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
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219}; 220 221/* 222 * Flags and utility macros for the t_flags field. 223 */ 224#define TF_ACKNOW 0x000001 /* ack peer immediately */ 225#define TF_DELACK 0x000002 /* ack, but try to delay it */ 226#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 227#define TF_NOOPT 0x000008 /* don't use tcp options */ 228#define TF_SENTFIN 0x000010 /* have sent FIN */ 229#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 230#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 231#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 232#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 233#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 234#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 235#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 236#define TF_NOPUSH 0x001000 /* don't push */ 237#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 238#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 239#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 240#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 241#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 242#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 243#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 244#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 245#define TF_FORCEDATA 0x800000 /* force out a byte */ 246#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 247#define TF_TOE 0x2000000 /* this connection is offloaded */ 248#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 249#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 250#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 251#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 252#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 253 254#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 255#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 256#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 257 258#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 259#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 260#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 261 262#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 263#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 264#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 265 266#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 267 268/* 269 * Flags for the t_oobflags field. 270 */ 271#define TCPOOB_HAVEDATA 0x01 272#define TCPOOB_HADDATA 0x02 273 274#ifdef TCP_SIGNATURE 275/* 276 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 277 * for SADB verification and lookup. 278 */ 279#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 280#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 281#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 282/* 283 * Only a single SA per host may be specified at this time. An SPI is 284 * needed in order for the KEY_ALLOCSA() lookup to work. 285 */ 286#define TCP_SIG_SPI 0x1000 287#endif /* TCP_SIGNATURE */ 288 289/* 290 * Flags for PLPMTU handling, t_flags2 291 */ 292#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 293#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 294#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 295 296/* 297 * Structure to hold TCP options that are only used during segment 298 * processing (in tcp_input), but not held in the tcpcb. 299 * It's basically used to reduce the number of parameters 300 * to tcp_dooptions and tcp_addoptions. 301 * The binary order of the to_flags is relevant for packing of the 302 * options in tcp_addoptions. 303 */ 304struct tcpopt { 305 u_int64_t to_flags; /* which options are present */ 306#define TOF_MSS 0x0001 /* maximum segment size */ 307#define TOF_SCALE 0x0002 /* window scaling */ 308#define TOF_SACKPERM 0x0004 /* SACK permitted */ 309#define TOF_TS 0x0010 /* timestamp */ 310#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 311#define TOF_SACK 0x0080 /* Peer sent SACK option */ 312#define TOF_MAXOPT 0x0100 313 u_int32_t to_tsval; /* new timestamp */ 314 u_int32_t to_tsecr; /* reflected timestamp */ 315 u_char *to_sacks; /* pointer to the first SACK blocks */ 316 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 317 u_int16_t to_mss; /* maximum segment size */ 318 u_int8_t to_wscale; /* window scaling */ 319 u_int8_t to_nsacks; /* number of SACK blocks */ 320 u_int32_t to_spare; /* UTO */ 321}; 322 323/* 324 * Flags for tcp_dooptions. 325 */ 326#define TO_SYN 0x01 /* parse SYN-only options */ 327 328struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 329 u_long rmx_mtu; /* MTU for this path */ 330 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 331 u_long rmx_rtt; /* estimated round trip time */ 332 u_long rmx_rttvar; /* estimated rtt variance */ 333 u_long rmx_bandwidth; /* estimated bandwidth */ 334 u_long rmx_cwnd; /* congestion window */ 335 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 336 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 337}; 338 339/* 340 * Used by tcp_maxmtu() to communicate interface specific features 341 * and limits at the time of connection setup. 342 */ 343struct tcp_ifcap { 344 int ifcap; 345 u_int tsomax; 346 u_int tsomaxsegcount; 347 u_int tsomaxsegsize; 348}; 349 350#ifndef _NETINET_IN_PCB_H_ 351struct in_conninfo; 352#endif /* _NETINET_IN_PCB_H_ */ 353 354struct tcptw { 355 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 356 tcp_seq snd_nxt; 357 tcp_seq rcv_nxt; 358 tcp_seq iss; 359 tcp_seq irs; 360 u_short last_win; /* cached window value */ 361 u_short tw_so_options; /* copy of so_options */ 362 struct ucred *tw_cred; /* user credentials */ 363 u_int32_t t_recent; 364 u_int32_t ts_offset; /* our timestamp offset */ 365 u_int t_starttime; 366 int tw_time; 367 TAILQ_ENTRY(tcptw) tw_2msl; 368 void *tw_pspare; /* TCP_SIGNATURE */ 369 u_int *tw_spare; /* TCP_SIGNATURE */ 370}; 371 372#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 373#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 374#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 375 376/* 377 * The smoothed round-trip time and estimated variance 378 * are stored as fixed point numbers scaled by the values below. 379 * For convenience, these scales are also used in smoothing the average 380 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 381 * With these scales, srtt has 3 bits to the right of the binary point, 382 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 383 * binary point, and is smoothed with an ALPHA of 0.75. 384 */ 385#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 386#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 387#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 388#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 389#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 390 391/* 392 * The initial retransmission should happen at rtt + 4 * rttvar. 393 * Because of the way we do the smoothing, srtt and rttvar 394 * will each average +1/2 tick of bias. When we compute 395 * the retransmit timer, we want 1/2 tick of rounding and 396 * 1 extra tick because of +-1/2 tick uncertainty in the 397 * firing of the timer. The bias will give us exactly the 398 * 1.5 tick we need. But, because the bias is 399 * statistical, we have to test that we don't drop below 400 * the minimum feasible timer (which is 2 ticks). 401 * This version of the macro adapted from a paper by Lawrence 402 * Brakmo and Larry Peterson which outlines a problem caused 403 * by insufficient precision in the original implementation, 404 * which results in inappropriately large RTO values for very 405 * fast networks. 406 */ 407#define TCP_REXMTVAL(tp) \ 408 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 409 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 410 411/* 412 * TCP statistics. 413 * Many of these should be kept per connection, 414 * but that's inconvenient at the moment. 415 */ 416struct tcpstat { 417 uint64_t tcps_connattempt; /* connections initiated */ 418 uint64_t tcps_accepts; /* connections accepted */ 419 uint64_t tcps_connects; /* connections established */ 420 uint64_t tcps_drops; /* connections dropped */ 421 uint64_t tcps_conndrops; /* embryonic connections dropped */ 422 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 423 uint64_t tcps_closed; /* conn. closed (includes drops) */ 424 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 425 uint64_t tcps_rttupdated; /* times we succeeded */ 426 uint64_t tcps_delack; /* delayed acks sent */ 427 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 428 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 429 uint64_t tcps_persisttimeo; /* persist timeouts */ 430 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 431 uint64_t tcps_keepprobe; /* keepalive probes sent */ 432 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 433 434 uint64_t tcps_sndtotal; /* total packets sent */ 435 uint64_t tcps_sndpack; /* data packets sent */ 436 uint64_t tcps_sndbyte; /* data bytes sent */ 437 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 438 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 439 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 440 uint64_t tcps_sndacks; /* ack-only packets sent */ 441 uint64_t tcps_sndprobe; /* window probes sent */ 442 uint64_t tcps_sndurg; /* packets sent with URG only */ 443 uint64_t tcps_sndwinup; /* window update-only packets sent */ 444 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 445 446 uint64_t tcps_rcvtotal; /* total packets received */ 447 uint64_t tcps_rcvpack; /* packets received in sequence */ 448 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 449 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 450 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 451 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 452 uint64_t tcps_rcvshort; /* packets received too short */ 453 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 454 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 455 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 456 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 457 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 458 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 459 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 460 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 461 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 462 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 463 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 464 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 465 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 466 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 467 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 468 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 469 uint64_t tcps_predack; /* times hdr predict ok for acks */ 470 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 471 uint64_t tcps_pcbcachemiss; 472 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 473 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 474 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 475 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 476 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 477 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 478 uint64_t tcps_persistdrop; /* timeout in persist state */ 479 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 480 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 481 uint64_t tcps_listendrop; /* listen queue overflows */ 482 uint64_t tcps_badrst; /* ignored RSTs in the window */ 483 484 uint64_t tcps_sc_added; /* entry added to syncache */ 485 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 486 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 487 uint64_t tcps_sc_dropped; /* could not reply to packet */ 488 uint64_t tcps_sc_completed; /* successful extraction of entry */ 489 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 490 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 491 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 492 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 493 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 494 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 495 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 496 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 497 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 498 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 499 500 uint64_t tcps_hc_added; /* entry added to hostcache */ 501 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 502 503 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 504 505 /* SACK related stats */ 506 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 507 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 508 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 509 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 510 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 511 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 512 513 /* ECN related stats */ 514 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 515 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 516 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 517 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 518 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 519 520 /* TCP_SIGNATURE related stats */ 521 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 522 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 523 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */ 524 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 525 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 526 527 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 528}; 529 530#define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 531 532#ifdef _KERNEL 533#include <sys/counter.h> 534 535VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 536/* 537 * In-kernel consumers can use these accessor macros directly to update 538 * stats. 539 */ 540#define TCPSTAT_ADD(name, val) \ 541 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 542#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 543 544/* 545 * Kernel module consumers must use this accessor macro. 546 */ 547void kmod_tcpstat_inc(int statnum); 548#define KMOD_TCPSTAT_INC(name) \ 549 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 550 551/* 552 * TCP specific helper hook point identifiers. 553 */ 554#define HHOOK_TCP_EST_IN 0 555#define HHOOK_TCP_EST_OUT 1 556#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 557 558struct tcp_hhook_data { 559 struct tcpcb *tp; 560 struct tcphdr *th; 561 struct tcpopt *to; 562 long len; 563 int tso; 564 tcp_seq curack; 565}; 566#endif 567 568/* 569 * TCB structure exported to user-land via sysctl(3). 570 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 571 * included. Not all of our clients do. 572 */ 573#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 574struct xtcp_timer { 575 int tt_rexmt; /* retransmit timer */ 576 int tt_persist; /* retransmit persistence */ 577 int tt_keep; /* keepalive */ 578 int tt_2msl; /* 2*msl TIME_WAIT timer */ 579 int tt_delack; /* delayed ACK timer */ 580 int t_rcvtime; /* Time since last packet received */ 581}; 582struct xtcpcb { 583 size_t xt_len; 584 struct inpcb xt_inp; 585 struct tcpcb xt_tp; 586 struct xsocket xt_socket; 587 struct xtcp_timer xt_timer; 588 u_quad_t xt_alignment_hack; 589}; 590#endif 591 592/* 593 * Identifiers for TCP sysctl nodes 594 */ 595#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 596#define TCPCTL_MSSDFLT 3 /* MSS default */ 597#define TCPCTL_STATS 4 /* statistics (read-only) */ 598#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 599#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 600#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 601#define TCPCTL_SENDSPACE 8 /* send buffer space */ 602#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 603#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 604#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 605#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 606#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 607#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 608#define TCPCTL_DROP 15 /* drop tcp connection */ 609 610#ifdef _KERNEL 611#ifdef SYSCTL_DECL 612SYSCTL_DECL(_net_inet_tcp); 613SYSCTL_DECL(_net_inet_tcp_sack); 614MALLOC_DECLARE(M_TCPLOG); 615#endif 616 617VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 618VNET_DECLARE(struct inpcbinfo, tcbinfo); 619extern int tcp_log_in_vain; 620VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 621VNET_DECLARE(int, tcp_minmss); 622VNET_DECLARE(int, tcp_delack_enabled); 623VNET_DECLARE(int, tcp_do_rfc3390); 624VNET_DECLARE(int, tcp_do_initcwnd10); 625VNET_DECLARE(int, tcp_sendspace); 626VNET_DECLARE(int, tcp_recvspace); 627VNET_DECLARE(int, path_mtu_discovery); 628VNET_DECLARE(int, tcp_do_rfc3465); 629VNET_DECLARE(int, tcp_abc_l_var); 630#define V_tcb VNET(tcb) 631#define V_tcbinfo VNET(tcbinfo) 632#define V_tcp_mssdflt VNET(tcp_mssdflt) 633#define V_tcp_minmss VNET(tcp_minmss) 634#define V_tcp_delack_enabled VNET(tcp_delack_enabled) 635#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 636#define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10) 637#define V_tcp_sendspace VNET(tcp_sendspace) 638#define V_tcp_recvspace VNET(tcp_recvspace) 639#define V_path_mtu_discovery VNET(path_mtu_discovery) 640#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 641#define V_tcp_abc_l_var VNET(tcp_abc_l_var) 642 643VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 644VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 645#define V_tcp_do_sack VNET(tcp_do_sack) 646#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 647 648VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 649VNET_DECLARE(int, tcp_ecn_maxretries); 650#define V_tcp_do_ecn VNET(tcp_do_ecn) 651#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 652 653VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 654#define V_tcp_hhh VNET(tcp_hhh) 655 656int tcp_addoptions(struct tcpopt *, u_char *); 657int tcp_ccalgounload(struct cc_algo *unload_algo); 658struct tcpcb * 659 tcp_close(struct tcpcb *); 660void tcp_discardcb(struct tcpcb *); 661void tcp_twstart(struct tcpcb *); 662void tcp_twclose(struct tcptw *, int); 663void tcp_ctlinput(int, struct sockaddr *, void *); 664int tcp_ctloutput(struct socket *, struct sockopt *); 665struct tcpcb * 666 tcp_drop(struct tcpcb *, int); 667void tcp_drain(void); 668void tcp_init(void); 669#ifdef VIMAGE 670void tcp_destroy(void); 671#endif 672void tcp_fini(void *); 673char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 674 const void *); 675char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 676 const void *); 677int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 678void tcp_reass_global_init(void); 679void tcp_reass_flush(struct tcpcb *); 680int tcp_input(struct mbuf **, int *, int); 681u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 682u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 683void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 684 struct tcp_ifcap *); 685void tcp_mss(struct tcpcb *, int); 686int tcp_mssopt(struct in_conninfo *); 687struct inpcb * 688 tcp_drop_syn_sent(struct inpcb *, int); 689struct tcpcb * 690 tcp_newtcpcb(struct inpcb *); 691int tcp_output(struct tcpcb *); 692void tcp_state_change(struct tcpcb *, int); 693void tcp_respond(struct tcpcb *, void *, 694 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 695void tcp_tw_init(void); 696#ifdef VIMAGE 697void tcp_tw_destroy(void); 698#endif 699void tcp_tw_zone_change(void); 700int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 701 struct mbuf *, int); 702void tcp_setpersist(struct tcpcb *); 703#ifdef TCP_SIGNATURE 704struct secasvar; 705struct secasvar *tcp_get_sav(struct mbuf *, u_int); 706int tcp_signature_do_compute(struct mbuf *, int, int, u_char *, 707 struct secasvar *); 708int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 709int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *, 710 struct tcphdr *, u_int); 711int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen, 712 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag); 713#endif 714void tcp_slowtimo(void); 715struct tcptemp * 716 tcpip_maketemplate(struct inpcb *); 717void tcpip_fillheaders(struct inpcb *, void *, void *); 718void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 719int tcp_timer_active(struct tcpcb *, uint32_t); 720void tcp_timer_stop(struct tcpcb *, uint32_t); 721void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 722/* 723 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 724 */ 725void tcp_hc_init(void); 726#ifdef VIMAGE 727void tcp_hc_destroy(void); 728#endif 729void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 730u_long tcp_hc_getmtu(struct in_conninfo *); 731void tcp_hc_updatemtu(struct in_conninfo *, u_long); 732void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 733 734extern struct pr_usrreqs tcp_usrreqs; 735tcp_seq tcp_new_isn(struct tcpcb *); 736 737void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 738void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 739void tcp_clean_sackreport(struct tcpcb *tp); 740void tcp_sack_adjust(struct tcpcb *tp); 741struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 742void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 743void tcp_free_sackholes(struct tcpcb *tp); 744int tcp_newreno(struct tcpcb *, struct tcphdr *); 745u_long tcp_seq_subtract(u_long, u_long ); 746 747void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 748 749static inline void 750tcp_fields_to_host(struct tcphdr *th) 751{ 752 753 th->th_seq = ntohl(th->th_seq); 754 th->th_ack = ntohl(th->th_ack); 755 th->th_win = ntohs(th->th_win); 756 th->th_urp = ntohs(th->th_urp); 757} 758 759#ifdef TCP_SIGNATURE 760static inline void 761tcp_fields_to_net(struct tcphdr *th) 762{ 763 764 th->th_seq = htonl(th->th_seq); 765 th->th_ack = htonl(th->th_ack); 766 th->th_win = htons(th->th_win); 767 th->th_urp = htons(th->th_urp); 768} 769#endif 770#endif /* _KERNEL */ 771 772#endif /* _NETINET_TCP_VAR_H_ */
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