87a93e4ece
This patch cleanups needed_headroom, needed_tailroom and hard_header_len fields for wpan and lowpan interfaces. For wpan interfaces the worst case mac header len should be part of needed_headroom, currently this is set as hard_header_len, but hard_header_len should be set to the minimum header length which xmit call assumes and this is the minimum frame length of 802.15.4. The hard_header_len value will check inside send callbacl of AF_PACKET raw sockets. For lowpan interfaces, if fragmentation isn't needed the skb will call dev_hard_header for 802154 layer and queue it afterwards. This happens without new skb allocation, so we need the same headroom and tailroom lengths like 802154 inside 802154 6lowpan layer. At least we assume as minimum header length an ipv6 header size. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
286 lines
9.4 KiB
C
286 lines
9.4 KiB
C
/*
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* IEEE802.15.4-2003 specification
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*
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* Copyright (C) 2007, 2008 Siemens AG
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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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* Written by:
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* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Maxim Osipov <maxim.osipov@siemens.com>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#ifndef LINUX_IEEE802154_H
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#define LINUX_IEEE802154_H
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#include <linux/types.h>
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#include <linux/random.h>
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#include <asm/byteorder.h>
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#define IEEE802154_MTU 127
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#define IEEE802154_ACK_PSDU_LEN 5
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#define IEEE802154_MIN_PSDU_LEN 9
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#define IEEE802154_FCS_LEN 2
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#define IEEE802154_MAX_AUTH_TAG_LEN 16
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/* General MAC frame format:
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* 2 bytes: Frame Control
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* 1 byte: Sequence Number
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* 20 bytes: Addressing fields
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* 14 bytes: Auxiliary Security Header
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*/
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#define IEEE802154_MAX_HEADER_LEN (2 + 1 + 20 + 14)
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#define IEEE802154_MIN_HEADER_LEN (IEEE802154_ACK_PSDU_LEN - \
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IEEE802154_FCS_LEN)
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#define IEEE802154_PAN_ID_BROADCAST 0xffff
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#define IEEE802154_ADDR_SHORT_BROADCAST 0xffff
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#define IEEE802154_ADDR_SHORT_UNSPEC 0xfffe
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#define IEEE802154_EXTENDED_ADDR_LEN 8
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#define IEEE802154_LIFS_PERIOD 40
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#define IEEE802154_SIFS_PERIOD 12
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#define IEEE802154_MAX_SIFS_FRAME_SIZE 18
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#define IEEE802154_MAX_CHANNEL 26
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#define IEEE802154_MAX_PAGE 31
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#define IEEE802154_FC_TYPE_BEACON 0x0 /* Frame is beacon */
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#define IEEE802154_FC_TYPE_DATA 0x1 /* Frame is data */
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#define IEEE802154_FC_TYPE_ACK 0x2 /* Frame is acknowledgment */
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#define IEEE802154_FC_TYPE_MAC_CMD 0x3 /* Frame is MAC command */
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#define IEEE802154_FC_TYPE_SHIFT 0
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#define IEEE802154_FC_TYPE_MASK ((1 << 3) - 1)
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#define IEEE802154_FC_TYPE(x) ((x & IEEE802154_FC_TYPE_MASK) >> IEEE802154_FC_TYPE_SHIFT)
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#define IEEE802154_FC_SET_TYPE(v, x) do { \
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v = (((v) & ~IEEE802154_FC_TYPE_MASK) | \
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(((x) << IEEE802154_FC_TYPE_SHIFT) & IEEE802154_FC_TYPE_MASK)); \
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} while (0)
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#define IEEE802154_FC_SECEN_SHIFT 3
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#define IEEE802154_FC_SECEN (1 << IEEE802154_FC_SECEN_SHIFT)
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#define IEEE802154_FC_FRPEND_SHIFT 4
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#define IEEE802154_FC_FRPEND (1 << IEEE802154_FC_FRPEND_SHIFT)
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#define IEEE802154_FC_ACK_REQ_SHIFT 5
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#define IEEE802154_FC_ACK_REQ (1 << IEEE802154_FC_ACK_REQ_SHIFT)
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#define IEEE802154_FC_INTRA_PAN_SHIFT 6
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#define IEEE802154_FC_INTRA_PAN (1 << IEEE802154_FC_INTRA_PAN_SHIFT)
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#define IEEE802154_FC_SAMODE_SHIFT 14
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#define IEEE802154_FC_SAMODE_MASK (3 << IEEE802154_FC_SAMODE_SHIFT)
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#define IEEE802154_FC_DAMODE_SHIFT 10
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#define IEEE802154_FC_DAMODE_MASK (3 << IEEE802154_FC_DAMODE_SHIFT)
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#define IEEE802154_FC_VERSION_SHIFT 12
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#define IEEE802154_FC_VERSION_MASK (3 << IEEE802154_FC_VERSION_SHIFT)
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#define IEEE802154_FC_VERSION(x) ((x & IEEE802154_FC_VERSION_MASK) >> IEEE802154_FC_VERSION_SHIFT)
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#define IEEE802154_FC_SAMODE(x) \
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(((x) & IEEE802154_FC_SAMODE_MASK) >> IEEE802154_FC_SAMODE_SHIFT)
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#define IEEE802154_FC_DAMODE(x) \
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(((x) & IEEE802154_FC_DAMODE_MASK) >> IEEE802154_FC_DAMODE_SHIFT)
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#define IEEE802154_SCF_SECLEVEL_MASK 7
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#define IEEE802154_SCF_SECLEVEL_SHIFT 0
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#define IEEE802154_SCF_SECLEVEL(x) (x & IEEE802154_SCF_SECLEVEL_MASK)
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#define IEEE802154_SCF_KEY_ID_MODE_SHIFT 3
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#define IEEE802154_SCF_KEY_ID_MODE_MASK (3 << IEEE802154_SCF_KEY_ID_MODE_SHIFT)
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#define IEEE802154_SCF_KEY_ID_MODE(x) \
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((x & IEEE802154_SCF_KEY_ID_MODE_MASK) >> IEEE802154_SCF_KEY_ID_MODE_SHIFT)
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#define IEEE802154_SCF_KEY_IMPLICIT 0
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#define IEEE802154_SCF_KEY_INDEX 1
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#define IEEE802154_SCF_KEY_SHORT_INDEX 2
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#define IEEE802154_SCF_KEY_HW_INDEX 3
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#define IEEE802154_SCF_SECLEVEL_NONE 0
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#define IEEE802154_SCF_SECLEVEL_MIC32 1
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#define IEEE802154_SCF_SECLEVEL_MIC64 2
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#define IEEE802154_SCF_SECLEVEL_MIC128 3
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#define IEEE802154_SCF_SECLEVEL_ENC 4
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#define IEEE802154_SCF_SECLEVEL_ENC_MIC32 5
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#define IEEE802154_SCF_SECLEVEL_ENC_MIC64 6
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#define IEEE802154_SCF_SECLEVEL_ENC_MIC128 7
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/* MAC footer size */
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#define IEEE802154_MFR_SIZE 2 /* 2 octets */
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/* MAC's Command Frames Identifiers */
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#define IEEE802154_CMD_ASSOCIATION_REQ 0x01
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#define IEEE802154_CMD_ASSOCIATION_RESP 0x02
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#define IEEE802154_CMD_DISASSOCIATION_NOTIFY 0x03
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#define IEEE802154_CMD_DATA_REQ 0x04
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#define IEEE802154_CMD_PANID_CONFLICT_NOTIFY 0x05
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#define IEEE802154_CMD_ORPHAN_NOTIFY 0x06
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#define IEEE802154_CMD_BEACON_REQ 0x07
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#define IEEE802154_CMD_COORD_REALIGN_NOTIFY 0x08
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#define IEEE802154_CMD_GTS_REQ 0x09
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/*
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* The return values of MAC operations
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*/
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enum {
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/*
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* The requested operation was completed successfully.
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* For a transmission request, this value indicates
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* a successful transmission.
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*/
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IEEE802154_SUCCESS = 0x0,
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/* The beacon was lost following a synchronization request. */
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IEEE802154_BEACON_LOSS = 0xe0,
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/*
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* A transmission could not take place due to activity on the
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* channel, i.e., the CSMA-CA mechanism has failed.
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*/
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IEEE802154_CHNL_ACCESS_FAIL = 0xe1,
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/* The GTS request has been denied by the PAN coordinator. */
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IEEE802154_DENINED = 0xe2,
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/* The attempt to disable the transceiver has failed. */
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IEEE802154_DISABLE_TRX_FAIL = 0xe3,
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/*
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* The received frame induces a failed security check according to
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* the security suite.
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*/
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IEEE802154_FAILED_SECURITY_CHECK = 0xe4,
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/*
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* The frame resulting from secure processing has a length that is
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* greater than aMACMaxFrameSize.
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*/
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IEEE802154_FRAME_TOO_LONG = 0xe5,
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/*
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* The requested GTS transmission failed because the specified GTS
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* either did not have a transmit GTS direction or was not defined.
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*/
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IEEE802154_INVALID_GTS = 0xe6,
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/*
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* A request to purge an MSDU from the transaction queue was made using
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* an MSDU handle that was not found in the transaction table.
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*/
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IEEE802154_INVALID_HANDLE = 0xe7,
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/* A parameter in the primitive is out of the valid range.*/
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IEEE802154_INVALID_PARAMETER = 0xe8,
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/* No acknowledgment was received after aMaxFrameRetries. */
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IEEE802154_NO_ACK = 0xe9,
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/* A scan operation failed to find any network beacons.*/
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IEEE802154_NO_BEACON = 0xea,
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/* No response data were available following a request. */
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IEEE802154_NO_DATA = 0xeb,
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/* The operation failed because a short address was not allocated. */
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IEEE802154_NO_SHORT_ADDRESS = 0xec,
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/*
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* A receiver enable request was unsuccessful because it could not be
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* completed within the CAP.
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*/
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IEEE802154_OUT_OF_CAP = 0xed,
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/*
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* A PAN identifier conflict has been detected and communicated to the
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* PAN coordinator.
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*/
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IEEE802154_PANID_CONFLICT = 0xee,
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/* A coordinator realignment command has been received. */
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IEEE802154_REALIGMENT = 0xef,
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/* The transaction has expired and its information discarded. */
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IEEE802154_TRANSACTION_EXPIRED = 0xf0,
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/* There is no capacity to store the transaction. */
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IEEE802154_TRANSACTION_OVERFLOW = 0xf1,
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/*
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* The transceiver was in the transmitter enabled state when the
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* receiver was requested to be enabled.
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*/
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IEEE802154_TX_ACTIVE = 0xf2,
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/* The appropriate key is not available in the ACL. */
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IEEE802154_UNAVAILABLE_KEY = 0xf3,
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/*
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* A SET/GET request was issued with the identifier of a PIB attribute
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* that is not supported.
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*/
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IEEE802154_UNSUPPORTED_ATTR = 0xf4,
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/*
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* A request to perform a scan operation failed because the MLME was
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* in the process of performing a previously initiated scan operation.
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*/
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IEEE802154_SCAN_IN_PROGRESS = 0xfc,
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};
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/* frame control handling */
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#define IEEE802154_FCTL_FTYPE 0x0003
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#define IEEE802154_FCTL_INTRA_PAN 0x0040
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#define IEEE802154_FTYPE_DATA 0x0001
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/*
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* ieee802154_is_data - check if type is IEEE802154_FTYPE_DATA
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* @fc: frame control bytes in little-endian byteorder
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*/
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static inline int ieee802154_is_data(__le16 fc)
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{
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return (fc & cpu_to_le16(IEEE802154_FCTL_FTYPE)) ==
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cpu_to_le16(IEEE802154_FTYPE_DATA);
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}
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/**
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* ieee802154_is_intra_pan - check if intra pan id communication
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* @fc: frame control bytes in little-endian byteorder
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*/
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static inline bool ieee802154_is_intra_pan(__le16 fc)
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{
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return fc & cpu_to_le16(IEEE802154_FCTL_INTRA_PAN);
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}
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/**
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* ieee802154_is_valid_psdu_len - check if psdu len is valid
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* available lengths:
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* 0-4 Reserved
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* 5 MPDU (Acknowledgment)
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* 6-8 Reserved
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* 9-127 MPDU
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*
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* @len: psdu len with (MHR + payload + MFR)
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*/
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static inline bool ieee802154_is_valid_psdu_len(const u8 len)
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{
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return (len == IEEE802154_ACK_PSDU_LEN ||
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(len >= IEEE802154_MIN_PSDU_LEN && len <= IEEE802154_MTU));
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}
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/**
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* ieee802154_is_valid_psdu_len - check if extended addr is valid
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* @addr: extended addr to check
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*/
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static inline bool ieee802154_is_valid_extended_unicast_addr(const __le64 addr)
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{
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/* Bail out if the address is all zero, or if the group
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* address bit is set.
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*/
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return ((addr != cpu_to_le64(0x0000000000000000ULL)) &&
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!(addr & cpu_to_le64(0x0100000000000000ULL)));
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}
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/**
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* ieee802154_random_extended_addr - generates a random extended address
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* @addr: extended addr pointer to place the random address
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*/
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static inline void ieee802154_random_extended_addr(__le64 *addr)
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{
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get_random_bytes(addr, IEEE802154_EXTENDED_ADDR_LEN);
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/* clear the group bit, and set the locally administered bit */
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((u8 *)addr)[IEEE802154_EXTENDED_ADDR_LEN - 1] &= ~0x01;
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((u8 *)addr)[IEEE802154_EXTENDED_ADDR_LEN - 1] |= 0x02;
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}
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#endif /* LINUX_IEEE802154_H */
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