netdev - [PATCH net-next v2 06/12] ipv4: Unmask upper DSCP bits when building flow key

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Message-ID: <20240829065459.2273106-7-idosch@nvidia.com>
Date: Thu, 29 Aug 2024 09:54:53 +0300
From: Ido Schimmel <idosch@...dia.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<edumazet@...gle.com>, <gnault@...hat.com>, <dsahern@...nel.org>,
	<ast@...nel.org>, <daniel@...earbox.net>, <martin.lau@...ux.dev>,
	<john.fastabend@...il.com>, <steffen.klassert@...unet.com>,
	<herbert@...dor.apana.org.au>, <bpf@...r.kernel.org>, Ido Schimmel
	<idosch@...dia.com>
Subject: [PATCH net-next v2 06/12] ipv4: Unmask upper DSCP bits when building flow key

build_sk_flow_key() and __build_flow_key() are used to build an IPv4
flow key before calling one of the FIB lookup APIs.

Unmask the upper DSCP bits so that in the future the lookup could be
performed according to the full DSCP value.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 net/ipv4/route.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 5a77dc6d9c72..723ac9181558 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -512,7 +512,7 @@ static void __build_flow_key(const struct net *net, struct flowi4 *fl4,
 						    sk->sk_protocol;
 	}
 
-	flowi4_init_output(fl4, oif, mark, tos & IPTOS_RT_MASK, scope,
+	flowi4_init_output(fl4, oif, mark, tos & INET_DSCP_MASK, scope,
 			   prot, flow_flags, iph->daddr, iph->saddr, 0, 0,
 			   sock_net_uid(net, sk));
 }
@@ -541,7 +541,7 @@ static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk)
 	if (inet_opt && inet_opt->opt.srr)
 		daddr = inet_opt->opt.faddr;
 	flowi4_init_output(fl4, sk->sk_bound_dev_if, READ_ONCE(sk->sk_mark),
-			   ip_sock_rt_tos(sk) & IPTOS_RT_MASK,
+			   ip_sock_rt_tos(sk),
 			   ip_sock_rt_scope(sk),
 			   inet_test_bit(HDRINCL, sk) ?
 				IPPROTO_RAW : sk->sk_protocol,
-- 
2.46.0