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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>
39 * Kernel variables for tcp.
41 extern int tcp_do_rfc1323;
43 /* TCP segment queue entry */
45 LIST_ENTRY(tseg_qent) tqe_q;
46 int tqe_len; /* TCP segment data length */
47 struct tcphdr *tqe_th; /* a pointer to tcp header */
48 struct mbuf *tqe_m; /* mbuf contains packet */
50 LIST_HEAD(tsegqe_head, tseg_qent);
51 extern int tcp_reass_qsize;
52 extern struct uma_zone *tcp_reass_zone;
55 tcp_seq start; /* start seq no. of sack block */
56 tcp_seq end; /* end seq no. */
60 tcp_seq start; /* start seq no. of hole */
61 tcp_seq end; /* end seq no. */
62 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
63 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
67 struct sackhole *nexthole;
68 int sack_bytes_rexmit;
72 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
76 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
79 * Tcp control block, one per tcp; fields:
80 * Organized for 16 byte cacheline efficiency.
83 struct tsegqe_head t_segq; /* segment reassembly queue */
84 int t_segqlen; /* segment reassembly queue length */
85 int t_dupacks; /* consecutive dup acks recd */
87 struct callout *tt_rexmt; /* retransmit timer */
88 struct callout *tt_persist; /* retransmit persistence */
89 struct callout *tt_keep; /* keepalive */
90 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */
91 struct callout *tt_delack; /* delayed ACK timer */
93 struct inpcb *t_inpcb; /* back pointer to internet pcb */
94 int t_state; /* state of this connection */
96 #define TF_ACKNOW 0x000001 /* ack peer immediately */
97 #define TF_DELACK 0x000002 /* ack, but try to delay it */
98 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
99 #define TF_NOOPT 0x000008 /* don't use tcp options */
100 #define TF_SENTFIN 0x000010 /* have sent FIN */
101 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
102 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
103 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
104 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
105 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
106 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
107 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
108 #define TF_NOPUSH 0x001000 /* don't push */
109 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
110 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
111 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
112 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
113 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
114 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
115 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
116 #define TF_FORCEDATA 0x800000 /* force out a byte */
117 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
119 tcp_seq snd_una; /* send unacknowledged */
120 tcp_seq snd_max; /* highest sequence number sent;
121 * used to recognize retransmits
123 tcp_seq snd_nxt; /* send next */
124 tcp_seq snd_up; /* send urgent pointer */
126 tcp_seq snd_wl1; /* window update seg seq number */
127 tcp_seq snd_wl2; /* window update seg ack number */
128 tcp_seq iss; /* initial send sequence number */
129 tcp_seq irs; /* initial receive sequence number */
131 tcp_seq rcv_nxt; /* receive next */
132 tcp_seq rcv_adv; /* advertised window */
133 u_long rcv_wnd; /* receive window */
134 tcp_seq rcv_up; /* receive urgent pointer */
136 u_long snd_wnd; /* send window */
137 u_long snd_cwnd; /* congestion-controlled window */
138 u_long snd_bwnd; /* bandwidth-controlled window */
139 u_long snd_ssthresh; /* snd_cwnd size threshold for
140 * for slow start exponential to
143 u_long snd_bandwidth; /* calculated bandwidth or 0 */
144 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
146 u_int t_maxopd; /* mss plus options */
148 u_long t_rcvtime; /* inactivity time */
149 u_long t_starttime; /* time connection was established */
150 int t_rtttime; /* round trip time */
151 tcp_seq t_rtseq; /* sequence number being timed */
153 int t_bw_rtttime; /* used for bandwidth calculation */
154 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
156 int t_rxtcur; /* current retransmit value (ticks) */
157 u_int t_maxseg; /* maximum segment size */
158 int t_srtt; /* smoothed round-trip time */
159 int t_rttvar; /* variance in round-trip time */
161 int t_rxtshift; /* log(2) of rexmt exp. backoff */
162 u_int t_rttmin; /* minimum rtt allowed */
163 u_int t_rttbest; /* best rtt we've seen */
164 u_long t_rttupdated; /* number of times rtt sampled */
165 u_long max_sndwnd; /* largest window peer has offered */
167 int t_softerror; /* possible error not yet reported */
168 /* out-of-band data */
169 char t_oobflags; /* have some */
170 char t_iobc; /* input character */
171 #define TCPOOB_HAVEDATA 0x01
172 #define TCPOOB_HADDATA 0x02
173 /* RFC 1323 variables */
174 u_char snd_scale; /* window scaling for send window */
175 u_char rcv_scale; /* window scaling for recv window */
176 u_char request_r_scale; /* pending window scaling */
177 u_char requested_s_scale; /* unused, to be reused later */
178 u_int32_t ts_recent; /* timestamp echo data */
179 u_long ts_recent_age; /* when last updated */
180 u_int32_t ts_offset; /* our timestamp offset */
182 tcp_seq last_ack_sent;
184 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
185 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
186 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
187 u_long t_badrxtwin; /* window for retransmit recovery */
188 u_char snd_limited; /* segments limited transmitted */
189 /* anti DoS counters */
190 u_long rcv_second; /* start of interval second */
191 u_long rcv_pps; /* received packets per second */
192 u_long rcv_byps; /* received bytes per second */
193 /* SACK related state */
194 int sack_enable; /* enable SACK for this connection */
195 int snd_numholes; /* number of holes seen by sender */
196 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
197 /* SACK scoreboard (sorted) */
198 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
199 int rcv_numsacks; /* # distinct sack blks present */
200 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
201 tcp_seq sack_newdata; /* New data xmitted in this recovery
202 episode starts at this seq number */
203 struct sackhint sackhint; /* SACK scoreboard hint */
204 int t_rttlow; /* smallest observerved RTT */
207 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
208 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
209 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
213 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
214 * for SADB verification and lookup.
216 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
217 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
218 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
220 * Only a single SA per host may be specified at this time. An SPI is
221 * needed in order for the KEY_ALLOCSA() lookup to work.
223 #define TCP_SIG_SPI 0x1000
224 #endif /* TCP_SIGNATURE */
227 * Structure to hold TCP options that are only used during segment
228 * processing (in tcp_input), but not held in the tcpcb.
229 * It's basically used to reduce the number of parameters
233 u_long to_flags; /* which options are present */
234 #define TOF_TS 0x0001 /* timestamp */
235 #define TOF_MSS 0x0010 /* maximum segment size */
236 #define TOF_SCALE 0x0020 /* window scaling */
237 #define TOF_SIGNATURE 0x0040 /* signature option present */
238 #define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */
239 #define TOF_SACK 0x0100 /* Peer sent SACK option */
243 u_int8_t to_requested_s_scale;
244 u_int8_t to_nsacks; /* number of SACK blocks */
245 u_char *to_sacks; /* pointer to the first SACK blocks */
249 * Flags for tcp_dooptions.
251 #define TO_SYN 0x01 /* parse SYN-only options */
253 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
254 u_long rmx_mtu; /* MTU for this path */
255 u_long rmx_ssthresh; /* outbound gateway buffer limit */
256 u_long rmx_rtt; /* estimated round trip time */
257 u_long rmx_rttvar; /* estimated rtt variance */
258 u_long rmx_bandwidth; /* estimated bandwidth */
259 u_long rmx_cwnd; /* congestion window */
260 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
261 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
264 #ifndef _NETINET_IN_PCB_H_
266 #endif /* _NETINET_IN_PCB_H_ */
269 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
274 u_short last_win; /* cached window value */
275 u_short tw_so_options; /* copy of so_options */
276 struct ucred *tw_cred; /* user credentials */
280 TAILQ_ENTRY(tcptw) tw_2msl;
283 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
284 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
285 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
288 * The smoothed round-trip time and estimated variance
289 * are stored as fixed point numbers scaled by the values below.
290 * For convenience, these scales are also used in smoothing the average
291 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
292 * With these scales, srtt has 3 bits to the right of the binary point,
293 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
294 * binary point, and is smoothed with an ALPHA of 0.75.
296 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
297 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
298 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
299 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
300 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
303 * The initial retransmission should happen at rtt + 4 * rttvar.
304 * Because of the way we do the smoothing, srtt and rttvar
305 * will each average +1/2 tick of bias. When we compute
306 * the retransmit timer, we want 1/2 tick of rounding and
307 * 1 extra tick because of +-1/2 tick uncertainty in the
308 * firing of the timer. The bias will give us exactly the
309 * 1.5 tick we need. But, because the bias is
310 * statistical, we have to test that we don't drop below
311 * the minimum feasible timer (which is 2 ticks).
312 * This version of the macro adapted from a paper by Lawrence
313 * Brakmo and Larry Peterson which outlines a problem caused
314 * by insufficient precision in the original implementation,
315 * which results in inappropriately large RTO values for very
318 #define TCP_REXMTVAL(tp) \
319 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
320 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
324 * Many of these should be kept per connection,
325 * but that's inconvenient at the moment.
328 u_long tcps_connattempt; /* connections initiated */
329 u_long tcps_accepts; /* connections accepted */
330 u_long tcps_connects; /* connections established */
331 u_long tcps_drops; /* connections dropped */
332 u_long tcps_conndrops; /* embryonic connections dropped */
333 u_long tcps_minmssdrops; /* average minmss too low drops */
334 u_long tcps_closed; /* conn. closed (includes drops) */
335 u_long tcps_segstimed; /* segs where we tried to get rtt */
336 u_long tcps_rttupdated; /* times we succeeded */
337 u_long tcps_delack; /* delayed acks sent */
338 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
339 u_long tcps_rexmttimeo; /* retransmit timeouts */
340 u_long tcps_persisttimeo; /* persist timeouts */
341 u_long tcps_keeptimeo; /* keepalive timeouts */
342 u_long tcps_keepprobe; /* keepalive probes sent */
343 u_long tcps_keepdrops; /* connections dropped in keepalive */
345 u_long tcps_sndtotal; /* total packets sent */
346 u_long tcps_sndpack; /* data packets sent */
347 u_long tcps_sndbyte; /* data bytes sent */
348 u_long tcps_sndrexmitpack; /* data packets retransmitted */
349 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
350 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */
351 u_long tcps_sndacks; /* ack-only packets sent */
352 u_long tcps_sndprobe; /* window probes sent */
353 u_long tcps_sndurg; /* packets sent with URG only */
354 u_long tcps_sndwinup; /* window update-only packets sent */
355 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
357 u_long tcps_rcvtotal; /* total packets received */
358 u_long tcps_rcvpack; /* packets received in sequence */
359 u_long tcps_rcvbyte; /* bytes received in sequence */
360 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
361 u_long tcps_rcvbadoff; /* packets received with bad offset */
362 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
363 u_long tcps_rcvshort; /* packets received too short */
364 u_long tcps_rcvduppack; /* duplicate-only packets received */
365 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
366 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
367 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
368 u_long tcps_rcvoopack; /* out-of-order packets received */
369 u_long tcps_rcvoobyte; /* out-of-order bytes received */
370 u_long tcps_rcvpackafterwin; /* packets with data after window */
371 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
372 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
373 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
374 u_long tcps_rcvdupack; /* rcvd duplicate acks */
375 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
376 u_long tcps_rcvackpack; /* rcvd ack packets */
377 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
378 u_long tcps_rcvwinupd; /* rcvd window update packets */
379 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
380 u_long tcps_predack; /* times hdr predict ok for acks */
381 u_long tcps_preddat; /* times hdr predict ok for data pkts */
382 u_long tcps_pcbcachemiss;
383 u_long tcps_cachedrtt; /* times cached RTT in route updated */
384 u_long tcps_cachedrttvar; /* times cached rttvar updated */
385 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
386 u_long tcps_usedrtt; /* times RTT initialized from route */
387 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
388 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
389 u_long tcps_persistdrop; /* timeout in persist state */
390 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
391 u_long tcps_mturesent; /* resends due to MTU discovery */
392 u_long tcps_listendrop; /* listen queue overflows */
393 u_long tcps_badrst; /* ignored RSTs in the window */
395 u_long tcps_sc_added; /* entry added to syncache */
396 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
397 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
398 u_long tcps_sc_dropped; /* could not reply to packet */
399 u_long tcps_sc_completed; /* successful extraction of entry */
400 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
401 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
402 u_long tcps_sc_reset; /* RST removed entry from syncache */
403 u_long tcps_sc_stale; /* timed out or listen socket gone */
404 u_long tcps_sc_aborted; /* syncache entry aborted */
405 u_long tcps_sc_badack; /* removed due to bad ACK */
406 u_long tcps_sc_unreach; /* ICMP unreachable received */
407 u_long tcps_sc_zonefail; /* zalloc() failed */
408 u_long tcps_sc_sendcookie; /* SYN cookie sent */
409 u_long tcps_sc_recvcookie; /* SYN cookie received */
411 u_long tcps_hc_added; /* entry added to hostcache */
412 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
414 /* SACK related stats */
415 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */
416 u_long tcps_sack_rexmits; /* SACK rexmit segments */
417 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
418 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */
419 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */
420 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */
424 * TCB structure exported to user-land via sysctl(3).
425 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
426 * included. Not all of our clients do.
428 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
433 struct xsocket xt_socket;
434 u_quad_t xt_alignment_hack;
439 * Names for TCP sysctl objects
441 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
442 #define TCPCTL_MSSDFLT 3 /* MSS default */
443 #define TCPCTL_STATS 4 /* statistics (read-only) */
444 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
445 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
446 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
447 #define TCPCTL_SENDSPACE 8 /* send buffer space */
448 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
449 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
450 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
451 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
452 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
453 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
454 #define TCPCTL_DROP 15 /* drop tcp connection */
455 #define TCPCTL_MAXID 16
457 #define TCPCTL_NAMES { \
459 { "rfc1323", CTLTYPE_INT }, \
460 { "mssdflt", CTLTYPE_INT }, \
461 { "stats", CTLTYPE_STRUCT }, \
462 { "rttdflt", CTLTYPE_INT }, \
463 { "keepidle", CTLTYPE_INT }, \
464 { "keepintvl", CTLTYPE_INT }, \
465 { "sendspace", CTLTYPE_INT }, \
466 { "recvspace", CTLTYPE_INT }, \
467 { "keepinit", CTLTYPE_INT }, \
468 { "pcblist", CTLTYPE_STRUCT }, \
469 { "delacktime", CTLTYPE_INT }, \
470 { "v6mssdflt", CTLTYPE_INT }, \
471 { "maxid", CTLTYPE_INT }, \
477 SYSCTL_DECL(_net_inet_tcp);
478 SYSCTL_DECL(_net_inet_tcp_sack);
481 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
482 extern struct inpcbinfo tcbinfo;
483 extern struct tcpstat tcpstat; /* tcp statistics */
484 extern int tcp_mssdflt; /* XXX */
485 extern int tcp_minmss;
486 extern int tcp_minmssoverload;
487 extern int tcp_delack_enabled;
488 extern int tcp_do_newreno;
489 extern int path_mtu_discovery;
491 extern int ss_fltsz_local;
493 extern int tcp_do_sack; /* SACK enabled/disabled */
496 tcp_close(struct tcpcb *);
497 void tcp_discardcb(struct tcpcb *);
498 void tcp_twstart(struct tcpcb *);
500 int tcp_twrecycleable(struct tcptw *tw);
502 void tcp_twclose(struct tcptw *_tw, int _reuse);
503 void tcp_ctlinput(int, struct sockaddr *, void *);
504 int tcp_ctloutput(struct socket *, struct sockopt *);
506 tcp_drop(struct tcpcb *, int);
507 void tcp_drain(void);
508 void tcp_fasttimo(void);
510 void tcp_fini(void *);
511 void tcp_reass_init(void);
512 void tcp_input(struct mbuf *, int);
513 u_long tcp_maxmtu(struct in_conninfo *, int *);
514 u_long tcp_maxmtu6(struct in_conninfo *, int *);
515 void tcp_mss(struct tcpcb *, int);
516 int tcp_mssopt(struct in_conninfo *);
518 tcp_drop_syn_sent(struct inpcb *, int);
520 tcp_mtudisc(struct inpcb *, int);
522 tcp_newtcpcb(struct inpcb *);
523 int tcp_output(struct tcpcb *);
524 void tcp_respond(struct tcpcb *, void *,
525 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
526 int tcp_twrespond(struct tcptw *, int);
527 void tcp_setpersist(struct tcpcb *);
529 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
531 void tcp_slowtimo(void);
533 tcpip_maketemplate(struct inpcb *);
534 void tcpip_fillheaders(struct inpcb *, void *, void *);
536 tcp_timers(struct tcpcb *, int);
537 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int);
538 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
539 void syncache_init(void);
540 void syncache_unreach(struct in_conninfo *, struct tcphdr *);
541 int syncache_expand(struct in_conninfo *, struct tcpopt *,
542 struct tcphdr *, struct socket **, struct mbuf *);
543 int syncache_add(struct in_conninfo *, struct tcpopt *,
544 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *);
545 void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
546 void syncache_badack(struct in_conninfo *);
548 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
550 void tcp_hc_init(void);
551 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
552 u_long tcp_hc_getmtu(struct in_conninfo *);
553 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
554 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
556 extern struct pr_usrreqs tcp_usrreqs;
557 extern u_long tcp_sendspace;
558 extern u_long tcp_recvspace;
559 tcp_seq tcp_new_isn(struct tcpcb *);
561 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
562 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
563 void tcp_clean_sackreport(struct tcpcb *tp);
564 void tcp_sack_adjust(struct tcpcb *tp);
565 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
566 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
567 void tcp_free_sackholes(struct tcpcb *tp);
568 int tcp_newreno(struct tcpcb *, struct tcphdr *);
569 u_long tcp_seq_subtract(u_long, u_long );
573 #endif /* _NETINET_TCP_VAR_H_ */