diff options
Diffstat (limited to 'include/net/erspan.h')
| -rw-r--r-- | include/net/erspan.h | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/include/net/erspan.h b/include/net/erspan.h index 6e758d08c9ee..70c40c7c75b2 100644 --- a/include/net/erspan.h +++ b/include/net/erspan.h @@ -15,7 +15,7 @@ * 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 Type II header (8 octets [42:49]) + * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -27,7 +27,7 @@ * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB */ -#define ERSPAN_VERSION 0x1 +#define ERSPAN_VERSION 0x1 /* ERSPAN type II */ #define VER_MASK 0xf000 #define VLAN_MASK 0x0fff @@ -44,20 +44,29 @@ enum erspan_encap_type { ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ }; +#define ERSPAN_V1_MDSIZE 4 +#define ERSPAN_V2_MDSIZE 8 struct erspan_metadata { - __be32 index; /* type II */ + union { + __be32 index; /* Version 1 (type II)*/ + } u; }; -struct erspanhdr { +struct erspan_base_hdr { __be16 ver_vlan; #define VER_OFFSET 12 __be16 session_id; #define COS_OFFSET 13 #define EN_OFFSET 11 #define T_OFFSET 10 - struct erspan_metadata md; }; +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; @@ -73,7 +82,8 @@ static inline void erspan_build_header(struct sk_buff *skb, { struct ethhdr *eth = eth_hdr(skb); enum erspan_encap_type enc_type; - struct erspanhdr *ershdr; + struct erspan_base_hdr *ershdr; + struct erspan_metadata *ersmd; struct qtag_prefix { __be16 eth_type; __be16 tci; @@ -96,17 +106,21 @@ static inline void erspan_build_header(struct sk_buff *skb, enc_type = ERSPAN_ENCAP_INFRAME; } - skb_push(skb, sizeof(*ershdr)); - ershdr = (struct erspanhdr *)skb->data; - memset(ershdr, 0, sizeof(*ershdr)); + 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_vlan = htons((vlan_tci & VLAN_MASK) | (ERSPAN_VERSION << VER_OFFSET)); ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) | ((tos_to_cos(tos) << COS_OFFSET) & COS_MASK) | (enc_type << EN_OFFSET & EN_MASK) | ((truncate << T_OFFSET) & T_MASK)); - ershdr->md.index = htonl(index & INDEX_MASK); + + /* Build metadata */ + ersmd = (struct erspan_metadata *)(ershdr + 1); + ersmd->u.index = htonl(index & INDEX_MASK); } #endif |