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()
501 			 * 'TSN.Missing.Report' of all affected TSNs is set  in sctp_retransmit_mark()
612 	 * E3) Determine how many of the earliest (i.e., lowest TSN)  in __sctp_outq_flush_rtx()
958 			/* PR-SCTP C5) If a FORWARD TSN is sent, the  in sctp_outq_flush_ctrl()
1093 		pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p skb->users:%d\n",  in sctp_outq_flush_data()
1096 			 "illegal chunk", ntohl(chunk->subh.data_hdr->tsn),  in sctp_outq_flush_data()
1107 			pr_debug("%s: could not transmit tsn:0x%x, status:%d\n",  in sctp_outq_flush_data()
1108 				 __func__, ntohl(chunk->subh.data_hdr->tsn),  in sctp_outq_flush_data()
1198 	 *   within a SCTP packet in increasing order of TSN.  in sctp_outq_flush()
1246 	__u32 sack_ctsn, ctsn, tsn;  in sctp_outq_sack()  local
1304 	/* Get the highest TSN in the sack. */  in sctp_outq_sack()
1337 	/* Move the Cumulative TSN Ack Point if appropriate.  */  in sctp_outq_sack()
1362 		tsn = ntohl(tchunk->subh.data_hdr->tsn);  in sctp_outq_sack()
1363 		if (TSN_lte(tsn, ctsn)) {  in sctp_outq_sack()
1374 	 *     Cumulative TSN Ack and the Gap Ack Blocks.  in sctp_outq_sack()
1390 	pr_debug("%s: sack cumulative tsn ack:0x%x\n", __func__, sack_ctsn);  in sctp_outq_sack()
1391 	pr_debug("%s: cumulative tsn ack of assoc:%p is 0x%x, "  in sctp_outq_sack()
1413  * list and move chunks that are acked by the Cumulative TSN Ack to q->sacked.
1418  * Instead of printing 'sacked' or 'kept' for each TSN on the
1432 	__u32 tsn;  in sctp_check_transmitted()  local
1466 		tsn = ntohl(tchunk->subh.data_hdr->tsn);  in sctp_check_transmitted()
1467 		if (sctp_acked(sack, tsn)) {  in sctp_check_transmitted()
1493 				if (TSN_lte(tsn, sack_ctsn)) {  in sctp_check_transmitted()
1501 					 * B) For each TSN t being acked that  in sctp_check_transmitted()
1504 					 * the destination that the TSN was  in sctp_check_transmitted()
1523 				if (TSN_lt(*highest_new_tsn_in_sack, tsn))  in sctp_check_transmitted()
1524 					*highest_new_tsn_in_sack = tsn;  in sctp_check_transmitted()
1531 			if (TSN_lte(tsn, sack_ctsn)) {  in sctp_check_transmitted()
1536 				 * with the earliest outstanding TSN  in sctp_check_transmitted()
1549 				 * 'Stray DATA chunk(s)' record the highest TSN  in sctp_check_transmitted()
1558 				 * unacknowledged DATA chunks whose TSN is  in sctp_check_transmitted()
1566 				pr_debug("%s: receiver reneged on data TSN:0x%x\n",  in sctp_check_transmitted()
1567 					 __func__, tsn);  in sctp_check_transmitted()
1577 				 * TSN that was previously acknowledged via a  in sctp_check_transmitted()
1602 			/* 8.2. When an outstanding TSN is acknowledged,  in sctp_check_transmitted()
1703 	__u32 tsn;  in sctp_mark_missing()  local
1710 		tsn = ntohl(chunk->subh.data_hdr->tsn);  in sctp_mark_missing()
1713 		 * 'Unacknowledged TSN's', if the TSN number of an  in sctp_mark_missing()
1714 		 * 'Unacknowledged TSN' is smaller than the 'HighestTSNinSack'  in sctp_mark_missing()
1715 		 * value, increment the 'TSN.Missing.Report' count on that  in sctp_mark_missing()
1721 		    TSN_lt(tsn, highest_new_tsn_in_sack)) {  in sctp_mark_missing()
1728 						count_of_newacks, tsn)) {  in sctp_mark_missing()
1731 				pr_debug("%s: tsn:0x%x missing counter:%d\n",  in sctp_mark_missing()
1732 					 __func__, tsn, chunk->tsn_missing_report);  in sctp_mark_missing()
1737 		 * 'TSN.Missing.Report'  in sctp_mark_missing()
1759 /* Is the given TSN acked by this packet?  */
1760 static int sctp_acked(struct sctp_sackhdr *sack, __u32 tsn)  in sctp_acked()  argument
1767 	if (TSN_lte(tsn, ctsn))  in sctp_acked()
1776 	 *  chunks with TSNs greater than or equal to (Cumulative TSN  in sctp_acked()
1778 	 *  (Cumulative TSN Ack + Gap Ack Block End) of each Gap Ack  in sctp_acked()
1784 	tsn_offset = tsn - ctsn;  in sctp_acked()
1816 	__u32 tsn;  in sctp_generate_fwdtsn()  local
1823 	/* PR-SCTP C1) Let SackCumAck be the Cumulative TSN ACK carried in the  in sctp_generate_fwdtsn()
1837 	 * Assuming that a SACK arrived with the Cumulative TSN ACK 102  in sctp_generate_fwdtsn()
1856 		tsn = ntohl(chunk->subh.data_hdr->tsn);  in sctp_generate_fwdtsn()
1861 		if (TSN_lte(tsn, ctsn)) {  in sctp_generate_fwdtsn()
1865 			if (TSN_lte(tsn, asoc->adv_peer_ack_point+1)) {  in sctp_generate_fwdtsn()
1866 				asoc->adv_peer_ack_point = tsn;  in sctp_generate_fwdtsn()
1887 	 * is greater than the Cumulative TSN ACK carried in the received  in sctp_generate_fwdtsn()
1888 	 * SACK, the data sender MUST send the data receiver a FORWARD TSN  in sctp_generate_fwdtsn()
1892 	 * C4) For each "abandoned" TSN the sender of the FORWARD TSN SHOULD  in sctp_generate_fwdtsn()
1893 	 * list each stream and sequence number in the forwarded TSN. This  in sctp_generate_fwdtsn()
1895 	 * stranded TSN's waiting on stream reorder queues. Each stream  in sctp_generate_fwdtsn()
1899 	 * total size of the FORWARD TSN does NOT fit in a single MTU then  in sctp_generate_fwdtsn()
1900 	 * the sender of the FORWARD TSN SHOULD lower the  in sctp_generate_fwdtsn()
1901 	 * Advanced.Peer.Ack.Point to the last TSN that will fit in a  in sctp_generate_fwdtsn()