tcp_var.h revision 121850
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 121850 2003-11-01 07:30:08Z silby $ 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; 86117650Shsu#define TF_ACKNOW 0x000001 /* ack peer immediately */ 87117650Shsu#define TF_DELACK 0x000002 /* ack, but try to delay it */ 88117650Shsu#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 89117650Shsu#define TF_NOOPT 0x000008 /* don't use tcp options */ 90117650Shsu#define TF_SENTFIN 0x000010 /* have sent FIN */ 91117650Shsu#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 92117650Shsu#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 93117650Shsu#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 94117650Shsu#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 95117650Shsu#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 96117650Shsu#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 97117650Shsu#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 98117650Shsu#define TF_NOPUSH 0x001000 /* don't push */ 99117650Shsu#define TF_REQ_CC 0x002000 /* have/will request CC */ 100117650Shsu#define TF_RCVD_CC 0x004000 /* a CC was received in SYN */ 101117650Shsu#define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */ 102117650Shsu#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 103117650Shsu#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 104117650Shsu#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 105117650Shsu#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 106117650Shsu#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 107117650Shsu#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 10832821Sdg int t_force; /* 1 if forcing out a byte */ 1091541Srgrimes 1101541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 11132821Sdg tcp_seq snd_max; /* highest sequence number sent; 11232821Sdg * used to recognize retransmits 11332821Sdg */ 1141541Srgrimes tcp_seq snd_nxt; /* send next */ 1151541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 11632821Sdg 1171541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 1181541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 1191541Srgrimes tcp_seq iss; /* initial send sequence number */ 12032821Sdg tcp_seq irs; /* initial receive sequence number */ 12132821Sdg 12232821Sdg tcp_seq rcv_nxt; /* receive next */ 12332821Sdg tcp_seq rcv_adv; /* advertised window */ 1241541Srgrimes u_long rcv_wnd; /* receive window */ 1251541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 12632821Sdg 12732821Sdg u_long snd_wnd; /* send window */ 1281541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 129102017Sdillon u_long snd_bwnd; /* bandwidth-controlled window */ 13013765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 1311541Srgrimes * for slow start exponential to 1321541Srgrimes * linear switch 1331541Srgrimes */ 134102017Sdillon u_long snd_bandwidth; /* calculated bandwidth or 0 */ 135109175Shsu tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 13660067Sjlemon 13732821Sdg u_int t_maxopd; /* mss plus options */ 13832821Sdg 13950673Sjlemon u_long t_rcvtime; /* inactivity time */ 14050673Sjlemon u_long t_starttime; /* time connection was established */ 14150673Sjlemon int t_rtttime; /* round trip time */ 1421541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 14332821Sdg 144102017Sdillon int t_bw_rtttime; /* used for bandwidth calculation */ 145102017Sdillon tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 146102017Sdillon 14750673Sjlemon int t_rxtcur; /* current retransmit value (ticks) */ 14832821Sdg u_int t_maxseg; /* maximum segment size */ 14911187Swollman int t_srtt; /* smoothed round-trip time */ 15011187Swollman int t_rttvar; /* variance in round-trip time */ 15132821Sdg 15232821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 15311187Swollman u_int t_rttmin; /* minimum rtt allowed */ 154102017Sdillon u_int t_rttbest; /* best rtt we've seen */ 15532821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1561541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1571541Srgrimes 15832821Sdg int t_softerror; /* possible error not yet reported */ 1591541Srgrimes/* out-of-band data */ 1601541Srgrimes char t_oobflags; /* have some */ 1611541Srgrimes char t_iobc; /* input character */ 1621541Srgrimes#define TCPOOB_HAVEDATA 0x01 1631541Srgrimes#define TCPOOB_HADDATA 0x02 1641541Srgrimes/* RFC 1323 variables */ 1651541Srgrimes u_char snd_scale; /* window scaling for send window */ 1661541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1671541Srgrimes u_char request_r_scale; /* pending window scaling */ 1681541Srgrimes u_char requested_s_scale; 1691541Srgrimes u_long ts_recent; /* timestamp echo data */ 17032821Sdg 1711541Srgrimes u_long ts_recent_age; /* when last updated */ 1721541Srgrimes tcp_seq last_ack_sent; 1736247Swollman/* RFC 1644 variables */ 1746247Swollman tcp_cc cc_send; /* send connection count */ 1756247Swollman tcp_cc cc_recv; /* receive connection count */ 17650673Sjlemon/* experimental */ 17750673Sjlemon u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 17850673Sjlemon u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 179117650Shsu tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 18050673Sjlemon u_long t_badrxtwin; /* window for retransmit recovery */ 181112957Shsu u_char snd_limited; /* segments limited transmitted */ 1821541Srgrimes}; 1831541Srgrimes 184117650Shsu#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 185117650Shsu#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 186117650Shsu#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 187117650Shsu 1886247Swollman/* 1896247Swollman * Structure to hold TCP options that are only used during segment 1906247Swollman * processing (in tcp_input), but not held in the tcpcb. 1916247Swollman * It's basically used to reduce the number of parameters 1926247Swollman * to tcp_dooptions. 1936247Swollman */ 1946247Swollmanstruct tcpopt { 19586764Sjlemon u_long to_flags; /* which options are present */ 1966247Swollman#define TOF_TS 0x0001 /* timestamp */ 1976247Swollman#define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 1986247Swollman#define TOF_CCNEW 0x0004 1996247Swollman#define TOF_CCECHO 0x0008 20086764Sjlemon#define TOF_MSS 0x0010 20186764Sjlemon#define TOF_SCALE 0x0020 20286764Sjlemon u_int32_t to_tsval; 20386764Sjlemon u_int32_t to_tsecr; 20486764Sjlemon tcp_cc to_cc; /* holds CC or CCnew */ 20586764Sjlemon tcp_cc to_ccecho; 20686764Sjlemon u_int16_t to_mss; 20786764Sjlemon u_int8_t to_requested_s_scale; 20886764Sjlemon u_int8_t to_pad; 2096247Swollman}; 2106247Swollman 21186764Sjlemonstruct syncache { 21286764Sjlemon inp_gen_t sc_inp_gencnt; /* pointer check */ 21386764Sjlemon struct tcpcb *sc_tp; /* tcb for listening socket */ 21486764Sjlemon struct mbuf *sc_ipopts; /* source route */ 21586764Sjlemon struct in_conninfo sc_inc; /* addresses */ 21686764Sjlemon#define sc_route sc_inc.inc_route 21786764Sjlemon#define sc_route6 sc_inc.inc6_route 21886764Sjlemon u_int32_t sc_tsrecent; 21986764Sjlemon tcp_cc sc_cc_send; /* holds CC or CCnew */ 22086764Sjlemon tcp_cc sc_cc_recv; 22186764Sjlemon tcp_seq sc_irs; /* seq from peer */ 22286764Sjlemon tcp_seq sc_iss; /* our ISS */ 22386764Sjlemon u_long sc_rxttime; /* retransmit time */ 22486764Sjlemon u_int16_t sc_rxtslot; /* retransmit counter */ 22586764Sjlemon u_int16_t sc_peer_mss; /* peer's MSS */ 22686764Sjlemon u_int16_t sc_wnd; /* advertised window */ 22786764Sjlemon u_int8_t sc_requested_s_scale:4, 22886764Sjlemon sc_request_r_scale:4; 22986764Sjlemon u_int8_t sc_flags; 23086764Sjlemon#define SCF_NOOPT 0x01 /* no TCP options */ 23186764Sjlemon#define SCF_WINSCALE 0x02 /* negotiated window scaling */ 23286764Sjlemon#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 23386764Sjlemon#define SCF_CC 0x08 /* negotiated CC */ 23486764Sjlemon#define SCF_UNREACH 0x10 /* icmp unreachable received */ 23586764Sjlemon#define SCF_KEEPROUTE 0x20 /* keep cloned route */ 23686764Sjlemon TAILQ_ENTRY(syncache) sc_hash; 23786764Sjlemon TAILQ_ENTRY(syncache) sc_timerq; 23886764Sjlemon}; 23986764Sjlemon 24086764Sjlemonstruct syncache_head { 24186764Sjlemon TAILQ_HEAD(, syncache) sch_bucket; 24286764Sjlemon u_int sch_length; 24386764Sjlemon}; 244111145Sjlemon 245111145Sjlemonstruct tcptw { 246111145Sjlemon struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 247111145Sjlemon tcp_seq snd_nxt; 248111145Sjlemon tcp_seq rcv_nxt; 249121850Ssilby tcp_seq iss; 250111145Sjlemon tcp_cc cc_recv; 251111145Sjlemon tcp_cc cc_send; 252111145Sjlemon u_short last_win; /* cached window value */ 253111145Sjlemon u_short tw_so_options; /* copy of so_options */ 254111145Sjlemon struct ucred *tw_cred; /* user credentials */ 255111145Sjlemon u_long t_recent; 256111145Sjlemon u_long t_starttime; 257112009Sjlemon int tw_time; 258112009Sjlemon LIST_ENTRY(tcptw) tw_2msl; 259111145Sjlemon}; 26086764Sjlemon 2616247Swollman/* 2626247Swollman * The TAO cache entry which is stored in the protocol family specific 2636247Swollman * portion of the route metrics. 2646247Swollman */ 2656247Swollmanstruct rmxp_tao { 2666247Swollman tcp_cc tao_cc; /* latest CC in valid SYN */ 2676247Swollman tcp_cc tao_ccsent; /* latest CC sent to peer */ 2686247Swollman u_short tao_mssopt; /* peer's cached MSS */ 2696247Swollman#ifdef notyet 2706247Swollman u_short tao_flags; /* cache status flags */ 2716247Swollman#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 2726247Swollman#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 2736247Swollman#define TAOF_UNDEF 0 /* we don't know yet */ 2746247Swollman#endif /* notyet */ 2756247Swollman}; 2766283Swollman#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 2776247Swollman 2781541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 279111145Sjlemon#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 2801541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 2811541Srgrimes 2821541Srgrimes/* 2831541Srgrimes * The smoothed round-trip time and estimated variance 2841541Srgrimes * are stored as fixed point numbers scaled by the values below. 2851541Srgrimes * For convenience, these scales are also used in smoothing the average 2861541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 2871541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 2881541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 2891541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 2901541Srgrimes */ 29114753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 29214753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 29314753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 29414753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 29514753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 2961541Srgrimes 2971541Srgrimes/* 2981541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 2991541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 3001541Srgrimes * will each average +1/2 tick of bias. When we compute 3011541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 3021541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 3031541Srgrimes * firing of the timer. The bias will give us exactly the 3041541Srgrimes * 1.5 tick we need. But, because the bias is 3051541Srgrimes * statistical, we have to test that we don't drop below 3061541Srgrimes * the minimum feasible timer (which is 2 ticks). 30714753Swollman * This version of the macro adapted from a paper by Lawrence 30814753Swollman * Brakmo and Larry Peterson which outlines a problem caused 30914753Swollman * by insufficient precision in the original implementation, 31014753Swollman * which results in inappropriately large RTO values for very 31114753Swollman * fast networks. 3121541Srgrimes */ 3131541Srgrimes#define TCP_REXMTVAL(tp) \ 31435419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 31516141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 3161541Srgrimes 3171541Srgrimes/* 3181541Srgrimes * TCP statistics. 3191541Srgrimes * Many of these should be kept per connection, 3201541Srgrimes * but that's inconvenient at the moment. 3211541Srgrimes */ 3221541Srgrimesstruct tcpstat { 3231541Srgrimes u_long tcps_connattempt; /* connections initiated */ 3241541Srgrimes u_long tcps_accepts; /* connections accepted */ 3251541Srgrimes u_long tcps_connects; /* connections established */ 3261541Srgrimes u_long tcps_drops; /* connections dropped */ 3271541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 3281541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 3291541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 3301541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 3311541Srgrimes u_long tcps_delack; /* delayed acks sent */ 3321541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 3331541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 3341541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 3351541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 3361541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 3371541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 3381541Srgrimes 3391541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 3401541Srgrimes u_long tcps_sndpack; /* data packets sent */ 3411541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 3421541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 3431541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 344100373Sdillon u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 3451541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 3461541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 3471541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 3481541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 3491541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 3501541Srgrimes 3511541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 3521541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 3531541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 3541541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 3551541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 35652904Sshin u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 3571541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 3581541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 3591541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 3601541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 3611541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 3621541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 3631541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 3641541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 3651541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 3661541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 3671541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 3681541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 3691541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 3701541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 3711541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 3721541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 3731541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 3741541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 3751541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 3761541Srgrimes u_long tcps_pcbcachemiss; 3779263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 3789263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 3799263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 3809470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 3819470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 3829470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 38310937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 38410937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 38511415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 38614281Sbde u_long tcps_listendrop; /* listen queue overflows */ 38786764Sjlemon 38886764Sjlemon u_long tcps_sc_added; /* entry added to syncache */ 38986764Sjlemon u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 39086764Sjlemon u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 39186764Sjlemon u_long tcps_sc_dropped; /* could not reply to packet */ 39286764Sjlemon u_long tcps_sc_completed; /* successful extraction of entry */ 39386764Sjlemon u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 39486764Sjlemon u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 39586764Sjlemon u_long tcps_sc_reset; /* RST removed entry from syncache */ 39686764Sjlemon u_long tcps_sc_stale; /* timed out or listen socket gone */ 39786764Sjlemon u_long tcps_sc_aborted; /* syncache entry aborted */ 39886764Sjlemon u_long tcps_sc_badack; /* removed due to bad ACK */ 39986764Sjlemon u_long tcps_sc_unreach; /* ICMP unreachable received */ 40086764Sjlemon u_long tcps_sc_zonefail; /* zalloc() failed */ 40186764Sjlemon u_long tcps_sc_sendcookie; /* SYN cookie sent */ 40286764Sjlemon u_long tcps_sc_recvcookie; /* SYN cookie received */ 4031541Srgrimes}; 4041541Srgrimes 4056247Swollman/* 40636079Swollman * TCB structure exported to user-land via sysctl(3). 40737183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 40837183Sjhay * included. Not all of our clients do. 40936079Swollman */ 41037183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 41136079Swollmanstruct xtcpcb { 41236079Swollman size_t xt_len; 41336079Swollman struct inpcb xt_inp; 41436079Swollman struct tcpcb xt_tp; 41536079Swollman struct xsocket xt_socket; 41636079Swollman u_quad_t xt_alignment_hack; 41736079Swollman}; 41836079Swollman#endif 41936079Swollman 42036079Swollman/* 4216247Swollman * Names for TCP sysctl objects 4226247Swollman */ 4236247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 4246247Swollman#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 4256247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 4266472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 4276472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 4286472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 4296472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 43018281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 43118281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 43263431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 43336079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 43450673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 43552904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 43652904Sshin#define TCPCTL_MAXID 14 4376247Swollman 4386247Swollman#define TCPCTL_NAMES { \ 4396247Swollman { 0, 0 }, \ 4406348Swollman { "rfc1323", CTLTYPE_INT }, \ 4416348Swollman { "rfc1644", CTLTYPE_INT }, \ 4426247Swollman { "mssdflt", CTLTYPE_INT }, \ 4436472Swollman { "stats", CTLTYPE_STRUCT }, \ 4446472Swollman { "rttdflt", CTLTYPE_INT }, \ 4456472Swollman { "keepidle", CTLTYPE_INT }, \ 4466472Swollman { "keepintvl", CTLTYPE_INT }, \ 4476472Swollman { "sendspace", CTLTYPE_INT }, \ 4486472Swollman { "recvspace", CTLTYPE_INT }, \ 44918281Spst { "keepinit", CTLTYPE_INT }, \ 45036079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 45150673Sjlemon { "delacktime", CTLTYPE_INT }, \ 45252904Sshin { "v6mssdflt", CTLTYPE_INT }, \ 4536247Swollman} 4546247Swollman 45544078Sdfr 45655205Speter#ifdef _KERNEL 45744078Sdfr#ifdef SYSCTL_DECL 45844078SdfrSYSCTL_DECL(_net_inet_tcp); 45944078Sdfr#endif 46044078Sdfr 4617684Sdgextern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 4627684Sdgextern struct inpcbinfo tcbinfo; 4636348Swollmanextern struct tcpstat tcpstat; /* tcp statistics */ 4647090Sbdeextern int tcp_mssdflt; /* XXX */ 46533846Sdgextern int tcp_delack_enabled; 46660067Sjlemonextern int tcp_do_newreno; 46798204Ssilbyextern int path_mtu_discovery; 46850673Sjlemonextern int ss_fltsz; 46950673Sjlemonextern int ss_fltsz_local; 4701541Srgrimes 47192723Salfredvoid tcp_canceltimers(struct tcpcb *); 4721541Srgrimesstruct tcpcb * 47392723Salfred tcp_close(struct tcpcb *); 474111145Sjlemonvoid tcp_twstart(struct tcpcb *); 475121850Ssilbyint tcp_twrecycleable(struct tcptw *tw); 476112009Sjlemonstruct tcptw * 477112009Sjlemon tcp_twclose(struct tcptw *_tw, int _reuse); 47892723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 47992723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 4801541Srgrimesstruct tcpcb * 48192723Salfred tcp_drop(struct tcpcb *, int); 48292723Salfredvoid tcp_drain(void); 48392723Salfredvoid tcp_fasttimo(void); 4846247Swollmanstruct rmxp_tao * 48592723Salfred tcp_gettaocache(struct in_conninfo *); 48692723Salfredvoid tcp_init(void); 48792723Salfredvoid tcp_input(struct mbuf *, int); 48892723Salfredvoid tcp_mss(struct tcpcb *, int); 48992723Salfredint tcp_mssopt(struct tcpcb *); 49098211Shsustruct inpcb * 49198211Shsu tcp_drop_syn_sent(struct inpcb *, int); 49298211Shsustruct inpcb * 49398211Shsu tcp_mtudisc(struct inpcb *, int); 4941541Srgrimesstruct tcpcb * 49592723Salfred tcp_newtcpcb(struct inpcb *); 49692723Salfredint tcp_output(struct tcpcb *); 49798211Shsustruct inpcb * 49898211Shsu tcp_quench(struct inpcb *, int); 49992723Salfredvoid tcp_respond(struct tcpcb *, void *, 50092723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 501114794Srwatsonint tcp_twrespond(struct tcptw *, struct socket *, struct mbuf *, int); 5026247Swollmanstruct rtentry * 50392723Salfred tcp_rtlookup(struct in_conninfo *); 50492723Salfredvoid tcp_setpersist(struct tcpcb *); 50592723Salfredvoid tcp_slowtimo(void); 50655679Sshinstruct tcptemp * 507111144Sjlemon tcpip_maketemplate(struct inpcb *); 508111144Sjlemonvoid tcpip_fillheaders(struct inpcb *, void *, void *); 5091541Srgrimesstruct tcpcb * 51092723Salfred tcp_timers(struct tcpcb *, int); 51192723Salfredvoid tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 512102017Sdillonvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 51386764Sjlemonvoid syncache_init(void); 51486764Sjlemonvoid syncache_unreach(struct in_conninfo *, struct tcphdr *); 51586764Sjlemonint syncache_expand(struct in_conninfo *, struct tcphdr *, 51686764Sjlemon struct socket **, struct mbuf *); 51786764Sjlemonint syncache_add(struct in_conninfo *, struct tcpopt *, 51886764Sjlemon struct tcphdr *, struct socket **, struct mbuf *); 51986764Sjlemonvoid syncache_chkrst(struct in_conninfo *, struct tcphdr *); 52086764Sjlemonvoid syncache_badack(struct in_conninfo *); 5219470Swollman 52217096Swollmanextern struct pr_usrreqs tcp_usrreqs; 5239470Swollmanextern u_long tcp_sendspace; 5249470Swollmanextern u_long tcp_recvspace; 52592723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 5269470Swollman 52755205Speter#endif /* _KERNEL */ 5282169Spaul 5296348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 530