Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) #ifndef __LINUX_ERSPAN_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #define __LINUX_ERSPAN_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * GRE header for ERSPAN type I encapsulation (4 octets [34:37])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *      0                   1                   2                   3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *     |0|0|0|0|0|00000|000000000|00000|    Protocol Type for ERSPAN   |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *  The Type I ERSPAN frame format is based on the barebones IP + GRE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *  encapsulation (as described above) on top of the raw mirrored frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *  There is no extra ERSPAN header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * GRE header for ERSPAN type II and II encapsulation (8 octets [34:41])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *       0                   1                   2                   3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *     |0|0|0|1|0|00000|000000000|00000|    Protocol Type for ERSPAN   |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *     |      Sequence Number (increments per packet per session)      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *  Note that in the above GRE header [RFC1701] out of the C, R, K, S,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  *  s, Recur, Flags, Version fields only S (bit 03) is set to 1. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *  other fields are set to zero, so only a sequence number follows.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *  ERSPAN Version 1 (Type II) header (8 octets [42:49])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *  0                   1                   2                   3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * |  Ver  |          VLAN         | COS | En|T|    Session ID     |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * |      Reserved         |                  Index                |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  *  ERSPAN Version 2 (Type III) header (12 octets [42:49])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  *  0                   1                   2                   3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * |  Ver  |          VLAN         | COS |BSO|T|     Session ID    |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * |                          Timestamp                            |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * |             SGT               |P|    FT   |   Hw ID   |D|Gra|O|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  *      Platform Specific SubHeader (8 octets, optional)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * |  Platf ID |               Platform Specific Info              |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * |                  Platform Specific Info                       |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * GRE proto ERSPAN type I/II = 0x88BE, type III = 0x22EB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) #include <uapi/linux/erspan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #define ERSPAN_VERSION	0x1	/* ERSPAN type II */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #define VER_MASK	0xf000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define VLAN_MASK	0x0fff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define COS_MASK	0xe000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define EN_MASK		0x1800
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #define T_MASK		0x0400
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #define ID_MASK		0x03ff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #define INDEX_MASK	0xfffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) #define ERSPAN_VERSION2	0x2	/* ERSPAN type III*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #define BSO_MASK	EN_MASK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) #define SGT_MASK	0xffff0000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) #define P_MASK		0x8000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #define FT_MASK		0x7c00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) #define HWID_MASK	0x03f0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) #define DIR_MASK	0x0008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) #define GRA_MASK	0x0006
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define O_MASK		0x0001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) #define HWID_OFFSET    4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) #define DIR_OFFSET     3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) enum erspan_encap_type {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ERSPAN_ENCAP_NOVLAN = 0x0,	/* originally without VLAN tag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	ERSPAN_ENCAP_ISL = 0x1,		/* originally ISL encapsulated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	ERSPAN_ENCAP_8021Q = 0x2,	/* originally 802.1Q encapsulated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	ERSPAN_ENCAP_INFRAME = 0x3,	/* VLAN tag perserved in frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) #define ERSPAN_V1_MDSIZE	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) #define ERSPAN_V2_MDSIZE	8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) struct erspan_base_hdr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) #if defined(__LITTLE_ENDIAN_BITFIELD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	__u8	vlan_upper:4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		ver:4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	__u8	vlan:8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	__u8	session_id_upper:2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		t:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		en:2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		cos:3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	__u8	session_id:8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #elif defined(__BIG_ENDIAN_BITFIELD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	__u8	ver: 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		vlan_upper:4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	__u8	vlan:8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	__u8	cos:3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		en:2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		t:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		session_id_upper:2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	__u8	session_id:8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #error "Please fix <asm/byteorder.h>"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	ershdr->session_id = id & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	ershdr->session_id_upper = (id >> 8) & 0x3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static inline u16 get_session_id(const struct erspan_base_hdr *ershdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return (ershdr->session_id_upper << 8) + ershdr->session_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	ershdr->vlan = vlan & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	ershdr->vlan_upper = (vlan >> 8) & 0xf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static inline u16 get_vlan(const struct erspan_base_hdr *ershdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return (ershdr->vlan_upper << 8) + ershdr->vlan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static inline void set_hwid(struct erspan_md2 *md2, u8 hwid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	md2->hwid = hwid & 0xf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	md2->hwid_upper = (hwid >> 4) & 0x3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static inline u8 get_hwid(const struct erspan_md2 *md2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return (md2->hwid_upper << 4) + md2->hwid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static inline int erspan_hdr_len(int version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (version == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	return sizeof(struct erspan_base_hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	       (version == 1 ? ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static inline u8 tos_to_cos(u8 tos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	u8 dscp, cos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	dscp = tos >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	cos = dscp >> 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	return cos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static inline void erspan_build_header(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 				u32 id, u32 index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				bool truncate, bool is_ipv4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	struct ethhdr *eth = (struct ethhdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	enum erspan_encap_type enc_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct erspan_base_hdr *ershdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct qtag_prefix {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		__be16 eth_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		__be16 tci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	} *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	u16 vlan_tci = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	u8 tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	__be32 *idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	tos = is_ipv4 ? ip_hdr(skb)->tos :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			(ipv6_hdr(skb)->priority << 4) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			(ipv6_hdr(skb)->flow_lbl[0] >> 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	enc_type = ERSPAN_ENCAP_NOVLAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	/* If mirrored packet has vlan tag, extract tci and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 *  perserve vlan header in the mirrored frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (eth->h_proto == htons(ETH_P_8021Q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		vlan_tci = ntohs(qp->tci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		enc_type = ERSPAN_ENCAP_INFRAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	skb_push(skb, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	ershdr = (struct erspan_base_hdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	/* Build base header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	ershdr->ver = ERSPAN_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	ershdr->cos = tos_to_cos(tos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	ershdr->en = enc_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	ershdr->t = truncate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	set_vlan(ershdr, vlan_tci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	set_session_id(ershdr, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	/* Build metadata */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	idx = (__be32 *)(ershdr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	*idx = htonl(index & INDEX_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /* ERSPAN GRA: timestamp granularity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  *   00b --> granularity = 100 microseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  *   01b --> granularity = 100 nanoseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  *   10b --> granularity = IEEE 1588
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * Here we only support 100 microseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static inline __be32 erspan_get_timestamp(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	u64 h_usecs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	ktime_t kt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	kt = ktime_get_real();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	h_usecs = ktime_divns(kt, 100 * NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	/* ERSPAN base header only has 32-bit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	 * so it wraps around 4 days.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	return htonl((u32)h_usecs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* ERSPAN BSO (Bad/Short/Oversized), see RFC1757
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  *   00b --> Good frame with no error, or unknown integrity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  *   01b --> Payload is a Short Frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  *   10b --> Payload is an Oversized Frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  *   11b --> Payload is a Bad Frame with CRC or Alignment Error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) enum erspan_bso {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	BSO_NOERROR = 0x0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	BSO_SHORT = 0x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	BSO_OVERSIZED = 0x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	BSO_BAD = 0x3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static inline u8 erspan_detect_bso(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	/* BSO_BAD is not handled because the frame CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	 * or alignment error information is in FCS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (skb->len < ETH_ZLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		return BSO_SHORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (skb->len > ETH_FRAME_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return BSO_OVERSIZED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return BSO_NOERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static inline void erspan_build_header_v2(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 					  u32 id, u8 direction, u16 hwid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 					  bool truncate, bool is_ipv4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	struct ethhdr *eth = (struct ethhdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	struct erspan_base_hdr *ershdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	struct erspan_md2 *md2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	struct qtag_prefix {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		__be16 eth_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		__be16 tci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	} *qp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	u16 vlan_tci = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	u8 gra = 0; /* 100 usec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	u8 bso = 0; /* Bad/Short/Oversized */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	u8 sgt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	u8 tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	tos = is_ipv4 ? ip_hdr(skb)->tos :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			(ipv6_hdr(skb)->priority << 4) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			(ipv6_hdr(skb)->flow_lbl[0] >> 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	/* Unlike v1, v2 does not have En field,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	 * so only extract vlan tci field.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (eth->h_proto == htons(ETH_P_8021Q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		vlan_tci = ntohs(qp->tci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	bso = erspan_detect_bso(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	ershdr = (struct erspan_base_hdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	/* Build base header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	ershdr->ver = ERSPAN_VERSION2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	ershdr->cos = tos_to_cos(tos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	ershdr->en = bso;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	ershdr->t = truncate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	set_vlan(ershdr, vlan_tci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	set_session_id(ershdr, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	/* Build metadata */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	md2 = (struct erspan_md2 *)(ershdr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	md2->timestamp = erspan_get_timestamp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	md2->sgt = htons(sgt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	md2->p = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	md2->ft = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	md2->dir = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	md2->gra = gra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	md2->o = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	set_hwid(md2, hwid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) #endif