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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Subject: [PATCH 13/14] netfilter: nft_payload: cancel register tracking after payload update
Date: Sun,  9 Jan 2022 17:11:25 +0100	[thread overview]
Message-ID: <20220109161126.83917-14-pablo@netfilter.org> (raw)
In-Reply-To: <20220109161126.83917-1-pablo@netfilter.org>

The payload expression might mangle the packet, cancel register tracking
since any payload data in the registers is stale.

Finer grain register tracking cancellation by inspecting the payload
base, offset and length on the register is also possible.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_payload.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index b5a3c45727b3..940fed9a760b 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -801,12 +801,33 @@ static int nft_payload_set_dump(struct sk_buff *skb, const struct nft_expr *expr
 	return -1;
 }
 
+static bool nft_payload_set_reduce(struct nft_regs_track *track,
+				   const struct nft_expr *expr)
+{
+	int i;
+
+	for (i = 0; i < NFT_REG32_NUM; i++) {
+		if (!track->regs[i].selector)
+			continue;
+
+		if (track->regs[i].selector->ops != &nft_payload_ops &&
+		    track->regs[i].selector->ops != &nft_payload_fast_ops)
+			continue;
+
+		track->regs[i].selector = NULL;
+		track->regs[i].bitwise = NULL;
+	}
+
+	return false;
+}
+
 static const struct nft_expr_ops nft_payload_set_ops = {
 	.type		= &nft_payload_type,
 	.size		= NFT_EXPR_SIZE(sizeof(struct nft_payload_set)),
 	.eval		= nft_payload_set_eval,
 	.init		= nft_payload_set_init,
 	.dump		= nft_payload_set_dump,
+	.reduce		= nft_payload_set_reduce,
 };
 
 static const struct nft_expr_ops *
-- 
2.30.2


  parent reply	other threads:[~2022-01-09 16:11 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-09 16:11 [PATCH nf-next,v3 00/14] nf_tables datapath ruleset blob and register tracking Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 01/14] netfilter: nft_connlimit: move stateful fields out of expression data Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 02/14] netfilter: nft_last: " Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 03/14] netfilter: nft_quota: " Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 04/14] netfilter: nft_numgen: " Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 05/14] netfilter: nft_limit: rename stateful structure Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 06/14] netfilter: nft_limit: move stateful fields out of expression data Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 07/14] netfilter: nf_tables: add rule blob layout Pablo Neira Ayuso
2022-01-10 11:00   ` kernel test robot
2022-01-09 16:11 ` [PATCH 08/14] netfilter: nf_tables: add NFT_REG32_NUM Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 09/14] netfilter: nf_tables: add register tracking infrastructure Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 10/14] netfilter: nft_payload: track register operations Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 11/14] netfilter: nft_meta: " Pablo Neira Ayuso
2022-01-09 16:11 ` [PATCH 12/14] netfilter: nft_bitwise: " Pablo Neira Ayuso
2022-01-09 16:11 ` Pablo Neira Ayuso [this message]
2022-01-09 16:11 ` [PATCH 14/14] netfilter: nft_meta: cancel register tracking after meta update Pablo Neira Ayuso

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