/* $NetBSD: tcp_var.h,v 1.93 2002/06/30 22:40:36 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
*
* NRL grants permission for redistribution and use in source and binary
* forms, with or without modification, of the software and documentation
* created at NRL provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgements:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed at the Information
* Technology Division, US Naval Research Laboratory.
* 4. Neither the name of the NRL nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the US Naval
* Research Laboratory (NRL).
*/
/*-
* Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1993, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
*/
#ifndef _NETINET_TCP_VAR_H_
#define _NETINET_TCP_VAR_H_
#if defined(_KERNEL_OPT)
#include "opt_inet.h"
#endif
/*
* Kernel variables for tcp.
*/
#include <sys/callout.h>
/*
* Tcp control block, one per tcp; fields:
*/
struct tcpcb {
int t_family; /* address family on the wire */
struct ipqehead segq; /* sequencing queue */
struct callout t_timer[TCPT_NTIMERS];/* tcp timers */
short t_state; /* state of this connection */
short t_rxtshift; /* log(2) of rexmt exp. backoff */
uint32_t t_rxtcur; /* current retransmit value */
short t_dupacks; /* consecutive dup acks recd */
u_short t_peermss; /* peer's maximum segment size */
u_short t_ourmss; /* our's maximum segment size */
u_short t_segsz; /* current segment size in use */
char t_force; /* 1 if forcing out a byte */
u_int t_flags;
#define TF_ACKNOW 0x0001 /* ack peer immediately */
#define TF_DELACK 0x0002 /* ack, but try to delay it */
#define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
#define TF_NOOPT 0x0008 /* don't use tcp options */
#define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
#define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
#define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
#define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
#define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
#define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */
#define TF_WILL_SACK 0x0800 /* try to use SACK */
#define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */
#define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */
#define TF_REASSEMBLING 0x4000 /* we're busy reassembling */
struct mbuf *t_template; /* skeletal packet for transmit */
struct inpcb *t_inpcb; /* back pointer to internet pcb */
struct in6pcb *t_in6pcb; /* back pointer to internet pcb */
struct callout t_delack_ch; /* delayed ACK callout */
/*
* The following fields are used as in the protocol specification.
* See RFC783, Dec. 1981, page 21.
*/
/* send sequence variables */
tcp_seq snd_una; /* send unacknowledged */
tcp_seq snd_nxt; /* send next */
tcp_seq snd_up; /* send urgent pointer */
tcp_seq snd_wl1; /* window update seg seq number */
tcp_seq snd_wl2; /* window update seg ack number */
tcp_seq iss; /* initial send sequence number */
u_long snd_wnd; /* send window */
tcp_seq snd_recover; /* for use in fast recovery */
/* receive sequence variables */
u_long rcv_wnd; /* receive window */
tcp_seq rcv_nxt; /* receive next */
tcp_seq rcv_up; /* receive urgent pointer */
tcp_seq irs; /* initial receive sequence number */
/*
* Additional variables for this implementation.
*/
/* receive variables */
tcp_seq rcv_adv; /* advertised window */
/* retransmit variables */
tcp_seq snd_max; /* highest sequence number sent;
* used to recognize retransmits
*/
/* congestion control (for slow start, source quench, retransmit after loss) */
u_long snd_cwnd; /* congestion-controlled window */
u_long snd_ssthresh; /* snd_cwnd size threshhold for
* for slow start exponential to
* linear switch
*/
/*
* transmit timing stuff. See below for scale of srtt and rttvar.
* "Variance" is actually smoothed difference.
*/
uint32_t t_rcvtime; /* time last segment received */
uint32_t t_rtttime; /* time we started measuring rtt */
tcp_seq t_rtseq; /* sequence number being timed */
int32_t t_srtt; /* smoothed round-trip time */
int32_t t_rttvar; /* variance in round-trip time */
uint32_t t_rttmin; /* minimum rtt allowed */
u_long max_sndwnd; /* largest window peer has offered */
/* out-of-band data */
char t_oobflags; /* have some */
char t_iobc; /* input character */
#define TCPOOB_HAVEDATA 0x01
#define TCPOOB_HADDATA 0x02
short t_softerror; /* possible error not yet reported */
/* RFC 1323 variables */
u_char snd_scale; /* window scaling for send window */
u_char rcv_scale; /* window scaling for recv window */
u_char request_r_scale; /* pending window scaling */
u_char requested_s_scale;
u_int32_t ts_recent; /* timestamp echo data */
u_int32_t ts_recent_age; /* when last updated */
u_int32_t ts_timebase; /* our timebase */
tcp_seq last_ack_sent;
/* SACK stuff */
struct ipqehead timeq; /* time sequenced queue (for SACK) */
/* path MTU discovery blackhole detection */
int t_mtudisc; /* perform mtudisc for this tcb */
/* pointer for syn cache entries*/
LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
};
#ifdef _KERNEL
/*
* TCP reassembly queue locks.
*/
static __inline int tcp_reass_lock_try __P((struct tcpcb *))
__attribute__((__unused__));
static __inline void tcp_reass_unlock __P((struct tcpcb *))
__attribute__((__unused__));
static __inline int
tcp_reass_lock_try(tp)
struct tcpcb *tp;
{
int s;
/*
* Use splvm() -- we're blocking things that would cause
* mbuf allocation.
*/
s = splvm();
if (tp->t_flags & TF_REASSEMBLING) {
splx(s);
return (0);
}
tp->t_flags |= TF_REASSEMBLING;
splx(s);
return (1);
}
static __inline void
tcp_reass_unlock(tp)
struct tcpcb *tp;
{
int s;
s = splvm();
tp->t_flags &= ~TF_REASSEMBLING;
splx(s);
}
#ifdef DIAGNOSTIC
#define TCP_REASS_LOCK(tp) \
do { \
if (tcp_reass_lock_try(tp) == 0) { \
printf("%s:%d: tcpcb %p reass already locked\n", \
__FILE__, __LINE__, tp); \
panic("tcp_reass_lock"); \
} \
} while (0)
#define TCP_REASS_LOCK_CHECK(tp) \
do { \
if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \
printf("%s:%d: tcpcb %p reass lock not held\n", \
__FILE__, __LINE__, tp); \
panic("tcp reass lock check"); \
} \
} while (0)
#else
#define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp))
#define TCP_REASS_LOCK_CHECK(tp) /* nothing */
#endif
#define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp))
#endif /* _KERNEL */
/*
* Queue for delayed ACK processing.
*/
#ifdef _KERNEL
extern int tcp_delack_ticks;
void tcp_delack(void *);
#define TCP_RESTART_DELACK(tp) \
callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \
tcp_delack, tp)
#define TCP_SET_DELACK(tp) \
do { \
if (((tp)->t_flags & TF_DELACK) == 0) { \
(tp)->t_flags |= TF_DELACK; \
TCP_RESTART_DELACK(tp); \
} \
} while (/*CONSTCOND*/0)
#define TCP_CLEAR_DELACK(tp) \
do { \
if ((tp)->t_flags & TF_DELACK) { \
(tp)->t_flags &= ~TF_DELACK; \
callout_stop(&(tp)->t_delack_ch); \
} \
} while (/*CONSTCOND*/0)
#endif /* _KERNEL */
/*
* Compute the current timestamp for a connection.
*/
#define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase)
/*
* Handy way of passing around TCP option info.
*/
struct tcp_opt_info {
int ts_present;
u_int32_t ts_val;
u_int32_t ts_ecr;
u_int16_t maxseg;
};
/*
* Data for the TCP compressed state engine.
*/
union syn_cache_sa {
struct sockaddr sa;
struct sockaddr_in sin;
#if 1 /*def INET6*/
struct sockaddr_in6 sin6;
#endif
};
struct syn_cache {
TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
struct callout sc_timer; /* rexmt timer */
union { /* cached route */
struct route route4;
#ifdef INET6
struct route_in6 route6;
#endif
} sc_route_u;
#define sc_route4 sc_route_u.route4
#ifdef INET6
#define sc_route6 sc_route_u.route6
#endif
long sc_win; /* advertised window */
int sc_bucketidx; /* our bucket index */
u_int32_t sc_hash;
u_int32_t sc_timestamp; /* timestamp from SYN */
u_int32_t sc_timebase; /* our local timebase */
union syn_cache_sa sc_src;
union syn_cache_sa sc_dst;
tcp_seq sc_irs;
tcp_seq sc_iss;
u_int sc_rxtcur; /* current rxt timeout */
u_int sc_rxttot; /* total time spend on queues */
u_short sc_rxtshift; /* for computing backoff */
u_short sc_flags;
#define SCF_UNREACH 0x0001 /* we've had an unreach error */
#define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
struct mbuf *sc_ipopts; /* IP options */
u_int16_t sc_peermaxseg;
u_int16_t sc_ourmaxseg;
u_int8_t sc_request_r_scale : 4,
sc_requested_s_scale : 4;
struct tcpcb *sc_tp; /* tcb for listening socket */
LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
};
struct syn_cache_head {
TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
u_short sch_length; /* # entries in bucket */
};
#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
#ifdef INET6
#define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb)
#endif
#ifndef INET6
#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
#else
#define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \
? intotcpcb(sotoinpcb(so)) \
: in6totcpcb(sotoin6pcb(so)))
#endif
/*
* The smoothed round-trip time and estimated variance
* are stored as fixed point numbers scaled by the values below.
* For convenience, these scales are also used in smoothing the average
* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
* With these scales, srtt has 3 bits to the right of the binary point,
* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
* binary point, and is smoothed with an ALPHA of 0.75.
*/
#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
#define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
/*
* The initial retransmission should happen at rtt + 4 * rttvar.
* Because of the way we do the smoothing, srtt and rttvar
* will each average +1/2 tick of bias. When we compute
* the retransmit timer, we want 1/2 tick of rounding and
* 1 extra tick because of +-1/2 tick uncertainty in the
* firing of the timer. The bias will give us exactly the
* 1.5 tick we need. But, because the bias is
* statistical, we have to test that we don't drop below
* the minimum feasible timer (which is 2 ticks).
* This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT
* is the same as the multiplier for rttvar.
*/
#define TCP_REXMTVAL(tp) \
((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
/*
* Compute the initial window for slow start.
*/
#define TCP_INITIAL_WINDOW(iw, segsz) \
(((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \
((segsz) * (iw)))
/*
* TCP statistics.
* Many of these should be kept per connection,
* but that's inconvenient at the moment.
*/
struct tcpstat {
u_quad_t tcps_connattempt; /* connections initiated */
u_quad_t tcps_accepts; /* connections accepted */
u_quad_t tcps_connects; /* connections established */
u_quad_t tcps_drops; /* connections dropped */
u_quad_t tcps_conndrops; /* embryonic connections dropped */
u_quad_t tcps_closed; /* conn. closed (includes drops) */
u_quad_t tcps_segstimed; /* segs where we tried to get rtt */
u_quad_t tcps_rttupdated; /* times we succeeded */
u_quad_t tcps_delack; /* delayed acks sent */
u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
u_quad_t tcps_rexmttimeo; /* retransmit timeouts */
u_quad_t tcps_persisttimeo; /* persist timeouts */
u_quad_t tcps_keeptimeo; /* keepalive timeouts */
u_quad_t tcps_keepprobe; /* keepalive probes sent */
u_quad_t tcps_keepdrops; /* connections dropped in keepalive */
u_quad_t tcps_persistdrops; /* connections dropped in persist */
u_quad_t tcps_connsdrained; /* connections drained due to memory
shortage */
u_quad_t tcps_pmtublackhole; /* PMTUD blackhole detected */
u_quad_t tcps_sndtotal; /* total packets sent */
u_quad_t tcps_sndpack; /* data packets sent */
u_quad_t tcps_sndbyte; /* data bytes sent */
u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */
u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */
u_quad_t tcps_sndacks; /* ack-only packets sent */
u_quad_t tcps_sndprobe; /* window probes sent */
u_quad_t tcps_sndurg; /* packets sent with URG only */
u_quad_t tcps_sndwinup; /* window update-only packets sent */
u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
u_quad_t tcps_rcvtotal; /* total packets received */
u_quad_t tcps_rcvpack; /* packets received in sequence */
u_quad_t tcps_rcvbyte; /* bytes received in sequence */
u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */
u_quad_t tcps_rcvbadoff; /* packets received with bad offset */
u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
u_quad_t tcps_rcvshort; /* packets received too short */
u_quad_t tcps_rcvduppack; /* duplicate-only packets received */
u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */
u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */
u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
u_quad_t tcps_rcvoopack; /* out-of-order packets received */
u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */
u_quad_t tcps_rcvpackafterwin; /* packets with data after window */
u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */
u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */
u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */
u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
u_quad_t tcps_rcvackpack; /* rcvd ack packets */
u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
u_quad_t tcps_rcvwinupd; /* rcvd window update packets */
u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */
u_quad_t tcps_predack; /* times hdr predict ok for acks */
u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */
u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */
u_quad_t tcps_noport; /* no socket on port */
u_quad_t tcps_badsyn; /* received ack for which we have
no SYN in compressed state */
/* These statistics deal with the SYN cache. */
u_quad_t tcps_sc_added; /* # of entries added */
u_quad_t tcps_sc_completed; /* # of connections completed */
u_quad_t tcps_sc_timed_out; /* # of entries timed out */
u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */
u_quad_t tcps_sc_reset; /* # dropped due to RST */
u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */
u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
u_quad_t tcps_sc_collisions; /* # of hash collisions */
u_quad_t tcps_sc_retransmitted; /* # of retransmissions */
u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */
};
/*
* Names for TCP sysctl objects.
*/
#define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */
#define TCPCTL_SENDSPACE 2 /* default send buffer */
#define TCPCTL_RECVSPACE 3 /* default recv buffer */
#define TCPCTL_MSSDFLT 4 /* default seg size */
#define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */
#define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */
#if 0 /*obsoleted*/
#define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */
#endif
#define TCPCTL_INIT_WIN 8 /* initial window */
#define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */
#define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */
#define TCPCTL_WSCALE 11 /* RFC1323 window scaling */
#define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */
#define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */
#define TCPCTL_CWM 14 /* Congestion Window Monitoring */
#define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */
#define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */
#define TCPCTL_KEEPIDLE 17 /* keepalive idle time */
#define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */
#define TCPCTL_KEEPCNT 19 /* keepalive count */
#define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */
#define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */
#define TCPCTL_LOG_REFUSED 22 /* Log refused connections */
#if 0 /*obsoleted*/
#define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */
#endif
#define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */
#define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */
#define TCPCTL_MAXID 26
#define TCPCTL_NAMES { \
{ 0, 0 }, \
{ "rfc1323", CTLTYPE_INT }, \
{ "sendspace", CTLTYPE_INT }, \
{ "recvspace", CTLTYPE_INT }, \
{ "mssdflt", CTLTYPE_INT }, \
{ "syn_cache_limit", CTLTYPE_INT }, \
{ "syn_bucket_limit", CTLTYPE_INT }, \
{ 0, 0 },\
{ "init_win", CTLTYPE_INT }, \
{ "mss_ifmtu", CTLTYPE_INT }, \
{ "sack", CTLTYPE_INT }, \
{ "win_scale", CTLTYPE_INT }, \
{ "timestamps", CTLTYPE_INT }, \
{ "compat_42", CTLTYPE_INT }, \
{ "cwm", CTLTYPE_INT }, \
{ "cwm_burstsize", CTLTYPE_INT }, \
{ "ack_on_push", CTLTYPE_INT }, \
{ "keepidle", CTLTYPE_INT }, \
{ "keepintvl", CTLTYPE_INT }, \
{ "keepcnt", CTLTYPE_INT }, \
{ "slowhz", CTLTYPE_INT }, \
{ "newreno", CTLTYPE_INT }, \
{ "log_refused",CTLTYPE_INT }, \
{ 0, 0 }, \
{ "rstppslimit", CTLTYPE_INT }, \
{ "delack_ticks", CTLTYPE_INT }, \
}
#ifdef _KERNEL
extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
#ifdef INET6
extern struct in6pcb tcb6;
#endif
extern struct tcpstat tcpstat; /* tcp statistics */
extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
extern int tcp_do_rfc1323; /* enabled/disabled? */
extern int tcp_do_sack; /* SACK enabled/disabled? */
extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */
extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */
extern int tcp_do_newreno; /* Use the New Reno algorithms */
extern int tcp_mssdflt; /* default seg size */
extern int tcp_init_win; /* initial window */
extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */
extern int tcp_compat_42; /* work around ancient broken TCP peers */
extern int tcp_cwm; /* enable Congestion Window Monitoring */
extern int tcp_cwm_burstsize; /* burst size allowed by CWM */
extern int tcp_ack_on_push; /* ACK immediately on PUSH */
extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
extern int tcp_log_refused; /* log refused connections */
extern int tcp_rst_ppslim;
extern int tcp_syn_cache_size;
extern struct syn_cache_head tcp_syn_cache[];
extern u_long syn_cache_count;
#define TCPCTL_VARIABLES { \
{ 0 }, \
{ 1, 0, &tcp_do_rfc1323 }, \
{ 1, 0, &tcp_sendspace }, \
{ 1, 0, &tcp_recvspace }, \
{ 1, 0, &tcp_mssdflt }, \
{ 1, 0, &tcp_syn_cache_limit }, \
{ 1, 0, &tcp_syn_bucket_limit }, \
{ 0 }, \
{ 1, 0, &tcp_init_win }, \
{ 1, 0, &tcp_mss_ifmtu }, \
{ 1, 0, &tcp_do_sack }, \
{ 1, 0, &tcp_do_win_scale }, \
{ 1, 0, &tcp_do_timestamps }, \
{ 1, 0, &tcp_compat_42 }, \
{ 1, 0, &tcp_cwm }, \
{ 1, 0, &tcp_cwm_burstsize }, \
{ 1, 0, &tcp_ack_on_push }, \
{ 1, 0, &tcp_keepidle }, \
{ 1, 0, &tcp_keepintvl }, \
{ 1, 0, &tcp_keepcnt }, \
{ 1, 1, 0, PR_SLOWHZ }, \
{ 1, 0, &tcp_do_newreno }, \
{ 1, 0, &tcp_log_refused }, \
{ 0 }, \
{ 1, 0, &tcp_rst_ppslim }, \
{ 1, 0, &tcp_delack_ticks }, \
}
#ifdef __NO_STRICT_ALIGNMENT
#define TCP_HDR_ALIGNED_P(th) 1
#else
#define TCP_HDR_ALIGNED_P(th) ((((vaddr_t) (th)) & 3) == 0)
#endif
int tcp_attach __P((struct socket *));
void tcp_canceltimers __P((struct tcpcb *));
struct tcpcb *
tcp_close __P((struct tcpcb *));
#ifdef INET6
void tcp6_ctlinput __P((int, struct sockaddr *, void *));
#endif
void *tcp_ctlinput __P((int, struct sockaddr *, void *));
int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
struct tcpcb *
tcp_disconnect __P((struct tcpcb *));
struct tcpcb *
tcp_drop __P((struct tcpcb *, int));
void tcp_dooptions __P((struct tcpcb *,
u_char *, int, struct tcphdr *, struct tcp_opt_info *));
void tcp_drain __P((void));
#ifdef INET6
void tcp6_drain __P((void));
#endif
void tcp_established __P((struct tcpcb *));
void tcp_init __P((void));
#ifdef INET6
int tcp6_input __P((struct mbuf **, int *, int));
#endif
void tcp_input __P((struct mbuf *, ...));
u_long tcp_mss_to_advertise __P((const struct ifnet *, int));
void tcp_mss_from_peer __P((struct tcpcb *, int));
struct tcpcb *
tcp_newtcpcb __P((int, void *));
void tcp_notify __P((struct inpcb *, int));
#ifdef INET6
void tcp6_notify __P((struct in6pcb *, int));
#endif
u_int tcp_optlen __P((struct tcpcb *));
int tcp_output __P((struct tcpcb *));
void tcp_pulloutofband __P((struct socket *,
struct tcphdr *, struct mbuf *, int));
void tcp_quench __P((struct inpcb *, int));
#ifdef INET6
void tcp6_quench __P((struct in6pcb *, int));
#endif
int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *));
int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *,
struct tcphdr *, tcp_seq, tcp_seq, int));
void tcp_rmx_rtt __P((struct tcpcb *));
void tcp_setpersist __P((struct tcpcb *));
void tcp_slowtimo __P((void));
struct mbuf *
tcp_template __P((struct tcpcb *));
void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int));
struct tcpcb *
tcp_usrclosed __P((struct tcpcb *));
int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
int tcp_usrreq __P((struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
void tcp_xmit_timer __P((struct tcpcb *, uint32_t));
tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq));
tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t,
tcp_seq));
int syn_cache_add __P((struct sockaddr *, struct sockaddr *,
struct tcphdr *, unsigned int, struct socket *,
struct mbuf *, u_char *, int, struct tcp_opt_info *));
void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *,
struct tcphdr *));
struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *,
struct tcphdr *, unsigned int, unsigned int,
struct socket *so, struct mbuf *));
void syn_cache_init __P((void));
void syn_cache_insert __P((struct syn_cache *, struct tcpcb *));
struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *,
struct syn_cache_head **));
void syn_cache_reset __P((struct sockaddr *, struct sockaddr *,
struct tcphdr *));
int syn_cache_respond __P((struct syn_cache *, struct mbuf *));
void syn_cache_timer __P((void *));
void syn_cache_cleanup __P((struct tcpcb *));
int tcp_newreno __P((struct tcpcb *, struct tcphdr *));
#endif
#endif /* _NETINET_TCP_VAR_H_ */