xref: /linux/include/linux/if_rmnet.h (revision 9410645520e9b820069761f3450ef6661418e279)
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  #include <linux/types.h>
9  
10  struct rmnet_map_header {
11  	u8 flags;			/* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
12  	u8 mux_id;
13  	__be16 pkt_len;			/* Length of packet, including pad */
14  }  __aligned(1);
15  
16  /* rmnet_map_header flags field:
17   *  PAD_LEN:	  number of pad bytes following packet data
18   *  CMD:	  1 = packet contains a MAP command; 0 = packet contains data
19   *  NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
20   */
21  #define MAP_PAD_LEN_MASK		GENMASK(5, 0)
22  #define MAP_NEXT_HEADER_FLAG		BIT(6)
23  #define MAP_CMD_FLAG			BIT(7)
24  
25  struct rmnet_map_dl_csum_trailer {
26  	u8 reserved1;
27  	u8 flags;			/* MAP_CSUM_DL_VALID_FLAG */
28  	__be16 csum_start_offset;
29  	__be16 csum_length;
30  	__sum16 csum_value;
31  } __aligned(1);
32  
33  /* rmnet_map_dl_csum_trailer flags field:
34   *  VALID:	1 = checksum and length valid; 0 = ignore them
35   */
36  #define MAP_CSUM_DL_VALID_FLAG		BIT(0)
37  
38  struct rmnet_map_ul_csum_header {
39  	__be16 csum_start_offset;
40  	__be16 csum_info;		/* MAP_CSUM_UL_* */
41  } __aligned(1);
42  
43  /* csum_info field:
44   *  OFFSET:	where (offset in bytes) to insert computed checksum
45   *  UDP:	1 = UDP checksum (zero checksum means no checksum)
46   *  ENABLED:	1 = checksum computation requested
47   */
48  #define MAP_CSUM_UL_OFFSET_MASK		GENMASK(13, 0)
49  #define MAP_CSUM_UL_UDP_FLAG		BIT(14)
50  #define MAP_CSUM_UL_ENABLED_FLAG	BIT(15)
51  
52  /* MAP CSUM headers */
53  struct rmnet_map_v5_csum_header {
54  	u8 header_info;
55  	u8 csum_info;
56  	__be16 reserved;
57  } __aligned(1);
58  
59  /* v5 header_info field
60   * NEXT_HEADER: represents whether there is any next header
61   * HEADER_TYPE: represents the type of this header
62   *
63   * csum_info field
64   * CSUM_VALID_OR_REQ:
65   * 1 = for UL, checksum computation is requested.
66   * 1 = for DL, validated the checksum and has found it valid
67   */
68  
69  #define MAPV5_HDRINFO_NXT_HDR_FLAG	BIT(0)
70  #define MAPV5_HDRINFO_HDR_TYPE_FMASK	GENMASK(7, 1)
71  #define MAPV5_CSUMINFO_VALID_FLAG	BIT(7)
72  
73  #define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
74  #endif /* !(_LINUX_IF_RMNET_H_) */
75