435 lines
12 KiB
C
435 lines
12 KiB
C
/*
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* Copyright 2011, Siemens AG
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* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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/*
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* Based on patches from Jon Smirl <jonsmirl@gmail.com>
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* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* Jon's code is based on 6lowpan implementation for Contiki which is:
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __6LOWPAN_H__
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#define __6LOWPAN_H__
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#include <net/ipv6.h>
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#define UIP_802154_SHORTADDR_LEN 2 /* compressed ipv6 address length */
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#define UIP_IPH_LEN 40 /* ipv6 fixed header size */
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#define UIP_PROTO_UDP 17 /* ipv6 next header value for UDP */
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#define UIP_FRAGH_LEN 8 /* ipv6 fragment header size */
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/*
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* ipv6 address based on mac
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* second bit-flip (Universe/Local) is done according RFC2464
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*/
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#define is_addr_mac_addr_based(a, m) \
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((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \
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(((a)->s6_addr[9]) == (m)[1]) && \
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(((a)->s6_addr[10]) == (m)[2]) && \
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(((a)->s6_addr[11]) == (m)[3]) && \
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(((a)->s6_addr[12]) == (m)[4]) && \
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(((a)->s6_addr[13]) == (m)[5]) && \
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(((a)->s6_addr[14]) == (m)[6]) && \
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(((a)->s6_addr[15]) == (m)[7]))
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/* ipv6 address is unspecified */
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#define is_addr_unspecified(a) \
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((((a)->s6_addr32[0]) == 0) && \
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(((a)->s6_addr32[1]) == 0) && \
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(((a)->s6_addr32[2]) == 0) && \
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(((a)->s6_addr32[3]) == 0))
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/* compare ipv6 addresses prefixes */
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#define ipaddr_prefixcmp(addr1, addr2, length) \
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(memcmp(addr1, addr2, length >> 3) == 0)
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/* local link, i.e. FE80::/10 */
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#define is_addr_link_local(a) (((a)->s6_addr16[0]) == htons(0xFE80))
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/*
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* check whether we can compress the IID to 16 bits,
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* it's possible for unicast adresses with first 49 bits are zero only.
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*/
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#define lowpan_is_iid_16_bit_compressable(a) \
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((((a)->s6_addr16[4]) == 0) && \
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(((a)->s6_addr[10]) == 0) && \
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(((a)->s6_addr[11]) == 0xff) && \
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(((a)->s6_addr[12]) == 0xfe) && \
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(((a)->s6_addr[13]) == 0))
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/* multicast address */
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#define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF)
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/* check whether the 112-bit gid of the multicast address is mappable to: */
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/* 9 bits, for FF02::1 (all nodes) and FF02::2 (all routers) addresses only. */
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#define lowpan_is_mcast_addr_compressable(a) \
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((((a)->s6_addr16[1]) == 0) && \
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(((a)->s6_addr16[2]) == 0) && \
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(((a)->s6_addr16[3]) == 0) && \
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(((a)->s6_addr16[4]) == 0) && \
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(((a)->s6_addr16[5]) == 0) && \
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(((a)->s6_addr16[6]) == 0) && \
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(((a)->s6_addr[14]) == 0) && \
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((((a)->s6_addr[15]) == 1) || (((a)->s6_addr[15]) == 2)))
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/* 48 bits, FFXX::00XX:XXXX:XXXX */
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#define lowpan_is_mcast_addr_compressable48(a) \
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((((a)->s6_addr16[1]) == 0) && \
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(((a)->s6_addr16[2]) == 0) && \
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(((a)->s6_addr16[3]) == 0) && \
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(((a)->s6_addr16[4]) == 0) && \
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(((a)->s6_addr[10]) == 0))
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/* 32 bits, FFXX::00XX:XXXX */
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#define lowpan_is_mcast_addr_compressable32(a) \
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((((a)->s6_addr16[1]) == 0) && \
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(((a)->s6_addr16[2]) == 0) && \
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(((a)->s6_addr16[3]) == 0) && \
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(((a)->s6_addr16[4]) == 0) && \
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(((a)->s6_addr16[5]) == 0) && \
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(((a)->s6_addr[12]) == 0))
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/* 8 bits, FF02::00XX */
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#define lowpan_is_mcast_addr_compressable8(a) \
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((((a)->s6_addr[1]) == 2) && \
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(((a)->s6_addr16[1]) == 0) && \
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(((a)->s6_addr16[2]) == 0) && \
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(((a)->s6_addr16[3]) == 0) && \
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(((a)->s6_addr16[4]) == 0) && \
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(((a)->s6_addr16[5]) == 0) && \
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(((a)->s6_addr16[6]) == 0) && \
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(((a)->s6_addr[14]) == 0))
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#define lowpan_is_addr_broadcast(a) \
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((((a)[0]) == 0xFF) && \
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(((a)[1]) == 0xFF) && \
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(((a)[2]) == 0xFF) && \
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(((a)[3]) == 0xFF) && \
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(((a)[4]) == 0xFF) && \
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(((a)[5]) == 0xFF) && \
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(((a)[6]) == 0xFF) && \
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(((a)[7]) == 0xFF))
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#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
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#define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
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#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
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#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
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#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
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#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */
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#define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
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#define LOWPAN_FRAG1_HEAD_SIZE 0x4
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#define LOWPAN_FRAGN_HEAD_SIZE 0x5
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/*
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* According IEEE802.15.4 standard:
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* - MTU is 127 octets
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* - maximum MHR size is 37 octets
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* - MFR size is 2 octets
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*
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* so minimal payload size that we may guarantee is:
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* MTU - MHR - MFR = 88 octets
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*/
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#define LOWPAN_FRAG_SIZE 88
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/*
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* Values of fields within the IPHC encoding first byte
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* (C stands for compressed and I for inline)
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*/
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#define LOWPAN_IPHC_TF 0x18
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#define LOWPAN_IPHC_FL_C 0x10
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#define LOWPAN_IPHC_TC_C 0x08
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#define LOWPAN_IPHC_NH_C 0x04
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#define LOWPAN_IPHC_TTL_1 0x01
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#define LOWPAN_IPHC_TTL_64 0x02
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#define LOWPAN_IPHC_TTL_255 0x03
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#define LOWPAN_IPHC_TTL_I 0x00
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/* Values of fields within the IPHC encoding second byte */
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#define LOWPAN_IPHC_CID 0x80
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#define LOWPAN_IPHC_ADDR_00 0x00
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#define LOWPAN_IPHC_ADDR_01 0x01
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#define LOWPAN_IPHC_ADDR_02 0x02
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#define LOWPAN_IPHC_ADDR_03 0x03
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#define LOWPAN_IPHC_SAC 0x40
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#define LOWPAN_IPHC_SAM 0x30
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#define LOWPAN_IPHC_SAM_BIT 4
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#define LOWPAN_IPHC_M 0x08
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#define LOWPAN_IPHC_DAC 0x04
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#define LOWPAN_IPHC_DAM_00 0x00
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#define LOWPAN_IPHC_DAM_01 0x01
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#define LOWPAN_IPHC_DAM_10 0x02
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#define LOWPAN_IPHC_DAM_11 0x03
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#define LOWPAN_IPHC_DAM_BIT 0
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/*
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* LOWPAN_UDP encoding (works together with IPHC)
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*/
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#define LOWPAN_NHC_UDP_MASK 0xF8
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#define LOWPAN_NHC_UDP_ID 0xF0
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#define LOWPAN_NHC_UDP_CHECKSUMC 0x04
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#define LOWPAN_NHC_UDP_CHECKSUMI 0x00
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#define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0
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#define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0
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#define LOWPAN_NHC_UDP_8BIT_PORT 0xF000
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#define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00
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/* values for port compression, _with checksum_ ie bit 5 set to 0 */
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#define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */
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#define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline,
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dest = 0xF0 + 8 bit inline */
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#define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline,
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dest = 16 bit inline */
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#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
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#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */
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#ifdef DEBUG
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/* print data in line */
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static inline void raw_dump_inline(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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if (msg)
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pr_debug("%s():%s: ", caller, msg);
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print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
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}
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/* print data in a table format:
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*
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* addr: xx xx xx xx xx xx
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* addr: xx xx xx xx xx xx
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* ...
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*/
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static inline void raw_dump_table(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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if (msg)
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pr_debug("%s():%s:\n", caller, msg);
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print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
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}
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#else
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static inline void raw_dump_table(const char *caller, char *msg,
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unsigned char *buf, int len) { }
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static inline void raw_dump_inline(const char *caller, char *msg,
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unsigned char *buf, int len) { }
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#endif
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static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 1)))
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return -EINVAL;
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*val = skb->data[0];
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skb_pull(skb, 1);
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return 0;
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}
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static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 2)))
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return -EINVAL;
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*val = (skb->data[0] << 8) | skb->data[1];
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skb_pull(skb, 2);
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return 0;
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}
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static inline bool lowpan_fetch_skb(struct sk_buff *skb,
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void *data, const unsigned int len)
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{
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if (unlikely(!pskb_may_pull(skb, len)))
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return true;
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skb_copy_from_linear_data(skb, data, len);
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skb_pull(skb, len);
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return false;
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}
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static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
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const size_t len)
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{
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memcpy(*hc_ptr, data, len);
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*hc_ptr += len;
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}
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static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
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{
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static const u8 addr_sizes[] = {
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[LOWPAN_IPHC_ADDR_00] = 16,
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[LOWPAN_IPHC_ADDR_01] = 8,
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[LOWPAN_IPHC_ADDR_02] = 2,
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[LOWPAN_IPHC_ADDR_03] = 0,
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};
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return addr_sizes[addr_mode];
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}
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static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
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{
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u8 ret = 1;
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if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
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*uncomp_header += sizeof(struct udphdr);
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switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
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case LOWPAN_NHC_UDP_CS_P_00:
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ret += 4;
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break;
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case LOWPAN_NHC_UDP_CS_P_01:
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case LOWPAN_NHC_UDP_CS_P_10:
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ret += 3;
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break;
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case LOWPAN_NHC_UDP_CS_P_11:
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ret++;
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break;
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default:
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break;
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}
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if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
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ret += 2;
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}
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return ret;
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}
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/**
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* lowpan_uncompress_size - returns skb->len size with uncompressed header
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* @skb: sk_buff with 6lowpan header inside
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* @datagram_offset: optional to get the datagram_offset value
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*
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* Returns the skb->len with uncompressed header
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*/
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static inline u16
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lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
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{
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u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
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u8 iphc0, iphc1, h_enc;
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iphc0 = skb_network_header(skb)[0];
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iphc1 = skb_network_header(skb)[1];
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switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
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case 0:
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ret += 4;
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break;
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case 1:
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ret += 3;
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break;
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case 2:
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ret++;
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break;
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default:
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break;
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}
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if (!(iphc0 & LOWPAN_IPHC_NH_C))
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ret++;
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if (!(iphc0 & 0x03))
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ret++;
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ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
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LOWPAN_IPHC_SAM_BIT);
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if (iphc1 & LOWPAN_IPHC_M) {
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switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
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LOWPAN_IPHC_DAM_BIT) {
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case LOWPAN_IPHC_DAM_00:
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ret += 16;
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break;
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case LOWPAN_IPHC_DAM_01:
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ret += 6;
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break;
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case LOWPAN_IPHC_DAM_10:
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ret += 4;
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break;
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case LOWPAN_IPHC_DAM_11:
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ret++;
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break;
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default:
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break;
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}
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} else {
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ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
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LOWPAN_IPHC_DAM_BIT);
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}
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if (iphc0 & LOWPAN_IPHC_NH_C) {
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h_enc = skb_network_header(skb)[ret];
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ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
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}
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if (dgram_offset)
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*dgram_offset = uncomp_header;
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return skb->len + uncomp_header - ret;
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}
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typedef int (*skb_delivery_cb)(struct sk_buff *skb, struct net_device *dev);
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int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
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const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
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const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
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u8 iphc0, u8 iphc1, skb_delivery_cb skb_deliver);
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int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len);
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#endif /* __6LOWPAN_H__ */
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