tcp_var.h revision 122922
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 122922 2003-11-20 20:07:39Z andre $ 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 u_int32_t sc_tsrecent; 21786764Sjlemon tcp_cc sc_cc_send; /* holds CC or CCnew */ 21886764Sjlemon tcp_cc sc_cc_recv; 21986764Sjlemon tcp_seq sc_irs; /* seq from peer */ 22086764Sjlemon tcp_seq sc_iss; /* our ISS */ 22186764Sjlemon u_long sc_rxttime; /* retransmit time */ 22286764Sjlemon u_int16_t sc_rxtslot; /* retransmit counter */ 22386764Sjlemon u_int16_t sc_peer_mss; /* peer's MSS */ 22486764Sjlemon u_int16_t sc_wnd; /* advertised window */ 22586764Sjlemon u_int8_t sc_requested_s_scale:4, 22686764Sjlemon sc_request_r_scale:4; 22786764Sjlemon u_int8_t sc_flags; 22886764Sjlemon#define SCF_NOOPT 0x01 /* no TCP options */ 22986764Sjlemon#define SCF_WINSCALE 0x02 /* negotiated window scaling */ 23086764Sjlemon#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 23186764Sjlemon#define SCF_CC 0x08 /* negotiated CC */ 23286764Sjlemon#define SCF_UNREACH 0x10 /* icmp unreachable received */ 23386764Sjlemon TAILQ_ENTRY(syncache) sc_hash; 23486764Sjlemon TAILQ_ENTRY(syncache) sc_timerq; 23586764Sjlemon}; 23686764Sjlemon 23786764Sjlemonstruct syncache_head { 23886764Sjlemon TAILQ_HEAD(, syncache) sch_bucket; 23986764Sjlemon u_int sch_length; 24086764Sjlemon}; 241111145Sjlemon 242122922Sandrestruct hc_metrics_lite { /* must stay in sync with hc_metrics */ 243122922Sandre u_long rmx_mtu; /* MTU for this path */ 244122922Sandre u_long rmx_ssthresh; /* outbound gateway buffer limit */ 245122922Sandre u_long rmx_rtt; /* estimated round trip time */ 246122922Sandre u_long rmx_rttvar; /* estimated rtt variance */ 247122922Sandre u_long rmx_bandwidth; /* estimated bandwidth */ 248122922Sandre u_long rmx_cwnd; /* congestion window */ 249122922Sandre u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 250122922Sandre u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 251122922Sandre}; 252122922Sandre 253111145Sjlemonstruct tcptw { 254111145Sjlemon struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 255111145Sjlemon tcp_seq snd_nxt; 256111145Sjlemon tcp_seq rcv_nxt; 257121850Ssilby tcp_seq iss; 258121884Ssilby tcp_seq irs; 259111145Sjlemon tcp_cc cc_recv; 260111145Sjlemon tcp_cc cc_send; 261111145Sjlemon u_short last_win; /* cached window value */ 262111145Sjlemon u_short tw_so_options; /* copy of so_options */ 263111145Sjlemon struct ucred *tw_cred; /* user credentials */ 264111145Sjlemon u_long t_recent; 265111145Sjlemon u_long t_starttime; 266112009Sjlemon int tw_time; 267112009Sjlemon LIST_ENTRY(tcptw) tw_2msl; 268111145Sjlemon}; 26986764Sjlemon 2706247Swollman/* 271122922Sandre * The TAO cache entry which is stored in the tcp hostcache. 2726247Swollman */ 2736247Swollmanstruct rmxp_tao { 2746247Swollman tcp_cc tao_cc; /* latest CC in valid SYN */ 2756247Swollman tcp_cc tao_ccsent; /* latest CC sent to peer */ 2766247Swollman u_short tao_mssopt; /* peer's cached MSS */ 2776247Swollman#ifdef notyet 2786247Swollman u_short tao_flags; /* cache status flags */ 2796247Swollman#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 2806247Swollman#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 2816247Swollman#define TAOF_UNDEF 0 /* we don't know yet */ 2826247Swollman#endif /* notyet */ 2836247Swollman}; 2846247Swollman 2851541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 286111145Sjlemon#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 2871541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 2881541Srgrimes 2891541Srgrimes/* 2901541Srgrimes * The smoothed round-trip time and estimated variance 2911541Srgrimes * are stored as fixed point numbers scaled by the values below. 2921541Srgrimes * For convenience, these scales are also used in smoothing the average 2931541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 2941541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 2951541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 2961541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 2971541Srgrimes */ 29814753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 29914753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 30014753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 30114753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 30214753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 3031541Srgrimes 3041541Srgrimes/* 3051541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 3061541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 3071541Srgrimes * will each average +1/2 tick of bias. When we compute 3081541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 3091541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 3101541Srgrimes * firing of the timer. The bias will give us exactly the 3111541Srgrimes * 1.5 tick we need. But, because the bias is 3121541Srgrimes * statistical, we have to test that we don't drop below 3131541Srgrimes * the minimum feasible timer (which is 2 ticks). 31414753Swollman * This version of the macro adapted from a paper by Lawrence 31514753Swollman * Brakmo and Larry Peterson which outlines a problem caused 31614753Swollman * by insufficient precision in the original implementation, 31714753Swollman * which results in inappropriately large RTO values for very 31814753Swollman * fast networks. 3191541Srgrimes */ 3201541Srgrimes#define TCP_REXMTVAL(tp) \ 32135419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 32216141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 3231541Srgrimes 3241541Srgrimes/* 3251541Srgrimes * TCP statistics. 3261541Srgrimes * Many of these should be kept per connection, 3271541Srgrimes * but that's inconvenient at the moment. 3281541Srgrimes */ 3291541Srgrimesstruct tcpstat { 3301541Srgrimes u_long tcps_connattempt; /* connections initiated */ 3311541Srgrimes u_long tcps_accepts; /* connections accepted */ 3321541Srgrimes u_long tcps_connects; /* connections established */ 3331541Srgrimes u_long tcps_drops; /* connections dropped */ 3341541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 3351541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 3361541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 3371541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 3381541Srgrimes u_long tcps_delack; /* delayed acks sent */ 3391541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 3401541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 3411541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 3421541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 3431541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 3441541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 3451541Srgrimes 3461541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 3471541Srgrimes u_long tcps_sndpack; /* data packets sent */ 3481541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 3491541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 3501541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 351100373Sdillon u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 3521541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 3531541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 3541541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 3551541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 3561541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 3571541Srgrimes 3581541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 3591541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 3601541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 3611541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 3621541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 36352904Sshin u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 3641541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 3651541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 3661541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 3671541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 3681541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 3691541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 3701541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 3711541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 3721541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 3731541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 3741541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 3751541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 3761541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 3771541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 3781541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 3791541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 3801541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 3811541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 3821541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 3831541Srgrimes u_long tcps_pcbcachemiss; 3849263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 3859263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 3869263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 3879470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 3889470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 3899470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 39010937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 39110937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 39211415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 39314281Sbde u_long tcps_listendrop; /* listen queue overflows */ 39486764Sjlemon 39586764Sjlemon u_long tcps_sc_added; /* entry added to syncache */ 39686764Sjlemon u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 39786764Sjlemon u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 39886764Sjlemon u_long tcps_sc_dropped; /* could not reply to packet */ 39986764Sjlemon u_long tcps_sc_completed; /* successful extraction of entry */ 40086764Sjlemon u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 40186764Sjlemon u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 40286764Sjlemon u_long tcps_sc_reset; /* RST removed entry from syncache */ 40386764Sjlemon u_long tcps_sc_stale; /* timed out or listen socket gone */ 40486764Sjlemon u_long tcps_sc_aborted; /* syncache entry aborted */ 40586764Sjlemon u_long tcps_sc_badack; /* removed due to bad ACK */ 40686764Sjlemon u_long tcps_sc_unreach; /* ICMP unreachable received */ 40786764Sjlemon u_long tcps_sc_zonefail; /* zalloc() failed */ 40886764Sjlemon u_long tcps_sc_sendcookie; /* SYN cookie sent */ 40986764Sjlemon u_long tcps_sc_recvcookie; /* SYN cookie received */ 410122922Sandre 411122922Sandre u_long tcps_hc_added; /* entry added to hostcache */ 412122922Sandre u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 4131541Srgrimes}; 4141541Srgrimes 4156247Swollman/* 41636079Swollman * TCB structure exported to user-land via sysctl(3). 41737183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 41837183Sjhay * included. Not all of our clients do. 41936079Swollman */ 42037183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 42136079Swollmanstruct xtcpcb { 42236079Swollman size_t xt_len; 42336079Swollman struct inpcb xt_inp; 42436079Swollman struct tcpcb xt_tp; 42536079Swollman struct xsocket xt_socket; 42636079Swollman u_quad_t xt_alignment_hack; 42736079Swollman}; 42836079Swollman#endif 42936079Swollman 43036079Swollman/* 4316247Swollman * Names for TCP sysctl objects 4326247Swollman */ 4336247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 4346247Swollman#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 4356247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 4366472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 4376472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 4386472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 4396472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 44018281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 44118281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 44263431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 44336079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 44450673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 44552904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 44652904Sshin#define TCPCTL_MAXID 14 4476247Swollman 4486247Swollman#define TCPCTL_NAMES { \ 4496247Swollman { 0, 0 }, \ 4506348Swollman { "rfc1323", CTLTYPE_INT }, \ 4516348Swollman { "rfc1644", CTLTYPE_INT }, \ 4526247Swollman { "mssdflt", CTLTYPE_INT }, \ 4536472Swollman { "stats", CTLTYPE_STRUCT }, \ 4546472Swollman { "rttdflt", CTLTYPE_INT }, \ 4556472Swollman { "keepidle", CTLTYPE_INT }, \ 4566472Swollman { "keepintvl", CTLTYPE_INT }, \ 4576472Swollman { "sendspace", CTLTYPE_INT }, \ 4586472Swollman { "recvspace", CTLTYPE_INT }, \ 45918281Spst { "keepinit", CTLTYPE_INT }, \ 46036079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 46150673Sjlemon { "delacktime", CTLTYPE_INT }, \ 46252904Sshin { "v6mssdflt", CTLTYPE_INT }, \ 463122922Sandre { "maxid", CTLTYPE_INT }, \ 4646247Swollman} 4656247Swollman 46644078Sdfr 46755205Speter#ifdef _KERNEL 46844078Sdfr#ifdef SYSCTL_DECL 46944078SdfrSYSCTL_DECL(_net_inet_tcp); 47044078Sdfr#endif 47144078Sdfr 4727684Sdgextern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 4737684Sdgextern struct inpcbinfo tcbinfo; 4746348Swollmanextern struct tcpstat tcpstat; /* tcp statistics */ 4757090Sbdeextern int tcp_mssdflt; /* XXX */ 47633846Sdgextern int tcp_delack_enabled; 47760067Sjlemonextern int tcp_do_newreno; 47898204Ssilbyextern int path_mtu_discovery; 47950673Sjlemonextern int ss_fltsz; 48050673Sjlemonextern int ss_fltsz_local; 4811541Srgrimes 48292723Salfredvoid tcp_canceltimers(struct tcpcb *); 4831541Srgrimesstruct tcpcb * 48492723Salfred tcp_close(struct tcpcb *); 485111145Sjlemonvoid tcp_twstart(struct tcpcb *); 486121850Ssilbyint tcp_twrecycleable(struct tcptw *tw); 487112009Sjlemonstruct tcptw * 488112009Sjlemon tcp_twclose(struct tcptw *_tw, int _reuse); 48992723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 49092723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 4911541Srgrimesstruct tcpcb * 49292723Salfred tcp_drop(struct tcpcb *, int); 49392723Salfredvoid tcp_drain(void); 49492723Salfredvoid tcp_fasttimo(void); 49592723Salfredvoid tcp_init(void); 49692723Salfredvoid tcp_input(struct mbuf *, int); 497122922Sandreu_long tcp_maxmtu(struct in_conninfo *); 498122922Sandreu_long tcp_maxmtu6(struct in_conninfo *); 49992723Salfredvoid tcp_mss(struct tcpcb *, int); 500122922Sandreint tcp_mssopt(struct in_conninfo *); 50198211Shsustruct inpcb * 50298211Shsu tcp_drop_syn_sent(struct inpcb *, int); 50398211Shsustruct inpcb * 50498211Shsu tcp_mtudisc(struct inpcb *, int); 5051541Srgrimesstruct tcpcb * 50692723Salfred tcp_newtcpcb(struct inpcb *); 50792723Salfredint tcp_output(struct tcpcb *); 50898211Shsustruct inpcb * 50998211Shsu tcp_quench(struct inpcb *, int); 51092723Salfredvoid tcp_respond(struct tcpcb *, void *, 51192723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 512114794Srwatsonint tcp_twrespond(struct tcptw *, struct socket *, struct mbuf *, int); 51392723Salfredvoid tcp_setpersist(struct tcpcb *); 51492723Salfredvoid tcp_slowtimo(void); 51555679Sshinstruct tcptemp * 516111144Sjlemon tcpip_maketemplate(struct inpcb *); 517111144Sjlemonvoid tcpip_fillheaders(struct inpcb *, void *, void *); 5181541Srgrimesstruct tcpcb * 51992723Salfred tcp_timers(struct tcpcb *, int); 52092723Salfredvoid tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 521102017Sdillonvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 52286764Sjlemonvoid syncache_init(void); 52386764Sjlemonvoid syncache_unreach(struct in_conninfo *, struct tcphdr *); 52486764Sjlemonint syncache_expand(struct in_conninfo *, struct tcphdr *, 52586764Sjlemon struct socket **, struct mbuf *); 52686764Sjlemonint syncache_add(struct in_conninfo *, struct tcpopt *, 52786764Sjlemon struct tcphdr *, struct socket **, struct mbuf *); 52886764Sjlemonvoid syncache_chkrst(struct in_conninfo *, struct tcphdr *); 52986764Sjlemonvoid syncache_badack(struct in_conninfo *); 530122922Sandre/* 531122922Sandre * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 532122922Sandre */ 533122922Sandrevoid tcp_hc_init(void); 534122922Sandrevoid tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 535122922Sandreu_long tcp_hc_getmtu(struct in_conninfo *); 536122922Sandrevoid tcp_hc_gettao(struct in_conninfo *, struct rmxp_tao *); 537122922Sandrevoid tcp_hc_updatemtu(struct in_conninfo *, u_long); 538122922Sandrevoid tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 539122922Sandrevoid tcp_hc_updatetao(struct in_conninfo *, int, tcp_cc, u_short); 540122922Sandre/* update which tao field */ 541122922Sandre#define TCP_HC_TAO_CC 0x1 542122922Sandre#define TCP_HC_TAO_CCSENT 0x2 543122922Sandre#define TCP_HC_TAO_MSSOPT 0x3 5449470Swollman 54517096Swollmanextern struct pr_usrreqs tcp_usrreqs; 5469470Swollmanextern u_long tcp_sendspace; 5479470Swollmanextern u_long tcp_recvspace; 54892723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 5499470Swollman 55055205Speter#endif /* _KERNEL */ 5512169Spaul 5526348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 553