42 		struct tcphdr *th = tcp_hdr(skb);  in tcp4_gso_segment()  local
48 		th->check = 0;  in tcp4_gso_segment()
61 	struct tcphdr *th;  in tcp_gso_segment()  local
71 	th = tcp_hdr(skb);  in tcp_gso_segment()
72 	thlen = th->doff * 4;  in tcp_gso_segment()
73 	if (thlen < sizeof(*th))  in tcp_gso_segment()
120 	th = tcp_hdr(skb);  in tcp_gso_segment()
121 	seq = ntohl(th->seq);  in tcp_gso_segment()
126 	newcheck = ~csum_fold(csum_add(csum_unfold(th->check), delta));  in tcp_gso_segment()
129 		th->fin = th->psh = 0;  in tcp_gso_segment()
130 		th->check = newcheck;  in tcp_gso_segment()
133 			gso_reset_checksum(skb, ~th->check);  in tcp_gso_segment()
135 			th->check = gso_make_checksum(skb, ~th->check);  in tcp_gso_segment()
144 		th = tcp_hdr(skb);  in tcp_gso_segment()
146 		th->seq = htonl(seq);  in tcp_gso_segment()
147 		th->cwr = 0;  in tcp_gso_segment()
175 	th->check = ~csum_fold(csum_add(csum_unfold(th->check), delta));  in tcp_gso_segment()
177 		gso_reset_checksum(skb, ~th->check);  in tcp_gso_segment()
179 		th->check = gso_make_checksum(skb, ~th->check);  in tcp_gso_segment()
188 	struct tcphdr *th;  in tcp_gro_receive()  local
200 	hlen = off + sizeof(*th);  in tcp_gro_receive()
201 	th = skb_gro_header(skb, hlen, off);  in tcp_gro_receive()
202 	if (unlikely(!th))  in tcp_gro_receive()
205 	thlen = th->doff * 4;  in tcp_gro_receive()
206 	if (thlen < sizeof(*th))  in tcp_gro_receive()
211 		th = skb_gro_header_slow(skb, hlen, off);  in tcp_gro_receive()
212 		if (unlikely(!th))  in tcp_gro_receive()
219 	flags = tcp_flag_word(th);  in tcp_gro_receive()
227 		if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {  in tcp_gro_receive()
243 	flush |= (__force int)(th->ack_seq ^ th2->ack_seq);  in tcp_gro_receive()
244 	for (i = sizeof(*th); i < thlen; i += 4)  in tcp_gro_receive()
245 		flush |= *(u32 *)((u8 *)th + i) ^  in tcp_gro_receive()
270 	flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);  in tcp_gro_receive()
304 	struct tcphdr *th = tcp_hdr(skb);  in tcp_gro_complete()  local
306 	skb->csum_start = (unsigned char *)th - skb->head;  in tcp_gro_complete()
312 	if (th->cwr)  in tcp_gro_complete()
337 	struct tcphdr *th = tcp_hdr(skb);  in tcp4_gro_complete()  local
339 	th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,  in tcp4_gro_complete()