29 static void sctp_tsnmap_update(struct sctp_tsnmap *map);
30 static void sctp_tsnmap_find_gap_ack(unsigned long *map, __u16 off,
32 static int sctp_tsnmap_grow(struct sctp_tsnmap *map, u16 size);
35 struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *map, __u16 len,  in sctp_tsnmap_init()  argument
38 	if (!map->tsn_map) {  in sctp_tsnmap_init()
39 		map->tsn_map = kzalloc(len>>3, gfp);  in sctp_tsnmap_init()
40 		if (map->tsn_map == NULL)  in sctp_tsnmap_init()
43 		map->len = len;  in sctp_tsnmap_init()
45 		bitmap_zero(map->tsn_map, map->len);  in sctp_tsnmap_init()
49 	map->base_tsn = initial_tsn;  in sctp_tsnmap_init()
50 	map->cumulative_tsn_ack_point = initial_tsn - 1;  in sctp_tsnmap_init()
51 	map->max_tsn_seen = map->cumulative_tsn_ack_point;  in sctp_tsnmap_init()
52 	map->num_dup_tsns = 0;  in sctp_tsnmap_init()
54 	return map;  in sctp_tsnmap_init()
57 void sctp_tsnmap_free(struct sctp_tsnmap *map)  in sctp_tsnmap_free()  argument
59 	map->len = 0;  in sctp_tsnmap_free()
60 	kfree(map->tsn_map);  in sctp_tsnmap_free()
69 int sctp_tsnmap_check(const struct sctp_tsnmap *map, __u32 tsn)  in sctp_tsnmap_check()  argument
74 	if (TSN_lte(tsn, map->cumulative_tsn_ack_point))  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()
87 	if (gap < map->len && test_bit(gap, map->tsn_map))  in sctp_tsnmap_check()
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()
105 	if (gap >= map->len && !sctp_tsnmap_grow(map, gap + 1))  in sctp_tsnmap_mark()
108 	if (!sctp_tsnmap_has_gap(map) && gap == 0) {  in sctp_tsnmap_mark()
113 		map->max_tsn_seen++;  in sctp_tsnmap_mark()
114 		map->cumulative_tsn_ack_point++;  in sctp_tsnmap_mark()
118 		map->base_tsn++;  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()
129 		set_bit(gap, map->tsn_map);  in sctp_tsnmap_mark()
134 		sctp_tsnmap_update(map);  in sctp_tsnmap_mark()
142 static void sctp_tsnmap_iter_init(const struct sctp_tsnmap *map,  in sctp_tsnmap_iter_init()  argument
146 	iter->start = map->cumulative_tsn_ack_point + 1;  in sctp_tsnmap_iter_init()
152 static int sctp_tsnmap_next_gap_ack(const struct sctp_tsnmap *map,  in sctp_tsnmap_next_gap_ack()  argument
160 	if (TSN_lte(map->max_tsn_seen, iter->start))  in sctp_tsnmap_next_gap_ack()
163 	offset = iter->start - map->base_tsn;  in sctp_tsnmap_next_gap_ack()
164 	sctp_tsnmap_find_gap_ack(map->tsn_map, offset, map->len,  in sctp_tsnmap_next_gap_ack()
169 		end_ = map->len - 1;  in sctp_tsnmap_next_gap_ack()
182 		iter->start = map->cumulative_tsn_ack_point + *end + 1;  in sctp_tsnmap_next_gap_ack()
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()
205 	map->base_tsn += gap;  in sctp_tsnmap_skip()
206 	map->cumulative_tsn_ack_point += gap;  in sctp_tsnmap_skip()
207 	if (gap >= map->len) {  in sctp_tsnmap_skip()
211 		bitmap_zero(map->tsn_map, map->len);  in sctp_tsnmap_skip()
216 		bitmap_shift_right(map->tsn_map, map->tsn_map, gap, map->len);  in sctp_tsnmap_skip()
217 		sctp_tsnmap_update(map);  in sctp_tsnmap_skip()
228 static void sctp_tsnmap_update(struct sctp_tsnmap *map)  in sctp_tsnmap_update()  argument
234 	len = map->max_tsn_seen - map->cumulative_tsn_ack_point;  in sctp_tsnmap_update()
235 	zero_bit = find_first_zero_bit(map->tsn_map, len);  in sctp_tsnmap_update()
239 	map->base_tsn += zero_bit;  in sctp_tsnmap_update()
240 	map->cumulative_tsn_ack_point += zero_bit;  in sctp_tsnmap_update()
242 	bitmap_shift_right(map->tsn_map, map->tsn_map, zero_bit, map->len);  in sctp_tsnmap_update()
247 __u16 sctp_tsnmap_pending(struct sctp_tsnmap *map)  in sctp_tsnmap_pending()  argument
249 	__u32 cum_tsn = map->cumulative_tsn_ack_point;  in sctp_tsnmap_pending()
250 	__u32 max_tsn = map->max_tsn_seen;  in sctp_tsnmap_pending()
251 	__u32 base_tsn = map->base_tsn;  in sctp_tsnmap_pending()
258 	if (gap == 0 || gap >= map->len)  in sctp_tsnmap_pending()
261 	pending_data -= bitmap_weight(map->tsn_map, gap + 1);  in sctp_tsnmap_pending()
272 static void sctp_tsnmap_find_gap_ack(unsigned long *map, __u16 off,  in sctp_tsnmap_find_gap_ack()  argument
284 	i = find_next_bit(map, len, off);  in sctp_tsnmap_find_gap_ack()
293 		i = find_next_zero_bit(map, len, i);  in sctp_tsnmap_find_gap_ack()
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()
307 	if (!TSN_lt(tsn, map->base_tsn + map->len))  in sctp_tsnmap_renege()
310 	gap = tsn - map->base_tsn;  in sctp_tsnmap_renege()
313 	clear_bit(gap, map->tsn_map);  in sctp_tsnmap_renege()
317 __u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map,  in sctp_tsnmap_num_gabs()  argument
324 	if (sctp_tsnmap_has_gap(map)) {  in sctp_tsnmap_num_gabs()
326 		sctp_tsnmap_iter_init(map, &iter);  in sctp_tsnmap_num_gabs()
327 		while (sctp_tsnmap_next_gap_ack(map, &iter,  in sctp_tsnmap_num_gabs()
341 static int sctp_tsnmap_grow(struct sctp_tsnmap *map, u16 size)  in sctp_tsnmap_grow()  argument
350 	inc = ALIGN((size - map->len), BITS_PER_LONG) + SCTP_TSN_MAP_INCREMENT;  in sctp_tsnmap_grow()
351 	len = min_t(u16, map->len + inc, SCTP_TSN_MAP_SIZE);  in sctp_tsnmap_grow()
357 	bitmap_copy(new, map->tsn_map,  in sctp_tsnmap_grow()
358 		map->max_tsn_seen - map->cumulative_tsn_ack_point);  in sctp_tsnmap_grow()
359 	kfree(map->tsn_map);  in sctp_tsnmap_grow()
360 	map->tsn_map = new;  in sctp_tsnmap_grow()
361 	map->len = len;  in sctp_tsnmap_grow()