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