418 	unsigned hlen = basehlen + sizeof(struct tcphdr);  in tcp_init_common()  local
421 	if (max_linkhdr + hlen > MHLEN)  in tcp_init_common()
423 	while ((oldhlen = max_protohdr) < hlen)  in tcp_init_common()
424 		atomic_cas_uint(&max_protohdr, oldhlen, hlen);  in tcp_init_common()
453 	int hlen;  in tcp_template()  local
457 		hlen = sizeof(struct ip);  in tcp_template()
471 		hlen = sizeof(struct ip6_hdr);  in tcp_template()
482 	KASSERT(hlen + sizeof(struct tcphdr) <= MCLBYTES);  in tcp_template()
485 	if (m && m->m_len == hlen + sizeof(struct tcphdr)) {  in tcp_template()
491 		if (m && hlen + sizeof(struct tcphdr) > MHLEN) {  in tcp_template()
501 		m->m_pkthdr.len = m->m_len = hlen + sizeof(struct tcphdr);  in tcp_template()
506 	n = (struct tcphdr *)(mtod(m, char *) + hlen);  in tcp_template()
513 		mtod(m, struct ip *)->ip_hl = hlen >> 2;  in tcp_template()
609 	int hlen;  in tcp_respond()  local
636 			hlen = sizeof(struct ip);  in tcp_respond()
641 			hlen = sizeof(struct ip6_hdr);  in tcp_respond()
689 			hlen = sizeof(struct ip);  in tcp_respond()
695 			hlen = sizeof(struct ip6_hdr);  in tcp_respond()
711 		if (m->m_len > hlen + tlen && (m->m_flags & M_EXT) == 0 &&  in tcp_respond()
712 		    mtod(m, char *) + hlen == (char *)th0) {  in tcp_respond()
713 			m->m_len = hlen + tlen;  in tcp_respond()
719 			KASSERT(max_linkhdr + hlen + tlen <= MCLBYTES);  in tcp_respond()
722 			if (n && max_linkhdr + hlen + tlen > MHLEN) {  in tcp_respond()
736 			n->m_len = hlen + tlen;  in tcp_respond()
737 			m_copyback(n, 0, hlen, mtod(m, void *));  in tcp_respond()
738 			m_copyback(n, hlen, tlen, (void *)th0);  in tcp_respond()
782 	m->m_len = hlen + tlen;  in tcp_respond()
783 	m->m_pkthdr.len = hlen + tlen;  in tcp_respond()
796 		th->th_sum = in_cksum(m, hlen + tlen);  in tcp_respond()
797 		ip->ip_len = htons(hlen + tlen);  in tcp_respond()
2149 	u_int hlen;  in tcp_hdrsz()  local
2154 		hlen = sizeof(struct ip6_hdr);  in tcp_hdrsz()
2158 		hlen = sizeof(struct ip);  in tcp_hdrsz()
2161 		hlen = 0;  in tcp_hdrsz()
2164 	hlen += sizeof(struct tcphdr);  in tcp_hdrsz()
2168 		hlen += TCPOLEN_TSTAMP_APPA;  in tcp_hdrsz()
2171 		hlen += TCPOLEN_SIGLEN;  in tcp_hdrsz()
2173 	return hlen;  in tcp_hdrsz()