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
|
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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