network - Move socket from netmsg ext to netmsg header, add port to socket
[dragonfly.git] / sys / netinet / tcp_var.h
CommitLineData
984263bc 1/*
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2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
f23061d4 4 *
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5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
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8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
f23061d4 19 *
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
66d6c637 34/*
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35 * Copyright (c) 1982, 1986, 1993, 1994, 1995
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
67 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.13 2003/02/03 02:34:07 hsu Exp $
e3873585 68 * $DragonFly: src/sys/netinet/tcp_var.h,v 1.42 2008/10/27 02:56:30 sephe Exp $
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69 */
70
71#ifndef _NETINET_TCP_VAR_H_
72#define _NETINET_TCP_VAR_H_
73
1bd40720 74#ifndef _NETINET_IN_PCB_H_
984263bc 75#include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */
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76#endif
77#ifndef _NETINET_TCP_H_
78#include <netinet/tcp.h>
79#endif
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80
81/*
82 * Kernel variables for tcp.
83 */
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84extern int tcp_do_rfc1323;
85extern int tcp_do_rfc1644;
86extern int tcp_do_rfc3390;
87extern int tcp_do_sack;
88extern int tcp_do_smartsack;
89extern int tcp_aggregate_acks;
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90
91/* TCP segment queue entry */
92struct tseg_qent {
93 LIST_ENTRY(tseg_qent) tqe_q;
94 int tqe_len; /* TCP segment data length */
95 struct tcphdr *tqe_th; /* a pointer to tcp header */
96 struct mbuf *tqe_m; /* mbuf contains packet */
97};
98LIST_HEAD(tsegqe_head, tseg_qent);
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99extern int tcp_reass_maxseg;
100extern int tcp_reass_qsize;
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101#ifdef MALLOC_DECLARE
102MALLOC_DECLARE(M_TSEGQ);
103#endif
104
105struct tcptemp {
106 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
107 struct tcphdr tt_t;
108};
109
110#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
111
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112struct raw_sackblock { /* covers [start, end) */
113 tcp_seq rblk_start;
114 tcp_seq rblk_end;
115};
116
117/* maximum number of SACK blocks that will fit in the TCP option space */
118#define MAX_SACK_REPORT_BLOCKS 4
119
120TAILQ_HEAD(sackblock_list, sackblock);
121
122struct scoreboard {
123 int nblocks;
124 struct sackblock_list sackblocks;
125 tcp_seq lostseq; /* passed SACK lost test */
126 struct sackblock *lastfound; /* search hint */
127};
128
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129struct netmsg_tcp_timer;
130
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131/*
132 * Tcp control block, one per tcp; fields:
133 * Organized for 16 byte cacheline efficiency.
134 */
135struct tcpcb {
136 struct tsegqe_head t_segq;
137 int t_dupacks; /* consecutive dup acks recd */
2b1ce38a 138 int tt_cpu; /* sanity check the cpu */
c1d3b892 139
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140 struct tcp_callout *tt_rexmt; /* retransmit timer */
141 struct tcp_callout *tt_persist;/* retransmit persistence */
142 struct tcp_callout *tt_keep; /* keepalive */
143 struct tcp_callout *tt_2msl; /* 2*msl TIME_WAIT timer */
144 struct tcp_callout *tt_delack; /* delayed ACK timer */
0f758523 145 struct netmsg_tcp_timer *tt_msg; /* timer message */
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146
147 struct inpcb *t_inpcb; /* back pointer to internet pcb */
148 int t_state; /* state of this connection */
149 u_int t_flags;
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150#define TF_ACKNOW 0x00000001 /* ack peer immediately */
151#define TF_DELACK 0x00000002 /* ack, but try to delay it */
152#define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
153#define TF_NOOPT 0x00000008 /* don't use tcp options */
154#define TF_SENTFIN 0x00000010 /* have sent FIN */
155#define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
156#define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
157#define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
158#define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
91489f6b 159#define TF_SACK_PERMITTED 0x00000200 /* other side said I could SACK */
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160#define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
161#define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
162#define TF_NOPUSH 0x00001000 /* don't push */
163#define TF_REQ_CC 0x00002000 /* have/will request CC */
164#define TF_RCVD_CC 0x00004000 /* a CC was received in SYN */
165#define TF_SENDCCNEW 0x00008000 /* send CCnew instead of CC in SYN */
166#define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
167#define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */
168#define TF_LASTIDLE 0x00040000 /* connection was previously idle */
169#define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
170#define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */
171#define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */
172#define TF_FIRSTACCACK 0x00400000 /* Look for 1st acceptable ACK. */
173#define TF_FASTREXMT 0x00800000 /* Did Fast Retransmit. */
174#define TF_EARLYREXMT 0x01000000 /* Did Early (Fast) Retransmit. */
c1d3b892 175#define TF_FORCE 0x02000000 /* Set if forcing out a byte */
2b1ce38a 176#define TF_ONOUTPUTQ 0x04000000 /* on t_outputq list */
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177#define TF_DUPSEG 0x08000000 /* last seg a duplicate */
178#define TF_ENCLOSESEG 0x10000000 /* enclosing SACK block */
179#define TF_SACKLEFT 0x20000000 /* send SACK blocks from left side */
efca2b8e 180#define TF_KEEPALIVE 0x40000000 /* temporary keepalive */
46e92930 181#define TF_RXRESIZED 0x80000000 /* rcvbuf was resized */
c1d3b892 182 tcp_seq snd_up; /* send urgent pointer */
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183
184 tcp_seq snd_una; /* send unacknowledged */
c1d3b892 185 tcp_seq snd_recover; /* for use with NewReno Fast Recovery */
984263bc 186 tcp_seq snd_max; /* highest sequence number sent;
8acdb67c 187 * used to recognize retransmits */
984263bc 188 tcp_seq snd_nxt; /* send next */
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189
190 tcp_seq snd_wl1; /* window update seg seq number */
191 tcp_seq snd_wl2; /* window update seg ack number */
192 tcp_seq iss; /* initial send sequence number */
193 tcp_seq irs; /* initial receive sequence number */
194
195 tcp_seq rcv_nxt; /* receive next */
196 tcp_seq rcv_adv; /* advertised window */
197 u_long rcv_wnd; /* receive window */
198 tcp_seq rcv_up; /* receive urgent pointer */
199
200 u_long snd_wnd; /* send window */
201 u_long snd_cwnd; /* congestion-controlled window */
8acdb67c 202 u_long snd_wacked; /* bytes acked in one send window */
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203 u_long snd_ssthresh; /* snd_cwnd size threshold for
204 * for slow start exponential to
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205 * linear switch */
206
207 int t_rxtcur; /* current retransmit value (ticks) */
208 u_int t_maxseg; /* maximum segment size */
209 int t_srtt; /* smoothed round-trip time */
210 int t_rttvar; /* variance in round-trip time */
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211
212 u_int t_maxopd; /* mss plus options */
213
214 u_long t_rcvtime; /* inactivity time */
215 u_long t_starttime; /* time connection was established */
216 int t_rtttime; /* round trip time */
217 tcp_seq t_rtseq; /* sequence number being timed */
218
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219 int t_rxtshift; /* log(2) of rexmt exp. backoff */
220 u_int t_rttmin; /* minimum rtt allowed */
221 u_int t_rttbest; /* best rtt we've seen */
222 u_long t_rttupdated; /* number of times rtt sampled */
223 u_long max_sndwnd; /* largest window peer has offered */
224
225 int t_softerror; /* possible error not yet reported */
226/* out-of-band data */
227 char t_oobflags; /* have some */
228 char t_iobc; /* input character */
229#define TCPOOB_HAVEDATA 0x01
230#define TCPOOB_HADDATA 0x02
8acdb67c 231
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232/* RFC 1323 variables */
233 u_char snd_scale; /* window scaling for send window */
234 u_char rcv_scale; /* window scaling for recv window */
235 u_char request_r_scale; /* pending window scaling */
236 u_char requested_s_scale;
237 u_long ts_recent; /* timestamp echo data */
238
239 u_long ts_recent_age; /* when last updated */
240 tcp_seq last_ack_sent;
8acdb67c 241
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242/* RFC 1644 variables */
243 tcp_cc cc_send; /* send connection count */
244 tcp_cc cc_recv; /* receive connection count */
8acdb67c 245
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246/* experimental */
247 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
8acdb67c 248 u_long snd_wacked_prev; /* prior bytes acked in send window */
984263bc 249 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
9845754e 250 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
984263bc 251 u_long t_badrxtwin; /* window for retransmit recovery */
efd4b327 252 u_long t_rexmtTS; /* timestamp of last retransmit */
33abdd1c 253 u_char snd_limited; /* segments limited transmitted */
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254
255 tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */
256 tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */
257 struct scoreboard scb; /* sack scoreboard */
258 struct raw_sackblock reportblk; /* incoming segment or D-SACK block */
259 struct raw_sackblock encloseblk;
260 int nsackhistory;
261 struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */
2b1ce38a 262 TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */
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263
264 /* bandwith limitation */
265 u_long snd_bandwidth; /* calculated bandwidth or 0 */
266 u_long snd_bwnd; /* bandwidth-controlled window */
267 int t_bw_rtttime; /* used for bandwidth calculation */
268 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
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269
270/* anti DoS counters */
271 u_long rcv_second; /* start of interval second */
272 u_long rcv_pps; /* received packets per second */
273 u_long rcv_byps; /* received bytes per second */
274
275 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
276 int rfbuf_cnt; /* recv buffer autoscaling byte count */
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277};
278
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279#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
280#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
281#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
282
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283/*
284 * TCP statistics.
285 */
286struct tcp_stats {
287 u_long tcps_connattempt; /* connections initiated */
288 u_long tcps_accepts; /* connections accepted */
289 u_long tcps_connects; /* connections established */
290 u_long tcps_drops; /* connections dropped */
291 u_long tcps_conndrops; /* embryonic connections dropped */
5b0b9fa5 292 u_long tcps_minmssdrops; /* average minmss too low drops */
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293 u_long tcps_closed; /* conn. closed (includes drops) */
294 u_long tcps_segstimed; /* segs where we tried to get rtt */
295 u_long tcps_rttupdated; /* times we succeeded */
296 u_long tcps_delack; /* delayed acks sent */
297 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
298 u_long tcps_rexmttimeo; /* retransmit timeouts */
299 u_long tcps_persisttimeo; /* persist timeouts */
300 u_long tcps_keeptimeo; /* keepalive timeouts */
301 u_long tcps_keepprobe; /* keepalive probes sent */
302 u_long tcps_keepdrops; /* connections dropped in keepalive */
303
304 u_long tcps_sndtotal; /* total packets sent */
305 u_long tcps_sndpack; /* data packets sent */
306 u_long tcps_sndbyte; /* data bytes sent */
307 u_long tcps_sndrexmitpack; /* data packets retransmitted */
308 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
309 u_long tcps_sndfastrexmit; /* Fast Retransmissions */
310 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */
311 u_long tcps_sndlimited; /* Limited Transmit packets */
312 u_long tcps_sndrtobad; /* spurious RTO retransmissions */
313 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */
314 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions,
315 a subset of tcps_sndfastrexmitbad */
316 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */
317 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */
318 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */
319 u_long tcps_sndacks; /* ack-only packets sent */
320 u_long tcps_sndprobe; /* window probes sent */
321 u_long tcps_sndurg; /* packets sent with URG only */
322 u_long tcps_sndwinup; /* window update-only packets sent */
323 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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324 u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */
325 u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */
326 u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */
327 u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */
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328
329 u_long tcps_rcvtotal; /* total packets received */
330 u_long tcps_rcvpack; /* packets received in sequence */
331 u_long tcps_rcvbyte; /* bytes received in sequence */
332 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
333 u_long tcps_rcvbadoff; /* packets received with bad offset */
334 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
335 u_long tcps_rcvshort; /* packets received too short */
336 u_long tcps_rcvduppack; /* duplicate-only packets received */
337 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
338 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
339 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
340 u_long tcps_rcvoopack; /* out-of-order packets received */
341 u_long tcps_rcvoobyte; /* out-of-order bytes received */
342 u_long tcps_rcvpackafterwin; /* packets with data after window */
343 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
344 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
345 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
346 u_long tcps_rcvdupack; /* rcvd duplicate acks */
347 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
348 u_long tcps_rcvackpack; /* rcvd ack packets */
349 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
350 u_long tcps_rcvwinupd; /* rcvd window update packets */
351 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
352 u_long tcps_predack; /* times hdr predict ok for acks */
353 u_long tcps_preddat; /* times hdr predict ok for data pkts */
354 u_long tcps_pcbcachemiss;
355 u_long tcps_cachedrtt; /* times cached RTT in route updated */
356 u_long tcps_cachedrttvar; /* times cached rttvar updated */
357 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
358 u_long tcps_usedrtt; /* times RTT initialized from route */
359 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
360 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
361 u_long tcps_persistdrop; /* timeout in persist state */
362 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
363 u_long tcps_mturesent; /* resends due to MTU discovery */
364 u_long tcps_listendrop; /* listen queue overflows */
365
366 u_long tcps_sc_added; /* entry added to syncache */
367 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
368 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
369 u_long tcps_sc_dropped; /* could not reply to packet */
370 u_long tcps_sc_completed; /* successful extraction of entry */
371 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
372 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
373 u_long tcps_sc_reset; /* RST removed entry from syncache */
374 u_long tcps_sc_stale; /* timed out or listen socket gone */
375 u_long tcps_sc_aborted; /* syncache entry aborted */
376 u_long tcps_sc_badack; /* removed due to bad ACK */
377 u_long tcps_sc_unreach; /* ICMP unreachable received */
378 u_long tcps_sc_zonefail; /* zalloc() failed */
379 u_long tcps_sc_sendcookie; /* SYN cookie sent */
380 u_long tcps_sc_recvcookie; /* SYN cookie received */
381};
382
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383#ifdef _KERNEL
384
385#if defined(SMP)
386#define tcpstat tcpstats_percpu[mycpuid]
387#else
388#define tcpstat tcpstats_percpu[0]
389#endif
390
391struct sockopt;
392
393extern struct tcp_stats tcpstats_percpu[MAXCPU];
394
395static const int tcprexmtthresh = 3;
396#endif
397
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398/*
399 * Structure to hold TCP options that are only used during segment
400 * processing (in tcp_input), but not held in the tcpcb.
401 * It's basically used to reduce the number of parameters
402 * to tcp_dooptions.
403 */
404struct tcpopt {
405 u_long to_flags; /* which options are present */
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406#define TOF_TS 0x0001 /* timestamp */
407#define TOF_CC 0x0002 /* CC and CCnew are exclusive */
408#define TOF_CCNEW 0x0004
409#define TOF_CCECHO 0x0008
410#define TOF_MSS 0x0010
411#define TOF_SCALE 0x0020
412#define TOF_SACK_PERMITTED 0x0040
413#define TOF_SACK 0x0080
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414 u_int32_t to_tsval;
415 u_int32_t to_tsecr;
416 tcp_cc to_cc; /* holds CC or CCnew */
417 tcp_cc to_ccecho;
418 u_int16_t to_mss;
f23061d4 419 u_int8_t to_requested_s_scale;
16fb1aa4 420 u_int8_t to_nsackblocks;
91489f6b 421 struct raw_sackblock *to_sackblocks;
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422};
423
424struct syncache {
425 inp_gen_t sc_inp_gencnt; /* pointer check */
f23061d4 426 struct tcpcb *sc_tp; /* tcb for listening socket */
984263bc 427 struct mbuf *sc_ipopts; /* source route */
f23061d4 428 struct in_conninfo sc_inc; /* addresses */
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429#define sc_route sc_inc.inc_route
430#define sc_route6 sc_inc.inc6_route
431 u_int32_t sc_tsrecent;
432 tcp_cc sc_cc_send; /* holds CC or CCnew */
433 tcp_cc sc_cc_recv;
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434 tcp_seq sc_irs; /* seq from peer */
435 tcp_seq sc_iss; /* our ISS */
984263bc 436 u_long sc_rxttime; /* retransmit time */
f23061d4 437 u_int16_t sc_rxtslot; /* retransmit counter */
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438 u_int16_t sc_peer_mss; /* peer's MSS */
439 u_int16_t sc_wnd; /* advertised window */
f23061d4 440 u_int8_t sc_requested_s_scale:4,
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441 sc_request_r_scale:4;
442 u_int8_t sc_flags;
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443#define SCF_NOOPT 0x01 /* no TCP options */
444#define SCF_WINSCALE 0x02 /* negotiated window scaling */
445#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
446#define SCF_CC 0x08 /* negotiated CC */
447#define SCF_UNREACH 0x10 /* icmp unreachable received */
448#define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */
449 TAILQ_ENTRY(syncache) sc_hash;
450 TAILQ_ENTRY(syncache) sc_timerq;
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451};
452
453struct syncache_head {
454 TAILQ_HEAD(, syncache) sch_bucket;
455 u_int sch_length;
456};
f23061d4 457
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458/*
459 * The TAO cache entry which is stored in the protocol family specific
460 * portion of the route metrics.
461 */
462struct rmxp_tao {
463 tcp_cc tao_cc; /* latest CC in valid SYN */
464 tcp_cc tao_ccsent; /* latest CC sent to peer */
465 u_short tao_mssopt; /* peer's cached MSS */
f23061d4 466
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467#ifdef notyet
468 u_short tao_flags; /* cache status flags */
469#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */
470#define TAOF_OK 0x0002 /* peer does understand rfc1644 */
471#define TAOF_UNDEF 0 /* we don't know yet */
f23061d4 472#endif
984263bc 473};
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474
475#define rmx_taop(rt) ((struct rmxp_tao *)(rt).rmx_filler)
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476
477#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
478#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
479
480/*
481 * The smoothed round-trip time and estimated variance
482 * are stored as fixed point numbers scaled by the values below.
483 * For convenience, these scales are also used in smoothing the average
484 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
485 * With these scales, srtt has 3 bits to the right of the binary point,
486 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
487 * binary point, and is smoothed with an ALPHA of 0.75.
488 */
489#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
490#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
491#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
492#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
493#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
494
495/*
496 * The initial retransmission should happen at rtt + 4 * rttvar.
497 * Because of the way we do the smoothing, srtt and rttvar
498 * will each average +1/2 tick of bias. When we compute
499 * the retransmit timer, we want 1/2 tick of rounding and
500 * 1 extra tick because of +-1/2 tick uncertainty in the
501 * firing of the timer. The bias will give us exactly the
502 * 1.5 tick we need. But, because the bias is
503 * statistical, we have to test that we don't drop below
504 * the minimum feasible timer (which is 2 ticks).
505 * This version of the macro adapted from a paper by Lawrence
506 * Brakmo and Larry Peterson which outlines a problem caused
507 * by insufficient precision in the original implementation,
508 * which results in inappropriately large RTO values for very
509 * fast networks.
510 */
511#define TCP_REXMTVAL(tp) \
512 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
513 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
514
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515/*
516 * TCB structure exported to user-land via sysctl(3).
517 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
518 * included. Not all of our clients do.
519 */
520#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
521struct xtcpcb {
522 size_t xt_len;
523 struct inpcb xt_inp;
524 struct tcpcb xt_tp;
525 struct xsocket xt_socket;
526 u_quad_t xt_alignment_hack;
527};
528#endif
529
530/*
531 * Names for TCP sysctl objects
532 */
533#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
534#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */
535#define TCPCTL_MSSDFLT 3 /* MSS default */
536#define TCPCTL_STATS 4 /* statistics (read-only) */
537#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
538#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
539#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
540#define TCPCTL_SENDSPACE 8 /* send buffer space */
541#define TCPCTL_RECVSPACE 9 /* receive buffer space */
542#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
543#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
544#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
545#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
546#define TCPCTL_MAXID 14
547
548#define TCPCTL_NAMES { \
549 { 0, 0 }, \
550 { "rfc1323", CTLTYPE_INT }, \
551 { "rfc1644", CTLTYPE_INT }, \
552 { "mssdflt", CTLTYPE_INT }, \
553 { "stats", CTLTYPE_STRUCT }, \
554 { "rttdflt", CTLTYPE_INT }, \
555 { "keepidle", CTLTYPE_INT }, \
556 { "keepintvl", CTLTYPE_INT }, \
557 { "sendspace", CTLTYPE_INT }, \
558 { "recvspace", CTLTYPE_INT }, \
559 { "keepinit", CTLTYPE_INT }, \
560 { "pcblist", CTLTYPE_STRUCT }, \
561 { "delacktime", CTLTYPE_INT }, \
562 { "v6mssdflt", CTLTYPE_INT }, \
563}
564
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565#ifdef _KERNEL
566#ifdef SYSCTL_DECL
567SYSCTL_DECL(_net_inet_tcp);
568#endif
569
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570#define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED)
571
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572TAILQ_HEAD(tcpcbackqhead,tcpcb);
573
d371a63a 574extern struct inpcbinfo tcbinfo[];
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575extern struct tcpcbackqhead tcpcbackq[];
576
984263bc 577extern int tcp_mssdflt; /* XXX */
5b0b9fa5 578extern int tcp_minmss;
984263bc 579extern int tcp_delack_enabled;
984263bc 580extern int path_mtu_discovery;
984263bc 581
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582int tcp_addrcpu(in_addr_t faddr, in_port_t fport,
583 in_addr_t laddr, in_port_t lport);
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584struct lwkt_port *
585 tcp_addrport(in_addr_t faddr, in_port_t fport,
586 in_addr_t laddr, in_port_t lport);
65f3e756 587struct lwkt_port *tcp_addrport0(void);
42a7fc75 588void tcp_canceltimers (struct tcpcb *);
984263bc 589struct tcpcb *
42a7fc75 590 tcp_close (struct tcpcb *);
2b1ce38a 591void tcpmsg_service_loop (void *);
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592void tcp_ctlinput (int, struct sockaddr *, void *);
593int tcp_ctloutput (struct socket *, struct sockopt *);
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594struct lwkt_port *
595 tcp_cport(int cpu);
984263bc 596struct tcpcb *
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597 tcp_drop (struct tcpcb *, int);
598void tcp_drain (void);
599void tcp_fasttimo (void);
984263bc 600struct rmxp_tao *
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601 tcp_gettaocache (struct in_conninfo *);
602void tcp_init (void);
bf82f9b7 603void tcp_thread_init (void);
a00138cb 604void tcp_input (struct mbuf *, ...);
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605void tcp_mss (struct tcpcb *, int);
606int tcp_mssopt (struct tcpcb *);
607void tcp_drop_syn_sent (struct inpcb *, int);
608void tcp_mtudisc (struct inpcb *, int);
984263bc 609struct tcpcb *
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610 tcp_newtcpcb (struct inpcb *);
611int tcp_output (struct tcpcb *);
612void tcp_quench (struct inpcb *, int);
613void tcp_respond (struct tcpcb *, void *,
614 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
984263bc 615struct rtentry *
42a7fc75 616 tcp_rtlookup (struct in_conninfo *);
9a5b142f 617int tcp_sack_bytes_below(struct scoreboard *scb, tcp_seq seq);
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618void tcp_sack_cleanup(struct scoreboard *scb);
619int tcp_sack_ndsack_blocks(struct raw_sackblock *blocks,
620 const int numblocks, tcp_seq snd_una);
621void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen);
622boolean_t
623 tcp_sack_has_sacked(struct scoreboard *scb, u_int amount);
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624void tcp_sack_tcpcb_init(struct tcpcb *tp);
625uint32_t tcp_sack_compute_pipe(struct tcpcb *tp);
626boolean_t
627 tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len,
628 boolean_t *losdup);
629#ifdef later
630void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una,
631 u_int maxseg);
632void tcp_sack_save_scoreboard(struct scoreboard *scb);
633#endif
634void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt);
635void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to);
efd4b327 636void tcp_save_congestion_state(struct tcpcb *tp);
bfdb979e 637void tcp_revert_congestion_state(struct tcpcb *tp);
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638void tcp_setpersist (struct tcpcb *);
639void tcp_slowtimo (void);
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640struct tcptemp *tcp_maketemplate (struct tcpcb *);
641void tcp_freetemplate (struct tcptemp *);
42a7fc75 642void tcp_fillheaders (struct tcpcb *, void *, void *);
bf82f9b7 643struct lwkt_port *
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644 tcp_soport(struct socket *, struct sockaddr *, struct mbuf **);
645struct lwkt_port *
646 tcp_soport_attach(struct socket *);
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647struct lwkt_port *
648 tcp_ctlport(int, struct sockaddr *, void *);
984263bc 649struct tcpcb *
42a7fc75 650 tcp_timers (struct tcpcb *, int);
f3f70f0d 651void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *,
42a7fc75 652 int);
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653void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
654void syncache_init(void);
655void syncache_unreach(struct in_conninfo *, struct tcphdr *);
656int syncache_expand(struct in_conninfo *, struct tcphdr *,
657 struct socket **, struct mbuf *);
658int syncache_add(struct in_conninfo *, struct tcpopt *,
659 struct tcphdr *, struct socket **, struct mbuf *);
660void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
661void syncache_badack(struct in_conninfo *);
662
663extern struct pr_usrreqs tcp_usrreqs;
664extern u_long tcp_sendspace;
665extern u_long tcp_recvspace;
42a7fc75 666tcp_seq tcp_new_isn (struct tcpcb *);
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667
668#endif /* _KERNEL */
669
670#endif /* _NETINET_TCP_VAR_H_ */