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Commit 2c6bed7cfcd3f594ed9e4d6919fa2ebea2243d19

Authored by Alexander Aring
Committed by Marcel Holtmann
1 parent 6c53823ae0
Exists in ti-lsk-linux-4.1.y and in 10 other branches dlt-processor-sdk-linux-03.00.00.04, processor-sdk-linux-02.00.01, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04

6lowpan: introduce new net/6lowpan directory 

This patch moves generic code which is used by bluetooth and ieee802154
6lowpan to a new net/6lowpan directory. This directory contains generic
6LoWPAN code which is shared between bluetooth and ieee802154 MAC-Layer.

This is the IPHC - "IPv6 Header Compression" format at the moment. Which
is described by RFC 6282 [0]. The BLTE 6LoWPAN draft describes that the
IPHC is the same format like IEEE 802.15.4, see [1].

Futuremore we can put more code into this directory which is shared
between BLTE and IEEE 802.15.4 6LoWPAN like RFC 6775 or the routing
protocol RPL RFC 6550.

To avoid naming conflicts I renamed 6lowpan-y to ieee802154_6lowpan-y
in net/ieee802154/Makefile.

[0] http://tools.ietf.org/html/rfc6282
[1] http://tools.ietf.org/html/draft-ietf-6lowpan-btle-12#section-3.2
[2] http://tools.ietf.org/html/rfc6775
[3] http://tools.ietf.org/html/rfc6550

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Showing 9 changed files with 817 additions and 815 deletions Side-by-side Diff

  1 +config 6LOWPAN
  2 + bool "6LoWPAN Support"
  3 + depends on IPV6
  4 + ---help---
  5 + This enables IPv6 over Low power Wireless Personal Area Network -
  6 + "6LoWPAN" which is supported by IEEE 802.15.4 or Bluetooth stacks.
net/6lowpan/Makefile
Diff comments   View file @ 2c6bed7
  1 +obj-$(CONFIG_6LOWPAN) := 6lowpan.o
  2 +
  3 +6lowpan-y := iphc.o
  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>
  55 +#include <linux/module.h>
  56 +#include <linux/netdevice.h>
  57 +#include <net/6lowpan.h>
  58 +#include <net/ipv6.h>
  59 +#include <net/af_ieee802154.h>
  60 +
  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 +{
  268 + bool fail;
  269 + u8 tmp = 0, val = 0;
  270 +
  271 + if (!uh)
  272 + goto err;
  273 +
  274 + fail = lowpan_fetch_skb(skb, &tmp, 1);
  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:
  280 + fail |= lowpan_fetch_skb(skb, &uh->source, 2);
  281 + fail |= lowpan_fetch_skb(skb, &uh->dest, 2);
  282 + break;
  283 + case LOWPAN_NHC_UDP_CS_P_01:
  284 + fail |= lowpan_fetch_skb(skb, &uh->source, 2);
  285 + fail |= lowpan_fetch_skb(skb, &val, 1);
  286 + uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT);
  287 + break;
  288 + case LOWPAN_NHC_UDP_CS_P_10:
  289 + fail |= lowpan_fetch_skb(skb, &val, 1);
  290 + uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT);
  291 + fail |= lowpan_fetch_skb(skb, &uh->dest, 2);
  292 + break;
  293 + case LOWPAN_NHC_UDP_CS_P_11:
  294 + fail |= lowpan_fetch_skb(skb, &val, 1);
  295 + uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT +
  296 + (val >> 4));
  297 + uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT +
  298 + (val & 0x0f));
  299 + break;
  300 + default:
  301 + pr_debug("ERROR: unknown UDP format\n");
  302 + goto err;
  303 + break;
  304 + }
  305 +
  306 + pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
  307 + ntohs(uh->source), ntohs(uh->dest));
  308 +
  309 + /* checksum */
  310 + if (tmp & LOWPAN_NHC_UDP_CS_C) {
  311 + pr_debug_ratelimited("checksum elided currently not supported\n");
  312 + goto err;
  313 + } else {
  314 + fail |= lowpan_fetch_skb(skb, &uh->check, 2);
  315 + }
  316 +
  317 + /*
  318 + * UDP lenght needs to be infered from the lower layers
  319 + * here, we obtain the hint from the remaining size of the
  320 + * frame
  321 + */
  322 + uh->len = htons(skb->len + sizeof(struct udphdr));
  323 + pr_debug("uncompressed UDP length: src = %d", ntohs(uh->len));
  324 + } else {
  325 + pr_debug("ERROR: unsupported NH format\n");
  326 + goto err;
  327 + }
  328 +
  329 + if (fail)
  330 + goto err;
  331 +
  332 + return 0;
  333 +err:
  334 + return -EINVAL;
  335 +}
  336 +
  337 +/* TTL uncompression values */
  338 +static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 };
  339 +
  340 +int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
  341 + const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
  342 + const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
  343 + u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb)
  344 +{
  345 + struct ipv6hdr hdr = {};
  346 + u8 tmp, num_context = 0;
  347 + int err;
  348 +
  349 + raw_dump_table(__func__, "raw skb data dump uncompressed",
  350 + skb->data, skb->len);
  351 +
  352 + /* another if the CID flag is set */
  353 + if (iphc1 & LOWPAN_IPHC_CID) {
  354 + pr_debug("CID flag is set, increase header with one\n");
  355 + if (lowpan_fetch_skb_u8(skb, &num_context))
  356 + goto drop;
  357 + }
  358 +
  359 + hdr.version = 6;
  360 +
  361 + /* Traffic Class and Flow Label */
  362 + switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
  363 + /*
  364 + * Traffic Class and FLow Label carried in-line
  365 + * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
  366 + */
  367 + case 0: /* 00b */
  368 + if (lowpan_fetch_skb_u8(skb, &tmp))
  369 + goto drop;
  370 +
  371 + memcpy(&hdr.flow_lbl, &skb->data[0], 3);
  372 + skb_pull(skb, 3);
  373 + hdr.priority = ((tmp >> 2) & 0x0f);
  374 + hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
  375 + (hdr.flow_lbl[0] & 0x0f);
  376 + break;
  377 + /*
  378 + * Traffic class carried in-line
  379 + * ECN + DSCP (1 byte), Flow Label is elided
  380 + */
  381 + case 2: /* 10b */
  382 + if (lowpan_fetch_skb_u8(skb, &tmp))
  383 + goto drop;
  384 +
  385 + hdr.priority = ((tmp >> 2) & 0x0f);
  386 + hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
  387 + break;
  388 + /*
  389 + * Flow Label carried in-line
  390 + * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
  391 + */
  392 + case 1: /* 01b */
  393 + if (lowpan_fetch_skb_u8(skb, &tmp))
  394 + goto drop;
  395 +
  396 + hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
  397 + memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
  398 + skb_pull(skb, 2);
  399 + break;
  400 + /* Traffic Class and Flow Label are elided */
  401 + case 3: /* 11b */
  402 + break;
  403 + default:
  404 + break;
  405 + }
  406 +
  407 + /* Next Header */
  408 + if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
  409 + /* Next header is carried inline */
  410 + if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
  411 + goto drop;
  412 +
  413 + pr_debug("NH flag is set, next header carried inline: %02x\n",
  414 + hdr.nexthdr);
  415 + }
  416 +
  417 + /* Hop Limit */
  418 + if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
  419 + hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
  420 + else {
  421 + if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
  422 + goto drop;
  423 + }
  424 +
  425 + /* Extract SAM to the tmp variable */
  426 + tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
  427 +
  428 + if (iphc1 & LOWPAN_IPHC_SAC) {
  429 + /* Source address context based uncompression */
  430 + pr_debug("SAC bit is set. Handle context based source address.\n");
  431 + err = uncompress_context_based_src_addr(
  432 + skb, &hdr.saddr, tmp);
  433 + } else {
  434 + /* Source address uncompression */
  435 + pr_debug("source address stateless compression\n");
  436 + err = uncompress_addr(skb, &hdr.saddr, tmp, saddr,
  437 + saddr_type, saddr_len);
  438 + }
  439 +
  440 + /* Check on error of previous branch */
  441 + if (err)
  442 + goto drop;
  443 +
  444 + /* Extract DAM to the tmp variable */
  445 + tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
  446 +
  447 + /* check for Multicast Compression */
  448 + if (iphc1 & LOWPAN_IPHC_M) {
  449 + if (iphc1 & LOWPAN_IPHC_DAC) {
  450 + pr_debug("dest: context-based mcast compression\n");
  451 + /* TODO: implement this */
  452 + } else {
  453 + err = lowpan_uncompress_multicast_daddr(
  454 + skb, &hdr.daddr, tmp);
  455 + if (err)
  456 + goto drop;
  457 + }
  458 + } else {
  459 + err = uncompress_addr(skb, &hdr.daddr, tmp, daddr,
  460 + daddr_type, daddr_len);
  461 + pr_debug("dest: stateless compression mode %d dest %pI6c\n",
  462 + tmp, &hdr.daddr);
  463 + if (err)
  464 + goto drop;
  465 + }
  466 +
  467 + /* UDP data uncompression */
  468 + if (iphc0 & LOWPAN_IPHC_NH_C) {
  469 + struct udphdr uh;
  470 + struct sk_buff *new;
  471 + if (uncompress_udp_header(skb, &uh))
  472 + goto drop;
  473 +
  474 + /*
  475 + * replace the compressed UDP head by the uncompressed UDP
  476 + * header
  477 + */
  478 + new = skb_copy_expand(skb, sizeof(struct udphdr),
  479 + skb_tailroom(skb), GFP_ATOMIC);
  480 + kfree_skb(skb);
  481 +
  482 + if (!new)
  483 + return -ENOMEM;
  484 +
  485 + skb = new;
  486 +
  487 + skb_push(skb, sizeof(struct udphdr));
  488 + skb_reset_transport_header(skb);
  489 + skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
  490 +
  491 + raw_dump_table(__func__, "raw UDP header dump",
  492 + (u8 *)&uh, sizeof(uh));
  493 +
  494 + hdr.nexthdr = UIP_PROTO_UDP;
  495 + }
  496 +
  497 + hdr.payload_len = htons(skb->len);
  498 +
  499 + pr_debug("skb headroom size = %d, data length = %d\n",
  500 + skb_headroom(skb), skb->len);
  501 +
  502 + pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
  503 + "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
  504 + hdr.version, ntohs(hdr.payload_len), hdr.nexthdr,
  505 + hdr.hop_limit, &hdr.daddr);
  506 +
  507 + raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
  508 + sizeof(hdr));
  509 +
  510 + return skb_deliver(skb, &hdr, dev, deliver_skb);
  511 +
  512 +drop:
  513 + kfree_skb(skb);
  514 + return -EINVAL;
  515 +}
  516 +EXPORT_SYMBOL_GPL(lowpan_process_data);
  517 +
  518 +static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift,
  519 + const struct in6_addr *ipaddr,
  520 + const unsigned char *lladdr)
  521 +{
  522 + u8 val = 0;
  523 +
  524 + if (is_addr_mac_addr_based(ipaddr, lladdr)) {
  525 + val = 3; /* 0-bits */
  526 + pr_debug("address compression 0 bits\n");
  527 + } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
  528 + /* compress IID to 16 bits xxxx::XXXX */
  529 + memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
  530 + *hc06_ptr += 2;
  531 + val = 2; /* 16-bits */
  532 + raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
  533 + *hc06_ptr - 2, 2);
  534 + } else {
  535 + /* do not compress IID => xxxx::IID */
  536 + memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
  537 + *hc06_ptr += 8;
  538 + val = 1; /* 64-bits */
  539 + raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
  540 + *hc06_ptr - 8, 8);
  541 + }
  542 +
  543 + return rol8(val, shift);
  544 +}
  545 +
  546 +static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
  547 +{
  548 + struct udphdr *uh = udp_hdr(skb);
  549 + u8 tmp;
  550 +
  551 + if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) ==
  552 + LOWPAN_NHC_UDP_4BIT_PORT) &&
  553 + ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) ==
  554 + LOWPAN_NHC_UDP_4BIT_PORT)) {
  555 + pr_debug("UDP header: both ports compression to 4 bits\n");
  556 + /* compression value */
  557 + tmp = LOWPAN_NHC_UDP_CS_P_11;
  558 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  559 + /* source and destination port */
  560 + tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT +
  561 + ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4);
  562 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  563 + } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) ==
  564 + LOWPAN_NHC_UDP_8BIT_PORT) {
  565 + pr_debug("UDP header: remove 8 bits of dest\n");
  566 + /* compression value */
  567 + tmp = LOWPAN_NHC_UDP_CS_P_01;
  568 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  569 + /* source port */
  570 + lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source));
  571 + /* destination port */
  572 + tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT;
  573 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  574 + } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) ==
  575 + LOWPAN_NHC_UDP_8BIT_PORT) {
  576 + pr_debug("UDP header: remove 8 bits of source\n");
  577 + /* compression value */
  578 + tmp = LOWPAN_NHC_UDP_CS_P_10;
  579 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  580 + /* source port */
  581 + tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT;
  582 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  583 + /* destination port */
  584 + lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest));
  585 + } else {
  586 + pr_debug("UDP header: can't compress\n");
  587 + /* compression value */
  588 + tmp = LOWPAN_NHC_UDP_CS_P_00;
  589 + lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
  590 + /* source port */
  591 + lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source));
  592 + /* destination port */
  593 + lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest));
  594 + }
  595 +
  596 + /* checksum is always inline */
  597 + lowpan_push_hc_data(hc06_ptr, &uh->check, sizeof(uh->check));
  598 +
  599 + /* skip the UDP header */
  600 + skb_pull(skb, sizeof(struct udphdr));
  601 +}
  602 +
  603 +int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
  604 + unsigned short type, const void *_daddr,
  605 + const void *_saddr, unsigned int len)
  606 +{
  607 + u8 tmp, iphc0, iphc1, *hc06_ptr;
  608 + struct ipv6hdr *hdr;
  609 + u8 head[100] = {};
  610 +
  611 + if (type != ETH_P_IPV6)
  612 + return -EINVAL;
  613 +
  614 + hdr = ipv6_hdr(skb);
  615 + hc06_ptr = head + 2;
  616 +
  617 + pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
  618 + "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
  619 + hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
  620 + hdr->hop_limit, &hdr->daddr);
  621 +
  622 + raw_dump_table(__func__, "raw skb network header dump",
  623 + skb_network_header(skb), sizeof(struct ipv6hdr));
  624 +
  625 + /*
  626 + * As we copy some bit-length fields, in the IPHC encoding bytes,
  627 + * we sometimes use |=
  628 + * If the field is 0, and the current bit value in memory is 1,
  629 + * this does not work. We therefore reset the IPHC encoding here
  630 + */
  631 + iphc0 = LOWPAN_DISPATCH_IPHC;
  632 + iphc1 = 0;
  633 +
  634 + /* TODO: context lookup */
  635 +
  636 + raw_dump_inline(__func__, "saddr",
  637 + (unsigned char *)_saddr, IEEE802154_ADDR_LEN);
  638 + raw_dump_inline(__func__, "daddr",
  639 + (unsigned char *)_daddr, IEEE802154_ADDR_LEN);
  640 +
  641 + raw_dump_table(__func__,
  642 + "sending raw skb network uncompressed packet",
  643 + skb->data, skb->len);
  644 +
  645 + /*
  646 + * Traffic class, flow label
  647 + * If flow label is 0, compress it. If traffic class is 0, compress it
  648 + * We have to process both in the same time as the offset of traffic
  649 + * class depends on the presence of version and flow label
  650 + */
  651 +
  652 + /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
  653 + tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
  654 + tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
  655 +
  656 + if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
  657 + (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
  658 + /* flow label can be compressed */
  659 + iphc0 |= LOWPAN_IPHC_FL_C;
  660 + if ((hdr->priority == 0) &&
  661 + ((hdr->flow_lbl[0] & 0xF0) == 0)) {
  662 + /* compress (elide) all */
  663 + iphc0 |= LOWPAN_IPHC_TC_C;
  664 + } else {
  665 + /* compress only the flow label */
  666 + *hc06_ptr = tmp;
  667 + hc06_ptr += 1;
  668 + }
  669 + } else {
  670 + /* Flow label cannot be compressed */
  671 + if ((hdr->priority == 0) &&
  672 + ((hdr->flow_lbl[0] & 0xF0) == 0)) {
  673 + /* compress only traffic class */
  674 + iphc0 |= LOWPAN_IPHC_TC_C;
  675 + *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
  676 + memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
  677 + hc06_ptr += 3;
  678 + } else {
  679 + /* compress nothing */
  680 + memcpy(hc06_ptr, hdr, 4);
  681 + /* replace the top byte with new ECN | DSCP format */
  682 + *hc06_ptr = tmp;
  683 + hc06_ptr += 4;
  684 + }
  685 + }
  686 +
  687 + /* NOTE: payload length is always compressed */
  688 +
  689 + /* Next Header is compress if UDP */
  690 + if (hdr->nexthdr == UIP_PROTO_UDP)
  691 + iphc0 |= LOWPAN_IPHC_NH_C;
  692 +
  693 + if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
  694 + *hc06_ptr = hdr->nexthdr;
  695 + hc06_ptr += 1;
  696 + }
  697 +
  698 + /*
  699 + * Hop limit
  700 + * if 1: compress, encoding is 01
  701 + * if 64: compress, encoding is 10
  702 + * if 255: compress, encoding is 11
  703 + * else do not compress
  704 + */
  705 + switch (hdr->hop_limit) {
  706 + case 1:
  707 + iphc0 |= LOWPAN_IPHC_TTL_1;
  708 + break;
  709 + case 64:
  710 + iphc0 |= LOWPAN_IPHC_TTL_64;
  711 + break;
  712 + case 255:
  713 + iphc0 |= LOWPAN_IPHC_TTL_255;
  714 + break;
  715 + default:
  716 + *hc06_ptr = hdr->hop_limit;
  717 + hc06_ptr += 1;
  718 + break;
  719 + }
  720 +
  721 + /* source address compression */
  722 + if (is_addr_unspecified(&hdr->saddr)) {
  723 + pr_debug("source address is unspecified, setting SAC\n");
  724 + iphc1 |= LOWPAN_IPHC_SAC;
  725 + /* TODO: context lookup */
  726 + } else if (is_addr_link_local(&hdr->saddr)) {
  727 + iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
  728 + LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr);
  729 + pr_debug("source address unicast link-local %pI6c "
  730 + "iphc1 0x%02x\n", &hdr->saddr, iphc1);
  731 + } else {
  732 + pr_debug("send the full source address\n");
  733 + memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
  734 + hc06_ptr += 16;
  735 + }
  736 +
  737 + /* destination address compression */
  738 + if (is_addr_mcast(&hdr->daddr)) {
  739 + pr_debug("destination address is multicast: ");
  740 + iphc1 |= LOWPAN_IPHC_M;
  741 + if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
  742 + pr_debug("compressed to 1 octet\n");
  743 + iphc1 |= LOWPAN_IPHC_DAM_11;
  744 + /* use last byte */
  745 + *hc06_ptr = hdr->daddr.s6_addr[15];
  746 + hc06_ptr += 1;
  747 + } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
  748 + pr_debug("compressed to 4 octets\n");
  749 + iphc1 |= LOWPAN_IPHC_DAM_10;
  750 + /* second byte + the last three */
  751 + *hc06_ptr = hdr->daddr.s6_addr[1];
  752 + memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
  753 + hc06_ptr += 4;
  754 + } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
  755 + pr_debug("compressed to 6 octets\n");
  756 + iphc1 |= LOWPAN_IPHC_DAM_01;
  757 + /* second byte + the last five */
  758 + *hc06_ptr = hdr->daddr.s6_addr[1];
  759 + memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
  760 + hc06_ptr += 6;
  761 + } else {
  762 + pr_debug("using full address\n");
  763 + iphc1 |= LOWPAN_IPHC_DAM_00;
  764 + memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
  765 + hc06_ptr += 16;
  766 + }
  767 + } else {
  768 + /* TODO: context lookup */
  769 + if (is_addr_link_local(&hdr->daddr)) {
  770 + iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
  771 + LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr);
  772 + pr_debug("dest address unicast link-local %pI6c "
  773 + "iphc1 0x%02x\n", &hdr->daddr, iphc1);
  774 + } else {
  775 + pr_debug("dest address unicast %pI6c\n", &hdr->daddr);
  776 + memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
  777 + hc06_ptr += 16;
  778 + }
  779 + }
  780 +
  781 + /* UDP header compression */
  782 + if (hdr->nexthdr == UIP_PROTO_UDP)
  783 + compress_udp_header(&hc06_ptr, skb);
  784 +
  785 + head[0] = iphc0;
  786 + head[1] = iphc1;
  787 +
  788 + skb_pull(skb, sizeof(struct ipv6hdr));
  789 + skb_reset_transport_header(skb);
  790 + memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
  791 + skb_reset_network_header(skb);
  792 +
  793 + pr_debug("header len %d skb %u\n", (int)(hc06_ptr - head), skb->len);
  794 +
  795 + raw_dump_table(__func__, "raw skb data dump compressed",
  796 + skb->data, skb->len);
  797 + return 0;
  798 +}
  799 +EXPORT_SYMBOL_GPL(lowpan_header_compress);
  800 +
  801 +MODULE_LICENSE("GPL");
... ... @@ -214,6 +214,7 @@
214 214 source "net/x25/Kconfig"
215 215 source "net/lapb/Kconfig"
216 216 source "net/phonet/Kconfig"
  217 +source "net/6lowpan/Kconfig"
217 218 source "net/ieee802154/Kconfig"
218 219 source "net/mac802154/Kconfig"
219 220 source "net/sched/Kconfig"
... ... @@ -57,7 +57,8 @@
57 57 ifneq ($(CONFIG_DCB),)
58 58 obj-y += dcb/
59 59 endif
60   -obj-y += ieee802154/
  60 +obj-$(CONFIG_6LOWPAN) += 6lowpan/
  61 +obj-$(CONFIG_IEEE802154) += ieee802154/
61 62 obj-$(CONFIG_MAC802154) += mac802154/
62 63  
63 64 ifeq ($(CONFIG_NET),y)
net/bluetooth/Kconfig
Diff comments   View file @ 2c6bed7
... ... @@ -41,8 +41,7 @@
41 41  
42 42 config BT_6LOWPAN
43 43 tristate "Bluetooth 6LoWPAN support"
44   - depends on BT && IPV6
45   - select 6LOWPAN_IPHC if BT_6LOWPAN
  44 + depends on BT && 6LOWPAN
46 45 help
47 46 IPv6 compression over Bluetooth Low Energy.
48 47  
net/ieee802154/6lowpan_iphc.c
View file @ 2c6bed7
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>
55   -#include <linux/module.h>
56   -#include <linux/netdevice.h>
57   -#include <net/6lowpan.h>
58   -#include <net/ipv6.h>
59   -#include <net/af_ieee802154.h>
60   -
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   -{
268   - bool fail;
269   - u8 tmp = 0, val = 0;
270   -
271   - if (!uh)
272   - goto err;
273   -
274   - fail = lowpan_fetch_skb(skb, &tmp, 1);
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:
280   - fail |= lowpan_fetch_skb(skb, &uh->source, 2);
281   - fail |= lowpan_fetch_skb(skb, &uh->dest, 2);
282   - break;
283   - case LOWPAN_NHC_UDP_CS_P_01:
284   - fail |= lowpan_fetch_skb(skb, &uh->source, 2);
285   - fail |= lowpan_fetch_skb(skb, &val, 1);
286   - uh->dest = htons(val + LOWPAN_NHC_UDP_8BIT_PORT);
287   - break;
288   - case LOWPAN_NHC_UDP_CS_P_10:
289   - fail |= lowpan_fetch_skb(skb, &val, 1);
290   - uh->source = htons(val + LOWPAN_NHC_UDP_8BIT_PORT);
291   - fail |= lowpan_fetch_skb(skb, &uh->dest, 2);
292   - break;
293   - case LOWPAN_NHC_UDP_CS_P_11:
294   - fail |= lowpan_fetch_skb(skb, &val, 1);
295   - uh->source = htons(LOWPAN_NHC_UDP_4BIT_PORT +
296   - (val >> 4));
297   - uh->dest = htons(LOWPAN_NHC_UDP_4BIT_PORT +
298   - (val & 0x0f));
299   - break;
300   - default:
301   - pr_debug("ERROR: unknown UDP format\n");
302   - goto err;
303   - break;
304   - }
305   -
306   - pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
307   - ntohs(uh->source), ntohs(uh->dest));
308   -
309   - /* checksum */
310   - if (tmp & LOWPAN_NHC_UDP_CS_C) {
311   - pr_debug_ratelimited("checksum elided currently not supported\n");
312   - goto err;
313   - } else {
314   - fail |= lowpan_fetch_skb(skb, &uh->check, 2);
315   - }
316   -
317   - /*
318   - * UDP lenght needs to be infered from the lower layers
319   - * here, we obtain the hint from the remaining size of the
320   - * frame
321   - */
322   - uh->len = htons(skb->len + sizeof(struct udphdr));
323   - pr_debug("uncompressed UDP length: src = %d", ntohs(uh->len));
324   - } else {
325   - pr_debug("ERROR: unsupported NH format\n");
326   - goto err;
327   - }
328   -
329   - if (fail)
330   - goto err;
331   -
332   - return 0;
333   -err:
334   - return -EINVAL;
335   -}
336   -
337   -/* TTL uncompression values */
338   -static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 };
339   -
340   -int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
341   - const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
342   - const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
343   - u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb)
344   -{
345   - struct ipv6hdr hdr = {};
346   - u8 tmp, num_context = 0;
347   - int err;
348   -
349   - raw_dump_table(__func__, "raw skb data dump uncompressed",
350   - skb->data, skb->len);
351   -
352   - /* another if the CID flag is set */
353   - if (iphc1 & LOWPAN_IPHC_CID) {
354   - pr_debug("CID flag is set, increase header with one\n");
355   - if (lowpan_fetch_skb_u8(skb, &num_context))
356   - goto drop;
357   - }
358   -
359   - hdr.version = 6;
360   -
361   - /* Traffic Class and Flow Label */
362   - switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
363   - /*
364   - * Traffic Class and FLow Label carried in-line
365   - * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
366   - */
367   - case 0: /* 00b */
368   - if (lowpan_fetch_skb_u8(skb, &tmp))
369   - goto drop;
370   -
371   - memcpy(&hdr.flow_lbl, &skb->data[0], 3);
372   - skb_pull(skb, 3);
373   - hdr.priority = ((tmp >> 2) & 0x0f);
374   - hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
375   - (hdr.flow_lbl[0] & 0x0f);
376   - break;
377   - /*
378   - * Traffic class carried in-line
379   - * ECN + DSCP (1 byte), Flow Label is elided
380   - */
381   - case 2: /* 10b */
382   - if (lowpan_fetch_skb_u8(skb, &tmp))
383   - goto drop;
384   -
385   - hdr.priority = ((tmp >> 2) & 0x0f);
386   - hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
387   - break;
388   - /*
389   - * Flow Label carried in-line
390   - * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
391   - */
392   - case 1: /* 01b */
393   - if (lowpan_fetch_skb_u8(skb, &tmp))
394   - goto drop;
395   -
396   - hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
397   - memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
398   - skb_pull(skb, 2);
399   - break;
400   - /* Traffic Class and Flow Label are elided */
401   - case 3: /* 11b */
402   - break;
403   - default:
404   - break;
405   - }
406   -
407   - /* Next Header */
408   - if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
409   - /* Next header is carried inline */
410   - if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
411   - goto drop;
412   -
413   - pr_debug("NH flag is set, next header carried inline: %02x\n",
414   - hdr.nexthdr);
415   - }
416   -
417   - /* Hop Limit */
418   - if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
419   - hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
420   - else {
421   - if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
422   - goto drop;
423   - }
424   -
425   - /* Extract SAM to the tmp variable */
426   - tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
427   -
428   - if (iphc1 & LOWPAN_IPHC_SAC) {
429   - /* Source address context based uncompression */
430   - pr_debug("SAC bit is set. Handle context based source address.\n");
431   - err = uncompress_context_based_src_addr(
432   - skb, &hdr.saddr, tmp);
433   - } else {
434   - /* Source address uncompression */
435   - pr_debug("source address stateless compression\n");
436   - err = uncompress_addr(skb, &hdr.saddr, tmp, saddr,
437   - saddr_type, saddr_len);
438   - }
439   -
440   - /* Check on error of previous branch */
441   - if (err)
442   - goto drop;
443   -
444   - /* Extract DAM to the tmp variable */
445   - tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
446   -
447   - /* check for Multicast Compression */
448   - if (iphc1 & LOWPAN_IPHC_M) {
449   - if (iphc1 & LOWPAN_IPHC_DAC) {
450   - pr_debug("dest: context-based mcast compression\n");
451   - /* TODO: implement this */
452   - } else {
453   - err = lowpan_uncompress_multicast_daddr(
454   - skb, &hdr.daddr, tmp);
455   - if (err)
456   - goto drop;
457   - }
458   - } else {
459   - err = uncompress_addr(skb, &hdr.daddr, tmp, daddr,
460   - daddr_type, daddr_len);
461   - pr_debug("dest: stateless compression mode %d dest %pI6c\n",
462   - tmp, &hdr.daddr);
463   - if (err)
464   - goto drop;
465   - }
466   -
467   - /* UDP data uncompression */
468   - if (iphc0 & LOWPAN_IPHC_NH_C) {
469   - struct udphdr uh;
470   - struct sk_buff *new;
471   - if (uncompress_udp_header(skb, &uh))
472   - goto drop;
473   -
474   - /*
475   - * replace the compressed UDP head by the uncompressed UDP
476   - * header
477   - */
478   - new = skb_copy_expand(skb, sizeof(struct udphdr),
479   - skb_tailroom(skb), GFP_ATOMIC);
480   - kfree_skb(skb);
481   -
482   - if (!new)
483   - return -ENOMEM;
484   -
485   - skb = new;
486   -
487   - skb_push(skb, sizeof(struct udphdr));
488   - skb_reset_transport_header(skb);
489   - skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
490   -
491   - raw_dump_table(__func__, "raw UDP header dump",
492   - (u8 *)&uh, sizeof(uh));
493   -
494   - hdr.nexthdr = UIP_PROTO_UDP;
495   - }
496   -
497   - hdr.payload_len = htons(skb->len);
498   -
499   - pr_debug("skb headroom size = %d, data length = %d\n",
500   - skb_headroom(skb), skb->len);
501   -
502   - pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
503   - "nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
504   - hdr.version, ntohs(hdr.payload_len), hdr.nexthdr,
505   - hdr.hop_limit, &hdr.daddr);
506   -
507   - raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
508   - sizeof(hdr));
509   -
510   - return skb_deliver(skb, &hdr, dev, deliver_skb);
511   -
512   -drop:
513   - kfree_skb(skb);
514   - return -EINVAL;
515   -}
516   -EXPORT_SYMBOL_GPL(lowpan_process_data);
517   -
518   -static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift,
519   - const struct in6_addr *ipaddr,
520   - const unsigned char *lladdr)
521   -{
522   - u8 val = 0;
523   -
524   - if (is_addr_mac_addr_based(ipaddr, lladdr)) {
525   - val = 3; /* 0-bits */
526   - pr_debug("address compression 0 bits\n");
527   - } else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
528   - /* compress IID to 16 bits xxxx::XXXX */
529   - memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
530   - *hc06_ptr += 2;
531   - val = 2; /* 16-bits */
532   - raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
533   - *hc06_ptr - 2, 2);
534   - } else {
535   - /* do not compress IID => xxxx::IID */
536   - memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
537   - *hc06_ptr += 8;
538   - val = 1; /* 64-bits */
539   - raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
540   - *hc06_ptr - 8, 8);
541   - }
542   -
543   - return rol8(val, shift);
544   -}
545   -
546   -static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
547   -{
548   - struct udphdr *uh = udp_hdr(skb);
549   - u8 tmp;
550   -
551   - if (((ntohs(uh->source) & LOWPAN_NHC_UDP_4BIT_MASK) ==
552   - LOWPAN_NHC_UDP_4BIT_PORT) &&
553   - ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) ==
554   - LOWPAN_NHC_UDP_4BIT_PORT)) {
555   - pr_debug("UDP header: both ports compression to 4 bits\n");
556   - /* compression value */
557   - tmp = LOWPAN_NHC_UDP_CS_P_11;
558   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
559   - /* source and destination port */
560   - tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT +
561   - ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4);
562   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
563   - } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) ==
564   - LOWPAN_NHC_UDP_8BIT_PORT) {
565   - pr_debug("UDP header: remove 8 bits of dest\n");
566   - /* compression value */
567   - tmp = LOWPAN_NHC_UDP_CS_P_01;
568   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
569   - /* source port */
570   - lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source));
571   - /* destination port */
572   - tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT;
573   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
574   - } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) ==
575   - LOWPAN_NHC_UDP_8BIT_PORT) {
576   - pr_debug("UDP header: remove 8 bits of source\n");
577   - /* compression value */
578   - tmp = LOWPAN_NHC_UDP_CS_P_10;
579   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
580   - /* source port */
581   - tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT;
582   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
583   - /* destination port */
584   - lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest));
585   - } else {
586   - pr_debug("UDP header: can't compress\n");
587   - /* compression value */
588   - tmp = LOWPAN_NHC_UDP_CS_P_00;
589   - lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp));
590   - /* source port */
591   - lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source));
592   - /* destination port */
593   - lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest));
594   - }
595   -
596   - /* checksum is always inline */
597   - lowpan_push_hc_data(hc06_ptr, &uh->check, sizeof(uh->check));
598   -
599   - /* skip the UDP header */
600   - skb_pull(skb, sizeof(struct udphdr));
601   -}
602   -
603   -int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
604   - unsigned short type, const void *_daddr,
605   - const void *_saddr, unsigned int len)
606   -{
607   - u8 tmp, iphc0, iphc1, *hc06_ptr;
608   - struct ipv6hdr *hdr;
609   - u8 head[100] = {};
610   -
611   - if (type != ETH_P_IPV6)
612   - return -EINVAL;
613   -
614   - hdr = ipv6_hdr(skb);
615   - hc06_ptr = head + 2;
616   -
617   - pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
618   - "\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
619   - hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
620   - hdr->hop_limit, &hdr->daddr);
621   -
622   - raw_dump_table(__func__, "raw skb network header dump",
623   - skb_network_header(skb), sizeof(struct ipv6hdr));
624   -
625   - /*
626   - * As we copy some bit-length fields, in the IPHC encoding bytes,
627   - * we sometimes use |=
628   - * If the field is 0, and the current bit value in memory is 1,
629   - * this does not work. We therefore reset the IPHC encoding here
630   - */
631   - iphc0 = LOWPAN_DISPATCH_IPHC;
632   - iphc1 = 0;
633   -
634   - /* TODO: context lookup */
635   -
636   - raw_dump_inline(__func__, "saddr",
637   - (unsigned char *)_saddr, IEEE802154_ADDR_LEN);
638   - raw_dump_inline(__func__, "daddr",
639   - (unsigned char *)_daddr, IEEE802154_ADDR_LEN);
640   -
641   - raw_dump_table(__func__,
642   - "sending raw skb network uncompressed packet",
643   - skb->data, skb->len);
644   -
645   - /*
646   - * Traffic class, flow label
647   - * If flow label is 0, compress it. If traffic class is 0, compress it
648   - * We have to process both in the same time as the offset of traffic
649   - * class depends on the presence of version and flow label
650   - */
651   -
652   - /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
653   - tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
654   - tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
655   -
656   - if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
657   - (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
658   - /* flow label can be compressed */
659   - iphc0 |= LOWPAN_IPHC_FL_C;
660   - if ((hdr->priority == 0) &&
661   - ((hdr->flow_lbl[0] & 0xF0) == 0)) {
662   - /* compress (elide) all */
663   - iphc0 |= LOWPAN_IPHC_TC_C;
664   - } else {
665   - /* compress only the flow label */
666   - *hc06_ptr = tmp;
667   - hc06_ptr += 1;
668   - }
669   - } else {
670   - /* Flow label cannot be compressed */
671   - if ((hdr->priority == 0) &&
672   - ((hdr->flow_lbl[0] & 0xF0) == 0)) {
673   - /* compress only traffic class */
674   - iphc0 |= LOWPAN_IPHC_TC_C;
675   - *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
676   - memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
677   - hc06_ptr += 3;
678   - } else {
679   - /* compress nothing */
680   - memcpy(hc06_ptr, hdr, 4);
681   - /* replace the top byte with new ECN | DSCP format */
682   - *hc06_ptr = tmp;
683   - hc06_ptr += 4;
684   - }
685   - }
686   -
687   - /* NOTE: payload length is always compressed */
688   -
689   - /* Next Header is compress if UDP */
690   - if (hdr->nexthdr == UIP_PROTO_UDP)
691   - iphc0 |= LOWPAN_IPHC_NH_C;
692   -
693   - if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
694   - *hc06_ptr = hdr->nexthdr;
695   - hc06_ptr += 1;
696   - }
697   -
698   - /*
699   - * Hop limit
700   - * if 1: compress, encoding is 01
701   - * if 64: compress, encoding is 10
702   - * if 255: compress, encoding is 11
703   - * else do not compress
704   - */
705   - switch (hdr->hop_limit) {
706   - case 1:
707   - iphc0 |= LOWPAN_IPHC_TTL_1;
708   - break;
709   - case 64:
710   - iphc0 |= LOWPAN_IPHC_TTL_64;
711   - break;
712   - case 255:
713   - iphc0 |= LOWPAN_IPHC_TTL_255;
714   - break;
715   - default:
716   - *hc06_ptr = hdr->hop_limit;
717   - hc06_ptr += 1;
718   - break;
719   - }
720   -
721   - /* source address compression */
722   - if (is_addr_unspecified(&hdr->saddr)) {
723   - pr_debug("source address is unspecified, setting SAC\n");
724   - iphc1 |= LOWPAN_IPHC_SAC;
725   - /* TODO: context lookup */
726   - } else if (is_addr_link_local(&hdr->saddr)) {
727   - iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
728   - LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr);
729   - pr_debug("source address unicast link-local %pI6c "
730   - "iphc1 0x%02x\n", &hdr->saddr, iphc1);
731   - } else {
732   - pr_debug("send the full source address\n");
733   - memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
734   - hc06_ptr += 16;
735   - }
736   -
737   - /* destination address compression */
738   - if (is_addr_mcast(&hdr->daddr)) {
739   - pr_debug("destination address is multicast: ");
740   - iphc1 |= LOWPAN_IPHC_M;
741   - if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
742   - pr_debug("compressed to 1 octet\n");
743   - iphc1 |= LOWPAN_IPHC_DAM_11;
744   - /* use last byte */
745   - *hc06_ptr = hdr->daddr.s6_addr[15];
746   - hc06_ptr += 1;
747   - } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
748   - pr_debug("compressed to 4 octets\n");
749   - iphc1 |= LOWPAN_IPHC_DAM_10;
750   - /* second byte + the last three */
751   - *hc06_ptr = hdr->daddr.s6_addr[1];
752   - memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
753   - hc06_ptr += 4;
754   - } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
755   - pr_debug("compressed to 6 octets\n");
756   - iphc1 |= LOWPAN_IPHC_DAM_01;
757   - /* second byte + the last five */
758   - *hc06_ptr = hdr->daddr.s6_addr[1];
759   - memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
760   - hc06_ptr += 6;
761   - } else {
762   - pr_debug("using full address\n");
763   - iphc1 |= LOWPAN_IPHC_DAM_00;
764   - memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
765   - hc06_ptr += 16;
766   - }
767   - } else {
768   - /* TODO: context lookup */
769   - if (is_addr_link_local(&hdr->daddr)) {
770   - iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
771   - LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr);
772   - pr_debug("dest address unicast link-local %pI6c "
773   - "iphc1 0x%02x\n", &hdr->daddr, iphc1);
774   - } else {
775   - pr_debug("dest address unicast %pI6c\n", &hdr->daddr);
776   - memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
777   - hc06_ptr += 16;
778   - }
779   - }
780   -
781   - /* UDP header compression */
782   - if (hdr->nexthdr == UIP_PROTO_UDP)
783   - compress_udp_header(&hc06_ptr, skb);
784   -
785   - head[0] = iphc0;
786   - head[1] = iphc1;
787   -
788   - skb_pull(skb, sizeof(struct ipv6hdr));
789   - skb_reset_transport_header(skb);
790   - memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
791   - skb_reset_network_header(skb);
792   -
793   - pr_debug("header len %d skb %u\n", (int)(hc06_ptr - head), skb->len);
794   -
795   - raw_dump_table(__func__, "raw skb data dump compressed",
796   - skb->data, skb->len);
797   - return 0;
798   -}
799   -EXPORT_SYMBOL_GPL(lowpan_header_compress);
800   -
801   -MODULE_LICENSE("GPL");
net/ieee802154/Kconfig
Diff comments   View file @ 2c6bed7
... ... @@ -12,14 +12,7 @@
12 12  
13 13 config IEEE802154_6LOWPAN
14 14 tristate "6lowpan support over IEEE 802.15.4"
15   - depends on IEEE802154 && IPV6
16   - select 6LOWPAN_IPHC
  15 + depends on IEEE802154 && 6LOWPAN
17 16 ---help---
18 17 IPv6 compression over IEEE 802.15.4.
19   -
20   -config 6LOWPAN_IPHC
21   - tristate
22   - ---help---
23   - 6lowpan compression code which is shared between IEEE 802.15.4 and Bluetooth
24   - stacks.
net/ieee802154/Makefile
Diff comments   View file @ 2c6bed7
1 1 obj-$(CONFIG_IEEE802154) += ieee802154.o af_802154.o
2   -obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o
3   -obj-$(CONFIG_6LOWPAN_IPHC) += 6lowpan_iphc.o
  2 +obj-$(CONFIG_IEEE802154_6LOWPAN) += ieee802154_6lowpan.o
4 3  
5   -6lowpan-y := 6lowpan_rtnl.o reassembly.o
  4 +ieee802154_6lowpan-y := 6lowpan_rtnl.o reassembly.o
6 5 ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o \
7 6 header_ops.o
8 7 af_802154-y := af_ieee802154.o raw.o dgram.o