diff options
Diffstat (limited to 'net/sctp/tsnmap.c')
| -rw-r--r-- | net/sctp/tsnmap.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/net/sctp/tsnmap.c b/net/sctp/tsnmap.c index 284a6b56a4f5..8773a7ee3ead 100644 --- a/net/sctp/tsnmap.c +++ b/net/sctp/tsnmap.c @@ -385,3 +385,23 @@ static void sctp_tsnmap_find_gap_ack(__u8 *map, __u16 off, } } } + +/* Renege that we have seen a TSN. */ +void sctp_tsnmap_renege(struct sctp_tsnmap *map, __u32 tsn) +{ + __s32 gap; + + if (TSN_lt(tsn, map->base_tsn)) + return; + if (!TSN_lt(tsn, map->base_tsn + map->len + map->len)) + return; + + /* Assert: TSN is in range. */ + gap = tsn - map->base_tsn; + + /* Pretend we never saw the TSN. */ + if (gap < map->len) + map->tsn_map[gap] = 0; + else + map->overflow_map[gap - map->len] = 0; +} |