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 644d6a6aedSAlexander Aring #define EUI64_ADDR_LEN 8 654d6a6aedSAlexander Aring 6687a93e4eSAlexander Aring #define LOWPAN_NHC_MAX_ID_LEN 1 67bf513fd6SAlexander Aring /* Maximum next header compression length which we currently support inclusive 68bf513fd6SAlexander Aring * possible inline data. 69bf513fd6SAlexander Aring */ 70bf513fd6SAlexander Aring #define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr)) 7187a93e4eSAlexander Aring /* Max IPHC Header len without IPv6 hdr specific inline data. 7287a93e4eSAlexander Aring * Useful for getting the "extra" bytes we need at worst case compression. 7387a93e4eSAlexander Aring * 7487a93e4eSAlexander Aring * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN 7587a93e4eSAlexander Aring */ 7687a93e4eSAlexander Aring #define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN) 77bf513fd6SAlexander Aring /* Maximum worst case IPHC header buffer size */ 78bf513fd6SAlexander Aring #define LOWPAN_IPHC_MAX_HC_BUF_LEN (sizeof(struct ipv6hdr) + \ 79bf513fd6SAlexander Aring LOWPAN_IPHC_MAX_HEADER_LEN + \ 80bf513fd6SAlexander Aring LOWPAN_NHC_MAX_HDR_LEN) 8187a93e4eSAlexander Aring 82cefc8c8aSAlexander Aring /* 83cefc8c8aSAlexander Aring * ipv6 address based on mac 84cefc8c8aSAlexander Aring * second bit-flip (Universe/Local) is done according RFC2464 85cefc8c8aSAlexander Aring */ 86cefc8c8aSAlexander Aring #define is_addr_mac_addr_based(a, m) \ 87cefc8c8aSAlexander Aring ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \ 88cefc8c8aSAlexander Aring (((a)->s6_addr[9]) == (m)[1]) && \ 89cefc8c8aSAlexander Aring (((a)->s6_addr[10]) == (m)[2]) && \ 90cefc8c8aSAlexander Aring (((a)->s6_addr[11]) == (m)[3]) && \ 91cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == (m)[4]) && \ 92cefc8c8aSAlexander Aring (((a)->s6_addr[13]) == (m)[5]) && \ 93cefc8c8aSAlexander Aring (((a)->s6_addr[14]) == (m)[6]) && \ 94cefc8c8aSAlexander Aring (((a)->s6_addr[15]) == (m)[7])) 95cefc8c8aSAlexander Aring 96cefc8c8aSAlexander Aring /* 97cefc8c8aSAlexander Aring * check whether we can compress the IID to 16 bits, 98cefc8c8aSAlexander Aring * it's possible for unicast adresses with first 49 bits are zero only. 99cefc8c8aSAlexander Aring */ 100cefc8c8aSAlexander Aring #define lowpan_is_iid_16_bit_compressable(a) \ 101cefc8c8aSAlexander Aring ((((a)->s6_addr16[4]) == 0) && \ 102cefc8c8aSAlexander Aring (((a)->s6_addr[10]) == 0) && \ 103cefc8c8aSAlexander Aring (((a)->s6_addr[11]) == 0xff) && \ 104cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == 0xfe) && \ 105cefc8c8aSAlexander Aring (((a)->s6_addr[13]) == 0)) 106cefc8c8aSAlexander Aring 107cefc8c8aSAlexander Aring /* check whether the 112-bit gid of the multicast address is mappable to: */ 108cefc8c8aSAlexander Aring 109cefc8c8aSAlexander Aring /* 48 bits, FFXX::00XX:XXXX:XXXX */ 110cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable48(a) \ 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_addr[10]) == 0)) 116cefc8c8aSAlexander Aring 117cefc8c8aSAlexander Aring /* 32 bits, FFXX::00XX:XXXX */ 118cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable32(a) \ 119cefc8c8aSAlexander Aring ((((a)->s6_addr16[1]) == 0) && \ 120cefc8c8aSAlexander Aring (((a)->s6_addr16[2]) == 0) && \ 121cefc8c8aSAlexander Aring (((a)->s6_addr16[3]) == 0) && \ 122cefc8c8aSAlexander Aring (((a)->s6_addr16[4]) == 0) && \ 123cefc8c8aSAlexander Aring (((a)->s6_addr16[5]) == 0) && \ 124cefc8c8aSAlexander Aring (((a)->s6_addr[12]) == 0)) 125cefc8c8aSAlexander Aring 126cefc8c8aSAlexander Aring /* 8 bits, FF02::00XX */ 127cefc8c8aSAlexander Aring #define lowpan_is_mcast_addr_compressable8(a) \ 128cefc8c8aSAlexander Aring ((((a)->s6_addr[1]) == 2) && \ 129cefc8c8aSAlexander Aring (((a)->s6_addr16[1]) == 0) && \ 130cefc8c8aSAlexander Aring (((a)->s6_addr16[2]) == 0) && \ 131cefc8c8aSAlexander Aring (((a)->s6_addr16[3]) == 0) && \ 132cefc8c8aSAlexander Aring (((a)->s6_addr16[4]) == 0) && \ 133cefc8c8aSAlexander Aring (((a)->s6_addr16[5]) == 0) && \ 134cefc8c8aSAlexander Aring (((a)->s6_addr16[6]) == 0) && \ 135cefc8c8aSAlexander Aring (((a)->s6_addr[14]) == 0)) 136cefc8c8aSAlexander Aring 137cefc8c8aSAlexander Aring #define lowpan_is_addr_broadcast(a) \ 138cefc8c8aSAlexander Aring ((((a)[0]) == 0xFF) && \ 139cefc8c8aSAlexander Aring (((a)[1]) == 0xFF) && \ 140cefc8c8aSAlexander Aring (((a)[2]) == 0xFF) && \ 141cefc8c8aSAlexander Aring (((a)[3]) == 0xFF) && \ 142cefc8c8aSAlexander Aring (((a)[4]) == 0xFF) && \ 143cefc8c8aSAlexander Aring (((a)[5]) == 0xFF) && \ 144cefc8c8aSAlexander Aring (((a)[6]) == 0xFF) && \ 145cefc8c8aSAlexander Aring (((a)[7]) == 0xFF)) 146cefc8c8aSAlexander Aring 147cefc8c8aSAlexander Aring #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ 148cefc8c8aSAlexander Aring #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ 14972a5e6bbSAlexander Aring #define LOWPAN_DISPATCH_IPHC_MASK 0xe0 150cefc8c8aSAlexander Aring 15172a5e6bbSAlexander Aring static inline bool lowpan_is_ipv6(u8 dispatch) 15272a5e6bbSAlexander Aring { 15372a5e6bbSAlexander Aring return dispatch == LOWPAN_DISPATCH_IPV6; 15472a5e6bbSAlexander Aring } 15572a5e6bbSAlexander Aring 15672a5e6bbSAlexander Aring static inline bool lowpan_is_iphc(u8 dispatch) 15772a5e6bbSAlexander Aring { 15872a5e6bbSAlexander Aring return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC; 15972a5e6bbSAlexander Aring } 160cefc8c8aSAlexander Aring 161cefc8c8aSAlexander Aring #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */ 162cefc8c8aSAlexander Aring 163cefc8c8aSAlexander Aring #define LOWPAN_FRAG1_HEAD_SIZE 0x4 164cefc8c8aSAlexander Aring #define LOWPAN_FRAGN_HEAD_SIZE 0x5 165cefc8c8aSAlexander Aring 166cefc8c8aSAlexander Aring /* 167cefc8c8aSAlexander Aring * Values of fields within the IPHC encoding first byte 168cefc8c8aSAlexander Aring * (C stands for compressed and I for inline) 169cefc8c8aSAlexander Aring */ 170cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TF 0x18 171cefc8c8aSAlexander Aring 172cefc8c8aSAlexander Aring #define LOWPAN_IPHC_FL_C 0x10 173cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TC_C 0x08 174cefc8c8aSAlexander Aring #define LOWPAN_IPHC_NH_C 0x04 175cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_1 0x01 176cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_64 0x02 177cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_255 0x03 178cefc8c8aSAlexander Aring #define LOWPAN_IPHC_TTL_I 0x00 179cefc8c8aSAlexander Aring 180cefc8c8aSAlexander Aring 181cefc8c8aSAlexander Aring /* Values of fields within the IPHC encoding second byte */ 182cefc8c8aSAlexander Aring #define LOWPAN_IPHC_CID 0x80 183cefc8c8aSAlexander Aring 184cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_00 0x00 185cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_01 0x01 186cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_02 0x02 187cefc8c8aSAlexander Aring #define LOWPAN_IPHC_ADDR_03 0x03 188cefc8c8aSAlexander Aring 189cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAC 0x40 190cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAM 0x30 191cefc8c8aSAlexander Aring 192cefc8c8aSAlexander Aring #define LOWPAN_IPHC_SAM_BIT 4 193cefc8c8aSAlexander Aring 194cefc8c8aSAlexander Aring #define LOWPAN_IPHC_M 0x08 195cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAC 0x04 196cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_00 0x00 197cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_01 0x01 198cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_10 0x02 199cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_11 0x03 200cefc8c8aSAlexander Aring 201cefc8c8aSAlexander Aring #define LOWPAN_IPHC_DAM_BIT 0 202cefc8c8aSAlexander Aring /* 203cefc8c8aSAlexander Aring * LOWPAN_UDP encoding (works together with IPHC) 204cefc8c8aSAlexander Aring */ 205cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_MASK 0xF8 206cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_ID 0xF0 207cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CHECKSUMC 0x04 208cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CHECKSUMI 0x00 209cefc8c8aSAlexander Aring 210cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0 211cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0 212cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_8BIT_PORT 0xF000 213cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00 214cefc8c8aSAlexander Aring 215cefc8c8aSAlexander Aring /* values for port compression, _with checksum_ ie bit 5 set to 0 */ 216cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */ 217cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline, 218cefc8c8aSAlexander Aring dest = 0xF0 + 8 bit inline */ 219cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, 220cefc8c8aSAlexander Aring dest = 16 bit inline */ 221cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ 222cefc8c8aSAlexander Aring #define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */ 223cefc8c8aSAlexander Aring 224b72f6f51SAlexander Aring #define LOWPAN_PRIV_SIZE(llpriv_size) \ 225b72f6f51SAlexander Aring (sizeof(struct lowpan_priv) + llpriv_size) 226b72f6f51SAlexander Aring 227b72f6f51SAlexander Aring enum lowpan_lltypes { 228b72f6f51SAlexander Aring LOWPAN_LLTYPE_BTLE, 229b72f6f51SAlexander Aring LOWPAN_LLTYPE_IEEE802154, 230b72f6f51SAlexander Aring }; 231b72f6f51SAlexander Aring 232b72f6f51SAlexander Aring struct lowpan_priv { 233b72f6f51SAlexander Aring enum lowpan_lltypes lltype; 234b72f6f51SAlexander Aring 235b72f6f51SAlexander Aring /* must be last */ 236b72f6f51SAlexander Aring u8 priv[0] __aligned(sizeof(void *)); 237b72f6f51SAlexander Aring }; 238b72f6f51SAlexander Aring 239b72f6f51SAlexander Aring static inline 240b72f6f51SAlexander Aring struct lowpan_priv *lowpan_priv(const struct net_device *dev) 241b72f6f51SAlexander Aring { 242b72f6f51SAlexander Aring return netdev_priv(dev); 243b72f6f51SAlexander Aring } 244b72f6f51SAlexander Aring 24572a5e6bbSAlexander Aring struct lowpan_802154_cb { 24672a5e6bbSAlexander Aring u16 d_tag; 24772a5e6bbSAlexander Aring unsigned int d_size; 24872a5e6bbSAlexander Aring u8 d_offset; 24972a5e6bbSAlexander Aring }; 25072a5e6bbSAlexander Aring 25172a5e6bbSAlexander Aring static inline 25272a5e6bbSAlexander Aring struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb) 25372a5e6bbSAlexander Aring { 25472a5e6bbSAlexander Aring BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb)); 25572a5e6bbSAlexander Aring return (struct lowpan_802154_cb *)skb->cb; 25672a5e6bbSAlexander Aring } 25772a5e6bbSAlexander Aring 258cefc8c8aSAlexander Aring #ifdef DEBUG 259cefc8c8aSAlexander Aring /* print data in line */ 260cefc8c8aSAlexander Aring static inline void raw_dump_inline(const char *caller, char *msg, 261a6f77389SAlexander Aring const unsigned char *buf, int len) 262cefc8c8aSAlexander Aring { 263cefc8c8aSAlexander Aring if (msg) 264cefc8c8aSAlexander Aring pr_debug("%s():%s: ", caller, msg); 265cefc8c8aSAlexander Aring 266cefc8c8aSAlexander Aring print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false); 267cefc8c8aSAlexander Aring } 268cefc8c8aSAlexander Aring 269cefc8c8aSAlexander Aring /* print data in a table format: 270cefc8c8aSAlexander Aring * 271cefc8c8aSAlexander Aring * addr: xx xx xx xx xx xx 272cefc8c8aSAlexander Aring * addr: xx xx xx xx xx xx 273cefc8c8aSAlexander Aring * ... 274cefc8c8aSAlexander Aring */ 275cefc8c8aSAlexander Aring static inline void raw_dump_table(const char *caller, char *msg, 276a6f77389SAlexander Aring const unsigned char *buf, int len) 277cefc8c8aSAlexander Aring { 278cefc8c8aSAlexander Aring if (msg) 279cefc8c8aSAlexander Aring pr_debug("%s():%s:\n", caller, msg); 280cefc8c8aSAlexander Aring 281cefc8c8aSAlexander Aring print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false); 282cefc8c8aSAlexander Aring } 283cefc8c8aSAlexander Aring #else 284cefc8c8aSAlexander Aring static inline void raw_dump_table(const char *caller, char *msg, 285a6f77389SAlexander Aring const unsigned char *buf, int len) { } 286cefc8c8aSAlexander Aring static inline void raw_dump_inline(const char *caller, char *msg, 287a6f77389SAlexander Aring const unsigned char *buf, int len) { } 288cefc8c8aSAlexander Aring #endif 289cefc8c8aSAlexander Aring 290*478208e3SAlexander Aring /** 291*478208e3SAlexander Aring * lowpan_fetch_skb - getting inline data from 6LoWPAN header 292*478208e3SAlexander Aring * 293*478208e3SAlexander Aring * This function will pull data from sk buffer and put it into data to 294*478208e3SAlexander Aring * remove the 6LoWPAN inline data. This function returns true if the 295*478208e3SAlexander Aring * sk buffer is too small to pull the amount of data which is specified 296*478208e3SAlexander Aring * by len. 297*478208e3SAlexander Aring * 298*478208e3SAlexander Aring * @skb: the buffer where the inline data should be pulled from. 299*478208e3SAlexander Aring * @data: destination buffer for the inline data. 300*478208e3SAlexander Aring * @len: amount of data which should be pulled in bytes. 301*478208e3SAlexander Aring */ 302*478208e3SAlexander Aring static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data, 303*478208e3SAlexander Aring unsigned int len) 304cefc8c8aSAlexander Aring { 305cefc8c8aSAlexander Aring if (unlikely(!pskb_may_pull(skb, len))) 306cefc8c8aSAlexander Aring return true; 307cefc8c8aSAlexander Aring 308cefc8c8aSAlexander Aring skb_copy_from_linear_data(skb, data, len); 309cefc8c8aSAlexander Aring skb_pull(skb, len); 310cefc8c8aSAlexander Aring 311cefc8c8aSAlexander Aring return false; 312cefc8c8aSAlexander Aring } 313cefc8c8aSAlexander Aring 314cefc8c8aSAlexander Aring static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, 315cefc8c8aSAlexander Aring const size_t len) 316cefc8c8aSAlexander Aring { 317cefc8c8aSAlexander Aring memcpy(*hc_ptr, data, len); 318cefc8c8aSAlexander Aring *hc_ptr += len; 319cefc8c8aSAlexander Aring } 320cefc8c8aSAlexander Aring 321b72f6f51SAlexander Aring void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); 322b72f6f51SAlexander Aring 3238911d774SAlexander Aring /** 3248911d774SAlexander Aring * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header 3258911d774SAlexander Aring * 3268911d774SAlexander Aring * This function replaces the IPHC 6LoWPAN header which should be pointed at 3278911d774SAlexander Aring * skb->data and skb_network_header, with the IPv6 header. 3288911d774SAlexander Aring * It would be nice that the caller have the necessary headroom of IPv6 header 3298911d774SAlexander Aring * and greatest Transport layer header, this would reduce the overhead for 3308911d774SAlexander Aring * reallocate headroom. 3318911d774SAlexander Aring * 3328911d774SAlexander Aring * @skb: the buffer which should be manipulate. 3338911d774SAlexander Aring * @dev: the lowpan net device pointer. 3348911d774SAlexander Aring * @daddr: destination lladdr of mac header which is used for compression 3358911d774SAlexander Aring * methods. 3368911d774SAlexander Aring * @saddr: source lladdr of mac header which is used for compression 3378911d774SAlexander Aring * methods. 3388911d774SAlexander Aring */ 3398911d774SAlexander Aring int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, 3408911d774SAlexander Aring const void *daddr, const void *saddr); 341a6f77389SAlexander Aring 342a6f77389SAlexander Aring /** 343a6f77389SAlexander Aring * lowpan_header_compress - replace IPv6 header with 6LoWPAN header 344a6f77389SAlexander Aring * 345a6f77389SAlexander Aring * This function replaces the IPv6 header which should be pointed at 346a6f77389SAlexander Aring * skb->data and skb_network_header, with the IPHC 6LoWPAN header. 347a6f77389SAlexander Aring * The caller need to be sure that the sk buffer is not shared and at have 348a6f77389SAlexander Aring * at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN, 349a6f77389SAlexander Aring * which is the IPHC "more bytes than IPv6 header" at worst case. 350a6f77389SAlexander Aring * 351a6f77389SAlexander Aring * @skb: the buffer which should be manipulate. 352a6f77389SAlexander Aring * @dev: the lowpan net device pointer. 353a6f77389SAlexander Aring * @daddr: destination lladdr of mac header which is used for compression 354a6f77389SAlexander Aring * methods. 355a6f77389SAlexander Aring * @saddr: source lladdr of mac header which is used for compression 356a6f77389SAlexander Aring * methods. 357a6f77389SAlexander Aring */ 358a6f77389SAlexander Aring int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, 359a6f77389SAlexander Aring const void *daddr, const void *saddr); 360cefc8c8aSAlexander Aring 361cefc8c8aSAlexander Aring #endif /* __6LOWPAN_H__ */ 362