From patchwork Tue Jul 26 19:20:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Westphal X-Patchwork-Id: 12929712 X-Patchwork-Delegate: kuba@kernel.org 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 A3F1AC04A68 for ; Tue, 26 Jul 2022 19:21:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239785AbiGZTVm (ORCPT ); Tue, 26 Jul 2022 15:21:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239784AbiGZTVl (ORCPT ); Tue, 26 Jul 2022 15:21:41 -0400 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [IPv6:2a0a:51c0:0:12e:520::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9801033E39 for ; Tue, 26 Jul 2022 12:21:39 -0700 (PDT) Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92) (envelope-from ) id 1oGQ7e-00081Q-20; Tue, 26 Jul 2022 21:21:38 +0200 From: Florian Westphal To: Cc: Paolo Abeni , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Florian Westphal , Pablo Neira Ayuso Subject: [PATCH net 3/3] netfilter: nft_queue: only allow supported familes and hooks Date: Tue, 26 Jul 2022 21:20:56 +0200 Message-Id: <20220726192056.13497-4-fw@strlen.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220726192056.13497-1-fw@strlen.de> References: <20220726192056.13497-1-fw@strlen.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Trying to use 'queue' statement in ingress (for example) triggers a splat on reinject: WARNING: CPU: 3 PID: 1345 at net/netfilter/nf_queue.c:291 ... because nf_reinject cannot find the ruleset head. The netdev family doesn't support async resume at the moment anyway, so disallow loading such rulesets with a more appropriate error message. v2: add 'validate' callback and also check hook points, v1 did allow ingress use in 'table inet', but that doesn't work either. (Pablo) Signed-off-by: Florian Westphal Reviewed-by: Pablo Neira Ayuso --- net/netfilter/nft_queue.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/net/netfilter/nft_queue.c b/net/netfilter/nft_queue.c index 15e4b7640dc0..da29e92c03e2 100644 --- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -68,6 +68,31 @@ static void nft_queue_sreg_eval(const struct nft_expr *expr, regs->verdict.code = ret; } +static int nft_queue_validate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nft_data **data) +{ + static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING)); + + switch (ctx->family) { + case NFPROTO_IPV4: + case NFPROTO_IPV6: + case NFPROTO_INET: + case NFPROTO_BRIDGE: + break; + case NFPROTO_NETDEV: /* lacks okfn */ + fallthrough; + default: + return -EOPNOTSUPP; + } + + return nft_chain_validate_hooks(ctx->chain, supported_hooks); +} + static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = { [NFTA_QUEUE_NUM] = { .type = NLA_U16 }, [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 }, @@ -164,6 +189,7 @@ static const struct nft_expr_ops nft_queue_ops = { .eval = nft_queue_eval, .init = nft_queue_init, .dump = nft_queue_dump, + .validate = nft_queue_validate, .reduce = NFT_REDUCE_READONLY, }; @@ -173,6 +199,7 @@ static const struct nft_expr_ops nft_queue_sreg_ops = { .eval = nft_queue_sreg_eval, .init = nft_queue_sreg_init, .dump = nft_queue_sreg_dump, + .validate = nft_queue_validate, .reduce = NFT_REDUCE_READONLY, };