* Copyright (c) 2000-2014 Apple Computer, 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
* 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,
* 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@
*/
/*
#endif /* BSD_KERNEL_PRIVATE */
/* Keep the external definition the same for binary compatibility */
-#define TCPT_NTIMERS_EXT 4
+#define TCPT_NTIMERS_EXT 4
/*
* Definitions of the TCP timers.
* timeout will send the last unacknowledged segment to generate more acks
* with SACK information which can be used for fast-retransmiting the lost
* packets. This will fire in the order of 10ms.
- *
+ *
* The TCPT_REXMT timer is used to force retransmissions.
* The TCP has the TCPT_REXMT timer set whenever segments
* have been sent for which ACKs are expected but not yet
* a window update from the peer.
*
* The TCPT_KEEP timer is used to keep connections alive. If an
- * connection is idle (no segments received) for TCPTV_KEEP_INIT amount
+ * connection is idle (no segments received) for TCPTV_KEEP_INIT amount
* of time, but not yet established, then we drop the connection.
* Once the connection is established, if the connection is idle for
* TCPTV_KEEP_IDLE time (and keepalives have been enabled on the socket),
*/
#ifdef BSD_KERNEL_PRIVATE
-#define TCPT_PTO 0 /* Probe timeout */
-#define TCPT_DELAYFR 1 /* Delay recovery if there is reordering */
-#define TCPT_REXMT 2 /* retransmit */
-#define TCPT_DELACK 3 /* delayed ack */
-#define TCPT_PERSIST 4 /* retransmit persistence */
-#define TCPT_KEEP 5 /* keep alive */
-#define TCPT_2MSL 6 /* 2*msl quiet time timer */
+#define TCPT_PTO 0 /* Probe timeout */
+#define TCPT_DELAYFR 1 /* Delay recovery if there is reordering */
+#define TCPT_REXMT 2 /* retransmit */
+#define TCPT_DELACK 3 /* delayed ack */
+#define TCPT_PERSIST 4 /* retransmit persistence */
+#define TCPT_KEEP 5 /* keep alive */
+#define TCPT_2MSL 6 /* 2*msl quiet time timer */
#if MPTCP
-#define TCPT_JACK_RXMT 7 /* retransmit timer for join ack */
-#define TCPT_MAX 7
+#define TCPT_JACK_RXMT 7 /* retransmit timer for join ack */
+#define TCPT_MAX 7
#else /* MPTCP */
-#define TCPT_MAX 6
+#define TCPT_MAX 6
#endif /* !MPTCP */
-#define TCPT_NONE (TCPT_MAX + 1)
-#define TCPT_NTIMERS (TCPT_MAX + 1)
+#define TCPT_NONE (TCPT_MAX + 1)
+#define TCPT_NTIMERS (TCPT_MAX + 1)
/* External definitions */
-#define TCPT_REXMT_EXT 0
-#define TCPT_PERSIST_EXT 1
-#define TCPT_KEEP_EXT 2
-#define TCPT_2MSL_EXT 3
-#define TCPT_DELACK_EXT 4
+#define TCPT_REXMT_EXT 0
+#define TCPT_PERSIST_EXT 1
+#define TCPT_KEEP_EXT 2
+#define TCPT_2MSL_EXT 3
+#define TCPT_DELACK_EXT 4
#else /* !BSD_KERNEL_PRIVATE */
-#define TCPT_REXMT 0 /* retransmit */
-#define TCPT_PERSIST 1 /* retransmit persistence */
-#define TCPT_KEEP 2 /* keep alive */
-#define TCPT_2MSL 3 /* 2*msl quiet time timer */
-#define TCPT_DELACK 4 /* delayed ack timer */
+#define TCPT_REXMT 0 /* retransmit */
+#define TCPT_PERSIST 1 /* retransmit persistence */
+#define TCPT_KEEP 2 /* keep alive */
+#define TCPT_2MSL 3 /* 2*msl quiet time timer */
+#define TCPT_DELACK 4 /* delayed ack timer */
#if MPTCP
-#define TCPT_JACK_RXMT 5 /* retransmit timer for join ack */
-#define TCPT_MAX 5
+#define TCPT_JACK_RXMT 5 /* retransmit timer for join ack */
+#define TCPT_MAX 5
#else /* MPTCP */
-#define TCPT_MAX 4
+#define TCPT_MAX 4
#endif /* !MPTCP */
-#define TCPT_NONE (TCPT_MAX + 1)
-#define TCPT_NTIMERS (TCPT_MAX + 1)
+#define TCPT_NONE (TCPT_MAX + 1)
+#define TCPT_NTIMERS (TCPT_MAX + 1)
#endif /* BSD_KERNEL_PRIVATE */
/*
* Time constants.
*/
-#define TCPTV_MSL ( 15*TCP_RETRANSHZ) /* max seg lifetime */
-#define TCPTV_SRTTBASE 0 /* base roundtrip time; if 0, no idea yet */
-#define TCPTV_RTOBASE ( 1*TCP_RETRANSHZ) /* assumed RTO if no info */
-#define TCPTV_SRTTDFLT ( 1*TCP_RETRANSHZ) /* assumed RTT if no info */
-#define TCPTV_PERSMIN ( 5*TCP_RETRANSHZ) /* retransmit persistence */
-#define TCPTV_PERSMAX ( 60*TCP_RETRANSHZ) /* maximum persist interval */
+#define TCPTV_MSL ( 15*TCP_RETRANSHZ) /* max seg lifetime */
+#define TCPTV_SRTTBASE 0 /* base roundtrip time; if 0, no idea yet */
+#define TCPTV_RTOBASE ( 1*TCP_RETRANSHZ) /* assumed RTO if no info */
+#define TCPTV_SRTTDFLT ( 1*TCP_RETRANSHZ) /* assumed RTT if no info */
+#define TCPTV_PERSMIN ( 5*TCP_RETRANSHZ) /* retransmit persistence */
+#define TCPTV_PERSMAX ( 60*TCP_RETRANSHZ) /* maximum persist interval */
extern int tcptv_persmin_val;
-#define TCPTV_KEEP_INIT ( 75*TCP_RETRANSHZ) /* connect keep alive */
-#define TCPTV_KEEP_IDLE (120*60*TCP_RETRANSHZ) /* time before probing */
-#define TCPTV_KEEPINTVL ( 75*TCP_RETRANSHZ) /* default probe interval */
-#define TCPTV_KEEPCNT 8 /* max probes before drop */
+#define TCPTV_KEEP_INIT ( 75*TCP_RETRANSHZ) /* connect keep alive */
+#define TCPTV_KEEP_IDLE (120*60*TCP_RETRANSHZ) /* time before probing */
+#define TCPTV_KEEPINTVL ( 75*TCP_RETRANSHZ) /* default probe interval */
+#define TCPTV_KEEPCNT 8 /* max probes before drop */
-#define TCPTV_REXMTMAX ( 64*TCP_RETRANSHZ ) /* max REXMT value */
-#define TCPTV_REXMTMIN ( TCP_RETRANSHZ/33 ) /* min REXMT for non-local connections */
+#define TCPTV_REXMTMAX ( 64*TCP_RETRANSHZ ) /* max REXMT value */
+#define TCPTV_REXMTMIN ( TCP_RETRANSHZ/33 ) /* min REXMT for non-local connections */
/*
* Window for counting received bytes to see if ack-stretching
* can start (default 100 ms)
- */
-#define TCPTV_UNACKWIN ( TCP_RETRANSHZ/10 )
+ */
+#define TCPTV_UNACKWIN ( TCP_RETRANSHZ/10 )
-/* Receiver idle time, avoid ack-stretching after this idle time */
+/* Receiver idle time, avoid ack-stretching after this idle time */
#define TCPTV_MAXRCVIDLE (TCP_RETRANSHZ/5 )
/*
* No ack stretching during slow-start, until we see some packets.
- * By the time the receiver gets 512 packets, the senders cwnd
- * should open by a few hundred packets consdering the
+ * By the time the receiver gets 512 packets, the senders cwnd
+ * should open by a few hundred packets consdering the
* slow-start progression.
*/
#define TCP_RCV_SS_PKTCOUNT 512
/* Receiver idle time, for rcv socket buffer resizing */
#define TCPTV_RCVBUFIDLE (TCP_RETRANSHZ/2)
-#define TCPTV_TWTRUNC 8 /* RTO factor to truncate TW */
+#define TCPTV_TWTRUNC 8 /* RTO factor to truncate TW */
-#define TCP_LINGERTIME 120 /* linger at most 2 minutes */
+#define TCP_LINGERTIME 120 /* linger at most 2 minutes */
-#define TCP_MAXRXTSHIFT 12 /* maximum retransmits */
+#define TCP_MAXRXTSHIFT 12 /* maximum retransmits */
-#ifdef TCPTIMERS
+#ifdef TCPTIMERS
static char *tcptimers[] =
- { "REXMT", "PERSIST", "KEEP", "2MSL" , "DELACK"};
+{ "REXMT", "PERSIST", "KEEP", "2MSL", "DELACK"};
#endif /* TCPTIMERS */
/*
* Persist, keep, 2msl and MPTCP's join-ack timer as slow timers which can
* be coalesced at a higher granularity (500 ms).
*
- * Rexmt and delayed ack timers are considered as fast timers which run
+ * Rexmt and delayed ack timers are considered as fast timers which run
* in the order of 100ms.
*
* Probe timeout is a quick timer which will run in the order of 10ms.
*/
-#define IS_TIMER_HZ_500MS(i) ((i) >= TCPT_PERSIST)
-#define IS_TIMER_HZ_100MS(i) ((i) >= TCPT_REXMT && (i) < TCPT_PERSIST)
-#define IS_TIMER_HZ_10MS(i) ((i) < TCPT_REXMT)
+#define IS_TIMER_HZ_500MS(i) ((i) >= TCPT_PERSIST)
+#define IS_TIMER_HZ_100MS(i) ((i) >= TCPT_REXMT && (i) < TCPT_PERSIST)
+#define IS_TIMER_HZ_10MS(i) ((i) < TCPT_REXMT)
struct tcptimerlist;
struct tcptimerentry {
- LIST_ENTRY(tcptimerentry) le; /* links for timer list */
- uint32_t timer_start; /* tcp clock when the timer was started */
- uint16_t index; /* index of lowest timer that needs to run first */
- uint16_t mode; /* Bit-wise OR of timers that are active */
- uint32_t runtime; /* deadline at which the first timer has to fire */
+ LIST_ENTRY(tcptimerentry) le; /* links for timer list */
+ uint32_t timer_start; /* tcp clock when the timer was started */
+ uint16_t index; /* index of lowest timer that needs to run first */
+ uint16_t mode; /* Bit-wise OR of timers that are active */
+ uint32_t runtime; /* deadline at which the first timer has to fire */
};
LIST_HEAD(timerlisthead, tcptimerentry);
struct tcptimerlist {
- struct timerlisthead lhead; /* head of the list */
- lck_mtx_t *mtx; /* lock to protect the list */
- lck_attr_t *mtx_attr; /* mutex attributes */
- lck_grp_t *mtx_grp; /* mutex group definition */
- lck_grp_attr_t *mtx_grp_attr; /* mutex group attributes */
- thread_call_t call; /* call entry */
- uint32_t runtime; /* time at which this list is going to run */
- uint32_t schedtime; /* time at which this list was scheduled */
- uint32_t entries; /* Number of entries on the list */
- uint32_t maxentries; /* Max number of entries at any time */
+ struct timerlisthead lhead; /* head of the list */
+ lck_mtx_t *mtx; /* lock to protect the list */
+ lck_attr_t *mtx_attr; /* mutex attributes */
+ lck_grp_t *mtx_grp; /* mutex group definition */
+ lck_grp_attr_t *mtx_grp_attr; /* mutex group attributes */
+ thread_call_t call; /* call entry */
+ uint32_t runtime; /* time at which this list is going to run */
+ uint32_t schedtime; /* time at which this list was scheduled */
+ uint32_t entries; /* Number of entries on the list */
+ uint32_t maxentries; /* Max number of entries at any time */
/* Set desired mode when timer list running */
- boolean_t running; /* Set when timer list is being processed */
- boolean_t scheduled; /* set when the timer is scheduled */
+ boolean_t running; /* Set when timer list is being processed */
+ boolean_t scheduled; /* set when the timer is scheduled */
#define TCP_TIMERLIST_10MS_MODE 0x1
#define TCP_TIMERLIST_100MS_MODE 0x2
#define TCP_TIMERLIST_500MS_MODE 0x4
- uint32_t mode; /* Current mode of the timer */
- uint32_t pref_mode; /* Preferred mode set by a connection */
- uint32_t pref_offset; /* Preferred offset set by a connection */
- uint32_t idleruns; /* Number of times the list has been idle in fast mode */
- struct tcptimerentry *next_te; /* next timer entry pointer to process */
+ uint32_t mode; /* Current mode of the timer */
+ uint32_t pref_mode; /* Preferred mode set by a connection */
+ uint32_t pref_offset; /* Preferred offset set by a connection */
+ uint32_t idleruns; /* Number of times the list has been idle in fast mode */
+ struct tcptimerentry *next_te; /* next timer entry pointer to process */
u_int16_t probe_if_index; /* Interface index that needs to send probes */
-
};
/* number of idle runs allowed for TCP timer list in fast or quick modes */
#define TCP_FASTMODE_IDLERUN_MAX 10
/*
- * Minimum retransmit timeout is set to 30ms. We add a slop of
- * 200 ms to the retransmit value to account for processing
- * variance and delayed ack. This extra 200ms will help to avoid
- * spurious retransmits by taking into consideration the receivers
- * that wait for delayed ack timer instead of generating an ack
+ * Minimum retransmit timeout is set to 30ms. We add a slop of
+ * 200 ms to the retransmit value to account for processing
+ * variance and delayed ack. This extra 200ms will help to avoid
+ * spurious retransmits by taking into consideration the receivers
+ * that wait for delayed ack timer instead of generating an ack
* for every two packets.
*
* On a local link, the minimum retransmit timeout is 100ms and
* variance is set to 0. This will make the sender a little bit more
* aggressive on local link. When the connection is not established yet,
* there is no need to add an extra 200ms to retransmit timeout because
- * the initial value is high (1s) and delayed ack is not a problem in
+ * the initial value is high (1s) and delayed ack is not a problem in
* that case.
*/
-#define TCPTV_REXMTSLOP ( TCP_RETRANSHZ/5 ) /* extra 200 ms slop */
+#define TCPTV_REXMTSLOP ( TCP_RETRANSHZ/5 ) /* extra 200 ms slop */
/* macro to decide when retransmit slop (described above) should be added */
-#define TCP_ADD_REXMTSLOP(tp) (tp->t_state >= TCPS_ESTABLISHED)
+#define TCP_ADD_REXMTSLOP(tp) (tp->t_state >= TCPS_ESTABLISHED)
-#define TCPT_RANGESET(tv, value, tvmin, tvmax, addslop) do { \
+#define TCPT_RANGESET(tv, value, tvmin, tvmax, addslop) do { \
(tv) = ((addslop) ? tcp_rexmt_slop : 0) + (value); \
if ((uint32_t)(tv) < (uint32_t)(tvmin)) \
- (tv) = (tvmin); \
+ (tv) = (tvmin); \
else if ((uint32_t)(tv) > (uint32_t)(tvmax)) \
- (tv) = (tvmax); \
+ (tv) = (tvmax); \
} while(0)
#define TCP_CONN_KEEPIDLE(tp) \
((tp)->t_keepidle && \
((tp)->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) ? \
- (tp)->t_keepidle : tcp_keepidle)
+ (tp)->t_keepidle : tcp_keepidle)
#define TCP_CONN_KEEPINIT(tp) \
(((tp)->t_keepinit > 0) ? (tp)->t_keepinit : tcp_keepinit)
#define TCP_CONN_KEEPCNT(tp) \
TAILQ_HEAD(tcptailq, tcpcb);
-extern int tcp_keepinit; /* time to establish connection */
-extern int tcp_keepidle; /* time before keepalive probes begin */
-extern int tcp_keepintvl; /* time between keepalive probes */
-extern int tcp_keepcnt; /* number of keepalives */
-extern int tcp_delack; /* delayed ack timer */
+extern int tcp_keepinit; /* time to establish connection */
+extern int tcp_keepidle; /* time before keepalive probes begin */
+extern int tcp_keepintvl; /* time between keepalive probes */
+extern int tcp_keepcnt; /* number of keepalives */
+extern int tcp_delack; /* delayed ack timer */
extern int tcp_maxpersistidle;
extern int tcp_msl;
-extern int tcp_ttl; /* time to live for TCP segs */
+extern int tcp_ttl; /* time to live for TCP segs */
extern int tcp_backoff[];
extern int tcp_rexmt_slop;
-extern u_int32_t tcp_max_persist_timeout; /* Maximum persistence for Zero Window Probes */
+extern u_int32_t tcp_max_persist_timeout; /* Maximum persistence for Zero Window Probes */
#define OFFSET_FROM_START(tp, off) ((tcp_now + (off)) - (tp)->tentry.timer_start)
#endif /* BSD_KERNEL_PRIVATE */
#endif /* !_NETINET_TCP_TIMER_H_ */
-
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