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![Luiz Augusto von Dentz](/assets/img/avatar_default.png)
According to RFC 7668 U/L bit shall not be used: https://wiki.tools.ietf.org/html/rfc7668#section-3.2.2 [Page 10]: In the figure, letter 'b' represents a bit from the Bluetooth device address, copied as is without any changes on any bit. This means that no bit in the IID indicates whether the underlying Bluetooth device address is public or random. |0 1|1 3|3 4|4 6| |0 5|6 1|2 7|8 3| +----------------+----------------+----------------+----------------+ |bbbbbbbbbbbbbbbb|bbbbbbbb11111111|11111110bbbbbbbb|bbbbbbbbbbbbbbbb| +----------------+----------------+----------------+----------------+ Because of this the code cannot figure out the address type from the IP address anymore thus it makes no sense to use peer_lookup_ba as it needs the peer address type. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
330 lines
10 KiB
C
330 lines
10 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 <linux/debugfs.h>
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#include <net/ipv6.h>
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#include <net/net_namespace.h>
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/* special link-layer handling */
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#include <net/mac802154.h>
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#define EUI64_ADDR_LEN 8
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#define LOWPAN_NHC_MAX_ID_LEN 1
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/* Maximum next header compression length which we currently support inclusive
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* possible inline data.
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*/
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#define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr))
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/* Max IPHC Header len without IPv6 hdr specific inline data.
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* Useful for getting the "extra" bytes we need at worst case compression.
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*
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* LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
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*/
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#define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
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/* Maximum worst case IPHC header buffer size */
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#define LOWPAN_IPHC_MAX_HC_BUF_LEN (sizeof(struct ipv6hdr) + \
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LOWPAN_IPHC_MAX_HEADER_LEN + \
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LOWPAN_NHC_MAX_HDR_LEN)
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/* SCI/DCI is 4 bit width, so we have maximum 16 entries */
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#define LOWPAN_IPHC_CTX_TABLE_SIZE (1 << 4)
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#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
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#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
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#define LOWPAN_DISPATCH_IPHC_MASK 0xe0
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static inline bool lowpan_is_ipv6(u8 dispatch)
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{
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return dispatch == LOWPAN_DISPATCH_IPV6;
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}
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static inline bool lowpan_is_iphc(u8 dispatch)
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{
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return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
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}
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#define LOWPAN_PRIV_SIZE(llpriv_size) \
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(sizeof(struct lowpan_dev) + llpriv_size)
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enum lowpan_lltypes {
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LOWPAN_LLTYPE_BTLE,
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LOWPAN_LLTYPE_IEEE802154,
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};
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enum lowpan_iphc_ctx_flags {
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LOWPAN_IPHC_CTX_FLAG_ACTIVE,
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LOWPAN_IPHC_CTX_FLAG_COMPRESSION,
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};
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struct lowpan_iphc_ctx {
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u8 id;
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struct in6_addr pfx;
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u8 plen;
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unsigned long flags;
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};
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struct lowpan_iphc_ctx_table {
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spinlock_t lock;
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const struct lowpan_iphc_ctx_ops *ops;
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struct lowpan_iphc_ctx table[LOWPAN_IPHC_CTX_TABLE_SIZE];
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};
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static inline bool lowpan_iphc_ctx_is_active(const struct lowpan_iphc_ctx *ctx)
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{
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return test_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
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}
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static inline bool
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lowpan_iphc_ctx_is_compression(const struct lowpan_iphc_ctx *ctx)
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{
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return test_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
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}
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struct lowpan_dev {
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enum lowpan_lltypes lltype;
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struct dentry *iface_debugfs;
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struct lowpan_iphc_ctx_table ctx;
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/* must be last */
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u8 priv[0] __aligned(sizeof(void *));
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};
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struct lowpan_802154_neigh {
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__le16 short_addr;
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};
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static inline
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struct lowpan_802154_neigh *lowpan_802154_neigh(void *neigh_priv)
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{
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return neigh_priv;
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}
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static inline
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struct lowpan_dev *lowpan_dev(const struct net_device *dev)
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{
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return netdev_priv(dev);
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}
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/* private device info */
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struct lowpan_802154_dev {
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struct net_device *wdev; /* wpan device ptr */
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u16 fragment_tag;
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};
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static inline struct
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lowpan_802154_dev *lowpan_802154_dev(const struct net_device *dev)
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{
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return (struct lowpan_802154_dev *)lowpan_dev(dev)->priv;
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}
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struct lowpan_802154_cb {
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u16 d_tag;
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unsigned int d_size;
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u8 d_offset;
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};
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static inline
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struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb)
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{
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BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
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return (struct lowpan_802154_cb *)skb->cb;
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}
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static inline void lowpan_iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr,
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const void *lladdr)
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{
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/* fe:80::XXXX:XXXX:XXXX:XXXX
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* \_________________/
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* hwaddr
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*/
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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memcpy(&ipaddr->s6_addr[8], lladdr, EUI64_ADDR_LEN);
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/* second bit-flip (Universe/Local)
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* is done according RFC2464
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*/
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ipaddr->s6_addr[8] ^= 0x02;
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}
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static inline void lowpan_iphc_uncompress_eui48_lladdr(struct in6_addr *ipaddr,
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const void *lladdr)
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{
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/* fe:80::XXXX:XXff:feXX:XXXX
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* \_________________/
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* hwaddr
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*/
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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memcpy(&ipaddr->s6_addr[8], lladdr, 3);
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ipaddr->s6_addr[11] = 0xFF;
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ipaddr->s6_addr[12] = 0xFE;
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memcpy(&ipaddr->s6_addr[13], lladdr + 3, 3);
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}
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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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const 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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const 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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const unsigned char *buf, int len) { }
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static inline void raw_dump_inline(const char *caller, char *msg,
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const unsigned char *buf, int len) { }
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#endif
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/**
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* lowpan_fetch_skb - getting inline data from 6LoWPAN header
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*
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* This function will pull data from sk buffer and put it into data to
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* remove the 6LoWPAN inline data. This function returns true if the
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* sk buffer is too small to pull the amount of data which is specified
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* by len.
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*
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* @skb: the buffer where the inline data should be pulled from.
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* @data: destination buffer for the inline data.
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* @len: amount of data which should be pulled in bytes.
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*/
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static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data,
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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 bool lowpan_802154_is_valid_src_short_addr(__le16 addr)
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{
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/* First bit of addr is multicast, reserved or 802.15.4 specific */
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return !(addr & cpu_to_le16(0x8000));
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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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int lowpan_register_netdevice(struct net_device *dev,
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enum lowpan_lltypes lltype);
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int lowpan_register_netdev(struct net_device *dev,
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enum lowpan_lltypes lltype);
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void lowpan_unregister_netdevice(struct net_device *dev);
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void lowpan_unregister_netdev(struct net_device *dev);
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/**
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* lowpan_header_decompress - replace 6LoWPAN header with IPv6 header
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*
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* This function replaces the IPHC 6LoWPAN header which should be pointed at
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* skb->data and skb_network_header, with the IPv6 header.
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* It would be nice that the caller have the necessary headroom of IPv6 header
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* and greatest Transport layer header, this would reduce the overhead for
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* reallocate headroom.
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*
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* @skb: the buffer which should be manipulate.
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* @dev: the lowpan net device pointer.
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* @daddr: destination lladdr of mac header which is used for compression
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* methods.
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* @saddr: source lladdr of mac header which is used for compression
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* methods.
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*/
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int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev,
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const void *daddr, const void *saddr);
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/**
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* lowpan_header_compress - replace IPv6 header with 6LoWPAN header
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*
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* This function replaces the IPv6 header which should be pointed at
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* skb->data and skb_network_header, with the IPHC 6LoWPAN header.
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* The caller need to be sure that the sk buffer is not shared and at have
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* at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN,
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* which is the IPHC "more bytes than IPv6 header" at worst case.
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*
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* @skb: the buffer which should be manipulate.
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* @dev: the lowpan net device pointer.
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* @daddr: destination lladdr of mac header which is used for compression
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* methods.
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* @saddr: source lladdr of mac header which is used for compression
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* methods.
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*/
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int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
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const void *daddr, const void *saddr);
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#endif /* __6LOWPAN_H__ */
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