
8ec1d9be | 274 | fail = lowpan_fetch_skb(skb, &tmp, sizeof(tmp)); |
8df8c56a JR |
275 | |
276 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
277 | pr_debug("UDP header uncompression\n"); | |
278 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { | |
279 | case LOWPAN_NHC_UDP_CS_P_00: | |
8ec1d9be AA |
280 | fail |= lowpan_fetch_skb(skb, &uh->source, |
281 | sizeof(uh->source)); | |
282 | fail |= lowpan_fetch_skb(skb, &uh->dest, | |
283 | sizeof(uh->dest)); | |
8df8c56a JR |
284 | break; |
285 | case LOWPAN_NHC_UDP_CS_P_01: | |
8ec1d9be AA |
286 | fail |= lowpan_fetch_skb(skb, &uh->source, |
287 | sizeof(uh->source)); | |
288 | fail |= lowpan_fetch_skb(skb, &val, sizeof(val)); | |
1672a36b | 289 | uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); |
8df8c56a JR |
290 | break; |
291 | case LOWPAN_NHC_UDP_CS_P_10: | |
8ec1d9be | 292 | fail |= lowpan_fetch_skb(skb, &val, sizeof(val)); |
1672a36b | 293 | uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); |
8ec1d9be AA |
294 | fail |= lowpan_fetch_skb(skb, &uh->dest, |
295 | sizeof(uh->dest)); | |
8df8c56a JR |
296 | break; |
297 | case LOWPAN_NHC_UDP_CS_P_11: | |
8ec1d9be | 298 | fail |= lowpan_fetch_skb(skb, &val, sizeof(val)); |
e5d966ef | 299 | uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 300 | (val >> 4)); |
e5d966ef | 301 | uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 302 | (val & 0x0f)); |
8df8c56a JR |
303 | break; |
304 | default: | |
305 | pr_debug("ERROR: unknown UDP format\n"); | |
306 | goto err; | |
307 | break; | |
308 | } | |
309 | ||
310 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", | |
e5d966ef | 311 | ntohs(uh->source), ntohs(uh->dest)); |
8df8c56a | 312 | |
573701ce AA |
313 | /* checksum */ |
314 | if (tmp & LOWPAN_NHC_UDP_CS_C) { | |
315 | pr_debug_ratelimited("checksum elided currently not supported\n"); | |
316 | goto err; | |
317 | } else { | |
8ec1d9be AA |
318 | fail |= lowpan_fetch_skb(skb, &uh->check, |
319 | sizeof(uh->check)); | |
573701ce | 320 | } |
8df8c56a JR |
321 | |
322 | /* | |
323 | * UDP lenght needs to be infered from the lower layers | |
324 | * here, we obtain the hint from the remaining size of the | |
325 | * frame | |
326 | */ | |
327 | uh->len = htons(skb->len + sizeof(struct udphdr)); | |
e5d966ef | 328 | pr_debug("uncompressed UDP length: src = %d", ntohs(uh->len)); |
8df8c56a JR |
329 | } else { |
330 | pr_debug("ERROR: unsupported NH format\n"); | |
331 | goto err; | |
332 | } | |
333 | ||
1672a36b AA |
334 | if (fail) |
335 | goto err; | |
336 | ||
8df8c56a JR |
337 | return 0; |
338 | err: | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | /* TTL uncompression values */ | |
343 | static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; | |
344 | ||
345 | int lowpan_process_data(struct sk_buff *skb, struct net_device *dev, | |
346 | const u8 *saddr, const u8 saddr_type, const u8 saddr_len, | |
347 | const u8 *daddr, const u8 daddr_type, const u8 daddr_len, | |
348 | u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb) | |
349 | { | |
350 | struct ipv6hdr hdr = {}; | |
351 | u8 tmp, num_context = 0; | |
352 | int err; | |
353 | ||
354 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
355 | skb->data, skb->len); | |
356 | ||
357 | /* another if the CID flag is set */ | |
358 | if (iphc1 & LOWPAN_IPHC_CID) { | |
359 | pr_debug("CID flag is set, increase header with one\n"); | |
4ebc960f | 360 | if (lowpan_fetch_skb(skb, &num_context, sizeof(num_context))) |
8df8c56a JR |
361 | goto drop; |
362 | } | |
363 | ||
364 | hdr.version = 6; | |
365 | ||
366 | /* Traffic Class and Flow Label */ | |
367 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
368 | /* | |
369 | * Traffic Class and FLow Label carried in-line | |
370 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
371 | */ | |
372 | case 0: /* 00b */ | |
4ebc960f | 373 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
8df8c56a JR |
374 | goto drop; |
375 | ||
376 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
377 | skb_pull(skb, 3); | |
378 | hdr.priority = ((tmp >> 2) & 0x0f); | |
379 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
380 | (hdr.flow_lbl[0] & 0x0f); | |
381 | break; | |
382 | /* | |
383 | * Traffic class carried in-line | |
384 | * ECN + DSCP (1 byte), Flow Label is elided | |
385 | */ | |
386 | case 2: /* 10b */ | |
4ebc960f | 387 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
8df8c56a JR |
388 | goto drop; |
389 | ||
390 | hdr.priority = ((tmp >> 2) & 0x0f); | |
391 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
392 | break; | |
393 | /* | |
394 | * Flow Label carried in-line | |
395 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
396 | */ | |
397 | case 1: /* 01b */ | |
4ebc960f | 398 | if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) |
8df8c56a JR |
399 | goto drop; |
400 | ||
401 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); | |
402 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
403 | skb_pull(skb, 2); | |
404 | break; | |
405 | /* Traffic Class and Flow Label are elided */ | |
406 | case 3: /* 11b */ | |
407 | break; | |
408 | default: | |
409 | break; | |
410 | } | |
411 | ||
412 | /* Next Header */ | |
413 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
414 | /* Next header is carried inline */ | |
4ebc960f | 415 | if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) |
8df8c56a JR |
416 | goto drop; |
417 | ||
418 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
419 | hdr.nexthdr); | |
420 | } | |
421 | ||
422 | /* Hop Limit */ | |
423 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
424 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
425 | else { | |
4ebc960f AA |
426 | if (lowpan_fetch_skb(skb, &hdr.hop_limit, |
427 | sizeof(hdr.hop_limit))) | |
8df8c56a JR |
428 | goto drop; |
429 | } | |
430 | ||
431 | /* Extract SAM to the tmp variable */ | |
432 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
433 | ||
434 | if (iphc1 & LOWPAN_IPHC_SAC) { | |
435 | /* Source address context based uncompression */ | |
436 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
437 | err = uncompress_context_based_src_addr( | |
438 | skb, &hdr.saddr, tmp); | |
439 | } else { | |
440 | /* Source address uncompression */ | |
441 | pr_debug("source address stateless compression\n"); | |
442 | err = uncompress_addr(skb, &hdr.saddr, tmp, saddr, | |
443 | saddr_type, saddr_len); | |
444 | } | |
445 | ||
446 | /* Check on error of previous branch */ | |
447 | if (err) | |
448 | goto drop; | |
449 | ||
450 | /* Extract DAM to the tmp variable */ | |
451 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
452 | ||
453 | /* check for Multicast Compression */ | |
454 | if (iphc1 & LOWPAN_IPHC_M) { | |
455 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
456 | pr_debug("dest: context-based mcast compression\n"); | |
457 | /* TODO: implement this */ | |
458 | } else { | |
459 | err = lowpan_uncompress_multicast_daddr( | |
460 | skb, &hdr.daddr, tmp); | |
461 | if (err) | |
462 | goto drop; | |
463 | } | |
464 | } else { | |
465 | err = uncompress_addr(skb, &hdr.daddr, tmp, daddr, | |
466 | daddr_type, daddr_len); | |
467 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", | |
468 | tmp, &hdr.daddr); | |
469 | if (err) | |
470 | goto drop; | |
471 | } | |
472 | ||
473 | /* UDP data uncompression */ | |
474 | if (iphc0 & LOWPAN_IPHC_NH_C) { | |
475 | struct udphdr uh; | |
476 | struct sk_buff *new; | |
477 | if (uncompress_udp_header(skb, &uh)) | |
478 | goto drop; | |
479 | ||
480 | /* | |
481 | * replace the compressed UDP head by the uncompressed UDP | |
482 | * header | |
483 | */ | |
484 | new = skb_copy_expand(skb, sizeof(struct udphdr), | |
485 | skb_tailroom(skb), GFP_ATOMIC); | |
486 | kfree_skb(skb); | |
487 | ||
488 | if (!new) | |
489 | return -ENOMEM; | |
490 | ||
491 | skb = new; | |
492 | ||
493 | skb_push(skb, sizeof(struct udphdr)); | |
494 | skb_reset_transport_header(skb); | |
495 | skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr)); | |
496 | ||
497 | raw_dump_table(__func__, "raw UDP header dump", | |
498 | (u8 *)&uh, sizeof(uh)); | |
499 | ||
500 | hdr.nexthdr = UIP_PROTO_UDP; | |
501 | } | |
502 | ||
503 | hdr.payload_len = htons(skb->len); | |
504 | ||
505 | pr_debug("skb headroom size = %d, data length = %d\n", | |
506 | skb_headroom(skb), skb->len); | |
507 | ||
508 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
509 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
510 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
511 | hdr.hop_limit, &hdr.daddr); | |
512 | ||
513 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
514 | sizeof(hdr)); | |
515 | ||
516 | return skb_deliver(skb, &hdr, dev, deliver_skb); | |
517 | ||
518 | drop: | |
519 | kfree_skb(skb); | |
520 | return -EINVAL; | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(lowpan_process_data); | |
523 | ||
84ca5e03 AA |
524 | static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift, |
525 | const struct in6_addr *ipaddr, | |
526 | const unsigned char *lladdr) | |
8df8c56a JR |
527 | { |
528 | u8 val = 0; | |
529 | ||
530 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
531 | val = 3; /* 0-bits */ | |
532 | pr_debug("address compression 0 bits\n"); | |
533 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
534 | /* compress IID to 16 bits xxxx::XXXX */ | |
84ca5e03 AA |
535 | memcpy(*hc_ptr, &ipaddr->s6_addr16[7], 2); |
536 | *hc_ptr += 2; | |
8df8c56a JR |
537 | val = 2; /* 16-bits */ |
538 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", | |
84ca5e03 | 539 | *hc_ptr - 2, 2); |
8df8c56a JR |
540 | } else { |
541 | /* do not compress IID => xxxx::IID */ | |
84ca5e03 AA |
542 | memcpy(*hc_ptr, &ipaddr->s6_addr16[4], 8); |
543 | *hc_ptr += 8; | |
8df8c56a JR |
544 | val = 1; /* 64-bits */ |
545 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", | |
84ca5e03 | 546 | *hc_ptr - 8, 8); |
8df8c56a JR |
547 | } |
548 | ||
549 | return rol8(val, shift); | |
550 | } | |
551 | ||
84ca5e03 | 552 | static void compress_udp_header(u8 **hc_ptr, struct sk_buff *skb) |
8df8c56a JR |
553 | { |
554 | struct udphdr *uh = udp_hdr(skb); | |
5cede84c | 555 | u8 tmp; |
8df8c56a | 556 | |
e5d966ef AA |
557 | if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) == |
558 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
559 | ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) == | |
560 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
8df8c56a | 561 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
c567c771 | 562 | /* compression value */ |
5cede84c | 563 | tmp = LOWPAN_NHC_UDP_CS_P_11; |
84ca5e03 | 564 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
c567c771 AA |
565 | /* source and destination port */ |
566 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT + | |
567 | ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4); | |
84ca5e03 | 568 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 569 | } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
570 | LOWPAN_NHC_UDP_8BIT_PORT) { |
571 | pr_debug("UDP header: remove 8 bits of dest\n"); | |
c567c771 | 572 | /* compression value */ |
5cede84c | 573 | tmp = LOWPAN_NHC_UDP_CS_P_01; |
84ca5e03 | 574 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
c567c771 | 575 | /* source port */ |
84ca5e03 | 576 | lowpan_push_hc_data(hc_ptr, &uh->source, sizeof(uh->source)); |
c567c771 AA |
577 | /* destination port */ |
578 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT; | |
84ca5e03 | 579 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 580 | } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
581 | LOWPAN_NHC_UDP_8BIT_PORT) { |
582 | pr_debug("UDP header: remove 8 bits of source\n"); | |
c567c771 | 583 | /* compression value */ |
5cede84c | 584 | tmp = LOWPAN_NHC_UDP_CS_P_10; |
84ca5e03 | 585 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
c567c771 AA |
586 | /* source port */ |
587 | tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT; | |
84ca5e03 | 588 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
c567c771 | 589 | /* destination port */ |
84ca5e03 | 590 | lowpan_push_hc_data(hc_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
591 | } else { |
592 | pr_debug("UDP header: can't compress\n"); | |
c567c771 | 593 | /* compression value */ |
5cede84c | 594 | tmp = LOWPAN_NHC_UDP_CS_P_00; |
84ca5e03 | 595 | lowpan_push_hc_data(hc_ptr, &tmp, sizeof(tmp)); |
c567c771 | 596 | /* source port */ |
84ca5e03 | 597 | lowpan_push_hc_data(hc_ptr, &uh->source, sizeof(uh->source)); |
c567c771 | 598 | /* destination port */ |
84ca5e03 | 599 | lowpan_push_hc_data(hc_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
600 | } |
601 | ||
602 | /* checksum is always inline */ | |
84ca5e03 | 603 | lowpan_push_hc_data(hc_ptr, &uh->check, sizeof(uh->check)); |
8df8c56a JR |
604 | |
605 | /* skip the UDP header */ | |
606 | skb_pull(skb, sizeof(struct udphdr)); | |
607 | } | |
608 | ||
609 | int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, | |
610 | unsigned short type, const void *_daddr, | |
611 | const void *_saddr, unsigned int len) | |
612 | { | |
84ca5e03 | 613 | u8 tmp, iphc0, iphc1, *hc_ptr; |
8df8c56a JR |
614 | struct ipv6hdr *hdr; |
615 | u8 head[100] = {}; | |
616 | ||
617 | if (type != ETH_P_IPV6) | |
618 | return -EINVAL; | |
619 | ||
620 | hdr = ipv6_hdr(skb); | |
84ca5e03 | 621 | hc_ptr = head + 2; |
8df8c56a JR |
622 | |
623 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
624 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
625 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, | |
626 | hdr->hop_limit, &hdr->daddr); | |
627 | ||
628 | raw_dump_table(__func__, "raw skb network header dump", | |
629 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
630 | ||
631 | /* | |
632 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
633 | * we sometimes use |= | |
634 | * If the field is 0, and the current bit value in memory is 1, | |
635 | * this does not work. We therefore reset the IPHC encoding here | |
636 | */ | |
637 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
638 | iphc1 = 0; | |
639 | ||
640 | /* TODO: context lookup */ | |
641 | ||
642 | raw_dump_inline(__func__, "saddr", | |
643 | (unsigned char *)_saddr, IEEE802154_ADDR_LEN); | |
644 | raw_dump_inline(__func__, "daddr", | |
645 | (unsigned char *)_daddr, IEEE802154_ADDR_LEN); | |
646 | ||
647 | raw_dump_table(__func__, | |
648 | "sending raw skb network uncompressed packet", | |
649 | skb->data, skb->len); | |
650 | ||
651 | /* | |
652 | * Traffic class, flow label | |
653 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
654 | * We have to process both in the same time as the offset of traffic | |
655 | * class depends on the presence of version and flow label | |
656 | */ | |
657 | ||
84ca5e03 | 658 | /* hc format of TC is ECN | DSCP , original one is DSCP | ECN */ |
8df8c56a JR |
659 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); |
660 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
661 | ||
662 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
663 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
664 | /* flow label can be compressed */ | |
665 | iphc0 |= LOWPAN_IPHC_FL_C; | |
666 | if ((hdr->priority == 0) && | |
667 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
668 | /* compress (elide) all */ | |
669 | iphc0 |= LOWPAN_IPHC_TC_C; | |
670 | } else { | |
671 | /* compress only the flow label */ | |
84ca5e03 AA |
672 | *hc_ptr = tmp; |
673 | hc_ptr += 1; | |
8df8c56a JR |
674 | } |
675 | } else { | |
676 | /* Flow label cannot be compressed */ | |
677 | if ((hdr->priority == 0) && | |
678 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
679 | /* compress only traffic class */ | |
680 | iphc0 |= LOWPAN_IPHC_TC_C; | |
84ca5e03 AA |
681 | *hc_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); |
682 | memcpy(hc_ptr + 1, &hdr->flow_lbl[1], 2); | |
683 | hc_ptr += 3; | |
8df8c56a JR |
684 | } else { |
685 | /* compress nothing */ | |
84ca5e03 | 686 | memcpy(hc_ptr, hdr, 4); |
8df8c56a | 687 | /* replace the top byte with new ECN | DSCP format */ |
84ca5e03 AA |
688 | *hc_ptr = tmp; |
689 | hc_ptr += 4; | |
8df8c56a JR |
690 | } |
691 | } | |
692 | ||
693 | /* NOTE: payload length is always compressed */ | |
694 | ||
695 | /* Next Header is compress if UDP */ | |
696 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
697 | iphc0 |= LOWPAN_IPHC_NH_C; | |
698 | ||
699 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
84ca5e03 AA |
700 | *hc_ptr = hdr->nexthdr; |
701 | hc_ptr += 1; | |
8df8c56a JR |
702 | } |
703 | ||
704 | /* | |
705 | * Hop limit | |
706 | * if 1: compress, encoding is 01 | |
707 | * if 64: compress, encoding is 10 | |
708 | * if 255: compress, encoding is 11 | |
709 | * else do not compress | |
710 | */ | |
711 | switch (hdr->hop_limit) { | |
712 | case 1: | |
713 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
714 | break; | |
715 | case 64: | |
716 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
717 | break; | |
718 | case 255: | |
719 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
720 | break; | |
721 | default: | |
84ca5e03 AA |
722 | *hc_ptr = hdr->hop_limit; |
723 | hc_ptr += 1; | |
8df8c56a JR |
724 | break; |
725 | } | |
726 | ||
727 | /* source address compression */ | |
728 | if (is_addr_unspecified(&hdr->saddr)) { | |
729 | pr_debug("source address is unspecified, setting SAC\n"); | |
730 | iphc1 |= LOWPAN_IPHC_SAC; | |
731 | /* TODO: context lookup */ | |
732 | } else if (is_addr_link_local(&hdr->saddr)) { | |
84ca5e03 | 733 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
8df8c56a JR |
734 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr); |
735 | pr_debug("source address unicast link-local %pI6c " | |
736 | "iphc1 0x%02x\n", &hdr->saddr, iphc1); | |
737 | } else { | |
738 | pr_debug("send the full source address\n"); | |
84ca5e03 AA |
739 | memcpy(hc_ptr, &hdr->saddr.s6_addr16[0], 16); |
740 | hc_ptr += 16; | |
8df8c56a JR |
741 | } |
742 | ||
743 | /* destination address compression */ | |
744 | if (is_addr_mcast(&hdr->daddr)) { | |
745 | pr_debug("destination address is multicast: "); | |
746 | iphc1 |= LOWPAN_IPHC_M; | |
747 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
748 | pr_debug("compressed to 1 octet\n"); | |
749 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
750 | /* use last byte */ | |
84ca5e03 AA |
751 | *hc_ptr = hdr->daddr.s6_addr[15]; |
752 | hc_ptr += 1; | |
8df8c56a JR |
753 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { |
754 | pr_debug("compressed to 4 octets\n"); | |
755 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
756 | /* second byte + the last three */ | |
84ca5e03 AA |
757 | *hc_ptr = hdr->daddr.s6_addr[1]; |
758 | memcpy(hc_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
759 | hc_ptr += 4; | |
8df8c56a JR |
760 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { |
761 | pr_debug("compressed to 6 octets\n"); | |
762 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
763 | /* second byte + the last five */ | |
84ca5e03 AA |
764 | *hc_ptr = hdr->daddr.s6_addr[1]; |
765 | memcpy(hc_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
766 | hc_ptr += 6; | |
8df8c56a JR |
767 | } else { |
768 | pr_debug("using full address\n"); | |
769 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
84ca5e03 AA |
770 | memcpy(hc_ptr, &hdr->daddr.s6_addr[0], 16); |
771 | hc_ptr += 16; | |
8df8c56a JR |
772 | } |
773 | } else { | |
774 | /* TODO: context lookup */ | |
775 | if (is_addr_link_local(&hdr->daddr)) { | |
84ca5e03 | 776 | iphc1 |= lowpan_compress_addr_64(&hc_ptr, |
8df8c56a JR |
777 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr); |
778 | pr_debug("dest address unicast link-local %pI6c " | |
779 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); | |
780 | } else { | |
781 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
84ca5e03 AA |
782 | memcpy(hc_ptr, &hdr->daddr.s6_addr16[0], 16); |
783 | hc_ptr += 16; | |
8df8c56a JR |
784 | } |
785 | } | |
786 | ||
787 | /* UDP header compression */ | |
788 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
84ca5e03 | 789 | compress_udp_header(&hc_ptr, skb); |
8df8c56a JR |
790 | |
791 | head[0] = iphc0; | |
792 | head[1] = iphc1; | |
793 | ||
794 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
795 | skb_reset_transport_header(skb); | |
84ca5e03 | 796 | memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); |
8df8c56a JR |
797 | skb_reset_network_header(skb); |
798 | ||
84ca5e03 | 799 | pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); |
8df8c56a JR |
800 | |
801 | raw_dump_table(__func__, "raw skb data dump compressed", | |
802 | skb->data, skb->len); | |
803 | return 0; | |
804 | } | |
805 | EXPORT_SYMBOL_GPL(lowpan_header_compress); | |
5ae5e991 YD |
806 | |
807 | MODULE_LICENSE("GPL"); |