tcp_var.h revision 44078
11541Srgrimes/* 210937Swollman * Copyright (c) 1982, 1986, 1993, 1994, 1995 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 3310937Swollman * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 3444078Sdfr * $Id: tcp_var.h,v 1.49 1999/01/20 17:32:00 fenner Exp $ 351541Srgrimes */ 361541Srgrimes 372169Spaul#ifndef _NETINET_TCP_VAR_H_ 382169Spaul#define _NETINET_TCP_VAR_H_ 391541Srgrimes/* 401541Srgrimes * Kernel variables for tcp. 411541Srgrimes */ 421541Srgrimes 431541Srgrimes/* 441541Srgrimes * Tcp control block, one per tcp; fields: 4532821Sdg * Organized for 16 byte cacheline efficiency. 461541Srgrimes */ 471541Srgrimesstruct tcpcb { 4838513Sdfr struct mbuf *t_segq; 4932821Sdg int t_dupacks; /* consecutive dup acks recd */ 5032821Sdg struct tcpiphdr *t_template; /* skeletal packet for transmit */ 5132821Sdg 5232821Sdg int t_timer[TCPT_NTIMERS]; /* tcp timers */ 5332821Sdg 5432821Sdg struct inpcb *t_inpcb; /* back pointer to internet pcb */ 5511187Swollman int t_state; /* state of this connection */ 5611187Swollman u_int t_flags; 5742902Sfenner#define TF_ACKNOW 0x00001 /* ack peer immediately */ 5842902Sfenner#define TF_DELACK 0x00002 /* ack, but try to delay it */ 5942902Sfenner#define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ 6042902Sfenner#define TF_NOOPT 0x00008 /* don't use tcp options */ 6142902Sfenner#define TF_SENTFIN 0x00010 /* have sent FIN */ 6242902Sfenner#define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ 6342902Sfenner#define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ 6442902Sfenner#define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ 6542902Sfenner#define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ 6642902Sfenner#define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ 6742902Sfenner#define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */ 6842902Sfenner#define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ 6942902Sfenner#define TF_NOPUSH 0x01000 /* don't push */ 7042902Sfenner#define TF_REQ_CC 0x02000 /* have/will request CC */ 7142902Sfenner#define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ 7242902Sfenner#define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */ 7342902Sfenner#define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ 7432821Sdg int t_force; /* 1 if forcing out a byte */ 751541Srgrimes 761541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 7732821Sdg tcp_seq snd_max; /* highest sequence number sent; 7832821Sdg * used to recognize retransmits 7932821Sdg */ 801541Srgrimes tcp_seq snd_nxt; /* send next */ 811541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 8232821Sdg 831541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 841541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 851541Srgrimes tcp_seq iss; /* initial send sequence number */ 8632821Sdg tcp_seq irs; /* initial receive sequence number */ 8732821Sdg 8832821Sdg tcp_seq rcv_nxt; /* receive next */ 8932821Sdg tcp_seq rcv_adv; /* advertised window */ 901541Srgrimes u_long rcv_wnd; /* receive window */ 911541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 9232821Sdg 9332821Sdg u_long snd_wnd; /* send window */ 941541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 9513765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 961541Srgrimes * for slow start exponential to 971541Srgrimes * linear switch 981541Srgrimes */ 9932821Sdg u_int t_maxopd; /* mss plus options */ 10032821Sdg 10111187Swollman u_int t_idle; /* inactivity time */ 10232821Sdg u_long t_duration; /* connection duration */ 10311187Swollman int t_rtt; /* round trip time */ 1041541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 10532821Sdg 10632821Sdg int t_rxtcur; /* current retransmit value */ 10732821Sdg u_int t_maxseg; /* maximum segment size */ 10811187Swollman int t_srtt; /* smoothed round-trip time */ 10911187Swollman int t_rttvar; /* variance in round-trip time */ 11032821Sdg 11132821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 11211187Swollman u_int t_rttmin; /* minimum rtt allowed */ 11332821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1141541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1151541Srgrimes 11632821Sdg int t_softerror; /* possible error not yet reported */ 1171541Srgrimes/* out-of-band data */ 1181541Srgrimes char t_oobflags; /* have some */ 1191541Srgrimes char t_iobc; /* input character */ 1201541Srgrimes#define TCPOOB_HAVEDATA 0x01 1211541Srgrimes#define TCPOOB_HADDATA 0x02 1221541Srgrimes/* RFC 1323 variables */ 1231541Srgrimes u_char snd_scale; /* window scaling for send window */ 1241541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1251541Srgrimes u_char request_r_scale; /* pending window scaling */ 1261541Srgrimes u_char requested_s_scale; 1271541Srgrimes u_long ts_recent; /* timestamp echo data */ 12832821Sdg 1291541Srgrimes u_long ts_recent_age; /* when last updated */ 1301541Srgrimes tcp_seq last_ack_sent; 1316247Swollman/* RFC 1644 variables */ 1326247Swollman tcp_cc cc_send; /* send connection count */ 1336247Swollman tcp_cc cc_recv; /* receive connection count */ 1341541Srgrimes}; 1351541Srgrimes 1366247Swollman/* 1376247Swollman * Structure to hold TCP options that are only used during segment 1386247Swollman * processing (in tcp_input), but not held in the tcpcb. 1396247Swollman * It's basically used to reduce the number of parameters 1406247Swollman * to tcp_dooptions. 1416247Swollman */ 1426247Swollmanstruct tcpopt { 1436247Swollman u_long to_flag; /* which options are present */ 1446247Swollman#define TOF_TS 0x0001 /* timestamp */ 1456247Swollman#define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 1466247Swollman#define TOF_CCNEW 0x0004 1476247Swollman#define TOF_CCECHO 0x0008 1486247Swollman u_long to_tsval; 1496247Swollman u_long to_tsecr; 1506247Swollman tcp_cc to_cc; /* holds CC or CCnew */ 1516247Swollman tcp_cc to_ccecho; 1526247Swollman}; 1536247Swollman 1546247Swollman/* 1556247Swollman * The TAO cache entry which is stored in the protocol family specific 1566247Swollman * portion of the route metrics. 1576247Swollman */ 1586247Swollmanstruct rmxp_tao { 1596247Swollman tcp_cc tao_cc; /* latest CC in valid SYN */ 1606247Swollman tcp_cc tao_ccsent; /* latest CC sent to peer */ 1616247Swollman u_short tao_mssopt; /* peer's cached MSS */ 1626247Swollman#ifdef notyet 1636247Swollman u_short tao_flags; /* cache status flags */ 1646247Swollman#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 1656247Swollman#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 1666247Swollman#define TAOF_UNDEF 0 /* we don't know yet */ 1676247Swollman#endif /* notyet */ 1686247Swollman}; 1696283Swollman#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 1706247Swollman 1711541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 1721541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 1731541Srgrimes 1741541Srgrimes/* 1751541Srgrimes * The smoothed round-trip time and estimated variance 1761541Srgrimes * are stored as fixed point numbers scaled by the values below. 1771541Srgrimes * For convenience, these scales are also used in smoothing the average 1781541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 1791541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 1801541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 1811541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 1821541Srgrimes */ 18314753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 18414753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 18514753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 18614753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 18714753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 1881541Srgrimes 1891541Srgrimes/* 1901541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 1911541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 1921541Srgrimes * will each average +1/2 tick of bias. When we compute 1931541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 1941541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 1951541Srgrimes * firing of the timer. The bias will give us exactly the 1961541Srgrimes * 1.5 tick we need. But, because the bias is 1971541Srgrimes * statistical, we have to test that we don't drop below 1981541Srgrimes * the minimum feasible timer (which is 2 ticks). 19914753Swollman * This version of the macro adapted from a paper by Lawrence 20014753Swollman * Brakmo and Larry Peterson which outlines a problem caused 20114753Swollman * by insufficient precision in the original implementation, 20214753Swollman * which results in inappropriately large RTO values for very 20314753Swollman * fast networks. 2041541Srgrimes */ 2051541Srgrimes#define TCP_REXMTVAL(tp) \ 20635419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 20716141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 2081541Srgrimes 2091541Srgrimes/* 2101541Srgrimes * TCP statistics. 2111541Srgrimes * Many of these should be kept per connection, 2121541Srgrimes * but that's inconvenient at the moment. 2131541Srgrimes */ 2141541Srgrimesstruct tcpstat { 2151541Srgrimes u_long tcps_connattempt; /* connections initiated */ 2161541Srgrimes u_long tcps_accepts; /* connections accepted */ 2171541Srgrimes u_long tcps_connects; /* connections established */ 2181541Srgrimes u_long tcps_drops; /* connections dropped */ 2191541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 2201541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 2211541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 2221541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 2231541Srgrimes u_long tcps_delack; /* delayed acks sent */ 2241541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 2251541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 2261541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 2271541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 2281541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 2291541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 2301541Srgrimes 2311541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 2321541Srgrimes u_long tcps_sndpack; /* data packets sent */ 2331541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 2341541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 2351541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 2361541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 2371541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 2381541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 2391541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 2401541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 2411541Srgrimes 2421541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 2431541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 2441541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 2451541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 2461541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 2471541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 2481541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 2491541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 2501541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 2511541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 2521541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 2531541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 2541541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 2551541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 2561541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 2571541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 2581541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 2591541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 2601541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 2611541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 2621541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 2631541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 2641541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 2651541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 2661541Srgrimes u_long tcps_pcbcachemiss; 2679263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 2689263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 2699263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 2709470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 2719470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 2729470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 27310937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 27410937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 27511415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 27614281Sbde u_long tcps_listendrop; /* listen queue overflows */ 2771541Srgrimes}; 2781541Srgrimes 2796247Swollman/* 28036079Swollman * TCB structure exported to user-land via sysctl(3). 28137183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 28237183Sjhay * included. Not all of our clients do. 28336079Swollman */ 28437183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 28536079Swollmanstruct xtcpcb { 28636079Swollman size_t xt_len; 28736079Swollman struct inpcb xt_inp; 28836079Swollman struct tcpcb xt_tp; 28936079Swollman struct xsocket xt_socket; 29036079Swollman u_quad_t xt_alignment_hack; 29136079Swollman}; 29236079Swollman#endif 29336079Swollman 29436079Swollman/* 2956247Swollman * Names for TCP sysctl objects 2966247Swollman */ 2976247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 2986247Swollman#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 2996247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 3006472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 3016472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 3026472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 3036472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 30418281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 30518281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 30618281Spst#define TCPCTL_KEEPINIT 10 /* receive buffer space */ 30736079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 30836079Swollman#define TCPCTL_MAXID 12 3096247Swollman 3106247Swollman#define TCPCTL_NAMES { \ 3116247Swollman { 0, 0 }, \ 3126348Swollman { "rfc1323", CTLTYPE_INT }, \ 3136348Swollman { "rfc1644", CTLTYPE_INT }, \ 3146247Swollman { "mssdflt", CTLTYPE_INT }, \ 3156472Swollman { "stats", CTLTYPE_STRUCT }, \ 3166472Swollman { "rttdflt", CTLTYPE_INT }, \ 3176472Swollman { "keepidle", CTLTYPE_INT }, \ 3186472Swollman { "keepintvl", CTLTYPE_INT }, \ 3196472Swollman { "sendspace", CTLTYPE_INT }, \ 3206472Swollman { "recvspace", CTLTYPE_INT }, \ 32118281Spst { "keepinit", CTLTYPE_INT }, \ 32236079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 3236247Swollman} 3246247Swollman 32544078Sdfr 3261541Srgrimes#ifdef KERNEL 32744078Sdfr#ifdef SYSCTL_DECL 32844078SdfrSYSCTL_DECL(_net_inet_tcp); 32944078Sdfr#endif 33044078Sdfr 3317684Sdgextern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 3327684Sdgextern struct inpcbinfo tcbinfo; 3336348Swollmanextern struct tcpstat tcpstat; /* tcp statistics */ 3347090Sbdeextern int tcp_mssdflt; /* XXX */ 3356348Swollmanextern u_long tcp_now; /* for RFC 1323 timestamps */ 33633846Sdgextern int tcp_delack_enabled; 3371541Srgrimes 3381541Srgrimesvoid tcp_canceltimers __P((struct tcpcb *)); 3391541Srgrimesstruct tcpcb * 3401541Srgrimes tcp_close __P((struct tcpcb *)); 34112881Sbdevoid tcp_ctlinput __P((int, struct sockaddr *, void *)); 34238482Swollmanint tcp_ctloutput __P((struct socket *, struct sockopt *)); 3431541Srgrimesstruct tcpcb * 3441541Srgrimes tcp_drop __P((struct tcpcb *, int)); 3451541Srgrimesvoid tcp_drain __P((void)); 3461541Srgrimesvoid tcp_fasttimo __P((void)); 3476247Swollmanstruct rmxp_tao * 3486247Swollman tcp_gettaocache __P((struct inpcb *)); 3491541Srgrimesvoid tcp_init __P((void)); 3501541Srgrimesvoid tcp_input __P((struct mbuf *, int)); 3516247Swollmanvoid tcp_mss __P((struct tcpcb *, int)); 3526247Swollmanint tcp_mssopt __P((struct tcpcb *)); 35312635Swollmanvoid tcp_mtudisc __P((struct inpcb *, int)); 3541541Srgrimesstruct tcpcb * 3551541Srgrimes tcp_newtcpcb __P((struct inpcb *)); 3561541Srgrimesint tcp_output __P((struct tcpcb *)); 3571541Srgrimesvoid tcp_quench __P((struct inpcb *, int)); 3581541Srgrimesvoid tcp_respond __P((struct tcpcb *, 35937622Sbde struct tcpiphdr *, struct mbuf *, tcp_seq, tcp_seq, int)); 3606247Swollmanstruct rtentry * 3616247Swollman tcp_rtlookup __P((struct inpcb *)); 3621541Srgrimesvoid tcp_setpersist __P((struct tcpcb *)); 3631541Srgrimesvoid tcp_slowtimo __P((void)); 3641541Srgrimesstruct tcpiphdr * 3651541Srgrimes tcp_template __P((struct tcpcb *)); 3661541Srgrimesstruct tcpcb * 3671541Srgrimes tcp_timers __P((struct tcpcb *, int)); 3681541Srgrimesvoid tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int)); 3699470Swollman 37017096Swollmanextern struct pr_usrreqs tcp_usrreqs; 3719470Swollmanextern u_long tcp_sendspace; 3729470Swollmanextern u_long tcp_recvspace; 3739470Swollman 3746348Swollman#endif /* KERNEL */ 3752169Spaul 3766348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 377