From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B861326159B; Tue, 8 Apr 2025 08:43:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744101796; cv=none; b=NWmIGNjd8K6itpVjl4AvO7sIoGl7fsh78dU6jdOFVwQQZiL+tvgiLKUz9R8nqCoZveG+qdhuFJEoAwnpCBbN/P6UlyVEP3GjPajNtxMYPguqkIerFI9fd08w9YSExVo5h6cstHPkhNSmY1eaJcmUd7TY4SnISP5H8QTh4V/1kRI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744101796; c=relaxed/simple; bh=QTCjrxQ/e5rfDTMmD+U3jR19pQGVrX4IP/gtSGx0nDY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=TMrECA51/BmAocUw7iAUF7Io9R942h/64cyQJgww9L9clpS9SXc77rwfabFjxOvy6qRXeVIZfpPjfKMz/U+Lps2OtA9sx2na1Yeb7GUWIM1HiXIcp4/UNgwUb+lis1ZrZV0ET6R07QkL4T+4H/SSahlo32y0Ypu2Vhu33B/YvKo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=Rk5vQxf1; arc=none smtp.client-ip=220.197.31.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="Rk5vQxf1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=QTCjr xQ/e5rfDTMmD+U3jR19pQGVrX4IP/gtSGx0nDY=; b=Rk5vQxf1dDZh6DHjYtXHf iLtwJ0LiRu5o2kqSfDBuShs5nnDJ4wSOcpSY7GIhTwsi17ryX5GoQ0xLK9LzMST5 dEHUHp6uAJDidE2vZRaCwdueFZB0fLLDD5tjkbjHevtt8O0PRTB6XbRfd0VbPmLK 2trqy3IK3oJTY9YGPEZfYo= Received: from localhost.localdomain (unknown []) by gzga-smtp-mtada-g1-2 (Coremail) with SMTP id _____wCHlTrc3fRnuKo+FA--.30056S4; Tue, 08 Apr 2025 16:27:11 +0800 (CST) From: lvxiafei To: ej@inai.de Cc: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.org, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, lvxiafei@sensetime.com, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, xiafei_xupt@163.com Subject: Re: [PATCH] netfilter: netns nf_conntrack: per-netns net.netfilter.nf_conntrack_max sysctl Date: Tue, 8 Apr 2025 16:27:08 +0800 Message-Id: <20250408082708.56208-1-xiafei_xupt@163.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <66ror6q2-7pq2-os23-rq8r-8426ppr6pnps@vanv.qr> References: <66ror6q2-7pq2-os23-rq8r-8426ppr6pnps@vanv.qr> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wCHlTrc3fRnuKo+FA--.30056S4 X-Coremail-Antispam: 1Uf129KBjvdXoW7Gr4DGw1kAr13Jr47uw47XFb_yoWfCrb_ZF ZrXFnFkw1jvrs7Jry5ta1xZa93KFW8Ar1UA3yrtwsIkr1fXw15GFn2grW3ZF4UGr4ruF15 u3WSgw4kurWfujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7VUU9NVDUUUUU== X-CM-SenderInfo: x0ldwvplb031rw6rljoofrz/1tbiKBMpU2f03Noc4AAAso On Mon, 7 Apr 2025 12:56:33 Jan Engelhardt wrote: > By inheriting an implicit limit from the parent namespace somehow. > For example, even if you set the kernel.pid_max sysctl in the initial > namespace to something like 9999, subordinate namespace have > kernel.pid_max=4million again, but nevertheless are unable to use > more than 9999 PIDs. Or so documentation the documentation > from commit d385c8bceb14665e935419334aa3d3fac2f10456 tells me > (I did not try to create so many processes by myself). > > A similar logic would have to be applied for netfilter sysctls > if they are made modifiable in subordinate namespaces. The patch is to use nf_conntrack_max to more flexibly limit the ct_count in different netns, which may be greater than the parent namespace, belonging to the global (ancestral) limit, and there is no implicit limit inherited from the parent namespace