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[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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/bridge/netfilter/ebt_dnat.c
View File

@ -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;
}

13
net/bridge/netfilter/ebt_redirect.c
View File

@ -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);

13
net/bridge/netfilter/ebt_snat.c
View File

@ -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)) {

31
net/ipv4/netfilter.c
View File

@ -3,6 +3,7 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <net/route.h>
#include <net/xfrm.h>
#include <net/ip.h>
@ -66,17 +67,10 @@ int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type)
/* Change in oif may mean change in hh_len. */
hh_len = (*pskb)->dst->dev->hard_header_len;
if (skb_headroom(*pskb) < hh_len) {
struct sk_buff *nskb;
nskb = skb_realloc_headroom(*pskb, hh_len);
if (!nskb)
return -1;
if ((*pskb)->sk)
skb_set_owner_w(nskb, (*pskb)->sk);
kfree_skb(*pskb);
*pskb = nskb;
}
if (skb_headroom(*pskb) < hh_len &&
pskb_expand_head(*pskb, hh_len - skb_headroom(*pskb), 0,
GFP_ATOMIC))
return -1;
return 0;
}
@ -107,17 +101,10 @@ int ip_xfrm_me_harder(struct sk_buff **pskb)
/* Change in oif may mean change in hh_len. */
hh_len = (*pskb)->dst->dev->hard_header_len;
if (skb_headroom(*pskb) < hh_len) {
struct sk_buff *nskb;
nskb = skb_realloc_headroom(*pskb, hh_len);
if (!nskb)
return -1;
if ((*pskb)->sk)
skb_set_owner_w(nskb, (*pskb)->sk);
kfree_skb(*pskb);
*pskb = nskb;
}
if (skb_headroom(*pskb) < hh_len &&
pskb_expand_head(*pskb, hh_len - skb_headroom(*pskb), 0,
GFP_ATOMIC))
return -1;
return 0;
}
EXPORT_SYMBOL(ip_xfrm_me_harder);

14
net/ipv4/netfilter/arpt_mangle.c
View File

@ -1,5 +1,6 @@
/* module that allows mangling of the arp payload */
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/netfilter_arp/arpt_mangle.h>
#include <net/sock.h>
@ -18,17 +19,8 @@ target(struct sk_buff **pskb,
unsigned char *arpptr;
int pln, hln;
if (skb_shared(*pskb) || skb_cloned(*pskb)) {
struct sk_buff *nskb;
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 (skb_make_writable(*pskb, (*pskb)->len))
return NF_DROP;
arp = arp_hdr(*pskb);
arpptr = skb_network_header(*pskb) + sizeof(*arp);

22
net/ipv4/netfilter/ip_queue.c
View File

@ -335,6 +335,7 @@ static int
ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
{
int diff;
int err;
struct iphdr *user_iph = (struct iphdr *)v->payload;
if (v->data_len < sizeof(*user_iph))
@ -347,21 +348,14 @@ ipq_mangle_ipv4(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) {
printk(KERN_WARNING "ip_queue: OOM "
"in mangle, dropping packet\n");
return -ENOMEM;
err = pskb_expand_head(e->skb, 0,
diff - skb_tailroom(e->skb),
GFP_ATOMIC);
if (err) {
printk(KERN_WARNING "ip_queue: error "
"in mangle, dropping packet: %d\n", -err);
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);
}

10
net/ipv4/netfilter/nf_nat_helper.c
View File

@ -113,20 +113,12 @@ static void mangle_contents(struct sk_buff *skb,
/* Unusual, but possible case. */
static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
{
struct sk_buff *nskb;
if ((*pskb)->len + extra > 65535)
return 0;
nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
if (!nskb)
if (pskb_expand_head(*pskb, 0, extra - skb_tailroom(*pskb), GFP_ATOMIC))
return 0;
/* Transfer socket to new skb. */
if ((*pskb)->sk)
skb_set_owner_w(nskb, (*pskb)->sk);
kfree_skb(*pskb);
*pskb = nskb;
return 1;
}

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);
}

18
net/netfilter/nfnetlink_queue.c
View File

@ -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);
}

10
net/netfilter/xt_TCPMSS.c
View File

@ -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);
}