tcp_timewait.c File Reference

#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_tcpdebug.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <sys/protosw.h>
#include <sys/random.h>
#include <vm/uma.h>
#include <net/route.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_kdtrace.h>
#include <netinet/in_pcb.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_hpts.h>
#include <netinet/tcpip.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netipsec/ipsec_support.h>
#include <machine/in_cksum.h>
#include <security/mac/mac_framework.h>

Include dependency graph for tcp_timewait.c:

Go to the source code of this file.

Macros
#define	V_tcptw_zone   VNET(tcptw_zone)
#define	V_twq_2msl   VNET(twq_2msl)
#define	V_tw_lock   VNET(tw_lock)
#define	TW_LOCK_INIT(tw, d)   rw_init_flags(&(tw), (d), 0)
#define	TW_LOCK_DESTROY(tw)   rw_destroy(&(tw))
#define	TW_RLOCK(tw)   rw_rlock(&(tw))
#define	TW_WLOCK(tw)   rw_wlock(&(tw))
#define	TW_RUNLOCK(tw)   rw_runlock(&(tw))
#define	TW_WUNLOCK(tw)   rw_wunlock(&(tw))
#define	TW_LOCK_ASSERT(tw)   rw_assert(&(tw), RA_LOCKED)
#define	TW_RLOCK_ASSERT(tw)   rw_assert(&(tw), RA_RLOCKED)
#define	TW_WLOCK_ASSERT(tw)   rw_assert(&(tw), RA_WLOCKED)
#define	TW_UNLOCK_ASSERT(tw)   rw_assert(&(tw), RA_UNLOCKED)
#define	V_nolocaltimewait   VNET(nolocaltimewait)

Functions
	__FBSDID ("$FreeBSD$")
	VNET_DEFINE_STATIC (uma_zone_t, tcptw_zone)
	VNET_DEFINE_STATIC (TAILQ_HEAD(, tcptw), twq_2msl)
	VNET_DEFINE_STATIC (struct rwlock, tw_lock)
static void	tcp_tw_2msl_reset (struct tcptw *, int)
static void	tcp_tw_2msl_stop (struct tcptw *, int)
static int	tcp_twrespond (struct tcptw *, int)
static int	tcptw_auto_size (void)
static int	sysctl_maxtcptw (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_net_inet_tcp, OID_AUTO, maxtcptw, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_NEEDGIANT, &maxtcptw, 0, sysctl_maxtcptw, "IU", "Maximum number of compressed TCP TIME_WAIT entries")
	VNET_DEFINE_STATIC (bool, nolocaltimewait)
	SYSCTL_BOOL (_net_inet_tcp, OID_AUTO, nolocaltimewait, CTLFLAG_VNET|CTLFLAG_RW, &VNET_NAME(nolocaltimewait), true, "Do not create compressed TCP TIME_WAIT entries for local connections")
void	tcp_tw_zone_change (void)
void	tcp_tw_init (void)
void	tcp_twstart (struct tcpcb *tp)
int	tcp_twcheck (struct inpcb *inp, struct tcpopt *to, struct tcphdr *th, struct mbuf *m, int tlen)
void	tcp_twclose (struct tcptw *tw, int reuse)
struct tcptw *	tcp_tw_2msl_scan (int reuse)

Variables
static int	maxtcptw

Macro Definition Documentation

TW_LOCK_ASSERT

#define TW_LOCK_ASSERT

(

tw

)

rw_assert(&(tw), RA_LOCKED)

Definition at line 135 of file tcp_timewait.c.

TW_LOCK_DESTROY

#define TW_LOCK_DESTROY

(

tw

)

rw_destroy(&(tw))

Definition at line 130 of file tcp_timewait.c.

TW_LOCK_INIT

#define TW_LOCK_INIT	(		tw,
			d
	)		rw_init_flags(&(tw), (d), 0)

Definition at line 129 of file tcp_timewait.c.

TW_RLOCK

#define TW_RLOCK

(

tw

)

rw_rlock(&(tw))

Definition at line 131 of file tcp_timewait.c.

TW_RLOCK_ASSERT

#define TW_RLOCK_ASSERT

(

tw

)

rw_assert(&(tw), RA_RLOCKED)

Definition at line 136 of file tcp_timewait.c.

TW_RUNLOCK

#define TW_RUNLOCK

(

tw

)

rw_runlock(&(tw))

Definition at line 133 of file tcp_timewait.c.

TW_UNLOCK_ASSERT

#define TW_UNLOCK_ASSERT

(

tw

)

rw_assert(&(tw), RA_UNLOCKED)

Definition at line 138 of file tcp_timewait.c.

TW_WLOCK

#define TW_WLOCK

(

tw

)

rw_wlock(&(tw))

Definition at line 132 of file tcp_timewait.c.

TW_WLOCK_ASSERT

#define TW_WLOCK_ASSERT

(

tw

)

rw_assert(&(tw), RA_WLOCKED)

Definition at line 137 of file tcp_timewait.c.

TW_WUNLOCK

#define TW_WUNLOCK

(

tw

)

rw_wunlock(&(tw))

Definition at line 134 of file tcp_timewait.c.

V_nolocaltimewait

#define V_nolocaltimewait   VNET(nolocaltimewait)

Definition at line 185 of file tcp_timewait.c.

V_tcptw_zone

#define V_tcptw_zone   VNET(tcptw_zone)

Definition at line 108 of file tcp_timewait.c.

V_tw_lock

#define V_tw_lock   VNET(tw_lock)

Definition at line 127 of file tcp_timewait.c.

V_twq_2msl

#define V_twq_2msl   VNET(twq_2msl)

Definition at line 123 of file tcp_timewait.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

SYSCTL_BOOL()

SYSCTL_BOOL	(	_net_inet_tcp	,
		OID_AUTO	,
		nolocaltimewait	,
		CTLFLAG_VNET|	CTLFLAG_RW,
		&	VNET_NAMEnolocaltimewait,
		true	,
		"Do not create compressed TCP TIME_WAIT entries for local connections"
	)

sysctl_maxtcptw()

static int sysctl_maxtcptw ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 162 of file tcp_timewait.c.

References maxtcptw, tcptw_auto_size(), and V_tcptw_zone.

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SYSCTL_PROC()

SYSCTL_PROC	(	_net_inet_tcp	,
		OID_AUTO	,
		maxtcptw	,
		CTLTYPE_INT|CTLFLAG_RW|	CTLFLAG_NEEDGIANT,
		&	maxtcptw,
		0	,
		sysctl_maxtcptw	,
		"IU"	,
		"Maximum number of compressed TCP TIME_WAIT entries"
	)

tcp_tw_2msl_reset()

static void tcp_tw_2msl_reset ( struct tcptw *  tw, int  rearm  )

static

Definition at line 759 of file tcp_timewait.c.

References INP_WLOCK_ASSERT, tcptw::tw_inpcb, tcptw::tw_time, TW_WLOCK, TW_WUNLOCK, V_tcp_msl, V_tw_lock, and V_twq_2msl.

Referenced by tcp_twcheck(), and tcp_twstart().

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tcp_tw_2msl_scan()

struct tcptw * tcp_tw_2msl_scan

(

int

reuse

)

Definition at line 803 of file tcp_timewait.c.

References in_pcbref(), in_pcbrele_wlocked(), INP_WLOCK, INP_WUNLOCK, intotw, tcp_twclose(), tcptw::tw_inpcb, TW_RLOCK, TW_RUNLOCK, tcptw::tw_time, V_tw_lock, and V_twq_2msl.

Referenced by tcp_slowtimo(), and tcp_twstart().

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tcp_tw_2msl_stop()

static void tcp_tw_2msl_stop ( struct tcptw *  tw, int  reuse  )

static

Definition at line 774 of file tcp_timewait.c.

References in_pcbrele_wlocked(), TCPS_TIME_WAIT, TCPSTATES_DEC, tcptw::tw_cred, tcptw::tw_inpcb, TW_WLOCK, TW_WUNLOCK, V_tcptw_zone, V_tw_lock, and V_twq_2msl.

Referenced by tcp_twclose().

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tcp_tw_init()

void tcp_tw_init

(

void

)

Definition at line 199 of file tcp_timewait.c.

References maxtcptw, tcptw_auto_size(), TW_LOCK_INIT, V_tcptw_zone, V_tw_lock, and V_twq_2msl.

Referenced by tcp_vnet_init().

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tcp_tw_zone_change()

void tcp_tw_zone_change

(

void

)

Definition at line 191 of file tcp_timewait.c.

References maxtcptw, tcptw_auto_size(), and V_tcptw_zone.

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tcp_twcheck()

int tcp_twcheck	(	struct inpcb *	inp,
		struct tcpopt *	to,
		struct tcphdr *	th,
		struct mbuf *	m,
		int	tlen
	)

Definition at line 392 of file tcp_timewait.c.

References INP_LOCK_ASSERT, INP_RLOCK_ASSERT, INP_TRY_UPGRADE, INP_UNLOCK, INP_WLOCK_ASSERT, intotw, tcptw::rcv_nxt, SEQ_GT, tcptw::snd_nxt, tcptw::t_port, tcptw::t_recent, tcp_get_flags(), TCP_PROBE5, tcp_respond(), tcp_tw_2msl_reset(), tcp_twclose(), tcp_twrespond(), TCPSTAT_INC, tcpopt::to_flags, tcpopt::to_tsval, TOF_TS, TSTMP_LT, and V_tcp_tolerate_missing_ts.

Referenced by tcp_input_with_port(), and toe_4tuple_check().

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tcp_twclose()

void tcp_twclose	(	struct tcptw *	tw,
		int	reuse
	)

Definition at line 541 of file tcp_timewait.c.

References in_pcbdrop(), in_pcbfree(), inpcb::inp_flags, inpcb::inp_ppcb, inpcb::inp_socket, INP_SOCKREF, INP_TIMEWAIT, INP_WLOCK_ASSERT, INP_WUNLOCK, intotw, tcp_tw_2msl_stop(), TCPSTAT_INC, and tcptw::tw_inpcb.

Referenced by sysctl_drop(), tcp_tw_2msl_scan(), and tcp_twcheck().

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tcp_twrespond()

static int tcp_twrespond ( struct tcptw *  tw, int  flags  )

static

Definition at line 600 of file tcp_timewait.c.

References inpcb::in6p_outputopts, in_pseudo(), in_conninfo::inc_flags, INC_ISIPV6, inpcb::inp_inc, inpcb::inp_options, INP_WLOCK_ASSERT, IP_DF, ip::ip_dst, ip::ip_len, ip::ip_off, ip_output(), IP_ROUTETOIF, IPPROTO_TCP, IPPROTO_UDP, tcptw::last_win, tcptw::rcv_nxt, in_addr::s_addr, tcptw::snd_nxt, tcptw::t_port, tcptw::t_recent, tcp_addoptions(), TCP_PROBE5, tcp_set_flags(), tcp_ts_getticks(), tcpip_fillheaders(), TCPSTAT_INC, TF_SIGNATURE, tcpopt::to_flags, tcpopt::to_signature, tcpopt::to_tsecr, tcpopt::to_tsval, TOF_SIGNATURE, TOF_TS, tcptw::ts_offset, tcptw::tw_flags, tcptw::tw_inpcb, tcptw::tw_so_options, udphdr::uh_dport, udphdr::uh_sport, udphdr::uh_sum, udphdr::uh_ulen, V_path_mtu_discovery, and V_tcp_udp_tunneling_port.

Referenced by tcp_twcheck(), and tcp_twstart().

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tcp_twstart()

void tcp_twstart

(

struct tcpcb *

tp

)

Definition at line 236 of file tcp_timewait.c.

References in_localip(), in_pcbdrop(), in_pcbref(), in_conninfo::inc_flags, INC_ISIPV6, INP_DROPPED, inpcb::inp_flags, inpcb::inp_inc, inpcb::inp_ppcb, inpcb::inp_socket, INP_SOCKREF, INP_TIMEWAIT, INP_WLOCK_ASSERT, INP_WUNLOCK, tcptw::last_win, tcpcb::rcv_adv, tcpcb::rcv_nxt, tcptw::rcv_nxt, tcpcb::rcv_scale, SEQ_GT, tcpcb::snd_nxt, tcptw::snd_nxt, tcpcb::t_flags, tcpcb::t_inpcb, tcpcb::t_port, tcptw::t_port, tcptw::t_recent, tcp_discardcb(), tcp_hpts_remove(), tcp_state_change(), tcp_tw_2msl_reset(), tcp_tw_2msl_scan(), tcp_twrespond(), TCPS_TIME_WAIT, TCPSTATES_INC, TF_ACKNOW, TF_NOOPT, TF_RCVD_TSTMP, TF_REQ_TSTMP, tcpcb::ts_offset, tcptw::ts_offset, tcpcb::ts_recent, tcptw::tw_cred, tcptw::tw_flags, tcptw::tw_inpcb, tcptw::tw_so_options, tcptw::tw_time, V_nolocaltimewait, and V_tcptw_zone.

Referenced by bbr_do_closing(), bbr_process_data(), rack_do_closing(), rack_do_compressed_ack_processing(), rack_process_data(), and tcp_do_segment().

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tcptw_auto_size()

static int tcptw_auto_size ( void  )

static

Definition at line 145 of file tcp_timewait.c.

References V_ipport_firstauto, and V_ipport_lastauto.

Referenced by sysctl_maxtcptw(), tcp_tw_init(), and tcp_tw_zone_change().

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VNET_DEFINE_STATIC() [1/4]

VNET_DEFINE_STATIC	(	bool	,
		nolocaltimewait
	)

VNET_DEFINE_STATIC() [2/4]

VNET_DEFINE_STATIC	(	struct rwlock	,
		tw_lock
	)

VNET_DEFINE_STATIC() [3/4]

VNET_DEFINE_STATIC	(	TAILQ_HEAD(, tcptw)	,
		twq_2msl
	)

VNET_DEFINE_STATIC() [4/4]

VNET_DEFINE_STATIC	(	uma_zone_t	,
		tcptw_zone
	)

Variable Documentation

maxtcptw

int maxtcptw

static

Definition at line 109 of file tcp_timewait.c.

Referenced by sysctl_maxtcptw(), tcp_tw_init(), and tcp_tw_zone_change().