From patchwork Thu May 30 23:27:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 13680946 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-ed1-f54.google.com (mail-ed1-f54.google.com [209.85.208.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8DAFA4D8C3; Thu, 30 May 2024 23:27:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717111665; cv=none; b=H031IuF5sdsDAT2ezHXVGGX0gbOiUhYgNCP6FtjECk0R8SHNCQzwLuXz9oeSv3EekNArS+9a0YuJKhi0CJsfeV9f3DmwfhXQpM3BqflJF8XWw70WdyIJVqnycB63+deMRbZE0XDmYdrYPyE7hdWXnjOuWmtSkQNxwR8E+nATZXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717111665; c=relaxed/simple; bh=x/k6Kpvd3d3Dt3fnD5caMY+otK5hlu1tQbKkTc66ihU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DLaqFRTt5o2Z9V7OBUZJXcBs7oeUvyImPu7BB9ZtkpoX3n43SQmWkn7KIIHa80OzycABLI2oLyPtgQE75LHNXa/A0bCTebDI6JDLrLqyTV4HOMviL6drJwLvVG5aRmOLELlPi73eAg8uMwRY627moP1Y4AtbX/WNRT382UJ6pcw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=D2kjQBsP; arc=none smtp.client-ip=209.85.208.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="D2kjQBsP" Received: by mail-ed1-f54.google.com with SMTP id 4fb4d7f45d1cf-57864327f6eso2254573a12.1; Thu, 30 May 2024 16:27:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1717111662; x=1717716462; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=WSLJvHjzEW7OFvjVKUT8WVkEESYqHYJbjaoB4OVbctY=; b=D2kjQBsP6WCvcJ9FRhJsipvShiNiLPxCKbi3p1zZooqtdt1aisVHJT+vD4VZMR0U8/ Wj8r0I9yGMbt+XOdBMLsf0cxTKrm6JcJochiUuZ2KhIkcNhP0uLTF3f7cga7Ikuxd7+u BWxxgKphbKED5kDqfil555mETgfPahrLQ7WoQJMRVTH6G6J+5o2pVc2vVbr07eXYvUZN 7dgSf0D+0bm9Volpd6JBboAoaIeEVlbIh80lUrHjpkNpFRQFgeLOhfTDxKhFcxTAGtkI /n6vSu733LTPOOe3+cSmYUsBROswBplf6EhHqZrUePkWJ0H1D9gaN77jDkybFdanRA9G b5RA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717111662; x=1717716462; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=WSLJvHjzEW7OFvjVKUT8WVkEESYqHYJbjaoB4OVbctY=; b=lmMOhL8o2Wa/C2XpxkKFgLspB/C6Ezc4b+w/lKBXFLAbDdyDXPKJ9r2YxLrv1V6xb5 3SJA1nKFvafgY43H5xRniE4SQctX6WJzfs9gRGZ7gugD+77AU+mRMGiEN/XJQip+eefR d/N89aHd9YbSqjGSCabABdAi44r8xufICw1aP4WX+sEWPfzDWS6EUQ5QrQ7J5AIrJALo +Z0b3mjLDaD8Z5v715bTfmTxWpHTpN3mFXVf3AVyOnmCIhqr97wjt3dLpuMuTeMA6yWr FkEgz5fzlvHCaXQeGIUX9C8rc16xVhgzjs34tNxDz69rr7GRDmLPIhHa/3zfFisQSg05 JOBw== X-Forwarded-Encrypted: i=1; AJvYcCVCsHc8AYyN8mzFeIP75Gr7G2r/tV9rxR7z/l9knY5svpXC8fqau+kC95bw6nipGrv1yDxilh4T6xBTJriSoomGYVT/GvJxZmvk51yyj0ssPcyNPnuatAF/G0frKqhv9gdKBcUSG/713DU7YRde X-Gm-Message-State: AOJu0Yw2sfNxeh1+Q+IoZNuQzTEri/9TXsjsEUUAsa9FUpnAx5h+cY3j dBI24gBJqQFhgftjC+7g3Dz/xSjpq1cNVjez9Y1LI/5x0enMShGIdvV9SA== X-Google-Smtp-Source: AGHT+IEBAW0TjmtzG+Sjm6uDWd/Li+E2qd5PmPGUZOyyTg49iDQUIvHu+qPLEL14CBstls6nq7rWYg== X-Received: by 2002:a50:9f61:0:b0:574:ebf4:f786 with SMTP id 4fb4d7f45d1cf-57a3644d2b3mr288091a12.16.1717111661820; Thu, 30 May 2024 16:27:41 -0700 (PDT) Received: from lenovo.. (mob-2-43-182-132.net.vodafone.it. [2.43.182.132]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-57a35e86c36sm197223a12.54.2024.05.30.16.27.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 16:27:41 -0700 (PDT) From: technoboy85@gmail.com To: netdev@vger.kernel.org Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Shakeel Butt , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Matteo Croce Subject: [PATCH net-next v2 1/2] net: make net.core.{r,w}mem_{default,max} namespaced Date: Fri, 31 May 2024 01:27:21 +0200 Message-ID: <20240530232722.45255-2-technoboy85@gmail.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240530232722.45255-1-technoboy85@gmail.com> References: <20240530232722.45255-1-technoboy85@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Matteo Croce The following sysctl are global and can't be read from a netns: net.core.rmem_default net.core.rmem_max net.core.wmem_default net.core.wmem_max Make the following sysctl parameters available readonly from within a network namespace, allowing a container to read them. Signed-off-by: Matteo Croce Reviewed-by: Eric Dumazet Reviewed-by: Shakeel Butt --- net/core/sysctl_net_core.c | 75 +++++++++++++++++++++----------------- 1 file changed, 42 insertions(+), 33 deletions(-) diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index c9fb9ad87485..2079000691e2 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -382,38 +382,6 @@ proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write, #endif static struct ctl_table net_core_table[] = { - { - .procname = "wmem_max", - .data = &sysctl_wmem_max, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_sndbuf, - }, - { - .procname = "rmem_max", - .data = &sysctl_rmem_max, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_rcvbuf, - }, - { - .procname = "wmem_default", - .data = &sysctl_wmem_default, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_sndbuf, - }, - { - .procname = "rmem_default", - .data = &sysctl_rmem_default, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec_minmax, - .extra1 = &min_rcvbuf, - }, { .procname = "mem_pcpu_rsv", .data = &net_hotdata.sysctl_mem_pcpu_rsv, @@ -697,6 +665,41 @@ static struct ctl_table netns_core_table[] = { .extra2 = SYSCTL_ONE, .proc_handler = proc_dou8vec_minmax, }, + /* sysctl_core_net_init() will set the values after this + * to readonly in network namespaces + */ + { + .procname = "wmem_max", + .data = &sysctl_wmem_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_sndbuf, + }, + { + .procname = "rmem_max", + .data = &sysctl_rmem_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_rcvbuf, + }, + { + .procname = "wmem_default", + .data = &sysctl_wmem_default, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_sndbuf, + }, + { + .procname = "rmem_default", + .data = &sysctl_rmem_default, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_rcvbuf, + }, }; static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str) @@ -724,8 +727,14 @@ static __net_init int sysctl_core_net_init(struct net *net) if (tbl == NULL) goto err_dup; - for (i = 0; i < table_size; ++i) + for (i = 0; i < table_size; ++i) { + if (tbl[i].data == &sysctl_wmem_max) + break; + tbl[i].data += (char *)net - (char *)&init_net; + } + for (; i < table_size; ++i) + tbl[i].mode &= ~0222; } net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl, table_size);