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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 75327C282DD for ; Wed, 8 Jan 2020 23:17:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 54BBC20692 for ; Wed, 8 Jan 2020 23:17:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727636AbgAHXRi (ORCPT ); Wed, 8 Jan 2020 18:17:38 -0500 Received: from correo.us.es ([193.147.175.20]:43182 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727282AbgAHXRY (ORCPT ); Wed, 8 Jan 2020 18:17:24 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id C74D7FF9A1 for ; Thu, 9 Jan 2020 00:17:22 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id BB94FDA713 for ; Thu, 9 Jan 2020 00:17:22 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id BAE15DA709; Thu, 9 Jan 2020 00:17:22 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id ADBE4DA711; Thu, 9 Jan 2020 00:17:20 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Thu, 09 Jan 2020 00:17:20 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from salvia.here (unknown [90.77.255.23]) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPA id 882E6426CCB9; Thu, 9 Jan 2020 00:17:20 +0100 (CET) X-SMTPAUTHUS: auth mail.us.es From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org Subject: [PATCH 4/9] netfilter: nf_flow_table_offload: check the status of dst_neigh Date: Thu, 9 Jan 2020 00:17:08 +0100 Message-Id: <20200108231713.100458-5-pablo@netfilter.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200108231713.100458-1-pablo@netfilter.org> References: <20200108231713.100458-1-pablo@netfilter.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org From: wenxu It is better to get the dst_neigh with neigh->lock and check the nud_state is VALID. If there is not neigh previous, the lookup will Create a non NUD_VALID with 00:00:00:00:00:00 mac. Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support") Signed-off-by: wenxu Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_flow_table_offload.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c index ee9edbe50d4f..92b0bd241073 100644 --- a/net/netfilter/nf_flow_table_offload.c +++ b/net/netfilter/nf_flow_table_offload.c @@ -170,8 +170,10 @@ static int flow_offload_eth_dst(struct net *net, struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule); const void *daddr = &flow->tuplehash[!dir].tuple.src_v4; const struct dst_entry *dst_cache; + unsigned char ha[ETH_ALEN]; struct neighbour *n; u32 mask, val; + u8 nud_state; u16 val16; dst_cache = flow->tuplehash[dir].tuple.dst_cache; @@ -179,13 +181,23 @@ static int flow_offload_eth_dst(struct net *net, if (!n) return -ENOENT; + read_lock_bh(&n->lock); + nud_state = n->nud_state; + ether_addr_copy(ha, n->ha); + read_unlock_bh(&n->lock); + + if (!(nud_state & NUD_VALID)) { + neigh_release(n); + return -ENOENT; + } + mask = ~0xffffffff; - memcpy(&val, n->ha, 4); + memcpy(&val, ha, 4); flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 0, &val, &mask); mask = ~0x0000ffff; - memcpy(&val16, n->ha + 4, 2); + memcpy(&val16, ha + 4, 2); val = val16; flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4, &val, &mask); -- 2.11.0