1/* 2 * Copyright 2011, Siemens AG 3 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 4 */ 5 6/* Based on patches from Jon Smirl <jonsmirl@gmail.com> 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 */ 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/module.h> 52#include <linux/netdevice.h> 53#include <net/6lowpan.h> 54#include <net/ipv6.h> 55#include <net/af_ieee802154.h> 56 57#include "nhc.h" 58 59/* Uncompress address function for source and 60 * destination address(non-multicast). 61 * 62 * address_mode is sam value or dam value. 63 */ 64static int uncompress_addr(struct sk_buff *skb, 65 struct in6_addr *ipaddr, const u8 address_mode, 66 const u8 *lladdr, const u8 addr_type, 67 const u8 addr_len) 68{ 69 bool fail; 70 71 switch (address_mode) { 72 case LOWPAN_IPHC_ADDR_00: 73 /* for global link addresses */ 74 fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); 75 break; 76 case LOWPAN_IPHC_ADDR_01: 77 /* fe:80::XXXX:XXXX:XXXX:XXXX */ 78 ipaddr->s6_addr[0] = 0xFE; 79 ipaddr->s6_addr[1] = 0x80; 80 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8); 81 break; 82 case LOWPAN_IPHC_ADDR_02: 83 /* fe:80::ff:fe00:XXXX */ 84 ipaddr->s6_addr[0] = 0xFE; 85 ipaddr->s6_addr[1] = 0x80; 86 ipaddr->s6_addr[11] = 0xFF; 87 ipaddr->s6_addr[12] = 0xFE; 88 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2); 89 break; 90 case LOWPAN_IPHC_ADDR_03: 91 fail = false; 92 switch (addr_type) { 93 case IEEE802154_ADDR_LONG: 94 /* fe:80::XXXX:XXXX:XXXX:XXXX 95 * \_________________/ 96 * hwaddr 97 */ 98 ipaddr->s6_addr[0] = 0xFE; 99 ipaddr->s6_addr[1] = 0x80; 100 memcpy(&ipaddr->s6_addr[8], lladdr, addr_len); 101 /* second bit-flip (Universe/Local) 102 * is done according RFC2464 103 */ 104 ipaddr->s6_addr[8] ^= 0x02; 105 break; 106 case IEEE802154_ADDR_SHORT: 107 /* fe:80::ff:fe00:XXXX 108 * \__/ 109 * short_addr 110 * 111 * Universe/Local bit is zero. 112 */ 113 ipaddr->s6_addr[0] = 0xFE; 114 ipaddr->s6_addr[1] = 0x80; 115 ipaddr->s6_addr[11] = 0xFF; 116 ipaddr->s6_addr[12] = 0xFE; 117 ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr)); 118 break; 119 default: 120 pr_debug("Invalid addr_type set\n"); 121 return -EINVAL; 122 } 123 break; 124 default: 125 pr_debug("Invalid address mode value: 0x%x\n", address_mode); 126 return -EINVAL; 127 } 128 129 if (fail) { 130 pr_debug("Failed to fetch skb data\n"); 131 return -EIO; 132 } 133 134 raw_dump_inline(NULL, "Reconstructed ipv6 addr is", 135 ipaddr->s6_addr, 16); 136 137 return 0; 138} 139 140/* Uncompress address function for source context 141 * based address(non-multicast). 142 */ 143static int uncompress_context_based_src_addr(struct sk_buff *skb, 144 struct in6_addr *ipaddr, 145 const u8 sam) 146{ 147 switch (sam) { 148 case LOWPAN_IPHC_ADDR_00: 149 /* unspec address :: 150 * Do nothing, address is already :: 151 */ 152 break; 153 case LOWPAN_IPHC_ADDR_01: 154 /* TODO */ 155 case LOWPAN_IPHC_ADDR_02: 156 /* TODO */ 157 case LOWPAN_IPHC_ADDR_03: 158 /* TODO */ 159 netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam); 160 return -EINVAL; 161 default: 162 pr_debug("Invalid sam value: 0x%x\n", sam); 163 return -EINVAL; 164 } 165 166 raw_dump_inline(NULL, 167 "Reconstructed context based ipv6 src addr is", 168 ipaddr->s6_addr, 16); 169 170 return 0; 171} 172 173/* Uncompress function for multicast destination address, 174 * when M bit is set. 175 */ 176static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb, 177 struct in6_addr *ipaddr, 178 const u8 dam) 179{ 180 bool fail; 181 182 switch (dam) { 183 case LOWPAN_IPHC_DAM_00: 184 /* 00: 128 bits. The full address 185 * is carried in-line. 186 */ 187 fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16); 188 break; 189 case LOWPAN_IPHC_DAM_01: 190 /* 01: 48 bits. The address takes 191 * the form ffXX::00XX:XXXX:XXXX. 192 */ 193 ipaddr->s6_addr[0] = 0xFF; 194 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); 195 fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5); 196 break; 197 case LOWPAN_IPHC_DAM_10: 198 /* 10: 32 bits. The address takes 199 * the form ffXX::00XX:XXXX. 200 */ 201 ipaddr->s6_addr[0] = 0xFF; 202 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1); 203 fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3); 204 break; 205 case LOWPAN_IPHC_DAM_11: 206 /* 11: 8 bits. The address takes 207 * the form ff02::00XX. 208 */ 209 ipaddr->s6_addr[0] = 0xFF; 210 ipaddr->s6_addr[1] = 0x02; 211 fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1); 212 break; 213 default: 214 pr_debug("DAM value has a wrong value: 0x%x\n", dam); 215 return -EINVAL; 216 } 217 218 if (fail) { 219 pr_debug("Failed to fetch skb data\n"); 220 return -EIO; 221 } 222 223 raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is", 224 ipaddr->s6_addr, 16); 225 226 return 0; 227} 228 229/* TTL uncompression values */ 230static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 }; 231 232int 233lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev, 234 const u8 *saddr, const u8 saddr_type, 235 const u8 saddr_len, const u8 *daddr, 236 const u8 daddr_type, const u8 daddr_len, 237 u8 iphc0, u8 iphc1) 238{ 239 struct ipv6hdr hdr = {}; 240 u8 tmp, num_context = 0; 241 int err; 242 243 raw_dump_table(__func__, "raw skb data dump uncompressed", 244 skb->data, skb->len); 245 246 /* another if the CID flag is set */ 247 if (iphc1 & LOWPAN_IPHC_CID) { 248 pr_debug("CID flag is set, increase header with one\n"); 249 if (lowpan_fetch_skb(skb, &num_context, sizeof(num_context))) 250 return -EINVAL; 251 } 252 253 hdr.version = 6; 254 255 /* Traffic Class and Flow Label */ 256 switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { 257 /* Traffic Class and FLow Label carried in-line 258 * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) 259 */ 260 case 0: /* 00b */ 261 if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) 262 return -EINVAL; 263 264 memcpy(&hdr.flow_lbl, &skb->data[0], 3); 265 skb_pull(skb, 3); 266 hdr.priority = ((tmp >> 2) & 0x0f); 267 hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | 268 (hdr.flow_lbl[0] & 0x0f); 269 break; 270 /* Traffic class carried in-line 271 * ECN + DSCP (1 byte), Flow Label is elided 272 */ 273 case 2: /* 10b */ 274 if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) 275 return -EINVAL; 276 277 hdr.priority = ((tmp >> 2) & 0x0f); 278 hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); 279 break; 280 /* Flow Label carried in-line 281 * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided 282 */ 283 case 1: /* 01b */ 284 if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp))) 285 return -EINVAL; 286 287 hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); 288 memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); 289 skb_pull(skb, 2); 290 break; 291 /* Traffic Class and Flow Label are elided */ 292 case 3: /* 11b */ 293 break; 294 default: 295 break; 296 } 297 298 /* Next Header */ 299 if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { 300 /* Next header is carried inline */ 301 if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr))) 302 return -EINVAL; 303 304 pr_debug("NH flag is set, next header carried inline: %02x\n", 305 hdr.nexthdr); 306 } 307 308 /* Hop Limit */ 309 if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) { 310 hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; 311 } else { 312 if (lowpan_fetch_skb(skb, &hdr.hop_limit, 313 sizeof(hdr.hop_limit))) 314 return -EINVAL; 315 } 316 317 /* Extract SAM to the tmp variable */ 318 tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; 319 320 if (iphc1 & LOWPAN_IPHC_SAC) { 321 /* Source address context based uncompression */ 322 pr_debug("SAC bit is set. Handle context based source address.\n"); 323 err = uncompress_context_based_src_addr(skb, &hdr.saddr, tmp); 324 } else { 325 /* Source address uncompression */ 326 pr_debug("source address stateless compression\n"); 327 err = uncompress_addr(skb, &hdr.saddr, tmp, saddr, 328 saddr_type, saddr_len); 329 } 330 331 /* Check on error of previous branch */ 332 if (err) 333 return -EINVAL; 334 335 /* Extract DAM to the tmp variable */ 336 tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; 337 338 /* check for Multicast Compression */ 339 if (iphc1 & LOWPAN_IPHC_M) { 340 if (iphc1 & LOWPAN_IPHC_DAC) { 341 pr_debug("dest: context-based mcast compression\n"); 342 /* TODO: implement this */ 343 } else { 344 err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr, 345 tmp); 346 347 if (err) 348 return -EINVAL; 349 } 350 } else { 351 err = uncompress_addr(skb, &hdr.daddr, tmp, daddr, 352 daddr_type, daddr_len); 353 pr_debug("dest: stateless compression mode %d dest %pI6c\n", 354 tmp, &hdr.daddr); 355 if (err) 356 return -EINVAL; 357 } 358 359 /* Next header data uncompression */ 360 if (iphc0 & LOWPAN_IPHC_NH_C) { 361 err = lowpan_nhc_do_uncompression(skb, dev, &hdr); 362 if (err < 0) 363 return err; 364 } else { 365 err = skb_cow(skb, sizeof(hdr)); 366 if (unlikely(err)) 367 return err; 368 } 369 370 hdr.payload_len = htons(skb->len); 371 372 pr_debug("skb headroom size = %d, data length = %d\n", 373 skb_headroom(skb), skb->len); 374 375 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" 376 "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", 377 hdr.version, ntohs(hdr.payload_len), hdr.nexthdr, 378 hdr.hop_limit, &hdr.daddr); 379 380 skb_push(skb, sizeof(hdr)); 381 skb_reset_network_header(skb); 382 skb_copy_to_linear_data(skb, &hdr, sizeof(hdr)); 383 384 raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr)); 385 386 return 0; 387} 388EXPORT_SYMBOL_GPL(lowpan_header_decompress); 389 390static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift, 391 const struct in6_addr *ipaddr, 392 const unsigned char *lladdr) 393{ 394 u8 val = 0; 395 396 if (is_addr_mac_addr_based(ipaddr, lladdr)) { 397 val = 3; /* 0-bits */ 398 pr_debug("address compression 0 bits\n"); 399 } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { 400 /* compress IID to 16 bits xxxx::XXXX */ 401 lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2); 402 val = 2; /* 16-bits */ 403 raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)", 404 *hc_ptr - 2, 2); 405 } else { 406 /* do not compress IID => xxxx::IID */ 407 lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8); 408 val = 1; /* 64-bits */ 409 raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)", 410 *hc_ptr - 8, 8); 411 } 412 413 return rol8(val, shift); 414} 415 416int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, 417 unsigned short type, const void *_daddr, 418 const void *_saddr, unsigned int len) 419{ 420 u8 tmp, iphc0, iphc1, *hc_ptr; 421 struct ipv6hdr *hdr; 422 u8 head[100] = {}; 423 int ret, addr_type; 424 425 if (type != ETH_P_IPV6) 426 return -EINVAL; 427 428 hdr = ipv6_hdr(skb); 429 hc_ptr = head + 2; 430 431 pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" 432 "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n", 433 hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, 434 hdr->hop_limit, &hdr->daddr); 435 436 raw_dump_table(__func__, "raw skb network header dump", 437 skb_network_header(skb), sizeof(struct ipv6hdr)); 438 439 /* As we copy some bit-length fields, in the IPHC encoding bytes, 440 * we sometimes use |= 441 * If the field is 0, and the current bit value in memory is 1, 442 * this does not work. We therefore reset the IPHC encoding here 443 */ 444 iphc0 = LOWPAN_DISPATCH_IPHC; 445 iphc1 = 0; 446 447 /* TODO: context lookup */ 448 449 raw_dump_inline(__func__, "saddr", 450 (unsigned char *)_saddr, IEEE802154_ADDR_LEN); 451 raw_dump_inline(__func__, "daddr", 452 (unsigned char *)_daddr, IEEE802154_ADDR_LEN); 453 454 raw_dump_table(__func__, "sending raw skb network uncompressed packet", 455 skb->data, skb->len); 456 457 /* Traffic class, flow label 458 * If flow label is 0, compress it. If traffic class is 0, compress it 459 * We have to process both in the same time as the offset of traffic 460 * class depends on the presence of version and flow label 461 */ 462 463 /* hc format of TC is ECN | DSCP , original one is DSCP | ECN */ 464 tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); 465 tmp = ((tmp & 0x03) << 6) | (tmp >> 2); 466 467 if (((hdr->flow_lbl[0] & 0x0F) == 0) && 468 (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { 469 /* flow label can be compressed */ 470 iphc0 |= LOWPAN_IPHC_FL_C; 471 if ((hdr->priority == 0) && 472 ((hdr->flow_lbl[0] & 0xF0) == 0)) { 473 /* compress (elide) all */ 474 iphc0 |= LOWPAN_IPHC_TC_C; 475 } else { 476 /* compress only the flow label */ 477 *hc_ptr = tmp; 478 hc_ptr += 1; 479 } 480 } else { 481 /* Flow label cannot be compressed */ 482 if ((hdr->priority == 0) && 483 ((hdr->flow_lbl[0] & 0xF0) == 0)) { 484 /* compress only traffic class */ 485 iphc0 |= LOWPAN_IPHC_TC_C; 486 *hc_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); 487 memcpy(hc_ptr + 1, &hdr->flow_lbl[1], 2); 488 hc_ptr += 3; 489 } else { 490 /* compress nothing */ 491 memcpy(hc_ptr, hdr, 4); 492 /* replace the top byte with new ECN | DSCP format */ 493 *hc_ptr = tmp; 494 hc_ptr += 4; 495 } 496 } 497 498 /* NOTE: payload length is always compressed */ 499 500 /* Check if we provide the nhc format for nexthdr and compression 501 * functionality. If not nexthdr is handled inline and not compressed. 502 */ 503 ret = lowpan_nhc_check_compression(skb, hdr, &hc_ptr, &iphc0); 504 if (ret < 0) 505 return ret; 506 507 /* Hop limit 508 * if 1: compress, encoding is 01 509 * if 64: compress, encoding is 10 510 * if 255: compress, encoding is 11 511 * else do not compress 512 */ 513 switch (hdr->hop_limit) { 514 case 1: 515 iphc0 |= LOWPAN_IPHC_TTL_1; 516 break; 517 case 64: 518 iphc0 |= LOWPAN_IPHC_TTL_64; 519 break; 520 case 255: 521 iphc0 |= LOWPAN_IPHC_TTL_255; 522 break; 523 default: 524 lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit, 525 sizeof(hdr->hop_limit)); 526 } 527 528 addr_type = ipv6_addr_type(&hdr->saddr); 529 /* source address compression */ 530 if (addr_type == IPV6_ADDR_ANY) { 531 pr_debug("source address is unspecified, setting SAC\n"); 532 iphc1 |= LOWPAN_IPHC_SAC; 533 } else { 534 if (addr_type & IPV6_ADDR_LINKLOCAL) { 535 iphc1 |= lowpan_compress_addr_64(&hc_ptr, 536 LOWPAN_IPHC_SAM_BIT, 537 &hdr->saddr, _saddr); 538 pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n", 539 &hdr->saddr, iphc1); 540 } else { 541 pr_debug("send the full source address\n"); 542 lowpan_push_hc_data(&hc_ptr, hdr->saddr.s6_addr, 16); 543 } 544 } 545 546 addr_type = ipv6_addr_type(&hdr->daddr); 547 /* destination address compression */ 548 if (addr_type & IPV6_ADDR_MULTICAST) { 549 pr_debug("destination address is multicast: "); 550 iphc1 |= LOWPAN_IPHC_M; 551 if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { 552 pr_debug("compressed to 1 octet\n"); 553 iphc1 |= LOWPAN_IPHC_DAM_11; 554 /* use last byte */ 555 lowpan_push_hc_data(&hc_ptr, 556 &hdr->daddr.s6_addr[15], 1); 557 } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { 558 pr_debug("compressed to 4 octets\n"); 559 iphc1 |= LOWPAN_IPHC_DAM_10; 560 /* second byte + the last three */ 561 lowpan_push_hc_data(&hc_ptr, 562 &hdr->daddr.s6_addr[1], 1); 563 lowpan_push_hc_data(&hc_ptr, 564 &hdr->daddr.s6_addr[13], 3); 565 } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { 566 pr_debug("compressed to 6 octets\n"); 567 iphc1 |= LOWPAN_IPHC_DAM_01; 568 /* second byte + the last five */ 569 lowpan_push_hc_data(&hc_ptr, 570 &hdr->daddr.s6_addr[1], 1); 571 lowpan_push_hc_data(&hc_ptr, 572 &hdr->daddr.s6_addr[11], 5); 573 } else { 574 pr_debug("using full address\n"); 575 iphc1 |= LOWPAN_IPHC_DAM_00; 576 lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); 577 } 578 } else { 579 if (addr_type & IPV6_ADDR_LINKLOCAL) { 580 /* TODO: context lookup */ 581 iphc1 |= lowpan_compress_addr_64(&hc_ptr, 582 LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr); 583 pr_debug("dest address unicast link-local %pI6c " 584 "iphc1 0x%02x\n", &hdr->daddr, iphc1); 585 } else { 586 pr_debug("dest address unicast %pI6c\n", &hdr->daddr); 587 lowpan_push_hc_data(&hc_ptr, hdr->daddr.s6_addr, 16); 588 } 589 } 590 591 /* next header compression */ 592 if (iphc0 & LOWPAN_IPHC_NH_C) { 593 ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr); 594 if (ret < 0) 595 return ret; 596 } 597 598 head[0] = iphc0; 599 head[1] = iphc1; 600 601 skb_pull(skb, sizeof(struct ipv6hdr)); 602 skb_reset_transport_header(skb); 603 memcpy(skb_push(skb, hc_ptr - head), head, hc_ptr - head); 604 skb_reset_network_header(skb); 605 606 pr_debug("header len %d skb %u\n", (int)(hc_ptr - head), skb->len); 607 608 raw_dump_table(__func__, "raw skb data dump compressed", 609 skb->data, skb->len); 610 return 0; 611} 612EXPORT_SYMBOL_GPL(lowpan_header_compress); 613 614static int __init lowpan_module_init(void) 615{ 616 request_module_nowait("nhc_dest"); 617 request_module_nowait("nhc_fragment"); 618 request_module_nowait("nhc_hop"); 619 request_module_nowait("nhc_ipv6"); 620 request_module_nowait("nhc_mobility"); 621 request_module_nowait("nhc_routing"); 622 request_module_nowait("nhc_udp"); 623 624 return 0; 625} 626module_init(lowpan_module_init); 627 628MODULE_LICENSE("GPL"); 629