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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 1482FC432C3 for ; Mon, 15 Mar 2021 14:08:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDEA564EFE for ; Mon, 15 Mar 2021 14:08:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235581AbhCOOHy (ORCPT ); Mon, 15 Mar 2021 10:07:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:36788 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232093AbhCON6H (ORCPT ); Mon, 15 Mar 2021 09:58:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BBC9C64EF9; Mon, 15 Mar 2021 13:58:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816684; bh=iDE8WNAc2YpEAw+DCtortrJQ9uhD2hnReSWZ40rFk4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ig0gW8pjj99v9ifzGoOxqtBDGCxTZzmBErolHP+sbjTOkH5Bh7qctFH31NQ+WyKzS kGvyc76nIsAjyG1MYljA45mr/FdmsqcgCO+Dz10i11hhtSIbcgC+KdKLkkb5lyHPLQ 8byyGiADi/dQP0tc3K6wcIdWdyTWCw/+UM5NbFh8= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maxim Mikityanskiy , "David S. Miller" Subject: [PATCH 4.19 005/120] net: Introduce parse_protocol header_ops callback Date: Mon, 15 Mar 2021 14:55:56 +0100 Message-Id: <20210315135720.187858706@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135720.002213995@linuxfoundation.org> References: <20210315135720.002213995@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg Kroah-Hartman From: Maxim Mikityanskiy commit e78b2915517e8fcadb1bc130ad6aeac7099e510c upstream. Introduce a new optional header_ops callback called parse_protocol and a wrapper function dev_parse_header_protocol, similar to dev_parse_header. The new callback's purpose is to extract the protocol number from the L2 header, the format of which is known to the driver, but not to the upper layers of the stack. Signed-off-by: Maxim Mikityanskiy Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/netdevice.h | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -274,6 +274,7 @@ struct header_ops { const struct net_device *dev, const unsigned char *haddr); bool (*validate)(const char *ll_header, unsigned int len); + __be16 (*parse_protocol)(const struct sk_buff *skb); }; /* These flag bits are private to the generic network queueing @@ -2895,6 +2896,15 @@ static inline int dev_parse_header(const return dev->header_ops->parse(skb, haddr); } +static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb) +{ + const struct net_device *dev = skb->dev; + + if (!dev->header_ops || !dev->header_ops->parse_protocol) + return 0; + return dev->header_ops->parse_protocol(skb); +} + /* ll_header must have at least hard_header_len allocated */ static inline bool dev_validate_header(const struct net_device *dev, char *ll_header, int len)