FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_var.h
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
34 * $FreeBSD$
35 */
36
37 #ifndef _NETINET_TCP_VAR_H_
38 #define _NETINET_TCP_VAR_H_
39
40 #include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */
41
42 /*
43 * Kernel variables for tcp.
44 */
45 extern int tcp_do_rfc1323;
46 extern int tcp_do_rfc1644;
47
48 /* TCP segment queue entry */
49 struct tseg_qent {
50 LIST_ENTRY(tseg_qent) tqe_q;
51 int tqe_len; /* TCP segment data length */
52 struct tcphdr *tqe_th; /* a pointer to tcp header */
53 struct mbuf *tqe_m; /* mbuf contains packet */
54 };
55 LIST_HEAD(tsegqe_head, tseg_qent);
56 extern int tcp_reass_maxseg;
57 extern int tcp_reass_qsize;
58 #ifdef MALLOC_DECLARE
59 MALLOC_DECLARE(M_TSEGQ);
60 #endif
61
62 struct tcptemp {
63 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
64 struct tcphdr tt_t;
65 };
66
67 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
68
69 /*
70 * Tcp control block, one per tcp; fields:
71 * Organized for 16 byte cacheline efficiency.
72 */
73 struct tcpcb {
74 struct tsegqe_head t_segq;
75 int t_dupacks; /* consecutive dup acks recd */
76 struct tcptemp *unused; /* unused */
77
78 struct callout *tt_rexmt; /* retransmit timer */
79 struct callout *tt_persist; /* retransmit persistence */
80 struct callout *tt_keep; /* keepalive */
81 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */
82 struct callout *tt_delack; /* delayed ACK timer */
83
84 struct inpcb *t_inpcb; /* back pointer to internet pcb */
85 int t_state; /* state of this connection */
86 u_int t_flags;
87 #define TF_ACKNOW 0x00001 /* ack peer immediately */
88 #define TF_DELACK 0x00002 /* ack, but try to delay it */
89 #define TF_NODELAY 0x00004 /* don't delay packets to coalesce */
90 #define TF_NOOPT 0x00008 /* don't use tcp options */
91 #define TF_SENTFIN 0x00010 /* have sent FIN */
92 #define TF_REQ_SCALE 0x00020 /* have/will request window scaling */
93 #define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */
94 #define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */
95 #define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */
96 #define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */
97 #define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */
98 #define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */
99 #define TF_NOPUSH 0x01000 /* don't push */
100 #define TF_REQ_CC 0x02000 /* have/will request CC */
101 #define TF_RCVD_CC 0x04000 /* a CC was received in SYN */
102 #define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */
103 #define TF_MORETOCOME 0x10000 /* More data to be appended to sock */
104 #define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */
105 #define TF_LASTIDLE 0x40000 /* connection was previously idle */
106 #define TF_RXWIN0SENT 0x80000 /* sent a receiver win 0 in response */
107 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
108 int t_force; /* 1 if forcing out a byte */
109
110 tcp_seq snd_una; /* send unacknowledged */
111 tcp_seq snd_max; /* highest sequence number sent;
112 * used to recognize retransmits
113 */
114 tcp_seq snd_nxt; /* send next */
115 tcp_seq snd_up; /* send urgent pointer */
116
117 tcp_seq snd_wl1; /* window update seg seq number */
118 tcp_seq snd_wl2; /* window update seg ack number */
119 tcp_seq iss; /* initial send sequence number */
120 tcp_seq irs; /* initial receive sequence number */
121
122 tcp_seq rcv_nxt; /* receive next */
123 tcp_seq rcv_adv; /* advertised window */
124 u_long rcv_wnd; /* receive window */
125 tcp_seq rcv_up; /* receive urgent pointer */
126
127 u_long snd_wnd; /* send window */
128 u_long snd_cwnd; /* congestion-controlled window */
129 u_long snd_bwnd; /* bandwidth-controlled window */
130 u_long snd_ssthresh; /* snd_cwnd size threshold for
131 * for slow start exponential to
132 * linear switch
133 */
134 u_long snd_bandwidth; /* calculated bandwidth or 0 */
135 tcp_seq snd_recover; /* for use in NewReno fast recovery */
136 tcp_seq snd_high; /* for use in NewReno Fast Recovery */
137
138 u_int t_maxopd; /* mss plus options */
139
140 u_long t_rcvtime; /* inactivity time */
141 u_long t_starttime; /* time connection was established */
142 int t_rtttime; /* round trip time */
143 tcp_seq t_rtseq; /* sequence number being timed */
144
145 int t_bw_rtttime; /* used for bandwidth calculation */
146 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
147
148 int t_rxtcur; /* current retransmit value (ticks) */
149 u_int t_maxseg; /* maximum segment size */
150 int t_srtt; /* smoothed round-trip time */
151 int t_rttvar; /* variance in round-trip time */
152
153 int t_rxtshift; /* log(2) of rexmt exp. backoff */
154 u_int t_rttmin; /* minimum rtt allowed */
155 u_int t_rttbest; /* best rtt we've seen */
156 u_long t_rttupdated; /* number of times rtt sampled */
157 u_long max_sndwnd; /* largest window peer has offered */
158
159 int t_softerror; /* possible error not yet reported */
160 /* out-of-band data */
161 char t_oobflags; /* have some */
162 char t_iobc; /* input character */
163 #define TCPOOB_HAVEDATA 0x01
164 #define TCPOOB_HADDATA 0x02
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_char requested_s_scale;
170 u_long ts_recent; /* timestamp echo data */
171
172 u_long ts_recent_age; /* when last updated */
173 tcp_seq last_ack_sent;
174 /* RFC 1644 variables */
175 tcp_cc cc_send; /* send connection count */
176 tcp_cc cc_recv; /* receive connection count */
177 /* experimental */
178 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
179 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
180 tcp_seq snd_high_prev; /* snd_high prior to retransmit */
181 u_long t_badrxtwin; /* window for retransmit recovery */
182 };
183
184 #ifdef TCP_SIGNATURE
185 /*
186 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
187 * for SADB verification and lookup.
188 */
189 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
190 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
191 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
192 /*
193 * Only a single SA per host may be specified at this time. An SPI is
194 * needed in order for the KEY_ALLOCSA() lookup to work.
195 */
196 #define TCP_SIG_SPI 0x1000
197 #endif /* TCP_SIGNATURE */
198
199 /*
200 * Structure to hold TCP options that are only used during segment
201 * processing (in tcp_input), but not held in the tcpcb.
202 * It's basically used to reduce the number of parameters
203 * to tcp_dooptions.
204 */
205 struct tcpopt {
206 u_long to_flags; /* which options are present */
207 #define TOF_TS 0x0001 /* timestamp */
208 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */
209 #define TOF_CCNEW 0x0004
210 #define TOF_CCECHO 0x0008
211 #define TOF_MSS 0x0010
212 #define TOF_SCALE 0x0020
213 #define TOF_SIGNATURE 0x0040 /* signature option present */
214 #define TOF_SIGLEN 0x0080 /* sigature length valid (RFC2385) */
215 u_int32_t to_tsval;
216 u_int32_t to_tsecr;
217 tcp_cc to_cc; /* holds CC or CCnew */
218 tcp_cc to_ccecho;
219 u_int16_t to_mss;
220 u_int8_t to_requested_s_scale;
221 u_int8_t to_pad;
222 };
223
224 struct syncache {
225 inp_gen_t sc_inp_gencnt; /* pointer check */
226 struct tcpcb *sc_tp; /* tcb for listening socket */
227 struct mbuf *sc_ipopts; /* source route */
228 struct in_conninfo sc_inc; /* addresses */
229 #define sc_route sc_inc.inc_route
230 #define sc_route6 sc_inc.inc6_route
231 u_int32_t sc_tsrecent;
232 u_int32_t sc_flowlabel; /* IPv6 flowlabel */
233 tcp_cc sc_cc_send; /* holds CC or CCnew */
234 tcp_cc sc_cc_recv;
235 tcp_seq sc_irs; /* seq from peer */
236 tcp_seq sc_iss; /* our ISS */
237 u_long sc_rxttime; /* retransmit time */
238 u_int16_t sc_rxtslot; /* retransmit counter */
239 u_int16_t sc_peer_mss; /* peer's MSS */
240 u_int16_t sc_wnd; /* advertised window */
241 u_int8_t sc_requested_s_scale:4,
242 sc_request_r_scale:4;
243 u_int8_t sc_flags;
244 #define SCF_NOOPT 0x01 /* no TCP options */
245 #define SCF_WINSCALE 0x02 /* negotiated window scaling */
246 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
247 #define SCF_CC 0x08 /* negotiated CC */
248 #define SCF_UNREACH 0x10 /* icmp unreachable received */
249 #define SCF_KEEPROUTE 0x20 /* keep cloned route */
250 #define SCF_SIGNATURE 0x40 /* send MD5 digests */
251 TAILQ_ENTRY(syncache) sc_hash;
252 TAILQ_ENTRY(syncache) sc_timerq;
253 };
254
255 struct syncache_head {
256 TAILQ_HEAD(, syncache) sch_bucket;
257 u_int sch_length;
258 };
259
260 /*
261 * The TAO cache entry which is stored in the protocol family specific
262 * portion of the route metrics.
263 */
264 struct rmxp_tao {
265 tcp_cc tao_cc; /* latest CC in valid SYN */
266 tcp_cc tao_ccsent; /* latest CC sent to peer */
267 u_short tao_mssopt; /* peer's cached MSS */
268 #ifdef notyet
269 u_short tao_flags; /* cache status flags */
270 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */
271 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */
272 #define TAOF_UNDEF 0 /* we don't know yet */
273 #endif /* notyet */
274 };
275 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler)
276
277 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
278 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
279
280 /*
281 * The smoothed round-trip time and estimated variance
282 * are stored as fixed point numbers scaled by the values below.
283 * For convenience, these scales are also used in smoothing the average
284 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
285 * With these scales, srtt has 3 bits to the right of the binary point,
286 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
287 * binary point, and is smoothed with an ALPHA of 0.75.
288 */
289 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
290 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
291 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
292 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
293 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
294
295 /*
296 * The initial retransmission should happen at rtt + 4 * rttvar.
297 * Because of the way we do the smoothing, srtt and rttvar
298 * will each average +1/2 tick of bias. When we compute
299 * the retransmit timer, we want 1/2 tick of rounding and
300 * 1 extra tick because of +-1/2 tick uncertainty in the
301 * firing of the timer. The bias will give us exactly the
302 * 1.5 tick we need. But, because the bias is
303 * statistical, we have to test that we don't drop below
304 * the minimum feasible timer (which is 2 ticks).
305 * This version of the macro adapted from a paper by Lawrence
306 * Brakmo and Larry Peterson which outlines a problem caused
307 * by insufficient precision in the original implementation,
308 * which results in inappropriately large RTO values for very
309 * fast networks.
310 */
311 #define TCP_REXMTVAL(tp) \
312 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
313 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
314
315 /*
316 * TCP statistics.
317 * Many of these should be kept per connection,
318 * but that's inconvenient at the moment.
319 */
320 struct tcpstat {
321 u_long tcps_connattempt; /* connections initiated */
322 u_long tcps_accepts; /* connections accepted */
323 u_long tcps_connects; /* connections established */
324 u_long tcps_drops; /* connections dropped */
325 u_long tcps_conndrops; /* embryonic connections dropped */
326 u_long tcps_closed; /* conn. closed (includes drops) */
327 u_long tcps_segstimed; /* segs where we tried to get rtt */
328 u_long tcps_rttupdated; /* times we succeeded */
329 u_long tcps_delack; /* delayed acks sent */
330 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
331 u_long tcps_rexmttimeo; /* retransmit timeouts */
332 u_long tcps_persisttimeo; /* persist timeouts */
333 u_long tcps_keeptimeo; /* keepalive timeouts */
334 u_long tcps_keepprobe; /* keepalive probes sent */
335 u_long tcps_keepdrops; /* connections dropped in keepalive */
336
337 u_long tcps_sndtotal; /* total packets sent */
338 u_long tcps_sndpack; /* data packets sent */
339 u_long tcps_sndbyte; /* data bytes sent */
340 u_long tcps_sndrexmitpack; /* data packets retransmitted */
341 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
342 u_long tcps_sndacks; /* ack-only packets sent */
343 u_long tcps_sndprobe; /* window probes sent */
344 u_long tcps_sndurg; /* packets sent with URG only */
345 u_long tcps_sndwinup; /* window update-only packets sent */
346 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
347
348 u_long tcps_rcvtotal; /* total packets received */
349 u_long tcps_rcvpack; /* packets received in sequence */
350 u_long tcps_rcvbyte; /* bytes received in sequence */
351 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
352 u_long tcps_rcvbadoff; /* packets received with bad offset */
353 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
354 u_long tcps_rcvshort; /* packets received too short */
355 u_long tcps_rcvduppack; /* duplicate-only packets received */
356 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
357 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
358 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
359 u_long tcps_rcvoopack; /* out-of-order packets received */
360 u_long tcps_rcvoobyte; /* out-of-order bytes received */
361 u_long tcps_rcvpackafterwin; /* packets with data after window */
362 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
363 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
364 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
365 u_long tcps_rcvdupack; /* rcvd duplicate acks */
366 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
367 u_long tcps_rcvackpack; /* rcvd ack packets */
368 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
369 u_long tcps_rcvwinupd; /* rcvd window update packets */
370 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
371 u_long tcps_predack; /* times hdr predict ok for acks */
372 u_long tcps_preddat; /* times hdr predict ok for data pkts */
373 u_long tcps_pcbcachemiss;
374 u_long tcps_cachedrtt; /* times cached RTT in route updated */
375 u_long tcps_cachedrttvar; /* times cached rttvar updated */
376 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
377 u_long tcps_usedrtt; /* times RTT initialized from route */
378 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
379 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
380 u_long tcps_persistdrop; /* timeout in persist state */
381 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
382 u_long tcps_mturesent; /* resends due to MTU discovery */
383 u_long tcps_listendrop; /* listen queue overflows */
384
385 u_long tcps_sc_added; /* entry added to syncache */
386 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
387 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
388 u_long tcps_sc_dropped; /* could not reply to packet */
389 u_long tcps_sc_completed; /* successful extraction of entry */
390 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
391 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
392 u_long tcps_sc_reset; /* RST removed entry from syncache */
393 u_long tcps_sc_stale; /* timed out or listen socket gone */
394 u_long tcps_sc_aborted; /* syncache entry aborted */
395 u_long tcps_sc_badack; /* removed due to bad ACK */
396 u_long tcps_sc_unreach; /* ICMP unreachable received */
397 u_long tcps_sc_zonefail; /* zalloc() failed */
398 u_long tcps_sc_sendcookie; /* SYN cookie sent */
399 u_long tcps_sc_recvcookie; /* SYN cookie received */
400 };
401
402 /*
403 * TCB structure exported to user-land via sysctl(3).
404 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
405 * included. Not all of our clients do.
406 */
407 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
408 struct xtcpcb {
409 size_t xt_len;
410 struct inpcb xt_inp;
411 struct tcpcb xt_tp;
412 struct xsocket xt_socket;
413 u_quad_t xt_alignment_hack;
414 };
415 #endif
416
417 /*
418 * Names for TCP sysctl objects
419 */
420 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
421 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */
422 #define TCPCTL_MSSDFLT 3 /* MSS default */
423 #define TCPCTL_STATS 4 /* statistics (read-only) */
424 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
425 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
426 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
427 #define TCPCTL_SENDSPACE 8 /* send buffer space */
428 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
429 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
430 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
431 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
432 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
433 #define TCPCTL_MAXID 14
434
435 #define TCPCTL_NAMES { \
436 { 0, 0 }, \
437 { "rfc1323", CTLTYPE_INT }, \
438 { "rfc1644", CTLTYPE_INT }, \
439 { "mssdflt", CTLTYPE_INT }, \
440 { "stats", CTLTYPE_STRUCT }, \
441 { "rttdflt", CTLTYPE_INT }, \
442 { "keepidle", CTLTYPE_INT }, \
443 { "keepintvl", CTLTYPE_INT }, \
444 { "sendspace", CTLTYPE_INT }, \
445 { "recvspace", CTLTYPE_INT }, \
446 { "keepinit", CTLTYPE_INT }, \
447 { "pcblist", CTLTYPE_STRUCT }, \
448 { "delacktime", CTLTYPE_INT }, \
449 { "v6mssdflt", CTLTYPE_INT }, \
450 }
451
452
453 #ifdef _KERNEL
454 #ifdef SYSCTL_DECL
455 SYSCTL_DECL(_net_inet_tcp);
456 #endif
457
458 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
459 extern struct inpcbinfo tcbinfo;
460 extern struct tcpstat tcpstat; /* tcp statistics */
461 extern int tcp_mssdflt; /* XXX */
462 extern int tcp_delack_enabled;
463 extern int tcp_do_newreno;
464 extern int path_mtu_discovery;
465 extern int ss_fltsz;
466 extern int ss_fltsz_local;
467
468 void tcp_canceltimers __P((struct tcpcb *));
469 struct tcpcb *
470 tcp_close __P((struct tcpcb *));
471 void tcp_ctlinput __P((int, struct sockaddr *, void *));
472 int tcp_ctloutput __P((struct socket *, struct sockopt *));
473 struct tcpcb *
474 tcp_drop __P((struct tcpcb *, int));
475 void tcp_drain __P((void));
476 void tcp_fasttimo __P((void));
477 struct rmxp_tao *
478 tcp_gettaocache __P((struct in_conninfo *));
479 void tcp_init __P((void));
480 void tcp_input __P((struct mbuf *, int, int));
481 void tcp_mss __P((struct tcpcb *, int));
482 int tcp_mssopt __P((struct tcpcb *));
483 void tcp_drop_syn_sent __P((struct inpcb *, int));
484 void tcp_mtudisc __P((struct inpcb *, int));
485 struct tcpcb *
486 tcp_newtcpcb __P((struct inpcb *));
487 int tcp_output __P((struct tcpcb *));
488 void tcp_quench __P((struct inpcb *, int));
489 void tcp_respond __P((struct tcpcb *, void *,
490 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int));
491 struct rtentry *
492 tcp_rtlookup __P((struct in_conninfo *));
493 void tcp_setpersist __P((struct tcpcb *));
494 #ifdef TCP_SIGNATURE
495 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
496 #endif
497 void tcp_slowtimo __P((void));
498 struct tcptemp *
499 tcp_maketemplate __P((struct tcpcb *));
500 void tcp_fillheaders __P((struct tcpcb *, void *, void *));
501 struct tcpcb *
502 tcp_timers __P((struct tcpcb *, int));
503 void tcp_trace __P((int, int, struct tcpcb *, void *, struct tcphdr *,
504 int));
505 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
506 void syncache_init(void);
507 void syncache_unreach(struct in_conninfo *, struct tcphdr *);
508 int syncache_expand(struct in_conninfo *, struct tcphdr *,
509 struct socket **, struct mbuf *);
510 int syncache_add(struct in_conninfo *, struct tcpopt *,
511 struct tcphdr *, struct socket **, struct mbuf *);
512 void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
513 void syncache_badack(struct in_conninfo *);
514
515 extern struct pr_usrreqs tcp_usrreqs;
516 extern u_long tcp_sendspace;
517 extern u_long tcp_recvspace;
518 tcp_seq tcp_new_isn __P((struct tcpcb *));
519
520 #endif /* _KERNEL */
521
522 #endif /* _NETINET_TCP_VAR_H_ */
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