Initial import

1 files changed, 385 insertions, 0 deletions

diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
new file mode 100644
index 000000000..dc03d77ad
--- /dev/null
+++ b/include/net/6lowpan.h
@@ -0,0 +1,385 @@
+/*
+ * 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>
+#include <net/net_namespace.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]))
+
+/*
+ * 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))
+
+/* check whether the 112-bit gid of the multicast address is mappable to: */
+
+/* 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
+
+/*
+ * 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 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;
+}
+
+int
+lowpan_header_decompress(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);
+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__ */