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Improve the selection of the destination address of SACK chunks.

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This fixes
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196755
and is joint work with rrs@.

MFC after: 1 week
This commit is contained in:
Michael Tuexen 2015-03-26 22:05:31 +00:00
parent 73cc817ec8
commit d59909c3e2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=280714
2 changed files with 4 additions and 20 deletions
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23
sys/netinet/sctp_output.c
View File

@ -10409,32 +10409,17 @@ sctp_send_sack(struct sctp_tcb *stcb, int so_locked
a_chk->sent = SCTP_DATAGRAM_UNSENT;
a_chk->whoTo = NULL;
if ((asoc->numduptsns) ||
(!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE))) {
if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
/*-
* Ok, we have some duplicates or the destination for the
* sack is unreachable, lets see if we can select an
* alternate than asoc->last_data_chunk_from
* Ok, the destination for the SACK is unreachable, lets see if
* we can select an alternate to asoc->last_data_chunk_from
*/
if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) &&
(asoc->used_alt_onsack > asoc->numnets)) {
/* We used an alt last time, don't this time */
a_chk->whoTo = NULL;
} else {
asoc->used_alt_onsack++;
a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
}
a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
if (a_chk->whoTo == NULL) {
/* Nope, no alternate */
a_chk->whoTo = asoc->last_data_chunk_from;
asoc->used_alt_onsack = 0;
}
} else {
/*
* No duplicates so we use the last place we received data
* from.
*/
asoc->used_alt_onsack = 0;
a_chk->whoTo = asoc->last_data_chunk_from;
}
if (a_chk->whoTo) {

1
sys/netinet/sctp_structs.h
View File

@ -1174,7 +1174,6 @@ struct sctp_association {
struct sctp_scoping scope;
/* flags to handle send alternate net tracking */
uint8_t used_alt_onsack;
uint8_t used_alt_asconfack;
uint8_t fast_retran_loss_recovery;
uint8_t sat_t3_loss_recovery;