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authorStephen Hemminger <shemminger@vyatta.com>2008-01-21 02:23:49 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:08:40 -0800
commit4c30719f4f550d9b3034d9c00da9cb7fb99e6c0b (patch)
treedb487b4ae184e7e6b90e2623c371f8a09edec830 /net/sched
parent5b0ac72bc5fdda9634fb07db4cb0237fa9b6df68 (diff)
[PKT_SCHED] dsmark: handle cloned and non-linear skb's
Make dsmark work properly with non-linear and cloned skb's Before modifying the header, it needs to check that skb header is writeable. Note: this makes the assumption, that if it queues a good skb then a good skb will come out of the embedded qdisc. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_dsmark.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index d96eaf0aa6b..ad30b7b4769 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -187,13 +187,19 @@ static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
if (p->set_tc_index) {
- /* FIXME: Safe with non-linear skbs? --RR */
switch (skb->protocol) {
case __constant_htons(ETH_P_IP):
+ if (skb_cow_head(skb, sizeof(struct iphdr)))
+ goto drop;
+
skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
& ~INET_ECN_MASK;
break;
+
case __constant_htons(ETH_P_IPV6):
+ if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
& ~INET_ECN_MASK;
break;
@@ -217,14 +223,14 @@ static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
case TC_ACT_STOLEN:
kfree_skb(skb);
return NET_XMIT_SUCCESS;
+
case TC_ACT_SHOT:
- kfree_skb(skb);
- sch->qstats.drops++;
- return NET_XMIT_BYPASS;
+ goto drop;
#endif
case TC_ACT_OK:
skb->tc_index = TC_H_MIN(res.classid);
break;
+
default:
if (p->default_index != NO_DEFAULT_INDEX)
skb->tc_index = p->default_index;
@@ -243,6 +249,11 @@ static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
sch->q.qlen++;
return NET_XMIT_SUCCESS;
+
+drop:
+ kfree_skb(skb);
+ sch->qstats.drops++;
+ return NET_XMIT_BYPASS;
}
static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)