--- /dev/null
+/*
+ * Copyright (c) 2012-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/mcache.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/syslog.h>
+#include <sys/protosw.h>
+#include <sys/sysctl.h>
+
+#include <mach/sdt.h>
+
+#include <netinet/mp_pcb.h>
+#include <netinet/mptcp_var.h>
+#include <netinet/mptcp_timer.h>
+#include <netinet/mptcp_seq.h>
+
+#include <kern/locks.h>
+
+/*
+ * MPTCP Retransmission Timer comes into play only when subflow level
+ * data is acked, but Data ACK is not received. Time is in seconds.
+ */
+static u_int32_t mptcp_rto = 3;
+SYSCTL_INT(_net_inet_mptcp, OID_AUTO, rto, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &mptcp_rto, 0, "MPTCP Retransmission Timeout");
+
+static int mptcp_nrtos = 3;
+SYSCTL_INT(_net_inet_mptcp, OID_AUTO, nrto, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &mptcp_rto, 0, "MPTCP Retransmissions");
+
+/*
+ * MPTCP connections timewait interval in seconds.
+ */
+static u_int32_t mptcp_tw = 60;
+SYSCTL_INT(_net_inet_mptcp, OID_AUTO, tw, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &mptcp_tw, 0, "MPTCP Timewait Period");
+
+#define TIMEVAL_TO_HZ(_tv_) ((_tv_).tv_sec * hz + (_tv_).tv_usec / hz)
+
+static int
+mptcp_timer_demux(struct mptses *mpte, uint32_t now_msecs)
+{
+ struct mptcb *mp_tp = NULL;
+ mp_tp = mpte->mpte_mptcb;
+ int resched_timer = 0;
+
+ DTRACE_MPTCP2(timer, struct mptses *, mpte, struct mptcb *, mp_tp);
+ mptcplog2((LOG_DEBUG, "%s: running %d\n", __func__,
+ mp_tp->mpt_timer_vals));
+
+ MPTE_LOCK_ASSERT_HELD(mpte);
+ MPT_LOCK(mp_tp);
+ switch (mp_tp->mpt_timer_vals) {
+ case MPTT_REXMT:
+ if (mp_tp->mpt_rxtstart == 0)
+ break;
+ if ((now_msecs - mp_tp->mpt_rxtstart) >
+ (mptcp_rto*hz)) {
+ if (MPTCP_SEQ_GT(mp_tp->mpt_snduna,
+ mp_tp->mpt_rtseq)) {
+ mp_tp->mpt_timer_vals = 0;
+ mp_tp->mpt_rtseq = 0;
+ break;
+ }
+ mp_tp->mpt_rxtshift++;
+ if (mp_tp->mpt_rxtshift > mptcp_nrtos) {
+ mp_tp->mpt_softerror = ETIMEDOUT;
+ DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
+ } else {
+ mp_tp->mpt_sndnxt = mp_tp->mpt_rtseq;
+ MPT_UNLOCK(mp_tp);
+ mptcplog((LOG_DEBUG, "%s: REXMT %d times.\n",
+ __func__, mp_tp->mpt_rxtshift));
+ mptcp_output(mpte);
+ MPT_LOCK(mp_tp);
+ }
+ } else {
+ resched_timer = 1;
+ }
+ break;
+ case MPTT_TW:
+ /* Allows for break before make XXX */
+ if (mp_tp->mpt_timewait == 0)
+ VERIFY(0);
+ if ((now_msecs - mp_tp->mpt_timewait) >
+ (mptcp_tw * hz)) {
+ mp_tp->mpt_softerror = ETIMEDOUT;
+ DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
+ } else {
+ resched_timer = 1;
+ }
+ break;
+ case MPTT_FASTCLOSE:
+ /* TODO XXX */
+ break;
+ default:
+ break;
+ }
+ MPT_UNLOCK(mp_tp);
+
+ return (resched_timer);
+}
+
+uint32_t
+mptcp_timer(struct mppcbinfo *mppi)
+{
+ struct mppcb *mpp, *tmpp;
+ struct timeval now;
+ u_int32_t now_msecs;
+ uint32_t resched_timer = 0;
+
+ lck_mtx_assert(&mppi->mppi_lock, LCK_MTX_ASSERT_OWNED);
+
+ microuptime(&now);
+ now_msecs = TIMEVAL_TO_HZ(now);
+ TAILQ_FOREACH_SAFE(mpp, &mppi->mppi_pcbs, mpp_entry, tmpp) {
+ struct socket *mp_so;
+ struct mptses *mpte;
+
+ mp_so = mpp->mpp_socket;
+ VERIFY(mp_so != NULL);
+ mpte = mptompte(mpp);
+ VERIFY(mpte != NULL);
+ MPTE_LOCK(mpte);
+ VERIFY(mpp->mpp_flags & MPP_ATTACHED);
+
+ if (mpp->mpp_flags & MPP_DEFUNCT) {
+ MPTE_UNLOCK(mpte);
+ continue;
+ }
+
+ if (mptcp_timer_demux(mpte, now_msecs))
+ resched_timer = 1;
+ MPTE_UNLOCK(mpte);
+ }
+
+ return (resched_timer);
+}
+
+void
+mptcp_start_timer(struct mptcb *mp_tp, int timer_type)
+{
+ struct timeval now;
+
+ microuptime(&now);
+
+ MPT_LOCK_ASSERT_HELD(mp_tp);
+
+ DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
+ mptcplog((LOG_DEBUG, "%s %d\n", __func__, timer_type));
+
+ switch (timer_type) {
+ case MPTT_REXMT:
+ mp_tp->mpt_timer_vals |= MPTT_REXMT;
+ mp_tp->mpt_rxtstart = TIMEVAL_TO_HZ(now);
+ mp_tp->mpt_rxtshift = 0;
+ mp_tp->mpt_rtseq = mp_tp->mpt_sndnxt;
+ break;
+ case MPTT_TW:
+ mp_tp->mpt_timer_vals |= MPTT_TW;
+ mp_tp->mpt_timewait = TIMEVAL_TO_HZ(now);
+ break;
+ case MPTT_FASTCLOSE:
+ /* NO-OP */
+ break;
+ default:
+ VERIFY(0);
+ /* NOTREACHED */
+ }
+ mptcp_timer_sched();
+}
+
+void
+mptcp_cancel_timer(struct mptcb *mp_tp, int timer_type)
+{
+ MPT_LOCK_ASSERT_HELD(mp_tp);
+
+ DTRACE_MPTCP2(cancel__timer, struct mptcb *, mp_tp, int, timer_type);
+ mptcplog3((LOG_DEBUG, "%s %d\n", __func__, timer_type));
+
+ switch (timer_type) {
+ case MPTT_REXMT:
+ mp_tp->mpt_rxtstart = 0;
+ mp_tp->mpt_rxtshift = 0;
+ mp_tp->mpt_timer_vals = 0;
+ break;
+ case MPTT_TW:
+ /* NO-OP */
+ break;
+ case MPTT_FASTCLOSE:
+ /* NO-OP */
+ break;
+ default:
+ break;
+ }
+}
+
+void
+mptcp_cancel_all_timers(struct mptcb *mp_tp)
+{
+ mptcp_cancel_timer(mp_tp, MPTT_REXMT);
+ mptcp_cancel_timer(mp_tp, MPTT_TW);
+ mptcp_cancel_timer(mp_tp, MPTT_FASTCLOSE);
+}
projects / apple / xnu.git / blobdiff