sudo nft add element ip table-test table-set '{ 127.0.1.3 }'
sudo nft add table ip table-test
sudo nft add set ip table-test table-set '{ type ipv4_addr; comment "drop all packets from these hosts"; }'
sudo nft list set ip table-test table-set
sudo nft flush set ip table-test table-set


14619 sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, 
msg_iov=[{iov_base=[[{nlmsg_len=20, nlmsg_type=NFNL_MSG_BATCH_BEGIN, nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}, 
{nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(10)}], 
[
    {
        nlmsg_len=72, 
        nlmsg_type=NFNL_SUBSYS_NFTABLES<<8|NFT_MSG_NEWSETELEM, 
        nlmsg_flags=NLM_F_REQUEST|NLM_F_CREATE, 
        nlmsg_seq=1, 
        nlmsg_pid=0
    }, 
    {
        nfgen_family=AF_INET, 
        version=NFNETLINK_V0, 
        res_id=htons(0)
    }, 
    [
        [
            {nla_len=11, nla_type=0x1}, 
            "\x66\x69\x6c\x74\x65\x72\x00"
        ], 
        [
            {nla_len=9, nla_type=0x2}, 
            "\x74\x65\x73\x74\x00"
        ], 
        [
            {nla_len=8, nla_type=0x4}, 
            "\x00\x00\x00\x01"
        ], 
        [
            {nla_len=20, nla_type=NLA_F_NESTED|0x3}, 
            "\x10\x00\x01\x80\x0c\x00\x01\x80\x08\x00\x01\x00\x7f\x00\x01\x04"]
        ]
    ], 
    [
        {nlmsg_len=20, nlmsg_type=NFNL_MSG_BATCH_END, nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=2, nlmsg_pid=0}, {nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(10)}]], iov_len=112}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 112

nlmsghdr:
14 00 00 00  nlmsg_len 20
10 00 nlmsg_type NLMSG_MIN_TYPE 10
01 00  nlmsg_flags NLM_F_REQUEST 1
BC 55 AF 0D  nlmsg_seq random
00 00 00 00 nlmsg_pid 0

nfgenmsg:
00 
00 
00 0A 

nlmsghdr:
28 00 00 00
0C 0A 
05 06 
BD 55 AF 0D 
00 00 00 00 

nfgenmsg:
02 
00 
00 00 

nlattr
14 00 = 20
03 80 
10 00 00 80 0C 00 01 80 08 00 01 00 7F 00 01 01 14 00 00 00 

11 00 
01 00 
BE 55 AF 0D 00 00 00 00 00 00 00 0A 
 --- EOF

struct nfgenmsg {
	__u8  nfgen_family;		/* AF_xxx */
	__u8  version;		/* nfnetlink version */
	__be16    res_id;		/* resource id */
};


26857 sendmsg(3, 
{
    msg_name=
        {
            sa_family=AF_NETLINK, 
            nl_pid=0, 
            nl_groups=00000000
        }, 
        msg_namelen=12, 
        msg_iov=
        [
            {
                iov_base=
                [
                    [
                        {
                            nlmsg_len=20, 
                            nlmsg_type=NFNL_MSG_BATCH_BEGIN, 
                            nlmsg_flags=NLM_F_REQUEST, 
                            nlmsg_seq=0, 
                            nlmsg_pid=0
                        }, 
                        {
                            nfgen_family=AF_UNSPEC, 
                            version=NFNETLINK_V0, 
                            res_id=htons(10)
                        }
                    ], 
                    [
                        {
                            nlmsg_len=52, 
                            nlmsg_type=NFNL_SUBSYS_NFTABLES<<8|NFT_MSG_DELSETELEM, 
                            nlmsg_flags=NLM_F_REQUEST, 
                            nlmsg_seq=1, 
                            nlmsg_pid=0
                        }, 
                        {
                            nfgen_family=AF_INET, 
                            version=NFNETLINK_V0, 
                            res_id=htons(0)
                        }, 
                        [
                            [
                                {
                                    nla_len=14, 
                                    nla_type=0x2
                                }, 
                                "\x74\x61\x62\x6c\x65\x2d\x73\x65\x74\x00"
                            ], 
                            [
                                {
                                    nla_len=15, 
                                    nla_type=0x1
                                }, 
                                "\x74\x61\x62\x6c\x65\x2d\x74\x65\x73\x74\x00"
                            ]
                        ]
                    ], 
                    [
                        {
                            nlmsg_len=20, 
                            nlmsg_type=NFNL_MSG_BATCH_END, 
                            nlmsg_flags=NLM_F_REQUEST, 
                            nlmsg_seq=2, 
                            nlmsg_pid=0
                        }, 
                        {
                            nfgen_family=AF_UNSPEC, 
                            version=NFNETLINK_V0, 
                            res_id=htons(10)
                        }
                    ]
                ], 
                iov_len=92
            }
        ], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 92


27211 sendto(3, 
    [
        [
            {
                nlmsg_len=20, 
                nlmsg_type=NFNL_MSG_BATCH_BEGIN, 
                nlmsg_flags=NLM_F_REQUEST, 
                nlmsg_seq=813161474, 
                nlmsg_pid=0
            }, 
            {
                nfgen_family=AF_UNSPEC, 
                version=NFNETLINK_V0, 
                res_id=htons(10)
            }
        ], 
        [
            {
                nlmsg_len=52, 
                nlmsg_type=NFNL_SUBSYS_NFTABLES<<8|NFT_MSG_DELSETELEM, 
                nlmsg_flags=NLM_F_REQUEST, 
                nlmsg_seq=813161475, 
                nlmsg_pid=0
            }, 
            {
                nfgen_family=AF_INET, 
                version=NFNETLINK_V0, 
                res_id=htons(0)
            }, 
            [
                [
                    {
                        nla_len=9, 
                        nla_type=0x2
                    }, 
                    "\x61\x62\x63\x64\x00"
                ], 
                [
                    {
                        nla_len=8, 
                        nla_type=0x4
                    }, 
                    "\x00\x00\x00\x01"
                ], 
                [
                    {
                        nla_len=9, 
                        nla_type=0x1
                    }, 
                    "\x74\x65\x73\x74\x00"
                ]
            ]
        ], 
        [
            {
                nlmsg_len=20, 
                nlmsg_type=NFNL_MSG_BATCH_END, 
                nlmsg_flags=NLM_F_REQUEST, 
                nlmsg_seq=813161476, 
                nlmsg_pid=0
            }, 
            {
                nfgen_family=AF_UNSPEC, 
                version=NFNETLINK_V0, 
                res_id=htons(10)
            }
        ]
    ],
    92, 
    0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 92