安全: nftables基础知识系列之二:查看规则/删除规则

一，查看规则

查看所有规则

[root@192 ~]# nft list ruleset
table inet my_table {
        chain my_chain {
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept
                tcp dport 80 accept
                tcp dport 3306 accept
                tcp dport 123 accept
        }
}

查看指定表内的规则

[root@192 ~]# nft list table inet my_table
table inet my_table {
        chain my_chain {
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept
                tcp dport 80 accept
                tcp dport 3306 accept
                tcp dport 123 accept
        }
}

查看指定链内的规则

[root@192 ~]# nft list chain inet my_table my_chain
table inet my_table {
        chain my_chain {
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept
                tcp dport 80 accept
                tcp dport 3306 accept
                tcp dport 123 accept
        }
}

二，删除规则

1,查看得到规则的句柄:

[root@192 ~]# nft --handle list chain inet my_table my_chain
table inet my_table {
        chain my_chain { # handle 9
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept # handle 10
                tcp dport 80 accept # handle 11
                tcp dport 3306 accept # handle 12
                tcp dport 123 accept # handle 13
        }
}

-a参数也可以看到规则的句柄

[root@192 ~]# nft -a list chain inet my_table my_chain
table inet my_table {
        chain my_chain { # handle 9
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept # handle 10
                tcp dport 80 accept # handle 11
                tcp dport 3306 accept # handle 12
                tcp dport 123 accept # handle 13
        }
}

删除 ：

[root@192 ~]# nft delete rule inet my_table my_chain handle 11

查看效果:

[root@192 ~]# nft -a list chain inet my_table my_chain
table inet my_table {
        chain my_chain { # handle 9
                type filter hook input priority filter; policy accept;
                tcp dport 22 accept # handle 10
                tcp dport 3306 accept # handle 12
                tcp dport 123 accept # handle 13
        }
}

2,清除所有规则:

[root@192 ~]# nft flush ruleset

查看效果:

[root@192 ~]# nft list ruleset