- tcph->check = 0;
- tcph->check = tcp_v4_check(tcph, datalen, iph->saddr, iph->daddr,
- csum_partial((char *)tcph, datalen, 0));
+ if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ tcph->check = 0;
+ tcph->check = tcp_v4_check(tcph, datalen,
+ iph->saddr, iph->daddr,
+ csum_partial((char *)tcph,
+ datalen, 0));
+ } else
+ nf_proto_csum_replace2(&tcph->check, *pskb,
+ htons(oldlen), htons(datalen), 1);