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Root/tags/2.0/i386/include/netinet/tcp_var.h

Source at commit 1808 created 12 years 4 months ago.
By blackosx, Revise layout of package installer 'Welcome' file so it looks cleaner. Change the copyright notice to begin from 2009 as seen in the Chameleon 2.0 r431 installer. Should this date be set earlier?
1/*␊
2 * Copyright (c) 2000-2008 Apple Inc. All rights reserved.␊
3 *␊
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@␊
5 * ␊
6 * This file contains Original Code and/or Modifications of Original Code␊
7 * as defined in and that are subject to the Apple Public Source License␊
8 * Version 2.0 (the 'License'). You may not use this file except in␊
9 * compliance with the License. The rights granted to you under the License␊
10 * may not be used to create, or enable the creation or redistribution of,␊
11 * unlawful or unlicensed copies of an Apple operating system, or to␊
12 * circumvent, violate, or enable the circumvention or violation of, any␊
13 * terms of an Apple operating system software license agreement.␊
14 * ␊
15 * Please obtain a copy of the License at␊
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.␊
17 * ␊
18 * The Original Code and all software distributed under the License are␊
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊
23 * Please see the License for the specific language governing rights and␊
24 * limitations under the License.␊
25 * ␊
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@␊
27 */␊
28/*␊
29 * Copyright (c) 1982, 1986, 1993, 1994, 1995␊
30 *␉The Regents of the University of California. All rights reserved.␊
31 *␊
32 * Redistribution and use in source and binary forms, with or without␊
33 * modification, are permitted provided that the following conditions␊
34 * are met:␊
35 * 1. Redistributions of source code must retain the above copyright␊
36 * notice, this list of conditions and the following disclaimer.␊
37 * 2. Redistributions in binary form must reproduce the above copyright␊
38 * notice, this list of conditions and the following disclaimer in the␊
39 * documentation and/or other materials provided with the distribution.␊
40 * 3. All advertising materials mentioning features or use of this software␊
41 * must display the following acknowledgement:␊
42 *␉This product includes software developed by the University of␊
43 *␉California, Berkeley and its contributors.␊
44 * 4. Neither the name of the University nor the names of its contributors␊
45 * may be used to endorse or promote products derived from this software␊
46 * without specific prior written permission.␊
47 *␊
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊
58 * SUCH DAMAGE.␊
59 *␊
60 *␉@(#)tcp_var.h␉8.4 (Berkeley) 5/24/95␊
61 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.8 2001/08/22 00:59:13 silby Exp $␊
62 */␊
63␊
64#ifndef _NETINET_TCP_VAR_H_␊
65#define _NETINET_TCP_VAR_H_␊
66#include <sys/appleapiopts.h>␊
67#include <sys/queue.h>␊
68#include <netinet/in_pcb.h>␊
69#include <netinet/tcp_timer.h>␊
70␊
71#if defined(__LP64__)␊
72#define _TCPCB_PTR(x)␉␉␉u_int32_t␊
73#define _TCPCB_LIST_HEAD(name, type)␉\␊
74struct name {␉␉␉␉\␊
75␉u_int32_t␉lh_first;␉\␊
76};␊
77#else␊
78#define _TCPCB_PTR(x)␉␉␉x␊
79#define _TCPCB_LIST_HEAD(name, type)␉LIST_HEAD(name, type)␊
80#endif␊
81␊
82#define TCP_RETRANSHZ␉ 10␉␉/* tcp retrans timer (100ms) per hz */␉␉␊
83␊
84struct tseg_qent;␊
85_TCPCB_LIST_HEAD(tsegqe_head, tseg_qent);␊
86␊
87struct tcpcb {␊
88␉struct␉tsegqe_head t_segq;␊
89␉int␉t_dupacks;␉␉/* consecutive dup acks recd */␊
90␉u_int32_t unused;␉␉/* unused now: was t_template */␊
91␊
92␉int␉t_timer[TCPT_NTIMERS];␉/* tcp timers */␊
93␊
94␉_TCPCB_PTR(struct inpcb *) t_inpcb;␉/* back pointer to internet pcb */␊
95␉int␉t_state;␉␉/* state of this connection */␊
96␉u_int␉t_flags;␊
97#define␉TF_ACKNOW␉0x00001␉␉/* ack peer immediately */␊
98#define␉TF_DELACK␉0x00002␉␉/* ack, but try to delay it */␊
99#define␉TF_NODELAY␉0x00004␉␉/* don't delay packets to coalesce */␊
100#define␉TF_NOOPT␉0x00008␉␉/* don't use tcp options */␊
101#define␉TF_SENTFIN␉0x00010␉␉/* have sent FIN */␊
102#define␉TF_REQ_SCALE␉0x00020␉␉/* have/will request window scaling */␊
103#define␉TF_RCVD_SCALE␉0x00040␉␉/* other side has requested scaling */␊
104#define␉TF_REQ_TSTMP␉0x00080␉␉/* have/will request timestamps */␊
105#define␉TF_RCVD_TSTMP␉0x00100␉␉/* a timestamp was received in SYN */␊
106#define␉TF_SACK_PERMIT␉0x00200␉␉/* other side said I could SACK */␊
107#define␉TF_NEEDSYN␉0x00400␉␉/* send SYN (implicit state) */␊
108#define␉TF_NEEDFIN␉0x00800␉␉/* send FIN (implicit state) */␊
109#define␉TF_NOPUSH␉0x01000␉␉/* don't push */␊
110#define␉TF_REQ_CC␉0x02000␉␉/* have/will request CC */␊
111#define␉TF_RCVD_CC␉0x04000␉␉/* a CC was received in SYN */␊
112#define␉TF_SENDCCNEW␉0x08000␉␉/* send CCnew instead of CC in SYN */␊
113#define␉TF_MORETOCOME␉0x10000␉␉/* More data to be appended to sock */␊
114#define␉TF_LQ_OVERFLOW␉0x20000␉␉/* listen queue overflow */␊
115#define␉TF_RXWIN0SENT␉0x40000␉␉/* sent a receiver win 0 in response */␊
116#define␉TF_SLOWLINK␉0x80000␉␉/* route is a on a modem speed link */␊
117␊
118␉int␉t_force;␉␉/* 1 if forcing out a byte */␊
119␊
120␉tcp_seq␉snd_una;␉␉/* send unacknowledged */␊
121␉tcp_seq␉snd_max;␉␉/* highest sequence number sent;␊
122␉␉␉␉␉ * used to recognize retransmits␊
123␉␉␉␉␉ */␊
124␉tcp_seq␉snd_nxt;␉␉/* send next */␊
125␉tcp_seq␉snd_up;␉␉␉/* send urgent pointer */␊
126␊
127␉tcp_seq␉snd_wl1;␉␉/* window update seg seq number */␊
128␉tcp_seq␉snd_wl2;␉␉/* window update seg ack number */␊
129␉tcp_seq␉iss;␉␉␉/* initial send sequence number */␊
130␉tcp_seq␉irs;␉␉␉/* initial receive sequence number */␊
131␊
132␉tcp_seq␉rcv_nxt;␉␉/* receive next */␊
133␉tcp_seq␉rcv_adv;␉␉/* advertised window */␊
134␉u_int32_t rcv_wnd;␉␉/* receive window */␊
135␉tcp_seq␉rcv_up;␉␉␉/* receive urgent pointer */␊
136␊
137␉u_int32_t snd_wnd;␉␉/* send window */␊
138␉u_int32_t snd_cwnd;␉␉/* congestion-controlled window */␊
139␉u_int32_t snd_ssthresh;␉␉/* snd_cwnd size threshold for␊
140␉␉␉␉␉ * for slow start exponential to␊
141␉␉␉␉␉ * linear switch␊
142␉␉␉␉␉ */␊
143␉u_int␉t_maxopd;␉␉/* mss plus options */␊
144␊
145␉u_int32_t t_rcvtime;␉␉/* inactivity time */␊
146␉u_int32_t t_starttime;␉␉/* time connection was established */␊
147␉int␉t_rtttime;␉␉/* round trip time */␊
148␉tcp_seq␉t_rtseq;␉␉/* sequence number being timed */␊
149␊
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 */␊
154␊
155␉int␉t_rxtshift;␉␉/* log(2) of rexmt exp. backoff */␊
156␉u_int␉t_rttmin;␉␉/* minimum rtt allowed */␊
157␉u_int32_t t_rttupdated;␉␉/* number of times rtt sampled */␊
158␉u_int32_t max_sndwnd;␉␉/* largest window peer has offered */␊
159␊
160␉int␉t_softerror;␉␉/* possible error not yet reported */␊
161/* out-of-band data */␊
162␉char␉t_oobflags;␉␉/* have some */␊
163␉char␉t_iobc;␉␉␉/* input character */␊
164#define␉TCPOOB_HAVEDATA␉0x01␊
165#define␉TCPOOB_HADDATA␉0x02␊
166/* RFC 1323 variables */␊
167␉u_char␉snd_scale;␉␉/* window scaling for send window */␊
168␉u_char␉rcv_scale;␉␉/* window scaling for recv window */␊
169␉u_char␉request_r_scale;␉/* pending window scaling */␊
170␉u_char␉requested_s_scale;␊
171␉u_int32_t ts_recent;␉␉/* timestamp echo data */␊
172␊
173␉u_int32_t ts_recent_age;␉/* when last updated */␊
174␉tcp_seq␉last_ack_sent;␊
175/* RFC 1644 variables */␊
176␉tcp_cc␉cc_send;␉␉/* send connection count */␊
177␉tcp_cc␉cc_recv;␉␉/* receive connection count */␊
178␉tcp_seq␉snd_recover;␉␉/* for use in fast recovery */␊
179/* experimental */␊
180␉u_int32_t snd_cwnd_prev;␉/* cwnd prior to retransmit */␊
181␉u_int32_t snd_ssthresh_prev;␉/* ssthresh prior to retransmit */␊
182␉u_int32_t t_badrxtwin;␉␉/* window for retransmit recovery */␊
183};␊
184␊
185␊
186/*␊
187 * TCP statistics.␊
188 * Many of these should be kept per connection,␊
189 * but that's inconvenient at the moment.␊
190 */␊
191struct␉tcpstat {␊
192␉u_int32_t␉tcps_connattempt;␉/* connections initiated */␊
193␉u_int32_t␉tcps_accepts;␉␉/* connections accepted */␊
194␉u_int32_t␉tcps_connects;␉␉/* connections established */␊
195␉u_int32_t␉tcps_drops;␉␉/* connections dropped */␊
196␉u_int32_t␉tcps_conndrops;␉␉/* embryonic connections dropped */␊
197␉u_int32_t␉tcps_closed;␉␉/* conn. closed (includes drops) */␊
198␉u_int32_t␉tcps_segstimed;␉␉/* segs where we tried to get rtt */␊
199␉u_int32_t␉tcps_rttupdated;␉/* times we succeeded */␊
200␉u_int32_t␉tcps_delack;␉␉/* delayed acks sent */␊
201␉u_int32_t␉tcps_timeoutdrop;␉/* conn. dropped in rxmt timeout */␊
202␉u_int32_t␉tcps_rexmttimeo;␉/* retransmit timeouts */␊
203␉u_int32_t␉tcps_persisttimeo;␉/* persist timeouts */␊
204␉u_int32_t␉tcps_keeptimeo;␉␉/* keepalive timeouts */␊
205␉u_int32_t␉tcps_keepprobe;␉␉/* keepalive probes sent */␊
206␉u_int32_t␉tcps_keepdrops;␉␉/* connections dropped in keepalive */␊
207␊
208␉u_int32_t␉tcps_sndtotal;␉␉/* total packets sent */␊
209␉u_int32_t␉tcps_sndpack;␉␉/* data packets sent */␊
210␉u_int32_t␉tcps_sndbyte;␉␉/* data bytes sent */␊
211␉u_int32_t␉tcps_sndrexmitpack;␉/* data packets retransmitted */␊
212␉u_int32_t␉tcps_sndrexmitbyte;␉/* data bytes retransmitted */␊
213␉u_int32_t␉tcps_sndacks;␉␉/* ack-only packets sent */␊
214␉u_int32_t␉tcps_sndprobe;␉␉/* window probes sent */␊
215␉u_int32_t␉tcps_sndurg;␉␉/* packets sent with URG only */␊
216␉u_int32_t␉tcps_sndwinup;␉␉/* window update-only packets sent */␊
217␉u_int32_t␉tcps_sndctrl;␉␉/* control (SYN|FIN|RST) packets sent */␊
218␊
219␉u_int32_t␉tcps_rcvtotal;␉␉/* total packets received */␊
220␉u_int32_t␉tcps_rcvpack;␉␉/* packets received in sequence */␊
221␉u_int32_t␉tcps_rcvbyte;␉␉/* bytes received in sequence */␊
222␉u_int32_t␉tcps_rcvbadsum;␉␉/* packets received with ccksum errs */␊
223␉u_int32_t␉tcps_rcvbadoff;␉␉/* packets received with bad offset */␊
224␉u_int32_t␉tcps_rcvmemdrop;␉/* packets dropped for lack of memory */␊
225␉u_int32_t␉tcps_rcvshort;␉␉/* packets received too short */␊
226␉u_int32_t␉tcps_rcvduppack;␉/* duplicate-only packets received */␊
227␉u_int32_t␉tcps_rcvdupbyte;␉/* duplicate-only bytes received */␊
228␉u_int32_t␉tcps_rcvpartduppack;␉/* packets with some duplicate data */␊
229␉u_int32_t␉tcps_rcvpartdupbyte;␉/* dup. bytes in part-dup. packets */␊
230␉u_int32_t␉tcps_rcvoopack;␉␉/* out-of-order packets received */␊
231␉u_int32_t␉tcps_rcvoobyte;␉␉/* out-of-order bytes received */␊
232␉u_int32_t␉tcps_rcvpackafterwin;␉/* packets with data after window */␊
233␉u_int32_t␉tcps_rcvbyteafterwin;␉/* bytes rcvd after window */␊
234␉u_int32_t␉tcps_rcvafterclose;␉/* packets rcvd after "close" */␊
235␉u_int32_t␉tcps_rcvwinprobe;␉/* rcvd window probe packets */␊
236␉u_int32_t␉tcps_rcvdupack;␉␉/* rcvd duplicate acks */␊
237␉u_int32_t␉tcps_rcvacktoomuch;␉/* rcvd acks for unsent data */␊
238␉u_int32_t␉tcps_rcvackpack;␉/* rcvd ack packets */␊
239␉u_int32_t␉tcps_rcvackbyte;␉/* bytes acked by rcvd acks */␊
240␉u_int32_t␉tcps_rcvwinupd;␉␉/* rcvd window update packets */␊
241␉u_int32_t␉tcps_pawsdrop;␉␉/* segments dropped due to PAWS */␊
242␉u_int32_t␉tcps_predack;␉␉/* times hdr predict ok for acks */␊
243␉u_int32_t␉tcps_preddat;␉␉/* times hdr predict ok for data pkts */␊
244␉u_int32_t␉tcps_pcbcachemiss;␊
245␉u_int32_t␉tcps_cachedrtt;␉␉/* times cached RTT in route updated */␊
246␉u_int32_t␉tcps_cachedrttvar;␉/* times cached rttvar updated */␊
247␉u_int32_t␉tcps_cachedssthresh;␉/* times cached ssthresh updated */␊
248␉u_int32_t␉tcps_usedrtt;␉␉/* times RTT initialized from route */␊
249␉u_int32_t␉tcps_usedrttvar;␉/* times RTTVAR initialized from rt */␊
250␉u_int32_t␉tcps_usedssthresh;␉/* times ssthresh initialized from rt*/␊
251␉u_int32_t␉tcps_persistdrop;␉/* timeout in persist state */␊
252␉u_int32_t␉tcps_badsyn;␉␉/* bogus SYN, e.g. premature ACK */␊
253␉u_int32_t␉tcps_mturesent;␉␉/* resends due to MTU discovery */␊
254␉u_int32_t␉tcps_listendrop;␉/* listen queue overflows */␊
255␊
256␉/* new stats from FreeBSD 5.4 sync up */␊
257␉u_int32_t␉tcps_minmssdrops;␉/* average minmss too low drops */␊
258␉u_int32_t␉tcps_sndrexmitbad;␉/* unnecessary packet retransmissions */␊
259␉u_int32_t␉tcps_badrst;␉␉/* ignored RSTs in the window */␊
260␊
261␉u_int32_t␉tcps_sc_added;␉␉/* entry added to syncache */␊
262␉u_int32_t␉tcps_sc_retransmitted;␉/* syncache entry was retransmitted */␊
263␉u_int32_t␉tcps_sc_dupsyn;␉␉/* duplicate SYN packet */␊
264␉u_int32_t␉tcps_sc_dropped;␉/* could not reply to packet */␊
265␉u_int32_t␉tcps_sc_completed;␉/* successful extraction of entry */␊
266␉u_int32_t␉tcps_sc_bucketoverflow;␉/* syncache per-bucket limit hit */␊
267␉u_int32_t␉tcps_sc_cacheoverflow;␉/* syncache cache limit hit */␊
268␉u_int32_t␉tcps_sc_reset;␉␉/* RST removed entry from syncache */␊
269␉u_int32_t␉tcps_sc_stale;␉␉/* timed out or listen socket gone */␊
270␉u_int32_t␉tcps_sc_aborted;␉/* syncache entry aborted */␊
271␉u_int32_t␉tcps_sc_badack;␉␉/* removed due to bad ACK */␊
272␉u_int32_t␉tcps_sc_unreach;␉/* ICMP unreachable received */␊
273␉u_int32_t␉tcps_sc_zonefail;␉/* zalloc() failed */␊
274␉u_int32_t␉tcps_sc_sendcookie;␉/* SYN cookie sent */␊
275␉u_int32_t␉tcps_sc_recvcookie;␉/* SYN cookie received */␊
276␊
277␉u_int32_t␉tcps_hc_added;␉␉/* entry added to hostcache */␊
278␉u_int32_t␉tcps_hc_bucketoverflow;␉/* hostcache per bucket limit hit */␊
279␊
280␉/* SACK related stats */␊
281␉u_int32_t␉tcps_sack_recovery_episode; /* SACK recovery episodes */␊
282␉u_int32_t tcps_sack_rexmits;␉ /* SACK rexmit segments */␊
283␉u_int32_t tcps_sack_rexmit_bytes;␉ /* SACK rexmit bytes */␊
284␉u_int32_t tcps_sack_rcv_blocks;␉ /* SACK blocks (options) received */␊
285␉u_int32_t tcps_sack_send_blocks;␉ /* SACK blocks (options) sent */␊
286␉u_int32_t tcps_sack_sboverflow;␉ /* SACK sendblock overflow */␊
287␊
288#if TRAFFIC_MGT␊
289␉u_int32_t␉tcps_bg_rcvtotal;␉/* total background packets received */␊
290#endif /* TRAFFIC_MGT */␊
291};␊
292␊
293#pragma pack(4)␊
294␊
295/*␊
296 * TCB structure exported to user-land via sysctl(3).␊
297 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been␊
298 * included. Not all of our clients do.␊
299 */␊
300␊
301struct xtcpcb {␊
302 u_int32_t xt_len;␊
303 struct inpcb xt_inp;␊
304 struct tcpcb xt_tp;␊
305 struct xsocket xt_socket;␊
306 u_quad_t xt_alignment_hack;␊
307};␊
308␊
309#if !CONFIG_EMBEDDED␊
310␊
311struct xtcpcb64 {␊
312 u_int32_t ␉␉xt_len;␊
313 struct xinpcb64␉␉xt_inpcb;␊
314␊
315 u_int64_t t_segq;␊
316 int t_dupacks; /* consecutive dup acks recd */␊
317␊
318 int t_timer[TCPT_NTIMERS]; /* tcp timers */␊
319␊
320 int t_state; /* state of this connection */␊
321 u_int t_flags;␊
322␊
323 int t_force; /* 1 if forcing out a byte */␊
324␊
325 tcp_seq snd_una; /* send unacknowledged */␊
326 tcp_seq snd_max; /* highest sequence number sent;␊
327 * used to recognize retransmits␊
328 */␊
329 tcp_seq snd_nxt; /* send next */␊
330 tcp_seq snd_up; /* send urgent pointer */␊
331␊
332 tcp_seq snd_wl1; /* window update seg seq number */␊
333 tcp_seq snd_wl2; /* window update seg ack number */␊
334 tcp_seq iss; /* initial send sequence number */␊
335 tcp_seq irs; /* initial receive sequence number */␊
336␊
337 tcp_seq rcv_nxt; /* receive next */␊
338 tcp_seq rcv_adv; /* advertised window */␊
339 u_int32_t rcv_wnd; /* receive window */␊
340 tcp_seq rcv_up; /* receive urgent pointer */␊
341␊
342 u_int32_t snd_wnd; /* send window */␊
343 u_int32_t snd_cwnd; /* congestion-controlled window */␊
344 u_int32_t snd_ssthresh; /* snd_cwnd size threshold for␊
345 * for slow start exponential to␊
346 * linear switch␊
347 */␊
348 u_int t_maxopd; /* mss plus options */␊
349␊
350 u_int32_t t_rcvtime; /* inactivity time */␊
351 u_int32_t t_starttime; /* time connection was established */␊
352 int t_rtttime; /* round trip time */␊
353 tcp_seq t_rtseq; /* sequence number being timed */␊
354␊
355 int t_rxtcur; /* current retransmit value (ticks) */␊
356 u_int t_maxseg; /* maximum segment size */␊
357 int t_srtt; /* smoothed round-trip time */␊
358 int t_rttvar; /* variance in round-trip time */␊
359␊
360 int t_rxtshift; /* log(2) of rexmt exp. backoff */␊
361 u_int t_rttmin; /* minimum rtt allowed */␊
362 u_int32_t t_rttupdated; /* number of times rtt sampled */␊
363 u_int32_t max_sndwnd; /* largest window peer has offered */␊
364␊
365 int t_softerror; /* possible error not yet reported */␊
366/* out-of-band data */␊
367 char t_oobflags; /* have some */␊
368 char t_iobc; /* input character */␊
369/* RFC 1323 variables */␊
370 u_char snd_scale; /* window scaling for send window */␊
371 u_char rcv_scale; /* window scaling for recv window */␊
372 u_char request_r_scale; /* pending window scaling */␊
373 u_char requested_s_scale;␊
374 u_int32_t ts_recent; /* timestamp echo data */␊
375␊
376 u_int32_t ts_recent_age; /* when last updated */␊
377 tcp_seq last_ack_sent;␊
378/* RFC 1644 variables */␊
379 tcp_cc cc_send; /* send connection count */␊
380 tcp_cc cc_recv; /* receive connection count */␊
381 tcp_seq snd_recover; /* for use in fast recovery */␊
382/* experimental */␊
383 u_int32_t snd_cwnd_prev; /* cwnd prior to retransmit */␊
384 u_int32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */␊
385 u_int32_t t_badrxtwin; /* window for retransmit recovery */␊
386␊
387 u_quad_t␉␉xt_alignment_hack;␊
388};␊
389␊
390#endif /* !CONFIG_EMBEDDED */␊
391␊
392#pragma pack()␊
393␊
394/*␊
395 * Names for TCP sysctl objects␊
396 */␊
397#define␉TCPCTL_DO_RFC1323␉1␉/* use RFC-1323 extensions */␊
398#define␉TCPCTL_DO_RFC1644␉2␉/* use RFC-1644 extensions */␊
399#define␉TCPCTL_MSSDFLT␉␉3␉/* MSS default */␊
400#define TCPCTL_STATS␉␉4␉/* statistics (read-only) */␊
401#define␉TCPCTL_RTTDFLT␉␉5␉/* default RTT estimate */␊
402#define␉TCPCTL_KEEPIDLE␉␉6␉/* keepalive idle timer */␊
403#define␉TCPCTL_KEEPINTVL␉7␉/* interval to send keepalives */␊
404#define␉TCPCTL_SENDSPACE␉8␉/* send buffer space */␊
405#define␉TCPCTL_RECVSPACE␉9␉/* receive buffer space */␊
406#define␉TCPCTL_KEEPINIT␉␉10␉/* timeout for establishing syn */␊
407#define␉TCPCTL_PCBLIST␉␉11␉/* list of all outstanding PCBs */␊
408#define␉TCPCTL_DELACKTIME␉12␉/* time before sending delayed ACK */␊
409#define␉TCPCTL_V6MSSDFLT␉13␉/* MSS default for IPv6 */␊
410#define␉TCPCTL_MAXID␉␉14␊
411␊
412␊
413#endif /* _NETINET_TCP_VAR_H_ */␊
414

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