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2 Bugs:

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1) Only use both mapping arrays when NR sack is off. This
   way we can hold off moving the cumack (not the best but
   workable) when NR-sack is on.

2) We must make sure to just return on the move of the
   bit to the NR array if the cum-ack as already went
   past the TSN. This prevents marking a bit behind the
   array and hitting the invariant code that panic's us.

MFC after:	1 week
This commit is contained in:
rrs 2010-06-08 03:39:31 +00:00
parent 7aeb20c5a4
commit 8bbbdc4764
1 changed files with 20 additions and 2 deletions
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22
sys/netinet/sctp_indata.c
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@ -289,12 +289,20 @@ sctp_build_ctl_cchunk(struct sctp_inpcb *inp,
static void
sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
{
uint32_t gap, i;
uint32_t gap, i, cumackp1;
int fnd = 0;
if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
return;
}
cumackp1 = asoc->cumulative_tsn + 1;
if (compare_with_wrap(cumackp1, tsn, MAX_TSN)) {
/*
* this tsn is behind the cum ack and thus we don't need to
* worry about it being moved from one to the other.
*/
return;
}
SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
printf("gap:%x tsn:%x\n", gap, tsn);
@ -2259,6 +2267,7 @@ sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
uint8_t val;
int slide_from, slide_end, lgap, distance;
uint32_t old_cumack, old_base, old_highest, highest_tsn;
int type;
asoc = &stcb->asoc;
at = 0;
@ -2270,9 +2279,18 @@ sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
* We could probably improve this a small bit by calculating the
* offset of the current cum-ack as the starting point.
*/
if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) &&
stcb->asoc.peer_supports_nr_sack) {
type = SCTP_NR_SELECTIVE_ACK;
} else {
type = SCTP_SELECTIVE_ACK;
}
at = 0;
for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
if (type == SCTP_NR_SELECTIVE_ACK)
val = asoc->nr_mapping_array[slide_from];
else
val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
if (val == 0xff) {
at += 8;
} else {