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nftables：ct 状态规则产生“错误：无法处理规则：没有这样的文件或目录”

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nftables：ct 状态规则产生“错误：无法处理规则：没有这样的文件或目录”

这是我的 /etc/nftables.conf

#!/usr/sbin/nft -f
flush ruleset

define wan = { eth0 }


table inet filter {
    chain input {
        type filter hook input priority 0; policy drop;

            # allow everything from loopback interface
            iif lo accept comment "Accept any localhost traffic"
            # drop invalid connection attempts
            ct state invalid drop comment "Drop all invalid connection attempts"
            # allow established and related connections
            ct state established,related accept comment "Accept all traffic initiated by us"
            # allow explicitly allowed services/ports/protocols
            iif $wan tcp dport 22 accept comment "wan"
            # Apply extra (manual configured) rules
            # reject everything that has  not been accepted before
            reject with icmpx type admin-prohibited comment "Drop everything, which is not explicitly allowed"
    }
    chain forward {
        type filter hook forward priority 0; policy drop;

            # allow everything from loopback interface
            iif lo accept comment "Accept any localhost traffic"
            # drop invalid connection attempts
            ct state invalid drop comment "Drop all invalid connection attempts"
            # Apply extra (manual configured) rules
            # reject everything that has  not been accepted before
            reject with icmpx type admin-prohibited comment "Drop everything, which is not explicitly allowed"
    }
    chain output {
        type filter hook output priority 0; policy accept;

            # Apply extra (manual configured) rules
            }
}

journalctl -u nftables.service这是我运行后得到的结果systemctl restart nftables.service：

Feb 01 18:54:40 mydomain.net systemd[1]: Starting nftables...
Feb 01 18:54:40 mydomain.net nft[1682]: /etc/nftables.conf:14:13-33: Error: Could not process rule: No such file or directory
Feb 01 18:54:40 mydomain.net nft[1682]:             ct state invalid drop comment "Drop all invalid connection attempts"
Feb 01 18:54:40 mydomain.net nft[1682]:             ^^^^^^^^^^^^^^^^^^^^^
Feb 01 18:54:40 mydomain.net nft[1682]: /etc/nftables.conf:16:13-47: Error: Could not process rule: No such file or directory
Feb 01 18:54:40 mydomain.net nft[1682]:             ct state established,related accept comment "Accept all traffic initiated by us"
Feb 01 18:54:40 mydomain.net nft[1682]:             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Feb 01 18:54:40 mydomain.net nft[1682]: /etc/nftables.conf:21:13-51: Error: Could not process rule: No such file or directory
Feb 01 18:54:40 mydomain.net nft[1682]:             reject with icmpx type admin-prohibited comment "Drop everything, which is not explicitly allowed"
Feb 01 18:54:40 mydomain.net nft[1682]:             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Feb 01 18:54:40 mydomain.net nft[1682]: /etc/nftables.conf:29:13-33: Error: Could not process rule: No such file or directory
Feb 01 18:54:40 mydomain.net nft[1682]:             ct state invalid drop comment "Drop all invalid connection attempts"
Feb 01 18:54:40 mydomain.net nft[1682]:             ^^^^^^^^^^^^^^^^^^^^^
Feb 01 18:54:40 mydomain.net nft[1682]: /etc/nftables.conf:32:13-51: Error: Could not process rule: No such file or directory
Feb 01 18:54:40 mydomain.net nft[1682]:             reject with icmpx type admin-prohibited comment "Drop everything, which is not explicitly allowed"
Feb 01 18:54:40 mydomain.net nft[1682]:             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Feb 01 18:54:40 mydomain.net systemd[1]: nftables.service: Main process exited, code=exited, status=1/FAILURE
Feb 01 18:54:40 mydomain.net systemd[1]: nftables.service: Failed with result 'exit-code'.
Feb 01 18:54:40 mydomain.net systemd[1]: Failed to start nftables.

当我注释以“ct state”开头的规则时，服务启动时没有错误。这里出了什么问题？同样的规则集在其他机器上运行良好。

系统信息：

操作系统：Debian 10

内核：4.19.0-14-amd64

答案1

对于遇到此问题的其他人。确保：

  1. “netfilter”（和相应的）内核选项直接编译或作为模块编译（grep -i netfilter /proc/config* 或 grep -i netfilter /boot/config*）
  2. 如果该选项已编译为模块，请确保没有将 sysctl 选项 kernel.modules_disabled 设置为 1。（编辑 /etc/sysctl.conf）

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