[PATCH 2.6.11 PKT_SCHED]: ipt action: add back pskb_expand_head call

[Patrick McHardy <kaber@xxxxxxxxx>]

Hi Dave,

Jamal asked me to add back the call to pskb_expand_head before 2.6.11.
This fixes a regression caused by my tc action cleanup patches, the
tc actions most not replace packets, so it must prevent netfilter from
doing so.

Regards
Patrick

===== net/sched/ipt.c 1.13 vs edited =====
--- 1.13/net/sched/ipt.c        2005-01-14 05:41:07 +01:00
+++ edited/net/sched/ipt.c      2005-02-04 04:06:45 +01:00
@@ -207,6 +207,11 @@
        struct tcf_ipt *p = PRIV(a, ipt);
        struct sk_buff *skb = *pskb;
 
+       if (skb_cloned(skb)) {
+               if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+                       return TC_ACT_UNSPEC;
+       }
+
        spin_lock(&p->lock);
 
        p->tm.lastuse = jiffies;