tcp: Allow per-tcpcb keepintvl and keepcnt
[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;
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85extern int tcp_do_rfc3390;
86extern int tcp_do_sack;
87extern int tcp_do_smartsack;
88extern int tcp_aggregate_acks;
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89
90/* TCP segment queue entry */
91struct tseg_qent {
92 LIST_ENTRY(tseg_qent) tqe_q;
93 int tqe_len; /* TCP segment data length */
94 struct tcphdr *tqe_th; /* a pointer to tcp header */
95 struct mbuf *tqe_m; /* mbuf contains packet */
96};
97LIST_HEAD(tsegqe_head, tseg_qent);
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98extern int tcp_reass_maxseg;
99extern int tcp_reass_qsize;
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100#ifdef MALLOC_DECLARE
101MALLOC_DECLARE(M_TSEGQ);
102#endif
103
104struct tcptemp {
105 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
106 struct tcphdr tt_t;
107};
108
109#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
110
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111struct raw_sackblock { /* covers [start, end) */
112 tcp_seq rblk_start;
113 tcp_seq rblk_end;
114};
115
116/* maximum number of SACK blocks that will fit in the TCP option space */
117#define MAX_SACK_REPORT_BLOCKS 4
118
119TAILQ_HEAD(sackblock_list, sackblock);
120
121struct scoreboard {
122 int nblocks;
123 struct sackblock_list sackblocks;
124 tcp_seq lostseq; /* passed SACK lost test */
125 struct sackblock *lastfound; /* search hint */
126};
127
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128struct netmsg_tcp_timer;
129
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130/*
131 * Tcp control block, one per tcp; fields:
132 * Organized for 16 byte cacheline efficiency.
133 */
134struct tcpcb {
135 struct tsegqe_head t_segq;
136 int t_dupacks; /* consecutive dup acks recd */
2b1ce38a 137 int tt_cpu; /* sanity check the cpu */
c1d3b892 138
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139 struct tcp_callout *tt_rexmt; /* retransmit timer */
140 struct tcp_callout *tt_persist;/* retransmit persistence */
141 struct tcp_callout *tt_keep; /* keepalive */
142 struct tcp_callout *tt_2msl; /* 2*msl TIME_WAIT timer */
143 struct tcp_callout *tt_delack; /* delayed ACK timer */
0f758523 144 struct netmsg_tcp_timer *tt_msg; /* timer message */
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145
146 struct inpcb *t_inpcb; /* back pointer to internet pcb */
147 int t_state; /* state of this connection */
148 u_int t_flags;
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149#define TF_ACKNOW 0x00000001 /* ack peer immediately */
150#define TF_DELACK 0x00000002 /* ack, but try to delay it */
151#define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
152#define TF_NOOPT 0x00000008 /* don't use tcp options */
153#define TF_SENTFIN 0x00000010 /* have sent FIN */
154#define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
155#define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
156#define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
157#define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
91489f6b 158#define TF_SACK_PERMITTED 0x00000200 /* other side said I could SACK */
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159#define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
160#define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
161#define TF_NOPUSH 0x00001000 /* don't push */
f7b29de5 162#define TF_LISTEN 0x00002000 /* listen(2) has been called */
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163#define TF_SIGNATURE 0x00004000 /* require MD5 digests (RFC2385) */
164#define TF_FASTKEEP 0x00008000 /* use a faster tcp_keepidle */
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165#define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
166#define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */
167#define TF_LASTIDLE 0x00040000 /* connection was previously idle */
168#define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
169#define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */
170#define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */
171#define TF_FIRSTACCACK 0x00400000 /* Look for 1st acceptable ACK. */
172#define TF_FASTREXMT 0x00800000 /* Did Fast Retransmit. */
173#define TF_EARLYREXMT 0x01000000 /* Did Early (Fast) Retransmit. */
c1d3b892 174#define TF_FORCE 0x02000000 /* Set if forcing out a byte */
2b1ce38a 175#define TF_ONOUTPUTQ 0x04000000 /* on t_outputq list */
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176#define TF_DUPSEG 0x08000000 /* last seg a duplicate */
177#define TF_ENCLOSESEG 0x10000000 /* enclosing SACK block */
178#define TF_SACKLEFT 0x20000000 /* send SACK blocks from left side */
efca2b8e 179#define TF_KEEPALIVE 0x40000000 /* temporary keepalive */
46e92930 180#define TF_RXRESIZED 0x80000000 /* rcvbuf was resized */
c1d3b892 181 tcp_seq snd_up; /* send urgent pointer */
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182
183 tcp_seq snd_una; /* send unacknowledged */
c1d3b892 184 tcp_seq snd_recover; /* for use with NewReno Fast Recovery */
984263bc 185 tcp_seq snd_max; /* highest sequence number sent;
8acdb67c 186 * used to recognize retransmits */
984263bc 187 tcp_seq snd_nxt; /* send next */
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188
189 tcp_seq snd_wl1; /* window update seg seq number */
190 tcp_seq snd_wl2; /* window update seg ack number */
191 tcp_seq iss; /* initial send sequence number */
192 tcp_seq irs; /* initial receive sequence number */
193
194 tcp_seq rcv_nxt; /* receive next */
195 tcp_seq rcv_adv; /* advertised window */
196 u_long rcv_wnd; /* receive window */
197 tcp_seq rcv_up; /* receive urgent pointer */
198
199 u_long snd_wnd; /* send window */
200 u_long snd_cwnd; /* congestion-controlled window */
8acdb67c 201 u_long snd_wacked; /* bytes acked in one send window */
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202 u_long snd_ssthresh; /* snd_cwnd size threshold for
203 * for slow start exponential to
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204 * linear switch */
205
206 int t_rxtcur; /* current retransmit value (ticks) */
207 u_int t_maxseg; /* maximum segment size */
208 int t_srtt; /* smoothed round-trip time */
209 int t_rttvar; /* variance in round-trip time */
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210
211 u_int t_maxopd; /* mss plus options */
212
213 u_long t_rcvtime; /* inactivity time */
214 u_long t_starttime; /* time connection was established */
215 int t_rtttime; /* round trip time */
216 tcp_seq t_rtseq; /* sequence number being timed */
217
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218 int t_rxtshift; /* log(2) of rexmt exp. backoff */
219 u_int t_rttmin; /* minimum rtt allowed */
220 u_int t_rttbest; /* best rtt we've seen */
221 u_long t_rttupdated; /* number of times rtt sampled */
222 u_long max_sndwnd; /* largest window peer has offered */
223
224 int t_softerror; /* possible error not yet reported */
225/* out-of-band data */
226 char t_oobflags; /* have some */
227 char t_iobc; /* input character */
228#define TCPOOB_HAVEDATA 0x01
229#define TCPOOB_HADDATA 0x02
8acdb67c 230
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231/* RFC 1323 variables */
232 u_char snd_scale; /* window scaling for send window */
233 u_char rcv_scale; /* window scaling for recv window */
234 u_char request_r_scale; /* pending window scaling */
235 u_char requested_s_scale;
236 u_long ts_recent; /* timestamp echo data */
237
238 u_long ts_recent_age; /* when last updated */
239 tcp_seq last_ack_sent;
8acdb67c 240
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241/* experimental */
242 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
8acdb67c 243 u_long snd_wacked_prev; /* prior bytes acked in send window */
984263bc 244 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
9845754e 245 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
984263bc 246 u_long t_badrxtwin; /* window for retransmit recovery */
efd4b327 247 u_long t_rexmtTS; /* timestamp of last retransmit */
33abdd1c 248 u_char snd_limited; /* segments limited transmitted */
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249
250 tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */
251 tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */
252 struct scoreboard scb; /* sack scoreboard */
253 struct raw_sackblock reportblk; /* incoming segment or D-SACK block */
254 struct raw_sackblock encloseblk;
255 int nsackhistory;
256 struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */
2b1ce38a 257 TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */
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258
259 /* bandwith limitation */
260 u_long snd_bandwidth; /* calculated bandwidth or 0 */
261 u_long snd_bwnd; /* bandwidth-controlled window */
262 int t_bw_rtttime; /* used for bandwidth calculation */
263 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
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264
265/* anti DoS counters */
266 u_long rcv_second; /* start of interval second */
267 u_long rcv_pps; /* received packets per second */
268 u_long rcv_byps; /* received bytes per second */
269
270 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
271 int rfbuf_cnt; /* recv buffer autoscaling byte count */
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272
273 int t_keepinit;
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274
275 int t_keepidle;
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276 int t_keepintvl;
277 int t_keepcnt;
278 int t_maxidle;
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279};
280
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281#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
282#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
283#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
284
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285#ifdef TCP_SIGNATURE
286/*
287 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
288 * for SADB verification and lookup.
289 */
290#define TCP_SIGLEN 16 /* length of computed digest in bytes */
291#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
292#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
293/*
294 * Only a single SA per host may be specified at this time. An SPI is
295 * needed in order for the KEY_ALLOCSA() lookup to work.
296 */
297#define TCP_SIG_SPI 0x1000
298#endif /* TCP_SIGNATURE */
299
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300/*
301 * TCP statistics.
302 */
303struct tcp_stats {
304 u_long tcps_connattempt; /* connections initiated */
305 u_long tcps_accepts; /* connections accepted */
306 u_long tcps_connects; /* connections established */
307 u_long tcps_drops; /* connections dropped */
308 u_long tcps_conndrops; /* embryonic connections dropped */
5b0b9fa5 309 u_long tcps_minmssdrops; /* average minmss too low drops */
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310 u_long tcps_closed; /* conn. closed (includes drops) */
311 u_long tcps_segstimed; /* segs where we tried to get rtt */
312 u_long tcps_rttupdated; /* times we succeeded */
313 u_long tcps_delack; /* delayed acks sent */
314 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
315 u_long tcps_rexmttimeo; /* retransmit timeouts */
316 u_long tcps_persisttimeo; /* persist timeouts */
317 u_long tcps_keeptimeo; /* keepalive timeouts */
318 u_long tcps_keepprobe; /* keepalive probes sent */
319 u_long tcps_keepdrops; /* connections dropped in keepalive */
320
321 u_long tcps_sndtotal; /* total packets sent */
322 u_long tcps_sndpack; /* data packets sent */
323 u_long tcps_sndbyte; /* data bytes sent */
324 u_long tcps_sndrexmitpack; /* data packets retransmitted */
325 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
326 u_long tcps_sndfastrexmit; /* Fast Retransmissions */
327 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */
328 u_long tcps_sndlimited; /* Limited Transmit packets */
329 u_long tcps_sndrtobad; /* spurious RTO retransmissions */
330 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */
331 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions,
332 a subset of tcps_sndfastrexmitbad */
333 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */
334 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */
335 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */
336 u_long tcps_sndacks; /* ack-only packets sent */
337 u_long tcps_sndprobe; /* window probes sent */
338 u_long tcps_sndurg; /* packets sent with URG only */
339 u_long tcps_sndwinup; /* window update-only packets sent */
340 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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341 u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */
342 u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */
343 u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */
344 u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */
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345
346 u_long tcps_rcvtotal; /* total packets received */
347 u_long tcps_rcvpack; /* packets received in sequence */
348 u_long tcps_rcvbyte; /* bytes received in sequence */
349 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
350 u_long tcps_rcvbadoff; /* packets received with bad offset */
351 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
352 u_long tcps_rcvshort; /* packets received too short */
353 u_long tcps_rcvduppack; /* duplicate-only packets received */
354 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
355 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
356 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
357 u_long tcps_rcvoopack; /* out-of-order packets received */
358 u_long tcps_rcvoobyte; /* out-of-order bytes received */
359 u_long tcps_rcvpackafterwin; /* packets with data after window */
360 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
361 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
362 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
363 u_long tcps_rcvdupack; /* rcvd duplicate acks */
364 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
365 u_long tcps_rcvackpack; /* rcvd ack packets */
366 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
367 u_long tcps_rcvwinupd; /* rcvd window update packets */
368 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
369 u_long tcps_predack; /* times hdr predict ok for acks */
370 u_long tcps_preddat; /* times hdr predict ok for data pkts */
371 u_long tcps_pcbcachemiss;
372 u_long tcps_cachedrtt; /* times cached RTT in route updated */
373 u_long tcps_cachedrttvar; /* times cached rttvar updated */
374 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
375 u_long tcps_usedrtt; /* times RTT initialized from route */
376 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
377 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
378 u_long tcps_persistdrop; /* timeout in persist state */
379 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
380 u_long tcps_mturesent; /* resends due to MTU discovery */
381 u_long tcps_listendrop; /* listen queue overflows */
382
383 u_long tcps_sc_added; /* entry added to syncache */
384 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
385 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
386 u_long tcps_sc_dropped; /* could not reply to packet */
387 u_long tcps_sc_completed; /* successful extraction of entry */
388 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
389 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
390 u_long tcps_sc_reset; /* RST removed entry from syncache */
391 u_long tcps_sc_stale; /* timed out or listen socket gone */
392 u_long tcps_sc_aborted; /* syncache entry aborted */
393 u_long tcps_sc_badack; /* removed due to bad ACK */
394 u_long tcps_sc_unreach; /* ICMP unreachable received */
395 u_long tcps_sc_zonefail; /* zalloc() failed */
396 u_long tcps_sc_sendcookie; /* SYN cookie sent */
397 u_long tcps_sc_recvcookie; /* SYN cookie received */
398};
399
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400#ifdef _KERNEL
401
402#if defined(SMP)
403#define tcpstat tcpstats_percpu[mycpuid]
404#else
405#define tcpstat tcpstats_percpu[0]
406#endif
407
408struct sockopt;
409
410extern struct tcp_stats tcpstats_percpu[MAXCPU];
411
412static const int tcprexmtthresh = 3;
413#endif
414
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415/*
416 * Structure to hold TCP options that are only used during segment
417 * processing (in tcp_input), but not held in the tcpcb.
418 * It's basically used to reduce the number of parameters
419 * to tcp_dooptions.
420 */
421struct tcpopt {
422 u_long to_flags; /* which options are present */
91489f6b 423#define TOF_TS 0x0001 /* timestamp */
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424#define TOF_MSS 0x0010
425#define TOF_SCALE 0x0020
426#define TOF_SACK_PERMITTED 0x0040
427#define TOF_SACK 0x0080
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428#define TOF_SIGNATURE 0x0100 /* signature option present */
429#define TOF_SIGLEN 0x0200 /* sigature length valid (RFC2385) */
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430 u_int32_t to_tsval;
431 u_int32_t to_tsecr;
984263bc 432 u_int16_t to_mss;
f23061d4 433 u_int8_t to_requested_s_scale;
16fb1aa4 434 u_int8_t to_nsackblocks;
91489f6b 435 struct raw_sackblock *to_sackblocks;
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436};
437
438struct syncache {
439 inp_gen_t sc_inp_gencnt; /* pointer check */
f23061d4 440 struct tcpcb *sc_tp; /* tcb for listening socket */
984263bc 441 struct mbuf *sc_ipopts; /* source route */
f23061d4 442 struct in_conninfo sc_inc; /* addresses */
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443#define sc_route sc_inc.inc_route
444#define sc_route6 sc_inc.inc6_route
445 u_int32_t sc_tsrecent;
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446 tcp_seq sc_irs; /* seq from peer */
447 tcp_seq sc_iss; /* our ISS */
984263bc 448 u_long sc_rxttime; /* retransmit time */
f23061d4 449 u_int16_t sc_rxtslot; /* retransmit counter */
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450 u_int16_t sc_peer_mss; /* peer's MSS */
451 u_int16_t sc_wnd; /* advertised window */
f23061d4 452 u_int8_t sc_requested_s_scale:4,
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453 sc_request_r_scale:4;
454 u_int8_t sc_flags;
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455#define SCF_NOOPT 0x01 /* no TCP options */
456#define SCF_WINSCALE 0x02 /* negotiated window scaling */
457#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
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458#define SCF_UNREACH 0x10 /* icmp unreachable received */
459#define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */
b1992928 460#define SCF_SIGNATURE 0x40 /* send MD5 digests */
c1d0893d 461#define SCF_MARKER 0x80 /* not a real entry */
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462 TAILQ_ENTRY(syncache) sc_hash;
463 TAILQ_ENTRY(syncache) sc_timerq;
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464};
465
466struct syncache_head {
467 TAILQ_HEAD(, syncache) sch_bucket;
468 u_int sch_length;
469};
f23061d4 470
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471#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
472#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
473
474/*
475 * The smoothed round-trip time and estimated variance
476 * are stored as fixed point numbers scaled by the values below.
477 * For convenience, these scales are also used in smoothing the average
478 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
479 * With these scales, srtt has 3 bits to the right of the binary point,
480 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
481 * binary point, and is smoothed with an ALPHA of 0.75.
482 */
483#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
484#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
485#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
486#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
487#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
488
489/*
490 * The initial retransmission should happen at rtt + 4 * rttvar.
491 * Because of the way we do the smoothing, srtt and rttvar
492 * will each average +1/2 tick of bias. When we compute
493 * the retransmit timer, we want 1/2 tick of rounding and
494 * 1 extra tick because of +-1/2 tick uncertainty in the
495 * firing of the timer. The bias will give us exactly the
496 * 1.5 tick we need. But, because the bias is
497 * statistical, we have to test that we don't drop below
498 * the minimum feasible timer (which is 2 ticks).
499 * This version of the macro adapted from a paper by Lawrence
500 * Brakmo and Larry Peterson which outlines a problem caused
501 * by insufficient precision in the original implementation,
502 * which results in inappropriately large RTO values for very
503 * fast networks.
504 */
505#define TCP_REXMTVAL(tp) \
506 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
507 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
508
509/*
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510 * TCB structure exported to user-land via sysctl(3).
511 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
512 * included. Not all of our clients do.
513 */
514#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
515struct xtcpcb {
516 size_t xt_len;
517 struct inpcb xt_inp;
518 struct tcpcb xt_tp;
519 struct xsocket xt_socket;
520 u_quad_t xt_alignment_hack;
521};
522#endif
523
524/*
525 * Names for TCP sysctl objects
526 */
527#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
27b8aee3 528/* 2 was TCPCTL_DO_RFC1644 */
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529#define TCPCTL_MSSDFLT 3 /* MSS default */
530#define TCPCTL_STATS 4 /* statistics (read-only) */
531#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
532#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
533#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
534#define TCPCTL_SENDSPACE 8 /* send buffer space */
535#define TCPCTL_RECVSPACE 9 /* receive buffer space */
536#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
537#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
538#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
539#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
540#define TCPCTL_MAXID 14
541
542#define TCPCTL_NAMES { \
543 { 0, 0 }, \
544 { "rfc1323", CTLTYPE_INT }, \
27b8aee3 545 { "reserved", CTLTYPE_INT}, /* was rfc1644 */ \
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546 { "mssdflt", CTLTYPE_INT }, \
547 { "stats", CTLTYPE_STRUCT }, \
548 { "rttdflt", CTLTYPE_INT }, \
549 { "keepidle", CTLTYPE_INT }, \
550 { "keepintvl", CTLTYPE_INT }, \
551 { "sendspace", CTLTYPE_INT }, \
552 { "recvspace", CTLTYPE_INT }, \
553 { "keepinit", CTLTYPE_INT }, \
554 { "pcblist", CTLTYPE_STRUCT }, \
555 { "delacktime", CTLTYPE_INT }, \
556 { "v6mssdflt", CTLTYPE_INT }, \
557}
558
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559#ifdef _KERNEL
560#ifdef SYSCTL_DECL
561SYSCTL_DECL(_net_inet_tcp);
562#endif
563
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564#define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED)
565
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566TAILQ_HEAD(tcpcbackqhead,tcpcb);
567
d371a63a 568extern struct inpcbinfo tcbinfo[];
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569extern struct tcpcbackqhead tcpcbackq[];
570
984263bc 571extern int tcp_mssdflt; /* XXX */
5b0b9fa5 572extern int tcp_minmss;
984263bc 573extern int tcp_delack_enabled;
984263bc 574extern int path_mtu_discovery;
984263bc 575
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576union netmsg;
577
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578int tcp_addrcpu(in_addr_t faddr, in_port_t fport,
579 in_addr_t laddr, in_port_t lport);
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580struct lwkt_port *
581 tcp_addrport(in_addr_t faddr, in_port_t fport,
582 in_addr_t laddr, in_port_t lport);
65f3e756 583struct lwkt_port *tcp_addrport0(void);
42a7fc75 584void tcp_canceltimers (struct tcpcb *);
984263bc 585struct tcpcb *
42a7fc75 586 tcp_close (struct tcpcb *);
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587void tcp_ctlinput(union netmsg *);
588void tcp_ctloutput(union netmsg *);
984263bc 589struct tcpcb *
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590 tcp_drop (struct tcpcb *, int);
591void tcp_drain (void);
592void tcp_fasttimo (void);
42a7fc75 593void tcp_init (void);
bf82f9b7 594void tcp_thread_init (void);
002c1265 595int tcp_input (struct mbuf **, int *, int);
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596void tcp_mss (struct tcpcb *, int);
597int tcp_mssopt (struct tcpcb *);
598void tcp_drop_syn_sent (struct inpcb *, int);
599void tcp_mtudisc (struct inpcb *, int);
984263bc 600struct tcpcb *
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601 tcp_newtcpcb (struct inpcb *);
602int tcp_output (struct tcpcb *);
603void tcp_quench (struct inpcb *, int);
604void tcp_respond (struct tcpcb *, void *,
605 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
984263bc 606struct rtentry *
42a7fc75 607 tcp_rtlookup (struct in_conninfo *);
9a5b142f 608int tcp_sack_bytes_below(struct scoreboard *scb, tcp_seq seq);
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609void tcp_sack_cleanup(struct scoreboard *scb);
610int tcp_sack_ndsack_blocks(struct raw_sackblock *blocks,
611 const int numblocks, tcp_seq snd_una);
612void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen);
613boolean_t
614 tcp_sack_has_sacked(struct scoreboard *scb, u_int amount);
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615void tcp_sack_tcpcb_init(struct tcpcb *tp);
616uint32_t tcp_sack_compute_pipe(struct tcpcb *tp);
617boolean_t
618 tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len,
619 boolean_t *losdup);
620#ifdef later
621void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una,
622 u_int maxseg);
623void tcp_sack_save_scoreboard(struct scoreboard *scb);
624#endif
625void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt);
626void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to);
efd4b327 627void tcp_save_congestion_state(struct tcpcb *tp);
bfdb979e 628void tcp_revert_congestion_state(struct tcpcb *tp);
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629void tcp_setpersist (struct tcpcb *);
630void tcp_slowtimo (void);
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631struct tcptemp *tcp_maketemplate (struct tcpcb *);
632void tcp_freetemplate (struct tcptemp *);
42a7fc75 633void tcp_fillheaders (struct tcpcb *, void *, void *);
bf82f9b7 634struct lwkt_port *
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635 tcp_soport(struct socket *, struct sockaddr *, struct mbuf **);
636struct lwkt_port *
e3873585 637 tcp_ctlport(int, struct sockaddr *, void *);
984263bc 638struct tcpcb *
42a7fc75 639 tcp_timers (struct tcpcb *, int);
f3f70f0d 640void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *,
42a7fc75 641 int);
984263bc 642void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
0ecd93f9 643void tcp_timer_keep_activity(struct tcpcb *tp, int thflags);
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644void syncache_init(void);
645void syncache_unreach(struct in_conninfo *, struct tcphdr *);
646int syncache_expand(struct in_conninfo *, struct tcphdr *,
647 struct socket **, struct mbuf *);
648int syncache_add(struct in_conninfo *, struct tcpopt *,
649 struct tcphdr *, struct socket **, struct mbuf *);
650void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
651void syncache_badack(struct in_conninfo *);
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652void syncache_destroy(struct tcpcb *tp);
653
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654#ifdef TCP_SIGNATURE
655int tcpsignature_apply(void *fstate, void *data, unsigned int len);
656int tcpsignature_compute(struct mbuf *m, int len, int tcpoptlen,
657 u_char *buf, u_int direction);
658#endif /* TCP_SIGNATURE */
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659
660extern struct pr_usrreqs tcp_usrreqs;
661extern u_long tcp_sendspace;
662extern u_long tcp_recvspace;
42a7fc75 663tcp_seq tcp_new_isn (struct tcpcb *);
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664
665#endif /* _KERNEL */
666
667#endif /* _NETINET_TCP_VAR_H_ */