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openbsd-src/sys/netinet/tcp_var.h

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/* $OpenBSD: tcp_var.h,v 1.56 2004/01/29 11:55:28 markus Exp $ */
/* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */
/*
* Copyright (c) 1982, 1986, 1993, 1994
* 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. 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 8.3 (Berkeley) 4/10/94
*/
#ifndef _NETINET_TCP_VAR_H_
#define _NETINET_TCP_VAR_H_
struct sackblk {
tcp_seq start; /* start seq no. of sack block */
tcp_seq end; /* end seq no. */
};
struct sackhole {
tcp_seq start; /* start seq no. of hole */
tcp_seq end; /* end seq no. */
int dups; /* number of dup(s)acks for this hole */
tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
struct sackhole *next; /* next in list */
};
/*
* Kernel variables for tcp.
*/
/*
* Tcp control block, one per tcp; fields:
*/
struct tcpcb {
struct ipqehead segq; /* sequencing queue */
struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */
short t_state; /* state of this connection */
short t_rxtshift; /* log(2) of rexmt exp. backoff */
short t_rxtcur; /* current retransmit value */
short t_dupacks; /* consecutive dup acks recd */
u_short t_maxseg; /* maximum segment size */
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_SENTFIN 0x0010 /* have sent FIN */
#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_SIGNATURE 0x0400 /* require TCP MD5 signature */
#ifdef TCP_ECN
#define TF_ECN_PERMIT 0x00008000 /* other side said I could ECN */
#define TF_RCVD_CE 0x00010000 /* send ECE in subsequent segs */
#define TF_SEND_CWR 0x00020000 /* send CWR in next seg */
#define TF_DISABLE_ECN 0x00040000 /* disable ECN for this connection */
#endif
#define TF_DEAD 0x00080000 /* dead and to-be-released */
struct mbuf *t_template; /* skeletal packet for transmit */
struct inpcb *t_inpcb; /* back pointer to internet pcb */
struct timeout t_delack_to; /* delayed ACK callback */
/*
* 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 */
#if 1 /*def TCP_SACK*/
int sack_disable; /* disable SACK for this connection */
int snd_numholes; /* number of holes seen by sender */
struct sackhole *snd_holes; /* linked list of holes (sorted) */
#if 1 /*defined(TCP_SACK) && defined(TCP_FACK)*/
tcp_seq snd_fack; /* for FACK congestion control */
u_long snd_awnd; /* snd_nxt - snd_fack + */
/* retransmitted data */
int retran_data; /* amount of outstanding retx. data */
#endif /* TCP_FACK */
#endif /* TCP_SACK */
#if 1 /*defined(TCP_SACK) || defined(TCP_ECN)*/
tcp_seq snd_last; /* for use in fast recovery */
#endif
/* 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 */
#if 1 /*def TCP_SACK*/
tcp_seq rcv_laststart; /* start of last segment recd. */
tcp_seq rcv_lastend; /* end of ... */
tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
int rcv_numsacks; /* # distinct sack blks present */
struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
#endif
/*
* 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
*/
u_short t_maxopd; /* mss plus options */
u_short t_peermss; /* peer's maximum segment size */
/*
* 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 */
short t_srtt; /* smoothed round-trip time */
short t_rttvar; /* variance in round-trip time */
u_short 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 */
tcp_seq last_ack_sent;
/* pointer for syn cache entries*/
LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
/* TUBA stuff */
caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */
int pf;
};
#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
#ifdef _KERNEL
extern int tcp_delack_ticks;
void tcp_delack(void *);
#define TCP_INIT_DELACK(tp) \
timeout_set(&(tp)->t_delack_to, tcp_delack, tp)
#define TCP_RESTART_DELACK(tp) \
timeout_add(&(tp)->t_delack_to, tcp_delack_ticks)
#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; \
timeout_del(&(tp)->t_delack_to); \
} \
} while (/*CONSTCOND*/0)
#endif /* _KERNEL */
/*
* 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;
};
#ifdef _KERNEL
/*
* 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 timeout 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 */
#if 0
u_int32_t sc_timebase; /* our local timebase */
#endif
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 */
#define SCF_DEAD 0x0004 /* this entry to be released */
#define SCF_SACK_PERMIT 0x0008 /* permit sack */
#define SCF_ECN_PERMIT 0x0010 /* permit ecn */
#define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */
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 */
};
#endif /* _KERNEL */
/*
* 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_SCALE 8 /* multiplier for srtt; 3 bits frac. */
#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
#define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */
#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 TCP_RTTVAR_SCALE
* is the same as the multiplier for rttvar.
*/
#define TCP_REXMTVAL(tp) \
((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
/*
* TCP statistics.
* Many of these should be kept per connection,
* but that's inconvenient at the moment.
*/
struct tcpstat {
u_int32_t tcps_connattempt; /* connections initiated */
u_int32_t tcps_accepts; /* connections accepted */
u_int32_t tcps_connects; /* connections established */
u_int32_t tcps_drops; /* connections dropped */
u_int32_t tcps_conndrops; /* embryonic connections dropped */
u_int32_t tcps_closed; /* conn. closed (includes drops) */
u_int32_t tcps_segstimed; /* segs where we tried to get rtt */
u_int32_t tcps_rttupdated; /* times we succeeded */
u_int32_t tcps_delack; /* delayed acks sent */
u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
u_int32_t tcps_rexmttimeo; /* retransmit timeouts */
u_int32_t tcps_persisttimeo; /* persist timeouts */
u_int32_t tcps_persistdrop; /* connections dropped in persist */
u_int32_t tcps_keeptimeo; /* keepalive timeouts */
u_int32_t tcps_keepprobe; /* keepalive probes sent */
u_int32_t tcps_keepdrops; /* connections dropped in keepalive */
u_int32_t tcps_sndtotal; /* total packets sent */
u_int32_t tcps_sndpack; /* data packets sent */
u_int64_t tcps_sndbyte; /* data bytes sent */
u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */
u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
u_int64_t tcps_sndrexmitfast; /* Fast retransmits */
u_int32_t tcps_sndacks; /* ack-only packets sent */
u_int32_t tcps_sndprobe; /* window probes sent */
u_int32_t tcps_sndurg; /* packets sent with URG only */
u_int32_t tcps_sndwinup; /* window update-only packets sent */
u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
u_int32_t tcps_rcvtotal; /* total packets received */
u_int32_t tcps_rcvpack; /* packets received in sequence */
u_int64_t tcps_rcvbyte; /* bytes received in sequence */
u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */
u_int32_t tcps_rcvbadoff; /* packets received with bad offset */
u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */
u_int32_t tcps_rcvshort; /* packets received too short */
u_int32_t tcps_rcvduppack; /* duplicate-only packets received */
u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */
u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
u_int32_t tcps_rcvoopack; /* out-of-order packets received */
u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */
u_int32_t tcps_rcvpackafterwin; /* packets with data after window */
u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */
u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */
u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */
u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
u_int32_t tcps_rcvackpack; /* rcvd ack packets */
u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
u_int32_t tcps_rcvwinupd; /* rcvd window update packets */
u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */
u_int32_t tcps_predack; /* times hdr predict ok for acks */
u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */
u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */
u_int32_t tcps_noport; /* no socket on port */
u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */
u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */
u_int32_t tcps_inhwcsum; /* input hardware-checksummed packets */
u_int32_t tcps_outhwcsum; /* output hardware-checksummed packets */
/* ECN stats */
u_int32_t tcps_ecn_accepts; /* ecn connections accepted */
u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */
u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */
u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */
u_int32_t tcps_ecn_sndect; /* # of cwr sent */
u_int32_t tcps_ecn_sndece; /* # of ece sent */
u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */
u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */
u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */
u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */
/* These statistics deal with the SYN cache. */
u_int64_t tcps_sc_added; /* # of entries added */
u_int64_t tcps_sc_completed; /* # of connections completed */
u_int64_t tcps_sc_timed_out; /* # of entries timed out */
u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */
u_int64_t tcps_sc_reset; /* # dropped due to RST */
u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */
u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
u_int64_t tcps_sc_collisions; /* # of hash collisions */
u_int64_t tcps_sc_retransmitted;/* # of retransmissions */
};
/*
* Names for TCP sysctl objects.
*/
#define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
#define TCPCTL_RECVSPACE 7 /* receive buffer space */
#define TCPCTL_SENDSPACE 8 /* send buffer space */
#define TCPCTL_IDENT 9 /* get connection owner */
#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
#define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
#define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */
#define TCPCTL_ECN 14 /* RFC3168 ECN */
#define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */
#define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */
#define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */
#define TCPCTL_MAXID 18
#define TCPCTL_NAMES { \
{ 0, 0 }, \
{ "rfc1323", CTLTYPE_INT }, \
{ "keepinittime", CTLTYPE_INT }, \
{ "keepidle", CTLTYPE_INT }, \
{ "keepintvl", CTLTYPE_INT }, \
{ "slowhz", CTLTYPE_INT }, \
{ "baddynamic", CTLTYPE_STRUCT }, \
{ "recvspace", CTLTYPE_INT }, \
{ "sendspace", CTLTYPE_INT }, \
{ "ident", CTLTYPE_STRUCT }, \
{ "sack", CTLTYPE_INT }, \
{ "mssdflt", CTLTYPE_INT }, \
{ "rstppslimit", CTLTYPE_INT }, \
{ "ackonpush", CTLTYPE_INT }, \
{ "ecn", CTLTYPE_INT }, \
{ "syncachelimit", CTLTYPE_INT }, \
{ "synbucketlimit", CTLTYPE_INT }, \
{ "rfc3390", CTLTYPE_INT }, \
}
struct tcp_ident_mapping {
struct sockaddr_storage faddr, laddr;
int euid, ruid;
};
#ifdef _KERNEL
extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
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_mssdflt; /* default maximum segment size */
extern int tcp_ack_on_push; /* ACK immediately on PUSH */
#ifdef TCP_SACK
extern int tcp_do_sack; /* SACK enabled/disabled */
extern struct pool sackhl_pool;
#endif
extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */
extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */
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_syn_cache_size;
extern struct syn_cache_head tcp_syn_cache[];
extern u_long syn_cache_count;
int tcp_attach(struct socket *);
void tcp_canceltimers(struct tcpcb *);
struct tcpcb *
tcp_close(struct tcpcb *);
#if defined(INET6) && !defined(TCP6)
void tcp6_ctlinput(int, struct sockaddr *, void *);
#endif
void *tcp_ctlinput(int, struct sockaddr *, void *);
int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **);
struct tcpcb *
tcp_disconnect(struct tcpcb *);
struct tcpcb *
tcp_drop(struct tcpcb *, int);
int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *,
struct mbuf *, int, struct tcp_opt_info *);
void tcp_drain(void);
void tcp_init(void);
#if defined(INET6) && !defined(TCP6)
int tcp6_input(struct mbuf **, int *, int);
#endif
void tcp_input(struct mbuf *, ...);
int tcp_mss(struct tcpcb *, int);
void tcp_mss_update(struct tcpcb *);
void tcp_mtudisc(struct inpcb *, int);
void tcp_mtudisc_increase(struct inpcb *, int);
#ifdef INET6
void tcp6_mtudisc(struct inpcb *, int);
void tcp6_mtudisc_callback(struct in6_addr *);
#endif
struct tcpcb *
tcp_newtcpcb(struct inpcb *);
void tcp_notify(struct inpcb *, int);
int tcp_output(struct tcpcb *);
void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int);
void tcp_quench(struct inpcb *, int);
int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *);
void tcp_rscale(struct tcpcb *, u_long);
void tcp_respond(struct tcpcb *, caddr_t, struct mbuf *, tcp_seq,
tcp_seq, int);
void tcp_setpersist(struct tcpcb *);
void tcp_slowtimo(void);
struct mbuf *
tcp_template(struct tcpcb *);
void tcp_trace(int, int, struct tcpcb *, caddr_t, int, int);
struct tcpcb *
tcp_usrclosed(struct tcpcb *);
int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
#if defined(INET6) && !defined(TCP6)
int tcp6_usrreq(struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
#endif
int tcp_usrreq(struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *);
void tcp_xmit_timer(struct tcpcb *, int);
void tcpdropoldhalfopen(struct tcpcb *, u_int16_t);
#ifdef TCP_SACK
int tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int);
void tcp_update_sack_list(struct tcpcb *tp);
void tcp_del_sackholes(struct tcpcb *, struct tcphdr *);
void tcp_clean_sackreport(struct tcpcb *tp);
void tcp_sack_adjust(struct tcpcb *tp);
struct sackhole *
tcp_sack_output(struct tcpcb *tp);
int tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
#ifdef DEBUG
void tcp_print_holes(struct tcpcb *tp);
#endif
#endif /* TCP_SACK */
#if defined(TCP_SACK)
int tcp_newreno(struct tcpcb *, struct tcphdr *);
u_long tcp_seq_subtract(u_long, u_long );
#endif /* TCP_SACK */
#ifdef TCP_SIGNATURE
int tcp_signature_apply(caddr_t, caddr_t, unsigned int);
#endif /* TCP_SIGNATURE */
void tcp_rndiss_init(void);
tcp_seq tcp_rndiss_next(void);
u_int16_t
tcp_rndiss_encrypt(u_int16_t);
int syn_cache_add(struct sockaddr *, struct sockaddr *,
struct tcphdr *, unsigned int, struct socket *,
struct mbuf *, u_char *, int, struct tcp_opt_info *);
void syn_cache_unreach(struct sockaddr *, struct sockaddr *,
struct tcphdr *);
struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *,
struct tcphdr *, unsigned int, unsigned int,
struct socket *so, struct mbuf *);
void syn_cache_init(void);
void syn_cache_insert(struct syn_cache *, struct tcpcb *);
struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *,
struct syn_cache_head **);
void syn_cache_reset(struct sockaddr *, struct sockaddr *,
struct tcphdr *);
int syn_cache_respond(struct syn_cache *, struct mbuf *);
void syn_cache_timer(void *);
void syn_cache_cleanup(struct tcpcb *);
#endif /* _KERNEL */
#endif /* _NETINET_TCP_VAR_H_ */
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