net/ipv4/tcp_input.c

4922 	struct sk_buff *skb1;
4986 		skb1 = rb_to_skb(parent);
4987 		if (before(seq, TCP_SKB_CB(skb1)->seq)) {
4991 		if (before(seq, TCP_SKB_CB(skb1)->end_seq)) {
4992 			if (!after(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
5002 			if (after(seq, TCP_SKB_CB(skb1)->seq)) {
5004 				tcp_dsack_set(sk, seq, TCP_SKB_CB(skb1)->end_seq);
5006 				/* skb's seq == skb1's seq and skb covers skb1.
5007 				 * Replace skb1 with skb.
5009 				rb_replace_node(&skb1->rbnode, &skb->rbnode,
5012 						 TCP_SKB_CB(skb1)->seq,
5013 						 TCP_SKB_CB(skb1)->end_seq);
5016 				tcp_drop_reason(sk, skb1,
5020 		} else if (tcp_ooo_try_coalesce(sk, skb1,
5033 	while ((skb1 = skb_rb_next(skb)) != NULL) {
5034 		if (!after(end_seq, TCP_SKB_CB(skb1)->seq))
5036 		if (before(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
5037 			tcp_dsack_extend(sk, TCP_SKB_CB(skb1)->seq,
5041 		rb_erase(&skb1->rbnode, &tp->out_of_order_queue);
5042 		tcp_dsack_extend(sk, TCP_SKB_CB(skb1)->seq,
5043 				 TCP_SKB_CB(skb1)->end_seq);
5045 		tcp_drop_reason(sk, skb1, SKB_DROP_REASON_TCP_OFOMERGE);
5048 	if (!skb1)
5305 	struct sk_buff *skb1;
5309 		skb1 = rb_to_skb(parent);
5310 		if (before(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb1)->seq))