From patchwork Mon Mar 1 16:13:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 390006 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=-18.8 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=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 CA123C43381 for ; Mon, 1 Mar 2021 17:21:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DEEF65054 for ; Mon, 1 Mar 2021 17:21:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237642AbhCARUf (ORCPT ); Mon, 1 Mar 2021 12:20:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:49744 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237846AbhCARNe (ORCPT ); Mon, 1 Mar 2021 12:13:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 98A1B64E56; Mon, 1 Mar 2021 16:44:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614617069; bh=KSf82lTJOsAR86YB5kyc709rvTXQfXjMCYfqyKK9f4E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QnPm+xyZPxkpv0/q+qp0Q3PU0974dP1/mdjP6uCN2U2lxthZ8aiySpmRG+sjjwYPR 5I1DArwuH8ZU+4gyUlQIjeOe2rNw6yAOAyVq1ltY+skPTkVA0mLiQmFoxXZx7oglUL dZN/Ssp10P1MVRZulzFHu0rMz5uAkOcXmrRphl18= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Slawomir Laba , Przemyslaw Patynowski , Aleksandr Loktionov , Tony Brelinski , Tony Nguyen , Sasha Levin Subject: [PATCH 4.19 162/247] i40e: Fix flow for IPv6 next header (extension header) Date: Mon, 1 Mar 2021 17:13:02 +0100 Message-Id: <20210301161039.596142543@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161031.684018251@linuxfoundation.org> References: <20210301161031.684018251@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Slawomir Laba [ Upstream commit 92c6058024e87087cf1b99b0389d67c0a886360e ] When a packet contains an IPv6 header with next header which is an extension header and not a protocol one, the kernel function skb_transport_header called with such sk_buff will return a pointer to the extension header and not to the TCP one. The above explained call caused a problem with packet processing for skb with encapsulation for tunnel with I40E_TX_CTX_EXT_IP_IPV6. The extension header was not skipped at all. The ipv6_skip_exthdr function does check if next header of the IPV6 header is an extension header and doesn't modify the l4_proto pointer if it points to a protocol header value so its safe to omit the comparison of exthdr and l4.hdr pointers. The ipv6_skip_exthdr can return value -1. This means that the skipping process failed and there is something wrong with the packet so it will be dropped. Fixes: a3fd9d8876a5 ("i40e/i40evf: Handle IPv6 extension headers in checksum offload") Signed-off-by: Slawomir Laba Signed-off-by: Przemyslaw Patynowski Reviewed-by: Aleksandr Loktionov Tested-by: Tony Brelinski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index b5042d1a63c0b..9ccbcd88bf1e6 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -3070,13 +3070,16 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags, l4_proto = ip.v4->protocol; } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { + int ret; + tunnel |= I40E_TX_CTX_EXT_IP_IPV6; exthdr = ip.hdr + sizeof(*ip.v6); l4_proto = ip.v6->nexthdr; - if (l4.hdr != exthdr) - ipv6_skip_exthdr(skb, exthdr - skb->data, - &l4_proto, &frag_off); + ret = ipv6_skip_exthdr(skb, exthdr - skb->data, + &l4_proto, &frag_off); + if (ret < 0) + return -1; } /* define outer transport */