- if (skb->h.th->doff > 5) {
- tcp_opt_len = (skb->h.th->doff - 5) << 2;
- }
- ip_tcp_len = (skb->nh.iph->ihl << 2) + sizeof(struct tcphdr);
-
- skb->nh.iph->check = 0;
- skb->nh.iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
- skb->h.th->check =
- ~csum_tcpudp_magic(skb->nh.iph->saddr,
- skb->nh.iph->daddr,
- 0, IPPROTO_TCP, 0);
-
- if (tcp_opt_len || (skb->nh.iph->ihl > 5)) {
- vlan_tag_flags |= ((skb->nh.iph->ihl - 5) +
- (tcp_opt_len >> 2)) << 8;
+ if (tcp_hdr(skb)->doff > 5)
+ tcp_opt_len = tcp_optlen(skb);
+
+ ip_tcp_len = ip_hdrlen(skb) + sizeof(struct tcphdr);
+
+ iph = ip_hdr(skb);
+ iph->check = 0;
+ iph->tot_len = htons(mss + ip_tcp_len + tcp_opt_len);
+ tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
+ iph->daddr, 0,
+ IPPROTO_TCP, 0);
+ if (tcp_opt_len || (iph->ihl > 5)) {
+ vlan_tag_flags |= ((iph->ihl - 5) +
+ (tcp_opt_len >> 2)) << 8;