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29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
33 #ifndef _NETINET_TCP_VAR_H_
34 #define _NETINET_TCP_VAR_H_
36 #include <netinet/tcp.h>
41 * Kernel variables for tcp.
44 extern int tcp_do_rfc1323;
47 /* TCP segment queue entry */
49 LIST_ENTRY(tseg_qent) tqe_q;
50 int tqe_len; /* TCP segment data length */
51 struct tcphdr *tqe_th; /* a pointer to tcp header */
52 struct mbuf *tqe_m; /* mbuf contains packet */
54 LIST_HEAD(tsegqe_head, tseg_qent);
56 extern int tcp_reass_qsize;
58 extern struct uma_zone *tcp_reass_zone;
61 tcp_seq start; /* start seq no. of sack block */
62 tcp_seq end; /* end seq no. */
66 tcp_seq start; /* start seq no. of hole */
67 tcp_seq end; /* end seq no. */
68 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
69 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
73 struct sackhole *nexthole;
74 int sack_bytes_rexmit;
78 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
82 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
84 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
86 #define ND6_HINT(tp) \
88 if ((tp) && (tp)->t_inpcb && \
89 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \
90 nd6_nud_hint(NULL, NULL, 0); \
97 * Tcp control block, one per tcp; fields:
98 * Organized for 16 byte cacheline efficiency.
101 struct tsegqe_head t_segq; /* segment reassembly queue */
102 int t_segqlen; /* segment reassembly queue length */
103 int t_dupacks; /* consecutive dup acks recd */
105 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
107 struct inpcb *t_inpcb; /* back pointer to internet pcb */
108 int t_state; /* state of this connection */
111 struct vnet *t_vnet; /* back pointer to parent vnet */
113 tcp_seq snd_una; /* send unacknowledged */
114 tcp_seq snd_max; /* highest sequence number sent;
115 * used to recognize retransmits
117 tcp_seq snd_nxt; /* send next */
118 tcp_seq snd_up; /* send urgent pointer */
120 tcp_seq snd_wl1; /* window update seg seq number */
121 tcp_seq snd_wl2; /* window update seg ack number */
122 tcp_seq iss; /* initial send sequence number */
123 tcp_seq irs; /* initial receive sequence number */
125 tcp_seq rcv_nxt; /* receive next */
126 tcp_seq rcv_adv; /* advertised window */
127 u_long rcv_wnd; /* receive window */
128 tcp_seq rcv_up; /* receive urgent pointer */
130 u_long snd_wnd; /* send window */
131 u_long snd_cwnd; /* congestion-controlled window */
132 u_long snd_bwnd; /* bandwidth-controlled window */
133 u_long snd_ssthresh; /* snd_cwnd size threshold for
134 * for slow start exponential to
137 u_long snd_bandwidth; /* calculated bandwidth or 0 */
138 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
140 u_int t_maxopd; /* mss plus options */
142 int t_rcvtime; /* inactivity time */
143 int t_starttime; /* time connection was established */
144 int t_rtttime; /* round trip time */
145 tcp_seq t_rtseq; /* sequence number being timed */
147 int t_bw_rtttime; /* used for bandwidth calculation */
148 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
150 int t_rxtcur; /* current retransmit value (ticks) */
151 u_int t_maxseg; /* maximum segment size */
152 int t_srtt; /* smoothed round-trip time */
153 int t_rttvar; /* variance in round-trip time */
155 int t_rxtshift; /* log(2) of rexmt exp. backoff */
156 u_int t_rttmin; /* minimum rtt allowed */
157 u_int t_rttbest; /* best rtt we've seen */
158 u_long t_rttupdated; /* number of times rtt sampled */
159 u_long max_sndwnd; /* largest window peer has offered */
161 int t_softerror; /* possible error not yet reported */
162 /* out-of-band data */
163 char t_oobflags; /* have some */
164 char t_iobc; /* input character */
165 /* RFC 1323 variables */
166 u_char snd_scale; /* window scaling for send window */
167 u_char rcv_scale; /* window scaling for recv window */
168 u_char request_r_scale; /* pending window scaling */
169 u_int32_t ts_recent; /* timestamp echo data */
170 int ts_recent_age; /* when last updated */
171 u_int32_t ts_offset; /* our timestamp offset */
173 tcp_seq last_ack_sent;
175 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
176 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
177 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
178 int t_badrxtwin; /* window for retransmit recovery */
179 u_char snd_limited; /* segments limited transmitted */
180 /* SACK related state */
181 int snd_numholes; /* number of holes seen by sender */
182 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
183 /* SACK scoreboard (sorted) */
184 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
185 int rcv_numsacks; /* # distinct sack blks present */
186 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
187 tcp_seq sack_newdata; /* New data xmitted in this recovery
188 episode starts at this seq number */
189 struct sackhint sackhint; /* SACK scoreboard hint */
190 int t_rttlow; /* smallest observerved RTT */
191 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
192 int rfbuf_cnt; /* recv buffer autoscaling byte count */
193 void *t_pspare[3]; /* toe usrreqs / toepcb * / congestion algo / 1 general use */
194 struct toe_usrreqs *t_tu; /* offload operations vector */
195 void *t_toe; /* TOE pcb pointer */
196 int t_bytes_acked; /* # bytes acked during current RTT */
200 * Flags and utility macros for the t_flags field.
202 #define TF_ACKNOW 0x000001 /* ack peer immediately */
203 #define TF_DELACK 0x000002 /* ack, but try to delay it */
204 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
205 #define TF_NOOPT 0x000008 /* don't use tcp options */
206 #define TF_SENTFIN 0x000010 /* have sent FIN */
207 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
208 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
209 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
210 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
211 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
212 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
213 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
214 #define TF_NOPUSH 0x001000 /* don't push */
215 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
216 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
217 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
218 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
219 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
220 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
221 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
222 #define TF_FORCEDATA 0x800000 /* force out a byte */
223 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
224 #define TF_TOE 0x2000000 /* this connection is offloaded */
225 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
226 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
227 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
229 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
230 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
231 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
234 * Flags for the t_oobflags field.
236 #define TCPOOB_HAVEDATA 0x01
237 #define TCPOOB_HADDATA 0x02
241 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
242 * for SADB verification and lookup.
244 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
245 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
246 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
248 * Only a single SA per host may be specified at this time. An SPI is
249 * needed in order for the KEY_ALLOCSA() lookup to work.
251 #define TCP_SIG_SPI 0x1000
252 #endif /* TCP_SIGNATURE */
255 * Structure to hold TCP options that are only used during segment
256 * processing (in tcp_input), but not held in the tcpcb.
257 * It's basically used to reduce the number of parameters
258 * to tcp_dooptions and tcp_addoptions.
259 * The binary order of the to_flags is relevant for packing of the
260 * options in tcp_addoptions.
263 u_long to_flags; /* which options are present */
264 #define TOF_MSS 0x0001 /* maximum segment size */
265 #define TOF_SCALE 0x0002 /* window scaling */
266 #define TOF_SACKPERM 0x0004 /* SACK permitted */
267 #define TOF_TS 0x0010 /* timestamp */
268 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
269 #define TOF_SACK 0x0080 /* Peer sent SACK option */
270 #define TOF_MAXOPT 0x0100
271 u_int32_t to_tsval; /* new timestamp */
272 u_int32_t to_tsecr; /* reflected timestamp */
273 u_int16_t to_mss; /* maximum segment size */
274 u_int8_t to_wscale; /* window scaling */
275 u_int8_t to_nsacks; /* number of SACK blocks */
276 u_char *to_sacks; /* pointer to the first SACK blocks */
277 u_char *to_signature; /* pointer to the TCP-MD5 signature */
281 * Flags for tcp_dooptions.
283 #define TO_SYN 0x01 /* parse SYN-only options */
285 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
286 u_long rmx_mtu; /* MTU for this path */
287 u_long rmx_ssthresh; /* outbound gateway buffer limit */
288 u_long rmx_rtt; /* estimated round trip time */
289 u_long rmx_rttvar; /* estimated rtt variance */
290 u_long rmx_bandwidth; /* estimated bandwidth */
291 u_long rmx_cwnd; /* congestion window */
292 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
293 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
296 #ifndef _NETINET_IN_PCB_H_
298 #endif /* _NETINET_IN_PCB_H_ */
301 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
306 u_short last_win; /* cached window value */
307 u_short tw_so_options; /* copy of so_options */
308 struct ucred *tw_cred; /* user credentials */
310 u_int32_t ts_offset; /* our timestamp offset */
313 TAILQ_ENTRY(tcptw) tw_2msl;
316 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
317 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
318 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
321 * The smoothed round-trip time and estimated variance
322 * are stored as fixed point numbers scaled by the values below.
323 * For convenience, these scales are also used in smoothing the average
324 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
325 * With these scales, srtt has 3 bits to the right of the binary point,
326 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
327 * binary point, and is smoothed with an ALPHA of 0.75.
329 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
330 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
331 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
332 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
333 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
336 * The initial retransmission should happen at rtt + 4 * rttvar.
337 * Because of the way we do the smoothing, srtt and rttvar
338 * will each average +1/2 tick of bias. When we compute
339 * the retransmit timer, we want 1/2 tick of rounding and
340 * 1 extra tick because of +-1/2 tick uncertainty in the
341 * firing of the timer. The bias will give us exactly the
342 * 1.5 tick we need. But, because the bias is
343 * statistical, we have to test that we don't drop below
344 * the minimum feasible timer (which is 2 ticks).
345 * This version of the macro adapted from a paper by Lawrence
346 * Brakmo and Larry Peterson which outlines a problem caused
347 * by insufficient precision in the original implementation,
348 * which results in inappropriately large RTO values for very
351 #define TCP_REXMTVAL(tp) \
352 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
353 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
357 * Many of these should be kept per connection,
358 * but that's inconvenient at the moment.
361 u_long tcps_connattempt; /* connections initiated */
362 u_long tcps_accepts; /* connections accepted */
363 u_long tcps_connects; /* connections established */
364 u_long tcps_drops; /* connections dropped */
365 u_long tcps_conndrops; /* embryonic connections dropped */
366 u_long tcps_minmssdrops; /* average minmss too low drops */
367 u_long tcps_closed; /* conn. closed (includes drops) */
368 u_long tcps_segstimed; /* segs where we tried to get rtt */
369 u_long tcps_rttupdated; /* times we succeeded */
370 u_long tcps_delack; /* delayed acks sent */
371 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
372 u_long tcps_rexmttimeo; /* retransmit timeouts */
373 u_long tcps_persisttimeo; /* persist timeouts */
374 u_long tcps_keeptimeo; /* keepalive timeouts */
375 u_long tcps_keepprobe; /* keepalive probes sent */
376 u_long tcps_keepdrops; /* connections dropped in keepalive */
378 u_long tcps_sndtotal; /* total packets sent */
379 u_long tcps_sndpack; /* data packets sent */
380 u_long tcps_sndbyte; /* data bytes sent */
381 u_long tcps_sndrexmitpack; /* data packets retransmitted */
382 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
383 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */
384 u_long tcps_sndacks; /* ack-only packets sent */
385 u_long tcps_sndprobe; /* window probes sent */
386 u_long tcps_sndurg; /* packets sent with URG only */
387 u_long tcps_sndwinup; /* window update-only packets sent */
388 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
390 u_long tcps_rcvtotal; /* total packets received */
391 u_long tcps_rcvpack; /* packets received in sequence */
392 u_long tcps_rcvbyte; /* bytes received in sequence */
393 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
394 u_long tcps_rcvbadoff; /* packets received with bad offset */
395 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
396 u_long tcps_rcvshort; /* packets received too short */
397 u_long tcps_rcvduppack; /* duplicate-only packets received */
398 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
399 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
400 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
401 u_long tcps_rcvoopack; /* out-of-order packets received */
402 u_long tcps_rcvoobyte; /* out-of-order bytes received */
403 u_long tcps_rcvpackafterwin; /* packets with data after window */
404 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
405 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
406 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
407 u_long tcps_rcvdupack; /* rcvd duplicate acks */
408 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
409 u_long tcps_rcvackpack; /* rcvd ack packets */
410 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
411 u_long tcps_rcvwinupd; /* rcvd window update packets */
412 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
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_badrst; /* ignored RSTs in the window */
428 u_long tcps_sc_added; /* entry added to syncache */
429 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
430 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
431 u_long tcps_sc_dropped; /* could not reply to packet */
432 u_long tcps_sc_completed; /* successful extraction of entry */
433 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
434 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
435 u_long tcps_sc_reset; /* RST removed entry from syncache */
436 u_long tcps_sc_stale; /* timed out or listen socket gone */
437 u_long tcps_sc_aborted; /* syncache entry aborted */
438 u_long tcps_sc_badack; /* removed due to bad ACK */
439 u_long tcps_sc_unreach; /* ICMP unreachable received */
440 u_long tcps_sc_zonefail; /* zalloc() failed */
441 u_long tcps_sc_sendcookie; /* SYN cookie sent */
442 u_long tcps_sc_recvcookie; /* SYN cookie received */
444 u_long tcps_hc_added; /* entry added to hostcache */
445 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
447 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
449 /* SACK related stats */
450 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */
451 u_long tcps_sack_rexmits; /* SACK rexmit segments */
452 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
453 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */
454 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */
455 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */
457 /* ECN related stats */
458 u_long tcps_ecn_ce; /* ECN Congestion Experienced */
459 u_long tcps_ecn_ect0; /* ECN Capable Transport */
460 u_long tcps_ecn_ect1; /* ECN Capable Transport */
461 u_long tcps_ecn_shs; /* ECN successful handshakes */
462 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
466 #define TCPSTAT_ADD(name, val) V_tcpstat.name += (val)
467 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
471 * TCB structure exported to user-land via sysctl(3).
472 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
473 * included. Not all of our clients do.
475 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
480 struct xsocket xt_socket;
481 u_quad_t xt_alignment_hack;
486 * Names for TCP sysctl objects
488 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
489 #define TCPCTL_MSSDFLT 3 /* MSS default */
490 #define TCPCTL_STATS 4 /* statistics (read-only) */
491 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
492 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
493 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
494 #define TCPCTL_SENDSPACE 8 /* send buffer space */
495 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
496 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
497 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
498 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
499 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
500 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
501 #define TCPCTL_DROP 15 /* drop tcp connection */
502 #define TCPCTL_MAXID 16
503 #define TCPCTL_FINWAIT2_TIMEOUT 17
505 #define TCPCTL_NAMES { \
507 { "rfc1323", CTLTYPE_INT }, \
508 { "mssdflt", CTLTYPE_INT }, \
509 { "stats", CTLTYPE_STRUCT }, \
510 { "rttdflt", CTLTYPE_INT }, \
511 { "keepidle", CTLTYPE_INT }, \
512 { "keepintvl", CTLTYPE_INT }, \
513 { "sendspace", CTLTYPE_INT }, \
514 { "recvspace", CTLTYPE_INT }, \
515 { "keepinit", CTLTYPE_INT }, \
516 { "pcblist", CTLTYPE_STRUCT }, \
517 { "delacktime", CTLTYPE_INT }, \
518 { "v6mssdflt", CTLTYPE_INT }, \
519 { "maxid", CTLTYPE_INT }, \
525 SYSCTL_DECL(_net_inet_tcp);
526 SYSCTL_DECL(_net_inet_tcp_sack);
527 MALLOC_DECLARE(M_TCPLOG);
530 extern int tcp_log_in_vain;
532 #ifdef VIMAGE_GLOBALS
533 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
534 extern struct inpcbinfo tcbinfo;
535 extern struct tcpstat tcpstat; /* tcp statistics */
536 extern int tcp_mssdflt; /* XXX */
537 extern int tcp_minmss;
538 extern int tcp_delack_enabled;
539 extern int tcp_do_newreno;
540 extern int path_mtu_discovery;
542 extern int ss_fltsz_local;
544 extern int blackhole;
545 extern int drop_synfin;
546 extern int tcp_do_rfc3042;
547 extern int tcp_do_rfc3390;
548 extern int tcp_insecure_rst;
549 extern int tcp_do_autorcvbuf;
550 extern int tcp_autorcvbuf_inc;
551 extern int tcp_autorcvbuf_max;
552 extern int tcp_do_rfc3465;
553 extern int tcp_abc_l_var;
555 extern int tcp_do_tso;
556 extern int tcp_do_autosndbuf;
557 extern int tcp_autosndbuf_inc;
558 extern int tcp_autosndbuf_max;
560 extern int nolocaltimewait;
562 extern int tcp_do_sack; /* SACK enabled/disabled */
563 extern int tcp_sack_maxholes;
564 extern int tcp_sack_globalmaxholes;
565 extern int tcp_sack_globalholes;
566 extern int tcp_sc_rst_sock_fail; /* RST on sock alloc failure */
567 extern int tcp_do_ecn; /* TCP ECN enabled/disabled */
568 extern int tcp_ecn_maxretries;
569 #endif /* VIMAGE_GLOBALS */
571 int tcp_addoptions(struct tcpopt *, u_char *);
573 tcp_close(struct tcpcb *);
574 void tcp_discardcb(struct tcpcb *);
575 void tcp_twstart(struct tcpcb *);
577 int tcp_twrecycleable(struct tcptw *tw);
579 void tcp_twclose(struct tcptw *_tw, int _reuse);
580 void tcp_ctlinput(int, struct sockaddr *, void *);
581 int tcp_ctloutput(struct socket *, struct sockopt *);
583 tcp_drop(struct tcpcb *, int);
584 void tcp_drain(void);
585 void tcp_fasttimo(void);
588 void tcp_destroy(void);
590 void tcp_fini(void *);
591 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
593 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
594 void tcp_reass_init(void);
595 void tcp_input(struct mbuf *, int);
596 u_long tcp_maxmtu(struct in_conninfo *, int *);
597 u_long tcp_maxmtu6(struct in_conninfo *, int *);
598 void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *);
599 void tcp_mss(struct tcpcb *, int);
600 int tcp_mssopt(struct in_conninfo *);
602 tcp_drop_syn_sent(struct inpcb *, int);
604 tcp_mtudisc(struct inpcb *, int);
606 tcp_newtcpcb(struct inpcb *);
607 int tcp_output(struct tcpcb *);
608 void tcp_respond(struct tcpcb *, void *,
609 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
610 void tcp_tw_init(void);
612 void tcp_tw_destroy(void);
614 void tcp_tw_zone_change(void);
615 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
617 int tcp_twrespond(struct tcptw *, int);
618 void tcp_setpersist(struct tcpcb *);
620 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
622 void tcp_slowtimo(void);
624 tcpip_maketemplate(struct inpcb *);
625 void tcpip_fillheaders(struct inpcb *, void *, void *);
626 void tcp_timer_activate(struct tcpcb *, int, u_int);
627 int tcp_timer_active(struct tcpcb *, int);
628 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
629 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
631 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
633 void tcp_hc_init(void);
635 void tcp_hc_destroy(void);
637 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
638 u_long tcp_hc_getmtu(struct in_conninfo *);
639 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
640 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
642 extern struct pr_usrreqs tcp_usrreqs;
643 extern u_long tcp_sendspace;
644 extern u_long tcp_recvspace;
645 tcp_seq tcp_new_isn(struct tcpcb *);
647 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
648 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
649 void tcp_clean_sackreport(struct tcpcb *tp);
650 void tcp_sack_adjust(struct tcpcb *tp);
651 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
652 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
653 void tcp_free_sackholes(struct tcpcb *tp);
654 int tcp_newreno(struct tcpcb *, struct tcphdr *);
655 u_long tcp_seq_subtract(u_long, u_long );
659 #endif /* _NETINET_TCP_VAR_H_ */