| #ifndef __LINUX_ERSPAN_H |
| #define __LINUX_ERSPAN_H |
| |
| /* |
| * GRE header for ERSPAN encapsulation (8 octets [34:41]) -- 8 bytes |
| * 0 1 2 3 |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Sequence Number (increments per packet per session) | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * Note that in the above GRE header [RFC1701] out of the C, R, K, S, |
| * s, Recur, Flags, Version fields only S (bit 03) is set to 1. The |
| * other fields are set to zero, so only a sequence number follows. |
| * |
| * ERSPAN Version 1 (Type II) header (8 octets [42:49]) |
| * 0 1 2 3 |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Ver | VLAN | COS | En|T| Session ID | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Reserved | Index | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * |
| * ERSPAN Version 2 (Type III) header (12 octets [42:49]) |
| * 0 1 2 3 |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Ver | VLAN | COS |BSO|T| Session ID | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Timestamp | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | SGT |P| FT | Hw ID |D|Gra|O| |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * Platform Specific SubHeader (8 octets, optional) |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Platf ID | Platform Specific Info | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | Platform Specific Info | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |
| * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB |
| */ |
| |
| #include <uapi/linux/erspan.h> |
| |
| #define ERSPAN_VERSION 0x1 /* ERSPAN type II */ |
| #define VER_MASK 0xf000 |
| #define VLAN_MASK 0x0fff |
| #define COS_MASK 0xe000 |
| #define EN_MASK 0x1800 |
| #define T_MASK 0x0400 |
| #define ID_MASK 0x03ff |
| #define INDEX_MASK 0xfffff |
| |
| #define ERSPAN_VERSION2 0x2 /* ERSPAN type III*/ |
| #define BSO_MASK EN_MASK |
| #define SGT_MASK 0xffff0000 |
| #define P_MASK 0x8000 |
| #define FT_MASK 0x7c00 |
| #define HWID_MASK 0x03f0 |
| #define DIR_MASK 0x0008 |
| #define GRA_MASK 0x0006 |
| #define O_MASK 0x0001 |
| |
| #define HWID_OFFSET 4 |
| #define DIR_OFFSET 3 |
| |
| enum erspan_encap_type { |
| ERSPAN_ENCAP_NOVLAN = 0x0, /* originally without VLAN tag */ |
| ERSPAN_ENCAP_ISL = 0x1, /* originally ISL encapsulated */ |
| ERSPAN_ENCAP_8021Q = 0x2, /* originally 802.1Q encapsulated */ |
| ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ |
| }; |
| |
| #define ERSPAN_V1_MDSIZE 4 |
| #define ERSPAN_V2_MDSIZE 8 |
| |
| struct erspan_base_hdr { |
| #if defined(__LITTLE_ENDIAN_BITFIELD) |
| __u8 vlan_upper:4, |
| ver:4; |
| __u8 vlan:8; |
| __u8 session_id_upper:2, |
| t:1, |
| en:2, |
| cos:3; |
| __u8 session_id:8; |
| #elif defined(__BIG_ENDIAN_BITFIELD) |
| __u8 ver: 4, |
| vlan_upper:4; |
| __u8 vlan:8; |
| __u8 cos:3, |
| en:2, |
| t:1, |
| session_id_upper:2; |
| __u8 session_id:8; |
| #else |
| #error "Please fix <asm/byteorder.h>" |
| #endif |
| }; |
| |
| static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id) |
| { |
| ershdr->session_id = id & 0xff; |
| ershdr->session_id_upper = (id >> 8) & 0x3; |
| } |
| |
| static inline u16 get_session_id(const struct erspan_base_hdr *ershdr) |
| { |
| return (ershdr->session_id_upper << 8) + ershdr->session_id; |
| } |
| |
| static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan) |
| { |
| ershdr->vlan = vlan & 0xff; |
| ershdr->vlan_upper = (vlan >> 8) & 0xf; |
| } |
| |
| static inline u16 get_vlan(const struct erspan_base_hdr *ershdr) |
| { |
| return (ershdr->vlan_upper << 8) + ershdr->vlan; |
| } |
| |
| static inline void set_hwid(struct erspan_md2 *md2, u8 hwid) |
| { |
| md2->hwid = hwid & 0xf; |
| md2->hwid_upper = (hwid >> 4) & 0x3; |
| } |
| |
| static inline u8 get_hwid(const struct erspan_md2 *md2) |
| { |
| return (md2->hwid_upper << 4) + md2->hwid; |
| } |
| |
| static inline int erspan_hdr_len(int version) |
| { |
| return sizeof(struct erspan_base_hdr) + |
| (version == 1 ? ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE); |
| } |
| |
| static inline u8 tos_to_cos(u8 tos) |
| { |
| u8 dscp, cos; |
| |
| dscp = tos >> 2; |
| cos = dscp >> 3; |
| return cos; |
| } |
| |
| static inline void erspan_build_header(struct sk_buff *skb, |
| u32 id, u32 index, |
| bool truncate, bool is_ipv4) |
| { |
| struct ethhdr *eth = (struct ethhdr *)skb->data; |
| enum erspan_encap_type enc_type; |
| struct erspan_base_hdr *ershdr; |
| struct qtag_prefix { |
| __be16 eth_type; |
| __be16 tci; |
| } *qp; |
| u16 vlan_tci = 0; |
| u8 tos; |
| __be32 *idx; |
| |
| tos = is_ipv4 ? ip_hdr(skb)->tos : |
| (ipv6_hdr(skb)->priority << 4) + |
| (ipv6_hdr(skb)->flow_lbl[0] >> 4); |
| |
| enc_type = ERSPAN_ENCAP_NOVLAN; |
| |
| /* If mirrored packet has vlan tag, extract tci and |
| * perserve vlan header in the mirrored frame. |
| */ |
| if (eth->h_proto == htons(ETH_P_8021Q)) { |
| qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); |
| vlan_tci = ntohs(qp->tci); |
| enc_type = ERSPAN_ENCAP_INFRAME; |
| } |
| |
| skb_push(skb, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); |
| ershdr = (struct erspan_base_hdr *)skb->data; |
| memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); |
| |
| /* Build base header */ |
| ershdr->ver = ERSPAN_VERSION; |
| ershdr->cos = tos_to_cos(tos); |
| ershdr->en = enc_type; |
| ershdr->t = truncate; |
| set_vlan(ershdr, vlan_tci); |
| set_session_id(ershdr, id); |
| |
| /* Build metadata */ |
| idx = (__be32 *)(ershdr + 1); |
| *idx = htonl(index & INDEX_MASK); |
| } |
| |
| /* ERSPAN GRA: timestamp granularity |
| * 00b --> granularity = 100 microseconds |
| * 01b --> granularity = 100 nanoseconds |
| * 10b --> granularity = IEEE 1588 |
| * Here we only support 100 microseconds. |
| */ |
| static inline __be32 erspan_get_timestamp(void) |
| { |
| u64 h_usecs; |
| ktime_t kt; |
| |
| kt = ktime_get_real(); |
| h_usecs = ktime_divns(kt, 100 * NSEC_PER_USEC); |
| |
| /* ERSPAN base header only has 32-bit, |
| * so it wraps around 4 days. |
| */ |
| return htonl((u32)h_usecs); |
| } |
| |
| /* ERSPAN BSO (Bad/Short/Oversized), see RFC1757 |
| * 00b --> Good frame with no error, or unknown integrity |
| * 01b --> Payload is a Short Frame |
| * 10b --> Payload is an Oversized Frame |
| * 11b --> Payload is a Bad Frame with CRC or Alignment Error |
| */ |
| enum erspan_bso { |
| BSO_NOERROR = 0x0, |
| BSO_SHORT = 0x1, |
| BSO_OVERSIZED = 0x2, |
| BSO_BAD = 0x3, |
| }; |
| |
| static inline u8 erspan_detect_bso(struct sk_buff *skb) |
| { |
| /* BSO_BAD is not handled because the frame CRC |
| * or alignment error information is in FCS. |
| */ |
| if (skb->len < ETH_ZLEN) |
| return BSO_SHORT; |
| |
| if (skb->len > ETH_FRAME_LEN) |
| return BSO_OVERSIZED; |
| |
| return BSO_NOERROR; |
| } |
| |
| static inline void erspan_build_header_v2(struct sk_buff *skb, |
| u32 id, u8 direction, u16 hwid, |
| bool truncate, bool is_ipv4) |
| { |
| struct ethhdr *eth = (struct ethhdr *)skb->data; |
| struct erspan_base_hdr *ershdr; |
| struct erspan_md2 *md2; |
| struct qtag_prefix { |
| __be16 eth_type; |
| __be16 tci; |
| } *qp; |
| u16 vlan_tci = 0; |
| u8 gra = 0; /* 100 usec */ |
| u8 bso = 0; /* Bad/Short/Oversized */ |
| u8 sgt = 0; |
| u8 tos; |
| |
| tos = is_ipv4 ? ip_hdr(skb)->tos : |
| (ipv6_hdr(skb)->priority << 4) + |
| (ipv6_hdr(skb)->flow_lbl[0] >> 4); |
| |
| /* Unlike v1, v2 does not have En field, |
| * so only extract vlan tci field. |
| */ |
| if (eth->h_proto == htons(ETH_P_8021Q)) { |
| qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); |
| vlan_tci = ntohs(qp->tci); |
| } |
| |
| bso = erspan_detect_bso(skb); |
| skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); |
| ershdr = (struct erspan_base_hdr *)skb->data; |
| memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); |
| |
| /* Build base header */ |
| ershdr->ver = ERSPAN_VERSION2; |
| ershdr->cos = tos_to_cos(tos); |
| ershdr->en = bso; |
| ershdr->t = truncate; |
| set_vlan(ershdr, vlan_tci); |
| set_session_id(ershdr, id); |
| |
| /* Build metadata */ |
| md2 = (struct erspan_md2 *)(ershdr + 1); |
| md2->timestamp = erspan_get_timestamp(); |
| md2->sgt = htons(sgt); |
| md2->p = 1; |
| md2->ft = 0; |
| md2->dir = direction; |
| md2->gra = gra; |
| md2->o = 0; |
| set_hwid(md2, hwid); |
| } |
| |
| #endif |