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[NETFILTER]: Avoid skb_copy/pskb_copy/skb_realloc_headroom

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This patch replaces unnecessary uses of skb_copy, pskb_copy and
skb_realloc_headroom by functions such as skb_make_writable and
pskb_expand_head.

This allows us to remove the double pointers later.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-10-14 00:39:55 -07:00
committed by David S. Miller
parent af1e1cf073
commit 2ca7b0ac02
10 changed files with 45 additions and 117 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
net/ipv6/netfilter/ip6_queue.c
View File

@@ -332,6 +332,7 @@ static int
ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
{
int diff;
int err;
struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload;
if (v->data_len < sizeof(*user_iph))
@@ -344,21 +345,14 @@ ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
if (v->data_len > 0xFFFF)
return -EINVAL;
if (diff > skb_tailroom(e->skb)) {
struct sk_buff *newskb;
newskb = skb_copy_expand(e->skb,
skb_headroom(e->skb),
diff,
GFP_ATOMIC);
if (newskb == NULL) {
err = pskb_expand_head(e->skb, 0,
diff - skb_tailroom(e->skb),
GFP_ATOMIC);
if (err) {
printk(KERN_WARNING "ip6_queue: OOM "
"in mangle, dropping packet\n");
return -ENOMEM;
return err;
}
if (e->skb->sk)
skb_set_owner_w(newskb, e->skb->sk);
kfree_skb(e->skb);
e->skb = newskb;
}
skb_put(e->skb, diff);
}