tcp_var.h revision 211464
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 211464 2010-08-18 18:05:54Z andre $ 311541Srgrimes */ 321541Srgrimes 332169Spaul#ifndef _NETINET_TCP_VAR_H_ 342169Spaul#define _NETINET_TCP_VAR_H_ 3586764Sjlemon 3698102Shsu#include <netinet/tcp.h> 3786764Sjlemon 38195699Srwatson#ifdef _KERNEL 39195699Srwatson#include <net/vnet.h> 40191688Szec 411541Srgrimes/* 421541Srgrimes * Kernel variables for tcp. 431541Srgrimes */ 44195699SrwatsonVNET_DECLARE(int, tcp_do_rfc1323); 45207369Sbz#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 46207369Sbz 47195699SrwatsonVNET_DECLARE(int, tcp_reass_qsize); 48195699SrwatsonVNET_DECLARE(struct uma_zone *, tcp_reass_zone); 49195727Srwatson#define V_tcp_reass_qsize VNET(tcp_reass_qsize) 50195727Srwatson#define V_tcp_reass_zone VNET(tcp_reass_zone) 51195699Srwatson#endif /* _KERNEL */ 52195699Srwatson 5355679Sshin/* TCP segment queue entry */ 5455679Sshinstruct tseg_qent { 5560938Sjake LIST_ENTRY(tseg_qent) tqe_q; 5655679Sshin int tqe_len; /* TCP segment data length */ 5755679Sshin struct tcphdr *tqe_th; /* a pointer to tcp header */ 5855679Sshin struct mbuf *tqe_m; /* mbuf contains packet */ 5955679Sshin}; 6060938SjakeLIST_HEAD(tsegqe_head, tseg_qent); 6155679Sshin 62130989Spsstruct sackblk { 63130989Sps tcp_seq start; /* start seq no. of sack block */ 64131078Sbms tcp_seq end; /* end seq no. */ 65130989Sps}; 66130989Sps 67130989Spsstruct sackhole { 68130989Sps tcp_seq start; /* start seq no. of hole */ 69130989Sps tcp_seq end; /* end seq no. */ 70130989Sps tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 71145370Sps TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 72130989Sps}; 73131078Sbms 74146123Spsstruct sackhint { 75146123Sps struct sackhole *nexthole; 76146123Sps int sack_bytes_rexmit; 77195634Slstewart 78195634Slstewart int ispare; /* explicit pad for 64bit alignment */ 79195634Slstewart uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 80146123Sps}; 81146123Sps 8255679Sshinstruct tcptemp { 8355679Sshin u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 8455679Sshin struct tcphdr tt_t; 8555679Sshin}; 8655679Sshin 8755679Sshin#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 8855679Sshin 89169541Sandre/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 90169541Sandre#ifdef INET6 91169541Sandre#define ND6_HINT(tp) \ 92169541Sandredo { \ 93169541Sandre if ((tp) && (tp)->t_inpcb && \ 94169541Sandre ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 95169541Sandre nd6_nud_hint(NULL, NULL, 0); \ 96169541Sandre} while (0) 97169541Sandre#else 98169541Sandre#define ND6_HINT(tp) 99169541Sandre#endif 100169541Sandre 1011541Srgrimes/* 1021541Srgrimes * Tcp control block, one per tcp; fields: 10332821Sdg * Organized for 16 byte cacheline efficiency. 1041541Srgrimes */ 1051541Srgrimesstruct tcpcb { 106126193Sandre struct tsegqe_head t_segq; /* segment reassembly queue */ 107195634Slstewart void *t_pspare[2]; /* new reassembly queue */ 108126193Sandre int t_segqlen; /* segment reassembly queue length */ 10932821Sdg int t_dupacks; /* consecutive dup acks recd */ 11032821Sdg 111172309Ssilby struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 11232821Sdg 11332821Sdg struct inpcb *t_inpcb; /* back pointer to internet pcb */ 11411187Swollman int t_state; /* state of this connection */ 11511187Swollman u_int t_flags; 1161541Srgrimes 117191688Szec struct vnet *t_vnet; /* back pointer to parent vnet */ 118191688Szec 1191541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 12032821Sdg tcp_seq snd_max; /* highest sequence number sent; 12132821Sdg * used to recognize retransmits 12232821Sdg */ 1231541Srgrimes tcp_seq snd_nxt; /* send next */ 1241541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 12532821Sdg 1261541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 1271541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 1281541Srgrimes tcp_seq iss; /* initial send sequence number */ 12932821Sdg tcp_seq irs; /* initial receive sequence number */ 13032821Sdg 13132821Sdg tcp_seq rcv_nxt; /* receive next */ 13232821Sdg tcp_seq rcv_adv; /* advertised window */ 1331541Srgrimes u_long rcv_wnd; /* receive window */ 1341541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 13532821Sdg 13632821Sdg u_long snd_wnd; /* send window */ 1371541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 138102017Sdillon u_long snd_bwnd; /* bandwidth-controlled window */ 13913765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 1401541Srgrimes * for slow start exponential to 1411541Srgrimes * linear switch 1421541Srgrimes */ 143102017Sdillon u_long snd_bandwidth; /* calculated bandwidth or 0 */ 144109175Shsu tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 14560067Sjlemon 14632821Sdg u_int t_maxopd; /* mss plus options */ 14732821Sdg 148194303Sjhb u_int t_rcvtime; /* inactivity time */ 149194303Sjhb u_int t_starttime; /* time connection was established */ 150194303Sjhb u_int t_rtttime; /* RTT measurement start time */ 1511541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 15232821Sdg 153194303Sjhb u_int t_bw_rtttime; /* used for bandwidth calculation */ 154102017Sdillon tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 155102017Sdillon 15650673Sjlemon int t_rxtcur; /* current retransmit value (ticks) */ 15732821Sdg u_int t_maxseg; /* maximum segment size */ 15811187Swollman int t_srtt; /* smoothed round-trip time */ 15911187Swollman int t_rttvar; /* variance in round-trip time */ 16032821Sdg 16132821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 16211187Swollman u_int t_rttmin; /* minimum rtt allowed */ 163102017Sdillon u_int t_rttbest; /* best rtt we've seen */ 16432821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1651541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1661541Srgrimes 16732821Sdg int t_softerror; /* possible error not yet reported */ 1681541Srgrimes/* out-of-band data */ 1691541Srgrimes char t_oobflags; /* have some */ 1701541Srgrimes char t_iobc; /* input character */ 1711541Srgrimes/* RFC 1323 variables */ 1721541Srgrimes u_char snd_scale; /* window scaling for send window */ 1731541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1741541Srgrimes u_char request_r_scale; /* pending window scaling */ 175162277Sandre u_int32_t ts_recent; /* timestamp echo data */ 176194303Sjhb u_int ts_recent_age; /* when last updated */ 177162277Sandre u_int32_t ts_offset; /* our timestamp offset */ 17832821Sdg 1791541Srgrimes tcp_seq last_ack_sent; 18050673Sjlemon/* experimental */ 18150673Sjlemon u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 18250673Sjlemon u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 183117650Shsu tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 184194303Sjhb u_int t_badrxtwin; /* window for retransmit recovery */ 185112957Shsu u_char snd_limited; /* segments limited transmitted */ 186131078Sbms/* SACK related state */ 187130989Sps int snd_numholes; /* number of holes seen by sender */ 188146953Sps TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 189146953Sps /* SACK scoreboard (sorted) */ 190146630Sps tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 191130989Sps int rcv_numsacks; /* # distinct sack blks present */ 192130989Sps struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 193136151Sps tcp_seq sack_newdata; /* New data xmitted in this recovery 194136151Sps episode starts at this seq number */ 195146123Sps struct sackhint sackhint; /* SACK scoreboard hint */ 196155767Sandre int t_rttlow; /* smallest observerved RTT */ 197166405Sandre u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 198166405Sandre int rfbuf_cnt; /* recv buffer autoscaling byte count */ 199191688Szec struct toe_usrreqs *t_tu; /* offload operations vector */ 200174560Skmacy void *t_toe; /* TOE pcb pointer */ 201187289Slstewart int t_bytes_acked; /* # bytes acked during current RTT */ 202195634Slstewart 203195634Slstewart int t_ispare; /* explicit pad for 64bit alignment */ 204195634Slstewart void *t_pspare2[6]; /* 2 CC / 4 TBD */ 205195634Slstewart uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */ 2061541Srgrimes}; 2071541Srgrimes 208185855Srwatson/* 209185855Srwatson * Flags and utility macros for the t_flags field. 210185855Srwatson */ 211185855Srwatson#define TF_ACKNOW 0x000001 /* ack peer immediately */ 212185855Srwatson#define TF_DELACK 0x000002 /* ack, but try to delay it */ 213185855Srwatson#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 214185855Srwatson#define TF_NOOPT 0x000008 /* don't use tcp options */ 215185855Srwatson#define TF_SENTFIN 0x000010 /* have sent FIN */ 216185855Srwatson#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 217185855Srwatson#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 218185855Srwatson#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 219185855Srwatson#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 220185855Srwatson#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 221185855Srwatson#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 222185855Srwatson#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 223185855Srwatson#define TF_NOPUSH 0x001000 /* don't push */ 224185855Srwatson#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 225185855Srwatson#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 226185855Srwatson#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 227185855Srwatson#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 228185855Srwatson#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 229185855Srwatson#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 230185855Srwatson#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 231185855Srwatson#define TF_FORCEDATA 0x800000 /* force out a byte */ 232185855Srwatson#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 233185855Srwatson#define TF_TOE 0x2000000 /* this connection is offloaded */ 234185855Srwatson#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 235185855Srwatson#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 236185855Srwatson#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 237185855Srwatson 238117650Shsu#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 239117650Shsu#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 240117650Shsu#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 241117650Shsu 242185855Srwatson/* 243185855Srwatson * Flags for the t_oobflags field. 244185855Srwatson */ 245185855Srwatson#define TCPOOB_HAVEDATA 0x01 246185855Srwatson#define TCPOOB_HADDATA 0x02 247185855Srwatson 248125680Sbms#ifdef TCP_SIGNATURE 2496247Swollman/* 250125680Sbms * Defines which are needed by the xform_tcp module and tcp_[in|out]put 251125680Sbms * for SADB verification and lookup. 252125680Sbms */ 253125680Sbms#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 254125680Sbms#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 255125680Sbms#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 256125680Sbms/* 257125680Sbms * Only a single SA per host may be specified at this time. An SPI is 258125680Sbms * needed in order for the KEY_ALLOCSA() lookup to work. 259125680Sbms */ 260125680Sbms#define TCP_SIG_SPI 0x1000 261125680Sbms#endif /* TCP_SIGNATURE */ 262125680Sbms 263125680Sbms/* 2646247Swollman * Structure to hold TCP options that are only used during segment 2656247Swollman * processing (in tcp_input), but not held in the tcpcb. 2666247Swollman * It's basically used to reduce the number of parameters 267167606Sandre * to tcp_dooptions and tcp_addoptions. 268167606Sandre * The binary order of the to_flags is relevant for packing of the 269167606Sandre * options in tcp_addoptions. 2706247Swollman */ 2716247Swollmanstruct tcpopt { 272195654Slstewart u_int64_t to_flags; /* which options are present */ 273167606Sandre#define TOF_MSS 0x0001 /* maximum segment size */ 274167606Sandre#define TOF_SCALE 0x0002 /* window scaling */ 275178349Sbz#define TOF_SACKPERM 0x0004 /* SACK permitted */ 276167606Sandre#define TOF_TS 0x0010 /* timestamp */ 277178349Sbz#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 278168906Sandre#define TOF_SACK 0x0080 /* Peer sent SACK option */ 279168906Sandre#define TOF_MAXOPT 0x0100 280168906Sandre u_int32_t to_tsval; /* new timestamp */ 281167606Sandre u_int32_t to_tsecr; /* reflected timestamp */ 282195654Slstewart u_char *to_sacks; /* pointer to the first SACK blocks */ 283195654Slstewart u_char *to_signature; /* pointer to the TCP-MD5 signature */ 284167606Sandre u_int16_t to_mss; /* maximum segment size */ 285167606Sandre u_int8_t to_wscale; /* window scaling */ 286147637Sps u_int8_t to_nsacks; /* number of SACK blocks */ 2876247Swollman}; 2886247Swollman 289159949Sandre/* 290159949Sandre * Flags for tcp_dooptions. 291159949Sandre */ 292159949Sandre#define TO_SYN 0x01 /* parse SYN-only options */ 293159949Sandre 294122922Sandrestruct hc_metrics_lite { /* must stay in sync with hc_metrics */ 295122922Sandre u_long rmx_mtu; /* MTU for this path */ 296122922Sandre u_long rmx_ssthresh; /* outbound gateway buffer limit */ 297122922Sandre u_long rmx_rtt; /* estimated round trip time */ 298122922Sandre u_long rmx_rttvar; /* estimated rtt variance */ 299122922Sandre u_long rmx_bandwidth; /* estimated bandwidth */ 300122922Sandre u_long rmx_cwnd; /* congestion window */ 301122922Sandre u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 302122922Sandre u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 303122922Sandre}; 304122922Sandre 305159725Sandre#ifndef _NETINET_IN_PCB_H_ 306159725Sandrestruct in_conninfo; 307159725Sandre#endif /* _NETINET_IN_PCB_H_ */ 308159725Sandre 309111145Sjlemonstruct tcptw { 310111145Sjlemon struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 311111145Sjlemon tcp_seq snd_nxt; 312111145Sjlemon tcp_seq rcv_nxt; 313121850Ssilby tcp_seq iss; 314121884Ssilby tcp_seq irs; 315111145Sjlemon u_short last_win; /* cached window value */ 316111145Sjlemon u_short tw_so_options; /* copy of so_options */ 317111145Sjlemon struct ucred *tw_cred; /* user credentials */ 318194303Sjhb u_int32_t t_recent; 319169477Sandre u_int32_t ts_offset; /* our timestamp offset */ 320194303Sjhb u_int t_starttime; 321112009Sjlemon int tw_time; 322162111Sru TAILQ_ENTRY(tcptw) tw_2msl; 323111145Sjlemon}; 324133874Srwatson 3251541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 326111145Sjlemon#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 3271541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 3281541Srgrimes 3291541Srgrimes/* 3301541Srgrimes * The smoothed round-trip time and estimated variance 3311541Srgrimes * are stored as fixed point numbers scaled by the values below. 3321541Srgrimes * For convenience, these scales are also used in smoothing the average 3331541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 3341541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 3351541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 3361541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 3371541Srgrimes */ 33814753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 33914753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 34014753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 34114753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 34214753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 3431541Srgrimes 3441541Srgrimes/* 3451541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 3461541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 3471541Srgrimes * will each average +1/2 tick of bias. When we compute 3481541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 3491541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 3501541Srgrimes * firing of the timer. The bias will give us exactly the 3511541Srgrimes * 1.5 tick we need. But, because the bias is 3521541Srgrimes * statistical, we have to test that we don't drop below 3531541Srgrimes * the minimum feasible timer (which is 2 ticks). 35414753Swollman * This version of the macro adapted from a paper by Lawrence 35514753Swollman * Brakmo and Larry Peterson which outlines a problem caused 35614753Swollman * by insufficient precision in the original implementation, 35714753Swollman * which results in inappropriately large RTO values for very 35814753Swollman * fast networks. 3591541Srgrimes */ 3601541Srgrimes#define TCP_REXMTVAL(tp) \ 36135419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 36216141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 3631541Srgrimes 3641541Srgrimes/* 3651541Srgrimes * TCP statistics. 3661541Srgrimes * Many of these should be kept per connection, 3671541Srgrimes * but that's inconvenient at the moment. 3681541Srgrimes */ 3691541Srgrimesstruct tcpstat { 3701541Srgrimes u_long tcps_connattempt; /* connections initiated */ 3711541Srgrimes u_long tcps_accepts; /* connections accepted */ 3721541Srgrimes u_long tcps_connects; /* connections established */ 3731541Srgrimes u_long tcps_drops; /* connections dropped */ 3741541Srgrimes u_long tcps_conndrops; /* embryonic connections dropped */ 375124258Sandre u_long tcps_minmssdrops; /* average minmss too low drops */ 3761541Srgrimes u_long tcps_closed; /* conn. closed (includes drops) */ 3771541Srgrimes u_long tcps_segstimed; /* segs where we tried to get rtt */ 3781541Srgrimes u_long tcps_rttupdated; /* times we succeeded */ 3791541Srgrimes u_long tcps_delack; /* delayed acks sent */ 3801541Srgrimes u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 3811541Srgrimes u_long tcps_rexmttimeo; /* retransmit timeouts */ 3821541Srgrimes u_long tcps_persisttimeo; /* persist timeouts */ 3831541Srgrimes u_long tcps_keeptimeo; /* keepalive timeouts */ 3841541Srgrimes u_long tcps_keepprobe; /* keepalive probes sent */ 3851541Srgrimes u_long tcps_keepdrops; /* connections dropped in keepalive */ 3861541Srgrimes 3871541Srgrimes u_long tcps_sndtotal; /* total packets sent */ 3881541Srgrimes u_long tcps_sndpack; /* data packets sent */ 3891541Srgrimes u_long tcps_sndbyte; /* data bytes sent */ 3901541Srgrimes u_long tcps_sndrexmitpack; /* data packets retransmitted */ 3911541Srgrimes u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 392100373Sdillon u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 3931541Srgrimes u_long tcps_sndacks; /* ack-only packets sent */ 3941541Srgrimes u_long tcps_sndprobe; /* window probes sent */ 3951541Srgrimes u_long tcps_sndurg; /* packets sent with URG only */ 3961541Srgrimes u_long tcps_sndwinup; /* window update-only packets sent */ 3971541Srgrimes u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 3981541Srgrimes 3991541Srgrimes u_long tcps_rcvtotal; /* total packets received */ 4001541Srgrimes u_long tcps_rcvpack; /* packets received in sequence */ 4011541Srgrimes u_long tcps_rcvbyte; /* bytes received in sequence */ 4021541Srgrimes u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 4031541Srgrimes u_long tcps_rcvbadoff; /* packets received with bad offset */ 40452904Sshin u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 4051541Srgrimes u_long tcps_rcvshort; /* packets received too short */ 4061541Srgrimes u_long tcps_rcvduppack; /* duplicate-only packets received */ 4071541Srgrimes u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 4081541Srgrimes u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 4091541Srgrimes u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 4101541Srgrimes u_long tcps_rcvoopack; /* out-of-order packets received */ 4111541Srgrimes u_long tcps_rcvoobyte; /* out-of-order bytes received */ 4121541Srgrimes u_long tcps_rcvpackafterwin; /* packets with data after window */ 4131541Srgrimes u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 4141541Srgrimes u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 4151541Srgrimes u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 4161541Srgrimes u_long tcps_rcvdupack; /* rcvd duplicate acks */ 4171541Srgrimes u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 4181541Srgrimes u_long tcps_rcvackpack; /* rcvd ack packets */ 4191541Srgrimes u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 4201541Srgrimes u_long tcps_rcvwinupd; /* rcvd window update packets */ 4211541Srgrimes u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 4221541Srgrimes u_long tcps_predack; /* times hdr predict ok for acks */ 4231541Srgrimes u_long tcps_preddat; /* times hdr predict ok for data pkts */ 4241541Srgrimes u_long tcps_pcbcachemiss; 4259263Swollman u_long tcps_cachedrtt; /* times cached RTT in route updated */ 4269263Swollman u_long tcps_cachedrttvar; /* times cached rttvar updated */ 4279263Swollman u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 4289470Swollman u_long tcps_usedrtt; /* times RTT initialized from route */ 4299470Swollman u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 4309470Swollman u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 43110937Swollman u_long tcps_persistdrop; /* timeout in persist state */ 43210937Swollman u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 43311415Swollman u_long tcps_mturesent; /* resends due to MTU discovery */ 43414281Sbde u_long tcps_listendrop; /* listen queue overflows */ 435128653Ssilby u_long tcps_badrst; /* ignored RSTs in the window */ 43686764Sjlemon 43786764Sjlemon u_long tcps_sc_added; /* entry added to syncache */ 43886764Sjlemon u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 43986764Sjlemon u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 44086764Sjlemon u_long tcps_sc_dropped; /* could not reply to packet */ 44186764Sjlemon u_long tcps_sc_completed; /* successful extraction of entry */ 44286764Sjlemon u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 44386764Sjlemon u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 44486764Sjlemon u_long tcps_sc_reset; /* RST removed entry from syncache */ 44586764Sjlemon u_long tcps_sc_stale; /* timed out or listen socket gone */ 44686764Sjlemon u_long tcps_sc_aborted; /* syncache entry aborted */ 44786764Sjlemon u_long tcps_sc_badack; /* removed due to bad ACK */ 44886764Sjlemon u_long tcps_sc_unreach; /* ICMP unreachable received */ 44986764Sjlemon u_long tcps_sc_zonefail; /* zalloc() failed */ 45086764Sjlemon u_long tcps_sc_sendcookie; /* SYN cookie sent */ 45186764Sjlemon u_long tcps_sc_recvcookie; /* SYN cookie received */ 452122922Sandre 453122922Sandre u_long tcps_hc_added; /* entry added to hostcache */ 454122922Sandre u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 455130989Sps 456167036Smohans u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 457167036Smohans 458130989Sps /* SACK related stats */ 459130989Sps u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 460130989Sps u_long tcps_sack_rexmits; /* SACK rexmit segments */ 461133874Srwatson u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 462130989Sps u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 463130989Sps u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 464143339Sps u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 465181056Srpaulo 466181056Srpaulo /* ECN related stats */ 467181056Srpaulo u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 468181056Srpaulo u_long tcps_ecn_ect0; /* ECN Capable Transport */ 469181056Srpaulo u_long tcps_ecn_ect1; /* ECN Capable Transport */ 470181056Srpaulo u_long tcps_ecn_shs; /* ECN successful handshakes */ 471181056Srpaulo u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 472195634Slstewart 473195634Slstewart u_long _pad[12]; /* 6 UTO, 6 TBD */ 4741541Srgrimes}; 4751541Srgrimes 476190978Srwatson#ifdef _KERNEL 477196039Srwatson/* 478196039Srwatson * In-kernel consumers can use these accessor macros directly to update 479196039Srwatson * stats. 480196039Srwatson */ 481190948Srwatson#define TCPSTAT_ADD(name, val) V_tcpstat.name += (val) 482190948Srwatson#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 483196039Srwatson 484196039Srwatson/* 485196039Srwatson * Kernel module consumers must use this accessor macro. 486196039Srwatson */ 487196039Srwatsonvoid kmod_tcpstat_inc(int statnum); 488196039Srwatson#define KMOD_TCPSTAT_INC(name) \ 489196039Srwatson kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long)) 490190978Srwatson#endif 491190948Srwatson 4926247Swollman/* 49336079Swollman * TCB structure exported to user-land via sysctl(3). 49437183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 49537183Sjhay * included. Not all of our clients do. 49636079Swollman */ 49737183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 498197244Ssilbystruct xtcp_timer { 499197244Ssilby int tt_rexmt; /* retransmit timer */ 500197244Ssilby int tt_persist; /* retransmit persistence */ 501197244Ssilby int tt_keep; /* keepalive */ 502197244Ssilby int tt_2msl; /* 2*msl TIME_WAIT timer */ 503197244Ssilby int tt_delack; /* delayed ACK timer */ 504197244Ssilby int t_rcvtime; /* Time since last packet received */ 505197244Ssilby}; 50636079Swollmanstruct xtcpcb { 50736079Swollman size_t xt_len; 50836079Swollman struct inpcb xt_inp; 50936079Swollman struct tcpcb xt_tp; 51036079Swollman struct xsocket xt_socket; 511197244Ssilby struct xtcp_timer xt_timer; 51236079Swollman u_quad_t xt_alignment_hack; 51336079Swollman}; 51436079Swollman#endif 51536079Swollman 51636079Swollman/* 5176247Swollman * Names for TCP sysctl objects 5186247Swollman */ 5196247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 5206247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 5216472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 5226472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 5236472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 5246472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 52518281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 52618281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 52763431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 52836079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 52950673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 53052904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 531130989Sps#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 532141381Smaxim#define TCPCTL_DROP 15 /* drop tcp connection */ 533141381Smaxim#define TCPCTL_MAXID 16 534167036Smohans#define TCPCTL_FINWAIT2_TIMEOUT 17 5356247Swollman 5366247Swollman#define TCPCTL_NAMES { \ 5376247Swollman { 0, 0 }, \ 5386348Swollman { "rfc1323", CTLTYPE_INT }, \ 5396247Swollman { "mssdflt", CTLTYPE_INT }, \ 5406472Swollman { "stats", CTLTYPE_STRUCT }, \ 5416472Swollman { "rttdflt", CTLTYPE_INT }, \ 5426472Swollman { "keepidle", CTLTYPE_INT }, \ 5436472Swollman { "keepintvl", CTLTYPE_INT }, \ 5446472Swollman { "sendspace", CTLTYPE_INT }, \ 5456472Swollman { "recvspace", CTLTYPE_INT }, \ 54618281Spst { "keepinit", CTLTYPE_INT }, \ 54736079Swollman { "pcblist", CTLTYPE_STRUCT }, \ 54850673Sjlemon { "delacktime", CTLTYPE_INT }, \ 54952904Sshin { "v6mssdflt", CTLTYPE_INT }, \ 550122922Sandre { "maxid", CTLTYPE_INT }, \ 5516247Swollman} 5526247Swollman 55344078Sdfr 55455205Speter#ifdef _KERNEL 55544078Sdfr#ifdef SYSCTL_DECL 55644078SdfrSYSCTL_DECL(_net_inet_tcp); 557136151SpsSYSCTL_DECL(_net_inet_tcp_sack); 558169683SandreMALLOC_DECLARE(M_TCPLOG); 55944078Sdfr#endif 56044078Sdfr 561195699SrwatsonVNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 562195699SrwatsonVNET_DECLARE(struct inpcbinfo, tcbinfo); 563195699SrwatsonVNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 564207369Sbzextern int tcp_log_in_vain; 565195699SrwatsonVNET_DECLARE(int, tcp_mssdflt); /* XXX */ 566195699SrwatsonVNET_DECLARE(int, tcp_minmss); 567195699SrwatsonVNET_DECLARE(int, tcp_delack_enabled); 568211464SandreVNET_DECLARE(int, tcp_do_rfc3390); 569195699SrwatsonVNET_DECLARE(int, tcp_do_newreno); 570195699SrwatsonVNET_DECLARE(int, path_mtu_discovery); 571195699SrwatsonVNET_DECLARE(int, ss_fltsz); 572195699SrwatsonVNET_DECLARE(int, ss_fltsz_local); 573195727Srwatson#define V_tcb VNET(tcb) 574195727Srwatson#define V_tcbinfo VNET(tcbinfo) 575195727Srwatson#define V_tcpstat VNET(tcpstat) 576195727Srwatson#define V_tcp_mssdflt VNET(tcp_mssdflt) 577195727Srwatson#define V_tcp_minmss VNET(tcp_minmss) 578195727Srwatson#define V_tcp_delack_enabled VNET(tcp_delack_enabled) 579211464Sandre#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 580195727Srwatson#define V_tcp_do_newreno VNET(tcp_do_newreno) 581195727Srwatson#define V_path_mtu_discovery VNET(path_mtu_discovery) 582195727Srwatson#define V_ss_fltsz VNET(ss_fltsz) 583195727Srwatson#define V_ss_fltsz_local VNET(ss_fltsz_local) 584185088Szec 585195699SrwatsonVNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 586195699SrwatsonVNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 587207369Sbz#define V_tcp_do_sack VNET(tcp_do_sack) 588207369Sbz#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 589207369Sbz 590195699SrwatsonVNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 591195699SrwatsonVNET_DECLARE(int, tcp_ecn_maxretries); 592195727Srwatson#define V_tcp_do_ecn VNET(tcp_do_ecn) 593195727Srwatson#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 594195699Srwatson 595167606Sandreint tcp_addoptions(struct tcpopt *, u_char *); 5961541Srgrimesstruct tcpcb * 59792723Salfred tcp_close(struct tcpcb *); 598157376Srwatsonvoid tcp_discardcb(struct tcpcb *); 599111145Sjlemonvoid tcp_twstart(struct tcpcb *); 600162064Sglebius#if 0 601121850Ssilbyint tcp_twrecycleable(struct tcptw *tw); 602162064Sglebius#endif 603157376Srwatsonvoid tcp_twclose(struct tcptw *_tw, int _reuse); 60492723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 60592723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 6061541Srgrimesstruct tcpcb * 60792723Salfred tcp_drop(struct tcpcb *, int); 60892723Salfredvoid tcp_drain(void); 60992723Salfredvoid tcp_init(void); 610193731Szec#ifdef VIMAGE 611193731Szecvoid tcp_destroy(void); 612193731Szec#endif 613128452Ssilbyvoid tcp_fini(void *); 614169683Sandrechar *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 615171229Speter const void *); 616211462Sandrechar *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 617211462Sandre const void *); 618169541Sandreint tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 619126193Sandrevoid tcp_reass_init(void); 620204838Sbz#ifdef VIMAGE 621204838Sbzvoid tcp_reass_destroy(void); 622204838Sbz#endif 62392723Salfredvoid tcp_input(struct mbuf *, int); 624162084Sandreu_long tcp_maxmtu(struct in_conninfo *, int *); 625162084Sandreu_long tcp_maxmtu6(struct in_conninfo *, int *); 626184722Sbzvoid tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); 62792723Salfredvoid tcp_mss(struct tcpcb *, int); 628122922Sandreint tcp_mssopt(struct in_conninfo *); 629133874Srwatsonstruct inpcb * 63098211Shsu tcp_drop_syn_sent(struct inpcb *, int); 63198211Shsustruct inpcb * 63298211Shsu tcp_mtudisc(struct inpcb *, int); 6331541Srgrimesstruct tcpcb * 63492723Salfred tcp_newtcpcb(struct inpcb *); 63592723Salfredint tcp_output(struct tcpcb *); 63692723Salfredvoid tcp_respond(struct tcpcb *, void *, 63792723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 638169541Sandrevoid tcp_tw_init(void); 639193731Szec#ifdef VIMAGE 640193731Szecvoid tcp_tw_destroy(void); 641193731Szec#endif 642169541Sandrevoid tcp_tw_zone_change(void); 643169608Sandreint tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 644169608Sandre struct mbuf *, int); 645126351Srwatsonint tcp_twrespond(struct tcptw *, int); 64692723Salfredvoid tcp_setpersist(struct tcpcb *); 647125783Sbms#ifdef TCP_SIGNATURE 648125783Sbmsint tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 649125783Sbms#endif 65092723Salfredvoid tcp_slowtimo(void); 65155679Sshinstruct tcptemp * 652111144Sjlemon tcpip_maketemplate(struct inpcb *); 653111144Sjlemonvoid tcpip_fillheaders(struct inpcb *, void *, void *); 654168615Sandrevoid tcp_timer_activate(struct tcpcb *, int, u_int); 655168615Sandreint tcp_timer_active(struct tcpcb *, int); 656169272Srwatsonvoid tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 657102017Sdillonvoid tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 658122922Sandre/* 659122922Sandre * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 660122922Sandre */ 661122922Sandrevoid tcp_hc_init(void); 662193731Szec#ifdef VIMAGE 663193731Szecvoid tcp_hc_destroy(void); 664193731Szec#endif 665122922Sandrevoid tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 666122922Sandreu_long tcp_hc_getmtu(struct in_conninfo *); 667122922Sandrevoid tcp_hc_updatemtu(struct in_conninfo *, u_long); 668122922Sandrevoid tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 6699470Swollman 67017096Swollmanextern struct pr_usrreqs tcp_usrreqs; 6719470Swollmanextern u_long tcp_sendspace; 6729470Swollmanextern u_long tcp_recvspace; 67392723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 6749470Swollman 675147637Spsvoid tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 676142031Spsvoid tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 677130989Spsvoid tcp_clean_sackreport(struct tcpcb *tp); 678130989Spsvoid tcp_sack_adjust(struct tcpcb *tp); 679136151Spsstruct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 680130989Spsvoid tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 681130989Spsvoid tcp_free_sackholes(struct tcpcb *tp); 682130989Spsint tcp_newreno(struct tcpcb *, struct tcphdr *); 683130989Spsu_long tcp_seq_subtract(u_long, u_long ); 684130989Sps 68555205Speter#endif /* _KERNEL */ 6862169Spaul 6876348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 688