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