#!/usr/sbin/nft -f

flush ruleset

define RESERVED_IP = {
    100.64.0.0/10,
    127.0.0.0/8,
    169.254.0.0/16,
    172.16.0.0/12,
    192.0.0.0/24,
    224.0.0.0/4,
    240.0.0.0/4,
    255.255.255.255/32
}

define RESERVED_IP6 = {
    ::1/128,
    ::/128,
    fe80::/10,
    ff00::/8,
    fc00::/7,
    2001:db8::/32,
    fec0::/10
}

define LOCAL_NET = { 10.10.10.0/24 }
define LOCAL_NET6 = { fddd:dddd::/64 }

table ip mihomo {
    chain prerouting {
        type filter hook prerouting priority mangle; policy accept;
        ip daddr $RESERVED_IP return
        ip daddr $LOCAL_NET return
        udp dport { 123 } return
        meta mark 1234 return
        ip protocol tcp tproxy to :7895 meta mark set 1
        ip protocol udp tproxy to :7895 meta mark set 1
    }

    chain output {
        type route hook output priority mangle; policy accept;
        ip daddr $RESERVED_IP return
        ip daddr $LOCAL_NET return
        udp dport { 123 } return
        meta mark 1234 return
        ip protocol tcp meta mark set 1
        ip protocol udp meta mark set 1
    }
}

table ip6 mihomo {
    chain prerouting {
        type filter hook prerouting priority mangle; policy accept;
        ip6 daddr $RESERVED_IP6 return
        ip6 daddr $LOCAL_NET6 return
        meta mark 1234 return
        ip6 nexthdr tcp tproxy to :7895 meta mark set 1
        ip6 nexthdr udp tproxy to :7895 meta mark set 1
    }

    chain output {
        type route hook output priority mangle; policy accept;
        ip6 daddr $RESERVED_IP6 return
        ip6 daddr $LOCAL_NET6 return
        meta mark 1234 return
        ip6 nexthdr tcp meta mark set 1
        ip6 nexthdr udp meta mark set 1
    }

    chain forward {
        type filter hook forward priority mangle; policy accept;
        #IPv6 TCP MSS 修正规则（适配 MTU=1280，MSS=1220）
        tcp flags syn tcp option maxseg size set 1280
    }
}