netdev - [PATCH RFC net] net/sched: cls_flower: Reject duplicated rules also under skip

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Date:   Mon,  3 Dec 2018 13:20:01 +0200
From:   Or Gerlitz <ogerlitz@...lanox.com>
To:     Jiri Pirko <jiri@...lanox.com>
Cc:     netdev@...r.kernel.org, Chris Mi <chrism@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Paul Blakey <paulb@...lanox.com>
Subject: [PATCH RFC net] net/sched: cls_flower: Reject duplicated rules also under skip_sw

Currently, duplicated rules are rejected only for skip_hw or "none",
hence allowing users to push duplicated into HW for no reason.

Use the flower tables to protect for that.

Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Paul Blakey <paulb@...lanox.com>
Reported-by: Chris Mi <chrism@...lanox.com>
---
 net/sched/cls_flower.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index c6c327874abc..3868e5e73acf 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1238,18 +1238,16 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	if (err)
 		goto errout_idr;
 
-	if (!tc_skip_sw(fnew->flags)) {
-		if (!fold && fl_lookup(fnew->mask, &fnew->mkey)) {
-			err = -EEXIST;
-			goto errout_mask;
-		}
-
-		err = rhashtable_insert_fast(&fnew->mask->ht, &fnew->ht_node,
-					     fnew->mask->filter_ht_params);
-		if (err)
-			goto errout_mask;
+	if (!fold && fl_lookup(fnew->mask, &fnew->mkey)) {
+		err = -EEXIST;
+		goto errout_mask;
 	}
 
+	err = rhashtable_insert_fast(&fnew->mask->ht, &fnew->ht_node,
+				     fnew->mask->filter_ht_params);
+	if (err)
+		goto errout_mask;
+
 	if (!tc_skip_hw(fnew->flags)) {
 		err = fl_hw_replace_filter(tp, fnew, extack);
 		if (err)
-- 
2.17.0.2884.g4ede3d4