10  * These functions manipulate sctp tsn mapping array.
63 /* Test the tracking state of this TSN.
65  *   0 if the TSN has not yet been seen
66  *  >0 if the TSN has been seen (duplicate)
67  *  <0 if the TSN is invalid (too large to track)
69 int sctp_tsnmap_check(const struct sctp_tsnmap *map, __u32 tsn)  in sctp_tsnmap_check()  argument
73 	/* Check to see if this is an old TSN */  in sctp_tsnmap_check()
74 	if (TSN_lte(tsn, map->cumulative_tsn_ack_point))  in sctp_tsnmap_check()
77 	/* Verify that we can hold this TSN and that it will not  in sctp_tsnmap_check()
80 	if (!TSN_lt(tsn, map->base_tsn + SCTP_TSN_MAP_SIZE))  in sctp_tsnmap_check()
84 	gap = tsn - map->base_tsn;  in sctp_tsnmap_check()
86 	/* Check to see if TSN has already been recorded.  */  in sctp_tsnmap_check()
94 /* Mark this TSN as seen.  */
95 int sctp_tsnmap_mark(struct sctp_tsnmap *map, __u32 tsn,  in sctp_tsnmap_mark()  argument
100 	if (TSN_lt(tsn, map->base_tsn))  in sctp_tsnmap_mark()
103 	gap = tsn - map->base_tsn;  in sctp_tsnmap_mark()
109 		/* In this case the map has no gaps and the tsn we are  in sctp_tsnmap_mark()
110 		 * recording is the next expected tsn.  We don't touch  in sctp_tsnmap_mark()
125 		if (TSN_lt(map->max_tsn_seen, tsn))  in sctp_tsnmap_mark()
126 			map->max_tsn_seen = tsn;  in sctp_tsnmap_mark()
128 		/* Mark the TSN as received.  */  in sctp_tsnmap_mark()
131 		/* Go fixup any internal TSN mapping variables including  in sctp_tsnmap_mark()
145 	/* Only start looking one past the Cumulative TSN Ack Point.  */  in sctp_tsnmap_iter_init()
176 		 * Cumulative TSN Ack which is always 1 behind base.  in sctp_tsnmap_next_gap_ack()
189 /* Mark this and any lower TSN as seen.  */
190 void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn)  in sctp_tsnmap_skip()  argument
194 	if (TSN_lt(tsn, map->base_tsn))  in sctp_tsnmap_skip()
196 	if (!TSN_lt(tsn, map->base_tsn + SCTP_TSN_MAP_SIZE))  in sctp_tsnmap_skip()
200 	if (TSN_lt(map->max_tsn_seen, tsn))  in sctp_tsnmap_skip()
201 		map->max_tsn_seen = tsn;  in sctp_tsnmap_skip()
203 	gap = tsn - map->base_tsn + 1;  in sctp_tsnmap_skip()
226  * the Cumulative TSN Ack Point.
281 	/* Also, stop looking past the maximum TSN seen. */  in sctp_tsnmap_find_gap_ack()
299 /* Renege that we have seen a TSN.  */
300 void sctp_tsnmap_renege(struct sctp_tsnmap *map, __u32 tsn)  in sctp_tsnmap_renege()  argument
304 	if (TSN_lt(tsn, map->base_tsn))  in sctp_tsnmap_renege()
306 	/* Assert: TSN is in range.  */  in sctp_tsnmap_renege()
307 	if (!TSN_lt(tsn, map->base_tsn + map->len))  in sctp_tsnmap_renege()
310 	gap = tsn - map->base_tsn;  in sctp_tsnmap_renege()
312 	/* Pretend we never saw the TSN.  */  in sctp_tsnmap_renege()