From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FE87C433E1 for ; Mon, 10 Aug 2020 14:56:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4CD9E20791 for ; Mon, 10 Aug 2020 14:56:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TcjsJ2Mn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727120AbgHJO4M (ORCPT ); Mon, 10 Aug 2020 10:56:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726482AbgHJO4L (ORCPT ); Mon, 10 Aug 2020 10:56:11 -0400 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB4E2C061756; Mon, 10 Aug 2020 07:56:11 -0700 (PDT) Received: by mail-pl1-x642.google.com with SMTP id k13so4990704plk.13; Mon, 10 Aug 2020 07:56:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=ewxZsA2sOKsYvtVwAS6LdLqeVgx5AXOVS7mYEisKyOo=; b=TcjsJ2MnNMsEBg3Tm7czoe3hzZLz8q9xyHzKW1xxJOG/99Gje2jsohx2Eos6AFSsfj MkKEgG9f1yciUHnN2cs3WkibpmTTRGdR1qL8RQTytz1CdkycyBAUwlobys0gkeKu7RgJ UD3ywrx1HmYJKAwUhXyIfHb34s8li2nqXGMIfy4mC2XLoaoUImo1RoH1IbqqYlFKRW4A nOXGkfXooupWbLdROt3IhtANCH7Z20KV7CEs0QmkJSH6psEuDvZPcXm4KMNEKqMX2nJc oYvi/MtOlrhb1Sv86YpYOToFsBxCYeMwzolzRNN/2+LN6DHlNlaNBegYrwPitL3tJ3U9 R8tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=ewxZsA2sOKsYvtVwAS6LdLqeVgx5AXOVS7mYEisKyOo=; b=jADACSWHR2WJR4IYYBHLJKvS2N7PB5zF/oKFr72p7xtSlsUCJN5ARVFG3bHJaNAu7/ gh6bgT1ffOZZdTuegph9wZIz4j2zKxs0h+SJXnuM2tUWuvhrXzpEWgL0iQkX9lkLKkT9 PnY2Ug7/hhWfQBo+r2h6k8vHcmo28AquKWwv7DQk/aCKr0J6wkoFGtk6PO7e1fq7OZ47 mMKwrkpBIyD2VlVrX2kHfzHmvUjWeHCKrPwV+iyBRtLYlMo4QLyTydmeka6zMCh3v3Q5 t5Fa1QWeWcSdyHhMWWwza7A87pO5PrcBKlAehM3ll9IGct3JsVOjvkEVdj/Q7cQR7z39 KOpg== X-Gm-Message-State: AOAM532BEJoa21gcPoA163EHvcaBVrQe8iZMP7QkJQG8Y0wyduS8c5F7 nmw+ytuQRGQ5hH35dh0GoXE= X-Google-Smtp-Source: ABdhPJy5OpDtINvGIeTTw1imy9XHYqjGHJ6nYPjRzqXk66t/mQSKFM1YgwrIVwUIP1hUjlrNdIYyoQ== X-Received: by 2002:a17:90a:8589:: with SMTP id m9mr28316923pjn.109.1597071371386; Mon, 10 Aug 2020 07:56:11 -0700 (PDT) Received: from [10.1.10.11] (c-73-241-150-58.hsd1.ca.comcast.net. [73.241.150.58]) by smtp.gmail.com with ESMTPSA id 3sm19857146pjo.40.2020.08.10.07.56.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Aug 2020 07:56:10 -0700 (PDT) Subject: Re: [PATCH] bpf: Add bpf_skb_get_sock_comm() helper To: Jiang Yu , "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , John Fastabend , KP Singh , Eric Dumazet , Jakub Sitnicki , zhanglin , Kees Cook , Andrey Ignatov , Quentin Monnet , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: opensource.kernel@vivo.com References: <20200810131014.12057-1-jyu.jiang@vivo.com> From: Eric Dumazet Message-ID: <315a12d8-abd9-f9d3-a1b2-bcec8598a984@gmail.com> Date: Mon, 10 Aug 2020 07:56:08 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200810131014.12057-1-jyu.jiang@vivo.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/10/20 6:09 AM, Jiang Yu wrote: > skb distinguished by uid can only recorded to user who consume them. > in many case, skb should been recorded more specific to process who > consume them. E.g, the unexpected large data traffic of illegal process > in metered network. > > this helper is used in tracing task comm of the sock to which a skb > belongs. > > Signed-off-by: Jiang Yu fd can be passed from one process to another.