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

/*
 * 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);
}
Commit	Line	Data
39236c6e A	1	/*
	2	* Copyright (c) 2012-2013 Apple Inc. All rights reserved.
	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,
	54	&mptcp_rto, 0, "MPTCP Retransmission Timeout");
	55
	56	static int mptcp_nrtos = 3;
	57	SYSCTL_INT(_net_inet_mptcp, OID_AUTO, nrto, CTLFLAG_RW \| CTLFLAG_LOCKED,
	58	&mptcp_rto, 0, "MPTCP Retransmissions");
	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,
65	&mptcp_tw, 0, "MPTCP Timewait Period");
66
67	#define TIMEVAL_TO_HZ(_tv_) ((_tv_).tv_sec * hz + (_tv_).tv_usec / hz)
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);
77	mptcplog2((LOG_DEBUG, "%s: running %d\n", __func__,
78	mp_tp->mpt_timer_vals));
79
80	MPTE_LOCK_ASSERT_HELD(mpte);
81	MPT_LOCK(mp_tp);
82	switch (mp_tp->mpt_timer_vals) {
83	case MPTT_REXMT:
84	if (mp_tp->mpt_rxtstart == 0)
85	break;
86	if ((now_msecs - mp_tp->mpt_rxtstart) >
87	(mptcp_rto*hz)) {
88	if (MPTCP_SEQ_GT(mp_tp->mpt_snduna,
89	mp_tp->mpt_rtseq)) {
90	mp_tp->mpt_timer_vals = 0;
91	mp_tp->mpt_rtseq = 0;
92	break;
93	}
94	mp_tp->mpt_rxtshift++;
95	if (mp_tp->mpt_rxtshift > mptcp_nrtos) {
96	mp_tp->mpt_softerror = ETIMEDOUT;
97	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
98	} else {
99	mp_tp->mpt_sndnxt = mp_tp->mpt_rtseq;
100	MPT_UNLOCK(mp_tp);
101	mptcplog((LOG_DEBUG, "%s: REXMT %d times.\n",
102	__func__, mp_tp->mpt_rxtshift));
103	mptcp_output(mpte);
104	MPT_LOCK(mp_tp);
105	}
106	} else {
107	resched_timer = 1;
108	}
109	break;
110	case MPTT_TW:
111	/* Allows for break before make XXX */
112	if (mp_tp->mpt_timewait == 0)
113	VERIFY(0);
114	if ((now_msecs - mp_tp->mpt_timewait) >
115	(mptcp_tw * hz)) {
116	mp_tp->mpt_softerror = ETIMEDOUT;
117	DTRACE_MPTCP1(error, struct mptcb *, mp_tp);
118	} else {
119	resched_timer = 1;
120	}
121	break;
122	case MPTT_FASTCLOSE:
123	/* TODO XXX */
124	break;
125	default:
126	break;
127	}
128	MPT_UNLOCK(mp_tp);
129
130	return (resched_timer);
131	}
132
133	uint32_t
134	mptcp_timer(struct mppcbinfo *mppi)
135	{
136	struct mppcb mpp, tmpp;
137	struct timeval now;
138	u_int32_t now_msecs;
139	uint32_t resched_timer = 0;
140
141	lck_mtx_assert(&mppi->mppi_lock, LCK_MTX_ASSERT_OWNED);
142
143	microuptime(&now);
144	now_msecs = TIMEVAL_TO_HZ(now);
145	TAILQ_FOREACH_SAFE(mpp, &mppi->mppi_pcbs, mpp_entry, tmpp) {
146	struct socket *mp_so;
147	struct mptses *mpte;
148
149	mp_so = mpp->mpp_socket;
150	VERIFY(mp_so != NULL);
151	mpte = mptompte(mpp);
152	VERIFY(mpte != NULL);
153	MPTE_LOCK(mpte);
154	VERIFY(mpp->mpp_flags & MPP_ATTACHED);
155
156	if (mpp->mpp_flags & MPP_DEFUNCT) {
157	MPTE_UNLOCK(mpte);
158	continue;
159	}
160
161	if (mptcp_timer_demux(mpte, now_msecs))
162	resched_timer = 1;
163	MPTE_UNLOCK(mpte);
164	}
165
166	return (resched_timer);
167	}
168
169	void
170	mptcp_start_timer(struct mptcb *mp_tp, int timer_type)
171	{
172	struct timeval now;
173
174	microuptime(&now);
175
176	MPT_LOCK_ASSERT_HELD(mp_tp);
177
178	DTRACE_MPTCP2(start__timer, struct mptcb *, mp_tp, int, timer_type);
179	mptcplog((LOG_DEBUG, "%s %d\n", __func__, timer_type));
180
181	switch (timer_type) {
182	case MPTT_REXMT:
183	mp_tp->mpt_timer_vals \|= MPTT_REXMT;
184	mp_tp->mpt_rxtstart = TIMEVAL_TO_HZ(now);
185	mp_tp->mpt_rxtshift = 0;
186	mp_tp->mpt_rtseq = mp_tp->mpt_sndnxt;
187	break;
188	case MPTT_TW:
189	mp_tp->mpt_timer_vals \|= MPTT_TW;
190	mp_tp->mpt_timewait = TIMEVAL_TO_HZ(now);
191	break;
192	case MPTT_FASTCLOSE:
193	/* NO-OP */
194	break;
195	default:
196	VERIFY(0);
197	/* NOTREACHED */
198	}
199	mptcp_timer_sched();
200	}
201
202	void
203	mptcp_cancel_timer(struct mptcb *mp_tp, int timer_type)
204	{
205	MPT_LOCK_ASSERT_HELD(mp_tp);
206
207	DTRACE_MPTCP2(cancel__timer, struct mptcb *, mp_tp, int, timer_type);
208	mptcplog3((LOG_DEBUG, "%s %d\n", __func__, timer_type));
209
210	switch (timer_type) {
211	case MPTT_REXMT:
212	mp_tp->mpt_rxtstart = 0;
213	mp_tp->mpt_rxtshift = 0;
214	mp_tp->mpt_timer_vals = 0;
215	break;
216	case MPTT_TW:
217	/* NO-OP */
218	break;
219	case MPTT_FASTCLOSE:
220	/* NO-OP */
221	break;
222	default:
223	break;
224	}
225	}
226
227	void
228	mptcp_cancel_all_timers(struct mptcb *mp_tp)
229	{
230	mptcp_cancel_timer(mp_tp, MPTT_REXMT);
231	mptcp_cancel_timer(mp_tp, MPTT_TW);
232	mptcp_cancel_timer(mp_tp, MPTT_FASTCLOSE);
233	}