netdev - [PATCH net-next 03/12] bpf: lwtunnel: Unmask upper DSCP bits in bpf_lwt_xmit

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Message-ID: <20240905165140.3105140-4-idosch@nvidia.com>
Date: Thu, 5 Sep 2024 19:51:31 +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 03/12] bpf: lwtunnel: Unmask upper DSCP bits in bpf_lwt_xmit_reroute()

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/core/lwt_bpf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index afb05f58b64c..1a14f915b7a4 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -12,6 +12,7 @@
 #include <net/gre.h>
 #include <net/ip6_route.h>
 #include <net/ipv6_stubs.h>
+#include <net/inet_dscp.h>
 
 struct bpf_lwt_prog {
 	struct bpf_prog *prog;
@@ -205,7 +206,7 @@ static int bpf_lwt_xmit_reroute(struct sk_buff *skb)
 		fl4.flowi4_oif = oif;
 		fl4.flowi4_mark = skb->mark;
 		fl4.flowi4_uid = sock_net_uid(net, sk);
-		fl4.flowi4_tos = RT_TOS(iph->tos);
+		fl4.flowi4_tos = iph->tos & INET_DSCP_MASK;
 		fl4.flowi4_flags = FLOWI_FLAG_ANYSRC;
 		fl4.flowi4_proto = iph->protocol;
 		fl4.daddr = iph->daddr;
-- 
2.46.0