50-dht4all fixes

# this custom script runs desync to DHT packets with udp payload length 101..399 , without ipset/hostlist filtering

# this custom script runs desync to DHT packets with udp payload length >=5 , without ipset/hostlist filtering

# NOTE: @ih requires nft 1.0.1+ and updated kernel version. it's confirmed to work on 5.15 (openwrt 23) and not work on 5.10 (openwrt 22)

# can override in config :

	local f uf4 uf6

	local first_packet_only="$ipt_connbytes 1:1"

	f='-p udp -m length --length 109:407 -m u32 --u32'

	uf4='0>>22&0x3C@8>>16=0x6431'

	uf6='48>>16=0x6431'

	f='-p udp -m u32 --u32'

	uf4='0>>22&0x3C@4>>16=13:0xFFFF&&0>>22&0x3C@8>>16=0x6431:0x6432'

	uf6='44>>16=13:0xFFFF&&48>>16=0x6431:0x6432'

	fw_nfqws_post $1 "$f $uf4 $first_packet_only"  "$f $uf6 $first_packet_only" $QNUM_DHT4ALL

}

zapret_custom_firewall_nft()

        local f

        local first_packet_only="$nft_connbytes 1"

        f="meta length 109-407 meta l4proto udp @ih,0,16 0x6431"

        f="udp length ge 13 meta l4proto udp @ih,0,16 0x6431-0x6432"

        nft_fw_nfqws_post "$f $first_packet_only" "$f $first_packet_only" $QNUM_DHT4ALL

}