bsd/netinet/tcp_output.c

478 	 * snd_nxt.  There may be SACK information that allows us to avoid
479 	 * resending already delivered data.  Adjust snd_nxt accordingly.
481 	if (SACK_ENABLED(tp) && SEQ_LT(tp->snd_nxt, tp->snd_max))
484 	off = tp->snd_nxt - tp->snd_una;
601 	 * If snd_nxt == snd_max and we have transmitted a FIN, the
605 	 * acks after fast-retransmit because TCP will reset snd_nxt
608 	 * In the normal retransmit-FIN-only case, however, snd_nxt will
638 					(tp->snd_nxt - tp->sack_newdata) -
654 	if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
716 		 * cancel pending retransmit, pull snd_nxt back
726 			tp->snd_nxt = tp->snd_una;
748 				(tp->snd_nxt - tp->snd_una))) {
851 		if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + so->so_snd.sb_cc))
898 		if (SEQ_LT(tp->snd_nxt, tp->snd_max))
997 	    (!(tp->t_flags & TF_SENTFIN) || tp->snd_nxt == tp->snd_una))
1098 		tp->snd_nxt = tp->iss;
1197 		!SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
1434 		else if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
1632 			!SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
1645 			!SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
1656 	    tp->snd_nxt == tp->snd_max)
1657 		tp->snd_nxt--;
1659 	 * If we are doing retransmissions, then snd_nxt will
1664 	 * (and no SYN or FIN), use snd_max instead of snd_nxt
1667 	 * right edge of the window, so use snd_nxt in that
1673 			th->th_seq = htonl(tp->snd_nxt);
1734 	if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
1735 		th->th_urp = htons((u_short)(tp->snd_up - tp->snd_nxt));
1796 		tcp_seq startseq = tp->snd_nxt;
1799 		 * Advance snd_nxt over sequence space of this segment.
1803 				tp->snd_nxt++;
1806 				tp->snd_nxt++;
1812 		tp->snd_nxt += len;
1813 		if (SEQ_GT(tp->snd_nxt, tp->snd_max)) {
1814 			tp->snd_max = tp->snd_nxt;
1836 		    ((sack_rxmit && tp->snd_nxt != tp->snd_max) ||
1837 			tp->snd_nxt != tp->snd_una ||
1850 		 * persist mode (no window) we do not update snd_nxt.
1860 		if (SEQ_GT(tp->snd_nxt + xlen, tp->snd_max))
1861 			tp->snd_max = tp->snd_nxt + len;
2098 					if (SEQ_GT((tp->snd_nxt - lost),
2100 						tp->snd_nxt -= lost;
2102 						tp->snd_nxt = tp->snd_una;