From patchwork Mon Apr 12 18:40:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 12198637 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C9264C433ED for ; Mon, 12 Apr 2021 18:40:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9956361221 for ; Mon, 12 Apr 2021 18:40:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244543AbhDLSk5 (ORCPT ); Mon, 12 Apr 2021 14:40:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237179AbhDLSk4 (ORCPT ); Mon, 12 Apr 2021 14:40:56 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 451C8C061574 for ; Mon, 12 Apr 2021 11:40:37 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id s14so2278927pjl.5 for ; Mon, 12 Apr 2021 11:40:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=Uq2AbQRzRKbo1fXWbQj4G5cuhsfQXMYrbmYBMQQOT2k=; b=CFeVir3NMJDAKGJFOWWlp9iee1dFSP5W37MXz8Ha4esP0l6dMmunnp/dtBvnKaTn7V Kkh7wHrSXU/lcQZ+9cSWldWRRjKh+yu+CQSuivjs5M4Tc83XI8P0G6z59sDXxjtgGXFC sVP2uAm5zxsvu+i1Y0pvdqQsEx+DaJ9oPketOOnnPA4X+AABEuVWpJ78srC8vgfwkeFC gq+bEsU6tqP0j7hCPO1SIXmKiNrEUxpifb8K44/QZ4zN1+J3UNawBcAIOESwhRvOuqj/ ro6MtOxUTeZpsSQX6+28KoOwyRmiq/jg4fXpS472jSzHQDVnh1e5L361bovjGOnIo+vi 5mXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=Uq2AbQRzRKbo1fXWbQj4G5cuhsfQXMYrbmYBMQQOT2k=; b=bnd5gKC8Bzf9uLnUpsX/lyr/g+Ej9Mybe9792YCyysHTz/npF7vTgiGGoAzfZmjfe0 x0n54XcnnP551nx8ENfl7AOJT9qmYIfHQWO5GzRp/eao22CVeaycV3+TdZVobCFv5TOH zt/aMUpTq4fPr8Hx+WJUcJmcqzPgpHMoRmzVKCqNJA//62TGu6hykGOuBlNQRaNn6k77 7fg53x6B5f0AbiBmtF6kBqz4BclbzuQBRQe/o2W3EpnSGuJI1a/W6XJiF0jKyPwxrZU3 y26eDSzN912roAf0pw/Yd0ryJ/JWpC8noZWIqJs93eLeKzvGVGBdiHPO7+ERqefbMuKJ WNvQ== X-Gm-Message-State: AOAM532RkC6E/dqjdRGHVAQHYXe9T2qVkLJsNyxDtvWCHtrr+9ZH9SC6 BOtZB7HWEiChP/d1HRG+OoK0q7+E2daafw== X-Google-Smtp-Source: ABdhPJzXQO0AOu+T0Uj9a6+L48y08tbvTefFknQ3tlLvJYj1Lp9Mn4UclasjgL5TP/oqPDe8pDtCVg== X-Received: by 2002:a17:90a:d701:: with SMTP id y1mr594261pju.1.1618252836476; Mon, 12 Apr 2021 11:40:36 -0700 (PDT) Received: from localhost.localdomain (c-71-56-157-77.hsd1.or.comcast.net. [71.56.157.77]) by smtp.gmail.com with ESMTPSA id v13sm9773551pfu.54.2021.04.12.11.40.36 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Apr 2021 11:40:36 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [RFC 1/2] Bluetooth: Introduce bt_skb_pull Date: Mon, 12 Apr 2021 11:40:32 -0700 Message-Id: <20210412184033.2504931-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz This adds bt_skb_pull which will be used to parse events, it checks the skb contains the given length and then use skb_pull to advance in data which avoid having to rely on another variable to track the position in the buffer. Signed-off-by: Luiz Augusto von Dentz --- include/net/bluetooth/bluetooth.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h index 9125effbf448..449bc8e112f9 100644 --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -420,6 +420,18 @@ static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk, return NULL; } +static inline void *bt_skb_pull(struct sk_buff *skb, size_t len) +{ + void *data = skb->data; + + if (skb->len < len) + return NULL; + + skb_pull(skb, len); + + return data; +} + int bt_to_errno(u16 code); void hci_sock_set_flag(struct sock *sk, int nr);