From 15f5fe9e84839dcc9eaa69b08ced9d24cb464369 Mon Sep 17 00:00:00 2001
From: Antony Antony <antony.antony@secunet.com>
Date: Tue, 11 Jun 2024 08:32:15 +0200
Subject: xfrm: Log input direction mismatch error in one place
Previously, the offload data path decrypted the packet before checking
the direction, leading to error logging and packet dropping. However,
dropped packets wouldn't be visible in tcpdump or audit log.
With this fix, the offload path, upon noticing SA direction mismatch,
will pass the packet to the stack without decrypting it. The L3 layer
will then log the error, audit, and drop ESP without decrypting or
decapsulating it.
This also ensures that the slow path records the error and audit log,
making dropped packets visible in tcpdump.
Fixes: 304b44f0d5a4 ("xfrm: Add dir validation to "in" data path lookup")
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
net/xfrm/xfrm_input.c | 5 -----
1 file changed, 5 deletions(-)
(limited to 'net/xfrm/xfrm_input.c')
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 63c004103912..e95462b982b0 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -474,11 +474,6 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) {
x = xfrm_input_state(skb);
- if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
- XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
- goto drop;
- }
-
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
if (x->km.state == XFRM_STATE_ACQ)
XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
--
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