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-rw-r--r--include/net/6lowpan.h434
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diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
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+/*
+ * Copyright 2011, Siemens AG
+ * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
+ */
+
+/*
+ * Based on patches from Jon Smirl <jonsmirl@gmail.com>
+ * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
+ *
+ * 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__
+
+#include <net/ipv6.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 */
+#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */
+
+#ifdef DEBUG
+/* print data in line */
+static inline void raw_dump_inline(const char *caller, char *msg,
+ unsigned char *buf, int len)
+{
+ if (msg)
+ pr_debug("%s():%s: ", caller, msg);
+
+ print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
+}
+
+/* print data in a table format:
+ *
+ * addr: xx xx xx xx xx xx
+ * addr: xx xx xx xx xx xx
+ * ...
+ */
+static inline void raw_dump_table(const char *caller, char *msg,
+ unsigned char *buf, int len)
+{
+ if (msg)
+ pr_debug("%s():%s:\n", caller, msg);
+
+ print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
+}
+#else
+static inline void raw_dump_table(const char *caller, char *msg,
+ unsigned char *buf, int len) { }
+static inline void raw_dump_inline(const char *caller, char *msg,
+ unsigned char *buf, int len) { }
+#endif
+
+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;
+}
+
+static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
+ const size_t len)
+{
+ memcpy(*hc_ptr, data, len);
+ *hc_ptr += len;
+}
+
+static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
+{
+ static const u8 addr_sizes[] = {
+ [LOWPAN_IPHC_ADDR_00] = 16,
+ [LOWPAN_IPHC_ADDR_01] = 8,
+ [LOWPAN_IPHC_ADDR_02] = 2,
+ [LOWPAN_IPHC_ADDR_03] = 0,
+ };
+ return addr_sizes[addr_mode];
+}
+
+static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
+{
+ u8 ret = 1;
+
+ if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
+ *uncomp_header += sizeof(struct udphdr);
+
+ switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
+ case LOWPAN_NHC_UDP_CS_P_00:
+ ret += 4;
+ break;
+ case LOWPAN_NHC_UDP_CS_P_01:
+ case LOWPAN_NHC_UDP_CS_P_10:
+ ret += 3;
+ break;
+ case LOWPAN_NHC_UDP_CS_P_11:
+ ret++;
+ break;
+ default:
+ break;
+ }
+
+ if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
+ ret += 2;
+ }
+
+ return ret;
+}
+
+/**
+ * lowpan_uncompress_size - returns skb->len size with uncompressed header
+ * @skb: sk_buff with 6lowpan header inside
+ * @datagram_offset: optional to get the datagram_offset value
+ *
+ * Returns the skb->len with uncompressed header
+ */
+static inline u16
+lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
+{
+ u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
+ u8 iphc0, iphc1, h_enc;
+
+ iphc0 = skb_network_header(skb)[0];
+ iphc1 = skb_network_header(skb)[1];
+
+ switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
+ case 0:
+ ret += 4;
+ break;
+ case 1:
+ ret += 3;
+ break;
+ case 2:
+ ret++;
+ break;
+ default:
+ break;
+ }
+
+ if (!(iphc0 & LOWPAN_IPHC_NH_C))
+ ret++;
+
+ if (!(iphc0 & 0x03))
+ ret++;
+
+ ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
+ LOWPAN_IPHC_SAM_BIT);
+
+ if (iphc1 & LOWPAN_IPHC_M) {
+ switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
+ LOWPAN_IPHC_DAM_BIT) {
+ case LOWPAN_IPHC_DAM_00:
+ ret += 16;
+ break;
+ case LOWPAN_IPHC_DAM_01:
+ ret += 6;
+ break;
+ case LOWPAN_IPHC_DAM_10:
+ ret += 4;
+ break;
+ case LOWPAN_IPHC_DAM_11:
+ ret++;
+ break;
+ default:
+ break;
+ }
+ } else {
+ ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
+ LOWPAN_IPHC_DAM_BIT);
+ }
+
+ if (iphc0 & LOWPAN_IPHC_NH_C) {
+ h_enc = skb_network_header(skb)[ret];
+ ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
+ }
+
+ if (dgram_offset)
+ *dgram_offset = uncomp_header;
+
+ return skb->len + uncomp_header - ret;
+}
+
+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__ */