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318 lines
9.0 KiB
318 lines
9.0 KiB
#ifndef __LINUX_ERSPAN_H |
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#define __LINUX_ERSPAN_H |
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/* |
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* GRE header for ERSPAN type I encapsulation (4 octets [34:37]) |
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* 0 1 2 3 |
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* 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 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |0|0|0|0|0|00000|000000000|00000| Protocol Type for ERSPAN | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* The Type I ERSPAN frame format is based on the barebones IP + GRE |
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* encapsulation (as described above) on top of the raw mirrored frame. |
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* There is no extra ERSPAN header. |
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* |
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* |
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* GRE header for ERSPAN type II and II encapsulation (8 octets [34:41]) |
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* 0 1 2 3 |
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* 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 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Sequence Number (increments per packet per session) | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* Note that in the above GRE header [RFC1701] out of the C, R, K, S, |
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* s, Recur, Flags, Version fields only S (bit 03) is set to 1. The |
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* other fields are set to zero, so only a sequence number follows. |
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* |
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* ERSPAN Version 1 (Type II) header (8 octets [42:49]) |
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* 0 1 2 3 |
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* 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 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Ver | VLAN | COS | En|T| Session ID | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Reserved | Index | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* |
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* ERSPAN Version 2 (Type III) header (12 octets [42:49]) |
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* 0 1 2 3 |
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* 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 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Ver | VLAN | COS |BSO|T| Session ID | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Timestamp | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | SGT |P| FT | Hw ID |D|Gra|O| |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* Platform Specific SubHeader (8 octets, optional) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Platf ID | Platform Specific Info | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Platform Specific Info | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |
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* GRE proto ERSPAN type I/II = 0x88BE, type III = 0x22EB |
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*/ |
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#include <uapi/linux/erspan.h> |
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#define ERSPAN_VERSION 0x1 /* ERSPAN type II */ |
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#define VER_MASK 0xf000 |
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#define VLAN_MASK 0x0fff |
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#define COS_MASK 0xe000 |
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#define EN_MASK 0x1800 |
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#define T_MASK 0x0400 |
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#define ID_MASK 0x03ff |
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#define INDEX_MASK 0xfffff |
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#define ERSPAN_VERSION2 0x2 /* ERSPAN type III*/ |
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#define BSO_MASK EN_MASK |
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#define SGT_MASK 0xffff0000 |
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#define P_MASK 0x8000 |
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#define FT_MASK 0x7c00 |
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#define HWID_MASK 0x03f0 |
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#define DIR_MASK 0x0008 |
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#define GRA_MASK 0x0006 |
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#define O_MASK 0x0001 |
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#define HWID_OFFSET 4 |
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#define DIR_OFFSET 3 |
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enum erspan_encap_type { |
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ERSPAN_ENCAP_NOVLAN = 0x0, /* originally without VLAN tag */ |
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ERSPAN_ENCAP_ISL = 0x1, /* originally ISL encapsulated */ |
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ERSPAN_ENCAP_8021Q = 0x2, /* originally 802.1Q encapsulated */ |
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ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ |
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}; |
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#define ERSPAN_V1_MDSIZE 4 |
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#define ERSPAN_V2_MDSIZE 8 |
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struct erspan_base_hdr { |
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#if defined(__LITTLE_ENDIAN_BITFIELD) |
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__u8 vlan_upper:4, |
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ver:4; |
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__u8 vlan:8; |
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__u8 session_id_upper:2, |
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t:1, |
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en:2, |
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cos:3; |
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__u8 session_id:8; |
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#elif defined(__BIG_ENDIAN_BITFIELD) |
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__u8 ver: 4, |
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vlan_upper:4; |
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__u8 vlan:8; |
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__u8 cos:3, |
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en:2, |
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t:1, |
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session_id_upper:2; |
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__u8 session_id:8; |
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#else |
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#error "Please fix <asm/byteorder.h>" |
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#endif |
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}; |
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static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id) |
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{ |
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ershdr->session_id = id & 0xff; |
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ershdr->session_id_upper = (id >> 8) & 0x3; |
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} |
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static inline u16 get_session_id(const struct erspan_base_hdr *ershdr) |
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{ |
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return (ershdr->session_id_upper << 8) + ershdr->session_id; |
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} |
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static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan) |
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{ |
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ershdr->vlan = vlan & 0xff; |
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ershdr->vlan_upper = (vlan >> 8) & 0xf; |
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} |
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static inline u16 get_vlan(const struct erspan_base_hdr *ershdr) |
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{ |
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return (ershdr->vlan_upper << 8) + ershdr->vlan; |
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} |
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static inline void set_hwid(struct erspan_md2 *md2, u8 hwid) |
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{ |
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md2->hwid = hwid & 0xf; |
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md2->hwid_upper = (hwid >> 4) & 0x3; |
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} |
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static inline u8 get_hwid(const struct erspan_md2 *md2) |
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{ |
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return (md2->hwid_upper << 4) + md2->hwid; |
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} |
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static inline int erspan_hdr_len(int version) |
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{ |
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if (version == 0) |
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return 0; |
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return sizeof(struct erspan_base_hdr) + |
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(version == 1 ? ERSPAN_V1_MDSIZE : ERSPAN_V2_MDSIZE); |
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} |
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static inline u8 tos_to_cos(u8 tos) |
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{ |
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u8 dscp, cos; |
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dscp = tos >> 2; |
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cos = dscp >> 3; |
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return cos; |
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} |
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static inline void erspan_build_header(struct sk_buff *skb, |
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u32 id, u32 index, |
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bool truncate, bool is_ipv4) |
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{ |
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struct ethhdr *eth = (struct ethhdr *)skb->data; |
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enum erspan_encap_type enc_type; |
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struct erspan_base_hdr *ershdr; |
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struct qtag_prefix { |
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__be16 eth_type; |
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__be16 tci; |
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} *qp; |
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u16 vlan_tci = 0; |
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u8 tos; |
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__be32 *idx; |
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tos = is_ipv4 ? ip_hdr(skb)->tos : |
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(ipv6_hdr(skb)->priority << 4) + |
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(ipv6_hdr(skb)->flow_lbl[0] >> 4); |
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enc_type = ERSPAN_ENCAP_NOVLAN; |
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/* If mirrored packet has vlan tag, extract tci and |
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* perserve vlan header in the mirrored frame. |
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*/ |
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if (eth->h_proto == htons(ETH_P_8021Q)) { |
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qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); |
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vlan_tci = ntohs(qp->tci); |
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enc_type = ERSPAN_ENCAP_INFRAME; |
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} |
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skb_push(skb, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); |
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ershdr = (struct erspan_base_hdr *)skb->data; |
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memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE); |
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/* Build base header */ |
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ershdr->ver = ERSPAN_VERSION; |
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ershdr->cos = tos_to_cos(tos); |
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ershdr->en = enc_type; |
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ershdr->t = truncate; |
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set_vlan(ershdr, vlan_tci); |
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set_session_id(ershdr, id); |
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/* Build metadata */ |
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idx = (__be32 *)(ershdr + 1); |
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*idx = htonl(index & INDEX_MASK); |
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} |
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/* ERSPAN GRA: timestamp granularity |
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* 00b --> granularity = 100 microseconds |
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* 01b --> granularity = 100 nanoseconds |
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* 10b --> granularity = IEEE 1588 |
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* Here we only support 100 microseconds. |
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*/ |
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static inline __be32 erspan_get_timestamp(void) |
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{ |
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u64 h_usecs; |
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ktime_t kt; |
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kt = ktime_get_real(); |
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h_usecs = ktime_divns(kt, 100 * NSEC_PER_USEC); |
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/* ERSPAN base header only has 32-bit, |
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* so it wraps around 4 days. |
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*/ |
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return htonl((u32)h_usecs); |
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} |
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/* ERSPAN BSO (Bad/Short/Oversized), see RFC1757 |
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* 00b --> Good frame with no error, or unknown integrity |
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* 01b --> Payload is a Short Frame |
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* 10b --> Payload is an Oversized Frame |
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* 11b --> Payload is a Bad Frame with CRC or Alignment Error |
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*/ |
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enum erspan_bso { |
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BSO_NOERROR = 0x0, |
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BSO_SHORT = 0x1, |
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BSO_OVERSIZED = 0x2, |
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BSO_BAD = 0x3, |
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}; |
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static inline u8 erspan_detect_bso(struct sk_buff *skb) |
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{ |
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/* BSO_BAD is not handled because the frame CRC |
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* or alignment error information is in FCS. |
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*/ |
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if (skb->len < ETH_ZLEN) |
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return BSO_SHORT; |
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if (skb->len > ETH_FRAME_LEN) |
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return BSO_OVERSIZED; |
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return BSO_NOERROR; |
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} |
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static inline void erspan_build_header_v2(struct sk_buff *skb, |
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u32 id, u8 direction, u16 hwid, |
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bool truncate, bool is_ipv4) |
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{ |
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struct ethhdr *eth = (struct ethhdr *)skb->data; |
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struct erspan_base_hdr *ershdr; |
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struct erspan_md2 *md2; |
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struct qtag_prefix { |
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__be16 eth_type; |
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__be16 tci; |
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} *qp; |
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u16 vlan_tci = 0; |
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u8 gra = 0; /* 100 usec */ |
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u8 bso = 0; /* Bad/Short/Oversized */ |
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u8 sgt = 0; |
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u8 tos; |
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tos = is_ipv4 ? ip_hdr(skb)->tos : |
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(ipv6_hdr(skb)->priority << 4) + |
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(ipv6_hdr(skb)->flow_lbl[0] >> 4); |
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/* Unlike v1, v2 does not have En field, |
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* so only extract vlan tci field. |
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*/ |
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if (eth->h_proto == htons(ETH_P_8021Q)) { |
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qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); |
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vlan_tci = ntohs(qp->tci); |
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} |
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bso = erspan_detect_bso(skb); |
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skb_push(skb, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); |
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ershdr = (struct erspan_base_hdr *)skb->data; |
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memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE); |
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/* Build base header */ |
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ershdr->ver = ERSPAN_VERSION2; |
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ershdr->cos = tos_to_cos(tos); |
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ershdr->en = bso; |
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ershdr->t = truncate; |
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set_vlan(ershdr, vlan_tci); |
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set_session_id(ershdr, id); |
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/* Build metadata */ |
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md2 = (struct erspan_md2 *)(ershdr + 1); |
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md2->timestamp = erspan_get_timestamp(); |
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md2->sgt = htons(sgt); |
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md2->p = 1; |
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md2->ft = 0; |
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md2->dir = direction; |
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md2->gra = gra; |
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md2->o = 0; |
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set_hwid(md2, hwid); |
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} |
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#endif
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