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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@mellanox.com>
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reported-by: Chris Mi <chrism@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Or Gerlitz 2018-12-09 18:10:24 +02:00 committed by David S. Miller
parent d4b60e94e9
commit 35cc3cefc4
1 changed files with 10 additions and 13 deletions
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23
net/sched/cls_flower.c
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@ -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;