tcp_var.h revision 196039
165557Sjasone/*- 265557Sjasone * Copyright (c) 1982, 1986, 1993, 1994, 1995 365557Sjasone * The Regents of the University of California. All rights reserved. 465557Sjasone * 565557Sjasone * Redistribution and use in source and binary forms, with or without 665557Sjasone * modification, are permitted provided that the following conditions 765557Sjasone * are met: 865557Sjasone * 1. Redistributions of source code must retain the above copyright 965557Sjasone * notice, this list of conditions and the following disclaimer. 1065557Sjasone * 2. Redistributions in binary form must reproduce the above copyright 1165557Sjasone * notice, this list of conditions and the following disclaimer in the 1265557Sjasone * documentation and/or other materials provided with the distribution. 1365557Sjasone * 4. Neither the name of the University nor the names of its contributors 1465557Sjasone * may be used to endorse or promote products derived from this software 1565557Sjasone * without specific prior written permission. 1665557Sjasone * 1765557Sjasone * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1865557Sjasone * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1965557Sjasone * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2065557Sjasone * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2165557Sjasone * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2265557Sjasone * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2365557Sjasone * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2465557Sjasone * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2565557Sjasone * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2665557Sjasone * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2765557Sjasone * SUCH DAMAGE. 2865557Sjasone * 2967352Sjhb * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 3065557Sjasone * $FreeBSD: head/sys/netinet/tcp_var.h 196039 2009-08-02 19:43:32Z rwatson $ 3165557Sjasone */ 3265557Sjasone 3365557Sjasone#ifndef _NETINET_TCP_VAR_H_ 3465557Sjasone#define _NETINET_TCP_VAR_H_ 3565557Sjasone 3665557Sjasone#include <netinet/tcp.h> 3765557Sjasone 3865557Sjasone#ifdef _KERNEL 3965557Sjasone#include <net/vnet.h> 4065557Sjasone 4165557Sjasone/* 4265557Sjasone * Kernel variables for tcp. 4365557Sjasone */ 4465557SjasoneVNET_DECLARE(int, tcp_do_rfc1323); 4565557SjasoneVNET_DECLARE(int, tcp_reass_qsize); 4665557SjasoneVNET_DECLARE(struct uma_zone *, tcp_reass_zone); 4765557Sjasone#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 4865557Sjasone#define V_tcp_reass_qsize VNET(tcp_reass_qsize) 4965557Sjasone#define V_tcp_reass_zone VNET(tcp_reass_zone) 5065557Sjasone 5165557Sjasone#endif /* _KERNEL */ 5265557Sjasone 5368790Sjhb/* TCP segment queue entry */ 5467676Sjhbstruct tseg_qent { 5567676Sjhb LIST_ENTRY(tseg_qent) tqe_q; 5669215Salfred int tqe_len; /* TCP segment data length */ 5769215Salfred struct tcphdr *tqe_th; /* a pointer to tcp header */ 5869215Salfred struct mbuf *tqe_m; /* mbuf contains packet */ 5969215Salfred}; 6069215SalfredLIST_HEAD(tsegqe_head, tseg_qent); 6169215Salfred 6265557Sjasonestruct sackblk { 6367352Sjhb tcp_seq start; /* start seq no. of sack block */ 6467352Sjhb tcp_seq end; /* end seq no. */ 6567352Sjhb}; 6665557Sjasone 6767676Sjhbstruct sackhole { 6865557Sjasone tcp_seq start; /* start seq no. of hole */ 6967352Sjhb tcp_seq end; /* end seq no. */ 7065557Sjasone tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 7165557Sjasone TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 7267352Sjhb}; 7367352Sjhb 7467352Sjhbstruct sackhint { 7565557Sjasone struct sackhole *nexthole; 7667352Sjhb int sack_bytes_rexmit; 7768790Sjhb 7868790Sjhb int ispare; /* explicit pad for 64bit alignment */ 7967352Sjhb uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 8067352Sjhb}; 8167352Sjhb 8267352Sjhbstruct tcptemp { 8365557Sjasone u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 8465557Sjasone struct tcphdr tt_t; 8567352Sjhb}; 8667352Sjhb 8771352Sjasone#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 8871352Sjasone 8971352Sjasone/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 9071352Sjasone#ifdef INET6 9171352Sjasone#define ND6_HINT(tp) \ 9271352Sjasonedo { \ 9371352Sjasone if ((tp) && (tp)->t_inpcb && \ 9471352Sjasone ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 9571352Sjasone nd6_nud_hint(NULL, NULL, 0); \ 9671560Sjhb} while (0) 9771560Sjhb#else 9871560Sjhb#define ND6_HINT(tp) 9971560Sjhb#endif 10071352Sjasone 10171352Sjasone/* 10271352Sjasone * Tcp control block, one per tcp; fields: 10371352Sjasone * Organized for 16 byte cacheline efficiency. 10471352Sjasone */ 10571352Sjasonestruct tcpcb { 10671352Sjasone struct tsegqe_head t_segq; /* segment reassembly queue */ 10771352Sjasone void *t_pspare[2]; /* new reassembly queue */ 10871352Sjasone int t_segqlen; /* segment reassembly queue length */ 10971352Sjasone int t_dupacks; /* consecutive dup acks recd */ 11071352Sjasone 11171352Sjasone struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 11271352Sjasone 11371352Sjasone struct inpcb *t_inpcb; /* back pointer to internet pcb */ 11471352Sjasone int t_state; /* state of this connection */ 11571352Sjasone u_int t_flags; 11671352Sjasone 11771352Sjasone struct vnet *t_vnet; /* back pointer to parent vnet */ 11871352Sjasone 11971352Sjasone tcp_seq snd_una; /* send unacknowledged */ 12071352Sjasone tcp_seq snd_max; /* highest sequence number sent; 12171352Sjasone * used to recognize retransmits 12271352Sjasone */ 12371352Sjasone tcp_seq snd_nxt; /* send next */ 12471352Sjasone tcp_seq snd_up; /* send urgent pointer */ 12571352Sjasone 12671352Sjasone tcp_seq snd_wl1; /* window update seg seq number */ 12771352Sjasone tcp_seq snd_wl2; /* window update seg ack number */ 12871352Sjasone tcp_seq iss; /* initial send sequence number */ 12971352Sjasone tcp_seq irs; /* initial receive sequence number */ 13071352Sjasone 13171352Sjasone tcp_seq rcv_nxt; /* receive next */ 13271352Sjasone tcp_seq rcv_adv; /* advertised window */ 13371352Sjasone u_long rcv_wnd; /* receive window */ 13471352Sjasone tcp_seq rcv_up; /* receive urgent pointer */ 13571352Sjasone 13671352Sjasone u_long snd_wnd; /* send window */ 13771352Sjasone u_long snd_cwnd; /* congestion-controlled window */ 13871352Sjasone u_long snd_bwnd; /* bandwidth-controlled window */ 13971352Sjasone u_long snd_ssthresh; /* snd_cwnd size threshold for 14071352Sjasone * for slow start exponential to 14171352Sjasone * linear switch 14271352Sjasone */ 14371352Sjasone u_long snd_bandwidth; /* calculated bandwidth or 0 */ 14471352Sjasone tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 14571352Sjasone 14671352Sjasone u_int t_maxopd; /* mss plus options */ 14771352Sjasone 14871352Sjasone u_int t_rcvtime; /* inactivity time */ 14971352Sjasone u_int t_starttime; /* time connection was established */ 15071352Sjasone u_int t_rtttime; /* RTT measurement start time */ 15171352Sjasone tcp_seq t_rtseq; /* sequence number being timed */ 15271352Sjasone 15371352Sjasone u_int t_bw_rtttime; /* used for bandwidth calculation */ 15471352Sjasone tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 15571352Sjasone 15671352Sjasone int t_rxtcur; /* current retransmit value (ticks) */ 15771352Sjasone u_int t_maxseg; /* maximum segment size */ 15871352Sjasone int t_srtt; /* smoothed round-trip time */ 15971352Sjasone int t_rttvar; /* variance in round-trip time */ 16071352Sjasone 16171352Sjasone int t_rxtshift; /* log(2) of rexmt exp. backoff */ 16271352Sjasone u_int t_rttmin; /* minimum rtt allowed */ 16371352Sjasone u_int t_rttbest; /* best rtt we've seen */ 16471352Sjasone u_long t_rttupdated; /* number of times rtt sampled */ 16571352Sjasone u_long max_sndwnd; /* largest window peer has offered */ 16671352Sjasone 16771352Sjasone int t_softerror; /* possible error not yet reported */ 16871352Sjasone/* out-of-band data */ 16971352Sjasone char t_oobflags; /* have some */ 17071352Sjasone char t_iobc; /* input character */ 17171352Sjasone/* RFC 1323 variables */ 17271352Sjasone u_char snd_scale; /* window scaling for send window */ 17371352Sjasone u_char rcv_scale; /* window scaling for recv window */ 17471352Sjasone u_char request_r_scale; /* pending window scaling */ 17571352Sjasone u_int32_t ts_recent; /* timestamp echo data */ 17671352Sjasone u_int ts_recent_age; /* when last updated */ 17771352Sjasone u_int32_t ts_offset; /* our timestamp offset */ 17871352Sjasone 17971352Sjasone tcp_seq last_ack_sent; 18071352Sjasone/* experimental */ 18171352Sjasone u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 18271352Sjasone u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 18371352Sjasone tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 18471352Sjasone u_int t_badrxtwin; /* window for retransmit recovery */ 18571352Sjasone u_char snd_limited; /* segments limited transmitted */ 18671352Sjasone/* SACK related state */ 18771352Sjasone int snd_numholes; /* number of holes seen by sender */ 18871352Sjasone TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 18971352Sjasone /* SACK scoreboard (sorted) */ 19071352Sjasone tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 19171352Sjasone int rcv_numsacks; /* # distinct sack blks present */ 19271352Sjasone struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 19371352Sjasone tcp_seq sack_newdata; /* New data xmitted in this recovery 19471352Sjasone episode starts at this seq number */ 19571352Sjasone struct sackhint sackhint; /* SACK scoreboard hint */ 19671352Sjasone int t_rttlow; /* smallest observerved RTT */ 19771352Sjasone u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 19871352Sjasone int rfbuf_cnt; /* recv buffer autoscaling byte count */ 19971352Sjasone struct toe_usrreqs *t_tu; /* offload operations vector */ 20071352Sjasone void *t_toe; /* TOE pcb pointer */ 20171352Sjasone int t_bytes_acked; /* # bytes acked during current RTT */ 20271352Sjasone 20371352Sjasone int t_ispare; /* explicit pad for 64bit alignment */ 20471352Sjasone void *t_pspare2[6]; /* 2 CC / 4 TBD */ 20571352Sjasone uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */ 20671352Sjasone}; 20771352Sjasone 20871352Sjasone/* 20971352Sjasone * Flags and utility macros for the t_flags field. 21071352Sjasone */ 21171352Sjasone#define TF_ACKNOW 0x000001 /* ack peer immediately */ 21271352Sjasone#define TF_DELACK 0x000002 /* ack, but try to delay it */ 21371352Sjasone#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 21471352Sjasone#define TF_NOOPT 0x000008 /* don't use tcp options */ 21571352Sjasone#define TF_SENTFIN 0x000010 /* have sent FIN */ 21667352Sjhb#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 21771560Sjhb#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 21871320Sjasone#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 21971320Sjasone#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 22071320Sjasone#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 22171320Sjasone#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 22271320Sjasone#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 22369429Sjhb#define TF_NOPUSH 0x001000 /* don't push */ 22471352Sjasone#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 22571352Sjasone#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 22671352Sjasone#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 22771352Sjasone#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 22871352Sjasone#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 22971352Sjasone#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 23071352Sjasone#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 23171352Sjasone#define TF_FORCEDATA 0x800000 /* force out a byte */ 23269429Sjhb#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 23367352Sjhb#define TF_TOE 0x2000000 /* this connection is offloaded */ 23471560Sjhb#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 23571560Sjhb#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 23671560Sjhb#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 23771560Sjhb 23871560Sjhb#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 23971560Sjhb#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 24071560Sjhb#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 24171560Sjhb 24271560Sjhb/* 24371560Sjhb * Flags for the t_oobflags field. 24471560Sjhb */ 24567352Sjhb#define TCPOOB_HAVEDATA 0x01 24667352Sjhb#define TCPOOB_HADDATA 0x02 24767352Sjhb 24871352Sjasone#ifdef TCP_SIGNATURE 24971352Sjasone/* 25071352Sjasone * Defines which are needed by the xform_tcp module and tcp_[in|out]put 25167352Sjhb * for SADB verification and lookup. 25267352Sjhb */ 25367352Sjhb#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 25467352Sjhb#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 25567352Sjhb#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 25667352Sjhb/* 25767352Sjhb * Only a single SA per host may be specified at this time. An SPI is 25867352Sjhb * needed in order for the KEY_ALLOCSA() lookup to work. 25967352Sjhb */ 26067352Sjhb#define TCP_SIG_SPI 0x1000 26167352Sjhb#endif /* TCP_SIGNATURE */ 26267352Sjhb 26367352Sjhb/* 26467352Sjhb * Structure to hold TCP options that are only used during segment 26569376Sjhb * processing (in tcp_input), but not held in the tcpcb. 26667352Sjhb * It's basically used to reduce the number of parameters 26767352Sjhb * to tcp_dooptions and tcp_addoptions. 26867352Sjhb * The binary order of the to_flags is relevant for packing of the 26967352Sjhb * options in tcp_addoptions. 27067352Sjhb */ 27167352Sjhbstruct tcpopt { 27267352Sjhb u_int64_t to_flags; /* which options are present */ 27367352Sjhb#define TOF_MSS 0x0001 /* maximum segment size */ 27467352Sjhb#define TOF_SCALE 0x0002 /* window scaling */ 27567352Sjhb#define TOF_SACKPERM 0x0004 /* SACK permitted */ 27667352Sjhb#define TOF_TS 0x0010 /* timestamp */ 27767352Sjhb#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 27867352Sjhb#define TOF_SACK 0x0080 /* Peer sent SACK option */ 27967352Sjhb#define TOF_MAXOPT 0x0100 28067352Sjhb u_int32_t to_tsval; /* new timestamp */ 28169376Sjhb u_int32_t to_tsecr; /* reflected timestamp */ 28267352Sjhb u_char *to_sacks; /* pointer to the first SACK blocks */ 28367352Sjhb u_char *to_signature; /* pointer to the TCP-MD5 signature */ 28469376Sjhb u_int16_t to_mss; /* maximum segment size */ 28567352Sjhb u_int8_t to_wscale; /* window scaling */ 28669376Sjhb u_int8_t to_nsacks; /* number of SACK blocks */ 28769376Sjhb}; 28869376Sjhb 28969376Sjhb/* 29069376Sjhb * Flags for tcp_dooptions. 29167352Sjhb */ 29267352Sjhb#define TO_SYN 0x01 /* parse SYN-only options */ 29369376Sjhb 29469376Sjhbstruct hc_metrics_lite { /* must stay in sync with hc_metrics */ 29569376Sjhb u_long rmx_mtu; /* MTU for this path */ 29669376Sjhb u_long rmx_ssthresh; /* outbound gateway buffer limit */ 29769376Sjhb u_long rmx_rtt; /* estimated round trip time */ 29869376Sjhb u_long rmx_rttvar; /* estimated rtt variance */ 29967352Sjhb u_long rmx_bandwidth; /* estimated bandwidth */ 30067352Sjhb u_long rmx_cwnd; /* congestion window */ 30167352Sjhb u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 30269376Sjhb u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 30367352Sjhb}; 30469376Sjhb 30569376Sjhb#ifndef _NETINET_IN_PCB_H_ 30669376Sjhbstruct in_conninfo; 30769376Sjhb#endif /* _NETINET_IN_PCB_H_ */ 30869376Sjhb 30969376Sjhbstruct tcptw { 31069376Sjhb struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 31169376Sjhb tcp_seq snd_nxt; 31269376Sjhb tcp_seq rcv_nxt; 31367352Sjhb tcp_seq iss; 31467352Sjhb tcp_seq irs; 31567352Sjhb u_short last_win; /* cached window value */ 31667352Sjhb u_short tw_so_options; /* copy of so_options */ 31769376Sjhb struct ucred *tw_cred; /* user credentials */ 31869376Sjhb u_int32_t t_recent; 31967352Sjhb u_int32_t ts_offset; /* our timestamp offset */ 32067352Sjhb u_int t_starttime; 32167352Sjhb int tw_time; 32267352Sjhb TAILQ_ENTRY(tcptw) tw_2msl; 32367352Sjhb}; 32467352Sjhb 32567352Sjhb#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 32669376Sjhb#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 32767352Sjhb#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 32869376Sjhb 32969376Sjhb/* 33069376Sjhb * The smoothed round-trip time and estimated variance 33169376Sjhb * are stored as fixed point numbers scaled by the values below. 33267352Sjhb * For convenience, these scales are also used in smoothing the average 33367352Sjhb * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 33467352Sjhb * With these scales, srtt has 3 bits to the right of the binary point, 33567352Sjhb * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 33667352Sjhb * binary point, and is smoothed with an ALPHA of 0.75. 33767352Sjhb */ 33867352Sjhb#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 33967352Sjhb#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 34067352Sjhb#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 34167352Sjhb#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 34267352Sjhb#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 34367352Sjhb 34467352Sjhb/* 34569376Sjhb * The initial retransmission should happen at rtt + 4 * rttvar. 34669376Sjhb * Because of the way we do the smoothing, srtt and rttvar 34769376Sjhb * will each average +1/2 tick of bias. When we compute 34869376Sjhb * the retransmit timer, we want 1/2 tick of rounding and 34969376Sjhb * 1 extra tick because of +-1/2 tick uncertainty in the 35069376Sjhb * firing of the timer. The bias will give us exactly the 35169376Sjhb * 1.5 tick we need. But, because the bias is 35267352Sjhb * statistical, we have to test that we don't drop below 35369376Sjhb * the minimum feasible timer (which is 2 ticks). 35467352Sjhb * This version of the macro adapted from a paper by Lawrence 35567352Sjhb * Brakmo and Larry Peterson which outlines a problem caused 35667352Sjhb * by insufficient precision in the original implementation, 35767352Sjhb * which results in inappropriately large RTO values for very 35869376Sjhb * fast networks. 35969376Sjhb */ 36069376Sjhb#define TCP_REXMTVAL(tp) \ 36169376Sjhb max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 36269376Sjhb + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 36367352Sjhb 36467352Sjhb/* 36567352Sjhb * TCP statistics. 36667352Sjhb * Many of these should be kept per connection, 36767352Sjhb * but that's inconvenient at the moment. 36867352Sjhb */ 36967352Sjhbstruct tcpstat { 37069376Sjhb u_long tcps_connattempt; /* connections initiated */ 37169376Sjhb u_long tcps_accepts; /* connections accepted */ 37267352Sjhb u_long tcps_connects; /* connections established */ 37371560Sjhb u_long tcps_drops; /* connections dropped */ 37467352Sjhb u_long tcps_conndrops; /* embryonic connections dropped */ 37567352Sjhb u_long tcps_minmssdrops; /* average minmss too low drops */ 37667352Sjhb u_long tcps_closed; /* conn. closed (includes drops) */ 37767352Sjhb u_long tcps_segstimed; /* segs where we tried to get rtt */ 37871352Sjasone u_long tcps_rttupdated; /* times we succeeded */ 37971352Sjasone u_long tcps_delack; /* delayed acks sent */ 38071352Sjasone u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 38171352Sjasone u_long tcps_rexmttimeo; /* retransmit timeouts */ 38271352Sjasone u_long tcps_persisttimeo; /* persist timeouts */ 38371352Sjasone u_long tcps_keeptimeo; /* keepalive timeouts */ 38467352Sjhb u_long tcps_keepprobe; /* keepalive probes sent */ 38571352Sjasone u_long tcps_keepdrops; /* connections dropped in keepalive */ 38671352Sjasone 38771352Sjasone u_long tcps_sndtotal; /* total packets sent */ 38871352Sjasone u_long tcps_sndpack; /* data packets sent */ 38971352Sjasone u_long tcps_sndbyte; /* data bytes sent */ 39071352Sjasone u_long tcps_sndrexmitpack; /* data packets retransmitted */ 39171352Sjasone u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 39271352Sjasone u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 39371352Sjasone u_long tcps_sndacks; /* ack-only packets sent */ 39471352Sjasone u_long tcps_sndprobe; /* window probes sent */ 39571352Sjasone u_long tcps_sndurg; /* packets sent with URG only */ 39671352Sjasone u_long tcps_sndwinup; /* window update-only packets sent */ 39771352Sjasone u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 39871352Sjasone 39971352Sjasone u_long tcps_rcvtotal; /* total packets received */ 40071352Sjasone u_long tcps_rcvpack; /* packets received in sequence */ 40171352Sjasone u_long tcps_rcvbyte; /* bytes received in sequence */ 40271352Sjasone u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 40371352Sjasone u_long tcps_rcvbadoff; /* packets received with bad offset */ 40471352Sjasone u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 40571352Sjasone u_long tcps_rcvshort; /* packets received too short */ 40671352Sjasone u_long tcps_rcvduppack; /* duplicate-only packets received */ 40771352Sjasone u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 40871352Sjasone u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 40971352Sjasone u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 41071352Sjasone u_long tcps_rcvoopack; /* out-of-order packets received */ 41171352Sjasone u_long tcps_rcvoobyte; /* out-of-order bytes received */ 41271352Sjasone u_long tcps_rcvpackafterwin; /* packets with data after window */ 41371352Sjasone u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 41471352Sjasone u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 41571352Sjasone u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 41671352Sjasone u_long tcps_rcvdupack; /* rcvd duplicate acks */ 41771352Sjasone u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 41871352Sjasone u_long tcps_rcvackpack; /* rcvd ack packets */ 41971352Sjasone u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 42071352Sjasone u_long tcps_rcvwinupd; /* rcvd window update packets */ 42171352Sjasone u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 42271352Sjasone u_long tcps_predack; /* times hdr predict ok for acks */ 42371352Sjasone u_long tcps_preddat; /* times hdr predict ok for data pkts */ 42471352Sjasone u_long tcps_pcbcachemiss; 42571352Sjasone u_long tcps_cachedrtt; /* times cached RTT in route updated */ 42671352Sjasone u_long tcps_cachedrttvar; /* times cached rttvar updated */ 42771352Sjasone u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 42871352Sjasone u_long tcps_usedrtt; /* times RTT initialized from route */ 42971352Sjasone u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 43071352Sjasone u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 43171352Sjasone u_long tcps_persistdrop; /* timeout in persist state */ 43271352Sjasone u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 43371352Sjasone u_long tcps_mturesent; /* resends due to MTU discovery */ 43471352Sjasone u_long tcps_listendrop; /* listen queue overflows */ 43571352Sjasone u_long tcps_badrst; /* ignored RSTs in the window */ 43671352Sjasone 43771352Sjasone u_long tcps_sc_added; /* entry added to syncache */ 43871352Sjasone u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 43971352Sjasone u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 44071352Sjasone u_long tcps_sc_dropped; /* could not reply to packet */ 44171352Sjasone u_long tcps_sc_completed; /* successful extraction of entry */ 44271352Sjasone u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 44371352Sjasone u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 44471352Sjasone u_long tcps_sc_reset; /* RST removed entry from syncache */ 44571352Sjasone u_long tcps_sc_stale; /* timed out or listen socket gone */ 44671352Sjasone u_long tcps_sc_aborted; /* syncache entry aborted */ 44771352Sjasone u_long tcps_sc_badack; /* removed due to bad ACK */ 44871352Sjasone u_long tcps_sc_unreach; /* ICMP unreachable received */ 44971352Sjasone u_long tcps_sc_zonefail; /* zalloc() failed */ 45071352Sjasone u_long tcps_sc_sendcookie; /* SYN cookie sent */ 45171352Sjasone u_long tcps_sc_recvcookie; /* SYN cookie received */ 45271352Sjasone 45371352Sjasone u_long tcps_hc_added; /* entry added to hostcache */ 45471352Sjasone u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 45571352Sjasone 45671352Sjasone u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 45771352Sjasone 45871352Sjasone /* SACK related stats */ 45971352Sjasone u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 46071352Sjasone u_long tcps_sack_rexmits; /* SACK rexmit segments */ 46171352Sjasone u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 46271352Sjasone u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 46371352Sjasone u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 46471352Sjasone u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 46571352Sjasone 46671352Sjasone /* ECN related stats */ 46771352Sjasone u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 46871352Sjasone u_long tcps_ecn_ect0; /* ECN Capable Transport */ 46971352Sjasone u_long tcps_ecn_ect1; /* ECN Capable Transport */ 47071352Sjasone u_long tcps_ecn_shs; /* ECN successful handshakes */ 47171352Sjasone u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 47271352Sjasone 47371352Sjasone u_long _pad[12]; /* 6 UTO, 6 TBD */ 47471352Sjasone}; 47571352Sjasone 47671352Sjasone#ifdef _KERNEL 47771352Sjasone/* 47871352Sjasone * In-kernel consumers can use these accessor macros directly to update 47971352Sjasone * stats. 48071352Sjasone */ 48171352Sjasone#define TCPSTAT_ADD(name, val) V_tcpstat.name += (val) 48271352Sjasone#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 48371352Sjasone 48471352Sjasone/* 48571352Sjasone * Kernel module consumers must use this accessor macro. 48671352Sjasone */ 48771352Sjasonevoid kmod_tcpstat_inc(int statnum); 48871352Sjasone#define KMOD_TCPSTAT_INC(name) \ 48971352Sjasone kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long)) 49071352Sjasone#endif 49171352Sjasone 49271352Sjasone/* 49371352Sjasone * TCB structure exported to user-land via sysctl(3). 49471352Sjasone * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 49571352Sjasone * included. Not all of our clients do. 49671352Sjasone */ 49771352Sjasone#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 49871352Sjasonestruct xtcpcb { 49971352Sjasone size_t xt_len; 50071352Sjasone struct inpcb xt_inp; 50171352Sjasone struct tcpcb xt_tp; 50271352Sjasone struct xsocket xt_socket; 50371352Sjasone u_quad_t xt_alignment_hack; 50471352Sjasone}; 50571352Sjasone#endif 50671352Sjasone 50771352Sjasone/* 50871352Sjasone * Names for TCP sysctl objects 50971352Sjasone */ 51071352Sjasone#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 51171352Sjasone#define TCPCTL_MSSDFLT 3 /* MSS default */ 51271352Sjasone#define TCPCTL_STATS 4 /* statistics (read-only) */ 51371352Sjasone#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 51471352Sjasone#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 51571352Sjasone#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 51667352Sjhb#define TCPCTL_SENDSPACE 8 /* send buffer space */ 51767352Sjhb#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 51867352Sjhb#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 51967352Sjhb#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 52067352Sjhb#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 52167352Sjhb#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 52267352Sjhb#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 52367352Sjhb#define TCPCTL_DROP 15 /* drop tcp connection */ 52467352Sjhb#define TCPCTL_MAXID 16 52567352Sjhb#define TCPCTL_FINWAIT2_TIMEOUT 17 52671228Sbmilekic 52769998Sjhb#define TCPCTL_NAMES { \ 52871560Sjhb { 0, 0 }, \ 52967352Sjhb { "rfc1323", CTLTYPE_INT }, \ 53067352Sjhb { "mssdflt", CTLTYPE_INT }, \ 53169998Sjhb { "stats", CTLTYPE_STRUCT }, \ 53269998Sjhb { "rttdflt", CTLTYPE_INT }, \ 53371560Sjhb { "keepidle", CTLTYPE_INT }, \ 53469998Sjhb { "keepintvl", CTLTYPE_INT }, \ 53569376Sjhb { "sendspace", CTLTYPE_INT }, \ 53669376Sjhb { "recvspace", CTLTYPE_INT }, \ 53769376Sjhb { "keepinit", CTLTYPE_INT }, \ 53869376Sjhb { "pcblist", CTLTYPE_STRUCT }, \ 53969376Sjhb { "delacktime", CTLTYPE_INT }, \ 54069376Sjhb { "v6mssdflt", CTLTYPE_INT }, \ 54169376Sjhb { "maxid", CTLTYPE_INT }, \ 54269376Sjhb} 54369376Sjhb 54469376Sjhb 54569376Sjhb#ifdef _KERNEL 54669376Sjhb#ifdef SYSCTL_DECL 54767352SjhbSYSCTL_DECL(_net_inet_tcp); 54867396SjhbSYSCTL_DECL(_net_inet_tcp_sack); 54967352SjhbMALLOC_DECLARE(M_TCPLOG); 55067352Sjhb#endif 55167352Sjhb 55267352Sjhbextern int tcp_log_in_vain; 55367352Sjhb 55467352SjhbVNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 55567352SjhbVNET_DECLARE(struct inpcbinfo, tcbinfo); 55667352SjhbVNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 55767352SjhbVNET_DECLARE(int, tcp_mssdflt); /* XXX */ 55867352SjhbVNET_DECLARE(int, tcp_minmss); 55967352SjhbVNET_DECLARE(int, tcp_delack_enabled); 56067352SjhbVNET_DECLARE(int, tcp_do_newreno); 56167352SjhbVNET_DECLARE(int, path_mtu_discovery); 56267352SjhbVNET_DECLARE(int, ss_fltsz); 56367352SjhbVNET_DECLARE(int, ss_fltsz_local); 56467352Sjhb 56567352Sjhb#define V_tcb VNET(tcb) 56667352Sjhb#define V_tcbinfo VNET(tcbinfo) 56767352Sjhb#define V_tcpstat VNET(tcpstat) 56867352Sjhb#define V_tcp_mssdflt VNET(tcp_mssdflt) 56967352Sjhb#define V_tcp_minmss VNET(tcp_minmss) 57067352Sjhb#define V_tcp_delack_enabled VNET(tcp_delack_enabled) 57167352Sjhb#define V_tcp_do_newreno VNET(tcp_do_newreno) 57267352Sjhb#define V_path_mtu_discovery VNET(path_mtu_discovery) 57367352Sjhb#define V_ss_fltsz VNET(ss_fltsz) 57467352Sjhb#define V_ss_fltsz_local VNET(ss_fltsz_local) 57567352Sjhb 57667352SjhbVNET_DECLARE(int, blackhole); 57767352SjhbVNET_DECLARE(int, drop_synfin); 57867352SjhbVNET_DECLARE(int, tcp_do_rfc3042); 57967352SjhbVNET_DECLARE(int, tcp_do_rfc3390); 58067352SjhbVNET_DECLARE(int, tcp_insecure_rst); 58167352SjhbVNET_DECLARE(int, tcp_do_autorcvbuf); 58267352SjhbVNET_DECLARE(int, tcp_autorcvbuf_inc); 58367352SjhbVNET_DECLARE(int, tcp_autorcvbuf_max); 58467352SjhbVNET_DECLARE(int, tcp_do_rfc3465); 58567352SjhbVNET_DECLARE(int, tcp_abc_l_var); 58667352Sjhb 58767352Sjhb#define V_blackhole VNET(blackhole) 58867352Sjhb#define V_drop_synfin VNET(drop_synfin) 58967352Sjhb#define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 59067352Sjhb#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 59167352Sjhb#define V_tcp_insecure_rst VNET(tcp_insecure_rst) 59267352Sjhb#define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 59367352Sjhb#define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) 59467352Sjhb#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 59567352Sjhb#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 59667352Sjhb#define V_tcp_abc_l_var VNET(tcp_abc_l_var) 59767352Sjhb 59867352SjhbVNET_DECLARE(int, tcp_do_tso); 59967352SjhbVNET_DECLARE(int, tcp_do_autosndbuf); 60069998SjhbVNET_DECLARE(int, tcp_autosndbuf_inc); 60169998SjhbVNET_DECLARE(int, tcp_autosndbuf_max); 60267352Sjhb 60369998Sjhb#define V_tcp_do_tso VNET(tcp_do_tso) 60467352Sjhb#define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 60567352Sjhb#define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 60667352Sjhb#define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 60767352Sjhb 60867352SjhbVNET_DECLARE(int, nolocaltimewait); 60967352Sjhb 61067352Sjhb#define V_nolocaltimewait VNET(nolocaltimewait) 61167352Sjhb 61267352SjhbVNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 61367352SjhbVNET_DECLARE(int, tcp_sack_maxholes); 61467352SjhbVNET_DECLARE(int, tcp_sack_globalmaxholes); 61567352SjhbVNET_DECLARE(int, tcp_sack_globalholes); 61667352SjhbVNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 61767352SjhbVNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 61867352SjhbVNET_DECLARE(int, tcp_ecn_maxretries); 61967352Sjhb 62067352Sjhb#define V_tcp_do_sack VNET(tcp_do_sack) 62167352Sjhb#define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 62267352Sjhb#define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 62367352Sjhb#define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 62467352Sjhb#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 62567352Sjhb#define V_tcp_do_ecn VNET(tcp_do_ecn) 62667352Sjhb#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 62767352Sjhb 62869369Sjhbint tcp_addoptions(struct tcpopt *, u_char *); 62967352Sjhbstruct tcpcb * 63067352Sjhb tcp_close(struct tcpcb *); 63167352Sjhbvoid tcp_discardcb(struct tcpcb *); 63267352Sjhbvoid tcp_twstart(struct tcpcb *); 63369998Sjhb#if 0 63469998Sjhbint tcp_twrecycleable(struct tcptw *tw); 63571560Sjhb#endif 63669998Sjhbvoid tcp_twclose(struct tcptw *_tw, int _reuse); 63768808Sjhbvoid tcp_ctlinput(int, struct sockaddr *, void *); 63869998Sjhbint tcp_ctloutput(struct socket *, struct sockopt *); 63969998Sjhbstruct tcpcb * 64071560Sjhb tcp_drop(struct tcpcb *, int); 64169998Sjhbvoid tcp_drain(void); 64267352Sjhbvoid tcp_fasttimo(void); 64367352Sjhbvoid tcp_init(void); 64467352Sjhb#ifdef VIMAGE 64567352Sjhbvoid tcp_destroy(void); 64667352Sjhb#endif 64767352Sjhbvoid tcp_fini(void *); 64867352Sjhbchar *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 64967352Sjhb const void *); 65067352Sjhbint tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 65167352Sjhbvoid tcp_reass_init(void); 65267352Sjhbvoid tcp_input(struct mbuf *, int); 65367352Sjhbu_long tcp_maxmtu(struct in_conninfo *, int *); 65467352Sjhbu_long tcp_maxmtu6(struct in_conninfo *, int *); 65569998Sjhbvoid tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); 65669998Sjhbvoid tcp_mss(struct tcpcb *, int); 65767352Sjhbint tcp_mssopt(struct in_conninfo *); 65867352Sjhbstruct inpcb * 65967352Sjhb tcp_drop_syn_sent(struct inpcb *, int); 66067352Sjhbstruct inpcb * 66167352Sjhb tcp_mtudisc(struct inpcb *, int); 66267352Sjhbstruct tcpcb * 66367352Sjhb tcp_newtcpcb(struct inpcb *); 66467352Sjhbint tcp_output(struct tcpcb *); 66567352Sjhbvoid tcp_respond(struct tcpcb *, void *, 66667352Sjhb struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 66767352Sjhbvoid tcp_tw_init(void); 66867352Sjhb#ifdef VIMAGE 66967352Sjhbvoid tcp_tw_destroy(void); 67067352Sjhb#endif 67171560Sjhbvoid tcp_tw_zone_change(void); 67267352Sjhbint tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 67367352Sjhb struct mbuf *, int); 67467352Sjhbint tcp_twrespond(struct tcptw *, int); 67567352Sjhbvoid tcp_setpersist(struct tcpcb *); 67667352Sjhb#ifdef TCP_SIGNATURE 67767352Sjhbint tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 67867352Sjhb#endif 67967352Sjhbvoid tcp_slowtimo(void); 68067352Sjhbstruct tcptemp * 68167352Sjhb tcpip_maketemplate(struct inpcb *); 68267352Sjhbvoid tcpip_fillheaders(struct inpcb *, void *, void *); 68369998Sjhbvoid tcp_timer_activate(struct tcpcb *, int, u_int); 68471560Sjhbint tcp_timer_active(struct tcpcb *, int); 68567352Sjhbvoid tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 68667352Sjhbvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 68767352Sjhb/* 68867352Sjhb * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 68967352Sjhb */ 69067352Sjhbvoid tcp_hc_init(void); 69167352Sjhb#ifdef VIMAGE 69267352Sjhbvoid tcp_hc_destroy(void); 69367352Sjhb#endif 69467352Sjhbvoid tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 69567352Sjhbu_long tcp_hc_getmtu(struct in_conninfo *); 69667352Sjhbvoid tcp_hc_updatemtu(struct in_conninfo *, u_long); 69767352Sjhbvoid tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 69867352Sjhb 69967352Sjhbextern struct pr_usrreqs tcp_usrreqs; 70067352Sjhbextern u_long tcp_sendspace; 70171228Sbmilekicextern u_long tcp_recvspace; 70267352Sjhbtcp_seq tcp_new_isn(struct tcpcb *); 70371228Sbmilekic 70469998Sjhbvoid tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 70571560Sjhbvoid tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 70667352Sjhbvoid tcp_clean_sackreport(struct tcpcb *tp); 70767352Sjhbvoid tcp_sack_adjust(struct tcpcb *tp); 70867352Sjhbstruct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 70969998Sjhbvoid tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 71071560Sjhbvoid tcp_free_sackholes(struct tcpcb *tp); 71167352Sjhbint tcp_newreno(struct tcpcb *, struct tcphdr *); 71267352Sjhbu_long tcp_seq_subtract(u_long, u_long ); 71367352Sjhb 71467352Sjhb#endif /* _KERNEL */ 71567352Sjhb 71667352Sjhb#endif /* _NETINET_TCP_VAR_H_ */ 71767352Sjhb