sys/netinet/tcp_sack.c

129 SYSCTL_NODE(_net_inet_tcp, OID_AUTO, sack, CTLFLAG_RW, 0, "TCP SACK");
188 			/* pkt left to sack blk */
192 			/* pkt right to sack blk */
400 	 * are in our queue of sack blocks.
538  * 0 otherwise. Note: We treat (snd_una, th_ack) as a sack block so any changes
546 	struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1], *sblkp;
569 			    &sack, sizeof(sack));
570 			sack.start = ntohl(sack.start);
571 			sack.end = ntohl(sack.end);
572 			if (SEQ_GT(sack.end, sack.start) &&
573 			    SEQ_GT(sack.start, tp->snd_una) &&
574 			    SEQ_GT(sack.start, th_ack) &&
575 			    SEQ_LT(sack.start, tp->snd_max) &&
576 			    SEQ_GT(sack.end, tp->snd_una) &&
577 			    SEQ_LEQ(sack.end, tp->snd_max)) {
578 				sack_blocks[num_sack_blks++] = sack;
580 				    (sack.end-sack.start);
599 				sack = sack_blocks[i];
601 				sack_blocks[j] = sack;
609 		 * (from the sack blocks received) are created later below
638 			/* Go to the previous sack block. */
644 			 * sack block.  Skip over all the sack blocks that
647 			 * remaining sack blocks.  This also trims the
664 	 * Since the incoming sack blocks are sorted, we can process them
671 			 * previous sack block.
696 				 * The sack block may ack all or part of the
735 		 * we're done with the sack block or the sack hole.
765  * Partial ack handling within a sack recovery episode.  Keeping this very
770  * the midst of sack recovery.