meta-google/recipes-google/ncsi/files/50-gbmc-ncsi.rules.in

table inet filter {
    chain ncsi_input {
        type filter hook input priority 0; policy drop;
        iifname != @NCSI_IF@ accept
        ct state established accept
        ip6 daddr ff00::/8 goto ncsi_brd_input
        ip6 daddr fe80::/64 goto ncsi_legacy_input
    }
    chain ncsi_gbmc_br_pub_input {
        jump gbmc_br_pub_input
        reject
    }
    chain gbmc_br_pub_input {
    }
    chain ncsi_legacy_input {
        jump ncsi_brd_input
        tcp dport 3959 accept
        udp dport 3959 accept
        tcp dport 3967 accept
        udp dport 3967 accept
    }
    chain ncsi_brd_input {
        icmpv6 type nd-neighbor-advert accept
        icmpv6 type nd-neighbor-solicit accept
        icmpv6 type nd-router-advert accept
    }
    chain ncsi_forward {
        type filter hook forward priority 0; policy drop;
        iifname != @NCSI_IF@ accept
        oifname != gbmcbr drop
        ip6 daddr fdb5:0481:10ce::/64 drop
        ip6 saddr fdb5:0481:10ce::/64 drop
    }
}