projects / mirror_ubuntu-eoan-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 84e54fe0 WT |
1 | #ifndef __LINUX_ERSPAN_H |
| 2 | #define __LINUX_ERSPAN_H | |
| 3 | ||
| 4 | /* | |
| 5 | * GRE header for ERSPAN encapsulation (8 octets [34:41]) -- 8 bytes | |
| 6 | * 0 1 2 3 | |
| 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 | |
| 8 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 9 | * |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN | | |
| 10 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 11 | * | Sequence Number (increments per packet per session) | | |
| 12 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 13 | * | |
| 14 | * Note that in the above GRE header [RFC1701] out of the C, R, K, S, | |
| 15 | * s, Recur, Flags, Version fields only S (bit 03) is set to 1. The | |
| 16 | * other fields are set to zero, so only a sequence number follows. | |
| 17 | * | |
| 18 | * ERSPAN Type II header (8 octets [42:49]) | |
| 19 | * 0 1 2 3 | |
| 20 | * 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 | |
| 21 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 22 | * | Ver | VLAN | COS | En|T| Session ID | | |
| 23 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 24 | * | Reserved | Index | | |
| 25 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 26 | * | |
| 27 | * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB | |
| 28 | */ | |
| 29 | ||
| 30 | #define ERSPAN_VERSION 0x1 | |
| 31 | ||
| 32 | #define VER_MASK 0xf000 | |
| 33 | #define VLAN_MASK 0x0fff | |
| 34 | #define COS_MASK 0xe000 | |
| 35 | #define EN_MASK 0x1800 | |
| 36 | #define T_MASK 0x0400 | |
| 37 | #define ID_MASK 0x03ff | |
| 38 | #define INDEX_MASK 0xfffff | |
| 39 | ||
| 40 | enum erspan_encap_type { | |
| 41 | ERSPAN_ENCAP_NOVLAN = 0x0, /* originally without VLAN tag */ | |
| 42 | ERSPAN_ENCAP_ISL = 0x1, /* originally ISL encapsulated */ | |
| 43 | ERSPAN_ENCAP_8021Q = 0x2, /* originally 802.1Q encapsulated */ | |
| 44 | ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ | |
| 45 | }; | |
| 46 | ||
| 47 | struct erspan_metadata { | |
| 48 | __be32 index; /* type II */ | |
| 49 | }; | |
| 50 | ||
| 51 | struct erspanhdr { | |
| 52 | __be16 ver_vlan; | |
| 53 | #define VER_OFFSET 12 | |
| 54 | __be16 session_id; | |
| 55 | #define COS_OFFSET 13 | |
| 56 | #define EN_OFFSET 11 | |
| 57 | #define T_OFFSET 10 | |
| 58 | struct erspan_metadata md; | |
| 59 | }; | |
| 60 | ||
| a3222dc9 WT |
61 | static inline u8 tos_to_cos(u8 tos) |
| 62 | { | |
| 63 | u8 dscp, cos; | |
| 64 | ||
| 65 | dscp = tos >> 2; | |
| 66 | cos = dscp >> 3; | |
| 67 | return cos; | |
| 68 | } | |
| 69 | ||
| 70 | static inline void erspan_build_header(struct sk_buff *skb, | |
| 71 | __be32 id, u32 index, | |
| 72 | bool truncate, bool is_ipv4) | |
| 73 | { | |
| 74 | struct ethhdr *eth = eth_hdr(skb); | |
| 75 | enum erspan_encap_type enc_type; | |
| 76 | struct erspanhdr *ershdr; | |
| 77 | struct qtag_prefix { | |
| 78 | __be16 eth_type; | |
| 79 | __be16 tci; | |
| 80 | } *qp; | |
| 81 | u16 vlan_tci = 0; | |
| 82 | u8 tos; | |
| 83 | ||
| 84 | tos = is_ipv4 ? ip_hdr(skb)->tos : | |
| 85 | (ipv6_hdr(skb)->priority << 4) + | |
| 86 | (ipv6_hdr(skb)->flow_lbl[0] >> 4); | |
| 87 | ||
| 88 | enc_type = ERSPAN_ENCAP_NOVLAN; | |
| 89 | ||
| 90 | /* If mirrored packet has vlan tag, extract tci and | |
| 91 | * perserve vlan header in the mirrored frame. | |
| 92 | */ | |
| 93 | if (eth->h_proto == htons(ETH_P_8021Q)) { | |
| 94 | qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); | |
| 95 | vlan_tci = ntohs(qp->tci); | |
| 96 | enc_type = ERSPAN_ENCAP_INFRAME; | |
| 97 | } | |
| 98 | ||
| 99 | skb_push(skb, sizeof(*ershdr)); | |
| 100 | ershdr = (struct erspanhdr *)skb->data; | |
| 101 | memset(ershdr, 0, sizeof(*ershdr)); | |
| 102 | ||
| 103 | ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) | | |
| 104 | (ERSPAN_VERSION << VER_OFFSET)); | |
| 105 | ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) | | |
| 106 | ((tos_to_cos(tos) << COS_OFFSET) & COS_MASK) | | |
| 107 | (enc_type << EN_OFFSET & EN_MASK) | | |
| 108 | ((truncate << T_OFFSET) & T_MASK)); | |
| 109 | ershdr->md.index = htonl(index & INDEX_MASK); | |
| 110 | } | |
| 111 | ||
| 84e54fe0 | 112 | #endif |