TCP - Remove net.inet.tcp.minmssoverload
[dragonfly.git] / sys / netinet / tcp_var.h
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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 */
c1d3b892 180 tcp_seq snd_up; /* send urgent pointer */
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181
182 tcp_seq snd_una; /* send unacknowledged */
c1d3b892 183 tcp_seq snd_recover; /* for use with NewReno Fast Recovery */
984263bc 184 tcp_seq snd_max; /* highest sequence number sent;
8acdb67c 185 * used to recognize retransmits */
984263bc 186 tcp_seq snd_nxt; /* send next */
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187
188 tcp_seq snd_wl1; /* window update seg seq number */
189 tcp_seq snd_wl2; /* window update seg ack number */
190 tcp_seq iss; /* initial send sequence number */
191 tcp_seq irs; /* initial receive sequence number */
192
193 tcp_seq rcv_nxt; /* receive next */
194 tcp_seq rcv_adv; /* advertised window */
195 u_long rcv_wnd; /* receive window */
196 tcp_seq rcv_up; /* receive urgent pointer */
197
198 u_long snd_wnd; /* send window */
199 u_long snd_cwnd; /* congestion-controlled window */
8acdb67c 200 u_long snd_wacked; /* bytes acked in one send window */
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201 u_long snd_ssthresh; /* snd_cwnd size threshold for
202 * for slow start exponential to
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203 * linear switch */
204
205 int t_rxtcur; /* current retransmit value (ticks) */
206 u_int t_maxseg; /* maximum segment size */
207 int t_srtt; /* smoothed round-trip time */
208 int t_rttvar; /* variance in round-trip time */
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209
210 u_int t_maxopd; /* mss plus options */
211
212 u_long t_rcvtime; /* inactivity time */
213 u_long t_starttime; /* time connection was established */
214 int t_rtttime; /* round trip time */
215 tcp_seq t_rtseq; /* sequence number being timed */
216
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217 int t_rxtshift; /* log(2) of rexmt exp. backoff */
218 u_int t_rttmin; /* minimum rtt allowed */
219 u_int t_rttbest; /* best rtt we've seen */
220 u_long t_rttupdated; /* number of times rtt sampled */
221 u_long max_sndwnd; /* largest window peer has offered */
222
223 int t_softerror; /* possible error not yet reported */
224/* out-of-band data */
225 char t_oobflags; /* have some */
226 char t_iobc; /* input character */
227#define TCPOOB_HAVEDATA 0x01
228#define TCPOOB_HADDATA 0x02
8acdb67c 229
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230/* RFC 1323 variables */
231 u_char snd_scale; /* window scaling for send window */
232 u_char rcv_scale; /* window scaling for recv window */
233 u_char request_r_scale; /* pending window scaling */
234 u_char requested_s_scale;
235 u_long ts_recent; /* timestamp echo data */
236
237 u_long ts_recent_age; /* when last updated */
238 tcp_seq last_ack_sent;
8acdb67c 239
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240/* RFC 1644 variables */
241 tcp_cc cc_send; /* send connection count */
242 tcp_cc cc_recv; /* receive connection count */
8acdb67c 243
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244/* experimental */
245 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
8acdb67c 246 u_long snd_wacked_prev; /* prior bytes acked in send window */
984263bc 247 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
9845754e 248 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
984263bc 249 u_long t_badrxtwin; /* window for retransmit recovery */
efd4b327 250 u_long t_rexmtTS; /* timestamp of last retransmit */
33abdd1c 251 u_char snd_limited; /* segments limited transmitted */
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252
253 tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */
254 tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */
255 struct scoreboard scb; /* sack scoreboard */
256 struct raw_sackblock reportblk; /* incoming segment or D-SACK block */
257 struct raw_sackblock encloseblk;
258 int nsackhistory;
259 struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */
2b1ce38a 260 TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */
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261
262 /* bandwith limitation */
263 u_long snd_bandwidth; /* calculated bandwidth or 0 */
264 u_long snd_bwnd; /* bandwidth-controlled window */
265 int t_bw_rtttime; /* used for bandwidth calculation */
266 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
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267
268/* anti DoS counters */
269 u_long rcv_second; /* start of interval second */
270 u_long rcv_pps; /* received packets per second */
271 u_long rcv_byps; /* received bytes per second */
272
273 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
274 int rfbuf_cnt; /* recv buffer autoscaling byte count */
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275};
276
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277#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
278#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
279#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
280
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281/*
282 * TCP statistics.
283 */
284struct tcp_stats {
285 u_long tcps_connattempt; /* connections initiated */
286 u_long tcps_accepts; /* connections accepted */
287 u_long tcps_connects; /* connections established */
288 u_long tcps_drops; /* connections dropped */
289 u_long tcps_conndrops; /* embryonic connections dropped */
5b0b9fa5 290 u_long tcps_minmssdrops; /* average minmss too low drops */
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291 u_long tcps_closed; /* conn. closed (includes drops) */
292 u_long tcps_segstimed; /* segs where we tried to get rtt */
293 u_long tcps_rttupdated; /* times we succeeded */
294 u_long tcps_delack; /* delayed acks sent */
295 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
296 u_long tcps_rexmttimeo; /* retransmit timeouts */
297 u_long tcps_persisttimeo; /* persist timeouts */
298 u_long tcps_keeptimeo; /* keepalive timeouts */
299 u_long tcps_keepprobe; /* keepalive probes sent */
300 u_long tcps_keepdrops; /* connections dropped in keepalive */
301
302 u_long tcps_sndtotal; /* total packets sent */
303 u_long tcps_sndpack; /* data packets sent */
304 u_long tcps_sndbyte; /* data bytes sent */
305 u_long tcps_sndrexmitpack; /* data packets retransmitted */
306 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
307 u_long tcps_sndfastrexmit; /* Fast Retransmissions */
308 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */
309 u_long tcps_sndlimited; /* Limited Transmit packets */
310 u_long tcps_sndrtobad; /* spurious RTO retransmissions */
311 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */
312 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions,
313 a subset of tcps_sndfastrexmitbad */
314 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */
315 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */
316 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */
317 u_long tcps_sndacks; /* ack-only packets sent */
318 u_long tcps_sndprobe; /* window probes sent */
319 u_long tcps_sndurg; /* packets sent with URG only */
320 u_long tcps_sndwinup; /* window update-only packets sent */
321 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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322 u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */
323 u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */
324 u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */
325 u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */
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326
327 u_long tcps_rcvtotal; /* total packets received */
328 u_long tcps_rcvpack; /* packets received in sequence */
329 u_long tcps_rcvbyte; /* bytes received in sequence */
330 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
331 u_long tcps_rcvbadoff; /* packets received with bad offset */
332 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
333 u_long tcps_rcvshort; /* packets received too short */
334 u_long tcps_rcvduppack; /* duplicate-only packets received */
335 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
336 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
337 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
338 u_long tcps_rcvoopack; /* out-of-order packets received */
339 u_long tcps_rcvoobyte; /* out-of-order bytes received */
340 u_long tcps_rcvpackafterwin; /* packets with data after window */
341 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
342 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
343 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
344 u_long tcps_rcvdupack; /* rcvd duplicate acks */
345 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
346 u_long tcps_rcvackpack; /* rcvd ack packets */
347 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
348 u_long tcps_rcvwinupd; /* rcvd window update packets */
349 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
350 u_long tcps_predack; /* times hdr predict ok for acks */
351 u_long tcps_preddat; /* times hdr predict ok for data pkts */
352 u_long tcps_pcbcachemiss;
353 u_long tcps_cachedrtt; /* times cached RTT in route updated */
354 u_long tcps_cachedrttvar; /* times cached rttvar updated */
355 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
356 u_long tcps_usedrtt; /* times RTT initialized from route */
357 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
358 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
359 u_long tcps_persistdrop; /* timeout in persist state */
360 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
361 u_long tcps_mturesent; /* resends due to MTU discovery */
362 u_long tcps_listendrop; /* listen queue overflows */
363
364 u_long tcps_sc_added; /* entry added to syncache */
365 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
366 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
367 u_long tcps_sc_dropped; /* could not reply to packet */
368 u_long tcps_sc_completed; /* successful extraction of entry */
369 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
370 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
371 u_long tcps_sc_reset; /* RST removed entry from syncache */
372 u_long tcps_sc_stale; /* timed out or listen socket gone */
373 u_long tcps_sc_aborted; /* syncache entry aborted */
374 u_long tcps_sc_badack; /* removed due to bad ACK */
375 u_long tcps_sc_unreach; /* ICMP unreachable received */
376 u_long tcps_sc_zonefail; /* zalloc() failed */
377 u_long tcps_sc_sendcookie; /* SYN cookie sent */
378 u_long tcps_sc_recvcookie; /* SYN cookie received */
379};
380
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381#ifdef _KERNEL
382
383#if defined(SMP)
384#define tcpstat tcpstats_percpu[mycpuid]
385#else
386#define tcpstat tcpstats_percpu[0]
387#endif
388
389struct sockopt;
390
391extern struct tcp_stats tcpstats_percpu[MAXCPU];
392
393static const int tcprexmtthresh = 3;
394#endif
395
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396/*
397 * Structure to hold TCP options that are only used during segment
398 * processing (in tcp_input), but not held in the tcpcb.
399 * It's basically used to reduce the number of parameters
400 * to tcp_dooptions.
401 */
402struct tcpopt {
403 u_long to_flags; /* which options are present */
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404#define TOF_TS 0x0001 /* timestamp */
405#define TOF_CC 0x0002 /* CC and CCnew are exclusive */
406#define TOF_CCNEW 0x0004
407#define TOF_CCECHO 0x0008
408#define TOF_MSS 0x0010
409#define TOF_SCALE 0x0020
410#define TOF_SACK_PERMITTED 0x0040
411#define TOF_SACK 0x0080
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412 u_int32_t to_tsval;
413 u_int32_t to_tsecr;
414 tcp_cc to_cc; /* holds CC or CCnew */
415 tcp_cc to_ccecho;
416 u_int16_t to_mss;
f23061d4 417 u_int8_t to_requested_s_scale;
16fb1aa4 418 u_int8_t to_nsackblocks;
91489f6b 419 struct raw_sackblock *to_sackblocks;
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420};
421
422struct syncache {
423 inp_gen_t sc_inp_gencnt; /* pointer check */
f23061d4 424 struct tcpcb *sc_tp; /* tcb for listening socket */
984263bc 425 struct mbuf *sc_ipopts; /* source route */
f23061d4 426 struct in_conninfo sc_inc; /* addresses */
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427#define sc_route sc_inc.inc_route
428#define sc_route6 sc_inc.inc6_route
429 u_int32_t sc_tsrecent;
430 tcp_cc sc_cc_send; /* holds CC or CCnew */
431 tcp_cc sc_cc_recv;
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432 tcp_seq sc_irs; /* seq from peer */
433 tcp_seq sc_iss; /* our ISS */
984263bc 434 u_long sc_rxttime; /* retransmit time */
f23061d4 435 u_int16_t sc_rxtslot; /* retransmit counter */
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436 u_int16_t sc_peer_mss; /* peer's MSS */
437 u_int16_t sc_wnd; /* advertised window */
f23061d4 438 u_int8_t sc_requested_s_scale:4,
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439 sc_request_r_scale:4;
440 u_int8_t sc_flags;
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441#define SCF_NOOPT 0x01 /* no TCP options */
442#define SCF_WINSCALE 0x02 /* negotiated window scaling */
443#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
444#define SCF_CC 0x08 /* negotiated CC */
445#define SCF_UNREACH 0x10 /* icmp unreachable received */
446#define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */
447 TAILQ_ENTRY(syncache) sc_hash;
448 TAILQ_ENTRY(syncache) sc_timerq;
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449};
450
451struct syncache_head {
452 TAILQ_HEAD(, syncache) sch_bucket;
453 u_int sch_length;
454};
f23061d4 455
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456/*
457 * The TAO cache entry which is stored in the protocol family specific
458 * portion of the route metrics.
459 */
460struct rmxp_tao {
461 tcp_cc tao_cc; /* latest CC in valid SYN */
462 tcp_cc tao_ccsent; /* latest CC sent to peer */
463 u_short tao_mssopt; /* peer's cached MSS */
f23061d4 464
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465#ifdef notyet
466 u_short tao_flags; /* cache status flags */
467#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */
468#define TAOF_OK 0x0002 /* peer does understand rfc1644 */
469#define TAOF_UNDEF 0 /* we don't know yet */
f23061d4 470#endif
984263bc 471};
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472
473#define rmx_taop(rt) ((struct rmxp_tao *)(rt).rmx_filler)
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474
475#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
476#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
477
478/*
479 * The smoothed round-trip time and estimated variance
480 * are stored as fixed point numbers scaled by the values below.
481 * For convenience, these scales are also used in smoothing the average
482 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
483 * With these scales, srtt has 3 bits to the right of the binary point,
484 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
485 * binary point, and is smoothed with an ALPHA of 0.75.
486 */
487#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
488#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
489#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
490#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
491#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
492
493/*
494 * The initial retransmission should happen at rtt + 4 * rttvar.
495 * Because of the way we do the smoothing, srtt and rttvar
496 * will each average +1/2 tick of bias. When we compute
497 * the retransmit timer, we want 1/2 tick of rounding and
498 * 1 extra tick because of +-1/2 tick uncertainty in the
499 * firing of the timer. The bias will give us exactly the
500 * 1.5 tick we need. But, because the bias is
501 * statistical, we have to test that we don't drop below
502 * the minimum feasible timer (which is 2 ticks).
503 * This version of the macro adapted from a paper by Lawrence
504 * Brakmo and Larry Peterson which outlines a problem caused
505 * by insufficient precision in the original implementation,
506 * which results in inappropriately large RTO values for very
507 * fast networks.
508 */
509#define TCP_REXMTVAL(tp) \
510 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
511 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
512
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513/*
514 * TCB structure exported to user-land via sysctl(3).
515 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
516 * included. Not all of our clients do.
517 */
518#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
519struct xtcpcb {
520 size_t xt_len;
521 struct inpcb xt_inp;
522 struct tcpcb xt_tp;
523 struct xsocket xt_socket;
524 u_quad_t xt_alignment_hack;
525};
526#endif
527
528/*
529 * Names for TCP sysctl objects
530 */
531#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
532#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */
533#define TCPCTL_MSSDFLT 3 /* MSS default */
534#define TCPCTL_STATS 4 /* statistics (read-only) */
535#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
536#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
537#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
538#define TCPCTL_SENDSPACE 8 /* send buffer space */
539#define TCPCTL_RECVSPACE 9 /* receive buffer space */
540#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
541#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
542#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
543#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
544#define TCPCTL_MAXID 14
545
546#define TCPCTL_NAMES { \
547 { 0, 0 }, \
548 { "rfc1323", CTLTYPE_INT }, \
549 { "rfc1644", CTLTYPE_INT }, \
550 { "mssdflt", CTLTYPE_INT }, \
551 { "stats", CTLTYPE_STRUCT }, \
552 { "rttdflt", CTLTYPE_INT }, \
553 { "keepidle", CTLTYPE_INT }, \
554 { "keepintvl", CTLTYPE_INT }, \
555 { "sendspace", CTLTYPE_INT }, \
556 { "recvspace", CTLTYPE_INT }, \
557 { "keepinit", CTLTYPE_INT }, \
558 { "pcblist", CTLTYPE_STRUCT }, \
559 { "delacktime", CTLTYPE_INT }, \
560 { "v6mssdflt", CTLTYPE_INT }, \
561}
562
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563#ifdef _KERNEL
564#ifdef SYSCTL_DECL
565SYSCTL_DECL(_net_inet_tcp);
566#endif
567
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568#define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED)
569
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570TAILQ_HEAD(tcpcbackqhead,tcpcb);
571
d371a63a 572extern struct inpcbinfo tcbinfo[];
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573extern struct tcpcbackqhead tcpcbackq[];
574
984263bc 575extern int tcp_mssdflt; /* XXX */
5b0b9fa5 576extern int tcp_minmss;
984263bc 577extern int tcp_delack_enabled;
984263bc 578extern int path_mtu_discovery;
984263bc 579
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580int tcp_addrcpu(in_addr_t faddr, in_port_t fport,
581 in_addr_t laddr, in_port_t lport);
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582struct lwkt_port *
583 tcp_addrport(in_addr_t faddr, in_port_t fport,
584 in_addr_t laddr, in_port_t lport);
42a7fc75 585void tcp_canceltimers (struct tcpcb *);
984263bc 586struct tcpcb *
42a7fc75 587 tcp_close (struct tcpcb *);
2b1ce38a 588void tcpmsg_service_loop (void *);
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589void tcp_ctlinput (int, struct sockaddr *, void *);
590int tcp_ctloutput (struct socket *, struct sockopt *);
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591struct lwkt_port *
592 tcp_cport(int cpu);
984263bc 593struct tcpcb *
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594 tcp_drop (struct tcpcb *, int);
595void tcp_drain (void);
596void tcp_fasttimo (void);
984263bc 597struct rmxp_tao *
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598 tcp_gettaocache (struct in_conninfo *);
599void tcp_init (void);
bf82f9b7 600void tcp_thread_init (void);
a00138cb 601void tcp_input (struct mbuf *, ...);
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602void tcp_mss (struct tcpcb *, int);
603int tcp_mssopt (struct tcpcb *);
604void tcp_drop_syn_sent (struct inpcb *, int);
605void tcp_mtudisc (struct inpcb *, int);
984263bc 606struct tcpcb *
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607 tcp_newtcpcb (struct inpcb *);
608int tcp_output (struct tcpcb *);
609void tcp_quench (struct inpcb *, int);
610void tcp_respond (struct tcpcb *, void *,
611 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
984263bc 612struct rtentry *
42a7fc75 613 tcp_rtlookup (struct in_conninfo *);
9a5b142f 614int tcp_sack_bytes_below(struct scoreboard *scb, tcp_seq seq);
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615void tcp_sack_cleanup(struct scoreboard *scb);
616int tcp_sack_ndsack_blocks(struct raw_sackblock *blocks,
617 const int numblocks, tcp_seq snd_una);
618void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen);
619boolean_t
620 tcp_sack_has_sacked(struct scoreboard *scb, u_int amount);
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621void tcp_sack_tcpcb_init(struct tcpcb *tp);
622uint32_t tcp_sack_compute_pipe(struct tcpcb *tp);
623boolean_t
624 tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len,
625 boolean_t *losdup);
626#ifdef later
627void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una,
628 u_int maxseg);
629void tcp_sack_save_scoreboard(struct scoreboard *scb);
630#endif
631void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt);
632void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to);
efd4b327 633void tcp_save_congestion_state(struct tcpcb *tp);
bfdb979e 634void tcp_revert_congestion_state(struct tcpcb *tp);
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635void tcp_setpersist (struct tcpcb *);
636void tcp_slowtimo (void);
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637struct tcptemp *tcp_maketemplate (struct tcpcb *);
638void tcp_freetemplate (struct tcptemp *);
42a7fc75 639void tcp_fillheaders (struct tcpcb *, void *, void *);
bf82f9b7 640struct lwkt_port *
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641 tcp_soport(struct socket *, struct sockaddr *,
642 struct mbuf **, int);
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643struct lwkt_port *
644 tcp_ctlport(int, struct sockaddr *, void *);
984263bc 645struct tcpcb *
42a7fc75 646 tcp_timers (struct tcpcb *, int);
f3f70f0d 647void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *,
42a7fc75 648 int);
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649void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
650void syncache_init(void);
651void syncache_unreach(struct in_conninfo *, struct tcphdr *);
652int syncache_expand(struct in_conninfo *, struct tcphdr *,
653 struct socket **, struct mbuf *);
654int syncache_add(struct in_conninfo *, struct tcpopt *,
655 struct tcphdr *, struct socket **, struct mbuf *);
656void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
657void syncache_badack(struct in_conninfo *);
658
659extern struct pr_usrreqs tcp_usrreqs;
660extern u_long tcp_sendspace;
661extern u_long tcp_recvspace;
42a7fc75 662tcp_seq tcp_new_isn (struct tcpcb *);
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663
664#endif /* _KERNEL */
665
666#endif /* _NETINET_TCP_VAR_H_ */