netdev - [PATCH net-next 04/12] ipv4: icmp: Unmask upper DSCP bits in icmp

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Message-ID: <20240905165140.3105140-5-idosch@nvidia.com>
Date: Thu, 5 Sep 2024 19:51:32 +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>, <dsahern@...nel.org>, <gnault@...hat.com>,
	<razor@...ckwall.org>, <pablo@...filter.org>, <kadlec@...filter.org>,
	<marcelo.leitner@...il.com>, <lucien.xin@...il.com>,
	<bridge@...ts.linux.dev>, <netfilter-devel@...r.kernel.org>,
	<coreteam@...filter.org>, <linux-sctp@...r.kernel.org>,
	<bpf@...r.kernel.org>, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 04/12] ipv4: icmp: Unmask upper DSCP bits in icmp_reply()

Unmask the upper DSCP bits when calling ip_route_output_key() so that in
the future it could perform the FIB lookup according to the full DSCP
value.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 net/ipv4/icmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index d2463b6e390e..e1384e7331d8 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -445,7 +445,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
 	fl4.saddr = saddr;
 	fl4.flowi4_mark = mark;
 	fl4.flowi4_uid = sock_net_uid(net, NULL);
-	fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+	fl4.flowi4_tos = ip_hdr(skb)->tos & INET_DSCP_MASK;
 	fl4.flowi4_proto = IPPROTO_ICMP;
 	fl4.flowi4_oif = l3mdev_master_ifindex(skb->dev);
 	security_skb_classify_flow(skb, flowi4_to_flowi_common(&fl4));
-- 
2.46.0