static void
sctp_rc_timer(sctp_t *sctp, sctp_faddr_t *fp)
{
#define SCTP_CLR_SENT_FLAG(mp) ((mp)->b_flag &= ~SCTP_CHUNK_FLAG_SENT)
sctp_faddr_t *nfp;
sctp_faddr_t *ofp;
sctp_stack_t *sctps = sctp->sctp_sctps;
ASSERT(fp != NULL);
fp->rc_timer_running = 0;
if (sctp->sctp_state != SCTPS_ESTABLISHED ||
sctp->sctp_cxmit_list == NULL) {
return;
}
/*
* Not a retransmission, this was deferred due to some error
* condition
*/
if (!SCTP_CHUNK_ISSENT(sctp->sctp_cxmit_list)) {
sctp_wput_asconf(sctp, fp);
return;
}
/*
* The sent flag indicates if the msg has been sent on this fp.
*/
SCTP_CLR_SENT_FLAG(sctp->sctp_cxmit_list);
/* Retransmission */
if (sctp->sctp_strikes >= sctp->sctp_pa_max_rxt) {
/* time to give up */
BUMP_MIB(&sctps->sctps_mib, sctpAborted);
sctp_assoc_event(sctp, SCTP_COMM_LOST, 0, NULL);
sctp_clean_death(sctp, ETIMEDOUT);
return;
}
if (fp->strikes >= fp->max_retr) {
if (sctp_faddr_dead(sctp, fp, SCTP_FADDRS_DOWN) == -1)
return;
}
fp->strikes++;
sctp->sctp_strikes++;
SCTP_CALC_RXT(sctp, fp);
nfp = sctp_rotate_faddr(sctp, fp);
sctp->sctp_cchunk_pend = 0;
ofp = SCTP_CHUNK_DEST(sctp->sctp_cxmit_list);
SCTP_SET_CHUNK_DEST(sctp->sctp_cxmit_list, NULL);
ASSERT(ofp != NULL && ofp == fp);
ASSERT(ofp->suna >= MBLKL(sctp->sctp_cxmit_list));
/*
* Enter slow start for this destination.
* XXX anything in the data path that needs to be considered?
*/
ofp->ssthresh = ofp->cwnd / 2;
if (ofp->ssthresh < 2 * ofp->sfa_pmss)
ofp->ssthresh = 2 * ofp->sfa_pmss;
ofp->cwnd = ofp->sfa_pmss;
ofp->pba = 0;
ofp->suna -= MBLKL(sctp->sctp_cxmit_list);
/*
* The rexmit flags is used to determine if a serial number needs to
* be assigned or not, so once set we leave it there.
*/
if (!SCTP_CHUNK_WANT_REXMIT(sctp->sctp_cxmit_list))
SCTP_CHUNK_REXMIT(sctp->sctp_cxmit_list);
sctp_wput_asconf(sctp, nfp);
#undef SCTP_CLR_SENT_FLAG
}
/*
* Returns 0 if there is at leave one other active faddr, -1 if there
* are none. If there are none left, faddr_dead() will start killing the
* association.
* If the downed faddr was the current faddr, a new current faddr
* will be chosen.
*/
int
sctp_faddr_dead(sctp_t *sctp, sctp_faddr_t *fp, int newstate)
{
sctp_faddr_t *ofp;
sctp_stack_t *sctps = sctp->sctp_sctps;
if (fp->state == SCTP_FADDRS_ALIVE) {
sctp_intf_event(sctp, fp->faddr, SCTP_ADDR_UNREACHABLE, 0);
}
fp->state = newstate;
dprint(1, ("sctp_faddr_dead: %x:%x:%x:%x down (state=%d)\n",
SCTP_PRINTADDR(fp->faddr), newstate));
if (fp == sctp->sctp_current) {
/* Current faddr down; need to switch it */
sctp->sctp_current = NULL;
}
/* Find next alive faddr */
ofp = fp;
for (fp = fp->next; fp != NULL; fp = fp->next) {
if (fp->state == SCTP_FADDRS_ALIVE) {
break;
}
}
if (fp == NULL) {
/* Continue from beginning of list */
for (fp = sctp->sctp_faddrs; fp != ofp; fp = fp->next) {
if (fp->state == SCTP_FADDRS_ALIVE) {
break;
}
}
}
/*
* Find a new fp, so if the current faddr is dead, use the new fp
* as the current one.
*/
if (fp != ofp) {
if (sctp->sctp_current == NULL) {
dprint(1, ("sctp_faddr_dead: failover->%x:%x:%x:%x\n",
SCTP_PRINTADDR(fp->faddr)));
/*
* Note that we don't need to reset the source addr
* of the new fp.
*/
sctp_set_faddr_current(sctp, fp);
}
return (0);
}
/* All faddrs are down; kill the association */
dprint(1, ("sctp_faddr_dead: all faddrs down, killing assoc\n"));
BUMP_MIB(&sctps->sctps_mib, sctpAborted);
sctp_assoc_event(sctp, sctp->sctp_state < SCTPS_ESTABLISHED ?
SCTP_CANT_STR_ASSOC : SCTP_COMM_LOST, 0, NULL);
sctp_clean_death(sctp, sctp->sctp_client_errno ?
sctp->sctp_client_errno : ETIMEDOUT);
return (-1);
}
void
sctp_user_abort(sctp_t *sctp, mblk_t *data)
{
mblk_t *mp;
int len, hdrlen;
char *cause;
sctp_faddr_t *fp = sctp->sctp_current;
ip_xmit_attr_t *ixa = fp->sf_ixa;
sctp_stack_t *sctps = sctp->sctp_sctps;
/*
* Don't need notification if connection is not yet setup,
* call sctp_clean_death() to reclaim resources.
* Any pending connect call(s) will error out.
*/
if (sctp->sctp_state < SCTPS_COOKIE_WAIT) {
sctp_clean_death(sctp, ECONNABORTED);
return;
}
mp = sctp_make_mp(sctp, fp, 0);
if (mp == NULL) {
SCTP_KSTAT(sctps, sctp_send_user_abort_failed);
return;
}
/*
* Create abort chunk.
*/
if (data) {
if (fp->sf_isv4) {
hdrlen = sctp->sctp_hdr_len;
} else {
hdrlen = sctp->sctp_hdr6_len;
}
hdrlen += sizeof (sctp_chunk_hdr_t) + sizeof (sctp_parm_hdr_t);
cause = (char *)data->b_rptr;
len = data->b_wptr - data->b_rptr;
if (len + hdrlen > fp->sf_pmss) {
len = fp->sf_pmss - hdrlen;
}
} else {
cause = NULL;
len = 0;
}
/*
* Since it is a user abort, we should have the sctp_t and hence
* the correct verification tag. So we should not set the T-bit
* in the ABORT.
*/
if ((len = sctp_link_abort(mp, SCTP_ERR_USER_ABORT, cause, len, 0,
B_FALSE)) < 0) {
freemsg(mp);
return;
}
SCTPS_BUMP_MIB(sctps, sctpAborted);
BUMP_LOCAL(sctp->sctp_opkts);
BUMP_LOCAL(sctp->sctp_obchunks);
sctp_set_iplen(sctp, mp, ixa);
ASSERT(ixa->ixa_ire != NULL);
ASSERT(ixa->ixa_cred != NULL);
(void) conn_ip_output(mp, ixa);
sctp_assoc_event(sctp, SCTP_COMM_LOST, 0, NULL);
sctp_clean_death(sctp, ECONNABORTED);
}