[NET_SCHED]: Fix prio/ingress classification logic error

[Patrick McHardy]

This is the final fix for the problem Peter reported.
Turns out most other schedulers get it right, the only
other case is ingress setting skb->tc_index to the
uninitialized value of res.classid.



[NET_SCHED]: Fix prio/ingress classification logic error

Fix handling of empty or completely non-matching filter chains. In
that case -1 is returned and tcf_result is uninitialized, the
qdisc should fall back to default classification in that case.

Noticed by PJ Waskiewicz <[EMAIL PROTECTED]>.

Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>

---
commit c98436c161ff45850346b08f89cfb444be7c7817
tree 07e3ea0f508243f41e70645b6c358e23244ea0b4
parent e4903fb59590f86190280a549420f6cb85bd7f7e
author Patrick McHardy <[EMAIL PROTECTED]> Thu, 26 Jul 2007 13:32:26 +0200
committer Patrick McHardy <[EMAIL PROTECTED]> Thu, 26 Jul 2007 13:32:26 +0200

 net/sched/sch_ingress.c |    3 +--
 net/sched/sch_prio.c    |    7 +++----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 51f16b0..2d32fd2 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -158,9 +158,8 @@ static int ingress_enqueue(struct sk_buff *skb,struct Qdisc 
*sch)
                        break;
                case TC_ACT_RECLASSIFY:
                case TC_ACT_OK:
-               case TC_ACT_UNSPEC:
-               default:
                        skb->tc_index = TC_H_MIN(res.classid);
+               default:
                        result = TC_ACT_OK;
                        break;
        }
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 2d8c084..71bafde 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -38,9 +38,11 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int 
*qerr)
        struct prio_sched_data *q = qdisc_priv(sch);
        u32 band = skb->priority;
        struct tcf_result res;
+       int err;
 
        *qerr = NET_XMIT_BYPASS;
        if (TC_H_MAJ(skb->priority) != sch->handle) {
+               err = tc_classify(skb, q->filter_list, &res);
 #ifdef CONFIG_NET_CLS_ACT
                switch (tc_classify(skb, q->filter_list, &res)) {
                case TC_ACT_STOLEN:
@@ -49,11 +51,8 @@ prio_classify(struct sk_buff *skb, struct Qdisc *sch, int 
*qerr)
                case TC_ACT_SHOT:
                        return NULL;
                }
-
-               if (!q->filter_list ) {
-#else
-               if (!q->filter_list || tc_classify(skb, q->filter_list, &res)) {
 #endif
+               if (!q->filter_list || err < 0) {
                        if (TC_H_MAJ(band))
                                band = 0;
                        band = q->prio2band[band&TC_PRIO_MAX];