netdev - [PATCH net-next 3/6] xfrm: Convert xfrm_dst_lookup() to dscp

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Message-ID: <4c397061eb9f054cdcc3f5e60716b77c6b7912ad.1728982714.git.gnault@redhat.com>
Date: Tue, 15 Oct 2024 11:11:31 +0200
From: Guillaume Nault <gnault@...hat.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Ahern <dsahern@...nel.org>, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 3/6] xfrm: Convert xfrm_dst_lookup() to dscp_t.

Pass a dscp_t variable to xfrm_dst_lookup(), instead of an int, to
prevent accidental setting of ECN bits in ->flowi4_tos.

Only xfrm_bundle_create() actually calls xfrm_dst_lookup(). Since it
already has a dscp_t variable to pass as parameter, we only need to
remove the inet_dscp_to_dsfield() conversion.

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 net/xfrm/xfrm_policy.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index c6ea3ca69e95..6e30b110accf 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -291,7 +291,7 @@ struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
 EXPORT_SYMBOL(__xfrm_dst_lookup);
 
 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
-						int tos, int oif,
+						dscp_t dscp, int oif,
 						xfrm_address_t *prev_saddr,
 						xfrm_address_t *prev_daddr,
 						int family, u32 mark)
@@ -310,7 +310,8 @@ static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
 		daddr = x->coaddr;
 	}
 
-	dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark);
+	dst = __xfrm_dst_lookup(net, inet_dscp_to_dsfield(dscp), oif, saddr,
+				daddr, family, mark);
 
 	if (!IS_ERR(dst)) {
 		if (prev_saddr != saddr)
@@ -2695,9 +2696,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 				family = xfrm[i]->props.family;
 
 			oif = fl->flowi_oif ? : fl->flowi_l3mdev;
-			dst = xfrm_dst_lookup(xfrm[i],
-					      inet_dscp_to_dsfield(dscp), oif,
-					      &saddr, &daddr, family, mark);
+			dst = xfrm_dst_lookup(xfrm[i], dscp, oif, &saddr,
+					      &daddr, family, mark);
 			err = PTR_ERR(dst);
 			if (IS_ERR(dst))
 				goto put_states;
-- 
2.39.2