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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Dexuan Cui <decui@microsoft.com>
Cc: "'netfilter-devel@vger.kernel.org'"
	<netfilter-devel@vger.kernel.org>,
	"'netdev@vger.kernel.org'" <netdev@vger.kernel.org>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: netfilter: iptables-restore: setsockopt(3, SOL_IP, IPT_SO_SET_REPLACE, "security...", ...) return -EAGAIN
Date: Thu, 13 May 2021 11:40:47 +0200	[thread overview]
Message-ID: <20210513094047.GA24842@salvia> (raw)
In-Reply-To: <MW2PR2101MB089257F49E8FAA00CDA63A61BF519@MW2PR2101MB0892.namprd21.prod.outlook.com>

On Thu, May 13, 2021 at 06:19:38AM +0000, Dexuan Cui wrote:
> > From: Dexuan Cui
> > Sent: Wednesday, May 12, 2021 11:02 PM
> 
> BTW, I found a similar report in 2019:
> 
> "
> https://serverfault.com/questions/101022/error-applying-iptables-rules-using-iptables-restore
> I stumbled upon this issue on Ubuntu 18.04. The netfilter-persistent
> service failed randomly on boot while working ok when launched manually.
> Turned out it was conflicting with sshguard service due to systemd trying
> to load everything in parallel. What helped is to setting
> ENABLE_FIREWALL=0 in /etc/default/sshguard and then adding sshguard chain
> and rule manually to /etc/iptables/rules.v4 and /etc/iptables/rules.v6.
> "
> 
> The above report provided a workaround.

There's -w and -W to serialize ruleset updates. You could follow a
similar approach from userspace if you don't use iptables userspace
binary.

> I think we need a real fix.

iptables-nft already fixes this.

  reply	other threads:[~2021-05-13  9:40 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12 22:17 netfilter: iptables-restore: setsockopt(3, SOL_IP, IPT_SO_SET_REPLACE, "security...", ...) return -EAGAIN Dexuan Cui
2021-05-13  4:19 ` Dexuan Cui
2021-05-13  6:02   ` Dexuan Cui
2021-05-13  6:19     ` Dexuan Cui
2021-05-13  9:40       ` Pablo Neira Ayuso [this message]
2021-05-13 17:08         ` Phil Sutter
2021-05-13 20:40           ` Dexuan Cui

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