tcp: RFC3517bis is now officially RFC6675
[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
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 */
8acdb67c 84extern int tcp_do_rfc1323;
48a4676d 85extern int tcp_low_rtobase;
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86extern int tcp_do_sack;
87extern int tcp_do_smartsack;
1bdfd728 88extern int tcp_do_rescuesack;
a098966f 89extern int tcp_aggressive_rescuesack;
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90extern int tcp_do_rfc6675;
91extern int tcp_rfc6675_rxt;
8acdb67c 92extern int tcp_aggregate_acks;
073ec6c4 93extern int tcp_eifel_rtoinc;
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94
95/* TCP segment queue entry */
96struct tseg_qent {
0f9e45de 97 TAILQ_ENTRY(tseg_qent) tqe_q;
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98 int tqe_len; /* TCP segment data length */
99 struct tcphdr *tqe_th; /* a pointer to tcp header */
100 struct mbuf *tqe_m; /* mbuf contains packet */
101};
0f9e45de 102TAILQ_HEAD(tsegqe_head, tseg_qent);
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103extern int tcp_reass_maxseg;
104extern int tcp_reass_qsize;
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105#ifdef MALLOC_DECLARE
106MALLOC_DECLARE(M_TSEGQ);
107#endif
108
109struct tcptemp {
110 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
111 struct tcphdr tt_t;
112};
113
114#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
115
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116struct raw_sackblock { /* covers [start, end) */
117 tcp_seq rblk_start;
118 tcp_seq rblk_end;
119};
120
121/* maximum number of SACK blocks that will fit in the TCP option space */
122#define MAX_SACK_REPORT_BLOCKS 4
123
124TAILQ_HEAD(sackblock_list, sackblock);
125
126struct scoreboard {
127 int nblocks;
128 struct sackblock_list sackblocks;
129 tcp_seq lostseq; /* passed SACK lost test */
130 struct sackblock *lastfound; /* search hint */
006af0db 131 struct sackblock *freecache; /* one slot free block cache */
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132};
133
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134struct netmsg_tcp_timer;
135
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136/*
137 * Tcp control block, one per tcp; fields:
138 * Organized for 16 byte cacheline efficiency.
139 */
140struct tcpcb {
141 struct tsegqe_head t_segq;
142 int t_dupacks; /* consecutive dup acks recd */
7e4852bb 143 int t_rxtthresh; /* # dup acks to start fast rxt */
2b1ce38a 144 int tt_cpu; /* sanity check the cpu */
c1d3b892 145
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146 struct tcp_callout *tt_rexmt; /* retransmit timer */
147 struct tcp_callout *tt_persist;/* retransmit persistence */
148 struct tcp_callout *tt_keep; /* keepalive */
149 struct tcp_callout *tt_2msl; /* 2*msl TIME_WAIT timer */
150 struct tcp_callout *tt_delack; /* delayed ACK timer */
0f758523 151 struct netmsg_tcp_timer *tt_msg; /* timer message */
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152
153 struct inpcb *t_inpcb; /* back pointer to internet pcb */
154 int t_state; /* state of this connection */
155 u_int t_flags;
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156#define TF_ACKNOW 0x00000001 /* ack peer immediately */
157#define TF_DELACK 0x00000002 /* ack, but try to delay it */
158#define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
159#define TF_NOOPT 0x00000008 /* don't use tcp options */
160#define TF_SENTFIN 0x00000010 /* have sent FIN */
161#define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
162#define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
163#define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
164#define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
91489f6b 165#define TF_SACK_PERMITTED 0x00000200 /* other side said I could SACK */
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166#define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
167#define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
168#define TF_NOPUSH 0x00001000 /* don't push */
f7b29de5 169#define TF_LISTEN 0x00002000 /* listen(2) has been called */
2a0c7c52 170#define TF_SIGNATURE 0x00004000 /* require MD5 digests (RFC2385) */
e2289e66 171#define TF_NCR 0x00008000 /* Non-Congestion Robustness RFC4653 */
8819433a 172#define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
942d88ef 173#define TF_SAWFIN 0x00020000 /* FIN has been seen */
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174#define TF_LASTIDLE 0x00040000 /* connection was previously idle */
175#define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
0339c429 176#define TF_FASTRECOVERY 0x00100000 /* in Fast Recovery */
942d88ef 177#define TF_QUEDFIN 0x00200000 /* FIN has been received */
c1fabe85 178#define TF_XMITNOW 0x00400000 /* Temporarily override Nagle */
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179#define TF_UNUSED008 0x00800000
180#define TF_UNUSED009 0x01000000
c1d3b892 181#define TF_FORCE 0x02000000 /* Set if forcing out a byte */
2b1ce38a 182#define TF_ONOUTPUTQ 0x04000000 /* on t_outputq list */
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183#define TF_UNUSED002 0x08000000
184#define TF_UNUSED003 0x10000000
185#define TF_UNUSED004 0x20000000
efca2b8e 186#define TF_KEEPALIVE 0x40000000 /* temporary keepalive */
46e92930 187#define TF_RXRESIZED 0x80000000 /* rcvbuf was resized */
c1d3b892 188 tcp_seq snd_up; /* send urgent pointer */
3d127502 189 u_long snd_last; /* time last data were sent */
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190
191 tcp_seq snd_una; /* send unacknowledged */
0339c429 192 tcp_seq snd_recover; /* for use with Fast Recovery */
984263bc 193 tcp_seq snd_max; /* highest sequence number sent;
8acdb67c 194 * used to recognize retransmits */
984263bc 195 tcp_seq snd_nxt; /* send next */
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196
197 tcp_seq snd_wl1; /* window update seg seq number */
198 tcp_seq snd_wl2; /* window update seg ack number */
199 tcp_seq iss; /* initial send sequence number */
200 tcp_seq irs; /* initial receive sequence number */
201
202 tcp_seq rcv_nxt; /* receive next */
203 tcp_seq rcv_adv; /* advertised window */
204 u_long rcv_wnd; /* receive window */
205 tcp_seq rcv_up; /* receive urgent pointer */
206
207 u_long snd_wnd; /* send window */
208 u_long snd_cwnd; /* congestion-controlled window */
8acdb67c 209 u_long snd_wacked; /* bytes acked in one send window */
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210 u_long snd_ssthresh; /* snd_cwnd size threshold for
211 * for slow start exponential to
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212 * linear switch */
213
214 int t_rxtcur; /* current retransmit value (ticks) */
215 u_int t_maxseg; /* maximum segment size */
216 int t_srtt; /* smoothed round-trip time */
217 int t_rttvar; /* variance in round-trip time */
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218
219 u_int t_maxopd; /* mss plus options */
220
3d127502 221 u_long t_rcvtime; /* reception inactivity time */
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222 u_long t_starttime; /* time connection was established */
223 int t_rtttime; /* round trip time */
224 tcp_seq t_rtseq; /* sequence number being timed */
225
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226 int t_rxtshift; /* log(2) of rexmt exp. backoff */
227 u_int t_rttmin; /* minimum rtt allowed */
228 u_int t_rttbest; /* best rtt we've seen */
229 u_long t_rttupdated; /* number of times rtt sampled */
230 u_long max_sndwnd; /* largest window peer has offered */
231
232 int t_softerror; /* possible error not yet reported */
233/* out-of-band data */
234 char t_oobflags; /* have some */
235 char t_iobc; /* input character */
236#define TCPOOB_HAVEDATA 0x01
237#define TCPOOB_HADDATA 0x02
8acdb67c 238
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239/* RFC 1323 variables */
240 u_char snd_scale; /* window scaling for send window */
241 u_char rcv_scale; /* window scaling for recv window */
242 u_char request_r_scale; /* pending window scaling */
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243 u_long ts_recent; /* timestamp echo data */
244
245 u_long ts_recent_age; /* when last updated */
246 tcp_seq last_ack_sent;
8acdb67c 247
984263bc 248/* experimental */
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249 u_int rxt_flags;
250#define TRXT_F_REBASERTO 0x0001 /* Recalculate RTO based on new RTT */
0339c429 251#define TRXT_F_WASFRECOVERY 0x0002 /* was in Fast Recovery */
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252#define TRXT_F_FIRSTACCACK 0x0004 /* Look for 1st acceptable ACK. */
253#define TRXT_F_FASTREXMT 0x0008 /* Did Fast Retransmit. */
254#define TRXT_F_EARLYREXMT 0x0010 /* Did Early (Fast) Retransmit. */
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255 int t_srtt_prev; /* adjusted SRTT prior to retransmit */
256 int t_rttvar_prev; /* RTTVAR prior to retransmit */
257 int t_rxtcur_prev; /* rexmt timeout prior to retransmit */
258 tcp_seq snd_max_prev; /* SND_MAX prior to retransmit */
984263bc 259 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
8acdb67c 260 u_long snd_wacked_prev; /* prior bytes acked in send window */
984263bc 261 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
9845754e 262 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
984263bc 263 u_long t_badrxtwin; /* window for retransmit recovery */
efd4b327 264 u_long t_rexmtTS; /* timestamp of last retransmit */
33abdd1c 265 u_char snd_limited; /* segments limited transmitted */
91489f6b 266
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267 u_int sack_flags;
268#define TSACK_F_SACKRESCUED 0x0001 /* sent rescue SACK recovery data */
269#define TSACK_F_DUPSEG 0x0002 /* last seg a duplicate */
270#define TSACK_F_ENCLOSESEG 0x0004 /* enclosing SACK block */
271#define TSACK_F_SACKLEFT 0x0008 /* send SACK blocks from left side */
91489f6b 272 tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */
1bdfd728 273 tcp_seq rexmt_rescue; /* rescue SACKED sequence number */
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274 tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */
275 struct scoreboard scb; /* sack scoreboard */
276 struct raw_sackblock reportblk; /* incoming segment or D-SACK block */
277 struct raw_sackblock encloseblk;
278 int nsackhistory;
279 struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */
c7e6499a 280
2b1ce38a 281 TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */
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282
283 /* bandwith limitation */
284 u_long snd_bandwidth; /* calculated bandwidth or 0 */
285 u_long snd_bwnd; /* bandwidth-controlled window */
286 int t_bw_rtttime; /* used for bandwidth calculation */
287 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
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288
289/* anti DoS counters */
290 u_long rcv_second; /* start of interval second */
291 u_long rcv_pps; /* received packets per second */
292 u_long rcv_byps; /* received bytes per second */
293
294 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
295 int rfbuf_cnt; /* recv buffer autoscaling byte count */
2ce132be 296
340ba84c 297 int t_keepinit; /* time to establish connection */
7ea3a353 298
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299 int t_keepidle; /* time before keepalive probes begin */
300 int t_keepintvl; /* time between keepalive probes */
301 int t_keepcnt; /* maximum number of keepalive probes */
302 int t_maxidle; /* time to drop after starting probes */
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303
304 int t_rxtsyn; /* time spent in SYN or SYN|ACK rexmt */
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305};
306
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307#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
308#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
309#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
310
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311#ifdef TCP_SIGNATURE
312/*
313 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
314 * for SADB verification and lookup.
315 */
316#define TCP_SIGLEN 16 /* length of computed digest in bytes */
317#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
318#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
319/*
320 * Only a single SA per host may be specified at this time. An SPI is
321 * needed in order for the KEY_ALLOCSA() lookup to work.
322 */
323#define TCP_SIG_SPI 0x1000
324#endif /* TCP_SIGNATURE */
325
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326/*
327 * TCP statistics.
328 */
329struct tcp_stats {
330 u_long tcps_connattempt; /* connections initiated */
331 u_long tcps_accepts; /* connections accepted */
332 u_long tcps_connects; /* connections established */
333 u_long tcps_drops; /* connections dropped */
334 u_long tcps_conndrops; /* embryonic connections dropped */
5b0b9fa5 335 u_long tcps_minmssdrops; /* average minmss too low drops */
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336 u_long tcps_closed; /* conn. closed (includes drops) */
337 u_long tcps_segstimed; /* segs where we tried to get rtt */
338 u_long tcps_rttupdated; /* times we succeeded */
339 u_long tcps_delack; /* delayed acks sent */
340 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
341 u_long tcps_rexmttimeo; /* retransmit timeouts */
342 u_long tcps_persisttimeo; /* persist timeouts */
343 u_long tcps_keeptimeo; /* keepalive timeouts */
344 u_long tcps_keepprobe; /* keepalive probes sent */
345 u_long tcps_keepdrops; /* connections dropped in keepalive */
346
347 u_long tcps_sndtotal; /* total packets sent */
348 u_long tcps_sndpack; /* data packets sent */
349 u_long tcps_sndbyte; /* data bytes sent */
350 u_long tcps_sndrexmitpack; /* data packets retransmitted */
351 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
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352 u_long tcps_sndsackrtopack; /* packets sent by SACK after RTO */
353 u_long tcps_sndsackrtobyte; /* bytes sent by SACK after RTO */
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354 u_long tcps_sndfastrexmit; /* Fast Retransmissions */
355 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */
356 u_long tcps_sndlimited; /* Limited Transmit packets */
357 u_long tcps_sndrtobad; /* spurious RTO retransmissions */
358 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */
359 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions,
360 a subset of tcps_sndfastrexmitbad */
361 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */
362 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */
363 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */
364 u_long tcps_sndacks; /* ack-only packets sent */
365 u_long tcps_sndprobe; /* window probes sent */
366 u_long tcps_sndurg; /* packets sent with URG only */
367 u_long tcps_sndwinup; /* window update-only packets sent */
368 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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369 u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */
370 u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */
371 u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */
372 u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */
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373 u_long tcps_sndsackopt; /* SACK options sent */
374 u_long tcps_snddsackopt; /* D-SACK options sent */
3d127502 375 u_long tcps_sndidle; /* sending idle detected */
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376 u_long tcps_sackrescue; /* SACK rescue data packets sent */
377 u_long tcps_sackrescue_try; /* SACK rescues attempted */
073ec6c4 378 u_long tcps_eifelresponse; /* Eifel responses */
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379
380 u_long tcps_rcvtotal; /* total packets received */
381 u_long tcps_rcvpack; /* packets received in sequence */
382 u_long tcps_rcvbyte; /* bytes received in sequence */
383 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
384 u_long tcps_rcvbadoff; /* packets received with bad offset */
385 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
386 u_long tcps_rcvshort; /* packets received too short */
387 u_long tcps_rcvduppack; /* duplicate-only packets received */
388 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
389 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
390 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
391 u_long tcps_rcvoopack; /* out-of-order packets received */
392 u_long tcps_rcvoobyte; /* out-of-order bytes received */
393 u_long tcps_rcvpackafterwin; /* packets with data after window */
394 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
395 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
396 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
397 u_long tcps_rcvdupack; /* rcvd duplicate acks */
398 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
399 u_long tcps_rcvackpack; /* rcvd ack packets */
400 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
401 u_long tcps_rcvwinupd; /* rcvd window update packets */
402 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
9de1f696 403 u_long tcps_pawsaccept; /* segments accepted, PAWS tolerance */
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404 u_long tcps_predack; /* times hdr predict ok for acks */
405 u_long tcps_preddat; /* times hdr predict ok for data pkts */
406 u_long tcps_pcbcachemiss;
407 u_long tcps_cachedrtt; /* times cached RTT in route updated */
408 u_long tcps_cachedrttvar; /* times cached rttvar updated */
409 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
410 u_long tcps_usedrtt; /* times RTT initialized from route */
411 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
412 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
413 u_long tcps_persistdrop; /* timeout in persist state */
414 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
415 u_long tcps_mturesent; /* resends due to MTU discovery */
416 u_long tcps_listendrop; /* listen queue overflows */
02cc2f35 417 u_long tcps_rcvbadsackopt; /* rcvd illegal SACK options */
9ba0ed2f 418 u_long tcps_sackrenege; /* times other side reneged */
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419
420 u_long tcps_sacksbupdate; /* times SACK scoreboard updated */
421 u_long tcps_sacksboverflow; /* times SACK scoreboard overflowed */
422 u_long tcps_sacksbreused; /* times SACK sb-block reused */
423 u_long tcps_sacksbfailed; /* times SACK sb update failed */
9ba0ed2f 424 u_long tcps_sacksbfast; /* times SACK sb-block uses cache */
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425
426 u_long tcps_sc_added; /* entry added to syncache */
427 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
428 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
429 u_long tcps_sc_dropped; /* could not reply to packet */
430 u_long tcps_sc_completed; /* successful extraction of entry */
431 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
432 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
433 u_long tcps_sc_reset; /* RST removed entry from syncache */
434 u_long tcps_sc_stale; /* timed out or listen socket gone */
435 u_long tcps_sc_aborted; /* syncache entry aborted */
436 u_long tcps_sc_badack; /* removed due to bad ACK */
437 u_long tcps_sc_unreach; /* ICMP unreachable received */
438 u_long tcps_sc_zonefail; /* zalloc() failed */
439 u_long tcps_sc_sendcookie; /* SYN cookie sent */
440 u_long tcps_sc_recvcookie; /* SYN cookie received */
441};
442
70068ffd
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443#ifdef _KERNEL
444
445#if defined(SMP)
446#define tcpstat tcpstats_percpu[mycpuid]
447#else
448#define tcpstat tcpstats_percpu[0]
449#endif
450
451struct sockopt;
452
453extern struct tcp_stats tcpstats_percpu[MAXCPU];
454
455static const int tcprexmtthresh = 3;
456#endif
457
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458/*
459 * Structure to hold TCP options that are only used during segment
460 * processing (in tcp_input), but not held in the tcpcb.
461 * It's basically used to reduce the number of parameters
462 * to tcp_dooptions.
463 */
464struct tcpopt {
0a832381 465 u_int to_flags; /* which options are present */
569e1755 466#define TOF_TS 0x0001 /* timestamp */
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JH
467#define TOF_MSS 0x0010
468#define TOF_SCALE 0x0020
469#define TOF_SACK_PERMITTED 0x0040
470#define TOF_SACK 0x0080
569e1755
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471#define TOF_SIGNATURE 0x0100 /* signature option present */
472#define TOF_SIGLEN 0x0200 /* signature length valid (RFC2385) */
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473#define TOF_DSACK 0x0400 /* D-SACK */
474#define TOF_SACK_REDUNDANT 0x0800 /* all SACK blocks are known */
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475 u_int32_t to_tsval;
476 u_int32_t to_tsecr;
984263bc 477 u_int16_t to_mss;
f23061d4 478 u_int8_t to_requested_s_scale;
16fb1aa4 479 u_int8_t to_nsackblocks;
91489f6b 480 struct raw_sackblock *to_sackblocks;
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481};
482
483struct syncache {
484 inp_gen_t sc_inp_gencnt; /* pointer check */
f23061d4 485 struct tcpcb *sc_tp; /* tcb for listening socket */
984263bc 486 struct mbuf *sc_ipopts; /* source route */
f23061d4 487 struct in_conninfo sc_inc; /* addresses */
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488#define sc_route sc_inc.inc_route
489#define sc_route6 sc_inc.inc6_route
490 u_int32_t sc_tsrecent;
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491 tcp_seq sc_irs; /* seq from peer */
492 tcp_seq sc_iss; /* our ISS */
984263bc 493 u_long sc_rxttime; /* retransmit time */
f23061d4 494 u_int16_t sc_rxtslot; /* retransmit counter */
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495 u_int16_t sc_peer_mss; /* peer's MSS */
496 u_int16_t sc_wnd; /* advertised window */
f23061d4 497 u_int8_t sc_requested_s_scale:4,
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498 sc_request_r_scale:4;
499 u_int8_t sc_flags;
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JH
500#define SCF_NOOPT 0x01 /* no TCP options */
501#define SCF_WINSCALE 0x02 /* negotiated window scaling */
502#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
d5082e3d 503#define SCF_UNUSED 0x08 /* unused */
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JH
504#define SCF_UNREACH 0x10 /* icmp unreachable received */
505#define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */
be34e534 506#define SCF_SIGNATURE 0x40 /* send MD5 digests */
c1d0893d 507#define SCF_MARKER 0x80 /* not a real entry */
d5082e3d 508 int sc_rxtused; /* time spent in SYN|ACK rxt */
df1d2774 509 u_long sc_sndwnd; /* send window */
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510 TAILQ_ENTRY(syncache) sc_hash;
511 TAILQ_ENTRY(syncache) sc_timerq;
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512};
513
514struct syncache_head {
515 TAILQ_HEAD(, syncache) sch_bucket;
516 u_int sch_length;
517};
f23061d4 518
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519#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
520#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
521
522/*
523 * The smoothed round-trip time and estimated variance
524 * are stored as fixed point numbers scaled by the values below.
525 * For convenience, these scales are also used in smoothing the average
526 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
527 * With these scales, srtt has 3 bits to the right of the binary point,
528 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
529 * binary point, and is smoothed with an ALPHA of 0.75.
530 */
531#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
532#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
533#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
534#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
535#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
536
537/*
538 * The initial retransmission should happen at rtt + 4 * rttvar.
539 * Because of the way we do the smoothing, srtt and rttvar
540 * will each average +1/2 tick of bias. When we compute
541 * the retransmit timer, we want 1/2 tick of rounding and
542 * 1 extra tick because of +-1/2 tick uncertainty in the
543 * firing of the timer. The bias will give us exactly the
544 * 1.5 tick we need. But, because the bias is
545 * statistical, we have to test that we don't drop below
546 * the minimum feasible timer (which is 2 ticks).
547 * This version of the macro adapted from a paper by Lawrence
548 * Brakmo and Larry Peterson which outlines a problem caused
549 * by insufficient precision in the original implementation,
550 * which results in inappropriately large RTO values for very
551 * fast networks.
552 */
553#define TCP_REXMTVAL(tp) \
554 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
555 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
556
557/*
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558 * TCB structure exported to user-land via sysctl(3).
559 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
560 * included. Not all of our clients do.
561 */
562#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
563struct xtcpcb {
564 size_t xt_len;
565 struct inpcb xt_inp;
566 struct tcpcb xt_tp;
567 struct xsocket xt_socket;
568 u_quad_t xt_alignment_hack;
569};
570#endif
571
572/*
573 * Names for TCP sysctl objects
574 */
575#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
27b8aee3 576/* 2 was TCPCTL_DO_RFC1644 */
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577#define TCPCTL_MSSDFLT 3 /* MSS default */
578#define TCPCTL_STATS 4 /* statistics (read-only) */
579#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
580#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
581#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
582#define TCPCTL_SENDSPACE 8 /* send buffer space */
583#define TCPCTL_RECVSPACE 9 /* receive buffer space */
584#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
585#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
586#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
587#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
588#define TCPCTL_MAXID 14
589
590#define TCPCTL_NAMES { \
591 { 0, 0 }, \
592 { "rfc1323", CTLTYPE_INT }, \
27b8aee3 593 { "reserved", CTLTYPE_INT}, /* was rfc1644 */ \
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594 { "mssdflt", CTLTYPE_INT }, \
595 { "stats", CTLTYPE_STRUCT }, \
596 { "rttdflt", CTLTYPE_INT }, \
597 { "keepidle", CTLTYPE_INT }, \
598 { "keepintvl", CTLTYPE_INT }, \
599 { "sendspace", CTLTYPE_INT }, \
600 { "recvspace", CTLTYPE_INT }, \
601 { "keepinit", CTLTYPE_INT }, \
602 { "pcblist", CTLTYPE_STRUCT }, \
603 { "delacktime", CTLTYPE_INT }, \
604 { "v6mssdflt", CTLTYPE_INT }, \
605}
606
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607#ifdef _KERNEL
608#ifdef SYSCTL_DECL
609SYSCTL_DECL(_net_inet_tcp);
610#endif
611
91489f6b 612#define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED)
e2289e66 613#define TCP_DO_NCR(tp) (((tp)->t_flags & TF_NCR) && TCP_DO_SACK((tp)))
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614#define TCP_SACK_BLKEND(len, thflags) \
615 ((len) + (((thflags) & TH_FIN) != 0))
91489f6b 616
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MD
617TAILQ_HEAD(tcpcbackqhead,tcpcb);
618
d371a63a 619extern struct inpcbinfo tcbinfo[];
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620extern struct tcpcbackqhead tcpcbackq[];
621
984263bc 622extern int tcp_mssdflt; /* XXX */
5b0b9fa5 623extern int tcp_minmss;
984263bc 624extern int tcp_delack_enabled;
984263bc 625extern int path_mtu_discovery;
984263bc 626
5f60906c 627struct ip;
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628union netmsg;
629
d371a63a
JH
630int tcp_addrcpu(in_addr_t faddr, in_port_t fport,
631 in_addr_t laddr, in_port_t lport);
7fe56515
JH
632struct lwkt_port *
633 tcp_addrport(in_addr_t faddr, in_port_t fport,
634 in_addr_t laddr, in_port_t lport);
65f3e756 635struct lwkt_port *tcp_addrport0(void);
42a7fc75 636void tcp_canceltimers (struct tcpcb *);
984263bc 637struct tcpcb *
42a7fc75 638 tcp_close (struct tcpcb *);
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639void tcp_ctlinput(union netmsg *);
640void tcp_ctloutput(union netmsg *);
984263bc 641struct tcpcb *
42a7fc75
RG
642 tcp_drop (struct tcpcb *, int);
643void tcp_drain (void);
42a7fc75 644void tcp_init (void);
bf82f9b7 645void tcp_thread_init (void);
002c1265 646int tcp_input (struct mbuf **, int *, int);
42a7fc75
RG
647void tcp_mss (struct tcpcb *, int);
648int tcp_mssopt (struct tcpcb *);
649void tcp_drop_syn_sent (struct inpcb *, int);
650void tcp_mtudisc (struct inpcb *, int);
984263bc 651struct tcpcb *
42a7fc75
RG
652 tcp_newtcpcb (struct inpcb *);
653int tcp_output (struct tcpcb *);
654void tcp_quench (struct inpcb *, int);
655void tcp_respond (struct tcpcb *, void *,
656 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
984263bc 657struct rtentry *
42a7fc75 658 tcp_rtlookup (struct in_conninfo *);
aaf34417 659int tcp_sack_bytes_below(const struct scoreboard *scb, tcp_seq seq);
006af0db 660void tcp_sack_destroy(struct scoreboard *scb);
f616e306 661void tcp_sack_discard(struct tcpcb *tp);
d58ca578 662void tcp_sack_report_cleanup(struct tcpcb *tp);
aaf34417 663int tcp_sack_ndsack_blocks(const struct raw_sackblock *blocks,
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JH
664 const int numblocks, tcp_seq snd_una);
665void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen);
666boolean_t
aaf34417 667 tcp_sack_has_sacked(const struct scoreboard *scb, u_int amount);
91489f6b 668void tcp_sack_tcpcb_init(struct tcpcb *tp);
aaf34417 669uint32_t tcp_sack_compute_pipe(const struct tcpcb *tp);
91489f6b
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670boolean_t
671 tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len,
1bdfd728 672 boolean_t *rescue);
ffe35e17 673boolean_t
aaf34417 674 tcp_sack_islost(const struct scoreboard *scb, tcp_seq seq);
e2289e66
SZ
675void tcp_sack_update_lostseq(struct scoreboard *scb, tcp_seq snd_una,
676 u_int maxseg, int rxtthresh);
91489f6b
JH
677#ifdef later
678void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una,
679 u_int maxseg);
680void tcp_sack_save_scoreboard(struct scoreboard *scb);
681#endif
682void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt);
aaf34417 683uint32_t tcp_sack_first_unsacked_len(const struct tcpcb *tp);
91489f6b 684void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to);
efd4b327 685void tcp_save_congestion_state(struct tcpcb *tp);
bfdb979e 686void tcp_revert_congestion_state(struct tcpcb *tp);
42a7fc75 687void tcp_setpersist (struct tcpcb *);
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MD
688struct tcptemp *tcp_maketemplate (struct tcpcb *);
689void tcp_freetemplate (struct tcptemp *);
5f60906c 690void tcp_fillheaders (struct tcpcb *, void *, void *, boolean_t);
bf82f9b7 691struct lwkt_port *
48e7b118
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692 tcp_soport(struct socket *, struct sockaddr *, struct mbuf **);
693struct lwkt_port *
e3873585 694 tcp_ctlport(int, struct sockaddr *, void *);
984263bc 695struct tcpcb *
42a7fc75 696 tcp_timers (struct tcpcb *, int);
f3f70f0d 697void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *,
42a7fc75 698 int);
984263bc 699void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
c01148a3 700u_long tcp_initial_window(struct tcpcb *tp);
0ecd93f9 701void tcp_timer_keep_activity(struct tcpcb *tp, int thflags);
5f60906c
SZ
702boolean_t
703 tcp_tso_pullup(struct mbuf **mp, int hoff, struct ip **ip, int *iphlen,
704 struct tcphdr **th, int *thoff);
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MD
705void syncache_init(void);
706void syncache_unreach(struct in_conninfo *, struct tcphdr *);
707int syncache_expand(struct in_conninfo *, struct tcphdr *,
708 struct socket **, struct mbuf *);
709int syncache_add(struct in_conninfo *, struct tcpopt *,
b09567cc 710 struct tcphdr *, struct socket *, struct mbuf *);
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MD
711void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
712void syncache_badack(struct in_conninfo *);
e5fe3477
MD
713void syncache_destroy(struct tcpcb *tp);
714
b1992928
MD
715#ifdef TCP_SIGNATURE
716int tcpsignature_apply(void *fstate, void *data, unsigned int len);
717int tcpsignature_compute(struct mbuf *m, int len, int tcpoptlen,
718 u_char *buf, u_int direction);
719#endif /* TCP_SIGNATURE */
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720
721extern struct pr_usrreqs tcp_usrreqs;
722extern u_long tcp_sendspace;
723extern u_long tcp_recvspace;
42a7fc75 724tcp_seq tcp_new_isn (struct tcpcb *);
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MD
725
726#endif /* _KERNEL */
727
728#endif /* _NETINET_TCP_VAR_H_ */