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xt_TEE: avoid making original packet writable

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There is not any real need to make the original packet writable, as it
is not going to be modified anyway.
This commit is contained in:
Jan Engelhardt
2010-03-26 23:28:13 +01:00
parent 937571bb9d
commit fd19a40dbe
1 changed files with 9 additions and 15 deletions
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24
extensions/xt_TEE.c
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@@ -157,11 +157,15 @@ tee_tg4(struct sk_buff **pskb, const struct xt_target_param *par)
return NF_DROP;
}
#endif
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
return NF_DROP;
skb = *pskb;
/*
* Copy the skb, and route the copy. Will later return %XT_CONTINUE for
* the original skb, which should continue on its way as if nothing has
* happened. The copy should be independently delivered to the TEE
* --gateway.
*/
skb = skb_copy(skb, GFP_ATOMIC);
if (skb == NULL)
return XT_CONTINUE;
/*
* If we are in PREROUTING/INPUT, the checksum must be recalculated
* since the length could have changed as a result of defragmentation.
@@ -176,16 +180,6 @@ tee_tg4(struct sk_buff **pskb, const struct xt_target_param *par)
--iph->ttl;
ip_send_check(iph);
}
/*
* Copy the skb, and route the copy. Will later return %XT_CONTINUE for
* the original skb, which should continue on its way as if nothing has
* happened. The copy should be independently delivered to the TEE
* --gateway.
*/
skb = skb_copy(skb, GFP_ATOMIC);
if (skb == NULL)
return XT_CONTINUE;
#ifdef WITH_CONNTRACK
/*
* Tell conntrack to forget this packet since it may get confused