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authorHerbert Xu <herbert@gondor.apana.org.au>2007-10-14 00:39:55 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-15 12:26:28 -0700
commit2ca7b0ac022aa0158599178fe1056b1ba9ec8b97 (patch)
tree6eece25447f0ec3b5d5f5533e49e10fde4d59f35 /net/netfilter
parentaf1e1cf073e3d038b7aac417a20585ecdcab7de6 (diff)
[NETFILTER]: Avoid skb_copy/pskb_copy/skb_realloc_headroom
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>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nfnetlink_queue.c18
-rw-r--r--net/netfilter/xt_TCPMSS.c10
2 files changed, 9 insertions, 19 deletions
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 6ba98acdd7a..3ceeffcf6f9 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -617,6 +617,7 @@ static int
nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e)
{
int diff;
+ int err;
diff = data_len - e->skb->len;
if (diff < 0) {
@@ -626,21 +627,14 @@ nfqnl_mangle(void *data, int data_len, struct nfqnl_queue_entry *e)
if (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 "nf_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);
}
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c
index 31b6f9d0982..f111edf5f77 100644
--- a/net/netfilter/xt_TCPMSS.c
+++ b/net/netfilter/xt_TCPMSS.c
@@ -105,14 +105,10 @@ tcpmss_mangle_packet(struct sk_buff **pskb,
* MSS Option not found ?! add it..
*/
if (skb_tailroom((*pskb)) < TCPOLEN_MSS) {
- struct sk_buff *newskb;
-
- newskb = skb_copy_expand(*pskb, skb_headroom(*pskb),
- TCPOLEN_MSS, GFP_ATOMIC);
- if (!newskb)
+ if (pskb_expand_head(*pskb, 0,
+ TCPOLEN_MSS - skb_tailroom(*pskb),
+ GFP_ATOMIC))
return -1;
- kfree_skb(*pskb);
- *pskb = newskb;
tcph = (struct tcphdr *)(skb_network_header(*pskb) + tcphoff);
}