tcp_var.h revision 231025
1/*- 2 * Copyright (c) 1982, 1986, 1993, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 30 * $FreeBSD: head/sys/netinet/tcp_var.h 231025 2012-02-05 16:53:02Z glebius $ 31 */ 32 33#ifndef _NETINET_TCP_VAR_H_ 34#define _NETINET_TCP_VAR_H_ 35 36#include <netinet/tcp.h> 37 38#ifdef _KERNEL 39#include <net/vnet.h> 40 41/* 42 * Kernel variables for tcp. 43 */ 44VNET_DECLARE(int, tcp_do_rfc1323); 45#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 46 47#endif /* _KERNEL */ 48 49/* TCP segment queue entry */ 50struct tseg_qent { 51 LIST_ENTRY(tseg_qent) tqe_q; 52 int tqe_len; /* TCP segment data length */ 53 struct tcphdr *tqe_th; /* a pointer to tcp header */ 54 struct mbuf *tqe_m; /* mbuf contains packet */ 55}; 56LIST_HEAD(tsegqe_head, tseg_qent); 57 58struct sackblk { 59 tcp_seq start; /* start seq no. of sack block */ 60 tcp_seq end; /* end seq no. */ 61}; 62 63struct sackhole { 64 tcp_seq start; /* start seq no. of hole */ 65 tcp_seq end; /* end seq no. */ 66 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 67 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 68}; 69 70struct sackhint { 71 struct sackhole *nexthole; 72 int sack_bytes_rexmit; 73 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 74 75 int ispare; /* explicit pad for 64bit alignment */ 76 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 77}; 78 79struct tcptemp { 80 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 81 struct tcphdr tt_t; 82}; 83 84#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 85 86/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 87#ifdef INET6 88#define ND6_HINT(tp) \ 89do { \ 90 if ((tp) && (tp)->t_inpcb && \ 91 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 92 nd6_nud_hint(NULL, NULL, 0); \ 93} while (0) 94#else 95#define ND6_HINT(tp) 96#endif 97 98/* 99 * Tcp control block, one per tcp; fields: 100 * Organized for 16 byte cacheline efficiency. 101 */ 102struct tcpcb { 103 struct tsegqe_head t_segq; /* segment reassembly queue */ 104 void *t_pspare[2]; /* new reassembly queue */ 105 int t_segqlen; /* segment reassembly queue length */ 106 int t_dupacks; /* consecutive dup acks recd */ 107 108 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 109 110 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 111 int t_state; /* state of this connection */ 112 u_int t_flags; 113 114 struct vnet *t_vnet; /* back pointer to parent vnet */ 115 116 tcp_seq snd_una; /* send unacknowledged */ 117 tcp_seq snd_max; /* highest sequence number sent; 118 * used to recognize retransmits 119 */ 120 tcp_seq snd_nxt; /* send next */ 121 tcp_seq snd_up; /* send urgent pointer */ 122 123 tcp_seq snd_wl1; /* window update seg seq number */ 124 tcp_seq snd_wl2; /* window update seg ack number */ 125 tcp_seq iss; /* initial send sequence number */ 126 tcp_seq irs; /* initial receive sequence number */ 127 128 tcp_seq rcv_nxt; /* receive next */ 129 tcp_seq rcv_adv; /* advertised window */ 130 u_long rcv_wnd; /* receive window */ 131 tcp_seq rcv_up; /* receive urgent pointer */ 132 133 u_long snd_wnd; /* send window */ 134 u_long snd_cwnd; /* congestion-controlled window */ 135 u_long snd_spare1; /* unused */ 136 u_long snd_ssthresh; /* snd_cwnd size threshold for 137 * for slow start exponential to 138 * linear switch 139 */ 140 u_long snd_spare2; /* unused */ 141 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 142 143 u_int t_maxopd; /* mss plus options */ 144 145 u_int t_rcvtime; /* inactivity time */ 146 u_int t_starttime; /* time connection was established */ 147 u_int t_rtttime; /* RTT measurement start time */ 148 tcp_seq t_rtseq; /* sequence number being timed */ 149 150 u_int t_bw_spare1; /* unused */ 151 tcp_seq t_bw_spare2; /* unused */ 152 153 int t_rxtcur; /* current retransmit value (ticks) */ 154 u_int t_maxseg; /* maximum segment size */ 155 int t_srtt; /* smoothed round-trip time */ 156 int t_rttvar; /* variance in round-trip time */ 157 158 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 159 u_int t_rttmin; /* minimum rtt allowed */ 160 u_int t_rttbest; /* best rtt we've seen */ 161 u_long t_rttupdated; /* number of times rtt sampled */ 162 u_long max_sndwnd; /* largest window peer has offered */ 163 164 int t_softerror; /* possible error not yet reported */ 165/* out-of-band data */ 166 char t_oobflags; /* have some */ 167 char t_iobc; /* input character */ 168/* RFC 1323 variables */ 169 u_char snd_scale; /* window scaling for send window */ 170 u_char rcv_scale; /* window scaling for recv window */ 171 u_char request_r_scale; /* pending window scaling */ 172 u_int32_t ts_recent; /* timestamp echo data */ 173 u_int ts_recent_age; /* when last updated */ 174 u_int32_t ts_offset; /* our timestamp offset */ 175 176 tcp_seq last_ack_sent; 177/* experimental */ 178 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 179 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 180 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 181 int t_sndzerowin; /* zero-window updates sent */ 182 u_int t_badrxtwin; /* window for retransmit recovery */ 183 u_char snd_limited; /* segments limited transmitted */ 184/* SACK related state */ 185 int snd_numholes; /* number of holes seen by sender */ 186 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 187 /* SACK scoreboard (sorted) */ 188 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 189 int rcv_numsacks; /* # distinct sack blks present */ 190 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 191 tcp_seq sack_newdata; /* New data xmitted in this recovery 192 episode starts at this seq number */ 193 struct sackhint sackhint; /* SACK scoreboard hint */ 194 int t_rttlow; /* smallest observerved RTT */ 195 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 196 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 197 struct toe_usrreqs *t_tu; /* offload operations vector */ 198 int t_sndrexmitpack; /* retransmit packets sent */ 199 int t_rcvoopack; /* out-of-order packets received */ 200 void *t_toe; /* TOE pcb pointer */ 201 int t_bytes_acked; /* # bytes acked during current RTT */ 202 struct cc_algo *cc_algo; /* congestion control algorithm */ 203 struct cc_var *ccv; /* congestion control specific vars */ 204 struct osd *osd; /* storage for Khelp module data */ 205 206 u_int t_keepinit; /* time to establish connection */ 207 u_int t_keepidle; /* time before keepalive probes begin */ 208 u_int t_keepintvl; /* interval between keepalives */ 209 u_int t_keepcnt; /* number of keepalives before close */ 210 211 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */ 212 void *t_pspare2[4]; /* 4 TBD */ 213 uint64_t _pad[6]; /* 6 TBD (1-2 CC/RTT?) */ 214}; 215 216/* 217 * Flags and utility macros for the t_flags field. 218 */ 219#define TF_ACKNOW 0x000001 /* ack peer immediately */ 220#define TF_DELACK 0x000002 /* ack, but try to delay it */ 221#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 222#define TF_NOOPT 0x000008 /* don't use tcp options */ 223#define TF_SENTFIN 0x000010 /* have sent FIN */ 224#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 225#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 226#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 227#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 228#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 229#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 230#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 231#define TF_NOPUSH 0x001000 /* don't push */ 232#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 233#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 234#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 235#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 236#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 237#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 238#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 239#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 240#define TF_FORCEDATA 0x800000 /* force out a byte */ 241#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 242#define TF_TOE 0x2000000 /* this connection is offloaded */ 243#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 244#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 245#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 246#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 247#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 248 249#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 250#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 251#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 252 253#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 254#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 255#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 256 257#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 258#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 259#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 260 261#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 262 263/* 264 * Flags for the t_oobflags field. 265 */ 266#define TCPOOB_HAVEDATA 0x01 267#define TCPOOB_HADDATA 0x02 268 269#ifdef TCP_SIGNATURE 270/* 271 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 272 * for SADB verification and lookup. 273 */ 274#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 275#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 276#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 277/* 278 * Only a single SA per host may be specified at this time. An SPI is 279 * needed in order for the KEY_ALLOCSA() lookup to work. 280 */ 281#define TCP_SIG_SPI 0x1000 282#endif /* TCP_SIGNATURE */ 283 284/* 285 * Structure to hold TCP options that are only used during segment 286 * processing (in tcp_input), but not held in the tcpcb. 287 * It's basically used to reduce the number of parameters 288 * to tcp_dooptions and tcp_addoptions. 289 * The binary order of the to_flags is relevant for packing of the 290 * options in tcp_addoptions. 291 */ 292struct tcpopt { 293 u_int64_t to_flags; /* which options are present */ 294#define TOF_MSS 0x0001 /* maximum segment size */ 295#define TOF_SCALE 0x0002 /* window scaling */ 296#define TOF_SACKPERM 0x0004 /* SACK permitted */ 297#define TOF_TS 0x0010 /* timestamp */ 298#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 299#define TOF_SACK 0x0080 /* Peer sent SACK option */ 300#define TOF_MAXOPT 0x0100 301 u_int32_t to_tsval; /* new timestamp */ 302 u_int32_t to_tsecr; /* reflected timestamp */ 303 u_char *to_sacks; /* pointer to the first SACK blocks */ 304 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 305 u_int16_t to_mss; /* maximum segment size */ 306 u_int8_t to_wscale; /* window scaling */ 307 u_int8_t to_nsacks; /* number of SACK blocks */ 308 u_int32_t to_spare; /* UTO */ 309}; 310 311/* 312 * Flags for tcp_dooptions. 313 */ 314#define TO_SYN 0x01 /* parse SYN-only options */ 315 316struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 317 u_long rmx_mtu; /* MTU for this path */ 318 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 319 u_long rmx_rtt; /* estimated round trip time */ 320 u_long rmx_rttvar; /* estimated rtt variance */ 321 u_long rmx_bandwidth; /* estimated bandwidth */ 322 u_long rmx_cwnd; /* congestion window */ 323 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 324 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 325}; 326 327#ifndef _NETINET_IN_PCB_H_ 328struct in_conninfo; 329#endif /* _NETINET_IN_PCB_H_ */ 330 331struct tcptw { 332 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 333 tcp_seq snd_nxt; 334 tcp_seq rcv_nxt; 335 tcp_seq iss; 336 tcp_seq irs; 337 u_short last_win; /* cached window value */ 338 u_short tw_so_options; /* copy of so_options */ 339 struct ucred *tw_cred; /* user credentials */ 340 u_int32_t t_recent; 341 u_int32_t ts_offset; /* our timestamp offset */ 342 u_int t_starttime; 343 int tw_time; 344 TAILQ_ENTRY(tcptw) tw_2msl; 345}; 346 347#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 348#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 349#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 350 351/* 352 * The smoothed round-trip time and estimated variance 353 * are stored as fixed point numbers scaled by the values below. 354 * For convenience, these scales are also used in smoothing the average 355 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 356 * With these scales, srtt has 3 bits to the right of the binary point, 357 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 358 * binary point, and is smoothed with an ALPHA of 0.75. 359 */ 360#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 361#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 362#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 363#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 364#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 365 366/* 367 * The initial retransmission should happen at rtt + 4 * rttvar. 368 * Because of the way we do the smoothing, srtt and rttvar 369 * will each average +1/2 tick of bias. When we compute 370 * the retransmit timer, we want 1/2 tick of rounding and 371 * 1 extra tick because of +-1/2 tick uncertainty in the 372 * firing of the timer. The bias will give us exactly the 373 * 1.5 tick we need. But, because the bias is 374 * statistical, we have to test that we don't drop below 375 * the minimum feasible timer (which is 2 ticks). 376 * This version of the macro adapted from a paper by Lawrence 377 * Brakmo and Larry Peterson which outlines a problem caused 378 * by insufficient precision in the original implementation, 379 * which results in inappropriately large RTO values for very 380 * fast networks. 381 */ 382#define TCP_REXMTVAL(tp) \ 383 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 384 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 385 386/* 387 * TCP statistics. 388 * Many of these should be kept per connection, 389 * but that's inconvenient at the moment. 390 */ 391struct tcpstat { 392 u_long tcps_connattempt; /* connections initiated */ 393 u_long tcps_accepts; /* connections accepted */ 394 u_long tcps_connects; /* connections established */ 395 u_long tcps_drops; /* connections dropped */ 396 u_long tcps_conndrops; /* embryonic connections dropped */ 397 u_long tcps_minmssdrops; /* average minmss too low drops */ 398 u_long tcps_closed; /* conn. closed (includes drops) */ 399 u_long tcps_segstimed; /* segs where we tried to get rtt */ 400 u_long tcps_rttupdated; /* times we succeeded */ 401 u_long tcps_delack; /* delayed acks sent */ 402 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 403 u_long tcps_rexmttimeo; /* retransmit timeouts */ 404 u_long tcps_persisttimeo; /* persist timeouts */ 405 u_long tcps_keeptimeo; /* keepalive timeouts */ 406 u_long tcps_keepprobe; /* keepalive probes sent */ 407 u_long tcps_keepdrops; /* connections dropped in keepalive */ 408 409 u_long tcps_sndtotal; /* total packets sent */ 410 u_long tcps_sndpack; /* data packets sent */ 411 u_long tcps_sndbyte; /* data bytes sent */ 412 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 413 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 414 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 415 u_long tcps_sndacks; /* ack-only packets sent */ 416 u_long tcps_sndprobe; /* window probes sent */ 417 u_long tcps_sndurg; /* packets sent with URG only */ 418 u_long tcps_sndwinup; /* window update-only packets sent */ 419 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 420 421 u_long tcps_rcvtotal; /* total packets received */ 422 u_long tcps_rcvpack; /* packets received in sequence */ 423 u_long tcps_rcvbyte; /* bytes received in sequence */ 424 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 425 u_long tcps_rcvbadoff; /* packets received with bad offset */ 426 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 427 u_long tcps_rcvshort; /* packets received too short */ 428 u_long tcps_rcvduppack; /* duplicate-only packets received */ 429 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 430 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 431 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 432 u_long tcps_rcvoopack; /* out-of-order packets received */ 433 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 434 u_long tcps_rcvpackafterwin; /* packets with data after window */ 435 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 436 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 437 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 438 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 439 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 440 u_long tcps_rcvackpack; /* rcvd ack packets */ 441 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 442 u_long tcps_rcvwinupd; /* rcvd window update packets */ 443 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 444 u_long tcps_predack; /* times hdr predict ok for acks */ 445 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 446 u_long tcps_pcbcachemiss; 447 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 448 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 449 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 450 u_long tcps_usedrtt; /* times RTT initialized from route */ 451 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 452 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 453 u_long tcps_persistdrop; /* timeout in persist state */ 454 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 455 u_long tcps_mturesent; /* resends due to MTU discovery */ 456 u_long tcps_listendrop; /* listen queue overflows */ 457 u_long tcps_badrst; /* ignored RSTs in the window */ 458 459 u_long tcps_sc_added; /* entry added to syncache */ 460 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 461 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 462 u_long tcps_sc_dropped; /* could not reply to packet */ 463 u_long tcps_sc_completed; /* successful extraction of entry */ 464 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 465 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 466 u_long tcps_sc_reset; /* RST removed entry from syncache */ 467 u_long tcps_sc_stale; /* timed out or listen socket gone */ 468 u_long tcps_sc_aborted; /* syncache entry aborted */ 469 u_long tcps_sc_badack; /* removed due to bad ACK */ 470 u_long tcps_sc_unreach; /* ICMP unreachable received */ 471 u_long tcps_sc_zonefail; /* zalloc() failed */ 472 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 473 u_long tcps_sc_recvcookie; /* SYN cookie received */ 474 475 u_long tcps_hc_added; /* entry added to hostcache */ 476 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 477 478 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 479 480 /* SACK related stats */ 481 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 482 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 483 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 484 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 485 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 486 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 487 488 /* ECN related stats */ 489 u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 490 u_long tcps_ecn_ect0; /* ECN Capable Transport */ 491 u_long tcps_ecn_ect1; /* ECN Capable Transport */ 492 u_long tcps_ecn_shs; /* ECN successful handshakes */ 493 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 494 495 /* TCP_SIGNATURE related stats */ 496 u_long tcps_sig_rcvgoodsig; /* Total matching signature received */ 497 u_long tcps_sig_rcvbadsig; /* Total bad signature received */ 498 u_long tcps_sig_err_buildsig; /* Mismatching signature received */ 499 u_long tcps_sig_err_sigopt; /* No signature expected by socket */ 500 u_long tcps_sig_err_nosigopt; /* No signature provided by segment */ 501 502 u_long _pad[12]; /* 6 UTO, 6 TBD */ 503}; 504 505#ifdef _KERNEL 506/* 507 * In-kernel consumers can use these accessor macros directly to update 508 * stats. 509 */ 510#define TCPSTAT_ADD(name, val) V_tcpstat.name += (val) 511#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 512 513/* 514 * Kernel module consumers must use this accessor macro. 515 */ 516void kmod_tcpstat_inc(int statnum); 517#define KMOD_TCPSTAT_INC(name) \ 518 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long)) 519 520/* 521 * TCP specific helper hook point identifiers. 522 */ 523#define HHOOK_TCP_EST_IN 0 524#define HHOOK_TCP_EST_OUT 1 525#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 526 527struct tcp_hhook_data { 528 struct tcpcb *tp; 529 struct tcphdr *th; 530 struct tcpopt *to; 531 long len; 532 int tso; 533 tcp_seq curack; 534}; 535#endif 536 537/* 538 * TCB structure exported to user-land via sysctl(3). 539 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 540 * included. Not all of our clients do. 541 */ 542#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 543struct xtcp_timer { 544 int tt_rexmt; /* retransmit timer */ 545 int tt_persist; /* retransmit persistence */ 546 int tt_keep; /* keepalive */ 547 int tt_2msl; /* 2*msl TIME_WAIT timer */ 548 int tt_delack; /* delayed ACK timer */ 549 int t_rcvtime; /* Time since last packet received */ 550}; 551struct xtcpcb { 552 size_t xt_len; 553 struct inpcb xt_inp; 554 struct tcpcb xt_tp; 555 struct xsocket xt_socket; 556 struct xtcp_timer xt_timer; 557 u_quad_t xt_alignment_hack; 558}; 559#endif 560 561/* 562 * Names for TCP sysctl objects 563 */ 564#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 565#define TCPCTL_MSSDFLT 3 /* MSS default */ 566#define TCPCTL_STATS 4 /* statistics (read-only) */ 567#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 568#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 569#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 570#define TCPCTL_SENDSPACE 8 /* send buffer space */ 571#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 572#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 573#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 574#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 575#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 576#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 577#define TCPCTL_DROP 15 /* drop tcp connection */ 578#define TCPCTL_MAXID 16 579#define TCPCTL_FINWAIT2_TIMEOUT 17 580 581#define TCPCTL_NAMES { \ 582 { 0, 0 }, \ 583 { "rfc1323", CTLTYPE_INT }, \ 584 { "mssdflt", CTLTYPE_INT }, \ 585 { "stats", CTLTYPE_STRUCT }, \ 586 { "rttdflt", CTLTYPE_INT }, \ 587 { "keepidle", CTLTYPE_INT }, \ 588 { "keepintvl", CTLTYPE_INT }, \ 589 { "sendspace", CTLTYPE_INT }, \ 590 { "recvspace", CTLTYPE_INT }, \ 591 { "keepinit", CTLTYPE_INT }, \ 592 { "pcblist", CTLTYPE_STRUCT }, \ 593 { "delacktime", CTLTYPE_INT }, \ 594 { "v6mssdflt", CTLTYPE_INT }, \ 595 { "maxid", CTLTYPE_INT }, \ 596} 597 598 599#ifdef _KERNEL 600#ifdef SYSCTL_DECL 601SYSCTL_DECL(_net_inet_tcp); 602SYSCTL_DECL(_net_inet_tcp_sack); 603MALLOC_DECLARE(M_TCPLOG); 604#endif 605 606VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 607VNET_DECLARE(struct inpcbinfo, tcbinfo); 608VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 609extern int tcp_log_in_vain; 610VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 611VNET_DECLARE(int, tcp_minmss); 612VNET_DECLARE(int, tcp_delack_enabled); 613VNET_DECLARE(int, tcp_do_rfc3390); 614VNET_DECLARE(int, tcp_sendspace); 615VNET_DECLARE(int, tcp_recvspace); 616VNET_DECLARE(int, path_mtu_discovery); 617VNET_DECLARE(int, tcp_do_rfc3465); 618VNET_DECLARE(int, tcp_abc_l_var); 619#define V_tcb VNET(tcb) 620#define V_tcbinfo VNET(tcbinfo) 621#define V_tcpstat VNET(tcpstat) 622#define V_tcp_mssdflt VNET(tcp_mssdflt) 623#define V_tcp_minmss VNET(tcp_minmss) 624#define V_tcp_delack_enabled VNET(tcp_delack_enabled) 625#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 626#define V_tcp_sendspace VNET(tcp_sendspace) 627#define V_tcp_recvspace VNET(tcp_recvspace) 628#define V_path_mtu_discovery VNET(path_mtu_discovery) 629#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 630#define V_tcp_abc_l_var VNET(tcp_abc_l_var) 631 632VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 633VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 634#define V_tcp_do_sack VNET(tcp_do_sack) 635#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 636 637VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 638VNET_DECLARE(int, tcp_ecn_maxretries); 639#define V_tcp_do_ecn VNET(tcp_do_ecn) 640#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 641 642VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 643#define V_tcp_hhh VNET(tcp_hhh) 644 645int tcp_addoptions(struct tcpopt *, u_char *); 646int tcp_ccalgounload(struct cc_algo *unload_algo); 647struct tcpcb * 648 tcp_close(struct tcpcb *); 649void tcp_discardcb(struct tcpcb *); 650void tcp_twstart(struct tcpcb *); 651#if 0 652int tcp_twrecycleable(struct tcptw *tw); 653#endif 654void tcp_twclose(struct tcptw *_tw, int _reuse); 655void tcp_ctlinput(int, struct sockaddr *, void *); 656int tcp_ctloutput(struct socket *, struct sockopt *); 657struct tcpcb * 658 tcp_drop(struct tcpcb *, int); 659void tcp_drain(void); 660void tcp_init(void); 661#ifdef VIMAGE 662void tcp_destroy(void); 663#endif 664void tcp_fini(void *); 665char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 666 const void *); 667char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 668 const void *); 669int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 670void tcp_reass_init(void); 671void tcp_reass_flush(struct tcpcb *); 672#ifdef VIMAGE 673void tcp_reass_destroy(void); 674#endif 675void tcp_input(struct mbuf *, int); 676u_long tcp_maxmtu(struct in_conninfo *, int *); 677u_long tcp_maxmtu6(struct in_conninfo *, int *); 678void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); 679void tcp_mss(struct tcpcb *, int); 680int tcp_mssopt(struct in_conninfo *); 681struct inpcb * 682 tcp_drop_syn_sent(struct inpcb *, int); 683struct inpcb * 684 tcp_mtudisc(struct inpcb *, int); 685struct tcpcb * 686 tcp_newtcpcb(struct inpcb *); 687int tcp_output(struct tcpcb *); 688void tcp_respond(struct tcpcb *, void *, 689 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 690void tcp_tw_init(void); 691#ifdef VIMAGE 692void tcp_tw_destroy(void); 693#endif 694void tcp_tw_zone_change(void); 695int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 696 struct mbuf *, int); 697int tcp_twrespond(struct tcptw *, int); 698void tcp_setpersist(struct tcpcb *); 699#ifdef TCP_SIGNATURE 700int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 701int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *, 702 struct tcphdr *, u_int); 703#endif 704void tcp_slowtimo(void); 705struct tcptemp * 706 tcpip_maketemplate(struct inpcb *); 707void tcpip_fillheaders(struct inpcb *, void *, void *); 708void tcp_timer_activate(struct tcpcb *, int, u_int); 709int tcp_timer_active(struct tcpcb *, int); 710void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 711/* 712 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 713 */ 714void tcp_hc_init(void); 715#ifdef VIMAGE 716void tcp_hc_destroy(void); 717#endif 718void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 719u_long tcp_hc_getmtu(struct in_conninfo *); 720void tcp_hc_updatemtu(struct in_conninfo *, u_long); 721void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 722 723extern struct pr_usrreqs tcp_usrreqs; 724tcp_seq tcp_new_isn(struct tcpcb *); 725 726void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 727void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 728void tcp_clean_sackreport(struct tcpcb *tp); 729void tcp_sack_adjust(struct tcpcb *tp); 730struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 731void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 732void tcp_free_sackholes(struct tcpcb *tp); 733int tcp_newreno(struct tcpcb *, struct tcphdr *); 734u_long tcp_seq_subtract(u_long, u_long ); 735 736void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 737 738#endif /* _KERNEL */ 739 740#endif /* _NETINET_TCP_VAR_H_ */ 741