/*
- * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2017 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
* 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@
*/
/*
#include <sys/mcache.h>
#include <sys/queue.h>
#include <kern/locks.h>
-#include <kern/cpu_number.h> /* before tcp_seq.h, for tcp_random18() */
+#include <kern/cpu_number.h> /* before tcp_seq.h, for tcp_random18() */
#include <mach/boolean.h>
#include <net/route.h>
#include <mach/sdt.h>
#include <netinet/mptcp_var.h>
-#define TIMERENTRY_TO_TP(te) ((struct tcpcb *)((uintptr_t)te - offsetof(struct tcpcb, tentry.le.le_next)))
-
-#define VERIFY_NEXT_LINK(elm,field) do { \
- if (LIST_NEXT((elm),field) != NULL && \
- LIST_NEXT((elm),field)->field.le_prev != \
- &((elm)->field.le_next)) \
- panic("Bad link elm %p next->prev != elm", (elm)); \
-} while(0)
-
-#define VERIFY_PREV_LINK(elm,field) do { \
- if (*(elm)->field.le_prev != (elm)) \
- panic("Bad link elm %p prev->next != elm", (elm)); \
-} while(0)
-
-#define TCP_SET_TIMER_MODE(mode, i) do { \
- if (IS_TIMER_HZ_10MS(i)) \
- (mode) |= TCP_TIMERLIST_10MS_MODE; \
- else if (IS_TIMER_HZ_100MS(i)) \
- (mode) |= TCP_TIMERLIST_100MS_MODE; \
- else \
- (mode) |= TCP_TIMERLIST_500MS_MODE; \
-} while(0)
-
/* Max number of times a stretch ack can be delayed on a connection */
-#define TCP_STRETCHACK_DELAY_THRESHOLD 5
+#define TCP_STRETCHACK_DELAY_THRESHOLD 5
/*
* If the host processor has been sleeping for too long, this is the threshold
* used to avoid sending stale retransmissions.
*/
-#define TCP_SLEEP_TOO_LONG (10 * 60 * 1000) /* 10 minutes in ms */
+#define TCP_SLEEP_TOO_LONG (10 * 60 * 1000) /* 10 minutes in ms */
/* tcp timer list */
struct tcptimerlist tcp_timer_list;
static int
sysctl_msec_to_ticks SYSCTL_HANDLER_ARGS
{
-#pragma unused(arg1, arg2)
+#pragma unused(arg2)
int error, s, tt;
- tt = *(int *)oidp->oid_arg1;
+ tt = *(int *)arg1;
s = tt * 1000 / TCP_RETRANSHZ;;
error = sysctl_handle_int(oidp, &s, 0, req);
- if (error || !req->newptr)
- return (error);
+ if (error || !req->newptr) {
+ return error;
+ }
tt = s * TCP_RETRANSHZ / 1000;
- if (tt < 1)
- return (EINVAL);
+ if (tt < 1) {
+ return EINVAL;
+ }
- *(int *)oidp->oid_arg1 = tt;
- return (0);
+ *(int *)arg1 = tt;
+ SYSCTL_SKMEM_UPDATE_AT_OFFSET(arg2, *(int*)arg1);
+ return 0;
}
-int tcp_keepinit;
+#if SYSCTL_SKMEM
+int tcp_keepinit = TCPTV_KEEP_INIT;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_keepinit, offsetof(skmem_sysctl, tcp.keepinit),
+ sysctl_msec_to_ticks, "I", "");
+
+int tcp_keepidle = TCPTV_KEEP_IDLE;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_keepidle, offsetof(skmem_sysctl, tcp.keepidle),
+ sysctl_msec_to_ticks, "I", "");
+
+int tcp_keepintvl = TCPTV_KEEPINTVL;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_keepintvl, offsetof(skmem_sysctl, tcp.keepintvl),
+ sysctl_msec_to_ticks, "I", "");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, keepcnt,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ int, tcp_keepcnt, TCPTV_KEEPCNT, "number of times to repeat keepalive");
+
+int tcp_msl = TCPTV_MSL;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_msl, offsetof(skmem_sysctl, tcp.msl),
+ sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
+#else /* SYSCTL_SKMEM */
+int tcp_keepinit;
SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "");
-int tcp_keepidle;
+int tcp_keepidle;
SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_keepidle, 0, sysctl_msec_to_ticks, "I", "");
-int tcp_keepintvl;
+int tcp_keepintvl;
SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "");
-int tcp_keepcnt;
+int tcp_keepcnt;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, keepcnt,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_keepcnt, 0, "number of times to repeat keepalive");
-int tcp_msl;
+int tcp_msl;
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_msl, 0, sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
+#endif /* SYSCTL_SKMEM */
-/*
+/*
* Avoid DoS via TCP Robustness in Persist Condition
* (see http://www.ietf.org/id/draft-ananth-tcpm-persist-02.txt)
* by allowing a system wide maximum persistence timeout value when in
* Expressed in milliseconds to be consistent without timeout related
* values, the TCP socket option is in seconds.
*/
+#if SYSCTL_SKMEM
u_int32_t tcp_max_persist_timeout = 0;
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, max_persist_timeout,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_max_persist_timeout, 0, sysctl_msec_to_ticks, "I",
+ &tcp_max_persist_timeout, offsetof(skmem_sysctl, tcp.max_persist_timeout),
+ sysctl_msec_to_ticks, "I", "Maximum persistence timeout for ZWP");
+#else /* SYSCTL_SKMEM */
+u_int32_t tcp_max_persist_timeout = 0;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, max_persist_timeout,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_max_persist_timeout, 0, sysctl_msec_to_ticks, "I",
"Maximum persistence timeout for ZWP");
+#endif /* SYSCTL_SKMEM */
-static int always_keepalive = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive,
- CTLFLAG_RW | CTLFLAG_LOCKED,
- &always_keepalive , 0, "Assume SO_KEEPALIVE on all TCP connections");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, always_keepalive,
+ CTLFLAG_RW | CTLFLAG_LOCKED, static int, always_keepalive, 0,
+ "Assume SO_KEEPALIVE on all TCP connections");
/*
* This parameter determines how long the timer list will stay in fast or
- * quick mode even though all connections are idle. In this state, the
+ * quick mode even though all connections are idle. In this state, the
* timer will run more frequently anticipating new data.
*/
-int timer_fastmode_idlemax = TCP_FASTMODE_IDLERUN_MAX;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, timer_fastmode_idlemax,
- CTLFLAG_RW | CTLFLAG_LOCKED,
- &timer_fastmode_idlemax, 0, "Maximum idle generations in fast mode");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, timer_fastmode_idlemax,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, timer_fastmode_idlemax,
+ TCP_FASTMODE_IDLERUN_MAX, "Maximum idle generations in fast mode");
/*
* See tcp_syn_backoff[] for interval values between SYN retransmits;
* SYN retransmits. Setting it to 0 disables the dropping off of those
* two options.
*/
-static int tcp_broken_peer_syn_rxmit_thres = 10;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, broken_peer_syn_rexmit_thres,
- CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_broken_peer_syn_rxmit_thres, 0,
- "Number of retransmitted SYNs before disabling RFC 1323 "
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, broken_peer_syn_rexmit_thres,
+ CTLFLAG_RW | CTLFLAG_LOCKED, static int, tcp_broken_peer_syn_rxmit_thres,
+ 10, "Number of retransmitted SYNs before disabling RFC 1323 "
"options on local connections");
static int tcp_timer_advanced = 0;
static int tcp_resched_timerlist = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcp_resched_timerlist,
- CTLFLAG_RD | CTLFLAG_LOCKED, &tcp_resched_timerlist, 0,
+ CTLFLAG_RD | CTLFLAG_LOCKED, &tcp_resched_timerlist, 0,
"Number of times timer list was rescheduled as part of processing a packet");
-int tcp_pmtud_black_hole_detect = 1 ;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_detection,
- CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_pmtud_black_hole_detect, 0,
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, pmtud_blackhole_detection,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_pmtud_black_hole_detect, 1,
"Path MTU Discovery Black Hole Detection");
-int tcp_pmtud_black_hole_mss = 1200 ;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_mss,
- CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_pmtud_black_hole_mss, 0,
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, pmtud_blackhole_mss,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_pmtud_black_hole_mss, 1200,
"Path MTU Discovery Black Hole Detection lowered MSS");
-#define TCP_REPORT_STATS_INTERVAL 43200 /* 12 hours, in seconds */
+static u_int32_t tcp_mss_rec_medium = 1200;
+static u_int32_t tcp_mss_rec_low = 512;
+
+#define TCP_REPORT_STATS_INTERVAL 43200 /* 12 hours, in seconds */
int tcp_report_stats_interval = TCP_REPORT_STATS_INTERVAL;
-#if (DEVELOPMENT || DEBUG)
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, report_stats_interval,
- CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_report_stats_interval, 0,
- "Report stats interval");
-#endif /* (DEVELOPMENT || DEBUG) */
/* performed garbage collection of "used" sockets */
static boolean_t tcp_gc_done = FALSE;
/* max idle probes */
-int tcp_maxpersistidle;
+int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
/*
* TCP delack timer is set to 100 ms. Since the processing of timer list
* in fast mode will happen no faster than 100 ms, the delayed ack timer
* will fire some where between 100 and 200 ms.
*/
-int tcp_delack = TCP_RETRANSHZ / 10;
+int tcp_delack = TCP_RETRANSHZ / 10;
#if MPTCP
/*
* MP_JOIN retransmission of 3rd ACK will be every 500 msecs without backoff
*/
-int tcp_jack_rxmt = TCP_RETRANSHZ / 2;
+int tcp_jack_rxmt = TCP_RETRANSHZ / 2;
#endif /* MPTCP */
static boolean_t tcp_itimer_done = FALSE;
static void tcp_sched_timers(struct tcpcb *tp);
static inline void tcp_set_lotimer_index(struct tcpcb *);
__private_extern__ void tcp_remove_from_time_wait(struct inpcb *inp);
+static inline void tcp_update_mss_core(struct tcpcb *tp, struct ifnet *ifp);
__private_extern__ void tcp_report_stats(void);
-/*
- * Macro to compare two timers. If there is a reset of the sign bit,
- * it is safe to assume that the timer has wrapped around. By doing
- * signed comparision, we take care of wrap around such that the value
- * with the sign bit reset is actually ahead of the other.
- */
-inline int32_t
-timer_diff(uint32_t t1, uint32_t toff1, uint32_t t2, uint32_t toff2) {
- return (int32_t)((t1 + toff1) - (t2 + toff2));
-};
-
-static u_int64_t tcp_last_report_time;
+static u_int64_t tcp_last_report_time;
/*
* Structure to store previously reported stats so that we can send
* incremental changes in each report interval.
*/
struct tcp_last_report_stats {
- u_int32_t tcps_connattempt;
- u_int32_t tcps_accepts;
- u_int32_t tcps_ecn_client_setup;
- u_int32_t tcps_ecn_server_setup;
- u_int32_t tcps_ecn_client_success;
- u_int32_t tcps_ecn_server_success;
- u_int32_t tcps_ecn_not_supported;
- u_int32_t tcps_ecn_lost_syn;
- u_int32_t tcps_ecn_lost_synack;
- u_int32_t tcps_ecn_recv_ce;
- u_int32_t tcps_ecn_recv_ece;
- u_int32_t tcps_ecn_sent_ece;
- u_int32_t tcps_ecn_conn_recv_ce;
- u_int32_t tcps_ecn_conn_recv_ece;
- u_int32_t tcps_ecn_conn_plnoce;
- u_int32_t tcps_ecn_conn_pl_ce;
- u_int32_t tcps_ecn_conn_nopl_ce;
+ u_int32_t tcps_connattempt;
+ u_int32_t tcps_accepts;
+ u_int32_t tcps_ecn_client_setup;
+ u_int32_t tcps_ecn_server_setup;
+ u_int32_t tcps_ecn_client_success;
+ u_int32_t tcps_ecn_server_success;
+ u_int32_t tcps_ecn_not_supported;
+ u_int32_t tcps_ecn_lost_syn;
+ u_int32_t tcps_ecn_lost_synack;
+ u_int32_t tcps_ecn_recv_ce;
+ u_int32_t tcps_ecn_recv_ece;
+ u_int32_t tcps_ecn_sent_ece;
+ u_int32_t tcps_ecn_conn_recv_ce;
+ u_int32_t tcps_ecn_conn_recv_ece;
+ u_int32_t tcps_ecn_conn_plnoce;
+ u_int32_t tcps_ecn_conn_pl_ce;
+ u_int32_t tcps_ecn_conn_nopl_ce;
+ u_int32_t tcps_ecn_fallback_synloss;
+ u_int32_t tcps_ecn_fallback_reorder;
+ u_int32_t tcps_ecn_fallback_ce;
/* TFO-related statistics */
- u_int32_t tcps_tfo_syn_data_rcv;
- u_int32_t tcps_tfo_cookie_req_rcv;
- u_int32_t tcps_tfo_cookie_sent;
- u_int32_t tcps_tfo_cookie_invalid;
- u_int32_t tcps_tfo_cookie_req;
- u_int32_t tcps_tfo_cookie_rcv;
- u_int32_t tcps_tfo_syn_data_sent;
- u_int32_t tcps_tfo_syn_data_acked;
- u_int32_t tcps_tfo_syn_loss;
- u_int32_t tcps_tfo_blackhole;
+ u_int32_t tcps_tfo_syn_data_rcv;
+ u_int32_t tcps_tfo_cookie_req_rcv;
+ u_int32_t tcps_tfo_cookie_sent;
+ u_int32_t tcps_tfo_cookie_invalid;
+ u_int32_t tcps_tfo_cookie_req;
+ u_int32_t tcps_tfo_cookie_rcv;
+ u_int32_t tcps_tfo_syn_data_sent;
+ u_int32_t tcps_tfo_syn_data_acked;
+ u_int32_t tcps_tfo_syn_loss;
+ u_int32_t tcps_tfo_blackhole;
+ u_int32_t tcps_tfo_cookie_wrong;
+ u_int32_t tcps_tfo_no_cookie_rcv;
+ u_int32_t tcps_tfo_heuristics_disable;
+ u_int32_t tcps_tfo_sndblackhole;
+
+ /* MPTCP-related statistics */
+ u_int32_t tcps_mptcp_handover_attempt;
+ u_int32_t tcps_mptcp_interactive_attempt;
+ u_int32_t tcps_mptcp_aggregate_attempt;
+ u_int32_t tcps_mptcp_fp_handover_attempt;
+ u_int32_t tcps_mptcp_fp_interactive_attempt;
+ u_int32_t tcps_mptcp_fp_aggregate_attempt;
+ u_int32_t tcps_mptcp_heuristic_fallback;
+ u_int32_t tcps_mptcp_fp_heuristic_fallback;
+ u_int32_t tcps_mptcp_handover_success_wifi;
+ u_int32_t tcps_mptcp_handover_success_cell;
+ u_int32_t tcps_mptcp_interactive_success;
+ u_int32_t tcps_mptcp_aggregate_success;
+ u_int32_t tcps_mptcp_fp_handover_success_wifi;
+ u_int32_t tcps_mptcp_fp_handover_success_cell;
+ u_int32_t tcps_mptcp_fp_interactive_success;
+ u_int32_t tcps_mptcp_fp_aggregate_success;
+ u_int32_t tcps_mptcp_handover_cell_from_wifi;
+ u_int32_t tcps_mptcp_handover_wifi_from_cell;
+ u_int32_t tcps_mptcp_interactive_cell_from_wifi;
+ u_int64_t tcps_mptcp_handover_cell_bytes;
+ u_int64_t tcps_mptcp_interactive_cell_bytes;
+ u_int64_t tcps_mptcp_aggregate_cell_bytes;
+ u_int64_t tcps_mptcp_handover_all_bytes;
+ u_int64_t tcps_mptcp_interactive_all_bytes;
+ u_int64_t tcps_mptcp_aggregate_all_bytes;
+ u_int32_t tcps_mptcp_back_to_wifi;
+ u_int32_t tcps_mptcp_wifi_proxy;
+ u_int32_t tcps_mptcp_cell_proxy;
+ u_int32_t tcps_mptcp_triggered_cell;
};
static void add_to_time_wait_locked(struct tcpcb *tp, uint32_t delay);
static boolean_t tcp_garbage_collect(struct inpcb *, int);
+#define TIMERENTRY_TO_TP(te) ((struct tcpcb *)((uintptr_t)te - offsetof(struct tcpcb, tentry.le.le_next)))
+
+#define VERIFY_NEXT_LINK(elm, field) do { \
+ if (LIST_NEXT((elm),field) != NULL && \
+ LIST_NEXT((elm),field)->field.le_prev != \
+ &((elm)->field.le_next)) \
+ panic("Bad link elm %p next->prev != elm", (elm)); \
+} while(0)
+
+#define VERIFY_PREV_LINK(elm, field) do { \
+ if (*(elm)->field.le_prev != (elm)) \
+ panic("Bad link elm %p prev->next != elm", (elm)); \
+} while(0)
+
+#define TCP_SET_TIMER_MODE(mode, i) do { \
+ if (IS_TIMER_HZ_10MS(i)) \
+ (mode) |= TCP_TIMERLIST_10MS_MODE; \
+ else if (IS_TIMER_HZ_100MS(i)) \
+ (mode) |= TCP_TIMERLIST_100MS_MODE; \
+ else \
+ (mode) |= TCP_TIMERLIST_500MS_MODE; \
+} while(0)
+
+#if (DEVELOPMENT || DEBUG)
+SYSCTL_UINT(_net_inet_tcp, OID_AUTO, mss_rec_medium,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_mss_rec_medium, 0,
+ "Medium MSS based on recommendation in link status report");
+SYSCTL_UINT(_net_inet_tcp, OID_AUTO, mss_rec_low,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_mss_rec_low, 0,
+ "Low MSS based on recommendation in link status report");
+
+static int32_t tcp_change_mss_recommended = 0;
+static int
+sysctl_change_mss_recommended SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+ int i, err = 0, changed = 0;
+ struct ifnet *ifp;
+ struct if_link_status ifsr;
+ struct if_cellular_status_v1 *new_cell_sr;
+ err = sysctl_io_number(req, tcp_change_mss_recommended,
+ sizeof(int32_t), &i, &changed);
+ if (changed) {
+ ifnet_head_lock_shared();
+ TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
+ if (IFNET_IS_CELLULAR(ifp)) {
+ bzero(&ifsr, sizeof(ifsr));
+ new_cell_sr = &ifsr.ifsr_u.ifsr_cell.if_cell_u.if_status_v1;
+ ifsr.ifsr_version = IF_CELLULAR_STATUS_REPORT_CURRENT_VERSION;
+ ifsr.ifsr_len = sizeof(*new_cell_sr);
+
+ /* Set MSS recommended */
+ new_cell_sr->valid_bitmask |= IF_CELL_UL_MSS_RECOMMENDED_VALID;
+ new_cell_sr->mss_recommended = i;
+ err = ifnet_link_status_report(ifp, new_cell_sr, sizeof(new_cell_sr));
+ if (err == 0) {
+ tcp_change_mss_recommended = i;
+ } else {
+ break;
+ }
+ }
+ }
+ ifnet_head_done();
+ }
+ return err;
+}
+
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, change_mss_recommended,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_change_mss_recommended,
+ 0, sysctl_change_mss_recommended, "IU", "Change MSS recommended");
+
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, report_stats_interval,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_report_stats_interval, 0,
+ "Report stats interval");
+#endif /* (DEVELOPMENT || DEBUG) */
+
+/*
+ * Macro to compare two timers. If there is a reset of the sign bit,
+ * it is safe to assume that the timer has wrapped around. By doing
+ * signed comparision, we take care of wrap around such that the value
+ * with the sign bit reset is actually ahead of the other.
+ */
+inline int32_t
+timer_diff(uint32_t t1, uint32_t toff1, uint32_t t2, uint32_t toff2)
+{
+ return (int32_t)((t1 + toff1) - (t2 + toff2));
+};
+
/*
* Add to tcp timewait list, delay is given in milliseconds.
*/
uint32_t timer;
/* pcb list should be locked when we get here */
- lck_rw_assert(pcbinfo->ipi_lock, LCK_RW_ASSERT_EXCLUSIVE);
+ LCK_RW_ASSERT(pcbinfo->ipi_lock, LCK_RW_ASSERT_EXCLUSIVE);
/* We may get here multiple times, so check */
if (!(inp->inp_flags2 & INP2_TIMEWAIT)) {
pcbinfo->ipi_twcount++;
inp->inp_flags2 |= INP2_TIMEWAIT;
-
+
/* Remove from global inp list */
LIST_REMOVE(inp, inp_list);
} else {
/* Compute the time at which this socket can be closed */
timer = tcp_now + delay;
-
+
/* We will use the TCPT_2MSL timer for tracking this delay */
- if (TIMER_IS_ON_LIST(tp))
+ if (TIMER_IS_ON_LIST(tp)) {
tcp_remove_timer(tp);
+ }
tp->t_timer[TCPT_2MSL] = timer;
TAILQ_INSERT_TAIL(&tcp_tw_tailq, tp, t_twentry);
add_to_time_wait(struct tcpcb *tp, uint32_t delay)
{
struct inpcbinfo *pcbinfo = &tcbinfo;
- if (tp->t_inpcb->inp_socket->so_options & SO_NOWAKEFROMSLEEP)
+ if (tp->t_inpcb->inp_socket->so_options & SO_NOWAKEFROMSLEEP) {
socket_post_kev_msg_closed(tp->t_inpcb->inp_socket);
+ }
/* 19182803: Notify nstat that connection is closing before waiting. */
nstat_pcb_detach(tp->t_inpcb);
if (!lck_rw_try_lock_exclusive(pcbinfo->ipi_lock)) {
- tcp_unlock(tp->t_inpcb->inp_socket, 0, 0);
+ socket_unlock(tp->t_inpcb->inp_socket, 0);
lck_rw_lock_exclusive(pcbinfo->ipi_lock);
- tcp_lock(tp->t_inpcb->inp_socket, 0, 0);
+ socket_lock(tp->t_inpcb->inp_socket, 0);
}
add_to_time_wait_locked(tp, delay);
lck_rw_done(pcbinfo->ipi_lock);
tcp_remove_from_time_wait(struct inpcb *inp)
{
struct tcpcb *tp = intotcpcb(inp);
- if (inp->inp_flags2 & INP2_TIMEWAIT)
+ if (inp->inp_flags2 & INP2_TIMEWAIT) {
TAILQ_REMOVE(&tcp_tw_tailq, tp, t_twentry);
+ }
}
static boolean_t
tcp_garbage_collect(struct inpcb *inp, int istimewait)
{
boolean_t active = FALSE;
- struct socket *so;
+ struct socket *so, *mp_so = NULL;
struct tcpcb *tp;
so = inp->inp_socket;
tp = intotcpcb(inp);
+ if (so->so_flags & SOF_MP_SUBFLOW) {
+ mp_so = mptetoso(tptomptp(tp)->mpt_mpte);
+ if (!socket_try_lock(mp_so)) {
+ mp_so = NULL;
+ active = TRUE;
+ goto out;
+ }
+ mp_so->so_usecount++;
+ }
+
/*
* Skip if still in use or busy; it would have been more efficient
* if we were to test so_usecount against 0, but this isn't possible
* overflow sockets that are eligible for garbage collection have
* their usecounts set to 1.
*/
- if (!lck_mtx_try_lock_spin(&inp->inpcb_mtx))
- return (TRUE);
+ if (!lck_mtx_try_lock_spin(&inp->inpcb_mtx)) {
+ active = TRUE;
+ goto out;
+ }
/* Check again under the lock */
if (so->so_usecount > 1) {
- if (inp->inp_wantcnt == WNT_STOPUSING)
+ if (inp->inp_wantcnt == WNT_STOPUSING) {
active = TRUE;
+ }
lck_mtx_unlock(&inp->inpcb_mtx);
- return (active);
+ goto out;
}
- if (istimewait &&
- TSTMP_GEQ(tcp_now, tp->t_timer[TCPT_2MSL]) &&
- tp->t_state != TCPS_CLOSED) {
+ if (istimewait && TSTMP_GEQ(tcp_now, tp->t_timer[TCPT_2MSL]) &&
+ tp->t_state != TCPS_CLOSED) {
/* Become a regular mutex */
lck_mtx_convert_spin(&inp->inpcb_mtx);
tcp_close(tp);
((istimewait && (so->so_flags & SOF_OVERFLOW)) ||
((tp != NULL) && (tp->t_state == TCPS_CLOSED) &&
(so->so_head != NULL) &&
- ((so->so_state & (SS_INCOMP|SS_CANTSENDMORE|SS_CANTRCVMORE)) ==
- (SS_INCOMP|SS_CANTSENDMORE|SS_CANTRCVMORE))))) {
-
+ ((so->so_state & (SS_INCOMP | SS_CANTSENDMORE | SS_CANTRCVMORE)) ==
+ (SS_INCOMP | SS_CANTSENDMORE | SS_CANTRCVMORE))))) {
if (inp->inp_state != INPCB_STATE_DEAD) {
/* Become a regular mutex */
lck_mtx_convert_spin(&inp->inpcb_mtx);
#if INET6
- if (SOCK_CHECK_DOM(so, PF_INET6))
+ if (SOCK_CHECK_DOM(so, PF_INET6)) {
in6_pcbdetach(inp);
- else
+ } else
#endif /* INET6 */
- in_pcbdetach(inp);
+ in_pcbdetach(inp);
}
+ VERIFY(so->so_usecount > 0);
so->so_usecount--;
- if (inp->inp_wantcnt == WNT_STOPUSING)
+ if (inp->inp_wantcnt == WNT_STOPUSING) {
active = TRUE;
+ }
lck_mtx_unlock(&inp->inpcb_mtx);
- return (active);
+ goto out;
} else if (inp->inp_wantcnt != WNT_STOPUSING) {
lck_mtx_unlock(&inp->inpcb_mtx);
- return (FALSE);
+ active = FALSE;
+ goto out;
}
/*
- * We get here because the PCB is no longer searchable
- * (WNT_STOPUSING); detach (if needed) and dispose if it is dead
- * (usecount is 0). This covers all cases, including overflow
- * sockets and those that are considered as "embryonic",
- * i.e. created by sonewconn() in TCP input path, and have
+ * We get here because the PCB is no longer searchable
+ * (WNT_STOPUSING); detach (if needed) and dispose if it is dead
+ * (usecount is 0). This covers all cases, including overflow
+ * sockets and those that are considered as "embryonic",
+ * i.e. created by sonewconn() in TCP input path, and have
* not yet been committed. For the former, we reduce the usecount
- * to 0 as done by the code above. For the latter, the usecount
+ * to 0 as done by the code above. For the latter, the usecount
* would have reduced to 0 as part calling soabort() when the
* socket is dropped at the end of tcp_input().
*/
if (so->so_usecount == 0) {
DTRACE_TCP4(state__change, void, NULL, struct inpcb *, inp,
- struct tcpcb *, tp, int32_t, TCPS_CLOSED);
+ struct tcpcb *, tp, int32_t, TCPS_CLOSED);
/* Become a regular mutex */
lck_mtx_convert_spin(&inp->inpcb_mtx);
/*
- * If this tp still happens to be on the timer list,
+ * If this tp still happens to be on the timer list,
* take it out
*/
if (TIMER_IS_ON_LIST(tp)) {
if (inp->inp_state != INPCB_STATE_DEAD) {
#if INET6
- if (SOCK_CHECK_DOM(so, PF_INET6))
+ if (SOCK_CHECK_DOM(so, PF_INET6)) {
in6_pcbdetach(inp);
- else
+ } else
#endif /* INET6 */
- in_pcbdetach(inp);
+ in_pcbdetach(inp);
}
+
+ if (mp_so) {
+ mptcp_subflow_del(tptomptp(tp)->mpt_mpte, tp->t_mpsub);
+
+ /* so is now unlinked from mp_so - let's drop the lock */
+ socket_unlock(mp_so, 1);
+ mp_so = NULL;
+ }
+
in_pcbdispose(inp);
- return (FALSE);
+ active = FALSE;
+ goto out;
}
lck_mtx_unlock(&inp->inpcb_mtx);
- return (TRUE);
+ active = TRUE;
+
+out:
+ if (mp_so) {
+ socket_unlock(mp_so, 1);
+ }
+
+ return active;
}
/*
tcp_gc_done = TRUE;
LIST_FOREACH_SAFE(inp, &tcb, inp_list, nxt) {
- if (tcp_garbage_collect(inp, 0))
+ if (tcp_garbage_collect(inp, 0)) {
atomic_add_32(&ipi->ipi_gc_req.intimer_fast, 1);
+ }
}
/* Now cleanup the time wait ones */
TAILQ_FOREACH_SAFE(tw_tp, &tcp_tw_tailq, t_twentry, tw_ntp) {
/*
- * We check the timestamp here without holding the
+ * We check the timestamp here without holding the
* socket lock for better performance. If there are
* any pcbs in time-wait, the timer will get rescheduled.
* Hence some error in this check can be tolerated.
*
* Sometimes a socket on time-wait queue can be closed if
* 2MSL timer expired but the application still has a
- * usecount on it.
+ * usecount on it.
*/
- if (tw_tp->t_state == TCPS_CLOSED ||
+ if (tw_tp->t_state == TCPS_CLOSED ||
TSTMP_GEQ(tcp_now, tw_tp->t_timer[TCPT_2MSL])) {
- if (tcp_garbage_collect(tw_tp->t_inpcb, 1))
+ if (tcp_garbage_collect(tw_tp->t_inpcb, 1)) {
atomic_add_32(&ipi->ipi_gc_req.intimer_lazy, 1);
+ }
}
}
lck_rw_done(ipi->ipi_lock);
/* Clean up the socache while we are here */
- if (so_cache_timer())
+ if (so_cache_timer()) {
atomic_add_32(&ipi->ipi_gc_req.intimer_lazy, 1);
+ }
KERNEL_DEBUG(DBG_FNC_TCP_SLOW | DBG_FUNC_END, tws_checked,
cur_tw_slot, 0, 0, 0);
* Cancel all timers for TCP tp.
*/
void
-tcp_canceltimers(tp)
- struct tcpcb *tp;
+tcp_canceltimers(struct tcpcb *tp)
{
- register int i;
+ int i;
tcp_remove_timer(tp);
- for (i = 0; i < TCPT_NTIMERS; i++)
+ for (i = 0; i < TCPT_NTIMERS; i++) {
tp->t_timer[i] = 0;
+ }
tp->tentry.timer_start = tcp_now;
tp->tentry.index = TCPT_NONE;
}
-int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
- { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
+int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
+{ 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
-int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
- { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
+int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
+{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
-static int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
+static int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
-void tcp_rexmt_save_state(struct tcpcb *tp)
+void
+tcp_rexmt_save_state(struct tcpcb *tp)
{
u_int32_t fsize;
if (TSTMP_SUPPORTED(tp)) {
/*
- * Since timestamps are supported on the connection,
+ * Since timestamps are supported on the connection,
* we can do recovery as described in rfc 4015.
*/
fsize = tp->snd_max - tp->snd_una;
* Timestamp option is not supported on this connection.
* Record ssthresh and cwnd so they can
* be recovered if this turns out to be a "bad" retransmit.
- * A retransmit is considered "bad" if an ACK for this
+ * A retransmit is considered "bad" if an ACK for this
* segment is received within RTT/2 interval; the assumption
- * here is that the ACK was already in flight. See
+ * here is that the ACK was already in flight. See
* "On Estimating End-to-End Network Path Properties" by
* Allman and Paxson for more details.
*/
tp->snd_cwnd_prev = tp->snd_cwnd;
tp->snd_ssthresh_prev = tp->snd_ssthresh;
tp->snd_recover_prev = tp->snd_recover;
- if (IN_FASTRECOVERY(tp))
+ if (IN_FASTRECOVERY(tp)) {
tp->t_flags |= TF_WASFRECOVERY;
- else
+ } else {
tp->t_flags &= ~TF_WASFRECOVERY;
+ }
}
tp->t_srtt_prev = (tp->t_srtt >> TCP_RTT_SHIFT) + 2;
tp->t_rttvar_prev = (tp->t_rttvar >> TCP_RTTVAR_SHIFT);
* Revert to the older segment size if there is an indication that PMTU
* blackhole detection was not needed.
*/
-void tcp_pmtud_revert_segment_size(struct tcpcb *tp)
+void
+tcp_pmtud_revert_segment_size(struct tcpcb *tp)
{
int32_t optlen;
VERIFY(tp->t_pmtud_saved_maxopd > 0);
- tp->t_flags |= TF_PMTUD;
- tp->t_flags &= ~TF_BLACKHOLE;
+ tp->t_flags |= TF_PMTUD;
+ tp->t_flags &= ~TF_BLACKHOLE;
optlen = tp->t_maxopd - tp->t_maxseg;
tp->t_maxopd = tp->t_pmtud_saved_maxopd;
tp->t_maxseg = tp->t_maxopd - optlen;
+
/*
- * Reset the slow-start flight size as it
+ * Reset the slow-start flight size as it
* may depend on the new MSS
*/
- if (CC_ALGO(tp)->cwnd_init != NULL)
+ if (CC_ALGO(tp)->cwnd_init != NULL) {
CC_ALGO(tp)->cwnd_init(tp);
+ }
tp->t_pmtud_start_ts = 0;
tcpstat.tcps_pmtudbh_reverted++;
+
+ /* change MSS according to recommendation, if there was one */
+ tcp_update_mss_locked(tp->t_inpcb->inp_socket, NULL);
}
/*
* TCP timer processing.
*/
struct tcpcb *
-tcp_timers(tp, timer)
- register struct tcpcb *tp;
- int timer;
+tcp_timers(struct tcpcb *tp, int timer)
{
int32_t rexmt, optlen = 0, idle_time = 0;
struct socket *so;
idle_time = tcp_now - tp->t_rcvtime;
switch (timer) {
-
/*
* 2 MSL timeout in shutdown went off. If we're closed but
* still waiting for peer to close and connection has been idle
if (tp->t_state != TCPS_TIME_WAIT &&
tp->t_state != TCPS_FIN_WAIT_2 &&
((idle_time > 0) && (idle_time < TCP_CONN_MAXIDLE(tp)))) {
- tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
- (u_int32_t)TCP_CONN_KEEPINTVL(tp));
+ tp->t_timer[TCPT_2MSL] = OFFSET_FROM_START(tp,
+ (u_int32_t)TCP_CONN_KEEPINTVL(tp));
} else {
tp = tcp_close(tp);
- return(tp);
+ return tp;
}
break;
* to a longer retransmit interval and retransmit one segment.
*/
case TCPT_REXMT:
- accsleep_ms = mach_absolutetime_asleep / 1000000UL;
- if (accsleep_ms > tp->t_accsleep_ms)
+ absolutetime_to_nanoseconds(mach_absolutetime_asleep,
+ &accsleep_ms);
+ accsleep_ms = accsleep_ms / 1000000UL;
+ if (accsleep_ms > tp->t_accsleep_ms) {
last_sleep_ms = accsleep_ms - tp->t_accsleep_ms;
+ }
/*
* Drop a connection in the retransmit timer
* 1. If we have retransmitted more than TCP_MAXRXTSHIFT
((tp->t_flagsext & TF_RXTFINDROP) != 0 &&
(tp->t_flags & TF_SENTFIN) != 0 && tp->t_rxtshift >= 4) ||
(tp->t_rxtshift > 4 && last_sleep_ms >= TCP_SLEEP_TOO_LONG)) {
+ if (tp->t_state == TCPS_ESTABLISHED &&
+ tp->t_rxt_minimum_timeout > 0) {
+ /*
+ * Avoid dropping a connection if minimum
+ * timeout is set and that time did not
+ * pass. We will retry sending
+ * retransmissions at the maximum interval
+ */
+ if (TSTMP_LT(tcp_now, (tp->t_rxtstart +
+ tp->t_rxt_minimum_timeout))) {
+ tp->t_rxtshift = TCP_MAXRXTSHIFT - 1;
+ goto retransmit_packet;
+ }
+ }
if ((tp->t_flagsext & TF_RXTFINDROP) != 0) {
tcpstat.tcps_rxtfindrop++;
} else if (last_sleep_ms >= TCP_SLEEP_TOO_LONG) {
} else {
tcpstat.tcps_timeoutdrop++;
}
+ if (tp->t_rxtshift >= TCP_MAXRXTSHIFT) {
+ if (TCP_ECN_ENABLED(tp)) {
+ INP_INC_IFNET_STAT(tp->t_inpcb,
+ ecn_on.rxmit_drop);
+ } else {
+ INP_INC_IFNET_STAT(tp->t_inpcb,
+ ecn_off.rxmit_drop);
+ }
+ }
tp->t_rxtshift = TCP_MAXRXTSHIFT;
- postevent(so, 0, EV_TIMEOUT);
- soevent(so,
- (SO_FILT_HINT_LOCKED|SO_FILT_HINT_TIMEOUT));
+ postevent(so, 0, EV_TIMEOUT);
+ soevent(so,
+ (SO_FILT_HINT_LOCKED | SO_FILT_HINT_TIMEOUT));
+
+ if (TCP_ECN_ENABLED(tp) &&
+ tp->t_state == TCPS_ESTABLISHED) {
+ tcp_heuristic_ecn_droprxmt(tp);
+ }
+
tp = tcp_drop(tp, tp->t_softerror ?
tp->t_softerror : ETIMEDOUT);
break;
}
-
+retransmit_packet:
tcpstat.tcps_rexmttimeo++;
tp->t_accsleep_ms = accsleep_ms;
- if (tp->t_rxtshift == 1 &&
- tp->t_state == TCPS_ESTABLISHED) {
+ if (tp->t_rxtshift == 1 &&
+ tp->t_state == TCPS_ESTABLISHED) {
/* Set the time at which retransmission started. */
tp->t_rxtstart = tcp_now;
- /*
+ /*
* if this is the first retransmit timeout, save
* the state so that we can recover if the timeout
* is spurious.
- */
+ */
tcp_rexmt_save_state(tp);
}
#if MPTCP
(tp->t_state == TCPS_ESTABLISHED) &&
(tp->t_mpflags & TMPF_MPTCP_TRUE)) {
mptcp_act_on_txfail(so);
+ }
+ if (so->so_flags & SOF_MP_SUBFLOW) {
+ struct mptses *mpte = tptomptp(tp)->mpt_mpte;
+
+ mptcp_check_subflows_and_add(mpte);
}
#endif /* MPTCP */
if (tp->t_adaptive_wtimo > 0 &&
- tp->t_rxtshift > tp->t_adaptive_wtimo &&
- TCPS_HAVEESTABLISHED(tp->t_state)) {
+ tp->t_rxtshift > tp->t_adaptive_wtimo &&
+ TCPS_HAVEESTABLISHED(tp->t_state)) {
/* Send an event to the application */
soevent(so,
- (SO_FILT_HINT_LOCKED|
- SO_FILT_HINT_ADAPTIVE_WTIMO));
+ (SO_FILT_HINT_LOCKED |
+ SO_FILT_HINT_ADAPTIVE_WTIMO));
}
/*
tp->t_flagsext &= ~(TF_DELAY_RECOVERY);
}
- if (tp->t_state == TCPS_SYN_RECEIVED)
+ if (tp->t_state == TCPS_SYN_RECEIVED) {
tcp_disable_tfo(tp);
+ }
- if ((tp->t_tfo_stats & TFO_S_SYN_DATA_SENT) &&
+ if (!(tp->t_tfo_flags & TFO_F_HEURISTIC_DONE) &&
+ (tp->t_tfo_stats & TFO_S_SYN_DATA_SENT) &&
!(tp->t_tfo_flags & TFO_F_NO_SNDPROBING) &&
((tp->t_state != TCPS_SYN_SENT && tp->t_rxtshift > 1) ||
- tp->t_rxtshift > 2)) {
+ tp->t_rxtshift > 4)) {
/*
* For regular retransmissions, a first one is being
* done for tail-loss probe.
so->so_error = ENODATA;
sorwakeup(so);
sowwakeup(so);
+
+ tp->t_tfo_stats |= TFO_S_SEND_BLACKHOLE;
+ tcpstat.tcps_tfo_sndblackhole++;
+ }
+
+ if (!(tp->t_tfo_flags & TFO_F_HEURISTIC_DONE) &&
+ (tp->t_tfo_stats & TFO_S_SYN_DATA_ACKED) &&
+ tp->t_rxtshift > 3) {
+ if (TSTMP_GT(tp->t_sndtime - 10 * TCP_RETRANSHZ, tp->t_rcvtime)) {
+ tcp_heuristic_tfo_middlebox(tp);
+
+ so->so_error = ENODATA;
+ sorwakeup(so);
+ sowwakeup(so);
+ }
}
if (tp->t_state == TCPS_SYN_SENT) {
tp->t_stat.synrxtshift = tp->t_rxtshift;
/* When retransmitting, disable TFO */
- if (tfo_enabled(tp)) {
+ if (tfo_enabled(tp) &&
+ (!(so->so_flags1 & SOF1_DATA_AUTHENTICATED) ||
+ (tp->t_flagsext & TF_FASTOPEN_HEUR))) {
tp->t_flagsext &= ~TF_FASTOPEN;
tp->t_tfo_flags |= TFO_F_SYN_LOSS;
-
- tp->t_tfo_stats |= TFO_S_SYN_LOSS;
- tcpstat.tcps_tfo_syn_loss++;
}
} else {
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
}
- TCPT_RANGESET(tp->t_rxtcur, rexmt,
- tp->t_rttmin, TCPTV_REXMTMAX,
- TCP_ADD_REXMTSLOP(tp));
+ TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX,
+ TCP_ADD_REXMTSLOP(tp));
tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
- if (INP_WAIT_FOR_IF_FEEDBACK(tp->t_inpcb))
+ if (INP_WAIT_FOR_IF_FEEDBACK(tp->t_inpcb)) {
goto fc_output;
+ }
tcp_free_sackholes(tp);
/*
* Check for potential Path MTU Discovery Black Hole
*/
if (tcp_pmtud_black_hole_detect &&
- !(tp->t_flagsext & TF_NOBLACKHOLE_DETECTION) &&
- (tp->t_state == TCPS_ESTABLISHED)) {
+ !(tp->t_flagsext & TF_NOBLACKHOLE_DETECTION) &&
+ (tp->t_state == TCPS_ESTABLISHED)) {
if ((tp->t_flags & TF_PMTUD) &&
((tp->t_flags & TF_MAXSEGSNT)
|| tp->t_pmtud_lastseg_size > tcp_pmtud_black_hole_mss) &&
tp->t_rxtshift == 2) {
- /*
+ /*
* Enter Path MTU Black-hole Detection mechanism:
* - Disable Path MTU Discovery (IP "DF" bit).
* - Reduce MTU to lower value than what we
/* Keep track of previous MSS */
tp->t_pmtud_saved_maxopd = tp->t_maxopd;
tp->t_pmtud_start_ts = tcp_now;
- if (tp->t_pmtud_start_ts == 0)
+ if (tp->t_pmtud_start_ts == 0) {
tp->t_pmtud_start_ts++;
+ }
/* Reduce the MSS to intermediary value */
if (tp->t_maxopd > tcp_pmtud_black_hole_mss) {
tp->t_maxopd = tcp_pmtud_black_hole_mss;
} else {
- tp->t_maxopd = /* use the default MSS */
+ tp->t_maxopd = /* use the default MSS */
#if INET6
- isipv6 ? tcp_v6mssdflt :
+ isipv6 ? tcp_v6mssdflt :
#endif /* INET6 */
- tcp_mssdflt;
+ tcp_mssdflt;
}
tp->t_maxseg = tp->t_maxopd - optlen;
/*
- * Reset the slow-start flight size
+ * Reset the slow-start flight size
* as it may depend on the new MSS
- */
- if (CC_ALGO(tp)->cwnd_init != NULL)
+ */
+ if (CC_ALGO(tp)->cwnd_init != NULL) {
CC_ALGO(tp)->cwnd_init(tp);
+ }
+ tp->snd_cwnd = tp->t_maxseg;
}
/*
* If further retransmissions are still
* MSS and blackhole detection flags.
*/
else {
-
if ((tp->t_flags & TF_BLACKHOLE) &&
(tp->t_rxtshift > 4)) {
tcp_pmtud_revert_segment_size(tp);
+ tp->snd_cwnd = tp->t_maxseg;
}
}
}
* Do this only on non-local connections.
*/
if (tp->t_state == TCPS_SYN_SENT &&
- tp->t_rxtshift == tcp_broken_peer_syn_rxmit_thres)
- tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_REQ_CC);
+ tp->t_rxtshift == tcp_broken_peer_syn_rxmit_thres) {
+ tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_REQ_CC);
+ }
/*
* If losing, let the lower level know and try for
*/
if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
#if INET6
- if (isipv6)
+ if (isipv6) {
in6_losing(tp->t_inpcb);
- else
+ } else
#endif /* INET6 */
in_losing(tp->t_inpcb);
tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
/* If timing a segment in this window, stop the timer */
tp->t_rtttime = 0;
- if (!IN_FASTRECOVERY(tp) && tp->t_rxtshift == 1)
+ if (!IN_FASTRECOVERY(tp) && tp->t_rxtshift == 1) {
tcpstat.tcps_tailloss_rto++;
+ }
/*
* been retransmitted by way of the retransmission timer at
* least once, the value of ssthresh is held constant
*/
- if (tp->t_rxtshift == 1 &&
+ if (tp->t_rxtshift == 1 &&
CC_ALGO(tp)->after_timeout != NULL) {
CC_ALGO(tp)->after_timeout(tp);
/*
* right after Fast Retransmits and ECE
* notification receipts.
*/
- if (TCP_ECN_ENABLED(tp))
+ if (TCP_ECN_ENABLED(tp)) {
tp->ecn_flags |= TE_SENDCWR;
+ }
}
EXIT_FASTRECOVERY(tp);
* backoff, drop the connection if the idle time
* (no responses to probes) reaches the maximum
* backoff that we would use if retransmitting.
- *
- * Drop the connection if we reached the maximum allowed time for
- * Zero Window Probes without a non-zero update from the peer.
+ *
+ * Drop the connection if we reached the maximum allowed time for
+ * Zero Window Probes without a non-zero update from the peer.
* See rdar://5805356
*/
if ((tp->t_rxtshift == TCP_MAXRXTSHIFT &&
(idle_time >= tcp_maxpersistidle ||
- idle_time >= TCP_REXMTVAL(tp) * tcp_totbackoff)) ||
- ((tp->t_persist_stop != 0) &&
- TSTMP_LEQ(tp->t_persist_stop, tcp_now))) {
+ idle_time >= TCP_REXMTVAL(tp) * tcp_totbackoff)) ||
+ ((tp->t_persist_stop != 0) &&
+ TSTMP_LEQ(tp->t_persist_stop, tcp_now))) {
tcpstat.tcps_persistdrop++;
postevent(so, 0, EV_TIMEOUT);
soevent(so,
- (SO_FILT_HINT_LOCKED|SO_FILT_HINT_TIMEOUT));
+ (SO_FILT_HINT_LOCKED | SO_FILT_HINT_TIMEOUT));
tp = tcp_drop(tp, ETIMEDOUT);
break;
}
* Regular TCP connections do not send keepalives after closing
* MPTCP must not also, after sending Data FINs.
*/
- struct mptcb *mp_tp = tp->t_mptcb;
+ struct mptcb *mp_tp = tptomptp(tp);
if ((tp->t_mpflags & TMPF_MPTCP_TRUE) &&
(tp->t_state > TCPS_ESTABLISHED)) {
goto dropit;
} else if (mp_tp != NULL) {
- if ((mptcp_ok_to_keepalive(mp_tp) == 0))
+ if ((mptcp_ok_to_keepalive(mp_tp) == 0)) {
goto dropit;
+ }
}
#endif /* MPTCP */
- if (tp->t_state < TCPS_ESTABLISHED)
+ if (tp->t_state < TCPS_ESTABLISHED) {
goto dropit;
+ }
if ((always_keepalive ||
(tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) ||
(tp->t_flagsext & TF_DETECT_READSTALL) ||
(tp->t_tfo_probe_state == TFO_PROBE_PROBING)) &&
(tp->t_state <= TCPS_CLOSING || tp->t_state == TCPS_FIN_WAIT_2)) {
- if (idle_time >= TCP_CONN_KEEPIDLE(tp) + TCP_CONN_MAXIDLE(tp))
+ if (idle_time >= TCP_CONN_KEEPIDLE(tp) + TCP_CONN_MAXIDLE(tp)) {
goto dropit;
+ }
/*
* Send a packet designed to force a response
* if the peer is up and reachable:
tra.nocell = INP_NO_CELLULAR(inp);
tra.noexpensive = INP_NO_EXPENSIVE(inp);
tra.awdl_unrestricted = INP_AWDL_UNRESTRICTED(inp);
- if (tp->t_inpcb->inp_flags & INP_BOUND_IF)
+ tra.intcoproc_allowed = INP_INTCOPROC_ALLOWED(inp);
+ if (tp->t_inpcb->inp_flags & INP_BOUND_IF) {
tra.ifscope = tp->t_inpcb->inp_boundifp->if_index;
- else
+ } else {
tra.ifscope = IFSCOPE_NONE;
+ }
tcp_respond(tp, t_template->tt_ipgen,
&t_template->tt_t, (struct mbuf *)NULL,
tp->rcv_nxt, tp->snd_una - 1, 0, &tra);
(void) m_free(dtom(t_template));
- if (tp->t_flagsext & TF_DETECT_READSTALL)
+ if (tp->t_flagsext & TF_DETECT_READSTALL) {
tp->t_rtimo_probes++;
+ }
}
tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(tp,
TCP_CONN_KEEPINTVL(tp));
if (tp->t_flagsext & TF_DETECT_READSTALL) {
struct ifnet *outifp = tp->t_inpcb->inp_last_outifp;
bool reenable_probe = false;
- /*
+ /*
* The keep alive packets sent to detect a read
- * stall did not get a response from the
+ * stall did not get a response from the
* peer. Generate more keep-alives to confirm this.
* If the number of probes sent reaches the limit,
* generate an event.
int ind = min(tp->t_rtimo_probes,
TCP_MAXRXTSHIFT);
tp->t_timer[TCPT_KEEP] = OFFSET_FROM_START(
- tp, tcp_backoff[ind] * TCP_REXMTVAL(tp));
+ tp, tcp_backoff[ind] * TCP_REXMTVAL(tp));
}
}
if (tp->t_tfo_probe_state == TFO_PROBE_PROBING) {
* backing off.
*/
tp->t_timer[TCPT_KEEP] = min(OFFSET_FROM_START(
- tp, tcp_backoff[ind] * TCP_REXMTVAL(tp)),
+ tp, tcp_backoff[ind] * TCP_REXMTVAL(tp)),
tp->t_timer[TCPT_KEEP]);
- } else if (tp->t_tfo_probe_state == TFO_PROBE_WAIT_DATA) {
+ } else if (!(tp->t_tfo_flags & TFO_F_HEURISTIC_DONE) &&
+ tp->t_tfo_probe_state == TFO_PROBE_WAIT_DATA) {
/* Still no data! Let's assume a TFO-error and err out... */
tcp_heuristic_tfo_middlebox(tp);
so->so_error = ENODATA;
sorwakeup(so);
+ tp->t_tfo_stats |= TFO_S_RECV_BLACKHOLE;
tcpstat.tcps_tfo_blackhole++;
}
break;
/*
* If delayed ack timer fired while stretching
* acks, count the number of times the streaming
- * detection was not correct. If this exceeds a
+ * detection was not correct. If this exceeds a
* threshold, disable strech ack on this
* connection
*
*/
if ((tp->t_flags & TF_STRETCHACK)) {
if (tp->t_unacksegs > 1 &&
- tp->t_unacksegs < maxseg_unacked)
+ tp->t_unacksegs < maxseg_unacked) {
tp->t_stretchack_delayed++;
+ }
if (tp->t_stretchack_delayed >
- TCP_STRETCHACK_DELAY_THRESHOLD) {
+ TCP_STRETCHACK_DELAY_THRESHOLD) {
tp->t_flagsext |= TF_DISABLE_STRETCHACK;
/*
* Note the time at which stretch
tp->rcv_nostrack_ts = tcp_now;
tcpstat.tcps_nostretchack++;
tp->t_stretchack_delayed = 0;
+ tp->rcv_nostrack_pkts = 0;
}
tcp_reset_stretch_ack(tp);
}
if (++tp->t_mprxtshift > TCP_MAXRXTSHIFT) {
tcpstat.tcps_timeoutdrop++;
postevent(so, 0, EV_TIMEOUT);
- soevent(so,
- (SO_FILT_HINT_LOCKED|
+ soevent(so,
+ (SO_FILT_HINT_LOCKED |
SO_FILT_HINT_TIMEOUT));
tp = tcp_drop(tp, tp->t_softerror ?
- tp->t_softerror : ETIMEDOUT);
+ tp->t_softerror : ETIMEDOUT);
break;
}
tcpstat.tcps_join_rxmts++;
+ tp->t_mpflags |= TMPF_SND_JACK;
tp->t_flags |= TF_ACKNOW;
/*
- * No backoff is implemented for simplicity for this
+ * No backoff is implemented for simplicity for this
* corner case.
*/
(void) tcp_output(tp);
* send a probe
*/
if (tp->t_state != TCPS_ESTABLISHED ||
- (tp->t_rxtshift > 0 && !(tp->t_flagsext & TF_PROBING))
- || tp->snd_max == tp->snd_una ||
- !SACK_ENABLED(tp) || !TAILQ_EMPTY(&tp->snd_holes) ||
- IN_FASTRECOVERY(tp))
+ (tp->t_rxtshift > 0 && !(tp->t_flagsext & TF_PROBING)) ||
+ tp->snd_max == tp->snd_una ||
+ !SACK_ENABLED(tp) ||
+ !TAILQ_EMPTY(&tp->snd_holes) ||
+ IN_FASTRECOVERY(tp)) {
break;
+ }
/*
* If there is no new data to send or if the
}
tcpstat.tcps_pto++;
- if (tp->t_flagsext & TF_PROBING)
+ if (tp->t_flagsext & TF_PROBING) {
tcpstat.tcps_probe_if++;
+ }
/* If timing a segment in this window, stop the timer */
tp->t_rtttime = 0;
tp->t_tlpstart = tcp_now;
tp->snd_cwnd += tp->t_maxseg;
- (void )tcp_output(tp);
+
+ /*
+ * When tail-loss-probe fires, we reset the RTO timer, because
+ * a probe just got sent, so we are good to push out the timer.
+ *
+ * Set to 0 to ensure that tcp_output() will reschedule it
+ */
+ tp->t_timer[TCPT_REXMT] = 0;
+
+ (void)tcp_output(tp);
tp->snd_cwnd -= tp->t_maxseg;
tp->t_tlphighrxt = tp->snd_nxt;
*/
if (IN_FASTRECOVERY(tp) ||
SEQ_GEQ(tp->snd_una, tp->snd_recover) ||
- tp->t_rxtshift > 0)
+ tp->t_rxtshift > 0) {
break;
+ }
VERIFY(SACK_ENABLED(tp));
tcp_rexmt_save_state(tp);
if (CC_ALGO(tp)->pre_fr != NULL) {
CC_ALGO(tp)->pre_fr(tp);
- if (TCP_ECN_ENABLED(tp))
+ if (TCP_ECN_ENABLED(tp)) {
tp->ecn_flags |= TE_SENDCWR;
+ }
}
ENTER_FASTRECOVERY(tp);
tp->t_timer[TCPT_REXMT] = 0;
tcpstat.tcps_sack_recovery_episode++;
+ tp->t_sack_recovery_episode++;
tp->sack_newdata = tp->snd_nxt;
tp->snd_cwnd = tp->t_maxseg;
tcp_ccdbg_trace(tp, NULL, TCP_CC_ENTER_FASTRECOVERY);
(void) tcp_output(tp);
break;
- dropit:
+dropit:
tcpstat.tcps_keepdrops++;
postevent(so, 0, EV_TIMEOUT);
soevent(so,
- (SO_FILT_HINT_LOCKED|SO_FILT_HINT_TIMEOUT));
+ (SO_FILT_HINT_LOCKED | SO_FILT_HINT_TIMEOUT));
tp = tcp_drop(tp, ETIMEDOUT);
break;
}
#if TCPDEBUG
- if (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
+ if (tp->t_inpcb->inp_socket->so_options & SO_DEBUG) {
tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
- PRU_SLOWTIMO);
+ PRU_SLOWTIMO);
+ }
#endif
- return (tp);
+ return tp;
}
/* Remove a timer entry from timer list */
{
struct tcptimerlist *listp = &tcp_timer_list;
- lck_mtx_assert(&tp->t_inpcb->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ socket_lock_assert_owned(tp->t_inpcb->inp_socket);
if (!(TIMER_IS_ON_LIST(tp))) {
return;
}
lck_mtx_lock(listp->mtx);
-
+
/* Check if pcb is on timer list again after acquiring the lock */
if (!(TIMER_IS_ON_LIST(tp))) {
lck_mtx_unlock(listp->mtx);
return;
}
-
- if (listp->next_te != NULL && listp->next_te == &tp->tentry)
+
+ if (listp->next_te != NULL && listp->next_te == &tp->tentry) {
listp->next_te = LIST_NEXT(&tp->tentry, le);
+ }
LIST_REMOVE(&tp->tentry, le);
tp->t_flags &= ~(TF_TIMER_ONLIST);
* in flux. In this case always acquire the lock and set the state
* correctly.
*/
- if (listp->running)
- return (TRUE);
+ if (listp->running) {
+ return TRUE;
+ }
- if (!listp->scheduled)
- return (TRUE);
+ if (!listp->scheduled) {
+ return TRUE;
+ }
diff = timer_diff(listp->runtime, 0, runtime, 0);
if (diff <= 0) {
/* The list is going to run before this timer */
- return (FALSE);
+ return FALSE;
} else {
if (mode & TCP_TIMERLIST_10MS_MODE) {
- if (diff <= TCP_TIMER_10MS_QUANTUM)
- return (FALSE);
+ if (diff <= TCP_TIMER_10MS_QUANTUM) {
+ return FALSE;
+ }
} else if (mode & TCP_TIMERLIST_100MS_MODE) {
- if (diff <= TCP_TIMER_100MS_QUANTUM)
- return (FALSE);
+ if (diff <= TCP_TIMER_100MS_QUANTUM) {
+ return FALSE;
+ }
} else {
- if (diff <= TCP_TIMER_500MS_QUANTUM)
- return (FALSE);
+ if (diff <= TCP_TIMER_500MS_QUANTUM) {
+ return FALSE;
+ }
}
}
- return (TRUE);
+ return TRUE;
}
void
-tcp_sched_timerlist(uint32_t offset)
+tcp_sched_timerlist(uint32_t offset)
{
uint64_t deadline = 0;
struct tcptimerlist *listp = &tcp_timer_list;
- lck_mtx_assert(listp->mtx, LCK_MTX_ASSERT_OWNED);
+ LCK_MTX_ASSERT(listp->mtx, LCK_MTX_ASSERT_OWNED);
offset = min(offset, TCP_TIMERLIST_MAX_OFFSET);
listp->runtime = tcp_now + offset;
+ listp->schedtime = tcp_now;
if (listp->runtime == 0) {
listp->runtime++;
offset++;
/*
* Function to run the timers for a connection.
*
- * Returns the offset of next timer to be run for this connection which
+ * Returns the offset of next timer to be run for this connection which
* can be used to reschedule the timerlist.
*
* te_mode is an out parameter that indicates the modes of active
*/
u_int32_t
tcp_run_conn_timer(struct tcpcb *tp, u_int16_t *te_mode,
- u_int16_t probe_if_index)
+ u_int16_t probe_if_index)
{
struct socket *so;
u_int16_t i = 0, index = TCPT_NONE, lo_index = TCPT_NONE;
bzero(needtorun, sizeof(needtorun));
*te_mode = 0;
- tcp_lock(tp->t_inpcb->inp_socket, 1, 0);
+ socket_lock(tp->t_inpcb->inp_socket, 1);
so = tp->t_inpcb->inp_socket;
- /* Release the want count on inp */
+ /* Release the want count on inp */
if (in_pcb_checkstate(tp->t_inpcb, WNT_RELEASE, 1)
- == WNT_STOPUSING) {
+ == WNT_STOPUSING) {
if (TIMER_IS_ON_LIST(tp)) {
tcp_remove_timer(tp);
}
- /* Looks like the TCP connection got closed while we
+ /* Looks like the TCP connection got closed while we
* were waiting for the lock.. Done
*/
goto done;
tp->t_flagsext |= TF_PROBING;
tcp_timers(tp, TCPT_PTO);
tp->t_timer[TCPT_PTO] = 0;
- tp->t_flagsext &= TF_PROBING;
+ tp->t_flagsext &= ~TF_PROBING;
}
/*
* with another thread that can cancel or reschedule the timer
* that is about to run. Check if we need to run anything.
*/
- if ((index = tp->tentry.index) == TCPT_NONE)
+ if ((index = tp->tentry.index) == TCPT_NONE) {
goto done;
-
+ }
+
timer_val = tp->t_timer[index];
diff = timer_diff(tp->tentry.runtime, 0, tcp_now, 0);
tp->t_timer[index] = 0;
if (timer_val > 0) {
tp = tcp_timers(tp, index);
- if (tp == NULL)
+ if (tp == NULL) {
goto done;
+ }
}
-
+
/*
* Check if there are any other timers that need to be run.
* While doing it, adjust the timer values wrt tcp_now.
for (i = 0; i < TCPT_NTIMERS; ++i) {
if (tp->t_timer[i] != 0) {
diff = timer_diff(tp->tentry.timer_start,
- tp->t_timer[i], tcp_now, 0);
+ tp->t_timer[i], tcp_now, 0);
if (diff <= 0) {
needtorun[i] = TRUE;
count++;
}
}
}
-
+
tp->tentry.timer_start = tcp_now;
tp->tentry.index = lo_index;
VERIFY(tp->tentry.index == TCPT_NONE || tp->tentry.mode > 0);
if (tp->tentry.index != TCPT_NONE) {
tp->tentry.runtime = tp->tentry.timer_start +
- tp->t_timer[tp->tentry.index];
- if (tp->tentry.runtime == 0)
+ tp->t_timer[tp->tentry.index];
+ if (tp->tentry.runtime == 0) {
tp->tentry.runtime++;
+ }
}
if (count > 0) {
offset = 0;
}
- tcp_unlock(so, 1, 0);
- return(offset);
+ socket_unlock(so, 1);
+ return offset;
}
void
-tcp_run_timerlist(void * arg1, void * arg2) {
+tcp_run_timerlist(void * arg1, void * arg2)
+{
#pragma unused(arg1, arg2)
struct tcptimerentry *te, *next_te;
struct tcptimerlist *listp = &tcp_timer_list;
struct tcpcb *tp;
uint32_t next_timer = 0; /* offset of the next timer on the list */
- u_int16_t te_mode = 0; /* modes of all active timers in a tcpcb */
+ u_int16_t te_mode = 0; /* modes of all active timers in a tcpcb */
u_int16_t list_mode = 0; /* cumulative of modes of all tcpcbs */
uint32_t active_count = 0;
lck_mtx_lock(listp->mtx);
+ int32_t drift = tcp_now - listp->runtime;
+ if (drift <= 1) {
+ tcpstat.tcps_timer_drift_le_1_ms++;
+ } else if (drift <= 10) {
+ tcpstat.tcps_timer_drift_le_10_ms++;
+ } else if (drift <= 20) {
+ tcpstat.tcps_timer_drift_le_20_ms++;
+ } else if (drift <= 50) {
+ tcpstat.tcps_timer_drift_le_50_ms++;
+ } else if (drift <= 100) {
+ tcpstat.tcps_timer_drift_le_100_ms++;
+ } else if (drift <= 200) {
+ tcpstat.tcps_timer_drift_le_200_ms++;
+ } else if (drift <= 500) {
+ tcpstat.tcps_timer_drift_le_500_ms++;
+ } else if (drift <= 1000) {
+ tcpstat.tcps_timer_drift_le_1000_ms++;
+ } else {
+ tcpstat.tcps_timer_drift_gt_1000_ms++;
+ }
+
listp->running = TRUE;
-
+
LIST_FOREACH_SAFE(te, &listp->lhead, le, next_te) {
uint32_t offset = 0;
uint32_t runtime = te->runtime;
* Some how this pcb went into dead state while
* on the timer list, just take it off the list.
* Since the timer list entry pointers are
- * protected by the timer list lock, we can
+ * protected by the timer list lock, we can
* do it here without the socket lock.
*/
if (TIMER_IS_ON_LIST(tp)) {
* release the lock, this pointer will be updated to the
* element after that.
*/
- listp->next_te = next_te;
+ listp->next_te = next_te;
VERIFY_NEXT_LINK(&tp->tentry, le);
VERIFY_PREV_LINK(&tp->tentry, le);
offset = tcp_run_conn_timer(tp, &te_mode,
listp->probe_if_index);
-
+
lck_mtx_lock(listp->mtx);
next_te = listp->next_te;
if (offset > 0 && te_mode != 0) {
list_mode |= te_mode;
- if (next_timer == 0 || offset < next_timer)
+ if (next_timer == 0 || offset < next_timer) {
next_timer = offset;
+ }
}
}
if (!LIST_EMPTY(&listp->lhead)) {
u_int16_t next_mode = 0;
if ((list_mode & TCP_TIMERLIST_10MS_MODE) ||
- (listp->pref_mode & TCP_TIMERLIST_10MS_MODE))
+ (listp->pref_mode & TCP_TIMERLIST_10MS_MODE)) {
next_mode = TCP_TIMERLIST_10MS_MODE;
- else if ((list_mode & TCP_TIMERLIST_100MS_MODE) ||
- (listp->pref_mode & TCP_TIMERLIST_100MS_MODE))
+ } else if ((list_mode & TCP_TIMERLIST_100MS_MODE) ||
+ (listp->pref_mode & TCP_TIMERLIST_100MS_MODE)) {
next_mode = TCP_TIMERLIST_100MS_MODE;
- else
+ } else {
next_mode = TCP_TIMERLIST_500MS_MODE;
+ }
if (next_mode != TCP_TIMERLIST_500MS_MODE) {
listp->idleruns = 0;
}
}
listp->mode = next_mode;
- if (listp->pref_offset != 0)
+ if (listp->pref_offset != 0) {
next_timer = min(listp->pref_offset, next_timer);
+ }
- if (listp->mode == TCP_TIMERLIST_500MS_MODE)
+ if (listp->mode == TCP_TIMERLIST_500MS_MODE) {
next_timer = max(next_timer,
- TCP_TIMER_500MS_QUANTUM);
+ TCP_TIMER_500MS_QUANTUM);
+ }
tcp_sched_timerlist(next_timer);
} else {
* Function to check if the timerlist needs to be rescheduled to run this
* connection's timers correctly.
*/
-void
-tcp_sched_timers(struct tcpcb *tp)
+void
+tcp_sched_timers(struct tcpcb *tp)
{
struct tcptimerentry *te = &tp->tentry;
u_int16_t index = te->index;
list_locked = TRUE;
}
- LIST_INSERT_HEAD(&listp->lhead, te, le);
- tp->t_flags |= TF_TIMER_ONLIST;
+ if (!TIMER_IS_ON_LIST(tp)) {
+ LIST_INSERT_HEAD(&listp->lhead, te, le);
+ tp->t_flags |= TF_TIMER_ONLIST;
- listp->entries++;
- if (listp->entries > listp->maxentries)
- listp->maxentries = listp->entries;
+ listp->entries++;
+ if (listp->entries > listp->maxentries) {
+ listp->maxentries = listp->entries;
+ }
- /* if the list is not scheduled, just schedule it */
- if (!listp->scheduled)
- goto schedule;
+ /* if the list is not scheduled, just schedule it */
+ if (!listp->scheduled) {
+ goto schedule;
+ }
+ }
}
-
/*
* Timer entry is currently on the list, check if the list needs
* to be rescheduled.
*/
if (need_to_resched_timerlist(te->runtime, mode)) {
tcp_resched_timerlist++;
-
+
if (!list_locked) {
lck_mtx_lock(listp->mtx);
list_locked = TRUE;
if (listp->running) {
listp->pref_mode |= mode;
if (listp->pref_offset == 0 ||
- offset < listp->pref_offset) {
+ offset < listp->pref_offset) {
listp->pref_offset = offset;
}
} else {
int32_t diff;
diff = timer_diff(listp->runtime, 0,
tcp_now, offset);
- if (diff <= 0)
+ if (diff <= 0) {
goto done;
- else
+ } else {
goto schedule;
+ }
} else {
goto schedule;
}
listp->idleruns = 0;
offset = min(offset, TCP_TIMER_10MS_QUANTUM);
} else if (mode & TCP_TIMERLIST_100MS_MODE) {
- if (listp->mode > TCP_TIMERLIST_100MS_MODE)
+ if (listp->mode > TCP_TIMERLIST_100MS_MODE) {
listp->mode = TCP_TIMERLIST_100MS_MODE;
+ }
listp->idleruns = 0;
offset = min(offset, TCP_TIMER_100MS_QUANTUM);
}
tcp_sched_timerlist(offset);
done:
- if (list_locked)
+ if (list_locked) {
lck_mtx_unlock(listp->mtx);
+ }
return;
}
-
+
static inline void
tcp_set_lotimer_index(struct tcpcb *tp)
{
VERIFY(tp->tentry.index == TCPT_NONE || tp->tentry.mode > 0);
if (tp->tentry.index != TCPT_NONE) {
- tp->tentry.runtime = tp->tentry.timer_start
+ tp->tentry.runtime = tp->tentry.timer_start
+ tp->t_timer[tp->tentry.index];
- if (tp->tentry.runtime == 0)
+ if (tp->tentry.runtime == 0) {
tp->tentry.runtime++;
+ }
}
}
void
tcp_check_timer_state(struct tcpcb *tp)
{
- lck_mtx_assert(&tp->t_inpcb->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+ socket_lock_assert_owned(tp->t_inpcb->inp_socket);
- if (tp->t_inpcb->inp_flags2 & INP2_TIMEWAIT)
+ if (tp->t_inpcb->inp_flags2 & INP2_TIMEWAIT) {
return;
+ }
tcp_set_lotimer_index(tp);
{
/* handle wrap around */
int32_t diff = (int32_t) (cur - *prev);
- if (diff > 0)
+ if (diff > 0) {
*dest = diff;
- else
+ } else {
*dest = 0;
+ }
+ *prev = cur;
+ return;
+}
+
+static inline void
+tcp_cumulative_stat64(u_int64_t cur, u_int64_t *prev, u_int64_t *dest)
+{
+ /* handle wrap around */
+ int64_t diff = (int64_t) (cur - *prev);
+ if (diff > 0) {
+ *dest = diff;
+ } else {
+ *dest = 0;
+ }
*prev = cur;
return;
}
struct sockaddr_in6 dst6;
struct rtentry *rt = NULL;
static struct tcp_last_report_stats prev;
- u_int64_t var, uptime;
+ u_int64_t var, uptime;
-#define stat data.u.tcp_stats
+#define stat data.u.tcp_stats
if (((uptime = net_uptime()) - tcp_last_report_time) <
- tcp_report_stats_interval)
+ tcp_report_stats_interval) {
return;
+ }
tcp_last_report_time = uptime;
/* ipv4 avg rtt */
lck_mtx_lock(rnh_lock);
rt = rt_lookup(TRUE, (struct sockaddr *)&dst, NULL,
- rt_tables[AF_INET], IFSCOPE_NONE);
+ rt_tables[AF_INET], IFSCOPE_NONE);
lck_mtx_unlock(rnh_lock);
if (rt != NULL) {
RT_LOCK(rt);
if (rt_primary_default(rt, rt_key(rt)) &&
- rt->rt_stats != NULL) {
+ rt->rt_stats != NULL) {
stat.ipv4_avgrtt = rt->rt_stats->nstat_avg_rtt;
}
RT_UNLOCK(rt);
dst6.sin6_family = AF_INET6;
lck_mtx_lock(rnh_lock);
- rt = rt_lookup(TRUE,(struct sockaddr *)&dst6, NULL,
- rt_tables[AF_INET6], IFSCOPE_NONE);
+ rt = rt_lookup(TRUE, (struct sockaddr *)&dst6, NULL,
+ rt_tables[AF_INET6], IFSCOPE_NONE);
lck_mtx_unlock(rnh_lock);
if (rt != NULL) {
RT_LOCK(rt);
if (rt_primary_default(rt, rt_key(rt)) &&
- rt->rt_stats != NULL) {
+ rt->rt_stats != NULL) {
stat.ipv6_avgrtt = rt->rt_stats->nstat_avg_rtt;
}
RT_UNLOCK(rt);
}
/* RTO after tail loss, shift by 10 for precision */
- if (tcpstat.tcps_sndrexmitpack > 0
+ if (tcpstat.tcps_sndrexmitpack > 0
&& tcpstat.tcps_tailloss_rto > 0) {
var = tcpstat.tcps_tailloss_rto << 10;
stat.send_tlrto_rate =
- (var * 100) / tcpstat.tcps_sndrexmitpack;
+ (var * 100) / tcpstat.tcps_sndrexmitpack;
}
-
+
/* packet reordering */
if (tcpstat.tcps_sndpack > 0 && tcpstat.tcps_reordered_pkts > 0) {
var = tcpstat.tcps_reordered_pkts << 10;
stat.send_reorder_rate =
- (var * 100) / tcpstat.tcps_sndpack;
+ (var * 100) / tcpstat.tcps_sndpack;
}
- if (tcp_ecn_outbound == 1)
+ if (tcp_ecn_outbound == 1) {
stat.ecn_client_enabled = 1;
- if (tcp_ecn_inbound == 1)
+ }
+ if (tcp_ecn_inbound == 1) {
stat.ecn_server_enabled = 1;
+ }
tcp_cumulative_stat(tcpstat.tcps_connattempt,
&prev.tcps_connattempt, &stat.connection_attempts);
tcp_cumulative_stat(tcpstat.tcps_accepts,
&prev.tcps_ecn_conn_pl_ce, &stat.ecn_conn_pl_ce);
tcp_cumulative_stat(tcpstat.tcps_ecn_conn_nopl_ce,
&prev.tcps_ecn_conn_nopl_ce, &stat.ecn_conn_nopl_ce);
+ tcp_cumulative_stat(tcpstat.tcps_ecn_fallback_synloss,
+ &prev.tcps_ecn_fallback_synloss, &stat.ecn_fallback_synloss);
+ tcp_cumulative_stat(tcpstat.tcps_ecn_fallback_reorder,
+ &prev.tcps_ecn_fallback_reorder, &stat.ecn_fallback_reorder);
+ tcp_cumulative_stat(tcpstat.tcps_ecn_fallback_ce,
+ &prev.tcps_ecn_fallback_ce, &stat.ecn_fallback_ce);
tcp_cumulative_stat(tcpstat.tcps_tfo_syn_data_rcv,
&prev.tcps_tfo_syn_data_rcv, &stat.tfo_syn_data_rcv);
tcp_cumulative_stat(tcpstat.tcps_tfo_cookie_req_rcv,
&prev.tcps_tfo_syn_loss, &stat.tfo_syn_loss);
tcp_cumulative_stat(tcpstat.tcps_tfo_blackhole,
&prev.tcps_tfo_blackhole, &stat.tfo_blackhole);
+ tcp_cumulative_stat(tcpstat.tcps_tfo_cookie_wrong,
+ &prev.tcps_tfo_cookie_wrong, &stat.tfo_cookie_wrong);
+ tcp_cumulative_stat(tcpstat.tcps_tfo_no_cookie_rcv,
+ &prev.tcps_tfo_no_cookie_rcv, &stat.tfo_no_cookie_rcv);
+ tcp_cumulative_stat(tcpstat.tcps_tfo_heuristics_disable,
+ &prev.tcps_tfo_heuristics_disable, &stat.tfo_heuristics_disable);
+ tcp_cumulative_stat(tcpstat.tcps_tfo_sndblackhole,
+ &prev.tcps_tfo_sndblackhole, &stat.tfo_sndblackhole);
+
+
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_handover_attempt,
+ &prev.tcps_mptcp_handover_attempt, &stat.mptcp_handover_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_interactive_attempt,
+ &prev.tcps_mptcp_interactive_attempt, &stat.mptcp_interactive_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_aggregate_attempt,
+ &prev.tcps_mptcp_aggregate_attempt, &stat.mptcp_aggregate_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_handover_attempt,
+ &prev.tcps_mptcp_fp_handover_attempt, &stat.mptcp_fp_handover_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_interactive_attempt,
+ &prev.tcps_mptcp_fp_interactive_attempt, &stat.mptcp_fp_interactive_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_aggregate_attempt,
+ &prev.tcps_mptcp_fp_aggregate_attempt, &stat.mptcp_fp_aggregate_attempt);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_heuristic_fallback,
+ &prev.tcps_mptcp_heuristic_fallback, &stat.mptcp_heuristic_fallback);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_heuristic_fallback,
+ &prev.tcps_mptcp_fp_heuristic_fallback, &stat.mptcp_fp_heuristic_fallback);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_handover_success_wifi,
+ &prev.tcps_mptcp_handover_success_wifi, &stat.mptcp_handover_success_wifi);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_handover_success_cell,
+ &prev.tcps_mptcp_handover_success_cell, &stat.mptcp_handover_success_cell);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_interactive_success,
+ &prev.tcps_mptcp_interactive_success, &stat.mptcp_interactive_success);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_aggregate_success,
+ &prev.tcps_mptcp_aggregate_success, &stat.mptcp_aggregate_success);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_handover_success_wifi,
+ &prev.tcps_mptcp_fp_handover_success_wifi, &stat.mptcp_fp_handover_success_wifi);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_handover_success_cell,
+ &prev.tcps_mptcp_fp_handover_success_cell, &stat.mptcp_fp_handover_success_cell);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_interactive_success,
+ &prev.tcps_mptcp_fp_interactive_success, &stat.mptcp_fp_interactive_success);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_fp_aggregate_success,
+ &prev.tcps_mptcp_fp_aggregate_success, &stat.mptcp_fp_aggregate_success);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_handover_cell_from_wifi,
+ &prev.tcps_mptcp_handover_cell_from_wifi, &stat.mptcp_handover_cell_from_wifi);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_handover_wifi_from_cell,
+ &prev.tcps_mptcp_handover_wifi_from_cell, &stat.mptcp_handover_wifi_from_cell);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_interactive_cell_from_wifi,
+ &prev.tcps_mptcp_interactive_cell_from_wifi, &stat.mptcp_interactive_cell_from_wifi);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_handover_cell_bytes,
+ &prev.tcps_mptcp_handover_cell_bytes, &stat.mptcp_handover_cell_bytes);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_interactive_cell_bytes,
+ &prev.tcps_mptcp_interactive_cell_bytes, &stat.mptcp_interactive_cell_bytes);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_aggregate_cell_bytes,
+ &prev.tcps_mptcp_aggregate_cell_bytes, &stat.mptcp_aggregate_cell_bytes);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_handover_all_bytes,
+ &prev.tcps_mptcp_handover_all_bytes, &stat.mptcp_handover_all_bytes);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_interactive_all_bytes,
+ &prev.tcps_mptcp_interactive_all_bytes, &stat.mptcp_interactive_all_bytes);
+ tcp_cumulative_stat64(tcpstat.tcps_mptcp_aggregate_all_bytes,
+ &prev.tcps_mptcp_aggregate_all_bytes, &stat.mptcp_aggregate_all_bytes);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_back_to_wifi,
+ &prev.tcps_mptcp_back_to_wifi, &stat.mptcp_back_to_wifi);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_wifi_proxy,
+ &prev.tcps_mptcp_wifi_proxy, &stat.mptcp_wifi_proxy);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_cell_proxy,
+ &prev.tcps_mptcp_cell_proxy, &stat.mptcp_cell_proxy);
+ tcp_cumulative_stat(tcpstat.tcps_mptcp_triggered_cell,
+ &prev.tcps_mptcp_triggered_cell, &stat.mptcp_triggered_cell);
nstat_sysinfo_send_data(&data);
-#undef stat
+#undef stat
}
void
}
listp->probe_if_index = probe_if_index;
- if (listp->running)
+ if (listp->running) {
goto done;
+ }
/*
* Reschedule the timerlist to run within the next 10ms, which is
tp->tentry.index = TCPT_KEEP;
tp->tentry.runtime = tcp_now +
TCP_TIMER_10MS_QUANTUM;
- if (tp->tentry.runtime == 0)
+ if (tp->tentry.runtime == 0) {
tp->tentry.runtime++;
+ }
}
}
}
((tp->t_flagsext & TF_DETECT_READSTALL) ||
tp->t_rtimo_probes > 0)) {
tcp_keepalive_reset(tp);
+
+ if (tp->t_mpsub) {
+ mptcp_reset_keepalive(tp);
+ }
}
}
struct inpcbinfo *pcbinfo = &tcbinfo;
struct inpcb *inp, *nxt;
- if (ifp == NULL)
+ if (ifp == NULL) {
return;
+ }
/* update clock */
calculate_tcp_clock();
LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, nxt) {
struct tcpcb *tp = NULL;
if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) ==
- WNT_STOPUSING)
+ WNT_STOPUSING) {
continue;
+ }
/* Acquire lock to look at the state of the connection */
- tcp_lock(inp->inp_socket, 1, 0);
+ socket_lock(inp->inp_socket, 1);
/* Release the want count */
- if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
- tcp_unlock(inp->inp_socket, 1, 0);
+ if (inp->inp_ppcb == NULL ||
+ (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING)) {
+ socket_unlock(inp->inp_socket, 1);
continue;
}
-
tp = intotcpcb(inp);
- if (enable)
+ if (enable) {
tcp_enable_read_probe(tp, ifp);
- else
+ } else {
tcp_disable_read_probe(tp);
+ }
- tcp_unlock(inp->inp_socket, 1, 0);
+ socket_unlock(inp->inp_socket, 1);
}
lck_rw_done(pcbinfo->ipi_lock);
return;
}
+inline void
+tcp_update_mss_core(struct tcpcb *tp, struct ifnet *ifp)
+{
+ struct if_cellular_status_v1 *ifsr;
+ u_int32_t optlen;
+ ifsr = &ifp->if_link_status->ifsr_u.ifsr_cell.if_cell_u.if_status_v1;
+ if (ifsr->valid_bitmask & IF_CELL_UL_MSS_RECOMMENDED_VALID) {
+ optlen = tp->t_maxopd - tp->t_maxseg;
+
+ if (ifsr->mss_recommended ==
+ IF_CELL_UL_MSS_RECOMMENDED_NONE &&
+ tp->t_cached_maxopd > 0 &&
+ tp->t_maxopd < tp->t_cached_maxopd) {
+ tp->t_maxopd = tp->t_cached_maxopd;
+ tcpstat.tcps_mss_to_default++;
+ } else if (ifsr->mss_recommended ==
+ IF_CELL_UL_MSS_RECOMMENDED_MEDIUM &&
+ tp->t_maxopd > tcp_mss_rec_medium) {
+ tp->t_cached_maxopd = tp->t_maxopd;
+ tp->t_maxopd = tcp_mss_rec_medium;
+ tcpstat.tcps_mss_to_medium++;
+ } else if (ifsr->mss_recommended ==
+ IF_CELL_UL_MSS_RECOMMENDED_LOW &&
+ tp->t_maxopd > tcp_mss_rec_low) {
+ tp->t_cached_maxopd = tp->t_maxopd;
+ tp->t_maxopd = tcp_mss_rec_low;
+ tcpstat.tcps_mss_to_low++;
+ }
+ tp->t_maxseg = tp->t_maxopd - optlen;
+
+ /*
+ * clear the cached value if it is same as the current
+ */
+ if (tp->t_maxopd == tp->t_cached_maxopd) {
+ tp->t_cached_maxopd = 0;
+ }
+ }
+}
+
+void
+tcp_update_mss_locked(struct socket *so, struct ifnet *ifp)
+{
+ struct inpcb *inp = sotoinpcb(so);
+ struct tcpcb *tp = intotcpcb(inp);
+
+ if (ifp == NULL && (ifp = inp->inp_last_outifp) == NULL) {
+ return;
+ }
+
+ if (!IFNET_IS_CELLULAR(ifp)) {
+ /*
+ * This optimization is implemented for cellular
+ * networks only
+ */
+ return;
+ }
+ if (tp->t_state <= TCPS_CLOSE_WAIT) {
+ /*
+ * If the connection is currently doing or has done PMTU
+ * blackhole detection, do not change the MSS
+ */
+ if (tp->t_flags & TF_BLACKHOLE) {
+ return;
+ }
+ if (ifp->if_link_status == NULL) {
+ return;
+ }
+ tcp_update_mss_core(tp, ifp);
+ }
+}
+
void
tcp_itimer(struct inpcbinfo *ipi)
{
LIST_FOREACH_SAFE(inp, &tcb, inp_list, nxt) {
struct socket *so;
+ struct ifnet *ifp;
- if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING)
+ if (inp->inp_ppcb == NULL ||
+ in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING) {
continue;
+ }
so = inp->inp_socket;
- tcp_lock(so, 1, 0);
+ ifp = inp->inp_last_outifp;
+ socket_lock(so, 1);
if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
- tcp_unlock(so, 1, 0);
+ socket_unlock(so, 1);
continue;
}
so_check_extended_bk_idle_time(so);
- tcp_unlock(so, 1, 0);
+ if (ipi->ipi_flags & INPCBINFO_UPDATE_MSS) {
+ tcp_update_mss_locked(so, NULL);
+ }
+ socket_unlock(so, 1);
+
+ /*
+ * Defunct all system-initiated background sockets if the
+ * socket is using the cellular interface and the interface
+ * has its LQM set to abort.
+ */
+ if ((ipi->ipi_flags & INPCBINFO_HANDLE_LQM_ABORT) &&
+ IS_SO_TC_BACKGROUNDSYSTEM(so->so_traffic_class) &&
+ ifp != NULL && IFNET_IS_CELLULAR(ifp) &&
+ (ifp->if_interface_state.valid_bitmask &
+ IF_INTERFACE_STATE_LQM_STATE_VALID) &&
+ ifp->if_interface_state.lqm_state ==
+ IFNET_LQM_THRESH_ABORT) {
+ socket_defunct(current_proc(), so,
+ SHUTDOWN_SOCKET_LEVEL_DISCONNECT_ALL);
+ }
}
+ ipi->ipi_flags &= ~(INPCBINFO_UPDATE_MSS | INPCBINFO_HANDLE_LQM_ABORT);
lck_rw_done(ipi->ipi_lock);
}
-
projects / apple / xnu.git / blobdiff