netdev - [PATCH ipsec-next v11 3/4] xfrm: Add dir validation to "in" data path lookup

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Message-ID: <2472b2895678403d96059446e63b24a7e921e880.1713737786.git.antony.antony@secunet.com>
Date: Mon, 22 Apr 2024 00:29:50 +0200
From: Antony Antony <antony.antony@...unet.com>
To: Steffen Klassert <steffen.klassert@...unet.com>, Herbert Xu
	<herbert@...dor.apana.org.au>, <netdev@...r.kernel.org>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <devel@...ux-ipsec.org>, Leon Romanovsky
	<leon@...nel.org>, Eyal Birger <eyal.birger@...il.com>, Nicolas Dichtel
	<nicolas.dichtel@...nd.com>, Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH ipsec-next v11 3/4] xfrm: Add dir validation to "in" data
 path lookup

Introduces validation for the x->dir attribute within the XFRM input
data lookup path. If the configured direction does not match the
expected direction, input, increment the XfrmInStateDirError counter 
and drop the packet to ensure data integrity and correct flow handling.

grep -vw 0 /proc/net/xfrm_stat
XfrmInStateDirError     	1

Signed-off-by: Antony Antony <antony.antony@...unet.com>

v10->v11
- rename error s/XfrmInDirError/XfrmInStateDirError/
---
 include/uapi/linux/snmp.h |  1 +
 net/ipv6/xfrm6_input.c    |  7 +++++++
 net/xfrm/xfrm_input.c     | 11 +++++++++++
 net/xfrm/xfrm_proc.c      |  1 +
 4 files changed, 20 insertions(+)

diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index 23792b8412bd..adf5fd78dd50 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -338,6 +338,7 @@ enum
 	LINUX_MIB_XFRMOUTSTATEINVALID,		/* XfrmOutStateInvalid */
 	LINUX_MIB_XFRMACQUIREERROR,		/* XfrmAcquireError */
 	LINUX_MIB_XFRMOUTSTATEDIRERROR,		/* XfrmOutStateDirError */
+	LINUX_MIB_XFRMINSTATEDIRERROR,		/* XfrmInStateDirError */
 	__LINUX_MIB_XFRMMAX
 };

diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index a17d783dc7c0..a3c50b00d6c1 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -279,6 +279,13 @@ int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
 		if (!x)
 			continue;

+		if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
+			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
+			xfrm_state_put(x);
+			x = NULL;
+			continue;
+		}
+
 		spin_lock(&x->lock);

 		if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 161f535c8b94..71b42de6e3c9 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -466,6 +466,11 @@ 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);
@@ -571,6 +576,12 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 			goto drop;
 		}

+		if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
+			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
+			xfrm_state_put(x);
+			goto drop;
+		}
+
 		skb->mark = xfrm_smark_get(skb->mark, x);

 		sp->xvec[sp->len++] = x;
diff --git a/net/xfrm/xfrm_proc.c b/net/xfrm/xfrm_proc.c
index 98606f1078f7..eeb984be03a7 100644
--- a/net/xfrm/xfrm_proc.c
+++ b/net/xfrm/xfrm_proc.c
@@ -42,6 +42,7 @@ static const struct snmp_mib xfrm_mib_list[] = {
 	SNMP_MIB_ITEM("XfrmOutStateInvalid", LINUX_MIB_XFRMOUTSTATEINVALID),
 	SNMP_MIB_ITEM("XfrmAcquireError", LINUX_MIB_XFRMACQUIREERROR),
 	SNMP_MIB_ITEM("XfrmOutStateDirError", LINUX_MIB_XFRMOUTSTATEDIRERROR),
+	SNMP_MIB_ITEM("XfrmInStateDirError", LINUX_MIB_XFRMINSTATEDIRERROR),
 	SNMP_MIB_SENTINEL
 };

--
2.30.2