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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 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | ||
23 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
24 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
25 | * All rights reserved. | |
26 | * | |
27 | * Redistribution and use in source and binary forms, with or without | |
28 | * modification, are permitted provided that the following conditions | |
29 | * are met: | |
30 | * 1. Redistributions of source code must retain the above copyright | |
31 | * notice, this list of conditions and the following disclaimer. | |
32 | * 2. Redistributions in binary form must reproduce the above copyright | |
33 | * notice, this list of conditions and the following disclaimer in the | |
34 | * documentation and/or other materials provided with the distribution. | |
35 | * 3. Neither the name of the Institute nor the names of its contributors | |
36 | * may be used to endorse or promote products derived from this software | |
37 | * without specific prior written permission. | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
40 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
42 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
43 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
44 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
45 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
47 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
48 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
49 | * SUCH DAMAGE. | |
50 | */ | |
51 | ||
52 | #include <linux/bitops.h> | |
53 | #include <linux/if_arp.h> | |
5ae5e991 | 54 | #include <linux/module.h> |
8df8c56a | 55 | #include <linux/netdevice.h> |
cefc8c8a | 56 | #include <net/6lowpan.h> |
8df8c56a JR |
57 | #include <net/ipv6.h> |
58 | #include <net/af_ieee802154.h> | |
59 | ||
4710d806 | 60 | /* Uncompress address function for source and |
8df8c56a JR |
61 | * destination address(non-multicast). |
62 | * | |
63 | * address_mode is sam value or dam value. | |
64 | */ | |
65 | static int uncompress_addr(struct sk_buff *skb, | |
4710d806 VB |
66 | struct in6_addr *ipaddr, const u8 address_mode, |
67 | const u8 *lladdr, const u8 addr_type, | |
68 | const u8 addr_len) | |
8df8c56a JR |
69 | { |
70 | bool fail; | |
71 | ||
72 | switch (address_mode) { | |
73 | case LOWPAN_IPHC_ADDR_00: | |
74 | /* for global link addresses */ | |
75 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
76 | break; | |
77 | case LOWPAN_IPHC_ADDR_01: | |
78 | /* fe:80::XXXX:XXXX:XXXX:XXXX */ | |
79 | ipaddr->s6_addr[0] = 0xFE; | |
80 | ipaddr->s6_addr[1] = 0x80; | |
81 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); | |
82 | break; | |
83 | case LOWPAN_IPHC_ADDR_02: | |
84 | /* fe:80::ff:fe00:XXXX */ | |
85 | ipaddr->s6_addr[0] = 0xFE; | |
86 | ipaddr->s6_addr[1] = 0x80; | |
87 | ipaddr->s6_addr[11] = 0xFF; | |
88 | ipaddr->s6_addr[12] = 0xFE; | |
89 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); | |
90 | break; | |
91 | case LOWPAN_IPHC_ADDR_03: | |
92 | fail = false; | |
93 | switch (addr_type) { | |
94 | case IEEE802154_ADDR_LONG: | |
95 | /* fe:80::XXXX:XXXX:XXXX:XXXX | |
96 | * \_________________/ | |
97 | * hwaddr | |
98 | */ | |
99 | ipaddr->s6_addr[0] = 0xFE; | |
100 | ipaddr->s6_addr[1] = 0x80; | |
101 | memcpy(&ipaddr->s6_addr[8], lladdr, addr_len); | |
102 | /* second bit-flip (Universe/Local) | |
103 | * is done according RFC2464 | |
104 | */ | |
105 | ipaddr->s6_addr[8] ^= 0x02; | |
106 | break; | |
107 | case IEEE802154_ADDR_SHORT: | |
108 | /* fe:80::ff:fe00:XXXX | |
109 | * \__/ | |
110 | * short_addr | |
111 | * | |
112 | * Universe/Local bit is zero. | |
113 | */ | |
114 | ipaddr->s6_addr[0] = 0xFE; | |
115 | ipaddr->s6_addr[1] = 0x80; | |
116 | ipaddr->s6_addr[11] = 0xFF; | |
117 | ipaddr->s6_addr[12] = 0xFE; | |
118 | ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr)); | |
119 | break; | |
120 | default: | |
121 | pr_debug("Invalid addr_type set\n"); | |
122 | return -EINVAL; | |
123 | } | |
124 | break; | |
125 | default: | |
126 | pr_debug("Invalid address mode value: 0x%x\n", address_mode); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | if (fail) { | |
131 | pr_debug("Failed to fetch skb data\n"); | |
132 | return -EIO; | |
133 | } | |
134 | ||
135 | raw_dump_inline(NULL, "Reconstructed ipv6 addr is", | |
136 | ipaddr->s6_addr, 16); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
4710d806 | 141 | /* Uncompress address function for source context |
8df8c56a JR |
142 | * based address(non-multicast). |
143 | */ | |
144 | static int uncompress_context_based_src_addr(struct sk_buff *skb, | |
4710d806 VB |
145 | struct in6_addr *ipaddr, |
146 | const u8 sam) | |
8df8c56a JR |
147 | { |
148 | switch (sam) { | |
149 | case LOWPAN_IPHC_ADDR_00: | |
150 | /* unspec address :: | |
151 | * Do nothing, address is already :: | |
152 | */ | |
153 | break; | |
154 | case LOWPAN_IPHC_ADDR_01: | |
155 | /* TODO */ | |
156 | case LOWPAN_IPHC_ADDR_02: | |
157 | /* TODO */ | |
158 | case LOWPAN_IPHC_ADDR_03: | |
159 | /* TODO */ | |
160 | netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); | |
161 | return -EINVAL; | |
162 | default: | |
163 | pr_debug("Invalid sam value: 0x%x\n", sam); | |
164 | return -EINVAL; | |
165 | } | |
166 | ||
167 | raw_dump_inline(NULL, | |
168 | "Reconstructed context based ipv6 src addr is", | |
169 | ipaddr->s6_addr, 16); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr, | |
4710d806 | 175 | struct net_device *dev, skb_delivery_cb deliver_skb) |
8df8c56a JR |
176 | { |
177 | struct sk_buff *new; | |
178 | int stat; | |
179 | ||
4710d806 VB |
180 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), |
181 | skb_tailroom(skb), GFP_ATOMIC); | |
8df8c56a JR |
182 | kfree_skb(skb); |
183 | ||
184 | if (!new) | |
185 | return -ENOMEM; | |
186 | ||
187 | skb_push(new, sizeof(struct ipv6hdr)); | |
188 | skb_reset_network_header(new); | |
189 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); | |
190 | ||
191 | new->protocol = htons(ETH_P_IPV6); | |
192 | new->pkt_type = PACKET_HOST; | |
193 | new->dev = dev; | |
194 | ||
195 | raw_dump_table(__func__, "raw skb data dump before receiving", | |
4710d806 | 196 | new->data, new->len); |
8df8c56a JR |
197 | |
198 | stat = deliver_skb(new, dev); | |
199 | ||
200 | kfree_skb(new); | |
201 | ||
202 | return stat; | |
203 | } | |
204 | ||
205 | /* Uncompress function for multicast destination address, | |
206 | * when M bit is set. | |
207 | */ | |
208 | static int | |
209 | lowpan_uncompress_multicast_daddr(struct sk_buff *skb, | |
4710d806 VB |
210 | struct in6_addr *ipaddr, |
211 | const u8 dam) | |
8df8c56a JR |
212 | { |
213 | bool fail; | |
214 | ||
215 | switch (dam) { | |
216 | case LOWPAN_IPHC_DAM_00: | |
217 | /* 00: 128 bits. The full address | |
218 | * is carried in-line. | |
219 | */ | |
220 | fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); | |
221 | break; | |
222 | case LOWPAN_IPHC_DAM_01: | |
223 | /* 01: 48 bits. The address takes | |
224 | * the form ffXX::00XX:XXXX:XXXX. | |
225 | */ | |
226 | ipaddr->s6_addr[0] = 0xFF; | |
227 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
228 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); | |
229 | break; | |
230 | case LOWPAN_IPHC_DAM_10: | |
231 | /* 10: 32 bits. The address takes | |
232 | * the form ffXX::00XX:XXXX. | |
233 | */ | |
234 | ipaddr->s6_addr[0] = 0xFF; | |
235 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); | |
236 | fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); | |
237 | break; | |
238 | case LOWPAN_IPHC_DAM_11: | |
239 | /* 11: 8 bits. The address takes | |
240 | * the form ff02::00XX. | |
241 | */ | |
242 | ipaddr->s6_addr[0] = 0xFF; | |
243 | ipaddr->s6_addr[1] = 0x02; | |
244 | fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); | |
245 | break; | |
246 | default: | |
247 | pr_debug("DAM value has a wrong value: 0x%x\n", dam); | |
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | if (fail) { | |
252 | pr_debug("Failed to fetch skb data\n"); | |
253 | return -EIO; | |
254 | } | |
255 | ||
256 | raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", | |
257 | ipaddr->s6_addr, 16); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static int | |
263 | uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh) | |
264 | { | |
1672a36b AA |
265 | bool fail; |
266 | u8 tmp = 0, val = 0; | |
8df8c56a JR |
267 | |
268 | if (!uh) | |
269 | goto err; | |
270 | ||
1672a36b | 271 | fail = lowpan_fetch_skb(skb, &tmp, 1); |
8df8c56a JR |
272 | |
273 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { | |
274 | pr_debug("UDP header uncompression\n"); | |
275 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { | |
276 | case LOWPAN_NHC_UDP_CS_P_00: | |
1672a36b AA |
277 | fail |= lowpan_fetch_skb(skb, &uh->source, 2); |
278 | fail |= lowpan_fetch_skb(skb, &uh->dest, 2); | |
8df8c56a JR |
279 | break; |
280 | case LOWPAN_NHC_UDP_CS_P_01: | |
1672a36b AA |
281 | fail |= lowpan_fetch_skb(skb, &uh->source, 2); |
282 | fail |= lowpan_fetch_skb(skb, &val, 1); | |
283 | uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); | |
8df8c56a JR |
284 | break; |
285 | case LOWPAN_NHC_UDP_CS_P_10: | |
1672a36b AA |
286 | fail |= lowpan_fetch_skb(skb, &val, 1); |
287 | uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT); | |
288 | fail |= lowpan_fetch_skb(skb, &uh->dest, 2); | |
8df8c56a JR |
289 | break; |
290 | case LOWPAN_NHC_UDP_CS_P_11: | |
1672a36b | 291 | fail |= lowpan_fetch_skb(skb, &val, 1); |
e5d966ef | 292 | uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 293 | (val >> 4)); |
e5d966ef | 294 | uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT + |
1672a36b | 295 | (val & 0x0f)); |
8df8c56a JR |
296 | break; |
297 | default: | |
298 | pr_debug("ERROR: unknown UDP format\n"); | |
299 | goto err; | |
300 | break; | |
301 | } | |
302 | ||
303 | pr_debug("uncompressed UDP ports: src = %d, dst = %d\n", | |
e5d966ef | 304 | ntohs(uh->source), ntohs(uh->dest)); |
8df8c56a | 305 | |
573701ce AA |
306 | /* checksum */ |
307 | if (tmp & LOWPAN_NHC_UDP_CS_C) { | |
308 | pr_debug_ratelimited("checksum elided currently not supported\n"); | |
309 | goto err; | |
310 | } else { | |
1672a36b | 311 | fail |= lowpan_fetch_skb(skb, &uh->check, 2); |
573701ce | 312 | } |
8df8c56a | 313 | |
4710d806 | 314 | /* UDP lenght needs to be infered from the lower layers |
8df8c56a JR |
315 | * here, we obtain the hint from the remaining size of the |
316 | * frame | |
317 | */ | |
318 | uh->len = htons(skb->len + sizeof(struct udphdr)); | |
e5d966ef | 319 | pr_debug("uncompressed UDP length: src = %d", ntohs(uh->len)); |
8df8c56a JR |
320 | } else { |
321 | pr_debug("ERROR: unsupported NH format\n"); | |
322 | goto err; | |
323 | } | |
324 | ||
1672a36b AA |
325 | if (fail) |
326 | goto err; | |
327 | ||
8df8c56a JR |
328 | return 0; |
329 | err: | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | /* TTL uncompression values */ | |
334 | static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; | |
335 | ||
336 | int lowpan_process_data(struct sk_buff *skb, struct net_device *dev, | |
4710d806 VB |
337 | const u8 *saddr, const u8 saddr_type, |
338 | const u8 saddr_len, const u8 *daddr, | |
339 | const u8 daddr_type, const u8 daddr_len, | |
340 | u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb) | |
8df8c56a JR |
341 | { |
342 | struct ipv6hdr hdr = {}; | |
343 | u8 tmp, num_context = 0; | |
344 | int err; | |
345 | ||
346 | raw_dump_table(__func__, "raw skb data dump uncompressed", | |
4710d806 | 347 | skb->data, skb->len); |
8df8c56a JR |
348 | |
349 | /* another if the CID flag is set */ | |
350 | if (iphc1 & LOWPAN_IPHC_CID) { | |
351 | pr_debug("CID flag is set, increase header with one\n"); | |
352 | if (lowpan_fetch_skb_u8(skb, &num_context)) | |
353 | goto drop; | |
354 | } | |
355 | ||
356 | hdr.version = 6; | |
357 | ||
358 | /* Traffic Class and Flow Label */ | |
359 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { | |
4710d806 | 360 | /* Traffic Class and FLow Label carried in-line |
8df8c56a JR |
361 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) |
362 | */ | |
363 | case 0: /* 00b */ | |
364 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
365 | goto drop; | |
366 | ||
367 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); | |
368 | skb_pull(skb, 3); | |
369 | hdr.priority = ((tmp >> 2) & 0x0f); | |
370 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | | |
371 | (hdr.flow_lbl[0] & 0x0f); | |
372 | break; | |
4710d806 | 373 | /* Traffic class carried in-line |
8df8c56a JR |
374 | * ECN + DSCP (1 byte), Flow Label is elided |
375 | */ | |
376 | case 2: /* 10b */ | |
377 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
378 | goto drop; | |
379 | ||
380 | hdr.priority = ((tmp >> 2) & 0x0f); | |
381 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); | |
382 | break; | |
4710d806 | 383 | /* Flow Label carried in-line |
8df8c56a JR |
384 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided |
385 | */ | |
386 | case 1: /* 01b */ | |
387 | if (lowpan_fetch_skb_u8(skb, &tmp)) | |
388 | goto drop; | |
389 | ||
390 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); | |
391 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); | |
392 | skb_pull(skb, 2); | |
393 | break; | |
394 | /* Traffic Class and Flow Label are elided */ | |
395 | case 3: /* 11b */ | |
396 | break; | |
397 | default: | |
398 | break; | |
399 | } | |
400 | ||
401 | /* Next Header */ | |
402 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
403 | /* Next header is carried inline */ | |
404 | if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr))) | |
405 | goto drop; | |
406 | ||
407 | pr_debug("NH flag is set, next header carried inline: %02x\n", | |
408 | hdr.nexthdr); | |
409 | } | |
410 | ||
411 | /* Hop Limit */ | |
4710d806 | 412 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) { |
8df8c56a | 413 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; |
4710d806 | 414 | } else { |
8df8c56a JR |
415 | if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit))) |
416 | goto drop; | |
417 | } | |
418 | ||
419 | /* Extract SAM to the tmp variable */ | |
420 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; | |
421 | ||
422 | if (iphc1 & LOWPAN_IPHC_SAC) { | |
423 | /* Source address context based uncompression */ | |
424 | pr_debug("SAC bit is set. Handle context based source address.\n"); | |
425 | err = uncompress_context_based_src_addr( | |
4710d806 | 426 | skb, &hdr.saddr, tmp); |
8df8c56a JR |
427 | } else { |
428 | /* Source address uncompression */ | |
429 | pr_debug("source address stateless compression\n"); | |
430 | err = uncompress_addr(skb, &hdr.saddr, tmp, saddr, | |
4710d806 | 431 | saddr_type, saddr_len); |
8df8c56a JR |
432 | } |
433 | ||
434 | /* Check on error of previous branch */ | |
435 | if (err) | |
436 | goto drop; | |
437 | ||
438 | /* Extract DAM to the tmp variable */ | |
439 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; | |
440 | ||
441 | /* check for Multicast Compression */ | |
442 | if (iphc1 & LOWPAN_IPHC_M) { | |
443 | if (iphc1 & LOWPAN_IPHC_DAC) { | |
444 | pr_debug("dest: context-based mcast compression\n"); | |
445 | /* TODO: implement this */ | |
446 | } else { | |
447 | err = lowpan_uncompress_multicast_daddr( | |
448 | skb, &hdr.daddr, tmp); | |
449 | if (err) | |
450 | goto drop; | |
451 | } | |
452 | } else { | |
453 | err = uncompress_addr(skb, &hdr.daddr, tmp, daddr, | |
4710d806 | 454 | daddr_type, daddr_len); |
8df8c56a | 455 | pr_debug("dest: stateless compression mode %d dest %pI6c\n", |
4710d806 | 456 | tmp, &hdr.daddr); |
8df8c56a JR |
457 | if (err) |
458 | goto drop; | |
459 | } | |
460 | ||
461 | /* UDP data uncompression */ | |
462 | if (iphc0 & LOWPAN_IPHC_NH_C) { | |
463 | struct udphdr uh; | |
464 | struct sk_buff *new; | |
4710d806 | 465 | |
8df8c56a JR |
466 | if (uncompress_udp_header(skb, &uh)) |
467 | goto drop; | |
468 | ||
4710d806 | 469 | /* replace the compressed UDP head by the uncompressed UDP |
8df8c56a JR |
470 | * header |
471 | */ | |
472 | new = skb_copy_expand(skb, sizeof(struct udphdr), | |
473 | skb_tailroom(skb), GFP_ATOMIC); | |
474 | kfree_skb(skb); | |
475 | ||
476 | if (!new) | |
477 | return -ENOMEM; | |
478 | ||
479 | skb = new; | |
480 | ||
481 | skb_push(skb, sizeof(struct udphdr)); | |
482 | skb_reset_transport_header(skb); | |
483 | skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr)); | |
484 | ||
485 | raw_dump_table(__func__, "raw UDP header dump", | |
4710d806 | 486 | (u8 *)&uh, sizeof(uh)); |
8df8c56a JR |
487 | |
488 | hdr.nexthdr = UIP_PROTO_UDP; | |
489 | } | |
490 | ||
491 | hdr.payload_len = htons(skb->len); | |
492 | ||
493 | pr_debug("skb headroom size = %d, data length = %d\n", | |
494 | skb_headroom(skb), skb->len); | |
495 | ||
496 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" | |
497 | "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
498 | hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, | |
499 | hdr.hop_limit, &hdr.daddr); | |
500 | ||
4710d806 VB |
501 | raw_dump_table(__func__, "raw header dump", |
502 | (u8 *)&hdr, sizeof(hdr)); | |
8df8c56a JR |
503 | |
504 | return skb_deliver(skb, &hdr, dev, deliver_skb); | |
505 | ||
506 | drop: | |
507 | kfree_skb(skb); | |
508 | return -EINVAL; | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(lowpan_process_data); | |
511 | ||
512 | static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, | |
4710d806 VB |
513 | const struct in6_addr *ipaddr, |
514 | const unsigned char *lladdr) | |
8df8c56a JR |
515 | { |
516 | u8 val = 0; | |
517 | ||
518 | if (is_addr_mac_addr_based(ipaddr, lladdr)) { | |
519 | val = 3; /* 0-bits */ | |
520 | pr_debug("address compression 0 bits\n"); | |
521 | } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { | |
522 | /* compress IID to 16 bits xxxx::XXXX */ | |
523 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); | |
524 | *hc06_ptr += 2; | |
525 | val = 2; /* 16-bits */ | |
526 | raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", | |
4710d806 | 527 | *hc06_ptr - 2, 2); |
8df8c56a JR |
528 | } else { |
529 | /* do not compress IID => xxxx::IID */ | |
530 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); | |
531 | *hc06_ptr += 8; | |
532 | val = 1; /* 64-bits */ | |
533 | raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", | |
4710d806 | 534 | *hc06_ptr - 8, 8); |
8df8c56a JR |
535 | } |
536 | ||
537 | return rol8(val, shift); | |
538 | } | |
539 | ||
540 | static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) | |
541 | { | |
542 | struct udphdr *uh = udp_hdr(skb); | |
5cede84c | 543 | u8 tmp; |
8df8c56a | 544 | |
e5d966ef AA |
545 | if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) == |
546 | LOWPAN_NHC_UDP_4BIT_PORT) && | |
547 | ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) == | |
548 | LOWPAN_NHC_UDP_4BIT_PORT)) { | |
8df8c56a | 549 | pr_debug("UDP header: both ports compression to 4 bits\n"); |
c567c771 | 550 | /* compression value */ |
5cede84c AA |
551 | tmp = LOWPAN_NHC_UDP_CS_P_11; |
552 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 AA |
553 | /* source and destination port */ |
554 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT + | |
555 | ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4); | |
5cede84c | 556 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 557 | } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
558 | LOWPAN_NHC_UDP_8BIT_PORT) { |
559 | pr_debug("UDP header: remove 8 bits of dest\n"); | |
c567c771 | 560 | /* compression value */ |
5cede84c AA |
561 | tmp = LOWPAN_NHC_UDP_CS_P_01; |
562 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 | 563 | /* source port */ |
5cede84c | 564 | lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); |
c567c771 AA |
565 | /* destination port */ |
566 | tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT; | |
5cede84c | 567 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
e5d966ef | 568 | } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) == |
8df8c56a JR |
569 | LOWPAN_NHC_UDP_8BIT_PORT) { |
570 | pr_debug("UDP header: remove 8 bits of source\n"); | |
c567c771 | 571 | /* compression value */ |
5cede84c AA |
572 | tmp = LOWPAN_NHC_UDP_CS_P_10; |
573 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 AA |
574 | /* source port */ |
575 | tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT; | |
5cede84c | 576 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); |
c567c771 | 577 | /* destination port */ |
95277eb1 | 578 | lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
579 | } else { |
580 | pr_debug("UDP header: can't compress\n"); | |
c567c771 | 581 | /* compression value */ |
5cede84c AA |
582 | tmp = LOWPAN_NHC_UDP_CS_P_00; |
583 | lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); | |
c567c771 | 584 | /* source port */ |
5cede84c | 585 | lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); |
c567c771 | 586 | /* destination port */ |
5cede84c | 587 | lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); |
8df8c56a JR |
588 | } |
589 | ||
590 | /* checksum is always inline */ | |
5cede84c | 591 | lowpan_push_hc_data(hc06_ptr, &uh->check, sizeof(uh->check)); |
8df8c56a JR |
592 | |
593 | /* skip the UDP header */ | |
594 | skb_pull(skb, sizeof(struct udphdr)); | |
595 | } | |
596 | ||
597 | int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, | |
4710d806 VB |
598 | unsigned short type, const void *_daddr, |
599 | const void *_saddr, unsigned int len) | |
8df8c56a JR |
600 | { |
601 | u8 tmp, iphc0, iphc1, *hc06_ptr; | |
602 | struct ipv6hdr *hdr; | |
603 | u8 head[100] = {}; | |
604 | ||
605 | if (type != ETH_P_IPV6) | |
606 | return -EINVAL; | |
607 | ||
608 | hdr = ipv6_hdr(skb); | |
609 | hc06_ptr = head + 2; | |
610 | ||
611 | pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" | |
612 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", | |
4710d806 VB |
613 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
614 | hdr->hop_limit, &hdr->daddr); | |
8df8c56a JR |
615 | |
616 | raw_dump_table(__func__, "raw skb network header dump", | |
4710d806 | 617 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
8df8c56a | 618 | |
4710d806 | 619 | /* As we copy some bit-length fields, in the IPHC encoding bytes, |
8df8c56a JR |
620 | * we sometimes use |= |
621 | * If the field is 0, and the current bit value in memory is 1, | |
622 | * this does not work. We therefore reset the IPHC encoding here | |
623 | */ | |
624 | iphc0 = LOWPAN_DISPATCH_IPHC; | |
625 | iphc1 = 0; | |
626 | ||
627 | /* TODO: context lookup */ | |
628 | ||
629 | raw_dump_inline(__func__, "saddr", | |
630 | (unsigned char *)_saddr, IEEE802154_ADDR_LEN); | |
631 | raw_dump_inline(__func__, "daddr", | |
632 | (unsigned char *)_daddr, IEEE802154_ADDR_LEN); | |
633 | ||
634 | raw_dump_table(__func__, | |
4710d806 VB |
635 | "sending raw skb network uncompressed packet", |
636 | skb->data, skb->len); | |
8df8c56a | 637 | |
4710d806 | 638 | /* Traffic class, flow label |
8df8c56a JR |
639 | * If flow label is 0, compress it. If traffic class is 0, compress it |
640 | * We have to process both in the same time as the offset of traffic | |
641 | * class depends on the presence of version and flow label | |
642 | */ | |
643 | ||
644 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ | |
645 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); | |
646 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); | |
647 | ||
648 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && | |
4710d806 | 649 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { |
8df8c56a JR |
650 | /* flow label can be compressed */ |
651 | iphc0 |= LOWPAN_IPHC_FL_C; | |
652 | if ((hdr->priority == 0) && | |
4710d806 | 653 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
654 | /* compress (elide) all */ |
655 | iphc0 |= LOWPAN_IPHC_TC_C; | |
656 | } else { | |
657 | /* compress only the flow label */ | |
658 | *hc06_ptr = tmp; | |
659 | hc06_ptr += 1; | |
660 | } | |
661 | } else { | |
662 | /* Flow label cannot be compressed */ | |
663 | if ((hdr->priority == 0) && | |
4710d806 | 664 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
8df8c56a JR |
665 | /* compress only traffic class */ |
666 | iphc0 |= LOWPAN_IPHC_TC_C; | |
667 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); | |
668 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); | |
669 | hc06_ptr += 3; | |
670 | } else { | |
671 | /* compress nothing */ | |
ce60e0c4 | 672 | memcpy(hc06_ptr, hdr, 4); |
8df8c56a JR |
673 | /* replace the top byte with new ECN | DSCP format */ |
674 | *hc06_ptr = tmp; | |
675 | hc06_ptr += 4; | |
676 | } | |
677 | } | |
678 | ||
679 | /* NOTE: payload length is always compressed */ | |
680 | ||
681 | /* Next Header is compress if UDP */ | |
682 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
683 | iphc0 |= LOWPAN_IPHC_NH_C; | |
684 | ||
685 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { | |
686 | *hc06_ptr = hdr->nexthdr; | |
687 | hc06_ptr += 1; | |
688 | } | |
689 | ||
4710d806 | 690 | /* Hop limit |
8df8c56a JR |
691 | * if 1: compress, encoding is 01 |
692 | * if 64: compress, encoding is 10 | |
693 | * if 255: compress, encoding is 11 | |
694 | * else do not compress | |
695 | */ | |
696 | switch (hdr->hop_limit) { | |
697 | case 1: | |
698 | iphc0 |= LOWPAN_IPHC_TTL_1; | |
699 | break; | |
700 | case 64: | |
701 | iphc0 |= LOWPAN_IPHC_TTL_64; | |
702 | break; | |
703 | case 255: | |
704 | iphc0 |= LOWPAN_IPHC_TTL_255; | |
705 | break; | |
706 | default: | |
707 | *hc06_ptr = hdr->hop_limit; | |
708 | hc06_ptr += 1; | |
709 | break; | |
710 | } | |
711 | ||
712 | /* source address compression */ | |
713 | if (is_addr_unspecified(&hdr->saddr)) { | |
714 | pr_debug("source address is unspecified, setting SAC\n"); | |
715 | iphc1 |= LOWPAN_IPHC_SAC; | |
716 | /* TODO: context lookup */ | |
717 | } else if (is_addr_link_local(&hdr->saddr)) { | |
718 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
719 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr); | |
720 | pr_debug("source address unicast link-local %pI6c " | |
721 | "iphc1 0x%02x\n", &hdr->saddr, iphc1); | |
722 | } else { | |
723 | pr_debug("send the full source address\n"); | |
724 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); | |
725 | hc06_ptr += 16; | |
726 | } | |
727 | ||
728 | /* destination address compression */ | |
729 | if (is_addr_mcast(&hdr->daddr)) { | |
730 | pr_debug("destination address is multicast: "); | |
731 | iphc1 |= LOWPAN_IPHC_M; | |
732 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { | |
733 | pr_debug("compressed to 1 octet\n"); | |
734 | iphc1 |= LOWPAN_IPHC_DAM_11; | |
735 | /* use last byte */ | |
736 | *hc06_ptr = hdr->daddr.s6_addr[15]; | |
737 | hc06_ptr += 1; | |
738 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { | |
739 | pr_debug("compressed to 4 octets\n"); | |
740 | iphc1 |= LOWPAN_IPHC_DAM_10; | |
741 | /* second byte + the last three */ | |
742 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
743 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); | |
744 | hc06_ptr += 4; | |
745 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { | |
746 | pr_debug("compressed to 6 octets\n"); | |
747 | iphc1 |= LOWPAN_IPHC_DAM_01; | |
748 | /* second byte + the last five */ | |
749 | *hc06_ptr = hdr->daddr.s6_addr[1]; | |
750 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); | |
751 | hc06_ptr += 6; | |
752 | } else { | |
753 | pr_debug("using full address\n"); | |
754 | iphc1 |= LOWPAN_IPHC_DAM_00; | |
755 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); | |
756 | hc06_ptr += 16; | |
757 | } | |
758 | } else { | |
759 | /* TODO: context lookup */ | |
760 | if (is_addr_link_local(&hdr->daddr)) { | |
761 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, | |
762 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr); | |
763 | pr_debug("dest address unicast link-local %pI6c " | |
764 | "iphc1 0x%02x\n", &hdr->daddr, iphc1); | |
765 | } else { | |
766 | pr_debug("dest address unicast %pI6c\n", &hdr->daddr); | |
767 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); | |
768 | hc06_ptr += 16; | |
769 | } | |
770 | } | |
771 | ||
772 | /* UDP header compression */ | |
773 | if (hdr->nexthdr == UIP_PROTO_UDP) | |
774 | compress_udp_header(&hc06_ptr, skb); | |
775 | ||
776 | head[0] = iphc0; | |
777 | head[1] = iphc1; | |
778 | ||
779 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
780 | skb_reset_transport_header(skb); | |
781 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); | |
782 | skb_reset_network_header(skb); | |
783 | ||
784 | pr_debug("header len %d skb %u\n", (int)(hc06_ptr - head), skb->len); | |
785 | ||
786 | raw_dump_table(__func__, "raw skb data dump compressed", | |
4710d806 | 787 | skb->data, skb->len); |
8df8c56a JR |
788 | return 0; |
789 | } | |
790 | EXPORT_SYMBOL_GPL(lowpan_header_compress); | |
5ae5e991 YD |
791 | |
792 | MODULE_LICENSE("GPL"); |