Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 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 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 53 | #include <linux/bitops.h> |
| 54 | #include <linux/if_arp.h> |
| 55 | #include <linux/module.h> |
| 56 | #include <linux/moduleparam.h> |
| 57 | #include <linux/netdevice.h> |
Danny Kukawka | cdf49c2 | 2012-02-22 02:36:39 +0000 | [diff] [blame] | 58 | #include <linux/etherdevice.h> |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 59 | #include <net/af_ieee802154.h> |
| 60 | #include <net/ieee802154.h> |
| 61 | #include <net/ieee802154_netdev.h> |
| 62 | #include <net/ipv6.h> |
| 63 | |
| 64 | #include "6lowpan.h" |
| 65 | |
| 66 | /* TTL uncompression values */ |
| 67 | static const u8 lowpan_ttl_values[] = {0, 1, 64, 255}; |
| 68 | |
| 69 | static LIST_HEAD(lowpan_devices); |
| 70 | |
| 71 | /* |
| 72 | * Uncompression of linklocal: |
| 73 | * 0 -> 16 bytes from packet |
| 74 | * 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet |
| 75 | * 2 -> 2 bytes from prefix - zeroes + 2 from packet |
| 76 | * 3 -> 2 bytes from prefix - infer 8 bytes from lladdr |
| 77 | * |
| 78 | * NOTE: => the uncompress function does change 0xf to 0x10 |
| 79 | * NOTE: 0x00 => no-autoconfig => unspecified |
| 80 | */ |
| 81 | static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20}; |
| 82 | |
| 83 | /* |
| 84 | * Uncompression of ctx-based: |
| 85 | * 0 -> 0 bits from packet [unspecified / reserved] |
| 86 | * 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet |
| 87 | * 2 -> 8 bytes from prefix - zeroes + 2 from packet |
| 88 | * 3 -> 8 bytes from prefix - infer 8 bytes from lladdr |
| 89 | */ |
| 90 | static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80}; |
| 91 | |
| 92 | /* |
| 93 | * Uncompression of ctx-base |
| 94 | * 0 -> 0 bits from packet |
| 95 | * 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet |
| 96 | * 2 -> 2 bytes from prefix - zeroes + 3 from packet |
| 97 | * 3 -> 2 bytes from prefix - infer 1 bytes from lladdr |
| 98 | */ |
| 99 | static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21}; |
| 100 | |
| 101 | /* Link local prefix */ |
| 102 | static const u8 lowpan_llprefix[] = {0xfe, 0x80}; |
| 103 | |
| 104 | /* private device info */ |
| 105 | struct lowpan_dev_info { |
| 106 | struct net_device *real_dev; /* real WPAN device ptr */ |
| 107 | struct mutex dev_list_mtx; /* mutex for list ops */ |
| 108 | }; |
| 109 | |
| 110 | struct lowpan_dev_record { |
| 111 | struct net_device *ldev; |
| 112 | struct list_head list; |
| 113 | }; |
| 114 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 115 | struct lowpan_fragment { |
| 116 | struct sk_buff *skb; /* skb to be assembled */ |
| 117 | spinlock_t lock; /* concurency lock */ |
| 118 | u16 length; /* length to be assemled */ |
| 119 | u32 bytes_rcv; /* bytes received */ |
| 120 | u16 tag; /* current fragment tag */ |
| 121 | struct timer_list timer; /* assembling timer */ |
| 122 | struct list_head list; /* fragments list */ |
| 123 | }; |
| 124 | |
| 125 | static unsigned short fragment_tag; |
| 126 | static LIST_HEAD(lowpan_fragments); |
| 127 | spinlock_t flist_lock; |
| 128 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 129 | static inline struct |
| 130 | lowpan_dev_info *lowpan_dev_info(const struct net_device *dev) |
| 131 | { |
| 132 | return netdev_priv(dev); |
| 133 | } |
| 134 | |
| 135 | static inline void lowpan_address_flip(u8 *src, u8 *dest) |
| 136 | { |
| 137 | int i; |
| 138 | for (i = 0; i < IEEE802154_ADDR_LEN; i++) |
| 139 | (dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i]; |
| 140 | } |
| 141 | |
| 142 | /* list of all 6lowpan devices, uses for package delivering */ |
| 143 | /* print data in line */ |
| 144 | static inline void lowpan_raw_dump_inline(const char *caller, char *msg, |
| 145 | unsigned char *buf, int len) |
| 146 | { |
| 147 | #ifdef DEBUG |
| 148 | if (msg) |
| 149 | pr_debug("(%s) %s: ", caller, msg); |
| 150 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, |
| 151 | 16, 1, buf, len, false); |
| 152 | #endif /* DEBUG */ |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * print data in a table format: |
| 157 | * |
| 158 | * addr: xx xx xx xx xx xx |
| 159 | * addr: xx xx xx xx xx xx |
| 160 | * ... |
| 161 | */ |
| 162 | static inline void lowpan_raw_dump_table(const char *caller, char *msg, |
| 163 | unsigned char *buf, int len) |
| 164 | { |
| 165 | #ifdef DEBUG |
| 166 | if (msg) |
| 167 | pr_debug("(%s) %s:\n", caller, msg); |
| 168 | print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET, |
| 169 | 16, 1, buf, len, false); |
| 170 | #endif /* DEBUG */ |
| 171 | } |
| 172 | |
| 173 | static u8 |
| 174 | lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr, |
| 175 | const unsigned char *lladdr) |
| 176 | { |
| 177 | u8 val = 0; |
| 178 | |
| 179 | if (is_addr_mac_addr_based(ipaddr, lladdr)) |
| 180 | val = 3; /* 0-bits */ |
| 181 | else if (lowpan_is_iid_16_bit_compressable(ipaddr)) { |
| 182 | /* compress IID to 16 bits xxxx::XXXX */ |
| 183 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2); |
| 184 | *hc06_ptr += 2; |
| 185 | val = 2; /* 16-bits */ |
| 186 | } else { |
| 187 | /* do not compress IID => xxxx::IID */ |
| 188 | memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8); |
| 189 | *hc06_ptr += 8; |
| 190 | val = 1; /* 64-bits */ |
| 191 | } |
| 192 | |
| 193 | return rol8(val, shift); |
| 194 | } |
| 195 | |
| 196 | static void |
| 197 | lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr) |
| 198 | { |
| 199 | memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ALEN); |
| 200 | /* second bit-flip (Universe/Local) is done according RFC2464 */ |
| 201 | ipaddr->s6_addr[8] ^= 0x02; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Uncompress addresses based on a prefix and a postfix with zeroes in |
| 206 | * between. If the postfix is zero in length it will use the link address |
| 207 | * to configure the IP address (autoconf style). |
| 208 | * pref_post_count takes a byte where the first nibble specify prefix count |
| 209 | * and the second postfix count (NOTE: 15/0xf => 16 bytes copy). |
| 210 | */ |
| 211 | static int |
| 212 | lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr, |
| 213 | u8 const *prefix, u8 pref_post_count, unsigned char *lladdr) |
| 214 | { |
| 215 | u8 prefcount = pref_post_count >> 4; |
| 216 | u8 postcount = pref_post_count & 0x0f; |
| 217 | |
| 218 | /* full nibble 15 => 16 */ |
| 219 | prefcount = (prefcount == 15 ? 16 : prefcount); |
| 220 | postcount = (postcount == 15 ? 16 : postcount); |
| 221 | |
| 222 | if (lladdr) |
| 223 | lowpan_raw_dump_inline(__func__, "linklocal address", |
| 224 | lladdr, IEEE802154_ALEN); |
| 225 | if (prefcount > 0) |
| 226 | memcpy(ipaddr, prefix, prefcount); |
| 227 | |
| 228 | if (prefcount + postcount < 16) |
| 229 | memset(&ipaddr->s6_addr[prefcount], 0, |
| 230 | 16 - (prefcount + postcount)); |
| 231 | |
| 232 | if (postcount > 0) { |
| 233 | memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount); |
| 234 | skb_pull(skb, postcount); |
| 235 | } else if (prefcount > 0) { |
| 236 | if (lladdr == NULL) |
| 237 | return -EINVAL; |
| 238 | |
| 239 | /* no IID based configuration if no prefix and no data */ |
| 240 | lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr); |
| 241 | } |
| 242 | |
| 243 | pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount, |
| 244 | postcount); |
| 245 | lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16); |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
alex.bluesman.smirnov@gmail.com | 3bd5b95 | 2011-11-10 07:40:14 +0000 | [diff] [blame] | 250 | static void |
| 251 | lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) |
| 252 | { |
| 253 | struct udphdr *uh = udp_hdr(skb); |
| 254 | |
| 255 | pr_debug("(%s): UDP header compression\n", __func__); |
| 256 | |
| 257 | if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) == |
| 258 | LOWPAN_NHC_UDP_4BIT_PORT) && |
| 259 | ((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) == |
| 260 | LOWPAN_NHC_UDP_4BIT_PORT)) { |
| 261 | pr_debug("(%s): both ports compression to 4 bits\n", __func__); |
| 262 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_11; |
| 263 | **(hc06_ptr + 1) = /* subtraction is faster */ |
| 264 | (u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) + |
| 265 | ((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4)); |
| 266 | *hc06_ptr += 2; |
| 267 | } else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) == |
| 268 | LOWPAN_NHC_UDP_8BIT_PORT) { |
| 269 | pr_debug("(%s): remove 8 bits of dest\n", __func__); |
| 270 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_01; |
| 271 | memcpy(*hc06_ptr + 1, &uh->source, 2); |
| 272 | **(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT); |
| 273 | *hc06_ptr += 4; |
| 274 | } else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) == |
| 275 | LOWPAN_NHC_UDP_8BIT_PORT) { |
| 276 | pr_debug("(%s): remove 8 bits of source\n", __func__); |
| 277 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_10; |
| 278 | memcpy(*hc06_ptr + 1, &uh->dest, 2); |
| 279 | **(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT); |
| 280 | *hc06_ptr += 4; |
| 281 | } else { |
| 282 | pr_debug("(%s): can't compress header\n", __func__); |
| 283 | **hc06_ptr = LOWPAN_NHC_UDP_CS_P_00; |
| 284 | memcpy(*hc06_ptr + 1, &uh->source, 2); |
| 285 | memcpy(*hc06_ptr + 3, &uh->dest, 2); |
| 286 | *hc06_ptr += 5; |
| 287 | } |
| 288 | |
| 289 | /* checksum is always inline */ |
| 290 | memcpy(*hc06_ptr, &uh->check, 2); |
| 291 | *hc06_ptr += 2; |
| 292 | } |
| 293 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 294 | static u8 lowpan_fetch_skb_u8(struct sk_buff *skb) |
| 295 | { |
| 296 | u8 ret; |
| 297 | |
| 298 | ret = skb->data[0]; |
| 299 | skb_pull(skb, 1); |
| 300 | |
| 301 | return ret; |
| 302 | } |
| 303 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 304 | static u16 lowpan_fetch_skb_u16(struct sk_buff *skb) |
| 305 | { |
| 306 | u16 ret; |
| 307 | |
| 308 | BUG_ON(!pskb_may_pull(skb, 2)); |
| 309 | |
| 310 | ret = skb->data[0] | (skb->data[1] << 8); |
| 311 | skb_pull(skb, 2); |
| 312 | return ret; |
| 313 | } |
| 314 | |
alex.bluesman.smirnov@gmail.com | f8b1b5d | 2011-11-10 07:40:53 +0000 | [diff] [blame] | 315 | static int |
| 316 | lowpan_uncompress_udp_header(struct sk_buff *skb) |
| 317 | { |
| 318 | struct udphdr *uh = udp_hdr(skb); |
| 319 | u8 tmp; |
| 320 | |
| 321 | tmp = lowpan_fetch_skb_u8(skb); |
| 322 | |
| 323 | if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { |
| 324 | pr_debug("(%s): UDP header uncompression\n", __func__); |
| 325 | switch (tmp & LOWPAN_NHC_UDP_CS_P_11) { |
| 326 | case LOWPAN_NHC_UDP_CS_P_00: |
| 327 | memcpy(&uh->source, &skb->data[0], 2); |
| 328 | memcpy(&uh->dest, &skb->data[2], 2); |
| 329 | skb_pull(skb, 4); |
| 330 | break; |
| 331 | case LOWPAN_NHC_UDP_CS_P_01: |
| 332 | memcpy(&uh->source, &skb->data[0], 2); |
| 333 | uh->dest = |
| 334 | skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT; |
| 335 | skb_pull(skb, 3); |
| 336 | break; |
| 337 | case LOWPAN_NHC_UDP_CS_P_10: |
| 338 | uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT; |
| 339 | memcpy(&uh->dest, &skb->data[1], 2); |
| 340 | skb_pull(skb, 3); |
| 341 | break; |
| 342 | case LOWPAN_NHC_UDP_CS_P_11: |
| 343 | uh->source = |
| 344 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4); |
| 345 | uh->dest = |
| 346 | LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f); |
| 347 | skb_pull(skb, 1); |
| 348 | break; |
| 349 | default: |
| 350 | pr_debug("(%s) ERROR: unknown UDP format\n", __func__); |
| 351 | goto err; |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n", |
| 356 | __func__, uh->source, uh->dest); |
| 357 | |
| 358 | /* copy checksum */ |
| 359 | memcpy(&uh->check, &skb->data[0], 2); |
| 360 | skb_pull(skb, 2); |
| 361 | } else { |
| 362 | pr_debug("(%s): ERROR: unsupported NH format\n", __func__); |
| 363 | goto err; |
| 364 | } |
| 365 | |
| 366 | return 0; |
| 367 | err: |
| 368 | return -EINVAL; |
| 369 | } |
| 370 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 371 | static int lowpan_header_create(struct sk_buff *skb, |
| 372 | struct net_device *dev, |
| 373 | unsigned short type, const void *_daddr, |
| 374 | const void *_saddr, unsigned len) |
| 375 | { |
| 376 | u8 tmp, iphc0, iphc1, *hc06_ptr; |
| 377 | struct ipv6hdr *hdr; |
| 378 | const u8 *saddr = _saddr; |
| 379 | const u8 *daddr = _daddr; |
| 380 | u8 *head; |
| 381 | struct ieee802154_addr sa, da; |
| 382 | |
| 383 | if (type != ETH_P_IPV6) |
| 384 | return 0; |
| 385 | /* TODO: |
| 386 | * if this package isn't ipv6 one, where should it be routed? |
| 387 | */ |
| 388 | head = kzalloc(100, GFP_KERNEL); |
| 389 | if (head == NULL) |
| 390 | return -ENOMEM; |
| 391 | |
| 392 | hdr = ipv6_hdr(skb); |
| 393 | hc06_ptr = head + 2; |
| 394 | |
| 395 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n" |
| 396 | "\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__, |
| 397 | hdr->version, ntohs(hdr->payload_len), hdr->nexthdr, |
| 398 | hdr->hop_limit); |
| 399 | |
| 400 | lowpan_raw_dump_table(__func__, "raw skb network header dump", |
| 401 | skb_network_header(skb), sizeof(struct ipv6hdr)); |
| 402 | |
| 403 | if (!saddr) |
| 404 | saddr = dev->dev_addr; |
| 405 | |
| 406 | lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); |
| 407 | |
| 408 | /* |
| 409 | * As we copy some bit-length fields, in the IPHC encoding bytes, |
| 410 | * we sometimes use |= |
| 411 | * If the field is 0, and the current bit value in memory is 1, |
| 412 | * this does not work. We therefore reset the IPHC encoding here |
| 413 | */ |
| 414 | iphc0 = LOWPAN_DISPATCH_IPHC; |
| 415 | iphc1 = 0; |
| 416 | |
| 417 | /* TODO: context lookup */ |
| 418 | |
| 419 | lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); |
| 420 | |
| 421 | /* |
| 422 | * Traffic class, flow label |
| 423 | * If flow label is 0, compress it. If traffic class is 0, compress it |
| 424 | * We have to process both in the same time as the offset of traffic |
| 425 | * class depends on the presence of version and flow label |
| 426 | */ |
| 427 | |
| 428 | /* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */ |
| 429 | tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4); |
| 430 | tmp = ((tmp & 0x03) << 6) | (tmp >> 2); |
| 431 | |
| 432 | if (((hdr->flow_lbl[0] & 0x0F) == 0) && |
| 433 | (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) { |
| 434 | /* flow label can be compressed */ |
| 435 | iphc0 |= LOWPAN_IPHC_FL_C; |
| 436 | if ((hdr->priority == 0) && |
| 437 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
| 438 | /* compress (elide) all */ |
| 439 | iphc0 |= LOWPAN_IPHC_TC_C; |
| 440 | } else { |
| 441 | /* compress only the flow label */ |
| 442 | *hc06_ptr = tmp; |
| 443 | hc06_ptr += 1; |
| 444 | } |
| 445 | } else { |
| 446 | /* Flow label cannot be compressed */ |
| 447 | if ((hdr->priority == 0) && |
| 448 | ((hdr->flow_lbl[0] & 0xF0) == 0)) { |
| 449 | /* compress only traffic class */ |
| 450 | iphc0 |= LOWPAN_IPHC_TC_C; |
| 451 | *hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F); |
| 452 | memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2); |
| 453 | hc06_ptr += 3; |
| 454 | } else { |
| 455 | /* compress nothing */ |
| 456 | memcpy(hc06_ptr, &hdr, 4); |
| 457 | /* replace the top byte with new ECN | DSCP format */ |
| 458 | *hc06_ptr = tmp; |
| 459 | hc06_ptr += 4; |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | /* NOTE: payload length is always compressed */ |
| 464 | |
| 465 | /* Next Header is compress if UDP */ |
| 466 | if (hdr->nexthdr == UIP_PROTO_UDP) |
| 467 | iphc0 |= LOWPAN_IPHC_NH_C; |
| 468 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 469 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
| 470 | *hc06_ptr = hdr->nexthdr; |
| 471 | hc06_ptr += 1; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Hop limit |
| 476 | * if 1: compress, encoding is 01 |
| 477 | * if 64: compress, encoding is 10 |
| 478 | * if 255: compress, encoding is 11 |
| 479 | * else do not compress |
| 480 | */ |
| 481 | switch (hdr->hop_limit) { |
| 482 | case 1: |
| 483 | iphc0 |= LOWPAN_IPHC_TTL_1; |
| 484 | break; |
| 485 | case 64: |
| 486 | iphc0 |= LOWPAN_IPHC_TTL_64; |
| 487 | break; |
| 488 | case 255: |
| 489 | iphc0 |= LOWPAN_IPHC_TTL_255; |
| 490 | break; |
| 491 | default: |
| 492 | *hc06_ptr = hdr->hop_limit; |
| 493 | break; |
| 494 | } |
| 495 | |
| 496 | /* source address compression */ |
| 497 | if (is_addr_unspecified(&hdr->saddr)) { |
| 498 | pr_debug("(%s): source address is unspecified, setting SAC\n", |
| 499 | __func__); |
| 500 | iphc1 |= LOWPAN_IPHC_SAC; |
| 501 | /* TODO: context lookup */ |
| 502 | } else if (is_addr_link_local(&hdr->saddr)) { |
| 503 | pr_debug("(%s): source address is link-local\n", __func__); |
| 504 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
| 505 | LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr); |
| 506 | } else { |
| 507 | pr_debug("(%s): send the full source address\n", __func__); |
| 508 | memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16); |
| 509 | hc06_ptr += 16; |
| 510 | } |
| 511 | |
| 512 | /* destination address compression */ |
| 513 | if (is_addr_mcast(&hdr->daddr)) { |
| 514 | pr_debug("(%s): destination address is multicast", __func__); |
| 515 | iphc1 |= LOWPAN_IPHC_M; |
| 516 | if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) { |
| 517 | pr_debug("compressed to 1 octet\n"); |
| 518 | iphc1 |= LOWPAN_IPHC_DAM_11; |
| 519 | /* use last byte */ |
| 520 | *hc06_ptr = hdr->daddr.s6_addr[15]; |
| 521 | hc06_ptr += 1; |
| 522 | } else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) { |
| 523 | pr_debug("compressed to 4 octets\n"); |
| 524 | iphc1 |= LOWPAN_IPHC_DAM_10; |
| 525 | /* second byte + the last three */ |
| 526 | *hc06_ptr = hdr->daddr.s6_addr[1]; |
| 527 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3); |
| 528 | hc06_ptr += 4; |
| 529 | } else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) { |
| 530 | pr_debug("compressed to 6 octets\n"); |
| 531 | iphc1 |= LOWPAN_IPHC_DAM_01; |
| 532 | /* second byte + the last five */ |
| 533 | *hc06_ptr = hdr->daddr.s6_addr[1]; |
| 534 | memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5); |
| 535 | hc06_ptr += 6; |
| 536 | } else { |
| 537 | pr_debug("using full address\n"); |
| 538 | iphc1 |= LOWPAN_IPHC_DAM_00; |
| 539 | memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16); |
| 540 | hc06_ptr += 16; |
| 541 | } |
| 542 | } else { |
| 543 | pr_debug("(%s): destination address is unicast: ", __func__); |
| 544 | /* TODO: context lookup */ |
| 545 | if (is_addr_link_local(&hdr->daddr)) { |
| 546 | pr_debug("destination address is link-local\n"); |
| 547 | iphc1 |= lowpan_compress_addr_64(&hc06_ptr, |
| 548 | LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr); |
| 549 | } else { |
| 550 | pr_debug("using full address\n"); |
| 551 | memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16); |
| 552 | hc06_ptr += 16; |
| 553 | } |
| 554 | } |
| 555 | |
alex.bluesman.smirnov@gmail.com | 3bd5b95 | 2011-11-10 07:40:14 +0000 | [diff] [blame] | 556 | /* UDP header compression */ |
| 557 | if (hdr->nexthdr == UIP_PROTO_UDP) |
| 558 | lowpan_compress_udp_header(&hc06_ptr, skb); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 559 | |
| 560 | head[0] = iphc0; |
| 561 | head[1] = iphc1; |
| 562 | |
| 563 | skb_pull(skb, sizeof(struct ipv6hdr)); |
| 564 | memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head); |
| 565 | |
| 566 | kfree(head); |
| 567 | |
| 568 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, |
| 569 | skb->len); |
| 570 | |
| 571 | /* |
| 572 | * NOTE1: I'm still unsure about the fact that compression and WPAN |
| 573 | * header are created here and not later in the xmit. So wait for |
| 574 | * an opinion of net maintainers. |
| 575 | */ |
| 576 | /* |
| 577 | * NOTE2: to be absolutely correct, we must derive PANid information |
| 578 | * from MAC subif of the 'dev' and 'real_dev' network devices, but |
| 579 | * this isn't implemented in mainline yet, so currently we assign 0xff |
| 580 | */ |
| 581 | { |
| 582 | /* prepare wpan address data */ |
| 583 | sa.addr_type = IEEE802154_ADDR_LONG; |
| 584 | sa.pan_id = 0xff; |
| 585 | |
| 586 | da.addr_type = IEEE802154_ADDR_LONG; |
| 587 | da.pan_id = 0xff; |
| 588 | |
| 589 | memcpy(&(da.hwaddr), daddr, 8); |
| 590 | memcpy(&(sa.hwaddr), saddr, 8); |
| 591 | |
| 592 | mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 593 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 594 | return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev, |
| 595 | type, (void *)&da, (void *)&sa, skb->len); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr) |
| 600 | { |
| 601 | struct sk_buff *new; |
| 602 | struct lowpan_dev_record *entry; |
| 603 | int stat = NET_RX_SUCCESS; |
| 604 | |
| 605 | new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb), |
alex.bluesman.smirnov@gmail.com | dcef115 | 2011-09-01 03:55:15 +0000 | [diff] [blame] | 606 | GFP_ATOMIC); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 607 | kfree_skb(skb); |
| 608 | |
alex.bluesman.smirnov@gmail.com | dcef115 | 2011-09-01 03:55:15 +0000 | [diff] [blame] | 609 | if (!new) |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 610 | return -ENOMEM; |
| 611 | |
| 612 | skb_push(new, sizeof(struct ipv6hdr)); |
| 613 | skb_reset_network_header(new); |
| 614 | skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr)); |
| 615 | |
| 616 | new->protocol = htons(ETH_P_IPV6); |
| 617 | new->pkt_type = PACKET_HOST; |
| 618 | |
| 619 | rcu_read_lock(); |
| 620 | list_for_each_entry_rcu(entry, &lowpan_devices, list) |
| 621 | if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) { |
alex.bluesman.smirnov@gmail.com | dcef115 | 2011-09-01 03:55:15 +0000 | [diff] [blame] | 622 | skb = skb_copy(new, GFP_ATOMIC); |
| 623 | if (!skb) { |
| 624 | stat = -ENOMEM; |
| 625 | break; |
| 626 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 627 | |
alex.bluesman.smirnov@gmail.com | dcef115 | 2011-09-01 03:55:15 +0000 | [diff] [blame] | 628 | skb->dev = entry->ldev; |
| 629 | stat = netif_rx(skb); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 630 | } |
| 631 | rcu_read_unlock(); |
| 632 | |
| 633 | kfree_skb(new); |
| 634 | |
| 635 | return stat; |
| 636 | } |
| 637 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 638 | static void lowpan_fragment_timer_expired(unsigned long entry_addr) |
| 639 | { |
| 640 | struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr; |
| 641 | |
| 642 | pr_debug("%s: timer expired for frame with tag %d\n", __func__, |
| 643 | entry->tag); |
| 644 | |
| 645 | spin_lock(&flist_lock); |
| 646 | list_del(&entry->list); |
| 647 | spin_unlock(&flist_lock); |
| 648 | |
| 649 | dev_kfree_skb(entry->skb); |
| 650 | kfree(entry); |
| 651 | } |
| 652 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 653 | static int |
| 654 | lowpan_process_data(struct sk_buff *skb) |
| 655 | { |
| 656 | struct ipv6hdr hdr; |
| 657 | u8 tmp, iphc0, iphc1, num_context = 0; |
| 658 | u8 *_saddr, *_daddr; |
| 659 | int err; |
| 660 | |
| 661 | lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data, |
| 662 | skb->len); |
| 663 | /* at least two bytes will be used for the encoding */ |
| 664 | if (skb->len < 2) |
| 665 | goto drop; |
| 666 | iphc0 = lowpan_fetch_skb_u8(skb); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 667 | |
| 668 | /* fragments assembling */ |
| 669 | switch (iphc0 & LOWPAN_DISPATCH_MASK) { |
| 670 | case LOWPAN_DISPATCH_FRAG1: |
| 671 | case LOWPAN_DISPATCH_FRAGN: |
| 672 | { |
| 673 | struct lowpan_fragment *frame; |
| 674 | u8 len, offset; |
| 675 | u16 tag; |
| 676 | bool found = false; |
| 677 | |
| 678 | len = lowpan_fetch_skb_u8(skb); /* frame length */ |
| 679 | tag = lowpan_fetch_skb_u16(skb); |
| 680 | |
| 681 | /* |
| 682 | * check if frame assembling with the same tag is |
| 683 | * already in progress |
| 684 | */ |
| 685 | spin_lock(&flist_lock); |
| 686 | |
| 687 | list_for_each_entry(frame, &lowpan_fragments, list) |
| 688 | if (frame->tag == tag) { |
| 689 | found = true; |
| 690 | break; |
| 691 | } |
| 692 | |
| 693 | /* alloc new frame structure */ |
| 694 | if (!found) { |
| 695 | frame = kzalloc(sizeof(struct lowpan_fragment), |
| 696 | GFP_ATOMIC); |
| 697 | if (!frame) |
| 698 | goto unlock_and_drop; |
| 699 | |
| 700 | INIT_LIST_HEAD(&frame->list); |
| 701 | |
| 702 | frame->length = (iphc0 & 7) | (len << 3); |
| 703 | frame->tag = tag; |
| 704 | |
| 705 | /* allocate buffer for frame assembling */ |
| 706 | frame->skb = alloc_skb(frame->length + |
| 707 | sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 708 | |
| 709 | if (!frame->skb) { |
| 710 | kfree(frame); |
| 711 | goto unlock_and_drop; |
| 712 | } |
| 713 | |
| 714 | frame->skb->priority = skb->priority; |
| 715 | frame->skb->dev = skb->dev; |
| 716 | |
| 717 | /* reserve headroom for uncompressed ipv6 header */ |
| 718 | skb_reserve(frame->skb, sizeof(struct ipv6hdr)); |
| 719 | skb_put(frame->skb, frame->length); |
| 720 | |
| 721 | init_timer(&frame->timer); |
| 722 | /* time out is the same as for ipv6 - 60 sec */ |
| 723 | frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT; |
| 724 | frame->timer.data = (unsigned long)frame; |
| 725 | frame->timer.function = lowpan_fragment_timer_expired; |
| 726 | |
| 727 | add_timer(&frame->timer); |
| 728 | |
| 729 | list_add_tail(&frame->list, &lowpan_fragments); |
| 730 | } |
| 731 | |
| 732 | if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) |
| 733 | goto unlock_and_drop; |
| 734 | |
| 735 | offset = lowpan_fetch_skb_u8(skb); /* fetch offset */ |
| 736 | |
| 737 | /* if payload fits buffer, copy it */ |
| 738 | if (likely((offset * 8 + skb->len) <= frame->length)) |
| 739 | skb_copy_to_linear_data_offset(frame->skb, offset * 8, |
| 740 | skb->data, skb->len); |
| 741 | else |
| 742 | goto unlock_and_drop; |
| 743 | |
| 744 | frame->bytes_rcv += skb->len; |
| 745 | |
| 746 | /* frame assembling complete */ |
| 747 | if ((frame->bytes_rcv == frame->length) && |
| 748 | frame->timer.expires > jiffies) { |
| 749 | /* if timer haven't expired - first of all delete it */ |
| 750 | del_timer(&frame->timer); |
| 751 | list_del(&frame->list); |
| 752 | spin_unlock(&flist_lock); |
| 753 | |
| 754 | dev_kfree_skb(skb); |
| 755 | skb = frame->skb; |
| 756 | kfree(frame); |
| 757 | iphc0 = lowpan_fetch_skb_u8(skb); |
| 758 | break; |
| 759 | } |
| 760 | spin_unlock(&flist_lock); |
| 761 | |
| 762 | return kfree_skb(skb), 0; |
| 763 | } |
| 764 | default: |
| 765 | break; |
| 766 | } |
| 767 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 768 | iphc1 = lowpan_fetch_skb_u8(skb); |
| 769 | |
| 770 | _saddr = mac_cb(skb)->sa.hwaddr; |
| 771 | _daddr = mac_cb(skb)->da.hwaddr; |
| 772 | |
| 773 | pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1); |
| 774 | |
| 775 | /* another if the CID flag is set */ |
| 776 | if (iphc1 & LOWPAN_IPHC_CID) { |
| 777 | pr_debug("(%s): CID flag is set, increase header with one\n", |
| 778 | __func__); |
| 779 | if (!skb->len) |
| 780 | goto drop; |
| 781 | num_context = lowpan_fetch_skb_u8(skb); |
| 782 | } |
| 783 | |
| 784 | hdr.version = 6; |
| 785 | |
| 786 | /* Traffic Class and Flow Label */ |
| 787 | switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { |
| 788 | /* |
| 789 | * Traffic Class and FLow Label carried in-line |
| 790 | * ECN + DSCP + 4-bit Pad + Flow Label (4 bytes) |
| 791 | */ |
| 792 | case 0: /* 00b */ |
| 793 | if (!skb->len) |
| 794 | goto drop; |
| 795 | tmp = lowpan_fetch_skb_u8(skb); |
| 796 | memcpy(&hdr.flow_lbl, &skb->data[0], 3); |
| 797 | skb_pull(skb, 3); |
| 798 | hdr.priority = ((tmp >> 2) & 0x0f); |
| 799 | hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) | |
| 800 | (hdr.flow_lbl[0] & 0x0f); |
| 801 | break; |
| 802 | /* |
| 803 | * Traffic class carried in-line |
| 804 | * ECN + DSCP (1 byte), Flow Label is elided |
| 805 | */ |
| 806 | case 1: /* 10b */ |
| 807 | if (!skb->len) |
| 808 | goto drop; |
| 809 | tmp = lowpan_fetch_skb_u8(skb); |
| 810 | hdr.priority = ((tmp >> 2) & 0x0f); |
| 811 | hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30); |
| 812 | hdr.flow_lbl[1] = 0; |
| 813 | hdr.flow_lbl[2] = 0; |
| 814 | break; |
| 815 | /* |
| 816 | * Flow Label carried in-line |
| 817 | * ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided |
| 818 | */ |
| 819 | case 2: /* 01b */ |
| 820 | if (!skb->len) |
| 821 | goto drop; |
| 822 | tmp = lowpan_fetch_skb_u8(skb); |
| 823 | hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30); |
| 824 | memcpy(&hdr.flow_lbl[1], &skb->data[0], 2); |
| 825 | skb_pull(skb, 2); |
| 826 | break; |
| 827 | /* Traffic Class and Flow Label are elided */ |
| 828 | case 3: /* 11b */ |
| 829 | hdr.priority = 0; |
| 830 | hdr.flow_lbl[0] = 0; |
| 831 | hdr.flow_lbl[1] = 0; |
| 832 | hdr.flow_lbl[2] = 0; |
| 833 | break; |
| 834 | default: |
| 835 | break; |
| 836 | } |
| 837 | |
| 838 | /* Next Header */ |
| 839 | if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) { |
| 840 | /* Next header is carried inline */ |
| 841 | if (!skb->len) |
| 842 | goto drop; |
| 843 | hdr.nexthdr = lowpan_fetch_skb_u8(skb); |
| 844 | pr_debug("(%s): NH flag is set, next header is carried " |
| 845 | "inline: %02x\n", __func__, hdr.nexthdr); |
| 846 | } |
| 847 | |
| 848 | /* Hop Limit */ |
| 849 | if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) |
| 850 | hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03]; |
| 851 | else { |
| 852 | if (!skb->len) |
| 853 | goto drop; |
| 854 | hdr.hop_limit = lowpan_fetch_skb_u8(skb); |
| 855 | } |
| 856 | |
| 857 | /* Extract SAM to the tmp variable */ |
| 858 | tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03; |
| 859 | |
| 860 | /* Source address uncompression */ |
| 861 | pr_debug("(%s): source address stateless compression\n", __func__); |
| 862 | err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix, |
| 863 | lowpan_unc_llconf[tmp], skb->data); |
| 864 | if (err) |
| 865 | goto drop; |
| 866 | |
| 867 | /* Extract DAM to the tmp variable */ |
| 868 | tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03; |
| 869 | |
| 870 | /* check for Multicast Compression */ |
| 871 | if (iphc1 & LOWPAN_IPHC_M) { |
| 872 | if (iphc1 & LOWPAN_IPHC_DAC) { |
| 873 | pr_debug("(%s): destination address context-based " |
| 874 | "multicast compression\n", __func__); |
| 875 | /* TODO: implement this */ |
| 876 | } else { |
| 877 | u8 prefix[] = {0xff, 0x02}; |
| 878 | |
| 879 | pr_debug("(%s): destination address non-context-based" |
| 880 | " multicast compression\n", __func__); |
| 881 | if (0 < tmp && tmp < 3) { |
| 882 | if (!skb->len) |
| 883 | goto drop; |
| 884 | else |
| 885 | prefix[1] = lowpan_fetch_skb_u8(skb); |
| 886 | } |
| 887 | |
| 888 | err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix, |
| 889 | lowpan_unc_mxconf[tmp], NULL); |
| 890 | if (err) |
| 891 | goto drop; |
| 892 | } |
| 893 | } else { |
| 894 | pr_debug("(%s): destination address stateless compression\n", |
| 895 | __func__); |
| 896 | err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix, |
| 897 | lowpan_unc_llconf[tmp], skb->data); |
| 898 | if (err) |
| 899 | goto drop; |
| 900 | } |
| 901 | |
alex.bluesman.smirnov@gmail.com | f8b1b5d | 2011-11-10 07:40:53 +0000 | [diff] [blame] | 902 | /* UDP data uncompression */ |
| 903 | if (iphc0 & LOWPAN_IPHC_NH_C) |
| 904 | if (lowpan_uncompress_udp_header(skb)) |
| 905 | goto drop; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 906 | |
| 907 | /* Not fragmented package */ |
| 908 | hdr.payload_len = htons(skb->len); |
| 909 | |
| 910 | pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__, |
| 911 | skb_headroom(skb), skb->len); |
| 912 | |
| 913 | pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t" |
| 914 | "nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version, |
| 915 | ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit); |
| 916 | |
| 917 | lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, |
| 918 | sizeof(hdr)); |
| 919 | return lowpan_skb_deliver(skb, &hdr); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 920 | |
| 921 | unlock_and_drop: |
| 922 | spin_unlock(&flist_lock); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 923 | drop: |
Dan Carpenter | 90d0963 | 2011-08-30 03:45:52 +0000 | [diff] [blame] | 924 | kfree_skb(skb); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 925 | return -EINVAL; |
| 926 | } |
| 927 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 928 | static int lowpan_get_mac_header_length(struct sk_buff *skb) |
| 929 | { |
| 930 | /* |
| 931 | * Currently long addressing mode is supported only, so the overall |
| 932 | * header size is 21: |
| 933 | * FC SeqNum DPAN DA SA Sec |
| 934 | * 2 + 1 + 2 + 8 + 8 + 0 = 21 |
| 935 | */ |
| 936 | return 21; |
| 937 | } |
| 938 | |
| 939 | static int |
| 940 | lowpan_fragment_xmit(struct sk_buff *skb, u8 *head, |
| 941 | int mlen, int plen, int offset) |
| 942 | { |
| 943 | struct sk_buff *frag; |
| 944 | int hlen, ret; |
| 945 | |
| 946 | /* if payload length is zero, therefore it's a first fragment */ |
| 947 | hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE); |
| 948 | |
| 949 | lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen); |
| 950 | |
| 951 | frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE); |
| 952 | if (!frag) |
| 953 | return -ENOMEM; |
| 954 | |
| 955 | frag->priority = skb->priority; |
| 956 | frag->dev = skb->dev; |
| 957 | |
| 958 | /* copy header, MFR and payload */ |
| 959 | memcpy(skb_put(frag, mlen), skb->data, mlen); |
| 960 | memcpy(skb_put(frag, hlen), head, hlen); |
| 961 | |
| 962 | if (plen) |
| 963 | skb_copy_from_linear_data_offset(skb, offset + mlen, |
| 964 | skb_put(frag, plen), plen); |
| 965 | |
| 966 | lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data, |
| 967 | frag->len); |
| 968 | |
| 969 | ret = dev_queue_xmit(frag); |
| 970 | |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 971 | return ret; |
| 972 | } |
| 973 | |
| 974 | static int |
| 975 | lowpan_skb_fragmentation(struct sk_buff *skb) |
| 976 | { |
| 977 | int err, header_length, payload_length, tag, offset = 0; |
| 978 | u8 head[5]; |
| 979 | |
| 980 | header_length = lowpan_get_mac_header_length(skb); |
| 981 | payload_length = skb->len - header_length; |
| 982 | tag = fragment_tag++; |
| 983 | |
| 984 | /* first fragment header */ |
| 985 | head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7); |
| 986 | head[1] = (payload_length >> 3) & 0xff; |
| 987 | head[2] = tag & 0xff; |
| 988 | head[3] = tag >> 8; |
| 989 | |
| 990 | err = lowpan_fragment_xmit(skb, head, header_length, 0, 0); |
| 991 | |
| 992 | /* next fragment header */ |
| 993 | head[0] &= ~LOWPAN_DISPATCH_FRAG1; |
| 994 | head[0] |= LOWPAN_DISPATCH_FRAGN; |
| 995 | |
| 996 | while ((payload_length - offset > 0) && (err >= 0)) { |
| 997 | int len = LOWPAN_FRAG_SIZE; |
| 998 | |
| 999 | head[4] = offset / 8; |
| 1000 | |
| 1001 | if (payload_length - offset < len) |
| 1002 | len = payload_length - offset; |
| 1003 | |
| 1004 | err = lowpan_fragment_xmit(skb, head, header_length, |
| 1005 | len, offset); |
| 1006 | offset += len; |
| 1007 | } |
| 1008 | |
| 1009 | return err; |
| 1010 | } |
| 1011 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1012 | static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1013 | { |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 1014 | int err = -1; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1015 | |
| 1016 | pr_debug("(%s): package xmit\n", __func__); |
| 1017 | |
| 1018 | skb->dev = lowpan_dev_info(dev)->real_dev; |
| 1019 | if (skb->dev == NULL) { |
| 1020 | pr_debug("(%s) ERROR: no real wpan device found\n", __func__); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 1021 | goto error; |
| 1022 | } |
| 1023 | |
| 1024 | if (skb->len <= IEEE802154_MTU) { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1025 | err = dev_queue_xmit(skb); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 1026 | goto out; |
| 1027 | } |
| 1028 | |
| 1029 | pr_debug("(%s): frame is too big, fragmentation is needed\n", |
| 1030 | __func__); |
| 1031 | err = lowpan_skb_fragmentation(skb); |
| 1032 | error: |
| 1033 | dev_kfree_skb(skb); |
| 1034 | out: |
| 1035 | if (err < 0) |
| 1036 | pr_debug("(%s): ERROR: xmit failed\n", __func__); |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1037 | |
| 1038 | return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK); |
| 1039 | } |
| 1040 | |
| 1041 | static void lowpan_dev_free(struct net_device *dev) |
| 1042 | { |
| 1043 | dev_put(lowpan_dev_info(dev)->real_dev); |
| 1044 | free_netdev(dev); |
| 1045 | } |
| 1046 | |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 1047 | static struct wpan_phy *lowpan_get_phy(const struct net_device *dev) |
| 1048 | { |
| 1049 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 1050 | return ieee802154_mlme_ops(real_dev)->get_phy(real_dev); |
| 1051 | } |
| 1052 | |
| 1053 | static u16 lowpan_get_pan_id(const struct net_device *dev) |
| 1054 | { |
| 1055 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 1056 | return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev); |
| 1057 | } |
| 1058 | |
| 1059 | static u16 lowpan_get_short_addr(const struct net_device *dev) |
| 1060 | { |
| 1061 | struct net_device *real_dev = lowpan_dev_info(dev)->real_dev; |
| 1062 | return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev); |
| 1063 | } |
| 1064 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1065 | static struct header_ops lowpan_header_ops = { |
| 1066 | .create = lowpan_header_create, |
| 1067 | }; |
| 1068 | |
| 1069 | static const struct net_device_ops lowpan_netdev_ops = { |
| 1070 | .ndo_start_xmit = lowpan_xmit, |
Danny Kukawka | cdf49c2 | 2012-02-22 02:36:39 +0000 | [diff] [blame] | 1071 | .ndo_set_mac_address = eth_mac_addr, |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1072 | }; |
| 1073 | |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 1074 | static struct ieee802154_mlme_ops lowpan_mlme = { |
| 1075 | .get_pan_id = lowpan_get_pan_id, |
| 1076 | .get_phy = lowpan_get_phy, |
| 1077 | .get_short_addr = lowpan_get_short_addr, |
| 1078 | }; |
| 1079 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1080 | static void lowpan_setup(struct net_device *dev) |
| 1081 | { |
| 1082 | pr_debug("(%s)\n", __func__); |
| 1083 | |
| 1084 | dev->addr_len = IEEE802154_ADDR_LEN; |
| 1085 | memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN); |
| 1086 | dev->type = ARPHRD_IEEE802154; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1087 | /* Frame Control + Sequence Number + Address fields + Security Header */ |
| 1088 | dev->hard_header_len = 2 + 1 + 20 + 14; |
| 1089 | dev->needed_tailroom = 2; /* FCS */ |
| 1090 | dev->mtu = 1281; |
| 1091 | dev->tx_queue_len = 0; |
alex.bluesman.smirnov@gmail.com | 4d039f6 | 2011-11-10 07:39:37 +0000 | [diff] [blame] | 1092 | dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1093 | dev->watchdog_timeo = 0; |
| 1094 | |
| 1095 | dev->netdev_ops = &lowpan_netdev_ops; |
| 1096 | dev->header_ops = &lowpan_header_ops; |
alex.bluesman.smirnov@gmail.com | 0848e40 | 2012-04-25 23:24:56 +0000 | [diff] [blame] | 1097 | dev->ml_priv = &lowpan_mlme; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1098 | dev->destructor = lowpan_dev_free; |
| 1099 | } |
| 1100 | |
| 1101 | static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 1102 | { |
| 1103 | pr_debug("(%s)\n", __func__); |
| 1104 | |
| 1105 | if (tb[IFLA_ADDRESS]) { |
| 1106 | if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN) |
| 1107 | return -EINVAL; |
| 1108 | } |
| 1109 | return 0; |
| 1110 | } |
| 1111 | |
| 1112 | static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev, |
| 1113 | struct packet_type *pt, struct net_device *orig_dev) |
| 1114 | { |
| 1115 | if (!netif_running(dev)) |
| 1116 | goto drop; |
| 1117 | |
| 1118 | if (dev->type != ARPHRD_IEEE802154) |
| 1119 | goto drop; |
| 1120 | |
| 1121 | /* check that it's our buffer */ |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 1122 | switch (skb->data[0] & 0xe0) { |
| 1123 | case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */ |
| 1124 | case LOWPAN_DISPATCH_FRAG1: /* first fragment header */ |
| 1125 | case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */ |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1126 | lowpan_process_data(skb); |
alex.bluesman.smirnov@gmail.com | 719269a | 2011-11-10 07:38:38 +0000 | [diff] [blame] | 1127 | break; |
| 1128 | default: |
| 1129 | break; |
| 1130 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1131 | |
| 1132 | return NET_RX_SUCCESS; |
| 1133 | |
| 1134 | drop: |
| 1135 | kfree_skb(skb); |
| 1136 | return NET_RX_DROP; |
| 1137 | } |
| 1138 | |
| 1139 | static int lowpan_newlink(struct net *src_net, struct net_device *dev, |
| 1140 | struct nlattr *tb[], struct nlattr *data[]) |
| 1141 | { |
| 1142 | struct net_device *real_dev; |
| 1143 | struct lowpan_dev_record *entry; |
| 1144 | |
| 1145 | pr_debug("(%s)\n", __func__); |
| 1146 | |
| 1147 | if (!tb[IFLA_LINK]) |
| 1148 | return -EINVAL; |
| 1149 | /* find and hold real wpan device */ |
| 1150 | real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
| 1151 | if (!real_dev) |
| 1152 | return -ENODEV; |
| 1153 | |
| 1154 | lowpan_dev_info(dev)->real_dev = real_dev; |
| 1155 | mutex_init(&lowpan_dev_info(dev)->dev_list_mtx); |
| 1156 | |
| 1157 | entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL); |
Dan Carpenter | dc00fd4 | 2011-08-30 03:51:09 +0000 | [diff] [blame] | 1158 | if (!entry) { |
| 1159 | dev_put(real_dev); |
| 1160 | lowpan_dev_info(dev)->real_dev = NULL; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1161 | return -ENOMEM; |
Dan Carpenter | dc00fd4 | 2011-08-30 03:51:09 +0000 | [diff] [blame] | 1162 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1163 | |
| 1164 | entry->ldev = dev; |
| 1165 | |
| 1166 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 1167 | INIT_LIST_HEAD(&entry->list); |
| 1168 | list_add_tail(&entry->list, &lowpan_devices); |
| 1169 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 1170 | |
| 1171 | register_netdevice(dev); |
| 1172 | |
| 1173 | return 0; |
| 1174 | } |
| 1175 | |
| 1176 | static void lowpan_dellink(struct net_device *dev, struct list_head *head) |
| 1177 | { |
| 1178 | struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev); |
| 1179 | struct net_device *real_dev = lowpan_dev->real_dev; |
alex.bluesman.smirnov@gmail.com | 8deff4a | 2012-04-25 23:24:57 +0000 | [diff] [blame^] | 1180 | struct lowpan_dev_record *entry, *tmp; |
| 1181 | struct lowpan_fragment *frame, *tframe; |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1182 | |
| 1183 | ASSERT_RTNL(); |
| 1184 | |
alex.bluesman.smirnov@gmail.com | 8deff4a | 2012-04-25 23:24:57 +0000 | [diff] [blame^] | 1185 | spin_lock(&flist_lock); |
| 1186 | list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) { |
| 1187 | del_timer(&frame->timer); |
| 1188 | list_del(&frame->list); |
| 1189 | dev_kfree_skb(frame->skb); |
| 1190 | kfree(frame); |
| 1191 | } |
| 1192 | spin_unlock(&flist_lock); |
| 1193 | |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1194 | mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx); |
Dan Carpenter | aec9db3 | 2011-08-30 03:46:40 +0000 | [diff] [blame] | 1195 | list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) { |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1196 | if (entry->ldev == dev) { |
| 1197 | list_del(&entry->list); |
| 1198 | kfree(entry); |
| 1199 | } |
Dan Carpenter | aec9db3 | 2011-08-30 03:46:40 +0000 | [diff] [blame] | 1200 | } |
Alexander Smirnov | 44331fe | 2011-08-24 19:34:42 -0700 | [diff] [blame] | 1201 | mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx); |
| 1202 | |
| 1203 | mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx); |
| 1204 | |
| 1205 | unregister_netdevice_queue(dev, head); |
| 1206 | |
| 1207 | dev_put(real_dev); |
| 1208 | } |
| 1209 | |
| 1210 | static struct rtnl_link_ops lowpan_link_ops __read_mostly = { |
| 1211 | .kind = "lowpan", |
| 1212 | .priv_size = sizeof(struct lowpan_dev_info), |
| 1213 | .setup = lowpan_setup, |
| 1214 | .newlink = lowpan_newlink, |
| 1215 | .dellink = lowpan_dellink, |
| 1216 | .validate = lowpan_validate, |
| 1217 | }; |
| 1218 | |
| 1219 | static inline int __init lowpan_netlink_init(void) |
| 1220 | { |
| 1221 | return rtnl_link_register(&lowpan_link_ops); |
| 1222 | } |
| 1223 | |
| 1224 | static inline void __init lowpan_netlink_fini(void) |
| 1225 | { |
| 1226 | rtnl_link_unregister(&lowpan_link_ops); |
| 1227 | } |
| 1228 | |
| 1229 | static struct packet_type lowpan_packet_type = { |
| 1230 | .type = __constant_htons(ETH_P_IEEE802154), |
| 1231 | .func = lowpan_rcv, |
| 1232 | }; |
| 1233 | |
| 1234 | static int __init lowpan_init_module(void) |
| 1235 | { |
| 1236 | int err = 0; |
| 1237 | |
| 1238 | pr_debug("(%s)\n", __func__); |
| 1239 | |
| 1240 | err = lowpan_netlink_init(); |
| 1241 | if (err < 0) |
| 1242 | goto out; |
| 1243 | |
| 1244 | dev_add_pack(&lowpan_packet_type); |
| 1245 | out: |
| 1246 | return err; |
| 1247 | } |
| 1248 | |
| 1249 | static void __exit lowpan_cleanup_module(void) |
| 1250 | { |
| 1251 | pr_debug("(%s)\n", __func__); |
| 1252 | |
| 1253 | lowpan_netlink_fini(); |
| 1254 | |
| 1255 | dev_remove_pack(&lowpan_packet_type); |
| 1256 | } |
| 1257 | |
| 1258 | module_init(lowpan_init_module); |
| 1259 | module_exit(lowpan_cleanup_module); |
| 1260 | MODULE_LICENSE("GPL"); |
| 1261 | MODULE_ALIAS_RTNL_LINK("lowpan"); |