forked from mirrors/linux
be754f6435
The csum_value field in the rmnet_map_dl_csum_trailer structure is a "real" Internet checksum. It is a 16 bit value, in big endian format, which represents an inverted ones' complement sum over pairs of bytes. Make that clear by changing its type to __sum16. This makes a typecast in rmnet_map_ipv4_dl_csum_trailer() and another in rmnet_map_ipv6_dl_csum_trailer() unnecessary. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
72 lines
2 KiB
C
72 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only
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* Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
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*/
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#ifndef _LINUX_IF_RMNET_H_
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#define _LINUX_IF_RMNET_H_
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struct rmnet_map_header {
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u8 flags; /* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
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u8 mux_id;
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__be16 pkt_len; /* Length of packet, including pad */
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} __aligned(1);
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/* rmnet_map_header flags field:
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* PAD_LEN: number of pad bytes following packet data
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* CMD: 1 = packet contains a MAP command; 0 = packet contains data
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* NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
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*/
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#define MAP_PAD_LEN_MASK GENMASK(5, 0)
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#define MAP_NEXT_HEADER_FLAG BIT(6)
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#define MAP_CMD_FLAG BIT(7)
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struct rmnet_map_dl_csum_trailer {
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u8 reserved1;
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u8 flags; /* MAP_CSUM_DL_VALID_FLAG */
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__be16 csum_start_offset;
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__be16 csum_length;
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__sum16 csum_value;
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} __aligned(1);
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/* rmnet_map_dl_csum_trailer flags field:
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* VALID: 1 = checksum and length valid; 0 = ignore them
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*/
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#define MAP_CSUM_DL_VALID_FLAG BIT(0)
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struct rmnet_map_ul_csum_header {
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__be16 csum_start_offset;
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__be16 csum_info; /* MAP_CSUM_UL_* */
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} __aligned(1);
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/* csum_info field:
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* OFFSET: where (offset in bytes) to insert computed checksum
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* UDP: 1 = UDP checksum (zero checkum means no checksum)
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* ENABLED: 1 = checksum computation requested
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*/
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#define MAP_CSUM_UL_OFFSET_MASK GENMASK(13, 0)
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#define MAP_CSUM_UL_UDP_FLAG BIT(14)
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#define MAP_CSUM_UL_ENABLED_FLAG BIT(15)
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/* MAP CSUM headers */
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struct rmnet_map_v5_csum_header {
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u8 header_info;
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u8 csum_info;
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__be16 reserved;
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} __aligned(1);
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/* v5 header_info field
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* NEXT_HEADER: represents whether there is any next header
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* HEADER_TYPE: represents the type of this header
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*
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* csum_info field
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* CSUM_VALID_OR_REQ:
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* 1 = for UL, checksum computation is requested.
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* 1 = for DL, validated the checksum and has found it valid
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*/
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#define MAPV5_HDRINFO_NXT_HDR_FLAG BIT(0)
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#define MAPV5_HDRINFO_HDR_TYPE_FMASK GENMASK(7, 1)
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#define MAPV5_CSUMINFO_VALID_FLAG BIT(7)
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#define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
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#endif /* !(_LINUX_IF_RMNET_H_) */
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