From patchwork Sat Mar 6 12:12:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 395314 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 1BB32C4361A for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E992A64FE8 for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230527AbhCFMMz (ORCPT ); Sat, 6 Mar 2021 07:12:55 -0500 Received: from correo.us.es ([193.147.175.20]:45980 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230425AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 64C74C5170 for ; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 5119BDA792 for ; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 45D97DA704; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id E48E9DA704; Sat, 6 Mar 2021 13:12:27 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:27 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id BB16D42DC6E3; Sat, 6 Mar 2021 13:12:27 +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, kuba@kernel.org Subject: [PATCH net 1/9] uapi: nfnetlink_cthelper.h: fix userspace compilation error Date: Sat, 6 Mar 2021 13:12:15 +0100 Message-Id: <20210306121223.28711-2-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: "Dmitry V. Levin" Apparently, and could not be included into the same compilation unit because of a cut-and-paste typo in the former header. Fixes: 12f7a505331e6 ("netfilter: add user-space connection tracking helper infrastructure") Cc: # v3.6 Signed-off-by: Dmitry V. Levin Signed-off-by: Pablo Neira Ayuso --- include/uapi/linux/netfilter/nfnetlink_cthelper.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/netfilter/nfnetlink_cthelper.h b/include/uapi/linux/netfilter/nfnetlink_cthelper.h index a13137afc429..70af02092d16 100644 --- a/include/uapi/linux/netfilter/nfnetlink_cthelper.h +++ b/include/uapi/linux/netfilter/nfnetlink_cthelper.h @@ -5,7 +5,7 @@ #define NFCT_HELPER_STATUS_DISABLED 0 #define NFCT_HELPER_STATUS_ENABLED 1 -enum nfnl_acct_msg_types { +enum nfnl_cthelper_msg_types { NFNL_MSG_CTHELPER_NEW, NFNL_MSG_CTHELPER_GET, NFNL_MSG_CTHELPER_DEL, From patchwork Sat Mar 6 12:12:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 395316 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 45B40C433E6 for ; Sat, 6 Mar 2021 12:13:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13F2D6501B for ; Sat, 6 Mar 2021 12:13:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230458AbhCFMMu (ORCPT ); Sat, 6 Mar 2021 07:12:50 -0500 Received: from correo.us.es ([193.147.175.20]:45988 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230288AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id EEF18C516C for ; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id DEFFDDA78E for ; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id D4344DA789; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id A4806DA78C; Sat, 6 Mar 2021 13:12:28 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:28 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 78BB742DC6E2; Sat, 6 Mar 2021 13:12:28 +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, kuba@kernel.org Subject: [PATCH net 2/9] netfilter: conntrack: Remove a double space in a log message Date: Sat, 6 Mar 2021 13:12:16 +0100 Message-Id: <20210306121223.28711-3-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Klemen Košir Removed an extra space in a log message and an extra blank line in code. Signed-off-by: Klemen Košir Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_helper.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c index 118f415928ae..b055187235f8 100644 --- a/net/netfilter/nf_conntrack_helper.c +++ b/net/netfilter/nf_conntrack_helper.c @@ -219,7 +219,7 @@ nf_ct_lookup_helper(struct nf_conn *ct, struct net *net) return NULL; pr_info("nf_conntrack: default automatic helper assignment " "has been turned off for security reasons and CT-based " - " firewall rule not found. Use the iptables CT target " + "firewall rule not found. Use the iptables CT target " "to attach helpers instead.\n"); net->ct.auto_assign_helper_warned = 1; return NULL; @@ -228,7 +228,6 @@ nf_ct_lookup_helper(struct nf_conn *ct, struct net *net) return __nf_ct_helper_find(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); } - int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl, gfp_t flags) { From patchwork Sat Mar 6 12:12:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 395315 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 4BDC1C4332B for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A8D564FE8 for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230503AbhCFMMx (ORCPT ); Sat, 6 Mar 2021 07:12:53 -0500 Received: from correo.us.es ([193.147.175.20]:46328 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230421AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 045D0C516D for ; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id DBCFDDA78B for ; Sat, 6 Mar 2021 13:12:31 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id D0D27DA789; Sat, 6 Mar 2021 13:12:31 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 54693DA72F; Sat, 6 Mar 2021 13:12:29 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:29 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 29AC242DC6E2; Sat, 6 Mar 2021 13:12:29 +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, kuba@kernel.org Subject: [PATCH net 3/9] netfilter: nf_nat: undo erroneous tcp edemux lookup Date: Sat, 6 Mar 2021 13:12:17 +0100 Message-Id: <20210306121223.28711-4-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Florian Westphal Under extremely rare conditions TCP early demux will retrieve the wrong socket. 1. local machine establishes a connection to a remote server, S, on port p. This gives: laddr:lport -> S:p ... both in tcp and conntrack. 2. local machine establishes a connection to host H, on port p2. 2a. TCP stack choses same laddr:lport, so we have laddr:lport -> H:p2 from TCP point of view. 2b). There is a destination NAT rewrite in place, translating H:p2 to S:p. This results in following conntrack entries: I) laddr:lport -> S:p (origin) S:p -> laddr:lport (reply) II) laddr:lport -> H:p2 (origin) S:p -> laddr:lport2 (reply) NAT engine has rewritten laddr:lport to laddr:lport2 to map the reply packet to the correct origin. When server sends SYN/ACK to laddr:lport2, the PREROUTING hook will undo-the SNAT transformation, rewriting IP header to S:p -> laddr:lport This causes TCP early demux to associate the skb with the TCP socket of the first connection. The INPUT hook will then reverse the DNAT transformation, rewriting the IP header to H:p2 -> laddr:lport. Because packet ends up with the wrong socket, the new connection never completes: originator stays in SYN_SENT and conntrack entry remains in SYN_RECV until timeout, and responder retransmits SYN/ACK until it gives up. To resolve this, orphan the skb after the input rewrite: Because the source IP address changed, the socket must be incorrect. We can't move the DNAT undo to prerouting due to backwards compatibility, doing so will make iptables/nftables rules to no longer match the way they did. After orphan, the packet will be handed to the next protocol layer (tcp, udp, ...) and that will repeat the socket lookup just like as if early demux was disabled. Fixes: 41063e9dd1195 ("ipv4: Early TCP socket demux.") Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1427 Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_nat_proto.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/net/netfilter/nf_nat_proto.c b/net/netfilter/nf_nat_proto.c index e87b6bd6b3cd..4731d21fc3ad 100644 --- a/net/netfilter/nf_nat_proto.c +++ b/net/netfilter/nf_nat_proto.c @@ -646,8 +646,8 @@ nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, } static unsigned int -nf_nat_ipv4_in(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state) +nf_nat_ipv4_pre_routing(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) { unsigned int ret; __be32 daddr = ip_hdr(skb)->daddr; @@ -659,6 +659,23 @@ nf_nat_ipv4_in(void *priv, struct sk_buff *skb, return ret; } +static unsigned int +nf_nat_ipv4_local_in(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + __be32 saddr = ip_hdr(skb)->saddr; + struct sock *sk = skb->sk; + unsigned int ret; + + ret = nf_nat_ipv4_fn(priv, skb, state); + + if (ret == NF_ACCEPT && sk && saddr != ip_hdr(skb)->saddr && + !inet_sk_transparent(sk)) + skb_orphan(skb); /* TCP edemux obtained wrong socket */ + + return ret; +} + static unsigned int nf_nat_ipv4_out(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) @@ -736,7 +753,7 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, static const struct nf_hook_ops nf_nat_ipv4_ops[] = { /* Before packet filtering, change destination */ { - .hook = nf_nat_ipv4_in, + .hook = nf_nat_ipv4_pre_routing, .pf = NFPROTO_IPV4, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_NAT_DST, @@ -757,7 +774,7 @@ static const struct nf_hook_ops nf_nat_ipv4_ops[] = { }, /* After packet filtering, change source */ { - .hook = nf_nat_ipv4_fn, + .hook = nf_nat_ipv4_local_in, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_IN, .priority = NF_IP_PRI_NAT_SRC, From patchwork Sat Mar 6 12:12:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 394840 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 A0B22C43142 for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BE1964FE8 for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231153AbhCFMM5 (ORCPT ); Sat, 6 Mar 2021 07:12:57 -0500 Received: from correo.us.es ([193.147.175.20]:46346 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230401AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 48227C5179 for ; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 279E1DA789 for ; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 1C77CDA78B; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id EC719DA73D; Sat, 6 Mar 2021 13:12:29 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:29 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id C278742DC6E2; Sat, 6 Mar 2021 13:12:29 +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, kuba@kernel.org Subject: [PATCH net 4/9] netfilter: conntrack: avoid misleading 'invalid' in log message Date: Sat, 6 Mar 2021 13:12:18 +0100 Message-Id: <20210306121223.28711-5-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Florian Westphal The packet is not flagged as invalid: conntrack will accept it and its associated with the conntrack entry. This happens e.g. when receiving a retransmitted SYN in SYN_RECV state. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_proto_tcp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 1d7e1c595546..ec23330687a5 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -982,8 +982,10 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct, IP_CT_EXP_CHALLENGE_ACK; } spin_unlock_bh(&ct->lock); - nf_ct_l4proto_log_invalid(skb, ct, "invalid packet ignored in " - "state %s ", tcp_conntrack_names[old_state]); + nf_ct_l4proto_log_invalid(skb, ct, + "packet (index %d) in dir %d ignored, state %s", + index, dir, + tcp_conntrack_names[old_state]); return NF_ACCEPT; case TCP_CONNTRACK_MAX: /* Special case for SYN proxy: when the SYN to the server or From patchwork Sat Mar 6 12:12:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 395312 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 9C945C4321A for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CFC56501B for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230514AbhCFMMy (ORCPT ); Sat, 6 Mar 2021 07:12:54 -0500 Received: from correo.us.es ([193.147.175.20]:46376 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230431AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 19305C517D for ; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 09535DA793 for ; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id F281ADA704; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 8AF71DA704; Sat, 6 Mar 2021 13:12:30 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:30 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 610A442DC6E2; Sat, 6 Mar 2021 13:12:30 +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, kuba@kernel.org Subject: [PATCH net 5/9] selftests: netfilter: test nat port clash resolution interaction with tcp early demux Date: Sat, 6 Mar 2021 13:12:19 +0100 Message-Id: <20210306121223.28711-6-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Florian Westphal Convert Antonio Ojeas bug reproducer to a kselftest. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- tools/testing/selftests/netfilter/Makefile | 2 +- .../selftests/netfilter/nf_nat_edemux.sh | 99 +++++++++++++++++++ 2 files changed, 100 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/netfilter/nf_nat_edemux.sh diff --git a/tools/testing/selftests/netfilter/Makefile b/tools/testing/selftests/netfilter/Makefile index 3006a8e5b41a..3171069a6b46 100644 --- a/tools/testing/selftests/netfilter/Makefile +++ b/tools/testing/selftests/netfilter/Makefile @@ -4,7 +4,7 @@ TEST_PROGS := nft_trans_stress.sh nft_nat.sh bridge_brouter.sh \ conntrack_icmp_related.sh nft_flowtable.sh ipvs.sh \ nft_concat_range.sh nft_conntrack_helper.sh \ - nft_queue.sh nft_meta.sh \ + nft_queue.sh nft_meta.sh nf_nat_edemux.sh \ ipip-conntrack-mtu.sh LDLIBS = -lmnl diff --git a/tools/testing/selftests/netfilter/nf_nat_edemux.sh b/tools/testing/selftests/netfilter/nf_nat_edemux.sh new file mode 100755 index 000000000000..cfee3b65be0f --- /dev/null +++ b/tools/testing/selftests/netfilter/nf_nat_edemux.sh @@ -0,0 +1,99 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Test NAT source port clash resolution +# + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 +ret=0 + +sfx=$(mktemp -u "XXXXXXXX") +ns1="ns1-$sfx" +ns2="ns2-$sfx" + +cleanup() +{ + ip netns del $ns1 + ip netns del $ns2 +} + +iperf3 -v > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without iperf3" + exit $ksft_skip +fi + +iptables --version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without iptables" + exit $ksft_skip +fi + +ip -Version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without ip tool" + exit $ksft_skip +fi + +ip netns add "$ns1" +if [ $? -ne 0 ];then + echo "SKIP: Could not create net namespace $ns1" + exit $ksft_skip +fi + +trap cleanup EXIT + +ip netns add $ns2 + +# Connect the namespaces using a veth pair +ip link add name veth2 type veth peer name veth1 +ip link set netns $ns1 dev veth1 +ip link set netns $ns2 dev veth2 + +ip netns exec $ns1 ip link set up dev lo +ip netns exec $ns1 ip link set up dev veth1 +ip netns exec $ns1 ip addr add 192.168.1.1/24 dev veth1 + +ip netns exec $ns2 ip link set up dev lo +ip netns exec $ns2 ip link set up dev veth2 +ip netns exec $ns2 ip addr add 192.168.1.2/24 dev veth2 + +# Create a server in one namespace +ip netns exec $ns1 iperf3 -s > /dev/null 2>&1 & +iperfs=$! + +# Restrict source port to just one so we don't have to exhaust +# all others. +ip netns exec $ns2 sysctl -q net.ipv4.ip_local_port_range="10000 10000" + +# add a virtual IP using DNAT +ip netns exec $ns2 iptables -t nat -A OUTPUT -d 10.96.0.1/32 -p tcp --dport 443 -j DNAT --to-destination 192.168.1.1:5201 + +# ... and route it to the other namespace +ip netns exec $ns2 ip route add 10.96.0.1 via 192.168.1.1 + +sleep 1 + +# add a persistent connection from the other namespace +ip netns exec $ns2 nc -q 10 -w 10 192.168.1.1 5201 > /dev/null & + +sleep 1 + +# ip daddr:dport will be rewritten to 192.168.1.1 5201 +# NAT must reallocate source port 10000 because +# 192.168.1.2:10000 -> 192.168.1.1:5201 is already in use +echo test | ip netns exec $ns2 nc -w 3 -q 3 10.96.0.1 443 >/dev/null +ret=$? + +kill $iperfs + +# Check nc can connect to 10.96.0.1:443 (aka 192.168.1.1:5201). +if [ $ret -eq 0 ]; then + echo "PASS: nc can connect via NAT'd address" +else + echo "FAIL: nc cannot connect via NAT'd address" + exit 1 +fi + +exit 0 From patchwork Sat Mar 6 12:12:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 394843 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 6DDABC43333 for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DF906501D for ; Sat, 6 Mar 2021 12:13:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230492AbhCFMMw (ORCPT ); Sat, 6 Mar 2021 07:12:52 -0500 Received: from correo.us.es ([193.147.175.20]:46382 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230426AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id AC288C517F for ; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 9542ADA791 for ; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 8A6A7DA78C; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 2DC99DA73F; Sat, 6 Mar 2021 13:12:31 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:31 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 04D2642DC6E2; Sat, 6 Mar 2021 13:12:30 +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, kuba@kernel.org Subject: [PATCH net 6/9] netfilter: x_tables: gpf inside xt_find_revision() Date: Sat, 6 Mar 2021 13:12:20 +0100 Message-Id: <20210306121223.28711-7-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Vasily Averin nested target/match_revfn() calls work with xt[NFPROTO_UNSPEC] lists without taking xt[NFPROTO_UNSPEC].mutex. This can race with module unload and cause host to crash: general protection fault: 0000 [#1] Modules linked in: ... [last unloaded: xt_cluster] CPU: 0 PID: 542455 Comm: iptables RIP: 0010:[] [] strcmp+0x18/0x40 RDX: 0000000000000003 RSI: ffff9a5a5d9abe10 RDI: dead000000000111 R13: ffff9a5a5d9abe10 R14: ffff9a5a5d9abd8c R15: dead000000000100 (VvS: %R15 -- &xt_match, %RDI -- &xt_match.name, xt_cluster unregister match in xt[NFPROTO_UNSPEC].match list) Call Trace: [] match_revfn+0x54/0xc0 [] match_revfn+0xaf/0xc0 [] xt_find_revision+0x6e/0xf0 [] do_ipt_get_ctl+0x100/0x420 [ip_tables] [] nf_getsockopt+0x4f/0x70 [] ip_getsockopt+0xde/0x100 [] raw_getsockopt+0x25/0x50 [] sock_common_getsockopt+0x1a/0x20 [] SyS_getsockopt+0x7d/0xf0 [] system_call_fastpath+0x25/0x2a Fixes: 656caff20e1 ("netfilter 04/09: x_tables: fix match/target revision lookup") Signed-off-by: Vasily Averin Reviewed-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/x_tables.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index acce622582e3..bce6ca203d46 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -330,6 +330,7 @@ static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) const struct xt_match *m; int have_rev = 0; + mutex_lock(&xt[af].mutex); list_for_each_entry(m, &xt[af].match, list) { if (strcmp(m->name, name) == 0) { if (m->revision > *bestp) @@ -338,6 +339,7 @@ static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) have_rev = 1; } } + mutex_unlock(&xt[af].mutex); if (af != NFPROTO_UNSPEC && !have_rev) return match_revfn(NFPROTO_UNSPEC, name, revision, bestp); @@ -350,6 +352,7 @@ static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) const struct xt_target *t; int have_rev = 0; + mutex_lock(&xt[af].mutex); list_for_each_entry(t, &xt[af].target, list) { if (strcmp(t->name, name) == 0) { if (t->revision > *bestp) @@ -358,6 +361,7 @@ static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) have_rev = 1; } } + mutex_unlock(&xt[af].mutex); if (af != NFPROTO_UNSPEC && !have_rev) return target_revfn(NFPROTO_UNSPEC, name, revision, bestp); @@ -371,12 +375,10 @@ int xt_find_revision(u8 af, const char *name, u8 revision, int target, { int have_rev, best = -1; - mutex_lock(&xt[af].mutex); if (target == 1) have_rev = target_revfn(af, name, revision, &best); else have_rev = match_revfn(af, name, revision, &best); - mutex_unlock(&xt[af].mutex); /* Nothing at all? Return 0 to try loading module. */ if (best == -1) { From patchwork Sat Mar 6 12:12:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 394842 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 7D8E7C4160E for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 646656501C for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231138AbhCFMMz (ORCPT ); Sat, 6 Mar 2021 07:12:55 -0500 Received: from correo.us.es ([193.147.175.20]:46392 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230403AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 066FAF2583 for ; Sat, 6 Mar 2021 13:12:34 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id EAA19DA78D for ; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id DF9D1DA73F; Sat, 6 Mar 2021 13:12:33 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id B4032DA78D; Sat, 6 Mar 2021 13:12:31 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:31 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 897E042DC6E2; Sat, 6 Mar 2021 13:12:31 +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, kuba@kernel.org Subject: [PATCH net 7/9] netfilter: nftables: disallow updates on table ownership Date: Sat, 6 Mar 2021 13:12:21 +0100 Message-Id: <20210306121223.28711-8-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Disallow updating the ownership bit on an existing table: Do not allow to grab ownership on an existing table. Do not allow to drop ownership on an existing table. Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index c1eb5cdb3033..b07703e19108 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -916,6 +916,12 @@ static int nf_tables_updtable(struct nft_ctx *ctx) if (flags == ctx->table->flags) return 0; + if ((nft_table_has_owner(ctx->table) && + !(flags & NFT_TABLE_F_OWNER)) || + (!nft_table_has_owner(ctx->table) && + flags & NFT_TABLE_F_OWNER)) + return -EOPNOTSUPP; + trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, sizeof(struct nft_trans_table)); if (trans == NULL) From patchwork Sat Mar 6 12:12:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 395313 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 B6637C4161F for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9202A6501B for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231159AbhCFMM6 (ORCPT ); Sat, 6 Mar 2021 07:12:58 -0500 Received: from correo.us.es ([193.147.175.20]:46402 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230411AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 8E262F258A for ; Sat, 6 Mar 2021 13:12:34 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 7D518DA78F for ; Sat, 6 Mar 2021 13:12:34 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 7263FDA78B; Sat, 6 Mar 2021 13:12:34 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 3EE80DA722; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:32 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 1508242DC6E2; Sat, 6 Mar 2021 13:12:32 +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, kuba@kernel.org Subject: [PATCH net 8/9] netfilter: nftables: fix possible double hook unregistration with table owner Date: Sat, 6 Mar 2021 13:12:22 +0100 Message-Id: <20210306121223.28711-9-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Skip hook unregistration of owner tables from the netns exit path, nft_rcv_nl_event() unregisters the table hooks before tearing down the table content. Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index b07703e19108..796ce86ef7eb 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -9028,8 +9028,12 @@ static void __nft_release_hooks(struct net *net) { struct nft_table *table; - list_for_each_entry(table, &net->nft.tables, list) + list_for_each_entry(table, &net->nft.tables, list) { + if (nft_table_has_owner(table)) + continue; + __nft_release_hook(net, table); + } } static void __nft_release_table(struct net *net, struct nft_table *table) From patchwork Sat Mar 6 12:12:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 394841 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 75CC8C4361B for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41FC56501B for ; Sat, 6 Mar 2021 12:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231145AbhCFMM4 (ORCPT ); Sat, 6 Mar 2021 07:12:56 -0500 Received: from correo.us.es ([193.147.175.20]:46414 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230429AbhCFMMk (ORCPT ); Sat, 6 Mar 2021 07:12:40 -0500 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id 10C4CF2591 for ; Sat, 6 Mar 2021 13:12:35 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 02259DA78D for ; Sat, 6 Mar 2021 13:12:35 +0100 (CET) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id EB2C3DA78A; Sat, 6 Mar 2021 13:12:34 +0100 (CET) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id BB8D9DA789; Sat, 6 Mar 2021 13:12:32 +0100 (CET) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Sat, 06 Mar 2021 13:12:32 +0100 (CET) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from localhost.localdomain (unknown [90.77.255.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pneira@us.es) by entrada.int (Postfix) with ESMTPSA id 9205742DC6E3; Sat, 6 Mar 2021 13:12:32 +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, kuba@kernel.org Subject: [PATCH net 9/9] netfilter: nftables: bogus check for netlink portID with table owner Date: Sat, 6 Mar 2021 13:12:23 +0100 Message-Id: <20210306121223.28711-10-pablo@netfilter.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210306121223.28711-1-pablo@netfilter.org> References: <20210306121223.28711-1-pablo@netfilter.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The existing branch checks for 0 != table->nlpid which always evaluates true for tables that have an owner. Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 796ce86ef7eb..224c8e537cb3 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -9083,13 +9083,12 @@ static void __nft_release_table(struct net *net, struct nft_table *table) nf_tables_table_destroy(&ctx); } -static void __nft_release_tables(struct net *net, u32 nlpid) +static void __nft_release_tables(struct net *net) { struct nft_table *table, *nt; list_for_each_entry_safe(table, nt, &net->nft.tables, list) { - if (nft_table_has_owner(table) && - nlpid != table->nlpid) + if (nft_table_has_owner(table)) continue; __nft_release_table(net, table); @@ -9155,7 +9154,7 @@ static void __net_exit nf_tables_exit_net(struct net *net) mutex_lock(&net->nft.commit_mutex); if (!list_empty(&net->nft.commit_list)) __nf_tables_abort(net, NFNL_ABORT_NONE); - __nft_release_tables(net, 0); + __nft_release_tables(net); mutex_unlock(&net->nft.commit_mutex); WARN_ON_ONCE(!list_empty(&net->nft.tables)); WARN_ON_ONCE(!list_empty(&net->nft.module_list));