/*
* Reset any state related to transmitted chunks.
*/
void
sctp_congest_reset(sctp_t *sctp)
{
sctp_faddr_t *fp;
sctp_stack_t *sctps = sctp->sctp_sctps;
mblk_t *mp;
for (fp = sctp->sctp_faddrs; fp != NULL; fp = fp->next) {
fp->ssthresh = sctps->sctps_initial_mtu;
SET_CWND(fp, fp->sfa_pmss, sctps->sctps_slow_start_initial);
fp->suna = 0;
fp->pba = 0;
}
/*
* Clean up the transmit list as well since we have reset accounting
* on all the fps. Send event upstream, if required.
*/
while ((mp = sctp->sctp_xmit_head) != NULL) {
sctp->sctp_xmit_head = mp->b_next;
mp->b_next = NULL;
if (sctp->sctp_xmit_head != NULL)
sctp->sctp_xmit_head->b_prev = NULL;
sctp_sendfail_event(sctp, mp, 0, B_TRUE);
}
sctp->sctp_xmit_head = NULL;
sctp->sctp_xmit_tail = NULL;
sctp->sctp_xmit_unacked = NULL;
sctp->sctp_unacked = 0;
/*
* Any control message as well. We will clean-up this list as well.
* This contains any pending ASCONF request that we have queued/sent.
* If we do get an ACK we will just drop it. However, given that
* we are restarting chances are we aren't going to get any.
*/
if (sctp->sctp_cxmit_list != NULL)
sctp_asconf_free_cxmit(sctp, NULL);
sctp->sctp_cxmit_list = NULL;
sctp->sctp_cchunk_pend = 0;
sctp->sctp_rexmitting = B_FALSE;
sctp->sctp_rxt_nxttsn = 0;
sctp->sctp_rxt_maxtsn = 0;
sctp->sctp_zero_win_probe = B_FALSE;
}
/*
* Returns 0 on non-fatal error, otherwise a system error on fatal
* error.
*/
int
sctp_handle_error(sctp_t *sctp, sctp_hdr_t *sctph, sctp_chunk_hdr_t *ch,
mblk_t *mp, ip_recv_attr_t *ira)
{
sctp_parm_hdr_t *errh;
sctp_chunk_hdr_t *uch;
if (ch->sch_len == htons(sizeof (*ch))) {
/* no error cause given */
return (0);
}
errh = (sctp_parm_hdr_t *)(ch + 1);
sctp_error_event(sctp, ch, B_FALSE);
switch (errh->sph_type) {
/*
* Both BAD_SID and NO_USR_DATA errors
* indicate a serious bug in our stack,
* so complain and abort the association.
*/
case SCTP_ERR_BAD_SID:
cmn_err(CE_WARN, "BUG! send to invalid SID");
sctp_send_abort(sctp, sctph->sh_verf, 0, NULL, 0, mp, 0, 0,
ira);
return (ECONNABORTED);
case SCTP_ERR_NO_USR_DATA:
cmn_err(CE_WARN, "BUG! no usr data");
sctp_send_abort(sctp, sctph->sh_verf, 0, NULL, 0, mp, 0, 0,
ira);
return (ECONNABORTED);
case SCTP_ERR_UNREC_CHUNK:
/* Pull out the unrecognized chunk type */
if (ntohs(errh->sph_len) < (sizeof (*errh) + sizeof (*uch))) {
/* Not enough to process */
return (0);
}
uch = (sctp_chunk_hdr_t *)(errh + 1);
if (uch->sch_id == CHUNK_ASCONF) {
/* Turn on ASCONF sending */
sctp->sctp_understands_asconf = B_FALSE;
/*
* Hand off to asconf to clear out the unacked
* asconf chunk.
*/
if (ntohs(uch->sch_len) !=
(ntohs(errh->sph_len) - sizeof (*errh))) {
/* malformed */
dprint(0, ("Malformed Unrec Chunk error\n"));
return (0);
}
sctp_asconf_free_cxmit(sctp, uch);
return (0);
}
/* Else drop it */
break;
default:
break;
}
return (0);
}
