Commit | Line | Data |
---|---|---|
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 JR |
56 | #include <linux/netdevice.h> |
57 | #include <net/ipv6.h> | |
58 | #include <net/af_ieee802154.h> | |
59 | ||
60 | #include "6lowpan.h" | |
61 | ||
8df8c56a JR |
62 | /* |
63 | * Uncompress address function for source and | |
64 | * destination address(non-multicast). | |
65 | * | |
66 | * address_mode is sam value or dam value. | |
67 | */ | |
68 | static int uncompress_addr(struct sk_buff *skb, | |
69 | struct in6_addr *ipaddr, const u8 address_mode, | |
70 | const u8 *lladdr, const u8 addr_type, | |
71 | const u8 addr_len) | |
72 | { | |
73 | bool fail; | |
74 | ||
75 | switch (address_mode) { | |
76 | case LOWPAN_IPHC_ADDR_00: | |
77 | /* for global link addresses */ | |
78 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
79 | break; | |
80 | case LOWPAN_IPHC_ADDR_01: | |
81 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ | |
82 | ipaddr->s6_addr[0] = 0xFE; | |
83 | ipaddr->s6_addr[1] = 0x80; | |
84 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
85 | break; | |
86 | case LOWPAN_IPHC_ADDR_02: | |
87 | /* fe:80::ff:fe00:XXXX */ | |
88 | ipaddr->s6_addr[0] = 0xFE; | |
89 | ipaddr->s6_addr[1] = 0x80; | |
90 | ipaddr->s6_addr[11] = 0xFF; | |
91 | ipaddr->s6_addr[12] = 0xFE; | |
92 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
93 | break; | |
94 | case LOWPAN_IPHC_ADDR_03: | |
95 | fail = false; | |
96 | switch (addr_type) { | |
97 | case IEEE802154_ADDR_LONG: | |
98 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
99 | * \_________________/ | |
100 | * hwaddr | |
101 | */ | |
102 | ipaddr->s6_addr[0] = 0xFE; | |
103 | ipaddr->s6_addr[1] = 0x80; | |
104 | memcpy(&ipaddr->s6_addr[8], lladdr, addr_len); | |
105 | /* second bit-flip (Universe/Local) | |
106 | * is done according RFC2464 | |
107 | */ | |
108 | ipaddr->s6_addr[8] ^= 0x02; | |
109 | break; | |
110 | case IEEE802154_ADDR_SHORT: | |
111 | /* fe:80::ff:fe00:XXXX | |
112 | * \__/ | |
113 | * short_addr | |
114 | * | |
115 | * Universe/Local bit is zero. | |
116 | */ | |
117 | ipaddr->s6_addr[0] = 0xFE; | |
118 | ipaddr->s6_addr[1] = 0x80; | |
119 | ipaddr->s6_addr[11] = 0xFF; | |
120 | ipaddr->s6_addr[12] = 0xFE; | |
121 | ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr)); | |
122 | break; | |
123 | default: | |
124 | pr_debug("Invalid addr_type set\n"); | |
125 | return -EINVAL; | |
126 | } | |
127 | break; | |
128 | default: | |
129 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
133 | if (fail) { | |
134 | pr_debug("Failed to fetch skb data\n"); | |
135 | return -EIO; | |
136 | } | |
137 | ||
138 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
139 | ipaddr->s6_addr, 16); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Uncompress address function for source context | |
146 | * based address(non-multicast). | |
147 | */ | |
148 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
149 | struct in6_addr *ipaddr, | |
150 | const u8 sam) | |
151 | { | |
152 | switch (sam) { | |
153 | case LOWPAN_IPHC_ADDR_00: | |
154 | /* unspec address :: | |
155 | * Do nothing, address is already :: | |
156 | */ | |
157 | break; | |
158 | case LOWPAN_IPHC_ADDR_01: | |
159 | /* TODO */ | |
160 | case LOWPAN_IPHC_ADDR_02: | |
161 | /* TODO */ | |
162 | case LOWPAN_IPHC_ADDR_03: | |
163 | /* TODO */ | |
164 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); | |
165 | return -EINVAL; | |
166 | default: | |
167 | pr_debug("Invalid sam value: 0x%x\n", sam); | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | raw_dump_inline(NULL, | |
172 | "Reconstructed context based ipv6 src addr is", | |
173 | ipaddr->s6_addr, 16); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr, | |
179 | struct net_device *dev, skb_delivery_cb deliver_skb) | |
180 | { | |
181 | struct sk_buff *new; | |
182 | int stat; | |
183 | ||
184 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), | |
185 | GFP_ATOMIC); | |
186 | kfree_skb(skb); | |
187 | ||
188 | if (!new) | |
189 | return -ENOMEM; | |
190 | ||
191 | skb_push(new, sizeof(struct ipv6hdr)); | |
192 | skb_reset_network_header(new); | |
193 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
194 | ||
195 | new->protocol = htons(ETH_P_IPV6); | |
196 | new->pkt_type = PACKET_HOST; | |
197 | new->dev = dev; | |
198 | ||
199 | raw_dump_table(__func__, "raw skb data dump before receiving", | |
200 | new->data, new->len); | |
201 | ||
202 | stat = deliver_skb(new, dev); | |
203 | ||
204 | kfree_skb(new); | |
205 | ||
206 | return stat; | |
207 | } | |
208 | ||
209 | /* Uncompress function for multicast destination address, | |
210 | * when M bit is set. | |
211 | */ | |
212 | static int | |
213 | lowpan_uncompress_multicast_daddr(struct sk_buff *skb, | |
214 | struct in6_addr *ipaddr, | |
215 | const u8 dam) | |
216 | { | |
217 | bool fail; | |
218 | ||
219 | switch (dam) { | |
220 | case LOWPAN_IPHC_DAM_00: | |
221 | /* 00: 128 bits. The full address | |
222 | * is carried in-line. | |
223 | */ | |
224 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
225 | break; | |
226 | case LOWPAN_IPHC_DAM_01: | |
227 | /* 01: 48 bits. The address takes | |
228 | * the form ffXX::00XX:XXXX:XXXX. | |
229 | */ | |
230 | ipaddr->s6_addr[0] = 0xFF; | |
231 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
232 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
233 | break; | |
234 | case LOWPAN_IPHC_DAM_10: | |
235 | /* 10: 32 bits. The address takes | |
236 | * the form ffXX::00XX:XXXX. | |
237 | */ | |
238 | ipaddr->s6_addr[0] = 0xFF; | |
239 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
240 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
241 | break; | |
242 | case LOWPAN_IPHC_DAM_11: | |
243 | /* 11: 8 bits. The address takes | |
244 | * the form ff02::00XX. | |
245 | */ | |
246 | ipaddr->s6_addr[0] = 0xFF; | |
247 | ipaddr->s6_addr[1] = 0x02; | |
248 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
249 | break; | |
250 | default: | |
251 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
252 | return -EINVAL; | |
253 | } | |
254 | ||
255 | if (fail) { | |
256 | pr_debug("Failed to fetch skb data\n"); | |
257 | return -EIO; | |
258 | } | |
259 | ||
260 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
261 | ipaddr->s6_addr, 16); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int | |
267 | uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) | |
268 | { | |
1672a36b AA |
269 | bool fail; |
270 | u8 tmp = 0, val = 0; | |
8df8c56a JR |
271 | |
272 | if (!uh) | |
273 | goto err; | |
274 | ||
1672a36b | 275 | fail = lowpan_fetch_skb(skb, &tmp, 1); |
8df8c56a JR |
276 | |
277 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
278 | pr_debug("UDP header uncompression\n"); | |
279 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { | |
280 | case LOWPAN_NHC_UDP_CS_P_00: | |
1672a36b AA |
281 | fail |= lowpan_fetch_skb(skb, &uh->source, 2); |
282 | fail |= lowpan_fetch_skb(skb, &uh->dest, 2); | |
8df8c56a JR |
283 | break; |
284 | case LOWPAN_NHC_UDP_CS_P_01: | |
1672a36b AA |
285 | fail |= lowpan_fetch_skb(skb, &uh->source, 2); |
286 | fail |= lowpan_fetch_skb(skb, &val, 1); | |
287 | uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); | |
8df8c56a JR |
288 | break; |
289 | case LOWPAN_NHC_UDP_CS_P_10: | |
1672a36b AA |
290 | fail |= lowpan_fetch_skb(skb, &val, 1); |
291 | uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); | |
292 | fail |= lowpan_fetch_skb(skb, &uh->dest, 2); | |
8df8c56a JR |
293 | break; |
294 | case LOWPAN_NHC_UDP_CS_P_11: | |
1672a36b | 295 | fail |= lowpan_fetch_skb(skb, &val, 1); |
e5d966ef | 296 | uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 297 | (val >> 4)); |
e5d966ef | 298 | uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 299 | (val & 0x0f)); |
8df8c56a JR |
300 | break; |
301 | default: | |
302 | pr_debug("ERROR: unknown UDP format\n"); | |
303 | goto err; | |
304 | break; | |
305 | } | |
306 | ||
307 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", | |
e5d966ef | 308 | ntohs(uh->source), ntohs(uh->dest)); |
8df8c56a | 309 | |
573701ce AA |
310 | /* checksum */ |
311 | if (tmp & LOWPAN_NHC_UDP_CS_C) { | |
312 | pr_debug_ratelimited("checksum elided currently not supported\n"); | |
313 | goto err; | |
314 | } else { | |
1672a36b | 315 | fail |= lowpan_fetch_skb(skb, &uh->check, 2); |
573701ce | 316 | } |
8df8c56a JR |
317 | |
318 | /* | |
319 | * UDP lenght needs to be infered from the lower layers | |
320 | * here, we obtain the hint from the remaining size of the | |
321 | * frame | |
322 | */ | |
323 | uh->len = htons(skb->len + sizeof(struct udphdr)); | |
e5d966ef | 324 | pr_debug("uncompressed UDP length: src = %d", ntohs(uh->len)); |
8df8c56a JR |
325 | } else { |
326 | pr_debug("ERROR: unsupported NH format\n"); | |
327 | goto err; | |
328 | } | |
329 | ||
1672a36b AA |
330 | if (fail) |
331 | goto err; | |
332 | ||
8df8c56a JR |
333 | return 0; |
334 | err: | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | /* TTL uncompression values */ | |
339 | static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; | |
340 | ||
341 | int lowpan_process_data(struct sk_buff *skb, struct net_device *dev, | |
342 | const u8 *saddr, const u8 saddr_type, const u8 saddr_len, | |
343 | const u8 *daddr, const u8 daddr_type, const u8 daddr_len, | |
344 | u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb) | |
345 | { | |
346 | struct ipv6hdr hdr = {}; | |
347 | u8 tmp, num_context = 0; | |
348 | int err; | |
349 | ||
350 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
351 | skb->data, skb->len); | |
352 | ||
353 | /* another if the CID flag is set */ | |
354 | if (iphc1 & LOWPAN_IPHC_CID) { | |
355 | pr_debug("CID flag is set, increase header with one\n"); | |
356 | if (lowpan_fetch_skb_u8(skb, &num_context)) | |
357 | goto drop; | |
358 | } | |
359 | ||
360 | hdr.version = 6; | |
361 | ||
362 | /* Traffic Class and Flow Label */ | |
363 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
364 | /* | |
365 | * Traffic Class and FLow Label carried in-line | |
366 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) | |
367 | */ | |
368 | case 0: /* 00b */ | |
369 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
370 | goto drop; | |
371 | ||
372 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
373 | skb_pull(skb, 3); | |
374 | hdr.priority = ((tmp >> 2) & 0x0f); | |
375 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
376 | (hdr.flow_lbl[0] & 0x0f); | |
377 | break; | |
378 | /* | |
379 | * Traffic class carried in-line | |
380 | * ECN + DSCP (1 byte), Flow Label is elided | |
381 | */ | |
382 | case 2: /* 10b */ | |
383 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
384 | goto drop; | |
385 | ||
386 | hdr.priority = ((tmp >> 2) & 0x0f); | |
387 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
388 | break; | |
389 | /* | |
390 | * Flow Label carried in-line | |
391 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided | |
392 | */ | |
393 | case 1: /* 01b */ | |
394 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
395 | goto drop; | |
396 | ||
397 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); | |
398 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
399 | skb_pull(skb, 2); | |
400 | break; | |
401 | /* Traffic Class and Flow Label are elided */ | |
402 | case 3: /* 11b */ | |
403 | break; | |
404 | default: | |
405 | break; | |
406 | } | |
407 | ||
408 | /* Next Header */ | |
409 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
410 | /* Next header is carried inline */ | |
411 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) | |
412 | goto drop; | |
413 | ||
414 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
415 | hdr.nexthdr); | |
416 | } | |
417 | ||
418 | /* Hop Limit */ | |
419 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) | |
420 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; | |
421 | else { | |
422 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) | |
423 | goto drop; | |
424 | } | |
425 | ||
426 | /* Extract SAM to the tmp variable */ | |
427 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
428 | ||
429 | if (iphc1 & LOWPAN_IPHC_SAC) { | |
430 | /* Source address context based uncompression */ | |
431 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
432 | err = uncompress_context_based_src_addr( | |
433 | skb, &hdr.saddr, tmp); | |
434 | } else { | |
435 | /* Source address uncompression */ | |
436 | pr_debug("source address stateless compression\n"); | |
437 | err = uncompress_addr(skb, &hdr.saddr, tmp, saddr, | |
438 | saddr_type, saddr_len); | |
439 | } | |
440 | ||
441 | /* Check on error of previous branch */ | |
442 | if (err) | |
443 | goto drop; | |
444 | ||
445 | /* Extract DAM to the tmp variable */ | |
446 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
447 | ||
448 | /* check for Multicast Compression */ | |
449 | if (iphc1 & LOWPAN_IPHC_M) { | |
450 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
451 | pr_debug("dest: context-based mcast compression\n"); | |
452 | /* TODO: implement this */ | |
453 | } else { | |
454 | err = lowpan_uncompress_multicast_daddr( | |
455 | skb, &hdr.daddr, tmp); | |
456 | if (err) | |
457 | goto drop; | |
458 | } | |
459 | } else { | |
460 | err = uncompress_addr(skb, &hdr.daddr, tmp, daddr, | |
461 | daddr_type, daddr_len); | |
462 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", | |
463 | tmp, &hdr.daddr); | |
464 | if (err) | |
465 | goto drop; | |
466 | } | |
467 | ||
468 | /* UDP data uncompression */ | |
469 | if (iphc0 & LOWPAN_IPHC_NH_C) { | |
470 | struct udphdr uh; | |
471 | struct sk_buff *new; | |
472 | if (uncompress_udp_header(skb, &uh)) | |
473 | goto drop; | |
474 | ||
475 | /* | |
476 | * replace the compressed UDP head by the uncompressed UDP | |
477 | * header | |
478 | */ | |
479 | new = skb_copy_expand(skb, sizeof(struct udphdr), | |
480 | skb_tailroom(skb), GFP_ATOMIC); | |
481 | kfree_skb(skb); | |
482 | ||
483 | if (!new) | |
484 | return -ENOMEM; | |
485 | ||
486 | skb = new; | |
487 | ||
488 | skb_push(skb, sizeof(struct udphdr)); | |
489 | skb_reset_transport_header(skb); | |
490 | skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr)); | |
491 | ||
492 | raw_dump_table(__func__, "raw UDP header dump", | |
493 | (u8 *)&uh, sizeof(uh)); | |
494 | ||
495 | hdr.nexthdr = UIP_PROTO_UDP; | |
496 | } | |
497 | ||
498 | hdr.payload_len = htons(skb->len); | |
499 | ||
500 | pr_debug("skb headroom size = %d, data length = %d\n", | |
501 | skb_headroom(skb), skb->len); | |
502 | ||
503 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
504 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
505 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
506 | hdr.hop_limit, &hdr.daddr); | |
507 | ||
508 | raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, | |
509 | sizeof(hdr)); | |
510 | ||
511 | return skb_deliver(skb, &hdr, dev, deliver_skb); | |
512 | ||
513 | drop: | |
514 | kfree_skb(skb); | |
515 | return -EINVAL; | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(lowpan_process_data); | |
518 | ||
519 | static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, | |
520 | const struct in6_addr *ipaddr, | |
521 | const unsigned char *lladdr) | |
522 | { | |
523 | u8 val = 0; | |
524 | ||
525 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
526 | val = 3; /* 0-bits */ | |
527 | pr_debug("address compression 0 bits\n"); | |
528 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
529 | /* compress IID to 16 bits xxxx::XXXX */ | |
530 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
531 | *hc06_ptr += 2; | |
532 | val = 2; /* 16-bits */ | |
533 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", | |
534 | *hc06_ptr - 2, 2); | |
535 | } else { | |
536 | /* do not compress IID => xxxx::IID */ | |
537 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
538 | *hc06_ptr += 8; | |
539 | val = 1; /* 64-bits */ | |
540 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", | |
541 | *hc06_ptr - 8, 8); | |
542 | } | |
543 | ||
544 | return rol8(val, shift); | |
545 | } | |
546 | ||
547 | static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
548 | { | |
549 | struct udphdr *uh = udp_hdr(skb); | |
5cede84c | 550 | u8 tmp; |
8df8c56a | 551 | |
e5d966ef AA |
552 | if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) == |
553 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
554 | ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) == | |
555 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
8df8c56a | 556 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
c567c771 | 557 | /* compression value */ |
5cede84c AA |
558 | tmp = LOWPAN_NHC_UDP_CS_P_11; |
559 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 AA |
560 | /* source and destination port */ |
561 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT + | |
562 | ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4); | |
5cede84c | 563 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 564 | } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
565 | LOWPAN_NHC_UDP_8BIT_PORT) { |
566 | pr_debug("UDP header: remove 8 bits of dest\n"); | |
c567c771 | 567 | /* compression value */ |
5cede84c AA |
568 | tmp = LOWPAN_NHC_UDP_CS_P_01; |
569 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 | 570 | /* source port */ |
5cede84c | 571 | lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); |
c567c771 AA |
572 | /* destination port */ |
573 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT; | |
5cede84c | 574 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 575 | } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
576 | LOWPAN_NHC_UDP_8BIT_PORT) { |
577 | pr_debug("UDP header: remove 8 bits of source\n"); | |
c567c771 | 578 | /* compression value */ |
5cede84c AA |
579 | tmp = LOWPAN_NHC_UDP_CS_P_10; |
580 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 AA |
581 | /* source port */ |
582 | tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT; | |
5cede84c | 583 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
c567c771 | 584 | /* destination port */ |
95277eb1 | 585 | lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
586 | } else { |
587 | pr_debug("UDP header: can't compress\n"); | |
c567c771 | 588 | /* compression value */ |
5cede84c AA |
589 | tmp = LOWPAN_NHC_UDP_CS_P_00; |
590 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 | 591 | /* source port */ |
5cede84c | 592 | lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); |
c567c771 | 593 | /* destination port */ |
5cede84c | 594 | lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
595 | } |
596 | ||
597 | /* checksum is always inline */ | |
5cede84c | 598 | lowpan_push_hc_data(hc06_ptr, &uh->check, sizeof(uh->check)); |
8df8c56a JR |
599 | |
600 | /* skip the UDP header */ | |
601 | skb_pull(skb, sizeof(struct udphdr)); | |
602 | } | |
603 | ||
604 | int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, | |
605 | unsigned short type, const void *_daddr, | |
606 | const void *_saddr, unsigned int len) | |
607 | { | |
608 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
609 | struct ipv6hdr *hdr; | |
610 | u8 head[100] = {}; | |
611 | ||
612 | if (type != ETH_P_IPV6) | |
613 | return -EINVAL; | |
614 | ||
615 | hdr = ipv6_hdr(skb); | |
616 | hc06_ptr = head + 2; | |
617 | ||
618 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
619 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
620 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, | |
621 | hdr->hop_limit, &hdr->daddr); | |
622 | ||
623 | raw_dump_table(__func__, "raw skb network header dump", | |
624 | skb_network_header(skb), sizeof(struct ipv6hdr)); | |
625 | ||
626 | /* | |
627 | * As we copy some bit-length fields, in the IPHC encoding bytes, | |
628 | * we sometimes use |= | |
629 | * If the field is 0, and the current bit value in memory is 1, | |
630 | * this does not work. We therefore reset the IPHC encoding here | |
631 | */ | |
632 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
633 | iphc1 = 0; | |
634 | ||
635 | /* TODO: context lookup */ | |
636 | ||
637 | raw_dump_inline(__func__, "saddr", | |
638 | (unsigned char *)_saddr, IEEE802154_ADDR_LEN); | |
639 | raw_dump_inline(__func__, "daddr", | |
640 | (unsigned char *)_daddr, IEEE802154_ADDR_LEN); | |
641 | ||
642 | raw_dump_table(__func__, | |
643 | "sending raw skb network uncompressed packet", | |
644 | skb->data, skb->len); | |
645 | ||
646 | /* | |
647 | * Traffic class, flow label | |
648 | * If flow label is 0, compress it. If traffic class is 0, compress it | |
649 | * We have to process both in the same time as the offset of traffic | |
650 | * class depends on the presence of version and flow label | |
651 | */ | |
652 | ||
653 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
654 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
655 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
656 | ||
657 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
658 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { | |
659 | /* flow label can be compressed */ | |
660 | iphc0 |= LOWPAN_IPHC_FL_C; | |
661 | if ((hdr->priority == 0) && | |
662 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
663 | /* compress (elide) all */ | |
664 | iphc0 |= LOWPAN_IPHC_TC_C; | |
665 | } else { | |
666 | /* compress only the flow label */ | |
667 | *hc06_ptr = tmp; | |
668 | hc06_ptr += 1; | |
669 | } | |
670 | } else { | |
671 | /* Flow label cannot be compressed */ | |
672 | if ((hdr->priority == 0) && | |
673 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { | |
674 | /* compress only traffic class */ | |
675 | iphc0 |= LOWPAN_IPHC_TC_C; | |
676 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
677 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
678 | hc06_ptr += 3; | |
679 | } else { | |
680 | /* compress nothing */ | |
681 | memcpy(hc06_ptr, &hdr, 4); | |
682 | /* replace the top byte with new ECN | DSCP format */ | |
683 | *hc06_ptr = tmp; | |
684 | hc06_ptr += 4; | |
685 | } | |
686 | } | |
687 | ||
688 | /* NOTE: payload length is always compressed */ | |
689 | ||
690 | /* Next Header is compress if UDP */ | |
691 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
692 | iphc0 |= LOWPAN_IPHC_NH_C; | |
693 | ||
694 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
695 | *hc06_ptr = hdr->nexthdr; | |
696 | hc06_ptr += 1; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Hop limit | |
701 | * if 1: compress, encoding is 01 | |
702 | * if 64: compress, encoding is 10 | |
703 | * if 255: compress, encoding is 11 | |
704 | * else do not compress | |
705 | */ | |
706 | switch (hdr->hop_limit) { | |
707 | case 1: | |
708 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
709 | break; | |
710 | case 64: | |
711 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
712 | break; | |
713 | case 255: | |
714 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
715 | break; | |
716 | default: | |
717 | *hc06_ptr = hdr->hop_limit; | |
718 | hc06_ptr += 1; | |
719 | break; | |
720 | } | |
721 | ||
722 | /* source address compression */ | |
723 | if (is_addr_unspecified(&hdr->saddr)) { | |
724 | pr_debug("source address is unspecified, setting SAC\n"); | |
725 | iphc1 |= LOWPAN_IPHC_SAC; | |
726 | /* TODO: context lookup */ | |
727 | } else if (is_addr_link_local(&hdr->saddr)) { | |
728 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
729 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr); | |
730 | pr_debug("source address unicast link-local %pI6c " | |
731 | "iphc1 0x%02x\n", &hdr->saddr, iphc1); | |
732 | } else { | |
733 | pr_debug("send the full source address\n"); | |
734 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); | |
735 | hc06_ptr += 16; | |
736 | } | |
737 | ||
738 | /* destination address compression */ | |
739 | if (is_addr_mcast(&hdr->daddr)) { | |
740 | pr_debug("destination address is multicast: "); | |
741 | iphc1 |= LOWPAN_IPHC_M; | |
742 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
743 | pr_debug("compressed to 1 octet\n"); | |
744 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
745 | /* use last byte */ | |
746 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
747 | hc06_ptr += 1; | |
748 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
749 | pr_debug("compressed to 4 octets\n"); | |
750 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
751 | /* second byte + the last three */ | |
752 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
753 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
754 | hc06_ptr += 4; | |
755 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
756 | pr_debug("compressed to 6 octets\n"); | |
757 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
758 | /* second byte + the last five */ | |
759 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
760 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
761 | hc06_ptr += 6; | |
762 | } else { | |
763 | pr_debug("using full address\n"); | |
764 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
765 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
766 | hc06_ptr += 16; | |
767 | } | |
768 | } else { | |
769 | /* TODO: context lookup */ | |
770 | if (is_addr_link_local(&hdr->daddr)) { | |
771 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
772 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr); | |
773 | pr_debug("dest address unicast link-local %pI6c " | |
774 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); | |
775 | } else { | |
776 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
777 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); | |
778 | hc06_ptr += 16; | |
779 | } | |
780 | } | |
781 | ||
782 | /* UDP header compression */ | |
783 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
784 | compress_udp_header(&hc06_ptr, skb); | |
785 | ||
786 | head[0] = iphc0; | |
787 | head[1] = iphc1; | |
788 | ||
789 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
790 | skb_reset_transport_header(skb); | |
791 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
792 | skb_reset_network_header(skb); | |
793 | ||
794 | pr_debug("header len %d skb %u\n", (int)(hc06_ptr - head), skb->len); | |
795 | ||
796 | raw_dump_table(__func__, "raw skb data dump compressed", | |
797 | skb->data, skb->len); | |
798 | return 0; | |
799 | } | |
800 | EXPORT_SYMBOL_GPL(lowpan_header_compress); | |
5ae5e991 YD |
801 | |
802 | MODULE_LICENSE("GPL"); |