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netfilter: nf_nat: remove obsolete check in nf_nat_mangle_udp_packet() 

The packet size check originates from a time when UDP helpers could
accidentally mangle incorrect packets (NEWNAT) and is unnecessary
nowadays since the conntrack helpers invoke the NAT helpers for the
proper packet directly.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2011-12-23 14:01:26 +01:00 committed by Pablo Neira Ayuso
parent 40cfb706cd
commit 0af051baa8
1 changed files with 0 additions and 6 deletions
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6
net/ipv4/netfilter/nf_nat_helper.c
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@ -253,12 +253,6 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
struct udphdr *udph;
int datalen, oldlen;
/* UDP helpers might accidentally mangle the wrong packet */
iph = ip_hdr(skb);
if (skb->len < iph->ihl*4 + sizeof(*udph) +
match_offset + match_len)
return 0;
if (!skb_make_writable(skb, skb->len))
return 0;