1cefc8c8aSAlexander Aring /* 2cefc8c8aSAlexander Aring * Copyright 2011, Siemens AG 3cefc8c8aSAlexander Aring * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 4cefc8c8aSAlexander Aring */ 5cefc8c8aSAlexander Aring 6cefc8c8aSAlexander Aring /* 7cefc8c8aSAlexander Aring * Based on patches from Jon Smirl <jonsmirl@gmail.com> 8cefc8c8aSAlexander Aring * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> 9cefc8c8aSAlexander Aring * 10cefc8c8aSAlexander Aring * This program is free software; you can redistribute it and/or modify 11cefc8c8aSAlexander Aring * it under the terms of the GNU General Public License version 2 12cefc8c8aSAlexander Aring * as published by the Free Software Foundation. 13cefc8c8aSAlexander Aring * 14cefc8c8aSAlexander Aring * This program is distributed in the hope that it will be useful, 15cefc8c8aSAlexander Aring * but WITHOUT ANY WARRANTY; without even the implied warranty of 16cefc8c8aSAlexander Aring * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17cefc8c8aSAlexander Aring * GNU General Public License for more details. 18cefc8c8aSAlexander Aring * 19cefc8c8aSAlexander Aring * You should have received a copy of the GNU General Public License along 20cefc8c8aSAlexander Aring * with this program; if not, write to the Free Software Foundation, Inc., 21cefc8c8aSAlexander Aring * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 22cefc8c8aSAlexander Aring */ 23cefc8c8aSAlexander Aring 24cefc8c8aSAlexander Aring /* Jon's code is based on 6lowpan implementation for Contiki which is: 25cefc8c8aSAlexander Aring * Copyright (c) 2008, Swedish Institute of Computer Science. 26cefc8c8aSAlexander Aring * All rights reserved. 27cefc8c8aSAlexander Aring * 28cefc8c8aSAlexander Aring * Redistribution and use in source and binary forms, with or without 29cefc8c8aSAlexander Aring * modification, are permitted provided that the following conditions 30cefc8c8aSAlexander Aring * are met: 31cefc8c8aSAlexander Aring * 1. Redistributions of source code must retain the above copyright 32cefc8c8aSAlexander Aring * notice, this list of conditions and the following disclaimer. 33cefc8c8aSAlexander Aring * 2. Redistributions in binary form must reproduce the above copyright 34cefc8c8aSAlexander Aring * notice, this list of conditions and the following disclaimer in the 35cefc8c8aSAlexander Aring * documentation and/or other materials provided with the distribution. 36cefc8c8aSAlexander Aring * 3. Neither the name of the Institute nor the names of its contributors 37cefc8c8aSAlexander Aring * may be used to endorse or promote products derived from this software 38cefc8c8aSAlexander Aring * without specific prior written permission. 39cefc8c8aSAlexander Aring * 40cefc8c8aSAlexander Aring * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 41cefc8c8aSAlexander Aring * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42cefc8c8aSAlexander Aring * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43cefc8c8aSAlexander Aring * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 44cefc8c8aSAlexander Aring * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45cefc8c8aSAlexander Aring * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46cefc8c8aSAlexander Aring * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47cefc8c8aSAlexander Aring * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48cefc8c8aSAlexander Aring * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49cefc8c8aSAlexander Aring * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50cefc8c8aSAlexander Aring * SUCH DAMAGE. 51cefc8c8aSAlexander Aring */ 52cefc8c8aSAlexander Aring 53cefc8c8aSAlexander Aring #ifndef __6LOWPAN_H__ 54cefc8c8aSAlexander Aring #define __6LOWPAN_H__ 55cefc8c8aSAlexander Aring 56cefc8c8aSAlexander Aring #include <net/ipv6.h> 5717d8ecb8SLuis R. Rodriguez #include <net/net_namespace.h> 58cefc8c8aSAlexander Aring 59cefc8c8aSAlexander Aring #define UIP_802154_SHORTADDR_LEN 2 /* compressed ipv6 address length */ 60cefc8c8aSAlexander Aring #define UIP_IPH_LEN 40 /* ipv6 fixed header size */ 61cefc8c8aSAlexander Aring #define UIP_PROTO_UDP 17 /* ipv6 next header value for UDP */ 62cefc8c8aSAlexander Aring #define UIP_FRAGH_LEN 8 /* ipv6 fragment header size */ 63cefc8c8aSAlexander Aring 64cefc8c8aSAlexander Aring /* 65cefc8c8aSAlexander Aring * ipv6 address based on mac 66cefc8c8aSAlexander Aring * second bit-flip (Universe/Local) is done according RFC2464 67cefc8c8aSAlexander Aring */ 68cefc8c8aSAlexander Aring #define is_addr_mac_addr_based(a, m) \ 69cefc8c8aSAlexander Aring ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \ 70cefc8c8aSAlexander Aring (((a)->s6_addr[9]) == (m)[1]) && \ 71cefc8c8aSAlexander Aring (((a)->s6_addr[10]) == (m)[2]) && \ 72cefc8c8aSAlexander Aring (((a)->s6_addr[11]) == (m)[3]) && \ 73cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == (m)[4]) && \ 74cefc8c8aSAlexander Aring (((a)->s6_addr[13]) == (m)[5]) && \ 75cefc8c8aSAlexander Aring (((a)->s6_addr[14]) == (m)[6]) && \ 76cefc8c8aSAlexander Aring (((a)->s6_addr[15]) == (m)[7])) 77cefc8c8aSAlexander Aring 78cefc8c8aSAlexander Aring /* 79cefc8c8aSAlexander Aring * check whether we can compress the IID to 16 bits, 80cefc8c8aSAlexander Aring * it's possible for unicast adresses with first 49 bits are zero only. 81cefc8c8aSAlexander Aring */ 82cefc8c8aSAlexander Aring #define lowpan_is_iid_16_bit_compressable(a) \ 83cefc8c8aSAlexander Aring ((((a)->s6_addr16[4]) == 0) && \ 84cefc8c8aSAlexander Aring (((a)->s6_addr[10]) == 0) && \ 85cefc8c8aSAlexander Aring (((a)->s6_addr[11]) == 0xff) && \ 86cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == 0xfe) && \ 87cefc8c8aSAlexander Aring (((a)->s6_addr[13]) == 0)) 88cefc8c8aSAlexander Aring 89cefc8c8aSAlexander Aring /* check whether the 112-bit gid of the multicast address is mappable to: */ 90cefc8c8aSAlexander Aring 91cefc8c8aSAlexander Aring /* 48 bits, FFXX::00XX:XXXX:XXXX */ 92cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable48(a) \ 93cefc8c8aSAlexander Aring ((((a)->s6_addr16[1]) == 0) && \ 94cefc8c8aSAlexander Aring (((a)->s6_addr16[2]) == 0) && \ 95cefc8c8aSAlexander Aring (((a)->s6_addr16[3]) == 0) && \ 96cefc8c8aSAlexander Aring (((a)->s6_addr16[4]) == 0) && \ 97cefc8c8aSAlexander Aring (((a)->s6_addr[10]) == 0)) 98cefc8c8aSAlexander Aring 99cefc8c8aSAlexander Aring /* 32 bits, FFXX::00XX:XXXX */ 100cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable32(a) \ 101cefc8c8aSAlexander Aring ((((a)->s6_addr16[1]) == 0) && \ 102cefc8c8aSAlexander Aring (((a)->s6_addr16[2]) == 0) && \ 103cefc8c8aSAlexander Aring (((a)->s6_addr16[3]) == 0) && \ 104cefc8c8aSAlexander Aring (((a)->s6_addr16[4]) == 0) && \ 105cefc8c8aSAlexander Aring (((a)->s6_addr16[5]) == 0) && \ 106cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == 0)) 107cefc8c8aSAlexander Aring 108cefc8c8aSAlexander Aring /* 8 bits, FF02::00XX */ 109cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable8(a) \ 110cefc8c8aSAlexander Aring ((((a)->s6_addr[1]) == 2) && \ 111cefc8c8aSAlexander Aring (((a)->s6_addr16[1]) == 0) && \ 112cefc8c8aSAlexander Aring (((a)->s6_addr16[2]) == 0) && \ 113cefc8c8aSAlexander Aring (((a)->s6_addr16[3]) == 0) && \ 114cefc8c8aSAlexander Aring (((a)->s6_addr16[4]) == 0) && \ 115cefc8c8aSAlexander Aring (((a)->s6_addr16[5]) == 0) && \ 116cefc8c8aSAlexander Aring (((a)->s6_addr16[6]) == 0) && \ 117cefc8c8aSAlexander Aring (((a)->s6_addr[14]) == 0)) 118cefc8c8aSAlexander Aring 119cefc8c8aSAlexander Aring #define lowpan_is_addr_broadcast(a) \ 120cefc8c8aSAlexander Aring ((((a)[0]) == 0xFF) && \ 121cefc8c8aSAlexander Aring (((a)[1]) == 0xFF) && \ 122cefc8c8aSAlexander Aring (((a)[2]) == 0xFF) && \ 123cefc8c8aSAlexander Aring (((a)[3]) == 0xFF) && \ 124cefc8c8aSAlexander Aring (((a)[4]) == 0xFF) && \ 125cefc8c8aSAlexander Aring (((a)[5]) == 0xFF) && \ 126cefc8c8aSAlexander Aring (((a)[6]) == 0xFF) && \ 127cefc8c8aSAlexander Aring (((a)[7]) == 0xFF)) 128cefc8c8aSAlexander Aring 129cefc8c8aSAlexander Aring #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ 130cefc8c8aSAlexander Aring #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ 13172a5e6bbSAlexander Aring #define LOWPAN_DISPATCH_IPHC_MASK 0xe0 132cefc8c8aSAlexander Aring 13372a5e6bbSAlexander Aring static inline bool lowpan_is_ipv6(u8 dispatch) 13472a5e6bbSAlexander Aring { 13572a5e6bbSAlexander Aring return dispatch == LOWPAN_DISPATCH_IPV6; 13672a5e6bbSAlexander Aring } 13772a5e6bbSAlexander Aring 13872a5e6bbSAlexander Aring static inline bool lowpan_is_iphc(u8 dispatch) 13972a5e6bbSAlexander Aring { 14072a5e6bbSAlexander Aring return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC; 14172a5e6bbSAlexander Aring } 142cefc8c8aSAlexander Aring 143cefc8c8aSAlexander Aring #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */ 144cefc8c8aSAlexander Aring 145cefc8c8aSAlexander Aring #define LOWPAN_FRAG1_HEAD_SIZE 0x4 146cefc8c8aSAlexander Aring #define LOWPAN_FRAGN_HEAD_SIZE 0x5 147cefc8c8aSAlexander Aring 148cefc8c8aSAlexander Aring /* 149cefc8c8aSAlexander Aring * Values of fields within the IPHC encoding first byte 150cefc8c8aSAlexander Aring * (C stands for compressed and I for inline) 151cefc8c8aSAlexander Aring */ 152cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TF 0x18 153cefc8c8aSAlexander Aring 154cefc8c8aSAlexander Aring #define LOWPAN_IPHC_FL_C 0x10 155cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TC_C 0x08 156cefc8c8aSAlexander Aring #define LOWPAN_IPHC_NH_C 0x04 157cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_1 0x01 158cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_64 0x02 159cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_255 0x03 160cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_I 0x00 161cefc8c8aSAlexander Aring 162cefc8c8aSAlexander Aring 163cefc8c8aSAlexander Aring /* Values of fields within the IPHC encoding second byte */ 164cefc8c8aSAlexander Aring #define LOWPAN_IPHC_CID 0x80 165cefc8c8aSAlexander Aring 166cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_00 0x00 167cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_01 0x01 168cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_02 0x02 169cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_03 0x03 170cefc8c8aSAlexander Aring 171cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAC 0x40 172cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAM 0x30 173cefc8c8aSAlexander Aring 174cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAM_BIT 4 175cefc8c8aSAlexander Aring 176cefc8c8aSAlexander Aring #define LOWPAN_IPHC_M 0x08 177cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAC 0x04 178cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_00 0x00 179cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_01 0x01 180cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_10 0x02 181cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_11 0x03 182cefc8c8aSAlexander Aring 183cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_BIT 0 184cefc8c8aSAlexander Aring /* 185cefc8c8aSAlexander Aring * LOWPAN_UDP encoding (works together with IPHC) 186cefc8c8aSAlexander Aring */ 187cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_MASK 0xF8 188cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_ID 0xF0 189cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CHECKSUMC 0x04 190cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CHECKSUMI 0x00 191cefc8c8aSAlexander Aring 192cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0 193cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0 194cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_8BIT_PORT 0xF000 195cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00 196cefc8c8aSAlexander Aring 197cefc8c8aSAlexander Aring /* values for port compression, _with checksum_ ie bit 5 set to 0 */ 198cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */ 199cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline, 200cefc8c8aSAlexander Aring dest = 0xF0 + 8 bit inline */ 201cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, 202cefc8c8aSAlexander Aring dest = 16 bit inline */ 203cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ 204cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */ 205cefc8c8aSAlexander Aring 206b72f6f51SAlexander Aring #define LOWPAN_PRIV_SIZE(llpriv_size) \ 207b72f6f51SAlexander Aring (sizeof(struct lowpan_priv) + llpriv_size) 208b72f6f51SAlexander Aring 209b72f6f51SAlexander Aring enum lowpan_lltypes { 210b72f6f51SAlexander Aring LOWPAN_LLTYPE_BTLE, 211b72f6f51SAlexander Aring LOWPAN_LLTYPE_IEEE802154, 212b72f6f51SAlexander Aring }; 213b72f6f51SAlexander Aring 214b72f6f51SAlexander Aring struct lowpan_priv { 215b72f6f51SAlexander Aring enum lowpan_lltypes lltype; 216b72f6f51SAlexander Aring 217b72f6f51SAlexander Aring /* must be last */ 218b72f6f51SAlexander Aring u8 priv[0] __aligned(sizeof(void *)); 219b72f6f51SAlexander Aring }; 220b72f6f51SAlexander Aring 221b72f6f51SAlexander Aring static inline 222b72f6f51SAlexander Aring struct lowpan_priv *lowpan_priv(const struct net_device *dev) 223b72f6f51SAlexander Aring { 224b72f6f51SAlexander Aring return netdev_priv(dev); 225b72f6f51SAlexander Aring } 226b72f6f51SAlexander Aring 22772a5e6bbSAlexander Aring struct lowpan_802154_cb { 22872a5e6bbSAlexander Aring u16 d_tag; 22972a5e6bbSAlexander Aring unsigned int d_size; 23072a5e6bbSAlexander Aring u8 d_offset; 23172a5e6bbSAlexander Aring }; 23272a5e6bbSAlexander Aring 23372a5e6bbSAlexander Aring static inline 23472a5e6bbSAlexander Aring struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb) 23572a5e6bbSAlexander Aring { 23672a5e6bbSAlexander Aring BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb)); 23772a5e6bbSAlexander Aring return (struct lowpan_802154_cb *)skb->cb; 23872a5e6bbSAlexander Aring } 23972a5e6bbSAlexander Aring 240cefc8c8aSAlexander Aring #ifdef DEBUG 241cefc8c8aSAlexander Aring /* print data in line */ 242cefc8c8aSAlexander Aring static inline void raw_dump_inline(const char *caller, char *msg, 243cefc8c8aSAlexander Aring unsigned char *buf, int len) 244cefc8c8aSAlexander Aring { 245cefc8c8aSAlexander Aring if (msg) 246cefc8c8aSAlexander Aring pr_debug("%s():%s: ", caller, msg); 247cefc8c8aSAlexander Aring 248cefc8c8aSAlexander Aring print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false); 249cefc8c8aSAlexander Aring } 250cefc8c8aSAlexander Aring 251cefc8c8aSAlexander Aring /* print data in a table format: 252cefc8c8aSAlexander Aring * 253cefc8c8aSAlexander Aring * addr: xx xx xx xx xx xx 254cefc8c8aSAlexander Aring * addr: xx xx xx xx xx xx 255cefc8c8aSAlexander Aring * ... 256cefc8c8aSAlexander Aring */ 257cefc8c8aSAlexander Aring static inline void raw_dump_table(const char *caller, char *msg, 258cefc8c8aSAlexander Aring unsigned char *buf, int len) 259cefc8c8aSAlexander Aring { 260cefc8c8aSAlexander Aring if (msg) 261cefc8c8aSAlexander Aring pr_debug("%s():%s:\n", caller, msg); 262cefc8c8aSAlexander Aring 263cefc8c8aSAlexander Aring print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false); 264cefc8c8aSAlexander Aring } 265cefc8c8aSAlexander Aring #else 266cefc8c8aSAlexander Aring static inline void raw_dump_table(const char *caller, char *msg, 267cefc8c8aSAlexander Aring unsigned char *buf, int len) { } 268cefc8c8aSAlexander Aring static inline void raw_dump_inline(const char *caller, char *msg, 269cefc8c8aSAlexander Aring unsigned char *buf, int len) { } 270cefc8c8aSAlexander Aring #endif 271cefc8c8aSAlexander Aring 272cefc8c8aSAlexander Aring static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val) 273cefc8c8aSAlexander Aring { 274cefc8c8aSAlexander Aring if (unlikely(!pskb_may_pull(skb, 1))) 275cefc8c8aSAlexander Aring return -EINVAL; 276cefc8c8aSAlexander Aring 277cefc8c8aSAlexander Aring *val = skb->data[0]; 278cefc8c8aSAlexander Aring skb_pull(skb, 1); 279cefc8c8aSAlexander Aring 280cefc8c8aSAlexander Aring return 0; 281cefc8c8aSAlexander Aring } 282cefc8c8aSAlexander Aring 283cefc8c8aSAlexander Aring static inline bool lowpan_fetch_skb(struct sk_buff *skb, 284cefc8c8aSAlexander Aring void *data, const unsigned int len) 285cefc8c8aSAlexander Aring { 286cefc8c8aSAlexander Aring if (unlikely(!pskb_may_pull(skb, len))) 287cefc8c8aSAlexander Aring return true; 288cefc8c8aSAlexander Aring 289cefc8c8aSAlexander Aring skb_copy_from_linear_data(skb, data, len); 290cefc8c8aSAlexander Aring skb_pull(skb, len); 291cefc8c8aSAlexander Aring 292cefc8c8aSAlexander Aring return false; 293cefc8c8aSAlexander Aring } 294cefc8c8aSAlexander Aring 295cefc8c8aSAlexander Aring static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, 296cefc8c8aSAlexander Aring const size_t len) 297cefc8c8aSAlexander Aring { 298cefc8c8aSAlexander Aring memcpy(*hc_ptr, data, len); 299cefc8c8aSAlexander Aring *hc_ptr += len; 300cefc8c8aSAlexander Aring } 301cefc8c8aSAlexander Aring 302cefc8c8aSAlexander Aring static inline u8 lowpan_addr_mode_size(const u8 addr_mode) 303cefc8c8aSAlexander Aring { 304cefc8c8aSAlexander Aring static const u8 addr_sizes[] = { 305cefc8c8aSAlexander Aring [LOWPAN_IPHC_ADDR_00] = 16, 306cefc8c8aSAlexander Aring [LOWPAN_IPHC_ADDR_01] = 8, 307cefc8c8aSAlexander Aring [LOWPAN_IPHC_ADDR_02] = 2, 308cefc8c8aSAlexander Aring [LOWPAN_IPHC_ADDR_03] = 0, 309cefc8c8aSAlexander Aring }; 310cefc8c8aSAlexander Aring return addr_sizes[addr_mode]; 311cefc8c8aSAlexander Aring } 312cefc8c8aSAlexander Aring 313cefc8c8aSAlexander Aring static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header) 314cefc8c8aSAlexander Aring { 315cefc8c8aSAlexander Aring u8 ret = 1; 316cefc8c8aSAlexander Aring 317cefc8c8aSAlexander Aring if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) { 318cefc8c8aSAlexander Aring *uncomp_header += sizeof(struct udphdr); 319cefc8c8aSAlexander Aring 320cefc8c8aSAlexander Aring switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) { 321cefc8c8aSAlexander Aring case LOWPAN_NHC_UDP_CS_P_00: 322cefc8c8aSAlexander Aring ret += 4; 323cefc8c8aSAlexander Aring break; 324cefc8c8aSAlexander Aring case LOWPAN_NHC_UDP_CS_P_01: 325cefc8c8aSAlexander Aring case LOWPAN_NHC_UDP_CS_P_10: 326cefc8c8aSAlexander Aring ret += 3; 327cefc8c8aSAlexander Aring break; 328cefc8c8aSAlexander Aring case LOWPAN_NHC_UDP_CS_P_11: 329cefc8c8aSAlexander Aring ret++; 330cefc8c8aSAlexander Aring break; 331cefc8c8aSAlexander Aring default: 332cefc8c8aSAlexander Aring break; 333cefc8c8aSAlexander Aring } 334cefc8c8aSAlexander Aring 335cefc8c8aSAlexander Aring if (!(h_enc & LOWPAN_NHC_UDP_CS_C)) 336cefc8c8aSAlexander Aring ret += 2; 337cefc8c8aSAlexander Aring } 338cefc8c8aSAlexander Aring 339cefc8c8aSAlexander Aring return ret; 340cefc8c8aSAlexander Aring } 341cefc8c8aSAlexander Aring 342cefc8c8aSAlexander Aring /** 343cefc8c8aSAlexander Aring * lowpan_uncompress_size - returns skb->len size with uncompressed header 344cefc8c8aSAlexander Aring * @skb: sk_buff with 6lowpan header inside 345cefc8c8aSAlexander Aring * @datagram_offset: optional to get the datagram_offset value 346cefc8c8aSAlexander Aring * 347cefc8c8aSAlexander Aring * Returns the skb->len with uncompressed header 348cefc8c8aSAlexander Aring */ 349cefc8c8aSAlexander Aring static inline u16 350cefc8c8aSAlexander Aring lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset) 351cefc8c8aSAlexander Aring { 352cefc8c8aSAlexander Aring u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr); 353cefc8c8aSAlexander Aring u8 iphc0, iphc1, h_enc; 354cefc8c8aSAlexander Aring 355cefc8c8aSAlexander Aring iphc0 = skb_network_header(skb)[0]; 356cefc8c8aSAlexander Aring iphc1 = skb_network_header(skb)[1]; 357cefc8c8aSAlexander Aring 358cefc8c8aSAlexander Aring switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) { 359cefc8c8aSAlexander Aring case 0: 360cefc8c8aSAlexander Aring ret += 4; 361cefc8c8aSAlexander Aring break; 362cefc8c8aSAlexander Aring case 1: 363cefc8c8aSAlexander Aring ret += 3; 364cefc8c8aSAlexander Aring break; 365cefc8c8aSAlexander Aring case 2: 366cefc8c8aSAlexander Aring ret++; 367cefc8c8aSAlexander Aring break; 368cefc8c8aSAlexander Aring default: 369cefc8c8aSAlexander Aring break; 370cefc8c8aSAlexander Aring } 371cefc8c8aSAlexander Aring 372cefc8c8aSAlexander Aring if (!(iphc0 & LOWPAN_IPHC_NH_C)) 373cefc8c8aSAlexander Aring ret++; 374cefc8c8aSAlexander Aring 375cefc8c8aSAlexander Aring if (!(iphc0 & 0x03)) 376cefc8c8aSAlexander Aring ret++; 377cefc8c8aSAlexander Aring 378cefc8c8aSAlexander Aring ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >> 379cefc8c8aSAlexander Aring LOWPAN_IPHC_SAM_BIT); 380cefc8c8aSAlexander Aring 381cefc8c8aSAlexander Aring if (iphc1 & LOWPAN_IPHC_M) { 382cefc8c8aSAlexander Aring switch ((iphc1 & LOWPAN_IPHC_DAM_11) >> 383cefc8c8aSAlexander Aring LOWPAN_IPHC_DAM_BIT) { 384cefc8c8aSAlexander Aring case LOWPAN_IPHC_DAM_00: 385cefc8c8aSAlexander Aring ret += 16; 386cefc8c8aSAlexander Aring break; 387cefc8c8aSAlexander Aring case LOWPAN_IPHC_DAM_01: 388cefc8c8aSAlexander Aring ret += 6; 389cefc8c8aSAlexander Aring break; 390cefc8c8aSAlexander Aring case LOWPAN_IPHC_DAM_10: 391cefc8c8aSAlexander Aring ret += 4; 392cefc8c8aSAlexander Aring break; 393cefc8c8aSAlexander Aring case LOWPAN_IPHC_DAM_11: 394cefc8c8aSAlexander Aring ret++; 395cefc8c8aSAlexander Aring break; 396cefc8c8aSAlexander Aring default: 397cefc8c8aSAlexander Aring break; 398cefc8c8aSAlexander Aring } 399cefc8c8aSAlexander Aring } else { 400cefc8c8aSAlexander Aring ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >> 401cefc8c8aSAlexander Aring LOWPAN_IPHC_DAM_BIT); 402cefc8c8aSAlexander Aring } 403cefc8c8aSAlexander Aring 404cefc8c8aSAlexander Aring if (iphc0 & LOWPAN_IPHC_NH_C) { 405cefc8c8aSAlexander Aring h_enc = skb_network_header(skb)[ret]; 406cefc8c8aSAlexander Aring ret += lowpan_next_hdr_size(h_enc, &uncomp_header); 407cefc8c8aSAlexander Aring } 408cefc8c8aSAlexander Aring 409cefc8c8aSAlexander Aring if (dgram_offset) 410cefc8c8aSAlexander Aring *dgram_offset = uncomp_header; 411cefc8c8aSAlexander Aring 412cefc8c8aSAlexander Aring return skb->len + uncomp_header - ret; 413cefc8c8aSAlexander Aring } 414cefc8c8aSAlexander Aring 415b72f6f51SAlexander Aring void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); 416b72f6f51SAlexander Aring 41701141234SMartin Townsend int 41801141234SMartin Townsend lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev, 41901141234SMartin Townsend const u8 *saddr, const u8 saddr_type, 42001141234SMartin Townsend const u8 saddr_len, const u8 *daddr, 42101141234SMartin Townsend const u8 daddr_type, const u8 daddr_len, 422f8b36176SMartin Townsend u8 iphc0, u8 iphc1); 423cefc8c8aSAlexander Aring int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, 424cefc8c8aSAlexander Aring unsigned short type, const void *_daddr, 425cefc8c8aSAlexander Aring const void *_saddr, unsigned int len); 426cefc8c8aSAlexander Aring 427cefc8c8aSAlexander Aring #endif /* __6LOWPAN_H__ */ 428