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984263bc | 1 | /* |
66d6c637 JH |
2 | * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. |
3 | * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. | |
f23061d4 | 4 | * |
66d6c637 JH |
5 | * This code is derived from software contributed to The DragonFly Project |
6 | * by Jeffrey M. Hsu. | |
f23061d4 | 7 | * |
66d6c637 JH |
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 | * |
66d6c637 JH |
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 | /* |
984263bc MD |
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 $ |
984263bc MD |
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 */ |
1bd40720 MD |
76 | #endif |
77 | #ifndef _NETINET_TCP_H_ | |
78 | #include <netinet/tcp.h> | |
79 | #endif | |
984263bc MD |
80 | |
81 | /* | |
82 | * Kernel variables for tcp. | |
83 | */ | |
8acdb67c | 84 | extern int tcp_do_rfc1323; |
8acdb67c | 85 | extern int tcp_do_rfc3390; |
48a4676d | 86 | extern int tcp_low_rtobase; |
8acdb67c JH |
87 | extern int tcp_do_sack; |
88 | extern int tcp_do_smartsack; | |
89 | extern int tcp_aggregate_acks; | |
984263bc MD |
90 | |
91 | /* TCP segment queue entry */ | |
92 | struct 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 | }; | |
98 | LIST_HEAD(tsegqe_head, tseg_qent); | |
3edf7c37 RG |
99 | extern int tcp_reass_maxseg; |
100 | extern int tcp_reass_qsize; | |
984263bc MD |
101 | #ifdef MALLOC_DECLARE |
102 | MALLOC_DECLARE(M_TSEGQ); | |
103 | #endif | |
104 | ||
105 | struct 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 | ||
91489f6b JH |
112 | struct 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 | ||
120 | TAILQ_HEAD(sackblock_list, sackblock); | |
121 | ||
122 | struct 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 | ||
0f758523 SZ |
129 | struct netmsg_tcp_timer; |
130 | ||
984263bc MD |
131 | /* |
132 | * Tcp control block, one per tcp; fields: | |
133 | * Organized for 16 byte cacheline efficiency. | |
134 | */ | |
135 | struct 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 | |
a48c5dd5 SZ |
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 */ |
984263bc MD |
146 | |
147 | struct inpcb *t_inpcb; /* back pointer to internet pcb */ | |
148 | int t_state; /* state of this connection */ | |
149 | u_int t_flags; | |
8819433a JH |
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 */ |
8819433a JH |
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 */ | |
f7b29de5 | 163 | #define TF_LISTEN 0x00002000 /* listen(2) has been called */ |
2a0c7c52 MD |
164 | #define TF_SIGNATURE 0x00004000 /* require MD5 digests (RFC2385) */ |
165 | #define TF_FASTKEEP 0x00008000 /* use a faster tcp_keepidle */ | |
8819433a | 166 | #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */ |
be34e534 | 167 | #define TF_SYN_WASLOST 0x00020000 /* SYN or SYN|ACK was lost */ |
8819433a JH |
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 */ |
91489f6b JH |
177 | #define TF_DUPSEG 0x08000000 /* last seg a duplicate */ |
178 | #define TF_ENCLOSESEG 0x10000000 /* enclosing SACK block */ | |
179 | #define TF_SACKLEFT 0x20000000 /* send SACK blocks from left side */ | |
efca2b8e | 180 | #define TF_KEEPALIVE 0x40000000 /* temporary keepalive */ |
46e92930 | 181 | #define TF_RXRESIZED 0x80000000 /* rcvbuf was resized */ |
c1d3b892 | 182 | tcp_seq snd_up; /* send urgent pointer */ |
984263bc MD |
183 | |
184 | tcp_seq snd_una; /* send unacknowledged */ | |
c1d3b892 | 185 | tcp_seq snd_recover; /* for use with NewReno Fast Recovery */ |
984263bc | 186 | tcp_seq snd_max; /* highest sequence number sent; |
8acdb67c | 187 | * used to recognize retransmits */ |
984263bc | 188 | tcp_seq snd_nxt; /* send next */ |
984263bc MD |
189 | |
190 | tcp_seq snd_wl1; /* window update seg seq number */ | |
191 | tcp_seq snd_wl2; /* window update seg ack number */ | |
192 | tcp_seq iss; /* initial send sequence number */ | |
193 | tcp_seq irs; /* initial receive sequence number */ | |
194 | ||
195 | tcp_seq rcv_nxt; /* receive next */ | |
196 | tcp_seq rcv_adv; /* advertised window */ | |
197 | u_long rcv_wnd; /* receive window */ | |
198 | tcp_seq rcv_up; /* receive urgent pointer */ | |
199 | ||
200 | u_long snd_wnd; /* send window */ | |
201 | u_long snd_cwnd; /* congestion-controlled window */ | |
8acdb67c | 202 | u_long snd_wacked; /* bytes acked in one send window */ |
984263bc MD |
203 | u_long snd_ssthresh; /* snd_cwnd size threshold for |
204 | * for slow start exponential to | |
8acdb67c JH |
205 | * linear switch */ |
206 | ||
207 | int t_rxtcur; /* current retransmit value (ticks) */ | |
208 | u_int t_maxseg; /* maximum segment size */ | |
209 | int t_srtt; /* smoothed round-trip time */ | |
210 | int t_rttvar; /* variance in round-trip time */ | |
984263bc MD |
211 | |
212 | u_int t_maxopd; /* mss plus options */ | |
213 | ||
214 | u_long t_rcvtime; /* inactivity time */ | |
215 | u_long t_starttime; /* time connection was established */ | |
216 | int t_rtttime; /* round trip time */ | |
217 | tcp_seq t_rtseq; /* sequence number being timed */ | |
218 | ||
984263bc MD |
219 | int t_rxtshift; /* log(2) of rexmt exp. backoff */ |
220 | u_int t_rttmin; /* minimum rtt allowed */ | |
221 | u_int t_rttbest; /* best rtt we've seen */ | |
222 | u_long t_rttupdated; /* number of times rtt sampled */ | |
223 | u_long max_sndwnd; /* largest window peer has offered */ | |
224 | ||
225 | int t_softerror; /* possible error not yet reported */ | |
226 | /* out-of-band data */ | |
227 | char t_oobflags; /* have some */ | |
228 | char t_iobc; /* input character */ | |
229 | #define TCPOOB_HAVEDATA 0x01 | |
230 | #define TCPOOB_HADDATA 0x02 | |
8acdb67c | 231 | |
984263bc MD |
232 | /* RFC 1323 variables */ |
233 | u_char snd_scale; /* window scaling for send window */ | |
234 | u_char rcv_scale; /* window scaling for recv window */ | |
235 | u_char request_r_scale; /* pending window scaling */ | |
236 | u_char requested_s_scale; | |
237 | u_long ts_recent; /* timestamp echo data */ | |
238 | ||
239 | u_long ts_recent_age; /* when last updated */ | |
240 | tcp_seq last_ack_sent; | |
8acdb67c | 241 | |
984263bc MD |
242 | /* experimental */ |
243 | u_long snd_cwnd_prev; /* cwnd prior to retransmit */ | |
8acdb67c | 244 | u_long snd_wacked_prev; /* prior bytes acked in send window */ |
984263bc | 245 | u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ |
9845754e | 246 | tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ |
984263bc | 247 | u_long t_badrxtwin; /* window for retransmit recovery */ |
efd4b327 | 248 | u_long t_rexmtTS; /* timestamp of last retransmit */ |
33abdd1c | 249 | u_char snd_limited; /* segments limited transmitted */ |
91489f6b JH |
250 | |
251 | tcp_seq rexmt_high; /* highest seq # retransmitted + 1 */ | |
252 | tcp_seq snd_max_rexmt; /* snd_max when rexmting snd_una */ | |
253 | struct scoreboard scb; /* sack scoreboard */ | |
254 | struct raw_sackblock reportblk; /* incoming segment or D-SACK block */ | |
255 | struct raw_sackblock encloseblk; | |
256 | int nsackhistory; | |
257 | struct raw_sackblock sackhistory[MAX_SACK_REPORT_BLOCKS]; /* reported */ | |
2b1ce38a | 258 | TAILQ_ENTRY(tcpcb) t_outputq; /* tcp_output needed list */ |
8acdb67c JH |
259 | |
260 | /* bandwith limitation */ | |
261 | u_long snd_bandwidth; /* calculated bandwidth or 0 */ | |
262 | u_long snd_bwnd; /* bandwidth-controlled window */ | |
263 | int t_bw_rtttime; /* used for bandwidth calculation */ | |
264 | tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ | |
5b0b9fa5 PA |
265 | |
266 | /* anti DoS counters */ | |
267 | u_long rcv_second; /* start of interval second */ | |
268 | u_long rcv_pps; /* received packets per second */ | |
269 | u_long rcv_byps; /* received bytes per second */ | |
270 | ||
271 | u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ | |
272 | int rfbuf_cnt; /* recv buffer autoscaling byte count */ | |
2ce132be | 273 | |
340ba84c | 274 | int t_keepinit; /* time to establish connection */ |
7ea3a353 | 275 | |
340ba84c SZ |
276 | int t_keepidle; /* time before keepalive probes begin */ |
277 | int t_keepintvl; /* time between keepalive probes */ | |
278 | int t_keepcnt; /* maximum number of keepalive probes */ | |
279 | int t_maxidle; /* time to drop after starting probes */ | |
984263bc MD |
280 | }; |
281 | ||
9845754e MD |
282 | #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) |
283 | #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY | |
284 | #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY | |
285 | ||
b1992928 MD |
286 | #ifdef TCP_SIGNATURE |
287 | /* | |
288 | * Defines which are needed by the xform_tcp module and tcp_[in|out]put | |
289 | * for SADB verification and lookup. | |
290 | */ | |
291 | #define TCP_SIGLEN 16 /* length of computed digest in bytes */ | |
292 | #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ | |
293 | #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ | |
294 | /* | |
295 | * Only a single SA per host may be specified at this time. An SPI is | |
296 | * needed in order for the KEY_ALLOCSA() lookup to work. | |
297 | */ | |
298 | #define TCP_SIG_SPI 0x1000 | |
299 | #endif /* TCP_SIGNATURE */ | |
300 | ||
49309f25 HP |
301 | /* |
302 | * TCP statistics. | |
303 | */ | |
304 | struct tcp_stats { | |
305 | u_long tcps_connattempt; /* connections initiated */ | |
306 | u_long tcps_accepts; /* connections accepted */ | |
307 | u_long tcps_connects; /* connections established */ | |
308 | u_long tcps_drops; /* connections dropped */ | |
309 | u_long tcps_conndrops; /* embryonic connections dropped */ | |
5b0b9fa5 | 310 | u_long tcps_minmssdrops; /* average minmss too low drops */ |
49309f25 HP |
311 | u_long tcps_closed; /* conn. closed (includes drops) */ |
312 | u_long tcps_segstimed; /* segs where we tried to get rtt */ | |
313 | u_long tcps_rttupdated; /* times we succeeded */ | |
314 | u_long tcps_delack; /* delayed acks sent */ | |
315 | u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ | |
316 | u_long tcps_rexmttimeo; /* retransmit timeouts */ | |
317 | u_long tcps_persisttimeo; /* persist timeouts */ | |
318 | u_long tcps_keeptimeo; /* keepalive timeouts */ | |
319 | u_long tcps_keepprobe; /* keepalive probes sent */ | |
320 | u_long tcps_keepdrops; /* connections dropped in keepalive */ | |
321 | ||
322 | u_long tcps_sndtotal; /* total packets sent */ | |
323 | u_long tcps_sndpack; /* data packets sent */ | |
324 | u_long tcps_sndbyte; /* data bytes sent */ | |
325 | u_long tcps_sndrexmitpack; /* data packets retransmitted */ | |
326 | u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ | |
02cc2f35 SZ |
327 | u_long tcps_sndsackrtopack; /* packets sent by SACK after RTO */ |
328 | u_long tcps_sndsackrtobyte; /* bytes sent by SACK after RTO */ | |
49309f25 HP |
329 | u_long tcps_sndfastrexmit; /* Fast Retransmissions */ |
330 | u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */ | |
331 | u_long tcps_sndlimited; /* Limited Transmit packets */ | |
332 | u_long tcps_sndrtobad; /* spurious RTO retransmissions */ | |
333 | u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */ | |
334 | u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions, | |
335 | a subset of tcps_sndfastrexmitbad */ | |
336 | u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */ | |
337 | u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */ | |
338 | u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */ | |
339 | u_long tcps_sndacks; /* ack-only packets sent */ | |
340 | u_long tcps_sndprobe; /* window probes sent */ | |
341 | u_long tcps_sndurg; /* packets sent with URG only */ | |
342 | u_long tcps_sndwinup; /* window update-only packets sent */ | |
343 | u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ | |
91489f6b JH |
344 | u_long tcps_sndsackpack; /* packets sent by SACK recovery alg */ |
345 | u_long tcps_sndsackbyte; /* bytes sent by SACK recovery */ | |
346 | u_long tcps_snduna3; /* re-retransmit snd_una on 3 new seg */ | |
347 | u_long tcps_snduna1; /* re-retransmit snd_una on 1 new seg */ | |
02cc2f35 SZ |
348 | u_long tcps_sndsackopt; /* SACK options sent */ |
349 | u_long tcps_snddsackopt; /* D-SACK options sent */ | |
49309f25 HP |
350 | |
351 | u_long tcps_rcvtotal; /* total packets received */ | |
352 | u_long tcps_rcvpack; /* packets received in sequence */ | |
353 | u_long tcps_rcvbyte; /* bytes received in sequence */ | |
354 | u_long tcps_rcvbadsum; /* packets received with ccksum errs */ | |
355 | u_long tcps_rcvbadoff; /* packets received with bad offset */ | |
356 | u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ | |
357 | u_long tcps_rcvshort; /* packets received too short */ | |
358 | u_long tcps_rcvduppack; /* duplicate-only packets received */ | |
359 | u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ | |
360 | u_long tcps_rcvpartduppack; /* packets with some duplicate data */ | |
361 | u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ | |
362 | u_long tcps_rcvoopack; /* out-of-order packets received */ | |
363 | u_long tcps_rcvoobyte; /* out-of-order bytes received */ | |
364 | u_long tcps_rcvpackafterwin; /* packets with data after window */ | |
365 | u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ | |
366 | u_long tcps_rcvafterclose; /* packets rcvd after "close" */ | |
367 | u_long tcps_rcvwinprobe; /* rcvd window probe packets */ | |
368 | u_long tcps_rcvdupack; /* rcvd duplicate acks */ | |
369 | u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ | |
370 | u_long tcps_rcvackpack; /* rcvd ack packets */ | |
371 | u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ | |
372 | u_long tcps_rcvwinupd; /* rcvd window update packets */ | |
373 | u_long tcps_pawsdrop; /* segments dropped due to PAWS */ | |
374 | u_long tcps_predack; /* times hdr predict ok for acks */ | |
375 | u_long tcps_preddat; /* times hdr predict ok for data pkts */ | |
376 | u_long tcps_pcbcachemiss; | |
377 | u_long tcps_cachedrtt; /* times cached RTT in route updated */ | |
378 | u_long tcps_cachedrttvar; /* times cached rttvar updated */ | |
379 | u_long tcps_cachedssthresh; /* times cached ssthresh updated */ | |
380 | u_long tcps_usedrtt; /* times RTT initialized from route */ | |
381 | u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ | |
382 | u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ | |
383 | u_long tcps_persistdrop; /* timeout in persist state */ | |
384 | u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ | |
385 | u_long tcps_mturesent; /* resends due to MTU discovery */ | |
386 | u_long tcps_listendrop; /* listen queue overflows */ | |
02cc2f35 SZ |
387 | u_long tcps_rcvbadsackopt; /* rcvd illegal SACK options */ |
388 | ||
389 | u_long tcps_sacksbupdate; /* times SACK scoreboard updated */ | |
390 | u_long tcps_sacksboverflow; /* times SACK scoreboard overflowed */ | |
391 | u_long tcps_sacksbreused; /* times SACK sb-block reused */ | |
392 | u_long tcps_sacksbfailed; /* times SACK sb update failed */ | |
49309f25 HP |
393 | |
394 | u_long tcps_sc_added; /* entry added to syncache */ | |
395 | u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ | |
396 | u_long tcps_sc_dupsyn; /* duplicate SYN packet */ | |
397 | u_long tcps_sc_dropped; /* could not reply to packet */ | |
398 | u_long tcps_sc_completed; /* successful extraction of entry */ | |
399 | u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ | |
400 | u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ | |
401 | u_long tcps_sc_reset; /* RST removed entry from syncache */ | |
402 | u_long tcps_sc_stale; /* timed out or listen socket gone */ | |
403 | u_long tcps_sc_aborted; /* syncache entry aborted */ | |
404 | u_long tcps_sc_badack; /* removed due to bad ACK */ | |
405 | u_long tcps_sc_unreach; /* ICMP unreachable received */ | |
406 | u_long tcps_sc_zonefail; /* zalloc() failed */ | |
407 | u_long tcps_sc_sendcookie; /* SYN cookie sent */ | |
408 | u_long tcps_sc_recvcookie; /* SYN cookie received */ | |
409 | }; | |
410 | ||
70068ffd SW |
411 | #ifdef _KERNEL |
412 | ||
413 | #if defined(SMP) | |
414 | #define tcpstat tcpstats_percpu[mycpuid] | |
415 | #else | |
416 | #define tcpstat tcpstats_percpu[0] | |
417 | #endif | |
418 | ||
419 | struct sockopt; | |
420 | ||
421 | extern struct tcp_stats tcpstats_percpu[MAXCPU]; | |
422 | ||
423 | static const int tcprexmtthresh = 3; | |
424 | #endif | |
425 | ||
984263bc MD |
426 | /* |
427 | * Structure to hold TCP options that are only used during segment | |
428 | * processing (in tcp_input), but not held in the tcpcb. | |
429 | * It's basically used to reduce the number of parameters | |
430 | * to tcp_dooptions. | |
431 | */ | |
432 | struct tcpopt { | |
433 | u_long to_flags; /* which options are present */ | |
91489f6b | 434 | #define TOF_TS 0x0001 /* timestamp */ |
91489f6b JH |
435 | #define TOF_MSS 0x0010 |
436 | #define TOF_SCALE 0x0020 | |
437 | #define TOF_SACK_PERMITTED 0x0040 | |
438 | #define TOF_SACK 0x0080 | |
b1992928 MD |
439 | #define TOF_SIGNATURE 0x0100 /* signature option present */ |
440 | #define TOF_SIGLEN 0x0200 /* sigature length valid (RFC2385) */ | |
984263bc MD |
441 | u_int32_t to_tsval; |
442 | u_int32_t to_tsecr; | |
984263bc | 443 | u_int16_t to_mss; |
f23061d4 | 444 | u_int8_t to_requested_s_scale; |
16fb1aa4 | 445 | u_int8_t to_nsackblocks; |
91489f6b | 446 | struct raw_sackblock *to_sackblocks; |
984263bc MD |
447 | }; |
448 | ||
449 | struct syncache { | |
450 | inp_gen_t sc_inp_gencnt; /* pointer check */ | |
f23061d4 | 451 | struct tcpcb *sc_tp; /* tcb for listening socket */ |
984263bc | 452 | struct mbuf *sc_ipopts; /* source route */ |
f23061d4 | 453 | struct in_conninfo sc_inc; /* addresses */ |
984263bc MD |
454 | #define sc_route sc_inc.inc_route |
455 | #define sc_route6 sc_inc.inc6_route | |
456 | u_int32_t sc_tsrecent; | |
f23061d4 JH |
457 | tcp_seq sc_irs; /* seq from peer */ |
458 | tcp_seq sc_iss; /* our ISS */ | |
984263bc | 459 | u_long sc_rxttime; /* retransmit time */ |
f23061d4 | 460 | u_int16_t sc_rxtslot; /* retransmit counter */ |
984263bc MD |
461 | u_int16_t sc_peer_mss; /* peer's MSS */ |
462 | u_int16_t sc_wnd; /* advertised window */ | |
f23061d4 | 463 | u_int8_t sc_requested_s_scale:4, |
984263bc MD |
464 | sc_request_r_scale:4; |
465 | u_int8_t sc_flags; | |
a5263048 JH |
466 | #define SCF_NOOPT 0x01 /* no TCP options */ |
467 | #define SCF_WINSCALE 0x02 /* negotiated window scaling */ | |
468 | #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ | |
be34e534 | 469 | #define SCF_SYN_WASLOST 0x08 /* SYN|ACK was lost */ |
a5263048 JH |
470 | #define SCF_UNREACH 0x10 /* icmp unreachable received */ |
471 | #define SCF_SACK_PERMITTED 0x20 /* saw SACK permitted option */ | |
be34e534 | 472 | #define SCF_SIGNATURE 0x40 /* send MD5 digests */ |
c1d0893d | 473 | #define SCF_MARKER 0x80 /* not a real entry */ |
a5263048 JH |
474 | TAILQ_ENTRY(syncache) sc_hash; |
475 | TAILQ_ENTRY(syncache) sc_timerq; | |
984263bc MD |
476 | }; |
477 | ||
478 | struct syncache_head { | |
479 | TAILQ_HEAD(, syncache) sch_bucket; | |
480 | u_int sch_length; | |
481 | }; | |
f23061d4 | 482 | |
984263bc MD |
483 | #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) |
484 | #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) | |
485 | ||
486 | /* | |
487 | * The smoothed round-trip time and estimated variance | |
488 | * are stored as fixed point numbers scaled by the values below. | |
489 | * For convenience, these scales are also used in smoothing the average | |
490 | * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). | |
491 | * With these scales, srtt has 3 bits to the right of the binary point, | |
492 | * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the | |
493 | * binary point, and is smoothed with an ALPHA of 0.75. | |
494 | */ | |
495 | #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ | |
496 | #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ | |
497 | #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ | |
498 | #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ | |
499 | #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ | |
500 | ||
501 | /* | |
502 | * The initial retransmission should happen at rtt + 4 * rttvar. | |
503 | * Because of the way we do the smoothing, srtt and rttvar | |
504 | * will each average +1/2 tick of bias. When we compute | |
505 | * the retransmit timer, we want 1/2 tick of rounding and | |
506 | * 1 extra tick because of +-1/2 tick uncertainty in the | |
507 | * firing of the timer. The bias will give us exactly the | |
508 | * 1.5 tick we need. But, because the bias is | |
509 | * statistical, we have to test that we don't drop below | |
510 | * the minimum feasible timer (which is 2 ticks). | |
511 | * This version of the macro adapted from a paper by Lawrence | |
512 | * Brakmo and Larry Peterson which outlines a problem caused | |
513 | * by insufficient precision in the original implementation, | |
514 | * which results in inappropriately large RTO values for very | |
515 | * fast networks. | |
516 | */ | |
517 | #define TCP_REXMTVAL(tp) \ | |
518 | max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ | |
519 | + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) | |
520 | ||
984263bc MD |
521 | /* |
522 | * TCB structure exported to user-land via sysctl(3). | |
523 | * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been | |
524 | * included. Not all of our clients do. | |
525 | */ | |
526 | #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) | |
527 | struct xtcpcb { | |
528 | size_t xt_len; | |
529 | struct inpcb xt_inp; | |
530 | struct tcpcb xt_tp; | |
531 | struct xsocket xt_socket; | |
532 | u_quad_t xt_alignment_hack; | |
533 | }; | |
534 | #endif | |
535 | ||
536 | /* | |
537 | * Names for TCP sysctl objects | |
538 | */ | |
539 | #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ | |
27b8aee3 | 540 | /* 2 was TCPCTL_DO_RFC1644 */ |
984263bc MD |
541 | #define TCPCTL_MSSDFLT 3 /* MSS default */ |
542 | #define TCPCTL_STATS 4 /* statistics (read-only) */ | |
543 | #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ | |
544 | #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ | |
545 | #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ | |
546 | #define TCPCTL_SENDSPACE 8 /* send buffer space */ | |
547 | #define TCPCTL_RECVSPACE 9 /* receive buffer space */ | |
548 | #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ | |
549 | #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ | |
550 | #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ | |
551 | #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ | |
552 | #define TCPCTL_MAXID 14 | |
553 | ||
554 | #define TCPCTL_NAMES { \ | |
555 | { 0, 0 }, \ | |
556 | { "rfc1323", CTLTYPE_INT }, \ | |
27b8aee3 | 557 | { "reserved", CTLTYPE_INT}, /* was rfc1644 */ \ |
984263bc MD |
558 | { "mssdflt", CTLTYPE_INT }, \ |
559 | { "stats", CTLTYPE_STRUCT }, \ | |
560 | { "rttdflt", CTLTYPE_INT }, \ | |
561 | { "keepidle", CTLTYPE_INT }, \ | |
562 | { "keepintvl", CTLTYPE_INT }, \ | |
563 | { "sendspace", CTLTYPE_INT }, \ | |
564 | { "recvspace", CTLTYPE_INT }, \ | |
565 | { "keepinit", CTLTYPE_INT }, \ | |
566 | { "pcblist", CTLTYPE_STRUCT }, \ | |
567 | { "delacktime", CTLTYPE_INT }, \ | |
568 | { "v6mssdflt", CTLTYPE_INT }, \ | |
569 | } | |
570 | ||
984263bc MD |
571 | #ifdef _KERNEL |
572 | #ifdef SYSCTL_DECL | |
573 | SYSCTL_DECL(_net_inet_tcp); | |
574 | #endif | |
575 | ||
91489f6b | 576 | #define TCP_DO_SACK(tp) ((tp)->t_flags & TF_SACK_PERMITTED) |
3a5d999b SZ |
577 | #define TCP_SACK_BLKEND(len, thflags) \ |
578 | ((len) + (((thflags) & TH_FIN) != 0)) | |
91489f6b | 579 | |
2b1ce38a MD |
580 | TAILQ_HEAD(tcpcbackqhead,tcpcb); |
581 | ||
d371a63a | 582 | extern struct inpcbinfo tcbinfo[]; |
2b1ce38a MD |
583 | extern struct tcpcbackqhead tcpcbackq[]; |
584 | ||
984263bc | 585 | extern int tcp_mssdflt; /* XXX */ |
5b0b9fa5 | 586 | extern int tcp_minmss; |
984263bc | 587 | extern int tcp_delack_enabled; |
984263bc | 588 | extern int path_mtu_discovery; |
984263bc | 589 | |
002c1265 MD |
590 | union netmsg; |
591 | ||
d371a63a JH |
592 | int tcp_addrcpu(in_addr_t faddr, in_port_t fport, |
593 | in_addr_t laddr, in_port_t lport); | |
7fe56515 JH |
594 | struct lwkt_port * |
595 | tcp_addrport(in_addr_t faddr, in_port_t fport, | |
596 | in_addr_t laddr, in_port_t lport); | |
65f3e756 | 597 | struct lwkt_port *tcp_addrport0(void); |
42a7fc75 | 598 | void tcp_canceltimers (struct tcpcb *); |
984263bc | 599 | struct tcpcb * |
42a7fc75 | 600 | tcp_close (struct tcpcb *); |
002c1265 MD |
601 | void tcp_ctlinput(union netmsg *); |
602 | void tcp_ctloutput(union netmsg *); | |
984263bc | 603 | struct tcpcb * |
42a7fc75 RG |
604 | tcp_drop (struct tcpcb *, int); |
605 | void tcp_drain (void); | |
606 | void tcp_fasttimo (void); | |
42a7fc75 | 607 | void tcp_init (void); |
bf82f9b7 | 608 | void tcp_thread_init (void); |
002c1265 | 609 | int tcp_input (struct mbuf **, int *, int); |
42a7fc75 RG |
610 | void tcp_mss (struct tcpcb *, int); |
611 | int tcp_mssopt (struct tcpcb *); | |
612 | void tcp_drop_syn_sent (struct inpcb *, int); | |
613 | void tcp_mtudisc (struct inpcb *, int); | |
984263bc | 614 | struct tcpcb * |
42a7fc75 RG |
615 | tcp_newtcpcb (struct inpcb *); |
616 | int tcp_output (struct tcpcb *); | |
617 | void tcp_quench (struct inpcb *, int); | |
618 | void tcp_respond (struct tcpcb *, void *, | |
619 | struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); | |
984263bc | 620 | struct rtentry * |
42a7fc75 | 621 | tcp_rtlookup (struct in_conninfo *); |
9a5b142f | 622 | int tcp_sack_bytes_below(struct scoreboard *scb, tcp_seq seq); |
91489f6b | 623 | void tcp_sack_cleanup(struct scoreboard *scb); |
d58ca578 | 624 | void tcp_sack_report_cleanup(struct tcpcb *tp); |
91489f6b JH |
625 | int tcp_sack_ndsack_blocks(struct raw_sackblock *blocks, |
626 | const int numblocks, tcp_seq snd_una); | |
627 | void tcp_sack_fill_report(struct tcpcb *tp, u_char *opt, u_int *plen); | |
628 | boolean_t | |
629 | tcp_sack_has_sacked(struct scoreboard *scb, u_int amount); | |
91489f6b JH |
630 | void tcp_sack_tcpcb_init(struct tcpcb *tp); |
631 | uint32_t tcp_sack_compute_pipe(struct tcpcb *tp); | |
632 | boolean_t | |
633 | tcp_sack_nextseg(struct tcpcb *tp, tcp_seq *nextrexmt, uint32_t *len, | |
634 | boolean_t *losdup); | |
635 | #ifdef later | |
636 | void tcp_sack_revert_scoreboard(struct scoreboard *scb, tcp_seq snd_una, | |
637 | u_int maxseg); | |
638 | void tcp_sack_save_scoreboard(struct scoreboard *scb); | |
639 | #endif | |
640 | void tcp_sack_skip_sacked(struct scoreboard *scb, tcp_seq *prexmt); | |
641 | void tcp_sack_update_scoreboard(struct tcpcb *tp, struct tcpopt *to); | |
efd4b327 | 642 | void tcp_save_congestion_state(struct tcpcb *tp); |
bfdb979e | 643 | void tcp_revert_congestion_state(struct tcpcb *tp); |
42a7fc75 | 644 | void tcp_setpersist (struct tcpcb *); |
dd2b0fb4 MD |
645 | struct tcptemp *tcp_maketemplate (struct tcpcb *); |
646 | void tcp_freetemplate (struct tcptemp *); | |
42a7fc75 | 647 | void tcp_fillheaders (struct tcpcb *, void *, void *); |
bf82f9b7 | 648 | struct lwkt_port * |
48e7b118 | 649 | tcp_soport(struct socket *, struct sockaddr *, struct mbuf **); |
e3873585 SZ |
650 | struct lwkt_port * |
651 | tcp_ctlport(int, struct sockaddr *, void *); | |
984263bc | 652 | struct tcpcb * |
42a7fc75 | 653 | tcp_timers (struct tcpcb *, int); |
f3f70f0d | 654 | void tcp_trace (short, short, struct tcpcb *, void *, struct tcphdr *, |
42a7fc75 | 655 | int); |
984263bc | 656 | void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); |
0ecd93f9 | 657 | void tcp_timer_keep_activity(struct tcpcb *tp, int thflags); |
984263bc MD |
658 | void syncache_init(void); |
659 | void syncache_unreach(struct in_conninfo *, struct tcphdr *); | |
660 | int syncache_expand(struct in_conninfo *, struct tcphdr *, | |
661 | struct socket **, struct mbuf *); | |
662 | int syncache_add(struct in_conninfo *, struct tcpopt *, | |
b09567cc | 663 | struct tcphdr *, struct socket *, struct mbuf *); |
984263bc MD |
664 | void syncache_chkrst(struct in_conninfo *, struct tcphdr *); |
665 | void syncache_badack(struct in_conninfo *); | |
e5fe3477 MD |
666 | void syncache_destroy(struct tcpcb *tp); |
667 | ||
b1992928 MD |
668 | #ifdef TCP_SIGNATURE |
669 | int tcpsignature_apply(void *fstate, void *data, unsigned int len); | |
670 | int tcpsignature_compute(struct mbuf *m, int len, int tcpoptlen, | |
671 | u_char *buf, u_int direction); | |
672 | #endif /* TCP_SIGNATURE */ | |
984263bc MD |
673 | |
674 | extern struct pr_usrreqs tcp_usrreqs; | |
675 | extern u_long tcp_sendspace; | |
676 | extern u_long tcp_recvspace; | |
42a7fc75 | 677 | tcp_seq tcp_new_isn (struct tcpcb *); |
984263bc MD |
678 | |
679 | #endif /* _KERNEL */ | |
680 | ||
681 | #endif /* _NETINET_TCP_VAR_H_ */ |