include/linux/if_rmnet.h

   1 /* SPDX-License-Identifier: GPL-2.0-only
   2  * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
   3  */
   4
   5 #ifndef _LINUX_IF_RMNET_H_
   6 #define _LINUX_IF_RMNET_H_
   7
   8 struct rmnet_map_header {
   9         u8 flags;                       /* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
  10         u8 mux_id;
  11         __be16 pkt_len;                 /* Length of packet, including pad */
  12 }  __aligned(1);
  13
  14 /* rmnet_map_header flags field:
  15  *  PAD_LEN:      number of pad bytes following packet data
  16  *  CMD:          1 = packet contains a MAP command; 0 = packet contains data
  17  *  NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
  18  */
  19 #define MAP_PAD_LEN_MASK                GENMASK(5, 0)
  20 #define MAP_NEXT_HEADER_FLAG            BIT(6)
  21 #define MAP_CMD_FLAG                    BIT(7)
  22
  23 struct rmnet_map_dl_csum_trailer {
  24         u8 reserved1;
  25         u8 flags;                       /* MAP_CSUM_DL_VALID_FLAG */
  26         __be16 csum_start_offset;
  27         __be16 csum_length;
  28         __sum16 csum_value;
  29 } __aligned(1);
  30
  31 /* rmnet_map_dl_csum_trailer flags field:
  32  *  VALID:      1 = checksum and length valid; 0 = ignore them
  33  */
  34 #define MAP_CSUM_DL_VALID_FLAG          BIT(0)
  35
  36 struct rmnet_map_ul_csum_header {
  37         __be16 csum_start_offset;
  38         __be16 csum_info;               /* MAP_CSUM_UL_* */
  39 } __aligned(1);
  40
  41 /* csum_info field:
  42  *  OFFSET:     where (offset in bytes) to insert computed checksum
  43  *  UDP:        1 = UDP checksum (zero checkum means no checksum)
  44  *  ENABLED:    1 = checksum computation requested
  45  */
  46 #define MAP_CSUM_UL_OFFSET_MASK         GENMASK(13, 0)
  47 #define MAP_CSUM_UL_UDP_FLAG            BIT(14)
  48 #define MAP_CSUM_UL_ENABLED_FLAG        BIT(15)
  49
  50 /* MAP CSUM headers */
  51 struct rmnet_map_v5_csum_header {
  52         u8 header_info;
  53         u8 csum_info;
  54         __be16 reserved;
  55 } __aligned(1);
  56
  57 /* v5 header_info field
  58  * NEXT_HEADER: represents whether there is any next header
  59  * HEADER_TYPE: represents the type of this header
  60  *
  61  * csum_info field
  62  * CSUM_VALID_OR_REQ:
  63  * 1 = for UL, checksum computation is requested.
  64  * 1 = for DL, validated the checksum and has found it valid
  65  */
  66
  67 #define MAPV5_HDRINFO_NXT_HDR_FLAG      BIT(0)
  68 #define MAPV5_HDRINFO_HDR_TYPE_FMASK    GENMASK(7, 1)
  69 #define MAPV5_CSUMINFO_VALID_FLAG       BIT(7)
  70
  71 #define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
  72 #endif /* !(_LINUX_IF_RMNET_H_) */