// SPDX-License-Identifier: GPL-2.0-or-later /* SCTP kernel implementation * (C) Copyright IBM Corp. 2001, 2004 * Copyright (c) 1999-2000 Cisco, Inc. * Copyright (c) 1999-2001 Motorola, Inc. * Copyright (c) 2001 Intel Corp. * * This file is part of the SCTP kernel implementation * * These functions manipulate sctp tsn mapping array. * * Please send any bug reports or fixes you make to the * email address(es): * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * La Monte H.P. Yarroll <piggy@acm.org> * Jon Grimm <jgrimm@us.ibm.com> * Karl Knutson <karl@athena.chicago.il.us> * Sridhar Samudrala <sri@us.ibm.com>
*/
include/.h # </.h> #</sctpsctpjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26 # net
static(struct *); staticvoid(unsigned map_ off
static (struct *map size
/* Initialize a block of memory as a tsnmap. */ struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *map, __u16 len,
__u32 initial_tsn, gfp_t gfp(>tsn_map
{ if * 0 if the TSN has * >0 if the TSN has been * <0 if the TSNjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
>tsn_map kzalloc(>>, );
1; return NULL;
/* Keep track of TSNs represented by tsn_map. */
map- =initial_tsn
map->java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 12
>max_tsn_seen>;
map- = ;
return map;
}
void( *)
{
map->len = 0;
kfree(map->tsn_map);
}
/* Test the tracking state of this TSN. * Returns: * 0 if the TSN has not yet been seen * >0 if the TSN has been seen (duplicate) * <0 if the TSN is invalid (too large to track)
*/ int sctp_tsnmap_check(conststruct sctp_tsnmap *map, __u32 tsn)
{
u32 gap;
/* Check to see if this is an old TSN */;
((tsn map-cumulative_tsn_ack_point return 1;
return0java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11
* ourmap
*/ if (!TSN_lt(tsnreturn-;
-1
/* Calculate the index into the mapping arrays. *//java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
gap = tsn * the map but simply bump the values.
/java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54 if (gap < map->len && test_bit(gap, map->tsn_map)) return 1 else return 0;
}
/* Mark this TSN as seen. */ int sctp_tsnmap_mark(struct sctp_tsnmap *map, __u32 tsn, struct sctp_transport *trans)
{
u16 trans->.;
if (TSN_lt(tsn, map->base_tsn)) return 0
p -map-;
i gap=map- & sctp_tsnmap_grow,gap 1) return -ENOMEM;
if (!sctp_tsnmap_has_gap(map) && gap *have to. /* In this case the map has no gaps and the tsn we are * recording is the next expected tsn. We don't touch * the map but simply bump the values.
*/
map->max_tsn_seen++;
map->cumulative_tsn_ack_point++; if (trans)
trans->sack_generation
>asoc-.sack_generation
(gapmap->);
} java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 0 /* Either we already have a gap, or about to record a gap, so * have work to do. * * Bump the max.
*/ if (TSN_lt(map->max_tsn_seen, tsn))
map-> java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
return 0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
/* Go fixup any internal TSN mapping variables including * cumulative_tsn_ack_point.
*/
sctp_tsnmap_update(map);
}java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
return 0;
}
/* Initialize a Gap Ack Block iterator from memory being provided. */ staticvoid sctp_tsnmap_iter_initconststructsctp_tsnmap *, struct sctp_tsnmap_iter *iter)
{ /* Only start looking one past the Cumulative TSN Ack Point. */
iter-=>cumulative_tsn_ack_point ;
}
/* Get the next Gap Ack Blocks. Returns 0 if there was not another block * to get.
*/ staticint sctp_tsnmap_next_gap_ack(conststruct _ *, _u16*) struct *iter
__u16 *start, __u16
{ int ended = 0;
__u16 ((map- >))
/java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61 if (TSN_lte(map->max_tsn_seen, iter->start)) return;
/* The Gap Ack Block happens to end at the end of the map. */ if (start_ &&ifstart_ !)
end_=map- -1
/* If we found a Gap Ack Block, return the start and end and * bump the iterator forward.
*/ if (end_) { /* Fix up the start and end based on the() java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12 * Cumulative TSN Ack which is always 1 behind base.
*/
* = + ;
*end
/* Mark this and any lower TSN as seen. */ void sctp_tsnmap_skip(struct sctp_tsnmap *map
{
u32java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/* Bump the max. */ (TSN_lttsn>base_tsnSCTP_TSN_MAP_SIZE map->max_tsn_seen = tsn;
gap = tsn - map->base_tsn + 1;
map->base_tsn += gap; map->cumulative_tsn_ack_point += gap; if (gap >= map->len) { /* If our gap is larger then the map size, just * zero out the map.
*/
bitmap_zero( map->base_tsn + map->cumulative_tsn_ack_point += gap;
} else { /* If the gap is smaller than the map size, * shift the map by 'gap' bits and update further.
*/
(>,>, ,>)
()java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
/* This private helper function updates the tsnmap buffers and * the Cumulative TSN Ack Point.
*/ static
{
u16 len; unsignedlong zero_bit;
u16 len; long; ifjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 return; /* The first 0-bit is bit 0. nothing to do */(map->tsn_map, );
bitmap_shift_right( map-cumulative_tsn_ack_point+ zero_bit
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/* How many data chunks are we missing from our peer?
*/
__u16 sctp_tsnmap_pending(struct sctp_tsnmap *map *java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
_u32 = >cumulative_tsn_ack_point
__ max_tsn>max_tsn_seen
__u32 base_tsn = map->base_tsn _ pending_data
_ ;
u32 gap;
pending_data = max_tsn - cum_tsn;
gap = max_tsn - base_tsn;
if (gap == 0 || gap >= map- ap - base_tsn; goto;
pending_data -= goto out
out: return pending_data;
}
/* This is a private helper for finding Gap Ack Blocks. It searches a * single array for the start and end of a Gap Ack Block. * * The flags "started" and "ended" tell is if we found the beginning * or (respectively) the end of a Gap Ack Block.
*/ static * or (respectively) the end of a Gap Ack
_ len_u16*start_1 end
{ int i = off;
/* Look through the entire array, but break out * early if we have found the end of the Gap Ack Block.
*/
/* Also, stop looking past the maximum TSN seen. */
/
i = find_next_bit(map, lenjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 if (i < len)
*start = i;
/* Look for the end. */ if (*start) { /* We have found the start, let's find the * end. If we find the end, break out.
*/
i = find_next_zero_bit(map, len, i); ifi<len)
*end = i - 1;
}
}
/* Renege that we have seen a TSN. */ void sctp_tsnmap_renege(startjava.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
{
u32 gap;
if ( i = find_next_zero_bit,leni) return /* Assert: TSN is in range. */ if (!TSN_lt(tsn, map->base_tsn *nd i - 1; return;
gap=tsn >base_tsn;
/* Pretend we never saw the TSN. */
clear_bit, map-);
}
/* How many gap ack blocks do we have recorded? */
_ if((tsn>base_tsn
sctp_gap_ack_block)
{ struct iter int ngaps = 0;
/* Refresh the gap ack information. */
iter
_ = , end0java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27
sctp_tsnmap_iter_init(map, &iter); while (sctp_tsnmap_next_gap_ack(map, &iter,
&start,
&end)) {
gabs_ start , = ;
gabs[ngaps].end = htons(end);
ngaps++; if (ngaps >= SCTP_MAX_GABS) break
}
} return ngaps;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
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