tcp_var.h revision 178349
1139823Simp/*- 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 * 4. Neither the name of the University nor the names of its contributors 141541Srgrimes * may be used to endorse or promote products derived from this software 151541Srgrimes * without specific prior written permission. 161541Srgrimes * 171541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271541Srgrimes * SUCH DAMAGE. 281541Srgrimes * 2910937Swollman * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 3050477Speter * $FreeBSD: head/sys/netinet/tcp_var.h 178349 2008-04-20 18:36:59Z bz $ 311541Srgrimes */ 321541Srgrimes 332169Spaul#ifndef _NETINET_TCP_VAR_H_ 342169Spaul#define _NETINET_TCP_VAR_H_ 3586764Sjlemon 3698102Shsu#include <netinet/tcp.h> 3786764Sjlemon 381541Srgrimes/* 391541Srgrimes * Kernel variables for tcp. 401541Srgrimes */ 4186764Sjlemonextern int tcp_do_rfc1323; 421541Srgrimes 4355679Sshin/* TCP segment queue entry */ 4455679Sshinstruct tseg_qent { 4560938Sjake LIST_ENTRY(tseg_qent) tqe_q; 4655679Sshin int tqe_len; /* TCP segment data length */ 4755679Sshin struct tcphdr *tqe_th; /* a pointer to tcp header */ 4855679Sshin struct mbuf *tqe_m; /* mbuf contains packet */ 4955679Sshin}; 5060938SjakeLIST_HEAD(tsegqe_head, tseg_qent); 51126193Sandreextern int tcp_reass_qsize; 52126225Sbdeextern struct uma_zone *tcp_reass_zone; 5355679Sshin 54130989Spsstruct sackblk { 55130989Sps tcp_seq start; /* start seq no. of sack block */ 56131078Sbms tcp_seq end; /* end seq no. */ 57130989Sps}; 58130989Sps 59130989Spsstruct sackhole { 60130989Sps tcp_seq start; /* start seq no. of hole */ 61130989Sps tcp_seq end; /* end seq no. */ 62130989Sps tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 63145370Sps TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 64130989Sps}; 65131078Sbms 66146123Spsstruct sackhint { 67146123Sps struct sackhole *nexthole; 68146123Sps int sack_bytes_rexmit; 69146123Sps}; 70146123Sps 7155679Sshinstruct tcptemp { 7255679Sshin u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 7355679Sshin struct tcphdr tt_t; 7455679Sshin}; 7555679Sshin 7655679Sshin#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 7755679Sshin 78169541Sandre/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 79169541Sandre#ifdef INET6 80169541Sandre#define ND6_HINT(tp) \ 81169541Sandredo { \ 82169541Sandre if ((tp) && (tp)->t_inpcb && \ 83169541Sandre ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 84169541Sandre nd6_nud_hint(NULL, NULL, 0); \ 85169541Sandre} while (0) 86169541Sandre#else 87169541Sandre#define ND6_HINT(tp) 88169541Sandre#endif 89169541Sandre 901541Srgrimes/* 911541Srgrimes * Tcp control block, one per tcp; fields: 9232821Sdg * Organized for 16 byte cacheline efficiency. 931541Srgrimes */ 941541Srgrimesstruct tcpcb { 95126193Sandre struct tsegqe_head t_segq; /* segment reassembly queue */ 96126193Sandre int t_segqlen; /* segment reassembly queue length */ 9732821Sdg int t_dupacks; /* consecutive dup acks recd */ 9832821Sdg 99172309Ssilby struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 10032821Sdg 10132821Sdg struct inpcb *t_inpcb; /* back pointer to internet pcb */ 10211187Swollman int t_state; /* state of this connection */ 10311187Swollman u_int t_flags; 104117650Shsu#define TF_ACKNOW 0x000001 /* ack peer immediately */ 105117650Shsu#define TF_DELACK 0x000002 /* ack, but try to delay it */ 106117650Shsu#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 107117650Shsu#define TF_NOOPT 0x000008 /* don't use tcp options */ 108117650Shsu#define TF_SENTFIN 0x000010 /* have sent FIN */ 109117650Shsu#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 110117650Shsu#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 111117650Shsu#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 112117650Shsu#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 113117650Shsu#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 114117650Shsu#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 115117650Shsu#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 116117650Shsu#define TF_NOPUSH 0x001000 /* don't push */ 117117650Shsu#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 118117650Shsu#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 119117650Shsu#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 120117650Shsu#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 121117650Shsu#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 122117650Shsu#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 123125680Sbms#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 124146463Sps#define TF_FORCEDATA 0x800000 /* force out a byte */ 125162084Sandre#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 126174556Skmacy#define TF_TOE 0x2000000 /* this connection is offloaded */ 1271541Srgrimes 1281541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 12932821Sdg tcp_seq snd_max; /* highest sequence number sent; 13032821Sdg * used to recognize retransmits 13132821Sdg */ 1321541Srgrimes tcp_seq snd_nxt; /* send next */ 1331541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 13432821Sdg 1351541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 1361541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 1371541Srgrimes tcp_seq iss; /* initial send sequence number */ 13832821Sdg tcp_seq irs; /* initial receive sequence number */ 13932821Sdg 14032821Sdg tcp_seq rcv_nxt; /* receive next */ 14132821Sdg tcp_seq rcv_adv; /* advertised window */ 1421541Srgrimes u_long rcv_wnd; /* receive window */ 1431541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 14432821Sdg 14532821Sdg u_long snd_wnd; /* send window */ 1461541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 147102017Sdillon u_long snd_bwnd; /* bandwidth-controlled window */ 14813765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 1491541Srgrimes * for slow start exponential to 1501541Srgrimes * linear switch 1511541Srgrimes */ 152102017Sdillon u_long snd_bandwidth; /* calculated bandwidth or 0 */ 153109175Shsu tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 15460067Sjlemon 15532821Sdg u_int t_maxopd; /* mss plus options */ 15632821Sdg 15750673Sjlemon u_long t_rcvtime; /* inactivity time */ 15850673Sjlemon u_long t_starttime; /* time connection was established */ 15950673Sjlemon int t_rtttime; /* round trip time */ 1601541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 16132821Sdg 162102017Sdillon int t_bw_rtttime; /* used for bandwidth calculation */ 163102017Sdillon tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 164102017Sdillon 16550673Sjlemon int t_rxtcur; /* current retransmit value (ticks) */ 16632821Sdg u_int t_maxseg; /* maximum segment size */ 16711187Swollman int t_srtt; /* smoothed round-trip time */ 16811187Swollman int t_rttvar; /* variance in round-trip time */ 16932821Sdg 17032821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 17111187Swollman u_int t_rttmin; /* minimum rtt allowed */ 172102017Sdillon u_int t_rttbest; /* best rtt we've seen */ 17332821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1741541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1751541Srgrimes 17632821Sdg int t_softerror; /* possible error not yet reported */ 1771541Srgrimes/* out-of-band data */ 1781541Srgrimes char t_oobflags; /* have some */ 1791541Srgrimes char t_iobc; /* input character */ 1801541Srgrimes#define TCPOOB_HAVEDATA 0x01 1811541Srgrimes#define TCPOOB_HADDATA 0x02 1821541Srgrimes/* RFC 1323 variables */ 1831541Srgrimes u_char snd_scale; /* window scaling for send window */ 1841541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1851541Srgrimes u_char request_r_scale; /* pending window scaling */ 186162277Sandre u_int32_t ts_recent; /* timestamp echo data */ 187162277Sandre u_long ts_recent_age; /* when last updated */ 188162277Sandre u_int32_t ts_offset; /* our timestamp offset */ 18932821Sdg 1901541Srgrimes tcp_seq last_ack_sent; 19150673Sjlemon/* experimental */ 19250673Sjlemon u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 19350673Sjlemon u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 194117650Shsu tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 19550673Sjlemon u_long t_badrxtwin; /* window for retransmit recovery */ 196112957Shsu u_char snd_limited; /* segments limited transmitted */ 197131078Sbms/* SACK related state */ 198130989Sps int snd_numholes; /* number of holes seen by sender */ 199146953Sps TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 200146953Sps /* SACK scoreboard (sorted) */ 201146630Sps tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 202130989Sps int rcv_numsacks; /* # distinct sack blks present */ 203130989Sps struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 204136151Sps tcp_seq sack_newdata; /* New data xmitted in this recovery 205136151Sps episode starts at this seq number */ 206146123Sps struct sackhint sackhint; /* SACK scoreboard hint */ 207155767Sandre int t_rttlow; /* smallest observerved RTT */ 208166405Sandre u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 209166405Sandre int rfbuf_cnt; /* recv buffer autoscaling byte count */ 210174556Skmacy void *t_pspare[3]; /* toe usrreqs / toepcb * / congestion algo / vimage / 1 general use */ 211174556Skmacy struct toe_usrreqs *t_tu; /* offload operations vector */ 212174560Skmacy void *t_toe; /* TOE pcb pointer */ 2131541Srgrimes}; 2141541Srgrimes 215117650Shsu#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 216117650Shsu#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 217117650Shsu#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 218117650Shsu 219125680Sbms#ifdef TCP_SIGNATURE 2206247Swollman/* 221125680Sbms * Defines which are needed by the xform_tcp module and tcp_[in|out]put 222125680Sbms * for SADB verification and lookup. 223125680Sbms */ 224125680Sbms#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 225125680Sbms#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 226125680Sbms#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 227125680Sbms/* 228125680Sbms * Only a single SA per host may be specified at this time. An SPI is 229125680Sbms * needed in order for the KEY_ALLOCSA() lookup to work. 230125680Sbms */ 231125680Sbms#define TCP_SIG_SPI 0x1000 232125680Sbms#endif /* TCP_SIGNATURE */ 233125680Sbms 234125680Sbms/* 2356247Swollman * Structure to hold TCP options that are only used during segment 2366247Swollman * processing (in tcp_input), but not held in the tcpcb. 2376247Swollman * It's basically used to reduce the number of parameters 238167606Sandre * to tcp_dooptions and tcp_addoptions. 239167606Sandre * The binary order of the to_flags is relevant for packing of the 240167606Sandre * options in tcp_addoptions. 2416247Swollman */ 2426247Swollmanstruct tcpopt { 24386764Sjlemon u_long to_flags; /* which options are present */ 244167606Sandre#define TOF_MSS 0x0001 /* maximum segment size */ 245167606Sandre#define TOF_SCALE 0x0002 /* window scaling */ 246178349Sbz#define TOF_SACKPERM 0x0004 /* SACK permitted */ 247167606Sandre#define TOF_TS 0x0010 /* timestamp */ 248178349Sbz#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 249168906Sandre#define TOF_SACK 0x0080 /* Peer sent SACK option */ 250168906Sandre#define TOF_MAXOPT 0x0100 251168906Sandre u_int32_t to_tsval; /* new timestamp */ 252167606Sandre u_int32_t to_tsecr; /* reflected timestamp */ 253167606Sandre u_int16_t to_mss; /* maximum segment size */ 254167606Sandre u_int8_t to_wscale; /* window scaling */ 255147637Sps u_int8_t to_nsacks; /* number of SACK blocks */ 256147637Sps u_char *to_sacks; /* pointer to the first SACK blocks */ 257168906Sandre u_char *to_signature; /* pointer to the TCP-MD5 signature */ 2586247Swollman}; 2596247Swollman 260159949Sandre/* 261159949Sandre * Flags for tcp_dooptions. 262159949Sandre */ 263159949Sandre#define TO_SYN 0x01 /* parse SYN-only options */ 264159949Sandre 265122922Sandrestruct hc_metrics_lite { /* must stay in sync with hc_metrics */ 266122922Sandre u_long rmx_mtu; /* MTU for this path */ 267122922Sandre u_long rmx_ssthresh; /* outbound gateway buffer limit */ 268122922Sandre u_long rmx_rtt; /* estimated round trip time */ 269122922Sandre u_long rmx_rttvar; /* estimated rtt variance */ 270122922Sandre u_long rmx_bandwidth; /* estimated bandwidth */ 271122922Sandre u_long rmx_cwnd; /* congestion window */ 272122922Sandre u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 273122922Sandre u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 274122922Sandre}; 275122922Sandre 276159725Sandre#ifndef _NETINET_IN_PCB_H_ 277159725Sandrestruct in_conninfo; 278159725Sandre#endif /* _NETINET_IN_PCB_H_ */ 279159725Sandre 280111145Sjlemonstruct tcptw { 281111145Sjlemon struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 282111145Sjlemon tcp_seq snd_nxt; 283111145Sjlemon tcp_seq rcv_nxt; 284121850Ssilby tcp_seq iss; 285121884Ssilby tcp_seq irs; 286111145Sjlemon u_short last_win; /* cached window value */ 287111145Sjlemon u_short tw_so_options; /* copy of so_options */ 288111145Sjlemon struct ucred *tw_cred; /* user credentials */ 289133874Srwatson u_long t_recent; 290169477Sandre u_int32_t ts_offset; /* our timestamp offset */ 291111145Sjlemon u_long t_starttime; 292112009Sjlemon int tw_time; 293162111Sru TAILQ_ENTRY(tcptw) tw_2msl; 294111145Sjlemon}; 295133874Srwatson 2961541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 297111145Sjlemon#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 2981541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 2991541Srgrimes 3001541Srgrimes/* 3011541Srgrimes * The smoothed round-trip time and estimated variance 3021541Srgrimes * are stored as fixed point numbers scaled by the values below. 3031541Srgrimes * For convenience, these scales are also used in smoothing the average 3041541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 3051541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 3061541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 3071541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 3081541Srgrimes */ 30914753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 31014753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 31114753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 31214753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 31314753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 3141541Srgrimes 3151541Srgrimes/* 3161541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 3171541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 3181541Srgrimes * will each average +1/2 tick of bias. When we compute 3191541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 3201541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 3211541Srgrimes * firing of the timer. The bias will give us exactly the 3221541Srgrimes * 1.5 tick we need. But, because the bias is 3231541Srgrimes * statistical, we have to test that we don't drop below 3241541Srgrimes * the minimum feasible timer (which is 2 ticks). 32514753Swollman * This version of the macro adapted from a paper by Lawrence 32614753Swollman * Brakmo and Larry Peterson which outlines a problem caused 32714753Swollman * by insufficient precision in the original implementation, 32814753Swollman * which results in inappropriately large RTO values for very 32914753Swollman * fast networks. 3301541Srgrimes */ 3311541Srgrimes#define TCP_REXMTVAL(tp) \ 33235419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 33316141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 3341541Srgrimes 3351541Srgrimes/* 3361541Srgrimes * TCP statistics. 3371541Srgrimes * Many of these should be kept per connection, 3381541Srgrimes * but that's inconvenient at the moment. 3391541Srgrimes */ 3401541Srgrimesstruct tcpstat { 3411541Srgrimes u_long tcps_connattempt; /* connections initiated */ 3421541Srgrimes u_long tcps_accepts; /* connections accepted */ 3431541Srgrimes u_long tcps_connects; /* connections established */ 3441541Srgrimes u_long tcps_drops; /* connections dropped */ 3451541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 346124258Sandre u_long tcps_minmssdrops; /* average minmss too low drops */ 3471541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 3481541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 3491541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 3501541Srgrimes u_long tcps_delack; /* delayed acks sent */ 3511541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 3521541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 3531541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 3541541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 3551541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 3561541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 3571541Srgrimes 3581541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 3591541Srgrimes u_long tcps_sndpack; /* data packets sent */ 3601541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 3611541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 3621541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 363100373Sdillon u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 3641541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 3651541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 3661541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 3671541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 3681541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 3691541Srgrimes 3701541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 3711541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 3721541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 3731541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 3741541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 37552904Sshin u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 3761541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 3771541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 3781541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 3791541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 3801541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 3811541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 3821541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 3831541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 3841541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 3851541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 3861541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 3871541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 3881541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 3891541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 3901541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 3911541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 3921541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 3931541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 3941541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 3951541Srgrimes u_long tcps_pcbcachemiss; 3969263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 3979263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 3989263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 3999470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 4009470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 4019470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 40210937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 40310937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 40411415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 40514281Sbde u_long tcps_listendrop; /* listen queue overflows */ 406128653Ssilby u_long tcps_badrst; /* ignored RSTs in the window */ 40786764Sjlemon 40886764Sjlemon u_long tcps_sc_added; /* entry added to syncache */ 40986764Sjlemon u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 41086764Sjlemon u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 41186764Sjlemon u_long tcps_sc_dropped; /* could not reply to packet */ 41286764Sjlemon u_long tcps_sc_completed; /* successful extraction of entry */ 41386764Sjlemon u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 41486764Sjlemon u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 41586764Sjlemon u_long tcps_sc_reset; /* RST removed entry from syncache */ 41686764Sjlemon u_long tcps_sc_stale; /* timed out or listen socket gone */ 41786764Sjlemon u_long tcps_sc_aborted; /* syncache entry aborted */ 41886764Sjlemon u_long tcps_sc_badack; /* removed due to bad ACK */ 41986764Sjlemon u_long tcps_sc_unreach; /* ICMP unreachable received */ 42086764Sjlemon u_long tcps_sc_zonefail; /* zalloc() failed */ 42186764Sjlemon u_long tcps_sc_sendcookie; /* SYN cookie sent */ 42286764Sjlemon u_long tcps_sc_recvcookie; /* SYN cookie received */ 423122922Sandre 424122922Sandre u_long tcps_hc_added; /* entry added to hostcache */ 425122922Sandre u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 426130989Sps 427167036Smohans u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 428167036Smohans 429130989Sps /* SACK related stats */ 430130989Sps u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 431130989Sps u_long tcps_sack_rexmits; /* SACK rexmit segments */ 432133874Srwatson u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 433130989Sps u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 434130989Sps u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 435143339Sps u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 4361541Srgrimes}; 4371541Srgrimes 4386247Swollman/* 43936079Swollman * TCB structure exported to user-land via sysctl(3). 44037183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 44137183Sjhay * included. Not all of our clients do. 44236079Swollman */ 44337183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 44436079Swollmanstruct xtcpcb { 44536079Swollman size_t xt_len; 44636079Swollman struct inpcb xt_inp; 44736079Swollman struct tcpcb xt_tp; 44836079Swollman struct xsocket xt_socket; 44936079Swollman u_quad_t xt_alignment_hack; 45036079Swollman}; 45136079Swollman#endif 45236079Swollman 45336079Swollman/* 4546247Swollman * Names for TCP sysctl objects 4556247Swollman */ 4566247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 4576247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 4586472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 4596472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 4606472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 4616472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 46218281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 46318281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 46463431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 46536079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 46650673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 46752904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 468130989Sps#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 469141381Smaxim#define TCPCTL_DROP 15 /* drop tcp connection */ 470141381Smaxim#define TCPCTL_MAXID 16 471167036Smohans#define TCPCTL_FINWAIT2_TIMEOUT 17 4726247Swollman 4736247Swollman#define TCPCTL_NAMES { \ 4746247Swollman { 0, 0 }, \ 4756348Swollman { "rfc1323", CTLTYPE_INT }, \ 4766247Swollman { "mssdflt", CTLTYPE_INT }, \ 4776472Swollman { "stats", CTLTYPE_STRUCT }, \ 4786472Swollman { "rttdflt", CTLTYPE_INT }, \ 4796472Swollman { "keepidle", CTLTYPE_INT }, \ 4806472Swollman { "keepintvl", CTLTYPE_INT }, \ 4816472Swollman { "sendspace", CTLTYPE_INT }, \ 4826472Swollman { "recvspace", CTLTYPE_INT }, \ 48318281Spst { "keepinit", CTLTYPE_INT }, \ 48436079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 48550673Sjlemon { "delacktime", CTLTYPE_INT }, \ 48652904Sshin { "v6mssdflt", CTLTYPE_INT }, \ 487122922Sandre { "maxid", CTLTYPE_INT }, \ 4886247Swollman} 4896247Swollman 49044078Sdfr 49155205Speter#ifdef _KERNEL 49244078Sdfr#ifdef SYSCTL_DECL 49344078SdfrSYSCTL_DECL(_net_inet_tcp); 494136151SpsSYSCTL_DECL(_net_inet_tcp_sack); 495169683SandreMALLOC_DECLARE(M_TCPLOG); 49644078Sdfr#endif 49744078Sdfr 4987684Sdgextern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 4997684Sdgextern struct inpcbinfo tcbinfo; 5006348Swollmanextern struct tcpstat tcpstat; /* tcp statistics */ 501171640Sandreextern int tcp_log_in_vain; 5027090Sbdeextern int tcp_mssdflt; /* XXX */ 503124258Sandreextern int tcp_minmss; 50433846Sdgextern int tcp_delack_enabled; 50560067Sjlemonextern int tcp_do_newreno; 50698204Ssilbyextern int path_mtu_discovery; 50750673Sjlemonextern int ss_fltsz; 50850673Sjlemonextern int ss_fltsz_local; 5091541Srgrimes 510170055Sandreextern int tcp_do_sack; /* SACK enabled/disabled */ 511170055Sandreextern int tcp_sc_rst_sock_fail; /* RST on sock alloc failure */ 512130989Sps 513167606Sandreint tcp_addoptions(struct tcpopt *, u_char *); 5141541Srgrimesstruct tcpcb * 51592723Salfred tcp_close(struct tcpcb *); 516157376Srwatsonvoid tcp_discardcb(struct tcpcb *); 517111145Sjlemonvoid tcp_twstart(struct tcpcb *); 518162064Sglebius#if 0 519121850Ssilbyint tcp_twrecycleable(struct tcptw *tw); 520162064Sglebius#endif 521157376Srwatsonvoid tcp_twclose(struct tcptw *_tw, int _reuse); 52292723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 52392723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 5241541Srgrimesstruct tcpcb * 52592723Salfred tcp_drop(struct tcpcb *, int); 52692723Salfredvoid tcp_drain(void); 52792723Salfredvoid tcp_fasttimo(void); 52892723Salfredvoid tcp_init(void); 529128452Ssilbyvoid tcp_fini(void *); 530169683Sandrechar *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 531171229Speter const void *); 532169541Sandreint tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 533126193Sandrevoid tcp_reass_init(void); 53492723Salfredvoid tcp_input(struct mbuf *, int); 535162084Sandreu_long tcp_maxmtu(struct in_conninfo *, int *); 536162084Sandreu_long tcp_maxmtu6(struct in_conninfo *, int *); 53792723Salfredvoid tcp_mss(struct tcpcb *, int); 538122922Sandreint tcp_mssopt(struct in_conninfo *); 539133874Srwatsonstruct inpcb * 54098211Shsu tcp_drop_syn_sent(struct inpcb *, int); 54198211Shsustruct inpcb * 54298211Shsu tcp_mtudisc(struct inpcb *, int); 5431541Srgrimesstruct tcpcb * 54492723Salfred tcp_newtcpcb(struct inpcb *); 54592723Salfredint tcp_output(struct tcpcb *); 54692723Salfredvoid tcp_respond(struct tcpcb *, void *, 54792723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 548169541Sandrevoid tcp_tw_init(void); 549169541Sandrevoid tcp_tw_zone_change(void); 550169608Sandreint tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 551169608Sandre struct mbuf *, int); 552126351Srwatsonint tcp_twrespond(struct tcptw *, int); 55392723Salfredvoid tcp_setpersist(struct tcpcb *); 554125783Sbms#ifdef TCP_SIGNATURE 555125783Sbmsint tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 556125783Sbms#endif 55792723Salfredvoid tcp_slowtimo(void); 55855679Sshinstruct tcptemp * 559111144Sjlemon tcpip_maketemplate(struct inpcb *); 560111144Sjlemonvoid tcpip_fillheaders(struct inpcb *, void *, void *); 561168615Sandrevoid tcp_timer_activate(struct tcpcb *, int, u_int); 562168615Sandreint tcp_timer_active(struct tcpcb *, int); 563169272Srwatsonvoid tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 564102017Sdillonvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 565122922Sandre/* 566122922Sandre * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 567122922Sandre */ 568122922Sandrevoid tcp_hc_init(void); 569122922Sandrevoid tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 570122922Sandreu_long tcp_hc_getmtu(struct in_conninfo *); 571122922Sandrevoid tcp_hc_updatemtu(struct in_conninfo *, u_long); 572122922Sandrevoid tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 5739470Swollman 57417096Swollmanextern struct pr_usrreqs tcp_usrreqs; 5759470Swollmanextern u_long tcp_sendspace; 5769470Swollmanextern u_long tcp_recvspace; 57792723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 5789470Swollman 579147637Spsvoid tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 580142031Spsvoid tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 581130989Spsvoid tcp_clean_sackreport(struct tcpcb *tp); 582130989Spsvoid tcp_sack_adjust(struct tcpcb *tp); 583136151Spsstruct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 584130989Spsvoid tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 585130989Spsvoid tcp_free_sackholes(struct tcpcb *tp); 586130989Spsint tcp_newreno(struct tcpcb *, struct tcphdr *); 587130989Spsu_long tcp_seq_subtract(u_long, u_long ); 588130989Sps 58955205Speter#endif /* _KERNEL */ 5902169Spaul 5916348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 592