[apple/xnu.git] / bsd / netinet / mptcp_timer.c

/*
 * Copyright (c) 2012-2017 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);

	mpte_lock_assert_held(mpte);
	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;
				os_log_info(mptcp_log_handle,
				    "%s: REXMT %d sndnxt %u\n",
				    __func__, mp_tp->mpt_rxtshift,
				    (uint32_t)mp_tp->mpt_sndnxt);
				mptcp_output(mpte);
			}
		} 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;
	}

	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 (mptcp_timer_demux(mpte, now_msecs)) {
			resched_timer = 1;
		}
		mpte_unlock(mpte);
	}

	return resched_timer;
}

void
mptcp_start_timer(struct mptses *mpte, int timer_type)
{
	struct timeval now;
	struct mptcb *mp_tp = mpte->mpte_mptcb;

	microuptime(&now);

	DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
	mptcplog((LOG_DEBUG, "MPTCP Socket: %s: %d\n", __func__, timer_type),
	    MPTCP_SOCKET_DBG, MPTCP_LOGLVL_VERBOSE);

	mpte_lock_assert_held(mpte);

	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:
		/* XXX: Not implemented yet */
		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)
{
	mpte_lock_assert_held(mp_tp->mpt_mpte);
	DTRACE_MPTCP2(cancel__timer, struct mptcb *, mp_tp, int, 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);
}
Commit	Line	Data
39236c6e	1	/*
5ba3f43e	2	* Copyright (c) 2012-2017 Apple Inc. All rights reserved.
39236c6e A	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <sys/param.h>
	30	#include <sys/systm.h>
	31	#include <sys/kernel.h>
	32	#include <sys/mcache.h>
	33	#include <sys/socket.h>
	34	#include <sys/socketvar.h>
	35	#include <sys/syslog.h>
	36	#include <sys/protosw.h>
	37	#include <sys/sysctl.h>
	38
	39	#include <mach/sdt.h>
	40
	41	#include <netinet/mp_pcb.h>
	42	#include <netinet/mptcp_var.h>
	43	#include <netinet/mptcp_timer.h>
	44	#include <netinet/mptcp_seq.h>
	45
	46	#include <kern/locks.h>
	47
	48	/*
	49	* MPTCP Retransmission Timer comes into play only when subflow level
	50	* data is acked, but Data ACK is not received. Time is in seconds.
	51	*/
	52	static u_int32_t mptcp_rto = 3;
	53	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, rto, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	54	&mptcp_rto, 0, "MPTCP Retransmission Timeout");
39236c6e A	55
	56	static int mptcp_nrtos = 3;
	57	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, nrto, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	58	&mptcp_rto, 0, "MPTCP Retransmissions");
39236c6e A	59
	60	/*
	61	* MPTCP connections timewait interval in seconds.
	62	*/
	63	static u_int32_t mptcp_tw = 60;
	64	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, tw, CTLFLAG_RW \| CTLFLAG_LOCKED,
0a7de745	65	&mptcp_tw, 0, "MPTCP Timewait Period");
39236c6e	66
0a7de745	67	#define TIMEVAL_TO_HZ(_tv_) ((_tv_).tv_sec * hz + (_tv_).tv_usec / hz)
39236c6e A	68
	69	static int
	70	mptcp_timer_demux(struct mptses *mpte, uint32_t now_msecs)
	71	{
	72	struct mptcb *mp_tp = NULL;
	73	mp_tp = mpte->mpte_mptcb;
	74	int resched_timer = 0;
	75
	76	DTRACE_MPTCP2(timer, struct mptses , mpte, struct mptcb , mp_tp);
39236c6e	77
5ba3f43e	78	mpte_lock_assert_held(mpte);
39236c6e A	79	switch (mp_tp->mpt_timer_vals) {
39236c6e A	80	case MPTT_REXMT:
0a7de745	81	if (mp_tp->mpt_rxtstart == 0) {
39236c6e	82	break;
0a7de745	83	}
39236c6e	84	if ((now_msecs - mp_tp->mpt_rxtstart) >
0a7de745	85	(mptcp_rto * hz)) {
a39ff7e2	86	if (MPTCP_SEQ_GT(mp_tp->mpt_snduna, mp_tp->mpt_rtseq)) {
39236c6e A	87	mp_tp->mpt_timer_vals = 0;
	88	mp_tp->mpt_rtseq = 0;
	89	break;
	90	}
	91	mp_tp->mpt_rxtshift++;
	92	if (mp_tp->mpt_rxtshift > mptcp_nrtos) {
	93	mp_tp->mpt_softerror = ETIMEDOUT;
	94	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
	95	} else {
	96	mp_tp->mpt_sndnxt = mp_tp->mpt_rtseq;
a39ff7e2	97	os_log_info(mptcp_log_handle,
0a7de745 A	98	"%s: REXMT %d sndnxt %u\n",
	99	__func__, mp_tp->mpt_rxtshift,
	100	(uint32_t)mp_tp->mpt_sndnxt);
39236c6e	101	mptcp_output(mpte);
39236c6e A	102	}
	103	} else {
	104	resched_timer = 1;
	105	}
	106	break;
	107	case MPTT_TW:
	108	/* Allows for break before make XXX */
0a7de745	109	if (mp_tp->mpt_timewait == 0) {
39236c6e	110	VERIFY(0);
0a7de745	111	}
39236c6e A	112	if ((now_msecs - mp_tp->mpt_timewait) >
	113	(mptcp_tw * hz)) {
	114	mp_tp->mpt_softerror = ETIMEDOUT;
	115	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
	116	} else {
	117	resched_timer = 1;
	118	}
	119	break;
	120	case MPTT_FASTCLOSE:
	121	/* TODO XXX */
	122	break;
	123	default:
	124	break;
	125	}
39236c6e	126
0a7de745	127	return resched_timer;
39236c6e A	128	}
	129
	130	uint32_t
	131	mptcp_timer(struct mppcbinfo *mppi)
	132	{
	133	struct mppcb mpp, tmpp;
	134	struct timeval now;
	135	u_int32_t now_msecs;
	136	uint32_t resched_timer = 0;
	137
5ba3f43e	138	LCK_MTX_ASSERT(&mppi->mppi_lock, LCK_MTX_ASSERT_OWNED);
39236c6e A	139
	140	microuptime(&now);
	141	now_msecs = TIMEVAL_TO_HZ(now);
	142	TAILQ_FOREACH_SAFE(mpp, &mppi->mppi_pcbs, mpp_entry, tmpp) {
	143	struct socket *mp_so;
	144	struct mptses *mpte;
	145
	146	mp_so = mpp->mpp_socket;
	147	VERIFY(mp_so != NULL);
	148	mpte = mptompte(mpp);
	149	VERIFY(mpte != NULL);
5ba3f43e	150	mpte_lock(mpte);
39236c6e	151	VERIFY(mpp->mpp_flags & MPP_ATTACHED);
39037602	152
0a7de745	153	if (mptcp_timer_demux(mpte, now_msecs)) {
39236c6e	154	resched_timer = 1;
0a7de745	155	}
5ba3f43e	156	mpte_unlock(mpte);
39236c6e A	157	}
39236c6e A	158
0a7de745	159	return resched_timer;
39236c6e A	160	}
	161
	162	void
3e170ce0	163	mptcp_start_timer(struct mptses *mpte, int timer_type)
39236c6e A	164	{
39236c6e A	165	struct timeval now;
3e170ce0	166	struct mptcb *mp_tp = mpte->mpte_mptcb;
39236c6e A	167
	168	microuptime(&now);
	169
39236c6e	170	DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
3e170ce0 A	171	mptcplog((LOG_DEBUG, "MPTCP Socket: %s: %d\n", __func__, timer_type),
3e170ce0 A	172	MPTCP_SOCKET_DBG, MPTCP_LOGLVL_VERBOSE);
39236c6e	173
5ba3f43e A	174	mpte_lock_assert_held(mpte);
5ba3f43e A	175
39236c6e A	176	switch (timer_type) {
	177	case MPTT_REXMT:
	178	mp_tp->mpt_timer_vals \|= MPTT_REXMT;
	179	mp_tp->mpt_rxtstart = TIMEVAL_TO_HZ(now);
	180	mp_tp->mpt_rxtshift = 0;
	181	mp_tp->mpt_rtseq = mp_tp->mpt_sndnxt;
	182	break;
	183	case MPTT_TW:
3e170ce0	184	/* XXX: Not implemented yet */
39236c6e A	185	mp_tp->mpt_timer_vals \|= MPTT_TW;
	186	mp_tp->mpt_timewait = TIMEVAL_TO_HZ(now);
	187	break;
	188	case MPTT_FASTCLOSE:
	189	/* NO-OP */
	190	break;
	191	default:
	192	VERIFY(0);
	193	/* NOTREACHED */
	194	}
	195	mptcp_timer_sched();
	196	}
	197
	198	void
	199	mptcp_cancel_timer(struct mptcb *mp_tp, int timer_type)
	200	{
5ba3f43e	201	mpte_lock_assert_held(mp_tp->mpt_mpte);
39236c6e	202	DTRACE_MPTCP2(cancel__timer, struct mptcb *, mp_tp, int, timer_type);
39236c6e A	203
	204	switch (timer_type) {
	205	case MPTT_REXMT:
	206	mp_tp->mpt_rxtstart = 0;
	207	mp_tp->mpt_rxtshift = 0;
	208	mp_tp->mpt_timer_vals = 0;
	209	break;
	210	case MPTT_TW:
	211	/* NO-OP */
	212	break;
	213	case MPTT_FASTCLOSE:
	214	/* NO-OP */
	215	break;
	216	default:
	217	break;
	218	}
	219	}
	220
	221	void
	222	mptcp_cancel_all_timers(struct mptcb *mp_tp)
	223	{
	224	mptcp_cancel_timer(mp_tp, MPTT_REXMT);
	225	mptcp_cancel_timer(mp_tp, MPTT_TW);
	226	mptcp_cancel_timer(mp_tp, MPTT_FASTCLOSE);
	227	}