From: Changli Gao <xiaosuo@gmail.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jamal Hadi Salim <hadi@cyberus.ca>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, Changli Gao <xiaosuo@gmail.com>
Subject: [PATCH] act_nat: fix on the TX path
Date: Wed, 4 Aug 2010 11:39:18 +0800 [thread overview]
Message-ID: <1280893158-22103-1-git-send-email-xiaosuo@gmail.com> (raw)
On the TX path, skb->data points to the ethernet header, not the network
header. So when validating the packet length for accessing we should
take the ethernet header into account.
Signed-off-by: Changli Gao <xiaosuo@gmail.com>
---
net/sched/act_nat.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index d0386a4..509a2d5 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -114,6 +114,7 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
int egress;
int action;
int ihl;
+ int noff;
spin_lock(&p->tcf_lock);
@@ -132,7 +133,8 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
if (unlikely(action == TC_ACT_SHOT))
goto drop;
- if (!pskb_may_pull(skb, sizeof(*iph)))
+ noff = skb_network_offset(skb);
+ if (!pskb_may_pull(skb, sizeof(*iph) + noff))
goto drop;
iph = ip_hdr(skb);
@@ -144,7 +146,7 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
if (!((old_addr ^ addr) & mask)) {
if (skb_cloned(skb) &&
- !skb_clone_writable(skb, sizeof(*iph)) &&
+ !skb_clone_writable(skb, sizeof(*iph) + noff) &&
pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
goto drop;
@@ -172,9 +174,9 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
{
struct tcphdr *tcph;
- if (!pskb_may_pull(skb, ihl + sizeof(*tcph)) ||
+ if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) ||
(skb_cloned(skb) &&
- !skb_clone_writable(skb, ihl + sizeof(*tcph)) &&
+ !skb_clone_writable(skb, ihl + sizeof(*tcph) + noff) &&
pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
goto drop;
@@ -186,9 +188,9 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
{
struct udphdr *udph;
- if (!pskb_may_pull(skb, ihl + sizeof(*udph)) ||
+ if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) ||
(skb_cloned(skb) &&
- !skb_clone_writable(skb, ihl + sizeof(*udph)) &&
+ !skb_clone_writable(skb, ihl + sizeof(*udph) + noff) &&
pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
goto drop;
@@ -205,7 +207,7 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
{
struct icmphdr *icmph;
- if (!pskb_may_pull(skb, ihl + sizeof(*icmph)))
+ if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))
goto drop;
icmph = (void *)(skb_network_header(skb) + ihl);
@@ -215,7 +217,8 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
(icmph->type != ICMP_PARAMETERPROB))
break;
- if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph)))
+ if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +
+ noff))
goto drop;
icmph = (void *)(skb_network_header(skb) + ihl);
@@ -229,8 +232,8 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
break;
if (skb_cloned(skb) &&
- !skb_clone_writable(skb,
- ihl + sizeof(*icmph) + sizeof(*iph)) &&
+ !skb_clone_writable(skb, ihl + sizeof(*icmph) +
+ sizeof(*iph) + noff) &&
pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
goto drop;
next reply other threads:[~2010-08-04 3:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 3:39 Changli Gao [this message]
2010-08-04 7:06 ` [PATCH] act_nat: fix on the TX path Herbert Xu
2010-08-05 4:54 ` David Miller
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