#ifndef __sctp_tsnmap_h__
#define __sctp_tsnmap_h__
/* RFC 2960 12.2 Parameters necessary per association (i.e. the TCB)
* Mapping An array of bits or bytes indicating which out of
* Array order TSN's have been received (relative to the
* Last Rcvd TSN). If no gaps exist, i.e. no out of
* order packets have been received, this array
* will be set to all zero. This structure may be
* in the form of a circular buffer or bit array.
*/
struct sctp_tsnmap {
/* This array counts the number of chunks with each TSN.
* It points at one of the two buffers with which we will
* ping-pong between.
*/
unsigned long *tsn_map;
/* This is the TSN at tsn_map[0]. */
__u32 base_tsn;
/* Last Rcvd : This is the last TSN received in
* TSN : sequence. This value is set initially by
* : taking the peer's Initial TSN, received in
* : the INIT or INIT ACK chunk, and subtracting
* : one from it.
*
* Throughout most of the specification this is called the
* "Cumulative TSN ACK Point". In this case, we
* ignore the advice in 12.2 in favour of the term
* used in the bulk of the text.
*/
__u32 cumulative_tsn_ack_point;
/* This is the highest TSN we've marked. */
__u32 max_tsn_seen;
/* This is the minimum number of TSNs we can track. This corresponds
* to the size of tsn_map. Note: the overflow_map allows us to
* potentially track more than this quantity.
*/
__u16 len;
/* Data chunks pending receipt. used by SCTP_STATUS sockopt */
__u16 pending_data;
/* Record duplicate TSNs here. We clear this after
* every SACK. Store up to SCTP_MAX_DUP_TSNS worth of
* information.
*/
__u16 num_dup_tsns;
__be32 dup_tsns[SCTP_MAX_DUP_TSNS];
};
struct sctp_tsnmap_iter {
__u32 start;
};
/* Initialize a block of memory as a tsnmap. */
struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *, __u16 len,
__u32 initial_tsn, gfp_t gfp);
void sctp_tsnmap_free(struct sctp_tsnmap *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(const struct sctp_tsnmap *, __u32 tsn);
/* Mark this TSN as seen. */
int sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn,
struct sctp_transport *trans);
/* Mark this TSN and all lower as seen. */
void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn);
/* Retrieve the Cumulative TSN ACK Point. */
static inline __u32 sctp_tsnmap_get_ctsn(const struct sctp_tsnmap *map)
{
return map->cumulative_tsn_ack_point;
}
/* Retrieve the highest TSN we've seen. */
static inline __u32 sctp_tsnmap_get_max_tsn_seen(const struct sctp_tsnmap *map)
{
return map->max_tsn_seen;
}
/* How many duplicate TSNs are stored? */
static inline __u16 sctp_tsnmap_num_dups(struct sctp_tsnmap *map)
{
return map->num_dup_tsns;
}
/* Return pointer to duplicate tsn array as needed by SACK. */
static inline __be32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map)
{
map->num_dup_tsns = 0;
return map->dup_tsns;
}
/* How many gap ack blocks do we have recorded? */
__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map,
struct sctp_gap_ack_block *gabs);
/* Refresh the count on pending data. */
__u16 sctp_tsnmap_pending(struct sctp_tsnmap *map);
/* Is there a gap in the TSN map? */
static inline int sctp_tsnmap_has_gap(const struct sctp_tsnmap *map)
{
return map->cumulative_tsn_ack_point != map->max_tsn_seen;
}
/* Mark a duplicate TSN. Note: limit the storage of duplicate TSN
* information.
*/
static inline void sctp_tsnmap_mark_dup(struct sctp_tsnmap *map, __u32 tsn)
{
if (map->num_dup_tsns < SCTP_MAX_DUP_TSNS)
map->dup_tsns[map->num_dup_tsns++] = htonl(tsn);
}
/* Renege a TSN that was seen. */
void sctp_tsnmap_renege(struct sctp_tsnmap *, __u32 tsn);
/* Is there a gap in the TSN map? */
int sctp_tsnmap_has_gap(const struct sctp_tsnmap *);
#endif /* __sctp_tsnmap_h__ */
eca6a363ed7bb13ecea5cda809f7b97d'>3eb86259eca6a363ed7bb13ecea5cda809f7b97d (patch)
| tree | 39ad92d0c5496d4eab67741e6d5b61f3b9b0a370 /include/trace/events/irq.h |
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| parent | f95adbc1f7cef521d1d6b9146691d5971a660614 (diff) |
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| parent | 50f4d9bda9f8510db1392b4e832fca95c56295a1 (diff) |
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Merge branch 'akpm' (patches from Andrew)
Merge final set of updates from Andrew Morton:
- a series to make IMA play better across kexec
- a handful of random fixes
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
printk: fix typo in CONSOLE_LOGLEVEL_DEFAULT help text
ratelimit: fix WARN_ON_RATELIMIT return value
kcov: make kcov work properly with KASLR enabled
arm64: setup: introduce kaslr_offset()
mm: fadvise: avoid expensive remote LRU cache draining after FADV_DONTNEED
ima: platform-independent hash value
ima: define a canonical binary_runtime_measurements list format
ima: support restoring multiple template formats
ima: store the builtin/custom template definitions in a list
ima: on soft reboot, save the measurement list
powerpc: ima: send the kexec buffer to the next kernel
ima: maintain memory size needed for serializing the measurement list
ima: permit duplicate measurement list entries
ima: on soft reboot, restore the measurement list
powerpc: ima: get the kexec buffer passed by the previous kernel