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

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Message-Id: <1544371824-30368-1-git-send-email-ogerlitz@mellanox.com>
Date:   Sun,  9 Dec 2018 18:10:24 +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>,
        Paul Blakey <paulb@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH 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 duplicates 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>
---
changes from RFC:
 - properly handle delete as well

 net/sched/cls_flower.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index c6c327874abc..71312d7bd8f4 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)
@@ -1303,9 +1301,8 @@ static int fl_delete(struct tcf_proto *tp, void *arg, bool *last,
 	struct cls_fl_head *head = rtnl_dereference(tp->root);
 	struct cls_fl_filter *f = arg;
 
-	if (!tc_skip_sw(f->flags))
-		rhashtable_remove_fast(&f->mask->ht, &f->ht_node,
-				       f->mask->filter_ht_params);
+	rhashtable_remove_fast(&f->mask->ht, &f->ht_node,
+			       f->mask->filter_ht_params);
 	__fl_delete(tp, f, extack);
 	*last = list_empty(&head->masks);
 	return 0;
-- 
2.17.0.2884.g4ede3d4