diff mbox series

[net-next,05/10] netfilter: flowtable: move skb_try_make_writable() before NAT in IPv4

Message ID 20210322235628.2204-6-pablo@netfilter.org
State New
Headers show
Series Netfilter updates for net-next | expand

Commit Message

Pablo Neira Ayuso March 22, 2021, 11:56 p.m. UTC 
For consistency with the IPv6 flowtable datapath and to make sure the
skbuff is writable right before the NAT header updates.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_flow_table_ip.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 2b8ee5dcef64..95adf74515ea 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -266,10 +266,6 @@  nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 
 	iph = ip_hdr(skb);
 	thoff = iph->ihl * 4;
-	if (skb_try_make_writable(skb, thoff + hdrsize))
-		return NF_DROP;
-
-	iph = ip_hdr(skb);
 	if (nf_flow_state_check(flow, iph->protocol, skb, thoff))
 		return NF_ACCEPT;
 
@@ -280,6 +276,10 @@  nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 		return NF_ACCEPT;
 	}
 
+	if (skb_try_make_writable(skb, thoff + hdrsize))
+		return NF_DROP;
+
+	iph = ip_hdr(skb);
 	if (nf_flow_nat_ip(flow, skb, thoff, dir, iph) < 0)
 		return NF_DROP;