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diff -pruN ../pristine-linux-2.6.16-rc5/net/ipv4/netfilter/ip_nat_proto_tcp.c ./net/ipv4/netfilter/ip_nat_proto_tcp.c
--- ../pristine-linux-2.6.16-rc5/net/ipv4/netfilter/ip_nat_proto_tcp.c 2006-02-27 15:47:38.000000000 +0000
+++ ./net/ipv4/netfilter/ip_nat_proto_tcp.c 2006-02-27 15:55:25.000000000 +0000
@@ -129,10 +129,14 @@ tcp_manip_pkt(struct sk_buff **pskb,
if (hdrsize < sizeof(*hdr))
return 1;
- hdr->check = ip_nat_cheat_check(~oldip, newip,
+ if ((*pskb)->proto_csum_blank) {
+ hdr->check = ip_nat_cheat_check(oldip, ~newip, hdr->check);
+ } else {
+ hdr->check = ip_nat_cheat_check(~oldip, newip,
ip_nat_cheat_check(oldport ^ 0xFFFF,
newport,
hdr->check));
+ }
return 1;
}
diff -pruN ../pristine-linux-2.6.16-rc5/net/ipv4/netfilter/ip_nat_proto_udp.c ./net/ipv4/netfilter/ip_nat_proto_udp.c
--- ../pristine-linux-2.6.16-rc5/net/ipv4/netfilter/ip_nat_proto_udp.c 2006-02-27 15:47:38.000000000 +0000
+++ ./net/ipv4/netfilter/ip_nat_proto_udp.c 2006-02-27 15:55:25.000000000 +0000
@@ -113,11 +113,16 @@ udp_manip_pkt(struct sk_buff **pskb,
newport = tuple->dst.u.udp.port;
portptr = &hdr->dest;
}
- if (hdr->check) /* 0 is a special case meaning no checksum */
- hdr->check = ip_nat_cheat_check(~oldip, newip,
+ if (hdr->check) { /* 0 is a special case meaning no checksum */
+ if ((*pskb)->proto_csum_blank) {
+ hdr->check = ip_nat_cheat_check(oldip, ~newip, hdr->check);
+ } else {
+ hdr->check = ip_nat_cheat_check(~oldip, newip,
ip_nat_cheat_check(*portptr ^ 0xFFFF,
newport,
hdr->check));
+ }
+ }
*portptr = newport;
return 1;
}
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