netdev - [PATCH net-next 3/7] ipv4: Convert __mkroute_input() to dscp

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Message-ID: <40853c720aee4d608e6b1b204982164c3b76697d.1728302212.git.gnault@redhat.com>
Date: Mon, 7 Oct 2024 20:24:42 +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, David Ahern <dsahern@...nel.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: [PATCH net-next 3/7] ipv4: Convert __mkroute_input() to dscp_t.

Pass a dscp_t variable to __mkroute_input(), instead of a plain u8, to
prevent accidental setting of ECN bits in ->flowi4_tos.

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

While there, reorganise the function parameters to fill up horizontal
space.

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 net/ipv4/route.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 38bb38dbe490..763b8bafd1bf 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1764,10 +1764,9 @@ static void ip_handle_martian_source(struct net_device *dev,
 }
 
 /* called in rcu_read_lock() section */
-static int __mkroute_input(struct sk_buff *skb,
-			   const struct fib_result *res,
-			   struct in_device *in_dev,
-			   __be32 daddr, __be32 saddr, u32 tos)
+static int __mkroute_input(struct sk_buff *skb, const struct fib_result *res,
+			   struct in_device *in_dev, __be32 daddr,
+			   __be32 saddr, dscp_t dscp)
 {
 	struct fib_nh_common *nhc = FIB_RES_NHC(*res);
 	struct net_device *dev = nhc->nhc_dev;
@@ -1785,8 +1784,8 @@ static int __mkroute_input(struct sk_buff *skb,
 		return -EINVAL;
 	}
 
-	err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res),
-				  in_dev->dev, in_dev, &itag);
+	err = fib_validate_source(skb, saddr, daddr, inet_dscp_to_dsfield(dscp),
+				  FIB_RES_OIF(*res), in_dev->dev, in_dev, &itag);
 	if (err < 0) {
 		ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr,
 					 saddr);
@@ -2126,8 +2125,7 @@ static int ip_mkroute_input(struct sk_buff *skb, struct fib_result *res,
 #endif
 
 	/* create a routing cache entry */
-	return __mkroute_input(skb, res, in_dev, daddr, saddr,
-			       inet_dscp_to_dsfield(dscp));
+	return __mkroute_input(skb, res, in_dev, daddr, saddr, dscp);
 }
 
 /* Implements all the saddr-related checks as ip_route_input_slow(),
-- 
2.39.2