1 /* 2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1993, 1994, 1995 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 63 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.13 2003/02/03 02:34:07 hsu Exp $ 64 */ 65 66 #ifndef _NETINET_TCP_VAR_H_ 67 #define _NETINET_TCP_VAR_H_ 68 69 #ifndef _NETINET_IN_PCB_H_ 70 #include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 71 #endif 72 #ifndef _NETINET_TCP_H_ 73 #include <netinet/tcp.h> 74 #endif 75 76 /* 77 * Kernel variables for tcp. 78 */ 79 extern int tcp_do_rfc1323; 80 extern int tcp_low_rtobase; 81 extern int tcp_ncr_rxtthresh_max; 82 extern int tcp_do_sack; 83 extern int tcp_do_smartsack; 84 extern int tcp_do_rescuesack; 85 extern int tcp_aggressive_rescuesack; 86 extern int tcp_do_rfc6675; 87 extern int tcp_rfc6675_rxt; 88 extern int tcp_aggregate_acks; 89 extern int tcp_eifel_rtoinc; 90 extern int tcp_prio_synack; 91 92 /* TCP segment queue entry */ 93 struct tseg_qent { 94 TAILQ_ENTRY(tseg_qent) tqe_q; 95 int tqe_len; /* TCP segment data length */ 96 struct tcphdr *tqe_th; /* a pointer to tcp header */ 97 struct mbuf *tqe_m; /* mbuf contains packet */ 98 }; 99 TAILQ_HEAD(tsegqe_head, tseg_qent); 100 extern int tcp_reass_maxseg; 101 extern int tcp_reass_qsize; 102 #ifdef MALLOC_DECLARE 103 MALLOC_DECLARE(M_TSEGQ); 104 #endif 105 106 struct tcptemp { 107 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 108 struct tcphdr tt_t; 109 }; 110 111 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 112 113 struct raw_sackblock { /* covers [start, end) */ 114 tcp_seq rblk_start; 115 tcp_seq rblk_end; 116 }; 117 118 /* maximum number of SACK blocks that will fit in the TCP option space */ 119 #define MAX_SACK_REPORT_BLOCKS 4 120 121 TAILQ_HEAD(sackblock_list, sackblock); 122 123 struct scoreboard { 124 int nblocks; 125 struct sackblock_list sackblocks; 126 tcp_seq lostseq; /* passed SACK lost test */ 127 struct sackblock *lastfound; /* search hint */ 128 struct sackblock *freecache; /* one slot free block cache */ 129 }; 130 131 struct netmsg_tcp_timer; 132 struct netmsg_base; 133 134 struct tcp_pcbport { 135 struct inpcbport t_phd; 136 } __cachealign; 137 138 /* 139 * Tcp control block, one per tcp; fields: 140 * Organized for 16 byte cacheline efficiency. 141 */ 142 struct tcpcb { 143 struct tsegqe_head t_segq; 144 int t_dupacks; /* consecutive dup acks recd */ 145 int t_rxtthresh; /* # dup acks to start fast rxt */ 146 int tt_cpu; /* sanity check the cpu */ 147 148 struct tcp_pcbport *t_pcbport; /* per-cpu local port cache for 149 * accept(2)'ed sockets */ 150 151 struct tcp_callout *tt_rexmt; /* retransmit timer */ 152 struct tcp_callout *tt_persist;/* retransmit persistence */ 153 struct tcp_callout *tt_keep; /* keepalive */ 154 struct tcp_callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 155 struct tcp_callout *tt_delack; /* delayed ACK timer */ 156 struct netmsg_tcp_timer *tt_msg; /* timer message */ 157 158 struct netmsg_base *tt_sndmore;/* send more segments (fairsend) */ 159 160 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 161 int t_state; /* state of this connection */ 162 u_int t_flags; 163 #define TF_ACKNOW 0x00000001 /* ack peer immediately */ 164 #define TF_DELACK 0x00000002 /* ack, but try to delay it */ 165 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */ 166 #define TF_NOOPT 0x00000008 /* don't use tcp options */ 167 #define TF_SENTFIN 0x00000010 /* have sent FIN */ 168 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */ 169 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */ 170 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */ 171 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */ 172 #define TF_SACK_PERMITTED 0x00000200 /* other side said I could SACK */ 173 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */ 174 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */ 175 #define TF_NOPUSH 0x00001000 /* don't push */ 176 #define TF_LISTEN 0x00002000 /* listen(2) has been called */ 177 #define TF_SIGNATURE 0x00004000 /* require MD5 digests (RFC2385) */ 178 #define TF_NCR 0x00008000 /* Non-Congestion Robustness RFC4653 */ 179 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */ 180 #define TF_SAWFIN 0x00020000 /* FIN has been seen */ 181 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */ 182 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */ 183 #define TF_FASTRECOVERY 0x00100000 /* in Fast Recovery */ 184 #define TF_QUEDFIN 0x00200000 /* FIN has been received */ 185 #define TF_XMITNOW 0x00400000 /* Temporarily override Nagle */ 186 #define TF_UNUSED008 0x00800000 187 #define TF_UNUSED009 0x01000000 188 #define TF_FORCE 0x02000000 /* Set if forcing out a byte */ 189 #define TF_ONOUTPUTQ 0x04000000 /* on t_outputq list */ 190 #define TF_FAIRSEND 0x08000000 /* fairsend is requested */ 191 #define TF_UNUSED003 0x10000000 192 #define TF_UNUSED004 0x20000000 193 #define TF_KEEPALIVE 0x40000000 /* temporary keepalive */ 194 #define TF_RXRESIZED 0x80000000 /* rcvbuf was resized */ 195 tcp_seq snd_up; /* send urgent pointer */ 196 u_long snd_last; /* time last data were sent */ 197 198 tcp_seq snd_una; /* send unacknowledged */ 199 tcp_seq snd_recover; /* for use with Fast Recovery */ 200 tcp_seq snd_max; /* highest sequence number sent; 201 * used to recognize retransmits */ 202 tcp_seq snd_nxt; /* send next */ 203 204 tcp_seq snd_wl1; /* window update seg seq number */ 205 tcp_seq snd_wl2; /* window update seg ack number */ 206 tcp_seq iss; /* initial send sequence number */ 207 tcp_seq irs; /* initial receive sequence number */ 208 209 tcp_seq rcv_nxt; /* receive next */ 210 tcp_seq rcv_adv; /* advertised window */ 211 u_long rcv_wnd; /* receive window */ 212 tcp_seq rcv_up; /* receive urgent pointer */ 213 214 u_long snd_wnd; /* send window */ 215 u_long snd_cwnd; /* congestion-controlled window */ 216 u_long snd_wacked; /* bytes acked in one send window */ 217 u_long snd_ssthresh; /* snd_cwnd size threshold for 218 * for slow start exponential to 219 * linear switch */ 220 221 int t_rxtcur; /* current retransmit value (ticks) */ 222 u_int t_maxseg; /* maximum segment size */ 223 int t_srtt; /* smoothed round-trip time */ 224 int t_rttvar; /* variance in round-trip time */ 225 226 u_int t_maxopd; /* mss plus options */ 227 228 u_long t_rcvtime; /* reception inactivity time */ 229 u_long t_starttime; /* time connection was established */ 230 int t_rtttime; /* round trip time */ 231 tcp_seq t_rtseq; /* sequence number being timed */ 232 233 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 234 u_int t_rttmin; /* minimum rtt allowed */ 235 u_int t_rttbest; /* best rtt we've seen */ 236 u_long t_rttupdated; /* number of times rtt sampled */ 237 u_long max_sndwnd; /* largest window peer has offered */ 238 239 int t_softerror; /* possible error not yet reported */ 240 /* out-of-band data */ 241 char t_oobflags; /* have some */ 242 char t_iobc; /* input character */ 243 #define TCPOOB_HAVEDATA 0x01 244 #define TCPOOB_HADDATA 0x02 245 246 /* RFC 1323 variables */ 247 u_char snd_scale; /* window scaling for send window */ 248 u_char rcv_scale; /* window scaling for recv window */ 249 u_char request_r_scale; /* pending window scaling */ 250 u_long ts_recent; /* timestamp echo data */ 251 252 u_long ts_recent_age; /* when last updated */ 253 tcp_seq last_ack_sent; 254 255 /* experimental */ 256 u_int rxt_flags; 257 #define TRXT_F_REBASERTO 0x0001 /* Recalculate RTO based on new RTT */ 258 #define TRXT_F_WASFRECOVERY 0x0002 /* was in Fast Recovery */ 259 #define TRXT_F_FIRSTACCACK 0x0004 /* Look for 1st acceptable ACK. */ 260 #define TRXT_F_FASTREXMT 0x0008 /* Did Fast Retransmit. */ 261 #define TRXT_F_EARLYREXMT 0x0010 /* Did Early (Fast) Retransmit. */ 262 int t_srtt_prev; /* adjusted SRTT prior to retransmit */ 263 int t_rttvar_prev; /* RTTVAR prior to retransmit */ 264 int t_rxtcur_prev; /* rexmt timeout prior to retransmit */ 265 tcp_seq snd_max_prev; /* SND_MAX prior to retransmit */ 266 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 267 u_long snd_wacked_prev; /* prior bytes acked in send window */ 268 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 269 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 270 u_long t_badrxtwin; /* window for retransmit recovery */ 271 u_long t_rexmtTS; /* timestamp of last retransmit */ 272 u_char snd_limited; /* segments limited transmitted */ 273 274 u_int sack_flags; 275 #define TSACK_F_SACKRESCUED 0x0001 /* sent rescue SACK recovery data */ 276 #define TSACK_F_DUPSEG 0x0002 /* last seg a duplicate */ 277 #define TSACK_F_ENCLOSESEG 0x0004 /* enclosing SACK block */ 278 #define TSACK_F_SACKLEFT 0x0008 /* send SACK blocks from left side */ 279 tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */ 280 tcp_seq rexmt_rescue; /* rescue SACKED sequence number */ 281 tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */ 282 struct scoreboard scb; /* sack scoreboard */ 283 struct raw_sackblock reportblk; /* incoming segment or D-SACK block */ 284 struct raw_sackblock encloseblk; 285 int nsackhistory; 286 struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */ 287 288 TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */ 289 290 /* bandwith limitation */ 291 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 292 u_long snd_bwnd; /* bandwidth-controlled window */ 293 int t_bw_rtttime; /* used for bandwidth calculation */ 294 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 295 296 /* anti DoS counters */ 297 u_long rcv_second; /* start of interval second */ 298 u_long rcv_pps; /* received packets per second */ 299 u_long rcv_byps; /* received bytes per second */ 300 301 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 302 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 303 304 int t_keepinit; /* time to establish connection */ 305 306 int t_keepidle; /* time before keepalive probes begin */ 307 int t_keepintvl; /* time between keepalive probes */ 308 int t_keepcnt; /* maximum number of keepalive probes */ 309 int t_maxidle; /* time to drop after starting probes */ 310 311 int t_rxtsyn; /* time spent in SYN or SYN|ACK rexmt */ 312 }; 313 314 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 315 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 316 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 317 318 #ifdef TCP_SIGNATURE 319 /* 320 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 321 * for SADB verification and lookup. 322 */ 323 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 324 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 325 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 326 /* 327 * Only a single SA per host may be specified at this time. An SPI is 328 * needed in order for the KEY_ALLOCSA() lookup to work. 329 */ 330 #define TCP_SIG_SPI 0x1000 331 #endif /* TCP_SIGNATURE */ 332 333 /* 334 * TCP statistics. 335 * 336 * NOTE: Make sure this struct's size is multiple cache line size. 337 */ 338 struct tcp_stats { 339 u_long tcps_connattempt; /* connections initiated */ 340 u_long tcps_accepts; /* connections accepted */ 341 u_long tcps_connects; /* connections established */ 342 u_long tcps_drops; /* connections dropped */ 343 u_long tcps_conndrops; /* embryonic connections dropped */ 344 u_long tcps_minmssdrops; /* average minmss too low drops */ 345 u_long tcps_closed; /* conn. closed (includes drops) */ 346 u_long tcps_segstimed; /* segs where we tried to get rtt */ 347 u_long tcps_rttupdated; /* times we succeeded */ 348 u_long tcps_delack; /* delayed acks sent */ 349 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 350 u_long tcps_rexmttimeo; /* retransmit timeouts */ 351 u_long tcps_persisttimeo; /* persist timeouts */ 352 u_long tcps_keeptimeo; /* keepalive timeouts */ 353 u_long tcps_keepprobe; /* keepalive probes sent */ 354 u_long tcps_keepdrops; /* connections dropped in keepalive */ 355 356 u_long tcps_sndtotal; /* total packets sent */ 357 u_long tcps_sndpack; /* data packets sent */ 358 u_long tcps_sndbyte; /* data bytes sent */ 359 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 360 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 361 u_long tcps_sndsackrtopack; /* packets sent by SACK after RTO */ 362 u_long tcps_sndsackrtobyte; /* bytes sent by SACK after RTO */ 363 u_long tcps_sndfastrexmit; /* Fast Retransmissions */ 364 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */ 365 u_long tcps_sndlimited; /* Limited Transmit packets */ 366 u_long tcps_sndrtobad; /* spurious RTO retransmissions */ 367 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */ 368 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions, 369 a subset of tcps_sndfastrexmitbad */ 370 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */ 371 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */ 372 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */ 373 u_long tcps_sndacks; /* ack-only packets sent */ 374 u_long tcps_sndprobe; /* window probes sent */ 375 u_long tcps_sndurg; /* packets sent with URG only */ 376 u_long tcps_sndwinup; /* window update-only packets sent */ 377 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 378 u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */ 379 u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */ 380 u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */ 381 u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */ 382 u_long tcps_sndsackopt; /* SACK options sent */ 383 u_long tcps_snddsackopt; /* D-SACK options sent */ 384 u_long tcps_sndidle; /* sending idle detected */ 385 u_long tcps_sackrescue; /* SACK rescue data packets sent */ 386 u_long tcps_sackrescue_try; /* SACK rescues attempted */ 387 u_long tcps_eifelresponse; /* Eifel responses */ 388 389 u_long tcps_rcvtotal; /* total packets received */ 390 u_long tcps_rcvpack; /* packets received in sequence */ 391 u_long tcps_rcvbyte; /* bytes received in sequence */ 392 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 393 u_long tcps_rcvbadoff; /* packets received with bad offset */ 394 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 395 u_long tcps_rcvshort; /* packets received too short */ 396 u_long tcps_rcvduppack; /* duplicate-only packets received */ 397 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 398 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 399 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 400 u_long tcps_rcvoopack; /* out-of-order packets received */ 401 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 402 u_long tcps_rcvpackafterwin; /* packets with data after window */ 403 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 404 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 405 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 406 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 407 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 408 u_long tcps_rcvackpack; /* rcvd ack packets */ 409 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 410 u_long tcps_rcvwinupd; /* rcvd window update packets */ 411 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 412 u_long tcps_pawsaccept; /* segments accepted, PAWS tolerance */ 413 u_long tcps_predack; /* times hdr predict ok for acks */ 414 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 415 u_long tcps_pcbcachemiss; 416 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 417 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 418 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 419 u_long tcps_usedrtt; /* times RTT initialized from route */ 420 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 421 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 422 u_long tcps_persistdrop; /* timeout in persist state */ 423 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 424 u_long tcps_mturesent; /* resends due to MTU discovery */ 425 u_long tcps_listendrop; /* listen queue overflows */ 426 u_long tcps_rcvbadsackopt; /* rcvd illegal SACK options */ 427 u_long tcps_sackrenege; /* times other side reneged */ 428 429 u_long tcps_sacksbupdate; /* times SACK scoreboard updated */ 430 u_long tcps_sacksboverflow; /* times SACK scoreboard overflowed */ 431 u_long tcps_sacksbreused; /* times SACK sb-block reused */ 432 u_long tcps_sacksbfailed; /* times SACK sb update failed */ 433 u_long tcps_sacksbfast; /* times SACK sb-block uses cache */ 434 435 u_long tcps_sc_added; /* entry added to syncache */ 436 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 437 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 438 u_long tcps_sc_dropped; /* could not reply to packet */ 439 u_long tcps_sc_completed; /* successful extraction of entry */ 440 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 441 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 442 u_long tcps_sc_reset; /* RST removed entry from syncache */ 443 u_long tcps_sc_stale; /* timed out or listen socket gone */ 444 u_long tcps_sc_aborted; /* syncache entry aborted */ 445 u_long tcps_sc_badack; /* removed due to bad ACK */ 446 u_long tcps_sc_unreach; /* ICMP unreachable received */ 447 u_long tcps_sc_zonefail; /* zalloc() failed */ 448 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 449 u_long tcps_sc_recvcookie; /* SYN cookie received */ 450 451 u_long tcps_pad[6]; /* pad to cache line size (64B) */ 452 }; 453 454 #ifdef _KERNEL 455 456 #ifndef _NETINET_TCP_FSM_H_ 457 #include <netinet/tcp_fsm.h> 458 #endif 459 460 struct tcp_state_count { 461 u_long tcps_count[TCP_NSTATES]; 462 } __cachealign; 463 464 #define tcpstat tcpstats_percpu[mycpuid] 465 466 struct sockopt; 467 468 extern struct tcp_stats tcpstats_percpu[MAXCPU]; 469 extern struct tcp_state_count tcpstate_count[MAXCPU]; 470 471 static const int tcprexmtthresh = 3; 472 #endif 473 474 /* 475 * Structure to hold TCP options that are only used during segment 476 * processing (in tcp_input), but not held in the tcpcb. 477 * It's basically used to reduce the number of parameters 478 * to tcp_dooptions. 479 */ 480 struct tcpopt { 481 u_int to_flags; /* which options are present */ 482 #define TOF_TS 0x0001 /* timestamp */ 483 #define TOF_MSS 0x0010 484 #define TOF_SCALE 0x0020 485 #define TOF_SACK_PERMITTED 0x0040 486 #define TOF_SACK 0x0080 487 #define TOF_SIGNATURE 0x0100 /* signature option present */ 488 #define TOF_SIGLEN 0x0200 /* signature length valid (RFC2385) */ 489 #define TOF_DSACK 0x0400 /* D-SACK */ 490 #define TOF_SACK_REDUNDANT 0x0800 /* all SACK blocks are known */ 491 u_int32_t to_tsval; 492 u_int32_t to_tsecr; 493 u_int16_t to_mss; 494 u_int8_t to_requested_s_scale; 495 u_int8_t to_nsackblocks; 496 struct raw_sackblock *to_sackblocks; 497 }; 498 499 struct syncache { 500 inp_gen_t sc_inp_gencnt; /* pointer check */ 501 struct tcpcb *sc_tp; /* tcb for listening socket */ 502 struct mbuf *sc_ipopts; /* source route */ 503 struct in_conninfo sc_inc; /* addresses */ 504 #define sc_route sc_inc.inc_route 505 #define sc_route6 sc_inc.inc6_route 506 u_int32_t sc_tsrecent; 507 uint16_t sc_hashval; /* connection hash */ 508 uint16_t sc_pad; /* explicit padding */ 509 tcp_seq sc_irs; /* seq from peer */ 510 tcp_seq sc_iss; /* our ISS */ 511 u_long sc_rxttime; /* retransmit time */ 512 u_int16_t sc_rxtslot; /* retransmit counter */ 513 u_int16_t sc_peer_mss; /* peer's MSS */ 514 u_int16_t sc_wnd; /* advertised window */ 515 u_int8_t sc_requested_s_scale:4, 516 sc_request_r_scale:4; 517 u_int8_t sc_flags; 518 #define SCF_NOOPT 0x01 /* no TCP options */ 519 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 520 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 521 #define SCF_HASH 0x08 /* sc_hashval is valid */ 522 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 523 #define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */ 524 #define SCF_SIGNATURE 0x40 /* send MD5 digests */ 525 #define SCF_MARKER 0x80 /* not a real entry */ 526 int sc_rxtused; /* time spent in SYN|ACK rxt */ 527 u_long sc_sndwnd; /* send window */ 528 TAILQ_ENTRY(syncache) sc_hash; 529 TAILQ_ENTRY(syncache) sc_timerq; 530 }; 531 532 struct syncache_head { 533 TAILQ_HEAD(, syncache) sch_bucket; 534 u_int sch_length; 535 }; 536 537 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 538 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 539 540 /* 541 * The smoothed round-trip time and estimated variance 542 * are stored as fixed point numbers scaled by the values below. 543 * For convenience, these scales are also used in smoothing the average 544 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 545 * With these scales, srtt has 3 bits to the right of the binary point, 546 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 547 * binary point, and is smoothed with an ALPHA of 0.75. 548 */ 549 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 550 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 551 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 552 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 553 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 554 555 /* 556 * The initial retransmission should happen at rtt + 4 * rttvar. 557 * Because of the way we do the smoothing, srtt and rttvar 558 * will each average +1/2 tick of bias. When we compute 559 * the retransmit timer, we want 1/2 tick of rounding and 560 * 1 extra tick because of +-1/2 tick uncertainty in the 561 * firing of the timer. The bias will give us exactly the 562 * 1.5 tick we need. But, because the bias is 563 * statistical, we have to test that we don't drop below 564 * the minimum feasible timer (which is 2 ticks). 565 * This version of the macro adapted from a paper by Lawrence 566 * Brakmo and Larry Peterson which outlines a problem caused 567 * by insufficient precision in the original implementation, 568 * which results in inappropriately large RTO values for very 569 * fast networks. 570 */ 571 #define TCP_REXMTVAL(tp) \ 572 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 573 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 574 575 /* 576 * TCB structure exported to user-land via sysctl(3). 577 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 578 * included. Not all of our clients do. 579 */ 580 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 581 struct xtcpcb { 582 size_t xt_len; 583 struct inpcb xt_inp; 584 struct tcpcb xt_tp; 585 struct xsocket xt_socket; 586 u_quad_t xt_alignment_hack; 587 }; 588 #endif 589 590 /* 591 * Names for TCP sysctl objects 592 */ 593 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 594 /* 2 was TCPCTL_DO_RFC1644 */ 595 #define TCPCTL_MSSDFLT 3 /* MSS default */ 596 #define TCPCTL_STATS 4 /* statistics (read-only) */ 597 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 598 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 599 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 600 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 601 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 602 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 603 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 604 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 605 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 606 #define TCPCTL_MAXID 14 607 608 #define TCPCTL_NAMES { \ 609 { 0, 0 }, \ 610 { "rfc1323", CTLTYPE_INT }, \ 611 { "reserved", CTLTYPE_INT}, /* was rfc1644 */ \ 612 { "mssdflt", CTLTYPE_INT }, \ 613 { "stats", CTLTYPE_STRUCT }, \ 614 { "rttdflt", CTLTYPE_INT }, \ 615 { "keepidle", CTLTYPE_INT }, \ 616 { "keepintvl", CTLTYPE_INT }, \ 617 { "sendspace", CTLTYPE_INT }, \ 618 { "recvspace", CTLTYPE_INT }, \ 619 { "keepinit", CTLTYPE_INT }, \ 620 { "pcblist", CTLTYPE_STRUCT }, \ 621 { "delacktime", CTLTYPE_INT }, \ 622 { "v6mssdflt", CTLTYPE_INT }, \ 623 } 624 625 #ifdef _KERNEL 626 #ifdef SYSCTL_DECL 627 SYSCTL_DECL(_net_inet_tcp); 628 #endif 629 630 #define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED) 631 #define TCP_DO_NCR(tp) (((tp)->t_flags & TF_NCR) && TCP_DO_SACK((tp))) 632 #define TCP_SACK_BLKEND(len, thflags) \ 633 ((len) + (((thflags) & TH_FIN) != 0)) 634 635 TAILQ_HEAD(tcpcbackqhead,tcpcb); 636 637 extern struct inpcbinfo tcbinfo[]; 638 extern struct tcpcbackqhead tcpcbackq[]; 639 640 extern int tcp_mssdflt; /* XXX */ 641 extern int tcp_minmss; 642 extern int tcp_delack_enabled; 643 extern int path_mtu_discovery; 644 645 struct ip; 646 union netmsg; 647 648 int tcp_addrcpu(in_addr_t faddr, in_port_t fport, 649 in_addr_t laddr, in_port_t lport); 650 int tcp_addrhash(in_addr_t faddr, in_port_t fport, 651 in_addr_t laddr, in_port_t lport); 652 struct lwkt_port * 653 tcp_addrport(in_addr_t faddr, in_port_t fport, 654 in_addr_t laddr, in_port_t lport); 655 struct lwkt_port *tcp_addrport0(void); 656 void tcp_canceltimers (struct tcpcb *); 657 struct tcpcb * 658 tcp_close (struct tcpcb *); 659 void tcp_ctlinput(union netmsg *); 660 void tcp_ctloutput(union netmsg *); 661 struct netmsg_pr_ctloutput *tcp_ctloutmsg(struct sockopt *); 662 inp_notify_t tcp_get_inpnotify(int cmd, const struct sockaddr *sa, 663 int *arg, struct ip **ip0, int *cpuid); 664 struct tcpcb * 665 tcp_drop (struct tcpcb *, int); 666 void tcp_drain (void); 667 void tcp_init (void); 668 void tcp_thread_init (void); 669 int tcp_input (struct mbuf **, int *, int); 670 void tcp_mss (struct tcpcb *, int); 671 int tcp_mssopt (struct tcpcb *); 672 void tcp_drop_syn_sent (struct inpcb *, int); 673 void tcp_mtudisc (struct inpcb *, int); 674 void tcp_newtcpcb (struct inpcb *); 675 int tcp_output(struct tcpcb *); 676 int tcp_output_fair(struct tcpcb *); 677 void tcp_output_init(struct tcpcb *); 678 void tcp_output_cancel(struct tcpcb *); 679 boolean_t 680 tcp_output_pending(struct tcpcb *); 681 void tcp_quench (struct inpcb *, int); 682 void tcp_respond (struct tcpcb *, void *, 683 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 684 struct rtentry * 685 tcp_rtlookup (struct in_conninfo *); 686 int tcp_sack_bytes_below(const struct scoreboard *scb, tcp_seq seq); 687 void tcp_sack_destroy(struct scoreboard *scb); 688 void tcp_sack_discard(struct tcpcb *tp); 689 void tcp_sack_report_cleanup(struct tcpcb *tp); 690 boolean_t 691 tcp_sack_report_needed(const struct tcpcb *tp); 692 int tcp_sack_ndsack_blocks(const struct raw_sackblock *blocks, 693 const int numblocks, tcp_seq snd_una); 694 void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen); 695 boolean_t 696 tcp_sack_has_sacked(const struct scoreboard *scb, u_int amount); 697 void tcp_sack_tcpcb_init(struct tcpcb *tp); 698 uint32_t tcp_sack_compute_pipe(const struct tcpcb *tp); 699 boolean_t 700 tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len, 701 boolean_t *rescue); 702 boolean_t 703 tcp_sack_islost(const struct scoreboard *scb, tcp_seq seq); 704 void tcp_sack_update_lostseq(struct scoreboard *scb, tcp_seq snd_una, 705 u_int maxseg, int rxtthresh); 706 #ifdef later 707 void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una, 708 u_int maxseg); 709 void tcp_sack_save_scoreboard(struct scoreboard *scb); 710 #endif 711 void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt); 712 uint32_t tcp_sack_first_unsacked_len(const struct tcpcb *tp); 713 void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to); 714 void tcp_save_congestion_state(struct tcpcb *tp); 715 void tcp_revert_congestion_state(struct tcpcb *tp); 716 void tcp_setpersist (struct tcpcb *); 717 struct tcptemp *tcp_maketemplate (struct tcpcb *); 718 void tcp_freetemplate (struct tcptemp *); 719 void tcp_fillheaders (struct tcpcb *, void *, void *, boolean_t); 720 struct lwkt_port * 721 tcp_soport(struct socket *, struct sockaddr *, struct mbuf **); 722 struct lwkt_port * 723 tcp_ctlport(int, struct sockaddr *, void *, int *); 724 struct lwkt_port * 725 tcp_initport(void); 726 struct tcpcb * 727 tcp_timers (struct tcpcb *, int); 728 void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *, 729 int); 730 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 731 u_long tcp_initial_window(struct tcpcb *tp); 732 void tcp_timer_keep_activity(struct tcpcb *tp, int thflags); 733 void syncache_init(void); 734 void syncache_unreach(struct in_conninfo *, const struct tcphdr *); 735 int syncache_expand(struct in_conninfo *, struct tcphdr *, 736 struct socket **, struct mbuf *); 737 int syncache_add(struct in_conninfo *, struct tcpopt *, 738 struct tcphdr *, struct socket *, struct mbuf *); 739 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 740 void syncache_badack(struct in_conninfo *); 741 void syncache_destroy(struct tcpcb *tp, struct tcpcb *new_tp); 742 743 #ifdef TCP_SIGNATURE 744 int tcpsignature_apply(void *fstate, void *data, unsigned int len); 745 int tcpsignature_compute(struct mbuf *m, int len, int tcpoptlen, 746 u_char *buf, u_int direction); 747 #endif /* TCP_SIGNATURE */ 748 749 extern struct pr_usrreqs tcp_usrreqs; 750 extern u_long tcp_sendspace; 751 extern u_long tcp_recvspace; 752 tcp_seq tcp_new_isn (struct tcpcb *); 753 754 void tcp_pcbport_create(struct tcpcb *); 755 void tcp_pcbport_destroy(struct tcpcb *); 756 void tcp_pcbport_merge_oncpu(struct tcpcb *); 757 758 static __inline void 759 tcp_pcbport_insert(struct tcpcb *ltp, struct inpcb *inp) 760 { 761 struct inpcbport *phd; 762 int cpu; 763 764 if (inp->inp_lport != ltp->t_inpcb->inp_lport) { 765 /* 766 * This could happen with 'ipfw forward'. 767 */ 768 in_pcbinsporthash_lport(inp); 769 return; 770 } 771 772 cpu = mycpuid; 773 KASSERT(cpu < netisr_ncpus, ("invalid cpu%d", cpu)); 774 phd = <p->t_pcbport[cpu].t_phd; 775 776 /* 777 * NOTE: 778 * Set inp_porthash NULL and set inp_phd properly, 779 * so that tcp_pcbport_remove() could tell that this 780 * inpcb is on the listen tcpcb per-cpu port cache. 781 */ 782 inp->inp_porthash = NULL; 783 inp->inp_phd = phd; 784 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 785 } 786 787 static __inline void 788 tcp_pcbport_remove(struct inpcb *inp) 789 { 790 if (inp->inp_porthash == NULL && inp->inp_phd != NULL) { 791 /* 792 * On listen tcpcb per-cpu port cache. 793 */ 794 LIST_REMOVE(inp, inp_portlist); 795 inp->inp_phd = NULL; 796 /* NOTE: Don't whack inp_lport, which may be used later */ 797 } 798 } 799 800 static __inline void 801 _TCP_STATE_INC(const struct tcpcb *tp) 802 { 803 tcpstate_count[mycpuid].tcps_count[tp->t_state]++; 804 } 805 806 static __inline void 807 _TCP_STATE_DEC(const struct tcpcb *tp) 808 { 809 tcpstate_count[mycpuid].tcps_count[tp->t_state]--; 810 } 811 812 static __inline void 813 _TCP_STATE_SET(struct tcpcb *tp, int state) 814 { 815 tp->t_state = state; 816 _TCP_STATE_INC(tp); 817 } 818 819 static __inline void 820 TCP_STATE_INIT(struct tcpcb *tp) 821 { 822 _TCP_STATE_SET(tp, TCPS_CLOSED); 823 } 824 825 static __inline void 826 TCP_STATE_TERM(struct tcpcb *tp) 827 { 828 KASSERT(tp->t_state != TCPS_TERMINATING, ("tcpcb was terminated")); 829 _TCP_STATE_DEC(tp); 830 tp->t_state = TCPS_TERMINATING; 831 } 832 833 static __inline void 834 TCP_STATE_CHANGE(struct tcpcb *tp, int state) 835 { 836 _TCP_STATE_DEC(tp); 837 _TCP_STATE_SET(tp, state); 838 } 839 840 static __inline void 841 TCP_STATE_MIGRATE_START(const struct tcpcb *tp) 842 { 843 _TCP_STATE_DEC(tp); 844 } 845 846 static __inline void 847 TCP_STATE_MIGRATE_END(const struct tcpcb *tp) 848 { 849 _TCP_STATE_INC(tp); 850 } 851 852 #endif /* _KERNEL */ 853 854 #endif /* _NETINET_TCP_VAR_H_ */ 855