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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Todd Seidelmann <tseidelmann@linode.com>,
        Florian Westphal <fw@strlen.de>,
        Pablo Neira Ayuso <pablo@netfilter.org>,
        Sasha Levin <sashal@kernel.org>,
        netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
        netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.2 51/94] netfilter: xt_physdev: Fix spurious error message in physdev_mt_check
Date:   Wed,  4 Sep 2019 11:56:56 -0400
Message-Id: <20190904155739.2816-51-sashal@kernel.org>
In-Reply-To: <20190904155739.2816-1-sashal@kernel.org>
References: <20190904155739.2816-1-sashal@kernel.org>
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From: Todd Seidelmann <tseidelmann@linode.com>

[ Upstream commit 3cf2f450fff304be9cf4868bf0df17f253bc5b1c ]

Simplify the check in physdev_mt_check() to emit an error message
only when passed an invalid chain (ie, NF_INET_LOCAL_OUT).
This avoids cluttering up the log with errors against valid rules.

For large/heavily modified rulesets, current behavior can quickly
overwhelm the ring buffer, because this function gets called on
every change, regardless of the rule that was changed.

Signed-off-by: Todd Seidelmann <tseidelmann@linode.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/netfilter/xt_physdev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
index ead7c60222086..b92b22ce8abd3 100644
--- a/net/netfilter/xt_physdev.c
+++ b/net/netfilter/xt_physdev.c
@@ -101,11 +101,9 @@ static int physdev_mt_check(const struct xt_mtchk_param *par)
 	if (info->bitmask & (XT_PHYSDEV_OP_OUT | XT_PHYSDEV_OP_ISOUT) &&
 	    (!(info->bitmask & XT_PHYSDEV_OP_BRIDGED) ||
 	     info->invert & XT_PHYSDEV_OP_BRIDGED) &&
-	    par->hook_mask & ((1 << NF_INET_LOCAL_OUT) |
-	    (1 << NF_INET_FORWARD) | (1 << NF_INET_POST_ROUTING))) {
+	    par->hook_mask & (1 << NF_INET_LOCAL_OUT)) {
 		pr_info_ratelimited("--physdev-out and --physdev-is-out only supported in the FORWARD and POSTROUTING chains with bridged traffic\n");
-		if (par->hook_mask & (1 << NF_INET_LOCAL_OUT))
-			return -EINVAL;
+		return -EINVAL;
 	}
 
 	if (!brnf_probed) {
-- 
2.20.1