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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/bridge
parentaf1e1cf073e3d038b7aac417a20585ecdcab7de6 (diff)
downloadlinux-2ca7b0ac022aa0158599178fe1056b1ba9ec8b97.tar.bz2
[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/bridge')
-rw-r--r--net/bridge/netfilter/ebt_dnat.c13
-rw-r--r--net/bridge/netfilter/ebt_redirect.c13
-rw-r--r--net/bridge/netfilter/ebt_snat.c13
3 files changed, 9 insertions, 30 deletions
diff --git a/net/bridge/netfilter/ebt_dnat.c b/net/bridge/netfilter/ebt_dnat.c
index 4582659dff0e..9d74dee20ab0 100644
--- a/net/bridge/netfilter/ebt_dnat.c
+++ b/net/bridge/netfilter/ebt_dnat.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/netfilter.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_nat.h>
#include <linux/module.h>
@@ -19,17 +20,9 @@ static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
{
struct ebt_nat_info *info = (struct ebt_nat_info *)data;
- if (skb_shared(*pskb) || skb_cloned(*pskb)) {
- struct sk_buff *nskb;
+ if (skb_make_writable(*pskb, 0))
+ return NF_DROP;
- nskb = skb_copy(*pskb, GFP_ATOMIC);
- if (!nskb)
- return NF_DROP;
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
- }
memcpy(eth_hdr(*pskb)->h_dest, info->mac, ETH_ALEN);
return info->target;
}
diff --git a/net/bridge/netfilter/ebt_redirect.c b/net/bridge/netfilter/ebt_redirect.c
index 9f378eab72d0..81371cd01bd0 100644
--- a/net/bridge/netfilter/ebt_redirect.c
+++ b/net/bridge/netfilter/ebt_redirect.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/netfilter.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_redirect.h>
#include <linux/module.h>
@@ -20,17 +21,9 @@ static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
{
struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
- if (skb_shared(*pskb) || skb_cloned(*pskb)) {
- struct sk_buff *nskb;
+ if (skb_make_writable(*pskb, 0))
+ return NF_DROP;
- nskb = skb_copy(*pskb, GFP_ATOMIC);
- if (!nskb)
- return NF_DROP;
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
- }
if (hooknr != NF_BR_BROUTING)
memcpy(eth_hdr(*pskb)->h_dest,
in->br_port->br->dev->dev_addr, ETH_ALEN);
diff --git a/net/bridge/netfilter/ebt_snat.c b/net/bridge/netfilter/ebt_snat.c
index a50722182bfe..b0c63684e2f5 100644
--- a/net/bridge/netfilter/ebt_snat.c
+++ b/net/bridge/netfilter/ebt_snat.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/netfilter.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_nat.h>
#include <linux/module.h>
@@ -21,17 +22,9 @@ static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
{
struct ebt_nat_info *info = (struct ebt_nat_info *) data;
- if (skb_shared(*pskb) || skb_cloned(*pskb)) {
- struct sk_buff *nskb;
+ if (skb_make_writable(*pskb, 0))
+ return NF_DROP;
- nskb = skb_copy(*pskb, GFP_ATOMIC);
- if (!nskb)
- return NF_DROP;
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
- }
memcpy(eth_hdr(*pskb)->h_source, info->mac, ETH_ALEN);
if (!(info->target & NAT_ARP_BIT) &&
eth_hdr(*pskb)->h_proto == htons(ETH_P_ARP)) {