tcp_var.h revision 109175
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 3450477Speter * $FreeBSD: head/sys/netinet/tcp_var.h 109175 2003-01-13 11:01:20Z hsu $ 351541Srgrimes */ 361541Srgrimes 372169Spaul#ifndef _NETINET_TCP_VAR_H_ 382169Spaul#define _NETINET_TCP_VAR_H_ 3986764Sjlemon 4086764Sjlemon#include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 4198102Shsu#include <netinet/tcp.h> 4286764Sjlemon 431541Srgrimes/* 441541Srgrimes * Kernel variables for tcp. 451541Srgrimes */ 4686764Sjlemonextern int tcp_do_rfc1323; 4786764Sjlemonextern int tcp_do_rfc1644; 481541Srgrimes 4955679Sshin/* TCP segment queue entry */ 5055679Sshinstruct tseg_qent { 5160938Sjake LIST_ENTRY(tseg_qent) tqe_q; 5255679Sshin int tqe_len; /* TCP segment data length */ 5355679Sshin struct tcphdr *tqe_th; /* a pointer to tcp header */ 5455679Sshin struct mbuf *tqe_m; /* mbuf contains packet */ 5555679Sshin}; 5660938SjakeLIST_HEAD(tsegqe_head, tseg_qent); 5755679Sshin#ifdef MALLOC_DECLARE 5855679SshinMALLOC_DECLARE(M_TSEGQ); 5955679Sshin#endif 6055679Sshin 6155679Sshinstruct tcptemp { 6255679Sshin u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 6355679Sshin struct tcphdr tt_t; 6455679Sshin}; 6555679Sshin 6655679Sshin#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 6755679Sshin 681541Srgrimes/* 691541Srgrimes * Tcp control block, one per tcp; fields: 7032821Sdg * Organized for 16 byte cacheline efficiency. 711541Srgrimes */ 721541Srgrimesstruct tcpcb { 7355679Sshin struct tsegqe_head t_segq; 7432821Sdg int t_dupacks; /* consecutive dup acks recd */ 7578642Ssilby struct tcptemp *unused; /* unused */ 7632821Sdg 7750673Sjlemon struct callout *tt_rexmt; /* retransmit timer */ 7850673Sjlemon struct callout *tt_persist; /* retransmit persistence */ 7950673Sjlemon struct callout *tt_keep; /* keepalive */ 8050673Sjlemon struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 8150673Sjlemon struct callout *tt_delack; /* delayed ACK timer */ 8232821Sdg 8332821Sdg struct inpcb *t_inpcb; /* back pointer to internet pcb */ 8411187Swollman int t_state; /* state of this connection */ 8511187Swollman u_int t_flags; 8642902Sfenner#define TF_ACKNOW 0x00001 /* ack peer immediately */ 8742902Sfenner#define TF_DELACK 0x00002 /* ack, but try to delay it */ 8842902Sfenner#define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ 8942902Sfenner#define TF_NOOPT 0x00008 /* don't use tcp options */ 9042902Sfenner#define TF_SENTFIN 0x00010 /* have sent FIN */ 9142902Sfenner#define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ 9242902Sfenner#define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ 9342902Sfenner#define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ 9442902Sfenner#define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ 9542902Sfenner#define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ 9642902Sfenner#define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */ 9742902Sfenner#define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ 9842902Sfenner#define TF_NOPUSH 0x01000 /* don't push */ 9942902Sfenner#define TF_REQ_CC 0x02000 /* have/will request CC */ 10042902Sfenner#define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ 10142902Sfenner#define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */ 10242902Sfenner#define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ 10363745Sjayanth#define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */ 10484564Sjayanth#define TF_LASTIDLE 0x40000 /* connection was previously idle */ 10587193Sdillon#define TF_RXWIN0SENT 0x80000 /* sent a receiver win 0 in response */ 10632821Sdg int t_force; /* 1 if forcing out a byte */ 1071541Srgrimes 1081541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 10932821Sdg tcp_seq snd_max; /* highest sequence number sent; 11032821Sdg * used to recognize retransmits 11132821Sdg */ 1121541Srgrimes tcp_seq snd_nxt; /* send next */ 1131541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 11432821Sdg 1151541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 1161541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 1171541Srgrimes tcp_seq iss; /* initial send sequence number */ 11832821Sdg tcp_seq irs; /* initial receive sequence number */ 11932821Sdg 12032821Sdg tcp_seq rcv_nxt; /* receive next */ 12132821Sdg tcp_seq rcv_adv; /* advertised window */ 1221541Srgrimes u_long rcv_wnd; /* receive window */ 1231541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 12432821Sdg 12532821Sdg u_long snd_wnd; /* send window */ 1261541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 127102017Sdillon u_long snd_bwnd; /* bandwidth-controlled window */ 12813765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 1291541Srgrimes * for slow start exponential to 1301541Srgrimes * linear switch 1311541Srgrimes */ 132102017Sdillon u_long snd_bandwidth; /* calculated bandwidth or 0 */ 133109175Shsu tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 134109175Shsu tcp_seq snd_high; /* for use in NewReno Fast Recovery */ 13560067Sjlemon 13632821Sdg u_int t_maxopd; /* mss plus options */ 13732821Sdg 13850673Sjlemon u_long t_rcvtime; /* inactivity time */ 13950673Sjlemon u_long t_starttime; /* time connection was established */ 14050673Sjlemon int t_rtttime; /* round trip time */ 1411541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 14232821Sdg 143102017Sdillon int t_bw_rtttime; /* used for bandwidth calculation */ 144102017Sdillon tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 145102017Sdillon 14650673Sjlemon int t_rxtcur; /* current retransmit value (ticks) */ 14732821Sdg u_int t_maxseg; /* maximum segment size */ 14811187Swollman int t_srtt; /* smoothed round-trip time */ 14911187Swollman int t_rttvar; /* variance in round-trip time */ 15032821Sdg 15132821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 15211187Swollman u_int t_rttmin; /* minimum rtt allowed */ 153102017Sdillon u_int t_rttbest; /* best rtt we've seen */ 15432821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1551541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1561541Srgrimes 15732821Sdg int t_softerror; /* possible error not yet reported */ 1581541Srgrimes/* out-of-band data */ 1591541Srgrimes char t_oobflags; /* have some */ 1601541Srgrimes char t_iobc; /* input character */ 1611541Srgrimes#define TCPOOB_HAVEDATA 0x01 1621541Srgrimes#define TCPOOB_HADDATA 0x02 1631541Srgrimes/* RFC 1323 variables */ 1641541Srgrimes u_char snd_scale; /* window scaling for send window */ 1651541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1661541Srgrimes u_char request_r_scale; /* pending window scaling */ 1671541Srgrimes u_char requested_s_scale; 1681541Srgrimes u_long ts_recent; /* timestamp echo data */ 16932821Sdg 1701541Srgrimes u_long ts_recent_age; /* when last updated */ 1711541Srgrimes tcp_seq last_ack_sent; 1726247Swollman/* RFC 1644 variables */ 1736247Swollman tcp_cc cc_send; /* send connection count */ 1746247Swollman tcp_cc cc_recv; /* receive connection count */ 17550673Sjlemon/* experimental */ 17650673Sjlemon u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 17750673Sjlemon u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 178109175Shsu tcp_seq snd_high_prev; /* snd_high prior to retransmit */ 17950673Sjlemon u_long t_badrxtwin; /* window for retransmit recovery */ 1801541Srgrimes}; 1811541Srgrimes 1826247Swollman/* 1836247Swollman * Structure to hold TCP options that are only used during segment 1846247Swollman * processing (in tcp_input), but not held in the tcpcb. 1856247Swollman * It's basically used to reduce the number of parameters 1866247Swollman * to tcp_dooptions. 1876247Swollman */ 1886247Swollmanstruct tcpopt { 18986764Sjlemon u_long to_flags; /* which options are present */ 1906247Swollman#define TOF_TS 0x0001 /* timestamp */ 1916247Swollman#define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 1926247Swollman#define TOF_CCNEW 0x0004 1936247Swollman#define TOF_CCECHO 0x0008 19486764Sjlemon#define TOF_MSS 0x0010 19586764Sjlemon#define TOF_SCALE 0x0020 19686764Sjlemon u_int32_t to_tsval; 19786764Sjlemon u_int32_t to_tsecr; 19886764Sjlemon tcp_cc to_cc; /* holds CC or CCnew */ 19986764Sjlemon tcp_cc to_ccecho; 20086764Sjlemon u_int16_t to_mss; 20186764Sjlemon u_int8_t to_requested_s_scale; 20286764Sjlemon u_int8_t to_pad; 2036247Swollman}; 2046247Swollman 20586764Sjlemonstruct syncache { 20686764Sjlemon inp_gen_t sc_inp_gencnt; /* pointer check */ 20786764Sjlemon struct tcpcb *sc_tp; /* tcb for listening socket */ 20886764Sjlemon struct mbuf *sc_ipopts; /* source route */ 20986764Sjlemon struct in_conninfo sc_inc; /* addresses */ 21086764Sjlemon#define sc_route sc_inc.inc_route 21186764Sjlemon#define sc_route6 sc_inc.inc6_route 21286764Sjlemon u_int32_t sc_tsrecent; 21386764Sjlemon tcp_cc sc_cc_send; /* holds CC or CCnew */ 21486764Sjlemon tcp_cc sc_cc_recv; 21586764Sjlemon tcp_seq sc_irs; /* seq from peer */ 21686764Sjlemon tcp_seq sc_iss; /* our ISS */ 21786764Sjlemon u_long sc_rxttime; /* retransmit time */ 21886764Sjlemon u_int16_t sc_rxtslot; /* retransmit counter */ 21986764Sjlemon u_int16_t sc_peer_mss; /* peer's MSS */ 22086764Sjlemon u_int16_t sc_wnd; /* advertised window */ 22186764Sjlemon u_int8_t sc_requested_s_scale:4, 22286764Sjlemon sc_request_r_scale:4; 22386764Sjlemon u_int8_t sc_flags; 22486764Sjlemon#define SCF_NOOPT 0x01 /* no TCP options */ 22586764Sjlemon#define SCF_WINSCALE 0x02 /* negotiated window scaling */ 22686764Sjlemon#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 22786764Sjlemon#define SCF_CC 0x08 /* negotiated CC */ 22886764Sjlemon#define SCF_UNREACH 0x10 /* icmp unreachable received */ 22986764Sjlemon#define SCF_KEEPROUTE 0x20 /* keep cloned route */ 23086764Sjlemon TAILQ_ENTRY(syncache) sc_hash; 23186764Sjlemon TAILQ_ENTRY(syncache) sc_timerq; 23286764Sjlemon}; 23386764Sjlemon 23486764Sjlemonstruct syncache_head { 23586764Sjlemon TAILQ_HEAD(, syncache) sch_bucket; 23686764Sjlemon u_int sch_length; 23786764Sjlemon}; 23886764Sjlemon 2396247Swollman/* 2406247Swollman * The TAO cache entry which is stored in the protocol family specific 2416247Swollman * portion of the route metrics. 2426247Swollman */ 2436247Swollmanstruct rmxp_tao { 2446247Swollman tcp_cc tao_cc; /* latest CC in valid SYN */ 2456247Swollman tcp_cc tao_ccsent; /* latest CC sent to peer */ 2466247Swollman u_short tao_mssopt; /* peer's cached MSS */ 2476247Swollman#ifdef notyet 2486247Swollman u_short tao_flags; /* cache status flags */ 2496247Swollman#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 2506247Swollman#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 2516247Swollman#define TAOF_UNDEF 0 /* we don't know yet */ 2526247Swollman#endif /* notyet */ 2536247Swollman}; 2546283Swollman#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 2556247Swollman 2561541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 2571541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 2581541Srgrimes 2591541Srgrimes/* 2601541Srgrimes * The smoothed round-trip time and estimated variance 2611541Srgrimes * are stored as fixed point numbers scaled by the values below. 2621541Srgrimes * For convenience, these scales are also used in smoothing the average 2631541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 2641541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 2651541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 2661541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 2671541Srgrimes */ 26814753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 26914753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 27014753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 27114753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 27214753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 2731541Srgrimes 2741541Srgrimes/* 2751541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 2761541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 2771541Srgrimes * will each average +1/2 tick of bias. When we compute 2781541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 2791541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 2801541Srgrimes * firing of the timer. The bias will give us exactly the 2811541Srgrimes * 1.5 tick we need. But, because the bias is 2821541Srgrimes * statistical, we have to test that we don't drop below 2831541Srgrimes * the minimum feasible timer (which is 2 ticks). 28414753Swollman * This version of the macro adapted from a paper by Lawrence 28514753Swollman * Brakmo and Larry Peterson which outlines a problem caused 28614753Swollman * by insufficient precision in the original implementation, 28714753Swollman * which results in inappropriately large RTO values for very 28814753Swollman * fast networks. 2891541Srgrimes */ 2901541Srgrimes#define TCP_REXMTVAL(tp) \ 29135419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 29216141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 2931541Srgrimes 2941541Srgrimes/* 2951541Srgrimes * TCP statistics. 2961541Srgrimes * Many of these should be kept per connection, 2971541Srgrimes * but that's inconvenient at the moment. 2981541Srgrimes */ 2991541Srgrimesstruct tcpstat { 3001541Srgrimes u_long tcps_connattempt; /* connections initiated */ 3011541Srgrimes u_long tcps_accepts; /* connections accepted */ 3021541Srgrimes u_long tcps_connects; /* connections established */ 3031541Srgrimes u_long tcps_drops; /* connections dropped */ 3041541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 3051541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 3061541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 3071541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 3081541Srgrimes u_long tcps_delack; /* delayed acks sent */ 3091541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 3101541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 3111541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 3121541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 3131541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 3141541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 3151541Srgrimes 3161541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 3171541Srgrimes u_long tcps_sndpack; /* data packets sent */ 3181541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 3191541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 3201541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 321100373Sdillon u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 3221541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 3231541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 3241541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 3251541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 3261541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 3271541Srgrimes 3281541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 3291541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 3301541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 3311541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 3321541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 33352904Sshin u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 3341541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 3351541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 3361541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 3371541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 3381541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 3391541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 3401541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 3411541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 3421541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 3431541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 3441541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 3451541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 3461541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 3471541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 3481541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 3491541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 3501541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 3511541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 3521541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 3531541Srgrimes u_long tcps_pcbcachemiss; 3549263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 3559263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 3569263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 3579470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 3589470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 3599470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 36010937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 36110937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 36211415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 36314281Sbde u_long tcps_listendrop; /* listen queue overflows */ 36486764Sjlemon 36586764Sjlemon u_long tcps_sc_added; /* entry added to syncache */ 36686764Sjlemon u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 36786764Sjlemon u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 36886764Sjlemon u_long tcps_sc_dropped; /* could not reply to packet */ 36986764Sjlemon u_long tcps_sc_completed; /* successful extraction of entry */ 37086764Sjlemon u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 37186764Sjlemon u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 37286764Sjlemon u_long tcps_sc_reset; /* RST removed entry from syncache */ 37386764Sjlemon u_long tcps_sc_stale; /* timed out or listen socket gone */ 37486764Sjlemon u_long tcps_sc_aborted; /* syncache entry aborted */ 37586764Sjlemon u_long tcps_sc_badack; /* removed due to bad ACK */ 37686764Sjlemon u_long tcps_sc_unreach; /* ICMP unreachable received */ 37786764Sjlemon u_long tcps_sc_zonefail; /* zalloc() failed */ 37886764Sjlemon u_long tcps_sc_sendcookie; /* SYN cookie sent */ 37986764Sjlemon u_long tcps_sc_recvcookie; /* SYN cookie received */ 3801541Srgrimes}; 3811541Srgrimes 3826247Swollman/* 38336079Swollman * TCB structure exported to user-land via sysctl(3). 38437183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 38537183Sjhay * included. Not all of our clients do. 38636079Swollman */ 38737183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 38836079Swollmanstruct xtcpcb { 38936079Swollman size_t xt_len; 39036079Swollman struct inpcb xt_inp; 39136079Swollman struct tcpcb xt_tp; 39236079Swollman struct xsocket xt_socket; 39336079Swollman u_quad_t xt_alignment_hack; 39436079Swollman}; 39536079Swollman#endif 39636079Swollman 39736079Swollman/* 3986247Swollman * Names for TCP sysctl objects 3996247Swollman */ 4006247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 4016247Swollman#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 4026247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 4036472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 4046472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 4056472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 4066472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 40718281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 40818281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 40963431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 41036079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 41150673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 41252904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 41352904Sshin#define TCPCTL_MAXID 14 4146247Swollman 4156247Swollman#define TCPCTL_NAMES { \ 4166247Swollman { 0, 0 }, \ 4176348Swollman { "rfc1323", CTLTYPE_INT }, \ 4186348Swollman { "rfc1644", CTLTYPE_INT }, \ 4196247Swollman { "mssdflt", CTLTYPE_INT }, \ 4206472Swollman { "stats", CTLTYPE_STRUCT }, \ 4216472Swollman { "rttdflt", CTLTYPE_INT }, \ 4226472Swollman { "keepidle", CTLTYPE_INT }, \ 4236472Swollman { "keepintvl", CTLTYPE_INT }, \ 4246472Swollman { "sendspace", CTLTYPE_INT }, \ 4256472Swollman { "recvspace", CTLTYPE_INT }, \ 42618281Spst { "keepinit", CTLTYPE_INT }, \ 42736079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 42850673Sjlemon { "delacktime", CTLTYPE_INT }, \ 42952904Sshin { "v6mssdflt", CTLTYPE_INT }, \ 4306247Swollman} 4316247Swollman 43244078Sdfr 43355205Speter#ifdef _KERNEL 43444078Sdfr#ifdef SYSCTL_DECL 43544078SdfrSYSCTL_DECL(_net_inet_tcp); 43644078Sdfr#endif 43744078Sdfr 4387684Sdgextern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 4397684Sdgextern struct inpcbinfo tcbinfo; 4406348Swollmanextern struct tcpstat tcpstat; /* tcp statistics */ 4417090Sbdeextern int tcp_mssdflt; /* XXX */ 44233846Sdgextern int tcp_delack_enabled; 44360067Sjlemonextern int tcp_do_newreno; 44498204Ssilbyextern int path_mtu_discovery; 44550673Sjlemonextern int ss_fltsz; 44650673Sjlemonextern int ss_fltsz_local; 4471541Srgrimes 44892723Salfredvoid tcp_canceltimers(struct tcpcb *); 4491541Srgrimesstruct tcpcb * 45092723Salfred tcp_close(struct tcpcb *); 45192723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 45292723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 4531541Srgrimesstruct tcpcb * 45492723Salfred tcp_drop(struct tcpcb *, int); 45592723Salfredvoid tcp_drain(void); 45692723Salfredvoid tcp_fasttimo(void); 4576247Swollmanstruct rmxp_tao * 45892723Salfred tcp_gettaocache(struct in_conninfo *); 45992723Salfredvoid tcp_init(void); 46092723Salfredvoid tcp_input(struct mbuf *, int); 46192723Salfredvoid tcp_mss(struct tcpcb *, int); 46292723Salfredint tcp_mssopt(struct tcpcb *); 46398211Shsustruct inpcb * 46498211Shsu tcp_drop_syn_sent(struct inpcb *, int); 46598211Shsustruct inpcb * 46698211Shsu tcp_mtudisc(struct inpcb *, int); 4671541Srgrimesstruct tcpcb * 46892723Salfred tcp_newtcpcb(struct inpcb *); 46992723Salfredint tcp_output(struct tcpcb *); 47098211Shsustruct inpcb * 47198211Shsu tcp_quench(struct inpcb *, int); 47292723Salfredvoid tcp_respond(struct tcpcb *, void *, 47392723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 4746247Swollmanstruct rtentry * 47592723Salfred tcp_rtlookup(struct in_conninfo *); 47692723Salfredvoid tcp_setpersist(struct tcpcb *); 47792723Salfredvoid tcp_slowtimo(void); 47855679Sshinstruct tcptemp * 47992723Salfred tcp_maketemplate(struct tcpcb *); 48092723Salfredvoid tcp_fillheaders(struct tcpcb *, void *, void *); 4811541Srgrimesstruct tcpcb * 48292723Salfred tcp_timers(struct tcpcb *, int); 48392723Salfredvoid tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 484102017Sdillonvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 48586764Sjlemonvoid syncache_init(void); 48686764Sjlemonvoid syncache_unreach(struct in_conninfo *, struct tcphdr *); 48786764Sjlemonint syncache_expand(struct in_conninfo *, struct tcphdr *, 48886764Sjlemon struct socket **, struct mbuf *); 48986764Sjlemonint syncache_add(struct in_conninfo *, struct tcpopt *, 49086764Sjlemon struct tcphdr *, struct socket **, struct mbuf *); 49186764Sjlemonvoid syncache_chkrst(struct in_conninfo *, struct tcphdr *); 49286764Sjlemonvoid syncache_badack(struct in_conninfo *); 4939470Swollman 49417096Swollmanextern struct pr_usrreqs tcp_usrreqs; 4959470Swollmanextern u_long tcp_sendspace; 4969470Swollmanextern u_long tcp_recvspace; 49792723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 4989470Swollman 49955205Speter#endif /* _KERNEL */ 5002169Spaul 5016348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 502