42 static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn);
153 static inline int sctp_cacc_skip_3_2(struct sctp_transport *primary, __u32 tsn)  in sctp_cacc_skip_3_2()  argument
156 	    TSN_lt(tsn, primary->cacc.next_tsn_at_change))  in sctp_cacc_skip_3_2()
163  * 3) If the missing report count for TSN t is to be
168  * TSN t SHOULD NOT be incremented.
178 				 __u32 tsn)  in sctp_cacc_skip()  argument
182 	     sctp_cacc_skip_3_2(primary, tsn)))  in sctp_cacc_skip()
327 	ntsn = ntohl(nchunk->subh.data_hdr->tsn);  in sctp_insert_list()
331 		ltsn = ntohl(lchunk->subh.data_hdr->tsn);  in sctp_insert_list()
504 			 * 'TSN.Missing.Report' of all affected TSNs is set  in sctp_retransmit_mark()
618 	 * E3) Determine how many of the earliest (i.e., lowest TSN)  in __sctp_outq_flush_rtx()
968 			/* PR-SCTP C5) If a FORWARD TSN is sent, the  in sctp_outq_flush_ctrl()
1103 		pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p skb->users:%d\n",  in sctp_outq_flush_data()
1106 			 "illegal chunk", ntohl(chunk->subh.data_hdr->tsn),  in sctp_outq_flush_data()
1117 			pr_debug("%s: could not transmit tsn:0x%x, status:%d\n",  in sctp_outq_flush_data()
1118 				 __func__, ntohl(chunk->subh.data_hdr->tsn),  in sctp_outq_flush_data()
1208 	 *   within a SCTP packet in increasing order of TSN.  in sctp_outq_flush()
1255 	__u32 sack_ctsn, ctsn, tsn;  in sctp_outq_sack()  local
1313 	/* Get the highest TSN in the sack. */  in sctp_outq_sack()
1350 	/* Move the Cumulative TSN Ack Point if appropriate.  */  in sctp_outq_sack()
1375 		tsn = ntohl(tchunk->subh.data_hdr->tsn);  in sctp_outq_sack()
1376 		if (TSN_lte(tsn, ctsn)) {  in sctp_outq_sack()
1387 	 *     Cumulative TSN Ack and the Gap Ack Blocks.  in sctp_outq_sack()
1403 	pr_debug("%s: sack cumulative tsn ack:0x%x\n", __func__, sack_ctsn);  in sctp_outq_sack()
1404 	pr_debug("%s: cumulative tsn ack of assoc:%p is 0x%x, "  in sctp_outq_sack()
1426  * list and move chunks that are acked by the Cumulative TSN Ack to q->sacked.
1431  * Instead of printing 'sacked' or 'kept' for each TSN on the
1445 	__u32 tsn;  in sctp_check_transmitted()  local
1479 		tsn = ntohl(tchunk->subh.data_hdr->tsn);  in sctp_check_transmitted()
1480 		if (sctp_acked(sack, tsn)) {  in sctp_check_transmitted()
1506 				if (TSN_lte(tsn, sack_ctsn)) {  in sctp_check_transmitted()
1514 					 * B) For each TSN t being acked that  in sctp_check_transmitted()
1517 					 * the destination that the TSN was  in sctp_check_transmitted()
1536 				if (TSN_lt(*highest_new_tsn_in_sack, tsn))  in sctp_check_transmitted()
1537 					*highest_new_tsn_in_sack = tsn;  in sctp_check_transmitted()
1544 			if (TSN_lte(tsn, sack_ctsn)) {  in sctp_check_transmitted()
1549 				 * with the earliest outstanding TSN  in sctp_check_transmitted()
1562 				 * 'Stray DATA chunk(s)' record the highest TSN  in sctp_check_transmitted()
1571 				 * unacknowledged DATA chunks whose TSN is  in sctp_check_transmitted()
1579 				pr_debug("%s: receiver reneged on data TSN:0x%x\n",  in sctp_check_transmitted()
1580 					 __func__, tsn);  in sctp_check_transmitted()
1590 				 * TSN that was previously acknowledged via a  in sctp_check_transmitted()
1615 			/* 8.2. When an outstanding TSN is acknowledged,  in sctp_check_transmitted()
1716 	__u32 tsn;  in sctp_mark_missing()  local
1723 		tsn = ntohl(chunk->subh.data_hdr->tsn);  in sctp_mark_missing()
1726 		 * 'Unacknowledged TSN's', if the TSN number of an  in sctp_mark_missing()
1727 		 * 'Unacknowledged TSN' is smaller than the 'HighestTSNinSack'  in sctp_mark_missing()
1728 		 * value, increment the 'TSN.Missing.Report' count on that  in sctp_mark_missing()
1734 		    TSN_lt(tsn, highest_new_tsn_in_sack)) {  in sctp_mark_missing()
1741 						count_of_newacks, tsn)) {  in sctp_mark_missing()
1744 				pr_debug("%s: tsn:0x%x missing counter:%d\n",  in sctp_mark_missing()
1745 					 __func__, tsn, chunk->tsn_missing_report);  in sctp_mark_missing()
1750 		 * 'TSN.Missing.Report'  in sctp_mark_missing()
1772 /* Is the given TSN acked by this packet?  */
1773 static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn)  in sctp_acked()  argument
1780 	if (TSN_lte(tsn, ctsn))  in sctp_acked()
1789 	 *  chunks with TSNs greater than or equal to (Cumulative TSN  in sctp_acked()
1791 	 *  (Cumulative TSN Ack + Gap Ack Block End) of each Gap Ack  in sctp_acked()
1797 	tsn_offset = tsn - ctsn;  in sctp_acked()
1829 	__u32 tsn;  in sctp_generate_fwdtsn()  local
1836 	/* PR-SCTP C1) Let SackCumAck be the Cumulative TSN ACK carried in the  in sctp_generate_fwdtsn()
1850 	 * Assuming that a SACK arrived with the Cumulative TSN ACK 102  in sctp_generate_fwdtsn()
1869 		tsn = ntohl(chunk->subh.data_hdr->tsn);  in sctp_generate_fwdtsn()
1874 		if (TSN_lte(tsn, ctsn)) {  in sctp_generate_fwdtsn()
1878 			if (TSN_lte(tsn, asoc->adv_peer_ack_point+1)) {  in sctp_generate_fwdtsn()
1879 				asoc->adv_peer_ack_point = tsn;  in sctp_generate_fwdtsn()
1900 	 * is greater than the Cumulative TSN ACK carried in the received  in sctp_generate_fwdtsn()
1901 	 * SACK, the data sender MUST send the data receiver a FORWARD TSN  in sctp_generate_fwdtsn()
1905 	 * C4) For each "abandoned" TSN the sender of the FORWARD TSN SHOULD  in sctp_generate_fwdtsn()
1906 	 * list each stream and sequence number in the forwarded TSN. This  in sctp_generate_fwdtsn()
1908 	 * stranded TSN's waiting on stream reorder queues. Each stream  in sctp_generate_fwdtsn()
1912 	 * total size of the FORWARD TSN does NOT fit in a single MTU then  in sctp_generate_fwdtsn()
1913 	 * the sender of the FORWARD TSN SHOULD lower the  in sctp_generate_fwdtsn()
1914 	 * Advanced.Peer.Ack.Point to the last TSN that will fit in a  in sctp_generate_fwdtsn()