sch_htb: let skb->priority refer to non-leaf class

If the class in skb->priority is not a leaf, apply filters from the
selected class, not the qdisc. This lets netfilter or user space
partially classify the packet.

Signed-off-by: Harry Mason <harry.mason@smoothwall.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 0db5a6eae87f..722e137df244 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -219,11 +219,16 @@ static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch,
         if (skb->priority == sch->handle)
                 return HTB_DIRECT;      /* X:0 (direct flow) selected */
         cl = htb_find(skb->priority, sch);
-        if (cl && cl->level == 0)
-                return cl;
+        if (cl) {
+                if (cl->level == 0)
+                        return cl;
+                /* Start with inner filter chain if a non-leaf class is selected */
+                tcf = cl->filter_list;
+        } else {
+                tcf = q->filter_list;
+        }
 
         *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
-        tcf = q->filter_list;
         while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
 #ifdef CONFIG_NET_CLS_ACT
                 switch (result) {