ip6tables-translate -A INPUT -m ah --ahspi 500 -j DROP
nft 'add rule ip6 filter INPUT ah spi 500 counter drop'

ip6tables-translate -A INPUT -m ah --ahspi 500:550 -j DROP
nft 'add rule ip6 filter INPUT ah spi 500-550 counter drop'

ip6tables-translate -A INPUT -m ah ! --ahlen 120
nft 'add rule ip6 filter INPUT ah hdrlength != 120 counter'

ip6tables-translate -A INPUT -m ah --ahres
nft 'add rule ip6 filter INPUT ah reserved 1 counter'

ip6tables-translate -A INPUT -m ah --ahspi 500 ! --ahlen 120 -j DROP
nft 'add rule ip6 filter INPUT ah spi 500 ah hdrlength != 120 counter drop'

ip6tables-translate -A INPUT -m ah --ahspi 500 --ahlen 120 --ahres -j ACCEPT
nft 'add rule ip6 filter INPUT ah spi 500 ah hdrlength 120 ah reserved 1 counter accept'