netdev - [PATCH net] net: sched: Fix dump of MPLS_OPT_LSE_LABEL attribute in cls

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Message-ID: <0e248b0464673b412d428666d10b6d3c208809bf.1607528860.git.gnault@redhat.com>
Date:   Wed, 9 Dec 2020 16:48:41 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net] net: sched: Fix dump of MPLS_OPT_LSE_LABEL attribute in
 cls_flower

TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL is a u32 attribute (MPLS label is
20 bits long).

Fixes the following bug:

 $ tc filter add dev ethX ingress protocol mpls_uc \
     flower mpls lse depth 2 label 256             \
     action drop

 $ tc filter show dev ethX ingress
   filter protocol mpls_uc pref 49152 flower chain 0
   filter protocol mpls_uc pref 49152 flower chain 0 handle 0x1
     eth_type 8847
     mpls
       lse depth 2 label 0  <-- invalid label 0, should be 256
   ...

Fixes: 61aec25a6db5 ("cls_flower: Support filtering on multiple MPLS Label Stack Entries")
Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 net/sched/cls_flower.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index fed18fd2c50b..1319986693fc 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -2424,8 +2424,8 @@ static int fl_dump_key_mpls_opt_lse(struct sk_buff *skb,
 			return err;
 	}
 	if (lse_mask->mpls_label) {
-		err = nla_put_u8(skb, TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL,
-				 lse_key->mpls_label);
+		err = nla_put_u32(skb, TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL,
+				  lse_key->mpls_label);
 		if (err)
 			return err;
 	}
-- 
2.21.3