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sys/netinet/tcp_var.h
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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: src/sys/netinet/tcp_var.h,v 1.109.2.8 2005/05/04 13:59:26 andre Exp $ 31 */ 32 33 #ifndef _NETINET_TCP_VAR_H_ 34 #define _NETINET_TCP_VAR_H_ 35 36 #include <netinet/tcp.h> 37 38 /* 39 * Kernel variables for tcp. 40 */ 41 extern int tcp_do_rfc1323; 42 extern int tcp_do_rfc1644; 43 44 /* TCP segment queue entry */ 45 struct tseg_qent { 46 LIST_ENTRY(tseg_qent) tqe_q; 47 int tqe_len; /* TCP segment data length */ 48 struct tcphdr *tqe_th; /* a pointer to tcp header */ 49 struct mbuf *tqe_m; /* mbuf contains packet */ 50 }; 51 LIST_HEAD(tsegqe_head, tseg_qent); 52 extern int tcp_reass_qsize; 53 extern struct uma_zone *tcp_reass_zone; 54 55 struct sackblk { 56 tcp_seq start; /* start seq no. of sack block */ 57 tcp_seq end; /* end seq no. */ 58 }; 59 60 struct sackhole { 61 tcp_seq start; /* start seq no. of hole */ 62 tcp_seq end; /* end seq no. */ 63 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 64 struct sackhole *next; /* next in list */ 65 }; 66 67 struct tcptemp { 68 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 69 struct tcphdr tt_t; 70 }; 71 72 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 73 74 /* 75 * Tcp control block, one per tcp; fields: 76 * Organized for 16 byte cacheline efficiency. 77 */ 78 struct tcpcb { 79 struct tsegqe_head t_segq; /* segment reassembly queue */ 80 int t_segqlen; /* segment reassembly queue length */ 81 int t_dupacks; /* consecutive dup acks recd */ 82 struct tcptemp *unused; /* unused */ 83 84 struct callout *tt_rexmt; /* retransmit timer */ 85 struct callout *tt_persist; /* retransmit persistence */ 86 struct callout *tt_keep; /* keepalive */ 87 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 88 struct callout *tt_delack; /* delayed ACK timer */ 89 90 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 91 int t_state; /* state of this connection */ 92 u_int t_flags; 93 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 94 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 95 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 96 #define TF_NOOPT 0x000008 /* don't use tcp options */ 97 #define TF_SENTFIN 0x000010 /* have sent FIN */ 98 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 99 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 100 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 101 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 102 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 103 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 104 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 105 #define TF_NOPUSH 0x001000 /* don't push */ 106 #define TF_REQ_CC 0x002000 /* have/will request CC */ 107 #define TF_RCVD_CC 0x004000 /* a CC was received in SYN */ 108 #define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */ 109 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 110 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 111 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 112 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 113 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 114 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 115 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 116 int t_force; /* 1 if forcing out a byte */ 117 118 tcp_seq snd_una; /* send unacknowledged */ 119 tcp_seq snd_max; /* highest sequence number sent; 120 * used to recognize retransmits 121 */ 122 tcp_seq snd_nxt; /* send next */ 123 tcp_seq snd_up; /* send urgent pointer */ 124 125 tcp_seq snd_wl1; /* window update seg seq number */ 126 tcp_seq snd_wl2; /* window update seg ack number */ 127 tcp_seq iss; /* initial send sequence number */ 128 tcp_seq irs; /* initial receive sequence number */ 129 130 tcp_seq rcv_nxt; /* receive next */ 131 tcp_seq rcv_adv; /* advertised window */ 132 u_long rcv_wnd; /* receive window */ 133 tcp_seq rcv_up; /* receive urgent pointer */ 134 135 u_long snd_wnd; /* send window */ 136 u_long snd_cwnd; /* congestion-controlled window */ 137 u_long snd_bwnd; /* bandwidth-controlled window */ 138 u_long snd_ssthresh; /* snd_cwnd size threshold for 139 * for slow start exponential to 140 * linear switch 141 */ 142 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 143 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 144 145 u_int t_maxopd; /* mss plus options */ 146 147 u_long t_rcvtime; /* inactivity time */ 148 u_long t_starttime; /* time connection was established */ 149 int t_rtttime; /* round trip time */ 150 tcp_seq t_rtseq; /* sequence number being timed */ 151 152 int t_bw_rtttime; /* used for bandwidth calculation */ 153 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 154 155 int t_rxtcur; /* current retransmit value (ticks) */ 156 u_int t_maxseg; /* maximum segment size */ 157 int t_srtt; /* smoothed round-trip time */ 158 int t_rttvar; /* variance in round-trip time */ 159 160 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 161 u_int t_rttmin; /* minimum rtt allowed */ 162 u_int t_rttbest; /* best rtt we've seen */ 163 u_long t_rttupdated; /* number of times rtt sampled */ 164 u_long max_sndwnd; /* largest window peer has offered */ 165 166 int t_softerror; /* possible error not yet reported */ 167 /* out-of-band data */ 168 char t_oobflags; /* have some */ 169 char t_iobc; /* input character */ 170 #define TCPOOB_HAVEDATA 0x01 171 #define TCPOOB_HADDATA 0x02 172 /* RFC 1323 variables */ 173 u_char snd_scale; /* window scaling for send window */ 174 u_char rcv_scale; /* window scaling for recv window */ 175 u_char request_r_scale; /* pending window scaling */ 176 u_char requested_s_scale; 177 u_long ts_recent; /* timestamp echo data */ 178 179 u_long ts_recent_age; /* when last updated */ 180 tcp_seq last_ack_sent; 181 /* RFC 1644 variables */ 182 tcp_cc cc_send; /* send connection count */ 183 tcp_cc cc_recv; /* receive connection count */ 184 /* experimental */ 185 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 186 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 187 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 188 u_long t_badrxtwin; /* window for retransmit recovery */ 189 u_char snd_limited; /* segments limited transmitted */ 190 /* anti DoS counters */ 191 u_long rcv_second; /* start of interval second */ 192 u_long rcv_pps; /* received packets per second */ 193 u_long rcv_byps; /* received bytes per second */ 194 /* SACK related state */ 195 int sack_enable; /* enable SACK for this connection */ 196 int snd_numholes; /* number of holes seen by sender */ 197 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 198 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 199 int rcv_numsacks; /* # distinct sack blks present */ 200 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 201 tcp_seq sack_newdata; /* New data xmitted in this recovery 202 episode starts at this seq number */ 203 }; 204 205 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 206 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 207 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 208 209 #ifdef TCP_SIGNATURE 210 /* 211 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 212 * for SADB verification and lookup. 213 */ 214 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 215 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 216 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 217 /* 218 * Only a single SA per host may be specified at this time. An SPI is 219 * needed in order for the KEY_ALLOCSA() lookup to work. 220 */ 221 #define TCP_SIG_SPI 0x1000 222 #endif /* TCP_SIGNATURE */ 223 224 /* 225 * Structure to hold TCP options that are only used during segment 226 * processing (in tcp_input), but not held in the tcpcb. 227 * It's basically used to reduce the number of parameters 228 * to tcp_dooptions. 229 */ 230 struct tcpopt { 231 u_long to_flags; /* which options are present */ 232 #define TOF_TS 0x0001 /* timestamp */ 233 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 234 #define TOF_CCNEW 0x0004 235 #define TOF_CCECHO 0x0008 236 #define TOF_MSS 0x0010 237 #define TOF_SCALE 0x0020 238 #define TOF_SIGNATURE 0x0040 /* signature option present */ 239 #define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */ 240 #define TOF_SACK 0x0100 /* Peer sent SACK option */ 241 u_int32_t to_tsval; 242 u_int32_t to_tsecr; 243 tcp_cc to_cc; /* holds CC or CCnew */ 244 tcp_cc to_ccecho; 245 u_int16_t to_mss; 246 u_int8_t to_requested_s_scale; 247 u_int8_t to_pad; 248 }; 249 250 #ifdef _NETINET_IN_PCB_H_ 251 struct syncache { 252 inp_gen_t sc_inp_gencnt; /* pointer check */ 253 struct tcpcb *sc_tp; /* tcb for listening socket */ 254 struct mbuf *sc_ipopts; /* source route */ 255 struct in_conninfo sc_inc; /* addresses */ 256 u_int32_t sc_tsrecent; 257 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 258 tcp_cc sc_cc_send; /* holds CC or CCnew */ 259 tcp_cc sc_cc_recv; 260 tcp_seq sc_irs; /* seq from peer */ 261 tcp_seq sc_iss; /* our ISS */ 262 u_long sc_rxttime; /* retransmit time */ 263 u_int16_t sc_rxtslot; /* retransmit counter */ 264 u_int16_t sc_peer_mss; /* peer's MSS */ 265 u_int16_t sc_wnd; /* advertised window */ 266 u_int8_t sc_requested_s_scale:4, 267 sc_request_r_scale:4; 268 u_int8_t sc_flags; 269 #define SCF_NOOPT 0x01 /* no TCP options */ 270 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 271 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 272 #define SCF_CC 0x08 /* negotiated CC */ 273 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 274 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 275 #define SCF_SACK 0x80 /* send SACK option */ 276 TAILQ_ENTRY(syncache) sc_hash; 277 TAILQ_ENTRY(syncache) sc_timerq; 278 }; 279 280 struct syncache_head { 281 TAILQ_HEAD(, syncache) sch_bucket; 282 u_int sch_length; 283 }; 284 #else 285 struct in_conninfo; 286 #endif /* _NETINET_IN_PCB_H_ */ 287 288 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 289 u_long rmx_mtu; /* MTU for this path */ 290 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 291 u_long rmx_rtt; /* estimated round trip time */ 292 u_long rmx_rttvar; /* estimated rtt variance */ 293 u_long rmx_bandwidth; /* estimated bandwidth */ 294 u_long rmx_cwnd; /* congestion window */ 295 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 296 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 297 }; 298 299 struct tcptw { 300 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 301 tcp_seq snd_nxt; 302 tcp_seq rcv_nxt; 303 tcp_seq iss; 304 tcp_seq irs; 305 tcp_cc cc_recv; 306 tcp_cc cc_send; 307 u_short last_win; /* cached window value */ 308 u_short tw_so_options; /* copy of so_options */ 309 struct ucred *tw_cred; /* user credentials */ 310 u_long t_recent; 311 u_long t_starttime; 312 int tw_time; 313 LIST_ENTRY(tcptw) tw_2msl; 314 }; 315 316 /* 317 * The TAO cache entry which is stored in the tcp hostcache. 318 */ 319 struct rmxp_tao { 320 tcp_cc tao_cc; /* latest CC in valid SYN */ 321 tcp_cc tao_ccsent; /* latest CC sent to peer */ 322 u_short tao_mssopt; /* peer's cached MSS */ 323 #ifdef notyet 324 u_short tao_flags; /* cache status flags */ 325 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 326 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 327 #define TAOF_UNDEF 0 /* we don't know yet */ 328 #endif /* notyet */ 329 }; 330 331 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 332 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 333 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 334 335 /* 336 * The smoothed round-trip time and estimated variance 337 * are stored as fixed point numbers scaled by the values below. 338 * For convenience, these scales are also used in smoothing the average 339 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 340 * With these scales, srtt has 3 bits to the right of the binary point, 341 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 342 * binary point, and is smoothed with an ALPHA of 0.75. 343 */ 344 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 345 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 346 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 347 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 348 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 349 350 /* 351 * The initial retransmission should happen at rtt + 4 * rttvar. 352 * Because of the way we do the smoothing, srtt and rttvar 353 * will each average +1/2 tick of bias. When we compute 354 * the retransmit timer, we want 1/2 tick of rounding and 355 * 1 extra tick because of +-1/2 tick uncertainty in the 356 * firing of the timer. The bias will give us exactly the 357 * 1.5 tick we need. But, because the bias is 358 * statistical, we have to test that we don't drop below 359 * the minimum feasible timer (which is 2 ticks). 360 * This version of the macro adapted from a paper by Lawrence 361 * Brakmo and Larry Peterson which outlines a problem caused 362 * by insufficient precision in the original implementation, 363 * which results in inappropriately large RTO values for very 364 * fast networks. 365 */ 366 #define TCP_REXMTVAL(tp) \ 367 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 368 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 369 370 /* 371 * TCP statistics. 372 * Many of these should be kept per connection, 373 * but that's inconvenient at the moment. 374 */ 375 struct tcpstat { 376 u_long tcps_connattempt; /* connections initiated */ 377 u_long tcps_accepts; /* connections accepted */ 378 u_long tcps_connects; /* connections established */ 379 u_long tcps_drops; /* connections dropped */ 380 u_long tcps_conndrops; /* embryonic connections dropped */ 381 u_long tcps_minmssdrops; /* average minmss too low drops */ 382 u_long tcps_closed; /* conn. closed (includes drops) */ 383 u_long tcps_segstimed; /* segs where we tried to get rtt */ 384 u_long tcps_rttupdated; /* times we succeeded */ 385 u_long tcps_delack; /* delayed acks sent */ 386 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 387 u_long tcps_rexmttimeo; /* retransmit timeouts */ 388 u_long tcps_persisttimeo; /* persist timeouts */ 389 u_long tcps_keeptimeo; /* keepalive timeouts */ 390 u_long tcps_keepprobe; /* keepalive probes sent */ 391 u_long tcps_keepdrops; /* connections dropped in keepalive */ 392 393 u_long tcps_sndtotal; /* total packets sent */ 394 u_long tcps_sndpack; /* data packets sent */ 395 u_long tcps_sndbyte; /* data bytes sent */ 396 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 397 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 398 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 399 u_long tcps_sndacks; /* ack-only packets sent */ 400 u_long tcps_sndprobe; /* window probes sent */ 401 u_long tcps_sndurg; /* packets sent with URG only */ 402 u_long tcps_sndwinup; /* window update-only packets sent */ 403 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 404 405 u_long tcps_rcvtotal; /* total packets received */ 406 u_long tcps_rcvpack; /* packets received in sequence */ 407 u_long tcps_rcvbyte; /* bytes received in sequence */ 408 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 409 u_long tcps_rcvbadoff; /* packets received with bad offset */ 410 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 411 u_long tcps_rcvshort; /* packets received too short */ 412 u_long tcps_rcvduppack; /* duplicate-only packets received */ 413 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 414 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 415 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 416 u_long tcps_rcvoopack; /* out-of-order packets received */ 417 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 418 u_long tcps_rcvpackafterwin; /* packets with data after window */ 419 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 420 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 421 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 422 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 423 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 424 u_long tcps_rcvackpack; /* rcvd ack packets */ 425 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 426 u_long tcps_rcvwinupd; /* rcvd window update packets */ 427 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 428 u_long tcps_predack; /* times hdr predict ok for acks */ 429 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 430 u_long tcps_pcbcachemiss; 431 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 432 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 433 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 434 u_long tcps_usedrtt; /* times RTT initialized from route */ 435 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 436 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 437 u_long tcps_persistdrop; /* timeout in persist state */ 438 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 439 u_long tcps_mturesent; /* resends due to MTU discovery */ 440 u_long tcps_listendrop; /* listen queue overflows */ 441 u_long tcps_badrst; /* ignored RSTs in the window */ 442 443 u_long tcps_sc_added; /* entry added to syncache */ 444 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 445 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 446 u_long tcps_sc_dropped; /* could not reply to packet */ 447 u_long tcps_sc_completed; /* successful extraction of entry */ 448 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 449 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 450 u_long tcps_sc_reset; /* RST removed entry from syncache */ 451 u_long tcps_sc_stale; /* timed out or listen socket gone */ 452 u_long tcps_sc_aborted; /* syncache entry aborted */ 453 u_long tcps_sc_badack; /* removed due to bad ACK */ 454 u_long tcps_sc_unreach; /* ICMP unreachable received */ 455 u_long tcps_sc_zonefail; /* zalloc() failed */ 456 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 457 u_long tcps_sc_recvcookie; /* SYN cookie received */ 458 459 u_long tcps_hc_added; /* entry added to hostcache */ 460 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 461 462 /* SACK related stats */ 463 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 464 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 465 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 466 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 467 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 468 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 469 }; 470 471 /* 472 * TCB structure exported to user-land via sysctl(3). 473 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 474 * included. Not all of our clients do. 475 */ 476 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 477 struct xtcpcb { 478 size_t xt_len; 479 struct inpcb xt_inp; 480 struct tcpcb xt_tp; 481 struct xsocket xt_socket; 482 u_quad_t xt_alignment_hack; 483 }; 484 #endif 485 486 /* 487 * Names for TCP sysctl objects 488 */ 489 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 490 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 491 #define TCPCTL_MSSDFLT 3 /* MSS default */ 492 #define TCPCTL_STATS 4 /* statistics (read-only) */ 493 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 494 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 495 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 496 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 497 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 498 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 499 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 500 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 501 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 502 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 503 #define TCPCTL_DROP 15 /* drop tcp connection */ 504 #define TCPCTL_MAXID 16 505 506 #define TCPCTL_NAMES { \ 507 { 0, 0 }, \ 508 { "rfc1323", CTLTYPE_INT }, \ 509 { "rfc1644", CTLTYPE_INT }, \ 510 { "mssdflt", CTLTYPE_INT }, \ 511 { "stats", CTLTYPE_STRUCT }, \ 512 { "rttdflt", CTLTYPE_INT }, \ 513 { "keepidle", CTLTYPE_INT }, \ 514 { "keepintvl", CTLTYPE_INT }, \ 515 { "sendspace", CTLTYPE_INT }, \ 516 { "recvspace", CTLTYPE_INT }, \ 517 { "keepinit", CTLTYPE_INT }, \ 518 { "pcblist", CTLTYPE_STRUCT }, \ 519 { "delacktime", CTLTYPE_INT }, \ 520 { "v6mssdflt", CTLTYPE_INT }, \ 521 { "maxid", CTLTYPE_INT }, \ 522 } 523 524 525 #ifdef _KERNEL 526 #ifdef SYSCTL_DECL 527 SYSCTL_DECL(_net_inet_tcp); 528 SYSCTL_DECL(_net_inet_tcp_sack); 529 #endif 530 531 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 532 extern struct inpcbinfo tcbinfo; 533 extern struct tcpstat tcpstat; /* tcp statistics */ 534 extern int tcp_mssdflt; /* XXX */ 535 extern int tcp_minmss; 536 extern int tcp_minmssoverload; 537 extern int tcp_delack_enabled; 538 extern int tcp_do_newreno; 539 extern int path_mtu_discovery; 540 extern int ss_fltsz; 541 extern int ss_fltsz_local; 542 543 extern int tcp_do_sack; /* SACK enabled/disabled */ 544 545 struct tcpcb * 546 tcp_close(struct tcpcb *); 547 void tcp_twstart(struct tcpcb *); 548 int tcp_twrecycleable(struct tcptw *tw); 549 struct tcptw * 550 tcp_twclose(struct tcptw *_tw, int _reuse); 551 void tcp_ctlinput(int, struct sockaddr *, void *); 552 int tcp_ctloutput(struct socket *, struct sockopt *); 553 struct tcpcb * 554 tcp_drop(struct tcpcb *, int); 555 void tcp_drain(void); 556 void tcp_fasttimo(void); 557 void tcp_init(void); 558 void tcp_fini(void *); 559 void tcp_reass_init(void); 560 void tcp_input(struct mbuf *, int); 561 u_long tcp_maxmtu(struct in_conninfo *); 562 u_long tcp_maxmtu6(struct in_conninfo *); 563 void tcp_mss(struct tcpcb *, int); 564 int tcp_mssopt(struct in_conninfo *); 565 struct inpcb * 566 tcp_drop_syn_sent(struct inpcb *, int); 567 struct inpcb * 568 tcp_mtudisc(struct inpcb *, int); 569 struct tcpcb * 570 tcp_newtcpcb(struct inpcb *); 571 int tcp_output(struct tcpcb *); 572 void tcp_respond(struct tcpcb *, void *, 573 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 574 int tcp_twrespond(struct tcptw *, int); 575 void tcp_setpersist(struct tcpcb *); 576 #ifdef TCP_SIGNATURE 577 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 578 #endif 579 void tcp_slowtimo(void); 580 struct tcptemp * 581 tcpip_maketemplate(struct inpcb *); 582 void tcpip_fillheaders(struct inpcb *, void *, void *); 583 struct tcpcb * 584 tcp_timers(struct tcpcb *, int); 585 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 586 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 587 void syncache_init(void); 588 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 589 int syncache_expand(struct in_conninfo *, struct tcphdr *, 590 struct socket **, struct mbuf *); 591 int syncache_add(struct in_conninfo *, struct tcpopt *, 592 struct tcphdr *, struct socket **, struct mbuf *); 593 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 594 void syncache_badack(struct in_conninfo *); 595 /* 596 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 597 */ 598 void tcp_hc_init(void); 599 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 600 u_long tcp_hc_getmtu(struct in_conninfo *); 601 void tcp_hc_gettao(struct in_conninfo *, struct rmxp_tao *); 602 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 603 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 604 void tcp_hc_updatetao(struct in_conninfo *, int, tcp_cc, u_short); 605 /* update which tao field */ 606 #define TCP_HC_TAO_CC 0x1 607 #define TCP_HC_TAO_CCSENT 0x2 608 #define TCP_HC_TAO_MSSOPT 0x3 609 610 extern struct pr_usrreqs tcp_usrreqs; 611 extern u_long tcp_sendspace; 612 extern u_long tcp_recvspace; 613 tcp_seq tcp_new_isn(struct tcpcb *); 614 615 int tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 616 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 617 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 618 void tcp_clean_sackreport(struct tcpcb *tp); 619 void tcp_sack_adjust(struct tcpcb *tp); 620 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 621 int tcp_sacked_bytes(struct tcpcb *tp, int *lost_not_rexmitted); 622 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 623 void tcp_free_sackholes(struct tcpcb *tp); 624 int tcp_newreno(struct tcpcb *, struct tcphdr *); 625 u_long tcp_seq_subtract(u_long, u_long ); 626 #ifdef TCP_SACK_DEBUG 627 void tcp_print_holes(struct tcpcb *tp); 628 #endif /* TCP_SACK_DEBUG */ 629 630 #endif /* _KERNEL */ 631 632 #endif /* _NETINET_TCP_VAR_H_ */
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