|
Data Fields | |
__u8 | nexthdr |
__u8 | len |
__u16 | reserved |
__u32 | spi |
__u32 | sequence |
__u8 | ah_data [IPSEC_AUTH_ICV] |
|
ICV (Integrity Check Value), variable-length data. 12 bytes (96 bits) for HMAC-SHA1-96 and HMAC-MD5-96 |
|
type of service |
|
type of next payload (protocol nr) |
|
MUST be 0x0000 (reserved for future use) |
|
sequence number (increasing strictly), used by anti-replay feature |
|
Security Parameter Index (0, 1..255 are special cases RFC2402, p.4) |