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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FBA2C7EE24 for ; Mon, 15 May 2023 16:36:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242778AbjEOQgZ (ORCPT ); Mon, 15 May 2023 12:36:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242776AbjEOQgY (ORCPT ); Mon, 15 May 2023 12:36:24 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA61C3AA3 for ; Mon, 15 May 2023 09:36:23 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4B1F46281D for ; Mon, 15 May 2023 16:36:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DA98C433D2; Mon, 15 May 2023 16:36:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684168582; bh=wfiNyLTaZ7nyVC3zFX/VtZjmfpkaYyoxJaQ/w6IGVt8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TrlYx7Mm1tuAwGpPajJYyCRgL3cUL8BrTvnVbV+qITiftMNKy0UemSK0EHakH12iE m/fjrkMyGY3+UrXQBmTZ409RxCSA4cjmg3fHSD/hA//ZbqbOZttbCx8OX8vq/DjF80 eLtkrpKiobwrUMa+fzym5CCKROcmNVcZrcx9cTfc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Palash Oswal , Kuniyuki Iwashima , Eric Dumazet , Cong Wang , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 089/116] sit: update dev->needed_headroom in ipip6_tunnel_bind_dev() Date: Mon, 15 May 2023 18:26:26 +0200 Message-Id: <20230515161701.229290912@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161658.228491273@linuxfoundation.org> References: <20230515161658.228491273@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Cong Wang [ Upstream commit c88f8d5cd95fd039cff95d682b8e71100c001df0 ] When a tunnel device is bound with the underlying device, its dev->needed_headroom needs to be updated properly. IPv4 tunnels already do the same in ip_tunnel_bind_dev(). Otherwise we may not have enough header room for skb, especially after commit b17f709a2401 ("gue: TX support for using remote checksum offload option"). Fixes: 32b8a8e59c9c ("sit: add IPv4 over IPv4 support") Reported-by: Palash Oswal Link: https://lore.kernel.org/netdev/CAGyP=7fDcSPKu6nttbGwt7RXzE3uyYxLjCSE97J64pRxJP8jPA@mail.gmail.com/ Cc: Kuniyuki Iwashima Cc: Eric Dumazet Signed-off-by: Cong Wang Reviewed-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/ipv6/sit.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index e5baf5e4782b0..f24a6cd0d15a3 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1039,12 +1039,13 @@ static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, static void ipip6_tunnel_bind_dev(struct net_device *dev) { + struct ip_tunnel *tunnel = netdev_priv(dev); + int t_hlen = tunnel->hlen + sizeof(struct iphdr); struct net_device *tdev = NULL; - struct ip_tunnel *tunnel; + int hlen = LL_MAX_HEADER; const struct iphdr *iph; struct flowi4 fl4; - tunnel = netdev_priv(dev); iph = &tunnel->parms.iph; if (iph->daddr) { @@ -1067,14 +1068,15 @@ static void ipip6_tunnel_bind_dev(struct net_device *dev) tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); if (tdev && !netif_is_l3_master(tdev)) { - int t_hlen = tunnel->hlen + sizeof(struct iphdr); int mtu; mtu = tdev->mtu - t_hlen; if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; WRITE_ONCE(dev->mtu, mtu); + hlen = tdev->hard_header_len + tdev->needed_headroom; } + dev->needed_headroom = t_hlen + hlen; } static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, -- 2.39.2